blob: 9ac4ac1a856b73c73012710b9c5c029da63a5824 [file] [log] [blame]
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
Sam Ravnborg68409992007-11-17 15:37:31 +01004 bool "64-bit kernel" if ARCH = "x86"
David Woodhouseffee0de2012-12-20 21:51:55 +00005 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
17 select HAVE_AOUT
18 select HAVE_GENERIC_DMA_COHERENT
19 select MODULES_USE_ELF_REL
20 select OLD_SIGACTION
Sam Ravnborgdaa93fa2007-11-12 20:54:30 +010021
22config X86_64
Jan Beulich3120e252012-09-10 12:41:45 +010023 def_bool y
24 depends on 64BIT
Ingo Molnard94e0682016-11-15 10:11:57 +010025 # Options that are inherently 64-bit kernel only:
Aneesh Kumar K.Ve1073d12017-07-06 15:39:17 -070026 select ARCH_HAS_GIGANTIC_PAGE if (MEMORY_ISOLATION && COMPACTION) || CMA
Ingo Molnard94e0682016-11-15 10:11:57 +010027 select ARCH_SUPPORTS_INT128
28 select ARCH_USE_CMPXCHG_LOCKREF
29 select HAVE_ARCH_SOFT_DIRTY
30 select MODULES_USE_ELF_RELA
31 select X86_DEV_DMA_OPS
Sam Ravnborg1032c0b2007-11-06 21:35:08 +010032
Ingo Molnard94e0682016-11-15 10:11:57 +010033#
34# Arch settings
35#
36# ( Note that options that are marked 'if X86_64' could in principle be
37# ported to 32-bit as well. )
38#
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010039config X86
Harvey Harrison3c2362e2008-01-30 13:31:03 +010040 def_bool y
Ingo Molnarc763ea22016-11-15 10:26:39 +010041 #
42 # Note: keep this list sorted alphabetically
43 #
Ingo Molnar6471b822015-06-03 10:00:13 +020044 select ACPI_LEGACY_TABLES_LOOKUP if ACPI
45 select ACPI_SYSTEM_POWER_STATES_SUPPORT if ACPI
46 select ANON_INODES
47 select ARCH_CLOCKSOURCE_DATA
48 select ARCH_DISCARD_MEMBLOCK
Ingo Molnarc763ea22016-11-15 10:26:39 +010049 select ARCH_HAS_ACPI_TABLE_UPGRADE if ACPI
Laura Abbottfa5b6ec2017-01-10 13:35:40 -080050 select ARCH_HAS_DEBUG_VIRTUAL
Dan Williams21266be2015-11-19 18:19:29 -080051 select ARCH_HAS_DEVMEM_IS_ALLOWED
Ingo Molnar6471b822015-06-03 10:00:13 +020052 select ARCH_HAS_ELF_RANDOMIZE
Linus Torvalds72d93102014-09-13 11:14:53 -070053 select ARCH_HAS_FAST_MULTIPLIER
Daniel Micay6974f0c2017-07-12 14:36:10 -070054 select ARCH_HAS_FORTIFY_SOURCE
Riku Voipio957e3fa2014-12-12 16:57:44 -080055 select ARCH_HAS_GCOV_PROFILE_ALL
Dmitry Vyukov5c9a8752016-03-22 14:27:30 -070056 select ARCH_HAS_KCOV if X86_64
Ingo Molnarc763ea22016-11-15 10:26:39 +010057 select ARCH_HAS_PMEM_API if X86_64
Ingo Molnar7b3d61c2017-08-29 13:10:35 +020058 # Causing hangs/crashes, see the commit that added this change for details.
Kees Cook39208aa2017-09-02 13:09:46 -070059 select ARCH_HAS_REFCOUNT
Dan Williams0aed55a2017-05-29 12:22:50 -070060 select ARCH_HAS_UACCESS_FLUSHCACHE if X86_64
Daniel Borkmannd2852a22017-02-21 16:09:33 +010061 select ARCH_HAS_SET_MEMORY
Ingo Molnar6471b822015-06-03 10:00:13 +020062 select ARCH_HAS_SG_CHAIN
Laura Abbottad21fc42017-02-06 16:31:57 -080063 select ARCH_HAS_STRICT_KERNEL_RWX
64 select ARCH_HAS_STRICT_MODULE_RWX
Andrey Ryabininc6d30852016-01-20 15:00:55 -080065 select ARCH_HAS_UBSAN_SANITIZE_ALL
Oliver O'Halloran65f7d042017-06-28 11:32:31 +100066 select ARCH_HAS_ZONE_DEVICE if X86_64
Ingo Molnar6471b822015-06-03 10:00:13 +020067 select ARCH_HAVE_NMI_SAFE_CMPXCHG
68 select ARCH_MIGHT_HAVE_ACPI_PDC if ACPI
Mark Salter77fbbc82013-10-07 22:18:07 -040069 select ARCH_MIGHT_HAVE_PC_PARPORT
Mark Salter5e2c18c2014-01-01 11:34:16 -080070 select ARCH_MIGHT_HAVE_PC_SERIO
Ingo Molnar6471b822015-06-03 10:00:13 +020071 select ARCH_SUPPORTS_ATOMIC_RMW
Mel Gorman3b242c62015-06-30 14:57:13 -070072 select ARCH_SUPPORTS_DEFERRED_STRUCT_PAGE_INIT
Ingo Molnar6471b822015-06-03 10:00:13 +020073 select ARCH_SUPPORTS_NUMA_BALANCING if X86_64
74 select ARCH_USE_BUILTIN_BSWAP
Ingo Molnar6471b822015-06-03 10:00:13 +020075 select ARCH_USE_QUEUED_RWLOCKS
76 select ARCH_USE_QUEUED_SPINLOCKS
Andy Lutomirskice4a4e562017-05-28 10:00:14 -070077 select ARCH_WANT_BATCHED_UNMAP_TLB_FLUSH
Ingo Molnarc763ea22016-11-15 10:26:39 +010078 select ARCH_WANTS_DYNAMIC_TASK_STRUCT
Huang Ying38d8b4e2017-07-06 15:37:18 -070079 select ARCH_WANTS_THP_SWAP if X86_64
Ingo Molnar6471b822015-06-03 10:00:13 +020080 select BUILDTIME_EXTABLE_SORT
81 select CLKEVT_I8253
Ingo Molnar6471b822015-06-03 10:00:13 +020082 select CLOCKSOURCE_VALIDATE_LAST_CYCLE
83 select CLOCKSOURCE_WATCHDOG
Ingo Molnar6471b822015-06-03 10:00:13 +020084 select DCACHE_WORD_ACCESS
Linus Torvalds45471cd2015-06-24 19:52:06 -070085 select EDAC_ATOMIC_SCRUB
86 select EDAC_SUPPORT
Ingo Molnar6471b822015-06-03 10:00:13 +020087 select GENERIC_CLOCKEVENTS
88 select GENERIC_CLOCKEVENTS_BROADCAST if X86_64 || (X86_32 && X86_LOCAL_APIC)
89 select GENERIC_CLOCKEVENTS_MIN_ADJUST
90 select GENERIC_CMOS_UPDATE
91 select GENERIC_CPU_AUTOPROBE
92 select GENERIC_EARLY_IOREMAP
93 select GENERIC_FIND_FIRST_BIT
94 select GENERIC_IOMAP
Thomas Gleixnerc7d6c9d2017-06-20 01:37:46 +020095 select GENERIC_IRQ_EFFECTIVE_AFF_MASK if SMP
Thomas Gleixner0fa115d2017-09-13 23:29:38 +020096 select GENERIC_IRQ_MATRIX_ALLOCATOR if X86_LOCAL_APIC
Thomas Gleixnerad7a9292017-06-20 01:37:33 +020097 select GENERIC_IRQ_MIGRATION if SMP
Ingo Molnar6471b822015-06-03 10:00:13 +020098 select GENERIC_IRQ_PROBE
Thomas Gleixnerc201c912017-10-17 09:54:59 +020099 select GENERIC_IRQ_RESERVATION_MODE
Ingo Molnar6471b822015-06-03 10:00:13 +0200100 select GENERIC_IRQ_SHOW
101 select GENERIC_PENDING_IRQ if SMP
102 select GENERIC_SMP_IDLE_THREAD
103 select GENERIC_STRNCPY_FROM_USER
104 select GENERIC_STRNLEN_USER
105 select GENERIC_TIME_VSYSCALL
Thomas Gleixner7edaeb62017-08-15 09:50:13 +0200106 select HARDLOCKUP_CHECK_TIMESTAMP if X86_64
Ingo Molnar6471b822015-06-03 10:00:13 +0200107 select HAVE_ACPI_APEI if ACPI
108 select HAVE_ACPI_APEI_NMI if ACPI
109 select HAVE_ALIGNED_STRUCT_PAGE if SLUB
Ingo Molnar6471b822015-06-03 10:00:13 +0200110 select HAVE_ARCH_AUDITSYSCALL
111 select HAVE_ARCH_HUGE_VMAP if X86_64 || X86_PAE
112 select HAVE_ARCH_JUMP_LABEL
Andrey Ryabinind17a1d92017-11-15 17:36:35 -0800113 select HAVE_ARCH_KASAN if X86_64
Ingo Molnar6471b822015-06-03 10:00:13 +0200114 select HAVE_ARCH_KGDB
Daniel Cashman9e08f572016-01-14 15:20:06 -0800115 select HAVE_ARCH_MMAP_RND_BITS if MMU
116 select HAVE_ARCH_MMAP_RND_COMPAT_BITS if MMU && COMPAT
Dmitry Safonov1b028f72017-03-06 17:17:19 +0300117 select HAVE_ARCH_COMPAT_MMAP_BASES if MMU && COMPAT
Ingo Molnar6471b822015-06-03 10:00:13 +0200118 select HAVE_ARCH_SECCOMP_FILTER
Kees Cookf7d83c12017-08-16 13:26:03 -0700119 select HAVE_ARCH_THREAD_STRUCT_WHITELIST
Ingo Molnar6471b822015-06-03 10:00:13 +0200120 select HAVE_ARCH_TRACEHOOK
121 select HAVE_ARCH_TRANSPARENT_HUGEPAGE
Matthew Wilcoxa00cc7d2017-02-24 14:57:02 -0800122 select HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD if X86_64
Andy Lutomirskie37e43a2016-08-11 02:35:23 -0700123 select HAVE_ARCH_VMAP_STACK if X86_64
Ingo Molnarc763ea22016-11-15 10:26:39 +0100124 select HAVE_ARCH_WITHIN_STACK_FRAMES
Ingo Molnar6471b822015-06-03 10:00:13 +0200125 select HAVE_CC_STACKPROTECTOR
126 select HAVE_CMPXCHG_DOUBLE
127 select HAVE_CMPXCHG_LOCAL
128 select HAVE_CONTEXT_TRACKING if X86_64
Josh Triplettc1bd55f2015-06-30 15:00:00 -0700129 select HAVE_COPY_THREAD_TLS
Ingo Molnar6471b822015-06-03 10:00:13 +0200130 select HAVE_C_RECORDMCOUNT
131 select HAVE_DEBUG_KMEMLEAK
132 select HAVE_DEBUG_STACKOVERFLOW
133 select HAVE_DMA_API_DEBUG
Akinobu Mita9c5a3622014-06-04 16:06:50 -0700134 select HAVE_DMA_CONTIGUOUS
Steven Rostedt677aa9f2008-05-17 00:01:36 -0400135 select HAVE_DYNAMIC_FTRACE
Masami Hiramatsu06aeaae2012-09-28 17:15:17 +0900136 select HAVE_DYNAMIC_FTRACE_WITH_REGS
Ingo Molnarc763ea22016-11-15 10:26:39 +0100137 select HAVE_EBPF_JIT if X86_64
Johannes Berg58340a02008-07-25 01:45:33 -0700138 select HAVE_EFFICIENT_UNALIGNED_ACCESS
Jiri Slaby5f56a5d2016-05-20 17:00:16 -0700139 select HAVE_EXIT_THREAD
Steven Rostedt (VMware)644e0e82017-03-23 10:33:52 -0400140 select HAVE_FENTRY if X86_64 || DYNAMIC_FTRACE
Ingo Molnar6471b822015-06-03 10:00:13 +0200141 select HAVE_FTRACE_MCOUNT_RECORD
Ingo Molnar6471b822015-06-03 10:00:13 +0200142 select HAVE_FUNCTION_GRAPH_TRACER
143 select HAVE_FUNCTION_TRACER
Emese Revfy6b90bd42016-05-24 00:09:38 +0200144 select HAVE_GCC_PLUGINS
K.Prasad0067f122009-06-01 23:43:57 +0530145 select HAVE_HW_BREAKPOINT
Ingo Molnar6471b822015-06-03 10:00:13 +0200146 select HAVE_IDE
147 select HAVE_IOREMAP_PROT
148 select HAVE_IRQ_EXIT_ON_IRQ_STACK if X86_64
149 select HAVE_IRQ_TIME_ACCOUNTING
150 select HAVE_KERNEL_BZIP2
151 select HAVE_KERNEL_GZIP
152 select HAVE_KERNEL_LZ4
153 select HAVE_KERNEL_LZMA
154 select HAVE_KERNEL_LZO
155 select HAVE_KERNEL_XZ
156 select HAVE_KPROBES
157 select HAVE_KPROBES_ON_FTRACE
158 select HAVE_KRETPROBES
159 select HAVE_KVM
160 select HAVE_LIVEPATCH if X86_64
161 select HAVE_MEMBLOCK
162 select HAVE_MEMBLOCK_NODE_MAP
Frederic Weisbecker01027522010-04-11 18:55:56 +0200163 select HAVE_MIXED_BREAKPOINTS_REGS
Josh Poimboeufee9f8fc2017-07-24 18:36:57 -0500164 select HAVE_MOD_ARCH_SPECIFIC
Petr Mladek42a0bb32016-05-20 17:00:33 -0700165 select HAVE_NMI
Ingo Molnar6471b822015-06-03 10:00:13 +0200166 select HAVE_OPROFILE
167 select HAVE_OPTPROBES
168 select HAVE_PCSPKR_PLATFORM
169 select HAVE_PERF_EVENTS
Frederic Weisbeckerc01d4322010-05-15 22:57:48 +0200170 select HAVE_PERF_EVENTS_NMI
Nicholas Piggin92e5aae2017-08-18 15:15:51 -0700171 select HAVE_HARDLOCKUP_DETECTOR_PERF if PERF_EVENTS && HAVE_PERF_EVENTS_NMI
Jiri Olsac5e63192012-08-07 15:20:36 +0200172 select HAVE_PERF_REGS
Jiri Olsac5ebced2012-08-07 15:20:40 +0200173 select HAVE_PERF_USER_STACK_DUMP
Vitaly Kuznetsov9e52fc22017-08-28 10:22:51 +0200174 select HAVE_RCU_TABLE_FREE
Ingo Molnar6471b822015-06-03 10:00:13 +0200175 select HAVE_REGS_AND_STACK_ACCESS_API
Josh Poimboeuf11af8472017-10-13 15:02:00 -0500176 select HAVE_RELIABLE_STACKTRACE if X86_64 && UNWINDER_FRAME_POINTER && STACK_VALIDATION
Ingo Molnarc763ea22016-11-15 10:26:39 +0100177 select HAVE_STACK_VALIDATION if X86_64
Ingo Molnar6471b822015-06-03 10:00:13 +0200178 select HAVE_SYSCALL_TRACEPOINTS
Ingo Molnar6471b822015-06-03 10:00:13 +0200179 select HAVE_UNSTABLE_SCHED_CLOCK
Avi Kivity7c68af62009-09-19 09:40:22 +0300180 select HAVE_USER_RETURN_NOTIFIER
Thomas Gleixnerc01858082011-02-07 02:24:08 +0100181 select IRQ_FORCED_THREADING
Thomas Gleixnerdf65c1b2017-03-16 22:50:07 +0100182 select PCI_LOCKLESS_CONFIG
Ingo Molnar6471b822015-06-03 10:00:13 +0200183 select PERF_EVENTS
Prarit Bhargava3195ef52013-02-14 12:02:54 -0500184 select RTC_LIB
Arnd Bergmannd6faca42016-06-01 16:46:23 +0200185 select RTC_MC146818_LIB
Ingo Molnar6471b822015-06-03 10:00:13 +0200186 select SPARSE_IRQ
Pranith Kumar83fe27e2014-12-05 11:24:45 -0500187 select SRCU
Ingo Molnar6471b822015-06-03 10:00:13 +0200188 select SYSCTL_EXCEPTION_TRACE
Andy Lutomirski15f4eae2016-09-13 14:29:25 -0700189 select THREAD_INFO_IN_TASK
Ingo Molnar6471b822015-06-03 10:00:13 +0200190 select USER_STACKTRACE_SUPPORT
191 select VIRT_TO_BUS
Ingo Molnar6471b822015-06-03 10:00:13 +0200192 select X86_FEATURE_NAMES if PROC_FS
Balbir Singh7d8330a2008-02-10 12:46:28 +0530193
Ingo Molnarba7e4d12009-06-06 13:58:12 +0200194config INSTRUCTION_DECODER
Jan Beulich3120e252012-09-10 12:41:45 +0100195 def_bool y
196 depends on KPROBES || PERF_EVENTS || UPROBES
Ingo Molnarba7e4d12009-06-06 13:58:12 +0200197
Linus Torvalds51b26ad2009-04-26 10:12:47 -0700198config OUTPUT_FORMAT
199 string
200 default "elf32-i386" if X86_32
201 default "elf64-x86-64" if X86_64
202
Sam Ravnborg73531902008-05-25 23:03:18 +0200203config ARCH_DEFCONFIG
Sam Ravnborgb9b39bfb2008-04-29 12:48:15 +0200204 string
Sam Ravnborg73531902008-05-25 23:03:18 +0200205 default "arch/x86/configs/i386_defconfig" if X86_32
206 default "arch/x86/configs/x86_64_defconfig" if X86_64
Sam Ravnborgb9b39bfb2008-04-29 12:48:15 +0200207
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100208config LOCKDEP_SUPPORT
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100209 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100210
211config STACKTRACE_SUPPORT
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100212 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100213
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100214config MMU
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100215 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100216
Daniel Cashman9e08f572016-01-14 15:20:06 -0800217config ARCH_MMAP_RND_BITS_MIN
218 default 28 if 64BIT
219 default 8
220
221config ARCH_MMAP_RND_BITS_MAX
222 default 32 if 64BIT
223 default 16
224
225config ARCH_MMAP_RND_COMPAT_BITS_MIN
226 default 8
227
228config ARCH_MMAP_RND_COMPAT_BITS_MAX
229 default 16
230
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100231config SBUS
232 bool
233
FUJITA Tomonori3bc4e452010-03-10 15:23:22 -0800234config NEED_DMA_MAP_STATE
Jan Beulich3120e252012-09-10 12:41:45 +0100235 def_bool y
Konrad Rzeszutek Wilka6dfa122015-04-17 15:04:48 -0400236 depends on X86_64 || INTEL_IOMMU || DMA_API_DEBUG || SWIOTLB
FUJITA Tomonori3bc4e452010-03-10 15:23:22 -0800237
FUJITA Tomonori18e98302010-05-26 14:44:32 -0700238config NEED_SG_DMA_LENGTH
Andrew Morton4a14d842010-05-26 14:44:33 -0700239 def_bool y
FUJITA Tomonori18e98302010-05-26 14:44:32 -0700240
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100241config GENERIC_ISA_DMA
Jan Beulich3120e252012-09-10 12:41:45 +0100242 def_bool y
243 depends on ISA_DMA_API
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100244
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100245config GENERIC_BUG
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100246 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100247 depends on BUG
Jan Beulichb93a5312008-12-16 11:40:27 +0000248 select GENERIC_BUG_RELATIVE_POINTERS if X86_64
249
250config GENERIC_BUG_RELATIVE_POINTERS
251 bool
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100252
253config GENERIC_HWEIGHT
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100254 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100255
256config ARCH_MAY_HAVE_PC_FDC
Jan Beulich3120e252012-09-10 12:41:45 +0100257 def_bool y
258 depends on ISA_DMA_API
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100259
Sam Ravnborg1032c0b2007-11-06 21:35:08 +0100260config RWSEM_XCHGADD_ALGORITHM
Jan Beulich3120e252012-09-10 12:41:45 +0100261 def_bool y
Sam Ravnborg1032c0b2007-11-06 21:35:08 +0100262
Sam Ravnborg1032c0b2007-11-06 21:35:08 +0100263config GENERIC_CALIBRATE_DELAY
264 def_bool y
265
venkatesh.pallipadi@intel.com9a0b8412008-01-31 17:35:06 -0800266config ARCH_HAS_CPU_RELAX
267 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100268
Pekka Enberg1b27d052008-04-28 02:12:22 -0700269config ARCH_HAS_CACHE_LINE_SIZE
270 def_bool y
271
Mike Travisdd5af902008-01-30 13:33:32 +0100272config HAVE_SETUP_PER_CPU_AREA
Brian Gerst89c9c4c2009-01-27 12:56:48 +0900273 def_bool y
travis@sgi.comb32ef632008-01-30 13:32:51 +0100274
Tejun Heo08fc4582009-08-14 15:00:49 +0900275config NEED_PER_CPU_EMBED_FIRST_CHUNK
276 def_bool y
277
278config NEED_PER_CPU_PAGE_FIRST_CHUNK
Tejun Heo11124412009-02-20 16:29:09 +0900279 def_bool y
280
Johannes Berg801e4062007-12-08 02:12:39 +0100281config ARCH_HIBERNATION_POSSIBLE
282 def_bool y
Johannes Berg801e4062007-12-08 02:12:39 +0100283
Johannes Bergf4cb5702007-12-08 02:14:00 +0100284config ARCH_SUSPEND_POSSIBLE
285 def_bool y
Johannes Bergf4cb5702007-12-08 02:14:00 +0100286
Steve Cappercfe28c52013-04-29 14:29:48 +0100287config ARCH_WANT_HUGE_PMD_SHARE
288 def_bool y
289
Steve Capper53313b22013-04-30 08:03:42 +0100290config ARCH_WANT_GENERAL_HUGETLB
291 def_bool y
292
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100293config ZONE_DMA32
Jan Beuliche0fd24a2015-02-05 15:39:34 +0000294 def_bool y if X86_64
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100295
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100296config AUDIT_ARCH
Jan Beuliche0fd24a2015-02-05 15:39:34 +0000297 def_bool y if X86_64
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100298
Ingo Molnar765c68b2008-04-09 11:03:37 +0200299config ARCH_SUPPORTS_OPTIMIZED_INLINING
300 def_bool y
301
Akinobu Mita6a11f752009-03-31 15:23:17 -0700302config ARCH_SUPPORTS_DEBUG_PAGEALLOC
303 def_bool y
304
Andrey Ryabinind6f2d752015-07-02 12:09:38 +0300305config KASAN_SHADOW_OFFSET
306 hex
307 depends on KASAN
308 default 0xdffffc0000000000
309
Shane Wang69575d32009-09-01 18:25:07 -0700310config HAVE_INTEL_TXT
311 def_bool y
Kees Cook6ea30382012-10-02 11:16:47 -0700312 depends on INTEL_IOMMU && ACPI
Shane Wang69575d32009-09-01 18:25:07 -0700313
Sam Ravnborg6b0c3d42008-01-30 13:32:27 +0100314config X86_32_SMP
315 def_bool y
316 depends on X86_32 && SMP
317
318config X86_64_SMP
319 def_bool y
320 depends on X86_64 && SMP
321
Tejun Heoccbeed32009-02-09 22:17:40 +0900322config X86_32_LAZY_GS
323 def_bool y
Tejun Heo60a53172009-02-09 22:17:40 +0900324 depends on X86_32 && !CC_STACKPROTECTOR
Tejun Heoccbeed32009-02-09 22:17:40 +0900325
Srikar Dronamraju2b144492012-02-09 14:56:42 +0530326config ARCH_SUPPORTS_UPROBES
327 def_bool y
328
Rob Herringd20642f2014-04-18 17:19:54 -0500329config FIX_EARLYCON_MEM
330 def_bool y
331
Kirill A. Shutemov98233362015-04-14 15:46:14 -0700332config PGTABLE_LEVELS
333 int
Kirill A. Shutemov77ef56e2017-07-17 01:59:54 +0300334 default 5 if X86_5LEVEL
Kirill A. Shutemov98233362015-04-14 15:46:14 -0700335 default 4 if X86_64
336 default 3 if X86_PAE
337 default 2
338
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100339source "init/Kconfig"
Matt Helsleydc52ddc2008-10-18 20:27:21 -0700340source "kernel/Kconfig.freezer"
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100341
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100342menu "Processor type and features"
343
Randy Dunlap5ee71532012-01-16 11:57:18 -0800344config ZONE_DMA
345 bool "DMA memory allocation support" if EXPERT
346 default y
347 help
348 DMA memory allocation support allows devices with less than 32-bit
349 addressing to allocate within the first 16MB of address space.
350 Disable if no such devices will be used.
351
352 If unsure, say Y.
353
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100354config SMP
355 bool "Symmetric multi-processing support"
356 ---help---
357 This enables support for systems with more than one CPU. If you have
Robert Graffham4a474152014-01-23 15:55:29 -0800358 a system with only one CPU, say N. If you have a system with more
359 than one CPU, say Y.
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100360
Robert Graffham4a474152014-01-23 15:55:29 -0800361 If you say N here, the kernel will run on uni- and multiprocessor
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100362 machines, but will use only one CPU of a multiprocessor machine. If
363 you say Y here, the kernel will run on many, but not all,
Robert Graffham4a474152014-01-23 15:55:29 -0800364 uniprocessor machines. On a uniprocessor machine, the kernel
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100365 will run faster if you say N here.
366
367 Note that if you say Y here and choose architecture "586" or
368 "Pentium" under "Processor family", the kernel will not work on 486
369 architectures. Similarly, multiprocessor kernels for the "PPro"
370 architecture may not work on all Pentium based boards.
371
372 People using multiprocessor machines who say Y here should also say
373 Y to "Enhanced Real Time Clock Support", below. The "Advanced Power
374 Management" code will be disabled if you say Y here.
375
Paul Bolle395cf962011-08-15 02:02:26 +0200376 See also <file:Documentation/x86/i386/IO-APIC.txt>,
Benjamin Petersonc9525a32017-05-20 17:20:16 -0700377 <file:Documentation/lockup-watchdogs.txt> and the SMP-HOWTO available at
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100378 <http://www.tldp.org/docs.html#howto>.
379
380 If you don't know what to do here, say N.
381
Josh Triplett9def39be2013-10-30 08:09:45 -0700382config X86_FEATURE_NAMES
383 bool "Processor feature human-readable names" if EMBEDDED
384 default y
385 ---help---
386 This option compiles in a table of x86 feature bits and corresponding
387 names. This is required to support /proc/cpuinfo and a few kernel
388 messages. You can disable this to save space, at the expense of
389 making those few kernel messages show numeric feature bits instead.
390
391 If in doubt, say Y.
392
Borislav Petkov6e1315f2015-12-07 10:39:42 +0100393config X86_FAST_FEATURE_TESTS
394 bool "Fast CPU feature tests" if EMBEDDED
395 default y
396 ---help---
397 Some fast-paths in the kernel depend on the capabilities of the CPU.
398 Say Y here for the kernel to patch in the appropriate code at runtime
399 based on the capabilities of the CPU. The infrastructure for patching
400 code at runtime takes up some additional space; space-constrained
401 embedded systems may wish to say N here to produce smaller, slightly
402 slower code.
403
Yinghai Lu06cd9a72009-02-16 17:29:58 -0800404config X86_X2APIC
405 bool "Support x2apic"
Jan Kiszka19e3d602015-05-04 17:58:01 +0200406 depends on X86_LOCAL_APIC && X86_64 && (IRQ_REMAP || HYPERVISOR_GUEST)
Yinghai Lu06cd9a72009-02-16 17:29:58 -0800407 ---help---
408 This enables x2apic support on CPUs that have this feature.
409
410 This allows 32-bit apic IDs (so it can support very large systems),
411 and accesses the local apic via MSRs not via mmio.
412
Yinghai Lu06cd9a72009-02-16 17:29:58 -0800413 If you don't know what to do here, say N.
414
Yinghai Lu6695c852008-06-19 12:13:09 -0700415config X86_MPPARSE
Bin Gao6e87f9b72012-10-25 09:35:44 -0700416 bool "Enable MPS table" if ACPI || SFI
Jan Beulich7a527682008-10-30 10:38:24 +0000417 default y
Ingo Molnar5ab74722008-07-10 14:42:03 +0200418 depends on X86_LOCAL_APIC
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100419 ---help---
Yinghai Lu6695c852008-06-19 12:13:09 -0700420 For old smp systems that do not have proper acpi support. Newer systems
421 (esp with 64bit cpus) with acpi support, MADT and DSDT will override it
Yinghai Lu6695c852008-06-19 12:13:09 -0700422
Yinghai Lu26f7ef12009-01-29 14:19:22 -0800423config X86_BIGSMP
424 bool "Support for big SMP systems with more than 8 CPUs"
425 depends on X86_32 && SMP
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100426 ---help---
Yinghai Lu26f7ef12009-01-29 14:19:22 -0800427 This option is needed for the systems that have more than 8 CPUs
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100428
Jun Nakajimaddd70cf2013-01-21 17:23:09 +0000429config GOLDFISH
430 def_bool y
431 depends on X86_GOLDFISH
432
Vikas Shivappaf01d7d512017-07-25 14:14:22 -0700433config INTEL_RDT
434 bool "Intel Resource Director Technology support"
Fenghua Yu78e99b42016-10-22 06:19:53 -0700435 default n
436 depends on X86 && CPU_SUP_INTEL
Thomas Gleixner59fe5a72016-11-15 15:17:12 +0100437 select KERNFS
Fenghua Yu78e99b42016-10-22 06:19:53 -0700438 help
Vikas Shivappaf01d7d512017-07-25 14:14:22 -0700439 Select to enable resource allocation and monitoring which are
440 sub-features of Intel Resource Director Technology(RDT). More
441 information about RDT can be found in the Intel x86
442 Architecture Software Developer Manual.
Fenghua Yu78e99b42016-10-22 06:19:53 -0700443
444 Say N if unsure.
445
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800446if X86_32
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800447config X86_EXTENDED_PLATFORM
448 bool "Support for extended (non-PC) x86 platforms"
449 default y
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100450 ---help---
Ingo Molnar06ac8342009-01-27 18:11:43 +0100451 If you disable this option then the kernel will only support
452 standard PC platforms. (which covers the vast majority of
453 systems out there.)
454
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800455 If you enable this option then you'll be able to select support
456 for the following (non-PC) 32 bit x86 platforms:
Ben Hutchingscb7b8022013-06-24 01:05:25 +0100457 Goldfish (Android emulator)
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800458 AMD Elan
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800459 RDC R-321x SoC
460 SGI 320/540 (Visual Workstation)
Alessandro Rubini83125a32012-04-04 19:40:21 +0200461 STA2X11-based (e.g. Northville)
Thomas Gleixner3f4110a2009-08-29 14:54:20 +0200462 Moorestown MID devices
Ingo Molnar06ac8342009-01-27 18:11:43 +0100463
464 If you have one of these systems, or if you want to build a
465 generic distribution kernel, say Y here - otherwise say N.
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800466endif
Ingo Molnar06ac8342009-01-27 18:11:43 +0100467
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800468if X86_64
469config X86_EXTENDED_PLATFORM
470 bool "Support for extended (non-PC) x86 platforms"
471 default y
472 ---help---
473 If you disable this option then the kernel will only support
474 standard PC platforms. (which covers the vast majority of
475 systems out there.)
476
477 If you enable this option then you'll be able to select support
478 for the following (non-PC) 64 bit x86 platforms:
Steffen Persvold44b111b52011-12-06 00:07:26 +0800479 Numascale NumaChip
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800480 ScaleMP vSMP
481 SGI Ultraviolet
482
483 If you have one of these systems, or if you want to build a
484 generic distribution kernel, say Y here - otherwise say N.
485endif
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800486# This is an alphabetically sorted list of 64 bit extended platforms
487# Please maintain the alphabetic order if and when there are additions
Steffen Persvold44b111b52011-12-06 00:07:26 +0800488config X86_NUMACHIP
489 bool "Numascale NumaChip"
490 depends on X86_64
491 depends on X86_EXTENDED_PLATFORM
492 depends on NUMA
493 depends on SMP
494 depends on X86_X2APIC
Daniel J Bluemanf9726bf2012-12-07 14:24:32 -0700495 depends on PCI_MMCONFIG
Steffen Persvold44b111b52011-12-06 00:07:26 +0800496 ---help---
497 Adds support for Numascale NumaChip large-SMP systems. Needed to
498 enable more than ~168 cores.
499 If you don't have one of these, you should say N here.
Nick Piggin03b48632009-01-20 04:36:04 +0100500
Ingo Molnar6a485652009-01-27 18:29:13 +0100501config X86_VSMP
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800502 bool "ScaleMP vSMP"
Borislav Petkov6276a072013-03-04 21:20:21 +0100503 select HYPERVISOR_GUEST
Ingo Molnar6a485652009-01-27 18:29:13 +0100504 select PARAVIRT
505 depends on X86_64 && PCI
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800506 depends on X86_EXTENDED_PLATFORM
Shai Fultheimead91d42012-04-16 10:39:35 +0300507 depends on SMP
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100508 ---help---
Ingo Molnar6a485652009-01-27 18:29:13 +0100509 Support for ScaleMP vSMP systems. Say 'Y' here if this kernel is
510 supposed to run on these EM64T-based machines. Only choose this option
511 if you have one of these machines.
512
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800513config X86_UV
514 bool "SGI Ultraviolet"
515 depends on X86_64
516 depends on X86_EXTENDED_PLATFORM
Jack Steiner54c28d22009-04-03 15:39:42 -0500517 depends on NUMA
Andrew Morton1ecb4ae2016-02-11 16:13:20 -0800518 depends on EFI
Suresh Siddha9d6c26e2009-04-20 13:02:31 -0700519 depends on X86_X2APIC
Ingo Molnar1222e562015-05-06 06:23:59 +0200520 depends on PCI
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800521 ---help---
522 This option is needed in order to support SGI Ultraviolet systems.
523 If you don't have one of these, you should say N here.
524
525# Following is an alphabetically sorted list of 32 bit extended platforms
526# Please maintain the alphabetic order if and when there are additions
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100527
Jun Nakajimaddd70cf2013-01-21 17:23:09 +0000528config X86_GOLDFISH
529 bool "Goldfish (Virtual Platform)"
Ben Hutchingscb7b8022013-06-24 01:05:25 +0100530 depends on X86_EXTENDED_PLATFORM
Jun Nakajimaddd70cf2013-01-21 17:23:09 +0000531 ---help---
532 Enable support for the Goldfish virtual platform used primarily
533 for Android development. Unless you are building for the Android
534 Goldfish emulator say N here.
535
Thomas Gleixnerc751e172010-11-09 12:08:04 -0800536config X86_INTEL_CE
537 bool "CE4100 TV platform"
538 depends on PCI
539 depends on PCI_GODIRECT
Jiang Liu6084a6e2014-06-09 16:19:46 +0800540 depends on X86_IO_APIC
Thomas Gleixnerc751e172010-11-09 12:08:04 -0800541 depends on X86_32
542 depends on X86_EXTENDED_PLATFORM
Dirk Brandewie37bc9f52010-11-09 12:08:08 -0800543 select X86_REBOOTFIXUPS
Sebastian Andrzej Siewiorda6b7372011-02-22 21:07:37 +0100544 select OF
545 select OF_EARLY_FLATTREE
Thomas Gleixnerc751e172010-11-09 12:08:04 -0800546 ---help---
547 Select for the Intel CE media processor (CE4100) SOC.
548 This option compiles in support for the CE4100 SOC for settop
549 boxes and media devices.
550
David Cohen4cb9b002013-12-16 17:37:26 -0800551config X86_INTEL_MID
Alan Cox43605ef2011-07-12 17:49:29 +0100552 bool "Intel MID platform support"
Alan Cox43605ef2011-07-12 17:49:29 +0100553 depends on X86_EXTENDED_PLATFORM
David Cohenedc6bc72014-01-21 10:41:39 -0800554 depends on X86_PLATFORM_DEVICES
Alan Cox1ea7c672011-11-10 13:29:14 +0000555 depends on PCI
Andy Shevchenko3fda5bb2016-01-15 22:11:07 +0200556 depends on X86_64 || (PCI_GOANY && X86_32)
Alan Cox1ea7c672011-11-10 13:29:14 +0000557 depends on X86_IO_APIC
Alan Cox7c9c3a12011-12-29 14:43:16 +0000558 select SFI
David Cohen4cb9b002013-12-16 17:37:26 -0800559 select I2C
Alan Cox7c9c3a12011-12-29 14:43:16 +0000560 select DW_APB_TIMER
Alan Cox1ea7c672011-11-10 13:29:14 +0000561 select APB_TIMER
Alan Cox1ea7c672011-11-10 13:29:14 +0000562 select INTEL_SCU_IPC
Mika Westerberg15a713d2012-01-26 17:35:05 +0000563 select MFD_INTEL_MSIC
Alan Cox1ea7c672011-11-10 13:29:14 +0000564 ---help---
David Cohen4cb9b002013-12-16 17:37:26 -0800565 Select to build a kernel capable of supporting Intel MID (Mobile
566 Internet Device) platform systems which do not have the PCI legacy
567 interfaces. If you are building for a PC class system say N here.
Alan Cox1ea7c672011-11-10 13:29:14 +0000568
David Cohen4cb9b002013-12-16 17:37:26 -0800569 Intel MID platforms are based on an Intel processor and chipset which
570 consume less power than most of the x86 derivatives.
Alan Cox43605ef2011-07-12 17:49:29 +0100571
Bryan O'Donoghue8bbc2a12015-01-30 16:29:39 +0000572config X86_INTEL_QUARK
573 bool "Intel Quark platform support"
574 depends on X86_32
575 depends on X86_EXTENDED_PLATFORM
576 depends on X86_PLATFORM_DEVICES
577 depends on X86_TSC
578 depends on PCI
579 depends on PCI_GOANY
580 depends on X86_IO_APIC
581 select IOSF_MBI
582 select INTEL_IMR
Andy Shevchenko9ab6eb52015-03-05 17:24:04 +0200583 select COMMON_CLK
Bryan O'Donoghue8bbc2a12015-01-30 16:29:39 +0000584 ---help---
585 Select to include support for Quark X1000 SoC.
586 Say Y here if you have a Quark based system such as the Arduino
587 compatible Intel Galileo.
588
Mika Westerberg3d48aab2013-01-18 13:45:59 +0000589config X86_INTEL_LPSS
590 bool "Intel Low Power Subsystem Support"
Andy Shevchenkoeebb3e82015-12-12 02:45:06 +0100591 depends on X86 && ACPI
Mika Westerberg3d48aab2013-01-18 13:45:59 +0000592 select COMMON_CLK
Mathias Nyman0f531432013-09-13 17:02:29 +0300593 select PINCTRL
Andy Shevchenkoeebb3e82015-12-12 02:45:06 +0100594 select IOSF_MBI
Mika Westerberg3d48aab2013-01-18 13:45:59 +0000595 ---help---
596 Select to build support for Intel Low Power Subsystem such as
597 found on Intel Lynxpoint PCH. Selecting this option enables
Mathias Nyman0f531432013-09-13 17:02:29 +0300598 things like clock tree (common clock framework) and pincontrol
599 which are needed by the LPSS peripheral drivers.
Mika Westerberg3d48aab2013-01-18 13:45:59 +0000600
Ken Xue92082a82015-02-06 08:27:51 +0800601config X86_AMD_PLATFORM_DEVICE
602 bool "AMD ACPI2Platform devices support"
603 depends on ACPI
604 select COMMON_CLK
605 select PINCTRL
606 ---help---
607 Select to interpret AMD specific ACPI device to platform device
608 such as I2C, UART, GPIO found on AMD Carrizo and later chipsets.
609 I2C and UART depend on COMMON_CLK to set clock. GPIO driver is
610 implemented under PINCTRL subsystem.
611
David E. Boxced3ce72014-09-17 22:13:50 -0700612config IOSF_MBI
613 tristate "Intel SoC IOSF Sideband support for SoC platforms"
614 depends on PCI
615 ---help---
616 This option enables sideband register access support for Intel SoC
617 platforms. On these platforms the IOSF sideband is used in lieu of
618 MSR's for some register accesses, mostly but not limited to thermal
619 and power. Drivers may query the availability of this device to
620 determine if they need the sideband in order to work on these
621 platforms. The sideband is available on the following SoC products.
622 This list is not meant to be exclusive.
623 - BayTrail
624 - Braswell
625 - Quark
626
627 You should say Y if you are running a kernel on one of these SoC's.
628
David E. Boxed2226b2014-09-17 22:13:51 -0700629config IOSF_MBI_DEBUG
630 bool "Enable IOSF sideband access through debugfs"
631 depends on IOSF_MBI && DEBUG_FS
632 ---help---
633 Select this option to expose the IOSF sideband access registers (MCR,
634 MDR, MCRX) through debugfs to write and read register information from
635 different units on the SoC. This is most useful for obtaining device
636 state information for debug and analysis. As this is a general access
637 mechanism, users of this option would have specific knowledge of the
638 device they want to access.
639
640 If you don't require the option or are in doubt, say N.
641
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800642config X86_RDC321X
643 bool "RDC R-321x SoC"
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100644 depends on X86_32
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800645 depends on X86_EXTENDED_PLATFORM
646 select M486
647 select X86_REBOOTFIXUPS
648 ---help---
649 This option is needed for RDC R-321x system-on-chip, also known
650 as R-8610-(G).
651 If you don't have one of these chips, you should say N here.
652
Ingo Molnare0c7ae32009-01-27 18:43:09 +0100653config X86_32_NON_STANDARD
Ingo Molnar9c398012009-01-27 18:24:57 +0100654 bool "Support non-standard 32-bit SMP architectures"
655 depends on X86_32 && SMP
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800656 depends on X86_EXTENDED_PLATFORM
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100657 ---help---
H. Peter Anvinb5660ba2014-02-25 12:14:06 -0800658 This option compiles in the bigsmp and STA2X11 default
659 subarchitectures. It is intended for a generic binary
660 kernel. If you select them all, kernel will probe it one by
661 one and will fallback to default.
Yinghai Lud49c4282008-06-08 18:31:54 -0700662
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800663# Alphabetically sorted list of Non standard 32 bit platforms
Yinghai Lud49c4282008-06-08 18:31:54 -0700664
Linus Torvaldsd949f362009-09-26 09:35:07 -0700665config X86_SUPPORTS_MEMORY_FAILURE
Jan Beulich6fc108a2010-04-21 15:23:44 +0100666 def_bool y
Linus Torvaldsd949f362009-09-26 09:35:07 -0700667 # MCE code calls memory_failure():
668 depends on X86_MCE
669 # On 32-bit this adds too big of NODES_SHIFT and we run out of page flags:
Linus Torvaldsd949f362009-09-26 09:35:07 -0700670 # On 32-bit SPARSEMEM adds too big of SECTIONS_WIDTH:
671 depends on X86_64 || !SPARSEMEM
672 select ARCH_SUPPORTS_MEMORY_FAILURE
Linus Torvaldsd949f362009-09-26 09:35:07 -0700673
Alessandro Rubini83125a32012-04-04 19:40:21 +0200674config STA2X11
675 bool "STA2X11 Companion Chip Support"
676 depends on X86_32_NON_STANDARD && PCI
677 select X86_DEV_DMA_OPS
678 select X86_DMA_REMAP
679 select SWIOTLB
680 select MFD_STA2X11
Linus Walleij01450712016-06-02 14:20:18 +0200681 select GPIOLIB
Alessandro Rubini83125a32012-04-04 19:40:21 +0200682 default n
683 ---help---
684 This adds support for boards based on the STA2X11 IO-Hub,
685 a.k.a. "ConneXt". The chip is used in place of the standard
686 PC chipset, so all "standard" peripherals are missing. If this
687 option is selected the kernel will still be able to boot on
688 standard PC machines.
689
Shérab82148d12010-09-25 06:06:57 +0200690config X86_32_IRIS
691 tristate "Eurobraille/Iris poweroff module"
692 depends on X86_32
693 ---help---
694 The Iris machines from EuroBraille do not have APM or ACPI support
695 to shut themselves down properly. A special I/O sequence is
696 needed to do so, which is what this module does at
697 kernel shutdown.
698
699 This is only for Iris machines from EuroBraille.
700
701 If unused, say N.
702
Ingo Molnarae1e9132008-11-11 09:05:16 +0100703config SCHED_OMIT_FRAME_POINTER
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100704 def_bool y
705 prompt "Single-depth WCHAN output"
Ken Chena87d0912008-11-06 11:10:49 -0800706 depends on X86
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100707 ---help---
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100708 Calculate simpler /proc/<PID>/wchan values. If this option
709 is disabled then wchan values will recurse back to the
710 caller function. This provides more accurate wchan values,
711 at the expense of slightly more scheduling overhead.
712
713 If in doubt, say "Y".
714
Borislav Petkov6276a072013-03-04 21:20:21 +0100715menuconfig HYPERVISOR_GUEST
716 bool "Linux guest support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100717 ---help---
Borislav Petkov6276a072013-03-04 21:20:21 +0100718 Say Y here to enable options for running Linux under various hyper-
719 visors. This option enables basic hypervisor detection and platform
720 setup.
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100721
Borislav Petkov6276a072013-03-04 21:20:21 +0100722 If you say N, all options in this submenu will be skipped and
723 disabled, and Linux guest support won't be built in.
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100724
Borislav Petkov6276a072013-03-04 21:20:21 +0100725if HYPERVISOR_GUEST
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100726
Eduardo Pereira Habkoste61bd942008-01-30 13:33:32 +0100727config PARAVIRT
728 bool "Enable paravirtualization code"
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100729 ---help---
Eduardo Pereira Habkoste61bd942008-01-30 13:33:32 +0100730 This changes the kernel so it can modify itself when it is run
731 under a hypervisor, potentially improving performance significantly
732 over full virtualization. However, when run without a hypervisor
733 the kernel is theoretically slower and slightly larger.
734
Borislav Petkov6276a072013-03-04 21:20:21 +0100735config PARAVIRT_DEBUG
736 bool "paravirt-ops debugging"
737 depends on PARAVIRT && DEBUG_KERNEL
738 ---help---
739 Enable to debug paravirt_ops internals. Specifically, BUG if
740 a paravirt_op is missing when it is called.
741
Jeremy Fitzhardingeb4ecc122009-05-13 17:16:55 -0700742config PARAVIRT_SPINLOCKS
743 bool "Paravirtualization layer for spinlocks"
Kees Cook6ea30382012-10-02 11:16:47 -0700744 depends on PARAVIRT && SMP
Jeremy Fitzhardingeb4ecc122009-05-13 17:16:55 -0700745 ---help---
746 Paravirtualized spinlocks allow a pvops backend to replace the
747 spinlock implementation with something virtualization-friendly
748 (for example, block the virtual CPU rather than spinning).
749
Raghavendra K T4c4e4f62013-10-21 21:35:08 +0530750 It has a minimal impact on native kernels and gives a nice performance
751 benefit on paravirtualized KVM / Xen kernels.
Jeremy Fitzhardingeb4ecc122009-05-13 17:16:55 -0700752
Raghavendra K T4c4e4f62013-10-21 21:35:08 +0530753 If you are unsure how to answer this question, answer Y.
Jeremy Fitzhardingeb4ecc122009-05-13 17:16:55 -0700754
Waiman Long45e898b2015-11-09 19:09:25 -0500755config QUEUED_LOCK_STAT
756 bool "Paravirt queued spinlock statistics"
Peter Zijlstracfd89832016-05-18 20:43:02 +0200757 depends on PARAVIRT_SPINLOCKS && DEBUG_FS
Waiman Long45e898b2015-11-09 19:09:25 -0500758 ---help---
759 Enable the collection of statistical data on the slowpath
760 behavior of paravirtualized queued spinlocks and report
761 them on debugfs.
762
Borislav Petkov6276a072013-03-04 21:20:21 +0100763source "arch/x86/xen/Kconfig"
764
765config KVM_GUEST
766 bool "KVM Guest support (including kvmclock)"
767 depends on PARAVIRT
768 select PARAVIRT_CLOCK
769 default y
770 ---help---
771 This option enables various optimizations for running under the KVM
772 hypervisor. It includes a paravirtualized clock, so that instead
773 of relying on a PIT (or probably other) emulation by the
774 underlying device model, the host provides the guest with
775 timing infrastructure such as time of day, and system time
776
Srivatsa Vaddagiri1e20eb82013-08-09 19:52:01 +0530777config KVM_DEBUG_FS
778 bool "Enable debug information for KVM Guests in debugfs"
779 depends on KVM_GUEST && DEBUG_FS
780 default n
781 ---help---
782 This option enables collection of various statistics for KVM guest.
783 Statistics are displayed in debugfs filesystem. Enabling this option
784 may incur significant overhead.
785
Borislav Petkov6276a072013-03-04 21:20:21 +0100786config PARAVIRT_TIME_ACCOUNTING
787 bool "Paravirtual steal time accounting"
788 depends on PARAVIRT
789 default n
790 ---help---
791 Select this option to enable fine granularity task steal time
792 accounting. Time spent executing other tasks in parallel with
793 the current vCPU is discounted from the vCPU power. To account for
794 that, there can be a small performance impact.
795
796 If in doubt, say N here.
797
Gerd Hoffmann7af192c2008-06-03 16:17:29 +0200798config PARAVIRT_CLOCK
799 bool
Gerd Hoffmann7af192c2008-06-03 16:17:29 +0200800
Borislav Petkov6276a072013-03-04 21:20:21 +0100801endif #HYPERVISOR_GUEST
Jeremy Fitzhardinge97349132008-06-25 00:19:14 -0400802
Yinghai Lu08677212010-02-10 01:20:20 -0800803config NO_BOOTMEM
Yinghai Lu774ea0b2010-08-25 13:39:18 -0700804 def_bool y
Yinghai Lu08677212010-02-10 01:20:20 -0800805
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100806source "arch/x86/Kconfig.cpu"
807
808config HPET_TIMER
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100809 def_bool X86_64
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100810 prompt "HPET Timer Support" if X86_32
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100811 ---help---
812 Use the IA-PC HPET (High Precision Event Timer) to manage
813 time in preference to the PIT and RTC, if a HPET is
814 present.
815 HPET is the next generation timer replacing legacy 8254s.
816 The HPET provides a stable time base on SMP
817 systems, unlike the TSC, but it is more expensive to access,
Michael S. Tsirkin4e7f9df2016-02-11 01:05:01 +0200818 as it is off-chip. The interface used is documented
819 in the HPET spec, revision 1.
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100820
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100821 You can safely choose Y here. However, HPET will only be
822 activated if the platform and the BIOS support this feature.
823 Otherwise the 8254 will be used for timing services.
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100824
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100825 Choose N to continue using the legacy 8254 timer.
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100826
827config HPET_EMULATE_RTC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100828 def_bool y
Bernhard Walle9d8af782008-02-06 01:38:52 -0800829 depends on HPET_TIMER && (RTC=y || RTC=m || RTC_DRV_CMOS=m || RTC_DRV_CMOS=y)
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100830
Jacob Panbb24c472009-09-02 07:37:17 -0700831config APB_TIMER
Alan Cox933b9462011-12-17 17:43:40 +0000832 def_bool y if X86_INTEL_MID
833 prompt "Intel MID APB Timer Support" if X86_INTEL_MID
Jamie Iles06c3df42011-06-06 12:43:07 +0100834 select DW_APB_TIMER
Alan Coxa0c38322011-12-17 21:57:25 +0000835 depends on X86_INTEL_MID && SFI
Jacob Panbb24c472009-09-02 07:37:17 -0700836 help
837 APB timer is the replacement for 8254, HPET on X86 MID platforms.
838 The APBT provides a stable time base on SMP
839 systems, unlike the TSC, but it is more expensive to access,
840 as it is off-chip. APB timers are always running regardless of CPU
841 C states, they are used as per CPU clockevent device when possible.
842
David Rientjes6a108a12011-01-20 14:44:16 -0800843# Mark as expert because too many people got it wrong.
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100844# The code disables itself when not needed.
Thomas Petazzoni7ae93922008-04-28 02:14:14 -0700845config DMI
846 default y
Ard Biesheuvelcf074402014-01-23 15:54:39 -0800847 select DMI_SCAN_MACHINE_NON_EFI_FALLBACK
David Rientjes6a108a12011-01-20 14:44:16 -0800848 bool "Enable DMI scanning" if EXPERT
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100849 ---help---
Thomas Petazzoni7ae93922008-04-28 02:14:14 -0700850 Enabled scanning of DMI to identify machine quirks. Say Y
851 here unless you have verified that your setup is not
852 affected by entries in the DMI blacklist. Required by PNP
853 BIOS code.
854
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100855config GART_IOMMU
Andi Kleen38901f12013-10-04 14:37:56 -0700856 bool "Old AMD GART IOMMU support"
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100857 select SWIOTLB
Andreas Herrmann23ac4ae2010-09-17 18:03:43 +0200858 depends on X86_64 && PCI && AMD_NB
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100859 ---help---
Ingo Molnarced3c422013-10-06 11:45:20 +0200860 Provides a driver for older AMD Athlon64/Opteron/Turion/Sempron
861 GART based hardware IOMMUs.
862
863 The GART supports full DMA access for devices with 32-bit access
864 limitations, on systems with more than 3 GB. This is usually needed
865 for USB, sound, many IDE/SATA chipsets and some other devices.
866
867 Newer systems typically have a modern AMD IOMMU, supported via
868 the CONFIG_AMD_IOMMU=y config option.
869
870 In normal configurations this driver is only active when needed:
871 there's more than 3 GB of memory and the system contains a
872 32-bit limited device.
873
874 If unsure, say Y.
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100875
876config CALGARY_IOMMU
877 bool "IBM Calgary IOMMU support"
878 select SWIOTLB
Kees Cook6ea30382012-10-02 11:16:47 -0700879 depends on X86_64 && PCI
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100880 ---help---
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100881 Support for hardware IOMMUs in IBM's xSeries x366 and x460
882 systems. Needed to run systems with more than 3GB of memory
883 properly with 32-bit PCI devices that do not support DAC
884 (Double Address Cycle). Calgary also supports bus level
885 isolation, where all DMAs pass through the IOMMU. This
886 prevents them from going anywhere except their intended
887 destination. This catches hard-to-find kernel bugs and
888 mis-behaving drivers and devices that do not use the DMA-API
889 properly to set up their DMA buffers. The IOMMU can be
890 turned off at boot time with the iommu=off parameter.
891 Normally the kernel will make the right choice by itself.
892 If unsure, say Y.
893
894config CALGARY_IOMMU_ENABLED_BY_DEFAULT
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100895 def_bool y
896 prompt "Should Calgary be enabled by default?"
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100897 depends on CALGARY_IOMMU
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100898 ---help---
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100899 Should Calgary be enabled by default? if you choose 'y', Calgary
900 will be used (if it exists). If you choose 'n', Calgary will not be
901 used even if it exists. If you choose 'n' and would like to use
902 Calgary anyway, pass 'iommu=calgary' on the kernel command line.
903 If unsure, say Y.
904
905# need this always selected by IOMMU for the VIA workaround
906config SWIOTLB
Joerg Roedela1afd012008-11-18 12:44:21 +0100907 def_bool y if X86_64
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100908 ---help---
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100909 Support for software bounce buffers used on x86-64 systems
Joe Millenbach4454d322012-09-02 17:38:20 -0700910 which don't have a hardware IOMMU. Using this PCI devices
911 which can only access 32-bits of memory can be used on systems
912 with more than 3 GB of memory.
913 If unsure, say Y.
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100914
FUJITA Tomonoria8522502008-04-29 00:59:36 -0700915config IOMMU_HELPER
Jan Beulich3120e252012-09-10 12:41:45 +0100916 def_bool y
917 depends on CALGARY_IOMMU || GART_IOMMU || SWIOTLB || AMD_IOMMU
Linus Torvaldsd25e26b2008-08-25 14:15:38 -0700918
Mike Travis1184dc22008-05-12 21:21:12 +0200919config MAXSMP
Samuel Thibaultddb0c5a2010-08-21 21:32:41 +0200920 bool "Enable Maximum number of SMP Processors and NUMA Nodes"
Kees Cook6ea30382012-10-02 11:16:47 -0700921 depends on X86_64 && SMP && DEBUG_KERNEL
Mike Travis36f51012008-12-16 17:33:51 -0800922 select CPUMASK_OFFSTACK
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100923 ---help---
Samuel Thibaultddb0c5a2010-08-21 21:32:41 +0200924 Enable maximum number of CPUS and NUMA Nodes for this architecture.
Mike Travis1184dc22008-05-12 21:21:12 +0200925 If unsure, say N.
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100926
927config NR_CPUS
Mike Travis36f51012008-12-16 17:33:51 -0800928 int "Maximum number of CPUs" if SMP && !MAXSMP
Michael K. Johnson2a3313f2009-04-21 21:44:48 -0400929 range 2 8 if SMP && X86_32 && !X86_BIGSMP
Josh Boyerbb61ccc2013-11-05 09:37:29 -0500930 range 2 512 if SMP && !MAXSMP && !CPUMASK_OFFSTACK
Josh Boyerb53b5ed2013-11-05 09:38:16 -0500931 range 2 8192 if SMP && !MAXSMP && CPUMASK_OFFSTACK && X86_64
Mike Travis78637a972008-12-16 17:34:00 -0800932 default "1" if !SMP
Josh Boyerb53b5ed2013-11-05 09:38:16 -0500933 default "8192" if MAXSMP
H. Peter Anvinb5660ba2014-02-25 12:14:06 -0800934 default "32" if SMP && X86_BIGSMP
Kirill A. Shutemovc5c19942015-05-08 13:25:45 +0300935 default "8" if SMP && X86_32
936 default "64" if SMP
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100937 ---help---
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100938 This allows you to specify the maximum number of CPUs which this
Josh Boyerbb61ccc2013-11-05 09:37:29 -0500939 kernel will support. If CPUMASK_OFFSTACK is enabled, the maximum
Kirill A. Shutemovcad14bb2015-05-08 13:25:26 +0300940 supported value is 8192, otherwise the maximum value is 512. The
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100941 minimum value which makes sense is 2.
942
943 This is purely to save memory - each supported CPU adds
944 approximately eight kilobytes to the kernel image.
945
946config SCHED_SMT
947 bool "SMT (Hyperthreading) scheduler support"
Borislav Petkovc8e56d22015-06-04 18:55:25 +0200948 depends on SMP
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100949 ---help---
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100950 SMT scheduler support improves the CPU scheduler's decision making
951 when dealing with Intel Pentium 4 chips with HyperThreading at a
952 cost of slightly increased overhead in some places. If unsure say
953 N here.
954
955config SCHED_MC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100956 def_bool y
957 prompt "Multi-core scheduler support"
Borislav Petkovc8e56d22015-06-04 18:55:25 +0200958 depends on SMP
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100959 ---help---
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100960 Multi-core scheduler support improves the CPU scheduler's decision
961 making when dealing with multi-core CPU chips at a cost of slightly
962 increased overhead in some places. If unsure say N here.
963
Tim Chende966cf2016-11-29 10:43:27 -0800964config SCHED_MC_PRIO
965 bool "CPU core priorities scheduler support"
Ingo Molnar0a21fc12016-11-30 08:33:54 +0100966 depends on SCHED_MC && CPU_SUP_INTEL
967 select X86_INTEL_PSTATE
968 select CPU_FREQ
Tim Chende966cf2016-11-29 10:43:27 -0800969 default y
Tim Chen5e76b2a2016-11-22 12:23:55 -0800970 ---help---
Ingo Molnar0a21fc12016-11-30 08:33:54 +0100971 Intel Turbo Boost Max Technology 3.0 enabled CPUs have a
972 core ordering determined at manufacturing time, which allows
973 certain cores to reach higher turbo frequencies (when running
974 single threaded workloads) than others.
Tim Chende966cf2016-11-29 10:43:27 -0800975
Ingo Molnar0a21fc12016-11-30 08:33:54 +0100976 Enabling this kernel feature teaches the scheduler about
977 the TBM3 (aka ITMT) priority order of the CPU cores and adjusts the
978 scheduler's CPU selection logic accordingly, so that higher
979 overall system performance can be achieved.
Tim Chende966cf2016-11-29 10:43:27 -0800980
Ingo Molnar0a21fc12016-11-30 08:33:54 +0100981 This feature will have no effect on CPUs without this feature.
Tim Chende966cf2016-11-29 10:43:27 -0800982
Ingo Molnar0a21fc12016-11-30 08:33:54 +0100983 If unsure say Y here.
Tim Chen5e76b2a2016-11-22 12:23:55 -0800984
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100985source "kernel/Kconfig.preempt"
986
Thomas Gleixner30b8b002015-01-15 21:22:39 +0000987config UP_LATE_INIT
988 def_bool y
Thomas Gleixnerba360f8872015-01-24 10:34:46 +0100989 depends on !SMP && X86_LOCAL_APIC
Thomas Gleixner30b8b002015-01-15 21:22:39 +0000990
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100991config X86_UP_APIC
Jan Beulich50849ee2015-02-05 15:31:56 +0000992 bool "Local APIC support on uniprocessors" if !PCI_MSI
993 default PCI_MSI
Bryan O'Donoghue38a1dfd2015-01-22 22:58:49 +0000994 depends on X86_32 && !SMP && !X86_32_NON_STANDARD
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100995 ---help---
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100996 A local APIC (Advanced Programmable Interrupt Controller) is an
997 integrated interrupt controller in the CPU. If you have a single-CPU
998 system which has a processor with a local APIC, you can say Y here to
999 enable and use it. If you say Y here even though your machine doesn't
1000 have a local APIC, then the kernel will still run with no slowdown at
1001 all. The local APIC supports CPU-generated self-interrupts (timer,
1002 performance counters), and the NMI watchdog which detects hard
1003 lockups.
1004
1005config X86_UP_IOAPIC
1006 bool "IO-APIC support on uniprocessors"
1007 depends on X86_UP_APIC
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001008 ---help---
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001009 An IO-APIC (I/O Advanced Programmable Interrupt Controller) is an
1010 SMP-capable replacement for PC-style interrupt controllers. Most
1011 SMP systems and many recent uniprocessor systems have one.
1012
1013 If you have a single-CPU system with an IO-APIC, you can say Y here
1014 to use it. If you say Y here even though your machine doesn't have
1015 an IO-APIC, then the kernel will still run with no slowdown at all.
1016
1017config X86_LOCAL_APIC
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001018 def_bool y
Thomas Petazzoni0dbc6072013-10-03 11:59:14 +02001019 depends on X86_64 || SMP || X86_32_NON_STANDARD || X86_UP_APIC || PCI_MSI
Jiang Liub5dc8e62015-04-13 14:11:24 +08001020 select IRQ_DOMAIN_HIERARCHY
Jiang Liu52f518a2015-04-13 14:11:35 +08001021 select PCI_MSI_IRQ_DOMAIN if PCI_MSI
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001022
1023config X86_IO_APIC
Jan Beulichb1da1e72015-02-05 15:35:21 +00001024 def_bool y
1025 depends on X86_LOCAL_APIC || X86_UP_IOAPIC
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001026
Stefan Assmann41b9eb22008-07-15 13:48:55 +02001027config X86_REROUTE_FOR_BROKEN_BOOT_IRQS
1028 bool "Reroute for broken boot IRQs"
Stefan Assmann41b9eb22008-07-15 13:48:55 +02001029 depends on X86_IO_APIC
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001030 ---help---
Stefan Assmann41b9eb22008-07-15 13:48:55 +02001031 This option enables a workaround that fixes a source of
1032 spurious interrupts. This is recommended when threaded
1033 interrupt handling is used on systems where the generation of
1034 superfluous "boot interrupts" cannot be disabled.
1035
1036 Some chipsets generate a legacy INTx "boot IRQ" when the IRQ
1037 entry in the chipset's IO-APIC is masked (as, e.g. the RT
1038 kernel does during interrupt handling). On chipsets where this
1039 boot IRQ generation cannot be disabled, this workaround keeps
1040 the original IRQ line masked so that only the equivalent "boot
1041 IRQ" is delivered to the CPUs. The workaround also tells the
1042 kernel to set up the IRQ handler on the boot IRQ line. In this
1043 way only one interrupt is delivered to the kernel. Otherwise
1044 the spurious second interrupt may cause the kernel to bring
1045 down (vital) interrupt lines.
1046
1047 Only affects "broken" chipsets. Interrupt sharing may be
1048 increased on these systems.
1049
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001050config X86_MCE
Andi Kleenbab9bc62009-07-09 00:31:38 +02001051 bool "Machine Check / overheating reporting"
Chen, Gong648ed942015-08-12 18:29:34 +02001052 select GENERIC_ALLOCATOR
Borislav Petkove57dbaf2011-09-13 15:23:21 +02001053 default y
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001054 ---help---
Andi Kleenbab9bc62009-07-09 00:31:38 +02001055 Machine Check support allows the processor to notify the
1056 kernel if it detects a problem (e.g. overheating, data corruption).
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001057 The action the kernel takes depends on the severity of the problem,
Andi Kleenbab9bc62009-07-09 00:31:38 +02001058 ranging from warning messages to halting the machine.
Andi Kleen4efc0672009-04-28 19:07:31 +02001059
Tony Luck5de97c92017-03-27 11:33:03 +02001060config X86_MCELOG_LEGACY
1061 bool "Support for deprecated /dev/mcelog character device"
1062 depends on X86_MCE
1063 ---help---
1064 Enable support for /dev/mcelog which is needed by the old mcelog
1065 userspace logging daemon. Consider switching to the new generation
1066 rasdaemon solution.
1067
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001068config X86_MCE_INTEL
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001069 def_bool y
1070 prompt "Intel MCE features"
Andi Kleenc1ebf832009-07-09 00:31:41 +02001071 depends on X86_MCE && X86_LOCAL_APIC
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001072 ---help---
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001073 Additional support for intel specific MCE features such as
1074 the thermal monitor.
1075
1076config X86_MCE_AMD
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001077 def_bool y
1078 prompt "AMD MCE features"
Yazen Ghannamf5382de2016-11-17 17:57:27 -05001079 depends on X86_MCE && X86_LOCAL_APIC && AMD_NB
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001080 ---help---
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001081 Additional support for AMD specific MCE features such as
1082 the DRAM Error Threshold.
1083
Andi Kleen4efc0672009-04-28 19:07:31 +02001084config X86_ANCIENT_MCE
Jan Beulich6fc108a2010-04-21 15:23:44 +01001085 bool "Support for old Pentium 5 / WinChip machine checks"
Andi Kleenc31d9632009-07-09 00:31:37 +02001086 depends on X86_32 && X86_MCE
Hidetoshi Setocd13adcc2009-05-27 16:57:31 +09001087 ---help---
1088 Include support for machine check handling on old Pentium 5 or WinChip
Masanari Iida5065a702013-11-30 21:38:43 +09001089 systems. These typically need to be enabled explicitly on the command
Hidetoshi Setocd13adcc2009-05-27 16:57:31 +09001090 line.
Andi Kleen4efc0672009-04-28 19:07:31 +02001091
Andi Kleenb2762682009-02-12 13:49:31 +01001092config X86_MCE_THRESHOLD
1093 depends on X86_MCE_AMD || X86_MCE_INTEL
Jan Beulich6fc108a2010-04-21 15:23:44 +01001094 def_bool y
Andi Kleenb2762682009-02-12 13:49:31 +01001095
Andi Kleenea149b32009-04-29 19:31:00 +02001096config X86_MCE_INJECT
Borislav Petkovbc8e80d2017-06-13 18:28:30 +02001097 depends on X86_MCE && X86_LOCAL_APIC && DEBUG_FS
Andi Kleenea149b32009-04-29 19:31:00 +02001098 tristate "Machine check injector support"
1099 ---help---
1100 Provide support for injecting machine checks for testing purposes.
1101 If you don't know what a machine check is and you don't do kernel
1102 QA it is safe to say n.
1103
Andi Kleen4efc0672009-04-28 19:07:31 +02001104config X86_THERMAL_VECTOR
1105 def_bool y
Andi Kleen5bb38ad2009-07-09 00:31:39 +02001106 depends on X86_MCE_INTEL
Andi Kleen4efc0672009-04-28 19:07:31 +02001107
Peter Zijlstra07dc9002016-03-29 14:30:35 +02001108source "arch/x86/events/Kconfig"
Kan Liange633c652016-03-20 01:33:36 -07001109
Andy Lutomirski5aef51c2015-07-10 08:34:23 -07001110config X86_LEGACY_VM86
Ingo Molnar1e642812015-09-05 08:58:10 +02001111 bool "Legacy VM86 support"
Andy Lutomirski5aef51c2015-07-10 08:34:23 -07001112 default n
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001113 depends on X86_32
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001114 ---help---
Andy Lutomirski5aef51c2015-07-10 08:34:23 -07001115 This option allows user programs to put the CPU into V8086
1116 mode, which is an 80286-era approximation of 16-bit real mode.
1117
1118 Some very old versions of X and/or vbetool require this option
1119 for user mode setting. Similarly, DOSEMU will use it if
1120 available to accelerate real mode DOS programs. However, any
1121 recent version of DOSEMU, X, or vbetool should be fully
1122 functional even without kernel VM86 support, as they will all
Ingo Molnar1e642812015-09-05 08:58:10 +02001123 fall back to software emulation. Nevertheless, if you are using
1124 a 16-bit DOS program where 16-bit performance matters, vm86
1125 mode might be faster than emulation and you might want to
1126 enable this option.
Andy Lutomirski5aef51c2015-07-10 08:34:23 -07001127
Ingo Molnar1e642812015-09-05 08:58:10 +02001128 Note that any app that works on a 64-bit kernel is unlikely to
1129 need this option, as 64-bit kernels don't, and can't, support
1130 V8086 mode. This option is also unrelated to 16-bit protected
1131 mode and is not needed to run most 16-bit programs under Wine.
Andy Lutomirski5aef51c2015-07-10 08:34:23 -07001132
Ingo Molnar1e642812015-09-05 08:58:10 +02001133 Enabling this option increases the complexity of the kernel
1134 and slows down exception handling a tiny bit.
Andy Lutomirski5aef51c2015-07-10 08:34:23 -07001135
Ingo Molnar1e642812015-09-05 08:58:10 +02001136 If unsure, say N here.
Andy Lutomirski5aef51c2015-07-10 08:34:23 -07001137
1138config VM86
1139 bool
1140 default X86_LEGACY_VM86
H. Peter Anvin34273f42014-05-04 10:36:22 -07001141
1142config X86_16BIT
1143 bool "Enable support for 16-bit segments" if EXPERT
1144 default y
Andy Lutomirskia5b9e5a2015-07-30 14:31:34 -07001145 depends on MODIFY_LDT_SYSCALL
H. Peter Anvin34273f42014-05-04 10:36:22 -07001146 ---help---
1147 This option is required by programs like Wine to run 16-bit
1148 protected mode legacy code on x86 processors. Disabling
1149 this option saves about 300 bytes on i386, or around 6K text
1150 plus 16K runtime memory on x86-64,
1151
1152config X86_ESPFIX32
1153 def_bool y
1154 depends on X86_16BIT && X86_32
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001155
H. Peter Anvin197725d2014-05-04 10:00:49 -07001156config X86_ESPFIX64
1157 def_bool y
H. Peter Anvin34273f42014-05-04 10:36:22 -07001158 depends on X86_16BIT && X86_64
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001159
Andy Lutomirski1ad83c82014-10-29 14:33:47 -07001160config X86_VSYSCALL_EMULATION
1161 bool "Enable vsyscall emulation" if EXPERT
1162 default y
1163 depends on X86_64
1164 ---help---
1165 This enables emulation of the legacy vsyscall page. Disabling
1166 it is roughly equivalent to booting with vsyscall=none, except
1167 that it will also disable the helpful warning if a program
1168 tries to use a vsyscall. With this option set to N, offending
1169 programs will just segfault, citing addresses of the form
1170 0xffffffffff600?00.
1171
1172 This option is required by many programs built before 2013, and
1173 care should be used even with newer programs if set to N.
1174
1175 Disabling this option saves about 7K of kernel size and
1176 possibly 4K of additional runtime pagetable memory.
1177
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001178config TOSHIBA
1179 tristate "Toshiba Laptop support"
1180 depends on X86_32
1181 ---help---
1182 This adds a driver to safely access the System Management Mode of
1183 the CPU on Toshiba portables with a genuine Toshiba BIOS. It does
1184 not work on models with a Phoenix BIOS. The System Management Mode
1185 is used to set the BIOS and power saving options on Toshiba portables.
1186
1187 For information on utilities to make use of this driver see the
1188 Toshiba Linux utilities web site at:
1189 <http://www.buzzard.org.uk/toshiba/>.
1190
1191 Say Y if you intend to run this kernel on a Toshiba portable.
1192 Say N otherwise.
1193
1194config I8K
Pali Rohár039ae582015-05-14 13:16:37 +02001195 tristate "Dell i8k legacy laptop support"
Jean Delvare949a9d72011-05-25 20:43:33 +02001196 select HWMON
Pali Rohár039ae582015-05-14 13:16:37 +02001197 select SENSORS_DELL_SMM
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001198 ---help---
Pali Rohár039ae582015-05-14 13:16:37 +02001199 This option enables legacy /proc/i8k userspace interface in hwmon
1200 dell-smm-hwmon driver. Character file /proc/i8k reports bios version,
1201 temperature and allows controlling fan speeds of Dell laptops via
1202 System Management Mode. For old Dell laptops (like Dell Inspiron 8000)
1203 it reports also power and hotkey status. For fan speed control is
1204 needed userspace package i8kutils.
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001205
Pali Rohár039ae582015-05-14 13:16:37 +02001206 Say Y if you intend to run this kernel on old Dell laptops or want to
1207 use userspace package i8kutils.
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001208 Say N otherwise.
1209
1210config X86_REBOOTFIXUPS
Jan Beulich9ba16082008-10-15 22:01:38 -07001211 bool "Enable X86 board specific fixups for reboot"
1212 depends on X86_32
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001213 ---help---
1214 This enables chipset and/or board specific fixups to be done
1215 in order to get reboot to work correctly. This is only needed on
1216 some combinations of hardware and BIOS. The symptom, for which
1217 this config is intended, is when reboot ends with a stalled/hung
1218 system.
1219
1220 Currently, the only fixup is for the Geode machines using
Florian Fainelli5e3a77e2008-01-30 13:33:36 +01001221 CS5530A and CS5536 chipsets and the RDC R-321x SoC.
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001222
1223 Say Y if you want to enable the fixup. Currently, it's safe to
1224 enable this option even if you don't need it.
1225 Say N otherwise.
1226
1227config MICROCODE
Borislav Petkov9a2bc332015-10-20 11:54:44 +02001228 bool "CPU microcode loading support"
1229 default y
Borislav Petkov80030e32013-10-13 18:36:29 +02001230 depends on CPU_SUP_AMD || CPU_SUP_INTEL
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001231 select FW_LOADER
1232 ---help---
1233 If you say Y here, you will be able to update the microcode on
Borislav Petkov5f9c01a2016-02-03 12:33:29 +01001234 Intel and AMD processors. The Intel support is for the IA32 family,
1235 e.g. Pentium Pro, Pentium II, Pentium III, Pentium 4, Xeon etc. The
1236 AMD support is for families 0x10 and later. You will obviously need
1237 the actual microcode binary data itself which is not shipped with
1238 the Linux kernel.
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001239
Borislav Petkov5f9c01a2016-02-03 12:33:29 +01001240 The preferred method to load microcode from a detached initrd is described
1241 in Documentation/x86/early-microcode.txt. For that you need to enable
1242 CONFIG_BLK_DEV_INITRD in order for the loader to be able to scan the
1243 initrd for microcode blobs.
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001244
Borislav Petkov5f9c01a2016-02-03 12:33:29 +01001245 In addition, you can build-in the microcode into the kernel. For that you
1246 need to enable FIRMWARE_IN_KERNEL and add the vendor-supplied microcode
1247 to the CONFIG_EXTRA_FIRMWARE config option.
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001248
Peter Oruba8d86f392008-07-28 18:44:21 +02001249config MICROCODE_INTEL
Borislav Petkove43f6e62012-08-01 19:17:01 +02001250 bool "Intel microcode loading support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001251 depends on MICROCODE
1252 default MICROCODE
1253 select FW_LOADER
1254 ---help---
1255 This options enables microcode patch loading support for Intel
1256 processors.
Peter Oruba8d86f392008-07-28 18:44:21 +02001257
Alanb8989db2014-01-20 18:01:56 +00001258 For the current Intel microcode data package go to
1259 <https://downloadcenter.intel.com> and search for
1260 'Linux Processor Microcode Data File'.
Peter Oruba8d86f392008-07-28 18:44:21 +02001261
Peter Oruba80cc9f12008-07-28 18:44:22 +02001262config MICROCODE_AMD
Borislav Petkove43f6e62012-08-01 19:17:01 +02001263 bool "AMD microcode loading support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001264 depends on MICROCODE
1265 select FW_LOADER
1266 ---help---
1267 If you select this option, microcode patch loading support for AMD
1268 processors will be enabled.
Peter Oruba80cc9f12008-07-28 18:44:22 +02001269
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001270config MICROCODE_OLD_INTERFACE
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001271 def_bool y
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001272 depends on MICROCODE
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001273
1274config X86_MSR
1275 tristate "/dev/cpu/*/msr - Model-specific register support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001276 ---help---
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001277 This device gives privileged processes access to the x86
1278 Model-Specific Registers (MSRs). It is a character device with
1279 major 202 and minors 0 to 31 for /dev/cpu/0/msr to /dev/cpu/31/msr.
1280 MSR accesses are directed to a specific CPU on multi-processor
1281 systems.
1282
1283config X86_CPUID
1284 tristate "/dev/cpu/*/cpuid - CPU information support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001285 ---help---
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001286 This device gives processes access to the x86 CPUID instruction to
1287 be executed on a specific processor. It is a character device
1288 with major 203 and minors 0 to 31 for /dev/cpu/0/cpuid to
1289 /dev/cpu/31/cpuid.
1290
1291choice
1292 prompt "High Memory Support"
Jan Beulich6fc108a2010-04-21 15:23:44 +01001293 default HIGHMEM4G
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001294 depends on X86_32
1295
1296config NOHIGHMEM
1297 bool "off"
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001298 ---help---
1299 Linux can use up to 64 Gigabytes of physical memory on x86 systems.
1300 However, the address space of 32-bit x86 processors is only 4
1301 Gigabytes large. That means that, if you have a large amount of
1302 physical memory, not all of it can be "permanently mapped" by the
1303 kernel. The physical memory that's not permanently mapped is called
1304 "high memory".
1305
1306 If you are compiling a kernel which will never run on a machine with
1307 more than 1 Gigabyte total physical RAM, answer "off" here (default
1308 choice and suitable for most users). This will result in a "3GB/1GB"
1309 split: 3GB are mapped so that each process sees a 3GB virtual memory
1310 space and the remaining part of the 4GB virtual memory space is used
1311 by the kernel to permanently map as much physical memory as
1312 possible.
1313
1314 If the machine has between 1 and 4 Gigabytes physical RAM, then
1315 answer "4GB" here.
1316
1317 If more than 4 Gigabytes is used then answer "64GB" here. This
1318 selection turns Intel PAE (Physical Address Extension) mode on.
1319 PAE implements 3-level paging on IA32 processors. PAE is fully
1320 supported by Linux, PAE mode is implemented on all recent Intel
1321 processors (Pentium Pro and better). NOTE: If you say "64GB" here,
1322 then the kernel will not boot on CPUs that don't support PAE!
1323
1324 The actual amount of total physical memory will either be
1325 auto detected or can be forced by using a kernel command line option
1326 such as "mem=256M". (Try "man bootparam" or see the documentation of
1327 your boot loader (lilo or loadlin) about how to pass options to the
1328 kernel at boot time.)
1329
1330 If unsure, say "off".
1331
1332config HIGHMEM4G
1333 bool "4GB"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001334 ---help---
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001335 Select this if you have a 32-bit processor and between 1 and 4
1336 gigabytes of physical RAM.
1337
1338config HIGHMEM64G
1339 bool "64GB"
H. Peter Anvineb068e72012-11-28 11:50:23 -08001340 depends on !M486
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001341 select X86_PAE
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001342 ---help---
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001343 Select this if you have a 32-bit processor and more than 4
1344 gigabytes of physical RAM.
1345
1346endchoice
1347
1348choice
David Rientjes6a108a12011-01-20 14:44:16 -08001349 prompt "Memory split" if EXPERT
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001350 default VMSPLIT_3G
1351 depends on X86_32
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001352 ---help---
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001353 Select the desired split between kernel and user memory.
1354
1355 If the address range available to the kernel is less than the
1356 physical memory installed, the remaining memory will be available
1357 as "high memory". Accessing high memory is a little more costly
1358 than low memory, as it needs to be mapped into the kernel first.
1359 Note that increasing the kernel address space limits the range
1360 available to user programs, making the address space there
1361 tighter. Selecting anything other than the default 3G/1G split
1362 will also likely make your kernel incompatible with binary-only
1363 kernel modules.
1364
1365 If you are not absolutely sure what you are doing, leave this
1366 option alone!
1367
1368 config VMSPLIT_3G
1369 bool "3G/1G user/kernel split"
1370 config VMSPLIT_3G_OPT
1371 depends on !X86_PAE
1372 bool "3G/1G user/kernel split (for full 1G low memory)"
1373 config VMSPLIT_2G
1374 bool "2G/2G user/kernel split"
1375 config VMSPLIT_2G_OPT
1376 depends on !X86_PAE
1377 bool "2G/2G user/kernel split (for full 2G low memory)"
1378 config VMSPLIT_1G
1379 bool "1G/3G user/kernel split"
1380endchoice
1381
1382config PAGE_OFFSET
1383 hex
1384 default 0xB0000000 if VMSPLIT_3G_OPT
1385 default 0x80000000 if VMSPLIT_2G
1386 default 0x78000000 if VMSPLIT_2G_OPT
1387 default 0x40000000 if VMSPLIT_1G
1388 default 0xC0000000
1389 depends on X86_32
1390
1391config HIGHMEM
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001392 def_bool y
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001393 depends on X86_32 && (HIGHMEM64G || HIGHMEM4G)
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001394
1395config X86_PAE
Jan Beulich9ba16082008-10-15 22:01:38 -07001396 bool "PAE (Physical Address Extension) Support"
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001397 depends on X86_32 && !HIGHMEM4G
Christian Melki9d99c712015-10-05 17:31:33 +02001398 select SWIOTLB
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001399 ---help---
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001400 PAE is required for NX support, and furthermore enables
1401 larger swapspace support for non-overcommit purposes. It
1402 has the cost of more pagetable lookup overhead, and also
1403 consumes more pagetable space per process.
1404
Kirill A. Shutemov77ef56e2017-07-17 01:59:54 +03001405config X86_5LEVEL
1406 bool "Enable 5-level page tables support"
1407 depends on X86_64
1408 ---help---
1409 5-level paging enables access to larger address space:
1410 upto 128 PiB of virtual address space and 4 PiB of
1411 physical address space.
1412
1413 It will be supported by future Intel CPUs.
1414
1415 Note: a kernel with this option enabled can only be booted
1416 on machines that support the feature.
1417
1418 See Documentation/x86/x86_64/5level-paging.txt for more
1419 information.
1420
1421 Say N if unsure.
1422
Jeremy Fitzhardinge600715d2008-09-11 01:31:45 -07001423config ARCH_PHYS_ADDR_T_64BIT
Jan Beulich3120e252012-09-10 12:41:45 +01001424 def_bool y
1425 depends on X86_64 || X86_PAE
Jeremy Fitzhardinge600715d2008-09-11 01:31:45 -07001426
FUJITA Tomonori66f2b062010-10-20 15:55:35 -07001427config ARCH_DMA_ADDR_T_64BIT
Jan Beulich3120e252012-09-10 12:41:45 +01001428 def_bool y
1429 depends on X86_64 || HIGHMEM64G
FUJITA Tomonori66f2b062010-10-20 15:55:35 -07001430
Ingo Molnar10971ab2015-03-05 08:18:23 +01001431config X86_DIRECT_GBPAGES
Luis R. Rodrigueze5008ab2015-03-04 17:24:12 -08001432 def_bool y
Levin, Alexander (Sasha Levin)4675ff02017-11-15 17:36:02 -08001433 depends on X86_64 && !DEBUG_PAGEALLOC
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001434 ---help---
Ingo Molnar10971ab2015-03-05 08:18:23 +01001435 Certain kernel features effectively disable kernel
1436 linear 1 GB mappings (even if the CPU otherwise
1437 supports them), so don't confuse the user by printing
1438 that we have them enabled.
Nick Piggin9e899812008-10-22 12:33:16 +02001439
Tom Lendacky7744ccd2017-07-17 16:10:03 -05001440config ARCH_HAS_MEM_ENCRYPT
1441 def_bool y
1442
1443config AMD_MEM_ENCRYPT
1444 bool "AMD Secure Memory Encryption (SME) support"
1445 depends on X86_64 && CPU_SUP_AMD
1446 ---help---
1447 Say yes to enable support for the encryption of system memory.
1448 This requires an AMD processor that supports Secure Memory
1449 Encryption (SME).
1450
1451config AMD_MEM_ENCRYPT_ACTIVE_BY_DEFAULT
1452 bool "Activate AMD Secure Memory Encryption (SME) by default"
1453 default y
1454 depends on AMD_MEM_ENCRYPT
1455 ---help---
1456 Say yes to have system memory encrypted by default if running on
1457 an AMD processor that supports Secure Memory Encryption (SME).
1458
1459 If set to Y, then the encryption of system memory can be
1460 deactivated with the mem_encrypt=off command line option.
1461
1462 If set to N, then the encryption of system memory can be
1463 activated with the mem_encrypt=on command line option.
1464
Tom Lendackyf88a68f2017-07-17 16:10:09 -05001465config ARCH_USE_MEMREMAP_PROT
1466 def_bool y
1467 depends on AMD_MEM_ENCRYPT
1468
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001469# Common NUMA Features
1470config NUMA
KOSAKI Motohirofd51b2d2008-11-05 02:27:19 +09001471 bool "Numa Memory Allocation and Scheduler Support"
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001472 depends on SMP
H. Peter Anvinb5660ba2014-02-25 12:14:06 -08001473 depends on X86_64 || (X86_32 && HIGHMEM64G && X86_BIGSMP)
1474 default y if X86_BIGSMP
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001475 ---help---
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001476 Enable NUMA (Non Uniform Memory Access) support.
KOSAKI Motohirofd51b2d2008-11-05 02:27:19 +09001477
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001478 The kernel will try to allocate memory used by a CPU on the
1479 local memory controller of the CPU and add some more
1480 NUMA awareness to the kernel.
1481
Ingo Molnarc280ea52008-11-08 13:29:45 +01001482 For 64-bit this is recommended if the system is Intel Core i7
KOSAKI Motohirofd51b2d2008-11-05 02:27:19 +09001483 (or later), AMD Opteron, or EM64T NUMA.
1484
H. Peter Anvinb5660ba2014-02-25 12:14:06 -08001485 For 32-bit this is only needed if you boot a 32-bit
David Rientjes7cf6c942014-02-11 18:11:13 -08001486 kernel on a 64-bit NUMA platform.
KOSAKI Motohirofd51b2d2008-11-05 02:27:19 +09001487
1488 Otherwise, you should say N.
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001489
Hans Rosenfeldeec1d4f2010-10-29 17:14:30 +02001490config AMD_NUMA
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001491 def_bool y
1492 prompt "Old style AMD Opteron NUMA detection"
Tejun Heo5da0ef92011-07-11 10:34:32 +02001493 depends on X86_64 && NUMA && PCI
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001494 ---help---
Hans Rosenfeldeec1d4f2010-10-29 17:14:30 +02001495 Enable AMD NUMA node topology detection. You should say Y here if
1496 you have a multi processor AMD system. This uses an old method to
1497 read the NUMA configuration directly from the builtin Northbridge
1498 of Opteron. It is recommended to use X86_64_ACPI_NUMA instead,
1499 which also takes priority if both are compiled in.
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001500
1501config X86_64_ACPI_NUMA
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001502 def_bool y
1503 prompt "ACPI NUMA detection"
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001504 depends on X86_64 && NUMA && ACPI && PCI
1505 select ACPI_NUMA
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001506 ---help---
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001507 Enable ACPI SRAT based node topology detection.
1508
Suresh Siddha6ec6e0d2008-03-25 10:14:35 -07001509# Some NUMA nodes have memory ranges that span
1510# other nodes. Even though a pfn is valid and
1511# between a node's start and end pfns, it may not
1512# reside on that node. See memmap_init_zone()
1513# for details.
1514config NODES_SPAN_OTHER_NODES
1515 def_bool y
1516 depends on X86_64_ACPI_NUMA
1517
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001518config NUMA_EMU
1519 bool "NUMA emulation"
Tejun Heo1b7e03e2011-05-02 17:24:48 +02001520 depends on NUMA
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001521 ---help---
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001522 Enable NUMA emulation. A flat machine will be split
1523 into virtual nodes when booted with "numa=fake=N", where N is the
1524 number of nodes. This is only useful for debugging.
1525
1526config NODES_SHIFT
Linus Torvaldsd25e26b2008-08-25 14:15:38 -07001527 int "Maximum NUMA Nodes (as a power of 2)" if !MAXSMP
David Rientjes51591e32010-03-25 15:39:27 -07001528 range 1 10
1529 default "10" if MAXSMP
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001530 default "6" if X86_64
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001531 default "3"
1532 depends on NEED_MULTIPLE_NODES
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001533 ---help---
Mike Travis1184dc22008-05-12 21:21:12 +02001534 Specify the maximum number of NUMA Nodes available on the target
Matt LaPlante692105b2009-01-26 11:12:25 +01001535 system. Increases memory reserved to accommodate various tables.
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001536
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001537config ARCH_HAVE_MEMORY_PRESENT
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001538 def_bool y
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001539 depends on X86_32 && DISCONTIGMEM
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001540
1541config NEED_NODE_MEMMAP_SIZE
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001542 def_bool y
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001543 depends on X86_32 && (DISCONTIGMEM || SPARSEMEM)
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001544
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001545config ARCH_FLATMEM_ENABLE
1546 def_bool y
Tejun Heo3b166512011-04-01 11:15:12 +02001547 depends on X86_32 && !NUMA
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001548
1549config ARCH_DISCONTIGMEM_ENABLE
1550 def_bool y
Christoph Lameterb2632952008-01-30 13:30:47 +01001551 depends on NUMA && X86_32
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001552
1553config ARCH_DISCONTIGMEM_DEFAULT
1554 def_bool y
Christoph Lameterb2632952008-01-30 13:30:47 +01001555 depends on NUMA && X86_32
1556
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001557config ARCH_SPARSEMEM_ENABLE
1558 def_bool y
Kees Cook6ea30382012-10-02 11:16:47 -07001559 depends on X86_64 || NUMA || X86_32 || X86_32_NON_STANDARD
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001560 select SPARSEMEM_STATIC if X86_32
1561 select SPARSEMEM_VMEMMAP_ENABLE if X86_64
1562
Tejun Heo3b166512011-04-01 11:15:12 +02001563config ARCH_SPARSEMEM_DEFAULT
1564 def_bool y
1565 depends on X86_64
1566
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001567config ARCH_SELECT_MEMORY_MODEL
1568 def_bool y
Christoph Lameterb2632952008-01-30 13:30:47 +01001569 depends on ARCH_SPARSEMEM_ENABLE
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001570
1571config ARCH_MEMORY_PROBE
Toshi Kania0842b72013-07-19 11:47:48 -06001572 bool "Enable sysfs memory/probe interface"
Jan Beulich3120e252012-09-10 12:41:45 +01001573 depends on X86_64 && MEMORY_HOTPLUG
Toshi Kania0842b72013-07-19 11:47:48 -06001574 help
1575 This option enables a sysfs memory/probe interface for testing.
1576 See Documentation/memory-hotplug.txt for more information.
1577 If you are unsure how to answer this question, answer N.
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001578
Tejun Heo3b166512011-04-01 11:15:12 +02001579config ARCH_PROC_KCORE_TEXT
1580 def_bool y
1581 depends on X86_64 && PROC_KCORE
1582
Avi Kivitya29815a2010-01-10 16:28:09 +02001583config ILLEGAL_POINTER_VALUE
1584 hex
1585 default 0 if X86_32
1586 default 0xdead000000000000 if X86_64
1587
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001588source "mm/Kconfig"
1589
Dan Williams7a678322015-08-19 00:34:34 -04001590config X86_PMEM_LEGACY_DEVICE
1591 bool
1592
Christoph Hellwigec776ef2015-04-01 09:12:18 +02001593config X86_PMEM_LEGACY
Dan Williams7a678322015-08-19 00:34:34 -04001594 tristate "Support non-standard NVDIMMs and ADR protected memory"
Dan Williams9f53f9f2015-06-09 15:33:45 -04001595 depends on PHYS_ADDR_T_64BIT
1596 depends on BLK_DEV
Dan Williams7a678322015-08-19 00:34:34 -04001597 select X86_PMEM_LEGACY_DEVICE
Dan Williams9f53f9f2015-06-09 15:33:45 -04001598 select LIBNVDIMM
Christoph Hellwigec776ef2015-04-01 09:12:18 +02001599 help
1600 Treat memory marked using the non-standard e820 type of 12 as used
1601 by the Intel Sandy Bridge-EP reference BIOS as protected memory.
1602 The kernel will offer these regions to the 'pmem' driver so
1603 they can be used for persistent storage.
1604
1605 Say Y if unsure.
1606
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001607config HIGHPTE
1608 bool "Allocate 3rd-level pagetables from highmem"
Jan Beulich6fc108a2010-04-21 15:23:44 +01001609 depends on HIGHMEM
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001610 ---help---
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001611 The VM uses one page table entry for each page of physical memory.
1612 For systems with a lot of RAM, this can be wasteful of precious
1613 low memory. Setting this option will put user-space page table
1614 entries in high memory.
1615
Jeremy Fitzhardinge9f077872008-09-07 01:51:34 -07001616config X86_CHECK_BIOS_CORRUPTION
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001617 bool "Check for low memory corruption"
1618 ---help---
1619 Periodically check for memory corruption in low memory, which
1620 is suspected to be caused by BIOS. Even when enabled in the
1621 configuration, it is disabled at runtime. Enable it by
1622 setting "memory_corruption_check=1" on the kernel command
1623 line. By default it scans the low 64k of memory every 60
1624 seconds; see the memory_corruption_check_size and
1625 memory_corruption_check_period parameters in
Mauro Carvalho Chehab8c27ceff32016-10-18 10:12:27 -02001626 Documentation/admin-guide/kernel-parameters.rst to adjust this.
Jeremy Fitzhardinge9f077872008-09-07 01:51:34 -07001627
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001628 When enabled with the default parameters, this option has
1629 almost no overhead, as it reserves a relatively small amount
1630 of memory and scans it infrequently. It both detects corruption
1631 and prevents it from affecting the running system.
Jeremy Fitzhardinge9f077872008-09-07 01:51:34 -07001632
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001633 It is, however, intended as a diagnostic tool; if repeatable
1634 BIOS-originated corruption always affects the same memory,
1635 you can use memmap= to prevent the kernel from using that
1636 memory.
Jeremy Fitzhardinge9f077872008-09-07 01:51:34 -07001637
Jeremy Fitzhardingec885df52008-09-07 02:37:32 -07001638config X86_BOOTPARAM_MEMORY_CORRUPTION_CHECK
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001639 bool "Set the default setting of memory_corruption_check"
Jeremy Fitzhardingec885df52008-09-07 02:37:32 -07001640 depends on X86_CHECK_BIOS_CORRUPTION
1641 default y
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001642 ---help---
1643 Set whether the default state of memory_corruption_check is
1644 on or off.
Jeremy Fitzhardingec885df52008-09-07 02:37:32 -07001645
H. Peter Anvin9ea77bd2010-08-25 16:38:20 -07001646config X86_RESERVE_LOW
H. Peter Anvind0cd7422010-08-24 17:32:04 -07001647 int "Amount of low memory, in kilobytes, to reserve for the BIOS"
1648 default 64
1649 range 4 640
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001650 ---help---
H. Peter Anvind0cd7422010-08-24 17:32:04 -07001651 Specify the amount of low memory to reserve for the BIOS.
Ingo Molnarfc381512008-09-16 10:07:34 +02001652
H. Peter Anvind0cd7422010-08-24 17:32:04 -07001653 The first page contains BIOS data structures that the kernel
1654 must not use, so that page must always be reserved.
Ingo Molnarfc381512008-09-16 10:07:34 +02001655
H. Peter Anvind0cd7422010-08-24 17:32:04 -07001656 By default we reserve the first 64K of physical RAM, as a
1657 number of BIOSes are known to corrupt that memory range
1658 during events such as suspend/resume or monitor cable
1659 insertion, so it must not be used by the kernel.
Ingo Molnarfc381512008-09-16 10:07:34 +02001660
H. Peter Anvind0cd7422010-08-24 17:32:04 -07001661 You can set this to 4 if you are absolutely sure that you
1662 trust the BIOS to get all its memory reservations and usages
1663 right. If you know your BIOS have problems beyond the
1664 default 64K area, you can set this to 640 to avoid using the
1665 entire low memory range.
1666
1667 If you have doubts about the BIOS (e.g. suspend/resume does
1668 not work or there's kernel crashes after certain hardware
1669 hotplug events) then you might want to enable
1670 X86_CHECK_BIOS_CORRUPTION=y to allow the kernel to check
1671 typical corruption patterns.
1672
1673 Leave this to the default value of 64 if you are unsure.
Ingo Molnarfc381512008-09-16 10:07:34 +02001674
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001675config MATH_EMULATION
1676 bool
Andy Lutomirskia5b9e5a2015-07-30 14:31:34 -07001677 depends on MODIFY_LDT_SYSCALL
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001678 prompt "Math emulation" if X86_32
1679 ---help---
1680 Linux can emulate a math coprocessor (used for floating point
1681 operations) if you don't have one. 486DX and Pentium processors have
1682 a math coprocessor built in, 486SX and 386 do not, unless you added
1683 a 487DX or 387, respectively. (The messages during boot time can
1684 give you some hints here ["man dmesg"].) Everyone needs either a
1685 coprocessor or this emulation.
1686
1687 If you don't have a math coprocessor, you need to say Y here; if you
1688 say Y here even though you have a coprocessor, the coprocessor will
1689 be used nevertheless. (This behavior can be changed with the kernel
1690 command line option "no387", which comes handy if your coprocessor
1691 is broken. Try "man bootparam" or see the documentation of your boot
1692 loader (lilo or loadlin) about how to pass options to the kernel at
1693 boot time.) This means that it is a good idea to say Y here if you
1694 intend to use this kernel on different machines.
1695
1696 More information about the internals of the Linux math coprocessor
1697 emulation can be found in <file:arch/x86/math-emu/README>.
1698
1699 If you are not sure, say Y; apart from resulting in a 66 KB bigger
1700 kernel, it won't hurt.
1701
1702config MTRR
Jan Beulich6fc108a2010-04-21 15:23:44 +01001703 def_bool y
David Rientjes6a108a12011-01-20 14:44:16 -08001704 prompt "MTRR (Memory Type Range Register) support" if EXPERT
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001705 ---help---
1706 On Intel P6 family processors (Pentium Pro, Pentium II and later)
1707 the Memory Type Range Registers (MTRRs) may be used to control
1708 processor access to memory ranges. This is most useful if you have
1709 a video (VGA) card on a PCI or AGP bus. Enabling write-combining
1710 allows bus write transfers to be combined into a larger transfer
1711 before bursting over the PCI/AGP bus. This can increase performance
1712 of image write operations 2.5 times or more. Saying Y here creates a
1713 /proc/mtrr file which may be used to manipulate your processor's
1714 MTRRs. Typically the X server should use this.
1715
1716 This code has a reasonably generic interface so that similar
1717 control registers on other processors can be easily supported
1718 as well:
1719
1720 The Cyrix 6x86, 6x86MX and M II processors have Address Range
1721 Registers (ARRs) which provide a similar functionality to MTRRs. For
1722 these, the ARRs are used to emulate the MTRRs.
1723 The AMD K6-2 (stepping 8 and above) and K6-3 processors have two
1724 MTRRs. The Centaur C6 (WinChip) has 8 MCRs, allowing
1725 write-combining. All of these processors are supported by this code
1726 and it makes sense to say Y here if you have one of them.
1727
1728 Saying Y here also fixes a problem with buggy SMP BIOSes which only
1729 set the MTRRs for the boot CPU and not for the secondary CPUs. This
1730 can lead to all sorts of problems, so it's good to say Y here.
1731
1732 You can safely say Y even if your machine doesn't have MTRRs, you'll
1733 just add about 9 KB to your kernel.
1734
Randy Dunlap7225e752008-07-26 17:54:22 -07001735 See <file:Documentation/x86/mtrr.txt> for more information.
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001736
Yinghai Lu95ffa242008-04-29 03:52:33 -07001737config MTRR_SANITIZER
Yinghai Lu2ffb3502008-09-30 16:29:40 -07001738 def_bool y
Yinghai Lu95ffa242008-04-29 03:52:33 -07001739 prompt "MTRR cleanup support"
1740 depends on MTRR
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001741 ---help---
Thomas Gleixneraba37282008-07-15 14:48:48 +02001742 Convert MTRR layout from continuous to discrete, so X drivers can
1743 add writeback entries.
Yinghai Lu95ffa242008-04-29 03:52:33 -07001744
Thomas Gleixneraba37282008-07-15 14:48:48 +02001745 Can be disabled with disable_mtrr_cleanup on the kernel command line.
Matt LaPlante692105b2009-01-26 11:12:25 +01001746 The largest mtrr entry size for a continuous block can be set with
Thomas Gleixneraba37282008-07-15 14:48:48 +02001747 mtrr_chunk_size.
Yinghai Lu95ffa242008-04-29 03:52:33 -07001748
Yinghai Lu2ffb3502008-09-30 16:29:40 -07001749 If unsure, say Y.
Yinghai Lu95ffa242008-04-29 03:52:33 -07001750
1751config MTRR_SANITIZER_ENABLE_DEFAULT
Yinghai Luf5098d62008-04-29 20:25:58 -07001752 int "MTRR cleanup enable value (0-1)"
1753 range 0 1
1754 default "0"
Yinghai Lu95ffa242008-04-29 03:52:33 -07001755 depends on MTRR_SANITIZER
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001756 ---help---
Yinghai Luf5098d62008-04-29 20:25:58 -07001757 Enable mtrr cleanup default value
Yinghai Lu95ffa242008-04-29 03:52:33 -07001758
Yinghai Lu12031a62008-05-02 02:40:22 -07001759config MTRR_SANITIZER_SPARE_REG_NR_DEFAULT
1760 int "MTRR cleanup spare reg num (0-7)"
1761 range 0 7
1762 default "1"
1763 depends on MTRR_SANITIZER
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001764 ---help---
Yinghai Lu12031a62008-05-02 02:40:22 -07001765 mtrr cleanup spare entries default, it can be changed via
Thomas Gleixneraba37282008-07-15 14:48:48 +02001766 mtrr_spare_reg_nr=N on the kernel command line.
Yinghai Lu12031a62008-05-02 02:40:22 -07001767
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001768config X86_PAT
Jan Beulich6fc108a2010-04-21 15:23:44 +01001769 def_bool y
David Rientjes6a108a12011-01-20 14:44:16 -08001770 prompt "x86 PAT support" if EXPERT
Ingo Molnar2a8a2712008-04-26 10:26:52 +02001771 depends on MTRR
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001772 ---help---
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001773 Use PAT attributes to setup page level cache control.
Venki Pallipadi042b78e2008-03-24 14:22:35 -07001774
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001775 PATs are the modern equivalents of MTRRs and are much more
1776 flexible than MTRRs.
1777
1778 Say N here if you see bootup problems (boot crash, boot hang,
Venki Pallipadi042b78e2008-03-24 14:22:35 -07001779 spontaneous reboots) or a non-working video driver.
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001780
1781 If unsure, say Y.
1782
Venkatesh Pallipadi46cf98c2009-07-10 09:57:37 -07001783config ARCH_USES_PG_UNCACHED
1784 def_bool y
1785 depends on X86_PAT
1786
H. Peter Anvin628c6242011-07-31 13:59:29 -07001787config ARCH_RANDOM
1788 def_bool y
1789 prompt "x86 architectural random number generator" if EXPERT
1790 ---help---
1791 Enable the x86 architectural RDRAND instruction
1792 (Intel Bull Mountain technology) to generate random numbers.
1793 If supported, this is a high bandwidth, cryptographically
1794 secure hardware random number generator.
1795
H. Peter Anvin51ae4a22012-09-21 12:43:10 -07001796config X86_SMAP
1797 def_bool y
1798 prompt "Supervisor Mode Access Prevention" if EXPERT
1799 ---help---
1800 Supervisor Mode Access Prevention (SMAP) is a security
1801 feature in newer Intel processors. There is a small
1802 performance cost if this enabled and turned on; there is
1803 also a small increase in the kernel size if this is enabled.
1804
1805 If unsure, say Y.
1806
Ricardo Neriaa35f892017-11-05 18:27:54 -08001807config X86_INTEL_UMIP
Ricardo Neri796ebc82017-11-13 22:29:42 -08001808 def_bool y
Ricardo Neriaa35f892017-11-05 18:27:54 -08001809 depends on CPU_SUP_INTEL
1810 prompt "Intel User Mode Instruction Prevention" if EXPERT
1811 ---help---
1812 The User Mode Instruction Prevention (UMIP) is a security
1813 feature in newer Intel processors. If enabled, a general
Ricardo Neri796ebc82017-11-13 22:29:42 -08001814 protection fault is issued if the SGDT, SLDT, SIDT, SMSW
1815 or STR instructions are executed in user mode. These instructions
1816 unnecessarily expose information about the hardware state.
1817
1818 The vast majority of applications do not use these instructions.
1819 For the very few that do, software emulation is provided in
1820 specific cases in protected and virtual-8086 modes. Emulated
1821 results are dummy.
Ricardo Neriaa35f892017-11-05 18:27:54 -08001822
Dave Hansen72e9b5f2014-12-12 10:38:36 -08001823config X86_INTEL_MPX
1824 prompt "Intel MPX (Memory Protection Extensions)"
1825 def_bool n
Rik van Rieldf3735c2017-09-06 16:25:11 -07001826 # Note: only available in 64-bit mode due to VMA flags shortage
1827 depends on CPU_SUP_INTEL && X86_64
1828 select ARCH_USES_HIGH_VMA_FLAGS
Dave Hansen72e9b5f2014-12-12 10:38:36 -08001829 ---help---
1830 MPX provides hardware features that can be used in
1831 conjunction with compiler-instrumented code to check
1832 memory references. It is designed to detect buffer
1833 overflow or underflow bugs.
1834
1835 This option enables running applications which are
1836 instrumented or otherwise use MPX. It does not use MPX
1837 itself inside the kernel or to protect the kernel
1838 against bad memory references.
1839
1840 Enabling this option will make the kernel larger:
1841 ~8k of kernel text and 36 bytes of data on a 64-bit
1842 defconfig. It adds a long to the 'mm_struct' which
1843 will increase the kernel memory overhead of each
1844 process and adds some branches to paths used during
1845 exec() and munmap().
1846
1847 For details, see Documentation/x86/intel_mpx.txt
1848
1849 If unsure, say N.
1850
Dave Hansen35e97792016-02-12 13:02:00 -08001851config X86_INTEL_MEMORY_PROTECTION_KEYS
Dave Hansen284244a2016-02-12 13:02:28 -08001852 prompt "Intel Memory Protection Keys"
Dave Hansen35e97792016-02-12 13:02:00 -08001853 def_bool y
Dave Hansen284244a2016-02-12 13:02:28 -08001854 # Note: only available in 64-bit mode
Dave Hansen35e97792016-02-12 13:02:00 -08001855 depends on CPU_SUP_INTEL && X86_64
Ingo Molnar52c8e602016-11-15 10:15:03 +01001856 select ARCH_USES_HIGH_VMA_FLAGS
1857 select ARCH_HAS_PKEYS
Dave Hansen284244a2016-02-12 13:02:28 -08001858 ---help---
1859 Memory Protection Keys provides a mechanism for enforcing
1860 page-based protections, but without requiring modification of the
1861 page tables when an application changes protection domains.
1862
1863 For details, see Documentation/x86/protection-keys.txt
1864
1865 If unsure, say y.
Dave Hansen35e97792016-02-12 13:02:00 -08001866
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001867config EFI
Jan Beulich9ba16082008-10-15 22:01:38 -07001868 bool "EFI runtime service support"
Huang, Ying5b836832008-01-30 13:31:19 +01001869 depends on ACPI
Sergey Vlasovf6ce5002013-04-16 18:31:08 +04001870 select UCS2_STRING
Ard Biesheuvel022ee6c2014-06-26 12:09:05 +02001871 select EFI_RUNTIME_WRAPPERS
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001872 ---help---
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001873 This enables the kernel to use EFI runtime services that are
1874 available (such as the EFI variable services).
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001875
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001876 This option is only useful on systems that have EFI firmware.
1877 In addition, you should use the latest ELILO loader available
1878 at <http://elilo.sourceforge.net> in order to take advantage
1879 of EFI runtime services. However, even with this option, the
1880 resultant kernel should continue to boot on existing non-EFI
1881 platforms.
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001882
Matt Fleming291f3632011-12-12 21:27:52 +00001883config EFI_STUB
1884 bool "EFI stub support"
Matt Flemingb16d8c22014-08-05 00:12:19 +01001885 depends on EFI && !X86_USE_3DNOW
Matt Fleming7b2a5832014-07-11 08:45:25 +01001886 select RELOCATABLE
Matt Fleming291f3632011-12-12 21:27:52 +00001887 ---help---
1888 This kernel feature allows a bzImage to be loaded directly
1889 by EFI firmware without the use of a bootloader.
1890
Roy Franz4172fe22013-09-22 15:45:25 -07001891 See Documentation/efi-stub.txt for more information.
Matt Fleming0c759662012-03-16 12:03:13 +00001892
Matt Fleming7d453ee2014-01-10 18:52:06 +00001893config EFI_MIXED
1894 bool "EFI mixed-mode support"
1895 depends on EFI_STUB && X86_64
1896 ---help---
1897 Enabling this feature allows a 64-bit kernel to be booted
1898 on a 32-bit firmware, provided that your CPU supports 64-bit
1899 mode.
1900
1901 Note that it is not possible to boot a mixed-mode enabled
1902 kernel via the EFI boot stub - a bootloader that supports
1903 the EFI handover protocol must be used.
1904
1905 If unsure, say N.
1906
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001907config SECCOMP
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001908 def_bool y
1909 prompt "Enable seccomp to safely compute untrusted bytecode"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001910 ---help---
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001911 This kernel feature is useful for number crunching applications
1912 that may need to compute untrusted bytecode during their
1913 execution. By using pipes or other transports made available to
1914 the process as file descriptors supporting the read/write
1915 syscalls, it's possible to isolate those applications in
1916 their own address space using seccomp. Once seccomp is
Alexey Dobriyan9c0bbee2008-09-09 11:01:31 +04001917 enabled via prctl(PR_SET_SECCOMP), it cannot be disabled
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001918 and the task is only allowed to execute a few safe syscalls
1919 defined by each seccomp mode.
1920
1921 If unsure, say Y. Only embedded should say N here.
1922
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001923source kernel/Kconfig.hz
1924
1925config KEXEC
1926 bool "kexec system call"
Dave Young2965faa2015-09-09 15:38:55 -07001927 select KEXEC_CORE
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001928 ---help---
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001929 kexec is a system call that implements the ability to shutdown your
1930 current kernel, and to start another kernel. It is like a reboot
1931 but it is independent of the system firmware. And like a reboot
1932 you can start any kernel with it, not just Linux.
1933
1934 The name comes from the similarity to the exec system call.
1935
1936 It is an ongoing process to be certain the hardware in a machine
1937 is properly shutdown, so do not be surprised if this code does not
Geert Uytterhoevenbf220692013-08-20 21:38:03 +02001938 initially work for you. As of this writing the exact hardware
1939 interface is strongly in flux, so no good recommendation can be
1940 made.
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001941
Vivek Goyal74ca3172014-08-29 15:18:46 -07001942config KEXEC_FILE
1943 bool "kexec file based system call"
Dave Young2965faa2015-09-09 15:38:55 -07001944 select KEXEC_CORE
Vivek Goyal74ca3172014-08-29 15:18:46 -07001945 select BUILD_BIN2C
Vivek Goyal74ca3172014-08-29 15:18:46 -07001946 depends on X86_64
1947 depends on CRYPTO=y
1948 depends on CRYPTO_SHA256=y
1949 ---help---
1950 This is new version of kexec system call. This system call is
1951 file based and takes file descriptors as system call argument
1952 for kernel and initramfs as opposed to list of segments as
1953 accepted by previous system call.
1954
Vivek Goyal8e7d8382014-08-08 14:26:13 -07001955config KEXEC_VERIFY_SIG
1956 bool "Verify kernel signature during kexec_file_load() syscall"
Vivek Goyal74ca3172014-08-29 15:18:46 -07001957 depends on KEXEC_FILE
Vivek Goyal8e7d8382014-08-08 14:26:13 -07001958 ---help---
1959 This option makes kernel signature verification mandatory for
Borislav Petkovd8eb8942015-03-13 14:04:37 +01001960 the kexec_file_load() syscall.
Vivek Goyal8e7d8382014-08-08 14:26:13 -07001961
Borislav Petkovd8eb8942015-03-13 14:04:37 +01001962 In addition to that option, you need to enable signature
1963 verification for the corresponding kernel image type being
1964 loaded in order for this to work.
Vivek Goyal8e7d8382014-08-08 14:26:13 -07001965
1966config KEXEC_BZIMAGE_VERIFY_SIG
1967 bool "Enable bzImage signature verification support"
1968 depends on KEXEC_VERIFY_SIG
1969 depends on SIGNED_PE_FILE_VERIFICATION
1970 select SYSTEM_TRUSTED_KEYRING
1971 ---help---
1972 Enable bzImage signature verification support.
1973
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001974config CRASH_DUMP
Pavel Machek04b69442008-08-14 17:16:50 +02001975 bool "kernel crash dumps"
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001976 depends on X86_64 || (X86_32 && HIGHMEM)
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001977 ---help---
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001978 Generate crash dump after being started by kexec.
1979 This should be normally only set in special crash dump kernels
1980 which are loaded in the main kernel with kexec-tools into
1981 a specially reserved region and then later executed after
1982 a crash by kdump/kexec. The crash dump kernel must be compiled
1983 to a memory address not used by the main kernel or BIOS using
1984 PHYSICAL_START, or it must be built as a relocatable image
1985 (CONFIG_RELOCATABLE=y).
1986 For more details see Documentation/kdump/kdump.txt
1987
Huang Ying3ab83522008-07-25 19:45:07 -07001988config KEXEC_JUMP
Kees Cook6ea30382012-10-02 11:16:47 -07001989 bool "kexec jump"
Huang Yingfee7b0d2009-03-10 10:57:16 +08001990 depends on KEXEC && HIBERNATION
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001991 ---help---
Huang Ying89081d12008-07-25 19:45:10 -07001992 Jump between original kernel and kexeced kernel and invoke
1993 code in physical address mode via KEXEC
Huang Ying3ab83522008-07-25 19:45:07 -07001994
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001995config PHYSICAL_START
David Rientjes6a108a12011-01-20 14:44:16 -08001996 hex "Physical address where the kernel is loaded" if (EXPERT || CRASH_DUMP)
H. Peter Anvinceefccc2009-05-11 16:12:16 -07001997 default "0x1000000"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001998 ---help---
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001999 This gives the physical address where the kernel is loaded.
2000
2001 If kernel is a not relocatable (CONFIG_RELOCATABLE=n) then
2002 bzImage will decompress itself to above physical address and
2003 run from there. Otherwise, bzImage will run from the address where
2004 it has been loaded by the boot loader and will ignore above physical
2005 address.
2006
2007 In normal kdump cases one does not have to set/change this option
2008 as now bzImage can be compiled as a completely relocatable image
2009 (CONFIG_RELOCATABLE=y) and be used to load and run from a different
2010 address. This option is mainly useful for the folks who don't want
2011 to use a bzImage for capturing the crash dump and want to use a
2012 vmlinux instead. vmlinux is not relocatable hence a kernel needs
2013 to be specifically compiled to run from a specific memory area
2014 (normally a reserved region) and this option comes handy.
2015
H. Peter Anvinceefccc2009-05-11 16:12:16 -07002016 So if you are using bzImage for capturing the crash dump,
2017 leave the value here unchanged to 0x1000000 and set
2018 CONFIG_RELOCATABLE=y. Otherwise if you plan to use vmlinux
2019 for capturing the crash dump change this value to start of
2020 the reserved region. In other words, it can be set based on
2021 the "X" value as specified in the "crashkernel=YM@XM"
2022 command line boot parameter passed to the panic-ed
2023 kernel. Please take a look at Documentation/kdump/kdump.txt
2024 for more details about crash dumps.
Sam Ravnborg506f1d072007-11-09 21:56:54 +01002025
2026 Usage of bzImage for capturing the crash dump is recommended as
2027 one does not have to build two kernels. Same kernel can be used
2028 as production kernel and capture kernel. Above option should have
2029 gone away after relocatable bzImage support is introduced. But it
2030 is present because there are users out there who continue to use
2031 vmlinux for dump capture. This option should go away down the
2032 line.
2033
2034 Don't change this unless you know what you are doing.
2035
2036config RELOCATABLE
H. Peter Anvin26717802009-05-07 14:19:34 -07002037 bool "Build a relocatable kernel"
2038 default y
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002039 ---help---
Sam Ravnborg506f1d072007-11-09 21:56:54 +01002040 This builds a kernel image that retains relocation information
2041 so it can be loaded someplace besides the default 1MB.
2042 The relocations tend to make the kernel binary about 10% larger,
2043 but are discarded at runtime.
2044
2045 One use is for the kexec on panic case where the recovery kernel
2046 must live at a different physical address than the primary
2047 kernel.
2048
2049 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
2050 it has been loaded at and the compile time physical address
Kees Cook8ab38202013-10-10 17:18:14 -07002051 (CONFIG_PHYSICAL_START) is used as the minimum location.
Sam Ravnborg506f1d072007-11-09 21:56:54 +01002052
Kees Cook8ab38202013-10-10 17:18:14 -07002053config RANDOMIZE_BASE
Baoquan Hee8581e32016-04-20 13:55:43 -07002054 bool "Randomize the address of the kernel image (KASLR)"
Kees Cook8ab38202013-10-10 17:18:14 -07002055 depends on RELOCATABLE
Ingo Molnar6807c842017-04-18 11:08:12 +02002056 default y
Kees Cook8ab38202013-10-10 17:18:14 -07002057 ---help---
Baoquan Hee8581e32016-04-20 13:55:43 -07002058 In support of Kernel Address Space Layout Randomization (KASLR),
2059 this randomizes the physical address at which the kernel image
2060 is decompressed and the virtual address where the kernel
2061 image is mapped, as a security feature that deters exploit
2062 attempts relying on knowledge of the location of kernel
2063 code internals.
Kees Cook8ab38202013-10-10 17:18:14 -07002064
Kees Cooked9f0072016-05-25 15:45:33 -07002065 On 64-bit, the kernel physical and virtual addresses are
2066 randomized separately. The physical address will be anywhere
2067 between 16MB and the top of physical memory (up to 64TB). The
2068 virtual address will be randomized from 16MB up to 1GB (9 bits
2069 of entropy). Note that this also reduces the memory space
2070 available to kernel modules from 1.5GB to 1GB.
2071
2072 On 32-bit, the kernel physical and virtual addresses are
2073 randomized together. They will be randomized from 16MB up to
2074 512MB (8 bits of entropy).
Kees Cook8ab38202013-10-10 17:18:14 -07002075
Baoquan Hee8581e32016-04-20 13:55:43 -07002076 Entropy is generated using the RDRAND instruction if it is
2077 supported. If RDTSC is supported, its value is mixed into
2078 the entropy pool as well. If neither RDRAND nor RDTSC are
Kees Cooked9f0072016-05-25 15:45:33 -07002079 supported, then entropy is read from the i8254 timer. The
2080 usable entropy is limited by the kernel being built using
2081 2GB addressing, and that PHYSICAL_ALIGN must be at a
2082 minimum of 2MB. As a result, only 10 bits of entropy are
2083 theoretically possible, but the implementations are further
2084 limited due to memory layouts.
Kees Cookda2b6fb2013-12-10 12:27:45 -08002085
Ingo Molnar6807c842017-04-18 11:08:12 +02002086 If unsure, say Y.
Kees Cook8ab38202013-10-10 17:18:14 -07002087
2088# Relocation on x86 needs some additional build support
H. Peter Anvin845adf72009-05-05 21:20:51 -07002089config X86_NEED_RELOCS
2090 def_bool y
Kees Cook8ab38202013-10-10 17:18:14 -07002091 depends on RANDOMIZE_BASE || (X86_32 && RELOCATABLE)
H. Peter Anvin845adf72009-05-05 21:20:51 -07002092
Sam Ravnborg506f1d072007-11-09 21:56:54 +01002093config PHYSICAL_ALIGN
Kees Cooka0215062013-07-08 09:15:17 -07002094 hex "Alignment value to which kernel should be aligned"
Kees Cook8ab38202013-10-10 17:18:14 -07002095 default "0x200000"
Kees Cooka0215062013-07-08 09:15:17 -07002096 range 0x2000 0x1000000 if X86_32
2097 range 0x200000 0x1000000 if X86_64
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002098 ---help---
Sam Ravnborg506f1d072007-11-09 21:56:54 +01002099 This value puts the alignment restrictions on physical address
2100 where kernel is loaded and run from. Kernel is compiled for an
2101 address which meets above alignment restriction.
2102
2103 If bootloader loads the kernel at a non-aligned address and
2104 CONFIG_RELOCATABLE is set, kernel will move itself to nearest
2105 address aligned to above value and run from there.
2106
2107 If bootloader loads the kernel at a non-aligned address and
2108 CONFIG_RELOCATABLE is not set, kernel will ignore the run time
2109 load address and decompress itself to the address it has been
2110 compiled for and run from there. The address for which kernel is
2111 compiled already meets above alignment restrictions. Hence the
2112 end result is that kernel runs from a physical address meeting
2113 above alignment restrictions.
2114
Kees Cooka0215062013-07-08 09:15:17 -07002115 On 32-bit this value must be a multiple of 0x2000. On 64-bit
2116 this value must be a multiple of 0x200000.
2117
Sam Ravnborg506f1d072007-11-09 21:56:54 +01002118 Don't change this unless you know what you are doing.
2119
Thomas Garnier0483e1f2016-06-21 17:47:02 -07002120config RANDOMIZE_MEMORY
2121 bool "Randomize the kernel memory sections"
2122 depends on X86_64
2123 depends on RANDOMIZE_BASE
2124 default RANDOMIZE_BASE
2125 ---help---
2126 Randomizes the base virtual address of kernel memory sections
2127 (physical memory mapping, vmalloc & vmemmap). This security feature
2128 makes exploits relying on predictable memory locations less reliable.
2129
2130 The order of allocations remains unchanged. Entropy is generated in
2131 the same way as RANDOMIZE_BASE. Current implementation in the optimal
2132 configuration have in average 30,000 different possible virtual
2133 addresses for each memory section.
2134
Ingo Molnar6807c842017-04-18 11:08:12 +02002135 If unsure, say Y.
Thomas Garnier0483e1f2016-06-21 17:47:02 -07002136
Thomas Garnier90397a42016-06-21 17:47:06 -07002137config RANDOMIZE_MEMORY_PHYSICAL_PADDING
2138 hex "Physical memory mapping padding" if EXPERT
2139 depends on RANDOMIZE_MEMORY
2140 default "0xa" if MEMORY_HOTPLUG
2141 default "0x0"
2142 range 0x1 0x40 if MEMORY_HOTPLUG
2143 range 0x0 0x40
2144 ---help---
2145 Define the padding in terabytes added to the existing physical
2146 memory size during kernel memory randomization. It is useful
2147 for memory hotplug support but reduces the entropy available for
2148 address randomization.
2149
2150 If unsure, leave at the default value.
2151
Sam Ravnborg506f1d072007-11-09 21:56:54 +01002152config HOTPLUG_CPU
Dimitri Sivanich7c13e6a2008-08-11 10:46:46 -05002153 bool "Support for hot-pluggable CPUs"
Stephen Rothwell40b31362013-05-21 13:49:35 +10002154 depends on SMP
Sam Ravnborg506f1d072007-11-09 21:56:54 +01002155 ---help---
Dimitri Sivanich7c13e6a2008-08-11 10:46:46 -05002156 Say Y here to allow turning CPUs off and on. CPUs can be
2157 controlled through /sys/devices/system/cpu.
2158 ( Note: power management support will enable this option
2159 automatically on SMP systems. )
2160 Say N if you want to disable CPU hotplug.
Sam Ravnborg506f1d072007-11-09 21:56:54 +01002161
Fenghua Yu80aa1df2012-11-13 11:32:39 -08002162config BOOTPARAM_HOTPLUG_CPU0
2163 bool "Set default setting of cpu0_hotpluggable"
2164 default n
Kees Cook2c922cd2013-01-22 13:01:19 -08002165 depends on HOTPLUG_CPU
Fenghua Yu80aa1df2012-11-13 11:32:39 -08002166 ---help---
2167 Set whether default state of cpu0_hotpluggable is on or off.
2168
2169 Say Y here to enable CPU0 hotplug by default. If this switch
2170 is turned on, there is no need to give cpu0_hotplug kernel
2171 parameter and the CPU0 hotplug feature is enabled by default.
2172
2173 Please note: there are two known CPU0 dependencies if you want
2174 to enable the CPU0 hotplug feature either by this switch or by
2175 cpu0_hotplug kernel parameter.
2176
2177 First, resume from hibernate or suspend always starts from CPU0.
2178 So hibernate and suspend are prevented if CPU0 is offline.
2179
2180 Second dependency is PIC interrupts always go to CPU0. CPU0 can not
2181 offline if any interrupt can not migrate out of CPU0. There may
2182 be other CPU0 dependencies.
2183
2184 Please make sure the dependencies are under your control before
2185 you enable this feature.
2186
2187 Say N if you don't want to enable CPU0 hotplug feature by default.
2188 You still can enable the CPU0 hotplug feature at boot by kernel
2189 parameter cpu0_hotplug.
2190
Fenghua Yua71c8bc2012-11-13 11:32:51 -08002191config DEBUG_HOTPLUG_CPU0
2192 def_bool n
2193 prompt "Debug CPU0 hotplug"
Kees Cook2c922cd2013-01-22 13:01:19 -08002194 depends on HOTPLUG_CPU
Fenghua Yua71c8bc2012-11-13 11:32:51 -08002195 ---help---
2196 Enabling this option offlines CPU0 (if CPU0 can be offlined) as
2197 soon as possible and boots up userspace with CPU0 offlined. User
2198 can online CPU0 back after boot time.
2199
2200 To debug CPU0 hotplug, you need to enable CPU0 offline/online
2201 feature by either turning on CONFIG_BOOTPARAM_HOTPLUG_CPU0 during
2202 compilation or giving cpu0_hotplug kernel parameter at boot.
2203
2204 If unsure, say N.
2205
Sam Ravnborg506f1d072007-11-09 21:56:54 +01002206config COMPAT_VDSO
Andy Lutomirskib0b49f22014-03-13 16:01:26 -07002207 def_bool n
2208 prompt "Disable the 32-bit vDSO (needed for glibc 2.3.3)"
Ingo Molnar953fee12016-11-15 10:22:52 +01002209 depends on COMPAT_32
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002210 ---help---
Andy Lutomirskib0b49f22014-03-13 16:01:26 -07002211 Certain buggy versions of glibc will crash if they are
2212 presented with a 32-bit vDSO that is not mapped at the address
2213 indicated in its segment table.
Randy Dunlape84446d2009-11-10 15:46:52 -08002214
Andy Lutomirskib0b49f22014-03-13 16:01:26 -07002215 The bug was introduced by f866314b89d56845f55e6f365e18b31ec978ec3a
2216 and fixed by 3b3ddb4f7db98ec9e912ccdf54d35df4aa30e04a and
2217 49ad572a70b8aeb91e57483a11dd1b77e31c4468. Glibc 2.3.3 is
2218 the only released version with the bug, but OpenSUSE 9
2219 contains a buggy "glibc 2.3.2".
Sam Ravnborg506f1d072007-11-09 21:56:54 +01002220
Andy Lutomirskib0b49f22014-03-13 16:01:26 -07002221 The symptom of the bug is that everything crashes on startup, saying:
2222 dl_main: Assertion `(void *) ph->p_vaddr == _rtld_local._dl_sysinfo_dso' failed!
2223
2224 Saying Y here changes the default value of the vdso32 boot
2225 option from 1 to 0, which turns off the 32-bit vDSO entirely.
2226 This works around the glibc bug but hurts performance.
2227
2228 If unsure, say N: if you are compiling your own kernel, you
2229 are unlikely to be using a buggy version of glibc.
Sam Ravnborg506f1d072007-11-09 21:56:54 +01002230
Kees Cook3dc33bd2015-08-12 17:55:19 -07002231choice
2232 prompt "vsyscall table for legacy applications"
2233 depends on X86_64
2234 default LEGACY_VSYSCALL_EMULATE
2235 help
2236 Legacy user code that does not know how to find the vDSO expects
2237 to be able to issue three syscalls by calling fixed addresses in
2238 kernel space. Since this location is not randomized with ASLR,
2239 it can be used to assist security vulnerability exploitation.
2240
2241 This setting can be changed at boot time via the kernel command
2242 line parameter vsyscall=[native|emulate|none].
2243
2244 On a system with recent enough glibc (2.14 or newer) and no
2245 static binaries, you can say None without a performance penalty
2246 to improve security.
2247
2248 If unsure, select "Emulate".
2249
2250 config LEGACY_VSYSCALL_NATIVE
2251 bool "Native"
2252 help
2253 Actual executable code is located in the fixed vsyscall
2254 address mapping, implementing time() efficiently. Since
2255 this makes the mapping executable, it can be used during
2256 security vulnerability exploitation (traditionally as
2257 ROP gadgets). This configuration is not recommended.
2258
2259 config LEGACY_VSYSCALL_EMULATE
2260 bool "Emulate"
2261 help
2262 The kernel traps and emulates calls into the fixed
2263 vsyscall address mapping. This makes the mapping
2264 non-executable, but it still contains known contents,
2265 which could be used in certain rare security vulnerability
2266 exploits. This configuration is recommended when userspace
2267 still uses the vsyscall area.
2268
2269 config LEGACY_VSYSCALL_NONE
2270 bool "None"
2271 help
2272 There will be no vsyscall mapping at all. This will
2273 eliminate any risk of ASLR bypass due to the vsyscall
2274 fixed address mapping. Attempts to use the vsyscalls
2275 will be reported to dmesg, so that either old or
2276 malicious userspace programs can be identified.
2277
2278endchoice
2279
Tim Bird516cbf32008-08-12 12:52:36 -07002280config CMDLINE_BOOL
2281 bool "Built-in kernel command line"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002282 ---help---
Tim Bird516cbf32008-08-12 12:52:36 -07002283 Allow for specifying boot arguments to the kernel at
2284 build time. On some systems (e.g. embedded ones), it is
2285 necessary or convenient to provide some or all of the
2286 kernel boot arguments with the kernel itself (that is,
2287 to not rely on the boot loader to provide them.)
2288
2289 To compile command line arguments into the kernel,
2290 set this option to 'Y', then fill in the
Sébastien Hinderer69711ca2015-07-08 00:02:01 +02002291 boot arguments in CONFIG_CMDLINE.
Tim Bird516cbf32008-08-12 12:52:36 -07002292
2293 Systems with fully functional boot loaders (i.e. non-embedded)
2294 should leave this option set to 'N'.
2295
2296config CMDLINE
2297 string "Built-in kernel command string"
2298 depends on CMDLINE_BOOL
2299 default ""
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002300 ---help---
Tim Bird516cbf32008-08-12 12:52:36 -07002301 Enter arguments here that should be compiled into the kernel
2302 image and used at boot time. If the boot loader provides a
2303 command line at boot time, it is appended to this string to
2304 form the full kernel command line, when the system boots.
2305
2306 However, you can use the CONFIG_CMDLINE_OVERRIDE option to
2307 change this behavior.
2308
2309 In most cases, the command line (whether built-in or provided
2310 by the boot loader) should specify the device for the root
2311 file system.
2312
2313config CMDLINE_OVERRIDE
2314 bool "Built-in command line overrides boot loader arguments"
Tim Bird516cbf32008-08-12 12:52:36 -07002315 depends on CMDLINE_BOOL
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002316 ---help---
Tim Bird516cbf32008-08-12 12:52:36 -07002317 Set this option to 'Y' to have the kernel ignore the boot loader
2318 command line, and use ONLY the built-in command line.
2319
2320 This is used to work around broken boot loaders. This should
2321 be set to 'N' under normal conditions.
2322
Andy Lutomirskia5b9e5a2015-07-30 14:31:34 -07002323config MODIFY_LDT_SYSCALL
2324 bool "Enable the LDT (local descriptor table)" if EXPERT
2325 default y
2326 ---help---
2327 Linux can allow user programs to install a per-process x86
2328 Local Descriptor Table (LDT) using the modify_ldt(2) system
2329 call. This is required to run 16-bit or segmented code such as
2330 DOSEMU or some Wine programs. It is also used by some very old
2331 threading libraries.
2332
2333 Enabling this feature adds a small amount of overhead to
2334 context switches and increases the low-level kernel attack
2335 surface. Disabling it removes the modify_ldt(2) system call.
2336
2337 Saying 'N' here may make sense for embedded or server kernels.
2338
Seth Jenningsb700e7f2014-12-16 11:58:19 -06002339source "kernel/livepatch/Kconfig"
2340
Sam Ravnborg506f1d072007-11-09 21:56:54 +01002341endmenu
2342
Michal Hocko3072e412017-09-08 16:11:39 -07002343config ARCH_HAS_ADD_PAGES
2344 def_bool y
2345 depends on X86_64 && ARCH_ENABLE_MEMORY_HOTPLUG
2346
Sam Ravnborg506f1d072007-11-09 21:56:54 +01002347config ARCH_ENABLE_MEMORY_HOTPLUG
2348 def_bool y
2349 depends on X86_64 || (X86_32 && HIGHMEM)
2350
Gary Hade35551052008-10-31 10:52:03 -07002351config ARCH_ENABLE_MEMORY_HOTREMOVE
2352 def_bool y
2353 depends on MEMORY_HOTPLUG
2354
Lee Schermerhorne534c7c2010-05-26 14:44:58 -07002355config USE_PERCPU_NUMA_NODE_ID
Tejun Heo645a7912011-01-23 14:37:40 +01002356 def_bool y
Lee Schermerhorne534c7c2010-05-26 14:44:58 -07002357 depends on NUMA
2358
Kirill A. Shutemov94918462013-11-14 14:31:10 -08002359config ARCH_ENABLE_SPLIT_PMD_PTLOCK
2360 def_bool y
2361 depends on X86_64 || X86_PAE
2362
Naoya Horiguchic177c812014-06-04 16:05:35 -07002363config ARCH_ENABLE_HUGEPAGE_MIGRATION
2364 def_bool y
2365 depends on X86_64 && HUGETLB_PAGE && MIGRATION
2366
Naoya Horiguchi9c670ea2017-09-08 16:10:53 -07002367config ARCH_ENABLE_THP_MIGRATION
2368 def_bool y
2369 depends on X86_64 && TRANSPARENT_HUGEPAGE
2370
Bjorn Helgaasda85f862008-11-05 13:37:27 -06002371menu "Power management and ACPI options"
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002372
2373config ARCH_HIBERNATION_HEADER
Harvey Harrison3c2362e2008-01-30 13:31:03 +01002374 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002375 depends on X86_64 && HIBERNATION
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002376
2377source "kernel/power/Kconfig"
2378
2379source "drivers/acpi/Kconfig"
2380
Feng Tangefafc8b2009-08-14 15:23:29 -04002381source "drivers/sfi/Kconfig"
2382
Andi Kleena6b68072008-01-30 13:32:49 +01002383config X86_APM_BOOT
Jan Beulich6fc108a2010-04-21 15:23:44 +01002384 def_bool y
Paul Bolle282e5aa2011-11-17 11:41:31 +01002385 depends on APM
Andi Kleena6b68072008-01-30 13:32:49 +01002386
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002387menuconfig APM
2388 tristate "APM (Advanced Power Management) BIOS support"
Ingo Molnarefefa6f2008-07-10 16:09:50 +02002389 depends on X86_32 && PM_SLEEP
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002390 ---help---
2391 APM is a BIOS specification for saving power using several different
2392 techniques. This is mostly useful for battery powered laptops with
2393 APM compliant BIOSes. If you say Y here, the system time will be
2394 reset after a RESUME operation, the /proc/apm device will provide
2395 battery status information, and user-space programs will receive
2396 notification of APM "events" (e.g. battery status change).
2397
2398 If you select "Y" here, you can disable actual use of the APM
2399 BIOS by passing the "apm=off" option to the kernel at boot time.
2400
2401 Note that the APM support is almost completely disabled for
2402 machines with more than one CPU.
2403
2404 In order to use APM, you will need supporting software. For location
Michael Witten2dc98fd2011-07-08 21:11:16 +00002405 and more information, read <file:Documentation/power/apm-acpi.txt>
2406 and the Battery Powered Linux mini-HOWTO, available from
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002407 <http://www.tldp.org/docs.html#howto>.
2408
2409 This driver does not spin down disk drives (see the hdparm(8)
2410 manpage ("man 8 hdparm") for that), and it doesn't turn off
2411 VESA-compliant "green" monitors.
2412
2413 This driver does not support the TI 4000M TravelMate and the ACER
2414 486/DX4/75 because they don't have compliant BIOSes. Many "green"
2415 desktop machines also don't have compliant BIOSes, and this driver
2416 may cause those machines to panic during the boot phase.
2417
2418 Generally, if you don't have a battery in your machine, there isn't
2419 much point in using this driver and you should say N. If you get
2420 random kernel OOPSes or reboots that don't seem to be related to
2421 anything, try disabling/enabling this option (or disabling/enabling
2422 APM in your BIOS).
2423
2424 Some other things you should try when experiencing seemingly random,
2425 "weird" problems:
2426
2427 1) make sure that you have enough swap space and that it is
2428 enabled.
2429 2) pass the "no-hlt" option to the kernel
2430 3) switch on floating point emulation in the kernel and pass
2431 the "no387" option to the kernel
2432 4) pass the "floppy=nodma" option to the kernel
2433 5) pass the "mem=4M" option to the kernel (thereby disabling
2434 all but the first 4 MB of RAM)
2435 6) make sure that the CPU is not over clocked.
2436 7) read the sig11 FAQ at <http://www.bitwizard.nl/sig11/>
2437 8) disable the cache from your BIOS settings
2438 9) install a fan for the video card or exchange video RAM
2439 10) install a better fan for the CPU
2440 11) exchange RAM chips
2441 12) exchange the motherboard.
2442
2443 To compile this driver as a module, choose M here: the
2444 module will be called apm.
2445
2446if APM
2447
2448config APM_IGNORE_USER_SUSPEND
2449 bool "Ignore USER SUSPEND"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002450 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002451 This option will ignore USER SUSPEND requests. On machines with a
2452 compliant APM BIOS, you want to say N. However, on the NEC Versa M
2453 series notebooks, it is necessary to say Y because of a BIOS bug.
2454
2455config APM_DO_ENABLE
2456 bool "Enable PM at boot time"
2457 ---help---
2458 Enable APM features at boot time. From page 36 of the APM BIOS
2459 specification: "When disabled, the APM BIOS does not automatically
2460 power manage devices, enter the Standby State, enter the Suspend
2461 State, or take power saving steps in response to CPU Idle calls."
2462 This driver will make CPU Idle calls when Linux is idle (unless this
2463 feature is turned off -- see "Do CPU IDLE calls", below). This
2464 should always save battery power, but more complicated APM features
2465 will be dependent on your BIOS implementation. You may need to turn
2466 this option off if your computer hangs at boot time when using APM
2467 support, or if it beeps continuously instead of suspending. Turn
2468 this off if you have a NEC UltraLite Versa 33/C or a Toshiba
2469 T400CDT. This is off by default since most machines do fine without
2470 this feature.
2471
2472config APM_CPU_IDLE
Len Browndd8af072013-02-09 21:10:04 -05002473 depends on CPU_IDLE
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002474 bool "Make CPU Idle calls when idle"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002475 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002476 Enable calls to APM CPU Idle/CPU Busy inside the kernel's idle loop.
2477 On some machines, this can activate improved power savings, such as
2478 a slowed CPU clock rate, when the machine is idle. These idle calls
2479 are made after the idle loop has run for some length of time (e.g.,
2480 333 mS). On some machines, this will cause a hang at boot time or
2481 whenever the CPU becomes idle. (On machines with more than one CPU,
2482 this option does nothing.)
2483
2484config APM_DISPLAY_BLANK
2485 bool "Enable console blanking using APM"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002486 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002487 Enable console blanking using the APM. Some laptops can use this to
2488 turn off the LCD backlight when the screen blanker of the Linux
2489 virtual console blanks the screen. Note that this is only used by
2490 the virtual console screen blanker, and won't turn off the backlight
2491 when using the X Window system. This also doesn't have anything to
2492 do with your VESA-compliant power-saving monitor. Further, this
2493 option doesn't work for all laptops -- it might not turn off your
2494 backlight at all, or it might print a lot of errors to the console,
2495 especially if you are using gpm.
2496
2497config APM_ALLOW_INTS
2498 bool "Allow interrupts during APM BIOS calls"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002499 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002500 Normally we disable external interrupts while we are making calls to
2501 the APM BIOS as a measure to lessen the effects of a badly behaving
2502 BIOS implementation. The BIOS should reenable interrupts if it
2503 needs to. Unfortunately, some BIOSes do not -- especially those in
2504 many of the newer IBM Thinkpads. If you experience hangs when you
2505 suspend, try setting this to Y. Otherwise, say N.
2506
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002507endif # APM
2508
Dave Jonesbb0a56e2011-05-19 18:51:07 -04002509source "drivers/cpufreq/Kconfig"
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002510
2511source "drivers/cpuidle/Kconfig"
2512
Andy Henroid27471fd2008-10-09 11:45:22 -07002513source "drivers/idle/Kconfig"
2514
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002515endmenu
2516
2517
2518menu "Bus options (PCI etc.)"
2519
2520config PCI
Ingo Molnar1ac97012008-05-19 14:10:14 +02002521 bool "PCI support"
Adrian Bunk1c858082008-01-30 13:32:32 +01002522 default y
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002523 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002524 Find out whether you have a PCI motherboard. PCI is the name of a
2525 bus system, i.e. the way the CPU talks to the other stuff inside
2526 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
2527 VESA. If you have PCI, say Y, otherwise N.
2528
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002529choice
2530 prompt "PCI access mode"
Ingo Molnarefefa6f2008-07-10 16:09:50 +02002531 depends on X86_32 && PCI
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002532 default PCI_GOANY
2533 ---help---
2534 On PCI systems, the BIOS can be used to detect the PCI devices and
2535 determine their configuration. However, some old PCI motherboards
2536 have BIOS bugs and may crash if this is done. Also, some embedded
2537 PCI-based systems don't have any BIOS at all. Linux can also try to
2538 detect the PCI hardware directly without using the BIOS.
2539
2540 With this option, you can specify how Linux should detect the
2541 PCI devices. If you choose "BIOS", the BIOS will be used,
2542 if you choose "Direct", the BIOS won't be used, and if you
2543 choose "MMConfig", then PCI Express MMCONFIG will be used.
2544 If you choose "Any", the kernel will try MMCONFIG, then the
2545 direct access method and falls back to the BIOS if that doesn't
2546 work. If unsure, go with the default, which is "Any".
2547
2548config PCI_GOBIOS
2549 bool "BIOS"
2550
2551config PCI_GOMMCONFIG
2552 bool "MMConfig"
2553
2554config PCI_GODIRECT
2555 bool "Direct"
2556
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07002557config PCI_GOOLPC
Daniel Drake76fb6572010-09-23 17:28:04 +01002558 bool "OLPC XO-1"
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07002559 depends on OLPC
2560
Andres Salomon2bdd1b02008-06-05 14:14:41 -07002561config PCI_GOANY
2562 bool "Any"
2563
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002564endchoice
2565
2566config PCI_BIOS
Harvey Harrison3c2362e2008-01-30 13:31:03 +01002567 def_bool y
Ingo Molnarefefa6f2008-07-10 16:09:50 +02002568 depends on X86_32 && PCI && (PCI_GOBIOS || PCI_GOANY)
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002569
2570# x86-64 doesn't support PCI BIOS access from long mode so always go direct.
2571config PCI_DIRECT
Harvey Harrison3c2362e2008-01-30 13:31:03 +01002572 def_bool y
Shaohua Li0aba4962011-05-27 14:59:39 +08002573 depends on PCI && (X86_64 || (PCI_GODIRECT || PCI_GOANY || PCI_GOOLPC || PCI_GOMMCONFIG))
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002574
2575config PCI_MMCONFIG
Harvey Harrison3c2362e2008-01-30 13:31:03 +01002576 def_bool y
Feng Tang5f0db7a2009-08-14 15:37:50 -04002577 depends on X86_32 && PCI && (ACPI || SFI) && (PCI_GOMMCONFIG || PCI_GOANY)
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002578
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07002579config PCI_OLPC
Andres Salomon2bdd1b02008-06-05 14:14:41 -07002580 def_bool y
2581 depends on PCI && OLPC && (PCI_GOOLPC || PCI_GOANY)
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07002582
Alex Nixonb5401a92010-03-18 16:31:34 -04002583config PCI_XEN
2584 def_bool y
2585 depends on PCI && XEN
2586 select SWIOTLB_XEN
2587
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002588config PCI_DOMAINS
Harvey Harrison3c2362e2008-01-30 13:31:03 +01002589 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002590 depends on PCI
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002591
2592config PCI_MMCONFIG
2593 bool "Support mmconfig PCI config space access"
2594 depends on X86_64 && PCI && ACPI
2595
Ira W. Snyder3f6ea842010-04-01 11:43:30 -07002596config PCI_CNB20LE_QUIRK
David Rientjes6a108a12011-01-20 14:44:16 -08002597 bool "Read CNB20LE Host Bridge Windows" if EXPERT
Kees Cook6ea30382012-10-02 11:16:47 -07002598 depends on PCI
Ira W. Snyder3f6ea842010-04-01 11:43:30 -07002599 help
2600 Read the PCI windows out of the CNB20LE host bridge. This allows
2601 PCI hotplug to work on systems with the CNB20LE chipset which do
2602 not have ACPI.
2603
Bjorn Helgaas64a5fed2011-01-06 10:12:30 -07002604 There's no public spec for this chipset, and this functionality
2605 is known to be incomplete.
2606
2607 You should say N unless you know you need this.
2608
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002609source "drivers/pci/Kconfig"
2610
William Breathitt Gray3a495512016-05-27 18:08:27 -04002611config ISA_BUS
2612 bool "ISA-style bus support on modern systems" if EXPERT
2613 select ISA_BUS_API
2614 help
2615 Enables ISA-style drivers on modern systems. This is necessary to
2616 support PC/104 devices on X86_64 platforms.
2617
2618 If unsure, say N.
2619
David Rientjes1c00f012011-03-22 16:34:59 -07002620# x86_64 have no ISA slots, but can have ISA-style DMA.
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002621config ISA_DMA_API
David Rientjes1c00f012011-03-22 16:34:59 -07002622 bool "ISA-style DMA support" if (X86_64 && EXPERT)
2623 default y
2624 help
2625 Enables ISA-style DMA support for devices requiring such controllers.
2626 If unsure, say Y.
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002627
Linus Torvalds51e68d02016-05-21 10:25:19 -07002628if X86_32
2629
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002630config ISA
2631 bool "ISA support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002632 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002633 Find out whether you have ISA slots on your motherboard. ISA is the
2634 name of a bus system, i.e. the way the CPU talks to the other stuff
2635 inside your box. Other bus systems are PCI, EISA, MicroChannel
2636 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
2637 newer boards don't support it. If you have ISA, say Y, otherwise N.
2638
2639config EISA
2640 bool "EISA support"
2641 depends on ISA
2642 ---help---
2643 The Extended Industry Standard Architecture (EISA) bus was
2644 developed as an open alternative to the IBM MicroChannel bus.
2645
2646 The EISA bus provided some of the features of the IBM MicroChannel
2647 bus while maintaining backward compatibility with cards made for
2648 the older ISA bus. The EISA bus saw limited use between 1988 and
2649 1995 when it was made obsolete by the PCI bus.
2650
2651 Say Y here if you are building a kernel for an EISA-based machine.
2652
2653 Otherwise, say N.
2654
2655source "drivers/eisa/Kconfig"
2656
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002657config SCx200
2658 tristate "NatSemi SCx200 support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002659 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002660 This provides basic support for National Semiconductor's
2661 (now AMD's) Geode processors. The driver probes for the
2662 PCI-IDs of several on-chip devices, so its a good dependency
2663 for other scx200_* drivers.
2664
2665 If compiled as a module, the driver is named scx200.
2666
2667config SCx200HR_TIMER
2668 tristate "NatSemi SCx200 27MHz High-Resolution Timer Support"
John Stultz592913e2010-07-13 17:56:20 -07002669 depends on SCx200
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002670 default y
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002671 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002672 This driver provides a clocksource built upon the on-chip
2673 27MHz high-resolution timer. Its also a workaround for
2674 NSC Geode SC-1100's buggy TSC, which loses time when the
2675 processor goes idle (as is done by the scheduler). The
2676 other workaround is idle=poll boot option.
2677
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07002678config OLPC
2679 bool "One Laptop Per Child support"
Thomas Gleixner54008972011-02-23 09:50:15 +01002680 depends on !X86_PAE
Andres Salomon3c554942009-12-14 18:00:36 -08002681 select GPIOLIB
Thomas Gleixnerdc3119e702011-02-23 10:08:31 +01002682 select OF
Daniel Drake45bb1672011-03-13 15:10:17 +00002683 select OF_PROMTREE
Grant Likelyb4e51852011-12-16 15:50:17 -07002684 select IRQ_DOMAIN
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002685 ---help---
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07002686 Add support for detecting the unique features of the OLPC
2687 XO hardware.
2688
Daniel Drakea3128582011-06-25 17:34:10 +01002689config OLPC_XO1_PM
2690 bool "OLPC XO-1 Power Management"
Daniel Drake97c4cb72011-06-25 17:34:11 +01002691 depends on OLPC && MFD_CS5535 && PM_SLEEP
Daniel Drakea3128582011-06-25 17:34:10 +01002692 select MFD_CORE
Daniel Drakebf1ebf02010-10-10 10:40:32 +01002693 ---help---
Daniel Drake97c4cb72011-06-25 17:34:11 +01002694 Add support for poweroff and suspend of the OLPC XO-1 laptop.
Daniel Drakebf1ebf02010-10-10 10:40:32 +01002695
Daniel Drakecfee9592011-06-25 17:34:17 +01002696config OLPC_XO1_RTC
2697 bool "OLPC XO-1 Real Time Clock"
2698 depends on OLPC_XO1_PM && RTC_DRV_CMOS
2699 ---help---
2700 Add support for the XO-1 real time clock, which can be used as a
2701 programmable wakeup source.
2702
Daniel Drake7feda8e2011-06-25 17:34:12 +01002703config OLPC_XO1_SCI
2704 bool "OLPC XO-1 SCI extras"
Daniel Draked8d01a62011-07-24 18:33:21 +01002705 depends on OLPC && OLPC_XO1_PM
Randy Dunlaped8e47f2012-12-18 12:22:17 -08002706 depends on INPUT=y
Daniel Draked8d01a62011-07-24 18:33:21 +01002707 select POWER_SUPPLY
Daniel Drake7feda8e2011-06-25 17:34:12 +01002708 select GPIO_CS5535
2709 select MFD_CORE
2710 ---help---
2711 Add support for SCI-based features of the OLPC XO-1 laptop:
Daniel Drake7bc74b32011-06-25 17:34:14 +01002712 - EC-driven system wakeups
Daniel Drake7feda8e2011-06-25 17:34:12 +01002713 - Power button
Daniel Drake7bc74b32011-06-25 17:34:14 +01002714 - Ebook switch
Daniel Drake2cf2bae2011-06-25 17:34:15 +01002715 - Lid switch
Daniel Drakee1040ac2011-06-25 17:34:16 +01002716 - AC adapter status updates
2717 - Battery status updates
Daniel Drake7feda8e2011-06-25 17:34:12 +01002718
Daniel Drakea0f30f52011-06-25 17:34:18 +01002719config OLPC_XO15_SCI
2720 bool "OLPC XO-1.5 SCI extras"
Daniel Draked8d01a62011-07-24 18:33:21 +01002721 depends on OLPC && ACPI
2722 select POWER_SUPPLY
Daniel Drakea0f30f52011-06-25 17:34:18 +01002723 ---help---
2724 Add support for SCI-based features of the OLPC XO-1.5 laptop:
2725 - EC-driven system wakeups
2726 - AC adapter status updates
2727 - Battery status updates
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002728
Ed Wildgoosed4f3e352011-09-20 14:00:12 -07002729config ALIX
2730 bool "PCEngines ALIX System Support (LED setup)"
2731 select GPIOLIB
2732 ---help---
2733 This option enables system support for the PCEngines ALIX.
2734 At present this just sets up LEDs for GPIO control on
2735 ALIX2/3/6 boards. However, other system specific setup should
2736 get added here.
2737
2738 Note: You must still enable the drivers for GPIO and LED support
2739 (GPIO_CS5535 & LEDS_GPIO) to actually use the LEDs
2740
2741 Note: You have to set alix.force=1 for boards with Award BIOS.
2742
Philip Prindevilleda4e3302012-03-05 15:05:15 -08002743config NET5501
2744 bool "Soekris Engineering net5501 System Support (LEDS, GPIO, etc)"
2745 select GPIOLIB
2746 ---help---
2747 This option enables system support for the Soekris Engineering net5501.
2748
Philip A. Prindeville31970592012-01-14 01:45:39 -07002749config GEOS
2750 bool "Traverse Technologies GEOS System Support (LEDS, GPIO, etc)"
2751 select GPIOLIB
2752 depends on DMI
2753 ---help---
2754 This option enables system support for the Traverse Technologies GEOS.
2755
Vivien Didelot7d029122013-01-04 16:18:14 -05002756config TS5500
2757 bool "Technologic Systems TS-5500 platform support"
2758 depends on MELAN
2759 select CHECK_SIGNATURE
2760 select NEW_LEDS
2761 select LEDS_CLASS
2762 ---help---
2763 This option enables system support for the Technologic Systems TS-5500.
2764
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002765endif # X86_32
2766
Andreas Herrmann23ac4ae2010-09-17 18:03:43 +02002767config AMD_NB
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002768 def_bool y
Borislav Petkov0e152cd2010-03-12 15:43:03 +01002769 depends on CPU_SUP_AMD && PCI
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002770
2771source "drivers/pcmcia/Kconfig"
2772
Alexandre Bounine388b78a2011-03-23 16:43:03 -07002773config RAPIDIO
Alexandre Bouninefdf90ab2013-07-03 15:08:56 -07002774 tristate "RapidIO support"
Alexandre Bounine388b78a2011-03-23 16:43:03 -07002775 depends on PCI
2776 default n
2777 help
Alexandre Bouninefdf90ab2013-07-03 15:08:56 -07002778 If enabled this option will include drivers and the core
Alexandre Bounine388b78a2011-03-23 16:43:03 -07002779 infrastructure code to support RapidIO interconnect devices.
2780
2781source "drivers/rapidio/Kconfig"
2782
David Herrmanne3263ab2013-08-02 14:05:22 +02002783config X86_SYSFB
2784 bool "Mark VGA/VBE/EFI FB as generic system framebuffer"
2785 help
2786 Firmwares often provide initial graphics framebuffers so the BIOS,
2787 bootloader or kernel can show basic video-output during boot for
2788 user-guidance and debugging. Historically, x86 used the VESA BIOS
2789 Extensions and EFI-framebuffers for this, which are mostly limited
2790 to x86.
2791 This option, if enabled, marks VGA/VBE/EFI framebuffers as generic
2792 framebuffers so the new generic system-framebuffer drivers can be
2793 used on x86. If the framebuffer is not compatible with the generic
2794 modes, it is adverticed as fallback platform framebuffer so legacy
2795 drivers like efifb, vesafb and uvesafb can pick it up.
2796 If this option is not selected, all system framebuffers are always
2797 marked as fallback platform framebuffers as usual.
2798
2799 Note: Legacy fbdev drivers, including vesafb, efifb, uvesafb, will
2800 not be able to pick up generic system framebuffers if this option
2801 is selected. You are highly encouraged to enable simplefb as
2802 replacement if you select this option. simplefb can correctly deal
2803 with generic system framebuffers. But you should still keep vesafb
2804 and others enabled as fallback if a system framebuffer is
2805 incompatible with simplefb.
2806
2807 If unsure, say Y.
2808
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002809endmenu
2810
2811
2812menu "Executable file formats / Emulations"
2813
2814source "fs/Kconfig.binfmt"
2815
2816config IA32_EMULATION
2817 bool "IA32 Emulation"
2818 depends on X86_64
Ingo Molnar39f88912016-11-15 10:22:52 +01002819 select ARCH_WANT_OLD_COMPAT_IPC
Randy Dunlapd1603992013-06-18 12:33:40 -07002820 select BINFMT_ELF
Roland McGratha97f52e2008-01-30 13:31:55 +01002821 select COMPAT_BINFMT_ELF
Ingo Molnar39f88912016-11-15 10:22:52 +01002822 select COMPAT_OLD_SIGACTION
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002823 ---help---
H. J. Lu5fd92e62012-02-19 10:40:03 -08002824 Include code to run legacy 32-bit programs under a
2825 64-bit kernel. You should likely turn this on, unless you're
2826 100% sure that you don't have any 32-bit programs left.
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002827
2828config IA32_AOUT
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002829 tristate "IA32 a.out support"
2830 depends on IA32_EMULATION
2831 ---help---
2832 Support old a.out binaries in the 32bit emulation.
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002833
H. Peter Anvin0bf62762012-02-27 14:09:10 -08002834config X86_X32
Kees Cook6ea30382012-10-02 11:16:47 -07002835 bool "x32 ABI for 64-bit mode"
Brian Gerst9b540502015-06-22 07:55:21 -04002836 depends on X86_64
H. J. Lu5fd92e62012-02-19 10:40:03 -08002837 ---help---
2838 Include code to run binaries for the x32 native 32-bit ABI
2839 for 64-bit processors. An x32 process gets access to the
2840 full 64-bit register file and wide data path while leaving
2841 pointers at 32 bits for smaller memory footprint.
2842
2843 You will need a recent binutils (2.22 or later) with
2844 elf32_x86_64 support enabled to compile a kernel with this
2845 option set.
2846
Ingo Molnar953fee12016-11-15 10:22:52 +01002847config COMPAT_32
2848 def_bool y
2849 depends on IA32_EMULATION || X86_32
2850 select HAVE_UID16
2851 select OLD_SIGSUSPEND3
2852
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002853config COMPAT
Harvey Harrison3c2362e2008-01-30 13:31:03 +01002854 def_bool y
H. Peter Anvin0bf62762012-02-27 14:09:10 -08002855 depends on IA32_EMULATION || X86_X32
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002856
Jan Beulich3120e252012-09-10 12:41:45 +01002857if COMPAT
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002858config COMPAT_FOR_U64_ALIGNMENT
Jan Beulich3120e252012-09-10 12:41:45 +01002859 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002860
2861config SYSVIPC_COMPAT
Harvey Harrison3c2362e2008-01-30 13:31:03 +01002862 def_bool y
Jan Beulich3120e252012-09-10 12:41:45 +01002863 depends on SYSVIPC
Jan Beulich3120e252012-09-10 12:41:45 +01002864endif
David Howellsee009e4a02011-03-07 15:06:20 +00002865
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002866endmenu
2867
2868
Keith Packarde5beae12008-11-03 18:21:45 +01002869config HAVE_ATOMIC_IOMAP
2870 def_bool y
2871 depends on X86_32
2872
Alessandro Rubini4692d772012-04-04 19:39:58 +02002873config X86_DEV_DMA_OPS
2874 bool
Alessandro Rubini83125a32012-04-04 19:40:21 +02002875 depends on X86_64 || STA2X11
Alessandro Rubini4692d772012-04-04 19:39:58 +02002876
Alessandro Rubinif7219a52012-04-04 19:40:10 +02002877config X86_DMA_REMAP
2878 bool
Alessandro Rubini83125a32012-04-04 19:40:21 +02002879 depends on STA2X11
Alessandro Rubinif7219a52012-04-04 19:40:10 +02002880
Kirill A. Shutemove5855132017-06-06 14:31:20 +03002881config HAVE_GENERIC_GUP
2882 def_bool y
2883
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002884source "net/Kconfig"
2885
2886source "drivers/Kconfig"
2887
2888source "drivers/firmware/Kconfig"
2889
2890source "fs/Kconfig"
2891
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002892source "arch/x86/Kconfig.debug"
2893
2894source "security/Kconfig"
2895
2896source "crypto/Kconfig"
2897
Avi Kivityedf88412007-12-16 11:02:48 +02002898source "arch/x86/kvm/Kconfig"
2899
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002900source "lib/Kconfig"