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Greg Kroah-Hartmanb2441312017-11-01 15:07:57 +01001# SPDX-License-Identifier: GPL-2.0
Sam Ravnborgdaa93fa2007-11-12 20:54:30 +01002# Select 32 or 64 bit
3config 64BIT
Masahiro Yamada104daea2018-05-28 18:21:40 +09004 bool "64-bit kernel" if "$(ARCH)" = "x86"
5 default "$(ARCH)" != "i386"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01006 ---help---
Sam Ravnborgdaa93fa2007-11-12 20:54:30 +01007 Say yes to build a 64-bit kernel - formerly known as x86_64
8 Say no to build a 32-bit kernel - formerly known as i386
9
10config X86_32
Jan Beulich3120e252012-09-10 12:41:45 +010011 def_bool y
12 depends on !64BIT
Ingo Molnar341c7872016-11-15 10:04:55 +010013 # Options that are inherently 32-bit kernel only:
14 select ARCH_WANT_IPC_PARSE_VERSION
15 select CLKSRC_I8253
16 select CLONE_BACKWARDS
Ingo Molnar341c7872016-11-15 10:04:55 +010017 select MODULES_USE_ELF_REL
18 select OLD_SIGACTION
Sam Ravnborgdaa93fa2007-11-12 20:54:30 +010019
20config X86_64
Jan Beulich3120e252012-09-10 12:41:45 +010021 def_bool y
22 depends on 64BIT
Ingo Molnard94e0682016-11-15 10:11:57 +010023 # Options that are inherently 64-bit kernel only:
Aneesh Kumar K.Ve1073d12017-07-06 15:39:17 -070024 select ARCH_HAS_GIGANTIC_PAGE if (MEMORY_ISOLATION && COMPACTION) || CMA
Ingo Molnard94e0682016-11-15 10:11:57 +010025 select ARCH_SUPPORTS_INT128
26 select ARCH_USE_CMPXCHG_LOCKREF
27 select HAVE_ARCH_SOFT_DIRTY
28 select MODULES_USE_ELF_RELA
Christoph Hellwigf616ab52018-05-09 06:53:49 +020029 select NEED_DMA_MAP_STATE
Christoph Hellwig09230cb2018-04-24 09:00:54 +020030 select SWIOTLB
Ingo Molnard94e0682016-11-15 10:11:57 +010031 select X86_DEV_DMA_OPS
Dominik Brodowskif8781c42018-04-05 11:53:05 +020032 select ARCH_HAS_SYSCALL_WRAPPER
Sam Ravnborg1032c0b2007-11-06 21:35:08 +010033
Ingo Molnard94e0682016-11-15 10:11:57 +010034#
35# Arch settings
36#
37# ( Note that options that are marked 'if X86_64' could in principle be
38# ported to 32-bit as well. )
39#
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010040config X86
Harvey Harrison3c2362e2008-01-30 13:31:03 +010041 def_bool y
Ingo Molnarc763ea22016-11-15 10:26:39 +010042 #
43 # Note: keep this list sorted alphabetically
44 #
Ingo Molnar6471b822015-06-03 10:00:13 +020045 select ACPI_LEGACY_TABLES_LOOKUP if ACPI
46 select ACPI_SYSTEM_POWER_STATES_SUPPORT if ACPI
47 select ANON_INODES
Yury Norov942fa982018-05-16 11:18:49 +030048 select ARCH_32BIT_OFF_T if X86_32
Ingo Molnar6471b822015-06-03 10:00:13 +020049 select ARCH_CLOCKSOURCE_DATA
Thomas Gleixner2a21ad52018-09-17 14:45:35 +020050 select ARCH_CLOCKSOURCE_INIT
Ingo Molnar6471b822015-06-03 10:00:13 +020051 select ARCH_DISCARD_MEMBLOCK
Ingo Molnarc763ea22016-11-15 10:26:39 +010052 select ARCH_HAS_ACPI_TABLE_UPGRADE if ACPI
Laura Abbottfa5b6ec2017-01-10 13:35:40 -080053 select ARCH_HAS_DEBUG_VIRTUAL
Dan Williams21266be2015-11-19 18:19:29 -080054 select ARCH_HAS_DEVMEM_IS_ALLOWED
Ingo Molnar6471b822015-06-03 10:00:13 +020055 select ARCH_HAS_ELF_RANDOMIZE
Linus Torvalds72d93102014-09-13 11:14:53 -070056 select ARCH_HAS_FAST_MULTIPLIER
Dave Hansen316d0972018-04-20 15:20:28 -070057 select ARCH_HAS_FILTER_PGPROT
Daniel Micay6974f0c2017-07-12 14:36:10 -070058 select ARCH_HAS_FORTIFY_SOURCE
Riku Voipio957e3fa2014-12-12 16:57:44 -080059 select ARCH_HAS_GCOV_PROFILE_ALL
Dmitry Vyukov5c9a8752016-03-22 14:27:30 -070060 select ARCH_HAS_KCOV if X86_64
Mathieu Desnoyers10bcc802018-01-29 15:20:18 -050061 select ARCH_HAS_MEMBARRIER_SYNC_CORE
Ingo Molnarc763ea22016-11-15 10:26:39 +010062 select ARCH_HAS_PMEM_API if X86_64
Laurent Dufour3010a5e2018-06-07 17:06:08 -070063 select ARCH_HAS_PTE_SPECIAL
Kees Cook39208aa2017-09-02 13:09:46 -070064 select ARCH_HAS_REFCOUNT
Dan Williams0aed55a2017-05-29 12:22:50 -070065 select ARCH_HAS_UACCESS_FLUSHCACHE if X86_64
Dan Williams092b31a2018-07-08 13:46:17 -070066 select ARCH_HAS_UACCESS_MCSAFE if X86_64 && X86_MCE
Daniel Borkmannd2852a22017-02-21 16:09:33 +010067 select ARCH_HAS_SET_MEMORY
Laura Abbottad21fc42017-02-06 16:31:57 -080068 select ARCH_HAS_STRICT_KERNEL_RWX
69 select ARCH_HAS_STRICT_MODULE_RWX
Mathieu Desnoyersac1ab122018-01-29 15:20:16 -050070 select ARCH_HAS_SYNC_CORE_BEFORE_USERMODE
Andrey Ryabininc6d30852016-01-20 15:00:55 -080071 select ARCH_HAS_UBSAN_SANITIZE_ALL
Oliver O'Halloran65f7d042017-06-28 11:32:31 +100072 select ARCH_HAS_ZONE_DEVICE if X86_64
Ingo Molnar6471b822015-06-03 10:00:13 +020073 select ARCH_HAVE_NMI_SAFE_CMPXCHG
74 select ARCH_MIGHT_HAVE_ACPI_PDC if ACPI
Mark Salter77fbbc82013-10-07 22:18:07 -040075 select ARCH_MIGHT_HAVE_PC_PARPORT
Mark Salter5e2c18c2014-01-01 11:34:16 -080076 select ARCH_MIGHT_HAVE_PC_SERIO
Arnd Bergmann2c870e62018-07-24 11:48:45 +020077 select ARCH_SUPPORTS_ACPI
Ingo Molnar6471b822015-06-03 10:00:13 +020078 select ARCH_SUPPORTS_ATOMIC_RMW
Ingo Molnar6471b822015-06-03 10:00:13 +020079 select ARCH_SUPPORTS_NUMA_BALANCING if X86_64
80 select ARCH_USE_BUILTIN_BSWAP
Ingo Molnar6471b822015-06-03 10:00:13 +020081 select ARCH_USE_QUEUED_RWLOCKS
82 select ARCH_USE_QUEUED_SPINLOCKS
Andy Lutomirskice4a4e562017-05-28 10:00:14 -070083 select ARCH_WANT_BATCHED_UNMAP_TLB_FLUSH
Ingo Molnarc763ea22016-11-15 10:26:39 +010084 select ARCH_WANTS_DYNAMIC_TASK_STRUCT
Huang Ying38d8b4e2017-07-06 15:37:18 -070085 select ARCH_WANTS_THP_SWAP if X86_64
Ingo Molnar6471b822015-06-03 10:00:13 +020086 select BUILDTIME_EXTABLE_SORT
87 select CLKEVT_I8253
Ingo Molnar6471b822015-06-03 10:00:13 +020088 select CLOCKSOURCE_VALIDATE_LAST_CYCLE
89 select CLOCKSOURCE_WATCHDOG
Ingo Molnar6471b822015-06-03 10:00:13 +020090 select DCACHE_WORD_ACCESS
Linus Torvalds45471cd2015-06-24 19:52:06 -070091 select EDAC_ATOMIC_SCRUB
92 select EDAC_SUPPORT
Ingo Molnar6471b822015-06-03 10:00:13 +020093 select GENERIC_CLOCKEVENTS
94 select GENERIC_CLOCKEVENTS_BROADCAST if X86_64 || (X86_32 && X86_LOCAL_APIC)
95 select GENERIC_CLOCKEVENTS_MIN_ADJUST
96 select GENERIC_CMOS_UPDATE
97 select GENERIC_CPU_AUTOPROBE
Thomas Gleixner61dc0f52018-01-07 22:48:01 +010098 select GENERIC_CPU_VULNERABILITIES
Ingo Molnar6471b822015-06-03 10:00:13 +020099 select GENERIC_EARLY_IOREMAP
100 select GENERIC_FIND_FIRST_BIT
101 select GENERIC_IOMAP
Thomas Gleixnerc7d6c9d2017-06-20 01:37:46 +0200102 select GENERIC_IRQ_EFFECTIVE_AFF_MASK if SMP
Thomas Gleixner0fa115d2017-09-13 23:29:38 +0200103 select GENERIC_IRQ_MATRIX_ALLOCATOR if X86_LOCAL_APIC
Thomas Gleixnerad7a9292017-06-20 01:37:33 +0200104 select GENERIC_IRQ_MIGRATION if SMP
Ingo Molnar6471b822015-06-03 10:00:13 +0200105 select GENERIC_IRQ_PROBE
Thomas Gleixnerc201c912017-10-17 09:54:59 +0200106 select GENERIC_IRQ_RESERVATION_MODE
Ingo Molnar6471b822015-06-03 10:00:13 +0200107 select GENERIC_IRQ_SHOW
108 select GENERIC_PENDING_IRQ if SMP
109 select GENERIC_SMP_IDLE_THREAD
110 select GENERIC_STRNCPY_FROM_USER
111 select GENERIC_STRNLEN_USER
112 select GENERIC_TIME_VSYSCALL
Thomas Gleixner7edaeb62017-08-15 09:50:13 +0200113 select HARDLOCKUP_CHECK_TIMESTAMP if X86_64
Ingo Molnar6471b822015-06-03 10:00:13 +0200114 select HAVE_ACPI_APEI if ACPI
115 select HAVE_ACPI_APEI_NMI if ACPI
116 select HAVE_ALIGNED_STRUCT_PAGE if SLUB
Ingo Molnar6471b822015-06-03 10:00:13 +0200117 select HAVE_ARCH_AUDITSYSCALL
118 select HAVE_ARCH_HUGE_VMAP if X86_64 || X86_PAE
119 select HAVE_ARCH_JUMP_LABEL
Ard Biesheuvelb34006c2018-09-18 23:51:41 -0700120 select HAVE_ARCH_JUMP_LABEL_RELATIVE
Andrey Ryabinind17a1d92017-11-15 17:36:35 -0800121 select HAVE_ARCH_KASAN if X86_64
Ingo Molnar6471b822015-06-03 10:00:13 +0200122 select HAVE_ARCH_KGDB
Daniel Cashman9e08f572016-01-14 15:20:06 -0800123 select HAVE_ARCH_MMAP_RND_BITS if MMU
124 select HAVE_ARCH_MMAP_RND_COMPAT_BITS if MMU && COMPAT
Dmitry Safonov1b028f72017-03-06 17:17:19 +0300125 select HAVE_ARCH_COMPAT_MMAP_BASES if MMU && COMPAT
Ard Biesheuvel271ca782018-08-21 21:56:00 -0700126 select HAVE_ARCH_PREL32_RELOCATIONS
Ingo Molnar6471b822015-06-03 10:00:13 +0200127 select HAVE_ARCH_SECCOMP_FILTER
Kees Cookf7d83c12017-08-16 13:26:03 -0700128 select HAVE_ARCH_THREAD_STRUCT_WHITELIST
Alexander Popovafaef012018-08-17 01:16:58 +0300129 select HAVE_ARCH_STACKLEAK
Ingo Molnar6471b822015-06-03 10:00:13 +0200130 select HAVE_ARCH_TRACEHOOK
131 select HAVE_ARCH_TRANSPARENT_HUGEPAGE
Matthew Wilcoxa00cc7d2017-02-24 14:57:02 -0800132 select HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD if X86_64
Andy Lutomirskie37e43a2016-08-11 02:35:23 -0700133 select HAVE_ARCH_VMAP_STACK if X86_64
Ingo Molnarc763ea22016-11-15 10:26:39 +0100134 select HAVE_ARCH_WITHIN_STACK_FRAMES
Ingo Molnar6471b822015-06-03 10:00:13 +0200135 select HAVE_CMPXCHG_DOUBLE
136 select HAVE_CMPXCHG_LOCAL
137 select HAVE_CONTEXT_TRACKING if X86_64
Josh Triplettc1bd55f2015-06-30 15:00:00 -0700138 select HAVE_COPY_THREAD_TLS
Ingo Molnar6471b822015-06-03 10:00:13 +0200139 select HAVE_C_RECORDMCOUNT
140 select HAVE_DEBUG_KMEMLEAK
141 select HAVE_DEBUG_STACKOVERFLOW
Akinobu Mita9c5a3622014-06-04 16:06:50 -0700142 select HAVE_DMA_CONTIGUOUS
Steven Rostedt677aa9f2008-05-17 00:01:36 -0400143 select HAVE_DYNAMIC_FTRACE
Masami Hiramatsu06aeaae2012-09-28 17:15:17 +0900144 select HAVE_DYNAMIC_FTRACE_WITH_REGS
Wang YanQing03f57812018-05-03 14:10:43 +0800145 select HAVE_EBPF_JIT
Johannes Berg58340a02008-07-25 01:45:33 -0700146 select HAVE_EFFICIENT_UNALIGNED_ACCESS
Christoph Hellwig6630a8e2018-11-15 20:05:37 +0100147 select HAVE_EISA
Jiri Slaby5f56a5d2016-05-20 17:00:16 -0700148 select HAVE_EXIT_THREAD
Steven Rostedt (VMware)644e0e82017-03-23 10:33:52 -0400149 select HAVE_FENTRY if X86_64 || DYNAMIC_FTRACE
Ingo Molnar6471b822015-06-03 10:00:13 +0200150 select HAVE_FTRACE_MCOUNT_RECORD
Ingo Molnar6471b822015-06-03 10:00:13 +0200151 select HAVE_FUNCTION_GRAPH_TRACER
152 select HAVE_FUNCTION_TRACER
Emese Revfy6b90bd42016-05-24 00:09:38 +0200153 select HAVE_GCC_PLUGINS
K.Prasad0067f122009-06-01 23:43:57 +0530154 select HAVE_HW_BREAKPOINT
Ingo Molnar6471b822015-06-03 10:00:13 +0200155 select HAVE_IDE
156 select HAVE_IOREMAP_PROT
157 select HAVE_IRQ_EXIT_ON_IRQ_STACK if X86_64
158 select HAVE_IRQ_TIME_ACCOUNTING
159 select HAVE_KERNEL_BZIP2
160 select HAVE_KERNEL_GZIP
161 select HAVE_KERNEL_LZ4
162 select HAVE_KERNEL_LZMA
163 select HAVE_KERNEL_LZO
164 select HAVE_KERNEL_XZ
165 select HAVE_KPROBES
166 select HAVE_KPROBES_ON_FTRACE
Masami Hiramatsu540adea2018-01-13 02:55:03 +0900167 select HAVE_FUNCTION_ERROR_INJECTION
Ingo Molnar6471b822015-06-03 10:00:13 +0200168 select HAVE_KRETPROBES
169 select HAVE_KVM
170 select HAVE_LIVEPATCH if X86_64
Ingo Molnar6471b822015-06-03 10:00:13 +0200171 select HAVE_MEMBLOCK_NODE_MAP
Frederic Weisbecker01027522010-04-11 18:55:56 +0200172 select HAVE_MIXED_BREAKPOINTS_REGS
Josh Poimboeufee9f8fc2017-07-24 18:36:57 -0500173 select HAVE_MOD_ARCH_SPECIFIC
Joel Fernandes (Google)9f132f72019-01-03 15:28:41 -0800174 select HAVE_MOVE_PMD
Petr Mladek42a0bb32016-05-20 17:00:33 -0700175 select HAVE_NMI
Ingo Molnar6471b822015-06-03 10:00:13 +0200176 select HAVE_OPROFILE
177 select HAVE_OPTPROBES
178 select HAVE_PCSPKR_PLATFORM
179 select HAVE_PERF_EVENTS
Frederic Weisbeckerc01d4322010-05-15 22:57:48 +0200180 select HAVE_PERF_EVENTS_NMI
Nicholas Piggin92e5aae2017-08-18 15:15:51 -0700181 select HAVE_HARDLOCKUP_DETECTOR_PERF if PERF_EVENTS && HAVE_PERF_EVENTS_NMI
Christoph Hellwigeb01d422018-11-15 20:05:32 +0100182 select HAVE_PCI
Jiri Olsac5e63192012-08-07 15:20:36 +0200183 select HAVE_PERF_REGS
Jiri Olsac5ebced2012-08-07 15:20:40 +0200184 select HAVE_PERF_USER_STACK_DUMP
Peter Zijlstra48a8b972018-08-22 17:30:16 +0200185 select HAVE_RCU_TABLE_FREE if PARAVIRT
Peter Zijlstrad86564a2018-08-22 17:30:15 +0200186 select HAVE_RCU_TABLE_INVALIDATE if HAVE_RCU_TABLE_FREE
Ingo Molnar6471b822015-06-03 10:00:13 +0200187 select HAVE_REGS_AND_STACK_ACCESS_API
Jiri Slaby6415b382018-05-18 08:47:13 +0200188 select HAVE_RELIABLE_STACKTRACE if X86_64 && (UNWINDER_FRAME_POINTER || UNWINDER_ORC) && STACK_VALIDATION
Masami Hiramatsu3c88ee194c2018-04-25 21:20:57 +0900189 select HAVE_FUNCTION_ARG_ACCESS_API
Masahiro Yamadad148eac2018-06-14 19:36:45 +0900190 select HAVE_STACKPROTECTOR if CC_HAS_SANE_STACKPROTECTOR
Ingo Molnarc763ea22016-11-15 10:26:39 +0100191 select HAVE_STACK_VALIDATION if X86_64
Mathieu Desnoyersd6761b82018-06-02 08:43:58 -0400192 select HAVE_RSEQ
Ingo Molnar6471b822015-06-03 10:00:13 +0200193 select HAVE_SYSCALL_TRACEPOINTS
Ingo Molnar6471b822015-06-03 10:00:13 +0200194 select HAVE_UNSTABLE_SCHED_CLOCK
Avi Kivity7c68af62009-09-19 09:40:22 +0300195 select HAVE_USER_RETURN_NOTIFIER
Thomas Gleixner05736e42018-05-29 17:48:27 +0200196 select HOTPLUG_SMT if SMP
Thomas Gleixnerc01858082011-02-07 02:24:08 +0100197 select IRQ_FORCED_THREADING
Christoph Hellwig86596f02018-04-05 09:44:52 +0200198 select NEED_SG_DMA_LENGTH
Christoph Hellwig2eac9c22018-11-15 20:05:33 +0100199 select PCI_DOMAINS if PCI
Sinan Kaya625210c2019-01-21 23:19:58 +0000200 select PCI_LOCKLESS_CONFIG if PCI
Ingo Molnar6471b822015-06-03 10:00:13 +0200201 select PERF_EVENTS
Prarit Bhargava3195ef52013-02-14 12:02:54 -0500202 select RTC_LIB
Arnd Bergmannd6faca42016-06-01 16:46:23 +0200203 select RTC_MC146818_LIB
Ingo Molnar6471b822015-06-03 10:00:13 +0200204 select SPARSE_IRQ
Pranith Kumar83fe27e2014-12-05 11:24:45 -0500205 select SRCU
Ingo Molnar6471b822015-06-03 10:00:13 +0200206 select SYSCTL_EXCEPTION_TRACE
Andy Lutomirski15f4eae2016-09-13 14:29:25 -0700207 select THREAD_INFO_IN_TASK
Ingo Molnar6471b822015-06-03 10:00:13 +0200208 select USER_STACKTRACE_SUPPORT
209 select VIRT_TO_BUS
Ingo Molnar6471b822015-06-03 10:00:13 +0200210 select X86_FEATURE_NAMES if PROC_FS
Balbir Singh7d8330a2008-02-10 12:46:28 +0530211
Ingo Molnarba7e4d12009-06-06 13:58:12 +0200212config INSTRUCTION_DECODER
Jan Beulich3120e252012-09-10 12:41:45 +0100213 def_bool y
214 depends on KPROBES || PERF_EVENTS || UPROBES
Ingo Molnarba7e4d12009-06-06 13:58:12 +0200215
Linus Torvalds51b26ad2009-04-26 10:12:47 -0700216config OUTPUT_FORMAT
217 string
218 default "elf32-i386" if X86_32
219 default "elf64-x86-64" if X86_64
220
Sam Ravnborg73531902008-05-25 23:03:18 +0200221config ARCH_DEFCONFIG
Sam Ravnborgb9b39bfb2008-04-29 12:48:15 +0200222 string
Sam Ravnborg73531902008-05-25 23:03:18 +0200223 default "arch/x86/configs/i386_defconfig" if X86_32
224 default "arch/x86/configs/x86_64_defconfig" if X86_64
Sam Ravnborgb9b39bfb2008-04-29 12:48:15 +0200225
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100226config LOCKDEP_SUPPORT
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100227 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100228
229config STACKTRACE_SUPPORT
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100230 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100231
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100232config MMU
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100233 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100234
Daniel Cashman9e08f572016-01-14 15:20:06 -0800235config ARCH_MMAP_RND_BITS_MIN
236 default 28 if 64BIT
237 default 8
238
239config ARCH_MMAP_RND_BITS_MAX
240 default 32 if 64BIT
241 default 16
242
243config ARCH_MMAP_RND_COMPAT_BITS_MIN
244 default 8
245
246config ARCH_MMAP_RND_COMPAT_BITS_MAX
247 default 16
248
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100249config SBUS
250 bool
251
252config GENERIC_ISA_DMA
Jan Beulich3120e252012-09-10 12:41:45 +0100253 def_bool y
254 depends on ISA_DMA_API
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100255
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100256config GENERIC_BUG
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100257 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100258 depends on BUG
Jan Beulichb93a5312008-12-16 11:40:27 +0000259 select GENERIC_BUG_RELATIVE_POINTERS if X86_64
260
261config GENERIC_BUG_RELATIVE_POINTERS
262 bool
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100263
264config GENERIC_HWEIGHT
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100265 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100266
267config ARCH_MAY_HAVE_PC_FDC
Jan Beulich3120e252012-09-10 12:41:45 +0100268 def_bool y
269 depends on ISA_DMA_API
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100270
Sam Ravnborg1032c0b2007-11-06 21:35:08 +0100271config RWSEM_XCHGADD_ALGORITHM
Jan Beulich3120e252012-09-10 12:41:45 +0100272 def_bool y
Sam Ravnborg1032c0b2007-11-06 21:35:08 +0100273
Sam Ravnborg1032c0b2007-11-06 21:35:08 +0100274config GENERIC_CALIBRATE_DELAY
275 def_bool y
276
venkatesh.pallipadi@intel.com9a0b8412008-01-31 17:35:06 -0800277config ARCH_HAS_CPU_RELAX
278 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100279
Pekka Enberg1b27d052008-04-28 02:12:22 -0700280config ARCH_HAS_CACHE_LINE_SIZE
281 def_bool y
282
Dave Hansen316d0972018-04-20 15:20:28 -0700283config ARCH_HAS_FILTER_PGPROT
284 def_bool y
285
Mike Travisdd5af902008-01-30 13:33:32 +0100286config HAVE_SETUP_PER_CPU_AREA
Brian Gerst89c9c4c2009-01-27 12:56:48 +0900287 def_bool y
travis@sgi.comb32ef632008-01-30 13:32:51 +0100288
Tejun Heo08fc4582009-08-14 15:00:49 +0900289config NEED_PER_CPU_EMBED_FIRST_CHUNK
290 def_bool y
291
292config NEED_PER_CPU_PAGE_FIRST_CHUNK
Tejun Heo11124412009-02-20 16:29:09 +0900293 def_bool y
294
Johannes Berg801e4062007-12-08 02:12:39 +0100295config ARCH_HIBERNATION_POSSIBLE
296 def_bool y
Johannes Berg801e4062007-12-08 02:12:39 +0100297
Johannes Bergf4cb5702007-12-08 02:14:00 +0100298config ARCH_SUSPEND_POSSIBLE
299 def_bool y
Johannes Bergf4cb5702007-12-08 02:14:00 +0100300
Steve Cappercfe28c52013-04-29 14:29:48 +0100301config ARCH_WANT_HUGE_PMD_SHARE
302 def_bool y
303
Steve Capper53313b22013-04-30 08:03:42 +0100304config ARCH_WANT_GENERAL_HUGETLB
305 def_bool y
306
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100307config ZONE_DMA32
Jan Beuliche0fd24a2015-02-05 15:39:34 +0000308 def_bool y if X86_64
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100309
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100310config AUDIT_ARCH
Jan Beuliche0fd24a2015-02-05 15:39:34 +0000311 def_bool y if X86_64
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100312
Ingo Molnar765c68b2008-04-09 11:03:37 +0200313config ARCH_SUPPORTS_OPTIMIZED_INLINING
314 def_bool y
315
Akinobu Mita6a11f752009-03-31 15:23:17 -0700316config ARCH_SUPPORTS_DEBUG_PAGEALLOC
317 def_bool y
318
Andrey Ryabinind6f2d752015-07-02 12:09:38 +0300319config KASAN_SHADOW_OFFSET
320 hex
321 depends on KASAN
322 default 0xdffffc0000000000
323
Shane Wang69575d32009-09-01 18:25:07 -0700324config HAVE_INTEL_TXT
325 def_bool y
Kees Cook6ea30382012-10-02 11:16:47 -0700326 depends on INTEL_IOMMU && ACPI
Shane Wang69575d32009-09-01 18:25:07 -0700327
Sam Ravnborg6b0c3d42008-01-30 13:32:27 +0100328config X86_32_SMP
329 def_bool y
330 depends on X86_32 && SMP
331
332config X86_64_SMP
333 def_bool y
334 depends on X86_64 && SMP
335
Tejun Heoccbeed32009-02-09 22:17:40 +0900336config X86_32_LAZY_GS
337 def_bool y
Masahiro Yamada8458f8c2018-06-14 19:36:43 +0900338 depends on X86_32 && !STACKPROTECTOR
Tejun Heoccbeed32009-02-09 22:17:40 +0900339
Srikar Dronamraju2b144492012-02-09 14:56:42 +0530340config ARCH_SUPPORTS_UPROBES
341 def_bool y
342
Rob Herringd20642f2014-04-18 17:19:54 -0500343config FIX_EARLYCON_MEM
344 def_bool y
345
Kirill A. Shutemov94d49eb2018-05-18 14:30:28 +0300346config DYNAMIC_PHYSICAL_MASK
347 bool
348
Kirill A. Shutemov98233362015-04-14 15:46:14 -0700349config PGTABLE_LEVELS
350 int
Kirill A. Shutemov77ef56e2017-07-17 01:59:54 +0300351 default 5 if X86_5LEVEL
Kirill A. Shutemov98233362015-04-14 15:46:14 -0700352 default 4 if X86_64
353 default 3 if X86_PAE
354 default 2
355
Masahiro Yamada2a61f472018-05-28 18:22:00 +0900356config CC_HAS_SANE_STACKPROTECTOR
357 bool
358 default $(success,$(srctree)/scripts/gcc-x86_64-has-stack-protector.sh $(CC)) if 64BIT
359 default $(success,$(srctree)/scripts/gcc-x86_32-has-stack-protector.sh $(CC))
360 help
361 We have to make sure stack protector is unconditionally disabled if
362 the compiler produces broken code.
363
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100364menu "Processor type and features"
365
Randy Dunlap5ee71532012-01-16 11:57:18 -0800366config ZONE_DMA
367 bool "DMA memory allocation support" if EXPERT
368 default y
369 help
370 DMA memory allocation support allows devices with less than 32-bit
371 addressing to allocate within the first 16MB of address space.
372 Disable if no such devices will be used.
373
374 If unsure, say Y.
375
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100376config SMP
377 bool "Symmetric multi-processing support"
378 ---help---
379 This enables support for systems with more than one CPU. If you have
Robert Graffham4a474152014-01-23 15:55:29 -0800380 a system with only one CPU, say N. If you have a system with more
381 than one CPU, say Y.
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100382
Robert Graffham4a474152014-01-23 15:55:29 -0800383 If you say N here, the kernel will run on uni- and multiprocessor
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100384 machines, but will use only one CPU of a multiprocessor machine. If
385 you say Y here, the kernel will run on many, but not all,
Robert Graffham4a474152014-01-23 15:55:29 -0800386 uniprocessor machines. On a uniprocessor machine, the kernel
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100387 will run faster if you say N here.
388
389 Note that if you say Y here and choose architecture "586" or
390 "Pentium" under "Processor family", the kernel will not work on 486
391 architectures. Similarly, multiprocessor kernels for the "PPro"
392 architecture may not work on all Pentium based boards.
393
394 People using multiprocessor machines who say Y here should also say
395 Y to "Enhanced Real Time Clock Support", below. The "Advanced Power
396 Management" code will be disabled if you say Y here.
397
Paul Bolle395cf962011-08-15 02:02:26 +0200398 See also <file:Documentation/x86/i386/IO-APIC.txt>,
Benjamin Petersonc9525a32017-05-20 17:20:16 -0700399 <file:Documentation/lockup-watchdogs.txt> and the SMP-HOWTO available at
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100400 <http://www.tldp.org/docs.html#howto>.
401
402 If you don't know what to do here, say N.
403
Josh Triplett9def39be2013-10-30 08:09:45 -0700404config X86_FEATURE_NAMES
405 bool "Processor feature human-readable names" if EMBEDDED
406 default y
407 ---help---
408 This option compiles in a table of x86 feature bits and corresponding
409 names. This is required to support /proc/cpuinfo and a few kernel
410 messages. You can disable this to save space, at the expense of
411 making those few kernel messages show numeric feature bits instead.
412
413 If in doubt, say Y.
414
Yinghai Lu06cd9a72009-02-16 17:29:58 -0800415config X86_X2APIC
416 bool "Support x2apic"
Jan Kiszka19e3d602015-05-04 17:58:01 +0200417 depends on X86_LOCAL_APIC && X86_64 && (IRQ_REMAP || HYPERVISOR_GUEST)
Yinghai Lu06cd9a72009-02-16 17:29:58 -0800418 ---help---
419 This enables x2apic support on CPUs that have this feature.
420
421 This allows 32-bit apic IDs (so it can support very large systems),
422 and accesses the local apic via MSRs not via mmio.
423
Yinghai Lu06cd9a72009-02-16 17:29:58 -0800424 If you don't know what to do here, say N.
425
Yinghai Lu6695c852008-06-19 12:13:09 -0700426config X86_MPPARSE
Bin Gao6e87f9b72012-10-25 09:35:44 -0700427 bool "Enable MPS table" if ACPI || SFI
Jan Beulich7a527682008-10-30 10:38:24 +0000428 default y
Ingo Molnar5ab74722008-07-10 14:42:03 +0200429 depends on X86_LOCAL_APIC
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100430 ---help---
Yinghai Lu6695c852008-06-19 12:13:09 -0700431 For old smp systems that do not have proper acpi support. Newer systems
432 (esp with 64bit cpus) with acpi support, MADT and DSDT will override it
Yinghai Lu6695c852008-06-19 12:13:09 -0700433
Jun Nakajimaddd70cf2013-01-21 17:23:09 +0000434config GOLDFISH
435 def_bool y
436 depends on X86_GOLDFISH
437
David Woodhouse76b04382018-01-11 21:46:25 +0000438config RETPOLINE
439 bool "Avoid speculative indirect branches in kernel"
440 default y
Peter Zijlstrad5028ba2018-02-06 09:46:13 +0100441 select STACK_VALIDATION if HAVE_STACK_VALIDATION
David Woodhouse76b04382018-01-11 21:46:25 +0000442 help
443 Compile kernel with the retpoline compiler options to guard against
444 kernel-to-user data leaks by avoiding speculative indirect
445 branches. Requires a compiler with -mindirect-branch=thunk-extern
446 support for full protection. The kernel may run slower.
447
Johannes Weinere6d42932019-01-29 17:44:36 -0500448config X86_CPU_RESCTRL
449 bool "x86 CPU resource control support"
Babu Moger6fe07ce2018-11-21 20:28:39 +0000450 depends on X86 && (CPU_SUP_INTEL || CPU_SUP_AMD)
Thomas Gleixner59fe5a72016-11-15 15:17:12 +0100451 select KERNFS
Fenghua Yu78e99b42016-10-22 06:19:53 -0700452 help
Johannes Weinere6d42932019-01-29 17:44:36 -0500453 Enable x86 CPU resource control support.
Babu Moger6fe07ce2018-11-21 20:28:39 +0000454
455 Provide support for the allocation and monitoring of system resources
456 usage by the CPU.
457
458 Intel calls this Intel Resource Director Technology
459 (Intel(R) RDT). More information about RDT can be found in the
460 Intel x86 Architecture Software Developer Manual.
461
462 AMD calls this AMD Platform Quality of Service (AMD QoS).
463 More information about AMD QoS can be found in the AMD64 Technology
464 Platform Quality of Service Extensions manual.
Fenghua Yu78e99b42016-10-22 06:19:53 -0700465
466 Say N if unsure.
467
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800468if X86_32
Randy Dunlapa0d0bb42018-02-09 16:51:03 -0800469config X86_BIGSMP
470 bool "Support for big SMP systems with more than 8 CPUs"
471 depends on SMP
472 ---help---
473 This option is needed for the systems that have more than 8 CPUs
474
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800475config X86_EXTENDED_PLATFORM
476 bool "Support for extended (non-PC) x86 platforms"
477 default y
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100478 ---help---
Ingo Molnar06ac8342009-01-27 18:11:43 +0100479 If you disable this option then the kernel will only support
480 standard PC platforms. (which covers the vast majority of
481 systems out there.)
482
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800483 If you enable this option then you'll be able to select support
484 for the following (non-PC) 32 bit x86 platforms:
Ben Hutchingscb7b8022013-06-24 01:05:25 +0100485 Goldfish (Android emulator)
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800486 AMD Elan
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800487 RDC R-321x SoC
488 SGI 320/540 (Visual Workstation)
Alessandro Rubini83125a32012-04-04 19:40:21 +0200489 STA2X11-based (e.g. Northville)
Thomas Gleixner3f4110a2009-08-29 14:54:20 +0200490 Moorestown MID devices
Ingo Molnar06ac8342009-01-27 18:11:43 +0100491
492 If you have one of these systems, or if you want to build a
493 generic distribution kernel, say Y here - otherwise say N.
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800494endif
Ingo Molnar06ac8342009-01-27 18:11:43 +0100495
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800496if X86_64
497config X86_EXTENDED_PLATFORM
498 bool "Support for extended (non-PC) x86 platforms"
499 default y
500 ---help---
501 If you disable this option then the kernel will only support
502 standard PC platforms. (which covers the vast majority of
503 systems out there.)
504
505 If you enable this option then you'll be able to select support
506 for the following (non-PC) 64 bit x86 platforms:
Steffen Persvold44b111b52011-12-06 00:07:26 +0800507 Numascale NumaChip
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800508 ScaleMP vSMP
509 SGI Ultraviolet
510
511 If you have one of these systems, or if you want to build a
512 generic distribution kernel, say Y here - otherwise say N.
513endif
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800514# This is an alphabetically sorted list of 64 bit extended platforms
515# Please maintain the alphabetic order if and when there are additions
Steffen Persvold44b111b52011-12-06 00:07:26 +0800516config X86_NUMACHIP
517 bool "Numascale NumaChip"
518 depends on X86_64
519 depends on X86_EXTENDED_PLATFORM
520 depends on NUMA
521 depends on SMP
522 depends on X86_X2APIC
Daniel J Bluemanf9726bf2012-12-07 14:24:32 -0700523 depends on PCI_MMCONFIG
Steffen Persvold44b111b52011-12-06 00:07:26 +0800524 ---help---
525 Adds support for Numascale NumaChip large-SMP systems. Needed to
526 enable more than ~168 cores.
527 If you don't have one of these, you should say N here.
Nick Piggin03b48632009-01-20 04:36:04 +0100528
Ingo Molnar6a485652009-01-27 18:29:13 +0100529config X86_VSMP
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800530 bool "ScaleMP vSMP"
Borislav Petkov6276a072013-03-04 21:20:21 +0100531 select HYPERVISOR_GUEST
Ingo Molnar6a485652009-01-27 18:29:13 +0100532 select PARAVIRT
533 depends on X86_64 && PCI
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800534 depends on X86_EXTENDED_PLATFORM
Shai Fultheimead91d42012-04-16 10:39:35 +0300535 depends on SMP
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100536 ---help---
Ingo Molnar6a485652009-01-27 18:29:13 +0100537 Support for ScaleMP vSMP systems. Say 'Y' here if this kernel is
538 supposed to run on these EM64T-based machines. Only choose this option
539 if you have one of these machines.
540
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800541config X86_UV
542 bool "SGI Ultraviolet"
543 depends on X86_64
544 depends on X86_EXTENDED_PLATFORM
Jack Steiner54c28d22009-04-03 15:39:42 -0500545 depends on NUMA
Andrew Morton1ecb4ae2016-02-11 16:13:20 -0800546 depends on EFI
Suresh Siddha9d6c26e2009-04-20 13:02:31 -0700547 depends on X86_X2APIC
Ingo Molnar1222e562015-05-06 06:23:59 +0200548 depends on PCI
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800549 ---help---
550 This option is needed in order to support SGI Ultraviolet systems.
551 If you don't have one of these, you should say N here.
552
553# Following is an alphabetically sorted list of 32 bit extended platforms
554# Please maintain the alphabetic order if and when there are additions
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100555
Jun Nakajimaddd70cf2013-01-21 17:23:09 +0000556config X86_GOLDFISH
557 bool "Goldfish (Virtual Platform)"
Ben Hutchingscb7b8022013-06-24 01:05:25 +0100558 depends on X86_EXTENDED_PLATFORM
Jun Nakajimaddd70cf2013-01-21 17:23:09 +0000559 ---help---
560 Enable support for the Goldfish virtual platform used primarily
561 for Android development. Unless you are building for the Android
562 Goldfish emulator say N here.
563
Thomas Gleixnerc751e172010-11-09 12:08:04 -0800564config X86_INTEL_CE
565 bool "CE4100 TV platform"
566 depends on PCI
567 depends on PCI_GODIRECT
Jiang Liu6084a6e2014-06-09 16:19:46 +0800568 depends on X86_IO_APIC
Thomas Gleixnerc751e172010-11-09 12:08:04 -0800569 depends on X86_32
570 depends on X86_EXTENDED_PLATFORM
Dirk Brandewie37bc9f52010-11-09 12:08:08 -0800571 select X86_REBOOTFIXUPS
Sebastian Andrzej Siewiorda6b7372011-02-22 21:07:37 +0100572 select OF
573 select OF_EARLY_FLATTREE
Thomas Gleixnerc751e172010-11-09 12:08:04 -0800574 ---help---
575 Select for the Intel CE media processor (CE4100) SOC.
576 This option compiles in support for the CE4100 SOC for settop
577 boxes and media devices.
578
David Cohen4cb9b002013-12-16 17:37:26 -0800579config X86_INTEL_MID
Alan Cox43605ef2011-07-12 17:49:29 +0100580 bool "Intel MID platform support"
Alan Cox43605ef2011-07-12 17:49:29 +0100581 depends on X86_EXTENDED_PLATFORM
David Cohenedc6bc72014-01-21 10:41:39 -0800582 depends on X86_PLATFORM_DEVICES
Alan Cox1ea7c672011-11-10 13:29:14 +0000583 depends on PCI
Andy Shevchenko3fda5bb2016-01-15 22:11:07 +0200584 depends on X86_64 || (PCI_GOANY && X86_32)
Alan Cox1ea7c672011-11-10 13:29:14 +0000585 depends on X86_IO_APIC
Alan Cox7c9c3a12011-12-29 14:43:16 +0000586 select SFI
David Cohen4cb9b002013-12-16 17:37:26 -0800587 select I2C
Alan Cox7c9c3a12011-12-29 14:43:16 +0000588 select DW_APB_TIMER
Alan Cox1ea7c672011-11-10 13:29:14 +0000589 select APB_TIMER
Alan Cox1ea7c672011-11-10 13:29:14 +0000590 select INTEL_SCU_IPC
Mika Westerberg15a713d2012-01-26 17:35:05 +0000591 select MFD_INTEL_MSIC
Alan Cox1ea7c672011-11-10 13:29:14 +0000592 ---help---
David Cohen4cb9b002013-12-16 17:37:26 -0800593 Select to build a kernel capable of supporting Intel MID (Mobile
594 Internet Device) platform systems which do not have the PCI legacy
595 interfaces. If you are building for a PC class system say N here.
Alan Cox1ea7c672011-11-10 13:29:14 +0000596
David Cohen4cb9b002013-12-16 17:37:26 -0800597 Intel MID platforms are based on an Intel processor and chipset which
598 consume less power than most of the x86 derivatives.
Alan Cox43605ef2011-07-12 17:49:29 +0100599
Bryan O'Donoghue8bbc2a12015-01-30 16:29:39 +0000600config X86_INTEL_QUARK
601 bool "Intel Quark platform support"
602 depends on X86_32
603 depends on X86_EXTENDED_PLATFORM
604 depends on X86_PLATFORM_DEVICES
605 depends on X86_TSC
606 depends on PCI
607 depends on PCI_GOANY
608 depends on X86_IO_APIC
609 select IOSF_MBI
610 select INTEL_IMR
Andy Shevchenko9ab6eb52015-03-05 17:24:04 +0200611 select COMMON_CLK
Bryan O'Donoghue8bbc2a12015-01-30 16:29:39 +0000612 ---help---
613 Select to include support for Quark X1000 SoC.
614 Say Y here if you have a Quark based system such as the Arduino
615 compatible Intel Galileo.
616
Mika Westerberg3d48aab2013-01-18 13:45:59 +0000617config X86_INTEL_LPSS
618 bool "Intel Low Power Subsystem Support"
Sinan Kaya5962dd22019-01-02 18:10:37 +0000619 depends on X86 && ACPI && PCI
Mika Westerberg3d48aab2013-01-18 13:45:59 +0000620 select COMMON_CLK
Mathias Nyman0f531432013-09-13 17:02:29 +0300621 select PINCTRL
Andy Shevchenkoeebb3e82015-12-12 02:45:06 +0100622 select IOSF_MBI
Mika Westerberg3d48aab2013-01-18 13:45:59 +0000623 ---help---
624 Select to build support for Intel Low Power Subsystem such as
625 found on Intel Lynxpoint PCH. Selecting this option enables
Mathias Nyman0f531432013-09-13 17:02:29 +0300626 things like clock tree (common clock framework) and pincontrol
627 which are needed by the LPSS peripheral drivers.
Mika Westerberg3d48aab2013-01-18 13:45:59 +0000628
Ken Xue92082a82015-02-06 08:27:51 +0800629config X86_AMD_PLATFORM_DEVICE
630 bool "AMD ACPI2Platform devices support"
631 depends on ACPI
632 select COMMON_CLK
633 select PINCTRL
634 ---help---
635 Select to interpret AMD specific ACPI device to platform device
636 such as I2C, UART, GPIO found on AMD Carrizo and later chipsets.
637 I2C and UART depend on COMMON_CLK to set clock. GPIO driver is
638 implemented under PINCTRL subsystem.
639
David E. Boxced3ce72014-09-17 22:13:50 -0700640config IOSF_MBI
641 tristate "Intel SoC IOSF Sideband support for SoC platforms"
642 depends on PCI
643 ---help---
644 This option enables sideband register access support for Intel SoC
645 platforms. On these platforms the IOSF sideband is used in lieu of
646 MSR's for some register accesses, mostly but not limited to thermal
647 and power. Drivers may query the availability of this device to
648 determine if they need the sideband in order to work on these
649 platforms. The sideband is available on the following SoC products.
650 This list is not meant to be exclusive.
651 - BayTrail
652 - Braswell
653 - Quark
654
655 You should say Y if you are running a kernel on one of these SoC's.
656
David E. Boxed2226b2014-09-17 22:13:51 -0700657config IOSF_MBI_DEBUG
658 bool "Enable IOSF sideband access through debugfs"
659 depends on IOSF_MBI && DEBUG_FS
660 ---help---
661 Select this option to expose the IOSF sideband access registers (MCR,
662 MDR, MCRX) through debugfs to write and read register information from
663 different units on the SoC. This is most useful for obtaining device
664 state information for debug and analysis. As this is a general access
665 mechanism, users of this option would have specific knowledge of the
666 device they want to access.
667
668 If you don't require the option or are in doubt, say N.
669
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800670config X86_RDC321X
671 bool "RDC R-321x SoC"
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100672 depends on X86_32
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800673 depends on X86_EXTENDED_PLATFORM
674 select M486
675 select X86_REBOOTFIXUPS
676 ---help---
677 This option is needed for RDC R-321x system-on-chip, also known
678 as R-8610-(G).
679 If you don't have one of these chips, you should say N here.
680
Ingo Molnare0c7ae32009-01-27 18:43:09 +0100681config X86_32_NON_STANDARD
Ingo Molnar9c398012009-01-27 18:24:57 +0100682 bool "Support non-standard 32-bit SMP architectures"
683 depends on X86_32 && SMP
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800684 depends on X86_EXTENDED_PLATFORM
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100685 ---help---
H. Peter Anvinb5660ba2014-02-25 12:14:06 -0800686 This option compiles in the bigsmp and STA2X11 default
687 subarchitectures. It is intended for a generic binary
688 kernel. If you select them all, kernel will probe it one by
689 one and will fallback to default.
Yinghai Lud49c4282008-06-08 18:31:54 -0700690
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800691# Alphabetically sorted list of Non standard 32 bit platforms
Yinghai Lud49c4282008-06-08 18:31:54 -0700692
Linus Torvaldsd949f362009-09-26 09:35:07 -0700693config X86_SUPPORTS_MEMORY_FAILURE
Jan Beulich6fc108a2010-04-21 15:23:44 +0100694 def_bool y
Linus Torvaldsd949f362009-09-26 09:35:07 -0700695 # MCE code calls memory_failure():
696 depends on X86_MCE
697 # On 32-bit this adds too big of NODES_SHIFT and we run out of page flags:
Linus Torvaldsd949f362009-09-26 09:35:07 -0700698 # On 32-bit SPARSEMEM adds too big of SECTIONS_WIDTH:
699 depends on X86_64 || !SPARSEMEM
700 select ARCH_SUPPORTS_MEMORY_FAILURE
Linus Torvaldsd949f362009-09-26 09:35:07 -0700701
Alessandro Rubini83125a32012-04-04 19:40:21 +0200702config STA2X11
703 bool "STA2X11 Companion Chip Support"
704 depends on X86_32_NON_STANDARD && PCI
Christoph Hellwigb6e05472018-03-19 11:38:24 +0100705 select ARCH_HAS_PHYS_TO_DMA
Alessandro Rubini83125a32012-04-04 19:40:21 +0200706 select X86_DEV_DMA_OPS
707 select X86_DMA_REMAP
708 select SWIOTLB
709 select MFD_STA2X11
Linus Walleij01450712016-06-02 14:20:18 +0200710 select GPIOLIB
Alessandro Rubini83125a32012-04-04 19:40:21 +0200711 ---help---
712 This adds support for boards based on the STA2X11 IO-Hub,
713 a.k.a. "ConneXt". The chip is used in place of the standard
714 PC chipset, so all "standard" peripherals are missing. If this
715 option is selected the kernel will still be able to boot on
716 standard PC machines.
717
Shérab82148d12010-09-25 06:06:57 +0200718config X86_32_IRIS
719 tristate "Eurobraille/Iris poweroff module"
720 depends on X86_32
721 ---help---
722 The Iris machines from EuroBraille do not have APM or ACPI support
723 to shut themselves down properly. A special I/O sequence is
724 needed to do so, which is what this module does at
725 kernel shutdown.
726
727 This is only for Iris machines from EuroBraille.
728
729 If unused, say N.
730
Ingo Molnarae1e9132008-11-11 09:05:16 +0100731config SCHED_OMIT_FRAME_POINTER
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100732 def_bool y
733 prompt "Single-depth WCHAN output"
Ken Chena87d0912008-11-06 11:10:49 -0800734 depends on X86
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100735 ---help---
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100736 Calculate simpler /proc/<PID>/wchan values. If this option
737 is disabled then wchan values will recurse back to the
738 caller function. This provides more accurate wchan values,
739 at the expense of slightly more scheduling overhead.
740
741 If in doubt, say "Y".
742
Borislav Petkov6276a072013-03-04 21:20:21 +0100743menuconfig HYPERVISOR_GUEST
744 bool "Linux guest support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100745 ---help---
Borislav Petkov6276a072013-03-04 21:20:21 +0100746 Say Y here to enable options for running Linux under various hyper-
747 visors. This option enables basic hypervisor detection and platform
748 setup.
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100749
Borislav Petkov6276a072013-03-04 21:20:21 +0100750 If you say N, all options in this submenu will be skipped and
751 disabled, and Linux guest support won't be built in.
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100752
Borislav Petkov6276a072013-03-04 21:20:21 +0100753if HYPERVISOR_GUEST
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100754
Eduardo Pereira Habkoste61bd942008-01-30 13:33:32 +0100755config PARAVIRT
756 bool "Enable paravirtualization code"
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100757 ---help---
Eduardo Pereira Habkoste61bd942008-01-30 13:33:32 +0100758 This changes the kernel so it can modify itself when it is run
759 under a hypervisor, potentially improving performance significantly
760 over full virtualization. However, when run without a hypervisor
761 the kernel is theoretically slower and slightly larger.
762
Juergen Grossc00a2802018-08-28 09:40:21 +0200763config PARAVIRT_XXL
764 bool
765
Borislav Petkov6276a072013-03-04 21:20:21 +0100766config PARAVIRT_DEBUG
767 bool "paravirt-ops debugging"
768 depends on PARAVIRT && DEBUG_KERNEL
769 ---help---
770 Enable to debug paravirt_ops internals. Specifically, BUG if
771 a paravirt_op is missing when it is called.
772
Jeremy Fitzhardingeb4ecc122009-05-13 17:16:55 -0700773config PARAVIRT_SPINLOCKS
774 bool "Paravirtualization layer for spinlocks"
Kees Cook6ea30382012-10-02 11:16:47 -0700775 depends on PARAVIRT && SMP
Jeremy Fitzhardingeb4ecc122009-05-13 17:16:55 -0700776 ---help---
777 Paravirtualized spinlocks allow a pvops backend to replace the
778 spinlock implementation with something virtualization-friendly
779 (for example, block the virtual CPU rather than spinning).
780
Raghavendra K T4c4e4f62013-10-21 21:35:08 +0530781 It has a minimal impact on native kernels and gives a nice performance
782 benefit on paravirtualized KVM / Xen kernels.
Jeremy Fitzhardingeb4ecc122009-05-13 17:16:55 -0700783
Raghavendra K T4c4e4f62013-10-21 21:35:08 +0530784 If you are unsure how to answer this question, answer Y.
Jeremy Fitzhardingeb4ecc122009-05-13 17:16:55 -0700785
Waiman Long45e898b2015-11-09 19:09:25 -0500786config QUEUED_LOCK_STAT
787 bool "Paravirt queued spinlock statistics"
Peter Zijlstracfd89832016-05-18 20:43:02 +0200788 depends on PARAVIRT_SPINLOCKS && DEBUG_FS
Waiman Long45e898b2015-11-09 19:09:25 -0500789 ---help---
790 Enable the collection of statistical data on the slowpath
791 behavior of paravirtualized queued spinlocks and report
792 them on debugfs.
793
Borislav Petkov6276a072013-03-04 21:20:21 +0100794source "arch/x86/xen/Kconfig"
795
796config KVM_GUEST
797 bool "KVM Guest support (including kvmclock)"
798 depends on PARAVIRT
799 select PARAVIRT_CLOCK
800 default y
801 ---help---
802 This option enables various optimizations for running under the KVM
803 hypervisor. It includes a paravirtualized clock, so that instead
804 of relying on a PIT (or probably other) emulation by the
805 underlying device model, the host provides the guest with
806 timing infrastructure such as time of day, and system time
807
Maran Wilson77336072018-12-10 11:07:28 -0800808config PVH
809 bool "Support for running PVH guests"
810 ---help---
811 This option enables the PVH entry point for guest virtual machines
812 as specified in the x86/HVM direct boot ABI.
813
Srivatsa Vaddagiri1e20eb82013-08-09 19:52:01 +0530814config KVM_DEBUG_FS
815 bool "Enable debug information for KVM Guests in debugfs"
816 depends on KVM_GUEST && DEBUG_FS
Srivatsa Vaddagiri1e20eb82013-08-09 19:52:01 +0530817 ---help---
818 This option enables collection of various statistics for KVM guest.
819 Statistics are displayed in debugfs filesystem. Enabling this option
820 may incur significant overhead.
821
Borislav Petkov6276a072013-03-04 21:20:21 +0100822config PARAVIRT_TIME_ACCOUNTING
823 bool "Paravirtual steal time accounting"
824 depends on PARAVIRT
Borislav Petkov6276a072013-03-04 21:20:21 +0100825 ---help---
826 Select this option to enable fine granularity task steal time
827 accounting. Time spent executing other tasks in parallel with
828 the current vCPU is discounted from the vCPU power. To account for
829 that, there can be a small performance impact.
830
831 If in doubt, say N here.
832
Gerd Hoffmann7af192c2008-06-03 16:17:29 +0200833config PARAVIRT_CLOCK
834 bool
Gerd Hoffmann7af192c2008-06-03 16:17:29 +0200835
Jan Kiszka4a362602017-11-27 09:11:46 +0100836config JAILHOUSE_GUEST
837 bool "Jailhouse non-root cell support"
Arnd Bergmannabde5872018-01-15 16:51:20 +0100838 depends on X86_64 && PCI
Jan Kiszka87e65d02017-11-27 09:11:48 +0100839 select X86_PM_TIMER
Jan Kiszka4a362602017-11-27 09:11:46 +0100840 ---help---
841 This option allows to run Linux as guest in a Jailhouse non-root
842 cell. You can leave this option disabled if you only want to start
843 Jailhouse and run Linux afterwards in the root cell.
844
Borislav Petkov6276a072013-03-04 21:20:21 +0100845endif #HYPERVISOR_GUEST
Jeremy Fitzhardinge97349132008-06-25 00:19:14 -0400846
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100847source "arch/x86/Kconfig.cpu"
848
849config HPET_TIMER
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100850 def_bool X86_64
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100851 prompt "HPET Timer Support" if X86_32
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100852 ---help---
853 Use the IA-PC HPET (High Precision Event Timer) to manage
854 time in preference to the PIT and RTC, if a HPET is
855 present.
856 HPET is the next generation timer replacing legacy 8254s.
857 The HPET provides a stable time base on SMP
858 systems, unlike the TSC, but it is more expensive to access,
Michael S. Tsirkin4e7f9df2016-02-11 01:05:01 +0200859 as it is off-chip. The interface used is documented
860 in the HPET spec, revision 1.
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100861
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100862 You can safely choose Y here. However, HPET will only be
863 activated if the platform and the BIOS support this feature.
864 Otherwise the 8254 will be used for timing services.
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100865
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100866 Choose N to continue using the legacy 8254 timer.
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100867
868config HPET_EMULATE_RTC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100869 def_bool y
Bernhard Walle9d8af782008-02-06 01:38:52 -0800870 depends on HPET_TIMER && (RTC=y || RTC=m || RTC_DRV_CMOS=m || RTC_DRV_CMOS=y)
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100871
Jacob Panbb24c472009-09-02 07:37:17 -0700872config APB_TIMER
Alan Cox933b9462011-12-17 17:43:40 +0000873 def_bool y if X86_INTEL_MID
874 prompt "Intel MID APB Timer Support" if X86_INTEL_MID
Jamie Iles06c3df42011-06-06 12:43:07 +0100875 select DW_APB_TIMER
Alan Coxa0c38322011-12-17 21:57:25 +0000876 depends on X86_INTEL_MID && SFI
Jacob Panbb24c472009-09-02 07:37:17 -0700877 help
878 APB timer is the replacement for 8254, HPET on X86 MID platforms.
879 The APBT provides a stable time base on SMP
880 systems, unlike the TSC, but it is more expensive to access,
881 as it is off-chip. APB timers are always running regardless of CPU
882 C states, they are used as per CPU clockevent device when possible.
883
David Rientjes6a108a12011-01-20 14:44:16 -0800884# Mark as expert because too many people got it wrong.
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100885# The code disables itself when not needed.
Thomas Petazzoni7ae93922008-04-28 02:14:14 -0700886config DMI
887 default y
Ard Biesheuvelcf074402014-01-23 15:54:39 -0800888 select DMI_SCAN_MACHINE_NON_EFI_FALLBACK
David Rientjes6a108a12011-01-20 14:44:16 -0800889 bool "Enable DMI scanning" if EXPERT
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100890 ---help---
Thomas Petazzoni7ae93922008-04-28 02:14:14 -0700891 Enabled scanning of DMI to identify machine quirks. Say Y
892 here unless you have verified that your setup is not
893 affected by entries in the DMI blacklist. Required by PNP
894 BIOS code.
895
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100896config GART_IOMMU
Andi Kleen38901f12013-10-04 14:37:56 -0700897 bool "Old AMD GART IOMMU support"
Christoph Hellwiga4ce5a42018-04-03 15:47:59 +0200898 select IOMMU_HELPER
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100899 select SWIOTLB
Andreas Herrmann23ac4ae2010-09-17 18:03:43 +0200900 depends on X86_64 && PCI && AMD_NB
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100901 ---help---
Ingo Molnarced3c422013-10-06 11:45:20 +0200902 Provides a driver for older AMD Athlon64/Opteron/Turion/Sempron
903 GART based hardware IOMMUs.
904
905 The GART supports full DMA access for devices with 32-bit access
906 limitations, on systems with more than 3 GB. This is usually needed
907 for USB, sound, many IDE/SATA chipsets and some other devices.
908
909 Newer systems typically have a modern AMD IOMMU, supported via
910 the CONFIG_AMD_IOMMU=y config option.
911
912 In normal configurations this driver is only active when needed:
913 there's more than 3 GB of memory and the system contains a
914 32-bit limited device.
915
916 If unsure, say Y.
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100917
918config CALGARY_IOMMU
919 bool "IBM Calgary IOMMU support"
Christoph Hellwiga4ce5a42018-04-03 15:47:59 +0200920 select IOMMU_HELPER
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100921 select SWIOTLB
Kees Cook6ea30382012-10-02 11:16:47 -0700922 depends on X86_64 && PCI
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100923 ---help---
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100924 Support for hardware IOMMUs in IBM's xSeries x366 and x460
925 systems. Needed to run systems with more than 3GB of memory
926 properly with 32-bit PCI devices that do not support DAC
927 (Double Address Cycle). Calgary also supports bus level
928 isolation, where all DMAs pass through the IOMMU. This
929 prevents them from going anywhere except their intended
930 destination. This catches hard-to-find kernel bugs and
931 mis-behaving drivers and devices that do not use the DMA-API
932 properly to set up their DMA buffers. The IOMMU can be
933 turned off at boot time with the iommu=off parameter.
934 Normally the kernel will make the right choice by itself.
935 If unsure, say Y.
936
937config CALGARY_IOMMU_ENABLED_BY_DEFAULT
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100938 def_bool y
939 prompt "Should Calgary be enabled by default?"
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100940 depends on CALGARY_IOMMU
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100941 ---help---
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100942 Should Calgary be enabled by default? if you choose 'y', Calgary
943 will be used (if it exists). If you choose 'n', Calgary will not be
944 used even if it exists. If you choose 'n' and would like to use
945 Calgary anyway, pass 'iommu=calgary' on the kernel command line.
946 If unsure, say Y.
947
Mike Travis1184dc22008-05-12 21:21:12 +0200948config MAXSMP
Samuel Thibaultddb0c5a2010-08-21 21:32:41 +0200949 bool "Enable Maximum number of SMP Processors and NUMA Nodes"
Kees Cook6ea30382012-10-02 11:16:47 -0700950 depends on X86_64 && SMP && DEBUG_KERNEL
Mike Travis36f51012008-12-16 17:33:51 -0800951 select CPUMASK_OFFSTACK
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100952 ---help---
Samuel Thibaultddb0c5a2010-08-21 21:32:41 +0200953 Enable maximum number of CPUS and NUMA Nodes for this architecture.
Mike Travis1184dc22008-05-12 21:21:12 +0200954 If unsure, say N.
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100955
Ingo Molnaraec64872018-02-10 12:36:29 +0100956#
957# The maximum number of CPUs supported:
958#
959# The main config value is NR_CPUS, which defaults to NR_CPUS_DEFAULT,
960# and which can be configured interactively in the
961# [NR_CPUS_RANGE_BEGIN ... NR_CPUS_RANGE_END] range.
962#
963# The ranges are different on 32-bit and 64-bit kernels, depending on
964# hardware capabilities and scalability features of the kernel.
965#
966# ( If MAXSMP is enabled we just use the highest possible value and disable
967# interactive configuration. )
968#
969
970config NR_CPUS_RANGE_BEGIN
971 int
972 default NR_CPUS_RANGE_END if MAXSMP
973 default 1 if !SMP
974 default 2
975
976config NR_CPUS_RANGE_END
Randy Dunlapa0d0bb42018-02-09 16:51:03 -0800977 int
978 depends on X86_32
Ingo Molnaraec64872018-02-10 12:36:29 +0100979 default 64 if SMP && X86_BIGSMP
980 default 8 if SMP && !X86_BIGSMP
981 default 1 if !SMP
Randy Dunlapa0d0bb42018-02-09 16:51:03 -0800982
Ingo Molnaraec64872018-02-10 12:36:29 +0100983config NR_CPUS_RANGE_END
Randy Dunlapa0d0bb42018-02-09 16:51:03 -0800984 int
985 depends on X86_64
Ingo Molnaraec64872018-02-10 12:36:29 +0100986 default 8192 if SMP && ( MAXSMP || CPUMASK_OFFSTACK)
987 default 512 if SMP && (!MAXSMP && !CPUMASK_OFFSTACK)
988 default 1 if !SMP
Randy Dunlapa0d0bb42018-02-09 16:51:03 -0800989
Ingo Molnaraec64872018-02-10 12:36:29 +0100990config NR_CPUS_DEFAULT
Randy Dunlapa0d0bb42018-02-09 16:51:03 -0800991 int
992 depends on X86_32
Ingo Molnaraec64872018-02-10 12:36:29 +0100993 default 32 if X86_BIGSMP
994 default 8 if SMP
995 default 1 if !SMP
Randy Dunlapa0d0bb42018-02-09 16:51:03 -0800996
Ingo Molnaraec64872018-02-10 12:36:29 +0100997config NR_CPUS_DEFAULT
Randy Dunlapa0d0bb42018-02-09 16:51:03 -0800998 int
999 depends on X86_64
Ingo Molnaraec64872018-02-10 12:36:29 +01001000 default 8192 if MAXSMP
1001 default 64 if SMP
1002 default 1 if !SMP
Randy Dunlapa0d0bb42018-02-09 16:51:03 -08001003
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001004config NR_CPUS
Mike Travis36f51012008-12-16 17:33:51 -08001005 int "Maximum number of CPUs" if SMP && !MAXSMP
Ingo Molnaraec64872018-02-10 12:36:29 +01001006 range NR_CPUS_RANGE_BEGIN NR_CPUS_RANGE_END
1007 default NR_CPUS_DEFAULT
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001008 ---help---
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001009 This allows you to specify the maximum number of CPUs which this
Josh Boyerbb61ccc2013-11-05 09:37:29 -05001010 kernel will support. If CPUMASK_OFFSTACK is enabled, the maximum
Kirill A. Shutemovcad14bb2015-05-08 13:25:26 +03001011 supported value is 8192, otherwise the maximum value is 512. The
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001012 minimum value which makes sense is 2.
1013
Ingo Molnaraec64872018-02-10 12:36:29 +01001014 This is purely to save memory: each supported CPU adds about 8KB
1015 to the kernel image.
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001016
1017config SCHED_SMT
Thomas Gleixnerdbe73362018-11-25 19:33:37 +01001018 def_bool y if SMP
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001019
1020config SCHED_MC
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001021 def_bool y
1022 prompt "Multi-core scheduler support"
Borislav Petkovc8e56d22015-06-04 18:55:25 +02001023 depends on SMP
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001024 ---help---
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001025 Multi-core scheduler support improves the CPU scheduler's decision
1026 making when dealing with multi-core CPU chips at a cost of slightly
1027 increased overhead in some places. If unsure say N here.
1028
Tim Chende966cf2016-11-29 10:43:27 -08001029config SCHED_MC_PRIO
1030 bool "CPU core priorities scheduler support"
Ingo Molnar0a21fc12016-11-30 08:33:54 +01001031 depends on SCHED_MC && CPU_SUP_INTEL
1032 select X86_INTEL_PSTATE
1033 select CPU_FREQ
Tim Chende966cf2016-11-29 10:43:27 -08001034 default y
Tim Chen5e76b2a2016-11-22 12:23:55 -08001035 ---help---
Ingo Molnar0a21fc12016-11-30 08:33:54 +01001036 Intel Turbo Boost Max Technology 3.0 enabled CPUs have a
1037 core ordering determined at manufacturing time, which allows
1038 certain cores to reach higher turbo frequencies (when running
1039 single threaded workloads) than others.
Tim Chende966cf2016-11-29 10:43:27 -08001040
Ingo Molnar0a21fc12016-11-30 08:33:54 +01001041 Enabling this kernel feature teaches the scheduler about
1042 the TBM3 (aka ITMT) priority order of the CPU cores and adjusts the
1043 scheduler's CPU selection logic accordingly, so that higher
1044 overall system performance can be achieved.
Tim Chende966cf2016-11-29 10:43:27 -08001045
Ingo Molnar0a21fc12016-11-30 08:33:54 +01001046 This feature will have no effect on CPUs without this feature.
Tim Chende966cf2016-11-29 10:43:27 -08001047
Ingo Molnar0a21fc12016-11-30 08:33:54 +01001048 If unsure say Y here.
Tim Chen5e76b2a2016-11-22 12:23:55 -08001049
Thomas Gleixner30b8b002015-01-15 21:22:39 +00001050config UP_LATE_INIT
1051 def_bool y
Thomas Gleixnerba360f8872015-01-24 10:34:46 +01001052 depends on !SMP && X86_LOCAL_APIC
Thomas Gleixner30b8b002015-01-15 21:22:39 +00001053
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001054config X86_UP_APIC
Jan Beulich50849ee2015-02-05 15:31:56 +00001055 bool "Local APIC support on uniprocessors" if !PCI_MSI
1056 default PCI_MSI
Bryan O'Donoghue38a1dfd2015-01-22 22:58:49 +00001057 depends on X86_32 && !SMP && !X86_32_NON_STANDARD
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001058 ---help---
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001059 A local APIC (Advanced Programmable Interrupt Controller) is an
1060 integrated interrupt controller in the CPU. If you have a single-CPU
1061 system which has a processor with a local APIC, you can say Y here to
1062 enable and use it. If you say Y here even though your machine doesn't
1063 have a local APIC, then the kernel will still run with no slowdown at
1064 all. The local APIC supports CPU-generated self-interrupts (timer,
1065 performance counters), and the NMI watchdog which detects hard
1066 lockups.
1067
1068config X86_UP_IOAPIC
1069 bool "IO-APIC support on uniprocessors"
1070 depends on X86_UP_APIC
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001071 ---help---
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001072 An IO-APIC (I/O Advanced Programmable Interrupt Controller) is an
1073 SMP-capable replacement for PC-style interrupt controllers. Most
1074 SMP systems and many recent uniprocessor systems have one.
1075
1076 If you have a single-CPU system with an IO-APIC, you can say Y here
1077 to use it. If you say Y here even though your machine doesn't have
1078 an IO-APIC, then the kernel will still run with no slowdown at all.
1079
1080config X86_LOCAL_APIC
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001081 def_bool y
Thomas Petazzoni0dbc6072013-10-03 11:59:14 +02001082 depends on X86_64 || SMP || X86_32_NON_STANDARD || X86_UP_APIC || PCI_MSI
Jiang Liub5dc8e62015-04-13 14:11:24 +08001083 select IRQ_DOMAIN_HIERARCHY
Jiang Liu52f518a2015-04-13 14:11:35 +08001084 select PCI_MSI_IRQ_DOMAIN if PCI_MSI
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001085
1086config X86_IO_APIC
Jan Beulichb1da1e72015-02-05 15:35:21 +00001087 def_bool y
1088 depends on X86_LOCAL_APIC || X86_UP_IOAPIC
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001089
Stefan Assmann41b9eb22008-07-15 13:48:55 +02001090config X86_REROUTE_FOR_BROKEN_BOOT_IRQS
1091 bool "Reroute for broken boot IRQs"
Stefan Assmann41b9eb22008-07-15 13:48:55 +02001092 depends on X86_IO_APIC
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001093 ---help---
Stefan Assmann41b9eb22008-07-15 13:48:55 +02001094 This option enables a workaround that fixes a source of
1095 spurious interrupts. This is recommended when threaded
1096 interrupt handling is used on systems where the generation of
1097 superfluous "boot interrupts" cannot be disabled.
1098
1099 Some chipsets generate a legacy INTx "boot IRQ" when the IRQ
1100 entry in the chipset's IO-APIC is masked (as, e.g. the RT
1101 kernel does during interrupt handling). On chipsets where this
1102 boot IRQ generation cannot be disabled, this workaround keeps
1103 the original IRQ line masked so that only the equivalent "boot
1104 IRQ" is delivered to the CPUs. The workaround also tells the
1105 kernel to set up the IRQ handler on the boot IRQ line. In this
1106 way only one interrupt is delivered to the kernel. Otherwise
1107 the spurious second interrupt may cause the kernel to bring
1108 down (vital) interrupt lines.
1109
1110 Only affects "broken" chipsets. Interrupt sharing may be
1111 increased on these systems.
1112
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001113config X86_MCE
Andi Kleenbab9bc62009-07-09 00:31:38 +02001114 bool "Machine Check / overheating reporting"
Chen, Gong648ed942015-08-12 18:29:34 +02001115 select GENERIC_ALLOCATOR
Borislav Petkove57dbaf2011-09-13 15:23:21 +02001116 default y
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001117 ---help---
Andi Kleenbab9bc62009-07-09 00:31:38 +02001118 Machine Check support allows the processor to notify the
1119 kernel if it detects a problem (e.g. overheating, data corruption).
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001120 The action the kernel takes depends on the severity of the problem,
Andi Kleenbab9bc62009-07-09 00:31:38 +02001121 ranging from warning messages to halting the machine.
Andi Kleen4efc0672009-04-28 19:07:31 +02001122
Tony Luck5de97c92017-03-27 11:33:03 +02001123config X86_MCELOG_LEGACY
1124 bool "Support for deprecated /dev/mcelog character device"
1125 depends on X86_MCE
1126 ---help---
1127 Enable support for /dev/mcelog which is needed by the old mcelog
1128 userspace logging daemon. Consider switching to the new generation
1129 rasdaemon solution.
1130
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001131config X86_MCE_INTEL
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001132 def_bool y
1133 prompt "Intel MCE features"
Andi Kleenc1ebf832009-07-09 00:31:41 +02001134 depends on X86_MCE && X86_LOCAL_APIC
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001135 ---help---
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001136 Additional support for intel specific MCE features such as
1137 the thermal monitor.
1138
1139config X86_MCE_AMD
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001140 def_bool y
1141 prompt "AMD MCE features"
Yazen Ghannamf5382de2016-11-17 17:57:27 -05001142 depends on X86_MCE && X86_LOCAL_APIC && AMD_NB
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001143 ---help---
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001144 Additional support for AMD specific MCE features such as
1145 the DRAM Error Threshold.
1146
Andi Kleen4efc0672009-04-28 19:07:31 +02001147config X86_ANCIENT_MCE
Jan Beulich6fc108a2010-04-21 15:23:44 +01001148 bool "Support for old Pentium 5 / WinChip machine checks"
Andi Kleenc31d9632009-07-09 00:31:37 +02001149 depends on X86_32 && X86_MCE
Hidetoshi Setocd13adcc2009-05-27 16:57:31 +09001150 ---help---
1151 Include support for machine check handling on old Pentium 5 or WinChip
Masanari Iida5065a702013-11-30 21:38:43 +09001152 systems. These typically need to be enabled explicitly on the command
Hidetoshi Setocd13adcc2009-05-27 16:57:31 +09001153 line.
Andi Kleen4efc0672009-04-28 19:07:31 +02001154
Andi Kleenb2762682009-02-12 13:49:31 +01001155config X86_MCE_THRESHOLD
1156 depends on X86_MCE_AMD || X86_MCE_INTEL
Jan Beulich6fc108a2010-04-21 15:23:44 +01001157 def_bool y
Andi Kleenb2762682009-02-12 13:49:31 +01001158
Andi Kleenea149b32009-04-29 19:31:00 +02001159config X86_MCE_INJECT
Borislav Petkovbc8e80d2017-06-13 18:28:30 +02001160 depends on X86_MCE && X86_LOCAL_APIC && DEBUG_FS
Andi Kleenea149b32009-04-29 19:31:00 +02001161 tristate "Machine check injector support"
1162 ---help---
1163 Provide support for injecting machine checks for testing purposes.
1164 If you don't know what a machine check is and you don't do kernel
1165 QA it is safe to say n.
1166
Andi Kleen4efc0672009-04-28 19:07:31 +02001167config X86_THERMAL_VECTOR
1168 def_bool y
Andi Kleen5bb38ad2009-07-09 00:31:39 +02001169 depends on X86_MCE_INTEL
Andi Kleen4efc0672009-04-28 19:07:31 +02001170
Peter Zijlstra07dc9002016-03-29 14:30:35 +02001171source "arch/x86/events/Kconfig"
Kan Liange633c652016-03-20 01:33:36 -07001172
Andy Lutomirski5aef51c2015-07-10 08:34:23 -07001173config X86_LEGACY_VM86
Ingo Molnar1e642812015-09-05 08:58:10 +02001174 bool "Legacy VM86 support"
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001175 depends on X86_32
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001176 ---help---
Andy Lutomirski5aef51c2015-07-10 08:34:23 -07001177 This option allows user programs to put the CPU into V8086
1178 mode, which is an 80286-era approximation of 16-bit real mode.
1179
1180 Some very old versions of X and/or vbetool require this option
1181 for user mode setting. Similarly, DOSEMU will use it if
1182 available to accelerate real mode DOS programs. However, any
1183 recent version of DOSEMU, X, or vbetool should be fully
1184 functional even without kernel VM86 support, as they will all
Ingo Molnar1e642812015-09-05 08:58:10 +02001185 fall back to software emulation. Nevertheless, if you are using
1186 a 16-bit DOS program where 16-bit performance matters, vm86
1187 mode might be faster than emulation and you might want to
1188 enable this option.
Andy Lutomirski5aef51c2015-07-10 08:34:23 -07001189
Ingo Molnar1e642812015-09-05 08:58:10 +02001190 Note that any app that works on a 64-bit kernel is unlikely to
1191 need this option, as 64-bit kernels don't, and can't, support
1192 V8086 mode. This option is also unrelated to 16-bit protected
1193 mode and is not needed to run most 16-bit programs under Wine.
Andy Lutomirski5aef51c2015-07-10 08:34:23 -07001194
Ingo Molnar1e642812015-09-05 08:58:10 +02001195 Enabling this option increases the complexity of the kernel
1196 and slows down exception handling a tiny bit.
Andy Lutomirski5aef51c2015-07-10 08:34:23 -07001197
Ingo Molnar1e642812015-09-05 08:58:10 +02001198 If unsure, say N here.
Andy Lutomirski5aef51c2015-07-10 08:34:23 -07001199
1200config VM86
1201 bool
1202 default X86_LEGACY_VM86
H. Peter Anvin34273f42014-05-04 10:36:22 -07001203
1204config X86_16BIT
1205 bool "Enable support for 16-bit segments" if EXPERT
1206 default y
Andy Lutomirskia5b9e5a2015-07-30 14:31:34 -07001207 depends on MODIFY_LDT_SYSCALL
H. Peter Anvin34273f42014-05-04 10:36:22 -07001208 ---help---
1209 This option is required by programs like Wine to run 16-bit
1210 protected mode legacy code on x86 processors. Disabling
1211 this option saves about 300 bytes on i386, or around 6K text
1212 plus 16K runtime memory on x86-64,
1213
1214config X86_ESPFIX32
1215 def_bool y
1216 depends on X86_16BIT && X86_32
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001217
H. Peter Anvin197725d2014-05-04 10:00:49 -07001218config X86_ESPFIX64
1219 def_bool y
H. Peter Anvin34273f42014-05-04 10:36:22 -07001220 depends on X86_16BIT && X86_64
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001221
Andy Lutomirski1ad83c82014-10-29 14:33:47 -07001222config X86_VSYSCALL_EMULATION
1223 bool "Enable vsyscall emulation" if EXPERT
1224 default y
1225 depends on X86_64
1226 ---help---
1227 This enables emulation of the legacy vsyscall page. Disabling
1228 it is roughly equivalent to booting with vsyscall=none, except
1229 that it will also disable the helpful warning if a program
1230 tries to use a vsyscall. With this option set to N, offending
1231 programs will just segfault, citing addresses of the form
1232 0xffffffffff600?00.
1233
1234 This option is required by many programs built before 2013, and
1235 care should be used even with newer programs if set to N.
1236
1237 Disabling this option saves about 7K of kernel size and
1238 possibly 4K of additional runtime pagetable memory.
1239
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001240config TOSHIBA
1241 tristate "Toshiba Laptop support"
1242 depends on X86_32
1243 ---help---
1244 This adds a driver to safely access the System Management Mode of
1245 the CPU on Toshiba portables with a genuine Toshiba BIOS. It does
1246 not work on models with a Phoenix BIOS. The System Management Mode
1247 is used to set the BIOS and power saving options on Toshiba portables.
1248
1249 For information on utilities to make use of this driver see the
1250 Toshiba Linux utilities web site at:
1251 <http://www.buzzard.org.uk/toshiba/>.
1252
1253 Say Y if you intend to run this kernel on a Toshiba portable.
1254 Say N otherwise.
1255
1256config I8K
Pali Rohár039ae582015-05-14 13:16:37 +02001257 tristate "Dell i8k legacy laptop support"
Jean Delvare949a9d72011-05-25 20:43:33 +02001258 select HWMON
Pali Rohár039ae582015-05-14 13:16:37 +02001259 select SENSORS_DELL_SMM
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001260 ---help---
Pali Rohár039ae582015-05-14 13:16:37 +02001261 This option enables legacy /proc/i8k userspace interface in hwmon
1262 dell-smm-hwmon driver. Character file /proc/i8k reports bios version,
1263 temperature and allows controlling fan speeds of Dell laptops via
1264 System Management Mode. For old Dell laptops (like Dell Inspiron 8000)
1265 it reports also power and hotkey status. For fan speed control is
1266 needed userspace package i8kutils.
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001267
Pali Rohár039ae582015-05-14 13:16:37 +02001268 Say Y if you intend to run this kernel on old Dell laptops or want to
1269 use userspace package i8kutils.
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001270 Say N otherwise.
1271
1272config X86_REBOOTFIXUPS
Jan Beulich9ba16082008-10-15 22:01:38 -07001273 bool "Enable X86 board specific fixups for reboot"
1274 depends on X86_32
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001275 ---help---
1276 This enables chipset and/or board specific fixups to be done
1277 in order to get reboot to work correctly. This is only needed on
1278 some combinations of hardware and BIOS. The symptom, for which
1279 this config is intended, is when reboot ends with a stalled/hung
1280 system.
1281
1282 Currently, the only fixup is for the Geode machines using
Florian Fainelli5e3a77e2008-01-30 13:33:36 +01001283 CS5530A and CS5536 chipsets and the RDC R-321x SoC.
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001284
1285 Say Y if you want to enable the fixup. Currently, it's safe to
1286 enable this option even if you don't need it.
1287 Say N otherwise.
1288
1289config MICROCODE
Borislav Petkov9a2bc332015-10-20 11:54:44 +02001290 bool "CPU microcode loading support"
1291 default y
Borislav Petkov80030e32013-10-13 18:36:29 +02001292 depends on CPU_SUP_AMD || CPU_SUP_INTEL
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001293 select FW_LOADER
1294 ---help---
1295 If you say Y here, you will be able to update the microcode on
Borislav Petkov5f9c01a2016-02-03 12:33:29 +01001296 Intel and AMD processors. The Intel support is for the IA32 family,
1297 e.g. Pentium Pro, Pentium II, Pentium III, Pentium 4, Xeon etc. The
1298 AMD support is for families 0x10 and later. You will obviously need
1299 the actual microcode binary data itself which is not shipped with
1300 the Linux kernel.
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001301
Borislav Petkov5f9c01a2016-02-03 12:33:29 +01001302 The preferred method to load microcode from a detached initrd is described
Jaak Ristioja1897a962018-02-09 11:22:16 +02001303 in Documentation/x86/microcode.txt. For that you need to enable
Borislav Petkov5f9c01a2016-02-03 12:33:29 +01001304 CONFIG_BLK_DEV_INITRD in order for the loader to be able to scan the
1305 initrd for microcode blobs.
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001306
Benjamin Gilbertc508c462018-01-23 18:06:32 -08001307 In addition, you can build the microcode into the kernel. For that you
1308 need to add the vendor-supplied microcode to the CONFIG_EXTRA_FIRMWARE
1309 config option.
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001310
Peter Oruba8d86f392008-07-28 18:44:21 +02001311config MICROCODE_INTEL
Borislav Petkove43f6e62012-08-01 19:17:01 +02001312 bool "Intel microcode loading support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001313 depends on MICROCODE
1314 default MICROCODE
1315 select FW_LOADER
1316 ---help---
1317 This options enables microcode patch loading support for Intel
1318 processors.
Peter Oruba8d86f392008-07-28 18:44:21 +02001319
Alanb8989db2014-01-20 18:01:56 +00001320 For the current Intel microcode data package go to
1321 <https://downloadcenter.intel.com> and search for
1322 'Linux Processor Microcode Data File'.
Peter Oruba8d86f392008-07-28 18:44:21 +02001323
Peter Oruba80cc9f12008-07-28 18:44:22 +02001324config MICROCODE_AMD
Borislav Petkove43f6e62012-08-01 19:17:01 +02001325 bool "AMD microcode loading support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001326 depends on MICROCODE
1327 select FW_LOADER
1328 ---help---
1329 If you select this option, microcode patch loading support for AMD
1330 processors will be enabled.
Peter Oruba80cc9f12008-07-28 18:44:22 +02001331
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001332config MICROCODE_OLD_INTERFACE
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001333 def_bool y
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001334 depends on MICROCODE
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001335
1336config X86_MSR
1337 tristate "/dev/cpu/*/msr - Model-specific register support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001338 ---help---
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001339 This device gives privileged processes access to the x86
1340 Model-Specific Registers (MSRs). It is a character device with
1341 major 202 and minors 0 to 31 for /dev/cpu/0/msr to /dev/cpu/31/msr.
1342 MSR accesses are directed to a specific CPU on multi-processor
1343 systems.
1344
1345config X86_CPUID
1346 tristate "/dev/cpu/*/cpuid - CPU information support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001347 ---help---
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001348 This device gives processes access to the x86 CPUID instruction to
1349 be executed on a specific processor. It is a character device
1350 with major 203 and minors 0 to 31 for /dev/cpu/0/cpuid to
1351 /dev/cpu/31/cpuid.
1352
1353choice
1354 prompt "High Memory Support"
Jan Beulich6fc108a2010-04-21 15:23:44 +01001355 default HIGHMEM4G
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001356 depends on X86_32
1357
1358config NOHIGHMEM
1359 bool "off"
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001360 ---help---
1361 Linux can use up to 64 Gigabytes of physical memory on x86 systems.
1362 However, the address space of 32-bit x86 processors is only 4
1363 Gigabytes large. That means that, if you have a large amount of
1364 physical memory, not all of it can be "permanently mapped" by the
1365 kernel. The physical memory that's not permanently mapped is called
1366 "high memory".
1367
1368 If you are compiling a kernel which will never run on a machine with
1369 more than 1 Gigabyte total physical RAM, answer "off" here (default
1370 choice and suitable for most users). This will result in a "3GB/1GB"
1371 split: 3GB are mapped so that each process sees a 3GB virtual memory
1372 space and the remaining part of the 4GB virtual memory space is used
1373 by the kernel to permanently map as much physical memory as
1374 possible.
1375
1376 If the machine has between 1 and 4 Gigabytes physical RAM, then
1377 answer "4GB" here.
1378
1379 If more than 4 Gigabytes is used then answer "64GB" here. This
1380 selection turns Intel PAE (Physical Address Extension) mode on.
1381 PAE implements 3-level paging on IA32 processors. PAE is fully
1382 supported by Linux, PAE mode is implemented on all recent Intel
1383 processors (Pentium Pro and better). NOTE: If you say "64GB" here,
1384 then the kernel will not boot on CPUs that don't support PAE!
1385
1386 The actual amount of total physical memory will either be
1387 auto detected or can be forced by using a kernel command line option
1388 such as "mem=256M". (Try "man bootparam" or see the documentation of
1389 your boot loader (lilo or loadlin) about how to pass options to the
1390 kernel at boot time.)
1391
1392 If unsure, say "off".
1393
1394config HIGHMEM4G
1395 bool "4GB"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001396 ---help---
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001397 Select this if you have a 32-bit processor and between 1 and 4
1398 gigabytes of physical RAM.
1399
1400config HIGHMEM64G
1401 bool "64GB"
Matthew Whitehead69b8d3f2018-02-15 11:54:55 -05001402 depends on !M486 && !M586 && !M586TSC && !M586MMX && !MGEODE_LX && !MGEODEGX1 && !MCYRIXIII && !MELAN && !MWINCHIPC6 && !WINCHIP3D && !MK6
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001403 select X86_PAE
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001404 ---help---
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001405 Select this if you have a 32-bit processor and more than 4
1406 gigabytes of physical RAM.
1407
1408endchoice
1409
1410choice
David Rientjes6a108a12011-01-20 14:44:16 -08001411 prompt "Memory split" if EXPERT
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001412 default VMSPLIT_3G
1413 depends on X86_32
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001414 ---help---
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001415 Select the desired split between kernel and user memory.
1416
1417 If the address range available to the kernel is less than the
1418 physical memory installed, the remaining memory will be available
1419 as "high memory". Accessing high memory is a little more costly
1420 than low memory, as it needs to be mapped into the kernel first.
1421 Note that increasing the kernel address space limits the range
1422 available to user programs, making the address space there
1423 tighter. Selecting anything other than the default 3G/1G split
1424 will also likely make your kernel incompatible with binary-only
1425 kernel modules.
1426
1427 If you are not absolutely sure what you are doing, leave this
1428 option alone!
1429
1430 config VMSPLIT_3G
1431 bool "3G/1G user/kernel split"
1432 config VMSPLIT_3G_OPT
1433 depends on !X86_PAE
1434 bool "3G/1G user/kernel split (for full 1G low memory)"
1435 config VMSPLIT_2G
1436 bool "2G/2G user/kernel split"
1437 config VMSPLIT_2G_OPT
1438 depends on !X86_PAE
1439 bool "2G/2G user/kernel split (for full 2G low memory)"
1440 config VMSPLIT_1G
1441 bool "1G/3G user/kernel split"
1442endchoice
1443
1444config PAGE_OFFSET
1445 hex
1446 default 0xB0000000 if VMSPLIT_3G_OPT
1447 default 0x80000000 if VMSPLIT_2G
1448 default 0x78000000 if VMSPLIT_2G_OPT
1449 default 0x40000000 if VMSPLIT_1G
1450 default 0xC0000000
1451 depends on X86_32
1452
1453config HIGHMEM
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001454 def_bool y
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001455 depends on X86_32 && (HIGHMEM64G || HIGHMEM4G)
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001456
1457config X86_PAE
Jan Beulich9ba16082008-10-15 22:01:38 -07001458 bool "PAE (Physical Address Extension) Support"
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001459 depends on X86_32 && !HIGHMEM4G
Christoph Hellwigd4a451d2018-04-03 16:24:20 +02001460 select PHYS_ADDR_T_64BIT
Christian Melki9d99c712015-10-05 17:31:33 +02001461 select SWIOTLB
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001462 ---help---
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001463 PAE is required for NX support, and furthermore enables
1464 larger swapspace support for non-overcommit purposes. It
1465 has the cost of more pagetable lookup overhead, and also
1466 consumes more pagetable space per process.
1467
Kirill A. Shutemov77ef56e2017-07-17 01:59:54 +03001468config X86_5LEVEL
1469 bool "Enable 5-level page tables support"
Kirill A. Shutemoveedb92a2018-02-14 14:16:50 +03001470 select DYNAMIC_MEMORY_LAYOUT
Kirill A. Shutemov162434e2018-02-14 14:16:54 +03001471 select SPARSEMEM_VMEMMAP
Kirill A. Shutemov77ef56e2017-07-17 01:59:54 +03001472 depends on X86_64
1473 ---help---
1474 5-level paging enables access to larger address space:
1475 upto 128 PiB of virtual address space and 4 PiB of
1476 physical address space.
1477
1478 It will be supported by future Intel CPUs.
1479
Kirill A. Shutemov6657fca2018-02-14 21:25:42 +03001480 A kernel with the option enabled can be booted on machines that
1481 support 4- or 5-level paging.
Kirill A. Shutemov77ef56e2017-07-17 01:59:54 +03001482
1483 See Documentation/x86/x86_64/5level-paging.txt for more
1484 information.
1485
1486 Say N if unsure.
1487
Ingo Molnar10971ab2015-03-05 08:18:23 +01001488config X86_DIRECT_GBPAGES
Luis R. Rodrigueze5008ab2015-03-04 17:24:12 -08001489 def_bool y
Levin, Alexander (Sasha Levin)4675ff02017-11-15 17:36:02 -08001490 depends on X86_64 && !DEBUG_PAGEALLOC
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001491 ---help---
Ingo Molnar10971ab2015-03-05 08:18:23 +01001492 Certain kernel features effectively disable kernel
1493 linear 1 GB mappings (even if the CPU otherwise
1494 supports them), so don't confuse the user by printing
1495 that we have them enabled.
Nick Piggin9e899812008-10-22 12:33:16 +02001496
Thomas Gleixner5c280cf2018-09-17 16:29:12 +02001497config X86_CPA_STATISTICS
1498 bool "Enable statistic for Change Page Attribute"
1499 depends on DEBUG_FS
1500 ---help---
1501 Expose statistics about the Change Page Attribute mechanims, which
1502 helps to determine the effectivness of preserving large and huge
1503 page mappings when mapping protections are changed.
1504
Tom Lendacky7744ccd2017-07-17 16:10:03 -05001505config ARCH_HAS_MEM_ENCRYPT
1506 def_bool y
1507
1508config AMD_MEM_ENCRYPT
1509 bool "AMD Secure Memory Encryption (SME) support"
1510 depends on X86_64 && CPU_SUP_AMD
Kirill A. Shutemov94d49eb2018-05-18 14:30:28 +03001511 select DYNAMIC_PHYSICAL_MASK
Ard Biesheuvelce9084b2019-02-02 10:41:17 +01001512 select ARCH_USE_MEMREMAP_PROT
Tom Lendacky7744ccd2017-07-17 16:10:03 -05001513 ---help---
1514 Say yes to enable support for the encryption of system memory.
1515 This requires an AMD processor that supports Secure Memory
1516 Encryption (SME).
1517
1518config AMD_MEM_ENCRYPT_ACTIVE_BY_DEFAULT
1519 bool "Activate AMD Secure Memory Encryption (SME) by default"
1520 default y
1521 depends on AMD_MEM_ENCRYPT
1522 ---help---
1523 Say yes to have system memory encrypted by default if running on
1524 an AMD processor that supports Secure Memory Encryption (SME).
1525
1526 If set to Y, then the encryption of system memory can be
1527 deactivated with the mem_encrypt=off command line option.
1528
1529 If set to N, then the encryption of system memory can be
1530 activated with the mem_encrypt=on command line option.
1531
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001532# Common NUMA Features
1533config NUMA
KOSAKI Motohirofd51b2d2008-11-05 02:27:19 +09001534 bool "Numa Memory Allocation and Scheduler Support"
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001535 depends on SMP
H. Peter Anvinb5660ba2014-02-25 12:14:06 -08001536 depends on X86_64 || (X86_32 && HIGHMEM64G && X86_BIGSMP)
1537 default y if X86_BIGSMP
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001538 ---help---
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001539 Enable NUMA (Non Uniform Memory Access) support.
KOSAKI Motohirofd51b2d2008-11-05 02:27:19 +09001540
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001541 The kernel will try to allocate memory used by a CPU on the
1542 local memory controller of the CPU and add some more
1543 NUMA awareness to the kernel.
1544
Ingo Molnarc280ea52008-11-08 13:29:45 +01001545 For 64-bit this is recommended if the system is Intel Core i7
KOSAKI Motohirofd51b2d2008-11-05 02:27:19 +09001546 (or later), AMD Opteron, or EM64T NUMA.
1547
H. Peter Anvinb5660ba2014-02-25 12:14:06 -08001548 For 32-bit this is only needed if you boot a 32-bit
David Rientjes7cf6c942014-02-11 18:11:13 -08001549 kernel on a 64-bit NUMA platform.
KOSAKI Motohirofd51b2d2008-11-05 02:27:19 +09001550
1551 Otherwise, you should say N.
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001552
Hans Rosenfeldeec1d4f2010-10-29 17:14:30 +02001553config AMD_NUMA
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001554 def_bool y
1555 prompt "Old style AMD Opteron NUMA detection"
Tejun Heo5da0ef92011-07-11 10:34:32 +02001556 depends on X86_64 && NUMA && PCI
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001557 ---help---
Hans Rosenfeldeec1d4f2010-10-29 17:14:30 +02001558 Enable AMD NUMA node topology detection. You should say Y here if
1559 you have a multi processor AMD system. This uses an old method to
1560 read the NUMA configuration directly from the builtin Northbridge
1561 of Opteron. It is recommended to use X86_64_ACPI_NUMA instead,
1562 which also takes priority if both are compiled in.
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001563
1564config X86_64_ACPI_NUMA
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001565 def_bool y
1566 prompt "ACPI NUMA detection"
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001567 depends on X86_64 && NUMA && ACPI && PCI
1568 select ACPI_NUMA
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001569 ---help---
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001570 Enable ACPI SRAT based node topology detection.
1571
Suresh Siddha6ec6e0d2008-03-25 10:14:35 -07001572# Some NUMA nodes have memory ranges that span
1573# other nodes. Even though a pfn is valid and
1574# between a node's start and end pfns, it may not
1575# reside on that node. See memmap_init_zone()
1576# for details.
1577config NODES_SPAN_OTHER_NODES
1578 def_bool y
1579 depends on X86_64_ACPI_NUMA
1580
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001581config NUMA_EMU
1582 bool "NUMA emulation"
Tejun Heo1b7e03e2011-05-02 17:24:48 +02001583 depends on NUMA
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001584 ---help---
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001585 Enable NUMA emulation. A flat machine will be split
1586 into virtual nodes when booted with "numa=fake=N", where N is the
1587 number of nodes. This is only useful for debugging.
1588
1589config NODES_SHIFT
Linus Torvaldsd25e26b2008-08-25 14:15:38 -07001590 int "Maximum NUMA Nodes (as a power of 2)" if !MAXSMP
David Rientjes51591e32010-03-25 15:39:27 -07001591 range 1 10
1592 default "10" if MAXSMP
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001593 default "6" if X86_64
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001594 default "3"
1595 depends on NEED_MULTIPLE_NODES
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001596 ---help---
Mike Travis1184dc22008-05-12 21:21:12 +02001597 Specify the maximum number of NUMA Nodes available on the target
Matt LaPlante692105b2009-01-26 11:12:25 +01001598 system. Increases memory reserved to accommodate various tables.
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001599
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001600config ARCH_HAVE_MEMORY_PRESENT
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001601 def_bool y
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001602 depends on X86_32 && DISCONTIGMEM
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001603
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001604config ARCH_FLATMEM_ENABLE
1605 def_bool y
Tejun Heo3b166512011-04-01 11:15:12 +02001606 depends on X86_32 && !NUMA
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001607
1608config ARCH_DISCONTIGMEM_ENABLE
1609 def_bool y
Christoph Lameterb2632952008-01-30 13:30:47 +01001610 depends on NUMA && X86_32
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001611
1612config ARCH_DISCONTIGMEM_DEFAULT
1613 def_bool y
Christoph Lameterb2632952008-01-30 13:30:47 +01001614 depends on NUMA && X86_32
1615
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001616config ARCH_SPARSEMEM_ENABLE
1617 def_bool y
Kees Cook6ea30382012-10-02 11:16:47 -07001618 depends on X86_64 || NUMA || X86_32 || X86_32_NON_STANDARD
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001619 select SPARSEMEM_STATIC if X86_32
1620 select SPARSEMEM_VMEMMAP_ENABLE if X86_64
1621
Tejun Heo3b166512011-04-01 11:15:12 +02001622config ARCH_SPARSEMEM_DEFAULT
1623 def_bool y
1624 depends on X86_64
1625
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001626config ARCH_SELECT_MEMORY_MODEL
1627 def_bool y
Christoph Lameterb2632952008-01-30 13:30:47 +01001628 depends on ARCH_SPARSEMEM_ENABLE
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001629
1630config ARCH_MEMORY_PROBE
Toshi Kania0842b72013-07-19 11:47:48 -06001631 bool "Enable sysfs memory/probe interface"
Jan Beulich3120e252012-09-10 12:41:45 +01001632 depends on X86_64 && MEMORY_HOTPLUG
Toshi Kania0842b72013-07-19 11:47:48 -06001633 help
1634 This option enables a sysfs memory/probe interface for testing.
1635 See Documentation/memory-hotplug.txt for more information.
1636 If you are unsure how to answer this question, answer N.
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001637
Tejun Heo3b166512011-04-01 11:15:12 +02001638config ARCH_PROC_KCORE_TEXT
1639 def_bool y
1640 depends on X86_64 && PROC_KCORE
1641
Avi Kivitya29815a2010-01-10 16:28:09 +02001642config ILLEGAL_POINTER_VALUE
1643 hex
1644 default 0 if X86_32
1645 default 0xdead000000000000 if X86_64
1646
Dan Williams7a678322015-08-19 00:34:34 -04001647config X86_PMEM_LEGACY_DEVICE
1648 bool
1649
Christoph Hellwigec776ef2015-04-01 09:12:18 +02001650config X86_PMEM_LEGACY
Dan Williams7a678322015-08-19 00:34:34 -04001651 tristate "Support non-standard NVDIMMs and ADR protected memory"
Dan Williams9f53f9f2015-06-09 15:33:45 -04001652 depends on PHYS_ADDR_T_64BIT
1653 depends on BLK_DEV
Dan Williams7a678322015-08-19 00:34:34 -04001654 select X86_PMEM_LEGACY_DEVICE
Dan Williams9f53f9f2015-06-09 15:33:45 -04001655 select LIBNVDIMM
Christoph Hellwigec776ef2015-04-01 09:12:18 +02001656 help
1657 Treat memory marked using the non-standard e820 type of 12 as used
1658 by the Intel Sandy Bridge-EP reference BIOS as protected memory.
1659 The kernel will offer these regions to the 'pmem' driver so
1660 they can be used for persistent storage.
1661
1662 Say Y if unsure.
1663
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001664config HIGHPTE
1665 bool "Allocate 3rd-level pagetables from highmem"
Jan Beulich6fc108a2010-04-21 15:23:44 +01001666 depends on HIGHMEM
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001667 ---help---
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001668 The VM uses one page table entry for each page of physical memory.
1669 For systems with a lot of RAM, this can be wasteful of precious
1670 low memory. Setting this option will put user-space page table
1671 entries in high memory.
1672
Jeremy Fitzhardinge9f077872008-09-07 01:51:34 -07001673config X86_CHECK_BIOS_CORRUPTION
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001674 bool "Check for low memory corruption"
1675 ---help---
1676 Periodically check for memory corruption in low memory, which
1677 is suspected to be caused by BIOS. Even when enabled in the
1678 configuration, it is disabled at runtime. Enable it by
1679 setting "memory_corruption_check=1" on the kernel command
1680 line. By default it scans the low 64k of memory every 60
1681 seconds; see the memory_corruption_check_size and
1682 memory_corruption_check_period parameters in
Mauro Carvalho Chehab8c27ceff32016-10-18 10:12:27 -02001683 Documentation/admin-guide/kernel-parameters.rst to adjust this.
Jeremy Fitzhardinge9f077872008-09-07 01:51:34 -07001684
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001685 When enabled with the default parameters, this option has
1686 almost no overhead, as it reserves a relatively small amount
1687 of memory and scans it infrequently. It both detects corruption
1688 and prevents it from affecting the running system.
Jeremy Fitzhardinge9f077872008-09-07 01:51:34 -07001689
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001690 It is, however, intended as a diagnostic tool; if repeatable
1691 BIOS-originated corruption always affects the same memory,
1692 you can use memmap= to prevent the kernel from using that
1693 memory.
Jeremy Fitzhardinge9f077872008-09-07 01:51:34 -07001694
Jeremy Fitzhardingec885df52008-09-07 02:37:32 -07001695config X86_BOOTPARAM_MEMORY_CORRUPTION_CHECK
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001696 bool "Set the default setting of memory_corruption_check"
Jeremy Fitzhardingec885df52008-09-07 02:37:32 -07001697 depends on X86_CHECK_BIOS_CORRUPTION
1698 default y
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001699 ---help---
1700 Set whether the default state of memory_corruption_check is
1701 on or off.
Jeremy Fitzhardingec885df52008-09-07 02:37:32 -07001702
H. Peter Anvin9ea77bd2010-08-25 16:38:20 -07001703config X86_RESERVE_LOW
H. Peter Anvind0cd7422010-08-24 17:32:04 -07001704 int "Amount of low memory, in kilobytes, to reserve for the BIOS"
1705 default 64
1706 range 4 640
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001707 ---help---
H. Peter Anvind0cd7422010-08-24 17:32:04 -07001708 Specify the amount of low memory to reserve for the BIOS.
Ingo Molnarfc381512008-09-16 10:07:34 +02001709
H. Peter Anvind0cd7422010-08-24 17:32:04 -07001710 The first page contains BIOS data structures that the kernel
1711 must not use, so that page must always be reserved.
Ingo Molnarfc381512008-09-16 10:07:34 +02001712
H. Peter Anvind0cd7422010-08-24 17:32:04 -07001713 By default we reserve the first 64K of physical RAM, as a
1714 number of BIOSes are known to corrupt that memory range
1715 during events such as suspend/resume or monitor cable
1716 insertion, so it must not be used by the kernel.
Ingo Molnarfc381512008-09-16 10:07:34 +02001717
H. Peter Anvind0cd7422010-08-24 17:32:04 -07001718 You can set this to 4 if you are absolutely sure that you
1719 trust the BIOS to get all its memory reservations and usages
1720 right. If you know your BIOS have problems beyond the
1721 default 64K area, you can set this to 640 to avoid using the
1722 entire low memory range.
1723
1724 If you have doubts about the BIOS (e.g. suspend/resume does
1725 not work or there's kernel crashes after certain hardware
1726 hotplug events) then you might want to enable
1727 X86_CHECK_BIOS_CORRUPTION=y to allow the kernel to check
1728 typical corruption patterns.
1729
1730 Leave this to the default value of 64 if you are unsure.
Ingo Molnarfc381512008-09-16 10:07:34 +02001731
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001732config MATH_EMULATION
1733 bool
Andy Lutomirskia5b9e5a2015-07-30 14:31:34 -07001734 depends on MODIFY_LDT_SYSCALL
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001735 prompt "Math emulation" if X86_32
1736 ---help---
1737 Linux can emulate a math coprocessor (used for floating point
1738 operations) if you don't have one. 486DX and Pentium processors have
1739 a math coprocessor built in, 486SX and 386 do not, unless you added
1740 a 487DX or 387, respectively. (The messages during boot time can
1741 give you some hints here ["man dmesg"].) Everyone needs either a
1742 coprocessor or this emulation.
1743
1744 If you don't have a math coprocessor, you need to say Y here; if you
1745 say Y here even though you have a coprocessor, the coprocessor will
1746 be used nevertheless. (This behavior can be changed with the kernel
1747 command line option "no387", which comes handy if your coprocessor
1748 is broken. Try "man bootparam" or see the documentation of your boot
1749 loader (lilo or loadlin) about how to pass options to the kernel at
1750 boot time.) This means that it is a good idea to say Y here if you
1751 intend to use this kernel on different machines.
1752
1753 More information about the internals of the Linux math coprocessor
1754 emulation can be found in <file:arch/x86/math-emu/README>.
1755
1756 If you are not sure, say Y; apart from resulting in a 66 KB bigger
1757 kernel, it won't hurt.
1758
1759config MTRR
Jan Beulich6fc108a2010-04-21 15:23:44 +01001760 def_bool y
David Rientjes6a108a12011-01-20 14:44:16 -08001761 prompt "MTRR (Memory Type Range Register) support" if EXPERT
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001762 ---help---
1763 On Intel P6 family processors (Pentium Pro, Pentium II and later)
1764 the Memory Type Range Registers (MTRRs) may be used to control
1765 processor access to memory ranges. This is most useful if you have
1766 a video (VGA) card on a PCI or AGP bus. Enabling write-combining
1767 allows bus write transfers to be combined into a larger transfer
1768 before bursting over the PCI/AGP bus. This can increase performance
1769 of image write operations 2.5 times or more. Saying Y here creates a
1770 /proc/mtrr file which may be used to manipulate your processor's
1771 MTRRs. Typically the X server should use this.
1772
1773 This code has a reasonably generic interface so that similar
1774 control registers on other processors can be easily supported
1775 as well:
1776
1777 The Cyrix 6x86, 6x86MX and M II processors have Address Range
1778 Registers (ARRs) which provide a similar functionality to MTRRs. For
1779 these, the ARRs are used to emulate the MTRRs.
1780 The AMD K6-2 (stepping 8 and above) and K6-3 processors have two
1781 MTRRs. The Centaur C6 (WinChip) has 8 MCRs, allowing
1782 write-combining. All of these processors are supported by this code
1783 and it makes sense to say Y here if you have one of them.
1784
1785 Saying Y here also fixes a problem with buggy SMP BIOSes which only
1786 set the MTRRs for the boot CPU and not for the secondary CPUs. This
1787 can lead to all sorts of problems, so it's good to say Y here.
1788
1789 You can safely say Y even if your machine doesn't have MTRRs, you'll
1790 just add about 9 KB to your kernel.
1791
Randy Dunlap7225e752008-07-26 17:54:22 -07001792 See <file:Documentation/x86/mtrr.txt> for more information.
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001793
Yinghai Lu95ffa242008-04-29 03:52:33 -07001794config MTRR_SANITIZER
Yinghai Lu2ffb3502008-09-30 16:29:40 -07001795 def_bool y
Yinghai Lu95ffa242008-04-29 03:52:33 -07001796 prompt "MTRR cleanup support"
1797 depends on MTRR
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001798 ---help---
Thomas Gleixneraba37282008-07-15 14:48:48 +02001799 Convert MTRR layout from continuous to discrete, so X drivers can
1800 add writeback entries.
Yinghai Lu95ffa242008-04-29 03:52:33 -07001801
Thomas Gleixneraba37282008-07-15 14:48:48 +02001802 Can be disabled with disable_mtrr_cleanup on the kernel command line.
Matt LaPlante692105b2009-01-26 11:12:25 +01001803 The largest mtrr entry size for a continuous block can be set with
Thomas Gleixneraba37282008-07-15 14:48:48 +02001804 mtrr_chunk_size.
Yinghai Lu95ffa242008-04-29 03:52:33 -07001805
Yinghai Lu2ffb3502008-09-30 16:29:40 -07001806 If unsure, say Y.
Yinghai Lu95ffa242008-04-29 03:52:33 -07001807
1808config MTRR_SANITIZER_ENABLE_DEFAULT
Yinghai Luf5098d62008-04-29 20:25:58 -07001809 int "MTRR cleanup enable value (0-1)"
1810 range 0 1
1811 default "0"
Yinghai Lu95ffa242008-04-29 03:52:33 -07001812 depends on MTRR_SANITIZER
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001813 ---help---
Yinghai Luf5098d62008-04-29 20:25:58 -07001814 Enable mtrr cleanup default value
Yinghai Lu95ffa242008-04-29 03:52:33 -07001815
Yinghai Lu12031a62008-05-02 02:40:22 -07001816config MTRR_SANITIZER_SPARE_REG_NR_DEFAULT
1817 int "MTRR cleanup spare reg num (0-7)"
1818 range 0 7
1819 default "1"
1820 depends on MTRR_SANITIZER
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001821 ---help---
Yinghai Lu12031a62008-05-02 02:40:22 -07001822 mtrr cleanup spare entries default, it can be changed via
Thomas Gleixneraba37282008-07-15 14:48:48 +02001823 mtrr_spare_reg_nr=N on the kernel command line.
Yinghai Lu12031a62008-05-02 02:40:22 -07001824
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001825config X86_PAT
Jan Beulich6fc108a2010-04-21 15:23:44 +01001826 def_bool y
David Rientjes6a108a12011-01-20 14:44:16 -08001827 prompt "x86 PAT support" if EXPERT
Ingo Molnar2a8a2712008-04-26 10:26:52 +02001828 depends on MTRR
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001829 ---help---
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001830 Use PAT attributes to setup page level cache control.
Venki Pallipadi042b78e2008-03-24 14:22:35 -07001831
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001832 PATs are the modern equivalents of MTRRs and are much more
1833 flexible than MTRRs.
1834
1835 Say N here if you see bootup problems (boot crash, boot hang,
Venki Pallipadi042b78e2008-03-24 14:22:35 -07001836 spontaneous reboots) or a non-working video driver.
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001837
1838 If unsure, say Y.
1839
Venkatesh Pallipadi46cf98c2009-07-10 09:57:37 -07001840config ARCH_USES_PG_UNCACHED
1841 def_bool y
1842 depends on X86_PAT
1843
H. Peter Anvin628c6242011-07-31 13:59:29 -07001844config ARCH_RANDOM
1845 def_bool y
1846 prompt "x86 architectural random number generator" if EXPERT
1847 ---help---
1848 Enable the x86 architectural RDRAND instruction
1849 (Intel Bull Mountain technology) to generate random numbers.
1850 If supported, this is a high bandwidth, cryptographically
1851 secure hardware random number generator.
1852
H. Peter Anvin51ae4a22012-09-21 12:43:10 -07001853config X86_SMAP
1854 def_bool y
1855 prompt "Supervisor Mode Access Prevention" if EXPERT
1856 ---help---
1857 Supervisor Mode Access Prevention (SMAP) is a security
1858 feature in newer Intel processors. There is a small
1859 performance cost if this enabled and turned on; there is
1860 also a small increase in the kernel size if this is enabled.
1861
1862 If unsure, say Y.
1863
Ricardo Neriaa35f892017-11-05 18:27:54 -08001864config X86_INTEL_UMIP
Ricardo Neri796ebc82017-11-13 22:29:42 -08001865 def_bool y
Ricardo Neriaa35f892017-11-05 18:27:54 -08001866 depends on CPU_SUP_INTEL
1867 prompt "Intel User Mode Instruction Prevention" if EXPERT
1868 ---help---
1869 The User Mode Instruction Prevention (UMIP) is a security
1870 feature in newer Intel processors. If enabled, a general
Ricardo Neri796ebc82017-11-13 22:29:42 -08001871 protection fault is issued if the SGDT, SLDT, SIDT, SMSW
1872 or STR instructions are executed in user mode. These instructions
1873 unnecessarily expose information about the hardware state.
1874
1875 The vast majority of applications do not use these instructions.
1876 For the very few that do, software emulation is provided in
1877 specific cases in protected and virtual-8086 modes. Emulated
1878 results are dummy.
Ricardo Neriaa35f892017-11-05 18:27:54 -08001879
Dave Hansen72e9b5f2014-12-12 10:38:36 -08001880config X86_INTEL_MPX
1881 prompt "Intel MPX (Memory Protection Extensions)"
1882 def_bool n
Rik van Rieldf3735c2017-09-06 16:25:11 -07001883 # Note: only available in 64-bit mode due to VMA flags shortage
1884 depends on CPU_SUP_INTEL && X86_64
1885 select ARCH_USES_HIGH_VMA_FLAGS
Dave Hansen72e9b5f2014-12-12 10:38:36 -08001886 ---help---
1887 MPX provides hardware features that can be used in
1888 conjunction with compiler-instrumented code to check
1889 memory references. It is designed to detect buffer
1890 overflow or underflow bugs.
1891
1892 This option enables running applications which are
1893 instrumented or otherwise use MPX. It does not use MPX
1894 itself inside the kernel or to protect the kernel
1895 against bad memory references.
1896
1897 Enabling this option will make the kernel larger:
1898 ~8k of kernel text and 36 bytes of data on a 64-bit
1899 defconfig. It adds a long to the 'mm_struct' which
1900 will increase the kernel memory overhead of each
1901 process and adds some branches to paths used during
1902 exec() and munmap().
1903
1904 For details, see Documentation/x86/intel_mpx.txt
1905
1906 If unsure, say N.
1907
Dave Hansen35e97792016-02-12 13:02:00 -08001908config X86_INTEL_MEMORY_PROTECTION_KEYS
Dave Hansen284244a2016-02-12 13:02:28 -08001909 prompt "Intel Memory Protection Keys"
Dave Hansen35e97792016-02-12 13:02:00 -08001910 def_bool y
Dave Hansen284244a2016-02-12 13:02:28 -08001911 # Note: only available in 64-bit mode
Dave Hansen35e97792016-02-12 13:02:00 -08001912 depends on CPU_SUP_INTEL && X86_64
Ingo Molnar52c8e602016-11-15 10:15:03 +01001913 select ARCH_USES_HIGH_VMA_FLAGS
1914 select ARCH_HAS_PKEYS
Dave Hansen284244a2016-02-12 13:02:28 -08001915 ---help---
1916 Memory Protection Keys provides a mechanism for enforcing
1917 page-based protections, but without requiring modification of the
1918 page tables when an application changes protection domains.
1919
1920 For details, see Documentation/x86/protection-keys.txt
1921
1922 If unsure, say y.
Dave Hansen35e97792016-02-12 13:02:00 -08001923
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001924config EFI
Jan Beulich9ba16082008-10-15 22:01:38 -07001925 bool "EFI runtime service support"
Huang, Ying5b836832008-01-30 13:31:19 +01001926 depends on ACPI
Sergey Vlasovf6ce5002013-04-16 18:31:08 +04001927 select UCS2_STRING
Ard Biesheuvel022ee6c2014-06-26 12:09:05 +02001928 select EFI_RUNTIME_WRAPPERS
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001929 ---help---
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001930 This enables the kernel to use EFI runtime services that are
1931 available (such as the EFI variable services).
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001932
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001933 This option is only useful on systems that have EFI firmware.
1934 In addition, you should use the latest ELILO loader available
1935 at <http://elilo.sourceforge.net> in order to take advantage
1936 of EFI runtime services. However, even with this option, the
1937 resultant kernel should continue to boot on existing non-EFI
1938 platforms.
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001939
Matt Fleming291f3632011-12-12 21:27:52 +00001940config EFI_STUB
1941 bool "EFI stub support"
Matt Flemingb16d8c22014-08-05 00:12:19 +01001942 depends on EFI && !X86_USE_3DNOW
Matt Fleming7b2a5832014-07-11 08:45:25 +01001943 select RELOCATABLE
Matt Fleming291f3632011-12-12 21:27:52 +00001944 ---help---
1945 This kernel feature allows a bzImage to be loaded directly
1946 by EFI firmware without the use of a bootloader.
1947
Roy Franz4172fe22013-09-22 15:45:25 -07001948 See Documentation/efi-stub.txt for more information.
Matt Fleming0c759662012-03-16 12:03:13 +00001949
Matt Fleming7d453ee2014-01-10 18:52:06 +00001950config EFI_MIXED
1951 bool "EFI mixed-mode support"
1952 depends on EFI_STUB && X86_64
1953 ---help---
1954 Enabling this feature allows a 64-bit kernel to be booted
1955 on a 32-bit firmware, provided that your CPU supports 64-bit
1956 mode.
1957
1958 Note that it is not possible to boot a mixed-mode enabled
1959 kernel via the EFI boot stub - a bootloader that supports
1960 the EFI handover protocol must be used.
1961
1962 If unsure, say N.
1963
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001964config SECCOMP
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001965 def_bool y
1966 prompt "Enable seccomp to safely compute untrusted bytecode"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001967 ---help---
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001968 This kernel feature is useful for number crunching applications
1969 that may need to compute untrusted bytecode during their
1970 execution. By using pipes or other transports made available to
1971 the process as file descriptors supporting the read/write
1972 syscalls, it's possible to isolate those applications in
1973 their own address space using seccomp. Once seccomp is
Alexey Dobriyan9c0bbee2008-09-09 11:01:31 +04001974 enabled via prctl(PR_SET_SECCOMP), it cannot be disabled
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001975 and the task is only allowed to execute a few safe syscalls
1976 defined by each seccomp mode.
1977
1978 If unsure, say Y. Only embedded should say N here.
1979
Masahiro Yamada8636a1f2018-12-11 20:01:04 +09001980source "kernel/Kconfig.hz"
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001981
1982config KEXEC
1983 bool "kexec system call"
Dave Young2965faa2015-09-09 15:38:55 -07001984 select KEXEC_CORE
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001985 ---help---
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001986 kexec is a system call that implements the ability to shutdown your
1987 current kernel, and to start another kernel. It is like a reboot
1988 but it is independent of the system firmware. And like a reboot
1989 you can start any kernel with it, not just Linux.
1990
1991 The name comes from the similarity to the exec system call.
1992
1993 It is an ongoing process to be certain the hardware in a machine
1994 is properly shutdown, so do not be surprised if this code does not
Geert Uytterhoevenbf220692013-08-20 21:38:03 +02001995 initially work for you. As of this writing the exact hardware
1996 interface is strongly in flux, so no good recommendation can be
1997 made.
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001998
Vivek Goyal74ca3172014-08-29 15:18:46 -07001999config KEXEC_FILE
2000 bool "kexec file based system call"
Dave Young2965faa2015-09-09 15:38:55 -07002001 select KEXEC_CORE
Vivek Goyal74ca3172014-08-29 15:18:46 -07002002 select BUILD_BIN2C
Vivek Goyal74ca3172014-08-29 15:18:46 -07002003 depends on X86_64
2004 depends on CRYPTO=y
2005 depends on CRYPTO_SHA256=y
2006 ---help---
2007 This is new version of kexec system call. This system call is
2008 file based and takes file descriptors as system call argument
2009 for kernel and initramfs as opposed to list of segments as
2010 accepted by previous system call.
2011
AKASHI Takahirob799a092018-04-13 15:35:45 -07002012config ARCH_HAS_KEXEC_PURGATORY
2013 def_bool KEXEC_FILE
2014
Vivek Goyal8e7d8382014-08-08 14:26:13 -07002015config KEXEC_VERIFY_SIG
2016 bool "Verify kernel signature during kexec_file_load() syscall"
Vivek Goyal74ca3172014-08-29 15:18:46 -07002017 depends on KEXEC_FILE
Vivek Goyal8e7d8382014-08-08 14:26:13 -07002018 ---help---
2019 This option makes kernel signature verification mandatory for
Borislav Petkovd8eb8942015-03-13 14:04:37 +01002020 the kexec_file_load() syscall.
Vivek Goyal8e7d8382014-08-08 14:26:13 -07002021
Borislav Petkovd8eb8942015-03-13 14:04:37 +01002022 In addition to that option, you need to enable signature
2023 verification for the corresponding kernel image type being
2024 loaded in order for this to work.
Vivek Goyal8e7d8382014-08-08 14:26:13 -07002025
2026config KEXEC_BZIMAGE_VERIFY_SIG
2027 bool "Enable bzImage signature verification support"
2028 depends on KEXEC_VERIFY_SIG
2029 depends on SIGNED_PE_FILE_VERIFICATION
2030 select SYSTEM_TRUSTED_KEYRING
2031 ---help---
2032 Enable bzImage signature verification support.
2033
Sam Ravnborg506f1d072007-11-09 21:56:54 +01002034config CRASH_DUMP
Pavel Machek04b69442008-08-14 17:16:50 +02002035 bool "kernel crash dumps"
Sam Ravnborg506f1d072007-11-09 21:56:54 +01002036 depends on X86_64 || (X86_32 && HIGHMEM)
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002037 ---help---
Sam Ravnborg506f1d072007-11-09 21:56:54 +01002038 Generate crash dump after being started by kexec.
2039 This should be normally only set in special crash dump kernels
2040 which are loaded in the main kernel with kexec-tools into
2041 a specially reserved region and then later executed after
2042 a crash by kdump/kexec. The crash dump kernel must be compiled
2043 to a memory address not used by the main kernel or BIOS using
2044 PHYSICAL_START, or it must be built as a relocatable image
2045 (CONFIG_RELOCATABLE=y).
2046 For more details see Documentation/kdump/kdump.txt
2047
Huang Ying3ab83522008-07-25 19:45:07 -07002048config KEXEC_JUMP
Kees Cook6ea30382012-10-02 11:16:47 -07002049 bool "kexec jump"
Huang Yingfee7b0d2009-03-10 10:57:16 +08002050 depends on KEXEC && HIBERNATION
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002051 ---help---
Huang Ying89081d12008-07-25 19:45:10 -07002052 Jump between original kernel and kexeced kernel and invoke
2053 code in physical address mode via KEXEC
Huang Ying3ab83522008-07-25 19:45:07 -07002054
Sam Ravnborg506f1d072007-11-09 21:56:54 +01002055config PHYSICAL_START
David Rientjes6a108a12011-01-20 14:44:16 -08002056 hex "Physical address where the kernel is loaded" if (EXPERT || CRASH_DUMP)
H. Peter Anvinceefccc2009-05-11 16:12:16 -07002057 default "0x1000000"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002058 ---help---
Sam Ravnborg506f1d072007-11-09 21:56:54 +01002059 This gives the physical address where the kernel is loaded.
2060
2061 If kernel is a not relocatable (CONFIG_RELOCATABLE=n) then
2062 bzImage will decompress itself to above physical address and
2063 run from there. Otherwise, bzImage will run from the address where
2064 it has been loaded by the boot loader and will ignore above physical
2065 address.
2066
2067 In normal kdump cases one does not have to set/change this option
2068 as now bzImage can be compiled as a completely relocatable image
2069 (CONFIG_RELOCATABLE=y) and be used to load and run from a different
2070 address. This option is mainly useful for the folks who don't want
2071 to use a bzImage for capturing the crash dump and want to use a
2072 vmlinux instead. vmlinux is not relocatable hence a kernel needs
2073 to be specifically compiled to run from a specific memory area
2074 (normally a reserved region) and this option comes handy.
2075
H. Peter Anvinceefccc2009-05-11 16:12:16 -07002076 So if you are using bzImage for capturing the crash dump,
2077 leave the value here unchanged to 0x1000000 and set
2078 CONFIG_RELOCATABLE=y. Otherwise if you plan to use vmlinux
2079 for capturing the crash dump change this value to start of
2080 the reserved region. In other words, it can be set based on
2081 the "X" value as specified in the "crashkernel=YM@XM"
2082 command line boot parameter passed to the panic-ed
2083 kernel. Please take a look at Documentation/kdump/kdump.txt
2084 for more details about crash dumps.
Sam Ravnborg506f1d072007-11-09 21:56:54 +01002085
2086 Usage of bzImage for capturing the crash dump is recommended as
2087 one does not have to build two kernels. Same kernel can be used
2088 as production kernel and capture kernel. Above option should have
2089 gone away after relocatable bzImage support is introduced. But it
2090 is present because there are users out there who continue to use
2091 vmlinux for dump capture. This option should go away down the
2092 line.
2093
2094 Don't change this unless you know what you are doing.
2095
2096config RELOCATABLE
H. Peter Anvin26717802009-05-07 14:19:34 -07002097 bool "Build a relocatable kernel"
2098 default y
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002099 ---help---
Sam Ravnborg506f1d072007-11-09 21:56:54 +01002100 This builds a kernel image that retains relocation information
2101 so it can be loaded someplace besides the default 1MB.
2102 The relocations tend to make the kernel binary about 10% larger,
2103 but are discarded at runtime.
2104
2105 One use is for the kexec on panic case where the recovery kernel
2106 must live at a different physical address than the primary
2107 kernel.
2108
2109 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
2110 it has been loaded at and the compile time physical address
Kees Cook8ab38202013-10-10 17:18:14 -07002111 (CONFIG_PHYSICAL_START) is used as the minimum location.
Sam Ravnborg506f1d072007-11-09 21:56:54 +01002112
Kees Cook8ab38202013-10-10 17:18:14 -07002113config RANDOMIZE_BASE
Baoquan Hee8581e32016-04-20 13:55:43 -07002114 bool "Randomize the address of the kernel image (KASLR)"
Kees Cook8ab38202013-10-10 17:18:14 -07002115 depends on RELOCATABLE
Ingo Molnar6807c842017-04-18 11:08:12 +02002116 default y
Kees Cook8ab38202013-10-10 17:18:14 -07002117 ---help---
Baoquan Hee8581e32016-04-20 13:55:43 -07002118 In support of Kernel Address Space Layout Randomization (KASLR),
2119 this randomizes the physical address at which the kernel image
2120 is decompressed and the virtual address where the kernel
2121 image is mapped, as a security feature that deters exploit
2122 attempts relying on knowledge of the location of kernel
2123 code internals.
Kees Cook8ab38202013-10-10 17:18:14 -07002124
Kees Cooked9f0072016-05-25 15:45:33 -07002125 On 64-bit, the kernel physical and virtual addresses are
2126 randomized separately. The physical address will be anywhere
2127 between 16MB and the top of physical memory (up to 64TB). The
2128 virtual address will be randomized from 16MB up to 1GB (9 bits
2129 of entropy). Note that this also reduces the memory space
2130 available to kernel modules from 1.5GB to 1GB.
2131
2132 On 32-bit, the kernel physical and virtual addresses are
2133 randomized together. They will be randomized from 16MB up to
2134 512MB (8 bits of entropy).
Kees Cook8ab38202013-10-10 17:18:14 -07002135
Baoquan Hee8581e32016-04-20 13:55:43 -07002136 Entropy is generated using the RDRAND instruction if it is
2137 supported. If RDTSC is supported, its value is mixed into
2138 the entropy pool as well. If neither RDRAND nor RDTSC are
Kees Cooked9f0072016-05-25 15:45:33 -07002139 supported, then entropy is read from the i8254 timer. The
2140 usable entropy is limited by the kernel being built using
2141 2GB addressing, and that PHYSICAL_ALIGN must be at a
2142 minimum of 2MB. As a result, only 10 bits of entropy are
2143 theoretically possible, but the implementations are further
2144 limited due to memory layouts.
Kees Cookda2b6fb2013-12-10 12:27:45 -08002145
Ingo Molnar6807c842017-04-18 11:08:12 +02002146 If unsure, say Y.
Kees Cook8ab38202013-10-10 17:18:14 -07002147
2148# Relocation on x86 needs some additional build support
H. Peter Anvin845adf72009-05-05 21:20:51 -07002149config X86_NEED_RELOCS
2150 def_bool y
Kees Cook8ab38202013-10-10 17:18:14 -07002151 depends on RANDOMIZE_BASE || (X86_32 && RELOCATABLE)
H. Peter Anvin845adf72009-05-05 21:20:51 -07002152
Sam Ravnborg506f1d072007-11-09 21:56:54 +01002153config PHYSICAL_ALIGN
Kees Cooka0215062013-07-08 09:15:17 -07002154 hex "Alignment value to which kernel should be aligned"
Kees Cook8ab38202013-10-10 17:18:14 -07002155 default "0x200000"
Kees Cooka0215062013-07-08 09:15:17 -07002156 range 0x2000 0x1000000 if X86_32
2157 range 0x200000 0x1000000 if X86_64
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002158 ---help---
Sam Ravnborg506f1d072007-11-09 21:56:54 +01002159 This value puts the alignment restrictions on physical address
2160 where kernel is loaded and run from. Kernel is compiled for an
2161 address which meets above alignment restriction.
2162
2163 If bootloader loads the kernel at a non-aligned address and
2164 CONFIG_RELOCATABLE is set, kernel will move itself to nearest
2165 address aligned to above value and run from there.
2166
2167 If bootloader loads the kernel at a non-aligned address and
2168 CONFIG_RELOCATABLE is not set, kernel will ignore the run time
2169 load address and decompress itself to the address it has been
2170 compiled for and run from there. The address for which kernel is
2171 compiled already meets above alignment restrictions. Hence the
2172 end result is that kernel runs from a physical address meeting
2173 above alignment restrictions.
2174
Kees Cooka0215062013-07-08 09:15:17 -07002175 On 32-bit this value must be a multiple of 0x2000. On 64-bit
2176 this value must be a multiple of 0x200000.
2177
Sam Ravnborg506f1d072007-11-09 21:56:54 +01002178 Don't change this unless you know what you are doing.
2179
Kirill A. Shutemoveedb92a2018-02-14 14:16:50 +03002180config DYNAMIC_MEMORY_LAYOUT
2181 bool
2182 ---help---
2183 This option makes base addresses of vmalloc and vmemmap as well as
2184 __PAGE_OFFSET movable during boot.
2185
Thomas Garnier0483e1f2016-06-21 17:47:02 -07002186config RANDOMIZE_MEMORY
2187 bool "Randomize the kernel memory sections"
2188 depends on X86_64
2189 depends on RANDOMIZE_BASE
Kirill A. Shutemoveedb92a2018-02-14 14:16:50 +03002190 select DYNAMIC_MEMORY_LAYOUT
Thomas Garnier0483e1f2016-06-21 17:47:02 -07002191 default RANDOMIZE_BASE
2192 ---help---
2193 Randomizes the base virtual address of kernel memory sections
2194 (physical memory mapping, vmalloc & vmemmap). This security feature
2195 makes exploits relying on predictable memory locations less reliable.
2196
2197 The order of allocations remains unchanged. Entropy is generated in
2198 the same way as RANDOMIZE_BASE. Current implementation in the optimal
2199 configuration have in average 30,000 different possible virtual
2200 addresses for each memory section.
2201
Ingo Molnar6807c842017-04-18 11:08:12 +02002202 If unsure, say Y.
Thomas Garnier0483e1f2016-06-21 17:47:02 -07002203
Thomas Garnier90397a42016-06-21 17:47:06 -07002204config RANDOMIZE_MEMORY_PHYSICAL_PADDING
2205 hex "Physical memory mapping padding" if EXPERT
2206 depends on RANDOMIZE_MEMORY
2207 default "0xa" if MEMORY_HOTPLUG
2208 default "0x0"
2209 range 0x1 0x40 if MEMORY_HOTPLUG
2210 range 0x0 0x40
2211 ---help---
2212 Define the padding in terabytes added to the existing physical
2213 memory size during kernel memory randomization. It is useful
2214 for memory hotplug support but reduces the entropy available for
2215 address randomization.
2216
2217 If unsure, leave at the default value.
2218
Sam Ravnborg506f1d072007-11-09 21:56:54 +01002219config HOTPLUG_CPU
Thomas Gleixnerbebd0242019-03-26 17:36:06 +01002220 def_bool y
Stephen Rothwell40b31362013-05-21 13:49:35 +10002221 depends on SMP
Sam Ravnborg506f1d072007-11-09 21:56:54 +01002222
Fenghua Yu80aa1df2012-11-13 11:32:39 -08002223config BOOTPARAM_HOTPLUG_CPU0
2224 bool "Set default setting of cpu0_hotpluggable"
Kees Cook2c922cd2013-01-22 13:01:19 -08002225 depends on HOTPLUG_CPU
Fenghua Yu80aa1df2012-11-13 11:32:39 -08002226 ---help---
2227 Set whether default state of cpu0_hotpluggable is on or off.
2228
2229 Say Y here to enable CPU0 hotplug by default. If this switch
2230 is turned on, there is no need to give cpu0_hotplug kernel
2231 parameter and the CPU0 hotplug feature is enabled by default.
2232
2233 Please note: there are two known CPU0 dependencies if you want
2234 to enable the CPU0 hotplug feature either by this switch or by
2235 cpu0_hotplug kernel parameter.
2236
2237 First, resume from hibernate or suspend always starts from CPU0.
2238 So hibernate and suspend are prevented if CPU0 is offline.
2239
2240 Second dependency is PIC interrupts always go to CPU0. CPU0 can not
2241 offline if any interrupt can not migrate out of CPU0. There may
2242 be other CPU0 dependencies.
2243
2244 Please make sure the dependencies are under your control before
2245 you enable this feature.
2246
2247 Say N if you don't want to enable CPU0 hotplug feature by default.
2248 You still can enable the CPU0 hotplug feature at boot by kernel
2249 parameter cpu0_hotplug.
2250
Fenghua Yua71c8bc2012-11-13 11:32:51 -08002251config DEBUG_HOTPLUG_CPU0
2252 def_bool n
2253 prompt "Debug CPU0 hotplug"
Kees Cook2c922cd2013-01-22 13:01:19 -08002254 depends on HOTPLUG_CPU
Fenghua Yua71c8bc2012-11-13 11:32:51 -08002255 ---help---
2256 Enabling this option offlines CPU0 (if CPU0 can be offlined) as
2257 soon as possible and boots up userspace with CPU0 offlined. User
2258 can online CPU0 back after boot time.
2259
2260 To debug CPU0 hotplug, you need to enable CPU0 offline/online
2261 feature by either turning on CONFIG_BOOTPARAM_HOTPLUG_CPU0 during
2262 compilation or giving cpu0_hotplug kernel parameter at boot.
2263
2264 If unsure, say N.
2265
Sam Ravnborg506f1d072007-11-09 21:56:54 +01002266config COMPAT_VDSO
Andy Lutomirskib0b49f22014-03-13 16:01:26 -07002267 def_bool n
2268 prompt "Disable the 32-bit vDSO (needed for glibc 2.3.3)"
Ingo Molnar953fee12016-11-15 10:22:52 +01002269 depends on COMPAT_32
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002270 ---help---
Andy Lutomirskib0b49f22014-03-13 16:01:26 -07002271 Certain buggy versions of glibc will crash if they are
2272 presented with a 32-bit vDSO that is not mapped at the address
2273 indicated in its segment table.
Randy Dunlape84446d2009-11-10 15:46:52 -08002274
Andy Lutomirskib0b49f22014-03-13 16:01:26 -07002275 The bug was introduced by f866314b89d56845f55e6f365e18b31ec978ec3a
2276 and fixed by 3b3ddb4f7db98ec9e912ccdf54d35df4aa30e04a and
2277 49ad572a70b8aeb91e57483a11dd1b77e31c4468. Glibc 2.3.3 is
2278 the only released version with the bug, but OpenSUSE 9
2279 contains a buggy "glibc 2.3.2".
Sam Ravnborg506f1d072007-11-09 21:56:54 +01002280
Andy Lutomirskib0b49f22014-03-13 16:01:26 -07002281 The symptom of the bug is that everything crashes on startup, saying:
2282 dl_main: Assertion `(void *) ph->p_vaddr == _rtld_local._dl_sysinfo_dso' failed!
2283
2284 Saying Y here changes the default value of the vdso32 boot
2285 option from 1 to 0, which turns off the 32-bit vDSO entirely.
2286 This works around the glibc bug but hurts performance.
2287
2288 If unsure, say N: if you are compiling your own kernel, you
2289 are unlikely to be using a buggy version of glibc.
Sam Ravnborg506f1d072007-11-09 21:56:54 +01002290
Kees Cook3dc33bd2015-08-12 17:55:19 -07002291choice
2292 prompt "vsyscall table for legacy applications"
2293 depends on X86_64
2294 default LEGACY_VSYSCALL_EMULATE
2295 help
2296 Legacy user code that does not know how to find the vDSO expects
2297 to be able to issue three syscalls by calling fixed addresses in
2298 kernel space. Since this location is not randomized with ASLR,
2299 it can be used to assist security vulnerability exploitation.
2300
2301 This setting can be changed at boot time via the kernel command
Andy Lutomirski076ca272018-03-07 11:12:27 -08002302 line parameter vsyscall=[emulate|none].
Kees Cook3dc33bd2015-08-12 17:55:19 -07002303
2304 On a system with recent enough glibc (2.14 or newer) and no
2305 static binaries, you can say None without a performance penalty
2306 to improve security.
2307
2308 If unsure, select "Emulate".
2309
Kees Cook3dc33bd2015-08-12 17:55:19 -07002310 config LEGACY_VSYSCALL_EMULATE
2311 bool "Emulate"
2312 help
2313 The kernel traps and emulates calls into the fixed
2314 vsyscall address mapping. This makes the mapping
2315 non-executable, but it still contains known contents,
2316 which could be used in certain rare security vulnerability
2317 exploits. This configuration is recommended when userspace
2318 still uses the vsyscall area.
2319
2320 config LEGACY_VSYSCALL_NONE
2321 bool "None"
2322 help
2323 There will be no vsyscall mapping at all. This will
2324 eliminate any risk of ASLR bypass due to the vsyscall
2325 fixed address mapping. Attempts to use the vsyscalls
2326 will be reported to dmesg, so that either old or
2327 malicious userspace programs can be identified.
2328
2329endchoice
2330
Tim Bird516cbf32008-08-12 12:52:36 -07002331config CMDLINE_BOOL
2332 bool "Built-in kernel command line"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002333 ---help---
Tim Bird516cbf32008-08-12 12:52:36 -07002334 Allow for specifying boot arguments to the kernel at
2335 build time. On some systems (e.g. embedded ones), it is
2336 necessary or convenient to provide some or all of the
2337 kernel boot arguments with the kernel itself (that is,
2338 to not rely on the boot loader to provide them.)
2339
2340 To compile command line arguments into the kernel,
2341 set this option to 'Y', then fill in the
Sébastien Hinderer69711ca2015-07-08 00:02:01 +02002342 boot arguments in CONFIG_CMDLINE.
Tim Bird516cbf32008-08-12 12:52:36 -07002343
2344 Systems with fully functional boot loaders (i.e. non-embedded)
2345 should leave this option set to 'N'.
2346
2347config CMDLINE
2348 string "Built-in kernel command string"
2349 depends on CMDLINE_BOOL
2350 default ""
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002351 ---help---
Tim Bird516cbf32008-08-12 12:52:36 -07002352 Enter arguments here that should be compiled into the kernel
2353 image and used at boot time. If the boot loader provides a
2354 command line at boot time, it is appended to this string to
2355 form the full kernel command line, when the system boots.
2356
2357 However, you can use the CONFIG_CMDLINE_OVERRIDE option to
2358 change this behavior.
2359
2360 In most cases, the command line (whether built-in or provided
2361 by the boot loader) should specify the device for the root
2362 file system.
2363
2364config CMDLINE_OVERRIDE
2365 bool "Built-in command line overrides boot loader arguments"
Tim Bird516cbf32008-08-12 12:52:36 -07002366 depends on CMDLINE_BOOL
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002367 ---help---
Tim Bird516cbf32008-08-12 12:52:36 -07002368 Set this option to 'Y' to have the kernel ignore the boot loader
2369 command line, and use ONLY the built-in command line.
2370
2371 This is used to work around broken boot loaders. This should
2372 be set to 'N' under normal conditions.
2373
Andy Lutomirskia5b9e5a2015-07-30 14:31:34 -07002374config MODIFY_LDT_SYSCALL
2375 bool "Enable the LDT (local descriptor table)" if EXPERT
2376 default y
2377 ---help---
2378 Linux can allow user programs to install a per-process x86
2379 Local Descriptor Table (LDT) using the modify_ldt(2) system
2380 call. This is required to run 16-bit or segmented code such as
2381 DOSEMU or some Wine programs. It is also used by some very old
2382 threading libraries.
2383
2384 Enabling this feature adds a small amount of overhead to
2385 context switches and increases the low-level kernel attack
2386 surface. Disabling it removes the modify_ldt(2) system call.
2387
2388 Saying 'N' here may make sense for embedded or server kernels.
2389
Seth Jenningsb700e7f2014-12-16 11:58:19 -06002390source "kernel/livepatch/Kconfig"
2391
Sam Ravnborg506f1d072007-11-09 21:56:54 +01002392endmenu
2393
Michal Hocko3072e412017-09-08 16:11:39 -07002394config ARCH_HAS_ADD_PAGES
2395 def_bool y
2396 depends on X86_64 && ARCH_ENABLE_MEMORY_HOTPLUG
2397
Sam Ravnborg506f1d072007-11-09 21:56:54 +01002398config ARCH_ENABLE_MEMORY_HOTPLUG
2399 def_bool y
2400 depends on X86_64 || (X86_32 && HIGHMEM)
2401
Gary Hade35551052008-10-31 10:52:03 -07002402config ARCH_ENABLE_MEMORY_HOTREMOVE
2403 def_bool y
2404 depends on MEMORY_HOTPLUG
2405
Lee Schermerhorne534c7c2010-05-26 14:44:58 -07002406config USE_PERCPU_NUMA_NODE_ID
Tejun Heo645a7912011-01-23 14:37:40 +01002407 def_bool y
Lee Schermerhorne534c7c2010-05-26 14:44:58 -07002408 depends on NUMA
2409
Kirill A. Shutemov94918462013-11-14 14:31:10 -08002410config ARCH_ENABLE_SPLIT_PMD_PTLOCK
2411 def_bool y
2412 depends on X86_64 || X86_PAE
2413
Naoya Horiguchic177c812014-06-04 16:05:35 -07002414config ARCH_ENABLE_HUGEPAGE_MIGRATION
2415 def_bool y
2416 depends on X86_64 && HUGETLB_PAGE && MIGRATION
2417
Naoya Horiguchi9c670ea2017-09-08 16:10:53 -07002418config ARCH_ENABLE_THP_MIGRATION
2419 def_bool y
2420 depends on X86_64 && TRANSPARENT_HUGEPAGE
2421
Bjorn Helgaasda85f862008-11-05 13:37:27 -06002422menu "Power management and ACPI options"
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002423
2424config ARCH_HIBERNATION_HEADER
Harvey Harrison3c2362e2008-01-30 13:31:03 +01002425 def_bool y
Zhimin Gu44556532018-09-21 14:27:29 +08002426 depends on HIBERNATION
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002427
2428source "kernel/power/Kconfig"
2429
2430source "drivers/acpi/Kconfig"
2431
Feng Tangefafc8b2009-08-14 15:23:29 -04002432source "drivers/sfi/Kconfig"
2433
Andi Kleena6b68072008-01-30 13:32:49 +01002434config X86_APM_BOOT
Jan Beulich6fc108a2010-04-21 15:23:44 +01002435 def_bool y
Paul Bolle282e5aa2011-11-17 11:41:31 +01002436 depends on APM
Andi Kleena6b68072008-01-30 13:32:49 +01002437
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002438menuconfig APM
2439 tristate "APM (Advanced Power Management) BIOS support"
Ingo Molnarefefa6f2008-07-10 16:09:50 +02002440 depends on X86_32 && PM_SLEEP
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002441 ---help---
2442 APM is a BIOS specification for saving power using several different
2443 techniques. This is mostly useful for battery powered laptops with
2444 APM compliant BIOSes. If you say Y here, the system time will be
2445 reset after a RESUME operation, the /proc/apm device will provide
2446 battery status information, and user-space programs will receive
2447 notification of APM "events" (e.g. battery status change).
2448
2449 If you select "Y" here, you can disable actual use of the APM
2450 BIOS by passing the "apm=off" option to the kernel at boot time.
2451
2452 Note that the APM support is almost completely disabled for
2453 machines with more than one CPU.
2454
2455 In order to use APM, you will need supporting software. For location
Michael Witten2dc98fd2011-07-08 21:11:16 +00002456 and more information, read <file:Documentation/power/apm-acpi.txt>
2457 and the Battery Powered Linux mini-HOWTO, available from
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002458 <http://www.tldp.org/docs.html#howto>.
2459
2460 This driver does not spin down disk drives (see the hdparm(8)
2461 manpage ("man 8 hdparm") for that), and it doesn't turn off
2462 VESA-compliant "green" monitors.
2463
2464 This driver does not support the TI 4000M TravelMate and the ACER
2465 486/DX4/75 because they don't have compliant BIOSes. Many "green"
2466 desktop machines also don't have compliant BIOSes, and this driver
2467 may cause those machines to panic during the boot phase.
2468
2469 Generally, if you don't have a battery in your machine, there isn't
2470 much point in using this driver and you should say N. If you get
2471 random kernel OOPSes or reboots that don't seem to be related to
2472 anything, try disabling/enabling this option (or disabling/enabling
2473 APM in your BIOS).
2474
2475 Some other things you should try when experiencing seemingly random,
2476 "weird" problems:
2477
2478 1) make sure that you have enough swap space and that it is
2479 enabled.
2480 2) pass the "no-hlt" option to the kernel
2481 3) switch on floating point emulation in the kernel and pass
2482 the "no387" option to the kernel
2483 4) pass the "floppy=nodma" option to the kernel
2484 5) pass the "mem=4M" option to the kernel (thereby disabling
2485 all but the first 4 MB of RAM)
2486 6) make sure that the CPU is not over clocked.
2487 7) read the sig11 FAQ at <http://www.bitwizard.nl/sig11/>
2488 8) disable the cache from your BIOS settings
2489 9) install a fan for the video card or exchange video RAM
2490 10) install a better fan for the CPU
2491 11) exchange RAM chips
2492 12) exchange the motherboard.
2493
2494 To compile this driver as a module, choose M here: the
2495 module will be called apm.
2496
2497if APM
2498
2499config APM_IGNORE_USER_SUSPEND
2500 bool "Ignore USER SUSPEND"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002501 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002502 This option will ignore USER SUSPEND requests. On machines with a
2503 compliant APM BIOS, you want to say N. However, on the NEC Versa M
2504 series notebooks, it is necessary to say Y because of a BIOS bug.
2505
2506config APM_DO_ENABLE
2507 bool "Enable PM at boot time"
2508 ---help---
2509 Enable APM features at boot time. From page 36 of the APM BIOS
2510 specification: "When disabled, the APM BIOS does not automatically
2511 power manage devices, enter the Standby State, enter the Suspend
2512 State, or take power saving steps in response to CPU Idle calls."
2513 This driver will make CPU Idle calls when Linux is idle (unless this
2514 feature is turned off -- see "Do CPU IDLE calls", below). This
2515 should always save battery power, but more complicated APM features
2516 will be dependent on your BIOS implementation. You may need to turn
2517 this option off if your computer hangs at boot time when using APM
2518 support, or if it beeps continuously instead of suspending. Turn
2519 this off if you have a NEC UltraLite Versa 33/C or a Toshiba
2520 T400CDT. This is off by default since most machines do fine without
2521 this feature.
2522
2523config APM_CPU_IDLE
Len Browndd8af072013-02-09 21:10:04 -05002524 depends on CPU_IDLE
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002525 bool "Make CPU Idle calls when idle"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002526 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002527 Enable calls to APM CPU Idle/CPU Busy inside the kernel's idle loop.
2528 On some machines, this can activate improved power savings, such as
2529 a slowed CPU clock rate, when the machine is idle. These idle calls
2530 are made after the idle loop has run for some length of time (e.g.,
2531 333 mS). On some machines, this will cause a hang at boot time or
2532 whenever the CPU becomes idle. (On machines with more than one CPU,
2533 this option does nothing.)
2534
2535config APM_DISPLAY_BLANK
2536 bool "Enable console blanking using APM"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002537 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002538 Enable console blanking using the APM. Some laptops can use this to
2539 turn off the LCD backlight when the screen blanker of the Linux
2540 virtual console blanks the screen. Note that this is only used by
2541 the virtual console screen blanker, and won't turn off the backlight
2542 when using the X Window system. This also doesn't have anything to
2543 do with your VESA-compliant power-saving monitor. Further, this
2544 option doesn't work for all laptops -- it might not turn off your
2545 backlight at all, or it might print a lot of errors to the console,
2546 especially if you are using gpm.
2547
2548config APM_ALLOW_INTS
2549 bool "Allow interrupts during APM BIOS calls"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002550 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002551 Normally we disable external interrupts while we are making calls to
2552 the APM BIOS as a measure to lessen the effects of a badly behaving
2553 BIOS implementation. The BIOS should reenable interrupts if it
2554 needs to. Unfortunately, some BIOSes do not -- especially those in
2555 many of the newer IBM Thinkpads. If you experience hangs when you
2556 suspend, try setting this to Y. Otherwise, say N.
2557
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002558endif # APM
2559
Dave Jonesbb0a56e2011-05-19 18:51:07 -04002560source "drivers/cpufreq/Kconfig"
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002561
2562source "drivers/cpuidle/Kconfig"
2563
Andy Henroid27471fd2008-10-09 11:45:22 -07002564source "drivers/idle/Kconfig"
2565
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002566endmenu
2567
2568
2569menu "Bus options (PCI etc.)"
2570
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002571choice
2572 prompt "PCI access mode"
Ingo Molnarefefa6f2008-07-10 16:09:50 +02002573 depends on X86_32 && PCI
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002574 default PCI_GOANY
2575 ---help---
2576 On PCI systems, the BIOS can be used to detect the PCI devices and
2577 determine their configuration. However, some old PCI motherboards
2578 have BIOS bugs and may crash if this is done. Also, some embedded
2579 PCI-based systems don't have any BIOS at all. Linux can also try to
2580 detect the PCI hardware directly without using the BIOS.
2581
2582 With this option, you can specify how Linux should detect the
2583 PCI devices. If you choose "BIOS", the BIOS will be used,
2584 if you choose "Direct", the BIOS won't be used, and if you
2585 choose "MMConfig", then PCI Express MMCONFIG will be used.
2586 If you choose "Any", the kernel will try MMCONFIG, then the
2587 direct access method and falls back to the BIOS if that doesn't
2588 work. If unsure, go with the default, which is "Any".
2589
2590config PCI_GOBIOS
2591 bool "BIOS"
2592
2593config PCI_GOMMCONFIG
2594 bool "MMConfig"
2595
2596config PCI_GODIRECT
2597 bool "Direct"
2598
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07002599config PCI_GOOLPC
Daniel Drake76fb6572010-09-23 17:28:04 +01002600 bool "OLPC XO-1"
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07002601 depends on OLPC
2602
Andres Salomon2bdd1b02008-06-05 14:14:41 -07002603config PCI_GOANY
2604 bool "Any"
2605
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002606endchoice
2607
2608config PCI_BIOS
Harvey Harrison3c2362e2008-01-30 13:31:03 +01002609 def_bool y
Ingo Molnarefefa6f2008-07-10 16:09:50 +02002610 depends on X86_32 && PCI && (PCI_GOBIOS || PCI_GOANY)
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002611
2612# x86-64 doesn't support PCI BIOS access from long mode so always go direct.
2613config PCI_DIRECT
Harvey Harrison3c2362e2008-01-30 13:31:03 +01002614 def_bool y
Shaohua Li0aba4962011-05-27 14:59:39 +08002615 depends on PCI && (X86_64 || (PCI_GODIRECT || PCI_GOANY || PCI_GOOLPC || PCI_GOMMCONFIG))
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002616
2617config PCI_MMCONFIG
Jan Kiszkab45c9f32018-03-07 08:39:16 +01002618 bool "Support mmconfig PCI config space access" if X86_64
2619 default y
Jan Kiszka8364e1f2018-03-07 08:39:17 +01002620 depends on PCI && (ACPI || SFI || JAILHOUSE_GUEST)
Jan Kiszkab45c9f32018-03-07 08:39:16 +01002621 depends on X86_64 || (PCI_GOANY || PCI_GOMMCONFIG)
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002622
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07002623config PCI_OLPC
Andres Salomon2bdd1b02008-06-05 14:14:41 -07002624 def_bool y
2625 depends on PCI && OLPC && (PCI_GOOLPC || PCI_GOANY)
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07002626
Alex Nixonb5401a92010-03-18 16:31:34 -04002627config PCI_XEN
2628 def_bool y
2629 depends on PCI && XEN
2630 select SWIOTLB_XEN
2631
Jan Kiszka8364e1f2018-03-07 08:39:17 +01002632config MMCONF_FAM10H
2633 def_bool y
2634 depends on X86_64 && PCI_MMCONFIG && ACPI
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002635
Ira W. Snyder3f6ea842010-04-01 11:43:30 -07002636config PCI_CNB20LE_QUIRK
David Rientjes6a108a12011-01-20 14:44:16 -08002637 bool "Read CNB20LE Host Bridge Windows" if EXPERT
Kees Cook6ea30382012-10-02 11:16:47 -07002638 depends on PCI
Ira W. Snyder3f6ea842010-04-01 11:43:30 -07002639 help
2640 Read the PCI windows out of the CNB20LE host bridge. This allows
2641 PCI hotplug to work on systems with the CNB20LE chipset which do
2642 not have ACPI.
2643
Bjorn Helgaas64a5fed2011-01-06 10:12:30 -07002644 There's no public spec for this chipset, and this functionality
2645 is known to be incomplete.
2646
2647 You should say N unless you know you need this.
2648
William Breathitt Gray3a495512016-05-27 18:08:27 -04002649config ISA_BUS
William Breathitt Gray17a2a122017-12-29 15:14:46 -05002650 bool "ISA bus support on modern systems" if EXPERT
William Breathitt Gray3a495512016-05-27 18:08:27 -04002651 help
William Breathitt Gray17a2a122017-12-29 15:14:46 -05002652 Expose ISA bus device drivers and options available for selection and
2653 configuration. Enable this option if your target machine has an ISA
2654 bus. ISA is an older system, displaced by PCI and newer bus
2655 architectures -- if your target machine is modern, it probably does
2656 not have an ISA bus.
William Breathitt Gray3a495512016-05-27 18:08:27 -04002657
2658 If unsure, say N.
2659
David Rientjes1c00f012011-03-22 16:34:59 -07002660# x86_64 have no ISA slots, but can have ISA-style DMA.
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002661config ISA_DMA_API
David Rientjes1c00f012011-03-22 16:34:59 -07002662 bool "ISA-style DMA support" if (X86_64 && EXPERT)
2663 default y
2664 help
2665 Enables ISA-style DMA support for devices requiring such controllers.
2666 If unsure, say Y.
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002667
Linus Torvalds51e68d02016-05-21 10:25:19 -07002668if X86_32
2669
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002670config ISA
2671 bool "ISA support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002672 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002673 Find out whether you have ISA slots on your motherboard. ISA is the
2674 name of a bus system, i.e. the way the CPU talks to the other stuff
2675 inside your box. Other bus systems are PCI, EISA, MicroChannel
2676 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
2677 newer boards don't support it. If you have ISA, say Y, otherwise N.
2678
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002679config SCx200
2680 tristate "NatSemi SCx200 support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002681 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002682 This provides basic support for National Semiconductor's
2683 (now AMD's) Geode processors. The driver probes for the
2684 PCI-IDs of several on-chip devices, so its a good dependency
2685 for other scx200_* drivers.
2686
2687 If compiled as a module, the driver is named scx200.
2688
2689config SCx200HR_TIMER
2690 tristate "NatSemi SCx200 27MHz High-Resolution Timer Support"
John Stultz592913e2010-07-13 17:56:20 -07002691 depends on SCx200
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002692 default y
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002693 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002694 This driver provides a clocksource built upon the on-chip
2695 27MHz high-resolution timer. Its also a workaround for
2696 NSC Geode SC-1100's buggy TSC, which loses time when the
2697 processor goes idle (as is done by the scheduler). The
2698 other workaround is idle=poll boot option.
2699
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07002700config OLPC
2701 bool "One Laptop Per Child support"
Thomas Gleixner54008972011-02-23 09:50:15 +01002702 depends on !X86_PAE
Andres Salomon3c554942009-12-14 18:00:36 -08002703 select GPIOLIB
Thomas Gleixnerdc3119e702011-02-23 10:08:31 +01002704 select OF
Daniel Drake45bb1672011-03-13 15:10:17 +00002705 select OF_PROMTREE
Grant Likelyb4e51852011-12-16 15:50:17 -07002706 select IRQ_DOMAIN
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002707 ---help---
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07002708 Add support for detecting the unique features of the OLPC
2709 XO hardware.
2710
Daniel Drakea3128582011-06-25 17:34:10 +01002711config OLPC_XO1_PM
2712 bool "OLPC XO-1 Power Management"
Borislav Petkovfa112cf2018-10-05 15:13:07 +02002713 depends on OLPC && MFD_CS5535=y && PM_SLEEP
Daniel Drakebf1ebf02010-10-10 10:40:32 +01002714 ---help---
Daniel Drake97c4cb72011-06-25 17:34:11 +01002715 Add support for poweroff and suspend of the OLPC XO-1 laptop.
Daniel Drakebf1ebf02010-10-10 10:40:32 +01002716
Daniel Drakecfee9592011-06-25 17:34:17 +01002717config OLPC_XO1_RTC
2718 bool "OLPC XO-1 Real Time Clock"
2719 depends on OLPC_XO1_PM && RTC_DRV_CMOS
2720 ---help---
2721 Add support for the XO-1 real time clock, which can be used as a
2722 programmable wakeup source.
2723
Daniel Drake7feda8e2011-06-25 17:34:12 +01002724config OLPC_XO1_SCI
2725 bool "OLPC XO-1 SCI extras"
Arnd Bergmann92e830f2018-04-04 14:44:54 +02002726 depends on OLPC && OLPC_XO1_PM && GPIO_CS5535=y
Randy Dunlaped8e47f2012-12-18 12:22:17 -08002727 depends on INPUT=y
Daniel Draked8d01a62011-07-24 18:33:21 +01002728 select POWER_SUPPLY
Daniel Drake7feda8e2011-06-25 17:34:12 +01002729 ---help---
2730 Add support for SCI-based features of the OLPC XO-1 laptop:
Daniel Drake7bc74b32011-06-25 17:34:14 +01002731 - EC-driven system wakeups
Daniel Drake7feda8e2011-06-25 17:34:12 +01002732 - Power button
Daniel Drake7bc74b32011-06-25 17:34:14 +01002733 - Ebook switch
Daniel Drake2cf2bae2011-06-25 17:34:15 +01002734 - Lid switch
Daniel Drakee1040ac2011-06-25 17:34:16 +01002735 - AC adapter status updates
2736 - Battery status updates
Daniel Drake7feda8e2011-06-25 17:34:12 +01002737
Daniel Drakea0f30f52011-06-25 17:34:18 +01002738config OLPC_XO15_SCI
2739 bool "OLPC XO-1.5 SCI extras"
Daniel Draked8d01a62011-07-24 18:33:21 +01002740 depends on OLPC && ACPI
2741 select POWER_SUPPLY
Daniel Drakea0f30f52011-06-25 17:34:18 +01002742 ---help---
2743 Add support for SCI-based features of the OLPC XO-1.5 laptop:
2744 - EC-driven system wakeups
2745 - AC adapter status updates
2746 - Battery status updates
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002747
Ed Wildgoosed4f3e352011-09-20 14:00:12 -07002748config ALIX
2749 bool "PCEngines ALIX System Support (LED setup)"
2750 select GPIOLIB
2751 ---help---
2752 This option enables system support for the PCEngines ALIX.
2753 At present this just sets up LEDs for GPIO control on
2754 ALIX2/3/6 boards. However, other system specific setup should
2755 get added here.
2756
2757 Note: You must still enable the drivers for GPIO and LED support
2758 (GPIO_CS5535 & LEDS_GPIO) to actually use the LEDs
2759
2760 Note: You have to set alix.force=1 for boards with Award BIOS.
2761
Philip Prindevilleda4e3302012-03-05 15:05:15 -08002762config NET5501
2763 bool "Soekris Engineering net5501 System Support (LEDS, GPIO, etc)"
2764 select GPIOLIB
2765 ---help---
2766 This option enables system support for the Soekris Engineering net5501.
2767
Philip A. Prindeville31970592012-01-14 01:45:39 -07002768config GEOS
2769 bool "Traverse Technologies GEOS System Support (LEDS, GPIO, etc)"
2770 select GPIOLIB
2771 depends on DMI
2772 ---help---
2773 This option enables system support for the Traverse Technologies GEOS.
2774
Vivien Didelot7d029122013-01-04 16:18:14 -05002775config TS5500
2776 bool "Technologic Systems TS-5500 platform support"
2777 depends on MELAN
2778 select CHECK_SIGNATURE
2779 select NEW_LEDS
2780 select LEDS_CLASS
2781 ---help---
2782 This option enables system support for the Technologic Systems TS-5500.
2783
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002784endif # X86_32
2785
Andreas Herrmann23ac4ae2010-09-17 18:03:43 +02002786config AMD_NB
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002787 def_bool y
Borislav Petkov0e152cd2010-03-12 15:43:03 +01002788 depends on CPU_SUP_AMD && PCI
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002789
David Herrmanne3263ab2013-08-02 14:05:22 +02002790config X86_SYSFB
2791 bool "Mark VGA/VBE/EFI FB as generic system framebuffer"
2792 help
2793 Firmwares often provide initial graphics framebuffers so the BIOS,
2794 bootloader or kernel can show basic video-output during boot for
2795 user-guidance and debugging. Historically, x86 used the VESA BIOS
2796 Extensions and EFI-framebuffers for this, which are mostly limited
2797 to x86.
2798 This option, if enabled, marks VGA/VBE/EFI framebuffers as generic
2799 framebuffers so the new generic system-framebuffer drivers can be
2800 used on x86. If the framebuffer is not compatible with the generic
Nikolas Nybye3a5dc02018-08-25 19:10:54 -04002801 modes, it is advertised as fallback platform framebuffer so legacy
David Herrmanne3263ab2013-08-02 14:05:22 +02002802 drivers like efifb, vesafb and uvesafb can pick it up.
2803 If this option is not selected, all system framebuffers are always
2804 marked as fallback platform framebuffers as usual.
2805
2806 Note: Legacy fbdev drivers, including vesafb, efifb, uvesafb, will
2807 not be able to pick up generic system framebuffers if this option
2808 is selected. You are highly encouraged to enable simplefb as
2809 replacement if you select this option. simplefb can correctly deal
2810 with generic system framebuffers. But you should still keep vesafb
2811 and others enabled as fallback if a system framebuffer is
2812 incompatible with simplefb.
2813
2814 If unsure, say Y.
2815
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002816endmenu
2817
2818
Christoph Hellwig15724972018-07-31 13:39:30 +02002819menu "Binary Emulations"
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002820
2821config IA32_EMULATION
2822 bool "IA32 Emulation"
2823 depends on X86_64
Ingo Molnar39f88912016-11-15 10:22:52 +01002824 select ARCH_WANT_OLD_COMPAT_IPC
Randy Dunlapd1603992013-06-18 12:33:40 -07002825 select BINFMT_ELF
Roland McGratha97f52e2008-01-30 13:31:55 +01002826 select COMPAT_BINFMT_ELF
Ingo Molnar39f88912016-11-15 10:22:52 +01002827 select COMPAT_OLD_SIGACTION
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002828 ---help---
H. J. Lu5fd92e62012-02-19 10:40:03 -08002829 Include code to run legacy 32-bit programs under a
2830 64-bit kernel. You should likely turn this on, unless you're
2831 100% sure that you don't have any 32-bit programs left.
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002832
2833config IA32_AOUT
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002834 tristate "IA32 a.out support"
2835 depends on IA32_EMULATION
Borislav Petkoveac61652019-03-05 15:47:51 +01002836 depends on BROKEN
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002837 ---help---
2838 Support old a.out binaries in the 32bit emulation.
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002839
H. Peter Anvin0bf62762012-02-27 14:09:10 -08002840config X86_X32
Kees Cook6ea30382012-10-02 11:16:47 -07002841 bool "x32 ABI for 64-bit mode"
Brian Gerst9b540502015-06-22 07:55:21 -04002842 depends on X86_64
H. J. Lu5fd92e62012-02-19 10:40:03 -08002843 ---help---
2844 Include code to run binaries for the x32 native 32-bit ABI
2845 for 64-bit processors. An x32 process gets access to the
2846 full 64-bit register file and wide data path while leaving
2847 pointers at 32 bits for smaller memory footprint.
2848
2849 You will need a recent binutils (2.22 or later) with
2850 elf32_x86_64 support enabled to compile a kernel with this
2851 option set.
2852
Ingo Molnar953fee12016-11-15 10:22:52 +01002853config COMPAT_32
2854 def_bool y
2855 depends on IA32_EMULATION || X86_32
2856 select HAVE_UID16
2857 select OLD_SIGSUSPEND3
2858
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002859config COMPAT
Harvey Harrison3c2362e2008-01-30 13:31:03 +01002860 def_bool y
H. Peter Anvin0bf62762012-02-27 14:09:10 -08002861 depends on IA32_EMULATION || X86_X32
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002862
Jan Beulich3120e252012-09-10 12:41:45 +01002863if COMPAT
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002864config COMPAT_FOR_U64_ALIGNMENT
Jan Beulich3120e252012-09-10 12:41:45 +01002865 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002866
2867config SYSVIPC_COMPAT
Harvey Harrison3c2362e2008-01-30 13:31:03 +01002868 def_bool y
Jan Beulich3120e252012-09-10 12:41:45 +01002869 depends on SYSVIPC
Jan Beulich3120e252012-09-10 12:41:45 +01002870endif
David Howellsee009e4a02011-03-07 15:06:20 +00002871
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002872endmenu
2873
2874
Keith Packarde5beae12008-11-03 18:21:45 +01002875config HAVE_ATOMIC_IOMAP
2876 def_bool y
2877 depends on X86_32
2878
Alessandro Rubini4692d772012-04-04 19:39:58 +02002879config X86_DEV_DMA_OPS
2880 bool
Alessandro Rubini83125a32012-04-04 19:40:21 +02002881 depends on X86_64 || STA2X11
Alessandro Rubini4692d772012-04-04 19:39:58 +02002882
Alessandro Rubinif7219a52012-04-04 19:40:10 +02002883config X86_DMA_REMAP
2884 bool
Alessandro Rubini83125a32012-04-04 19:40:21 +02002885 depends on STA2X11
Alessandro Rubinif7219a52012-04-04 19:40:10 +02002886
Kirill A. Shutemove5855132017-06-06 14:31:20 +03002887config HAVE_GENERIC_GUP
2888 def_bool y
2889
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002890source "drivers/firmware/Kconfig"
2891
Avi Kivityedf88412007-12-16 11:02:48 +02002892source "arch/x86/kvm/Kconfig"