blob: a39b7e5e95b388e3216ad1994a70c20a3ec5ad73 [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
Sam Ravnborg1032c0b2007-11-06 21:35:08 +010020
21### Arch settings
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010022config X86
Harvey Harrison3c2362e2008-01-30 13:31:03 +010023 def_bool y
Hanjun Guo46ba51e2014-07-18 18:02:54 +080024 select ARCH_MIGHT_HAVE_ACPI_PDC if ACPI
Stephen Boyd446f24d2013-04-30 15:28:42 -070025 select ARCH_HAS_DEBUG_STRICT_USER_COPY_CHECKS
Linus Torvalds72d93102014-09-13 11:14:53 -070026 select ARCH_HAS_FAST_MULTIPLIER
Mark Salter77fbbc82013-10-07 22:18:07 -040027 select ARCH_MIGHT_HAVE_PC_PARPORT
Mark Salter5e2c18c2014-01-01 11:34:16 -080028 select ARCH_MIGHT_HAVE_PC_SERIO
David Woodhousee17c6d52008-06-17 12:19:34 +010029 select HAVE_AOUT if X86_32
Ingo Molnara5574cf2008-05-05 23:19:50 +020030 select HAVE_UNSTABLE_SCHED_CLOCK
Mel Gorman4468dd72014-06-04 16:06:29 -070031 select ARCH_SUPPORTS_NUMA_BALANCING if X86_64
Peter Zijlstrabe5e6102013-11-18 18:27:06 +010032 select ARCH_SUPPORTS_INT128 if X86_64
Sam Ravnborgec7748b2008-02-09 10:46:40 +010033 select HAVE_IDE
Mathieu Desnoyers42d4b832008-02-02 15:10:34 -050034 select HAVE_OPROFILE
Ralf Baechle8761f1a2011-06-01 19:05:09 +010035 select HAVE_PCSPKR_PLATFORM
Peter Zijlstracc2067a2010-11-16 21:49:01 +010036 select HAVE_PERF_EVENTS
Rik van Riel28b2ee22008-07-23 21:27:05 -070037 select HAVE_IOREMAP_PROT
Mathieu Desnoyers3f550092008-02-02 15:10:35 -050038 select HAVE_KPROBES
Yinghai Lu72d7c3b2010-08-25 13:39:17 -070039 select HAVE_MEMBLOCK
Tejun Heo0608f702011-07-14 11:44:23 +020040 select HAVE_MEMBLOCK_NODE_MAP
Tejun Heoc378ddd2011-07-14 11:46:03 +020041 select ARCH_DISCARD_MEMBLOCK
Ingo Molnar1f972762008-07-26 13:52:50 +020042 select ARCH_WANT_OPTIONAL_GPIOLIB
Ingo Molnarda4276b2009-01-07 11:05:10 +010043 select ARCH_WANT_FRAME_POINTERS
FUJITA Tomonori7c095e42009-06-17 16:28:12 -070044 select HAVE_DMA_ATTRS
Akinobu Mita9c5a3622014-06-04 16:06:50 -070045 select HAVE_DMA_CONTIGUOUS
Ananth N Mavinakayanahalli9edddaa2008-03-04 14:28:37 -080046 select HAVE_KRETPROBES
Mark Salter5b7c73e2014-04-07 15:39:49 -070047 select GENERIC_EARLY_IOREMAP
Masami Hiramatsuc0f7ac32010-02-25 08:34:46 -050048 select HAVE_OPTPROBES
Masami Hiramatsue7dbfe32012-09-28 17:15:20 +090049 select HAVE_KPROBES_ON_FTRACE
Steven Rostedte4b2b882008-08-14 15:45:11 -040050 select HAVE_FTRACE_MCOUNT_RECORD
Steven Rostedtd57c5d52011-02-09 13:32:18 -050051 select HAVE_FENTRY if X86_64
Steven Rostedtcf4db252010-10-14 23:32:44 -040052 select HAVE_C_RECORDMCOUNT
Steven Rostedt677aa9f2008-05-17 00:01:36 -040053 select HAVE_DYNAMIC_FTRACE
Masami Hiramatsu06aeaae2012-09-28 17:15:17 +090054 select HAVE_DYNAMIC_FTRACE_WITH_REGS
Steven Rostedt606576c2008-10-06 19:06:12 -040055 select HAVE_FUNCTION_TRACER
Frederic Weisbecker48d68b22008-12-02 00:20:39 +010056 select HAVE_FUNCTION_GRAPH_TRACER
Steven Rostedt71e308a2009-06-18 12:45:08 -040057 select HAVE_FUNCTION_GRAPH_FP_TEST
Josh Stone66700002009-08-24 14:43:11 -070058 select HAVE_SYSCALL_TRACEPOINTS
Catalin Marinas7ac57a82012-10-08 16:28:16 -070059 select SYSCTL_EXCEPTION_TRACE
Ingo Molnare0ec9482009-01-27 17:01:14 +010060 select HAVE_KVM
Ingo Molnar49793b02009-01-27 17:02:29 +010061 select HAVE_ARCH_KGDB
Roland McGrath99bbc4b2008-04-20 14:35:12 -070062 select HAVE_ARCH_TRACEHOOK
Dmitry Baryshkov323ec002008-06-29 14:19:31 +040063 select HAVE_GENERIC_DMA_COHERENT if X86_32
Johannes Berg58340a02008-07-25 01:45:33 -070064 select HAVE_EFFICIENT_UNALIGNED_ACCESS
Török Edwin8d264872008-11-23 12:39:08 +020065 select USER_STACKTRACE_SUPPORT
Heiko Carstensf850c30c2010-02-10 17:25:17 +010066 select HAVE_REGS_AND_STACK_ACCESS_API
Joerg Roedel2118d0c2009-01-09 15:13:15 +010067 select HAVE_DMA_API_DEBUG
H. Peter Anvin2e9f3bd2009-01-04 15:41:25 -080068 select HAVE_KERNEL_GZIP
69 select HAVE_KERNEL_BZIP2
70 select HAVE_KERNEL_LZMA
Lasse Collin30314802011-01-12 17:01:24 -080071 select HAVE_KERNEL_XZ
Albin Tonnerre13510992010-01-08 14:42:45 -080072 select HAVE_KERNEL_LZO
Kyungsik Leef9b493a2013-07-08 16:01:48 -070073 select HAVE_KERNEL_LZ4
K.Prasad0067f122009-06-01 23:43:57 +053074 select HAVE_HW_BREAKPOINT
Frederic Weisbecker01027522010-04-11 18:55:56 +020075 select HAVE_MIXED_BREAKPOINTS_REGS
Frederic Weisbecker99e8c5a2009-12-17 01:33:54 +010076 select PERF_EVENTS
Frederic Weisbeckerc01d4322010-05-15 22:57:48 +020077 select HAVE_PERF_EVENTS_NMI
Jiri Olsac5e63192012-08-07 15:20:36 +020078 select HAVE_PERF_REGS
Jiri Olsac5ebced2012-08-07 15:20:40 +020079 select HAVE_PERF_USER_STACK_DUMP
Catalin Marinasb69ec422012-10-08 16:28:11 -070080 select HAVE_DEBUG_KMEMLEAK
Frederic Weisbecker99e8c5a2009-12-17 01:33:54 +010081 select ANON_INODES
H. Peter Anvineb068e72012-11-28 11:50:23 -080082 select HAVE_ALIGNED_STRUCT_PAGE if SLUB
83 select HAVE_CMPXCHG_LOCAL
Heiko Carstens25654092012-01-12 17:17:33 -080084 select HAVE_CMPXCHG_DOUBLE
Pekka Enberg0a4af3b2009-02-26 21:38:56 +020085 select HAVE_ARCH_KMEMCHECK
Avi Kivity7c68af62009-09-19 09:40:22 +030086 select HAVE_USER_RETURN_NOTIFIER
David Daneye39f5602012-01-10 15:10:21 -080087 select ARCH_BINFMT_ELF_RANDOMIZE_PIE
Steven Rostedt46eb3b62010-09-22 23:10:23 -040088 select HAVE_ARCH_JUMP_LABEL
Catalin Marinas74634492012-07-30 14:41:09 -070089 select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
Yinghai Lu141d55e2011-10-12 11:53:17 -070090 select SPARSE_IRQ
Jan Beulichc49aa5b2011-03-08 09:24:26 +000091 select GENERIC_FIND_FIRST_BIT
Thomas Gleixner3bb98082010-09-27 12:46:02 +000092 select GENERIC_IRQ_PROBE
93 select GENERIC_PENDING_IRQ if SMP
Thomas Gleixner517e4982010-12-16 17:59:57 +010094 select GENERIC_IRQ_SHOW
Martin Schwidefskyd1748302011-08-23 15:29:42 +020095 select GENERIC_CLOCKEVENTS_MIN_ADJUST
Thomas Gleixnerc01858082011-02-07 02:24:08 +010096 select IRQ_FORCED_THREADING
Sam Ravnborge47b65b2012-05-21 20:45:37 +020097 select HAVE_BPF_JIT if X86_64
Gerald Schaefer15626062012-10-08 16:30:04 -070098 select HAVE_ARCH_TRANSPARENT_HUGEPAGE
Laura Abbott308c09f2014-08-08 14:23:25 -070099 select ARCH_HAS_SG_CHAIN
Thomas Gleixner0a779c52011-06-09 13:08:26 +0000100 select CLKEVT_I8253
Huang Yingdf013ff2011-07-13 13:14:22 +0800101 select ARCH_HAVE_NMI_SAFE_CMPXCHG
Michael S. Tsirkin4673ca82011-11-24 14:54:28 +0200102 select GENERIC_IOMAP
Linus Torvaldse419b4c2012-05-03 10:16:43 -0700103 select DCACHE_WORD_ACCESS
Thomas Gleixner7eb43a62012-04-20 13:05:48 +0000104 select GENERIC_SMP_IDLE_THREAD
Will Deaconc1d7e012012-07-30 14:42:46 -0700105 select ARCH_WANT_IPC_PARSE_VERSION if X86_32
Will Drewryc6cfbeb2012-04-12 16:48:03 -0500106 select HAVE_ARCH_SECCOMP_FILTER
David Daney8b5ad472012-04-24 11:23:15 -0700107 select BUILDTIME_EXTABLE_SORT
Thomas Gleixnerbdebaf82012-05-18 16:45:44 +0000108 select GENERIC_CMOS_UPDATE
Cyrill Gorcunov2bf01f92014-06-04 16:08:16 -0700109 select HAVE_ARCH_SOFT_DIRTY if X86_64
Thomas Gleixnerbdebaf82012-05-18 16:45:44 +0000110 select CLOCKSOURCE_WATCHDOG
111 select GENERIC_CLOCKEVENTS
Stefani Seiboldd2312e32014-03-17 23:22:01 +0100112 select ARCH_CLOCKSOURCE_DATA
Thomas Gleixner09ec5442014-07-16 21:05:12 +0000113 select CLOCKSOURCE_VALIDATE_LAST_CYCLE
Thomas Gleixnerbdebaf82012-05-18 16:45:44 +0000114 select GENERIC_CLOCKEVENTS_BROADCAST if X86_64 || (X86_32 && X86_LOCAL_APIC)
Stefani Seiboldd2312e32014-03-17 23:22:01 +0100115 select GENERIC_TIME_VSYSCALL
Linus Torvalds4ae73f22012-05-26 10:14:39 -0700116 select GENERIC_STRNCPY_FROM_USER
Linus Torvalds5723aa92012-05-26 11:09:53 -0700117 select GENERIC_STRNLEN_USER
Frederic Weisbecker91d1aa432012-11-27 19:33:25 +0100118 select HAVE_CONTEXT_TRACKING if X86_64
Frederic Weisbeckerfdf9c352012-09-09 14:56:31 +0200119 select HAVE_IRQ_TIME_ACCOUNTING
Stephen Rothwell4febd952013-03-07 15:48:16 +1100120 select VIRT_TO_BUS
David Howells786d35d2012-09-28 14:31:03 +0930121 select MODULES_USE_ELF_REL if X86_32
122 select MODULES_USE_ELF_RELA if X86_64
Al Viro1d4b4b22012-10-22 22:34:11 -0400123 select CLONE_BACKWARDS if X86_32
David Woodhouse83a57a42012-12-20 01:16:20 +0000124 select ARCH_USE_BUILTIN_BSWAP
Waiman Longbd01ec12014-02-03 13:18:57 +0100125 select ARCH_USE_QUEUE_RWLOCK
Al Viro15ce1f72012-12-25 16:09:20 -0500126 select OLD_SIGSUSPEND3 if X86_32 || IA32_EMULATION
Al Viro5b3eb3a2012-12-25 19:14:55 -0500127 select OLD_SIGACTION if X86_32
128 select COMPAT_OLD_SIGACTION if IA32_EMULATION
Prarit Bhargava3195ef52013-02-14 12:02:54 -0500129 select RTC_LIB
Dave Hansend1a1dc02013-07-01 13:04:42 -0700130 select HAVE_DEBUG_STACKOVERFLOW
Frederic Weisbeckera2cd11f2013-09-24 17:18:36 +0200131 select HAVE_IRQ_EXIT_ON_IRQ_STACK if X86_64
Kees Cook19952a92013-12-19 11:35:58 -0800132 select HAVE_CC_STACKPROTECTOR
Ard Biesheuvel2b9c1f02014-02-08 13:34:10 +0100133 select GENERIC_CPU_AUTOPROBE
AKASHI Takahiro7a017722014-02-25 18:16:24 +0900134 select HAVE_ARCH_AUDITSYSCALL
Peter Zijlstra4badad32014-06-06 19:53:16 +0200135 select ARCH_SUPPORTS_ATOMIC_RMW
Tomasz Nowicki44a69f62014-07-22 11:20:12 +0200136 select HAVE_ACPI_APEI if ACPI
137 select HAVE_ACPI_APEI_NMI if ACPI
Graeme Gregory8a1664b2014-07-18 18:02:52 +0800138 select ACPI_LEGACY_TABLES_LOOKUP if ACPI
Josh Triplett9def39be2013-10-30 08:09:45 -0700139 select X86_FEATURE_NAMES if PROC_FS
Balbir Singh7d8330a2008-02-10 12:46:28 +0530140
Ingo Molnarba7e4d12009-06-06 13:58:12 +0200141config INSTRUCTION_DECODER
Jan Beulich3120e252012-09-10 12:41:45 +0100142 def_bool y
143 depends on KPROBES || PERF_EVENTS || UPROBES
Ingo Molnarba7e4d12009-06-06 13:58:12 +0200144
Peter Zijlstra7fb0f1d2014-10-24 09:12:35 +0200145config PERF_EVENTS_INTEL_UNCORE
146 def_bool y
Peter Zijlstra (Intel)ce5686d2014-10-29 11:17:04 +0100147 depends on PERF_EVENTS && CPU_SUP_INTEL && PCI
Peter Zijlstra7fb0f1d2014-10-24 09:12:35 +0200148
Linus Torvalds51b26ad2009-04-26 10:12:47 -0700149config OUTPUT_FORMAT
150 string
151 default "elf32-i386" if X86_32
152 default "elf64-x86-64" if X86_64
153
Sam Ravnborg73531902008-05-25 23:03:18 +0200154config ARCH_DEFCONFIG
Sam Ravnborgb9b39bf2008-04-29 12:48:15 +0200155 string
Sam Ravnborg73531902008-05-25 23:03:18 +0200156 default "arch/x86/configs/i386_defconfig" if X86_32
157 default "arch/x86/configs/x86_64_defconfig" if X86_64
Sam Ravnborgb9b39bf2008-04-29 12:48:15 +0200158
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100159config LOCKDEP_SUPPORT
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100160 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100161
162config STACKTRACE_SUPPORT
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100163 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100164
Heiko Carstensaa7d9352008-02-01 17:45:14 +0100165config HAVE_LATENCYTOP_SUPPORT
166 def_bool y
167
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100168config MMU
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100169 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100170
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100171config SBUS
172 bool
173
FUJITA Tomonori3bc4e452010-03-10 15:23:22 -0800174config NEED_DMA_MAP_STATE
Jan Beulich3120e252012-09-10 12:41:45 +0100175 def_bool y
176 depends on X86_64 || INTEL_IOMMU || DMA_API_DEBUG
FUJITA Tomonori3bc4e452010-03-10 15:23:22 -0800177
FUJITA Tomonori18e98302010-05-26 14:44:32 -0700178config NEED_SG_DMA_LENGTH
Andrew Morton4a14d842010-05-26 14:44:33 -0700179 def_bool y
FUJITA Tomonori18e98302010-05-26 14:44:32 -0700180
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100181config GENERIC_ISA_DMA
Jan Beulich3120e252012-09-10 12:41:45 +0100182 def_bool y
183 depends on ISA_DMA_API
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100184
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100185config GENERIC_BUG
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100186 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100187 depends on BUG
Jan Beulichb93a5312008-12-16 11:40:27 +0000188 select GENERIC_BUG_RELATIVE_POINTERS if X86_64
189
190config GENERIC_BUG_RELATIVE_POINTERS
191 bool
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100192
193config GENERIC_HWEIGHT
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100194 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100195
196config ARCH_MAY_HAVE_PC_FDC
Jan Beulich3120e252012-09-10 12:41:45 +0100197 def_bool y
198 depends on ISA_DMA_API
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100199
Sam Ravnborg1032c0b2007-11-06 21:35:08 +0100200config RWSEM_XCHGADD_ALGORITHM
Jan Beulich3120e252012-09-10 12:41:45 +0100201 def_bool y
Sam Ravnborg1032c0b2007-11-06 21:35:08 +0100202
Sam Ravnborg1032c0b2007-11-06 21:35:08 +0100203config GENERIC_CALIBRATE_DELAY
204 def_bool y
205
venkatesh.pallipadi@intel.com9a0b8412008-01-31 17:35:06 -0800206config ARCH_HAS_CPU_RELAX
207 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100208
Pekka Enberg1b27d052008-04-28 02:12:22 -0700209config ARCH_HAS_CACHE_LINE_SIZE
210 def_bool y
211
Mike Travisdd5af902008-01-30 13:33:32 +0100212config HAVE_SETUP_PER_CPU_AREA
Brian Gerst89c9c4c2009-01-27 12:56:48 +0900213 def_bool y
travis@sgi.comb32ef632008-01-30 13:32:51 +0100214
Tejun Heo08fc4582009-08-14 15:00:49 +0900215config NEED_PER_CPU_EMBED_FIRST_CHUNK
216 def_bool y
217
218config NEED_PER_CPU_PAGE_FIRST_CHUNK
Tejun Heo11124412009-02-20 16:29:09 +0900219 def_bool y
220
Johannes Berg801e4062007-12-08 02:12:39 +0100221config ARCH_HIBERNATION_POSSIBLE
222 def_bool y
Johannes Berg801e4062007-12-08 02:12:39 +0100223
Johannes Bergf4cb5702007-12-08 02:14:00 +0100224config ARCH_SUSPEND_POSSIBLE
225 def_bool y
Johannes Bergf4cb5702007-12-08 02:14:00 +0100226
Steve Cappercfe28c52013-04-29 14:29:48 +0100227config ARCH_WANT_HUGE_PMD_SHARE
228 def_bool y
229
Steve Capper53313b22013-04-30 08:03:42 +0100230config ARCH_WANT_GENERAL_HUGETLB
231 def_bool y
232
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100233config ZONE_DMA32
234 bool
235 default X86_64
236
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100237config AUDIT_ARCH
238 bool
239 default X86_64
240
Ingo Molnar765c68b2008-04-09 11:03:37 +0200241config ARCH_SUPPORTS_OPTIMIZED_INLINING
242 def_bool y
243
Akinobu Mita6a11f752009-03-31 15:23:17 -0700244config ARCH_SUPPORTS_DEBUG_PAGEALLOC
245 def_bool y
246
Shane Wang69575d32009-09-01 18:25:07 -0700247config HAVE_INTEL_TXT
248 def_bool y
Kees Cook6ea30382012-10-02 11:16:47 -0700249 depends on INTEL_IOMMU && ACPI
Shane Wang69575d32009-09-01 18:25:07 -0700250
Qiaowei Ren57319d82014-11-14 07:18:27 -0800251config X86_INTEL_MPX
252 def_bool y
253 depends on CPU_SUP_INTEL
254
Sam Ravnborg6b0c3d42008-01-30 13:32:27 +0100255config X86_32_SMP
256 def_bool y
257 depends on X86_32 && SMP
258
259config X86_64_SMP
260 def_bool y
261 depends on X86_64 && SMP
262
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100263config X86_HT
Jan Beulich6fc108a2010-04-21 15:23:44 +0100264 def_bool y
Adrian Bunkee0011a2007-12-04 17:19:07 +0100265 depends on SMP
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100266
Tejun Heoccbeed32009-02-09 22:17:40 +0900267config X86_32_LAZY_GS
268 def_bool y
Tejun Heo60a53172009-02-09 22:17:40 +0900269 depends on X86_32 && !CC_STACKPROTECTOR
Tejun Heoccbeed32009-02-09 22:17:40 +0900270
Borislav Petkovd61931d2010-03-05 17:34:46 +0100271config ARCH_HWEIGHT_CFLAGS
272 string
273 default "-fcall-saved-ecx -fcall-saved-edx" if X86_32
274 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
275
Srikar Dronamraju2b144492012-02-09 14:56:42 +0530276config ARCH_SUPPORTS_UPROBES
277 def_bool y
278
Rob Herringd20642f2014-04-18 17:19:54 -0500279config FIX_EARLYCON_MEM
280 def_bool y
281
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100282source "init/Kconfig"
Matt Helsleydc52ddc2008-10-18 20:27:21 -0700283source "kernel/Kconfig.freezer"
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100284
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100285menu "Processor type and features"
286
Randy Dunlap5ee71532012-01-16 11:57:18 -0800287config ZONE_DMA
288 bool "DMA memory allocation support" if EXPERT
289 default y
290 help
291 DMA memory allocation support allows devices with less than 32-bit
292 addressing to allocate within the first 16MB of address space.
293 Disable if no such devices will be used.
294
295 If unsure, say Y.
296
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100297config SMP
298 bool "Symmetric multi-processing support"
299 ---help---
300 This enables support for systems with more than one CPU. If you have
Robert Graffham4a474152014-01-23 15:55:29 -0800301 a system with only one CPU, say N. If you have a system with more
302 than one CPU, say Y.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100303
Robert Graffham4a474152014-01-23 15:55:29 -0800304 If you say N here, the kernel will run on uni- and multiprocessor
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100305 machines, but will use only one CPU of a multiprocessor machine. If
306 you say Y here, the kernel will run on many, but not all,
Robert Graffham4a474152014-01-23 15:55:29 -0800307 uniprocessor machines. On a uniprocessor machine, the kernel
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100308 will run faster if you say N here.
309
310 Note that if you say Y here and choose architecture "586" or
311 "Pentium" under "Processor family", the kernel will not work on 486
312 architectures. Similarly, multiprocessor kernels for the "PPro"
313 architecture may not work on all Pentium based boards.
314
315 People using multiprocessor machines who say Y here should also say
316 Y to "Enhanced Real Time Clock Support", below. The "Advanced Power
317 Management" code will be disabled if you say Y here.
318
Paul Bolle395cf962011-08-15 02:02:26 +0200319 See also <file:Documentation/x86/i386/IO-APIC.txt>,
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100320 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
321 <http://www.tldp.org/docs.html#howto>.
322
323 If you don't know what to do here, say N.
324
Josh Triplett9def39be2013-10-30 08:09:45 -0700325config X86_FEATURE_NAMES
326 bool "Processor feature human-readable names" if EMBEDDED
327 default y
328 ---help---
329 This option compiles in a table of x86 feature bits and corresponding
330 names. This is required to support /proc/cpuinfo and a few kernel
331 messages. You can disable this to save space, at the expense of
332 making those few kernel messages show numeric feature bits instead.
333
334 If in doubt, say Y.
335
Yinghai Lu06cd9a72009-02-16 17:29:58 -0800336config X86_X2APIC
337 bool "Support x2apic"
Suresh Siddhad3f13812011-08-23 17:05:25 -0700338 depends on X86_LOCAL_APIC && X86_64 && IRQ_REMAP
Yinghai Lu06cd9a72009-02-16 17:29:58 -0800339 ---help---
340 This enables x2apic support on CPUs that have this feature.
341
342 This allows 32-bit apic IDs (so it can support very large systems),
343 and accesses the local apic via MSRs not via mmio.
344
Yinghai Lu06cd9a72009-02-16 17:29:58 -0800345 If you don't know what to do here, say N.
346
Yinghai Lu6695c852008-06-19 12:13:09 -0700347config X86_MPPARSE
Bin Gao6e87f9b72012-10-25 09:35:44 -0700348 bool "Enable MPS table" if ACPI || SFI
Jan Beulich7a527682008-10-30 10:38:24 +0000349 default y
Ingo Molnar5ab74722008-07-10 14:42:03 +0200350 depends on X86_LOCAL_APIC
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100351 ---help---
Yinghai Lu6695c852008-06-19 12:13:09 -0700352 For old smp systems that do not have proper acpi support. Newer systems
353 (esp with 64bit cpus) with acpi support, MADT and DSDT will override it
Yinghai Lu6695c852008-06-19 12:13:09 -0700354
Yinghai Lu26f7ef12009-01-29 14:19:22 -0800355config X86_BIGSMP
356 bool "Support for big SMP systems with more than 8 CPUs"
357 depends on X86_32 && SMP
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100358 ---help---
Yinghai Lu26f7ef12009-01-29 14:19:22 -0800359 This option is needed for the systems that have more than 8 CPUs
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100360
Jun Nakajimaddd70cf2013-01-21 17:23:09 +0000361config GOLDFISH
362 def_bool y
363 depends on X86_GOLDFISH
364
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800365if X86_32
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800366config X86_EXTENDED_PLATFORM
367 bool "Support for extended (non-PC) x86 platforms"
368 default y
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100369 ---help---
Ingo Molnar06ac8342009-01-27 18:11:43 +0100370 If you disable this option then the kernel will only support
371 standard PC platforms. (which covers the vast majority of
372 systems out there.)
373
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800374 If you enable this option then you'll be able to select support
375 for the following (non-PC) 32 bit x86 platforms:
Ben Hutchingscb7b8022013-06-24 01:05:25 +0100376 Goldfish (Android emulator)
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800377 AMD Elan
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800378 RDC R-321x SoC
379 SGI 320/540 (Visual Workstation)
Alessandro Rubini83125a32012-04-04 19:40:21 +0200380 STA2X11-based (e.g. Northville)
Thomas Gleixner3f4110a2009-08-29 14:54:20 +0200381 Moorestown MID devices
Ingo Molnar06ac8342009-01-27 18:11:43 +0100382
383 If you have one of these systems, or if you want to build a
384 generic distribution kernel, say Y here - otherwise say N.
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800385endif
Ingo Molnar06ac8342009-01-27 18:11:43 +0100386
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800387if X86_64
388config X86_EXTENDED_PLATFORM
389 bool "Support for extended (non-PC) x86 platforms"
390 default y
391 ---help---
392 If you disable this option then the kernel will only support
393 standard PC platforms. (which covers the vast majority of
394 systems out there.)
395
396 If you enable this option then you'll be able to select support
397 for the following (non-PC) 64 bit x86 platforms:
Steffen Persvold44b111b52011-12-06 00:07:26 +0800398 Numascale NumaChip
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800399 ScaleMP vSMP
400 SGI Ultraviolet
401
402 If you have one of these systems, or if you want to build a
403 generic distribution kernel, say Y here - otherwise say N.
404endif
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800405# This is an alphabetically sorted list of 64 bit extended platforms
406# Please maintain the alphabetic order if and when there are additions
Steffen Persvold44b111b52011-12-06 00:07:26 +0800407config X86_NUMACHIP
408 bool "Numascale NumaChip"
409 depends on X86_64
410 depends on X86_EXTENDED_PLATFORM
411 depends on NUMA
412 depends on SMP
413 depends on X86_X2APIC
Daniel J Bluemanf9726bf2012-12-07 14:24:32 -0700414 depends on PCI_MMCONFIG
Steffen Persvold44b111b52011-12-06 00:07:26 +0800415 ---help---
416 Adds support for Numascale NumaChip large-SMP systems. Needed to
417 enable more than ~168 cores.
418 If you don't have one of these, you should say N here.
Nick Piggin03b48632009-01-20 04:36:04 +0100419
Ingo Molnar6a485652009-01-27 18:29:13 +0100420config X86_VSMP
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800421 bool "ScaleMP vSMP"
Borislav Petkov6276a072013-03-04 21:20:21 +0100422 select HYPERVISOR_GUEST
Ingo Molnar6a485652009-01-27 18:29:13 +0100423 select PARAVIRT
424 depends on X86_64 && PCI
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800425 depends on X86_EXTENDED_PLATFORM
Shai Fultheimead91d42012-04-16 10:39:35 +0300426 depends on SMP
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100427 ---help---
Ingo Molnar6a485652009-01-27 18:29:13 +0100428 Support for ScaleMP vSMP systems. Say 'Y' here if this kernel is
429 supposed to run on these EM64T-based machines. Only choose this option
430 if you have one of these machines.
431
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800432config X86_UV
433 bool "SGI Ultraviolet"
434 depends on X86_64
435 depends on X86_EXTENDED_PLATFORM
Jack Steiner54c28d22009-04-03 15:39:42 -0500436 depends on NUMA
Suresh Siddha9d6c26e2009-04-20 13:02:31 -0700437 depends on X86_X2APIC
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800438 ---help---
439 This option is needed in order to support SGI Ultraviolet systems.
440 If you don't have one of these, you should say N here.
441
442# Following is an alphabetically sorted list of 32 bit extended platforms
443# Please maintain the alphabetic order if and when there are additions
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100444
Jun Nakajimaddd70cf2013-01-21 17:23:09 +0000445config X86_GOLDFISH
446 bool "Goldfish (Virtual Platform)"
Ben Hutchingscb7b8022013-06-24 01:05:25 +0100447 depends on X86_EXTENDED_PLATFORM
Jun Nakajimaddd70cf2013-01-21 17:23:09 +0000448 ---help---
449 Enable support for the Goldfish virtual platform used primarily
450 for Android development. Unless you are building for the Android
451 Goldfish emulator say N here.
452
Thomas Gleixnerc751e172010-11-09 12:08:04 -0800453config X86_INTEL_CE
454 bool "CE4100 TV platform"
455 depends on PCI
456 depends on PCI_GODIRECT
Jiang Liu6084a6e2014-06-09 16:19:46 +0800457 depends on X86_IO_APIC
Thomas Gleixnerc751e172010-11-09 12:08:04 -0800458 depends on X86_32
459 depends on X86_EXTENDED_PLATFORM
Dirk Brandewie37bc9f52010-11-09 12:08:08 -0800460 select X86_REBOOTFIXUPS
Sebastian Andrzej Siewiorda6b7372011-02-22 21:07:37 +0100461 select OF
462 select OF_EARLY_FLATTREE
Grant Likelyb4e51852011-12-16 15:50:17 -0700463 select IRQ_DOMAIN
Thomas Gleixnerc751e172010-11-09 12:08:04 -0800464 ---help---
465 Select for the Intel CE media processor (CE4100) SOC.
466 This option compiles in support for the CE4100 SOC for settop
467 boxes and media devices.
468
David Cohen4cb9b002013-12-16 17:37:26 -0800469config X86_INTEL_MID
Alan Cox43605ef2011-07-12 17:49:29 +0100470 bool "Intel MID platform support"
471 depends on X86_32
472 depends on X86_EXTENDED_PLATFORM
David Cohenedc6bc72014-01-21 10:41:39 -0800473 depends on X86_PLATFORM_DEVICES
Alan Cox1ea7c672011-11-10 13:29:14 +0000474 depends on PCI
475 depends on PCI_GOANY
476 depends on X86_IO_APIC
Alan Cox7c9c3a12011-12-29 14:43:16 +0000477 select SFI
David Cohen4cb9b002013-12-16 17:37:26 -0800478 select I2C
Alan Cox7c9c3a12011-12-29 14:43:16 +0000479 select DW_APB_TIMER
Alan Cox1ea7c672011-11-10 13:29:14 +0000480 select APB_TIMER
Alan Cox1ea7c672011-11-10 13:29:14 +0000481 select INTEL_SCU_IPC
Mika Westerberg15a713d2012-01-26 17:35:05 +0000482 select MFD_INTEL_MSIC
Alan Cox1ea7c672011-11-10 13:29:14 +0000483 ---help---
David Cohen4cb9b002013-12-16 17:37:26 -0800484 Select to build a kernel capable of supporting Intel MID (Mobile
485 Internet Device) platform systems which do not have the PCI legacy
486 interfaces. If you are building for a PC class system say N here.
Alan Cox1ea7c672011-11-10 13:29:14 +0000487
David Cohen4cb9b002013-12-16 17:37:26 -0800488 Intel MID platforms are based on an Intel processor and chipset which
489 consume less power than most of the x86 derivatives.
Alan Cox43605ef2011-07-12 17:49:29 +0100490
Mika Westerberg3d48aab2013-01-18 13:45:59 +0000491config X86_INTEL_LPSS
492 bool "Intel Low Power Subsystem Support"
493 depends on ACPI
494 select COMMON_CLK
Mathias Nyman0f531432013-09-13 17:02:29 +0300495 select PINCTRL
Mika Westerberg3d48aab2013-01-18 13:45:59 +0000496 ---help---
497 Select to build support for Intel Low Power Subsystem such as
498 found on Intel Lynxpoint PCH. Selecting this option enables
Mathias Nyman0f531432013-09-13 17:02:29 +0300499 things like clock tree (common clock framework) and pincontrol
500 which are needed by the LPSS peripheral drivers.
Mika Westerberg3d48aab2013-01-18 13:45:59 +0000501
David E. Boxced3ce72014-09-17 22:13:50 -0700502config IOSF_MBI
503 tristate "Intel SoC IOSF Sideband support for SoC platforms"
504 depends on PCI
505 ---help---
506 This option enables sideband register access support for Intel SoC
507 platforms. On these platforms the IOSF sideband is used in lieu of
508 MSR's for some register accesses, mostly but not limited to thermal
509 and power. Drivers may query the availability of this device to
510 determine if they need the sideband in order to work on these
511 platforms. The sideband is available on the following SoC products.
512 This list is not meant to be exclusive.
513 - BayTrail
514 - Braswell
515 - Quark
516
517 You should say Y if you are running a kernel on one of these SoC's.
518
David E. Boxed2226b2014-09-17 22:13:51 -0700519config IOSF_MBI_DEBUG
520 bool "Enable IOSF sideband access through debugfs"
521 depends on IOSF_MBI && DEBUG_FS
522 ---help---
523 Select this option to expose the IOSF sideband access registers (MCR,
524 MDR, MCRX) through debugfs to write and read register information from
525 different units on the SoC. This is most useful for obtaining device
526 state information for debug and analysis. As this is a general access
527 mechanism, users of this option would have specific knowledge of the
528 device they want to access.
529
530 If you don't require the option or are in doubt, say N.
531
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800532config X86_RDC321X
533 bool "RDC R-321x SoC"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100534 depends on X86_32
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800535 depends on X86_EXTENDED_PLATFORM
536 select M486
537 select X86_REBOOTFIXUPS
538 ---help---
539 This option is needed for RDC R-321x system-on-chip, also known
540 as R-8610-(G).
541 If you don't have one of these chips, you should say N here.
542
Ingo Molnare0c7ae32009-01-27 18:43:09 +0100543config X86_32_NON_STANDARD
Ingo Molnar9c398012009-01-27 18:24:57 +0100544 bool "Support non-standard 32-bit SMP architectures"
545 depends on X86_32 && SMP
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800546 depends on X86_EXTENDED_PLATFORM
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100547 ---help---
H. Peter Anvinb5660ba2014-02-25 12:14:06 -0800548 This option compiles in the bigsmp and STA2X11 default
549 subarchitectures. It is intended for a generic binary
550 kernel. If you select them all, kernel will probe it one by
551 one and will fallback to default.
Yinghai Lud49c4282008-06-08 18:31:54 -0700552
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800553# Alphabetically sorted list of Non standard 32 bit platforms
Yinghai Lud49c4282008-06-08 18:31:54 -0700554
Linus Torvaldsd949f362009-09-26 09:35:07 -0700555config X86_SUPPORTS_MEMORY_FAILURE
Jan Beulich6fc108a2010-04-21 15:23:44 +0100556 def_bool y
Linus Torvaldsd949f362009-09-26 09:35:07 -0700557 # MCE code calls memory_failure():
558 depends on X86_MCE
559 # On 32-bit this adds too big of NODES_SHIFT and we run out of page flags:
Linus Torvaldsd949f362009-09-26 09:35:07 -0700560 # On 32-bit SPARSEMEM adds too big of SECTIONS_WIDTH:
561 depends on X86_64 || !SPARSEMEM
562 select ARCH_SUPPORTS_MEMORY_FAILURE
Linus Torvaldsd949f362009-09-26 09:35:07 -0700563
Alessandro Rubini83125a32012-04-04 19:40:21 +0200564config STA2X11
565 bool "STA2X11 Companion Chip Support"
566 depends on X86_32_NON_STANDARD && PCI
567 select X86_DEV_DMA_OPS
568 select X86_DMA_REMAP
569 select SWIOTLB
570 select MFD_STA2X11
571 select ARCH_REQUIRE_GPIOLIB
572 default n
573 ---help---
574 This adds support for boards based on the STA2X11 IO-Hub,
575 a.k.a. "ConneXt". The chip is used in place of the standard
576 PC chipset, so all "standard" peripherals are missing. If this
577 option is selected the kernel will still be able to boot on
578 standard PC machines.
579
Shérab82148d12010-09-25 06:06:57 +0200580config X86_32_IRIS
581 tristate "Eurobraille/Iris poweroff module"
582 depends on X86_32
583 ---help---
584 The Iris machines from EuroBraille do not have APM or ACPI support
585 to shut themselves down properly. A special I/O sequence is
586 needed to do so, which is what this module does at
587 kernel shutdown.
588
589 This is only for Iris machines from EuroBraille.
590
591 If unused, say N.
592
Ingo Molnarae1e9132008-11-11 09:05:16 +0100593config SCHED_OMIT_FRAME_POINTER
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100594 def_bool y
595 prompt "Single-depth WCHAN output"
Ken Chena87d0912008-11-06 11:10:49 -0800596 depends on X86
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100597 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100598 Calculate simpler /proc/<PID>/wchan values. If this option
599 is disabled then wchan values will recurse back to the
600 caller function. This provides more accurate wchan values,
601 at the expense of slightly more scheduling overhead.
602
603 If in doubt, say "Y".
604
Borislav Petkov6276a072013-03-04 21:20:21 +0100605menuconfig HYPERVISOR_GUEST
606 bool "Linux guest support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100607 ---help---
Borislav Petkov6276a072013-03-04 21:20:21 +0100608 Say Y here to enable options for running Linux under various hyper-
609 visors. This option enables basic hypervisor detection and platform
610 setup.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100611
Borislav Petkov6276a072013-03-04 21:20:21 +0100612 If you say N, all options in this submenu will be skipped and
613 disabled, and Linux guest support won't be built in.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100614
Borislav Petkov6276a072013-03-04 21:20:21 +0100615if HYPERVISOR_GUEST
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100616
Eduardo Pereira Habkoste61bd942008-01-30 13:33:32 +0100617config PARAVIRT
618 bool "Enable paravirtualization code"
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100619 ---help---
Eduardo Pereira Habkoste61bd942008-01-30 13:33:32 +0100620 This changes the kernel so it can modify itself when it is run
621 under a hypervisor, potentially improving performance significantly
622 over full virtualization. However, when run without a hypervisor
623 the kernel is theoretically slower and slightly larger.
624
Borislav Petkov6276a072013-03-04 21:20:21 +0100625config PARAVIRT_DEBUG
626 bool "paravirt-ops debugging"
627 depends on PARAVIRT && DEBUG_KERNEL
628 ---help---
629 Enable to debug paravirt_ops internals. Specifically, BUG if
630 a paravirt_op is missing when it is called.
631
Jeremy Fitzhardingeb4ecc122009-05-13 17:16:55 -0700632config PARAVIRT_SPINLOCKS
633 bool "Paravirtualization layer for spinlocks"
Kees Cook6ea30382012-10-02 11:16:47 -0700634 depends on PARAVIRT && SMP
Raghavendra K T8db73262013-08-09 19:51:50 +0530635 select UNINLINE_SPIN_UNLOCK
Jeremy Fitzhardingeb4ecc122009-05-13 17:16:55 -0700636 ---help---
637 Paravirtualized spinlocks allow a pvops backend to replace the
638 spinlock implementation with something virtualization-friendly
639 (for example, block the virtual CPU rather than spinning).
640
Raghavendra K T4c4e4f62013-10-21 21:35:08 +0530641 It has a minimal impact on native kernels and gives a nice performance
642 benefit on paravirtualized KVM / Xen kernels.
Jeremy Fitzhardingeb4ecc122009-05-13 17:16:55 -0700643
Raghavendra K T4c4e4f62013-10-21 21:35:08 +0530644 If you are unsure how to answer this question, answer Y.
Jeremy Fitzhardingeb4ecc122009-05-13 17:16:55 -0700645
Borislav Petkov6276a072013-03-04 21:20:21 +0100646source "arch/x86/xen/Kconfig"
647
648config KVM_GUEST
649 bool "KVM Guest support (including kvmclock)"
650 depends on PARAVIRT
651 select PARAVIRT_CLOCK
652 default y
653 ---help---
654 This option enables various optimizations for running under the KVM
655 hypervisor. It includes a paravirtualized clock, so that instead
656 of relying on a PIT (or probably other) emulation by the
657 underlying device model, the host provides the guest with
658 timing infrastructure such as time of day, and system time
659
Srivatsa Vaddagiri1e20eb82013-08-09 19:52:01 +0530660config KVM_DEBUG_FS
661 bool "Enable debug information for KVM Guests in debugfs"
662 depends on KVM_GUEST && DEBUG_FS
663 default n
664 ---help---
665 This option enables collection of various statistics for KVM guest.
666 Statistics are displayed in debugfs filesystem. Enabling this option
667 may incur significant overhead.
668
Borislav Petkov6276a072013-03-04 21:20:21 +0100669source "arch/x86/lguest/Kconfig"
670
671config PARAVIRT_TIME_ACCOUNTING
672 bool "Paravirtual steal time accounting"
673 depends on PARAVIRT
674 default n
675 ---help---
676 Select this option to enable fine granularity task steal time
677 accounting. Time spent executing other tasks in parallel with
678 the current vCPU is discounted from the vCPU power. To account for
679 that, there can be a small performance impact.
680
681 If in doubt, say N here.
682
Gerd Hoffmann7af192c2008-06-03 16:17:29 +0200683config PARAVIRT_CLOCK
684 bool
Gerd Hoffmann7af192c2008-06-03 16:17:29 +0200685
Borislav Petkov6276a072013-03-04 21:20:21 +0100686endif #HYPERVISOR_GUEST
Jeremy Fitzhardinge97349132008-06-25 00:19:14 -0400687
Yinghai Lu08677212010-02-10 01:20:20 -0800688config NO_BOOTMEM
Yinghai Lu774ea0b2010-08-25 13:39:18 -0700689 def_bool y
Yinghai Lu08677212010-02-10 01:20:20 -0800690
Yinghai Lu03273182008-04-18 17:49:15 -0700691config MEMTEST
692 bool "Memtest"
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100693 ---help---
Yinghai Luc64df702008-03-21 18:56:19 -0700694 This option adds a kernel parameter 'memtest', which allows memtest
Yinghai Lu03273182008-04-18 17:49:15 -0700695 to be set.
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100696 memtest=0, mean disabled; -- default
697 memtest=1, mean do 1 test pattern;
698 ...
699 memtest=4, mean do 4 test patterns.
Thomas Gleixneraba37282008-07-15 14:48:48 +0200700 If you are unsure how to answer this question, answer N.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100701
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100702source "arch/x86/Kconfig.cpu"
703
704config HPET_TIMER
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100705 def_bool X86_64
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100706 prompt "HPET Timer Support" if X86_32
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100707 ---help---
708 Use the IA-PC HPET (High Precision Event Timer) to manage
709 time in preference to the PIT and RTC, if a HPET is
710 present.
711 HPET is the next generation timer replacing legacy 8254s.
712 The HPET provides a stable time base on SMP
713 systems, unlike the TSC, but it is more expensive to access,
714 as it is off-chip. You can find the HPET spec at
715 <http://www.intel.com/hardwaredesign/hpetspec_1.pdf>.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100716
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100717 You can safely choose Y here. However, HPET will only be
718 activated if the platform and the BIOS support this feature.
719 Otherwise the 8254 will be used for timing services.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100720
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100721 Choose N to continue using the legacy 8254 timer.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100722
723config HPET_EMULATE_RTC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100724 def_bool y
Bernhard Walle9d8af782008-02-06 01:38:52 -0800725 depends on HPET_TIMER && (RTC=y || RTC=m || RTC_DRV_CMOS=m || RTC_DRV_CMOS=y)
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100726
Jacob Panbb24c472009-09-02 07:37:17 -0700727config APB_TIMER
Alan Cox933b9462011-12-17 17:43:40 +0000728 def_bool y if X86_INTEL_MID
729 prompt "Intel MID APB Timer Support" if X86_INTEL_MID
Jamie Iles06c3df42011-06-06 12:43:07 +0100730 select DW_APB_TIMER
Alan Coxa0c38322011-12-17 21:57:25 +0000731 depends on X86_INTEL_MID && SFI
Jacob Panbb24c472009-09-02 07:37:17 -0700732 help
733 APB timer is the replacement for 8254, HPET on X86 MID platforms.
734 The APBT provides a stable time base on SMP
735 systems, unlike the TSC, but it is more expensive to access,
736 as it is off-chip. APB timers are always running regardless of CPU
737 C states, they are used as per CPU clockevent device when possible.
738
David Rientjes6a108a12011-01-20 14:44:16 -0800739# Mark as expert because too many people got it wrong.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100740# The code disables itself when not needed.
Thomas Petazzoni7ae93922008-04-28 02:14:14 -0700741config DMI
742 default y
Ard Biesheuvelcf074402014-01-23 15:54:39 -0800743 select DMI_SCAN_MACHINE_NON_EFI_FALLBACK
David Rientjes6a108a12011-01-20 14:44:16 -0800744 bool "Enable DMI scanning" if EXPERT
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100745 ---help---
Thomas Petazzoni7ae93922008-04-28 02:14:14 -0700746 Enabled scanning of DMI to identify machine quirks. Say Y
747 here unless you have verified that your setup is not
748 affected by entries in the DMI blacklist. Required by PNP
749 BIOS code.
750
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100751config GART_IOMMU
Andi Kleen38901f12013-10-04 14:37:56 -0700752 bool "Old AMD GART IOMMU support"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100753 select SWIOTLB
Andreas Herrmann23ac4ae2010-09-17 18:03:43 +0200754 depends on X86_64 && PCI && AMD_NB
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100755 ---help---
Ingo Molnarced3c422013-10-06 11:45:20 +0200756 Provides a driver for older AMD Athlon64/Opteron/Turion/Sempron
757 GART based hardware IOMMUs.
758
759 The GART supports full DMA access for devices with 32-bit access
760 limitations, on systems with more than 3 GB. This is usually needed
761 for USB, sound, many IDE/SATA chipsets and some other devices.
762
763 Newer systems typically have a modern AMD IOMMU, supported via
764 the CONFIG_AMD_IOMMU=y config option.
765
766 In normal configurations this driver is only active when needed:
767 there's more than 3 GB of memory and the system contains a
768 32-bit limited device.
769
770 If unsure, say Y.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100771
772config CALGARY_IOMMU
773 bool "IBM Calgary IOMMU support"
774 select SWIOTLB
Kees Cook6ea30382012-10-02 11:16:47 -0700775 depends on X86_64 && PCI
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100776 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100777 Support for hardware IOMMUs in IBM's xSeries x366 and x460
778 systems. Needed to run systems with more than 3GB of memory
779 properly with 32-bit PCI devices that do not support DAC
780 (Double Address Cycle). Calgary also supports bus level
781 isolation, where all DMAs pass through the IOMMU. This
782 prevents them from going anywhere except their intended
783 destination. This catches hard-to-find kernel bugs and
784 mis-behaving drivers and devices that do not use the DMA-API
785 properly to set up their DMA buffers. The IOMMU can be
786 turned off at boot time with the iommu=off parameter.
787 Normally the kernel will make the right choice by itself.
788 If unsure, say Y.
789
790config CALGARY_IOMMU_ENABLED_BY_DEFAULT
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100791 def_bool y
792 prompt "Should Calgary be enabled by default?"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100793 depends on CALGARY_IOMMU
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100794 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100795 Should Calgary be enabled by default? if you choose 'y', Calgary
796 will be used (if it exists). If you choose 'n', Calgary will not be
797 used even if it exists. If you choose 'n' and would like to use
798 Calgary anyway, pass 'iommu=calgary' on the kernel command line.
799 If unsure, say Y.
800
801# need this always selected by IOMMU for the VIA workaround
802config SWIOTLB
Joerg Roedela1afd012008-11-18 12:44:21 +0100803 def_bool y if X86_64
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100804 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100805 Support for software bounce buffers used on x86-64 systems
Joe Millenbach4454d322012-09-02 17:38:20 -0700806 which don't have a hardware IOMMU. Using this PCI devices
807 which can only access 32-bits of memory can be used on systems
808 with more than 3 GB of memory.
809 If unsure, say Y.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100810
FUJITA Tomonoria8522502008-04-29 00:59:36 -0700811config IOMMU_HELPER
Jan Beulich3120e252012-09-10 12:41:45 +0100812 def_bool y
813 depends on CALGARY_IOMMU || GART_IOMMU || SWIOTLB || AMD_IOMMU
Linus Torvaldsd25e26b2008-08-25 14:15:38 -0700814
Mike Travis1184dc22008-05-12 21:21:12 +0200815config MAXSMP
Samuel Thibaultddb0c5a2010-08-21 21:32:41 +0200816 bool "Enable Maximum number of SMP Processors and NUMA Nodes"
Kees Cook6ea30382012-10-02 11:16:47 -0700817 depends on X86_64 && SMP && DEBUG_KERNEL
Mike Travis36f51012008-12-16 17:33:51 -0800818 select CPUMASK_OFFSTACK
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100819 ---help---
Samuel Thibaultddb0c5a2010-08-21 21:32:41 +0200820 Enable maximum number of CPUS and NUMA Nodes for this architecture.
Mike Travis1184dc22008-05-12 21:21:12 +0200821 If unsure, say N.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100822
823config NR_CPUS
Mike Travis36f51012008-12-16 17:33:51 -0800824 int "Maximum number of CPUs" if SMP && !MAXSMP
Michael K. Johnson2a3313f2009-04-21 21:44:48 -0400825 range 2 8 if SMP && X86_32 && !X86_BIGSMP
Josh Boyerbb61ccc2013-11-05 09:37:29 -0500826 range 2 512 if SMP && !MAXSMP && !CPUMASK_OFFSTACK
Josh Boyerb53b5ed2013-11-05 09:38:16 -0500827 range 2 8192 if SMP && !MAXSMP && CPUMASK_OFFSTACK && X86_64
Mike Travis78637a972008-12-16 17:34:00 -0800828 default "1" if !SMP
Josh Boyerb53b5ed2013-11-05 09:38:16 -0500829 default "8192" if MAXSMP
H. Peter Anvinb5660ba2014-02-25 12:14:06 -0800830 default "32" if SMP && X86_BIGSMP
Mike Travis78637a972008-12-16 17:34:00 -0800831 default "8" if SMP
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100832 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100833 This allows you to specify the maximum number of CPUs which this
Josh Boyerbb61ccc2013-11-05 09:37:29 -0500834 kernel will support. If CPUMASK_OFFSTACK is enabled, the maximum
835 supported value is 4096, otherwise the maximum value is 512. The
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100836 minimum value which makes sense is 2.
837
838 This is purely to save memory - each supported CPU adds
839 approximately eight kilobytes to the kernel image.
840
841config SCHED_SMT
842 bool "SMT (Hyperthreading) scheduler support"
Hiroshi Shimamotob089c122008-02-27 13:16:30 -0800843 depends on X86_HT
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100844 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100845 SMT scheduler support improves the CPU scheduler's decision making
846 when dealing with Intel Pentium 4 chips with HyperThreading at a
847 cost of slightly increased overhead in some places. If unsure say
848 N here.
849
850config SCHED_MC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100851 def_bool y
852 prompt "Multi-core scheduler support"
Hiroshi Shimamotob089c122008-02-27 13:16:30 -0800853 depends on X86_HT
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100854 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100855 Multi-core scheduler support improves the CPU scheduler's decision
856 making when dealing with multi-core CPU chips at a cost of slightly
857 increased overhead in some places. If unsure say N here.
858
859source "kernel/Kconfig.preempt"
860
861config X86_UP_APIC
862 bool "Local APIC support on uniprocessors"
Thomas Petazzoni0dbc6072013-10-03 11:59:14 +0200863 depends on X86_32 && !SMP && !X86_32_NON_STANDARD && !PCI_MSI
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100864 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100865 A local APIC (Advanced Programmable Interrupt Controller) is an
866 integrated interrupt controller in the CPU. If you have a single-CPU
867 system which has a processor with a local APIC, you can say Y here to
868 enable and use it. If you say Y here even though your machine doesn't
869 have a local APIC, then the kernel will still run with no slowdown at
870 all. The local APIC supports CPU-generated self-interrupts (timer,
871 performance counters), and the NMI watchdog which detects hard
872 lockups.
873
874config X86_UP_IOAPIC
875 bool "IO-APIC support on uniprocessors"
876 depends on X86_UP_APIC
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100877 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100878 An IO-APIC (I/O Advanced Programmable Interrupt Controller) is an
879 SMP-capable replacement for PC-style interrupt controllers. Most
880 SMP systems and many recent uniprocessor systems have one.
881
882 If you have a single-CPU system with an IO-APIC, you can say Y here
883 to use it. If you say Y here even though your machine doesn't have
884 an IO-APIC, then the kernel will still run with no slowdown at all.
885
886config X86_LOCAL_APIC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100887 def_bool y
Thomas Petazzoni0dbc6072013-10-03 11:59:14 +0200888 depends on X86_64 || SMP || X86_32_NON_STANDARD || X86_UP_APIC || PCI_MSI
Jiang Liu74afab72014-10-27 16:12:00 +0800889 select GENERIC_IRQ_LEGACY_ALLOC_HWIRQ
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100890
891config X86_IO_APIC
Jiang Liu2f600022014-10-27 16:12:06 +0800892 def_bool X86_64 || SMP || X86_32_NON_STANDARD || X86_UP_IOAPIC
893 depends on X86_LOCAL_APIC
Jiang Liud7f3d472014-06-09 16:19:52 +0800894 select IRQ_DOMAIN
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100895
Stefan Assmann41b9eb22008-07-15 13:48:55 +0200896config X86_REROUTE_FOR_BROKEN_BOOT_IRQS
897 bool "Reroute for broken boot IRQs"
Stefan Assmann41b9eb22008-07-15 13:48:55 +0200898 depends on X86_IO_APIC
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100899 ---help---
Stefan Assmann41b9eb22008-07-15 13:48:55 +0200900 This option enables a workaround that fixes a source of
901 spurious interrupts. This is recommended when threaded
902 interrupt handling is used on systems where the generation of
903 superfluous "boot interrupts" cannot be disabled.
904
905 Some chipsets generate a legacy INTx "boot IRQ" when the IRQ
906 entry in the chipset's IO-APIC is masked (as, e.g. the RT
907 kernel does during interrupt handling). On chipsets where this
908 boot IRQ generation cannot be disabled, this workaround keeps
909 the original IRQ line masked so that only the equivalent "boot
910 IRQ" is delivered to the CPUs. The workaround also tells the
911 kernel to set up the IRQ handler on the boot IRQ line. In this
912 way only one interrupt is delivered to the kernel. Otherwise
913 the spurious second interrupt may cause the kernel to bring
914 down (vital) interrupt lines.
915
916 Only affects "broken" chipsets. Interrupt sharing may be
917 increased on these systems.
918
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100919config X86_MCE
Andi Kleenbab9bc62009-07-09 00:31:38 +0200920 bool "Machine Check / overheating reporting"
Borislav Petkove57dbaf2011-09-13 15:23:21 +0200921 default y
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100922 ---help---
Andi Kleenbab9bc62009-07-09 00:31:38 +0200923 Machine Check support allows the processor to notify the
924 kernel if it detects a problem (e.g. overheating, data corruption).
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100925 The action the kernel takes depends on the severity of the problem,
Andi Kleenbab9bc62009-07-09 00:31:38 +0200926 ranging from warning messages to halting the machine.
Andi Kleen4efc0672009-04-28 19:07:31 +0200927
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100928config X86_MCE_INTEL
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100929 def_bool y
930 prompt "Intel MCE features"
Andi Kleenc1ebf832009-07-09 00:31:41 +0200931 depends on X86_MCE && X86_LOCAL_APIC
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100932 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100933 Additional support for intel specific MCE features such as
934 the thermal monitor.
935
936config X86_MCE_AMD
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100937 def_bool y
938 prompt "AMD MCE features"
Andi Kleenc1ebf832009-07-09 00:31:41 +0200939 depends on X86_MCE && X86_LOCAL_APIC
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100940 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100941 Additional support for AMD specific MCE features such as
942 the DRAM Error Threshold.
943
Andi Kleen4efc0672009-04-28 19:07:31 +0200944config X86_ANCIENT_MCE
Jan Beulich6fc108a2010-04-21 15:23:44 +0100945 bool "Support for old Pentium 5 / WinChip machine checks"
Andi Kleenc31d9632009-07-09 00:31:37 +0200946 depends on X86_32 && X86_MCE
Hidetoshi Setocd13adcc2009-05-27 16:57:31 +0900947 ---help---
948 Include support for machine check handling on old Pentium 5 or WinChip
Masanari Iida5065a702013-11-30 21:38:43 +0900949 systems. These typically need to be enabled explicitly on the command
Hidetoshi Setocd13adcc2009-05-27 16:57:31 +0900950 line.
Andi Kleen4efc0672009-04-28 19:07:31 +0200951
Andi Kleenb2762682009-02-12 13:49:31 +0100952config X86_MCE_THRESHOLD
953 depends on X86_MCE_AMD || X86_MCE_INTEL
Jan Beulich6fc108a2010-04-21 15:23:44 +0100954 def_bool y
Andi Kleenb2762682009-02-12 13:49:31 +0100955
Andi Kleenea149b32009-04-29 19:31:00 +0200956config X86_MCE_INJECT
Andi Kleenc1ebf832009-07-09 00:31:41 +0200957 depends on X86_MCE
Andi Kleenea149b32009-04-29 19:31:00 +0200958 tristate "Machine check injector support"
959 ---help---
960 Provide support for injecting machine checks for testing purposes.
961 If you don't know what a machine check is and you don't do kernel
962 QA it is safe to say n.
963
Andi Kleen4efc0672009-04-28 19:07:31 +0200964config X86_THERMAL_VECTOR
965 def_bool y
Andi Kleen5bb38ad2009-07-09 00:31:39 +0200966 depends on X86_MCE_INTEL
Andi Kleen4efc0672009-04-28 19:07:31 +0200967
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100968config VM86
David Rientjes6a108a12011-01-20 14:44:16 -0800969 bool "Enable VM86 support" if EXPERT
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100970 default y
971 depends on X86_32
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100972 ---help---
H. Peter Anvin34273f42014-05-04 10:36:22 -0700973 This option is required by programs like DOSEMU to run
974 16-bit real mode legacy code on x86 processors. It also may
975 be needed by software like XFree86 to initialize some video
976 cards via BIOS. Disabling this option saves about 6K.
977
978config X86_16BIT
979 bool "Enable support for 16-bit segments" if EXPERT
980 default y
981 ---help---
982 This option is required by programs like Wine to run 16-bit
983 protected mode legacy code on x86 processors. Disabling
984 this option saves about 300 bytes on i386, or around 6K text
985 plus 16K runtime memory on x86-64,
986
987config X86_ESPFIX32
988 def_bool y
989 depends on X86_16BIT && X86_32
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100990
H. Peter Anvin197725d2014-05-04 10:00:49 -0700991config X86_ESPFIX64
992 def_bool y
H. Peter Anvin34273f42014-05-04 10:36:22 -0700993 depends on X86_16BIT && X86_64
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100994
Andy Lutomirski1ad83c82014-10-29 14:33:47 -0700995config X86_VSYSCALL_EMULATION
996 bool "Enable vsyscall emulation" if EXPERT
997 default y
998 depends on X86_64
999 ---help---
1000 This enables emulation of the legacy vsyscall page. Disabling
1001 it is roughly equivalent to booting with vsyscall=none, except
1002 that it will also disable the helpful warning if a program
1003 tries to use a vsyscall. With this option set to N, offending
1004 programs will just segfault, citing addresses of the form
1005 0xffffffffff600?00.
1006
1007 This option is required by many programs built before 2013, and
1008 care should be used even with newer programs if set to N.
1009
1010 Disabling this option saves about 7K of kernel size and
1011 possibly 4K of additional runtime pagetable memory.
1012
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001013config TOSHIBA
1014 tristate "Toshiba Laptop support"
1015 depends on X86_32
1016 ---help---
1017 This adds a driver to safely access the System Management Mode of
1018 the CPU on Toshiba portables with a genuine Toshiba BIOS. It does
1019 not work on models with a Phoenix BIOS. The System Management Mode
1020 is used to set the BIOS and power saving options on Toshiba portables.
1021
1022 For information on utilities to make use of this driver see the
1023 Toshiba Linux utilities web site at:
1024 <http://www.buzzard.org.uk/toshiba/>.
1025
1026 Say Y if you intend to run this kernel on a Toshiba portable.
1027 Say N otherwise.
1028
1029config I8K
1030 tristate "Dell laptop support"
Jean Delvare949a9d72011-05-25 20:43:33 +02001031 select HWMON
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001032 ---help---
1033 This adds a driver to safely access the System Management Mode
1034 of the CPU on the Dell Inspiron 8000. The System Management Mode
1035 is used to read cpu temperature and cooling fan status and to
1036 control the fans on the I8K portables.
1037
1038 This driver has been tested only on the Inspiron 8000 but it may
1039 also work with other Dell laptops. You can force loading on other
1040 models by passing the parameter `force=1' to the module. Use at
1041 your own risk.
1042
1043 For information on utilities to make use of this driver see the
1044 I8K Linux utilities web site at:
1045 <http://people.debian.org/~dz/i8k/>
1046
1047 Say Y if you intend to run this kernel on a Dell Inspiron 8000.
1048 Say N otherwise.
1049
1050config X86_REBOOTFIXUPS
Jan Beulich9ba16082008-10-15 22:01:38 -07001051 bool "Enable X86 board specific fixups for reboot"
1052 depends on X86_32
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001053 ---help---
1054 This enables chipset and/or board specific fixups to be done
1055 in order to get reboot to work correctly. This is only needed on
1056 some combinations of hardware and BIOS. The symptom, for which
1057 this config is intended, is when reboot ends with a stalled/hung
1058 system.
1059
1060 Currently, the only fixup is for the Geode machines using
Florian Fainelli5e3a77e2008-01-30 13:33:36 +01001061 CS5530A and CS5536 chipsets and the RDC R-321x SoC.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001062
1063 Say Y if you want to enable the fixup. Currently, it's safe to
1064 enable this option even if you don't need it.
1065 Say N otherwise.
1066
1067config MICROCODE
Borislav Petkove43f6e62012-08-01 19:17:01 +02001068 tristate "CPU microcode loading support"
Borislav Petkov80030e32013-10-13 18:36:29 +02001069 depends on CPU_SUP_AMD || CPU_SUP_INTEL
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001070 select FW_LOADER
1071 ---help---
Borislav Petkove43f6e62012-08-01 19:17:01 +02001072
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001073 If you say Y here, you will be able to update the microcode on
Peter Oruba80cc9f12008-07-28 18:44:22 +02001074 certain Intel and AMD processors. The Intel support is for the
Borislav Petkove43f6e62012-08-01 19:17:01 +02001075 IA32 family, e.g. Pentium Pro, Pentium II, Pentium III, Pentium 4,
1076 Xeon etc. The AMD support is for families 0x10 and later. You will
1077 obviously need the actual microcode binary data itself which is not
1078 shipped with the Linux kernel.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001079
Peter Oruba8d86f392008-07-28 18:44:21 +02001080 This option selects the general module only, you need to select
1081 at least one vendor specific module as well.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001082
Borislav Petkove43f6e62012-08-01 19:17:01 +02001083 To compile this driver as a module, choose M here: the module
1084 will be called microcode.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001085
Peter Oruba8d86f392008-07-28 18:44:21 +02001086config MICROCODE_INTEL
Borislav Petkove43f6e62012-08-01 19:17:01 +02001087 bool "Intel microcode loading support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001088 depends on MICROCODE
1089 default MICROCODE
1090 select FW_LOADER
1091 ---help---
1092 This options enables microcode patch loading support for Intel
1093 processors.
Peter Oruba8d86f392008-07-28 18:44:21 +02001094
Alanb8989db2014-01-20 18:01:56 +00001095 For the current Intel microcode data package go to
1096 <https://downloadcenter.intel.com> and search for
1097 'Linux Processor Microcode Data File'.
Peter Oruba8d86f392008-07-28 18:44:21 +02001098
Peter Oruba80cc9f12008-07-28 18:44:22 +02001099config MICROCODE_AMD
Borislav Petkove43f6e62012-08-01 19:17:01 +02001100 bool "AMD microcode loading support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001101 depends on MICROCODE
1102 select FW_LOADER
1103 ---help---
1104 If you select this option, microcode patch loading support for AMD
1105 processors will be enabled.
Peter Oruba80cc9f12008-07-28 18:44:22 +02001106
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001107config MICROCODE_OLD_INTERFACE
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001108 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001109 depends on MICROCODE
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001110
Fenghua Yuda76f642012-12-20 23:44:32 -08001111config MICROCODE_INTEL_EARLY
Jacob Shin757885e2013-05-30 14:09:19 -05001112 def_bool n
1113
1114config MICROCODE_AMD_EARLY
1115 def_bool n
1116
1117config MICROCODE_EARLY
Fenghua Yuda76f642012-12-20 23:44:32 -08001118 bool "Early load microcode"
Jacob Shin6b3389a2013-05-31 01:53:24 -05001119 depends on MICROCODE=y && BLK_DEV_INITRD
Jacob Shin757885e2013-05-30 14:09:19 -05001120 select MICROCODE_INTEL_EARLY if MICROCODE_INTEL
1121 select MICROCODE_AMD_EARLY if MICROCODE_AMD
Fenghua Yuda76f642012-12-20 23:44:32 -08001122 default y
1123 help
1124 This option provides functionality to read additional microcode data
1125 at the beginning of initrd image. The data tells kernel to load
1126 microcode to CPU's as early as possible. No functional change if no
1127 microcode data is glued to the initrd, therefore it's safe to say Y.
1128
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001129config X86_MSR
1130 tristate "/dev/cpu/*/msr - Model-specific register support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001131 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001132 This device gives privileged processes access to the x86
1133 Model-Specific Registers (MSRs). It is a character device with
1134 major 202 and minors 0 to 31 for /dev/cpu/0/msr to /dev/cpu/31/msr.
1135 MSR accesses are directed to a specific CPU on multi-processor
1136 systems.
1137
1138config X86_CPUID
1139 tristate "/dev/cpu/*/cpuid - CPU information support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001140 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001141 This device gives processes access to the x86 CPUID instruction to
1142 be executed on a specific processor. It is a character device
1143 with major 203 and minors 0 to 31 for /dev/cpu/0/cpuid to
1144 /dev/cpu/31/cpuid.
1145
1146choice
1147 prompt "High Memory Support"
Jan Beulich6fc108a2010-04-21 15:23:44 +01001148 default HIGHMEM4G
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001149 depends on X86_32
1150
1151config NOHIGHMEM
1152 bool "off"
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001153 ---help---
1154 Linux can use up to 64 Gigabytes of physical memory on x86 systems.
1155 However, the address space of 32-bit x86 processors is only 4
1156 Gigabytes large. That means that, if you have a large amount of
1157 physical memory, not all of it can be "permanently mapped" by the
1158 kernel. The physical memory that's not permanently mapped is called
1159 "high memory".
1160
1161 If you are compiling a kernel which will never run on a machine with
1162 more than 1 Gigabyte total physical RAM, answer "off" here (default
1163 choice and suitable for most users). This will result in a "3GB/1GB"
1164 split: 3GB are mapped so that each process sees a 3GB virtual memory
1165 space and the remaining part of the 4GB virtual memory space is used
1166 by the kernel to permanently map as much physical memory as
1167 possible.
1168
1169 If the machine has between 1 and 4 Gigabytes physical RAM, then
1170 answer "4GB" here.
1171
1172 If more than 4 Gigabytes is used then answer "64GB" here. This
1173 selection turns Intel PAE (Physical Address Extension) mode on.
1174 PAE implements 3-level paging on IA32 processors. PAE is fully
1175 supported by Linux, PAE mode is implemented on all recent Intel
1176 processors (Pentium Pro and better). NOTE: If you say "64GB" here,
1177 then the kernel will not boot on CPUs that don't support PAE!
1178
1179 The actual amount of total physical memory will either be
1180 auto detected or can be forced by using a kernel command line option
1181 such as "mem=256M". (Try "man bootparam" or see the documentation of
1182 your boot loader (lilo or loadlin) about how to pass options to the
1183 kernel at boot time.)
1184
1185 If unsure, say "off".
1186
1187config HIGHMEM4G
1188 bool "4GB"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001189 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001190 Select this if you have a 32-bit processor and between 1 and 4
1191 gigabytes of physical RAM.
1192
1193config HIGHMEM64G
1194 bool "64GB"
H. Peter Anvineb068e72012-11-28 11:50:23 -08001195 depends on !M486
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001196 select X86_PAE
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001197 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001198 Select this if you have a 32-bit processor and more than 4
1199 gigabytes of physical RAM.
1200
1201endchoice
1202
1203choice
David Rientjes6a108a12011-01-20 14:44:16 -08001204 prompt "Memory split" if EXPERT
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001205 default VMSPLIT_3G
1206 depends on X86_32
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001207 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001208 Select the desired split between kernel and user memory.
1209
1210 If the address range available to the kernel is less than the
1211 physical memory installed, the remaining memory will be available
1212 as "high memory". Accessing high memory is a little more costly
1213 than low memory, as it needs to be mapped into the kernel first.
1214 Note that increasing the kernel address space limits the range
1215 available to user programs, making the address space there
1216 tighter. Selecting anything other than the default 3G/1G split
1217 will also likely make your kernel incompatible with binary-only
1218 kernel modules.
1219
1220 If you are not absolutely sure what you are doing, leave this
1221 option alone!
1222
1223 config VMSPLIT_3G
1224 bool "3G/1G user/kernel split"
1225 config VMSPLIT_3G_OPT
1226 depends on !X86_PAE
1227 bool "3G/1G user/kernel split (for full 1G low memory)"
1228 config VMSPLIT_2G
1229 bool "2G/2G user/kernel split"
1230 config VMSPLIT_2G_OPT
1231 depends on !X86_PAE
1232 bool "2G/2G user/kernel split (for full 2G low memory)"
1233 config VMSPLIT_1G
1234 bool "1G/3G user/kernel split"
1235endchoice
1236
1237config PAGE_OFFSET
1238 hex
1239 default 0xB0000000 if VMSPLIT_3G_OPT
1240 default 0x80000000 if VMSPLIT_2G
1241 default 0x78000000 if VMSPLIT_2G_OPT
1242 default 0x40000000 if VMSPLIT_1G
1243 default 0xC0000000
1244 depends on X86_32
1245
1246config HIGHMEM
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001247 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001248 depends on X86_32 && (HIGHMEM64G || HIGHMEM4G)
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001249
1250config X86_PAE
Jan Beulich9ba16082008-10-15 22:01:38 -07001251 bool "PAE (Physical Address Extension) Support"
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001252 depends on X86_32 && !HIGHMEM4G
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001253 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001254 PAE is required for NX support, and furthermore enables
1255 larger swapspace support for non-overcommit purposes. It
1256 has the cost of more pagetable lookup overhead, and also
1257 consumes more pagetable space per process.
1258
Jeremy Fitzhardinge600715d2008-09-11 01:31:45 -07001259config ARCH_PHYS_ADDR_T_64BIT
Jan Beulich3120e252012-09-10 12:41:45 +01001260 def_bool y
1261 depends on X86_64 || X86_PAE
Jeremy Fitzhardinge600715d2008-09-11 01:31:45 -07001262
FUJITA Tomonori66f2b062010-10-20 15:55:35 -07001263config ARCH_DMA_ADDR_T_64BIT
Jan Beulich3120e252012-09-10 12:41:45 +01001264 def_bool y
1265 depends on X86_64 || HIGHMEM64G
FUJITA Tomonori66f2b062010-10-20 15:55:35 -07001266
Nick Piggin9e899812008-10-22 12:33:16 +02001267config DIRECT_GBPAGES
David Rientjes6a108a12011-01-20 14:44:16 -08001268 bool "Enable 1GB pages for kernel pagetables" if EXPERT
Nick Piggin9e899812008-10-22 12:33:16 +02001269 default y
1270 depends on X86_64
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001271 ---help---
Nick Piggin9e899812008-10-22 12:33:16 +02001272 Allow the kernel linear mapping to use 1GB pages on CPUs that
1273 support it. This can improve the kernel's performance a tiny bit by
1274 reducing TLB pressure. If in doubt, say "Y".
1275
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001276# Common NUMA Features
1277config NUMA
KOSAKI Motohirofd51b2d2008-11-05 02:27:19 +09001278 bool "Numa Memory Allocation and Scheduler Support"
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001279 depends on SMP
H. Peter Anvinb5660ba2014-02-25 12:14:06 -08001280 depends on X86_64 || (X86_32 && HIGHMEM64G && X86_BIGSMP)
1281 default y if X86_BIGSMP
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001282 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001283 Enable NUMA (Non Uniform Memory Access) support.
KOSAKI Motohirofd51b2d2008-11-05 02:27:19 +09001284
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001285 The kernel will try to allocate memory used by a CPU on the
1286 local memory controller of the CPU and add some more
1287 NUMA awareness to the kernel.
1288
Ingo Molnarc280ea52008-11-08 13:29:45 +01001289 For 64-bit this is recommended if the system is Intel Core i7
KOSAKI Motohirofd51b2d2008-11-05 02:27:19 +09001290 (or later), AMD Opteron, or EM64T NUMA.
1291
H. Peter Anvinb5660ba2014-02-25 12:14:06 -08001292 For 32-bit this is only needed if you boot a 32-bit
David Rientjes7cf6c942014-02-11 18:11:13 -08001293 kernel on a 64-bit NUMA platform.
KOSAKI Motohirofd51b2d2008-11-05 02:27:19 +09001294
1295 Otherwise, you should say N.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001296
Hans Rosenfeldeec1d4f2010-10-29 17:14:30 +02001297config AMD_NUMA
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001298 def_bool y
1299 prompt "Old style AMD Opteron NUMA detection"
Tejun Heo5da0ef92011-07-11 10:34:32 +02001300 depends on X86_64 && NUMA && PCI
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001301 ---help---
Hans Rosenfeldeec1d4f2010-10-29 17:14:30 +02001302 Enable AMD NUMA node topology detection. You should say Y here if
1303 you have a multi processor AMD system. This uses an old method to
1304 read the NUMA configuration directly from the builtin Northbridge
1305 of Opteron. It is recommended to use X86_64_ACPI_NUMA instead,
1306 which also takes priority if both are compiled in.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001307
1308config X86_64_ACPI_NUMA
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001309 def_bool y
1310 prompt "ACPI NUMA detection"
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001311 depends on X86_64 && NUMA && ACPI && PCI
1312 select ACPI_NUMA
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001313 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001314 Enable ACPI SRAT based node topology detection.
1315
Suresh Siddha6ec6e0d2008-03-25 10:14:35 -07001316# Some NUMA nodes have memory ranges that span
1317# other nodes. Even though a pfn is valid and
1318# between a node's start and end pfns, it may not
1319# reside on that node. See memmap_init_zone()
1320# for details.
1321config NODES_SPAN_OTHER_NODES
1322 def_bool y
1323 depends on X86_64_ACPI_NUMA
1324
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001325config NUMA_EMU
1326 bool "NUMA emulation"
Tejun Heo1b7e03e2011-05-02 17:24:48 +02001327 depends on NUMA
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001328 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001329 Enable NUMA emulation. A flat machine will be split
1330 into virtual nodes when booted with "numa=fake=N", where N is the
1331 number of nodes. This is only useful for debugging.
1332
1333config NODES_SHIFT
Linus Torvaldsd25e26b2008-08-25 14:15:38 -07001334 int "Maximum NUMA Nodes (as a power of 2)" if !MAXSMP
David Rientjes51591e32010-03-25 15:39:27 -07001335 range 1 10
1336 default "10" if MAXSMP
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001337 default "6" if X86_64
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001338 default "3"
1339 depends on NEED_MULTIPLE_NODES
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001340 ---help---
Mike Travis1184dc22008-05-12 21:21:12 +02001341 Specify the maximum number of NUMA Nodes available on the target
Matt LaPlante692105b2009-01-26 11:12:25 +01001342 system. Increases memory reserved to accommodate various tables.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001343
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001344config ARCH_HAVE_MEMORY_PRESENT
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001345 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001346 depends on X86_32 && DISCONTIGMEM
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001347
1348config NEED_NODE_MEMMAP_SIZE
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001349 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001350 depends on X86_32 && (DISCONTIGMEM || SPARSEMEM)
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001351
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001352config ARCH_FLATMEM_ENABLE
1353 def_bool y
Tejun Heo3b166512011-04-01 11:15:12 +02001354 depends on X86_32 && !NUMA
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001355
1356config ARCH_DISCONTIGMEM_ENABLE
1357 def_bool y
Christoph Lameterb2632952008-01-30 13:30:47 +01001358 depends on NUMA && X86_32
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001359
1360config ARCH_DISCONTIGMEM_DEFAULT
1361 def_bool y
Christoph Lameterb2632952008-01-30 13:30:47 +01001362 depends on NUMA && X86_32
1363
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001364config ARCH_SPARSEMEM_ENABLE
1365 def_bool y
Kees Cook6ea30382012-10-02 11:16:47 -07001366 depends on X86_64 || NUMA || X86_32 || X86_32_NON_STANDARD
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001367 select SPARSEMEM_STATIC if X86_32
1368 select SPARSEMEM_VMEMMAP_ENABLE if X86_64
1369
Tejun Heo3b166512011-04-01 11:15:12 +02001370config ARCH_SPARSEMEM_DEFAULT
1371 def_bool y
1372 depends on X86_64
1373
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001374config ARCH_SELECT_MEMORY_MODEL
1375 def_bool y
Christoph Lameterb2632952008-01-30 13:30:47 +01001376 depends on ARCH_SPARSEMEM_ENABLE
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001377
1378config ARCH_MEMORY_PROBE
Toshi Kania0842b72013-07-19 11:47:48 -06001379 bool "Enable sysfs memory/probe interface"
Jan Beulich3120e252012-09-10 12:41:45 +01001380 depends on X86_64 && MEMORY_HOTPLUG
Toshi Kania0842b72013-07-19 11:47:48 -06001381 help
1382 This option enables a sysfs memory/probe interface for testing.
1383 See Documentation/memory-hotplug.txt for more information.
1384 If you are unsure how to answer this question, answer N.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001385
Tejun Heo3b166512011-04-01 11:15:12 +02001386config ARCH_PROC_KCORE_TEXT
1387 def_bool y
1388 depends on X86_64 && PROC_KCORE
1389
Avi Kivitya29815a2010-01-10 16:28:09 +02001390config ILLEGAL_POINTER_VALUE
1391 hex
1392 default 0 if X86_32
1393 default 0xdead000000000000 if X86_64
1394
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001395source "mm/Kconfig"
1396
1397config HIGHPTE
1398 bool "Allocate 3rd-level pagetables from highmem"
Jan Beulich6fc108a2010-04-21 15:23:44 +01001399 depends on HIGHMEM
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001400 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001401 The VM uses one page table entry for each page of physical memory.
1402 For systems with a lot of RAM, this can be wasteful of precious
1403 low memory. Setting this option will put user-space page table
1404 entries in high memory.
1405
Jeremy Fitzhardinge9f077872008-09-07 01:51:34 -07001406config X86_CHECK_BIOS_CORRUPTION
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001407 bool "Check for low memory corruption"
1408 ---help---
1409 Periodically check for memory corruption in low memory, which
1410 is suspected to be caused by BIOS. Even when enabled in the
1411 configuration, it is disabled at runtime. Enable it by
1412 setting "memory_corruption_check=1" on the kernel command
1413 line. By default it scans the low 64k of memory every 60
1414 seconds; see the memory_corruption_check_size and
1415 memory_corruption_check_period parameters in
1416 Documentation/kernel-parameters.txt to adjust this.
Jeremy Fitzhardinge9f077872008-09-07 01:51:34 -07001417
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001418 When enabled with the default parameters, this option has
1419 almost no overhead, as it reserves a relatively small amount
1420 of memory and scans it infrequently. It both detects corruption
1421 and prevents it from affecting the running system.
Jeremy Fitzhardinge9f077872008-09-07 01:51:34 -07001422
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001423 It is, however, intended as a diagnostic tool; if repeatable
1424 BIOS-originated corruption always affects the same memory,
1425 you can use memmap= to prevent the kernel from using that
1426 memory.
Jeremy Fitzhardinge9f077872008-09-07 01:51:34 -07001427
Jeremy Fitzhardingec885df52008-09-07 02:37:32 -07001428config X86_BOOTPARAM_MEMORY_CORRUPTION_CHECK
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001429 bool "Set the default setting of memory_corruption_check"
Jeremy Fitzhardingec885df52008-09-07 02:37:32 -07001430 depends on X86_CHECK_BIOS_CORRUPTION
1431 default y
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001432 ---help---
1433 Set whether the default state of memory_corruption_check is
1434 on or off.
Jeremy Fitzhardingec885df52008-09-07 02:37:32 -07001435
H. Peter Anvin9ea77bd2010-08-25 16:38:20 -07001436config X86_RESERVE_LOW
H. Peter Anvind0cd7422010-08-24 17:32:04 -07001437 int "Amount of low memory, in kilobytes, to reserve for the BIOS"
1438 default 64
1439 range 4 640
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001440 ---help---
H. Peter Anvind0cd7422010-08-24 17:32:04 -07001441 Specify the amount of low memory to reserve for the BIOS.
Ingo Molnarfc381512008-09-16 10:07:34 +02001442
H. Peter Anvind0cd7422010-08-24 17:32:04 -07001443 The first page contains BIOS data structures that the kernel
1444 must not use, so that page must always be reserved.
Ingo Molnarfc381512008-09-16 10:07:34 +02001445
H. Peter Anvind0cd7422010-08-24 17:32:04 -07001446 By default we reserve the first 64K of physical RAM, as a
1447 number of BIOSes are known to corrupt that memory range
1448 during events such as suspend/resume or monitor cable
1449 insertion, so it must not be used by the kernel.
Ingo Molnarfc381512008-09-16 10:07:34 +02001450
H. Peter Anvind0cd7422010-08-24 17:32:04 -07001451 You can set this to 4 if you are absolutely sure that you
1452 trust the BIOS to get all its memory reservations and usages
1453 right. If you know your BIOS have problems beyond the
1454 default 64K area, you can set this to 640 to avoid using the
1455 entire low memory range.
1456
1457 If you have doubts about the BIOS (e.g. suspend/resume does
1458 not work or there's kernel crashes after certain hardware
1459 hotplug events) then you might want to enable
1460 X86_CHECK_BIOS_CORRUPTION=y to allow the kernel to check
1461 typical corruption patterns.
1462
1463 Leave this to the default value of 64 if you are unsure.
Ingo Molnarfc381512008-09-16 10:07:34 +02001464
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001465config MATH_EMULATION
1466 bool
1467 prompt "Math emulation" if X86_32
1468 ---help---
1469 Linux can emulate a math coprocessor (used for floating point
1470 operations) if you don't have one. 486DX and Pentium processors have
1471 a math coprocessor built in, 486SX and 386 do not, unless you added
1472 a 487DX or 387, respectively. (The messages during boot time can
1473 give you some hints here ["man dmesg"].) Everyone needs either a
1474 coprocessor or this emulation.
1475
1476 If you don't have a math coprocessor, you need to say Y here; if you
1477 say Y here even though you have a coprocessor, the coprocessor will
1478 be used nevertheless. (This behavior can be changed with the kernel
1479 command line option "no387", which comes handy if your coprocessor
1480 is broken. Try "man bootparam" or see the documentation of your boot
1481 loader (lilo or loadlin) about how to pass options to the kernel at
1482 boot time.) This means that it is a good idea to say Y here if you
1483 intend to use this kernel on different machines.
1484
1485 More information about the internals of the Linux math coprocessor
1486 emulation can be found in <file:arch/x86/math-emu/README>.
1487
1488 If you are not sure, say Y; apart from resulting in a 66 KB bigger
1489 kernel, it won't hurt.
1490
1491config MTRR
Jan Beulich6fc108a2010-04-21 15:23:44 +01001492 def_bool y
David Rientjes6a108a12011-01-20 14:44:16 -08001493 prompt "MTRR (Memory Type Range Register) support" if EXPERT
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001494 ---help---
1495 On Intel P6 family processors (Pentium Pro, Pentium II and later)
1496 the Memory Type Range Registers (MTRRs) may be used to control
1497 processor access to memory ranges. This is most useful if you have
1498 a video (VGA) card on a PCI or AGP bus. Enabling write-combining
1499 allows bus write transfers to be combined into a larger transfer
1500 before bursting over the PCI/AGP bus. This can increase performance
1501 of image write operations 2.5 times or more. Saying Y here creates a
1502 /proc/mtrr file which may be used to manipulate your processor's
1503 MTRRs. Typically the X server should use this.
1504
1505 This code has a reasonably generic interface so that similar
1506 control registers on other processors can be easily supported
1507 as well:
1508
1509 The Cyrix 6x86, 6x86MX and M II processors have Address Range
1510 Registers (ARRs) which provide a similar functionality to MTRRs. For
1511 these, the ARRs are used to emulate the MTRRs.
1512 The AMD K6-2 (stepping 8 and above) and K6-3 processors have two
1513 MTRRs. The Centaur C6 (WinChip) has 8 MCRs, allowing
1514 write-combining. All of these processors are supported by this code
1515 and it makes sense to say Y here if you have one of them.
1516
1517 Saying Y here also fixes a problem with buggy SMP BIOSes which only
1518 set the MTRRs for the boot CPU and not for the secondary CPUs. This
1519 can lead to all sorts of problems, so it's good to say Y here.
1520
1521 You can safely say Y even if your machine doesn't have MTRRs, you'll
1522 just add about 9 KB to your kernel.
1523
Randy Dunlap7225e752008-07-26 17:54:22 -07001524 See <file:Documentation/x86/mtrr.txt> for more information.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001525
Yinghai Lu95ffa242008-04-29 03:52:33 -07001526config MTRR_SANITIZER
Yinghai Lu2ffb3502008-09-30 16:29:40 -07001527 def_bool y
Yinghai Lu95ffa242008-04-29 03:52:33 -07001528 prompt "MTRR cleanup support"
1529 depends on MTRR
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001530 ---help---
Thomas Gleixneraba37282008-07-15 14:48:48 +02001531 Convert MTRR layout from continuous to discrete, so X drivers can
1532 add writeback entries.
Yinghai Lu95ffa242008-04-29 03:52:33 -07001533
Thomas Gleixneraba37282008-07-15 14:48:48 +02001534 Can be disabled with disable_mtrr_cleanup on the kernel command line.
Matt LaPlante692105b2009-01-26 11:12:25 +01001535 The largest mtrr entry size for a continuous block can be set with
Thomas Gleixneraba37282008-07-15 14:48:48 +02001536 mtrr_chunk_size.
Yinghai Lu95ffa242008-04-29 03:52:33 -07001537
Yinghai Lu2ffb3502008-09-30 16:29:40 -07001538 If unsure, say Y.
Yinghai Lu95ffa242008-04-29 03:52:33 -07001539
1540config MTRR_SANITIZER_ENABLE_DEFAULT
Yinghai Luf5098d62008-04-29 20:25:58 -07001541 int "MTRR cleanup enable value (0-1)"
1542 range 0 1
1543 default "0"
Yinghai Lu95ffa242008-04-29 03:52:33 -07001544 depends on MTRR_SANITIZER
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001545 ---help---
Yinghai Luf5098d62008-04-29 20:25:58 -07001546 Enable mtrr cleanup default value
Yinghai Lu95ffa242008-04-29 03:52:33 -07001547
Yinghai Lu12031a62008-05-02 02:40:22 -07001548config MTRR_SANITIZER_SPARE_REG_NR_DEFAULT
1549 int "MTRR cleanup spare reg num (0-7)"
1550 range 0 7
1551 default "1"
1552 depends on MTRR_SANITIZER
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001553 ---help---
Yinghai Lu12031a62008-05-02 02:40:22 -07001554 mtrr cleanup spare entries default, it can be changed via
Thomas Gleixneraba37282008-07-15 14:48:48 +02001555 mtrr_spare_reg_nr=N on the kernel command line.
Yinghai Lu12031a62008-05-02 02:40:22 -07001556
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001557config X86_PAT
Jan Beulich6fc108a2010-04-21 15:23:44 +01001558 def_bool y
David Rientjes6a108a12011-01-20 14:44:16 -08001559 prompt "x86 PAT support" if EXPERT
Ingo Molnar2a8a2712008-04-26 10:26:52 +02001560 depends on MTRR
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001561 ---help---
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001562 Use PAT attributes to setup page level cache control.
Venki Pallipadi042b78e2008-03-24 14:22:35 -07001563
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001564 PATs are the modern equivalents of MTRRs and are much more
1565 flexible than MTRRs.
1566
1567 Say N here if you see bootup problems (boot crash, boot hang,
Venki Pallipadi042b78e2008-03-24 14:22:35 -07001568 spontaneous reboots) or a non-working video driver.
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001569
1570 If unsure, say Y.
1571
Venkatesh Pallipadi46cf98c2009-07-10 09:57:37 -07001572config ARCH_USES_PG_UNCACHED
1573 def_bool y
1574 depends on X86_PAT
1575
H. Peter Anvin628c6242011-07-31 13:59:29 -07001576config ARCH_RANDOM
1577 def_bool y
1578 prompt "x86 architectural random number generator" if EXPERT
1579 ---help---
1580 Enable the x86 architectural RDRAND instruction
1581 (Intel Bull Mountain technology) to generate random numbers.
1582 If supported, this is a high bandwidth, cryptographically
1583 secure hardware random number generator.
1584
H. Peter Anvin51ae4a22012-09-21 12:43:10 -07001585config X86_SMAP
1586 def_bool y
1587 prompt "Supervisor Mode Access Prevention" if EXPERT
1588 ---help---
1589 Supervisor Mode Access Prevention (SMAP) is a security
1590 feature in newer Intel processors. There is a small
1591 performance cost if this enabled and turned on; there is
1592 also a small increase in the kernel size if this is enabled.
1593
1594 If unsure, say Y.
1595
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001596config EFI
Jan Beulich9ba16082008-10-15 22:01:38 -07001597 bool "EFI runtime service support"
Huang, Ying5b836832008-01-30 13:31:19 +01001598 depends on ACPI
Sergey Vlasovf6ce5002013-04-16 18:31:08 +04001599 select UCS2_STRING
Ard Biesheuvel022ee6c2014-06-26 12:09:05 +02001600 select EFI_RUNTIME_WRAPPERS
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001601 ---help---
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001602 This enables the kernel to use EFI runtime services that are
1603 available (such as the EFI variable services).
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001604
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001605 This option is only useful on systems that have EFI firmware.
1606 In addition, you should use the latest ELILO loader available
1607 at <http://elilo.sourceforge.net> in order to take advantage
1608 of EFI runtime services. However, even with this option, the
1609 resultant kernel should continue to boot on existing non-EFI
1610 platforms.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001611
Matt Fleming291f3632011-12-12 21:27:52 +00001612config EFI_STUB
1613 bool "EFI stub support"
Matt Flemingb16d8c22014-08-05 00:12:19 +01001614 depends on EFI && !X86_USE_3DNOW
Matt Fleming7b2a5832014-07-11 08:45:25 +01001615 select RELOCATABLE
Matt Fleming291f3632011-12-12 21:27:52 +00001616 ---help---
1617 This kernel feature allows a bzImage to be loaded directly
1618 by EFI firmware without the use of a bootloader.
1619
Roy Franz4172fe22013-09-22 15:45:25 -07001620 See Documentation/efi-stub.txt for more information.
Matt Fleming0c759662012-03-16 12:03:13 +00001621
Matt Fleming7d453ee2014-01-10 18:52:06 +00001622config EFI_MIXED
1623 bool "EFI mixed-mode support"
1624 depends on EFI_STUB && X86_64
1625 ---help---
1626 Enabling this feature allows a 64-bit kernel to be booted
1627 on a 32-bit firmware, provided that your CPU supports 64-bit
1628 mode.
1629
1630 Note that it is not possible to boot a mixed-mode enabled
1631 kernel via the EFI boot stub - a bootloader that supports
1632 the EFI handover protocol must be used.
1633
1634 If unsure, say N.
1635
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001636config SECCOMP
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001637 def_bool y
1638 prompt "Enable seccomp to safely compute untrusted bytecode"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001639 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001640 This kernel feature is useful for number crunching applications
1641 that may need to compute untrusted bytecode during their
1642 execution. By using pipes or other transports made available to
1643 the process as file descriptors supporting the read/write
1644 syscalls, it's possible to isolate those applications in
1645 their own address space using seccomp. Once seccomp is
Alexey Dobriyan9c0bbee2008-09-09 11:01:31 +04001646 enabled via prctl(PR_SET_SECCOMP), it cannot be disabled
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001647 and the task is only allowed to execute a few safe syscalls
1648 defined by each seccomp mode.
1649
1650 If unsure, say Y. Only embedded should say N here.
1651
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001652source kernel/Kconfig.hz
1653
1654config KEXEC
1655 bool "kexec system call"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001656 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001657 kexec is a system call that implements the ability to shutdown your
1658 current kernel, and to start another kernel. It is like a reboot
1659 but it is independent of the system firmware. And like a reboot
1660 you can start any kernel with it, not just Linux.
1661
1662 The name comes from the similarity to the exec system call.
1663
1664 It is an ongoing process to be certain the hardware in a machine
1665 is properly shutdown, so do not be surprised if this code does not
Geert Uytterhoevenbf220692013-08-20 21:38:03 +02001666 initially work for you. As of this writing the exact hardware
1667 interface is strongly in flux, so no good recommendation can be
1668 made.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001669
Vivek Goyal74ca3172014-08-29 15:18:46 -07001670config KEXEC_FILE
1671 bool "kexec file based system call"
1672 select BUILD_BIN2C
1673 depends on KEXEC
1674 depends on X86_64
1675 depends on CRYPTO=y
1676 depends on CRYPTO_SHA256=y
1677 ---help---
1678 This is new version of kexec system call. This system call is
1679 file based and takes file descriptors as system call argument
1680 for kernel and initramfs as opposed to list of segments as
1681 accepted by previous system call.
1682
Vivek Goyal8e7d8382014-08-08 14:26:13 -07001683config KEXEC_VERIFY_SIG
1684 bool "Verify kernel signature during kexec_file_load() syscall"
Vivek Goyal74ca3172014-08-29 15:18:46 -07001685 depends on KEXEC_FILE
Vivek Goyal8e7d8382014-08-08 14:26:13 -07001686 ---help---
1687 This option makes kernel signature verification mandatory for
1688 kexec_file_load() syscall. If kernel is signature can not be
1689 verified, kexec_file_load() will fail.
1690
1691 This option enforces signature verification at generic level.
1692 One needs to enable signature verification for type of kernel
1693 image being loaded to make sure it works. For example, enable
1694 bzImage signature verification option to be able to load and
1695 verify signatures of bzImage. Otherwise kernel loading will fail.
1696
1697config KEXEC_BZIMAGE_VERIFY_SIG
1698 bool "Enable bzImage signature verification support"
1699 depends on KEXEC_VERIFY_SIG
1700 depends on SIGNED_PE_FILE_VERIFICATION
1701 select SYSTEM_TRUSTED_KEYRING
1702 ---help---
1703 Enable bzImage signature verification support.
1704
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001705config CRASH_DUMP
Pavel Machek04b69442008-08-14 17:16:50 +02001706 bool "kernel crash dumps"
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001707 depends on X86_64 || (X86_32 && HIGHMEM)
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001708 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001709 Generate crash dump after being started by kexec.
1710 This should be normally only set in special crash dump kernels
1711 which are loaded in the main kernel with kexec-tools into
1712 a specially reserved region and then later executed after
1713 a crash by kdump/kexec. The crash dump kernel must be compiled
1714 to a memory address not used by the main kernel or BIOS using
1715 PHYSICAL_START, or it must be built as a relocatable image
1716 (CONFIG_RELOCATABLE=y).
1717 For more details see Documentation/kdump/kdump.txt
1718
Huang Ying3ab83522008-07-25 19:45:07 -07001719config KEXEC_JUMP
Kees Cook6ea30382012-10-02 11:16:47 -07001720 bool "kexec jump"
Huang Yingfee7b0d2009-03-10 10:57:16 +08001721 depends on KEXEC && HIBERNATION
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001722 ---help---
Huang Ying89081d12008-07-25 19:45:10 -07001723 Jump between original kernel and kexeced kernel and invoke
1724 code in physical address mode via KEXEC
Huang Ying3ab83522008-07-25 19:45:07 -07001725
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001726config PHYSICAL_START
David Rientjes6a108a12011-01-20 14:44:16 -08001727 hex "Physical address where the kernel is loaded" if (EXPERT || CRASH_DUMP)
H. Peter Anvinceefccc2009-05-11 16:12:16 -07001728 default "0x1000000"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001729 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001730 This gives the physical address where the kernel is loaded.
1731
1732 If kernel is a not relocatable (CONFIG_RELOCATABLE=n) then
1733 bzImage will decompress itself to above physical address and
1734 run from there. Otherwise, bzImage will run from the address where
1735 it has been loaded by the boot loader and will ignore above physical
1736 address.
1737
1738 In normal kdump cases one does not have to set/change this option
1739 as now bzImage can be compiled as a completely relocatable image
1740 (CONFIG_RELOCATABLE=y) and be used to load and run from a different
1741 address. This option is mainly useful for the folks who don't want
1742 to use a bzImage for capturing the crash dump and want to use a
1743 vmlinux instead. vmlinux is not relocatable hence a kernel needs
1744 to be specifically compiled to run from a specific memory area
1745 (normally a reserved region) and this option comes handy.
1746
H. Peter Anvinceefccc2009-05-11 16:12:16 -07001747 So if you are using bzImage for capturing the crash dump,
1748 leave the value here unchanged to 0x1000000 and set
1749 CONFIG_RELOCATABLE=y. Otherwise if you plan to use vmlinux
1750 for capturing the crash dump change this value to start of
1751 the reserved region. In other words, it can be set based on
1752 the "X" value as specified in the "crashkernel=YM@XM"
1753 command line boot parameter passed to the panic-ed
1754 kernel. Please take a look at Documentation/kdump/kdump.txt
1755 for more details about crash dumps.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001756
1757 Usage of bzImage for capturing the crash dump is recommended as
1758 one does not have to build two kernels. Same kernel can be used
1759 as production kernel and capture kernel. Above option should have
1760 gone away after relocatable bzImage support is introduced. But it
1761 is present because there are users out there who continue to use
1762 vmlinux for dump capture. This option should go away down the
1763 line.
1764
1765 Don't change this unless you know what you are doing.
1766
1767config RELOCATABLE
H. Peter Anvin26717802009-05-07 14:19:34 -07001768 bool "Build a relocatable kernel"
1769 default y
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001770 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001771 This builds a kernel image that retains relocation information
1772 so it can be loaded someplace besides the default 1MB.
1773 The relocations tend to make the kernel binary about 10% larger,
1774 but are discarded at runtime.
1775
1776 One use is for the kexec on panic case where the recovery kernel
1777 must live at a different physical address than the primary
1778 kernel.
1779
1780 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
1781 it has been loaded at and the compile time physical address
Kees Cook8ab38202013-10-10 17:18:14 -07001782 (CONFIG_PHYSICAL_START) is used as the minimum location.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001783
Kees Cook8ab38202013-10-10 17:18:14 -07001784config RANDOMIZE_BASE
1785 bool "Randomize the address of the kernel image"
1786 depends on RELOCATABLE
Kees Cook8ab38202013-10-10 17:18:14 -07001787 default n
1788 ---help---
1789 Randomizes the physical and virtual address at which the
1790 kernel image is decompressed, as a security feature that
1791 deters exploit attempts relying on knowledge of the location
1792 of kernel internals.
1793
Kees Cooka653f352013-11-11 14:28:39 -08001794 Entropy is generated using the RDRAND instruction if it is
1795 supported. If RDTSC is supported, it is used as well. If
1796 neither RDRAND nor RDTSC are supported, then randomness is
1797 read from the i8254 timer.
Kees Cook8ab38202013-10-10 17:18:14 -07001798
1799 The kernel will be offset by up to RANDOMIZE_BASE_MAX_OFFSET,
Kees Cooka653f352013-11-11 14:28:39 -08001800 and aligned according to PHYSICAL_ALIGN. Since the kernel is
1801 built using 2GiB addressing, and PHYSICAL_ALGIN must be at a
1802 minimum of 2MiB, only 10 bits of entropy is theoretically
1803 possible. At best, due to page table layouts, 64-bit can use
1804 9 bits of entropy and 32-bit uses 8 bits.
Kees Cook8ab38202013-10-10 17:18:14 -07001805
Kees Cookda2b6fb2013-12-10 12:27:45 -08001806 If unsure, say N.
1807
Kees Cook8ab38202013-10-10 17:18:14 -07001808config RANDOMIZE_BASE_MAX_OFFSET
Kees Cookda2b6fb2013-12-10 12:27:45 -08001809 hex "Maximum kASLR offset allowed" if EXPERT
Kees Cook8ab38202013-10-10 17:18:14 -07001810 depends on RANDOMIZE_BASE
Kees Cook6145cfe2013-10-10 17:18:18 -07001811 range 0x0 0x20000000 if X86_32
1812 default "0x20000000" if X86_32
1813 range 0x0 0x40000000 if X86_64
1814 default "0x40000000" if X86_64
Kees Cook8ab38202013-10-10 17:18:14 -07001815 ---help---
Kees Cookda2b6fb2013-12-10 12:27:45 -08001816 The lesser of RANDOMIZE_BASE_MAX_OFFSET and available physical
1817 memory is used to determine the maximal offset in bytes that will
1818 be applied to the kernel when kernel Address Space Layout
1819 Randomization (kASLR) is active. This must be a multiple of
1820 PHYSICAL_ALIGN.
Kees Cook6145cfe2013-10-10 17:18:18 -07001821
Kees Cookda2b6fb2013-12-10 12:27:45 -08001822 On 32-bit this is limited to 512MiB by page table layouts. The
1823 default is 512MiB.
Kees Cook6145cfe2013-10-10 17:18:18 -07001824
Kees Cookda2b6fb2013-12-10 12:27:45 -08001825 On 64-bit this is limited by how the kernel fixmap page table is
1826 positioned, so this cannot be larger than 1GiB currently. Without
1827 RANDOMIZE_BASE, there is a 512MiB to 1.5GiB split between kernel
1828 and modules. When RANDOMIZE_BASE_MAX_OFFSET is above 512MiB, the
1829 modules area will shrink to compensate, up to the current maximum
1830 1GiB to 1GiB split. The default is 1GiB.
1831
1832 If unsure, leave at the default value.
Kees Cook8ab38202013-10-10 17:18:14 -07001833
1834# Relocation on x86 needs some additional build support
H. Peter Anvin845adf72009-05-05 21:20:51 -07001835config X86_NEED_RELOCS
1836 def_bool y
Kees Cook8ab38202013-10-10 17:18:14 -07001837 depends on RANDOMIZE_BASE || (X86_32 && RELOCATABLE)
H. Peter Anvin845adf72009-05-05 21:20:51 -07001838
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001839config PHYSICAL_ALIGN
Kees Cooka0215062013-07-08 09:15:17 -07001840 hex "Alignment value to which kernel should be aligned"
Kees Cook8ab38202013-10-10 17:18:14 -07001841 default "0x200000"
Kees Cooka0215062013-07-08 09:15:17 -07001842 range 0x2000 0x1000000 if X86_32
1843 range 0x200000 0x1000000 if X86_64
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001844 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001845 This value puts the alignment restrictions on physical address
1846 where kernel is loaded and run from. Kernel is compiled for an
1847 address which meets above alignment restriction.
1848
1849 If bootloader loads the kernel at a non-aligned address and
1850 CONFIG_RELOCATABLE is set, kernel will move itself to nearest
1851 address aligned to above value and run from there.
1852
1853 If bootloader loads the kernel at a non-aligned address and
1854 CONFIG_RELOCATABLE is not set, kernel will ignore the run time
1855 load address and decompress itself to the address it has been
1856 compiled for and run from there. The address for which kernel is
1857 compiled already meets above alignment restrictions. Hence the
1858 end result is that kernel runs from a physical address meeting
1859 above alignment restrictions.
1860
Kees Cooka0215062013-07-08 09:15:17 -07001861 On 32-bit this value must be a multiple of 0x2000. On 64-bit
1862 this value must be a multiple of 0x200000.
1863
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001864 Don't change this unless you know what you are doing.
1865
1866config HOTPLUG_CPU
Dimitri Sivanich7c13e6a2008-08-11 10:46:46 -05001867 bool "Support for hot-pluggable CPUs"
Stephen Rothwell40b31362013-05-21 13:49:35 +10001868 depends on SMP
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001869 ---help---
Dimitri Sivanich7c13e6a2008-08-11 10:46:46 -05001870 Say Y here to allow turning CPUs off and on. CPUs can be
1871 controlled through /sys/devices/system/cpu.
1872 ( Note: power management support will enable this option
1873 automatically on SMP systems. )
1874 Say N if you want to disable CPU hotplug.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001875
Fenghua Yu80aa1df2012-11-13 11:32:39 -08001876config BOOTPARAM_HOTPLUG_CPU0
1877 bool "Set default setting of cpu0_hotpluggable"
1878 default n
Kees Cook2c922cd2013-01-22 13:01:19 -08001879 depends on HOTPLUG_CPU
Fenghua Yu80aa1df2012-11-13 11:32:39 -08001880 ---help---
1881 Set whether default state of cpu0_hotpluggable is on or off.
1882
1883 Say Y here to enable CPU0 hotplug by default. If this switch
1884 is turned on, there is no need to give cpu0_hotplug kernel
1885 parameter and the CPU0 hotplug feature is enabled by default.
1886
1887 Please note: there are two known CPU0 dependencies if you want
1888 to enable the CPU0 hotplug feature either by this switch or by
1889 cpu0_hotplug kernel parameter.
1890
1891 First, resume from hibernate or suspend always starts from CPU0.
1892 So hibernate and suspend are prevented if CPU0 is offline.
1893
1894 Second dependency is PIC interrupts always go to CPU0. CPU0 can not
1895 offline if any interrupt can not migrate out of CPU0. There may
1896 be other CPU0 dependencies.
1897
1898 Please make sure the dependencies are under your control before
1899 you enable this feature.
1900
1901 Say N if you don't want to enable CPU0 hotplug feature by default.
1902 You still can enable the CPU0 hotplug feature at boot by kernel
1903 parameter cpu0_hotplug.
1904
Fenghua Yua71c8bc2012-11-13 11:32:51 -08001905config DEBUG_HOTPLUG_CPU0
1906 def_bool n
1907 prompt "Debug CPU0 hotplug"
Kees Cook2c922cd2013-01-22 13:01:19 -08001908 depends on HOTPLUG_CPU
Fenghua Yua71c8bc2012-11-13 11:32:51 -08001909 ---help---
1910 Enabling this option offlines CPU0 (if CPU0 can be offlined) as
1911 soon as possible and boots up userspace with CPU0 offlined. User
1912 can online CPU0 back after boot time.
1913
1914 To debug CPU0 hotplug, you need to enable CPU0 offline/online
1915 feature by either turning on CONFIG_BOOTPARAM_HOTPLUG_CPU0 during
1916 compilation or giving cpu0_hotplug kernel parameter at boot.
1917
1918 If unsure, say N.
1919
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001920config COMPAT_VDSO
Andy Lutomirskib0b49f22014-03-13 16:01:26 -07001921 def_bool n
1922 prompt "Disable the 32-bit vDSO (needed for glibc 2.3.3)"
Roland McGrathaf65d642008-01-30 13:30:43 +01001923 depends on X86_32 || IA32_EMULATION
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001924 ---help---
Andy Lutomirskib0b49f22014-03-13 16:01:26 -07001925 Certain buggy versions of glibc will crash if they are
1926 presented with a 32-bit vDSO that is not mapped at the address
1927 indicated in its segment table.
Randy Dunlape84446d2009-11-10 15:46:52 -08001928
Andy Lutomirskib0b49f22014-03-13 16:01:26 -07001929 The bug was introduced by f866314b89d56845f55e6f365e18b31ec978ec3a
1930 and fixed by 3b3ddb4f7db98ec9e912ccdf54d35df4aa30e04a and
1931 49ad572a70b8aeb91e57483a11dd1b77e31c4468. Glibc 2.3.3 is
1932 the only released version with the bug, but OpenSUSE 9
1933 contains a buggy "glibc 2.3.2".
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001934
Andy Lutomirskib0b49f22014-03-13 16:01:26 -07001935 The symptom of the bug is that everything crashes on startup, saying:
1936 dl_main: Assertion `(void *) ph->p_vaddr == _rtld_local._dl_sysinfo_dso' failed!
1937
1938 Saying Y here changes the default value of the vdso32 boot
1939 option from 1 to 0, which turns off the 32-bit vDSO entirely.
1940 This works around the glibc bug but hurts performance.
1941
1942 If unsure, say N: if you are compiling your own kernel, you
1943 are unlikely to be using a buggy version of glibc.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001944
Tim Bird516cbf32008-08-12 12:52:36 -07001945config CMDLINE_BOOL
1946 bool "Built-in kernel command line"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001947 ---help---
Tim Bird516cbf32008-08-12 12:52:36 -07001948 Allow for specifying boot arguments to the kernel at
1949 build time. On some systems (e.g. embedded ones), it is
1950 necessary or convenient to provide some or all of the
1951 kernel boot arguments with the kernel itself (that is,
1952 to not rely on the boot loader to provide them.)
1953
1954 To compile command line arguments into the kernel,
1955 set this option to 'Y', then fill in the
1956 the boot arguments in CONFIG_CMDLINE.
1957
1958 Systems with fully functional boot loaders (i.e. non-embedded)
1959 should leave this option set to 'N'.
1960
1961config CMDLINE
1962 string "Built-in kernel command string"
1963 depends on CMDLINE_BOOL
1964 default ""
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001965 ---help---
Tim Bird516cbf32008-08-12 12:52:36 -07001966 Enter arguments here that should be compiled into the kernel
1967 image and used at boot time. If the boot loader provides a
1968 command line at boot time, it is appended to this string to
1969 form the full kernel command line, when the system boots.
1970
1971 However, you can use the CONFIG_CMDLINE_OVERRIDE option to
1972 change this behavior.
1973
1974 In most cases, the command line (whether built-in or provided
1975 by the boot loader) should specify the device for the root
1976 file system.
1977
1978config CMDLINE_OVERRIDE
1979 bool "Built-in command line overrides boot loader arguments"
Tim Bird516cbf32008-08-12 12:52:36 -07001980 depends on CMDLINE_BOOL
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001981 ---help---
Tim Bird516cbf32008-08-12 12:52:36 -07001982 Set this option to 'Y' to have the kernel ignore the boot loader
1983 command line, and use ONLY the built-in command line.
1984
1985 This is used to work around broken boot loaders. This should
1986 be set to 'N' under normal conditions.
1987
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001988endmenu
1989
1990config ARCH_ENABLE_MEMORY_HOTPLUG
1991 def_bool y
1992 depends on X86_64 || (X86_32 && HIGHMEM)
1993
Gary Hade35551052008-10-31 10:52:03 -07001994config ARCH_ENABLE_MEMORY_HOTREMOVE
1995 def_bool y
1996 depends on MEMORY_HOTPLUG
1997
Lee Schermerhorne534c7c2010-05-26 14:44:58 -07001998config USE_PERCPU_NUMA_NODE_ID
Tejun Heo645a7912011-01-23 14:37:40 +01001999 def_bool y
Lee Schermerhorne534c7c2010-05-26 14:44:58 -07002000 depends on NUMA
2001
Kirill A. Shutemov94918462013-11-14 14:31:10 -08002002config ARCH_ENABLE_SPLIT_PMD_PTLOCK
2003 def_bool y
2004 depends on X86_64 || X86_PAE
2005
Naoya Horiguchic177c812014-06-04 16:05:35 -07002006config ARCH_ENABLE_HUGEPAGE_MIGRATION
2007 def_bool y
2008 depends on X86_64 && HUGETLB_PAGE && MIGRATION
2009
Bjorn Helgaasda85f862008-11-05 13:37:27 -06002010menu "Power management and ACPI options"
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002011
2012config ARCH_HIBERNATION_HEADER
Harvey Harrison3c2362e2008-01-30 13:31:03 +01002013 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002014 depends on X86_64 && HIBERNATION
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002015
2016source "kernel/power/Kconfig"
2017
2018source "drivers/acpi/Kconfig"
2019
Feng Tangefafc8b2009-08-14 15:23:29 -04002020source "drivers/sfi/Kconfig"
2021
Andi Kleena6b68072008-01-30 13:32:49 +01002022config X86_APM_BOOT
Jan Beulich6fc108a2010-04-21 15:23:44 +01002023 def_bool y
Paul Bolle282e5aa2011-11-17 11:41:31 +01002024 depends on APM
Andi Kleena6b68072008-01-30 13:32:49 +01002025
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002026menuconfig APM
2027 tristate "APM (Advanced Power Management) BIOS support"
Ingo Molnarefefa6f2008-07-10 16:09:50 +02002028 depends on X86_32 && PM_SLEEP
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002029 ---help---
2030 APM is a BIOS specification for saving power using several different
2031 techniques. This is mostly useful for battery powered laptops with
2032 APM compliant BIOSes. If you say Y here, the system time will be
2033 reset after a RESUME operation, the /proc/apm device will provide
2034 battery status information, and user-space programs will receive
2035 notification of APM "events" (e.g. battery status change).
2036
2037 If you select "Y" here, you can disable actual use of the APM
2038 BIOS by passing the "apm=off" option to the kernel at boot time.
2039
2040 Note that the APM support is almost completely disabled for
2041 machines with more than one CPU.
2042
2043 In order to use APM, you will need supporting software. For location
Michael Witten2dc98fd2011-07-08 21:11:16 +00002044 and more information, read <file:Documentation/power/apm-acpi.txt>
2045 and the Battery Powered Linux mini-HOWTO, available from
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002046 <http://www.tldp.org/docs.html#howto>.
2047
2048 This driver does not spin down disk drives (see the hdparm(8)
2049 manpage ("man 8 hdparm") for that), and it doesn't turn off
2050 VESA-compliant "green" monitors.
2051
2052 This driver does not support the TI 4000M TravelMate and the ACER
2053 486/DX4/75 because they don't have compliant BIOSes. Many "green"
2054 desktop machines also don't have compliant BIOSes, and this driver
2055 may cause those machines to panic during the boot phase.
2056
2057 Generally, if you don't have a battery in your machine, there isn't
2058 much point in using this driver and you should say N. If you get
2059 random kernel OOPSes or reboots that don't seem to be related to
2060 anything, try disabling/enabling this option (or disabling/enabling
2061 APM in your BIOS).
2062
2063 Some other things you should try when experiencing seemingly random,
2064 "weird" problems:
2065
2066 1) make sure that you have enough swap space and that it is
2067 enabled.
2068 2) pass the "no-hlt" option to the kernel
2069 3) switch on floating point emulation in the kernel and pass
2070 the "no387" option to the kernel
2071 4) pass the "floppy=nodma" option to the kernel
2072 5) pass the "mem=4M" option to the kernel (thereby disabling
2073 all but the first 4 MB of RAM)
2074 6) make sure that the CPU is not over clocked.
2075 7) read the sig11 FAQ at <http://www.bitwizard.nl/sig11/>
2076 8) disable the cache from your BIOS settings
2077 9) install a fan for the video card or exchange video RAM
2078 10) install a better fan for the CPU
2079 11) exchange RAM chips
2080 12) exchange the motherboard.
2081
2082 To compile this driver as a module, choose M here: the
2083 module will be called apm.
2084
2085if APM
2086
2087config APM_IGNORE_USER_SUSPEND
2088 bool "Ignore USER SUSPEND"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002089 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002090 This option will ignore USER SUSPEND requests. On machines with a
2091 compliant APM BIOS, you want to say N. However, on the NEC Versa M
2092 series notebooks, it is necessary to say Y because of a BIOS bug.
2093
2094config APM_DO_ENABLE
2095 bool "Enable PM at boot time"
2096 ---help---
2097 Enable APM features at boot time. From page 36 of the APM BIOS
2098 specification: "When disabled, the APM BIOS does not automatically
2099 power manage devices, enter the Standby State, enter the Suspend
2100 State, or take power saving steps in response to CPU Idle calls."
2101 This driver will make CPU Idle calls when Linux is idle (unless this
2102 feature is turned off -- see "Do CPU IDLE calls", below). This
2103 should always save battery power, but more complicated APM features
2104 will be dependent on your BIOS implementation. You may need to turn
2105 this option off if your computer hangs at boot time when using APM
2106 support, or if it beeps continuously instead of suspending. Turn
2107 this off if you have a NEC UltraLite Versa 33/C or a Toshiba
2108 T400CDT. This is off by default since most machines do fine without
2109 this feature.
2110
2111config APM_CPU_IDLE
Len Browndd8af072013-02-09 21:10:04 -05002112 depends on CPU_IDLE
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002113 bool "Make CPU Idle calls when idle"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002114 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002115 Enable calls to APM CPU Idle/CPU Busy inside the kernel's idle loop.
2116 On some machines, this can activate improved power savings, such as
2117 a slowed CPU clock rate, when the machine is idle. These idle calls
2118 are made after the idle loop has run for some length of time (e.g.,
2119 333 mS). On some machines, this will cause a hang at boot time or
2120 whenever the CPU becomes idle. (On machines with more than one CPU,
2121 this option does nothing.)
2122
2123config APM_DISPLAY_BLANK
2124 bool "Enable console blanking using APM"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002125 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002126 Enable console blanking using the APM. Some laptops can use this to
2127 turn off the LCD backlight when the screen blanker of the Linux
2128 virtual console blanks the screen. Note that this is only used by
2129 the virtual console screen blanker, and won't turn off the backlight
2130 when using the X Window system. This also doesn't have anything to
2131 do with your VESA-compliant power-saving monitor. Further, this
2132 option doesn't work for all laptops -- it might not turn off your
2133 backlight at all, or it might print a lot of errors to the console,
2134 especially if you are using gpm.
2135
2136config APM_ALLOW_INTS
2137 bool "Allow interrupts during APM BIOS calls"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002138 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002139 Normally we disable external interrupts while we are making calls to
2140 the APM BIOS as a measure to lessen the effects of a badly behaving
2141 BIOS implementation. The BIOS should reenable interrupts if it
2142 needs to. Unfortunately, some BIOSes do not -- especially those in
2143 many of the newer IBM Thinkpads. If you experience hangs when you
2144 suspend, try setting this to Y. Otherwise, say N.
2145
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002146endif # APM
2147
Dave Jonesbb0a56e2011-05-19 18:51:07 -04002148source "drivers/cpufreq/Kconfig"
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002149
2150source "drivers/cpuidle/Kconfig"
2151
Andy Henroid27471fd2008-10-09 11:45:22 -07002152source "drivers/idle/Kconfig"
2153
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002154endmenu
2155
2156
2157menu "Bus options (PCI etc.)"
2158
2159config PCI
Ingo Molnar1ac97012008-05-19 14:10:14 +02002160 bool "PCI support"
Adrian Bunk1c858082008-01-30 13:32:32 +01002161 default y
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002162 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002163 Find out whether you have a PCI motherboard. PCI is the name of a
2164 bus system, i.e. the way the CPU talks to the other stuff inside
2165 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
2166 VESA. If you have PCI, say Y, otherwise N.
2167
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002168choice
2169 prompt "PCI access mode"
Ingo Molnarefefa6f2008-07-10 16:09:50 +02002170 depends on X86_32 && PCI
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002171 default PCI_GOANY
2172 ---help---
2173 On PCI systems, the BIOS can be used to detect the PCI devices and
2174 determine their configuration. However, some old PCI motherboards
2175 have BIOS bugs and may crash if this is done. Also, some embedded
2176 PCI-based systems don't have any BIOS at all. Linux can also try to
2177 detect the PCI hardware directly without using the BIOS.
2178
2179 With this option, you can specify how Linux should detect the
2180 PCI devices. If you choose "BIOS", the BIOS will be used,
2181 if you choose "Direct", the BIOS won't be used, and if you
2182 choose "MMConfig", then PCI Express MMCONFIG will be used.
2183 If you choose "Any", the kernel will try MMCONFIG, then the
2184 direct access method and falls back to the BIOS if that doesn't
2185 work. If unsure, go with the default, which is "Any".
2186
2187config PCI_GOBIOS
2188 bool "BIOS"
2189
2190config PCI_GOMMCONFIG
2191 bool "MMConfig"
2192
2193config PCI_GODIRECT
2194 bool "Direct"
2195
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07002196config PCI_GOOLPC
Daniel Drake76fb6572010-09-23 17:28:04 +01002197 bool "OLPC XO-1"
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07002198 depends on OLPC
2199
Andres Salomon2bdd1b02008-06-05 14:14:41 -07002200config PCI_GOANY
2201 bool "Any"
2202
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002203endchoice
2204
2205config PCI_BIOS
Harvey Harrison3c2362e2008-01-30 13:31:03 +01002206 def_bool y
Ingo Molnarefefa6f2008-07-10 16:09:50 +02002207 depends on X86_32 && PCI && (PCI_GOBIOS || PCI_GOANY)
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002208
2209# x86-64 doesn't support PCI BIOS access from long mode so always go direct.
2210config PCI_DIRECT
Harvey Harrison3c2362e2008-01-30 13:31:03 +01002211 def_bool y
Shaohua Li0aba4962011-05-27 14:59:39 +08002212 depends on PCI && (X86_64 || (PCI_GODIRECT || PCI_GOANY || PCI_GOOLPC || PCI_GOMMCONFIG))
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002213
2214config PCI_MMCONFIG
Harvey Harrison3c2362e2008-01-30 13:31:03 +01002215 def_bool y
Feng Tang5f0db7a2009-08-14 15:37:50 -04002216 depends on X86_32 && PCI && (ACPI || SFI) && (PCI_GOMMCONFIG || PCI_GOANY)
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002217
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07002218config PCI_OLPC
Andres Salomon2bdd1b02008-06-05 14:14:41 -07002219 def_bool y
2220 depends on PCI && OLPC && (PCI_GOOLPC || PCI_GOANY)
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07002221
Alex Nixonb5401a92010-03-18 16:31:34 -04002222config PCI_XEN
2223 def_bool y
2224 depends on PCI && XEN
2225 select SWIOTLB_XEN
2226
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002227config PCI_DOMAINS
Harvey Harrison3c2362e2008-01-30 13:31:03 +01002228 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002229 depends on PCI
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002230
2231config PCI_MMCONFIG
2232 bool "Support mmconfig PCI config space access"
2233 depends on X86_64 && PCI && ACPI
2234
Ira W. Snyder3f6ea842010-04-01 11:43:30 -07002235config PCI_CNB20LE_QUIRK
David Rientjes6a108a12011-01-20 14:44:16 -08002236 bool "Read CNB20LE Host Bridge Windows" if EXPERT
Kees Cook6ea30382012-10-02 11:16:47 -07002237 depends on PCI
Ira W. Snyder3f6ea842010-04-01 11:43:30 -07002238 help
2239 Read the PCI windows out of the CNB20LE host bridge. This allows
2240 PCI hotplug to work on systems with the CNB20LE chipset which do
2241 not have ACPI.
2242
Bjorn Helgaas64a5fed2011-01-06 10:12:30 -07002243 There's no public spec for this chipset, and this functionality
2244 is known to be incomplete.
2245
2246 You should say N unless you know you need this.
2247
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002248source "drivers/pci/pcie/Kconfig"
2249
2250source "drivers/pci/Kconfig"
2251
David Rientjes1c00f012011-03-22 16:34:59 -07002252# x86_64 have no ISA slots, but can have ISA-style DMA.
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002253config ISA_DMA_API
David Rientjes1c00f012011-03-22 16:34:59 -07002254 bool "ISA-style DMA support" if (X86_64 && EXPERT)
2255 default y
2256 help
2257 Enables ISA-style DMA support for devices requiring such controllers.
2258 If unsure, say Y.
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002259
2260if X86_32
2261
2262config ISA
2263 bool "ISA support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002264 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002265 Find out whether you have ISA slots on your motherboard. ISA is the
2266 name of a bus system, i.e. the way the CPU talks to the other stuff
2267 inside your box. Other bus systems are PCI, EISA, MicroChannel
2268 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
2269 newer boards don't support it. If you have ISA, say Y, otherwise N.
2270
2271config EISA
2272 bool "EISA support"
2273 depends on ISA
2274 ---help---
2275 The Extended Industry Standard Architecture (EISA) bus was
2276 developed as an open alternative to the IBM MicroChannel bus.
2277
2278 The EISA bus provided some of the features of the IBM MicroChannel
2279 bus while maintaining backward compatibility with cards made for
2280 the older ISA bus. The EISA bus saw limited use between 1988 and
2281 1995 when it was made obsolete by the PCI bus.
2282
2283 Say Y here if you are building a kernel for an EISA-based machine.
2284
2285 Otherwise, say N.
2286
2287source "drivers/eisa/Kconfig"
2288
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002289config SCx200
2290 tristate "NatSemi SCx200 support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002291 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002292 This provides basic support for National Semiconductor's
2293 (now AMD's) Geode processors. The driver probes for the
2294 PCI-IDs of several on-chip devices, so its a good dependency
2295 for other scx200_* drivers.
2296
2297 If compiled as a module, the driver is named scx200.
2298
2299config SCx200HR_TIMER
2300 tristate "NatSemi SCx200 27MHz High-Resolution Timer Support"
John Stultz592913e2010-07-13 17:56:20 -07002301 depends on SCx200
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002302 default y
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002303 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002304 This driver provides a clocksource built upon the on-chip
2305 27MHz high-resolution timer. Its also a workaround for
2306 NSC Geode SC-1100's buggy TSC, which loses time when the
2307 processor goes idle (as is done by the scheduler). The
2308 other workaround is idle=poll boot option.
2309
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07002310config OLPC
2311 bool "One Laptop Per Child support"
Thomas Gleixner54008972011-02-23 09:50:15 +01002312 depends on !X86_PAE
Andres Salomon3c554942009-12-14 18:00:36 -08002313 select GPIOLIB
Thomas Gleixnerdc3119e72011-02-23 10:08:31 +01002314 select OF
Daniel Drake45bb1672011-03-13 15:10:17 +00002315 select OF_PROMTREE
Grant Likelyb4e51852011-12-16 15:50:17 -07002316 select IRQ_DOMAIN
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002317 ---help---
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07002318 Add support for detecting the unique features of the OLPC
2319 XO hardware.
2320
Daniel Drakea3128582011-06-25 17:34:10 +01002321config OLPC_XO1_PM
2322 bool "OLPC XO-1 Power Management"
Daniel Drake97c4cb72011-06-25 17:34:11 +01002323 depends on OLPC && MFD_CS5535 && PM_SLEEP
Daniel Drakea3128582011-06-25 17:34:10 +01002324 select MFD_CORE
Daniel Drakebf1ebf02010-10-10 10:40:32 +01002325 ---help---
Daniel Drake97c4cb72011-06-25 17:34:11 +01002326 Add support for poweroff and suspend of the OLPC XO-1 laptop.
Daniel Drakebf1ebf02010-10-10 10:40:32 +01002327
Daniel Drakecfee9592011-06-25 17:34:17 +01002328config OLPC_XO1_RTC
2329 bool "OLPC XO-1 Real Time Clock"
2330 depends on OLPC_XO1_PM && RTC_DRV_CMOS
2331 ---help---
2332 Add support for the XO-1 real time clock, which can be used as a
2333 programmable wakeup source.
2334
Daniel Drake7feda8e2011-06-25 17:34:12 +01002335config OLPC_XO1_SCI
2336 bool "OLPC XO-1 SCI extras"
Daniel Draked8d01a62011-07-24 18:33:21 +01002337 depends on OLPC && OLPC_XO1_PM
Randy Dunlaped8e47f2012-12-18 12:22:17 -08002338 depends on INPUT=y
Daniel Draked8d01a62011-07-24 18:33:21 +01002339 select POWER_SUPPLY
Daniel Drake7feda8e2011-06-25 17:34:12 +01002340 select GPIO_CS5535
2341 select MFD_CORE
2342 ---help---
2343 Add support for SCI-based features of the OLPC XO-1 laptop:
Daniel Drake7bc74b32011-06-25 17:34:14 +01002344 - EC-driven system wakeups
Daniel Drake7feda8e2011-06-25 17:34:12 +01002345 - Power button
Daniel Drake7bc74b32011-06-25 17:34:14 +01002346 - Ebook switch
Daniel Drake2cf2bae2011-06-25 17:34:15 +01002347 - Lid switch
Daniel Drakee1040ac2011-06-25 17:34:16 +01002348 - AC adapter status updates
2349 - Battery status updates
Daniel Drake7feda8e2011-06-25 17:34:12 +01002350
Daniel Drakea0f30f52011-06-25 17:34:18 +01002351config OLPC_XO15_SCI
2352 bool "OLPC XO-1.5 SCI extras"
Daniel Draked8d01a62011-07-24 18:33:21 +01002353 depends on OLPC && ACPI
2354 select POWER_SUPPLY
Daniel Drakea0f30f52011-06-25 17:34:18 +01002355 ---help---
2356 Add support for SCI-based features of the OLPC XO-1.5 laptop:
2357 - EC-driven system wakeups
2358 - AC adapter status updates
2359 - Battery status updates
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002360
Ed Wildgoosed4f3e352011-09-20 14:00:12 -07002361config ALIX
2362 bool "PCEngines ALIX System Support (LED setup)"
2363 select GPIOLIB
2364 ---help---
2365 This option enables system support for the PCEngines ALIX.
2366 At present this just sets up LEDs for GPIO control on
2367 ALIX2/3/6 boards. However, other system specific setup should
2368 get added here.
2369
2370 Note: You must still enable the drivers for GPIO and LED support
2371 (GPIO_CS5535 & LEDS_GPIO) to actually use the LEDs
2372
2373 Note: You have to set alix.force=1 for boards with Award BIOS.
2374
Philip Prindevilleda4e3302012-03-05 15:05:15 -08002375config NET5501
2376 bool "Soekris Engineering net5501 System Support (LEDS, GPIO, etc)"
2377 select GPIOLIB
2378 ---help---
2379 This option enables system support for the Soekris Engineering net5501.
2380
Philip A. Prindeville31970592012-01-14 01:45:39 -07002381config GEOS
2382 bool "Traverse Technologies GEOS System Support (LEDS, GPIO, etc)"
2383 select GPIOLIB
2384 depends on DMI
2385 ---help---
2386 This option enables system support for the Traverse Technologies GEOS.
2387
Vivien Didelot7d029122013-01-04 16:18:14 -05002388config TS5500
2389 bool "Technologic Systems TS-5500 platform support"
2390 depends on MELAN
2391 select CHECK_SIGNATURE
2392 select NEW_LEDS
2393 select LEDS_CLASS
2394 ---help---
2395 This option enables system support for the Technologic Systems TS-5500.
2396
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002397endif # X86_32
2398
Andreas Herrmann23ac4ae2010-09-17 18:03:43 +02002399config AMD_NB
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002400 def_bool y
Borislav Petkov0e152cd2010-03-12 15:43:03 +01002401 depends on CPU_SUP_AMD && PCI
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002402
2403source "drivers/pcmcia/Kconfig"
2404
2405source "drivers/pci/hotplug/Kconfig"
2406
Alexandre Bounine388b78a2011-03-23 16:43:03 -07002407config RAPIDIO
Alexandre Bouninefdf90ab2013-07-03 15:08:56 -07002408 tristate "RapidIO support"
Alexandre Bounine388b78a2011-03-23 16:43:03 -07002409 depends on PCI
2410 default n
2411 help
Alexandre Bouninefdf90ab2013-07-03 15:08:56 -07002412 If enabled this option will include drivers and the core
Alexandre Bounine388b78a2011-03-23 16:43:03 -07002413 infrastructure code to support RapidIO interconnect devices.
2414
2415source "drivers/rapidio/Kconfig"
2416
David Herrmanne3263ab2013-08-02 14:05:22 +02002417config X86_SYSFB
2418 bool "Mark VGA/VBE/EFI FB as generic system framebuffer"
2419 help
2420 Firmwares often provide initial graphics framebuffers so the BIOS,
2421 bootloader or kernel can show basic video-output during boot for
2422 user-guidance and debugging. Historically, x86 used the VESA BIOS
2423 Extensions and EFI-framebuffers for this, which are mostly limited
2424 to x86.
2425 This option, if enabled, marks VGA/VBE/EFI framebuffers as generic
2426 framebuffers so the new generic system-framebuffer drivers can be
2427 used on x86. If the framebuffer is not compatible with the generic
2428 modes, it is adverticed as fallback platform framebuffer so legacy
2429 drivers like efifb, vesafb and uvesafb can pick it up.
2430 If this option is not selected, all system framebuffers are always
2431 marked as fallback platform framebuffers as usual.
2432
2433 Note: Legacy fbdev drivers, including vesafb, efifb, uvesafb, will
2434 not be able to pick up generic system framebuffers if this option
2435 is selected. You are highly encouraged to enable simplefb as
2436 replacement if you select this option. simplefb can correctly deal
2437 with generic system framebuffers. But you should still keep vesafb
2438 and others enabled as fallback if a system framebuffer is
2439 incompatible with simplefb.
2440
2441 If unsure, say Y.
2442
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002443endmenu
2444
2445
2446menu "Executable file formats / Emulations"
2447
2448source "fs/Kconfig.binfmt"
2449
2450config IA32_EMULATION
2451 bool "IA32 Emulation"
2452 depends on X86_64
Randy Dunlapd1603992013-06-18 12:33:40 -07002453 select BINFMT_ELF
Roland McGratha97f52e2008-01-30 13:31:55 +01002454 select COMPAT_BINFMT_ELF
Catalin Marinasaf1839e2012-10-08 16:28:08 -07002455 select HAVE_UID16
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002456 ---help---
H. J. Lu5fd92e62012-02-19 10:40:03 -08002457 Include code to run legacy 32-bit programs under a
2458 64-bit kernel. You should likely turn this on, unless you're
2459 100% sure that you don't have any 32-bit programs left.
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002460
2461config IA32_AOUT
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002462 tristate "IA32 a.out support"
2463 depends on IA32_EMULATION
2464 ---help---
2465 Support old a.out binaries in the 32bit emulation.
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002466
H. Peter Anvin0bf62762012-02-27 14:09:10 -08002467config X86_X32
Kees Cook6ea30382012-10-02 11:16:47 -07002468 bool "x32 ABI for 64-bit mode"
2469 depends on X86_64 && IA32_EMULATION
H. J. Lu5fd92e62012-02-19 10:40:03 -08002470 ---help---
2471 Include code to run binaries for the x32 native 32-bit ABI
2472 for 64-bit processors. An x32 process gets access to the
2473 full 64-bit register file and wide data path while leaving
2474 pointers at 32 bits for smaller memory footprint.
2475
2476 You will need a recent binutils (2.22 or later) with
2477 elf32_x86_64 support enabled to compile a kernel with this
2478 option set.
2479
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002480config COMPAT
Harvey Harrison3c2362e2008-01-30 13:31:03 +01002481 def_bool y
H. Peter Anvin0bf62762012-02-27 14:09:10 -08002482 depends on IA32_EMULATION || X86_X32
Chris Metcalf48b25c42012-03-15 13:13:38 -04002483 select ARCH_WANT_OLD_COMPAT_IPC
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002484
Jan Beulich3120e252012-09-10 12:41:45 +01002485if COMPAT
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002486config COMPAT_FOR_U64_ALIGNMENT
Jan Beulich3120e252012-09-10 12:41:45 +01002487 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002488
2489config SYSVIPC_COMPAT
Harvey Harrison3c2362e2008-01-30 13:31:03 +01002490 def_bool y
Jan Beulich3120e252012-09-10 12:41:45 +01002491 depends on SYSVIPC
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002492
David Howellsee009e4a02011-03-07 15:06:20 +00002493config KEYS_COMPAT
Jan Beulich3120e252012-09-10 12:41:45 +01002494 def_bool y
2495 depends on KEYS
2496endif
David Howellsee009e4a02011-03-07 15:06:20 +00002497
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002498endmenu
2499
2500
Keith Packarde5beae12008-11-03 18:21:45 +01002501config HAVE_ATOMIC_IOMAP
2502 def_bool y
2503 depends on X86_32
2504
Alessandro Rubini4692d772012-04-04 19:39:58 +02002505config X86_DEV_DMA_OPS
2506 bool
Alessandro Rubini83125a32012-04-04 19:40:21 +02002507 depends on X86_64 || STA2X11
Alessandro Rubini4692d772012-04-04 19:39:58 +02002508
Alessandro Rubinif7219a52012-04-04 19:40:10 +02002509config X86_DMA_REMAP
2510 bool
Alessandro Rubini83125a32012-04-04 19:40:21 +02002511 depends on STA2X11
Alessandro Rubinif7219a52012-04-04 19:40:10 +02002512
Li, Aubrey93e5ead2014-06-30 14:08:42 +08002513config PMC_ATOM
2514 def_bool y
2515 depends on PCI
2516
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002517source "net/Kconfig"
2518
2519source "drivers/Kconfig"
2520
2521source "drivers/firmware/Kconfig"
2522
2523source "fs/Kconfig"
2524
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002525source "arch/x86/Kconfig.debug"
2526
2527source "security/Kconfig"
2528
2529source "crypto/Kconfig"
2530
Avi Kivityedf88412007-12-16 11:02:48 +02002531source "arch/x86/kvm/Kconfig"
2532
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002533source "lib/Kconfig"