blob: 6119d6c7002eaa00fecf659ebb355bf25640c351 [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"
4 default ARCH = "x86_64"
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
Sam Ravnborg1032c0b2007-11-06 21:35:08 +010019
20### Arch settings
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010021config X86
Harvey Harrison3c2362e2008-01-30 13:31:03 +010022 def_bool y
David Woodhousee17c6d52008-06-17 12:19:34 +010023 select HAVE_AOUT if X86_32
Ingo Molnara5574cf2008-05-05 23:19:50 +020024 select HAVE_UNSTABLE_SCHED_CLOCK
Sam Ravnborgec7748b2008-02-09 10:46:40 +010025 select HAVE_IDE
Mathieu Desnoyers42d4b832008-02-02 15:10:34 -050026 select HAVE_OPROFILE
Ralf Baechle8761f1a2011-06-01 19:05:09 +010027 select HAVE_PCSPKR_PLATFORM
Peter Zijlstracc2067a2010-11-16 21:49:01 +010028 select HAVE_PERF_EVENTS
Peter Zijlstrae360adb2010-10-14 14:01:34 +080029 select HAVE_IRQ_WORK
Rik van Riel28b2ee22008-07-23 21:27:05 -070030 select HAVE_IOREMAP_PROT
Mathieu Desnoyers3f550092008-02-02 15:10:35 -050031 select HAVE_KPROBES
Yinghai Lu72d7c3b2010-08-25 13:39:17 -070032 select HAVE_MEMBLOCK
Tejun Heo0608f702011-07-14 11:44:23 +020033 select HAVE_MEMBLOCK_NODE_MAP
Tejun Heoc378ddd2011-07-14 11:46:03 +020034 select ARCH_DISCARD_MEMBLOCK
Ingo Molnar1f972762008-07-26 13:52:50 +020035 select ARCH_WANT_OPTIONAL_GPIOLIB
Ingo Molnarda4276b2009-01-07 11:05:10 +010036 select ARCH_WANT_FRAME_POINTERS
FUJITA Tomonori7c095e42009-06-17 16:28:12 -070037 select HAVE_DMA_ATTRS
Marek Szyprowski0a2b9a62011-12-29 13:09:51 +010038 select HAVE_DMA_CONTIGUOUS if !SWIOTLB
Ananth N Mavinakayanahalli9edddaa2008-03-04 14:28:37 -080039 select HAVE_KRETPROBES
Masami Hiramatsuc0f7ac32010-02-25 08:34:46 -050040 select HAVE_OPTPROBES
Steven Rostedte4b2b882008-08-14 15:45:11 -040041 select HAVE_FTRACE_MCOUNT_RECORD
Steven Rostedtd57c5d52011-02-09 13:32:18 -050042 select HAVE_FENTRY if X86_64
Steven Rostedtcf4db252010-10-14 23:32:44 -040043 select HAVE_C_RECORDMCOUNT
Steven Rostedt677aa9f2008-05-17 00:01:36 -040044 select HAVE_DYNAMIC_FTRACE
Steven Rostedt606576c2008-10-06 19:06:12 -040045 select HAVE_FUNCTION_TRACER
Frederic Weisbecker48d68b22008-12-02 00:20:39 +010046 select HAVE_FUNCTION_GRAPH_TRACER
Steven Rostedt71e308a2009-06-18 12:45:08 -040047 select HAVE_FUNCTION_GRAPH_FP_TEST
Steven Rostedt60a7ecf2008-11-05 16:05:44 -050048 select HAVE_FUNCTION_TRACE_MCOUNT_TEST
Josh Stone66700002009-08-24 14:43:11 -070049 select HAVE_SYSCALL_TRACEPOINTS
Catalin Marinas7ac57a82012-10-08 16:28:16 -070050 select SYSCTL_EXCEPTION_TRACE
Ingo Molnare0ec9482009-01-27 17:01:14 +010051 select HAVE_KVM
Ingo Molnar49793b02009-01-27 17:02:29 +010052 select HAVE_ARCH_KGDB
Roland McGrath99bbc4b2008-04-20 14:35:12 -070053 select HAVE_ARCH_TRACEHOOK
Dmitry Baryshkov323ec002008-06-29 14:19:31 +040054 select HAVE_GENERIC_DMA_COHERENT if X86_32
Johannes Berg58340a02008-07-25 01:45:33 -070055 select HAVE_EFFICIENT_UNALIGNED_ACCESS
Török Edwin8d264872008-11-23 12:39:08 +020056 select USER_STACKTRACE_SUPPORT
Heiko Carstensf850c30c2010-02-10 17:25:17 +010057 select HAVE_REGS_AND_STACK_ACCESS_API
Joerg Roedel2118d0c2009-01-09 15:13:15 +010058 select HAVE_DMA_API_DEBUG
H. Peter Anvin2e9f3bd2009-01-04 15:41:25 -080059 select HAVE_KERNEL_GZIP
60 select HAVE_KERNEL_BZIP2
61 select HAVE_KERNEL_LZMA
Lasse Collin30314802011-01-12 17:01:24 -080062 select HAVE_KERNEL_XZ
Albin Tonnerre13510992010-01-08 14:42:45 -080063 select HAVE_KERNEL_LZO
K.Prasad0067f122009-06-01 23:43:57 +053064 select HAVE_HW_BREAKPOINT
Frederic Weisbecker01027522010-04-11 18:55:56 +020065 select HAVE_MIXED_BREAKPOINTS_REGS
Frederic Weisbecker99e8c5a2009-12-17 01:33:54 +010066 select PERF_EVENTS
Frederic Weisbeckerc01d4322010-05-15 22:57:48 +020067 select HAVE_PERF_EVENTS_NMI
Jiri Olsac5e63192012-08-07 15:20:36 +020068 select HAVE_PERF_REGS
Jiri Olsac5ebced2012-08-07 15:20:40 +020069 select HAVE_PERF_USER_STACK_DUMP
Catalin Marinasb69ec422012-10-08 16:28:11 -070070 select HAVE_DEBUG_KMEMLEAK
Frederic Weisbecker99e8c5a2009-12-17 01:33:54 +010071 select ANON_INODES
Heiko Carstens43570fd2012-01-12 17:17:27 -080072 select HAVE_ALIGNED_STRUCT_PAGE if SLUB && !M386
Heiko Carstens41561532012-01-12 17:17:30 -080073 select HAVE_CMPXCHG_LOCAL if !M386
Heiko Carstens25654092012-01-12 17:17:33 -080074 select HAVE_CMPXCHG_DOUBLE
Pekka Enberg0a4af3b2009-02-26 21:38:56 +020075 select HAVE_ARCH_KMEMCHECK
Avi Kivity7c68af62009-09-19 09:40:22 +030076 select HAVE_USER_RETURN_NOTIFIER
David Daneye39f5602012-01-10 15:10:21 -080077 select ARCH_BINFMT_ELF_RANDOMIZE_PIE
Steven Rostedt46eb3b62010-09-22 23:10:23 -040078 select HAVE_ARCH_JUMP_LABEL
Masami Hiramatsu3cba11d2010-10-14 12:10:42 +090079 select HAVE_TEXT_POKE_SMP
Thomas Gleixner3bb98082010-09-27 12:46:02 +000080 select HAVE_GENERIC_HARDIRQS
Catalin Marinas74634492012-07-30 14:41:09 -070081 select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
Yinghai Lu141d55e2011-10-12 11:53:17 -070082 select SPARSE_IRQ
Jan Beulichc49aa5b2011-03-08 09:24:26 +000083 select GENERIC_FIND_FIRST_BIT
Thomas Gleixner3bb98082010-09-27 12:46:02 +000084 select GENERIC_IRQ_PROBE
85 select GENERIC_PENDING_IRQ if SMP
Thomas Gleixner517e4982010-12-16 17:59:57 +010086 select GENERIC_IRQ_SHOW
Martin Schwidefskyd1748302011-08-23 15:29:42 +020087 select GENERIC_CLOCKEVENTS_MIN_ADJUST
Thomas Gleixnerc01858082011-02-07 02:24:08 +010088 select IRQ_FORCED_THREADING
Amerigo Wang351f8f82011-01-12 16:59:39 -080089 select USE_GENERIC_SMP_HELPERS if SMP
Sam Ravnborge47b65b2012-05-21 20:45:37 +020090 select HAVE_BPF_JIT if X86_64
Thomas Gleixner0a779c52011-06-09 13:08:26 +000091 select CLKEVT_I8253
Huang Yingdf013ff2011-07-13 13:14:22 +080092 select ARCH_HAVE_NMI_SAFE_CMPXCHG
Michael S. Tsirkin4673ca82011-11-24 14:54:28 +020093 select GENERIC_IOMAP
Linus Torvaldse419b4c2012-05-03 10:16:43 -070094 select DCACHE_WORD_ACCESS
Thomas Gleixner7eb43a62012-04-20 13:05:48 +000095 select GENERIC_SMP_IDLE_THREAD
Will Deaconc1d7e012012-07-30 14:42:46 -070096 select ARCH_WANT_IPC_PARSE_VERSION if X86_32
Will Drewryc6cfbeb2012-04-12 16:48:03 -050097 select HAVE_ARCH_SECCOMP_FILTER
David Daney8b5ad472012-04-24 11:23:15 -070098 select BUILDTIME_EXTABLE_SORT
Thomas Gleixnerbdebaf82012-05-18 16:45:44 +000099 select GENERIC_CMOS_UPDATE
100 select CLOCKSOURCE_WATCHDOG
101 select GENERIC_CLOCKEVENTS
102 select ARCH_CLOCKSOURCE_DATA if X86_64
103 select GENERIC_CLOCKEVENTS_BROADCAST if X86_64 || (X86_32 && X86_LOCAL_APIC)
104 select GENERIC_TIME_VSYSCALL if X86_64
105 select KTIME_SCALAR if X86_32
Linus Torvalds4ae73f22012-05-26 10:14:39 -0700106 select GENERIC_STRNCPY_FROM_USER
Linus Torvalds5723aa92012-05-26 11:09:53 -0700107 select GENERIC_STRNLEN_USER
Frederic Weisbeckeredf55fd2012-07-11 20:26:39 +0200108 select HAVE_RCU_USER_QS if X86_64
Frederic Weisbeckerfdf9c352012-09-09 14:56:31 +0200109 select HAVE_IRQ_TIME_ACCOUNTING
Balbir Singh7d8330a2008-02-10 12:46:28 +0530110
Ingo Molnarba7e4d12009-06-06 13:58:12 +0200111config INSTRUCTION_DECODER
Jan Beulich3120e252012-09-10 12:41:45 +0100112 def_bool y
113 depends on KPROBES || PERF_EVENTS || UPROBES
Ingo Molnarba7e4d12009-06-06 13:58:12 +0200114
Linus Torvalds51b26ad2009-04-26 10:12:47 -0700115config OUTPUT_FORMAT
116 string
117 default "elf32-i386" if X86_32
118 default "elf64-x86-64" if X86_64
119
Sam Ravnborg73531902008-05-25 23:03:18 +0200120config ARCH_DEFCONFIG
Sam Ravnborgb9b39bf2008-04-29 12:48:15 +0200121 string
Sam Ravnborg73531902008-05-25 23:03:18 +0200122 default "arch/x86/configs/i386_defconfig" if X86_32
123 default "arch/x86/configs/x86_64_defconfig" if X86_64
Sam Ravnborgb9b39bf2008-04-29 12:48:15 +0200124
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100125config LOCKDEP_SUPPORT
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100126 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100127
128config STACKTRACE_SUPPORT
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100129 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100130
Heiko Carstensaa7d9352008-02-01 17:45:14 +0100131config HAVE_LATENCYTOP_SUPPORT
132 def_bool y
133
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100134config MMU
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100135 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100136
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100137config SBUS
138 bool
139
FUJITA Tomonori3bc4e452010-03-10 15:23:22 -0800140config NEED_DMA_MAP_STATE
Jan Beulich3120e252012-09-10 12:41:45 +0100141 def_bool y
142 depends on X86_64 || INTEL_IOMMU || DMA_API_DEBUG
FUJITA Tomonori3bc4e452010-03-10 15:23:22 -0800143
FUJITA Tomonori18e98302010-05-26 14:44:32 -0700144config NEED_SG_DMA_LENGTH
Andrew Morton4a14d842010-05-26 14:44:33 -0700145 def_bool y
FUJITA Tomonori18e98302010-05-26 14:44:32 -0700146
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100147config GENERIC_ISA_DMA
Jan Beulich3120e252012-09-10 12:41:45 +0100148 def_bool y
149 depends on ISA_DMA_API
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100150
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100151config GENERIC_BUG
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100152 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100153 depends on BUG
Jan Beulichb93a5312008-12-16 11:40:27 +0000154 select GENERIC_BUG_RELATIVE_POINTERS if X86_64
155
156config GENERIC_BUG_RELATIVE_POINTERS
157 bool
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100158
159config GENERIC_HWEIGHT
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100160 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100161
Florian Fainellia6082952008-01-30 13:33:35 +0100162config GENERIC_GPIO
Jan Beulich9ba16082008-10-15 22:01:38 -0700163 bool
Florian Fainellia6082952008-01-30 13:33:35 +0100164
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100165config ARCH_MAY_HAVE_PC_FDC
Jan Beulich3120e252012-09-10 12:41:45 +0100166 def_bool y
167 depends on ISA_DMA_API
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100168
Sam Ravnborg1032c0b2007-11-06 21:35:08 +0100169config RWSEM_GENERIC_SPINLOCK
Jan Beulich3120e252012-09-10 12:41:45 +0100170 def_bool y
171 depends on !X86_XADD
Sam Ravnborg1032c0b2007-11-06 21:35:08 +0100172
173config RWSEM_XCHGADD_ALGORITHM
Jan Beulich3120e252012-09-10 12:41:45 +0100174 def_bool y
175 depends on X86_XADD
Sam Ravnborg1032c0b2007-11-06 21:35:08 +0100176
Sam Ravnborg1032c0b2007-11-06 21:35:08 +0100177config GENERIC_CALIBRATE_DELAY
178 def_bool y
179
venkatesh.pallipadi@intel.com9a0b8412008-01-31 17:35:06 -0800180config ARCH_HAS_CPU_RELAX
181 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100182
Venkatesh Pallipadi89cedfe2008-10-16 19:00:08 -0400183config ARCH_HAS_DEFAULT_IDLE
184 def_bool y
185
Pekka Enberg1b27d052008-04-28 02:12:22 -0700186config ARCH_HAS_CACHE_LINE_SIZE
187 def_bool y
188
Thomas Renningerfad12ac2012-01-26 00:09:14 +0100189config ARCH_HAS_CPU_AUTOPROBE
190 def_bool y
191
Mike Travisdd5af902008-01-30 13:33:32 +0100192config HAVE_SETUP_PER_CPU_AREA
Brian Gerst89c9c4c2009-01-27 12:56:48 +0900193 def_bool y
travis@sgi.comb32ef632008-01-30 13:32:51 +0100194
Tejun Heo08fc4582009-08-14 15:00:49 +0900195config NEED_PER_CPU_EMBED_FIRST_CHUNK
196 def_bool y
197
198config NEED_PER_CPU_PAGE_FIRST_CHUNK
Tejun Heo11124412009-02-20 16:29:09 +0900199 def_bool y
200
Johannes Berg801e4062007-12-08 02:12:39 +0100201config ARCH_HIBERNATION_POSSIBLE
202 def_bool y
Johannes Berg801e4062007-12-08 02:12:39 +0100203
Johannes Bergf4cb5702007-12-08 02:14:00 +0100204config ARCH_SUSPEND_POSSIBLE
205 def_bool y
Johannes Bergf4cb5702007-12-08 02:14:00 +0100206
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100207config ZONE_DMA32
208 bool
209 default X86_64
210
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100211config AUDIT_ARCH
212 bool
213 default X86_64
214
Ingo Molnar765c68b2008-04-09 11:03:37 +0200215config ARCH_SUPPORTS_OPTIMIZED_INLINING
216 def_bool y
217
Akinobu Mita6a11f752009-03-31 15:23:17 -0700218config ARCH_SUPPORTS_DEBUG_PAGEALLOC
219 def_bool y
220
Shane Wang69575d32009-09-01 18:25:07 -0700221config HAVE_INTEL_TXT
222 def_bool y
Suresh Siddhad3f13812011-08-23 17:05:25 -0700223 depends on EXPERIMENTAL && INTEL_IOMMU && ACPI
Shane Wang69575d32009-09-01 18:25:07 -0700224
Sam Ravnborg6b0c3d42008-01-30 13:32:27 +0100225config X86_32_SMP
226 def_bool y
227 depends on X86_32 && SMP
228
229config X86_64_SMP
230 def_bool y
231 depends on X86_64 && SMP
232
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100233config X86_HT
Jan Beulich6fc108a2010-04-21 15:23:44 +0100234 def_bool y
Adrian Bunkee0011a2007-12-04 17:19:07 +0100235 depends on SMP
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100236
Tejun Heoccbeed32009-02-09 22:17:40 +0900237config X86_32_LAZY_GS
238 def_bool y
Tejun Heo60a53172009-02-09 22:17:40 +0900239 depends on X86_32 && !CC_STACKPROTECTOR
Tejun Heoccbeed32009-02-09 22:17:40 +0900240
Borislav Petkovd61931d2010-03-05 17:34:46 +0100241config ARCH_HWEIGHT_CFLAGS
242 string
243 default "-fcall-saved-ecx -fcall-saved-edx" if X86_32
244 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
245
Borislav Petkovd7c53c92010-08-19 20:10:29 +0200246config ARCH_CPU_PROBE_RELEASE
247 def_bool y
248 depends on HOTPLUG_CPU
249
Srikar Dronamraju2b144492012-02-09 14:56:42 +0530250config ARCH_SUPPORTS_UPROBES
251 def_bool y
252
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100253source "init/Kconfig"
Matt Helsleydc52ddc2008-10-18 20:27:21 -0700254source "kernel/Kconfig.freezer"
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100255
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100256menu "Processor type and features"
257
Randy Dunlap5ee71532012-01-16 11:57:18 -0800258config ZONE_DMA
259 bool "DMA memory allocation support" if EXPERT
260 default y
261 help
262 DMA memory allocation support allows devices with less than 32-bit
263 addressing to allocate within the first 16MB of address space.
264 Disable if no such devices will be used.
265
266 If unsure, say Y.
267
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100268config SMP
269 bool "Symmetric multi-processing support"
270 ---help---
271 This enables support for systems with more than one CPU. If you have
272 a system with only one CPU, like most personal computers, say N. If
273 you have a system with more than one CPU, say Y.
274
275 If you say N here, the kernel will run on single and multiprocessor
276 machines, but will use only one CPU of a multiprocessor machine. If
277 you say Y here, the kernel will run on many, but not all,
278 singleprocessor machines. On a singleprocessor machine, the kernel
279 will run faster if you say N here.
280
281 Note that if you say Y here and choose architecture "586" or
282 "Pentium" under "Processor family", the kernel will not work on 486
283 architectures. Similarly, multiprocessor kernels for the "PPro"
284 architecture may not work on all Pentium based boards.
285
286 People using multiprocessor machines who say Y here should also say
287 Y to "Enhanced Real Time Clock Support", below. The "Advanced Power
288 Management" code will be disabled if you say Y here.
289
Paul Bolle395cf962011-08-15 02:02:26 +0200290 See also <file:Documentation/x86/i386/IO-APIC.txt>,
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100291 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
292 <http://www.tldp.org/docs.html#howto>.
293
294 If you don't know what to do here, say N.
295
Yinghai Lu06cd9a72009-02-16 17:29:58 -0800296config X86_X2APIC
297 bool "Support x2apic"
Suresh Siddhad3f13812011-08-23 17:05:25 -0700298 depends on X86_LOCAL_APIC && X86_64 && IRQ_REMAP
Yinghai Lu06cd9a72009-02-16 17:29:58 -0800299 ---help---
300 This enables x2apic support on CPUs that have this feature.
301
302 This allows 32-bit apic IDs (so it can support very large systems),
303 and accesses the local apic via MSRs not via mmio.
304
Yinghai Lu06cd9a72009-02-16 17:29:58 -0800305 If you don't know what to do here, say N.
306
Yinghai Lu6695c852008-06-19 12:13:09 -0700307config X86_MPPARSE
Jan Beulich7a527682008-10-30 10:38:24 +0000308 bool "Enable MPS table" if ACPI
309 default y
Ingo Molnar5ab74722008-07-10 14:42:03 +0200310 depends on X86_LOCAL_APIC
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100311 ---help---
Yinghai Lu6695c852008-06-19 12:13:09 -0700312 For old smp systems that do not have proper acpi support. Newer systems
313 (esp with 64bit cpus) with acpi support, MADT and DSDT will override it
Yinghai Lu6695c852008-06-19 12:13:09 -0700314
Yinghai Lu26f7ef12009-01-29 14:19:22 -0800315config X86_BIGSMP
316 bool "Support for big SMP systems with more than 8 CPUs"
317 depends on X86_32 && SMP
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100318 ---help---
Yinghai Lu26f7ef12009-01-29 14:19:22 -0800319 This option is needed for the systems that have more than 8 CPUs
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100320
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800321if X86_32
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800322config X86_EXTENDED_PLATFORM
323 bool "Support for extended (non-PC) x86 platforms"
324 default y
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100325 ---help---
Ingo Molnar06ac8342009-01-27 18:11:43 +0100326 If you disable this option then the kernel will only support
327 standard PC platforms. (which covers the vast majority of
328 systems out there.)
329
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800330 If you enable this option then you'll be able to select support
331 for the following (non-PC) 32 bit x86 platforms:
332 AMD Elan
333 NUMAQ (IBM/Sequent)
334 RDC R-321x SoC
335 SGI 320/540 (Visual Workstation)
Alessandro Rubini83125a32012-04-04 19:40:21 +0200336 STA2X11-based (e.g. Northville)
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800337 Summit/EXA (IBM x440)
338 Unisys ES7000 IA32 series
Thomas Gleixner3f4110a2009-08-29 14:54:20 +0200339 Moorestown MID devices
Ingo Molnar06ac8342009-01-27 18:11:43 +0100340
341 If you have one of these systems, or if you want to build a
342 generic distribution kernel, say Y here - otherwise say N.
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800343endif
Ingo Molnar06ac8342009-01-27 18:11:43 +0100344
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800345if X86_64
346config X86_EXTENDED_PLATFORM
347 bool "Support for extended (non-PC) x86 platforms"
348 default y
349 ---help---
350 If you disable this option then the kernel will only support
351 standard PC platforms. (which covers the vast majority of
352 systems out there.)
353
354 If you enable this option then you'll be able to select support
355 for the following (non-PC) 64 bit x86 platforms:
Steffen Persvold44b111b52011-12-06 00:07:26 +0800356 Numascale NumaChip
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800357 ScaleMP vSMP
358 SGI Ultraviolet
359
360 If you have one of these systems, or if you want to build a
361 generic distribution kernel, say Y here - otherwise say N.
362endif
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800363# This is an alphabetically sorted list of 64 bit extended platforms
364# Please maintain the alphabetic order if and when there are additions
Steffen Persvold44b111b52011-12-06 00:07:26 +0800365config X86_NUMACHIP
366 bool "Numascale NumaChip"
367 depends on X86_64
368 depends on X86_EXTENDED_PLATFORM
369 depends on NUMA
370 depends on SMP
371 depends on X86_X2APIC
Steffen Persvold44b111b52011-12-06 00:07:26 +0800372 ---help---
373 Adds support for Numascale NumaChip large-SMP systems. Needed to
374 enable more than ~168 cores.
375 If you don't have one of these, you should say N here.
Nick Piggin03b48632009-01-20 04:36:04 +0100376
Ingo Molnar6a485652009-01-27 18:29:13 +0100377config X86_VSMP
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800378 bool "ScaleMP vSMP"
Randy Dunlap03f1a172010-10-13 21:00:23 -0700379 select PARAVIRT_GUEST
Ingo Molnar6a485652009-01-27 18:29:13 +0100380 select PARAVIRT
381 depends on X86_64 && PCI
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800382 depends on X86_EXTENDED_PLATFORM
Shai Fultheimead91d42012-04-16 10:39:35 +0300383 depends on SMP
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100384 ---help---
Ingo Molnar6a485652009-01-27 18:29:13 +0100385 Support for ScaleMP vSMP systems. Say 'Y' here if this kernel is
386 supposed to run on these EM64T-based machines. Only choose this option
387 if you have one of these machines.
388
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800389config X86_UV
390 bool "SGI Ultraviolet"
391 depends on X86_64
392 depends on X86_EXTENDED_PLATFORM
Jack Steiner54c28d22009-04-03 15:39:42 -0500393 depends on NUMA
Suresh Siddha9d6c26e2009-04-20 13:02:31 -0700394 depends on X86_X2APIC
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800395 ---help---
396 This option is needed in order to support SGI Ultraviolet systems.
397 If you don't have one of these, you should say N here.
398
399# Following is an alphabetically sorted list of 32 bit extended platforms
400# Please maintain the alphabetic order if and when there are additions
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100401
Thomas Gleixnerc751e172010-11-09 12:08:04 -0800402config X86_INTEL_CE
403 bool "CE4100 TV platform"
404 depends on PCI
405 depends on PCI_GODIRECT
406 depends on X86_32
407 depends on X86_EXTENDED_PLATFORM
Dirk Brandewie37bc9f52010-11-09 12:08:08 -0800408 select X86_REBOOTFIXUPS
Sebastian Andrzej Siewiorda6b7372011-02-22 21:07:37 +0100409 select OF
410 select OF_EARLY_FLATTREE
Grant Likelyb4e51852011-12-16 15:50:17 -0700411 select IRQ_DOMAIN
Thomas Gleixnerc751e172010-11-09 12:08:04 -0800412 ---help---
413 Select for the Intel CE media processor (CE4100) SOC.
414 This option compiles in support for the CE4100 SOC for settop
415 boxes and media devices.
416
Alan Coxdd137522011-12-05 23:14:39 +0000417config X86_WANT_INTEL_MID
Alan Cox43605ef2011-07-12 17:49:29 +0100418 bool "Intel MID platform support"
419 depends on X86_32
420 depends on X86_EXTENDED_PLATFORM
421 ---help---
422 Select to build a kernel capable of supporting Intel MID platform
423 systems which do not have the PCI legacy interfaces (Moorestown,
424 Medfield). If you are building for a PC class system say N here.
425
Alan Coxdd137522011-12-05 23:14:39 +0000426if X86_WANT_INTEL_MID
Alan Cox43605ef2011-07-12 17:49:29 +0100427
Alan Cox4e2b1c42011-12-06 13:28:22 +0000428config X86_INTEL_MID
429 bool
430
Alan Cox1ea7c672011-11-10 13:29:14 +0000431config X86_MDFLD
432 bool "Medfield MID platform"
433 depends on PCI
434 depends on PCI_GOANY
435 depends on X86_IO_APIC
Alan Cox7c9c3a12011-12-29 14:43:16 +0000436 select X86_INTEL_MID
437 select SFI
438 select DW_APB_TIMER
Alan Cox1ea7c672011-11-10 13:29:14 +0000439 select APB_TIMER
440 select I2C
441 select SPI
442 select INTEL_SCU_IPC
443 select X86_PLATFORM_DEVICES
Mika Westerberg15a713d2012-01-26 17:35:05 +0000444 select MFD_INTEL_MSIC
Alan Cox1ea7c672011-11-10 13:29:14 +0000445 ---help---
446 Medfield is Intel's Low Power Intel Architecture (LPIA) based Moblin
447 Internet Device(MID) platform.
448 Unlike standard x86 PCs, Medfield does not have many legacy devices
449 nor standard legacy replacement devices/features. e.g. Medfield does
450 not contain i8259, i8254, HPET, legacy BIOS, most of the io ports.
451
Alan Cox43605ef2011-07-12 17:49:29 +0100452endif
453
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800454config X86_RDC321X
455 bool "RDC R-321x SoC"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100456 depends on X86_32
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800457 depends on X86_EXTENDED_PLATFORM
458 select M486
459 select X86_REBOOTFIXUPS
460 ---help---
461 This option is needed for RDC R-321x system-on-chip, also known
462 as R-8610-(G).
463 If you don't have one of these chips, you should say N here.
464
Ingo Molnare0c7ae32009-01-27 18:43:09 +0100465config X86_32_NON_STANDARD
Ingo Molnar9c398012009-01-27 18:24:57 +0100466 bool "Support non-standard 32-bit SMP architectures"
467 depends on X86_32 && SMP
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800468 depends on X86_EXTENDED_PLATFORM
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100469 ---help---
Alessandro Rubini83125a32012-04-04 19:40:21 +0200470 This option compiles in the NUMAQ, Summit, bigsmp, ES7000,
471 STA2X11, default subarchitectures. It is intended for a generic
472 binary kernel. If you select them all, kernel will probe it
473 one by one and will fallback to default.
Yinghai Lud49c4282008-06-08 18:31:54 -0700474
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800475# Alphabetically sorted list of Non standard 32 bit platforms
Yinghai Lud49c4282008-06-08 18:31:54 -0700476
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100477config X86_NUMAQ
478 bool "NUMAQ (IBM/Sequent)"
Ingo Molnare0c7ae32009-01-27 18:43:09 +0100479 depends on X86_32_NON_STANDARD
Pan, Jacob juna92d1522010-02-24 16:59:55 -0800480 depends on PCI
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100481 select NUMA
Ingo Molnar9c398012009-01-27 18:24:57 +0100482 select X86_MPPARSE
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100483 ---help---
Yinghai Lud49c4282008-06-08 18:31:54 -0700484 This option is used for getting Linux to run on a NUMAQ (IBM/Sequent)
485 NUMA multiquad box. This changes the way that processors are
486 bootstrapped, and uses Clustered Logical APIC addressing mode instead
487 of Flat Logical. You will need a new lynxer.elf file to flash your
488 firmware with - send email to <Martin.Bligh@us.ibm.com>.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100489
Linus Torvaldsd949f362009-09-26 09:35:07 -0700490config X86_SUPPORTS_MEMORY_FAILURE
Jan Beulich6fc108a2010-04-21 15:23:44 +0100491 def_bool y
Linus Torvaldsd949f362009-09-26 09:35:07 -0700492 # MCE code calls memory_failure():
493 depends on X86_MCE
494 # On 32-bit this adds too big of NODES_SHIFT and we run out of page flags:
495 depends on !X86_NUMAQ
496 # On 32-bit SPARSEMEM adds too big of SECTIONS_WIDTH:
497 depends on X86_64 || !SPARSEMEM
498 select ARCH_SUPPORTS_MEMORY_FAILURE
Linus Torvaldsd949f362009-09-26 09:35:07 -0700499
Ingo Molnar1b84e1c2008-07-10 15:55:27 +0200500config X86_VISWS
501 bool "SGI 320/540 (Visual Workstation)"
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800502 depends on X86_32 && PCI && X86_MPPARSE && PCI_GODIRECT
503 depends on X86_32_NON_STANDARD
504 ---help---
Ingo Molnar1b84e1c2008-07-10 15:55:27 +0200505 The SGI Visual Workstation series is an IA32-based workstation
506 based on SGI systems chips with some legacy PC hardware attached.
507
508 Say Y here to create a kernel to run on the SGI 320 or 540.
509
510 A kernel compiled for the Visual Workstation will run on general
511 PCs as well. See <file:Documentation/sgi-visws.txt> for details.
512
Alessandro Rubini83125a32012-04-04 19:40:21 +0200513config STA2X11
514 bool "STA2X11 Companion Chip Support"
515 depends on X86_32_NON_STANDARD && PCI
516 select X86_DEV_DMA_OPS
517 select X86_DMA_REMAP
518 select SWIOTLB
519 select MFD_STA2X11
520 select ARCH_REQUIRE_GPIOLIB
521 default n
522 ---help---
523 This adds support for boards based on the STA2X11 IO-Hub,
524 a.k.a. "ConneXt". The chip is used in place of the standard
525 PC chipset, so all "standard" peripherals are missing. If this
526 option is selected the kernel will still be able to boot on
527 standard PC machines.
528
Ingo Molnar9c398012009-01-27 18:24:57 +0100529config X86_SUMMIT
530 bool "Summit/EXA (IBM x440)"
Ingo Molnare0c7ae32009-01-27 18:43:09 +0100531 depends on X86_32_NON_STANDARD
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100532 ---help---
Ingo Molnar9c398012009-01-27 18:24:57 +0100533 This option is needed for IBM systems that use the Summit/EXA chipset.
534 In particular, it is needed for the x440.
Ingo Molnar1f972762008-07-26 13:52:50 +0200535
Ingo Molnar9c398012009-01-27 18:24:57 +0100536config X86_ES7000
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800537 bool "Unisys ES7000 IA32 series"
Yinghai Lu26f7ef12009-01-29 14:19:22 -0800538 depends on X86_32_NON_STANDARD && X86_BIGSMP
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100539 ---help---
Ingo Molnar9c398012009-01-27 18:24:57 +0100540 Support for Unisys ES7000 systems. Say 'Y' here if this kernel is
541 supposed to run on an IA32-based Unisys ES7000 system.
542
Shérab82148d12010-09-25 06:06:57 +0200543config X86_32_IRIS
544 tristate "Eurobraille/Iris poweroff module"
545 depends on X86_32
546 ---help---
547 The Iris machines from EuroBraille do not have APM or ACPI support
548 to shut themselves down properly. A special I/O sequence is
549 needed to do so, which is what this module does at
550 kernel shutdown.
551
552 This is only for Iris machines from EuroBraille.
553
554 If unused, say N.
555
Ingo Molnarae1e9132008-11-11 09:05:16 +0100556config SCHED_OMIT_FRAME_POINTER
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100557 def_bool y
558 prompt "Single-depth WCHAN output"
Ken Chena87d0912008-11-06 11:10:49 -0800559 depends on X86
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100560 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100561 Calculate simpler /proc/<PID>/wchan values. If this option
562 is disabled then wchan values will recurse back to the
563 caller function. This provides more accurate wchan values,
564 at the expense of slightly more scheduling overhead.
565
566 If in doubt, say "Y".
567
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100568menuconfig PARAVIRT_GUEST
569 bool "Paravirtualized guest support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100570 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100571 Say Y here to get to see options related to running Linux under
572 various hypervisors. This option alone does not add any kernel code.
573
574 If you say N, all options in this submenu will be skipped and disabled.
575
576if PARAVIRT_GUEST
577
Glauber Costa095c0aa2011-07-11 15:28:18 -0400578config PARAVIRT_TIME_ACCOUNTING
579 bool "Paravirtual steal time accounting"
580 select PARAVIRT
581 default n
582 ---help---
583 Select this option to enable fine granularity task steal time
584 accounting. Time spent executing other tasks in parallel with
585 the current vCPU is discounted from the vCPU power. To account for
586 that, there can be a small performance impact.
587
588 If in doubt, say N here.
589
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100590source "arch/x86/xen/Kconfig"
591
Marcelo Tosatti90993cd2012-08-16 17:00:19 -0300592config KVM_GUEST
593 bool "KVM Guest support (including kvmclock)"
594 select PARAVIRT
Glauber de Oliveira Costa790c73f2008-02-15 17:52:48 -0200595 select PARAVIRT
Gerd Hoffmannf6e16d52008-06-03 16:17:32 +0200596 select PARAVIRT_CLOCK
Marcelo Tosatti90993cd2012-08-16 17:00:19 -0300597 default y if PARAVIRT_GUEST
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100598 ---help---
599 This option enables various optimizations for running under the KVM
Marcelo Tosatti90993cd2012-08-16 17:00:19 -0300600 hypervisor. It includes a paravirtualized clock, so that instead
601 of relying on a PIT (or probably other) emulation by the
602 underlying device model, the host provides the guest with
603 timing infrastructure such as time of day, and system time
Marcelo Tosatti0cf1bfd2008-02-22 12:21:36 -0500604
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100605source "arch/x86/lguest/Kconfig"
606
Eduardo Pereira Habkoste61bd942008-01-30 13:33:32 +0100607config PARAVIRT
608 bool "Enable paravirtualization code"
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100609 ---help---
Eduardo Pereira Habkoste61bd942008-01-30 13:33:32 +0100610 This changes the kernel so it can modify itself when it is run
611 under a hypervisor, potentially improving performance significantly
612 over full virtualization. However, when run without a hypervisor
613 the kernel is theoretically slower and slightly larger.
614
Jeremy Fitzhardingeb4ecc122009-05-13 17:16:55 -0700615config PARAVIRT_SPINLOCKS
616 bool "Paravirtualization layer for spinlocks"
617 depends on PARAVIRT && SMP && EXPERIMENTAL
618 ---help---
619 Paravirtualized spinlocks allow a pvops backend to replace the
620 spinlock implementation with something virtualization-friendly
621 (for example, block the virtual CPU rather than spinning).
622
623 Unfortunately the downside is an up to 5% performance hit on
624 native kernels, with various workloads.
625
626 If you are unsure how to answer this question, answer N.
627
Gerd Hoffmann7af192c2008-06-03 16:17:29 +0200628config PARAVIRT_CLOCK
629 bool
Gerd Hoffmann7af192c2008-06-03 16:17:29 +0200630
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100631endif
632
Jeremy Fitzhardinge97349132008-06-25 00:19:14 -0400633config PARAVIRT_DEBUG
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100634 bool "paravirt-ops debugging"
635 depends on PARAVIRT && DEBUG_KERNEL
636 ---help---
637 Enable to debug paravirt_ops internals. Specifically, BUG if
638 a paravirt_op is missing when it is called.
Jeremy Fitzhardinge97349132008-06-25 00:19:14 -0400639
Yinghai Lu08677212010-02-10 01:20:20 -0800640config NO_BOOTMEM
Yinghai Lu774ea0b2010-08-25 13:39:18 -0700641 def_bool y
Yinghai Lu08677212010-02-10 01:20:20 -0800642
Yinghai Lu03273182008-04-18 17:49:15 -0700643config MEMTEST
644 bool "Memtest"
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100645 ---help---
Yinghai Luc64df702008-03-21 18:56:19 -0700646 This option adds a kernel parameter 'memtest', which allows memtest
Yinghai Lu03273182008-04-18 17:49:15 -0700647 to be set.
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100648 memtest=0, mean disabled; -- default
649 memtest=1, mean do 1 test pattern;
650 ...
651 memtest=4, mean do 4 test patterns.
Thomas Gleixneraba37282008-07-15 14:48:48 +0200652 If you are unsure how to answer this question, answer N.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100653
654config X86_SUMMIT_NUMA
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100655 def_bool y
Ingo Molnare0c7ae32009-01-27 18:43:09 +0100656 depends on X86_32 && NUMA && X86_32_NON_STANDARD
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100657
658config X86_CYCLONE_TIMER
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100659 def_bool y
Alessandro Rubinif9b15df2011-10-29 00:48:42 +0200660 depends on X86_SUMMIT
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100661
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100662source "arch/x86/Kconfig.cpu"
663
664config HPET_TIMER
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100665 def_bool X86_64
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100666 prompt "HPET Timer Support" if X86_32
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100667 ---help---
668 Use the IA-PC HPET (High Precision Event Timer) to manage
669 time in preference to the PIT and RTC, if a HPET is
670 present.
671 HPET is the next generation timer replacing legacy 8254s.
672 The HPET provides a stable time base on SMP
673 systems, unlike the TSC, but it is more expensive to access,
674 as it is off-chip. You can find the HPET spec at
675 <http://www.intel.com/hardwaredesign/hpetspec_1.pdf>.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100676
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100677 You can safely choose Y here. However, HPET will only be
678 activated if the platform and the BIOS support this feature.
679 Otherwise the 8254 will be used for timing services.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100680
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100681 Choose N to continue using the legacy 8254 timer.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100682
683config HPET_EMULATE_RTC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100684 def_bool y
Bernhard Walle9d8af782008-02-06 01:38:52 -0800685 depends on HPET_TIMER && (RTC=y || RTC=m || RTC_DRV_CMOS=m || RTC_DRV_CMOS=y)
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100686
Jacob Panbb24c472009-09-02 07:37:17 -0700687config APB_TIMER
Alan Cox933b9462011-12-17 17:43:40 +0000688 def_bool y if X86_INTEL_MID
689 prompt "Intel MID APB Timer Support" if X86_INTEL_MID
Jamie Iles06c3df42011-06-06 12:43:07 +0100690 select DW_APB_TIMER
Alan Coxa0c38322011-12-17 21:57:25 +0000691 depends on X86_INTEL_MID && SFI
Jacob Panbb24c472009-09-02 07:37:17 -0700692 help
693 APB timer is the replacement for 8254, HPET on X86 MID platforms.
694 The APBT provides a stable time base on SMP
695 systems, unlike the TSC, but it is more expensive to access,
696 as it is off-chip. APB timers are always running regardless of CPU
697 C states, they are used as per CPU clockevent device when possible.
698
David Rientjes6a108a12011-01-20 14:44:16 -0800699# Mark as expert because too many people got it wrong.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100700# The code disables itself when not needed.
Thomas Petazzoni7ae93922008-04-28 02:14:14 -0700701config DMI
702 default y
David Rientjes6a108a12011-01-20 14:44:16 -0800703 bool "Enable DMI scanning" if EXPERT
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100704 ---help---
Thomas Petazzoni7ae93922008-04-28 02:14:14 -0700705 Enabled scanning of DMI to identify machine quirks. Say Y
706 here unless you have verified that your setup is not
707 affected by entries in the DMI blacklist. Required by PNP
708 BIOS code.
709
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100710config GART_IOMMU
David Rientjes6a108a12011-01-20 14:44:16 -0800711 bool "GART IOMMU support" if EXPERT
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100712 default y
713 select SWIOTLB
Andreas Herrmann23ac4ae2010-09-17 18:03:43 +0200714 depends on X86_64 && PCI && AMD_NB
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100715 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100716 Support for full DMA access of devices with 32bit memory access only
717 on systems with more than 3GB. This is usually needed for USB,
718 sound, many IDE/SATA chipsets and some other devices.
719 Provides a driver for the AMD Athlon64/Opteron/Turion/Sempron GART
720 based hardware IOMMU and a software bounce buffer based IOMMU used
721 on Intel systems and as fallback.
722 The code is only active when needed (enough memory and limited
723 device) unless CONFIG_IOMMU_DEBUG or iommu=force is specified
724 too.
725
726config CALGARY_IOMMU
727 bool "IBM Calgary IOMMU support"
728 select SWIOTLB
729 depends on X86_64 && PCI && EXPERIMENTAL
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100730 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100731 Support for hardware IOMMUs in IBM's xSeries x366 and x460
732 systems. Needed to run systems with more than 3GB of memory
733 properly with 32-bit PCI devices that do not support DAC
734 (Double Address Cycle). Calgary also supports bus level
735 isolation, where all DMAs pass through the IOMMU. This
736 prevents them from going anywhere except their intended
737 destination. This catches hard-to-find kernel bugs and
738 mis-behaving drivers and devices that do not use the DMA-API
739 properly to set up their DMA buffers. The IOMMU can be
740 turned off at boot time with the iommu=off parameter.
741 Normally the kernel will make the right choice by itself.
742 If unsure, say Y.
743
744config CALGARY_IOMMU_ENABLED_BY_DEFAULT
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100745 def_bool y
746 prompt "Should Calgary be enabled by default?"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100747 depends on CALGARY_IOMMU
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100748 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100749 Should Calgary be enabled by default? if you choose 'y', Calgary
750 will be used (if it exists). If you choose 'n', Calgary will not be
751 used even if it exists. If you choose 'n' and would like to use
752 Calgary anyway, pass 'iommu=calgary' on the kernel command line.
753 If unsure, say Y.
754
755# need this always selected by IOMMU for the VIA workaround
756config SWIOTLB
Joerg Roedela1afd012008-11-18 12:44:21 +0100757 def_bool y if X86_64
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100758 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100759 Support for software bounce buffers used on x86-64 systems
Joe Millenbach4454d322012-09-02 17:38:20 -0700760 which don't have a hardware IOMMU. Using this PCI devices
761 which can only access 32-bits of memory can be used on systems
762 with more than 3 GB of memory.
763 If unsure, say Y.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100764
FUJITA Tomonoria8522502008-04-29 00:59:36 -0700765config IOMMU_HELPER
Jan Beulich3120e252012-09-10 12:41:45 +0100766 def_bool y
767 depends on CALGARY_IOMMU || GART_IOMMU || SWIOTLB || AMD_IOMMU
Linus Torvaldsd25e26b2008-08-25 14:15:38 -0700768
Mike Travis1184dc22008-05-12 21:21:12 +0200769config MAXSMP
Samuel Thibaultddb0c5a2010-08-21 21:32:41 +0200770 bool "Enable Maximum number of SMP Processors and NUMA Nodes"
Mike Travis36f51012008-12-16 17:33:51 -0800771 depends on X86_64 && SMP && DEBUG_KERNEL && EXPERIMENTAL
772 select CPUMASK_OFFSTACK
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100773 ---help---
Samuel Thibaultddb0c5a2010-08-21 21:32:41 +0200774 Enable maximum number of CPUS and NUMA Nodes for this architecture.
Mike Travis1184dc22008-05-12 21:21:12 +0200775 If unsure, say N.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100776
777config NR_CPUS
Mike Travis36f51012008-12-16 17:33:51 -0800778 int "Maximum number of CPUs" if SMP && !MAXSMP
Michael K. Johnson2a3313f2009-04-21 21:44:48 -0400779 range 2 8 if SMP && X86_32 && !X86_BIGSMP
Mike Travis36f51012008-12-16 17:33:51 -0800780 range 2 512 if SMP && !MAXSMP
Mike Travis78637a972008-12-16 17:34:00 -0800781 default "1" if !SMP
Linus Torvaldsd25e26b2008-08-25 14:15:38 -0700782 default "4096" if MAXSMP
Mike Travis78637a972008-12-16 17:34:00 -0800783 default "32" if SMP && (X86_NUMAQ || X86_SUMMIT || X86_BIGSMP || X86_ES7000)
784 default "8" if SMP
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100785 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100786 This allows you to specify the maximum number of CPUs which this
Linus Torvaldsd25e26b2008-08-25 14:15:38 -0700787 kernel will support. The maximum supported value is 512 and the
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100788 minimum value which makes sense is 2.
789
790 This is purely to save memory - each supported CPU adds
791 approximately eight kilobytes to the kernel image.
792
793config SCHED_SMT
794 bool "SMT (Hyperthreading) scheduler support"
Hiroshi Shimamotob089c122008-02-27 13:16:30 -0800795 depends on X86_HT
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100796 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100797 SMT scheduler support improves the CPU scheduler's decision making
798 when dealing with Intel Pentium 4 chips with HyperThreading at a
799 cost of slightly increased overhead in some places. If unsure say
800 N here.
801
802config SCHED_MC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100803 def_bool y
804 prompt "Multi-core scheduler support"
Hiroshi Shimamotob089c122008-02-27 13:16:30 -0800805 depends on X86_HT
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100806 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100807 Multi-core scheduler support improves the CPU scheduler's decision
808 making when dealing with multi-core CPU chips at a cost of slightly
809 increased overhead in some places. If unsure say N here.
810
811source "kernel/Kconfig.preempt"
812
813config X86_UP_APIC
814 bool "Local APIC support on uniprocessors"
Ingo Molnare0c7ae32009-01-27 18:43:09 +0100815 depends on X86_32 && !SMP && !X86_32_NON_STANDARD
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100816 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100817 A local APIC (Advanced Programmable Interrupt Controller) is an
818 integrated interrupt controller in the CPU. If you have a single-CPU
819 system which has a processor with a local APIC, you can say Y here to
820 enable and use it. If you say Y here even though your machine doesn't
821 have a local APIC, then the kernel will still run with no slowdown at
822 all. The local APIC supports CPU-generated self-interrupts (timer,
823 performance counters), and the NMI watchdog which detects hard
824 lockups.
825
826config X86_UP_IOAPIC
827 bool "IO-APIC support on uniprocessors"
828 depends on X86_UP_APIC
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100829 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100830 An IO-APIC (I/O Advanced Programmable Interrupt Controller) is an
831 SMP-capable replacement for PC-style interrupt controllers. Most
832 SMP systems and many recent uniprocessor systems have one.
833
834 If you have a single-CPU system with an IO-APIC, you can say Y here
835 to use it. If you say Y here even though your machine doesn't have
836 an IO-APIC, then the kernel will still run with no slowdown at all.
837
838config X86_LOCAL_APIC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100839 def_bool y
Ingo Molnare0c7ae32009-01-27 18:43:09 +0100840 depends on X86_64 || SMP || X86_32_NON_STANDARD || X86_UP_APIC
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100841
842config X86_IO_APIC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100843 def_bool y
Henrik Kretzschmar1444e0c2011-02-22 15:38:07 +0100844 depends on X86_64 || SMP || X86_32_NON_STANDARD || X86_UP_IOAPIC
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100845
846config X86_VISWS_APIC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100847 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100848 depends on X86_32 && X86_VISWS
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100849
Stefan Assmann41b9eb22008-07-15 13:48:55 +0200850config X86_REROUTE_FOR_BROKEN_BOOT_IRQS
851 bool "Reroute for broken boot IRQs"
Stefan Assmann41b9eb22008-07-15 13:48:55 +0200852 depends on X86_IO_APIC
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100853 ---help---
Stefan Assmann41b9eb22008-07-15 13:48:55 +0200854 This option enables a workaround that fixes a source of
855 spurious interrupts. This is recommended when threaded
856 interrupt handling is used on systems where the generation of
857 superfluous "boot interrupts" cannot be disabled.
858
859 Some chipsets generate a legacy INTx "boot IRQ" when the IRQ
860 entry in the chipset's IO-APIC is masked (as, e.g. the RT
861 kernel does during interrupt handling). On chipsets where this
862 boot IRQ generation cannot be disabled, this workaround keeps
863 the original IRQ line masked so that only the equivalent "boot
864 IRQ" is delivered to the CPUs. The workaround also tells the
865 kernel to set up the IRQ handler on the boot IRQ line. In this
866 way only one interrupt is delivered to the kernel. Otherwise
867 the spurious second interrupt may cause the kernel to bring
868 down (vital) interrupt lines.
869
870 Only affects "broken" chipsets. Interrupt sharing may be
871 increased on these systems.
872
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100873config X86_MCE
Andi Kleenbab9bc62009-07-09 00:31:38 +0200874 bool "Machine Check / overheating reporting"
Borislav Petkove57dbaf2011-09-13 15:23:21 +0200875 default y
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100876 ---help---
Andi Kleenbab9bc62009-07-09 00:31:38 +0200877 Machine Check support allows the processor to notify the
878 kernel if it detects a problem (e.g. overheating, data corruption).
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100879 The action the kernel takes depends on the severity of the problem,
Andi Kleenbab9bc62009-07-09 00:31:38 +0200880 ranging from warning messages to halting the machine.
Andi Kleen4efc0672009-04-28 19:07:31 +0200881
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100882config X86_MCE_INTEL
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100883 def_bool y
884 prompt "Intel MCE features"
Andi Kleenc1ebf832009-07-09 00:31:41 +0200885 depends on X86_MCE && X86_LOCAL_APIC
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100886 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100887 Additional support for intel specific MCE features such as
888 the thermal monitor.
889
890config X86_MCE_AMD
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100891 def_bool y
892 prompt "AMD MCE features"
Andi Kleenc1ebf832009-07-09 00:31:41 +0200893 depends on X86_MCE && X86_LOCAL_APIC
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100894 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100895 Additional support for AMD specific MCE features such as
896 the DRAM Error Threshold.
897
Andi Kleen4efc0672009-04-28 19:07:31 +0200898config X86_ANCIENT_MCE
Jan Beulich6fc108a2010-04-21 15:23:44 +0100899 bool "Support for old Pentium 5 / WinChip machine checks"
Andi Kleenc31d9632009-07-09 00:31:37 +0200900 depends on X86_32 && X86_MCE
Hidetoshi Setocd13adcc2009-05-27 16:57:31 +0900901 ---help---
902 Include support for machine check handling on old Pentium 5 or WinChip
903 systems. These typically need to be enabled explicitely on the command
904 line.
Andi Kleen4efc0672009-04-28 19:07:31 +0200905
Andi Kleenb2762682009-02-12 13:49:31 +0100906config X86_MCE_THRESHOLD
907 depends on X86_MCE_AMD || X86_MCE_INTEL
Jan Beulich6fc108a2010-04-21 15:23:44 +0100908 def_bool y
Andi Kleenb2762682009-02-12 13:49:31 +0100909
Andi Kleenea149b32009-04-29 19:31:00 +0200910config X86_MCE_INJECT
Andi Kleenc1ebf832009-07-09 00:31:41 +0200911 depends on X86_MCE
Andi Kleenea149b32009-04-29 19:31:00 +0200912 tristate "Machine check injector support"
913 ---help---
914 Provide support for injecting machine checks for testing purposes.
915 If you don't know what a machine check is and you don't do kernel
916 QA it is safe to say n.
917
Andi Kleen4efc0672009-04-28 19:07:31 +0200918config X86_THERMAL_VECTOR
919 def_bool y
Andi Kleen5bb38ad2009-07-09 00:31:39 +0200920 depends on X86_MCE_INTEL
Andi Kleen4efc0672009-04-28 19:07:31 +0200921
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100922config VM86
David Rientjes6a108a12011-01-20 14:44:16 -0800923 bool "Enable VM86 support" if EXPERT
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100924 default y
925 depends on X86_32
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100926 ---help---
927 This option is required by programs like DOSEMU to run 16-bit legacy
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100928 code on X86 processors. It also may be needed by software like
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100929 XFree86 to initialize some video cards via BIOS. Disabling this
930 option saves about 6k.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100931
932config TOSHIBA
933 tristate "Toshiba Laptop support"
934 depends on X86_32
935 ---help---
936 This adds a driver to safely access the System Management Mode of
937 the CPU on Toshiba portables with a genuine Toshiba BIOS. It does
938 not work on models with a Phoenix BIOS. The System Management Mode
939 is used to set the BIOS and power saving options on Toshiba portables.
940
941 For information on utilities to make use of this driver see the
942 Toshiba Linux utilities web site at:
943 <http://www.buzzard.org.uk/toshiba/>.
944
945 Say Y if you intend to run this kernel on a Toshiba portable.
946 Say N otherwise.
947
948config I8K
949 tristate "Dell laptop support"
Jean Delvare949a9d72011-05-25 20:43:33 +0200950 select HWMON
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100951 ---help---
952 This adds a driver to safely access the System Management Mode
953 of the CPU on the Dell Inspiron 8000. The System Management Mode
954 is used to read cpu temperature and cooling fan status and to
955 control the fans on the I8K portables.
956
957 This driver has been tested only on the Inspiron 8000 but it may
958 also work with other Dell laptops. You can force loading on other
959 models by passing the parameter `force=1' to the module. Use at
960 your own risk.
961
962 For information on utilities to make use of this driver see the
963 I8K Linux utilities web site at:
964 <http://people.debian.org/~dz/i8k/>
965
966 Say Y if you intend to run this kernel on a Dell Inspiron 8000.
967 Say N otherwise.
968
969config X86_REBOOTFIXUPS
Jan Beulich9ba16082008-10-15 22:01:38 -0700970 bool "Enable X86 board specific fixups for reboot"
971 depends on X86_32
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100972 ---help---
973 This enables chipset and/or board specific fixups to be done
974 in order to get reboot to work correctly. This is only needed on
975 some combinations of hardware and BIOS. The symptom, for which
976 this config is intended, is when reboot ends with a stalled/hung
977 system.
978
979 Currently, the only fixup is for the Geode machines using
Florian Fainelli5e3a77e2008-01-30 13:33:36 +0100980 CS5530A and CS5536 chipsets and the RDC R-321x SoC.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100981
982 Say Y if you want to enable the fixup. Currently, it's safe to
983 enable this option even if you don't need it.
984 Say N otherwise.
985
986config MICROCODE
Borislav Petkove43f6e62012-08-01 19:17:01 +0200987 tristate "CPU microcode loading support"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100988 select FW_LOADER
989 ---help---
Borislav Petkove43f6e62012-08-01 19:17:01 +0200990
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100991 If you say Y here, you will be able to update the microcode on
Peter Oruba80cc9f12008-07-28 18:44:22 +0200992 certain Intel and AMD processors. The Intel support is for the
Borislav Petkove43f6e62012-08-01 19:17:01 +0200993 IA32 family, e.g. Pentium Pro, Pentium II, Pentium III, Pentium 4,
994 Xeon etc. The AMD support is for families 0x10 and later. You will
995 obviously need the actual microcode binary data itself which is not
996 shipped with the Linux kernel.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100997
Peter Oruba8d86f392008-07-28 18:44:21 +0200998 This option selects the general module only, you need to select
999 at least one vendor specific module as well.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001000
Borislav Petkove43f6e62012-08-01 19:17:01 +02001001 To compile this driver as a module, choose M here: the module
1002 will be called microcode.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001003
Peter Oruba8d86f392008-07-28 18:44:21 +02001004config MICROCODE_INTEL
Borislav Petkove43f6e62012-08-01 19:17:01 +02001005 bool "Intel microcode loading support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001006 depends on MICROCODE
1007 default MICROCODE
1008 select FW_LOADER
1009 ---help---
1010 This options enables microcode patch loading support for Intel
1011 processors.
Peter Oruba8d86f392008-07-28 18:44:21 +02001012
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001013 For latest news and information on obtaining all the required
1014 Intel ingredients for this driver, check:
1015 <http://www.urbanmyth.org/microcode/>.
Peter Oruba8d86f392008-07-28 18:44:21 +02001016
Peter Oruba80cc9f12008-07-28 18:44:22 +02001017config MICROCODE_AMD
Borislav Petkove43f6e62012-08-01 19:17:01 +02001018 bool "AMD microcode loading support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001019 depends on MICROCODE
1020 select FW_LOADER
1021 ---help---
1022 If you select this option, microcode patch loading support for AMD
1023 processors will be enabled.
Peter Oruba80cc9f12008-07-28 18:44:22 +02001024
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001025config MICROCODE_OLD_INTERFACE
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001026 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001027 depends on MICROCODE
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001028
1029config X86_MSR
1030 tristate "/dev/cpu/*/msr - Model-specific register support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001031 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001032 This device gives privileged processes access to the x86
1033 Model-Specific Registers (MSRs). It is a character device with
1034 major 202 and minors 0 to 31 for /dev/cpu/0/msr to /dev/cpu/31/msr.
1035 MSR accesses are directed to a specific CPU on multi-processor
1036 systems.
1037
1038config X86_CPUID
1039 tristate "/dev/cpu/*/cpuid - CPU information support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001040 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001041 This device gives processes access to the x86 CPUID instruction to
1042 be executed on a specific processor. It is a character device
1043 with major 203 and minors 0 to 31 for /dev/cpu/0/cpuid to
1044 /dev/cpu/31/cpuid.
1045
1046choice
1047 prompt "High Memory Support"
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001048 default HIGHMEM64G if X86_NUMAQ
Jan Beulich6fc108a2010-04-21 15:23:44 +01001049 default HIGHMEM4G
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001050 depends on X86_32
1051
1052config NOHIGHMEM
1053 bool "off"
1054 depends on !X86_NUMAQ
1055 ---help---
1056 Linux can use up to 64 Gigabytes of physical memory on x86 systems.
1057 However, the address space of 32-bit x86 processors is only 4
1058 Gigabytes large. That means that, if you have a large amount of
1059 physical memory, not all of it can be "permanently mapped" by the
1060 kernel. The physical memory that's not permanently mapped is called
1061 "high memory".
1062
1063 If you are compiling a kernel which will never run on a machine with
1064 more than 1 Gigabyte total physical RAM, answer "off" here (default
1065 choice and suitable for most users). This will result in a "3GB/1GB"
1066 split: 3GB are mapped so that each process sees a 3GB virtual memory
1067 space and the remaining part of the 4GB virtual memory space is used
1068 by the kernel to permanently map as much physical memory as
1069 possible.
1070
1071 If the machine has between 1 and 4 Gigabytes physical RAM, then
1072 answer "4GB" here.
1073
1074 If more than 4 Gigabytes is used then answer "64GB" here. This
1075 selection turns Intel PAE (Physical Address Extension) mode on.
1076 PAE implements 3-level paging on IA32 processors. PAE is fully
1077 supported by Linux, PAE mode is implemented on all recent Intel
1078 processors (Pentium Pro and better). NOTE: If you say "64GB" here,
1079 then the kernel will not boot on CPUs that don't support PAE!
1080
1081 The actual amount of total physical memory will either be
1082 auto detected or can be forced by using a kernel command line option
1083 such as "mem=256M". (Try "man bootparam" or see the documentation of
1084 your boot loader (lilo or loadlin) about how to pass options to the
1085 kernel at boot time.)
1086
1087 If unsure, say "off".
1088
1089config HIGHMEM4G
1090 bool "4GB"
1091 depends on !X86_NUMAQ
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001092 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001093 Select this if you have a 32-bit processor and between 1 and 4
1094 gigabytes of physical RAM.
1095
1096config HIGHMEM64G
1097 bool "64GB"
1098 depends on !M386 && !M486
1099 select X86_PAE
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001100 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001101 Select this if you have a 32-bit processor and more than 4
1102 gigabytes of physical RAM.
1103
1104endchoice
1105
1106choice
1107 depends on EXPERIMENTAL
David Rientjes6a108a12011-01-20 14:44:16 -08001108 prompt "Memory split" if EXPERT
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001109 default VMSPLIT_3G
1110 depends on X86_32
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001111 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001112 Select the desired split between kernel and user memory.
1113
1114 If the address range available to the kernel is less than the
1115 physical memory installed, the remaining memory will be available
1116 as "high memory". Accessing high memory is a little more costly
1117 than low memory, as it needs to be mapped into the kernel first.
1118 Note that increasing the kernel address space limits the range
1119 available to user programs, making the address space there
1120 tighter. Selecting anything other than the default 3G/1G split
1121 will also likely make your kernel incompatible with binary-only
1122 kernel modules.
1123
1124 If you are not absolutely sure what you are doing, leave this
1125 option alone!
1126
1127 config VMSPLIT_3G
1128 bool "3G/1G user/kernel split"
1129 config VMSPLIT_3G_OPT
1130 depends on !X86_PAE
1131 bool "3G/1G user/kernel split (for full 1G low memory)"
1132 config VMSPLIT_2G
1133 bool "2G/2G user/kernel split"
1134 config VMSPLIT_2G_OPT
1135 depends on !X86_PAE
1136 bool "2G/2G user/kernel split (for full 2G low memory)"
1137 config VMSPLIT_1G
1138 bool "1G/3G user/kernel split"
1139endchoice
1140
1141config PAGE_OFFSET
1142 hex
1143 default 0xB0000000 if VMSPLIT_3G_OPT
1144 default 0x80000000 if VMSPLIT_2G
1145 default 0x78000000 if VMSPLIT_2G_OPT
1146 default 0x40000000 if VMSPLIT_1G
1147 default 0xC0000000
1148 depends on X86_32
1149
1150config HIGHMEM
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001151 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001152 depends on X86_32 && (HIGHMEM64G || HIGHMEM4G)
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001153
1154config X86_PAE
Jan Beulich9ba16082008-10-15 22:01:38 -07001155 bool "PAE (Physical Address Extension) Support"
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001156 depends on X86_32 && !HIGHMEM4G
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001157 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001158 PAE is required for NX support, and furthermore enables
1159 larger swapspace support for non-overcommit purposes. It
1160 has the cost of more pagetable lookup overhead, and also
1161 consumes more pagetable space per process.
1162
Jeremy Fitzhardinge600715d2008-09-11 01:31:45 -07001163config ARCH_PHYS_ADDR_T_64BIT
Jan Beulich3120e252012-09-10 12:41:45 +01001164 def_bool y
1165 depends on X86_64 || X86_PAE
Jeremy Fitzhardinge600715d2008-09-11 01:31:45 -07001166
FUJITA Tomonori66f2b062010-10-20 15:55:35 -07001167config ARCH_DMA_ADDR_T_64BIT
Jan Beulich3120e252012-09-10 12:41:45 +01001168 def_bool y
1169 depends on X86_64 || HIGHMEM64G
FUJITA Tomonori66f2b062010-10-20 15:55:35 -07001170
Nick Piggin9e899812008-10-22 12:33:16 +02001171config DIRECT_GBPAGES
David Rientjes6a108a12011-01-20 14:44:16 -08001172 bool "Enable 1GB pages for kernel pagetables" if EXPERT
Nick Piggin9e899812008-10-22 12:33:16 +02001173 default y
1174 depends on X86_64
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001175 ---help---
Nick Piggin9e899812008-10-22 12:33:16 +02001176 Allow the kernel linear mapping to use 1GB pages on CPUs that
1177 support it. This can improve the kernel's performance a tiny bit by
1178 reducing TLB pressure. If in doubt, say "Y".
1179
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001180# Common NUMA Features
1181config NUMA
KOSAKI Motohirofd51b2d2008-11-05 02:27:19 +09001182 bool "Numa Memory Allocation and Scheduler Support"
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001183 depends on SMP
Rafael J. Wysocki604d2052008-11-12 23:26:14 +01001184 depends on X86_64 || (X86_32 && HIGHMEM64G && (X86_NUMAQ || X86_BIGSMP || X86_SUMMIT && ACPI) && EXPERIMENTAL)
Yinghai Lu0699eae2008-06-17 15:39:01 -07001185 default y if (X86_NUMAQ || X86_SUMMIT || X86_BIGSMP)
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001186 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001187 Enable NUMA (Non Uniform Memory Access) support.
KOSAKI Motohirofd51b2d2008-11-05 02:27:19 +09001188
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001189 The kernel will try to allocate memory used by a CPU on the
1190 local memory controller of the CPU and add some more
1191 NUMA awareness to the kernel.
1192
Ingo Molnarc280ea52008-11-08 13:29:45 +01001193 For 64-bit this is recommended if the system is Intel Core i7
KOSAKI Motohirofd51b2d2008-11-05 02:27:19 +09001194 (or later), AMD Opteron, or EM64T NUMA.
1195
1196 For 32-bit this is only needed on (rare) 32-bit-only platforms
1197 that support NUMA topologies, such as NUMAQ / Summit, or if you
1198 boot a 32-bit kernel on a 64-bit NUMA platform.
1199
1200 Otherwise, you should say N.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001201
1202comment "NUMA (Summit) requires SMP, 64GB highmem support, ACPI"
1203 depends on X86_32 && X86_SUMMIT && (!HIGHMEM64G || !ACPI)
1204
Hans Rosenfeldeec1d4f2010-10-29 17:14:30 +02001205config AMD_NUMA
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001206 def_bool y
1207 prompt "Old style AMD Opteron NUMA detection"
Tejun Heo5da0ef92011-07-11 10:34:32 +02001208 depends on X86_64 && NUMA && PCI
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001209 ---help---
Hans Rosenfeldeec1d4f2010-10-29 17:14:30 +02001210 Enable AMD NUMA node topology detection. You should say Y here if
1211 you have a multi processor AMD system. This uses an old method to
1212 read the NUMA configuration directly from the builtin Northbridge
1213 of Opteron. It is recommended to use X86_64_ACPI_NUMA instead,
1214 which also takes priority if both are compiled in.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001215
1216config X86_64_ACPI_NUMA
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001217 def_bool y
1218 prompt "ACPI NUMA detection"
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001219 depends on X86_64 && NUMA && ACPI && PCI
1220 select ACPI_NUMA
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001221 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001222 Enable ACPI SRAT based node topology detection.
1223
Suresh Siddha6ec6e0d2008-03-25 10:14:35 -07001224# Some NUMA nodes have memory ranges that span
1225# other nodes. Even though a pfn is valid and
1226# between a node's start and end pfns, it may not
1227# reside on that node. See memmap_init_zone()
1228# for details.
1229config NODES_SPAN_OTHER_NODES
1230 def_bool y
1231 depends on X86_64_ACPI_NUMA
1232
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001233config NUMA_EMU
1234 bool "NUMA emulation"
Tejun Heo1b7e03e2011-05-02 17:24:48 +02001235 depends on NUMA
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001236 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001237 Enable NUMA emulation. A flat machine will be split
1238 into virtual nodes when booted with "numa=fake=N", where N is the
1239 number of nodes. This is only useful for debugging.
1240
1241config NODES_SHIFT
Linus Torvaldsd25e26b2008-08-25 14:15:38 -07001242 int "Maximum NUMA Nodes (as a power of 2)" if !MAXSMP
David Rientjes51591e32010-03-25 15:39:27 -07001243 range 1 10
1244 default "10" if MAXSMP
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001245 default "6" if X86_64
1246 default "4" if X86_NUMAQ
1247 default "3"
1248 depends on NEED_MULTIPLE_NODES
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001249 ---help---
Mike Travis1184dc22008-05-12 21:21:12 +02001250 Specify the maximum number of NUMA Nodes available on the target
Matt LaPlante692105b2009-01-26 11:12:25 +01001251 system. Increases memory reserved to accommodate various tables.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001252
Tejun Heo3b166512011-04-01 11:15:12 +02001253config HAVE_ARCH_ALLOC_REMAP
1254 def_bool y
1255 depends on X86_32 && NUMA
1256
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001257config ARCH_HAVE_MEMORY_PRESENT
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001258 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001259 depends on X86_32 && DISCONTIGMEM
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001260
1261config NEED_NODE_MEMMAP_SIZE
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001262 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001263 depends on X86_32 && (DISCONTIGMEM || SPARSEMEM)
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001264
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001265config ARCH_FLATMEM_ENABLE
1266 def_bool y
Tejun Heo3b166512011-04-01 11:15:12 +02001267 depends on X86_32 && !NUMA
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001268
1269config ARCH_DISCONTIGMEM_ENABLE
1270 def_bool y
Christoph Lameterb2632952008-01-30 13:30:47 +01001271 depends on NUMA && X86_32
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001272
1273config ARCH_DISCONTIGMEM_DEFAULT
1274 def_bool y
Christoph Lameterb2632952008-01-30 13:30:47 +01001275 depends on NUMA && X86_32
1276
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001277config ARCH_SPARSEMEM_ENABLE
1278 def_bool y
Yinghai Lu4272ebf2009-01-29 15:14:46 -08001279 depends on X86_64 || NUMA || (EXPERIMENTAL && X86_32) || X86_32_NON_STANDARD
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001280 select SPARSEMEM_STATIC if X86_32
1281 select SPARSEMEM_VMEMMAP_ENABLE if X86_64
1282
Tejun Heo3b166512011-04-01 11:15:12 +02001283config ARCH_SPARSEMEM_DEFAULT
1284 def_bool y
1285 depends on X86_64
1286
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001287config ARCH_SELECT_MEMORY_MODEL
1288 def_bool y
Christoph Lameterb2632952008-01-30 13:30:47 +01001289 depends on ARCH_SPARSEMEM_ENABLE
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001290
1291config ARCH_MEMORY_PROBE
Jan Beulich3120e252012-09-10 12:41:45 +01001292 def_bool y
1293 depends on X86_64 && MEMORY_HOTPLUG
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001294
Tejun Heo3b166512011-04-01 11:15:12 +02001295config ARCH_PROC_KCORE_TEXT
1296 def_bool y
1297 depends on X86_64 && PROC_KCORE
1298
Avi Kivitya29815a2010-01-10 16:28:09 +02001299config ILLEGAL_POINTER_VALUE
1300 hex
1301 default 0 if X86_32
1302 default 0xdead000000000000 if X86_64
1303
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001304source "mm/Kconfig"
1305
1306config HIGHPTE
1307 bool "Allocate 3rd-level pagetables from highmem"
Jan Beulich6fc108a2010-04-21 15:23:44 +01001308 depends on HIGHMEM
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001309 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001310 The VM uses one page table entry for each page of physical memory.
1311 For systems with a lot of RAM, this can be wasteful of precious
1312 low memory. Setting this option will put user-space page table
1313 entries in high memory.
1314
Jeremy Fitzhardinge9f077872008-09-07 01:51:34 -07001315config X86_CHECK_BIOS_CORRUPTION
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001316 bool "Check for low memory corruption"
1317 ---help---
1318 Periodically check for memory corruption in low memory, which
1319 is suspected to be caused by BIOS. Even when enabled in the
1320 configuration, it is disabled at runtime. Enable it by
1321 setting "memory_corruption_check=1" on the kernel command
1322 line. By default it scans the low 64k of memory every 60
1323 seconds; see the memory_corruption_check_size and
1324 memory_corruption_check_period parameters in
1325 Documentation/kernel-parameters.txt to adjust this.
Jeremy Fitzhardinge9f077872008-09-07 01:51:34 -07001326
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001327 When enabled with the default parameters, this option has
1328 almost no overhead, as it reserves a relatively small amount
1329 of memory and scans it infrequently. It both detects corruption
1330 and prevents it from affecting the running system.
Jeremy Fitzhardinge9f077872008-09-07 01:51:34 -07001331
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001332 It is, however, intended as a diagnostic tool; if repeatable
1333 BIOS-originated corruption always affects the same memory,
1334 you can use memmap= to prevent the kernel from using that
1335 memory.
Jeremy Fitzhardinge9f077872008-09-07 01:51:34 -07001336
Jeremy Fitzhardingec885df52008-09-07 02:37:32 -07001337config X86_BOOTPARAM_MEMORY_CORRUPTION_CHECK
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001338 bool "Set the default setting of memory_corruption_check"
Jeremy Fitzhardingec885df52008-09-07 02:37:32 -07001339 depends on X86_CHECK_BIOS_CORRUPTION
1340 default y
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001341 ---help---
1342 Set whether the default state of memory_corruption_check is
1343 on or off.
Jeremy Fitzhardingec885df52008-09-07 02:37:32 -07001344
H. Peter Anvin9ea77bd2010-08-25 16:38:20 -07001345config X86_RESERVE_LOW
H. Peter Anvind0cd7422010-08-24 17:32:04 -07001346 int "Amount of low memory, in kilobytes, to reserve for the BIOS"
1347 default 64
1348 range 4 640
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001349 ---help---
H. Peter Anvind0cd7422010-08-24 17:32:04 -07001350 Specify the amount of low memory to reserve for the BIOS.
Ingo Molnarfc381512008-09-16 10:07:34 +02001351
H. Peter Anvind0cd7422010-08-24 17:32:04 -07001352 The first page contains BIOS data structures that the kernel
1353 must not use, so that page must always be reserved.
Ingo Molnarfc381512008-09-16 10:07:34 +02001354
H. Peter Anvind0cd7422010-08-24 17:32:04 -07001355 By default we reserve the first 64K of physical RAM, as a
1356 number of BIOSes are known to corrupt that memory range
1357 during events such as suspend/resume or monitor cable
1358 insertion, so it must not be used by the kernel.
Ingo Molnarfc381512008-09-16 10:07:34 +02001359
H. Peter Anvind0cd7422010-08-24 17:32:04 -07001360 You can set this to 4 if you are absolutely sure that you
1361 trust the BIOS to get all its memory reservations and usages
1362 right. If you know your BIOS have problems beyond the
1363 default 64K area, you can set this to 640 to avoid using the
1364 entire low memory range.
1365
1366 If you have doubts about the BIOS (e.g. suspend/resume does
1367 not work or there's kernel crashes after certain hardware
1368 hotplug events) then you might want to enable
1369 X86_CHECK_BIOS_CORRUPTION=y to allow the kernel to check
1370 typical corruption patterns.
1371
1372 Leave this to the default value of 64 if you are unsure.
Ingo Molnarfc381512008-09-16 10:07:34 +02001373
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001374config MATH_EMULATION
1375 bool
1376 prompt "Math emulation" if X86_32
1377 ---help---
1378 Linux can emulate a math coprocessor (used for floating point
1379 operations) if you don't have one. 486DX and Pentium processors have
1380 a math coprocessor built in, 486SX and 386 do not, unless you added
1381 a 487DX or 387, respectively. (The messages during boot time can
1382 give you some hints here ["man dmesg"].) Everyone needs either a
1383 coprocessor or this emulation.
1384
1385 If you don't have a math coprocessor, you need to say Y here; if you
1386 say Y here even though you have a coprocessor, the coprocessor will
1387 be used nevertheless. (This behavior can be changed with the kernel
1388 command line option "no387", which comes handy if your coprocessor
1389 is broken. Try "man bootparam" or see the documentation of your boot
1390 loader (lilo or loadlin) about how to pass options to the kernel at
1391 boot time.) This means that it is a good idea to say Y here if you
1392 intend to use this kernel on different machines.
1393
1394 More information about the internals of the Linux math coprocessor
1395 emulation can be found in <file:arch/x86/math-emu/README>.
1396
1397 If you are not sure, say Y; apart from resulting in a 66 KB bigger
1398 kernel, it won't hurt.
1399
1400config MTRR
Jan Beulich6fc108a2010-04-21 15:23:44 +01001401 def_bool y
David Rientjes6a108a12011-01-20 14:44:16 -08001402 prompt "MTRR (Memory Type Range Register) support" if EXPERT
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001403 ---help---
1404 On Intel P6 family processors (Pentium Pro, Pentium II and later)
1405 the Memory Type Range Registers (MTRRs) may be used to control
1406 processor access to memory ranges. This is most useful if you have
1407 a video (VGA) card on a PCI or AGP bus. Enabling write-combining
1408 allows bus write transfers to be combined into a larger transfer
1409 before bursting over the PCI/AGP bus. This can increase performance
1410 of image write operations 2.5 times or more. Saying Y here creates a
1411 /proc/mtrr file which may be used to manipulate your processor's
1412 MTRRs. Typically the X server should use this.
1413
1414 This code has a reasonably generic interface so that similar
1415 control registers on other processors can be easily supported
1416 as well:
1417
1418 The Cyrix 6x86, 6x86MX and M II processors have Address Range
1419 Registers (ARRs) which provide a similar functionality to MTRRs. For
1420 these, the ARRs are used to emulate the MTRRs.
1421 The AMD K6-2 (stepping 8 and above) and K6-3 processors have two
1422 MTRRs. The Centaur C6 (WinChip) has 8 MCRs, allowing
1423 write-combining. All of these processors are supported by this code
1424 and it makes sense to say Y here if you have one of them.
1425
1426 Saying Y here also fixes a problem with buggy SMP BIOSes which only
1427 set the MTRRs for the boot CPU and not for the secondary CPUs. This
1428 can lead to all sorts of problems, so it's good to say Y here.
1429
1430 You can safely say Y even if your machine doesn't have MTRRs, you'll
1431 just add about 9 KB to your kernel.
1432
Randy Dunlap7225e752008-07-26 17:54:22 -07001433 See <file:Documentation/x86/mtrr.txt> for more information.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001434
Yinghai Lu95ffa242008-04-29 03:52:33 -07001435config MTRR_SANITIZER
Yinghai Lu2ffb3502008-09-30 16:29:40 -07001436 def_bool y
Yinghai Lu95ffa242008-04-29 03:52:33 -07001437 prompt "MTRR cleanup support"
1438 depends on MTRR
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001439 ---help---
Thomas Gleixneraba37282008-07-15 14:48:48 +02001440 Convert MTRR layout from continuous to discrete, so X drivers can
1441 add writeback entries.
Yinghai Lu95ffa242008-04-29 03:52:33 -07001442
Thomas Gleixneraba37282008-07-15 14:48:48 +02001443 Can be disabled with disable_mtrr_cleanup on the kernel command line.
Matt LaPlante692105b2009-01-26 11:12:25 +01001444 The largest mtrr entry size for a continuous block can be set with
Thomas Gleixneraba37282008-07-15 14:48:48 +02001445 mtrr_chunk_size.
Yinghai Lu95ffa242008-04-29 03:52:33 -07001446
Yinghai Lu2ffb3502008-09-30 16:29:40 -07001447 If unsure, say Y.
Yinghai Lu95ffa242008-04-29 03:52:33 -07001448
1449config MTRR_SANITIZER_ENABLE_DEFAULT
Yinghai Luf5098d62008-04-29 20:25:58 -07001450 int "MTRR cleanup enable value (0-1)"
1451 range 0 1
1452 default "0"
Yinghai Lu95ffa242008-04-29 03:52:33 -07001453 depends on MTRR_SANITIZER
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001454 ---help---
Yinghai Luf5098d62008-04-29 20:25:58 -07001455 Enable mtrr cleanup default value
Yinghai Lu95ffa242008-04-29 03:52:33 -07001456
Yinghai Lu12031a62008-05-02 02:40:22 -07001457config MTRR_SANITIZER_SPARE_REG_NR_DEFAULT
1458 int "MTRR cleanup spare reg num (0-7)"
1459 range 0 7
1460 default "1"
1461 depends on MTRR_SANITIZER
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001462 ---help---
Yinghai Lu12031a62008-05-02 02:40:22 -07001463 mtrr cleanup spare entries default, it can be changed via
Thomas Gleixneraba37282008-07-15 14:48:48 +02001464 mtrr_spare_reg_nr=N on the kernel command line.
Yinghai Lu12031a62008-05-02 02:40:22 -07001465
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001466config X86_PAT
Jan Beulich6fc108a2010-04-21 15:23:44 +01001467 def_bool y
David Rientjes6a108a12011-01-20 14:44:16 -08001468 prompt "x86 PAT support" if EXPERT
Ingo Molnar2a8a2712008-04-26 10:26:52 +02001469 depends on MTRR
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001470 ---help---
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001471 Use PAT attributes to setup page level cache control.
Venki Pallipadi042b78e2008-03-24 14:22:35 -07001472
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001473 PATs are the modern equivalents of MTRRs and are much more
1474 flexible than MTRRs.
1475
1476 Say N here if you see bootup problems (boot crash, boot hang,
Venki Pallipadi042b78e2008-03-24 14:22:35 -07001477 spontaneous reboots) or a non-working video driver.
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001478
1479 If unsure, say Y.
1480
Venkatesh Pallipadi46cf98c2009-07-10 09:57:37 -07001481config ARCH_USES_PG_UNCACHED
1482 def_bool y
1483 depends on X86_PAT
1484
H. Peter Anvin628c6242011-07-31 13:59:29 -07001485config ARCH_RANDOM
1486 def_bool y
1487 prompt "x86 architectural random number generator" if EXPERT
1488 ---help---
1489 Enable the x86 architectural RDRAND instruction
1490 (Intel Bull Mountain technology) to generate random numbers.
1491 If supported, this is a high bandwidth, cryptographically
1492 secure hardware random number generator.
1493
H. Peter Anvin51ae4a22012-09-21 12:43:10 -07001494config X86_SMAP
1495 def_bool y
1496 prompt "Supervisor Mode Access Prevention" if EXPERT
1497 ---help---
1498 Supervisor Mode Access Prevention (SMAP) is a security
1499 feature in newer Intel processors. There is a small
1500 performance cost if this enabled and turned on; there is
1501 also a small increase in the kernel size if this is enabled.
1502
1503 If unsure, say Y.
1504
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001505config EFI
Jan Beulich9ba16082008-10-15 22:01:38 -07001506 bool "EFI runtime service support"
Huang, Ying5b836832008-01-30 13:31:19 +01001507 depends on ACPI
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001508 ---help---
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001509 This enables the kernel to use EFI runtime services that are
1510 available (such as the EFI variable services).
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001511
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001512 This option is only useful on systems that have EFI firmware.
1513 In addition, you should use the latest ELILO loader available
1514 at <http://elilo.sourceforge.net> in order to take advantage
1515 of EFI runtime services. However, even with this option, the
1516 resultant kernel should continue to boot on existing non-EFI
1517 platforms.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001518
Matt Fleming291f3632011-12-12 21:27:52 +00001519config EFI_STUB
1520 bool "EFI stub support"
1521 depends on EFI
1522 ---help---
1523 This kernel feature allows a bzImage to be loaded directly
1524 by EFI firmware without the use of a bootloader.
1525
Matt Fleming0c759662012-03-16 12:03:13 +00001526 See Documentation/x86/efi-stub.txt for more information.
1527
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001528config SECCOMP
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001529 def_bool y
1530 prompt "Enable seccomp to safely compute untrusted bytecode"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001531 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001532 This kernel feature is useful for number crunching applications
1533 that may need to compute untrusted bytecode during their
1534 execution. By using pipes or other transports made available to
1535 the process as file descriptors supporting the read/write
1536 syscalls, it's possible to isolate those applications in
1537 their own address space using seccomp. Once seccomp is
Alexey Dobriyan9c0bbee2008-09-09 11:01:31 +04001538 enabled via prctl(PR_SET_SECCOMP), it cannot be disabled
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001539 and the task is only allowed to execute a few safe syscalls
1540 defined by each seccomp mode.
1541
1542 If unsure, say Y. Only embedded should say N here.
1543
1544config CC_STACKPROTECTOR
Jean Delvare2a8ac742012-07-06 16:08:25 +02001545 bool "Enable -fstack-protector buffer overflow detection"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001546 ---help---
1547 This option turns on the -fstack-protector GCC feature. This
Ingo Molnar113c5412008-02-14 10:36:03 +01001548 feature puts, at the beginning of functions, a canary value on
1549 the stack just before the return address, and validates
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001550 the value just before actually returning. Stack based buffer
1551 overflows (that need to overwrite this return address) now also
1552 overwrite the canary, which gets detected and the attack is then
1553 neutralized via a kernel panic.
1554
1555 This feature requires gcc version 4.2 or above, or a distribution
1556 gcc with the feature backported. Older versions are automatically
Ingo Molnar113c5412008-02-14 10:36:03 +01001557 detected and for those versions, this configuration option is
1558 ignored. (and a warning is printed during bootup)
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001559
1560source kernel/Kconfig.hz
1561
1562config KEXEC
1563 bool "kexec system call"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001564 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001565 kexec is a system call that implements the ability to shutdown your
1566 current kernel, and to start another kernel. It is like a reboot
1567 but it is independent of the system firmware. And like a reboot
1568 you can start any kernel with it, not just Linux.
1569
1570 The name comes from the similarity to the exec system call.
1571
1572 It is an ongoing process to be certain the hardware in a machine
1573 is properly shutdown, so do not be surprised if this code does not
1574 initially work for you. It may help to enable device hotplugging
1575 support. As of this writing the exact hardware interface is
1576 strongly in flux, so no good recommendation can be made.
1577
1578config CRASH_DUMP
Pavel Machek04b69442008-08-14 17:16:50 +02001579 bool "kernel crash dumps"
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001580 depends on X86_64 || (X86_32 && HIGHMEM)
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001581 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001582 Generate crash dump after being started by kexec.
1583 This should be normally only set in special crash dump kernels
1584 which are loaded in the main kernel with kexec-tools into
1585 a specially reserved region and then later executed after
1586 a crash by kdump/kexec. The crash dump kernel must be compiled
1587 to a memory address not used by the main kernel or BIOS using
1588 PHYSICAL_START, or it must be built as a relocatable image
1589 (CONFIG_RELOCATABLE=y).
1590 For more details see Documentation/kdump/kdump.txt
1591
Huang Ying3ab83522008-07-25 19:45:07 -07001592config KEXEC_JUMP
1593 bool "kexec jump (EXPERIMENTAL)"
1594 depends on EXPERIMENTAL
Huang Yingfee7b0d2009-03-10 10:57:16 +08001595 depends on KEXEC && HIBERNATION
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001596 ---help---
Huang Ying89081d12008-07-25 19:45:10 -07001597 Jump between original kernel and kexeced kernel and invoke
1598 code in physical address mode via KEXEC
Huang Ying3ab83522008-07-25 19:45:07 -07001599
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001600config PHYSICAL_START
David Rientjes6a108a12011-01-20 14:44:16 -08001601 hex "Physical address where the kernel is loaded" if (EXPERT || CRASH_DUMP)
H. Peter Anvinceefccc2009-05-11 16:12:16 -07001602 default "0x1000000"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001603 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001604 This gives the physical address where the kernel is loaded.
1605
1606 If kernel is a not relocatable (CONFIG_RELOCATABLE=n) then
1607 bzImage will decompress itself to above physical address and
1608 run from there. Otherwise, bzImage will run from the address where
1609 it has been loaded by the boot loader and will ignore above physical
1610 address.
1611
1612 In normal kdump cases one does not have to set/change this option
1613 as now bzImage can be compiled as a completely relocatable image
1614 (CONFIG_RELOCATABLE=y) and be used to load and run from a different
1615 address. This option is mainly useful for the folks who don't want
1616 to use a bzImage for capturing the crash dump and want to use a
1617 vmlinux instead. vmlinux is not relocatable hence a kernel needs
1618 to be specifically compiled to run from a specific memory area
1619 (normally a reserved region) and this option comes handy.
1620
H. Peter Anvinceefccc2009-05-11 16:12:16 -07001621 So if you are using bzImage for capturing the crash dump,
1622 leave the value here unchanged to 0x1000000 and set
1623 CONFIG_RELOCATABLE=y. Otherwise if you plan to use vmlinux
1624 for capturing the crash dump change this value to start of
1625 the reserved region. In other words, it can be set based on
1626 the "X" value as specified in the "crashkernel=YM@XM"
1627 command line boot parameter passed to the panic-ed
1628 kernel. Please take a look at Documentation/kdump/kdump.txt
1629 for more details about crash dumps.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001630
1631 Usage of bzImage for capturing the crash dump is recommended as
1632 one does not have to build two kernels. Same kernel can be used
1633 as production kernel and capture kernel. Above option should have
1634 gone away after relocatable bzImage support is introduced. But it
1635 is present because there are users out there who continue to use
1636 vmlinux for dump capture. This option should go away down the
1637 line.
1638
1639 Don't change this unless you know what you are doing.
1640
1641config RELOCATABLE
H. Peter Anvin26717802009-05-07 14:19:34 -07001642 bool "Build a relocatable kernel"
1643 default y
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001644 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001645 This builds a kernel image that retains relocation information
1646 so it can be loaded someplace besides the default 1MB.
1647 The relocations tend to make the kernel binary about 10% larger,
1648 but are discarded at runtime.
1649
1650 One use is for the kexec on panic case where the recovery kernel
1651 must live at a different physical address than the primary
1652 kernel.
1653
1654 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
1655 it has been loaded at and the compile time physical address
1656 (CONFIG_PHYSICAL_START) is ignored.
1657
H. Peter Anvin845adf72009-05-05 21:20:51 -07001658# Relocation on x86-32 needs some additional build support
1659config X86_NEED_RELOCS
1660 def_bool y
1661 depends on X86_32 && RELOCATABLE
1662
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001663config PHYSICAL_ALIGN
Jan Beulich6fc108a2010-04-21 15:23:44 +01001664 hex "Alignment value to which kernel should be aligned" if X86_32
H. Peter Anvinceefccc2009-05-11 16:12:16 -07001665 default "0x1000000"
1666 range 0x2000 0x1000000
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001667 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001668 This value puts the alignment restrictions on physical address
1669 where kernel is loaded and run from. Kernel is compiled for an
1670 address which meets above alignment restriction.
1671
1672 If bootloader loads the kernel at a non-aligned address and
1673 CONFIG_RELOCATABLE is set, kernel will move itself to nearest
1674 address aligned to above value and run from there.
1675
1676 If bootloader loads the kernel at a non-aligned address and
1677 CONFIG_RELOCATABLE is not set, kernel will ignore the run time
1678 load address and decompress itself to the address it has been
1679 compiled for and run from there. The address for which kernel is
1680 compiled already meets above alignment restrictions. Hence the
1681 end result is that kernel runs from a physical address meeting
1682 above alignment restrictions.
1683
1684 Don't change this unless you know what you are doing.
1685
1686config HOTPLUG_CPU
Dimitri Sivanich7c13e6a2008-08-11 10:46:46 -05001687 bool "Support for hot-pluggable CPUs"
Ingo Molnar4b19ed912009-01-27 17:47:24 +01001688 depends on SMP && HOTPLUG
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001689 ---help---
Dimitri Sivanich7c13e6a2008-08-11 10:46:46 -05001690 Say Y here to allow turning CPUs off and on. CPUs can be
1691 controlled through /sys/devices/system/cpu.
1692 ( Note: power management support will enable this option
1693 automatically on SMP systems. )
1694 Say N if you want to disable CPU hotplug.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001695
1696config COMPAT_VDSO
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001697 def_bool y
1698 prompt "Compat VDSO support"
Roland McGrathaf65d642008-01-30 13:30:43 +01001699 depends on X86_32 || IA32_EMULATION
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001700 ---help---
Roland McGrathaf65d642008-01-30 13:30:43 +01001701 Map the 32-bit VDSO to the predictable old-style address too.
Randy Dunlape84446d2009-11-10 15:46:52 -08001702
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001703 Say N here if you are running a sufficiently recent glibc
1704 version (2.3.3 or later), to remove the high-mapped
1705 VDSO mapping and to exclusively use the randomized VDSO.
1706
1707 If unsure, say Y.
1708
Tim Bird516cbf32008-08-12 12:52:36 -07001709config CMDLINE_BOOL
1710 bool "Built-in kernel command line"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001711 ---help---
Tim Bird516cbf32008-08-12 12:52:36 -07001712 Allow for specifying boot arguments to the kernel at
1713 build time. On some systems (e.g. embedded ones), it is
1714 necessary or convenient to provide some or all of the
1715 kernel boot arguments with the kernel itself (that is,
1716 to not rely on the boot loader to provide them.)
1717
1718 To compile command line arguments into the kernel,
1719 set this option to 'Y', then fill in the
1720 the boot arguments in CONFIG_CMDLINE.
1721
1722 Systems with fully functional boot loaders (i.e. non-embedded)
1723 should leave this option set to 'N'.
1724
1725config CMDLINE
1726 string "Built-in kernel command string"
1727 depends on CMDLINE_BOOL
1728 default ""
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001729 ---help---
Tim Bird516cbf32008-08-12 12:52:36 -07001730 Enter arguments here that should be compiled into the kernel
1731 image and used at boot time. If the boot loader provides a
1732 command line at boot time, it is appended to this string to
1733 form the full kernel command line, when the system boots.
1734
1735 However, you can use the CONFIG_CMDLINE_OVERRIDE option to
1736 change this behavior.
1737
1738 In most cases, the command line (whether built-in or provided
1739 by the boot loader) should specify the device for the root
1740 file system.
1741
1742config CMDLINE_OVERRIDE
1743 bool "Built-in command line overrides boot loader arguments"
Tim Bird516cbf32008-08-12 12:52:36 -07001744 depends on CMDLINE_BOOL
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001745 ---help---
Tim Bird516cbf32008-08-12 12:52:36 -07001746 Set this option to 'Y' to have the kernel ignore the boot loader
1747 command line, and use ONLY the built-in command line.
1748
1749 This is used to work around broken boot loaders. This should
1750 be set to 'N' under normal conditions.
1751
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001752endmenu
1753
1754config ARCH_ENABLE_MEMORY_HOTPLUG
1755 def_bool y
1756 depends on X86_64 || (X86_32 && HIGHMEM)
1757
Gary Hade35551052008-10-31 10:52:03 -07001758config ARCH_ENABLE_MEMORY_HOTREMOVE
1759 def_bool y
1760 depends on MEMORY_HOTPLUG
1761
Lee Schermerhorne534c7c2010-05-26 14:44:58 -07001762config USE_PERCPU_NUMA_NODE_ID
Tejun Heo645a7912011-01-23 14:37:40 +01001763 def_bool y
Lee Schermerhorne534c7c2010-05-26 14:44:58 -07001764 depends on NUMA
1765
Bjorn Helgaasda85f862008-11-05 13:37:27 -06001766menu "Power management and ACPI options"
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001767
1768config ARCH_HIBERNATION_HEADER
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001769 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001770 depends on X86_64 && HIBERNATION
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001771
1772source "kernel/power/Kconfig"
1773
1774source "drivers/acpi/Kconfig"
1775
Feng Tangefafc8b2009-08-14 15:23:29 -04001776source "drivers/sfi/Kconfig"
1777
Andi Kleena6b68072008-01-30 13:32:49 +01001778config X86_APM_BOOT
Jan Beulich6fc108a2010-04-21 15:23:44 +01001779 def_bool y
Paul Bolle282e5aa2011-11-17 11:41:31 +01001780 depends on APM
Andi Kleena6b68072008-01-30 13:32:49 +01001781
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001782menuconfig APM
1783 tristate "APM (Advanced Power Management) BIOS support"
Ingo Molnarefefa6f2008-07-10 16:09:50 +02001784 depends on X86_32 && PM_SLEEP
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001785 ---help---
1786 APM is a BIOS specification for saving power using several different
1787 techniques. This is mostly useful for battery powered laptops with
1788 APM compliant BIOSes. If you say Y here, the system time will be
1789 reset after a RESUME operation, the /proc/apm device will provide
1790 battery status information, and user-space programs will receive
1791 notification of APM "events" (e.g. battery status change).
1792
1793 If you select "Y" here, you can disable actual use of the APM
1794 BIOS by passing the "apm=off" option to the kernel at boot time.
1795
1796 Note that the APM support is almost completely disabled for
1797 machines with more than one CPU.
1798
1799 In order to use APM, you will need supporting software. For location
Michael Witten2dc98fd2011-07-08 21:11:16 +00001800 and more information, read <file:Documentation/power/apm-acpi.txt>
1801 and the Battery Powered Linux mini-HOWTO, available from
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001802 <http://www.tldp.org/docs.html#howto>.
1803
1804 This driver does not spin down disk drives (see the hdparm(8)
1805 manpage ("man 8 hdparm") for that), and it doesn't turn off
1806 VESA-compliant "green" monitors.
1807
1808 This driver does not support the TI 4000M TravelMate and the ACER
1809 486/DX4/75 because they don't have compliant BIOSes. Many "green"
1810 desktop machines also don't have compliant BIOSes, and this driver
1811 may cause those machines to panic during the boot phase.
1812
1813 Generally, if you don't have a battery in your machine, there isn't
1814 much point in using this driver and you should say N. If you get
1815 random kernel OOPSes or reboots that don't seem to be related to
1816 anything, try disabling/enabling this option (or disabling/enabling
1817 APM in your BIOS).
1818
1819 Some other things you should try when experiencing seemingly random,
1820 "weird" problems:
1821
1822 1) make sure that you have enough swap space and that it is
1823 enabled.
1824 2) pass the "no-hlt" option to the kernel
1825 3) switch on floating point emulation in the kernel and pass
1826 the "no387" option to the kernel
1827 4) pass the "floppy=nodma" option to the kernel
1828 5) pass the "mem=4M" option to the kernel (thereby disabling
1829 all but the first 4 MB of RAM)
1830 6) make sure that the CPU is not over clocked.
1831 7) read the sig11 FAQ at <http://www.bitwizard.nl/sig11/>
1832 8) disable the cache from your BIOS settings
1833 9) install a fan for the video card or exchange video RAM
1834 10) install a better fan for the CPU
1835 11) exchange RAM chips
1836 12) exchange the motherboard.
1837
1838 To compile this driver as a module, choose M here: the
1839 module will be called apm.
1840
1841if APM
1842
1843config APM_IGNORE_USER_SUSPEND
1844 bool "Ignore USER SUSPEND"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001845 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001846 This option will ignore USER SUSPEND requests. On machines with a
1847 compliant APM BIOS, you want to say N. However, on the NEC Versa M
1848 series notebooks, it is necessary to say Y because of a BIOS bug.
1849
1850config APM_DO_ENABLE
1851 bool "Enable PM at boot time"
1852 ---help---
1853 Enable APM features at boot time. From page 36 of the APM BIOS
1854 specification: "When disabled, the APM BIOS does not automatically
1855 power manage devices, enter the Standby State, enter the Suspend
1856 State, or take power saving steps in response to CPU Idle calls."
1857 This driver will make CPU Idle calls when Linux is idle (unless this
1858 feature is turned off -- see "Do CPU IDLE calls", below). This
1859 should always save battery power, but more complicated APM features
1860 will be dependent on your BIOS implementation. You may need to turn
1861 this option off if your computer hangs at boot time when using APM
1862 support, or if it beeps continuously instead of suspending. Turn
1863 this off if you have a NEC UltraLite Versa 33/C or a Toshiba
1864 T400CDT. This is off by default since most machines do fine without
1865 this feature.
1866
1867config APM_CPU_IDLE
1868 bool "Make CPU Idle calls when idle"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001869 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001870 Enable calls to APM CPU Idle/CPU Busy inside the kernel's idle loop.
1871 On some machines, this can activate improved power savings, such as
1872 a slowed CPU clock rate, when the machine is idle. These idle calls
1873 are made after the idle loop has run for some length of time (e.g.,
1874 333 mS). On some machines, this will cause a hang at boot time or
1875 whenever the CPU becomes idle. (On machines with more than one CPU,
1876 this option does nothing.)
1877
1878config APM_DISPLAY_BLANK
1879 bool "Enable console blanking using APM"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001880 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001881 Enable console blanking using the APM. Some laptops can use this to
1882 turn off the LCD backlight when the screen blanker of the Linux
1883 virtual console blanks the screen. Note that this is only used by
1884 the virtual console screen blanker, and won't turn off the backlight
1885 when using the X Window system. This also doesn't have anything to
1886 do with your VESA-compliant power-saving monitor. Further, this
1887 option doesn't work for all laptops -- it might not turn off your
1888 backlight at all, or it might print a lot of errors to the console,
1889 especially if you are using gpm.
1890
1891config APM_ALLOW_INTS
1892 bool "Allow interrupts during APM BIOS calls"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001893 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001894 Normally we disable external interrupts while we are making calls to
1895 the APM BIOS as a measure to lessen the effects of a badly behaving
1896 BIOS implementation. The BIOS should reenable interrupts if it
1897 needs to. Unfortunately, some BIOSes do not -- especially those in
1898 many of the newer IBM Thinkpads. If you experience hangs when you
1899 suspend, try setting this to Y. Otherwise, say N.
1900
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001901endif # APM
1902
Dave Jonesbb0a56e2011-05-19 18:51:07 -04001903source "drivers/cpufreq/Kconfig"
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001904
1905source "drivers/cpuidle/Kconfig"
1906
Andy Henroid27471fd2008-10-09 11:45:22 -07001907source "drivers/idle/Kconfig"
1908
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001909endmenu
1910
1911
1912menu "Bus options (PCI etc.)"
1913
1914config PCI
Ingo Molnar1ac97012008-05-19 14:10:14 +02001915 bool "PCI support"
Adrian Bunk1c858082008-01-30 13:32:32 +01001916 default y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001917 select ARCH_SUPPORTS_MSI if (X86_LOCAL_APIC && X86_IO_APIC)
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001918 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001919 Find out whether you have a PCI motherboard. PCI is the name of a
1920 bus system, i.e. the way the CPU talks to the other stuff inside
1921 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
1922 VESA. If you have PCI, say Y, otherwise N.
1923
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001924choice
1925 prompt "PCI access mode"
Ingo Molnarefefa6f2008-07-10 16:09:50 +02001926 depends on X86_32 && PCI
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001927 default PCI_GOANY
1928 ---help---
1929 On PCI systems, the BIOS can be used to detect the PCI devices and
1930 determine their configuration. However, some old PCI motherboards
1931 have BIOS bugs and may crash if this is done. Also, some embedded
1932 PCI-based systems don't have any BIOS at all. Linux can also try to
1933 detect the PCI hardware directly without using the BIOS.
1934
1935 With this option, you can specify how Linux should detect the
1936 PCI devices. If you choose "BIOS", the BIOS will be used,
1937 if you choose "Direct", the BIOS won't be used, and if you
1938 choose "MMConfig", then PCI Express MMCONFIG will be used.
1939 If you choose "Any", the kernel will try MMCONFIG, then the
1940 direct access method and falls back to the BIOS if that doesn't
1941 work. If unsure, go with the default, which is "Any".
1942
1943config PCI_GOBIOS
1944 bool "BIOS"
1945
1946config PCI_GOMMCONFIG
1947 bool "MMConfig"
1948
1949config PCI_GODIRECT
1950 bool "Direct"
1951
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07001952config PCI_GOOLPC
Daniel Drake76fb6572010-09-23 17:28:04 +01001953 bool "OLPC XO-1"
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07001954 depends on OLPC
1955
Andres Salomon2bdd1b02008-06-05 14:14:41 -07001956config PCI_GOANY
1957 bool "Any"
1958
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001959endchoice
1960
1961config PCI_BIOS
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001962 def_bool y
Ingo Molnarefefa6f2008-07-10 16:09:50 +02001963 depends on X86_32 && PCI && (PCI_GOBIOS || PCI_GOANY)
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001964
1965# x86-64 doesn't support PCI BIOS access from long mode so always go direct.
1966config PCI_DIRECT
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001967 def_bool y
Shaohua Li0aba4962011-05-27 14:59:39 +08001968 depends on PCI && (X86_64 || (PCI_GODIRECT || PCI_GOANY || PCI_GOOLPC || PCI_GOMMCONFIG))
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001969
1970config PCI_MMCONFIG
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001971 def_bool y
Feng Tang5f0db7a2009-08-14 15:37:50 -04001972 depends on X86_32 && PCI && (ACPI || SFI) && (PCI_GOMMCONFIG || PCI_GOANY)
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001973
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07001974config PCI_OLPC
Andres Salomon2bdd1b02008-06-05 14:14:41 -07001975 def_bool y
1976 depends on PCI && OLPC && (PCI_GOOLPC || PCI_GOANY)
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07001977
Alex Nixonb5401a92010-03-18 16:31:34 -04001978config PCI_XEN
1979 def_bool y
1980 depends on PCI && XEN
1981 select SWIOTLB_XEN
1982
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001983config PCI_DOMAINS
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001984 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001985 depends on PCI
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001986
1987config PCI_MMCONFIG
1988 bool "Support mmconfig PCI config space access"
1989 depends on X86_64 && PCI && ACPI
1990
Ira W. Snyder3f6ea842010-04-01 11:43:30 -07001991config PCI_CNB20LE_QUIRK
David Rientjes6a108a12011-01-20 14:44:16 -08001992 bool "Read CNB20LE Host Bridge Windows" if EXPERT
Bjorn Helgaas64a5fed2011-01-06 10:12:30 -07001993 depends on PCI && EXPERIMENTAL
Ira W. Snyder3f6ea842010-04-01 11:43:30 -07001994 help
1995 Read the PCI windows out of the CNB20LE host bridge. This allows
1996 PCI hotplug to work on systems with the CNB20LE chipset which do
1997 not have ACPI.
1998
Bjorn Helgaas64a5fed2011-01-06 10:12:30 -07001999 There's no public spec for this chipset, and this functionality
2000 is known to be incomplete.
2001
2002 You should say N unless you know you need this.
2003
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002004source "drivers/pci/pcie/Kconfig"
2005
2006source "drivers/pci/Kconfig"
2007
David Rientjes1c00f012011-03-22 16:34:59 -07002008# x86_64 have no ISA slots, but can have ISA-style DMA.
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002009config ISA_DMA_API
David Rientjes1c00f012011-03-22 16:34:59 -07002010 bool "ISA-style DMA support" if (X86_64 && EXPERT)
2011 default y
2012 help
2013 Enables ISA-style DMA support for devices requiring such controllers.
2014 If unsure, say Y.
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002015
2016if X86_32
2017
2018config ISA
2019 bool "ISA support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002020 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002021 Find out whether you have ISA slots on your motherboard. ISA is the
2022 name of a bus system, i.e. the way the CPU talks to the other stuff
2023 inside your box. Other bus systems are PCI, EISA, MicroChannel
2024 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
2025 newer boards don't support it. If you have ISA, say Y, otherwise N.
2026
2027config EISA
2028 bool "EISA support"
2029 depends on ISA
2030 ---help---
2031 The Extended Industry Standard Architecture (EISA) bus was
2032 developed as an open alternative to the IBM MicroChannel bus.
2033
2034 The EISA bus provided some of the features of the IBM MicroChannel
2035 bus while maintaining backward compatibility with cards made for
2036 the older ISA bus. The EISA bus saw limited use between 1988 and
2037 1995 when it was made obsolete by the PCI bus.
2038
2039 Say Y here if you are building a kernel for an EISA-based machine.
2040
2041 Otherwise, say N.
2042
2043source "drivers/eisa/Kconfig"
2044
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002045config SCx200
2046 tristate "NatSemi SCx200 support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002047 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002048 This provides basic support for National Semiconductor's
2049 (now AMD's) Geode processors. The driver probes for the
2050 PCI-IDs of several on-chip devices, so its a good dependency
2051 for other scx200_* drivers.
2052
2053 If compiled as a module, the driver is named scx200.
2054
2055config SCx200HR_TIMER
2056 tristate "NatSemi SCx200 27MHz High-Resolution Timer Support"
John Stultz592913e2010-07-13 17:56:20 -07002057 depends on SCx200
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002058 default y
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002059 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002060 This driver provides a clocksource built upon the on-chip
2061 27MHz high-resolution timer. Its also a workaround for
2062 NSC Geode SC-1100's buggy TSC, which loses time when the
2063 processor goes idle (as is done by the scheduler). The
2064 other workaround is idle=poll boot option.
2065
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07002066config OLPC
2067 bool "One Laptop Per Child support"
Thomas Gleixner54008972011-02-23 09:50:15 +01002068 depends on !X86_PAE
Andres Salomon3c554942009-12-14 18:00:36 -08002069 select GPIOLIB
Thomas Gleixnerdc3119e72011-02-23 10:08:31 +01002070 select OF
Daniel Drake45bb1672011-03-13 15:10:17 +00002071 select OF_PROMTREE
Grant Likelyb4e51852011-12-16 15:50:17 -07002072 select IRQ_DOMAIN
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002073 ---help---
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07002074 Add support for detecting the unique features of the OLPC
2075 XO hardware.
2076
Daniel Drakea3128582011-06-25 17:34:10 +01002077config OLPC_XO1_PM
2078 bool "OLPC XO-1 Power Management"
Daniel Drake97c4cb72011-06-25 17:34:11 +01002079 depends on OLPC && MFD_CS5535 && PM_SLEEP
Daniel Drakea3128582011-06-25 17:34:10 +01002080 select MFD_CORE
Daniel Drakebf1ebf02010-10-10 10:40:32 +01002081 ---help---
Daniel Drake97c4cb72011-06-25 17:34:11 +01002082 Add support for poweroff and suspend of the OLPC XO-1 laptop.
Daniel Drakebf1ebf02010-10-10 10:40:32 +01002083
Daniel Drakecfee9592011-06-25 17:34:17 +01002084config OLPC_XO1_RTC
2085 bool "OLPC XO-1 Real Time Clock"
2086 depends on OLPC_XO1_PM && RTC_DRV_CMOS
2087 ---help---
2088 Add support for the XO-1 real time clock, which can be used as a
2089 programmable wakeup source.
2090
Daniel Drake7feda8e2011-06-25 17:34:12 +01002091config OLPC_XO1_SCI
2092 bool "OLPC XO-1 SCI extras"
Daniel Draked8d01a62011-07-24 18:33:21 +01002093 depends on OLPC && OLPC_XO1_PM
2094 select POWER_SUPPLY
Daniel Drake7feda8e2011-06-25 17:34:12 +01002095 select GPIO_CS5535
2096 select MFD_CORE
2097 ---help---
2098 Add support for SCI-based features of the OLPC XO-1 laptop:
Daniel Drake7bc74b32011-06-25 17:34:14 +01002099 - EC-driven system wakeups
Daniel Drake7feda8e2011-06-25 17:34:12 +01002100 - Power button
Daniel Drake7bc74b32011-06-25 17:34:14 +01002101 - Ebook switch
Daniel Drake2cf2bae2011-06-25 17:34:15 +01002102 - Lid switch
Daniel Drakee1040ac2011-06-25 17:34:16 +01002103 - AC adapter status updates
2104 - Battery status updates
Daniel Drake7feda8e2011-06-25 17:34:12 +01002105
Daniel Drakea0f30f52011-06-25 17:34:18 +01002106config OLPC_XO15_SCI
2107 bool "OLPC XO-1.5 SCI extras"
Daniel Draked8d01a62011-07-24 18:33:21 +01002108 depends on OLPC && ACPI
2109 select POWER_SUPPLY
Daniel Drakea0f30f52011-06-25 17:34:18 +01002110 ---help---
2111 Add support for SCI-based features of the OLPC XO-1.5 laptop:
2112 - EC-driven system wakeups
2113 - AC adapter status updates
2114 - Battery status updates
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002115
Ed Wildgoosed4f3e352011-09-20 14:00:12 -07002116config ALIX
2117 bool "PCEngines ALIX System Support (LED setup)"
2118 select GPIOLIB
2119 ---help---
2120 This option enables system support for the PCEngines ALIX.
2121 At present this just sets up LEDs for GPIO control on
2122 ALIX2/3/6 boards. However, other system specific setup should
2123 get added here.
2124
2125 Note: You must still enable the drivers for GPIO and LED support
2126 (GPIO_CS5535 & LEDS_GPIO) to actually use the LEDs
2127
2128 Note: You have to set alix.force=1 for boards with Award BIOS.
2129
Philip Prindevilleda4e3302012-03-05 15:05:15 -08002130config NET5501
2131 bool "Soekris Engineering net5501 System Support (LEDS, GPIO, etc)"
2132 select GPIOLIB
2133 ---help---
2134 This option enables system support for the Soekris Engineering net5501.
2135
Philip A. Prindeville31970592012-01-14 01:45:39 -07002136config GEOS
2137 bool "Traverse Technologies GEOS System Support (LEDS, GPIO, etc)"
2138 select GPIOLIB
2139 depends on DMI
2140 ---help---
2141 This option enables system support for the Traverse Technologies GEOS.
2142
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002143endif # X86_32
2144
Andreas Herrmann23ac4ae2010-09-17 18:03:43 +02002145config AMD_NB
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002146 def_bool y
Borislav Petkov0e152cd2010-03-12 15:43:03 +01002147 depends on CPU_SUP_AMD && PCI
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002148
2149source "drivers/pcmcia/Kconfig"
2150
2151source "drivers/pci/hotplug/Kconfig"
2152
Alexandre Bounine388b78a2011-03-23 16:43:03 -07002153config RAPIDIO
2154 bool "RapidIO support"
2155 depends on PCI
2156 default n
2157 help
2158 If you say Y here, the kernel will include drivers and
2159 infrastructure code to support RapidIO interconnect devices.
2160
2161source "drivers/rapidio/Kconfig"
2162
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002163endmenu
2164
2165
2166menu "Executable file formats / Emulations"
2167
2168source "fs/Kconfig.binfmt"
2169
2170config IA32_EMULATION
2171 bool "IA32 Emulation"
2172 depends on X86_64
Roland McGratha97f52e2008-01-30 13:31:55 +01002173 select COMPAT_BINFMT_ELF
Catalin Marinasaf1839e2012-10-08 16:28:08 -07002174 select HAVE_UID16
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002175 ---help---
H. J. Lu5fd92e62012-02-19 10:40:03 -08002176 Include code to run legacy 32-bit programs under a
2177 64-bit kernel. You should likely turn this on, unless you're
2178 100% sure that you don't have any 32-bit programs left.
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002179
2180config IA32_AOUT
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002181 tristate "IA32 a.out support"
2182 depends on IA32_EMULATION
2183 ---help---
2184 Support old a.out binaries in the 32bit emulation.
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002185
H. Peter Anvin0bf62762012-02-27 14:09:10 -08002186config X86_X32
H. J. Lu5fd92e62012-02-19 10:40:03 -08002187 bool "x32 ABI for 64-bit mode (EXPERIMENTAL)"
2188 depends on X86_64 && IA32_EMULATION && EXPERIMENTAL
2189 ---help---
2190 Include code to run binaries for the x32 native 32-bit ABI
2191 for 64-bit processors. An x32 process gets access to the
2192 full 64-bit register file and wide data path while leaving
2193 pointers at 32 bits for smaller memory footprint.
2194
2195 You will need a recent binutils (2.22 or later) with
2196 elf32_x86_64 support enabled to compile a kernel with this
2197 option set.
2198
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002199config COMPAT
Harvey Harrison3c2362e2008-01-30 13:31:03 +01002200 def_bool y
H. Peter Anvin0bf62762012-02-27 14:09:10 -08002201 depends on IA32_EMULATION || X86_X32
Chris Metcalf48b25c42012-03-15 13:13:38 -04002202 select ARCH_WANT_OLD_COMPAT_IPC
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002203
Jan Beulich3120e252012-09-10 12:41:45 +01002204if COMPAT
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002205config COMPAT_FOR_U64_ALIGNMENT
Jan Beulich3120e252012-09-10 12:41:45 +01002206 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002207
2208config SYSVIPC_COMPAT
Harvey Harrison3c2362e2008-01-30 13:31:03 +01002209 def_bool y
Jan Beulich3120e252012-09-10 12:41:45 +01002210 depends on SYSVIPC
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002211
David Howellsee009e4a02011-03-07 15:06:20 +00002212config KEYS_COMPAT
Jan Beulich3120e252012-09-10 12:41:45 +01002213 def_bool y
2214 depends on KEYS
2215endif
David Howellsee009e4a02011-03-07 15:06:20 +00002216
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002217endmenu
2218
2219
Keith Packarde5beae12008-11-03 18:21:45 +01002220config HAVE_ATOMIC_IOMAP
2221 def_bool y
2222 depends on X86_32
2223
Masami Hiramatsu3cba11d2010-10-14 12:10:42 +09002224config HAVE_TEXT_POKE_SMP
2225 bool
2226 select STOP_MACHINE if SMP
2227
Alessandro Rubini4692d772012-04-04 19:39:58 +02002228config X86_DEV_DMA_OPS
2229 bool
Alessandro Rubini83125a32012-04-04 19:40:21 +02002230 depends on X86_64 || STA2X11
Alessandro Rubini4692d772012-04-04 19:39:58 +02002231
Alessandro Rubinif7219a52012-04-04 19:40:10 +02002232config X86_DMA_REMAP
2233 bool
Alessandro Rubini83125a32012-04-04 19:40:21 +02002234 depends on STA2X11
Alessandro Rubinif7219a52012-04-04 19:40:10 +02002235
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002236source "net/Kconfig"
2237
2238source "drivers/Kconfig"
2239
2240source "drivers/firmware/Kconfig"
2241
2242source "fs/Kconfig"
2243
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002244source "arch/x86/Kconfig.debug"
2245
2246source "security/Kconfig"
2247
2248source "crypto/Kconfig"
2249
Avi Kivityedf88412007-12-16 11:02:48 +02002250source "arch/x86/kvm/Kconfig"
2251
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002252source "lib/Kconfig"