blob: e23d21ac745a15fe4278c55caaaa754f4692a784 [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.
59 select ARCH_HAS_REFCOUNT if BROKEN
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
Thomas Gleixner61dc0f52018-01-07 22:48:01 +010092 select GENERIC_CPU_VULNERABILITIES
Ingo Molnar6471b822015-06-03 10:00:13 +020093 select GENERIC_EARLY_IOREMAP
94 select GENERIC_FIND_FIRST_BIT
95 select GENERIC_IOMAP
Thomas Gleixnerc7d6c9d2017-06-20 01:37:46 +020096 select GENERIC_IRQ_EFFECTIVE_AFF_MASK if SMP
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
99 select GENERIC_IRQ_SHOW
100 select GENERIC_PENDING_IRQ if SMP
101 select GENERIC_SMP_IDLE_THREAD
102 select GENERIC_STRNCPY_FROM_USER
103 select GENERIC_STRNLEN_USER
104 select GENERIC_TIME_VSYSCALL
Thomas Gleixner7edaeb62017-08-15 09:50:13 +0200105 select HARDLOCKUP_CHECK_TIMESTAMP if X86_64
Ingo Molnar6471b822015-06-03 10:00:13 +0200106 select HAVE_ACPI_APEI if ACPI
107 select HAVE_ACPI_APEI_NMI if ACPI
108 select HAVE_ALIGNED_STRUCT_PAGE if SLUB
Ingo Molnar6471b822015-06-03 10:00:13 +0200109 select HAVE_ARCH_AUDITSYSCALL
110 select HAVE_ARCH_HUGE_VMAP if X86_64 || X86_PAE
111 select HAVE_ARCH_JUMP_LABEL
Andrey Ryabinin2aeb0732017-11-15 17:36:35 -0800112 select HAVE_ARCH_KASAN if X86_64
Ingo Molnar6471b822015-06-03 10:00:13 +0200113 select HAVE_ARCH_KGDB
114 select HAVE_ARCH_KMEMCHECK
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
Ingo Molnar6471b822015-06-03 10:00:13 +0200119 select HAVE_ARCH_TRACEHOOK
120 select HAVE_ARCH_TRANSPARENT_HUGEPAGE
Matthew Wilcoxa00cc7d2017-02-24 14:57:02 -0800121 select HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD if X86_64
Andy Lutomirskie37e43a2016-08-11 02:35:23 -0700122 select HAVE_ARCH_VMAP_STACK if X86_64
Ingo Molnarc763ea22016-11-15 10:26:39 +0100123 select HAVE_ARCH_WITHIN_STACK_FRAMES
Ingo Molnar6471b822015-06-03 10:00:13 +0200124 select HAVE_CC_STACKPROTECTOR
125 select HAVE_CMPXCHG_DOUBLE
126 select HAVE_CMPXCHG_LOCAL
127 select HAVE_CONTEXT_TRACKING if X86_64
Josh Triplettc1bd55f2015-06-30 15:00:00 -0700128 select HAVE_COPY_THREAD_TLS
Ingo Molnar6471b822015-06-03 10:00:13 +0200129 select HAVE_C_RECORDMCOUNT
130 select HAVE_DEBUG_KMEMLEAK
131 select HAVE_DEBUG_STACKOVERFLOW
132 select HAVE_DMA_API_DEBUG
Akinobu Mita9c5a3622014-06-04 16:06:50 -0700133 select HAVE_DMA_CONTIGUOUS
Steven Rostedt677aa9f2008-05-17 00:01:36 -0400134 select HAVE_DYNAMIC_FTRACE
Masami Hiramatsu06aeaae2012-09-28 17:15:17 +0900135 select HAVE_DYNAMIC_FTRACE_WITH_REGS
Ingo Molnarc763ea22016-11-15 10:26:39 +0100136 select HAVE_EBPF_JIT if X86_64
Johannes Berg58340a02008-07-25 01:45:33 -0700137 select HAVE_EFFICIENT_UNALIGNED_ACCESS
Jiri Slaby5f56a5d2016-05-20 17:00:16 -0700138 select HAVE_EXIT_THREAD
Steven Rostedt (VMware)644e0e82017-03-23 10:33:52 -0400139 select HAVE_FENTRY if X86_64 || DYNAMIC_FTRACE
Ingo Molnar6471b822015-06-03 10:00:13 +0200140 select HAVE_FTRACE_MCOUNT_RECORD
Ingo Molnar6471b822015-06-03 10:00:13 +0200141 select HAVE_FUNCTION_GRAPH_TRACER
142 select HAVE_FUNCTION_TRACER
Emese Revfy6b90bd42016-05-24 00:09:38 +0200143 select HAVE_GCC_PLUGINS
K.Prasad0067f122009-06-01 23:43:57 +0530144 select HAVE_HW_BREAKPOINT
Ingo Molnar6471b822015-06-03 10:00:13 +0200145 select HAVE_IDE
146 select HAVE_IOREMAP_PROT
147 select HAVE_IRQ_EXIT_ON_IRQ_STACK if X86_64
148 select HAVE_IRQ_TIME_ACCOUNTING
149 select HAVE_KERNEL_BZIP2
150 select HAVE_KERNEL_GZIP
151 select HAVE_KERNEL_LZ4
152 select HAVE_KERNEL_LZMA
153 select HAVE_KERNEL_LZO
154 select HAVE_KERNEL_XZ
155 select HAVE_KPROBES
156 select HAVE_KPROBES_ON_FTRACE
157 select HAVE_KRETPROBES
158 select HAVE_KVM
159 select HAVE_LIVEPATCH if X86_64
160 select HAVE_MEMBLOCK
161 select HAVE_MEMBLOCK_NODE_MAP
Frederic Weisbecker01027522010-04-11 18:55:56 +0200162 select HAVE_MIXED_BREAKPOINTS_REGS
Josh Poimboeufee9f8fc2017-07-24 18:36:57 -0500163 select HAVE_MOD_ARCH_SPECIFIC
Petr Mladek42a0bb32016-05-20 17:00:33 -0700164 select HAVE_NMI
Ingo Molnar6471b822015-06-03 10:00:13 +0200165 select HAVE_OPROFILE
166 select HAVE_OPTPROBES
167 select HAVE_PCSPKR_PLATFORM
168 select HAVE_PERF_EVENTS
Frederic Weisbeckerc01d4322010-05-15 22:57:48 +0200169 select HAVE_PERF_EVENTS_NMI
Nicholas Piggin92e5aae2017-08-18 15:15:51 -0700170 select HAVE_HARDLOCKUP_DETECTOR_PERF if PERF_EVENTS && HAVE_PERF_EVENTS_NMI
Jiri Olsac5e63192012-08-07 15:20:36 +0200171 select HAVE_PERF_REGS
Jiri Olsac5ebced2012-08-07 15:20:40 +0200172 select HAVE_PERF_USER_STACK_DUMP
Vitaly Kuznetsov9e52fc22017-08-28 10:22:51 +0200173 select HAVE_RCU_TABLE_FREE
Ingo Molnar6471b822015-06-03 10:00:13 +0200174 select HAVE_REGS_AND_STACK_ACCESS_API
Josh Poimboeuf11af8472017-10-13 15:02:00 -0500175 select HAVE_RELIABLE_STACKTRACE if X86_64 && UNWINDER_FRAME_POINTER && STACK_VALIDATION
Ingo Molnarc763ea22016-11-15 10:26:39 +0100176 select HAVE_STACK_VALIDATION if X86_64
Ingo Molnar6471b822015-06-03 10:00:13 +0200177 select HAVE_SYSCALL_TRACEPOINTS
Ingo Molnar6471b822015-06-03 10:00:13 +0200178 select HAVE_UNSTABLE_SCHED_CLOCK
Avi Kivity7c68af62009-09-19 09:40:22 +0300179 select HAVE_USER_RETURN_NOTIFIER
Thomas Gleixnerc01858082011-02-07 02:24:08 +0100180 select IRQ_FORCED_THREADING
Thomas Gleixnerdf65c1b2017-03-16 22:50:07 +0100181 select PCI_LOCKLESS_CONFIG
Ingo Molnar6471b822015-06-03 10:00:13 +0200182 select PERF_EVENTS
Prarit Bhargava3195ef52013-02-14 12:02:54 -0500183 select RTC_LIB
Arnd Bergmannd6faca42016-06-01 16:46:23 +0200184 select RTC_MC146818_LIB
Ingo Molnar6471b822015-06-03 10:00:13 +0200185 select SPARSE_IRQ
Pranith Kumar83fe27e2014-12-05 11:24:45 -0500186 select SRCU
Ingo Molnar6471b822015-06-03 10:00:13 +0200187 select SYSCTL_EXCEPTION_TRACE
Andy Lutomirski15f4eae2016-09-13 14:29:25 -0700188 select THREAD_INFO_IN_TASK
Ingo Molnar6471b822015-06-03 10:00:13 +0200189 select USER_STACKTRACE_SUPPORT
190 select VIRT_TO_BUS
Ingo Molnar6471b822015-06-03 10:00:13 +0200191 select X86_FEATURE_NAMES if PROC_FS
Balbir Singh7d8330a2008-02-10 12:46:28 +0530192
Ingo Molnarba7e4d12009-06-06 13:58:12 +0200193config INSTRUCTION_DECODER
Jan Beulich3120e252012-09-10 12:41:45 +0100194 def_bool y
195 depends on KPROBES || PERF_EVENTS || UPROBES
Ingo Molnarba7e4d12009-06-06 13:58:12 +0200196
Linus Torvalds51b26ad2009-04-26 10:12:47 -0700197config OUTPUT_FORMAT
198 string
199 default "elf32-i386" if X86_32
200 default "elf64-x86-64" if X86_64
201
Sam Ravnborg73531902008-05-25 23:03:18 +0200202config ARCH_DEFCONFIG
Sam Ravnborgb9b39bfb2008-04-29 12:48:15 +0200203 string
Sam Ravnborg73531902008-05-25 23:03:18 +0200204 default "arch/x86/configs/i386_defconfig" if X86_32
205 default "arch/x86/configs/x86_64_defconfig" if X86_64
Sam Ravnborgb9b39bfb2008-04-29 12:48:15 +0200206
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100207config LOCKDEP_SUPPORT
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100208 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100209
210config STACKTRACE_SUPPORT
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100211 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100212
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100213config MMU
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100214 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100215
Daniel Cashman9e08f572016-01-14 15:20:06 -0800216config ARCH_MMAP_RND_BITS_MIN
217 default 28 if 64BIT
218 default 8
219
220config ARCH_MMAP_RND_BITS_MAX
221 default 32 if 64BIT
222 default 16
223
224config ARCH_MMAP_RND_COMPAT_BITS_MIN
225 default 8
226
227config ARCH_MMAP_RND_COMPAT_BITS_MAX
228 default 16
229
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100230config SBUS
231 bool
232
FUJITA Tomonori3bc4e452010-03-10 15:23:22 -0800233config NEED_DMA_MAP_STATE
Jan Beulich3120e252012-09-10 12:41:45 +0100234 def_bool y
Konrad Rzeszutek Wilka6dfa122015-04-17 15:04:48 -0400235 depends on X86_64 || INTEL_IOMMU || DMA_API_DEBUG || SWIOTLB
FUJITA Tomonori3bc4e452010-03-10 15:23:22 -0800236
FUJITA Tomonori18e98302010-05-26 14:44:32 -0700237config NEED_SG_DMA_LENGTH
Andrew Morton4a14d842010-05-26 14:44:33 -0700238 def_bool y
FUJITA Tomonori18e98302010-05-26 14:44:32 -0700239
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100240config GENERIC_ISA_DMA
Jan Beulich3120e252012-09-10 12:41:45 +0100241 def_bool y
242 depends on ISA_DMA_API
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100243
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100244config GENERIC_BUG
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100245 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100246 depends on BUG
Jan Beulichb93a5312008-12-16 11:40:27 +0000247 select GENERIC_BUG_RELATIVE_POINTERS if X86_64
248
249config GENERIC_BUG_RELATIVE_POINTERS
250 bool
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100251
252config GENERIC_HWEIGHT
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100253 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100254
255config ARCH_MAY_HAVE_PC_FDC
Jan Beulich3120e252012-09-10 12:41:45 +0100256 def_bool y
257 depends on ISA_DMA_API
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100258
Sam Ravnborg1032c0b2007-11-06 21:35:08 +0100259config RWSEM_XCHGADD_ALGORITHM
Jan Beulich3120e252012-09-10 12:41:45 +0100260 def_bool y
Sam Ravnborg1032c0b2007-11-06 21:35:08 +0100261
Sam Ravnborg1032c0b2007-11-06 21:35:08 +0100262config GENERIC_CALIBRATE_DELAY
263 def_bool y
264
venkatesh.pallipadi@intel.com9a0b8412008-01-31 17:35:06 -0800265config ARCH_HAS_CPU_RELAX
266 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100267
Pekka Enberg1b27d052008-04-28 02:12:22 -0700268config ARCH_HAS_CACHE_LINE_SIZE
269 def_bool y
270
Mike Travisdd5af902008-01-30 13:33:32 +0100271config HAVE_SETUP_PER_CPU_AREA
Brian Gerst89c9c4c2009-01-27 12:56:48 +0900272 def_bool y
travis@sgi.comb32ef632008-01-30 13:32:51 +0100273
Tejun Heo08fc4582009-08-14 15:00:49 +0900274config NEED_PER_CPU_EMBED_FIRST_CHUNK
275 def_bool y
276
277config NEED_PER_CPU_PAGE_FIRST_CHUNK
Tejun Heo11124412009-02-20 16:29:09 +0900278 def_bool y
279
Johannes Berg801e4062007-12-08 02:12:39 +0100280config ARCH_HIBERNATION_POSSIBLE
281 def_bool y
Johannes Berg801e4062007-12-08 02:12:39 +0100282
Johannes Bergf4cb5702007-12-08 02:14:00 +0100283config ARCH_SUSPEND_POSSIBLE
284 def_bool y
Johannes Bergf4cb5702007-12-08 02:14:00 +0100285
Steve Cappercfe28c52013-04-29 14:29:48 +0100286config ARCH_WANT_HUGE_PMD_SHARE
287 def_bool y
288
Steve Capper53313b22013-04-30 08:03:42 +0100289config ARCH_WANT_GENERAL_HUGETLB
290 def_bool y
291
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100292config ZONE_DMA32
Jan Beuliche0fd24a2015-02-05 15:39:34 +0000293 def_bool y if X86_64
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100294
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100295config AUDIT_ARCH
Jan Beuliche0fd24a2015-02-05 15:39:34 +0000296 def_bool y if X86_64
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100297
Ingo Molnar765c68b2008-04-09 11:03:37 +0200298config ARCH_SUPPORTS_OPTIMIZED_INLINING
299 def_bool y
300
Akinobu Mita6a11f752009-03-31 15:23:17 -0700301config ARCH_SUPPORTS_DEBUG_PAGEALLOC
302 def_bool y
303
Andrey Ryabinind6f2d752015-07-02 12:09:38 +0300304config KASAN_SHADOW_OFFSET
305 hex
306 depends on KASAN
307 default 0xdffffc0000000000
308
Shane Wang69575d32009-09-01 18:25:07 -0700309config HAVE_INTEL_TXT
310 def_bool y
Kees Cook6ea30382012-10-02 11:16:47 -0700311 depends on INTEL_IOMMU && ACPI
Shane Wang69575d32009-09-01 18:25:07 -0700312
Sam Ravnborg6b0c3d42008-01-30 13:32:27 +0100313config X86_32_SMP
314 def_bool y
315 depends on X86_32 && SMP
316
317config X86_64_SMP
318 def_bool y
319 depends on X86_64 && SMP
320
Tejun Heoccbeed32009-02-09 22:17:40 +0900321config X86_32_LAZY_GS
322 def_bool y
Tejun Heo60a53172009-02-09 22:17:40 +0900323 depends on X86_32 && !CC_STACKPROTECTOR
Tejun Heoccbeed32009-02-09 22:17:40 +0900324
Srikar Dronamraju2b144492012-02-09 14:56:42 +0530325config ARCH_SUPPORTS_UPROBES
326 def_bool y
327
Rob Herringd20642f2014-04-18 17:19:54 -0500328config FIX_EARLYCON_MEM
329 def_bool y
330
Kirill A. Shutemov98233362015-04-14 15:46:14 -0700331config PGTABLE_LEVELS
332 int
Kirill A. Shutemov77ef56e2017-07-17 01:59:54 +0300333 default 5 if X86_5LEVEL
Kirill A. Shutemov98233362015-04-14 15:46:14 -0700334 default 4 if X86_64
335 default 3 if X86_PAE
336 default 2
337
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100338source "init/Kconfig"
Matt Helsleydc52ddc2008-10-18 20:27:21 -0700339source "kernel/Kconfig.freezer"
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100340
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100341menu "Processor type and features"
342
Randy Dunlap5ee71532012-01-16 11:57:18 -0800343config ZONE_DMA
344 bool "DMA memory allocation support" if EXPERT
345 default y
346 help
347 DMA memory allocation support allows devices with less than 32-bit
348 addressing to allocate within the first 16MB of address space.
349 Disable if no such devices will be used.
350
351 If unsure, say Y.
352
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100353config SMP
354 bool "Symmetric multi-processing support"
355 ---help---
356 This enables support for systems with more than one CPU. If you have
Robert Graffham4a474152014-01-23 15:55:29 -0800357 a system with only one CPU, say N. If you have a system with more
358 than one CPU, say Y.
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100359
Robert Graffham4a474152014-01-23 15:55:29 -0800360 If you say N here, the kernel will run on uni- and multiprocessor
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100361 machines, but will use only one CPU of a multiprocessor machine. If
362 you say Y here, the kernel will run on many, but not all,
Robert Graffham4a474152014-01-23 15:55:29 -0800363 uniprocessor machines. On a uniprocessor machine, the kernel
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100364 will run faster if you say N here.
365
366 Note that if you say Y here and choose architecture "586" or
367 "Pentium" under "Processor family", the kernel will not work on 486
368 architectures. Similarly, multiprocessor kernels for the "PPro"
369 architecture may not work on all Pentium based boards.
370
371 People using multiprocessor machines who say Y here should also say
372 Y to "Enhanced Real Time Clock Support", below. The "Advanced Power
373 Management" code will be disabled if you say Y here.
374
Paul Bolle395cf962011-08-15 02:02:26 +0200375 See also <file:Documentation/x86/i386/IO-APIC.txt>,
Benjamin Petersonc9525a32017-05-20 17:20:16 -0700376 <file:Documentation/lockup-watchdogs.txt> and the SMP-HOWTO available at
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100377 <http://www.tldp.org/docs.html#howto>.
378
379 If you don't know what to do here, say N.
380
Josh Triplett9def39be2013-10-30 08:09:45 -0700381config X86_FEATURE_NAMES
382 bool "Processor feature human-readable names" if EMBEDDED
383 default y
384 ---help---
385 This option compiles in a table of x86 feature bits and corresponding
386 names. This is required to support /proc/cpuinfo and a few kernel
387 messages. You can disable this to save space, at the expense of
388 making those few kernel messages show numeric feature bits instead.
389
390 If in doubt, say Y.
391
Borislav Petkov6e1315f2015-12-07 10:39:42 +0100392config X86_FAST_FEATURE_TESTS
393 bool "Fast CPU feature tests" if EMBEDDED
394 default y
395 ---help---
396 Some fast-paths in the kernel depend on the capabilities of the CPU.
397 Say Y here for the kernel to patch in the appropriate code at runtime
398 based on the capabilities of the CPU. The infrastructure for patching
399 code at runtime takes up some additional space; space-constrained
400 embedded systems may wish to say N here to produce smaller, slightly
401 slower code.
402
Yinghai Lu06cd9a72009-02-16 17:29:58 -0800403config X86_X2APIC
404 bool "Support x2apic"
Jan Kiszka19e3d602015-05-04 17:58:01 +0200405 depends on X86_LOCAL_APIC && X86_64 && (IRQ_REMAP || HYPERVISOR_GUEST)
Yinghai Lu06cd9a72009-02-16 17:29:58 -0800406 ---help---
407 This enables x2apic support on CPUs that have this feature.
408
409 This allows 32-bit apic IDs (so it can support very large systems),
410 and accesses the local apic via MSRs not via mmio.
411
Yinghai Lu06cd9a72009-02-16 17:29:58 -0800412 If you don't know what to do here, say N.
413
Yinghai Lu6695c852008-06-19 12:13:09 -0700414config X86_MPPARSE
Bin Gao6e87f9b72012-10-25 09:35:44 -0700415 bool "Enable MPS table" if ACPI || SFI
Jan Beulich7a527682008-10-30 10:38:24 +0000416 default y
Ingo Molnar5ab74722008-07-10 14:42:03 +0200417 depends on X86_LOCAL_APIC
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100418 ---help---
Yinghai Lu6695c852008-06-19 12:13:09 -0700419 For old smp systems that do not have proper acpi support. Newer systems
420 (esp with 64bit cpus) with acpi support, MADT and DSDT will override it
Yinghai Lu6695c852008-06-19 12:13:09 -0700421
Yinghai Lu26f7ef12009-01-29 14:19:22 -0800422config X86_BIGSMP
423 bool "Support for big SMP systems with more than 8 CPUs"
424 depends on X86_32 && SMP
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100425 ---help---
Yinghai Lu26f7ef12009-01-29 14:19:22 -0800426 This option is needed for the systems that have more than 8 CPUs
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100427
Jun Nakajimaddd70cf2013-01-21 17:23:09 +0000428config GOLDFISH
429 def_bool y
430 depends on X86_GOLDFISH
431
Vikas Shivappaf01d7d52017-07-25 14:14:22 -0700432config INTEL_RDT
433 bool "Intel Resource Director Technology support"
Fenghua Yu78e99b42016-10-22 06:19:53 -0700434 default n
435 depends on X86 && CPU_SUP_INTEL
Thomas Gleixner59fe5a72016-11-15 15:17:12 +0100436 select KERNFS
Fenghua Yu78e99b42016-10-22 06:19:53 -0700437 help
Vikas Shivappaf01d7d52017-07-25 14:14:22 -0700438 Select to enable resource allocation and monitoring which are
439 sub-features of Intel Resource Director Technology(RDT). More
440 information about RDT can be found in the Intel x86
441 Architecture Software Developer Manual.
Fenghua Yu78e99b42016-10-22 06:19:53 -0700442
443 Say N if unsure.
444
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800445if X86_32
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800446config X86_EXTENDED_PLATFORM
447 bool "Support for extended (non-PC) x86 platforms"
448 default y
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100449 ---help---
Ingo Molnar06ac8342009-01-27 18:11:43 +0100450 If you disable this option then the kernel will only support
451 standard PC platforms. (which covers the vast majority of
452 systems out there.)
453
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800454 If you enable this option then you'll be able to select support
455 for the following (non-PC) 32 bit x86 platforms:
Ben Hutchingscb7b8022013-06-24 01:05:25 +0100456 Goldfish (Android emulator)
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800457 AMD Elan
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800458 RDC R-321x SoC
459 SGI 320/540 (Visual Workstation)
Alessandro Rubini83125a32012-04-04 19:40:21 +0200460 STA2X11-based (e.g. Northville)
Thomas Gleixner3f4110a2009-08-29 14:54:20 +0200461 Moorestown MID devices
Ingo Molnar06ac8342009-01-27 18:11:43 +0100462
463 If you have one of these systems, or if you want to build a
464 generic distribution kernel, say Y here - otherwise say N.
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800465endif
Ingo Molnar06ac8342009-01-27 18:11:43 +0100466
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800467if X86_64
468config X86_EXTENDED_PLATFORM
469 bool "Support for extended (non-PC) x86 platforms"
470 default y
471 ---help---
472 If you disable this option then the kernel will only support
473 standard PC platforms. (which covers the vast majority of
474 systems out there.)
475
476 If you enable this option then you'll be able to select support
477 for the following (non-PC) 64 bit x86 platforms:
Steffen Persvold44b111b52011-12-06 00:07:26 +0800478 Numascale NumaChip
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800479 ScaleMP vSMP
480 SGI Ultraviolet
481
482 If you have one of these systems, or if you want to build a
483 generic distribution kernel, say Y here - otherwise say N.
484endif
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800485# This is an alphabetically sorted list of 64 bit extended platforms
486# Please maintain the alphabetic order if and when there are additions
Steffen Persvold44b111b52011-12-06 00:07:26 +0800487config X86_NUMACHIP
488 bool "Numascale NumaChip"
489 depends on X86_64
490 depends on X86_EXTENDED_PLATFORM
491 depends on NUMA
492 depends on SMP
493 depends on X86_X2APIC
Daniel J Bluemanf9726bf2012-12-07 14:24:32 -0700494 depends on PCI_MMCONFIG
Steffen Persvold44b111b52011-12-06 00:07:26 +0800495 ---help---
496 Adds support for Numascale NumaChip large-SMP systems. Needed to
497 enable more than ~168 cores.
498 If you don't have one of these, you should say N here.
Nick Piggin03b48632009-01-20 04:36:04 +0100499
Ingo Molnar6a485652009-01-27 18:29:13 +0100500config X86_VSMP
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800501 bool "ScaleMP vSMP"
Borislav Petkov6276a072013-03-04 21:20:21 +0100502 select HYPERVISOR_GUEST
Ingo Molnar6a485652009-01-27 18:29:13 +0100503 select PARAVIRT
504 depends on X86_64 && PCI
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800505 depends on X86_EXTENDED_PLATFORM
Shai Fultheimead91d42012-04-16 10:39:35 +0300506 depends on SMP
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100507 ---help---
Ingo Molnar6a485652009-01-27 18:29:13 +0100508 Support for ScaleMP vSMP systems. Say 'Y' here if this kernel is
509 supposed to run on these EM64T-based machines. Only choose this option
510 if you have one of these machines.
511
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800512config X86_UV
513 bool "SGI Ultraviolet"
514 depends on X86_64
515 depends on X86_EXTENDED_PLATFORM
Jack Steiner54c28d22009-04-03 15:39:42 -0500516 depends on NUMA
Andrew Morton1ecb4ae2016-02-11 16:13:20 -0800517 depends on EFI
Suresh Siddha9d6c26e2009-04-20 13:02:31 -0700518 depends on X86_X2APIC
Ingo Molnar1222e562015-05-06 06:23:59 +0200519 depends on PCI
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800520 ---help---
521 This option is needed in order to support SGI Ultraviolet systems.
522 If you don't have one of these, you should say N here.
523
524# Following is an alphabetically sorted list of 32 bit extended platforms
525# Please maintain the alphabetic order if and when there are additions
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100526
Jun Nakajimaddd70cf2013-01-21 17:23:09 +0000527config X86_GOLDFISH
528 bool "Goldfish (Virtual Platform)"
Ben Hutchingscb7b8022013-06-24 01:05:25 +0100529 depends on X86_EXTENDED_PLATFORM
Jun Nakajimaddd70cf2013-01-21 17:23:09 +0000530 ---help---
531 Enable support for the Goldfish virtual platform used primarily
532 for Android development. Unless you are building for the Android
533 Goldfish emulator say N here.
534
Thomas Gleixnerc751e172010-11-09 12:08:04 -0800535config X86_INTEL_CE
536 bool "CE4100 TV platform"
537 depends on PCI
538 depends on PCI_GODIRECT
Jiang Liu6084a6e2014-06-09 16:19:46 +0800539 depends on X86_IO_APIC
Thomas Gleixnerc751e172010-11-09 12:08:04 -0800540 depends on X86_32
541 depends on X86_EXTENDED_PLATFORM
Dirk Brandewie37bc9f52010-11-09 12:08:08 -0800542 select X86_REBOOTFIXUPS
Sebastian Andrzej Siewiorda6b7372011-02-22 21:07:37 +0100543 select OF
544 select OF_EARLY_FLATTREE
Thomas Gleixnerc751e172010-11-09 12:08:04 -0800545 ---help---
546 Select for the Intel CE media processor (CE4100) SOC.
547 This option compiles in support for the CE4100 SOC for settop
548 boxes and media devices.
549
David Cohen4cb9b002013-12-16 17:37:26 -0800550config X86_INTEL_MID
Alan Cox43605ef2011-07-12 17:49:29 +0100551 bool "Intel MID platform support"
Alan Cox43605ef2011-07-12 17:49:29 +0100552 depends on X86_EXTENDED_PLATFORM
David Cohenedc6bc72014-01-21 10:41:39 -0800553 depends on X86_PLATFORM_DEVICES
Alan Cox1ea7c672011-11-10 13:29:14 +0000554 depends on PCI
Andy Shevchenko3fda5bb2016-01-15 22:11:07 +0200555 depends on X86_64 || (PCI_GOANY && X86_32)
Alan Cox1ea7c672011-11-10 13:29:14 +0000556 depends on X86_IO_APIC
Alan Cox7c9c3a12011-12-29 14:43:16 +0000557 select SFI
David Cohen4cb9b002013-12-16 17:37:26 -0800558 select I2C
Alan Cox7c9c3a12011-12-29 14:43:16 +0000559 select DW_APB_TIMER
Alan Cox1ea7c672011-11-10 13:29:14 +0000560 select APB_TIMER
Alan Cox1ea7c672011-11-10 13:29:14 +0000561 select INTEL_SCU_IPC
Mika Westerberg15a713d2012-01-26 17:35:05 +0000562 select MFD_INTEL_MSIC
Alan Cox1ea7c672011-11-10 13:29:14 +0000563 ---help---
David Cohen4cb9b002013-12-16 17:37:26 -0800564 Select to build a kernel capable of supporting Intel MID (Mobile
565 Internet Device) platform systems which do not have the PCI legacy
566 interfaces. If you are building for a PC class system say N here.
Alan Cox1ea7c672011-11-10 13:29:14 +0000567
David Cohen4cb9b002013-12-16 17:37:26 -0800568 Intel MID platforms are based on an Intel processor and chipset which
569 consume less power than most of the x86 derivatives.
Alan Cox43605ef2011-07-12 17:49:29 +0100570
Bryan O'Donoghue8bbc2a12015-01-30 16:29:39 +0000571config X86_INTEL_QUARK
572 bool "Intel Quark platform support"
573 depends on X86_32
574 depends on X86_EXTENDED_PLATFORM
575 depends on X86_PLATFORM_DEVICES
576 depends on X86_TSC
577 depends on PCI
578 depends on PCI_GOANY
579 depends on X86_IO_APIC
580 select IOSF_MBI
581 select INTEL_IMR
Andy Shevchenko9ab6eb52015-03-05 17:24:04 +0200582 select COMMON_CLK
Bryan O'Donoghue8bbc2a12015-01-30 16:29:39 +0000583 ---help---
584 Select to include support for Quark X1000 SoC.
585 Say Y here if you have a Quark based system such as the Arduino
586 compatible Intel Galileo.
587
Mika Westerberg3d48aab2013-01-18 13:45:59 +0000588config X86_INTEL_LPSS
589 bool "Intel Low Power Subsystem Support"
Andy Shevchenkoeebb3e82015-12-12 02:45:06 +0100590 depends on X86 && ACPI
Mika Westerberg3d48aab2013-01-18 13:45:59 +0000591 select COMMON_CLK
Mathias Nyman0f531432013-09-13 17:02:29 +0300592 select PINCTRL
Andy Shevchenkoeebb3e82015-12-12 02:45:06 +0100593 select IOSF_MBI
Mika Westerberg3d48aab2013-01-18 13:45:59 +0000594 ---help---
595 Select to build support for Intel Low Power Subsystem such as
596 found on Intel Lynxpoint PCH. Selecting this option enables
Mathias Nyman0f531432013-09-13 17:02:29 +0300597 things like clock tree (common clock framework) and pincontrol
598 which are needed by the LPSS peripheral drivers.
Mika Westerberg3d48aab2013-01-18 13:45:59 +0000599
Ken Xue92082a82015-02-06 08:27:51 +0800600config X86_AMD_PLATFORM_DEVICE
601 bool "AMD ACPI2Platform devices support"
602 depends on ACPI
603 select COMMON_CLK
604 select PINCTRL
605 ---help---
606 Select to interpret AMD specific ACPI device to platform device
607 such as I2C, UART, GPIO found on AMD Carrizo and later chipsets.
608 I2C and UART depend on COMMON_CLK to set clock. GPIO driver is
609 implemented under PINCTRL subsystem.
610
David E. Boxced3ce72014-09-17 22:13:50 -0700611config IOSF_MBI
612 tristate "Intel SoC IOSF Sideband support for SoC platforms"
613 depends on PCI
614 ---help---
615 This option enables sideband register access support for Intel SoC
616 platforms. On these platforms the IOSF sideband is used in lieu of
617 MSR's for some register accesses, mostly but not limited to thermal
618 and power. Drivers may query the availability of this device to
619 determine if they need the sideband in order to work on these
620 platforms. The sideband is available on the following SoC products.
621 This list is not meant to be exclusive.
622 - BayTrail
623 - Braswell
624 - Quark
625
626 You should say Y if you are running a kernel on one of these SoC's.
627
David E. Boxed2226b2014-09-17 22:13:51 -0700628config IOSF_MBI_DEBUG
629 bool "Enable IOSF sideband access through debugfs"
630 depends on IOSF_MBI && DEBUG_FS
631 ---help---
632 Select this option to expose the IOSF sideband access registers (MCR,
633 MDR, MCRX) through debugfs to write and read register information from
634 different units on the SoC. This is most useful for obtaining device
635 state information for debug and analysis. As this is a general access
636 mechanism, users of this option would have specific knowledge of the
637 device they want to access.
638
639 If you don't require the option or are in doubt, say N.
640
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800641config X86_RDC321X
642 bool "RDC R-321x SoC"
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100643 depends on X86_32
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800644 depends on X86_EXTENDED_PLATFORM
645 select M486
646 select X86_REBOOTFIXUPS
647 ---help---
648 This option is needed for RDC R-321x system-on-chip, also known
649 as R-8610-(G).
650 If you don't have one of these chips, you should say N here.
651
Ingo Molnare0c7ae32009-01-27 18:43:09 +0100652config X86_32_NON_STANDARD
Ingo Molnar9c398012009-01-27 18:24:57 +0100653 bool "Support non-standard 32-bit SMP architectures"
654 depends on X86_32 && SMP
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800655 depends on X86_EXTENDED_PLATFORM
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100656 ---help---
H. Peter Anvinb5660ba2014-02-25 12:14:06 -0800657 This option compiles in the bigsmp and STA2X11 default
658 subarchitectures. It is intended for a generic binary
659 kernel. If you select them all, kernel will probe it one by
660 one and will fallback to default.
Yinghai Lud49c4282008-06-08 18:31:54 -0700661
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800662# Alphabetically sorted list of Non standard 32 bit platforms
Yinghai Lud49c4282008-06-08 18:31:54 -0700663
Linus Torvaldsd949f362009-09-26 09:35:07 -0700664config X86_SUPPORTS_MEMORY_FAILURE
Jan Beulich6fc108a2010-04-21 15:23:44 +0100665 def_bool y
Linus Torvaldsd949f362009-09-26 09:35:07 -0700666 # MCE code calls memory_failure():
667 depends on X86_MCE
668 # On 32-bit this adds too big of NODES_SHIFT and we run out of page flags:
Linus Torvaldsd949f362009-09-26 09:35:07 -0700669 # On 32-bit SPARSEMEM adds too big of SECTIONS_WIDTH:
670 depends on X86_64 || !SPARSEMEM
671 select ARCH_SUPPORTS_MEMORY_FAILURE
Linus Torvaldsd949f362009-09-26 09:35:07 -0700672
Alessandro Rubini83125a32012-04-04 19:40:21 +0200673config STA2X11
674 bool "STA2X11 Companion Chip Support"
675 depends on X86_32_NON_STANDARD && PCI
676 select X86_DEV_DMA_OPS
677 select X86_DMA_REMAP
678 select SWIOTLB
679 select MFD_STA2X11
Linus Walleij01450712016-06-02 14:20:18 +0200680 select GPIOLIB
Alessandro Rubini83125a32012-04-04 19:40:21 +0200681 default n
682 ---help---
683 This adds support for boards based on the STA2X11 IO-Hub,
684 a.k.a. "ConneXt". The chip is used in place of the standard
685 PC chipset, so all "standard" peripherals are missing. If this
686 option is selected the kernel will still be able to boot on
687 standard PC machines.
688
Shérab82148d12010-09-25 06:06:57 +0200689config X86_32_IRIS
690 tristate "Eurobraille/Iris poweroff module"
691 depends on X86_32
692 ---help---
693 The Iris machines from EuroBraille do not have APM or ACPI support
694 to shut themselves down properly. A special I/O sequence is
695 needed to do so, which is what this module does at
696 kernel shutdown.
697
698 This is only for Iris machines from EuroBraille.
699
700 If unused, say N.
701
Ingo Molnarae1e9132008-11-11 09:05:16 +0100702config SCHED_OMIT_FRAME_POINTER
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100703 def_bool y
704 prompt "Single-depth WCHAN output"
Ken Chena87d0912008-11-06 11:10:49 -0800705 depends on X86
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100706 ---help---
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100707 Calculate simpler /proc/<PID>/wchan values. If this option
708 is disabled then wchan values will recurse back to the
709 caller function. This provides more accurate wchan values,
710 at the expense of slightly more scheduling overhead.
711
712 If in doubt, say "Y".
713
Borislav Petkov6276a072013-03-04 21:20:21 +0100714menuconfig HYPERVISOR_GUEST
715 bool "Linux guest support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100716 ---help---
Borislav Petkov6276a072013-03-04 21:20:21 +0100717 Say Y here to enable options for running Linux under various hyper-
718 visors. This option enables basic hypervisor detection and platform
719 setup.
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100720
Borislav Petkov6276a072013-03-04 21:20:21 +0100721 If you say N, all options in this submenu will be skipped and
722 disabled, and Linux guest support won't be built in.
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100723
Borislav Petkov6276a072013-03-04 21:20:21 +0100724if HYPERVISOR_GUEST
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100725
Eduardo Pereira Habkoste61bd942008-01-30 13:33:32 +0100726config PARAVIRT
727 bool "Enable paravirtualization code"
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100728 ---help---
Eduardo Pereira Habkoste61bd942008-01-30 13:33:32 +0100729 This changes the kernel so it can modify itself when it is run
730 under a hypervisor, potentially improving performance significantly
731 over full virtualization. However, when run without a hypervisor
732 the kernel is theoretically slower and slightly larger.
733
Borislav Petkov6276a072013-03-04 21:20:21 +0100734config PARAVIRT_DEBUG
735 bool "paravirt-ops debugging"
736 depends on PARAVIRT && DEBUG_KERNEL
737 ---help---
738 Enable to debug paravirt_ops internals. Specifically, BUG if
739 a paravirt_op is missing when it is called.
740
Jeremy Fitzhardingeb4ecc122009-05-13 17:16:55 -0700741config PARAVIRT_SPINLOCKS
742 bool "Paravirtualization layer for spinlocks"
Kees Cook6ea30382012-10-02 11:16:47 -0700743 depends on PARAVIRT && SMP
Jeremy Fitzhardingeb4ecc122009-05-13 17:16:55 -0700744 ---help---
745 Paravirtualized spinlocks allow a pvops backend to replace the
746 spinlock implementation with something virtualization-friendly
747 (for example, block the virtual CPU rather than spinning).
748
Raghavendra K T4c4e4f62013-10-21 21:35:08 +0530749 It has a minimal impact on native kernels and gives a nice performance
750 benefit on paravirtualized KVM / Xen kernels.
Jeremy Fitzhardingeb4ecc122009-05-13 17:16:55 -0700751
Raghavendra K T4c4e4f62013-10-21 21:35:08 +0530752 If you are unsure how to answer this question, answer Y.
Jeremy Fitzhardingeb4ecc122009-05-13 17:16:55 -0700753
Waiman Long45e898b2015-11-09 19:09:25 -0500754config QUEUED_LOCK_STAT
755 bool "Paravirt queued spinlock statistics"
Peter Zijlstracfd89832016-05-18 20:43:02 +0200756 depends on PARAVIRT_SPINLOCKS && DEBUG_FS
Waiman Long45e898b2015-11-09 19:09:25 -0500757 ---help---
758 Enable the collection of statistical data on the slowpath
759 behavior of paravirtualized queued spinlocks and report
760 them on debugfs.
761
Borislav Petkov6276a072013-03-04 21:20:21 +0100762source "arch/x86/xen/Kconfig"
763
764config KVM_GUEST
765 bool "KVM Guest support (including kvmclock)"
766 depends on PARAVIRT
767 select PARAVIRT_CLOCK
768 default y
769 ---help---
770 This option enables various optimizations for running under the KVM
771 hypervisor. It includes a paravirtualized clock, so that instead
772 of relying on a PIT (or probably other) emulation by the
773 underlying device model, the host provides the guest with
774 timing infrastructure such as time of day, and system time
775
Srivatsa Vaddagiri1e20eb82013-08-09 19:52:01 +0530776config KVM_DEBUG_FS
777 bool "Enable debug information for KVM Guests in debugfs"
778 depends on KVM_GUEST && DEBUG_FS
779 default n
780 ---help---
781 This option enables collection of various statistics for KVM guest.
782 Statistics are displayed in debugfs filesystem. Enabling this option
783 may incur significant overhead.
784
Borislav Petkov6276a072013-03-04 21:20:21 +0100785config PARAVIRT_TIME_ACCOUNTING
786 bool "Paravirtual steal time accounting"
787 depends on PARAVIRT
788 default n
789 ---help---
790 Select this option to enable fine granularity task steal time
791 accounting. Time spent executing other tasks in parallel with
792 the current vCPU is discounted from the vCPU power. To account for
793 that, there can be a small performance impact.
794
795 If in doubt, say N here.
796
Gerd Hoffmann7af192c2008-06-03 16:17:29 +0200797config PARAVIRT_CLOCK
798 bool
Gerd Hoffmann7af192c2008-06-03 16:17:29 +0200799
Borislav Petkov6276a072013-03-04 21:20:21 +0100800endif #HYPERVISOR_GUEST
Jeremy Fitzhardinge97349132008-06-25 00:19:14 -0400801
Yinghai Lu08677212010-02-10 01:20:20 -0800802config NO_BOOTMEM
Yinghai Lu774ea0b2010-08-25 13:39:18 -0700803 def_bool y
Yinghai Lu08677212010-02-10 01:20:20 -0800804
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100805source "arch/x86/Kconfig.cpu"
806
807config HPET_TIMER
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100808 def_bool X86_64
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100809 prompt "HPET Timer Support" if X86_32
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100810 ---help---
811 Use the IA-PC HPET (High Precision Event Timer) to manage
812 time in preference to the PIT and RTC, if a HPET is
813 present.
814 HPET is the next generation timer replacing legacy 8254s.
815 The HPET provides a stable time base on SMP
816 systems, unlike the TSC, but it is more expensive to access,
Michael S. Tsirkin4e7f9df2016-02-11 01:05:01 +0200817 as it is off-chip. The interface used is documented
818 in the HPET spec, revision 1.
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100819
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100820 You can safely choose Y here. However, HPET will only be
821 activated if the platform and the BIOS support this feature.
822 Otherwise the 8254 will be used for timing services.
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100823
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100824 Choose N to continue using the legacy 8254 timer.
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100825
826config HPET_EMULATE_RTC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100827 def_bool y
Bernhard Walle9d8af782008-02-06 01:38:52 -0800828 depends on HPET_TIMER && (RTC=y || RTC=m || RTC_DRV_CMOS=m || RTC_DRV_CMOS=y)
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100829
Jacob Panbb24c472009-09-02 07:37:17 -0700830config APB_TIMER
Alan Cox933b9462011-12-17 17:43:40 +0000831 def_bool y if X86_INTEL_MID
832 prompt "Intel MID APB Timer Support" if X86_INTEL_MID
Jamie Iles06c3df42011-06-06 12:43:07 +0100833 select DW_APB_TIMER
Alan Coxa0c38322011-12-17 21:57:25 +0000834 depends on X86_INTEL_MID && SFI
Jacob Panbb24c472009-09-02 07:37:17 -0700835 help
836 APB timer is the replacement for 8254, HPET on X86 MID platforms.
837 The APBT provides a stable time base on SMP
838 systems, unlike the TSC, but it is more expensive to access,
839 as it is off-chip. APB timers are always running regardless of CPU
840 C states, they are used as per CPU clockevent device when possible.
841
David Rientjes6a108a12011-01-20 14:44:16 -0800842# Mark as expert because too many people got it wrong.
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100843# The code disables itself when not needed.
Thomas Petazzoni7ae93922008-04-28 02:14:14 -0700844config DMI
845 default y
Ard Biesheuvelcf074402014-01-23 15:54:39 -0800846 select DMI_SCAN_MACHINE_NON_EFI_FALLBACK
David Rientjes6a108a12011-01-20 14:44:16 -0800847 bool "Enable DMI scanning" if EXPERT
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100848 ---help---
Thomas Petazzoni7ae93922008-04-28 02:14:14 -0700849 Enabled scanning of DMI to identify machine quirks. Say Y
850 here unless you have verified that your setup is not
851 affected by entries in the DMI blacklist. Required by PNP
852 BIOS code.
853
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100854config GART_IOMMU
Andi Kleen38901f12013-10-04 14:37:56 -0700855 bool "Old AMD GART IOMMU support"
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100856 select SWIOTLB
Andreas Herrmann23ac4ae2010-09-17 18:03:43 +0200857 depends on X86_64 && PCI && AMD_NB
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100858 ---help---
Ingo Molnarced3c422013-10-06 11:45:20 +0200859 Provides a driver for older AMD Athlon64/Opteron/Turion/Sempron
860 GART based hardware IOMMUs.
861
862 The GART supports full DMA access for devices with 32-bit access
863 limitations, on systems with more than 3 GB. This is usually needed
864 for USB, sound, many IDE/SATA chipsets and some other devices.
865
866 Newer systems typically have a modern AMD IOMMU, supported via
867 the CONFIG_AMD_IOMMU=y config option.
868
869 In normal configurations this driver is only active when needed:
870 there's more than 3 GB of memory and the system contains a
871 32-bit limited device.
872
873 If unsure, say Y.
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100874
875config CALGARY_IOMMU
876 bool "IBM Calgary IOMMU support"
877 select SWIOTLB
Kees Cook6ea30382012-10-02 11:16:47 -0700878 depends on X86_64 && PCI
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100879 ---help---
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100880 Support for hardware IOMMUs in IBM's xSeries x366 and x460
881 systems. Needed to run systems with more than 3GB of memory
882 properly with 32-bit PCI devices that do not support DAC
883 (Double Address Cycle). Calgary also supports bus level
884 isolation, where all DMAs pass through the IOMMU. This
885 prevents them from going anywhere except their intended
886 destination. This catches hard-to-find kernel bugs and
887 mis-behaving drivers and devices that do not use the DMA-API
888 properly to set up their DMA buffers. The IOMMU can be
889 turned off at boot time with the iommu=off parameter.
890 Normally the kernel will make the right choice by itself.
891 If unsure, say Y.
892
893config CALGARY_IOMMU_ENABLED_BY_DEFAULT
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100894 def_bool y
895 prompt "Should Calgary be enabled by default?"
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100896 depends on CALGARY_IOMMU
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100897 ---help---
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100898 Should Calgary be enabled by default? if you choose 'y', Calgary
899 will be used (if it exists). If you choose 'n', Calgary will not be
900 used even if it exists. If you choose 'n' and would like to use
901 Calgary anyway, pass 'iommu=calgary' on the kernel command line.
902 If unsure, say Y.
903
904# need this always selected by IOMMU for the VIA workaround
905config SWIOTLB
Joerg Roedela1afd012008-11-18 12:44:21 +0100906 def_bool y if X86_64
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100907 ---help---
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100908 Support for software bounce buffers used on x86-64 systems
Joe Millenbach4454d322012-09-02 17:38:20 -0700909 which don't have a hardware IOMMU. Using this PCI devices
910 which can only access 32-bits of memory can be used on systems
911 with more than 3 GB of memory.
912 If unsure, say Y.
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100913
FUJITA Tomonoria8522502008-04-29 00:59:36 -0700914config IOMMU_HELPER
Jan Beulich3120e252012-09-10 12:41:45 +0100915 def_bool y
916 depends on CALGARY_IOMMU || GART_IOMMU || SWIOTLB || AMD_IOMMU
Linus Torvaldsd25e26b2008-08-25 14:15:38 -0700917
Mike Travis1184dc22008-05-12 21:21:12 +0200918config MAXSMP
Samuel Thibaultddb0c5a2010-08-21 21:32:41 +0200919 bool "Enable Maximum number of SMP Processors and NUMA Nodes"
Kees Cook6ea30382012-10-02 11:16:47 -0700920 depends on X86_64 && SMP && DEBUG_KERNEL
Mike Travis36f51012008-12-16 17:33:51 -0800921 select CPUMASK_OFFSTACK
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100922 ---help---
Samuel Thibaultddb0c5a2010-08-21 21:32:41 +0200923 Enable maximum number of CPUS and NUMA Nodes for this architecture.
Mike Travis1184dc22008-05-12 21:21:12 +0200924 If unsure, say N.
Sam Ravnborg506f1d072007-11-09 21:56:54 +0100925
926config NR_CPUS
Mike Travis36f51012008-12-16 17:33:51 -0800927 int "Maximum number of CPUs" if SMP && !MAXSMP
Michael K. Johnson2a3313f2009-04-21 21:44:48 -0400928 range 2 8 if SMP && X86_32 && !X86_BIGSMP
Thomas Gleixner7bbcbd32017-12-20 18:02:34 +0100929 range 2 64 if SMP && X86_32 && X86_BIGSMP
930 range 2 512 if SMP && !MAXSMP && !CPUMASK_OFFSTACK && X86_64
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
1433 depends on X86_64 && !DEBUG_PAGEALLOC && !KMEMCHECK
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
Dave Hansen72e9b5f2014-12-12 10:38:36 -08001807config X86_INTEL_MPX
1808 prompt "Intel MPX (Memory Protection Extensions)"
1809 def_bool n
Rik van Rieldf3735c2017-09-06 16:25:11 -07001810 # Note: only available in 64-bit mode due to VMA flags shortage
1811 depends on CPU_SUP_INTEL && X86_64
1812 select ARCH_USES_HIGH_VMA_FLAGS
Dave Hansen72e9b5f2014-12-12 10:38:36 -08001813 ---help---
1814 MPX provides hardware features that can be used in
1815 conjunction with compiler-instrumented code to check
1816 memory references. It is designed to detect buffer
1817 overflow or underflow bugs.
1818
1819 This option enables running applications which are
1820 instrumented or otherwise use MPX. It does not use MPX
1821 itself inside the kernel or to protect the kernel
1822 against bad memory references.
1823
1824 Enabling this option will make the kernel larger:
1825 ~8k of kernel text and 36 bytes of data on a 64-bit
1826 defconfig. It adds a long to the 'mm_struct' which
1827 will increase the kernel memory overhead of each
1828 process and adds some branches to paths used during
1829 exec() and munmap().
1830
1831 For details, see Documentation/x86/intel_mpx.txt
1832
1833 If unsure, say N.
1834
Dave Hansen35e97792016-02-12 13:02:00 -08001835config X86_INTEL_MEMORY_PROTECTION_KEYS
Dave Hansen284244a2016-02-12 13:02:28 -08001836 prompt "Intel Memory Protection Keys"
Dave Hansen35e97792016-02-12 13:02:00 -08001837 def_bool y
Dave Hansen284244a2016-02-12 13:02:28 -08001838 # Note: only available in 64-bit mode
Dave Hansen35e97792016-02-12 13:02:00 -08001839 depends on CPU_SUP_INTEL && X86_64
Ingo Molnar52c8e602016-11-15 10:15:03 +01001840 select ARCH_USES_HIGH_VMA_FLAGS
1841 select ARCH_HAS_PKEYS
Dave Hansen284244a2016-02-12 13:02:28 -08001842 ---help---
1843 Memory Protection Keys provides a mechanism for enforcing
1844 page-based protections, but without requiring modification of the
1845 page tables when an application changes protection domains.
1846
1847 For details, see Documentation/x86/protection-keys.txt
1848
1849 If unsure, say y.
Dave Hansen35e97792016-02-12 13:02:00 -08001850
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001851config EFI
Jan Beulich9ba16082008-10-15 22:01:38 -07001852 bool "EFI runtime service support"
Huang, Ying5b836832008-01-30 13:31:19 +01001853 depends on ACPI
Sergey Vlasovf6ce5002013-04-16 18:31:08 +04001854 select UCS2_STRING
Ard Biesheuvel022ee6c2014-06-26 12:09:05 +02001855 select EFI_RUNTIME_WRAPPERS
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001856 ---help---
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001857 This enables the kernel to use EFI runtime services that are
1858 available (such as the EFI variable services).
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001859
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001860 This option is only useful on systems that have EFI firmware.
1861 In addition, you should use the latest ELILO loader available
1862 at <http://elilo.sourceforge.net> in order to take advantage
1863 of EFI runtime services. However, even with this option, the
1864 resultant kernel should continue to boot on existing non-EFI
1865 platforms.
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001866
Matt Fleming291f3632011-12-12 21:27:52 +00001867config EFI_STUB
1868 bool "EFI stub support"
Matt Flemingb16d8c22014-08-05 00:12:19 +01001869 depends on EFI && !X86_USE_3DNOW
Matt Fleming7b2a5832014-07-11 08:45:25 +01001870 select RELOCATABLE
Matt Fleming291f3632011-12-12 21:27:52 +00001871 ---help---
1872 This kernel feature allows a bzImage to be loaded directly
1873 by EFI firmware without the use of a bootloader.
1874
Roy Franz4172fe22013-09-22 15:45:25 -07001875 See Documentation/efi-stub.txt for more information.
Matt Fleming0c759662012-03-16 12:03:13 +00001876
Matt Fleming7d453ee2014-01-10 18:52:06 +00001877config EFI_MIXED
1878 bool "EFI mixed-mode support"
1879 depends on EFI_STUB && X86_64
1880 ---help---
1881 Enabling this feature allows a 64-bit kernel to be booted
1882 on a 32-bit firmware, provided that your CPU supports 64-bit
1883 mode.
1884
1885 Note that it is not possible to boot a mixed-mode enabled
1886 kernel via the EFI boot stub - a bootloader that supports
1887 the EFI handover protocol must be used.
1888
1889 If unsure, say N.
1890
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001891config SECCOMP
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001892 def_bool y
1893 prompt "Enable seccomp to safely compute untrusted bytecode"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001894 ---help---
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001895 This kernel feature is useful for number crunching applications
1896 that may need to compute untrusted bytecode during their
1897 execution. By using pipes or other transports made available to
1898 the process as file descriptors supporting the read/write
1899 syscalls, it's possible to isolate those applications in
1900 their own address space using seccomp. Once seccomp is
Alexey Dobriyan9c0bbee2008-09-09 11:01:31 +04001901 enabled via prctl(PR_SET_SECCOMP), it cannot be disabled
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001902 and the task is only allowed to execute a few safe syscalls
1903 defined by each seccomp mode.
1904
1905 If unsure, say Y. Only embedded should say N here.
1906
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001907source kernel/Kconfig.hz
1908
1909config KEXEC
1910 bool "kexec system call"
Dave Young2965faa2015-09-09 15:38:55 -07001911 select KEXEC_CORE
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001912 ---help---
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001913 kexec is a system call that implements the ability to shutdown your
1914 current kernel, and to start another kernel. It is like a reboot
1915 but it is independent of the system firmware. And like a reboot
1916 you can start any kernel with it, not just Linux.
1917
1918 The name comes from the similarity to the exec system call.
1919
1920 It is an ongoing process to be certain the hardware in a machine
1921 is properly shutdown, so do not be surprised if this code does not
Geert Uytterhoevenbf220692013-08-20 21:38:03 +02001922 initially work for you. As of this writing the exact hardware
1923 interface is strongly in flux, so no good recommendation can be
1924 made.
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001925
Vivek Goyal74ca3172014-08-29 15:18:46 -07001926config KEXEC_FILE
1927 bool "kexec file based system call"
Dave Young2965faa2015-09-09 15:38:55 -07001928 select KEXEC_CORE
Vivek Goyal74ca3172014-08-29 15:18:46 -07001929 select BUILD_BIN2C
Vivek Goyal74ca3172014-08-29 15:18:46 -07001930 depends on X86_64
1931 depends on CRYPTO=y
1932 depends on CRYPTO_SHA256=y
1933 ---help---
1934 This is new version of kexec system call. This system call is
1935 file based and takes file descriptors as system call argument
1936 for kernel and initramfs as opposed to list of segments as
1937 accepted by previous system call.
1938
Vivek Goyal8e7d8382014-08-08 14:26:13 -07001939config KEXEC_VERIFY_SIG
1940 bool "Verify kernel signature during kexec_file_load() syscall"
Vivek Goyal74ca3172014-08-29 15:18:46 -07001941 depends on KEXEC_FILE
Vivek Goyal8e7d8382014-08-08 14:26:13 -07001942 ---help---
1943 This option makes kernel signature verification mandatory for
Borislav Petkovd8eb8942015-03-13 14:04:37 +01001944 the kexec_file_load() syscall.
Vivek Goyal8e7d8382014-08-08 14:26:13 -07001945
Borislav Petkovd8eb8942015-03-13 14:04:37 +01001946 In addition to that option, you need to enable signature
1947 verification for the corresponding kernel image type being
1948 loaded in order for this to work.
Vivek Goyal8e7d8382014-08-08 14:26:13 -07001949
1950config KEXEC_BZIMAGE_VERIFY_SIG
1951 bool "Enable bzImage signature verification support"
1952 depends on KEXEC_VERIFY_SIG
1953 depends on SIGNED_PE_FILE_VERIFICATION
1954 select SYSTEM_TRUSTED_KEYRING
1955 ---help---
1956 Enable bzImage signature verification support.
1957
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001958config CRASH_DUMP
Pavel Machek04b69442008-08-14 17:16:50 +02001959 bool "kernel crash dumps"
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001960 depends on X86_64 || (X86_32 && HIGHMEM)
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001961 ---help---
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001962 Generate crash dump after being started by kexec.
1963 This should be normally only set in special crash dump kernels
1964 which are loaded in the main kernel with kexec-tools into
1965 a specially reserved region and then later executed after
1966 a crash by kdump/kexec. The crash dump kernel must be compiled
1967 to a memory address not used by the main kernel or BIOS using
1968 PHYSICAL_START, or it must be built as a relocatable image
1969 (CONFIG_RELOCATABLE=y).
1970 For more details see Documentation/kdump/kdump.txt
1971
Huang Ying3ab83522008-07-25 19:45:07 -07001972config KEXEC_JUMP
Kees Cook6ea30382012-10-02 11:16:47 -07001973 bool "kexec jump"
Huang Yingfee7b0d2009-03-10 10:57:16 +08001974 depends on KEXEC && HIBERNATION
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001975 ---help---
Huang Ying89081d12008-07-25 19:45:10 -07001976 Jump between original kernel and kexeced kernel and invoke
1977 code in physical address mode via KEXEC
Huang Ying3ab83522008-07-25 19:45:07 -07001978
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001979config PHYSICAL_START
David Rientjes6a108a12011-01-20 14:44:16 -08001980 hex "Physical address where the kernel is loaded" if (EXPERT || CRASH_DUMP)
H. Peter Anvinceefccc2009-05-11 16:12:16 -07001981 default "0x1000000"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001982 ---help---
Sam Ravnborg506f1d072007-11-09 21:56:54 +01001983 This gives the physical address where the kernel is loaded.
1984
1985 If kernel is a not relocatable (CONFIG_RELOCATABLE=n) then
1986 bzImage will decompress itself to above physical address and
1987 run from there. Otherwise, bzImage will run from the address where
1988 it has been loaded by the boot loader and will ignore above physical
1989 address.
1990
1991 In normal kdump cases one does not have to set/change this option
1992 as now bzImage can be compiled as a completely relocatable image
1993 (CONFIG_RELOCATABLE=y) and be used to load and run from a different
1994 address. This option is mainly useful for the folks who don't want
1995 to use a bzImage for capturing the crash dump and want to use a
1996 vmlinux instead. vmlinux is not relocatable hence a kernel needs
1997 to be specifically compiled to run from a specific memory area
1998 (normally a reserved region) and this option comes handy.
1999
H. Peter Anvinceefccc2009-05-11 16:12:16 -07002000 So if you are using bzImage for capturing the crash dump,
2001 leave the value here unchanged to 0x1000000 and set
2002 CONFIG_RELOCATABLE=y. Otherwise if you plan to use vmlinux
2003 for capturing the crash dump change this value to start of
2004 the reserved region. In other words, it can be set based on
2005 the "X" value as specified in the "crashkernel=YM@XM"
2006 command line boot parameter passed to the panic-ed
2007 kernel. Please take a look at Documentation/kdump/kdump.txt
2008 for more details about crash dumps.
Sam Ravnborg506f1d072007-11-09 21:56:54 +01002009
2010 Usage of bzImage for capturing the crash dump is recommended as
2011 one does not have to build two kernels. Same kernel can be used
2012 as production kernel and capture kernel. Above option should have
2013 gone away after relocatable bzImage support is introduced. But it
2014 is present because there are users out there who continue to use
2015 vmlinux for dump capture. This option should go away down the
2016 line.
2017
2018 Don't change this unless you know what you are doing.
2019
2020config RELOCATABLE
H. Peter Anvin26717802009-05-07 14:19:34 -07002021 bool "Build a relocatable kernel"
2022 default y
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002023 ---help---
Sam Ravnborg506f1d072007-11-09 21:56:54 +01002024 This builds a kernel image that retains relocation information
2025 so it can be loaded someplace besides the default 1MB.
2026 The relocations tend to make the kernel binary about 10% larger,
2027 but are discarded at runtime.
2028
2029 One use is for the kexec on panic case where the recovery kernel
2030 must live at a different physical address than the primary
2031 kernel.
2032
2033 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
2034 it has been loaded at and the compile time physical address
Kees Cook8ab38202013-10-10 17:18:14 -07002035 (CONFIG_PHYSICAL_START) is used as the minimum location.
Sam Ravnborg506f1d072007-11-09 21:56:54 +01002036
Kees Cook8ab38202013-10-10 17:18:14 -07002037config RANDOMIZE_BASE
Baoquan Hee8581e32016-04-20 13:55:43 -07002038 bool "Randomize the address of the kernel image (KASLR)"
Kees Cook8ab38202013-10-10 17:18:14 -07002039 depends on RELOCATABLE
Ingo Molnar6807c842017-04-18 11:08:12 +02002040 default y
Kees Cook8ab38202013-10-10 17:18:14 -07002041 ---help---
Baoquan Hee8581e32016-04-20 13:55:43 -07002042 In support of Kernel Address Space Layout Randomization (KASLR),
2043 this randomizes the physical address at which the kernel image
2044 is decompressed and the virtual address where the kernel
2045 image is mapped, as a security feature that deters exploit
2046 attempts relying on knowledge of the location of kernel
2047 code internals.
Kees Cook8ab38202013-10-10 17:18:14 -07002048
Kees Cooked9f0072016-05-25 15:45:33 -07002049 On 64-bit, the kernel physical and virtual addresses are
2050 randomized separately. The physical address will be anywhere
2051 between 16MB and the top of physical memory (up to 64TB). The
2052 virtual address will be randomized from 16MB up to 1GB (9 bits
2053 of entropy). Note that this also reduces the memory space
2054 available to kernel modules from 1.5GB to 1GB.
2055
2056 On 32-bit, the kernel physical and virtual addresses are
2057 randomized together. They will be randomized from 16MB up to
2058 512MB (8 bits of entropy).
Kees Cook8ab38202013-10-10 17:18:14 -07002059
Baoquan Hee8581e32016-04-20 13:55:43 -07002060 Entropy is generated using the RDRAND instruction if it is
2061 supported. If RDTSC is supported, its value is mixed into
2062 the entropy pool as well. If neither RDRAND nor RDTSC are
Kees Cooked9f0072016-05-25 15:45:33 -07002063 supported, then entropy is read from the i8254 timer. The
2064 usable entropy is limited by the kernel being built using
2065 2GB addressing, and that PHYSICAL_ALIGN must be at a
2066 minimum of 2MB. As a result, only 10 bits of entropy are
2067 theoretically possible, but the implementations are further
2068 limited due to memory layouts.
Kees Cookda2b6fb2013-12-10 12:27:45 -08002069
Ingo Molnar6807c842017-04-18 11:08:12 +02002070 If unsure, say Y.
Kees Cook8ab38202013-10-10 17:18:14 -07002071
2072# Relocation on x86 needs some additional build support
H. Peter Anvin845adf72009-05-05 21:20:51 -07002073config X86_NEED_RELOCS
2074 def_bool y
Kees Cook8ab38202013-10-10 17:18:14 -07002075 depends on RANDOMIZE_BASE || (X86_32 && RELOCATABLE)
H. Peter Anvin845adf72009-05-05 21:20:51 -07002076
Sam Ravnborg506f1d072007-11-09 21:56:54 +01002077config PHYSICAL_ALIGN
Kees Cooka0215062013-07-08 09:15:17 -07002078 hex "Alignment value to which kernel should be aligned"
Kees Cook8ab38202013-10-10 17:18:14 -07002079 default "0x200000"
Kees Cooka0215062013-07-08 09:15:17 -07002080 range 0x2000 0x1000000 if X86_32
2081 range 0x200000 0x1000000 if X86_64
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002082 ---help---
Sam Ravnborg506f1d072007-11-09 21:56:54 +01002083 This value puts the alignment restrictions on physical address
2084 where kernel is loaded and run from. Kernel is compiled for an
2085 address which meets above alignment restriction.
2086
2087 If bootloader loads the kernel at a non-aligned address and
2088 CONFIG_RELOCATABLE is set, kernel will move itself to nearest
2089 address aligned to above value and run from there.
2090
2091 If bootloader loads the kernel at a non-aligned address and
2092 CONFIG_RELOCATABLE is not set, kernel will ignore the run time
2093 load address and decompress itself to the address it has been
2094 compiled for and run from there. The address for which kernel is
2095 compiled already meets above alignment restrictions. Hence the
2096 end result is that kernel runs from a physical address meeting
2097 above alignment restrictions.
2098
Kees Cooka0215062013-07-08 09:15:17 -07002099 On 32-bit this value must be a multiple of 0x2000. On 64-bit
2100 this value must be a multiple of 0x200000.
2101
Sam Ravnborg506f1d072007-11-09 21:56:54 +01002102 Don't change this unless you know what you are doing.
2103
Thomas Garnier0483e1f2016-06-21 17:47:02 -07002104config RANDOMIZE_MEMORY
2105 bool "Randomize the kernel memory sections"
2106 depends on X86_64
2107 depends on RANDOMIZE_BASE
2108 default RANDOMIZE_BASE
2109 ---help---
2110 Randomizes the base virtual address of kernel memory sections
2111 (physical memory mapping, vmalloc & vmemmap). This security feature
2112 makes exploits relying on predictable memory locations less reliable.
2113
2114 The order of allocations remains unchanged. Entropy is generated in
2115 the same way as RANDOMIZE_BASE. Current implementation in the optimal
2116 configuration have in average 30,000 different possible virtual
2117 addresses for each memory section.
2118
Ingo Molnar6807c842017-04-18 11:08:12 +02002119 If unsure, say Y.
Thomas Garnier0483e1f2016-06-21 17:47:02 -07002120
Thomas Garnier90397a42016-06-21 17:47:06 -07002121config RANDOMIZE_MEMORY_PHYSICAL_PADDING
2122 hex "Physical memory mapping padding" if EXPERT
2123 depends on RANDOMIZE_MEMORY
2124 default "0xa" if MEMORY_HOTPLUG
2125 default "0x0"
2126 range 0x1 0x40 if MEMORY_HOTPLUG
2127 range 0x0 0x40
2128 ---help---
2129 Define the padding in terabytes added to the existing physical
2130 memory size during kernel memory randomization. It is useful
2131 for memory hotplug support but reduces the entropy available for
2132 address randomization.
2133
2134 If unsure, leave at the default value.
2135
Sam Ravnborg506f1d072007-11-09 21:56:54 +01002136config HOTPLUG_CPU
Dimitri Sivanich7c13e6a2008-08-11 10:46:46 -05002137 bool "Support for hot-pluggable CPUs"
Stephen Rothwell40b31362013-05-21 13:49:35 +10002138 depends on SMP
Sam Ravnborg506f1d072007-11-09 21:56:54 +01002139 ---help---
Dimitri Sivanich7c13e6a2008-08-11 10:46:46 -05002140 Say Y here to allow turning CPUs off and on. CPUs can be
2141 controlled through /sys/devices/system/cpu.
2142 ( Note: power management support will enable this option
2143 automatically on SMP systems. )
2144 Say N if you want to disable CPU hotplug.
Sam Ravnborg506f1d072007-11-09 21:56:54 +01002145
Fenghua Yu80aa1df2012-11-13 11:32:39 -08002146config BOOTPARAM_HOTPLUG_CPU0
2147 bool "Set default setting of cpu0_hotpluggable"
2148 default n
Kees Cook2c922cd2013-01-22 13:01:19 -08002149 depends on HOTPLUG_CPU
Fenghua Yu80aa1df2012-11-13 11:32:39 -08002150 ---help---
2151 Set whether default state of cpu0_hotpluggable is on or off.
2152
2153 Say Y here to enable CPU0 hotplug by default. If this switch
2154 is turned on, there is no need to give cpu0_hotplug kernel
2155 parameter and the CPU0 hotplug feature is enabled by default.
2156
2157 Please note: there are two known CPU0 dependencies if you want
2158 to enable the CPU0 hotplug feature either by this switch or by
2159 cpu0_hotplug kernel parameter.
2160
2161 First, resume from hibernate or suspend always starts from CPU0.
2162 So hibernate and suspend are prevented if CPU0 is offline.
2163
2164 Second dependency is PIC interrupts always go to CPU0. CPU0 can not
2165 offline if any interrupt can not migrate out of CPU0. There may
2166 be other CPU0 dependencies.
2167
2168 Please make sure the dependencies are under your control before
2169 you enable this feature.
2170
2171 Say N if you don't want to enable CPU0 hotplug feature by default.
2172 You still can enable the CPU0 hotplug feature at boot by kernel
2173 parameter cpu0_hotplug.
2174
Fenghua Yua71c8bc2012-11-13 11:32:51 -08002175config DEBUG_HOTPLUG_CPU0
2176 def_bool n
2177 prompt "Debug CPU0 hotplug"
Kees Cook2c922cd2013-01-22 13:01:19 -08002178 depends on HOTPLUG_CPU
Fenghua Yua71c8bc2012-11-13 11:32:51 -08002179 ---help---
2180 Enabling this option offlines CPU0 (if CPU0 can be offlined) as
2181 soon as possible and boots up userspace with CPU0 offlined. User
2182 can online CPU0 back after boot time.
2183
2184 To debug CPU0 hotplug, you need to enable CPU0 offline/online
2185 feature by either turning on CONFIG_BOOTPARAM_HOTPLUG_CPU0 during
2186 compilation or giving cpu0_hotplug kernel parameter at boot.
2187
2188 If unsure, say N.
2189
Sam Ravnborg506f1d072007-11-09 21:56:54 +01002190config COMPAT_VDSO
Andy Lutomirskib0b49f22014-03-13 16:01:26 -07002191 def_bool n
2192 prompt "Disable the 32-bit vDSO (needed for glibc 2.3.3)"
Ingo Molnar953fee12016-11-15 10:22:52 +01002193 depends on COMPAT_32
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002194 ---help---
Andy Lutomirskib0b49f22014-03-13 16:01:26 -07002195 Certain buggy versions of glibc will crash if they are
2196 presented with a 32-bit vDSO that is not mapped at the address
2197 indicated in its segment table.
Randy Dunlape84446d2009-11-10 15:46:52 -08002198
Andy Lutomirskib0b49f22014-03-13 16:01:26 -07002199 The bug was introduced by f866314b89d56845f55e6f365e18b31ec978ec3a
2200 and fixed by 3b3ddb4f7db98ec9e912ccdf54d35df4aa30e04a and
2201 49ad572a70b8aeb91e57483a11dd1b77e31c4468. Glibc 2.3.3 is
2202 the only released version with the bug, but OpenSUSE 9
2203 contains a buggy "glibc 2.3.2".
Sam Ravnborg506f1d072007-11-09 21:56:54 +01002204
Andy Lutomirskib0b49f22014-03-13 16:01:26 -07002205 The symptom of the bug is that everything crashes on startup, saying:
2206 dl_main: Assertion `(void *) ph->p_vaddr == _rtld_local._dl_sysinfo_dso' failed!
2207
2208 Saying Y here changes the default value of the vdso32 boot
2209 option from 1 to 0, which turns off the 32-bit vDSO entirely.
2210 This works around the glibc bug but hurts performance.
2211
2212 If unsure, say N: if you are compiling your own kernel, you
2213 are unlikely to be using a buggy version of glibc.
Sam Ravnborg506f1d072007-11-09 21:56:54 +01002214
Kees Cook3dc33bd2015-08-12 17:55:19 -07002215choice
2216 prompt "vsyscall table for legacy applications"
2217 depends on X86_64
2218 default LEGACY_VSYSCALL_EMULATE
2219 help
2220 Legacy user code that does not know how to find the vDSO expects
2221 to be able to issue three syscalls by calling fixed addresses in
2222 kernel space. Since this location is not randomized with ASLR,
2223 it can be used to assist security vulnerability exploitation.
2224
2225 This setting can be changed at boot time via the kernel command
2226 line parameter vsyscall=[native|emulate|none].
2227
2228 On a system with recent enough glibc (2.14 or newer) and no
2229 static binaries, you can say None without a performance penalty
2230 to improve security.
2231
2232 If unsure, select "Emulate".
2233
2234 config LEGACY_VSYSCALL_NATIVE
2235 bool "Native"
2236 help
2237 Actual executable code is located in the fixed vsyscall
2238 address mapping, implementing time() efficiently. Since
2239 this makes the mapping executable, it can be used during
2240 security vulnerability exploitation (traditionally as
2241 ROP gadgets). This configuration is not recommended.
2242
2243 config LEGACY_VSYSCALL_EMULATE
2244 bool "Emulate"
2245 help
2246 The kernel traps and emulates calls into the fixed
2247 vsyscall address mapping. This makes the mapping
2248 non-executable, but it still contains known contents,
2249 which could be used in certain rare security vulnerability
2250 exploits. This configuration is recommended when userspace
2251 still uses the vsyscall area.
2252
2253 config LEGACY_VSYSCALL_NONE
2254 bool "None"
2255 help
2256 There will be no vsyscall mapping at all. This will
2257 eliminate any risk of ASLR bypass due to the vsyscall
2258 fixed address mapping. Attempts to use the vsyscalls
2259 will be reported to dmesg, so that either old or
2260 malicious userspace programs can be identified.
2261
2262endchoice
2263
Tim Bird516cbf32008-08-12 12:52:36 -07002264config CMDLINE_BOOL
2265 bool "Built-in kernel command line"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002266 ---help---
Tim Bird516cbf32008-08-12 12:52:36 -07002267 Allow for specifying boot arguments to the kernel at
2268 build time. On some systems (e.g. embedded ones), it is
2269 necessary or convenient to provide some or all of the
2270 kernel boot arguments with the kernel itself (that is,
2271 to not rely on the boot loader to provide them.)
2272
2273 To compile command line arguments into the kernel,
2274 set this option to 'Y', then fill in the
Sébastien Hinderer69711ca2015-07-08 00:02:01 +02002275 boot arguments in CONFIG_CMDLINE.
Tim Bird516cbf32008-08-12 12:52:36 -07002276
2277 Systems with fully functional boot loaders (i.e. non-embedded)
2278 should leave this option set to 'N'.
2279
2280config CMDLINE
2281 string "Built-in kernel command string"
2282 depends on CMDLINE_BOOL
2283 default ""
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002284 ---help---
Tim Bird516cbf32008-08-12 12:52:36 -07002285 Enter arguments here that should be compiled into the kernel
2286 image and used at boot time. If the boot loader provides a
2287 command line at boot time, it is appended to this string to
2288 form the full kernel command line, when the system boots.
2289
2290 However, you can use the CONFIG_CMDLINE_OVERRIDE option to
2291 change this behavior.
2292
2293 In most cases, the command line (whether built-in or provided
2294 by the boot loader) should specify the device for the root
2295 file system.
2296
2297config CMDLINE_OVERRIDE
2298 bool "Built-in command line overrides boot loader arguments"
Tim Bird516cbf32008-08-12 12:52:36 -07002299 depends on CMDLINE_BOOL
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002300 ---help---
Tim Bird516cbf32008-08-12 12:52:36 -07002301 Set this option to 'Y' to have the kernel ignore the boot loader
2302 command line, and use ONLY the built-in command line.
2303
2304 This is used to work around broken boot loaders. This should
2305 be set to 'N' under normal conditions.
2306
Andy Lutomirskia5b9e5a2015-07-30 14:31:34 -07002307config MODIFY_LDT_SYSCALL
2308 bool "Enable the LDT (local descriptor table)" if EXPERT
2309 default y
2310 ---help---
2311 Linux can allow user programs to install a per-process x86
2312 Local Descriptor Table (LDT) using the modify_ldt(2) system
2313 call. This is required to run 16-bit or segmented code such as
2314 DOSEMU or some Wine programs. It is also used by some very old
2315 threading libraries.
2316
2317 Enabling this feature adds a small amount of overhead to
2318 context switches and increases the low-level kernel attack
2319 surface. Disabling it removes the modify_ldt(2) system call.
2320
2321 Saying 'N' here may make sense for embedded or server kernels.
2322
Seth Jenningsb700e7f2014-12-16 11:58:19 -06002323source "kernel/livepatch/Kconfig"
2324
Sam Ravnborg506f1d072007-11-09 21:56:54 +01002325endmenu
2326
Michal Hocko3072e412017-09-08 16:11:39 -07002327config ARCH_HAS_ADD_PAGES
2328 def_bool y
2329 depends on X86_64 && ARCH_ENABLE_MEMORY_HOTPLUG
2330
Sam Ravnborg506f1d072007-11-09 21:56:54 +01002331config ARCH_ENABLE_MEMORY_HOTPLUG
2332 def_bool y
2333 depends on X86_64 || (X86_32 && HIGHMEM)
2334
Gary Hade35551052008-10-31 10:52:03 -07002335config ARCH_ENABLE_MEMORY_HOTREMOVE
2336 def_bool y
2337 depends on MEMORY_HOTPLUG
2338
Lee Schermerhorne534c7c2010-05-26 14:44:58 -07002339config USE_PERCPU_NUMA_NODE_ID
Tejun Heo645a7912011-01-23 14:37:40 +01002340 def_bool y
Lee Schermerhorne534c7c2010-05-26 14:44:58 -07002341 depends on NUMA
2342
Kirill A. Shutemov94918462013-11-14 14:31:10 -08002343config ARCH_ENABLE_SPLIT_PMD_PTLOCK
2344 def_bool y
2345 depends on X86_64 || X86_PAE
2346
Naoya Horiguchic177c812014-06-04 16:05:35 -07002347config ARCH_ENABLE_HUGEPAGE_MIGRATION
2348 def_bool y
2349 depends on X86_64 && HUGETLB_PAGE && MIGRATION
2350
Naoya Horiguchi9c670ea2017-09-08 16:10:53 -07002351config ARCH_ENABLE_THP_MIGRATION
2352 def_bool y
2353 depends on X86_64 && TRANSPARENT_HUGEPAGE
2354
Bjorn Helgaasda85f862008-11-05 13:37:27 -06002355menu "Power management and ACPI options"
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002356
2357config ARCH_HIBERNATION_HEADER
Harvey Harrison3c2362e2008-01-30 13:31:03 +01002358 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002359 depends on X86_64 && HIBERNATION
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002360
2361source "kernel/power/Kconfig"
2362
2363source "drivers/acpi/Kconfig"
2364
Feng Tangefafc8b2009-08-14 15:23:29 -04002365source "drivers/sfi/Kconfig"
2366
Andi Kleena6b68072008-01-30 13:32:49 +01002367config X86_APM_BOOT
Jan Beulich6fc108a2010-04-21 15:23:44 +01002368 def_bool y
Paul Bolle282e5aa2011-11-17 11:41:31 +01002369 depends on APM
Andi Kleena6b68072008-01-30 13:32:49 +01002370
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002371menuconfig APM
2372 tristate "APM (Advanced Power Management) BIOS support"
Ingo Molnarefefa6f2008-07-10 16:09:50 +02002373 depends on X86_32 && PM_SLEEP
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002374 ---help---
2375 APM is a BIOS specification for saving power using several different
2376 techniques. This is mostly useful for battery powered laptops with
2377 APM compliant BIOSes. If you say Y here, the system time will be
2378 reset after a RESUME operation, the /proc/apm device will provide
2379 battery status information, and user-space programs will receive
2380 notification of APM "events" (e.g. battery status change).
2381
2382 If you select "Y" here, you can disable actual use of the APM
2383 BIOS by passing the "apm=off" option to the kernel at boot time.
2384
2385 Note that the APM support is almost completely disabled for
2386 machines with more than one CPU.
2387
2388 In order to use APM, you will need supporting software. For location
Michael Witten2dc98fd2011-07-08 21:11:16 +00002389 and more information, read <file:Documentation/power/apm-acpi.txt>
2390 and the Battery Powered Linux mini-HOWTO, available from
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002391 <http://www.tldp.org/docs.html#howto>.
2392
2393 This driver does not spin down disk drives (see the hdparm(8)
2394 manpage ("man 8 hdparm") for that), and it doesn't turn off
2395 VESA-compliant "green" monitors.
2396
2397 This driver does not support the TI 4000M TravelMate and the ACER
2398 486/DX4/75 because they don't have compliant BIOSes. Many "green"
2399 desktop machines also don't have compliant BIOSes, and this driver
2400 may cause those machines to panic during the boot phase.
2401
2402 Generally, if you don't have a battery in your machine, there isn't
2403 much point in using this driver and you should say N. If you get
2404 random kernel OOPSes or reboots that don't seem to be related to
2405 anything, try disabling/enabling this option (or disabling/enabling
2406 APM in your BIOS).
2407
2408 Some other things you should try when experiencing seemingly random,
2409 "weird" problems:
2410
2411 1) make sure that you have enough swap space and that it is
2412 enabled.
2413 2) pass the "no-hlt" option to the kernel
2414 3) switch on floating point emulation in the kernel and pass
2415 the "no387" option to the kernel
2416 4) pass the "floppy=nodma" option to the kernel
2417 5) pass the "mem=4M" option to the kernel (thereby disabling
2418 all but the first 4 MB of RAM)
2419 6) make sure that the CPU is not over clocked.
2420 7) read the sig11 FAQ at <http://www.bitwizard.nl/sig11/>
2421 8) disable the cache from your BIOS settings
2422 9) install a fan for the video card or exchange video RAM
2423 10) install a better fan for the CPU
2424 11) exchange RAM chips
2425 12) exchange the motherboard.
2426
2427 To compile this driver as a module, choose M here: the
2428 module will be called apm.
2429
2430if APM
2431
2432config APM_IGNORE_USER_SUSPEND
2433 bool "Ignore USER SUSPEND"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002434 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002435 This option will ignore USER SUSPEND requests. On machines with a
2436 compliant APM BIOS, you want to say N. However, on the NEC Versa M
2437 series notebooks, it is necessary to say Y because of a BIOS bug.
2438
2439config APM_DO_ENABLE
2440 bool "Enable PM at boot time"
2441 ---help---
2442 Enable APM features at boot time. From page 36 of the APM BIOS
2443 specification: "When disabled, the APM BIOS does not automatically
2444 power manage devices, enter the Standby State, enter the Suspend
2445 State, or take power saving steps in response to CPU Idle calls."
2446 This driver will make CPU Idle calls when Linux is idle (unless this
2447 feature is turned off -- see "Do CPU IDLE calls", below). This
2448 should always save battery power, but more complicated APM features
2449 will be dependent on your BIOS implementation. You may need to turn
2450 this option off if your computer hangs at boot time when using APM
2451 support, or if it beeps continuously instead of suspending. Turn
2452 this off if you have a NEC UltraLite Versa 33/C or a Toshiba
2453 T400CDT. This is off by default since most machines do fine without
2454 this feature.
2455
2456config APM_CPU_IDLE
Len Browndd8af072013-02-09 21:10:04 -05002457 depends on CPU_IDLE
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002458 bool "Make CPU Idle calls when idle"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002459 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002460 Enable calls to APM CPU Idle/CPU Busy inside the kernel's idle loop.
2461 On some machines, this can activate improved power savings, such as
2462 a slowed CPU clock rate, when the machine is idle. These idle calls
2463 are made after the idle loop has run for some length of time (e.g.,
2464 333 mS). On some machines, this will cause a hang at boot time or
2465 whenever the CPU becomes idle. (On machines with more than one CPU,
2466 this option does nothing.)
2467
2468config APM_DISPLAY_BLANK
2469 bool "Enable console blanking using APM"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002470 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002471 Enable console blanking using the APM. Some laptops can use this to
2472 turn off the LCD backlight when the screen blanker of the Linux
2473 virtual console blanks the screen. Note that this is only used by
2474 the virtual console screen blanker, and won't turn off the backlight
2475 when using the X Window system. This also doesn't have anything to
2476 do with your VESA-compliant power-saving monitor. Further, this
2477 option doesn't work for all laptops -- it might not turn off your
2478 backlight at all, or it might print a lot of errors to the console,
2479 especially if you are using gpm.
2480
2481config APM_ALLOW_INTS
2482 bool "Allow interrupts during APM BIOS calls"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002483 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002484 Normally we disable external interrupts while we are making calls to
2485 the APM BIOS as a measure to lessen the effects of a badly behaving
2486 BIOS implementation. The BIOS should reenable interrupts if it
2487 needs to. Unfortunately, some BIOSes do not -- especially those in
2488 many of the newer IBM Thinkpads. If you experience hangs when you
2489 suspend, try setting this to Y. Otherwise, say N.
2490
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002491endif # APM
2492
Dave Jonesbb0a56e2011-05-19 18:51:07 -04002493source "drivers/cpufreq/Kconfig"
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002494
2495source "drivers/cpuidle/Kconfig"
2496
Andy Henroid27471fd2008-10-09 11:45:22 -07002497source "drivers/idle/Kconfig"
2498
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002499endmenu
2500
2501
2502menu "Bus options (PCI etc.)"
2503
2504config PCI
Ingo Molnar1ac97012008-05-19 14:10:14 +02002505 bool "PCI support"
Adrian Bunk1c858082008-01-30 13:32:32 +01002506 default y
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002507 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002508 Find out whether you have a PCI motherboard. PCI is the name of a
2509 bus system, i.e. the way the CPU talks to the other stuff inside
2510 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
2511 VESA. If you have PCI, say Y, otherwise N.
2512
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002513choice
2514 prompt "PCI access mode"
Ingo Molnarefefa6f2008-07-10 16:09:50 +02002515 depends on X86_32 && PCI
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002516 default PCI_GOANY
2517 ---help---
2518 On PCI systems, the BIOS can be used to detect the PCI devices and
2519 determine their configuration. However, some old PCI motherboards
2520 have BIOS bugs and may crash if this is done. Also, some embedded
2521 PCI-based systems don't have any BIOS at all. Linux can also try to
2522 detect the PCI hardware directly without using the BIOS.
2523
2524 With this option, you can specify how Linux should detect the
2525 PCI devices. If you choose "BIOS", the BIOS will be used,
2526 if you choose "Direct", the BIOS won't be used, and if you
2527 choose "MMConfig", then PCI Express MMCONFIG will be used.
2528 If you choose "Any", the kernel will try MMCONFIG, then the
2529 direct access method and falls back to the BIOS if that doesn't
2530 work. If unsure, go with the default, which is "Any".
2531
2532config PCI_GOBIOS
2533 bool "BIOS"
2534
2535config PCI_GOMMCONFIG
2536 bool "MMConfig"
2537
2538config PCI_GODIRECT
2539 bool "Direct"
2540
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07002541config PCI_GOOLPC
Daniel Drake76fb6572010-09-23 17:28:04 +01002542 bool "OLPC XO-1"
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07002543 depends on OLPC
2544
Andres Salomon2bdd1b02008-06-05 14:14:41 -07002545config PCI_GOANY
2546 bool "Any"
2547
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002548endchoice
2549
2550config PCI_BIOS
Harvey Harrison3c2362e2008-01-30 13:31:03 +01002551 def_bool y
Ingo Molnarefefa6f2008-07-10 16:09:50 +02002552 depends on X86_32 && PCI && (PCI_GOBIOS || PCI_GOANY)
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002553
2554# x86-64 doesn't support PCI BIOS access from long mode so always go direct.
2555config PCI_DIRECT
Harvey Harrison3c2362e2008-01-30 13:31:03 +01002556 def_bool y
Shaohua Li0aba4962011-05-27 14:59:39 +08002557 depends on PCI && (X86_64 || (PCI_GODIRECT || PCI_GOANY || PCI_GOOLPC || PCI_GOMMCONFIG))
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002558
2559config PCI_MMCONFIG
Harvey Harrison3c2362e2008-01-30 13:31:03 +01002560 def_bool y
Feng Tang5f0db7a2009-08-14 15:37:50 -04002561 depends on X86_32 && PCI && (ACPI || SFI) && (PCI_GOMMCONFIG || PCI_GOANY)
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002562
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07002563config PCI_OLPC
Andres Salomon2bdd1b02008-06-05 14:14:41 -07002564 def_bool y
2565 depends on PCI && OLPC && (PCI_GOOLPC || PCI_GOANY)
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07002566
Alex Nixonb5401a92010-03-18 16:31:34 -04002567config PCI_XEN
2568 def_bool y
2569 depends on PCI && XEN
2570 select SWIOTLB_XEN
2571
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002572config PCI_DOMAINS
Harvey Harrison3c2362e2008-01-30 13:31:03 +01002573 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002574 depends on PCI
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002575
2576config PCI_MMCONFIG
2577 bool "Support mmconfig PCI config space access"
2578 depends on X86_64 && PCI && ACPI
2579
Ira W. Snyder3f6ea842010-04-01 11:43:30 -07002580config PCI_CNB20LE_QUIRK
David Rientjes6a108a12011-01-20 14:44:16 -08002581 bool "Read CNB20LE Host Bridge Windows" if EXPERT
Kees Cook6ea30382012-10-02 11:16:47 -07002582 depends on PCI
Ira W. Snyder3f6ea842010-04-01 11:43:30 -07002583 help
2584 Read the PCI windows out of the CNB20LE host bridge. This allows
2585 PCI hotplug to work on systems with the CNB20LE chipset which do
2586 not have ACPI.
2587
Bjorn Helgaas64a5fed2011-01-06 10:12:30 -07002588 There's no public spec for this chipset, and this functionality
2589 is known to be incomplete.
2590
2591 You should say N unless you know you need this.
2592
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002593source "drivers/pci/Kconfig"
2594
William Breathitt Gray3a495512016-05-27 18:08:27 -04002595config ISA_BUS
2596 bool "ISA-style bus support on modern systems" if EXPERT
2597 select ISA_BUS_API
2598 help
2599 Enables ISA-style drivers on modern systems. This is necessary to
2600 support PC/104 devices on X86_64 platforms.
2601
2602 If unsure, say N.
2603
David Rientjes1c00f012011-03-22 16:34:59 -07002604# x86_64 have no ISA slots, but can have ISA-style DMA.
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002605config ISA_DMA_API
David Rientjes1c00f012011-03-22 16:34:59 -07002606 bool "ISA-style DMA support" if (X86_64 && EXPERT)
2607 default y
2608 help
2609 Enables ISA-style DMA support for devices requiring such controllers.
2610 If unsure, say Y.
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002611
Linus Torvalds51e68d02016-05-21 10:25:19 -07002612if X86_32
2613
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002614config ISA
2615 bool "ISA support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002616 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002617 Find out whether you have ISA slots on your motherboard. ISA is the
2618 name of a bus system, i.e. the way the CPU talks to the other stuff
2619 inside your box. Other bus systems are PCI, EISA, MicroChannel
2620 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
2621 newer boards don't support it. If you have ISA, say Y, otherwise N.
2622
2623config EISA
2624 bool "EISA support"
2625 depends on ISA
2626 ---help---
2627 The Extended Industry Standard Architecture (EISA) bus was
2628 developed as an open alternative to the IBM MicroChannel bus.
2629
2630 The EISA bus provided some of the features of the IBM MicroChannel
2631 bus while maintaining backward compatibility with cards made for
2632 the older ISA bus. The EISA bus saw limited use between 1988 and
2633 1995 when it was made obsolete by the PCI bus.
2634
2635 Say Y here if you are building a kernel for an EISA-based machine.
2636
2637 Otherwise, say N.
2638
2639source "drivers/eisa/Kconfig"
2640
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002641config SCx200
2642 tristate "NatSemi SCx200 support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002643 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002644 This provides basic support for National Semiconductor's
2645 (now AMD's) Geode processors. The driver probes for the
2646 PCI-IDs of several on-chip devices, so its a good dependency
2647 for other scx200_* drivers.
2648
2649 If compiled as a module, the driver is named scx200.
2650
2651config SCx200HR_TIMER
2652 tristate "NatSemi SCx200 27MHz High-Resolution Timer Support"
John Stultz592913e2010-07-13 17:56:20 -07002653 depends on SCx200
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002654 default y
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002655 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002656 This driver provides a clocksource built upon the on-chip
2657 27MHz high-resolution timer. Its also a workaround for
2658 NSC Geode SC-1100's buggy TSC, which loses time when the
2659 processor goes idle (as is done by the scheduler). The
2660 other workaround is idle=poll boot option.
2661
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07002662config OLPC
2663 bool "One Laptop Per Child support"
Thomas Gleixner54008972011-02-23 09:50:15 +01002664 depends on !X86_PAE
Andres Salomon3c554942009-12-14 18:00:36 -08002665 select GPIOLIB
Thomas Gleixnerdc3119e702011-02-23 10:08:31 +01002666 select OF
Daniel Drake45bb1672011-03-13 15:10:17 +00002667 select OF_PROMTREE
Grant Likelyb4e51852011-12-16 15:50:17 -07002668 select IRQ_DOMAIN
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002669 ---help---
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07002670 Add support for detecting the unique features of the OLPC
2671 XO hardware.
2672
Daniel Drakea3128582011-06-25 17:34:10 +01002673config OLPC_XO1_PM
2674 bool "OLPC XO-1 Power Management"
Daniel Drake97c4cb72011-06-25 17:34:11 +01002675 depends on OLPC && MFD_CS5535 && PM_SLEEP
Daniel Drakea3128582011-06-25 17:34:10 +01002676 select MFD_CORE
Daniel Drakebf1ebf02010-10-10 10:40:32 +01002677 ---help---
Daniel Drake97c4cb72011-06-25 17:34:11 +01002678 Add support for poweroff and suspend of the OLPC XO-1 laptop.
Daniel Drakebf1ebf02010-10-10 10:40:32 +01002679
Daniel Drakecfee9592011-06-25 17:34:17 +01002680config OLPC_XO1_RTC
2681 bool "OLPC XO-1 Real Time Clock"
2682 depends on OLPC_XO1_PM && RTC_DRV_CMOS
2683 ---help---
2684 Add support for the XO-1 real time clock, which can be used as a
2685 programmable wakeup source.
2686
Daniel Drake7feda8e2011-06-25 17:34:12 +01002687config OLPC_XO1_SCI
2688 bool "OLPC XO-1 SCI extras"
Daniel Draked8d01a62011-07-24 18:33:21 +01002689 depends on OLPC && OLPC_XO1_PM
Randy Dunlaped8e47f2012-12-18 12:22:17 -08002690 depends on INPUT=y
Daniel Draked8d01a62011-07-24 18:33:21 +01002691 select POWER_SUPPLY
Daniel Drake7feda8e2011-06-25 17:34:12 +01002692 select GPIO_CS5535
2693 select MFD_CORE
2694 ---help---
2695 Add support for SCI-based features of the OLPC XO-1 laptop:
Daniel Drake7bc74b32011-06-25 17:34:14 +01002696 - EC-driven system wakeups
Daniel Drake7feda8e2011-06-25 17:34:12 +01002697 - Power button
Daniel Drake7bc74b32011-06-25 17:34:14 +01002698 - Ebook switch
Daniel Drake2cf2bae2011-06-25 17:34:15 +01002699 - Lid switch
Daniel Drakee1040ac2011-06-25 17:34:16 +01002700 - AC adapter status updates
2701 - Battery status updates
Daniel Drake7feda8e2011-06-25 17:34:12 +01002702
Daniel Drakea0f30f52011-06-25 17:34:18 +01002703config OLPC_XO15_SCI
2704 bool "OLPC XO-1.5 SCI extras"
Daniel Draked8d01a62011-07-24 18:33:21 +01002705 depends on OLPC && ACPI
2706 select POWER_SUPPLY
Daniel Drakea0f30f52011-06-25 17:34:18 +01002707 ---help---
2708 Add support for SCI-based features of the OLPC XO-1.5 laptop:
2709 - EC-driven system wakeups
2710 - AC adapter status updates
2711 - Battery status updates
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002712
Ed Wildgoosed4f3e352011-09-20 14:00:12 -07002713config ALIX
2714 bool "PCEngines ALIX System Support (LED setup)"
2715 select GPIOLIB
2716 ---help---
2717 This option enables system support for the PCEngines ALIX.
2718 At present this just sets up LEDs for GPIO control on
2719 ALIX2/3/6 boards. However, other system specific setup should
2720 get added here.
2721
2722 Note: You must still enable the drivers for GPIO and LED support
2723 (GPIO_CS5535 & LEDS_GPIO) to actually use the LEDs
2724
2725 Note: You have to set alix.force=1 for boards with Award BIOS.
2726
Philip Prindevilleda4e3302012-03-05 15:05:15 -08002727config NET5501
2728 bool "Soekris Engineering net5501 System Support (LEDS, GPIO, etc)"
2729 select GPIOLIB
2730 ---help---
2731 This option enables system support for the Soekris Engineering net5501.
2732
Philip A. Prindeville31970592012-01-14 01:45:39 -07002733config GEOS
2734 bool "Traverse Technologies GEOS System Support (LEDS, GPIO, etc)"
2735 select GPIOLIB
2736 depends on DMI
2737 ---help---
2738 This option enables system support for the Traverse Technologies GEOS.
2739
Vivien Didelot7d029122013-01-04 16:18:14 -05002740config TS5500
2741 bool "Technologic Systems TS-5500 platform support"
2742 depends on MELAN
2743 select CHECK_SIGNATURE
2744 select NEW_LEDS
2745 select LEDS_CLASS
2746 ---help---
2747 This option enables system support for the Technologic Systems TS-5500.
2748
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002749endif # X86_32
2750
Andreas Herrmann23ac4ae2010-09-17 18:03:43 +02002751config AMD_NB
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002752 def_bool y
Borislav Petkov0e152cd2010-03-12 15:43:03 +01002753 depends on CPU_SUP_AMD && PCI
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002754
2755source "drivers/pcmcia/Kconfig"
2756
Alexandre Bounine388b78a2011-03-23 16:43:03 -07002757config RAPIDIO
Alexandre Bouninefdf90ab2013-07-03 15:08:56 -07002758 tristate "RapidIO support"
Alexandre Bounine388b78a2011-03-23 16:43:03 -07002759 depends on PCI
2760 default n
2761 help
Alexandre Bouninefdf90ab2013-07-03 15:08:56 -07002762 If enabled this option will include drivers and the core
Alexandre Bounine388b78a2011-03-23 16:43:03 -07002763 infrastructure code to support RapidIO interconnect devices.
2764
2765source "drivers/rapidio/Kconfig"
2766
David Herrmanne3263ab2013-08-02 14:05:22 +02002767config X86_SYSFB
2768 bool "Mark VGA/VBE/EFI FB as generic system framebuffer"
2769 help
2770 Firmwares often provide initial graphics framebuffers so the BIOS,
2771 bootloader or kernel can show basic video-output during boot for
2772 user-guidance and debugging. Historically, x86 used the VESA BIOS
2773 Extensions and EFI-framebuffers for this, which are mostly limited
2774 to x86.
2775 This option, if enabled, marks VGA/VBE/EFI framebuffers as generic
2776 framebuffers so the new generic system-framebuffer drivers can be
2777 used on x86. If the framebuffer is not compatible with the generic
2778 modes, it is adverticed as fallback platform framebuffer so legacy
2779 drivers like efifb, vesafb and uvesafb can pick it up.
2780 If this option is not selected, all system framebuffers are always
2781 marked as fallback platform framebuffers as usual.
2782
2783 Note: Legacy fbdev drivers, including vesafb, efifb, uvesafb, will
2784 not be able to pick up generic system framebuffers if this option
2785 is selected. You are highly encouraged to enable simplefb as
2786 replacement if you select this option. simplefb can correctly deal
2787 with generic system framebuffers. But you should still keep vesafb
2788 and others enabled as fallback if a system framebuffer is
2789 incompatible with simplefb.
2790
2791 If unsure, say Y.
2792
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002793endmenu
2794
2795
2796menu "Executable file formats / Emulations"
2797
2798source "fs/Kconfig.binfmt"
2799
2800config IA32_EMULATION
2801 bool "IA32 Emulation"
2802 depends on X86_64
Ingo Molnar39f88912016-11-15 10:22:52 +01002803 select ARCH_WANT_OLD_COMPAT_IPC
Randy Dunlapd1603992013-06-18 12:33:40 -07002804 select BINFMT_ELF
Roland McGratha97f52e2008-01-30 13:31:55 +01002805 select COMPAT_BINFMT_ELF
Ingo Molnar39f88912016-11-15 10:22:52 +01002806 select COMPAT_OLD_SIGACTION
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002807 ---help---
H. J. Lu5fd92e62012-02-19 10:40:03 -08002808 Include code to run legacy 32-bit programs under a
2809 64-bit kernel. You should likely turn this on, unless you're
2810 100% sure that you don't have any 32-bit programs left.
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002811
2812config IA32_AOUT
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002813 tristate "IA32 a.out support"
2814 depends on IA32_EMULATION
2815 ---help---
2816 Support old a.out binaries in the 32bit emulation.
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002817
H. Peter Anvin0bf62762012-02-27 14:09:10 -08002818config X86_X32
Kees Cook6ea30382012-10-02 11:16:47 -07002819 bool "x32 ABI for 64-bit mode"
Brian Gerst9b540502015-06-22 07:55:21 -04002820 depends on X86_64
H. J. Lu5fd92e62012-02-19 10:40:03 -08002821 ---help---
2822 Include code to run binaries for the x32 native 32-bit ABI
2823 for 64-bit processors. An x32 process gets access to the
2824 full 64-bit register file and wide data path while leaving
2825 pointers at 32 bits for smaller memory footprint.
2826
2827 You will need a recent binutils (2.22 or later) with
2828 elf32_x86_64 support enabled to compile a kernel with this
2829 option set.
2830
Ingo Molnar953fee12016-11-15 10:22:52 +01002831config COMPAT_32
2832 def_bool y
2833 depends on IA32_EMULATION || X86_32
2834 select HAVE_UID16
2835 select OLD_SIGSUSPEND3
2836
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002837config COMPAT
Harvey Harrison3c2362e2008-01-30 13:31:03 +01002838 def_bool y
H. Peter Anvin0bf62762012-02-27 14:09:10 -08002839 depends on IA32_EMULATION || X86_X32
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002840
Jan Beulich3120e252012-09-10 12:41:45 +01002841if COMPAT
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002842config COMPAT_FOR_U64_ALIGNMENT
Jan Beulich3120e252012-09-10 12:41:45 +01002843 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002844
2845config SYSVIPC_COMPAT
Harvey Harrison3c2362e2008-01-30 13:31:03 +01002846 def_bool y
Jan Beulich3120e252012-09-10 12:41:45 +01002847 depends on SYSVIPC
Jan Beulich3120e252012-09-10 12:41:45 +01002848endif
David Howellsee009e4a02011-03-07 15:06:20 +00002849
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002850endmenu
2851
2852
Keith Packarde5beae12008-11-03 18:21:45 +01002853config HAVE_ATOMIC_IOMAP
2854 def_bool y
2855 depends on X86_32
2856
Alessandro Rubini4692d772012-04-04 19:39:58 +02002857config X86_DEV_DMA_OPS
2858 bool
Alessandro Rubini83125a32012-04-04 19:40:21 +02002859 depends on X86_64 || STA2X11
Alessandro Rubini4692d772012-04-04 19:39:58 +02002860
Alessandro Rubinif7219a52012-04-04 19:40:10 +02002861config X86_DMA_REMAP
2862 bool
Alessandro Rubini83125a32012-04-04 19:40:21 +02002863 depends on STA2X11
Alessandro Rubinif7219a52012-04-04 19:40:10 +02002864
Kirill A. Shutemove5855132017-06-06 14:31:20 +03002865config HAVE_GENERIC_GUP
2866 def_bool y
2867
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002868source "net/Kconfig"
2869
2870source "drivers/Kconfig"
2871
2872source "drivers/firmware/Kconfig"
2873
2874source "fs/Kconfig"
2875
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002876source "arch/x86/Kconfig.debug"
2877
2878source "security/Kconfig"
2879
2880source "crypto/Kconfig"
2881
Avi Kivityedf88412007-12-16 11:02:48 +02002882source "arch/x86/kvm/Kconfig"
2883
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002884source "lib/Kconfig"