blob: eb79036e350312e500fa5ef33b88965b80f3988b [file] [log] [blame]
Sam Ravnborgdaa93fa2007-11-12 20:54:30 +01001# Select 32 or 64 bit
2config 64BIT
Sam Ravnborg68409992007-11-17 15:37:31 +01003 bool "64-bit kernel" if ARCH = "x86"
David Woodhouseffee0de2012-12-20 21:51:55 +00004 default ARCH != "i386"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01005 ---help---
Sam Ravnborgdaa93fa2007-11-12 20:54:30 +01006 Say yes to build a 64-bit kernel - formerly known as x86_64
7 Say no to build a 32-bit kernel - formerly known as i386
8
9config X86_32
Jan Beulich3120e252012-09-10 12:41:45 +010010 def_bool y
11 depends on !64BIT
Russell King82491452011-05-08 18:55:19 +010012 select CLKSRC_I8253
Catalin Marinasaf1839e2012-10-08 16:28:08 -070013 select HAVE_UID16
Sam Ravnborgdaa93fa2007-11-12 20:54:30 +010014
15config X86_64
Jan Beulich3120e252012-09-10 12:41:45 +010016 def_bool y
17 depends on 64BIT
Alessandro Rubini4692d772012-04-04 19:39:58 +020018 select X86_DEV_DMA_OPS
Linus Torvaldsbc08b442013-09-02 12:12:15 -070019 select ARCH_USE_CMPXCHG_LOCKREF
Josh Poimboeuf12cf89b2015-02-03 16:45:18 -060020 select HAVE_LIVEPATCH
Sam Ravnborg1032c0b2007-11-06 21:35:08 +010021
22### Arch settings
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010023config X86
Harvey Harrison3c2362e2008-01-30 13:31:03 +010024 def_bool y
Hanjun Guo46ba51e2014-07-18 18:02:54 +080025 select ARCH_MIGHT_HAVE_ACPI_PDC if ACPI
Stephen Boyd446f24d2013-04-30 15:28:42 -070026 select ARCH_HAS_DEBUG_STRICT_USER_COPY_CHECKS
Linus Torvalds72d93102014-09-13 11:14:53 -070027 select ARCH_HAS_FAST_MULTIPLIER
Riku Voipio957e3fa2014-12-12 16:57:44 -080028 select ARCH_HAS_GCOV_PROFILE_ALL
Mark Salter77fbbc82013-10-07 22:18:07 -040029 select ARCH_MIGHT_HAVE_PC_PARPORT
Mark Salter5e2c18c2014-01-01 11:34:16 -080030 select ARCH_MIGHT_HAVE_PC_SERIO
David Woodhousee17c6d52008-06-17 12:19:34 +010031 select HAVE_AOUT if X86_32
Ingo Molnara5574cf2008-05-05 23:19:50 +020032 select HAVE_UNSTABLE_SCHED_CLOCK
Mel Gorman4468dd72014-06-04 16:06:29 -070033 select ARCH_SUPPORTS_NUMA_BALANCING if X86_64
Peter Zijlstrabe5e6102013-11-18 18:27:06 +010034 select ARCH_SUPPORTS_INT128 if X86_64
Sam Ravnborgec7748b2008-02-09 10:46:40 +010035 select HAVE_IDE
Mathieu Desnoyers42d4b832008-02-02 15:10:34 -050036 select HAVE_OPROFILE
Ralf Baechle8761f1a2011-06-01 19:05:09 +010037 select HAVE_PCSPKR_PLATFORM
Peter Zijlstracc2067a2010-11-16 21:49:01 +010038 select HAVE_PERF_EVENTS
Rik van Riel28b2ee22008-07-23 21:27:05 -070039 select HAVE_IOREMAP_PROT
Mathieu Desnoyers3f550092008-02-02 15:10:35 -050040 select HAVE_KPROBES
Yinghai Lu72d7c3b2010-08-25 13:39:17 -070041 select HAVE_MEMBLOCK
Tejun Heo0608f702011-07-14 11:44:23 +020042 select HAVE_MEMBLOCK_NODE_MAP
Tejun Heoc378ddd2011-07-14 11:46:03 +020043 select ARCH_DISCARD_MEMBLOCK
Ingo Molnar1f972762008-07-26 13:52:50 +020044 select ARCH_WANT_OPTIONAL_GPIOLIB
Ingo Molnarda4276b2009-01-07 11:05:10 +010045 select ARCH_WANT_FRAME_POINTERS
FUJITA Tomonori7c095e42009-06-17 16:28:12 -070046 select HAVE_DMA_ATTRS
Akinobu Mita9c5a3622014-06-04 16:06:50 -070047 select HAVE_DMA_CONTIGUOUS
Ananth N Mavinakayanahalli9edddaa2008-03-04 14:28:37 -080048 select HAVE_KRETPROBES
Mark Salter5b7c73e2014-04-07 15:39:49 -070049 select GENERIC_EARLY_IOREMAP
Masami Hiramatsuc0f7ac32010-02-25 08:34:46 -050050 select HAVE_OPTPROBES
Masami Hiramatsue7dbfe32012-09-28 17:15:20 +090051 select HAVE_KPROBES_ON_FTRACE
Steven Rostedte4b2b882008-08-14 15:45:11 -040052 select HAVE_FTRACE_MCOUNT_RECORD
Steven Rostedtd57c5d52011-02-09 13:32:18 -050053 select HAVE_FENTRY if X86_64
Steven Rostedtcf4db252010-10-14 23:32:44 -040054 select HAVE_C_RECORDMCOUNT
Steven Rostedt677aa9f2008-05-17 00:01:36 -040055 select HAVE_DYNAMIC_FTRACE
Masami Hiramatsu06aeaae2012-09-28 17:15:17 +090056 select HAVE_DYNAMIC_FTRACE_WITH_REGS
Steven Rostedt606576c2008-10-06 19:06:12 -040057 select HAVE_FUNCTION_TRACER
Frederic Weisbecker48d68b22008-12-02 00:20:39 +010058 select HAVE_FUNCTION_GRAPH_TRACER
Steven Rostedt71e308a2009-06-18 12:45:08 -040059 select HAVE_FUNCTION_GRAPH_FP_TEST
Josh Stone66700002009-08-24 14:43:11 -070060 select HAVE_SYSCALL_TRACEPOINTS
Catalin Marinas7ac57a82012-10-08 16:28:16 -070061 select SYSCTL_EXCEPTION_TRACE
Ingo Molnare0ec9482009-01-27 17:01:14 +010062 select HAVE_KVM
Ingo Molnar49793b02009-01-27 17:02:29 +010063 select HAVE_ARCH_KGDB
Roland McGrath99bbc4b2008-04-20 14:35:12 -070064 select HAVE_ARCH_TRACEHOOK
Dmitry Baryshkov323ec002008-06-29 14:19:31 +040065 select HAVE_GENERIC_DMA_COHERENT if X86_32
Johannes Berg58340a02008-07-25 01:45:33 -070066 select HAVE_EFFICIENT_UNALIGNED_ACCESS
Török Edwin8d264872008-11-23 12:39:08 +020067 select USER_STACKTRACE_SUPPORT
Heiko Carstensf850c30c2010-02-10 17:25:17 +010068 select HAVE_REGS_AND_STACK_ACCESS_API
Joerg Roedel2118d0c2009-01-09 15:13:15 +010069 select HAVE_DMA_API_DEBUG
H. Peter Anvin2e9f3bd2009-01-04 15:41:25 -080070 select HAVE_KERNEL_GZIP
71 select HAVE_KERNEL_BZIP2
72 select HAVE_KERNEL_LZMA
Lasse Collin30314802011-01-12 17:01:24 -080073 select HAVE_KERNEL_XZ
Albin Tonnerre13510992010-01-08 14:42:45 -080074 select HAVE_KERNEL_LZO
Kyungsik Leef9b493a2013-07-08 16:01:48 -070075 select HAVE_KERNEL_LZ4
K.Prasad0067f122009-06-01 23:43:57 +053076 select HAVE_HW_BREAKPOINT
Frederic Weisbecker01027522010-04-11 18:55:56 +020077 select HAVE_MIXED_BREAKPOINTS_REGS
Frederic Weisbecker99e8c5a2009-12-17 01:33:54 +010078 select PERF_EVENTS
Frederic Weisbeckerc01d4322010-05-15 22:57:48 +020079 select HAVE_PERF_EVENTS_NMI
Jiri Olsac5e63192012-08-07 15:20:36 +020080 select HAVE_PERF_REGS
Jiri Olsac5ebced2012-08-07 15:20:40 +020081 select HAVE_PERF_USER_STACK_DUMP
Catalin Marinasb69ec422012-10-08 16:28:11 -070082 select HAVE_DEBUG_KMEMLEAK
Frederic Weisbecker99e8c5a2009-12-17 01:33:54 +010083 select ANON_INODES
H. Peter Anvineb068e72012-11-28 11:50:23 -080084 select HAVE_ALIGNED_STRUCT_PAGE if SLUB
85 select HAVE_CMPXCHG_LOCAL
Heiko Carstens25654092012-01-12 17:17:33 -080086 select HAVE_CMPXCHG_DOUBLE
Pekka Enberg0a4af3b2009-02-26 21:38:56 +020087 select HAVE_ARCH_KMEMCHECK
Andrey Ryabininef7f0d62015-02-13 14:39:25 -080088 select HAVE_ARCH_KASAN if X86_64 && SPARSEMEM_VMEMMAP
Avi Kivity7c68af62009-09-19 09:40:22 +030089 select HAVE_USER_RETURN_NOTIFIER
David Daneye39f5602012-01-10 15:10:21 -080090 select ARCH_BINFMT_ELF_RANDOMIZE_PIE
Steven Rostedt46eb3b62010-09-22 23:10:23 -040091 select HAVE_ARCH_JUMP_LABEL
Catalin Marinas74634492012-07-30 14:41:09 -070092 select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
Yinghai Lu141d55e2011-10-12 11:53:17 -070093 select SPARSE_IRQ
Jan Beulichc49aa5b2011-03-08 09:24:26 +000094 select GENERIC_FIND_FIRST_BIT
Thomas Gleixner3bb98082010-09-27 12:46:02 +000095 select GENERIC_IRQ_PROBE
96 select GENERIC_PENDING_IRQ if SMP
Thomas Gleixner517e4982010-12-16 17:59:57 +010097 select GENERIC_IRQ_SHOW
Martin Schwidefskyd1748302011-08-23 15:29:42 +020098 select GENERIC_CLOCKEVENTS_MIN_ADJUST
Thomas Gleixnerc01858082011-02-07 02:24:08 +010099 select IRQ_FORCED_THREADING
Sam Ravnborge47b65b2012-05-21 20:45:37 +0200100 select HAVE_BPF_JIT if X86_64
Gerald Schaefer15626062012-10-08 16:30:04 -0700101 select HAVE_ARCH_TRANSPARENT_HUGEPAGE
Laura Abbott308c09f2014-08-08 14:23:25 -0700102 select ARCH_HAS_SG_CHAIN
Thomas Gleixner0a779c52011-06-09 13:08:26 +0000103 select CLKEVT_I8253
Huang Yingdf013ff2011-07-13 13:14:22 +0800104 select ARCH_HAVE_NMI_SAFE_CMPXCHG
Michael S. Tsirkin4673ca82011-11-24 14:54:28 +0200105 select GENERIC_IOMAP
Linus Torvaldse419b4c2012-05-03 10:16:43 -0700106 select DCACHE_WORD_ACCESS
Thomas Gleixner7eb43a62012-04-20 13:05:48 +0000107 select GENERIC_SMP_IDLE_THREAD
Will Deaconc1d7e012012-07-30 14:42:46 -0700108 select ARCH_WANT_IPC_PARSE_VERSION if X86_32
Will Drewryc6cfbeb2012-04-12 16:48:03 -0500109 select HAVE_ARCH_SECCOMP_FILTER
David Daney8b5ad472012-04-24 11:23:15 -0700110 select BUILDTIME_EXTABLE_SORT
Thomas Gleixnerbdebaf82012-05-18 16:45:44 +0000111 select GENERIC_CMOS_UPDATE
Cyrill Gorcunov2bf01f92014-06-04 16:08:16 -0700112 select HAVE_ARCH_SOFT_DIRTY if X86_64
Thomas Gleixnerbdebaf82012-05-18 16:45:44 +0000113 select CLOCKSOURCE_WATCHDOG
114 select GENERIC_CLOCKEVENTS
Stefani Seiboldd2312e32014-03-17 23:22:01 +0100115 select ARCH_CLOCKSOURCE_DATA
Thomas Gleixner09ec5442014-07-16 21:05:12 +0000116 select CLOCKSOURCE_VALIDATE_LAST_CYCLE
Thomas Gleixnerbdebaf82012-05-18 16:45:44 +0000117 select GENERIC_CLOCKEVENTS_BROADCAST if X86_64 || (X86_32 && X86_LOCAL_APIC)
Stefani Seiboldd2312e32014-03-17 23:22:01 +0100118 select GENERIC_TIME_VSYSCALL
Linus Torvalds4ae73f22012-05-26 10:14:39 -0700119 select GENERIC_STRNCPY_FROM_USER
Linus Torvalds5723aa92012-05-26 11:09:53 -0700120 select GENERIC_STRNLEN_USER
Frederic Weisbecker91d1aa432012-11-27 19:33:25 +0100121 select HAVE_CONTEXT_TRACKING if X86_64
Frederic Weisbeckerfdf9c352012-09-09 14:56:31 +0200122 select HAVE_IRQ_TIME_ACCOUNTING
Stephen Rothwell4febd952013-03-07 15:48:16 +1100123 select VIRT_TO_BUS
David Howells786d35d2012-09-28 14:31:03 +0930124 select MODULES_USE_ELF_REL if X86_32
125 select MODULES_USE_ELF_RELA if X86_64
Al Viro1d4b4b22012-10-22 22:34:11 -0400126 select CLONE_BACKWARDS if X86_32
David Woodhouse83a57a42012-12-20 01:16:20 +0000127 select ARCH_USE_BUILTIN_BSWAP
Waiman Longbd01ec12014-02-03 13:18:57 +0100128 select ARCH_USE_QUEUE_RWLOCK
Al Viro15ce1f72012-12-25 16:09:20 -0500129 select OLD_SIGSUSPEND3 if X86_32 || IA32_EMULATION
Al Viro5b3eb3a2012-12-25 19:14:55 -0500130 select OLD_SIGACTION if X86_32
131 select COMPAT_OLD_SIGACTION if IA32_EMULATION
Prarit Bhargava3195ef52013-02-14 12:02:54 -0500132 select RTC_LIB
Dave Hansend1a1dc02013-07-01 13:04:42 -0700133 select HAVE_DEBUG_STACKOVERFLOW
Frederic Weisbeckera2cd11f2013-09-24 17:18:36 +0200134 select HAVE_IRQ_EXIT_ON_IRQ_STACK if X86_64
Kees Cook19952a92013-12-19 11:35:58 -0800135 select HAVE_CC_STACKPROTECTOR
Ard Biesheuvel2b9c1f02014-02-08 13:34:10 +0100136 select GENERIC_CPU_AUTOPROBE
AKASHI Takahiro7a017722014-02-25 18:16:24 +0900137 select HAVE_ARCH_AUDITSYSCALL
Peter Zijlstra4badad32014-06-06 19:53:16 +0200138 select ARCH_SUPPORTS_ATOMIC_RMW
Tomasz Nowicki44a69f62014-07-22 11:20:12 +0200139 select HAVE_ACPI_APEI if ACPI
140 select HAVE_ACPI_APEI_NMI if ACPI
Graeme Gregory8a1664b2014-07-18 18:02:52 +0800141 select ACPI_LEGACY_TABLES_LOOKUP if ACPI
Josh Triplett9def39be2013-10-30 08:09:45 -0700142 select X86_FEATURE_NAMES if PROC_FS
Pranith Kumar83fe27e2014-12-05 11:24:45 -0500143 select SRCU
Balbir Singh7d8330a2008-02-10 12:46:28 +0530144
Ingo Molnarba7e4d12009-06-06 13:58:12 +0200145config INSTRUCTION_DECODER
Jan Beulich3120e252012-09-10 12:41:45 +0100146 def_bool y
147 depends on KPROBES || PERF_EVENTS || UPROBES
Ingo Molnarba7e4d12009-06-06 13:58:12 +0200148
Peter Zijlstra7fb0f1d2014-10-24 09:12:35 +0200149config PERF_EVENTS_INTEL_UNCORE
150 def_bool y
Peter Zijlstra (Intel)ce5686d2014-10-29 11:17:04 +0100151 depends on PERF_EVENTS && CPU_SUP_INTEL && PCI
Peter Zijlstra7fb0f1d2014-10-24 09:12:35 +0200152
Linus Torvalds51b26ad2009-04-26 10:12:47 -0700153config OUTPUT_FORMAT
154 string
155 default "elf32-i386" if X86_32
156 default "elf64-x86-64" if X86_64
157
Sam Ravnborg73531902008-05-25 23:03:18 +0200158config ARCH_DEFCONFIG
Sam Ravnborgb9b39bf2008-04-29 12:48:15 +0200159 string
Sam Ravnborg73531902008-05-25 23:03:18 +0200160 default "arch/x86/configs/i386_defconfig" if X86_32
161 default "arch/x86/configs/x86_64_defconfig" if X86_64
Sam Ravnborgb9b39bf2008-04-29 12:48:15 +0200162
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100163config LOCKDEP_SUPPORT
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100164 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100165
166config STACKTRACE_SUPPORT
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100167 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100168
Heiko Carstensaa7d9352008-02-01 17:45:14 +0100169config HAVE_LATENCYTOP_SUPPORT
170 def_bool y
171
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100172config MMU
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100173 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100174
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100175config SBUS
176 bool
177
FUJITA Tomonori3bc4e452010-03-10 15:23:22 -0800178config NEED_DMA_MAP_STATE
Jan Beulich3120e252012-09-10 12:41:45 +0100179 def_bool y
Konrad Rzeszutek Wilka6dfa122015-04-17 15:04:48 -0400180 depends on X86_64 || INTEL_IOMMU || DMA_API_DEBUG || SWIOTLB
FUJITA Tomonori3bc4e452010-03-10 15:23:22 -0800181
FUJITA Tomonori18e98302010-05-26 14:44:32 -0700182config NEED_SG_DMA_LENGTH
Andrew Morton4a14d842010-05-26 14:44:33 -0700183 def_bool y
FUJITA Tomonori18e98302010-05-26 14:44:32 -0700184
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100185config GENERIC_ISA_DMA
Jan Beulich3120e252012-09-10 12:41:45 +0100186 def_bool y
187 depends on ISA_DMA_API
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100188
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100189config GENERIC_BUG
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100190 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100191 depends on BUG
Jan Beulichb93a5312008-12-16 11:40:27 +0000192 select GENERIC_BUG_RELATIVE_POINTERS if X86_64
193
194config GENERIC_BUG_RELATIVE_POINTERS
195 bool
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100196
197config GENERIC_HWEIGHT
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100198 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100199
200config ARCH_MAY_HAVE_PC_FDC
Jan Beulich3120e252012-09-10 12:41:45 +0100201 def_bool y
202 depends on ISA_DMA_API
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100203
Sam Ravnborg1032c0b2007-11-06 21:35:08 +0100204config RWSEM_XCHGADD_ALGORITHM
Jan Beulich3120e252012-09-10 12:41:45 +0100205 def_bool y
Sam Ravnborg1032c0b2007-11-06 21:35:08 +0100206
Sam Ravnborg1032c0b2007-11-06 21:35:08 +0100207config GENERIC_CALIBRATE_DELAY
208 def_bool y
209
venkatesh.pallipadi@intel.com9a0b8412008-01-31 17:35:06 -0800210config ARCH_HAS_CPU_RELAX
211 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100212
Pekka Enberg1b27d052008-04-28 02:12:22 -0700213config ARCH_HAS_CACHE_LINE_SIZE
214 def_bool y
215
Mike Travisdd5af902008-01-30 13:33:32 +0100216config HAVE_SETUP_PER_CPU_AREA
Brian Gerst89c9c4c2009-01-27 12:56:48 +0900217 def_bool y
travis@sgi.comb32ef632008-01-30 13:32:51 +0100218
Tejun Heo08fc4582009-08-14 15:00:49 +0900219config NEED_PER_CPU_EMBED_FIRST_CHUNK
220 def_bool y
221
222config NEED_PER_CPU_PAGE_FIRST_CHUNK
Tejun Heo11124412009-02-20 16:29:09 +0900223 def_bool y
224
Johannes Berg801e4062007-12-08 02:12:39 +0100225config ARCH_HIBERNATION_POSSIBLE
226 def_bool y
Johannes Berg801e4062007-12-08 02:12:39 +0100227
Johannes Bergf4cb5702007-12-08 02:14:00 +0100228config ARCH_SUSPEND_POSSIBLE
229 def_bool y
Johannes Bergf4cb5702007-12-08 02:14:00 +0100230
Steve Cappercfe28c52013-04-29 14:29:48 +0100231config ARCH_WANT_HUGE_PMD_SHARE
232 def_bool y
233
Steve Capper53313b22013-04-30 08:03:42 +0100234config ARCH_WANT_GENERAL_HUGETLB
235 def_bool y
236
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100237config ZONE_DMA32
Jan Beuliche0fd24a2015-02-05 15:39:34 +0000238 def_bool y if X86_64
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100239
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100240config AUDIT_ARCH
Jan Beuliche0fd24a2015-02-05 15:39:34 +0000241 def_bool y if X86_64
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100242
Ingo Molnar765c68b2008-04-09 11:03:37 +0200243config ARCH_SUPPORTS_OPTIMIZED_INLINING
244 def_bool y
245
Akinobu Mita6a11f752009-03-31 15:23:17 -0700246config ARCH_SUPPORTS_DEBUG_PAGEALLOC
247 def_bool y
248
Shane Wang69575d32009-09-01 18:25:07 -0700249config HAVE_INTEL_TXT
250 def_bool y
Kees Cook6ea30382012-10-02 11:16:47 -0700251 depends on INTEL_IOMMU && ACPI
Shane Wang69575d32009-09-01 18:25:07 -0700252
Sam Ravnborg6b0c3d42008-01-30 13:32:27 +0100253config X86_32_SMP
254 def_bool y
255 depends on X86_32 && SMP
256
257config X86_64_SMP
258 def_bool y
259 depends on X86_64 && SMP
260
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100261config X86_HT
Jan Beulich6fc108a2010-04-21 15:23:44 +0100262 def_bool y
Adrian Bunkee0011a2007-12-04 17:19:07 +0100263 depends on SMP
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100264
Tejun Heoccbeed32009-02-09 22:17:40 +0900265config X86_32_LAZY_GS
266 def_bool y
Tejun Heo60a53172009-02-09 22:17:40 +0900267 depends on X86_32 && !CC_STACKPROTECTOR
Tejun Heoccbeed32009-02-09 22:17:40 +0900268
Borislav Petkovd61931d2010-03-05 17:34:46 +0100269config ARCH_HWEIGHT_CFLAGS
270 string
271 default "-fcall-saved-ecx -fcall-saved-edx" if X86_32
272 default "-fcall-saved-rdi -fcall-saved-rsi -fcall-saved-rdx -fcall-saved-rcx -fcall-saved-r8 -fcall-saved-r9 -fcall-saved-r10 -fcall-saved-r11" if X86_64
273
Srikar Dronamraju2b144492012-02-09 14:56:42 +0530274config ARCH_SUPPORTS_UPROBES
275 def_bool y
276
Rob Herringd20642f2014-04-18 17:19:54 -0500277config FIX_EARLYCON_MEM
278 def_bool y
279
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100280source "init/Kconfig"
Matt Helsleydc52ddc2008-10-18 20:27:21 -0700281source "kernel/Kconfig.freezer"
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100282
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100283menu "Processor type and features"
284
Randy Dunlap5ee71532012-01-16 11:57:18 -0800285config ZONE_DMA
286 bool "DMA memory allocation support" if EXPERT
287 default y
288 help
289 DMA memory allocation support allows devices with less than 32-bit
290 addressing to allocate within the first 16MB of address space.
291 Disable if no such devices will be used.
292
293 If unsure, say Y.
294
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100295config SMP
296 bool "Symmetric multi-processing support"
297 ---help---
298 This enables support for systems with more than one CPU. If you have
Robert Graffham4a474152014-01-23 15:55:29 -0800299 a system with only one CPU, say N. If you have a system with more
300 than one CPU, say Y.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100301
Robert Graffham4a474152014-01-23 15:55:29 -0800302 If you say N here, the kernel will run on uni- and multiprocessor
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100303 machines, but will use only one CPU of a multiprocessor machine. If
304 you say Y here, the kernel will run on many, but not all,
Robert Graffham4a474152014-01-23 15:55:29 -0800305 uniprocessor machines. On a uniprocessor machine, the kernel
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100306 will run faster if you say N here.
307
308 Note that if you say Y here and choose architecture "586" or
309 "Pentium" under "Processor family", the kernel will not work on 486
310 architectures. Similarly, multiprocessor kernels for the "PPro"
311 architecture may not work on all Pentium based boards.
312
313 People using multiprocessor machines who say Y here should also say
314 Y to "Enhanced Real Time Clock Support", below. The "Advanced Power
315 Management" code will be disabled if you say Y here.
316
Paul Bolle395cf962011-08-15 02:02:26 +0200317 See also <file:Documentation/x86/i386/IO-APIC.txt>,
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100318 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
319 <http://www.tldp.org/docs.html#howto>.
320
321 If you don't know what to do here, say N.
322
Josh Triplett9def39be2013-10-30 08:09:45 -0700323config X86_FEATURE_NAMES
324 bool "Processor feature human-readable names" if EMBEDDED
325 default y
326 ---help---
327 This option compiles in a table of x86 feature bits and corresponding
328 names. This is required to support /proc/cpuinfo and a few kernel
329 messages. You can disable this to save space, at the expense of
330 making those few kernel messages show numeric feature bits instead.
331
332 If in doubt, say Y.
333
Yinghai Lu06cd9a72009-02-16 17:29:58 -0800334config X86_X2APIC
335 bool "Support x2apic"
Suresh Siddhad3f13812011-08-23 17:05:25 -0700336 depends on X86_LOCAL_APIC && X86_64 && IRQ_REMAP
Yinghai Lu06cd9a72009-02-16 17:29:58 -0800337 ---help---
338 This enables x2apic support on CPUs that have this feature.
339
340 This allows 32-bit apic IDs (so it can support very large systems),
341 and accesses the local apic via MSRs not via mmio.
342
Yinghai Lu06cd9a72009-02-16 17:29:58 -0800343 If you don't know what to do here, say N.
344
Yinghai Lu6695c852008-06-19 12:13:09 -0700345config X86_MPPARSE
Bin Gao6e87f9b72012-10-25 09:35:44 -0700346 bool "Enable MPS table" if ACPI || SFI
Jan Beulich7a527682008-10-30 10:38:24 +0000347 default y
Ingo Molnar5ab74722008-07-10 14:42:03 +0200348 depends on X86_LOCAL_APIC
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100349 ---help---
Yinghai Lu6695c852008-06-19 12:13:09 -0700350 For old smp systems that do not have proper acpi support. Newer systems
351 (esp with 64bit cpus) with acpi support, MADT and DSDT will override it
Yinghai Lu6695c852008-06-19 12:13:09 -0700352
Yinghai Lu26f7ef12009-01-29 14:19:22 -0800353config X86_BIGSMP
354 bool "Support for big SMP systems with more than 8 CPUs"
355 depends on X86_32 && SMP
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100356 ---help---
Yinghai Lu26f7ef12009-01-29 14:19:22 -0800357 This option is needed for the systems that have more than 8 CPUs
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100358
Jun Nakajimaddd70cf2013-01-21 17:23:09 +0000359config GOLDFISH
360 def_bool y
361 depends on X86_GOLDFISH
362
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800363if X86_32
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800364config X86_EXTENDED_PLATFORM
365 bool "Support for extended (non-PC) x86 platforms"
366 default y
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100367 ---help---
Ingo Molnar06ac8342009-01-27 18:11:43 +0100368 If you disable this option then the kernel will only support
369 standard PC platforms. (which covers the vast majority of
370 systems out there.)
371
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800372 If you enable this option then you'll be able to select support
373 for the following (non-PC) 32 bit x86 platforms:
Ben Hutchingscb7b8022013-06-24 01:05:25 +0100374 Goldfish (Android emulator)
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800375 AMD Elan
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800376 RDC R-321x SoC
377 SGI 320/540 (Visual Workstation)
Alessandro Rubini83125a32012-04-04 19:40:21 +0200378 STA2X11-based (e.g. Northville)
Thomas Gleixner3f4110a2009-08-29 14:54:20 +0200379 Moorestown MID devices
Ingo Molnar06ac8342009-01-27 18:11:43 +0100380
381 If you have one of these systems, or if you want to build a
382 generic distribution kernel, say Y here - otherwise say N.
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800383endif
Ingo Molnar06ac8342009-01-27 18:11:43 +0100384
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800385if X86_64
386config X86_EXTENDED_PLATFORM
387 bool "Support for extended (non-PC) x86 platforms"
388 default y
389 ---help---
390 If you disable this option then the kernel will only support
391 standard PC platforms. (which covers the vast majority of
392 systems out there.)
393
394 If you enable this option then you'll be able to select support
395 for the following (non-PC) 64 bit x86 platforms:
Steffen Persvold44b111b52011-12-06 00:07:26 +0800396 Numascale NumaChip
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800397 ScaleMP vSMP
398 SGI Ultraviolet
399
400 If you have one of these systems, or if you want to build a
401 generic distribution kernel, say Y here - otherwise say N.
402endif
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800403# This is an alphabetically sorted list of 64 bit extended platforms
404# Please maintain the alphabetic order if and when there are additions
Steffen Persvold44b111b52011-12-06 00:07:26 +0800405config X86_NUMACHIP
406 bool "Numascale NumaChip"
407 depends on X86_64
408 depends on X86_EXTENDED_PLATFORM
409 depends on NUMA
410 depends on SMP
411 depends on X86_X2APIC
Daniel J Bluemanf9726bf2012-12-07 14:24:32 -0700412 depends on PCI_MMCONFIG
Steffen Persvold44b111b52011-12-06 00:07:26 +0800413 ---help---
414 Adds support for Numascale NumaChip large-SMP systems. Needed to
415 enable more than ~168 cores.
416 If you don't have one of these, you should say N here.
Nick Piggin03b48632009-01-20 04:36:04 +0100417
Ingo Molnar6a485652009-01-27 18:29:13 +0100418config X86_VSMP
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800419 bool "ScaleMP vSMP"
Borislav Petkov6276a072013-03-04 21:20:21 +0100420 select HYPERVISOR_GUEST
Ingo Molnar6a485652009-01-27 18:29:13 +0100421 select PARAVIRT
422 depends on X86_64 && PCI
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800423 depends on X86_EXTENDED_PLATFORM
Shai Fultheimead91d42012-04-16 10:39:35 +0300424 depends on SMP
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100425 ---help---
Ingo Molnar6a485652009-01-27 18:29:13 +0100426 Support for ScaleMP vSMP systems. Say 'Y' here if this kernel is
427 supposed to run on these EM64T-based machines. Only choose this option
428 if you have one of these machines.
429
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800430config X86_UV
431 bool "SGI Ultraviolet"
432 depends on X86_64
433 depends on X86_EXTENDED_PLATFORM
Jack Steiner54c28d22009-04-03 15:39:42 -0500434 depends on NUMA
Suresh Siddha9d6c26e2009-04-20 13:02:31 -0700435 depends on X86_X2APIC
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800436 ---help---
437 This option is needed in order to support SGI Ultraviolet systems.
438 If you don't have one of these, you should say N here.
439
440# Following is an alphabetically sorted list of 32 bit extended platforms
441# Please maintain the alphabetic order if and when there are additions
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100442
Jun Nakajimaddd70cf2013-01-21 17:23:09 +0000443config X86_GOLDFISH
444 bool "Goldfish (Virtual Platform)"
Ben Hutchingscb7b8022013-06-24 01:05:25 +0100445 depends on X86_EXTENDED_PLATFORM
Jun Nakajimaddd70cf2013-01-21 17:23:09 +0000446 ---help---
447 Enable support for the Goldfish virtual platform used primarily
448 for Android development. Unless you are building for the Android
449 Goldfish emulator say N here.
450
Thomas Gleixnerc751e172010-11-09 12:08:04 -0800451config X86_INTEL_CE
452 bool "CE4100 TV platform"
453 depends on PCI
454 depends on PCI_GODIRECT
Jiang Liu6084a6e2014-06-09 16:19:46 +0800455 depends on X86_IO_APIC
Thomas Gleixnerc751e172010-11-09 12:08:04 -0800456 depends on X86_32
457 depends on X86_EXTENDED_PLATFORM
Dirk Brandewie37bc9f52010-11-09 12:08:08 -0800458 select X86_REBOOTFIXUPS
Sebastian Andrzej Siewiorda6b7372011-02-22 21:07:37 +0100459 select OF
460 select OF_EARLY_FLATTREE
Grant Likelyb4e51852011-12-16 15:50:17 -0700461 select IRQ_DOMAIN
Thomas Gleixnerc751e172010-11-09 12:08:04 -0800462 ---help---
463 Select for the Intel CE media processor (CE4100) SOC.
464 This option compiles in support for the CE4100 SOC for settop
465 boxes and media devices.
466
David Cohen4cb9b002013-12-16 17:37:26 -0800467config X86_INTEL_MID
Alan Cox43605ef2011-07-12 17:49:29 +0100468 bool "Intel MID platform support"
469 depends on X86_32
470 depends on X86_EXTENDED_PLATFORM
David Cohenedc6bc72014-01-21 10:41:39 -0800471 depends on X86_PLATFORM_DEVICES
Alan Cox1ea7c672011-11-10 13:29:14 +0000472 depends on PCI
473 depends on PCI_GOANY
474 depends on X86_IO_APIC
Alan Cox7c9c3a12011-12-29 14:43:16 +0000475 select SFI
David Cohen4cb9b002013-12-16 17:37:26 -0800476 select I2C
Alan Cox7c9c3a12011-12-29 14:43:16 +0000477 select DW_APB_TIMER
Alan Cox1ea7c672011-11-10 13:29:14 +0000478 select APB_TIMER
Alan Cox1ea7c672011-11-10 13:29:14 +0000479 select INTEL_SCU_IPC
Mika Westerberg15a713d2012-01-26 17:35:05 +0000480 select MFD_INTEL_MSIC
Alan Cox1ea7c672011-11-10 13:29:14 +0000481 ---help---
David Cohen4cb9b002013-12-16 17:37:26 -0800482 Select to build a kernel capable of supporting Intel MID (Mobile
483 Internet Device) platform systems which do not have the PCI legacy
484 interfaces. If you are building for a PC class system say N here.
Alan Cox1ea7c672011-11-10 13:29:14 +0000485
David Cohen4cb9b002013-12-16 17:37:26 -0800486 Intel MID platforms are based on an Intel processor and chipset which
487 consume less power than most of the x86 derivatives.
Alan Cox43605ef2011-07-12 17:49:29 +0100488
Bryan O'Donoghue8bbc2a12015-01-30 16:29:39 +0000489config X86_INTEL_QUARK
490 bool "Intel Quark platform support"
491 depends on X86_32
492 depends on X86_EXTENDED_PLATFORM
493 depends on X86_PLATFORM_DEVICES
494 depends on X86_TSC
495 depends on PCI
496 depends on PCI_GOANY
497 depends on X86_IO_APIC
498 select IOSF_MBI
499 select INTEL_IMR
Andy Shevchenko9ab6eb52015-03-05 17:24:04 +0200500 select COMMON_CLK
Bryan O'Donoghue8bbc2a12015-01-30 16:29:39 +0000501 ---help---
502 Select to include support for Quark X1000 SoC.
503 Say Y here if you have a Quark based system such as the Arduino
504 compatible Intel Galileo.
505
Mika Westerberg3d48aab2013-01-18 13:45:59 +0000506config X86_INTEL_LPSS
507 bool "Intel Low Power Subsystem Support"
508 depends on ACPI
509 select COMMON_CLK
Mathias Nyman0f531432013-09-13 17:02:29 +0300510 select PINCTRL
Mika Westerberg3d48aab2013-01-18 13:45:59 +0000511 ---help---
512 Select to build support for Intel Low Power Subsystem such as
513 found on Intel Lynxpoint PCH. Selecting this option enables
Mathias Nyman0f531432013-09-13 17:02:29 +0300514 things like clock tree (common clock framework) and pincontrol
515 which are needed by the LPSS peripheral drivers.
Mika Westerberg3d48aab2013-01-18 13:45:59 +0000516
Ken Xue92082a82015-02-06 08:27:51 +0800517config X86_AMD_PLATFORM_DEVICE
518 bool "AMD ACPI2Platform devices support"
519 depends on ACPI
520 select COMMON_CLK
521 select PINCTRL
522 ---help---
523 Select to interpret AMD specific ACPI device to platform device
524 such as I2C, UART, GPIO found on AMD Carrizo and later chipsets.
525 I2C and UART depend on COMMON_CLK to set clock. GPIO driver is
526 implemented under PINCTRL subsystem.
527
David E. Boxced3ce72014-09-17 22:13:50 -0700528config IOSF_MBI
529 tristate "Intel SoC IOSF Sideband support for SoC platforms"
530 depends on PCI
531 ---help---
532 This option enables sideband register access support for Intel SoC
533 platforms. On these platforms the IOSF sideband is used in lieu of
534 MSR's for some register accesses, mostly but not limited to thermal
535 and power. Drivers may query the availability of this device to
536 determine if they need the sideband in order to work on these
537 platforms. The sideband is available on the following SoC products.
538 This list is not meant to be exclusive.
539 - BayTrail
540 - Braswell
541 - Quark
542
543 You should say Y if you are running a kernel on one of these SoC's.
544
David E. Boxed2226b2014-09-17 22:13:51 -0700545config IOSF_MBI_DEBUG
546 bool "Enable IOSF sideband access through debugfs"
547 depends on IOSF_MBI && DEBUG_FS
548 ---help---
549 Select this option to expose the IOSF sideband access registers (MCR,
550 MDR, MCRX) through debugfs to write and read register information from
551 different units on the SoC. This is most useful for obtaining device
552 state information for debug and analysis. As this is a general access
553 mechanism, users of this option would have specific knowledge of the
554 device they want to access.
555
556 If you don't require the option or are in doubt, say N.
557
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800558config X86_RDC321X
559 bool "RDC R-321x SoC"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100560 depends on X86_32
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800561 depends on X86_EXTENDED_PLATFORM
562 select M486
563 select X86_REBOOTFIXUPS
564 ---help---
565 This option is needed for RDC R-321x system-on-chip, also known
566 as R-8610-(G).
567 If you don't have one of these chips, you should say N here.
568
Ingo Molnare0c7ae32009-01-27 18:43:09 +0100569config X86_32_NON_STANDARD
Ingo Molnar9c398012009-01-27 18:24:57 +0100570 bool "Support non-standard 32-bit SMP architectures"
571 depends on X86_32 && SMP
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800572 depends on X86_EXTENDED_PLATFORM
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100573 ---help---
H. Peter Anvinb5660ba2014-02-25 12:14:06 -0800574 This option compiles in the bigsmp and STA2X11 default
575 subarchitectures. It is intended for a generic binary
576 kernel. If you select them all, kernel will probe it one by
577 one and will fallback to default.
Yinghai Lud49c4282008-06-08 18:31:54 -0700578
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800579# Alphabetically sorted list of Non standard 32 bit platforms
Yinghai Lud49c4282008-06-08 18:31:54 -0700580
Linus Torvaldsd949f362009-09-26 09:35:07 -0700581config X86_SUPPORTS_MEMORY_FAILURE
Jan Beulich6fc108a2010-04-21 15:23:44 +0100582 def_bool y
Linus Torvaldsd949f362009-09-26 09:35:07 -0700583 # MCE code calls memory_failure():
584 depends on X86_MCE
585 # On 32-bit this adds too big of NODES_SHIFT and we run out of page flags:
Linus Torvaldsd949f362009-09-26 09:35:07 -0700586 # On 32-bit SPARSEMEM adds too big of SECTIONS_WIDTH:
587 depends on X86_64 || !SPARSEMEM
588 select ARCH_SUPPORTS_MEMORY_FAILURE
Linus Torvaldsd949f362009-09-26 09:35:07 -0700589
Alessandro Rubini83125a32012-04-04 19:40:21 +0200590config STA2X11
591 bool "STA2X11 Companion Chip Support"
592 depends on X86_32_NON_STANDARD && PCI
593 select X86_DEV_DMA_OPS
594 select X86_DMA_REMAP
595 select SWIOTLB
596 select MFD_STA2X11
597 select ARCH_REQUIRE_GPIOLIB
598 default n
599 ---help---
600 This adds support for boards based on the STA2X11 IO-Hub,
601 a.k.a. "ConneXt". The chip is used in place of the standard
602 PC chipset, so all "standard" peripherals are missing. If this
603 option is selected the kernel will still be able to boot on
604 standard PC machines.
605
Shérab82148d12010-09-25 06:06:57 +0200606config X86_32_IRIS
607 tristate "Eurobraille/Iris poweroff module"
608 depends on X86_32
609 ---help---
610 The Iris machines from EuroBraille do not have APM or ACPI support
611 to shut themselves down properly. A special I/O sequence is
612 needed to do so, which is what this module does at
613 kernel shutdown.
614
615 This is only for Iris machines from EuroBraille.
616
617 If unused, say N.
618
Ingo Molnarae1e9132008-11-11 09:05:16 +0100619config SCHED_OMIT_FRAME_POINTER
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100620 def_bool y
621 prompt "Single-depth WCHAN output"
Ken Chena87d0912008-11-06 11:10:49 -0800622 depends on X86
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100623 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100624 Calculate simpler /proc/<PID>/wchan values. If this option
625 is disabled then wchan values will recurse back to the
626 caller function. This provides more accurate wchan values,
627 at the expense of slightly more scheduling overhead.
628
629 If in doubt, say "Y".
630
Borislav Petkov6276a072013-03-04 21:20:21 +0100631menuconfig HYPERVISOR_GUEST
632 bool "Linux guest support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100633 ---help---
Borislav Petkov6276a072013-03-04 21:20:21 +0100634 Say Y here to enable options for running Linux under various hyper-
635 visors. This option enables basic hypervisor detection and platform
636 setup.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100637
Borislav Petkov6276a072013-03-04 21:20:21 +0100638 If you say N, all options in this submenu will be skipped and
639 disabled, and Linux guest support won't be built in.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100640
Borislav Petkov6276a072013-03-04 21:20:21 +0100641if HYPERVISOR_GUEST
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100642
Eduardo Pereira Habkoste61bd942008-01-30 13:33:32 +0100643config PARAVIRT
644 bool "Enable paravirtualization code"
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100645 ---help---
Eduardo Pereira Habkoste61bd942008-01-30 13:33:32 +0100646 This changes the kernel so it can modify itself when it is run
647 under a hypervisor, potentially improving performance significantly
648 over full virtualization. However, when run without a hypervisor
649 the kernel is theoretically slower and slightly larger.
650
Borislav Petkov6276a072013-03-04 21:20:21 +0100651config PARAVIRT_DEBUG
652 bool "paravirt-ops debugging"
653 depends on PARAVIRT && DEBUG_KERNEL
654 ---help---
655 Enable to debug paravirt_ops internals. Specifically, BUG if
656 a paravirt_op is missing when it is called.
657
Jeremy Fitzhardingeb4ecc122009-05-13 17:16:55 -0700658config PARAVIRT_SPINLOCKS
659 bool "Paravirtualization layer for spinlocks"
Kees Cook6ea30382012-10-02 11:16:47 -0700660 depends on PARAVIRT && SMP
Raghavendra K T8db73262013-08-09 19:51:50 +0530661 select UNINLINE_SPIN_UNLOCK
Jeremy Fitzhardingeb4ecc122009-05-13 17:16:55 -0700662 ---help---
663 Paravirtualized spinlocks allow a pvops backend to replace the
664 spinlock implementation with something virtualization-friendly
665 (for example, block the virtual CPU rather than spinning).
666
Raghavendra K T4c4e4f62013-10-21 21:35:08 +0530667 It has a minimal impact on native kernels and gives a nice performance
668 benefit on paravirtualized KVM / Xen kernels.
Jeremy Fitzhardingeb4ecc122009-05-13 17:16:55 -0700669
Raghavendra K T4c4e4f62013-10-21 21:35:08 +0530670 If you are unsure how to answer this question, answer Y.
Jeremy Fitzhardingeb4ecc122009-05-13 17:16:55 -0700671
Borislav Petkov6276a072013-03-04 21:20:21 +0100672source "arch/x86/xen/Kconfig"
673
674config KVM_GUEST
675 bool "KVM Guest support (including kvmclock)"
676 depends on PARAVIRT
677 select PARAVIRT_CLOCK
678 default y
679 ---help---
680 This option enables various optimizations for running under the KVM
681 hypervisor. It includes a paravirtualized clock, so that instead
682 of relying on a PIT (or probably other) emulation by the
683 underlying device model, the host provides the guest with
684 timing infrastructure such as time of day, and system time
685
Srivatsa Vaddagiri1e20eb82013-08-09 19:52:01 +0530686config KVM_DEBUG_FS
687 bool "Enable debug information for KVM Guests in debugfs"
688 depends on KVM_GUEST && DEBUG_FS
689 default n
690 ---help---
691 This option enables collection of various statistics for KVM guest.
692 Statistics are displayed in debugfs filesystem. Enabling this option
693 may incur significant overhead.
694
Borislav Petkov6276a072013-03-04 21:20:21 +0100695source "arch/x86/lguest/Kconfig"
696
697config PARAVIRT_TIME_ACCOUNTING
698 bool "Paravirtual steal time accounting"
699 depends on PARAVIRT
700 default n
701 ---help---
702 Select this option to enable fine granularity task steal time
703 accounting. Time spent executing other tasks in parallel with
704 the current vCPU is discounted from the vCPU power. To account for
705 that, there can be a small performance impact.
706
707 If in doubt, say N here.
708
Gerd Hoffmann7af192c2008-06-03 16:17:29 +0200709config PARAVIRT_CLOCK
710 bool
Gerd Hoffmann7af192c2008-06-03 16:17:29 +0200711
Borislav Petkov6276a072013-03-04 21:20:21 +0100712endif #HYPERVISOR_GUEST
Jeremy Fitzhardinge97349132008-06-25 00:19:14 -0400713
Yinghai Lu08677212010-02-10 01:20:20 -0800714config NO_BOOTMEM
Yinghai Lu774ea0b2010-08-25 13:39:18 -0700715 def_bool y
Yinghai Lu08677212010-02-10 01:20:20 -0800716
Yinghai Lu03273182008-04-18 17:49:15 -0700717config MEMTEST
718 bool "Memtest"
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100719 ---help---
Yinghai Luc64df702008-03-21 18:56:19 -0700720 This option adds a kernel parameter 'memtest', which allows memtest
Yinghai Lu03273182008-04-18 17:49:15 -0700721 to be set.
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100722 memtest=0, mean disabled; -- default
723 memtest=1, mean do 1 test pattern;
724 ...
725 memtest=4, mean do 4 test patterns.
Thomas Gleixneraba37282008-07-15 14:48:48 +0200726 If you are unsure how to answer this question, answer N.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100727
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100728source "arch/x86/Kconfig.cpu"
729
730config HPET_TIMER
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100731 def_bool X86_64
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100732 prompt "HPET Timer Support" if X86_32
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100733 ---help---
734 Use the IA-PC HPET (High Precision Event Timer) to manage
735 time in preference to the PIT and RTC, if a HPET is
736 present.
737 HPET is the next generation timer replacing legacy 8254s.
738 The HPET provides a stable time base on SMP
739 systems, unlike the TSC, but it is more expensive to access,
740 as it is off-chip. You can find the HPET spec at
741 <http://www.intel.com/hardwaredesign/hpetspec_1.pdf>.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100742
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100743 You can safely choose Y here. However, HPET will only be
744 activated if the platform and the BIOS support this feature.
745 Otherwise the 8254 will be used for timing services.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100746
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100747 Choose N to continue using the legacy 8254 timer.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100748
749config HPET_EMULATE_RTC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100750 def_bool y
Bernhard Walle9d8af782008-02-06 01:38:52 -0800751 depends on HPET_TIMER && (RTC=y || RTC=m || RTC_DRV_CMOS=m || RTC_DRV_CMOS=y)
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100752
Jacob Panbb24c472009-09-02 07:37:17 -0700753config APB_TIMER
Alan Cox933b9462011-12-17 17:43:40 +0000754 def_bool y if X86_INTEL_MID
755 prompt "Intel MID APB Timer Support" if X86_INTEL_MID
Jamie Iles06c3df42011-06-06 12:43:07 +0100756 select DW_APB_TIMER
Alan Coxa0c38322011-12-17 21:57:25 +0000757 depends on X86_INTEL_MID && SFI
Jacob Panbb24c472009-09-02 07:37:17 -0700758 help
759 APB timer is the replacement for 8254, HPET on X86 MID platforms.
760 The APBT provides a stable time base on SMP
761 systems, unlike the TSC, but it is more expensive to access,
762 as it is off-chip. APB timers are always running regardless of CPU
763 C states, they are used as per CPU clockevent device when possible.
764
David Rientjes6a108a12011-01-20 14:44:16 -0800765# Mark as expert because too many people got it wrong.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100766# The code disables itself when not needed.
Thomas Petazzoni7ae93922008-04-28 02:14:14 -0700767config DMI
768 default y
Ard Biesheuvelcf074402014-01-23 15:54:39 -0800769 select DMI_SCAN_MACHINE_NON_EFI_FALLBACK
David Rientjes6a108a12011-01-20 14:44:16 -0800770 bool "Enable DMI scanning" if EXPERT
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100771 ---help---
Thomas Petazzoni7ae93922008-04-28 02:14:14 -0700772 Enabled scanning of DMI to identify machine quirks. Say Y
773 here unless you have verified that your setup is not
774 affected by entries in the DMI blacklist. Required by PNP
775 BIOS code.
776
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100777config GART_IOMMU
Andi Kleen38901f12013-10-04 14:37:56 -0700778 bool "Old AMD GART IOMMU support"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100779 select SWIOTLB
Andreas Herrmann23ac4ae2010-09-17 18:03:43 +0200780 depends on X86_64 && PCI && AMD_NB
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100781 ---help---
Ingo Molnarced3c422013-10-06 11:45:20 +0200782 Provides a driver for older AMD Athlon64/Opteron/Turion/Sempron
783 GART based hardware IOMMUs.
784
785 The GART supports full DMA access for devices with 32-bit access
786 limitations, on systems with more than 3 GB. This is usually needed
787 for USB, sound, many IDE/SATA chipsets and some other devices.
788
789 Newer systems typically have a modern AMD IOMMU, supported via
790 the CONFIG_AMD_IOMMU=y config option.
791
792 In normal configurations this driver is only active when needed:
793 there's more than 3 GB of memory and the system contains a
794 32-bit limited device.
795
796 If unsure, say Y.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100797
798config CALGARY_IOMMU
799 bool "IBM Calgary IOMMU support"
800 select SWIOTLB
Kees Cook6ea30382012-10-02 11:16:47 -0700801 depends on X86_64 && PCI
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100802 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100803 Support for hardware IOMMUs in IBM's xSeries x366 and x460
804 systems. Needed to run systems with more than 3GB of memory
805 properly with 32-bit PCI devices that do not support DAC
806 (Double Address Cycle). Calgary also supports bus level
807 isolation, where all DMAs pass through the IOMMU. This
808 prevents them from going anywhere except their intended
809 destination. This catches hard-to-find kernel bugs and
810 mis-behaving drivers and devices that do not use the DMA-API
811 properly to set up their DMA buffers. The IOMMU can be
812 turned off at boot time with the iommu=off parameter.
813 Normally the kernel will make the right choice by itself.
814 If unsure, say Y.
815
816config CALGARY_IOMMU_ENABLED_BY_DEFAULT
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100817 def_bool y
818 prompt "Should Calgary be enabled by default?"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100819 depends on CALGARY_IOMMU
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100820 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100821 Should Calgary be enabled by default? if you choose 'y', Calgary
822 will be used (if it exists). If you choose 'n', Calgary will not be
823 used even if it exists. If you choose 'n' and would like to use
824 Calgary anyway, pass 'iommu=calgary' on the kernel command line.
825 If unsure, say Y.
826
827# need this always selected by IOMMU for the VIA workaround
828config SWIOTLB
Joerg Roedela1afd012008-11-18 12:44:21 +0100829 def_bool y if X86_64
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100830 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100831 Support for software bounce buffers used on x86-64 systems
Joe Millenbach4454d322012-09-02 17:38:20 -0700832 which don't have a hardware IOMMU. Using this PCI devices
833 which can only access 32-bits of memory can be used on systems
834 with more than 3 GB of memory.
835 If unsure, say Y.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100836
FUJITA Tomonoria8522502008-04-29 00:59:36 -0700837config IOMMU_HELPER
Jan Beulich3120e252012-09-10 12:41:45 +0100838 def_bool y
839 depends on CALGARY_IOMMU || GART_IOMMU || SWIOTLB || AMD_IOMMU
Linus Torvaldsd25e26b2008-08-25 14:15:38 -0700840
Mike Travis1184dc22008-05-12 21:21:12 +0200841config MAXSMP
Samuel Thibaultddb0c5a2010-08-21 21:32:41 +0200842 bool "Enable Maximum number of SMP Processors and NUMA Nodes"
Kees Cook6ea30382012-10-02 11:16:47 -0700843 depends on X86_64 && SMP && DEBUG_KERNEL
Mike Travis36f51012008-12-16 17:33:51 -0800844 select CPUMASK_OFFSTACK
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100845 ---help---
Samuel Thibaultddb0c5a2010-08-21 21:32:41 +0200846 Enable maximum number of CPUS and NUMA Nodes for this architecture.
Mike Travis1184dc22008-05-12 21:21:12 +0200847 If unsure, say N.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100848
849config NR_CPUS
Mike Travis36f51012008-12-16 17:33:51 -0800850 int "Maximum number of CPUs" if SMP && !MAXSMP
Michael K. Johnson2a3313f2009-04-21 21:44:48 -0400851 range 2 8 if SMP && X86_32 && !X86_BIGSMP
Josh Boyerbb61ccc2013-11-05 09:37:29 -0500852 range 2 512 if SMP && !MAXSMP && !CPUMASK_OFFSTACK
Josh Boyerb53b5ed2013-11-05 09:38:16 -0500853 range 2 8192 if SMP && !MAXSMP && CPUMASK_OFFSTACK && X86_64
Mike Travis78637a972008-12-16 17:34:00 -0800854 default "1" if !SMP
Josh Boyerb53b5ed2013-11-05 09:38:16 -0500855 default "8192" if MAXSMP
H. Peter Anvinb5660ba2014-02-25 12:14:06 -0800856 default "32" if SMP && X86_BIGSMP
Mike Travis78637a972008-12-16 17:34:00 -0800857 default "8" if SMP
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100858 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100859 This allows you to specify the maximum number of CPUs which this
Josh Boyerbb61ccc2013-11-05 09:37:29 -0500860 kernel will support. If CPUMASK_OFFSTACK is enabled, the maximum
861 supported value is 4096, otherwise the maximum value is 512. The
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100862 minimum value which makes sense is 2.
863
864 This is purely to save memory - each supported CPU adds
865 approximately eight kilobytes to the kernel image.
866
867config SCHED_SMT
868 bool "SMT (Hyperthreading) scheduler support"
Hiroshi Shimamotob089c122008-02-27 13:16:30 -0800869 depends on X86_HT
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100870 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100871 SMT scheduler support improves the CPU scheduler's decision making
872 when dealing with Intel Pentium 4 chips with HyperThreading at a
873 cost of slightly increased overhead in some places. If unsure say
874 N here.
875
876config SCHED_MC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100877 def_bool y
878 prompt "Multi-core scheduler support"
Hiroshi Shimamotob089c122008-02-27 13:16:30 -0800879 depends on X86_HT
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100880 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100881 Multi-core scheduler support improves the CPU scheduler's decision
882 making when dealing with multi-core CPU chips at a cost of slightly
883 increased overhead in some places. If unsure say N here.
884
885source "kernel/Kconfig.preempt"
886
Thomas Gleixner30b8b002015-01-15 21:22:39 +0000887config UP_LATE_INIT
888 def_bool y
Thomas Gleixnerba360f8872015-01-24 10:34:46 +0100889 depends on !SMP && X86_LOCAL_APIC
Thomas Gleixner30b8b002015-01-15 21:22:39 +0000890
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100891config X86_UP_APIC
Jan Beulich50849ee2015-02-05 15:31:56 +0000892 bool "Local APIC support on uniprocessors" if !PCI_MSI
893 default PCI_MSI
Bryan O'Donoghue38a1dfd2015-01-22 22:58:49 +0000894 depends on X86_32 && !SMP && !X86_32_NON_STANDARD
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100895 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100896 A local APIC (Advanced Programmable Interrupt Controller) is an
897 integrated interrupt controller in the CPU. If you have a single-CPU
898 system which has a processor with a local APIC, you can say Y here to
899 enable and use it. If you say Y here even though your machine doesn't
900 have a local APIC, then the kernel will still run with no slowdown at
901 all. The local APIC supports CPU-generated self-interrupts (timer,
902 performance counters), and the NMI watchdog which detects hard
903 lockups.
904
905config X86_UP_IOAPIC
906 bool "IO-APIC support on uniprocessors"
907 depends on X86_UP_APIC
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100908 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100909 An IO-APIC (I/O Advanced Programmable Interrupt Controller) is an
910 SMP-capable replacement for PC-style interrupt controllers. Most
911 SMP systems and many recent uniprocessor systems have one.
912
913 If you have a single-CPU system with an IO-APIC, you can say Y here
914 to use it. If you say Y here even though your machine doesn't have
915 an IO-APIC, then the kernel will still run with no slowdown at all.
916
917config X86_LOCAL_APIC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100918 def_bool y
Thomas Petazzoni0dbc6072013-10-03 11:59:14 +0200919 depends on X86_64 || SMP || X86_32_NON_STANDARD || X86_UP_APIC || PCI_MSI
Jiang Liu74afab72014-10-27 16:12:00 +0800920 select GENERIC_IRQ_LEGACY_ALLOC_HWIRQ
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100921
922config X86_IO_APIC
Jan Beulichb1da1e72015-02-05 15:35:21 +0000923 def_bool y
924 depends on X86_LOCAL_APIC || X86_UP_IOAPIC
Jiang Liud7f3d472014-06-09 16:19:52 +0800925 select IRQ_DOMAIN
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100926
Stefan Assmann41b9eb22008-07-15 13:48:55 +0200927config X86_REROUTE_FOR_BROKEN_BOOT_IRQS
928 bool "Reroute for broken boot IRQs"
Stefan Assmann41b9eb22008-07-15 13:48:55 +0200929 depends on X86_IO_APIC
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100930 ---help---
Stefan Assmann41b9eb22008-07-15 13:48:55 +0200931 This option enables a workaround that fixes a source of
932 spurious interrupts. This is recommended when threaded
933 interrupt handling is used on systems where the generation of
934 superfluous "boot interrupts" cannot be disabled.
935
936 Some chipsets generate a legacy INTx "boot IRQ" when the IRQ
937 entry in the chipset's IO-APIC is masked (as, e.g. the RT
938 kernel does during interrupt handling). On chipsets where this
939 boot IRQ generation cannot be disabled, this workaround keeps
940 the original IRQ line masked so that only the equivalent "boot
941 IRQ" is delivered to the CPUs. The workaround also tells the
942 kernel to set up the IRQ handler on the boot IRQ line. In this
943 way only one interrupt is delivered to the kernel. Otherwise
944 the spurious second interrupt may cause the kernel to bring
945 down (vital) interrupt lines.
946
947 Only affects "broken" chipsets. Interrupt sharing may be
948 increased on these systems.
949
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100950config X86_MCE
Andi Kleenbab9bc62009-07-09 00:31:38 +0200951 bool "Machine Check / overheating reporting"
Borislav Petkove57dbaf2011-09-13 15:23:21 +0200952 default y
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100953 ---help---
Andi Kleenbab9bc62009-07-09 00:31:38 +0200954 Machine Check support allows the processor to notify the
955 kernel if it detects a problem (e.g. overheating, data corruption).
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100956 The action the kernel takes depends on the severity of the problem,
Andi Kleenbab9bc62009-07-09 00:31:38 +0200957 ranging from warning messages to halting the machine.
Andi Kleen4efc0672009-04-28 19:07:31 +0200958
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100959config X86_MCE_INTEL
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100960 def_bool y
961 prompt "Intel MCE features"
Andi Kleenc1ebf832009-07-09 00:31:41 +0200962 depends on X86_MCE && X86_LOCAL_APIC
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100963 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100964 Additional support for intel specific MCE features such as
965 the thermal monitor.
966
967config X86_MCE_AMD
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100968 def_bool y
969 prompt "AMD MCE features"
Andi Kleenc1ebf832009-07-09 00:31:41 +0200970 depends on X86_MCE && X86_LOCAL_APIC
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100971 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100972 Additional support for AMD specific MCE features such as
973 the DRAM Error Threshold.
974
Andi Kleen4efc0672009-04-28 19:07:31 +0200975config X86_ANCIENT_MCE
Jan Beulich6fc108a2010-04-21 15:23:44 +0100976 bool "Support for old Pentium 5 / WinChip machine checks"
Andi Kleenc31d9632009-07-09 00:31:37 +0200977 depends on X86_32 && X86_MCE
Hidetoshi Setocd13adcc2009-05-27 16:57:31 +0900978 ---help---
979 Include support for machine check handling on old Pentium 5 or WinChip
Masanari Iida5065a702013-11-30 21:38:43 +0900980 systems. These typically need to be enabled explicitly on the command
Hidetoshi Setocd13adcc2009-05-27 16:57:31 +0900981 line.
Andi Kleen4efc0672009-04-28 19:07:31 +0200982
Andi Kleenb2762682009-02-12 13:49:31 +0100983config X86_MCE_THRESHOLD
984 depends on X86_MCE_AMD || X86_MCE_INTEL
Jan Beulich6fc108a2010-04-21 15:23:44 +0100985 def_bool y
Andi Kleenb2762682009-02-12 13:49:31 +0100986
Andi Kleenea149b32009-04-29 19:31:00 +0200987config X86_MCE_INJECT
Andi Kleenc1ebf832009-07-09 00:31:41 +0200988 depends on X86_MCE
Andi Kleenea149b32009-04-29 19:31:00 +0200989 tristate "Machine check injector support"
990 ---help---
991 Provide support for injecting machine checks for testing purposes.
992 If you don't know what a machine check is and you don't do kernel
993 QA it is safe to say n.
994
Andi Kleen4efc0672009-04-28 19:07:31 +0200995config X86_THERMAL_VECTOR
996 def_bool y
Andi Kleen5bb38ad2009-07-09 00:31:39 +0200997 depends on X86_MCE_INTEL
Andi Kleen4efc0672009-04-28 19:07:31 +0200998
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100999config VM86
David Rientjes6a108a12011-01-20 14:44:16 -08001000 bool "Enable VM86 support" if EXPERT
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001001 default y
1002 depends on X86_32
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001003 ---help---
H. Peter Anvin34273f42014-05-04 10:36:22 -07001004 This option is required by programs like DOSEMU to run
1005 16-bit real mode legacy code on x86 processors. It also may
1006 be needed by software like XFree86 to initialize some video
1007 cards via BIOS. Disabling this option saves about 6K.
1008
1009config X86_16BIT
1010 bool "Enable support for 16-bit segments" if EXPERT
1011 default y
1012 ---help---
1013 This option is required by programs like Wine to run 16-bit
1014 protected mode legacy code on x86 processors. Disabling
1015 this option saves about 300 bytes on i386, or around 6K text
1016 plus 16K runtime memory on x86-64,
1017
1018config X86_ESPFIX32
1019 def_bool y
1020 depends on X86_16BIT && X86_32
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001021
H. Peter Anvin197725d2014-05-04 10:00:49 -07001022config X86_ESPFIX64
1023 def_bool y
H. Peter Anvin34273f42014-05-04 10:36:22 -07001024 depends on X86_16BIT && X86_64
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001025
Andy Lutomirski1ad83c82014-10-29 14:33:47 -07001026config X86_VSYSCALL_EMULATION
1027 bool "Enable vsyscall emulation" if EXPERT
1028 default y
1029 depends on X86_64
1030 ---help---
1031 This enables emulation of the legacy vsyscall page. Disabling
1032 it is roughly equivalent to booting with vsyscall=none, except
1033 that it will also disable the helpful warning if a program
1034 tries to use a vsyscall. With this option set to N, offending
1035 programs will just segfault, citing addresses of the form
1036 0xffffffffff600?00.
1037
1038 This option is required by many programs built before 2013, and
1039 care should be used even with newer programs if set to N.
1040
1041 Disabling this option saves about 7K of kernel size and
1042 possibly 4K of additional runtime pagetable memory.
1043
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001044config TOSHIBA
1045 tristate "Toshiba Laptop support"
1046 depends on X86_32
1047 ---help---
1048 This adds a driver to safely access the System Management Mode of
1049 the CPU on Toshiba portables with a genuine Toshiba BIOS. It does
1050 not work on models with a Phoenix BIOS. The System Management Mode
1051 is used to set the BIOS and power saving options on Toshiba portables.
1052
1053 For information on utilities to make use of this driver see the
1054 Toshiba Linux utilities web site at:
1055 <http://www.buzzard.org.uk/toshiba/>.
1056
1057 Say Y if you intend to run this kernel on a Toshiba portable.
1058 Say N otherwise.
1059
1060config I8K
1061 tristate "Dell laptop support"
Jean Delvare949a9d72011-05-25 20:43:33 +02001062 select HWMON
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001063 ---help---
1064 This adds a driver to safely access the System Management Mode
1065 of the CPU on the Dell Inspiron 8000. The System Management Mode
1066 is used to read cpu temperature and cooling fan status and to
1067 control the fans on the I8K portables.
1068
1069 This driver has been tested only on the Inspiron 8000 but it may
1070 also work with other Dell laptops. You can force loading on other
1071 models by passing the parameter `force=1' to the module. Use at
1072 your own risk.
1073
1074 For information on utilities to make use of this driver see the
1075 I8K Linux utilities web site at:
1076 <http://people.debian.org/~dz/i8k/>
1077
1078 Say Y if you intend to run this kernel on a Dell Inspiron 8000.
1079 Say N otherwise.
1080
1081config X86_REBOOTFIXUPS
Jan Beulich9ba16082008-10-15 22:01:38 -07001082 bool "Enable X86 board specific fixups for reboot"
1083 depends on X86_32
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001084 ---help---
1085 This enables chipset and/or board specific fixups to be done
1086 in order to get reboot to work correctly. This is only needed on
1087 some combinations of hardware and BIOS. The symptom, for which
1088 this config is intended, is when reboot ends with a stalled/hung
1089 system.
1090
1091 Currently, the only fixup is for the Geode machines using
Florian Fainelli5e3a77e2008-01-30 13:33:36 +01001092 CS5530A and CS5536 chipsets and the RDC R-321x SoC.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001093
1094 Say Y if you want to enable the fixup. Currently, it's safe to
1095 enable this option even if you don't need it.
1096 Say N otherwise.
1097
1098config MICROCODE
Borislav Petkove43f6e62012-08-01 19:17:01 +02001099 tristate "CPU microcode loading support"
Borislav Petkov80030e32013-10-13 18:36:29 +02001100 depends on CPU_SUP_AMD || CPU_SUP_INTEL
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001101 select FW_LOADER
1102 ---help---
Borislav Petkove43f6e62012-08-01 19:17:01 +02001103
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001104 If you say Y here, you will be able to update the microcode on
Peter Oruba80cc9f12008-07-28 18:44:22 +02001105 certain Intel and AMD processors. The Intel support is for the
Borislav Petkove43f6e62012-08-01 19:17:01 +02001106 IA32 family, e.g. Pentium Pro, Pentium II, Pentium III, Pentium 4,
1107 Xeon etc. The AMD support is for families 0x10 and later. You will
1108 obviously need the actual microcode binary data itself which is not
1109 shipped with the Linux kernel.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001110
Peter Oruba8d86f392008-07-28 18:44:21 +02001111 This option selects the general module only, you need to select
1112 at least one vendor specific module as well.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001113
Borislav Petkove43f6e62012-08-01 19:17:01 +02001114 To compile this driver as a module, choose M here: the module
1115 will be called microcode.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001116
Peter Oruba8d86f392008-07-28 18:44:21 +02001117config MICROCODE_INTEL
Borislav Petkove43f6e62012-08-01 19:17:01 +02001118 bool "Intel microcode loading support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001119 depends on MICROCODE
1120 default MICROCODE
1121 select FW_LOADER
1122 ---help---
1123 This options enables microcode patch loading support for Intel
1124 processors.
Peter Oruba8d86f392008-07-28 18:44:21 +02001125
Alanb8989db2014-01-20 18:01:56 +00001126 For the current Intel microcode data package go to
1127 <https://downloadcenter.intel.com> and search for
1128 'Linux Processor Microcode Data File'.
Peter Oruba8d86f392008-07-28 18:44:21 +02001129
Peter Oruba80cc9f12008-07-28 18:44:22 +02001130config MICROCODE_AMD
Borislav Petkove43f6e62012-08-01 19:17:01 +02001131 bool "AMD microcode loading support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001132 depends on MICROCODE
1133 select FW_LOADER
1134 ---help---
1135 If you select this option, microcode patch loading support for AMD
1136 processors will be enabled.
Peter Oruba80cc9f12008-07-28 18:44:22 +02001137
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001138config MICROCODE_OLD_INTERFACE
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001139 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001140 depends on MICROCODE
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001141
Fenghua Yuda76f642012-12-20 23:44:32 -08001142config MICROCODE_INTEL_EARLY
Jan Beuliche0fd24a2015-02-05 15:39:34 +00001143 bool
Jacob Shin757885e2013-05-30 14:09:19 -05001144
1145config MICROCODE_AMD_EARLY
Jan Beuliche0fd24a2015-02-05 15:39:34 +00001146 bool
Jacob Shin757885e2013-05-30 14:09:19 -05001147
1148config MICROCODE_EARLY
Fenghua Yuda76f642012-12-20 23:44:32 -08001149 bool "Early load microcode"
Jacob Shin6b3389a2013-05-31 01:53:24 -05001150 depends on MICROCODE=y && BLK_DEV_INITRD
Jacob Shin757885e2013-05-30 14:09:19 -05001151 select MICROCODE_INTEL_EARLY if MICROCODE_INTEL
1152 select MICROCODE_AMD_EARLY if MICROCODE_AMD
Fenghua Yuda76f642012-12-20 23:44:32 -08001153 default y
1154 help
1155 This option provides functionality to read additional microcode data
1156 at the beginning of initrd image. The data tells kernel to load
1157 microcode to CPU's as early as possible. No functional change if no
1158 microcode data is glued to the initrd, therefore it's safe to say Y.
1159
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001160config X86_MSR
1161 tristate "/dev/cpu/*/msr - Model-specific register support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001162 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001163 This device gives privileged processes access to the x86
1164 Model-Specific Registers (MSRs). It is a character device with
1165 major 202 and minors 0 to 31 for /dev/cpu/0/msr to /dev/cpu/31/msr.
1166 MSR accesses are directed to a specific CPU on multi-processor
1167 systems.
1168
1169config X86_CPUID
1170 tristate "/dev/cpu/*/cpuid - CPU information support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001171 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001172 This device gives processes access to the x86 CPUID instruction to
1173 be executed on a specific processor. It is a character device
1174 with major 203 and minors 0 to 31 for /dev/cpu/0/cpuid to
1175 /dev/cpu/31/cpuid.
1176
1177choice
1178 prompt "High Memory Support"
Jan Beulich6fc108a2010-04-21 15:23:44 +01001179 default HIGHMEM4G
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001180 depends on X86_32
1181
1182config NOHIGHMEM
1183 bool "off"
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001184 ---help---
1185 Linux can use up to 64 Gigabytes of physical memory on x86 systems.
1186 However, the address space of 32-bit x86 processors is only 4
1187 Gigabytes large. That means that, if you have a large amount of
1188 physical memory, not all of it can be "permanently mapped" by the
1189 kernel. The physical memory that's not permanently mapped is called
1190 "high memory".
1191
1192 If you are compiling a kernel which will never run on a machine with
1193 more than 1 Gigabyte total physical RAM, answer "off" here (default
1194 choice and suitable for most users). This will result in a "3GB/1GB"
1195 split: 3GB are mapped so that each process sees a 3GB virtual memory
1196 space and the remaining part of the 4GB virtual memory space is used
1197 by the kernel to permanently map as much physical memory as
1198 possible.
1199
1200 If the machine has between 1 and 4 Gigabytes physical RAM, then
1201 answer "4GB" here.
1202
1203 If more than 4 Gigabytes is used then answer "64GB" here. This
1204 selection turns Intel PAE (Physical Address Extension) mode on.
1205 PAE implements 3-level paging on IA32 processors. PAE is fully
1206 supported by Linux, PAE mode is implemented on all recent Intel
1207 processors (Pentium Pro and better). NOTE: If you say "64GB" here,
1208 then the kernel will not boot on CPUs that don't support PAE!
1209
1210 The actual amount of total physical memory will either be
1211 auto detected or can be forced by using a kernel command line option
1212 such as "mem=256M". (Try "man bootparam" or see the documentation of
1213 your boot loader (lilo or loadlin) about how to pass options to the
1214 kernel at boot time.)
1215
1216 If unsure, say "off".
1217
1218config HIGHMEM4G
1219 bool "4GB"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001220 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001221 Select this if you have a 32-bit processor and between 1 and 4
1222 gigabytes of physical RAM.
1223
1224config HIGHMEM64G
1225 bool "64GB"
H. Peter Anvineb068e72012-11-28 11:50:23 -08001226 depends on !M486
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001227 select X86_PAE
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001228 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001229 Select this if you have a 32-bit processor and more than 4
1230 gigabytes of physical RAM.
1231
1232endchoice
1233
1234choice
David Rientjes6a108a12011-01-20 14:44:16 -08001235 prompt "Memory split" if EXPERT
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001236 default VMSPLIT_3G
1237 depends on X86_32
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001238 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001239 Select the desired split between kernel and user memory.
1240
1241 If the address range available to the kernel is less than the
1242 physical memory installed, the remaining memory will be available
1243 as "high memory". Accessing high memory is a little more costly
1244 than low memory, as it needs to be mapped into the kernel first.
1245 Note that increasing the kernel address space limits the range
1246 available to user programs, making the address space there
1247 tighter. Selecting anything other than the default 3G/1G split
1248 will also likely make your kernel incompatible with binary-only
1249 kernel modules.
1250
1251 If you are not absolutely sure what you are doing, leave this
1252 option alone!
1253
1254 config VMSPLIT_3G
1255 bool "3G/1G user/kernel split"
1256 config VMSPLIT_3G_OPT
1257 depends on !X86_PAE
1258 bool "3G/1G user/kernel split (for full 1G low memory)"
1259 config VMSPLIT_2G
1260 bool "2G/2G user/kernel split"
1261 config VMSPLIT_2G_OPT
1262 depends on !X86_PAE
1263 bool "2G/2G user/kernel split (for full 2G low memory)"
1264 config VMSPLIT_1G
1265 bool "1G/3G user/kernel split"
1266endchoice
1267
1268config PAGE_OFFSET
1269 hex
1270 default 0xB0000000 if VMSPLIT_3G_OPT
1271 default 0x80000000 if VMSPLIT_2G
1272 default 0x78000000 if VMSPLIT_2G_OPT
1273 default 0x40000000 if VMSPLIT_1G
1274 default 0xC0000000
1275 depends on X86_32
1276
1277config HIGHMEM
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001278 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001279 depends on X86_32 && (HIGHMEM64G || HIGHMEM4G)
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001280
1281config X86_PAE
Jan Beulich9ba16082008-10-15 22:01:38 -07001282 bool "PAE (Physical Address Extension) Support"
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001283 depends on X86_32 && !HIGHMEM4G
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001284 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001285 PAE is required for NX support, and furthermore enables
1286 larger swapspace support for non-overcommit purposes. It
1287 has the cost of more pagetable lookup overhead, and also
1288 consumes more pagetable space per process.
1289
Jeremy Fitzhardinge600715d2008-09-11 01:31:45 -07001290config ARCH_PHYS_ADDR_T_64BIT
Jan Beulich3120e252012-09-10 12:41:45 +01001291 def_bool y
1292 depends on X86_64 || X86_PAE
Jeremy Fitzhardinge600715d2008-09-11 01:31:45 -07001293
FUJITA Tomonori66f2b062010-10-20 15:55:35 -07001294config ARCH_DMA_ADDR_T_64BIT
Jan Beulich3120e252012-09-10 12:41:45 +01001295 def_bool y
1296 depends on X86_64 || HIGHMEM64G
FUJITA Tomonori66f2b062010-10-20 15:55:35 -07001297
Ingo Molnar10971ab2015-03-05 08:18:23 +01001298config X86_DIRECT_GBPAGES
Luis R. Rodrigueze5008ab2015-03-04 17:24:12 -08001299 def_bool y
1300 depends on X86_64 && !DEBUG_PAGEALLOC && !KMEMCHECK
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001301 ---help---
Ingo Molnar10971ab2015-03-05 08:18:23 +01001302 Certain kernel features effectively disable kernel
1303 linear 1 GB mappings (even if the CPU otherwise
1304 supports them), so don't confuse the user by printing
1305 that we have them enabled.
Nick Piggin9e899812008-10-22 12:33:16 +02001306
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001307# Common NUMA Features
1308config NUMA
KOSAKI Motohirofd51b2d2008-11-05 02:27:19 +09001309 bool "Numa Memory Allocation and Scheduler Support"
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001310 depends on SMP
H. Peter Anvinb5660ba2014-02-25 12:14:06 -08001311 depends on X86_64 || (X86_32 && HIGHMEM64G && X86_BIGSMP)
1312 default y if X86_BIGSMP
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001313 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001314 Enable NUMA (Non Uniform Memory Access) support.
KOSAKI Motohirofd51b2d2008-11-05 02:27:19 +09001315
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001316 The kernel will try to allocate memory used by a CPU on the
1317 local memory controller of the CPU and add some more
1318 NUMA awareness to the kernel.
1319
Ingo Molnarc280ea52008-11-08 13:29:45 +01001320 For 64-bit this is recommended if the system is Intel Core i7
KOSAKI Motohirofd51b2d2008-11-05 02:27:19 +09001321 (or later), AMD Opteron, or EM64T NUMA.
1322
H. Peter Anvinb5660ba2014-02-25 12:14:06 -08001323 For 32-bit this is only needed if you boot a 32-bit
David Rientjes7cf6c942014-02-11 18:11:13 -08001324 kernel on a 64-bit NUMA platform.
KOSAKI Motohirofd51b2d2008-11-05 02:27:19 +09001325
1326 Otherwise, you should say N.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001327
Hans Rosenfeldeec1d4f2010-10-29 17:14:30 +02001328config AMD_NUMA
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001329 def_bool y
1330 prompt "Old style AMD Opteron NUMA detection"
Tejun Heo5da0ef92011-07-11 10:34:32 +02001331 depends on X86_64 && NUMA && PCI
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001332 ---help---
Hans Rosenfeldeec1d4f2010-10-29 17:14:30 +02001333 Enable AMD NUMA node topology detection. You should say Y here if
1334 you have a multi processor AMD system. This uses an old method to
1335 read the NUMA configuration directly from the builtin Northbridge
1336 of Opteron. It is recommended to use X86_64_ACPI_NUMA instead,
1337 which also takes priority if both are compiled in.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001338
1339config X86_64_ACPI_NUMA
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001340 def_bool y
1341 prompt "ACPI NUMA detection"
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001342 depends on X86_64 && NUMA && ACPI && PCI
1343 select ACPI_NUMA
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001344 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001345 Enable ACPI SRAT based node topology detection.
1346
Suresh Siddha6ec6e0d2008-03-25 10:14:35 -07001347# Some NUMA nodes have memory ranges that span
1348# other nodes. Even though a pfn is valid and
1349# between a node's start and end pfns, it may not
1350# reside on that node. See memmap_init_zone()
1351# for details.
1352config NODES_SPAN_OTHER_NODES
1353 def_bool y
1354 depends on X86_64_ACPI_NUMA
1355
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001356config NUMA_EMU
1357 bool "NUMA emulation"
Tejun Heo1b7e03e2011-05-02 17:24:48 +02001358 depends on NUMA
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001359 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001360 Enable NUMA emulation. A flat machine will be split
1361 into virtual nodes when booted with "numa=fake=N", where N is the
1362 number of nodes. This is only useful for debugging.
1363
1364config NODES_SHIFT
Linus Torvaldsd25e26b2008-08-25 14:15:38 -07001365 int "Maximum NUMA Nodes (as a power of 2)" if !MAXSMP
David Rientjes51591e32010-03-25 15:39:27 -07001366 range 1 10
1367 default "10" if MAXSMP
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001368 default "6" if X86_64
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001369 default "3"
1370 depends on NEED_MULTIPLE_NODES
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001371 ---help---
Mike Travis1184dc22008-05-12 21:21:12 +02001372 Specify the maximum number of NUMA Nodes available on the target
Matt LaPlante692105b2009-01-26 11:12:25 +01001373 system. Increases memory reserved to accommodate various tables.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001374
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001375config ARCH_HAVE_MEMORY_PRESENT
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001376 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001377 depends on X86_32 && DISCONTIGMEM
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001378
1379config NEED_NODE_MEMMAP_SIZE
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001380 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001381 depends on X86_32 && (DISCONTIGMEM || SPARSEMEM)
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001382
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001383config ARCH_FLATMEM_ENABLE
1384 def_bool y
Tejun Heo3b166512011-04-01 11:15:12 +02001385 depends on X86_32 && !NUMA
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001386
1387config ARCH_DISCONTIGMEM_ENABLE
1388 def_bool y
Christoph Lameterb2632952008-01-30 13:30:47 +01001389 depends on NUMA && X86_32
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001390
1391config ARCH_DISCONTIGMEM_DEFAULT
1392 def_bool y
Christoph Lameterb2632952008-01-30 13:30:47 +01001393 depends on NUMA && X86_32
1394
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001395config ARCH_SPARSEMEM_ENABLE
1396 def_bool y
Kees Cook6ea30382012-10-02 11:16:47 -07001397 depends on X86_64 || NUMA || X86_32 || X86_32_NON_STANDARD
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001398 select SPARSEMEM_STATIC if X86_32
1399 select SPARSEMEM_VMEMMAP_ENABLE if X86_64
1400
Tejun Heo3b166512011-04-01 11:15:12 +02001401config ARCH_SPARSEMEM_DEFAULT
1402 def_bool y
1403 depends on X86_64
1404
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001405config ARCH_SELECT_MEMORY_MODEL
1406 def_bool y
Christoph Lameterb2632952008-01-30 13:30:47 +01001407 depends on ARCH_SPARSEMEM_ENABLE
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001408
1409config ARCH_MEMORY_PROBE
Toshi Kania0842b72013-07-19 11:47:48 -06001410 bool "Enable sysfs memory/probe interface"
Jan Beulich3120e252012-09-10 12:41:45 +01001411 depends on X86_64 && MEMORY_HOTPLUG
Toshi Kania0842b72013-07-19 11:47:48 -06001412 help
1413 This option enables a sysfs memory/probe interface for testing.
1414 See Documentation/memory-hotplug.txt for more information.
1415 If you are unsure how to answer this question, answer N.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001416
Tejun Heo3b166512011-04-01 11:15:12 +02001417config ARCH_PROC_KCORE_TEXT
1418 def_bool y
1419 depends on X86_64 && PROC_KCORE
1420
Avi Kivitya29815a2010-01-10 16:28:09 +02001421config ILLEGAL_POINTER_VALUE
1422 hex
1423 default 0 if X86_32
1424 default 0xdead000000000000 if X86_64
1425
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001426source "mm/Kconfig"
1427
1428config HIGHPTE
1429 bool "Allocate 3rd-level pagetables from highmem"
Jan Beulich6fc108a2010-04-21 15:23:44 +01001430 depends on HIGHMEM
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001431 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001432 The VM uses one page table entry for each page of physical memory.
1433 For systems with a lot of RAM, this can be wasteful of precious
1434 low memory. Setting this option will put user-space page table
1435 entries in high memory.
1436
Jeremy Fitzhardinge9f077872008-09-07 01:51:34 -07001437config X86_CHECK_BIOS_CORRUPTION
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001438 bool "Check for low memory corruption"
1439 ---help---
1440 Periodically check for memory corruption in low memory, which
1441 is suspected to be caused by BIOS. Even when enabled in the
1442 configuration, it is disabled at runtime. Enable it by
1443 setting "memory_corruption_check=1" on the kernel command
1444 line. By default it scans the low 64k of memory every 60
1445 seconds; see the memory_corruption_check_size and
1446 memory_corruption_check_period parameters in
1447 Documentation/kernel-parameters.txt to adjust this.
Jeremy Fitzhardinge9f077872008-09-07 01:51:34 -07001448
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001449 When enabled with the default parameters, this option has
1450 almost no overhead, as it reserves a relatively small amount
1451 of memory and scans it infrequently. It both detects corruption
1452 and prevents it from affecting the running system.
Jeremy Fitzhardinge9f077872008-09-07 01:51:34 -07001453
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001454 It is, however, intended as a diagnostic tool; if repeatable
1455 BIOS-originated corruption always affects the same memory,
1456 you can use memmap= to prevent the kernel from using that
1457 memory.
Jeremy Fitzhardinge9f077872008-09-07 01:51:34 -07001458
Jeremy Fitzhardingec885df52008-09-07 02:37:32 -07001459config X86_BOOTPARAM_MEMORY_CORRUPTION_CHECK
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001460 bool "Set the default setting of memory_corruption_check"
Jeremy Fitzhardingec885df52008-09-07 02:37:32 -07001461 depends on X86_CHECK_BIOS_CORRUPTION
1462 default y
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001463 ---help---
1464 Set whether the default state of memory_corruption_check is
1465 on or off.
Jeremy Fitzhardingec885df52008-09-07 02:37:32 -07001466
H. Peter Anvin9ea77bd2010-08-25 16:38:20 -07001467config X86_RESERVE_LOW
H. Peter Anvind0cd7422010-08-24 17:32:04 -07001468 int "Amount of low memory, in kilobytes, to reserve for the BIOS"
1469 default 64
1470 range 4 640
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001471 ---help---
H. Peter Anvind0cd7422010-08-24 17:32:04 -07001472 Specify the amount of low memory to reserve for the BIOS.
Ingo Molnarfc381512008-09-16 10:07:34 +02001473
H. Peter Anvind0cd7422010-08-24 17:32:04 -07001474 The first page contains BIOS data structures that the kernel
1475 must not use, so that page must always be reserved.
Ingo Molnarfc381512008-09-16 10:07:34 +02001476
H. Peter Anvind0cd7422010-08-24 17:32:04 -07001477 By default we reserve the first 64K of physical RAM, as a
1478 number of BIOSes are known to corrupt that memory range
1479 during events such as suspend/resume or monitor cable
1480 insertion, so it must not be used by the kernel.
Ingo Molnarfc381512008-09-16 10:07:34 +02001481
H. Peter Anvind0cd7422010-08-24 17:32:04 -07001482 You can set this to 4 if you are absolutely sure that you
1483 trust the BIOS to get all its memory reservations and usages
1484 right. If you know your BIOS have problems beyond the
1485 default 64K area, you can set this to 640 to avoid using the
1486 entire low memory range.
1487
1488 If you have doubts about the BIOS (e.g. suspend/resume does
1489 not work or there's kernel crashes after certain hardware
1490 hotplug events) then you might want to enable
1491 X86_CHECK_BIOS_CORRUPTION=y to allow the kernel to check
1492 typical corruption patterns.
1493
1494 Leave this to the default value of 64 if you are unsure.
Ingo Molnarfc381512008-09-16 10:07:34 +02001495
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001496config MATH_EMULATION
1497 bool
1498 prompt "Math emulation" if X86_32
1499 ---help---
1500 Linux can emulate a math coprocessor (used for floating point
1501 operations) if you don't have one. 486DX and Pentium processors have
1502 a math coprocessor built in, 486SX and 386 do not, unless you added
1503 a 487DX or 387, respectively. (The messages during boot time can
1504 give you some hints here ["man dmesg"].) Everyone needs either a
1505 coprocessor or this emulation.
1506
1507 If you don't have a math coprocessor, you need to say Y here; if you
1508 say Y here even though you have a coprocessor, the coprocessor will
1509 be used nevertheless. (This behavior can be changed with the kernel
1510 command line option "no387", which comes handy if your coprocessor
1511 is broken. Try "man bootparam" or see the documentation of your boot
1512 loader (lilo or loadlin) about how to pass options to the kernel at
1513 boot time.) This means that it is a good idea to say Y here if you
1514 intend to use this kernel on different machines.
1515
1516 More information about the internals of the Linux math coprocessor
1517 emulation can be found in <file:arch/x86/math-emu/README>.
1518
1519 If you are not sure, say Y; apart from resulting in a 66 KB bigger
1520 kernel, it won't hurt.
1521
1522config MTRR
Jan Beulich6fc108a2010-04-21 15:23:44 +01001523 def_bool y
David Rientjes6a108a12011-01-20 14:44:16 -08001524 prompt "MTRR (Memory Type Range Register) support" if EXPERT
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001525 ---help---
1526 On Intel P6 family processors (Pentium Pro, Pentium II and later)
1527 the Memory Type Range Registers (MTRRs) may be used to control
1528 processor access to memory ranges. This is most useful if you have
1529 a video (VGA) card on a PCI or AGP bus. Enabling write-combining
1530 allows bus write transfers to be combined into a larger transfer
1531 before bursting over the PCI/AGP bus. This can increase performance
1532 of image write operations 2.5 times or more. Saying Y here creates a
1533 /proc/mtrr file which may be used to manipulate your processor's
1534 MTRRs. Typically the X server should use this.
1535
1536 This code has a reasonably generic interface so that similar
1537 control registers on other processors can be easily supported
1538 as well:
1539
1540 The Cyrix 6x86, 6x86MX and M II processors have Address Range
1541 Registers (ARRs) which provide a similar functionality to MTRRs. For
1542 these, the ARRs are used to emulate the MTRRs.
1543 The AMD K6-2 (stepping 8 and above) and K6-3 processors have two
1544 MTRRs. The Centaur C6 (WinChip) has 8 MCRs, allowing
1545 write-combining. All of these processors are supported by this code
1546 and it makes sense to say Y here if you have one of them.
1547
1548 Saying Y here also fixes a problem with buggy SMP BIOSes which only
1549 set the MTRRs for the boot CPU and not for the secondary CPUs. This
1550 can lead to all sorts of problems, so it's good to say Y here.
1551
1552 You can safely say Y even if your machine doesn't have MTRRs, you'll
1553 just add about 9 KB to your kernel.
1554
Randy Dunlap7225e752008-07-26 17:54:22 -07001555 See <file:Documentation/x86/mtrr.txt> for more information.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001556
Yinghai Lu95ffa242008-04-29 03:52:33 -07001557config MTRR_SANITIZER
Yinghai Lu2ffb3502008-09-30 16:29:40 -07001558 def_bool y
Yinghai Lu95ffa242008-04-29 03:52:33 -07001559 prompt "MTRR cleanup support"
1560 depends on MTRR
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001561 ---help---
Thomas Gleixneraba37282008-07-15 14:48:48 +02001562 Convert MTRR layout from continuous to discrete, so X drivers can
1563 add writeback entries.
Yinghai Lu95ffa242008-04-29 03:52:33 -07001564
Thomas Gleixneraba37282008-07-15 14:48:48 +02001565 Can be disabled with disable_mtrr_cleanup on the kernel command line.
Matt LaPlante692105b2009-01-26 11:12:25 +01001566 The largest mtrr entry size for a continuous block can be set with
Thomas Gleixneraba37282008-07-15 14:48:48 +02001567 mtrr_chunk_size.
Yinghai Lu95ffa242008-04-29 03:52:33 -07001568
Yinghai Lu2ffb3502008-09-30 16:29:40 -07001569 If unsure, say Y.
Yinghai Lu95ffa242008-04-29 03:52:33 -07001570
1571config MTRR_SANITIZER_ENABLE_DEFAULT
Yinghai Luf5098d62008-04-29 20:25:58 -07001572 int "MTRR cleanup enable value (0-1)"
1573 range 0 1
1574 default "0"
Yinghai Lu95ffa242008-04-29 03:52:33 -07001575 depends on MTRR_SANITIZER
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001576 ---help---
Yinghai Luf5098d62008-04-29 20:25:58 -07001577 Enable mtrr cleanup default value
Yinghai Lu95ffa242008-04-29 03:52:33 -07001578
Yinghai Lu12031a62008-05-02 02:40:22 -07001579config MTRR_SANITIZER_SPARE_REG_NR_DEFAULT
1580 int "MTRR cleanup spare reg num (0-7)"
1581 range 0 7
1582 default "1"
1583 depends on MTRR_SANITIZER
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001584 ---help---
Yinghai Lu12031a62008-05-02 02:40:22 -07001585 mtrr cleanup spare entries default, it can be changed via
Thomas Gleixneraba37282008-07-15 14:48:48 +02001586 mtrr_spare_reg_nr=N on the kernel command line.
Yinghai Lu12031a62008-05-02 02:40:22 -07001587
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001588config X86_PAT
Jan Beulich6fc108a2010-04-21 15:23:44 +01001589 def_bool y
David Rientjes6a108a12011-01-20 14:44:16 -08001590 prompt "x86 PAT support" if EXPERT
Ingo Molnar2a8a2712008-04-26 10:26:52 +02001591 depends on MTRR
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001592 ---help---
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001593 Use PAT attributes to setup page level cache control.
Venki Pallipadi042b78e2008-03-24 14:22:35 -07001594
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001595 PATs are the modern equivalents of MTRRs and are much more
1596 flexible than MTRRs.
1597
1598 Say N here if you see bootup problems (boot crash, boot hang,
Venki Pallipadi042b78e2008-03-24 14:22:35 -07001599 spontaneous reboots) or a non-working video driver.
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001600
1601 If unsure, say Y.
1602
Venkatesh Pallipadi46cf98c2009-07-10 09:57:37 -07001603config ARCH_USES_PG_UNCACHED
1604 def_bool y
1605 depends on X86_PAT
1606
H. Peter Anvin628c6242011-07-31 13:59:29 -07001607config ARCH_RANDOM
1608 def_bool y
1609 prompt "x86 architectural random number generator" if EXPERT
1610 ---help---
1611 Enable the x86 architectural RDRAND instruction
1612 (Intel Bull Mountain technology) to generate random numbers.
1613 If supported, this is a high bandwidth, cryptographically
1614 secure hardware random number generator.
1615
H. Peter Anvin51ae4a22012-09-21 12:43:10 -07001616config X86_SMAP
1617 def_bool y
1618 prompt "Supervisor Mode Access Prevention" if EXPERT
1619 ---help---
1620 Supervisor Mode Access Prevention (SMAP) is a security
1621 feature in newer Intel processors. There is a small
1622 performance cost if this enabled and turned on; there is
1623 also a small increase in the kernel size if this is enabled.
1624
1625 If unsure, say Y.
1626
Dave Hansen72e9b5f2014-12-12 10:38:36 -08001627config X86_INTEL_MPX
1628 prompt "Intel MPX (Memory Protection Extensions)"
1629 def_bool n
1630 depends on CPU_SUP_INTEL
1631 ---help---
1632 MPX provides hardware features that can be used in
1633 conjunction with compiler-instrumented code to check
1634 memory references. It is designed to detect buffer
1635 overflow or underflow bugs.
1636
1637 This option enables running applications which are
1638 instrumented or otherwise use MPX. It does not use MPX
1639 itself inside the kernel or to protect the kernel
1640 against bad memory references.
1641
1642 Enabling this option will make the kernel larger:
1643 ~8k of kernel text and 36 bytes of data on a 64-bit
1644 defconfig. It adds a long to the 'mm_struct' which
1645 will increase the kernel memory overhead of each
1646 process and adds some branches to paths used during
1647 exec() and munmap().
1648
1649 For details, see Documentation/x86/intel_mpx.txt
1650
1651 If unsure, say N.
1652
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001653config EFI
Jan Beulich9ba16082008-10-15 22:01:38 -07001654 bool "EFI runtime service support"
Huang, Ying5b836832008-01-30 13:31:19 +01001655 depends on ACPI
Sergey Vlasovf6ce5002013-04-16 18:31:08 +04001656 select UCS2_STRING
Ard Biesheuvel022ee6c2014-06-26 12:09:05 +02001657 select EFI_RUNTIME_WRAPPERS
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001658 ---help---
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001659 This enables the kernel to use EFI runtime services that are
1660 available (such as the EFI variable services).
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001661
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001662 This option is only useful on systems that have EFI firmware.
1663 In addition, you should use the latest ELILO loader available
1664 at <http://elilo.sourceforge.net> in order to take advantage
1665 of EFI runtime services. However, even with this option, the
1666 resultant kernel should continue to boot on existing non-EFI
1667 platforms.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001668
Matt Fleming291f3632011-12-12 21:27:52 +00001669config EFI_STUB
1670 bool "EFI stub support"
Matt Flemingb16d8c22014-08-05 00:12:19 +01001671 depends on EFI && !X86_USE_3DNOW
Matt Fleming7b2a5832014-07-11 08:45:25 +01001672 select RELOCATABLE
Matt Fleming291f3632011-12-12 21:27:52 +00001673 ---help---
1674 This kernel feature allows a bzImage to be loaded directly
1675 by EFI firmware without the use of a bootloader.
1676
Roy Franz4172fe22013-09-22 15:45:25 -07001677 See Documentation/efi-stub.txt for more information.
Matt Fleming0c759662012-03-16 12:03:13 +00001678
Matt Fleming7d453ee2014-01-10 18:52:06 +00001679config EFI_MIXED
1680 bool "EFI mixed-mode support"
1681 depends on EFI_STUB && X86_64
1682 ---help---
1683 Enabling this feature allows a 64-bit kernel to be booted
1684 on a 32-bit firmware, provided that your CPU supports 64-bit
1685 mode.
1686
1687 Note that it is not possible to boot a mixed-mode enabled
1688 kernel via the EFI boot stub - a bootloader that supports
1689 the EFI handover protocol must be used.
1690
1691 If unsure, say N.
1692
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001693config SECCOMP
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001694 def_bool y
1695 prompt "Enable seccomp to safely compute untrusted bytecode"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001696 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001697 This kernel feature is useful for number crunching applications
1698 that may need to compute untrusted bytecode during their
1699 execution. By using pipes or other transports made available to
1700 the process as file descriptors supporting the read/write
1701 syscalls, it's possible to isolate those applications in
1702 their own address space using seccomp. Once seccomp is
Alexey Dobriyan9c0bbee2008-09-09 11:01:31 +04001703 enabled via prctl(PR_SET_SECCOMP), it cannot be disabled
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001704 and the task is only allowed to execute a few safe syscalls
1705 defined by each seccomp mode.
1706
1707 If unsure, say Y. Only embedded should say N here.
1708
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001709source kernel/Kconfig.hz
1710
1711config KEXEC
1712 bool "kexec system call"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001713 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001714 kexec is a system call that implements the ability to shutdown your
1715 current kernel, and to start another kernel. It is like a reboot
1716 but it is independent of the system firmware. And like a reboot
1717 you can start any kernel with it, not just Linux.
1718
1719 The name comes from the similarity to the exec system call.
1720
1721 It is an ongoing process to be certain the hardware in a machine
1722 is properly shutdown, so do not be surprised if this code does not
Geert Uytterhoevenbf220692013-08-20 21:38:03 +02001723 initially work for you. As of this writing the exact hardware
1724 interface is strongly in flux, so no good recommendation can be
1725 made.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001726
Vivek Goyal74ca3172014-08-29 15:18:46 -07001727config KEXEC_FILE
1728 bool "kexec file based system call"
1729 select BUILD_BIN2C
1730 depends on KEXEC
1731 depends on X86_64
1732 depends on CRYPTO=y
1733 depends on CRYPTO_SHA256=y
1734 ---help---
1735 This is new version of kexec system call. This system call is
1736 file based and takes file descriptors as system call argument
1737 for kernel and initramfs as opposed to list of segments as
1738 accepted by previous system call.
1739
Vivek Goyal8e7d8382014-08-08 14:26:13 -07001740config KEXEC_VERIFY_SIG
1741 bool "Verify kernel signature during kexec_file_load() syscall"
Vivek Goyal74ca3172014-08-29 15:18:46 -07001742 depends on KEXEC_FILE
Vivek Goyal8e7d8382014-08-08 14:26:13 -07001743 ---help---
1744 This option makes kernel signature verification mandatory for
Borislav Petkovd8eb8942015-03-13 14:04:37 +01001745 the kexec_file_load() syscall.
Vivek Goyal8e7d8382014-08-08 14:26:13 -07001746
Borislav Petkovd8eb8942015-03-13 14:04:37 +01001747 In addition to that option, you need to enable signature
1748 verification for the corresponding kernel image type being
1749 loaded in order for this to work.
Vivek Goyal8e7d8382014-08-08 14:26:13 -07001750
1751config KEXEC_BZIMAGE_VERIFY_SIG
1752 bool "Enable bzImage signature verification support"
1753 depends on KEXEC_VERIFY_SIG
1754 depends on SIGNED_PE_FILE_VERIFICATION
1755 select SYSTEM_TRUSTED_KEYRING
1756 ---help---
1757 Enable bzImage signature verification support.
1758
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001759config CRASH_DUMP
Pavel Machek04b69442008-08-14 17:16:50 +02001760 bool "kernel crash dumps"
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001761 depends on X86_64 || (X86_32 && HIGHMEM)
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001762 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001763 Generate crash dump after being started by kexec.
1764 This should be normally only set in special crash dump kernels
1765 which are loaded in the main kernel with kexec-tools into
1766 a specially reserved region and then later executed after
1767 a crash by kdump/kexec. The crash dump kernel must be compiled
1768 to a memory address not used by the main kernel or BIOS using
1769 PHYSICAL_START, or it must be built as a relocatable image
1770 (CONFIG_RELOCATABLE=y).
1771 For more details see Documentation/kdump/kdump.txt
1772
Huang Ying3ab83522008-07-25 19:45:07 -07001773config KEXEC_JUMP
Kees Cook6ea30382012-10-02 11:16:47 -07001774 bool "kexec jump"
Huang Yingfee7b0d2009-03-10 10:57:16 +08001775 depends on KEXEC && HIBERNATION
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001776 ---help---
Huang Ying89081d12008-07-25 19:45:10 -07001777 Jump between original kernel and kexeced kernel and invoke
1778 code in physical address mode via KEXEC
Huang Ying3ab83522008-07-25 19:45:07 -07001779
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001780config PHYSICAL_START
David Rientjes6a108a12011-01-20 14:44:16 -08001781 hex "Physical address where the kernel is loaded" if (EXPERT || CRASH_DUMP)
H. Peter Anvinceefccc2009-05-11 16:12:16 -07001782 default "0x1000000"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001783 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001784 This gives the physical address where the kernel is loaded.
1785
1786 If kernel is a not relocatable (CONFIG_RELOCATABLE=n) then
1787 bzImage will decompress itself to above physical address and
1788 run from there. Otherwise, bzImage will run from the address where
1789 it has been loaded by the boot loader and will ignore above physical
1790 address.
1791
1792 In normal kdump cases one does not have to set/change this option
1793 as now bzImage can be compiled as a completely relocatable image
1794 (CONFIG_RELOCATABLE=y) and be used to load and run from a different
1795 address. This option is mainly useful for the folks who don't want
1796 to use a bzImage for capturing the crash dump and want to use a
1797 vmlinux instead. vmlinux is not relocatable hence a kernel needs
1798 to be specifically compiled to run from a specific memory area
1799 (normally a reserved region) and this option comes handy.
1800
H. Peter Anvinceefccc2009-05-11 16:12:16 -07001801 So if you are using bzImage for capturing the crash dump,
1802 leave the value here unchanged to 0x1000000 and set
1803 CONFIG_RELOCATABLE=y. Otherwise if you plan to use vmlinux
1804 for capturing the crash dump change this value to start of
1805 the reserved region. In other words, it can be set based on
1806 the "X" value as specified in the "crashkernel=YM@XM"
1807 command line boot parameter passed to the panic-ed
1808 kernel. Please take a look at Documentation/kdump/kdump.txt
1809 for more details about crash dumps.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001810
1811 Usage of bzImage for capturing the crash dump is recommended as
1812 one does not have to build two kernels. Same kernel can be used
1813 as production kernel and capture kernel. Above option should have
1814 gone away after relocatable bzImage support is introduced. But it
1815 is present because there are users out there who continue to use
1816 vmlinux for dump capture. This option should go away down the
1817 line.
1818
1819 Don't change this unless you know what you are doing.
1820
1821config RELOCATABLE
H. Peter Anvin26717802009-05-07 14:19:34 -07001822 bool "Build a relocatable kernel"
1823 default y
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001824 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001825 This builds a kernel image that retains relocation information
1826 so it can be loaded someplace besides the default 1MB.
1827 The relocations tend to make the kernel binary about 10% larger,
1828 but are discarded at runtime.
1829
1830 One use is for the kexec on panic case where the recovery kernel
1831 must live at a different physical address than the primary
1832 kernel.
1833
1834 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
1835 it has been loaded at and the compile time physical address
Kees Cook8ab38202013-10-10 17:18:14 -07001836 (CONFIG_PHYSICAL_START) is used as the minimum location.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001837
Kees Cook8ab38202013-10-10 17:18:14 -07001838config RANDOMIZE_BASE
1839 bool "Randomize the address of the kernel image"
1840 depends on RELOCATABLE
Kees Cook8ab38202013-10-10 17:18:14 -07001841 default n
1842 ---help---
1843 Randomizes the physical and virtual address at which the
1844 kernel image is decompressed, as a security feature that
1845 deters exploit attempts relying on knowledge of the location
1846 of kernel internals.
1847
Kees Cooka653f352013-11-11 14:28:39 -08001848 Entropy is generated using the RDRAND instruction if it is
1849 supported. If RDTSC is supported, it is used as well. If
1850 neither RDRAND nor RDTSC are supported, then randomness is
1851 read from the i8254 timer.
Kees Cook8ab38202013-10-10 17:18:14 -07001852
1853 The kernel will be offset by up to RANDOMIZE_BASE_MAX_OFFSET,
Kees Cooka653f352013-11-11 14:28:39 -08001854 and aligned according to PHYSICAL_ALIGN. Since the kernel is
1855 built using 2GiB addressing, and PHYSICAL_ALGIN must be at a
1856 minimum of 2MiB, only 10 bits of entropy is theoretically
1857 possible. At best, due to page table layouts, 64-bit can use
1858 9 bits of entropy and 32-bit uses 8 bits.
Kees Cook8ab38202013-10-10 17:18:14 -07001859
Kees Cookda2b6fb2013-12-10 12:27:45 -08001860 If unsure, say N.
1861
Kees Cook8ab38202013-10-10 17:18:14 -07001862config RANDOMIZE_BASE_MAX_OFFSET
Kees Cookda2b6fb2013-12-10 12:27:45 -08001863 hex "Maximum kASLR offset allowed" if EXPERT
Kees Cook8ab38202013-10-10 17:18:14 -07001864 depends on RANDOMIZE_BASE
Kees Cook6145cfe2013-10-10 17:18:18 -07001865 range 0x0 0x20000000 if X86_32
1866 default "0x20000000" if X86_32
1867 range 0x0 0x40000000 if X86_64
1868 default "0x40000000" if X86_64
Kees Cook8ab38202013-10-10 17:18:14 -07001869 ---help---
Kees Cookda2b6fb2013-12-10 12:27:45 -08001870 The lesser of RANDOMIZE_BASE_MAX_OFFSET and available physical
1871 memory is used to determine the maximal offset in bytes that will
1872 be applied to the kernel when kernel Address Space Layout
1873 Randomization (kASLR) is active. This must be a multiple of
1874 PHYSICAL_ALIGN.
Kees Cook6145cfe2013-10-10 17:18:18 -07001875
Kees Cookda2b6fb2013-12-10 12:27:45 -08001876 On 32-bit this is limited to 512MiB by page table layouts. The
1877 default is 512MiB.
Kees Cook6145cfe2013-10-10 17:18:18 -07001878
Kees Cookda2b6fb2013-12-10 12:27:45 -08001879 On 64-bit this is limited by how the kernel fixmap page table is
1880 positioned, so this cannot be larger than 1GiB currently. Without
1881 RANDOMIZE_BASE, there is a 512MiB to 1.5GiB split between kernel
1882 and modules. When RANDOMIZE_BASE_MAX_OFFSET is above 512MiB, the
1883 modules area will shrink to compensate, up to the current maximum
1884 1GiB to 1GiB split. The default is 1GiB.
1885
1886 If unsure, leave at the default value.
Kees Cook8ab38202013-10-10 17:18:14 -07001887
1888# Relocation on x86 needs some additional build support
H. Peter Anvin845adf72009-05-05 21:20:51 -07001889config X86_NEED_RELOCS
1890 def_bool y
Kees Cook8ab38202013-10-10 17:18:14 -07001891 depends on RANDOMIZE_BASE || (X86_32 && RELOCATABLE)
H. Peter Anvin845adf72009-05-05 21:20:51 -07001892
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001893config PHYSICAL_ALIGN
Kees Cooka0215062013-07-08 09:15:17 -07001894 hex "Alignment value to which kernel should be aligned"
Kees Cook8ab38202013-10-10 17:18:14 -07001895 default "0x200000"
Kees Cooka0215062013-07-08 09:15:17 -07001896 range 0x2000 0x1000000 if X86_32
1897 range 0x200000 0x1000000 if X86_64
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001898 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001899 This value puts the alignment restrictions on physical address
1900 where kernel is loaded and run from. Kernel is compiled for an
1901 address which meets above alignment restriction.
1902
1903 If bootloader loads the kernel at a non-aligned address and
1904 CONFIG_RELOCATABLE is set, kernel will move itself to nearest
1905 address aligned to above value and run from there.
1906
1907 If bootloader loads the kernel at a non-aligned address and
1908 CONFIG_RELOCATABLE is not set, kernel will ignore the run time
1909 load address and decompress itself to the address it has been
1910 compiled for and run from there. The address for which kernel is
1911 compiled already meets above alignment restrictions. Hence the
1912 end result is that kernel runs from a physical address meeting
1913 above alignment restrictions.
1914
Kees Cooka0215062013-07-08 09:15:17 -07001915 On 32-bit this value must be a multiple of 0x2000. On 64-bit
1916 this value must be a multiple of 0x200000.
1917
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001918 Don't change this unless you know what you are doing.
1919
1920config HOTPLUG_CPU
Dimitri Sivanich7c13e6a2008-08-11 10:46:46 -05001921 bool "Support for hot-pluggable CPUs"
Stephen Rothwell40b31362013-05-21 13:49:35 +10001922 depends on SMP
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001923 ---help---
Dimitri Sivanich7c13e6a2008-08-11 10:46:46 -05001924 Say Y here to allow turning CPUs off and on. CPUs can be
1925 controlled through /sys/devices/system/cpu.
1926 ( Note: power management support will enable this option
1927 automatically on SMP systems. )
1928 Say N if you want to disable CPU hotplug.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001929
Fenghua Yu80aa1df2012-11-13 11:32:39 -08001930config BOOTPARAM_HOTPLUG_CPU0
1931 bool "Set default setting of cpu0_hotpluggable"
1932 default n
Kees Cook2c922cd2013-01-22 13:01:19 -08001933 depends on HOTPLUG_CPU
Fenghua Yu80aa1df2012-11-13 11:32:39 -08001934 ---help---
1935 Set whether default state of cpu0_hotpluggable is on or off.
1936
1937 Say Y here to enable CPU0 hotplug by default. If this switch
1938 is turned on, there is no need to give cpu0_hotplug kernel
1939 parameter and the CPU0 hotplug feature is enabled by default.
1940
1941 Please note: there are two known CPU0 dependencies if you want
1942 to enable the CPU0 hotplug feature either by this switch or by
1943 cpu0_hotplug kernel parameter.
1944
1945 First, resume from hibernate or suspend always starts from CPU0.
1946 So hibernate and suspend are prevented if CPU0 is offline.
1947
1948 Second dependency is PIC interrupts always go to CPU0. CPU0 can not
1949 offline if any interrupt can not migrate out of CPU0. There may
1950 be other CPU0 dependencies.
1951
1952 Please make sure the dependencies are under your control before
1953 you enable this feature.
1954
1955 Say N if you don't want to enable CPU0 hotplug feature by default.
1956 You still can enable the CPU0 hotplug feature at boot by kernel
1957 parameter cpu0_hotplug.
1958
Fenghua Yua71c8bc2012-11-13 11:32:51 -08001959config DEBUG_HOTPLUG_CPU0
1960 def_bool n
1961 prompt "Debug CPU0 hotplug"
Kees Cook2c922cd2013-01-22 13:01:19 -08001962 depends on HOTPLUG_CPU
Fenghua Yua71c8bc2012-11-13 11:32:51 -08001963 ---help---
1964 Enabling this option offlines CPU0 (if CPU0 can be offlined) as
1965 soon as possible and boots up userspace with CPU0 offlined. User
1966 can online CPU0 back after boot time.
1967
1968 To debug CPU0 hotplug, you need to enable CPU0 offline/online
1969 feature by either turning on CONFIG_BOOTPARAM_HOTPLUG_CPU0 during
1970 compilation or giving cpu0_hotplug kernel parameter at boot.
1971
1972 If unsure, say N.
1973
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001974config COMPAT_VDSO
Andy Lutomirskib0b49f22014-03-13 16:01:26 -07001975 def_bool n
1976 prompt "Disable the 32-bit vDSO (needed for glibc 2.3.3)"
Roland McGrathaf65d642008-01-30 13:30:43 +01001977 depends on X86_32 || IA32_EMULATION
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001978 ---help---
Andy Lutomirskib0b49f22014-03-13 16:01:26 -07001979 Certain buggy versions of glibc will crash if they are
1980 presented with a 32-bit vDSO that is not mapped at the address
1981 indicated in its segment table.
Randy Dunlape84446d2009-11-10 15:46:52 -08001982
Andy Lutomirskib0b49f22014-03-13 16:01:26 -07001983 The bug was introduced by f866314b89d56845f55e6f365e18b31ec978ec3a
1984 and fixed by 3b3ddb4f7db98ec9e912ccdf54d35df4aa30e04a and
1985 49ad572a70b8aeb91e57483a11dd1b77e31c4468. Glibc 2.3.3 is
1986 the only released version with the bug, but OpenSUSE 9
1987 contains a buggy "glibc 2.3.2".
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001988
Andy Lutomirskib0b49f22014-03-13 16:01:26 -07001989 The symptom of the bug is that everything crashes on startup, saying:
1990 dl_main: Assertion `(void *) ph->p_vaddr == _rtld_local._dl_sysinfo_dso' failed!
1991
1992 Saying Y here changes the default value of the vdso32 boot
1993 option from 1 to 0, which turns off the 32-bit vDSO entirely.
1994 This works around the glibc bug but hurts performance.
1995
1996 If unsure, say N: if you are compiling your own kernel, you
1997 are unlikely to be using a buggy version of glibc.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001998
Tim Bird516cbf32008-08-12 12:52:36 -07001999config CMDLINE_BOOL
2000 bool "Built-in kernel command line"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002001 ---help---
Tim Bird516cbf32008-08-12 12:52:36 -07002002 Allow for specifying boot arguments to the kernel at
2003 build time. On some systems (e.g. embedded ones), it is
2004 necessary or convenient to provide some or all of the
2005 kernel boot arguments with the kernel itself (that is,
2006 to not rely on the boot loader to provide them.)
2007
2008 To compile command line arguments into the kernel,
2009 set this option to 'Y', then fill in the
2010 the boot arguments in CONFIG_CMDLINE.
2011
2012 Systems with fully functional boot loaders (i.e. non-embedded)
2013 should leave this option set to 'N'.
2014
2015config CMDLINE
2016 string "Built-in kernel command string"
2017 depends on CMDLINE_BOOL
2018 default ""
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002019 ---help---
Tim Bird516cbf32008-08-12 12:52:36 -07002020 Enter arguments here that should be compiled into the kernel
2021 image and used at boot time. If the boot loader provides a
2022 command line at boot time, it is appended to this string to
2023 form the full kernel command line, when the system boots.
2024
2025 However, you can use the CONFIG_CMDLINE_OVERRIDE option to
2026 change this behavior.
2027
2028 In most cases, the command line (whether built-in or provided
2029 by the boot loader) should specify the device for the root
2030 file system.
2031
2032config CMDLINE_OVERRIDE
2033 bool "Built-in command line overrides boot loader arguments"
Tim Bird516cbf32008-08-12 12:52:36 -07002034 depends on CMDLINE_BOOL
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002035 ---help---
Tim Bird516cbf32008-08-12 12:52:36 -07002036 Set this option to 'Y' to have the kernel ignore the boot loader
2037 command line, and use ONLY the built-in command line.
2038
2039 This is used to work around broken boot loaders. This should
2040 be set to 'N' under normal conditions.
2041
Seth Jenningsb700e7f2014-12-16 11:58:19 -06002042source "kernel/livepatch/Kconfig"
2043
Sam Ravnborg506f1d02007-11-09 21:56:54 +01002044endmenu
2045
2046config ARCH_ENABLE_MEMORY_HOTPLUG
2047 def_bool y
2048 depends on X86_64 || (X86_32 && HIGHMEM)
2049
Gary Hade35551052008-10-31 10:52:03 -07002050config ARCH_ENABLE_MEMORY_HOTREMOVE
2051 def_bool y
2052 depends on MEMORY_HOTPLUG
2053
Lee Schermerhorne534c7c2010-05-26 14:44:58 -07002054config USE_PERCPU_NUMA_NODE_ID
Tejun Heo645a7912011-01-23 14:37:40 +01002055 def_bool y
Lee Schermerhorne534c7c2010-05-26 14:44:58 -07002056 depends on NUMA
2057
Kirill A. Shutemov94918462013-11-14 14:31:10 -08002058config ARCH_ENABLE_SPLIT_PMD_PTLOCK
2059 def_bool y
2060 depends on X86_64 || X86_PAE
2061
Naoya Horiguchic177c812014-06-04 16:05:35 -07002062config ARCH_ENABLE_HUGEPAGE_MIGRATION
2063 def_bool y
2064 depends on X86_64 && HUGETLB_PAGE && MIGRATION
2065
Bjorn Helgaasda85f862008-11-05 13:37:27 -06002066menu "Power management and ACPI options"
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002067
2068config ARCH_HIBERNATION_HEADER
Harvey Harrison3c2362e2008-01-30 13:31:03 +01002069 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002070 depends on X86_64 && HIBERNATION
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002071
2072source "kernel/power/Kconfig"
2073
2074source "drivers/acpi/Kconfig"
2075
Feng Tangefafc8b2009-08-14 15:23:29 -04002076source "drivers/sfi/Kconfig"
2077
Andi Kleena6b68072008-01-30 13:32:49 +01002078config X86_APM_BOOT
Jan Beulich6fc108a2010-04-21 15:23:44 +01002079 def_bool y
Paul Bolle282e5aa2011-11-17 11:41:31 +01002080 depends on APM
Andi Kleena6b68072008-01-30 13:32:49 +01002081
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002082menuconfig APM
2083 tristate "APM (Advanced Power Management) BIOS support"
Ingo Molnarefefa6f2008-07-10 16:09:50 +02002084 depends on X86_32 && PM_SLEEP
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002085 ---help---
2086 APM is a BIOS specification for saving power using several different
2087 techniques. This is mostly useful for battery powered laptops with
2088 APM compliant BIOSes. If you say Y here, the system time will be
2089 reset after a RESUME operation, the /proc/apm device will provide
2090 battery status information, and user-space programs will receive
2091 notification of APM "events" (e.g. battery status change).
2092
2093 If you select "Y" here, you can disable actual use of the APM
2094 BIOS by passing the "apm=off" option to the kernel at boot time.
2095
2096 Note that the APM support is almost completely disabled for
2097 machines with more than one CPU.
2098
2099 In order to use APM, you will need supporting software. For location
Michael Witten2dc98fd2011-07-08 21:11:16 +00002100 and more information, read <file:Documentation/power/apm-acpi.txt>
2101 and the Battery Powered Linux mini-HOWTO, available from
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002102 <http://www.tldp.org/docs.html#howto>.
2103
2104 This driver does not spin down disk drives (see the hdparm(8)
2105 manpage ("man 8 hdparm") for that), and it doesn't turn off
2106 VESA-compliant "green" monitors.
2107
2108 This driver does not support the TI 4000M TravelMate and the ACER
2109 486/DX4/75 because they don't have compliant BIOSes. Many "green"
2110 desktop machines also don't have compliant BIOSes, and this driver
2111 may cause those machines to panic during the boot phase.
2112
2113 Generally, if you don't have a battery in your machine, there isn't
2114 much point in using this driver and you should say N. If you get
2115 random kernel OOPSes or reboots that don't seem to be related to
2116 anything, try disabling/enabling this option (or disabling/enabling
2117 APM in your BIOS).
2118
2119 Some other things you should try when experiencing seemingly random,
2120 "weird" problems:
2121
2122 1) make sure that you have enough swap space and that it is
2123 enabled.
2124 2) pass the "no-hlt" option to the kernel
2125 3) switch on floating point emulation in the kernel and pass
2126 the "no387" option to the kernel
2127 4) pass the "floppy=nodma" option to the kernel
2128 5) pass the "mem=4M" option to the kernel (thereby disabling
2129 all but the first 4 MB of RAM)
2130 6) make sure that the CPU is not over clocked.
2131 7) read the sig11 FAQ at <http://www.bitwizard.nl/sig11/>
2132 8) disable the cache from your BIOS settings
2133 9) install a fan for the video card or exchange video RAM
2134 10) install a better fan for the CPU
2135 11) exchange RAM chips
2136 12) exchange the motherboard.
2137
2138 To compile this driver as a module, choose M here: the
2139 module will be called apm.
2140
2141if APM
2142
2143config APM_IGNORE_USER_SUSPEND
2144 bool "Ignore USER SUSPEND"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002145 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002146 This option will ignore USER SUSPEND requests. On machines with a
2147 compliant APM BIOS, you want to say N. However, on the NEC Versa M
2148 series notebooks, it is necessary to say Y because of a BIOS bug.
2149
2150config APM_DO_ENABLE
2151 bool "Enable PM at boot time"
2152 ---help---
2153 Enable APM features at boot time. From page 36 of the APM BIOS
2154 specification: "When disabled, the APM BIOS does not automatically
2155 power manage devices, enter the Standby State, enter the Suspend
2156 State, or take power saving steps in response to CPU Idle calls."
2157 This driver will make CPU Idle calls when Linux is idle (unless this
2158 feature is turned off -- see "Do CPU IDLE calls", below). This
2159 should always save battery power, but more complicated APM features
2160 will be dependent on your BIOS implementation. You may need to turn
2161 this option off if your computer hangs at boot time when using APM
2162 support, or if it beeps continuously instead of suspending. Turn
2163 this off if you have a NEC UltraLite Versa 33/C or a Toshiba
2164 T400CDT. This is off by default since most machines do fine without
2165 this feature.
2166
2167config APM_CPU_IDLE
Len Browndd8af072013-02-09 21:10:04 -05002168 depends on CPU_IDLE
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002169 bool "Make CPU Idle calls when idle"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002170 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002171 Enable calls to APM CPU Idle/CPU Busy inside the kernel's idle loop.
2172 On some machines, this can activate improved power savings, such as
2173 a slowed CPU clock rate, when the machine is idle. These idle calls
2174 are made after the idle loop has run for some length of time (e.g.,
2175 333 mS). On some machines, this will cause a hang at boot time or
2176 whenever the CPU becomes idle. (On machines with more than one CPU,
2177 this option does nothing.)
2178
2179config APM_DISPLAY_BLANK
2180 bool "Enable console blanking using APM"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002181 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002182 Enable console blanking using the APM. Some laptops can use this to
2183 turn off the LCD backlight when the screen blanker of the Linux
2184 virtual console blanks the screen. Note that this is only used by
2185 the virtual console screen blanker, and won't turn off the backlight
2186 when using the X Window system. This also doesn't have anything to
2187 do with your VESA-compliant power-saving monitor. Further, this
2188 option doesn't work for all laptops -- it might not turn off your
2189 backlight at all, or it might print a lot of errors to the console,
2190 especially if you are using gpm.
2191
2192config APM_ALLOW_INTS
2193 bool "Allow interrupts during APM BIOS calls"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002194 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002195 Normally we disable external interrupts while we are making calls to
2196 the APM BIOS as a measure to lessen the effects of a badly behaving
2197 BIOS implementation. The BIOS should reenable interrupts if it
2198 needs to. Unfortunately, some BIOSes do not -- especially those in
2199 many of the newer IBM Thinkpads. If you experience hangs when you
2200 suspend, try setting this to Y. Otherwise, say N.
2201
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002202endif # APM
2203
Dave Jonesbb0a56e2011-05-19 18:51:07 -04002204source "drivers/cpufreq/Kconfig"
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002205
2206source "drivers/cpuidle/Kconfig"
2207
Andy Henroid27471fd2008-10-09 11:45:22 -07002208source "drivers/idle/Kconfig"
2209
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002210endmenu
2211
2212
2213menu "Bus options (PCI etc.)"
2214
2215config PCI
Ingo Molnar1ac97012008-05-19 14:10:14 +02002216 bool "PCI support"
Adrian Bunk1c858082008-01-30 13:32:32 +01002217 default y
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002218 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002219 Find out whether you have a PCI motherboard. PCI is the name of a
2220 bus system, i.e. the way the CPU talks to the other stuff inside
2221 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
2222 VESA. If you have PCI, say Y, otherwise N.
2223
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002224choice
2225 prompt "PCI access mode"
Ingo Molnarefefa6f2008-07-10 16:09:50 +02002226 depends on X86_32 && PCI
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002227 default PCI_GOANY
2228 ---help---
2229 On PCI systems, the BIOS can be used to detect the PCI devices and
2230 determine their configuration. However, some old PCI motherboards
2231 have BIOS bugs and may crash if this is done. Also, some embedded
2232 PCI-based systems don't have any BIOS at all. Linux can also try to
2233 detect the PCI hardware directly without using the BIOS.
2234
2235 With this option, you can specify how Linux should detect the
2236 PCI devices. If you choose "BIOS", the BIOS will be used,
2237 if you choose "Direct", the BIOS won't be used, and if you
2238 choose "MMConfig", then PCI Express MMCONFIG will be used.
2239 If you choose "Any", the kernel will try MMCONFIG, then the
2240 direct access method and falls back to the BIOS if that doesn't
2241 work. If unsure, go with the default, which is "Any".
2242
2243config PCI_GOBIOS
2244 bool "BIOS"
2245
2246config PCI_GOMMCONFIG
2247 bool "MMConfig"
2248
2249config PCI_GODIRECT
2250 bool "Direct"
2251
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07002252config PCI_GOOLPC
Daniel Drake76fb6572010-09-23 17:28:04 +01002253 bool "OLPC XO-1"
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07002254 depends on OLPC
2255
Andres Salomon2bdd1b02008-06-05 14:14:41 -07002256config PCI_GOANY
2257 bool "Any"
2258
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002259endchoice
2260
2261config PCI_BIOS
Harvey Harrison3c2362e2008-01-30 13:31:03 +01002262 def_bool y
Ingo Molnarefefa6f2008-07-10 16:09:50 +02002263 depends on X86_32 && PCI && (PCI_GOBIOS || PCI_GOANY)
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002264
2265# x86-64 doesn't support PCI BIOS access from long mode so always go direct.
2266config PCI_DIRECT
Harvey Harrison3c2362e2008-01-30 13:31:03 +01002267 def_bool y
Shaohua Li0aba4962011-05-27 14:59:39 +08002268 depends on PCI && (X86_64 || (PCI_GODIRECT || PCI_GOANY || PCI_GOOLPC || PCI_GOMMCONFIG))
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002269
2270config PCI_MMCONFIG
Harvey Harrison3c2362e2008-01-30 13:31:03 +01002271 def_bool y
Feng Tang5f0db7a2009-08-14 15:37:50 -04002272 depends on X86_32 && PCI && (ACPI || SFI) && (PCI_GOMMCONFIG || PCI_GOANY)
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002273
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07002274config PCI_OLPC
Andres Salomon2bdd1b02008-06-05 14:14:41 -07002275 def_bool y
2276 depends on PCI && OLPC && (PCI_GOOLPC || PCI_GOANY)
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07002277
Alex Nixonb5401a92010-03-18 16:31:34 -04002278config PCI_XEN
2279 def_bool y
2280 depends on PCI && XEN
2281 select SWIOTLB_XEN
2282
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002283config PCI_DOMAINS
Harvey Harrison3c2362e2008-01-30 13:31:03 +01002284 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002285 depends on PCI
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002286
2287config PCI_MMCONFIG
2288 bool "Support mmconfig PCI config space access"
2289 depends on X86_64 && PCI && ACPI
2290
Ira W. Snyder3f6ea842010-04-01 11:43:30 -07002291config PCI_CNB20LE_QUIRK
David Rientjes6a108a12011-01-20 14:44:16 -08002292 bool "Read CNB20LE Host Bridge Windows" if EXPERT
Kees Cook6ea30382012-10-02 11:16:47 -07002293 depends on PCI
Ira W. Snyder3f6ea842010-04-01 11:43:30 -07002294 help
2295 Read the PCI windows out of the CNB20LE host bridge. This allows
2296 PCI hotplug to work on systems with the CNB20LE chipset which do
2297 not have ACPI.
2298
Bjorn Helgaas64a5fed2011-01-06 10:12:30 -07002299 There's no public spec for this chipset, and this functionality
2300 is known to be incomplete.
2301
2302 You should say N unless you know you need this.
2303
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002304source "drivers/pci/pcie/Kconfig"
2305
2306source "drivers/pci/Kconfig"
2307
David Rientjes1c00f012011-03-22 16:34:59 -07002308# x86_64 have no ISA slots, but can have ISA-style DMA.
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002309config ISA_DMA_API
David Rientjes1c00f012011-03-22 16:34:59 -07002310 bool "ISA-style DMA support" if (X86_64 && EXPERT)
2311 default y
2312 help
2313 Enables ISA-style DMA support for devices requiring such controllers.
2314 If unsure, say Y.
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002315
2316if X86_32
2317
2318config ISA
2319 bool "ISA support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002320 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002321 Find out whether you have ISA slots on your motherboard. ISA is the
2322 name of a bus system, i.e. the way the CPU talks to the other stuff
2323 inside your box. Other bus systems are PCI, EISA, MicroChannel
2324 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
2325 newer boards don't support it. If you have ISA, say Y, otherwise N.
2326
2327config EISA
2328 bool "EISA support"
2329 depends on ISA
2330 ---help---
2331 The Extended Industry Standard Architecture (EISA) bus was
2332 developed as an open alternative to the IBM MicroChannel bus.
2333
2334 The EISA bus provided some of the features of the IBM MicroChannel
2335 bus while maintaining backward compatibility with cards made for
2336 the older ISA bus. The EISA bus saw limited use between 1988 and
2337 1995 when it was made obsolete by the PCI bus.
2338
2339 Say Y here if you are building a kernel for an EISA-based machine.
2340
2341 Otherwise, say N.
2342
2343source "drivers/eisa/Kconfig"
2344
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002345config SCx200
2346 tristate "NatSemi SCx200 support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002347 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002348 This provides basic support for National Semiconductor's
2349 (now AMD's) Geode processors. The driver probes for the
2350 PCI-IDs of several on-chip devices, so its a good dependency
2351 for other scx200_* drivers.
2352
2353 If compiled as a module, the driver is named scx200.
2354
2355config SCx200HR_TIMER
2356 tristate "NatSemi SCx200 27MHz High-Resolution Timer Support"
John Stultz592913e2010-07-13 17:56:20 -07002357 depends on SCx200
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002358 default y
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002359 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002360 This driver provides a clocksource built upon the on-chip
2361 27MHz high-resolution timer. Its also a workaround for
2362 NSC Geode SC-1100's buggy TSC, which loses time when the
2363 processor goes idle (as is done by the scheduler). The
2364 other workaround is idle=poll boot option.
2365
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07002366config OLPC
2367 bool "One Laptop Per Child support"
Thomas Gleixner54008972011-02-23 09:50:15 +01002368 depends on !X86_PAE
Andres Salomon3c554942009-12-14 18:00:36 -08002369 select GPIOLIB
Thomas Gleixnerdc3119e72011-02-23 10:08:31 +01002370 select OF
Daniel Drake45bb1672011-03-13 15:10:17 +00002371 select OF_PROMTREE
Grant Likelyb4e51852011-12-16 15:50:17 -07002372 select IRQ_DOMAIN
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002373 ---help---
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07002374 Add support for detecting the unique features of the OLPC
2375 XO hardware.
2376
Daniel Drakea3128582011-06-25 17:34:10 +01002377config OLPC_XO1_PM
2378 bool "OLPC XO-1 Power Management"
Daniel Drake97c4cb72011-06-25 17:34:11 +01002379 depends on OLPC && MFD_CS5535 && PM_SLEEP
Daniel Drakea3128582011-06-25 17:34:10 +01002380 select MFD_CORE
Daniel Drakebf1ebf02010-10-10 10:40:32 +01002381 ---help---
Daniel Drake97c4cb72011-06-25 17:34:11 +01002382 Add support for poweroff and suspend of the OLPC XO-1 laptop.
Daniel Drakebf1ebf02010-10-10 10:40:32 +01002383
Daniel Drakecfee9592011-06-25 17:34:17 +01002384config OLPC_XO1_RTC
2385 bool "OLPC XO-1 Real Time Clock"
2386 depends on OLPC_XO1_PM && RTC_DRV_CMOS
2387 ---help---
2388 Add support for the XO-1 real time clock, which can be used as a
2389 programmable wakeup source.
2390
Daniel Drake7feda8e2011-06-25 17:34:12 +01002391config OLPC_XO1_SCI
2392 bool "OLPC XO-1 SCI extras"
Daniel Draked8d01a62011-07-24 18:33:21 +01002393 depends on OLPC && OLPC_XO1_PM
Randy Dunlaped8e47f2012-12-18 12:22:17 -08002394 depends on INPUT=y
Daniel Draked8d01a62011-07-24 18:33:21 +01002395 select POWER_SUPPLY
Daniel Drake7feda8e2011-06-25 17:34:12 +01002396 select GPIO_CS5535
2397 select MFD_CORE
2398 ---help---
2399 Add support for SCI-based features of the OLPC XO-1 laptop:
Daniel Drake7bc74b32011-06-25 17:34:14 +01002400 - EC-driven system wakeups
Daniel Drake7feda8e2011-06-25 17:34:12 +01002401 - Power button
Daniel Drake7bc74b32011-06-25 17:34:14 +01002402 - Ebook switch
Daniel Drake2cf2bae2011-06-25 17:34:15 +01002403 - Lid switch
Daniel Drakee1040ac2011-06-25 17:34:16 +01002404 - AC adapter status updates
2405 - Battery status updates
Daniel Drake7feda8e2011-06-25 17:34:12 +01002406
Daniel Drakea0f30f52011-06-25 17:34:18 +01002407config OLPC_XO15_SCI
2408 bool "OLPC XO-1.5 SCI extras"
Daniel Draked8d01a62011-07-24 18:33:21 +01002409 depends on OLPC && ACPI
2410 select POWER_SUPPLY
Daniel Drakea0f30f52011-06-25 17:34:18 +01002411 ---help---
2412 Add support for SCI-based features of the OLPC XO-1.5 laptop:
2413 - EC-driven system wakeups
2414 - AC adapter status updates
2415 - Battery status updates
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002416
Ed Wildgoosed4f3e352011-09-20 14:00:12 -07002417config ALIX
2418 bool "PCEngines ALIX System Support (LED setup)"
2419 select GPIOLIB
2420 ---help---
2421 This option enables system support for the PCEngines ALIX.
2422 At present this just sets up LEDs for GPIO control on
2423 ALIX2/3/6 boards. However, other system specific setup should
2424 get added here.
2425
2426 Note: You must still enable the drivers for GPIO and LED support
2427 (GPIO_CS5535 & LEDS_GPIO) to actually use the LEDs
2428
2429 Note: You have to set alix.force=1 for boards with Award BIOS.
2430
Philip Prindevilleda4e3302012-03-05 15:05:15 -08002431config NET5501
2432 bool "Soekris Engineering net5501 System Support (LEDS, GPIO, etc)"
2433 select GPIOLIB
2434 ---help---
2435 This option enables system support for the Soekris Engineering net5501.
2436
Philip A. Prindeville31970592012-01-14 01:45:39 -07002437config GEOS
2438 bool "Traverse Technologies GEOS System Support (LEDS, GPIO, etc)"
2439 select GPIOLIB
2440 depends on DMI
2441 ---help---
2442 This option enables system support for the Traverse Technologies GEOS.
2443
Vivien Didelot7d029122013-01-04 16:18:14 -05002444config TS5500
2445 bool "Technologic Systems TS-5500 platform support"
2446 depends on MELAN
2447 select CHECK_SIGNATURE
2448 select NEW_LEDS
2449 select LEDS_CLASS
2450 ---help---
2451 This option enables system support for the Technologic Systems TS-5500.
2452
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002453endif # X86_32
2454
Andreas Herrmann23ac4ae2010-09-17 18:03:43 +02002455config AMD_NB
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002456 def_bool y
Borislav Petkov0e152cd2010-03-12 15:43:03 +01002457 depends on CPU_SUP_AMD && PCI
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002458
2459source "drivers/pcmcia/Kconfig"
2460
2461source "drivers/pci/hotplug/Kconfig"
2462
Alexandre Bounine388b78a2011-03-23 16:43:03 -07002463config RAPIDIO
Alexandre Bouninefdf90ab2013-07-03 15:08:56 -07002464 tristate "RapidIO support"
Alexandre Bounine388b78a2011-03-23 16:43:03 -07002465 depends on PCI
2466 default n
2467 help
Alexandre Bouninefdf90ab2013-07-03 15:08:56 -07002468 If enabled this option will include drivers and the core
Alexandre Bounine388b78a2011-03-23 16:43:03 -07002469 infrastructure code to support RapidIO interconnect devices.
2470
2471source "drivers/rapidio/Kconfig"
2472
David Herrmanne3263ab2013-08-02 14:05:22 +02002473config X86_SYSFB
2474 bool "Mark VGA/VBE/EFI FB as generic system framebuffer"
2475 help
2476 Firmwares often provide initial graphics framebuffers so the BIOS,
2477 bootloader or kernel can show basic video-output during boot for
2478 user-guidance and debugging. Historically, x86 used the VESA BIOS
2479 Extensions and EFI-framebuffers for this, which are mostly limited
2480 to x86.
2481 This option, if enabled, marks VGA/VBE/EFI framebuffers as generic
2482 framebuffers so the new generic system-framebuffer drivers can be
2483 used on x86. If the framebuffer is not compatible with the generic
2484 modes, it is adverticed as fallback platform framebuffer so legacy
2485 drivers like efifb, vesafb and uvesafb can pick it up.
2486 If this option is not selected, all system framebuffers are always
2487 marked as fallback platform framebuffers as usual.
2488
2489 Note: Legacy fbdev drivers, including vesafb, efifb, uvesafb, will
2490 not be able to pick up generic system framebuffers if this option
2491 is selected. You are highly encouraged to enable simplefb as
2492 replacement if you select this option. simplefb can correctly deal
2493 with generic system framebuffers. But you should still keep vesafb
2494 and others enabled as fallback if a system framebuffer is
2495 incompatible with simplefb.
2496
2497 If unsure, say Y.
2498
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002499endmenu
2500
2501
2502menu "Executable file formats / Emulations"
2503
2504source "fs/Kconfig.binfmt"
2505
2506config IA32_EMULATION
2507 bool "IA32 Emulation"
2508 depends on X86_64
Randy Dunlapd1603992013-06-18 12:33:40 -07002509 select BINFMT_ELF
Roland McGratha97f52e2008-01-30 13:31:55 +01002510 select COMPAT_BINFMT_ELF
Catalin Marinasaf1839e2012-10-08 16:28:08 -07002511 select HAVE_UID16
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002512 ---help---
H. J. Lu5fd92e62012-02-19 10:40:03 -08002513 Include code to run legacy 32-bit programs under a
2514 64-bit kernel. You should likely turn this on, unless you're
2515 100% sure that you don't have any 32-bit programs left.
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002516
2517config IA32_AOUT
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002518 tristate "IA32 a.out support"
2519 depends on IA32_EMULATION
2520 ---help---
2521 Support old a.out binaries in the 32bit emulation.
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002522
H. Peter Anvin0bf62762012-02-27 14:09:10 -08002523config X86_X32
Kees Cook6ea30382012-10-02 11:16:47 -07002524 bool "x32 ABI for 64-bit mode"
2525 depends on X86_64 && IA32_EMULATION
H. J. Lu5fd92e62012-02-19 10:40:03 -08002526 ---help---
2527 Include code to run binaries for the x32 native 32-bit ABI
2528 for 64-bit processors. An x32 process gets access to the
2529 full 64-bit register file and wide data path while leaving
2530 pointers at 32 bits for smaller memory footprint.
2531
2532 You will need a recent binutils (2.22 or later) with
2533 elf32_x86_64 support enabled to compile a kernel with this
2534 option set.
2535
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002536config COMPAT
Harvey Harrison3c2362e2008-01-30 13:31:03 +01002537 def_bool y
H. Peter Anvin0bf62762012-02-27 14:09:10 -08002538 depends on IA32_EMULATION || X86_X32
Chris Metcalf48b25c42012-03-15 13:13:38 -04002539 select ARCH_WANT_OLD_COMPAT_IPC
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002540
Jan Beulich3120e252012-09-10 12:41:45 +01002541if COMPAT
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002542config COMPAT_FOR_U64_ALIGNMENT
Jan Beulich3120e252012-09-10 12:41:45 +01002543 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002544
2545config SYSVIPC_COMPAT
Harvey Harrison3c2362e2008-01-30 13:31:03 +01002546 def_bool y
Jan Beulich3120e252012-09-10 12:41:45 +01002547 depends on SYSVIPC
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002548
David Howellsee009e4a02011-03-07 15:06:20 +00002549config KEYS_COMPAT
Jan Beulich3120e252012-09-10 12:41:45 +01002550 def_bool y
2551 depends on KEYS
2552endif
David Howellsee009e4a02011-03-07 15:06:20 +00002553
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002554endmenu
2555
2556
Keith Packarde5beae12008-11-03 18:21:45 +01002557config HAVE_ATOMIC_IOMAP
2558 def_bool y
2559 depends on X86_32
2560
Alessandro Rubini4692d772012-04-04 19:39:58 +02002561config X86_DEV_DMA_OPS
2562 bool
Alessandro Rubini83125a32012-04-04 19:40:21 +02002563 depends on X86_64 || STA2X11
Alessandro Rubini4692d772012-04-04 19:39:58 +02002564
Alessandro Rubinif7219a52012-04-04 19:40:10 +02002565config X86_DMA_REMAP
2566 bool
Alessandro Rubini83125a32012-04-04 19:40:21 +02002567 depends on STA2X11
Alessandro Rubinif7219a52012-04-04 19:40:10 +02002568
Li, Aubrey93e5ead2014-06-30 14:08:42 +08002569config PMC_ATOM
2570 def_bool y
2571 depends on PCI
2572
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002573source "net/Kconfig"
2574
2575source "drivers/Kconfig"
2576
2577source "drivers/firmware/Kconfig"
2578
2579source "fs/Kconfig"
2580
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002581source "arch/x86/Kconfig.debug"
2582
2583source "security/Kconfig"
2584
2585source "crypto/Kconfig"
2586
Avi Kivityedf88412007-12-16 11:02:48 +02002587source "arch/x86/kvm/Kconfig"
2588
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002589source "lib/Kconfig"