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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
10 def_bool !64BIT
11
12config X86_64
13 def_bool 64BIT
Sam Ravnborg1032c0b2007-11-06 21:35:08 +010014
15### Arch settings
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010016config X86
Harvey Harrison3c2362e2008-01-30 13:31:03 +010017 def_bool y
David Woodhousee17c6d52008-06-17 12:19:34 +010018 select HAVE_AOUT if X86_32
Hitoshi Mitake2c5643b2008-11-30 17:16:04 +090019 select HAVE_READQ
20 select HAVE_WRITEQ
Ingo Molnara5574cf2008-05-05 23:19:50 +020021 select HAVE_UNSTABLE_SCHED_CLOCK
Sam Ravnborgec7748b2008-02-09 10:46:40 +010022 select HAVE_IDE
Mathieu Desnoyers42d4b832008-02-02 15:10:34 -050023 select HAVE_OPROFILE
Peter Zijlstracc2067a2010-11-16 21:49:01 +010024 select HAVE_PERF_EVENTS
Peter Zijlstrae360adb2010-10-14 14:01:34 +080025 select HAVE_IRQ_WORK
Rik van Riel28b2ee22008-07-23 21:27:05 -070026 select HAVE_IOREMAP_PROT
Mathieu Desnoyers3f550092008-02-02 15:10:35 -050027 select HAVE_KPROBES
Yinghai Lu72d7c3b2010-08-25 13:39:17 -070028 select HAVE_MEMBLOCK
Ingo Molnar1f972762008-07-26 13:52:50 +020029 select ARCH_WANT_OPTIONAL_GPIOLIB
Ingo Molnarda4276b2009-01-07 11:05:10 +010030 select ARCH_WANT_FRAME_POINTERS
FUJITA Tomonori7c095e42009-06-17 16:28:12 -070031 select HAVE_DMA_ATTRS
Ananth N Mavinakayanahalli9edddaa2008-03-04 14:28:37 -080032 select HAVE_KRETPROBES
Masami Hiramatsuc0f7ac32010-02-25 08:34:46 -050033 select HAVE_OPTPROBES
Steven Rostedte4b2b882008-08-14 15:45:11 -040034 select HAVE_FTRACE_MCOUNT_RECORD
Steven Rostedtcf4db252010-10-14 23:32:44 -040035 select HAVE_C_RECORDMCOUNT
Steven Rostedt677aa9f2008-05-17 00:01:36 -040036 select HAVE_DYNAMIC_FTRACE
Steven Rostedt606576c2008-10-06 19:06:12 -040037 select HAVE_FUNCTION_TRACER
Frederic Weisbecker48d68b22008-12-02 00:20:39 +010038 select HAVE_FUNCTION_GRAPH_TRACER
Steven Rostedt71e308a2009-06-18 12:45:08 -040039 select HAVE_FUNCTION_GRAPH_FP_TEST
Steven Rostedt60a7ecf2008-11-05 16:05:44 -050040 select HAVE_FUNCTION_TRACE_MCOUNT_TEST
Steven Rostedt9a5fd902009-02-06 01:14:26 -050041 select HAVE_FTRACE_NMI_ENTER if DYNAMIC_FTRACE
Josh Stone66700002009-08-24 14:43:11 -070042 select HAVE_SYSCALL_TRACEPOINTS
Ingo Molnare0ec9482009-01-27 17:01:14 +010043 select HAVE_KVM
Ingo Molnar49793b02009-01-27 17:02:29 +010044 select HAVE_ARCH_KGDB
Roland McGrath99bbc4b2008-04-20 14:35:12 -070045 select HAVE_ARCH_TRACEHOOK
Dmitry Baryshkov323ec002008-06-29 14:19:31 +040046 select HAVE_GENERIC_DMA_COHERENT if X86_32
Johannes Berg58340a02008-07-25 01:45:33 -070047 select HAVE_EFFICIENT_UNALIGNED_ACCESS
Török Edwin8d264872008-11-23 12:39:08 +020048 select USER_STACKTRACE_SUPPORT
Heiko Carstensf850c30c2010-02-10 17:25:17 +010049 select HAVE_REGS_AND_STACK_ACCESS_API
Joerg Roedel2118d0c2009-01-09 15:13:15 +010050 select HAVE_DMA_API_DEBUG
H. Peter Anvin2e9f3bd2009-01-04 15:41:25 -080051 select HAVE_KERNEL_GZIP
52 select HAVE_KERNEL_BZIP2
53 select HAVE_KERNEL_LZMA
Lasse Collin30314802011-01-12 17:01:24 -080054 select HAVE_KERNEL_XZ
Albin Tonnerre13510992010-01-08 14:42:45 -080055 select HAVE_KERNEL_LZO
K.Prasad0067f122009-06-01 23:43:57 +053056 select HAVE_HW_BREAKPOINT
Frederic Weisbecker01027522010-04-11 18:55:56 +020057 select HAVE_MIXED_BREAKPOINTS_REGS
Frederic Weisbecker99e8c5a2009-12-17 01:33:54 +010058 select PERF_EVENTS
Frederic Weisbeckerc01d4322010-05-15 22:57:48 +020059 select HAVE_PERF_EVENTS_NMI
Frederic Weisbecker99e8c5a2009-12-17 01:33:54 +010060 select ANON_INODES
Pekka Enberg0a4af3b2009-02-26 21:38:56 +020061 select HAVE_ARCH_KMEMCHECK
Avi Kivity7c68af62009-09-19 09:40:22 +030062 select HAVE_USER_RETURN_NOTIFIER
Steven Rostedt46eb3b62010-09-22 23:10:23 -040063 select HAVE_ARCH_JUMP_LABEL
Masami Hiramatsu3cba11d2010-10-14 12:10:42 +090064 select HAVE_TEXT_POKE_SMP
Thomas Gleixner3bb98082010-09-27 12:46:02 +000065 select HAVE_GENERIC_HARDIRQS
66 select HAVE_SPARSE_IRQ
Jan Beulichc49aa5b2011-03-08 09:24:26 +000067 select GENERIC_FIND_FIRST_BIT
68 select GENERIC_FIND_NEXT_BIT
Thomas Gleixner3bb98082010-09-27 12:46:02 +000069 select GENERIC_IRQ_PROBE
70 select GENERIC_PENDING_IRQ if SMP
Thomas Gleixner517e4982010-12-16 17:59:57 +010071 select GENERIC_IRQ_SHOW
Thomas Gleixnerc01858082011-02-07 02:24:08 +010072 select IRQ_FORCED_THREADING
Amerigo Wang351f8f82011-01-12 16:59:39 -080073 select USE_GENERIC_SMP_HELPERS if SMP
Rafael J. Wysockid47d81c2011-03-23 22:16:41 +010074 select ARCH_NO_SYSDEV_OPS
Balbir Singh7d8330a2008-02-10 12:46:28 +053075
Ingo Molnarba7e4d12009-06-06 13:58:12 +020076config INSTRUCTION_DECODER
77 def_bool (KPROBES || PERF_EVENTS)
78
Linus Torvalds51b26ad2009-04-26 10:12:47 -070079config OUTPUT_FORMAT
80 string
81 default "elf32-i386" if X86_32
82 default "elf64-x86-64" if X86_64
83
Sam Ravnborg73531902008-05-25 23:03:18 +020084config ARCH_DEFCONFIG
Sam Ravnborgb9b39bf2008-04-29 12:48:15 +020085 string
Sam Ravnborg73531902008-05-25 23:03:18 +020086 default "arch/x86/configs/i386_defconfig" if X86_32
87 default "arch/x86/configs/x86_64_defconfig" if X86_64
Sam Ravnborgb9b39bf2008-04-29 12:48:15 +020088
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010089config GENERIC_CMOS_UPDATE
Harvey Harrison3c2362e2008-01-30 13:31:03 +010090 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010091
92config CLOCKSOURCE_WATCHDOG
Harvey Harrison3c2362e2008-01-30 13:31:03 +010093 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010094
95config GENERIC_CLOCKEVENTS
Harvey Harrison3c2362e2008-01-30 13:31:03 +010096 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010097
98config GENERIC_CLOCKEVENTS_BROADCAST
Harvey Harrison3c2362e2008-01-30 13:31:03 +010099 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100100 depends on X86_64 || (X86_32 && X86_LOCAL_APIC)
101
102config LOCKDEP_SUPPORT
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100103 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100104
105config STACKTRACE_SUPPORT
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100106 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100107
Heiko Carstensaa7d9352008-02-01 17:45:14 +0100108config HAVE_LATENCYTOP_SUPPORT
109 def_bool y
110
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100111config MMU
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100112 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100113
114config ZONE_DMA
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100115 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100116
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100117config SBUS
118 bool
119
FUJITA Tomonori3bc4e452010-03-10 15:23:22 -0800120config NEED_DMA_MAP_STATE
121 def_bool (X86_64 || DMAR || DMA_API_DEBUG)
122
FUJITA Tomonori18e98302010-05-26 14:44:32 -0700123config NEED_SG_DMA_LENGTH
Andrew Morton4a14d842010-05-26 14:44:33 -0700124 def_bool y
FUJITA Tomonori18e98302010-05-26 14:44:32 -0700125
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100126config GENERIC_ISA_DMA
David Rientjes1c00f012011-03-22 16:34:59 -0700127 def_bool ISA_DMA_API
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100128
129config GENERIC_IOMAP
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100130 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100131
132config GENERIC_BUG
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100133 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100134 depends on BUG
Jan Beulichb93a5312008-12-16 11:40:27 +0000135 select GENERIC_BUG_RELATIVE_POINTERS if X86_64
136
137config GENERIC_BUG_RELATIVE_POINTERS
138 bool
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100139
140config GENERIC_HWEIGHT
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100141 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100142
Florian Fainellia6082952008-01-30 13:33:35 +0100143config GENERIC_GPIO
Jan Beulich9ba16082008-10-15 22:01:38 -0700144 bool
Florian Fainellia6082952008-01-30 13:33:35 +0100145
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100146config ARCH_MAY_HAVE_PC_FDC
David Rientjes8df3bd92011-03-22 16:34:58 -0700147 def_bool ISA_DMA_API
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100148
Sam Ravnborg1032c0b2007-11-06 21:35:08 +0100149config RWSEM_GENERIC_SPINLOCK
150 def_bool !X86_XADD
151
152config RWSEM_XCHGADD_ALGORITHM
153 def_bool X86_XADD
154
Venki Pallipadia6869cc2008-02-08 17:05:44 -0800155config ARCH_HAS_CPU_IDLE_WAIT
156 def_bool y
157
Sam Ravnborg1032c0b2007-11-06 21:35:08 +0100158config GENERIC_CALIBRATE_DELAY
159 def_bool y
160
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100161config GENERIC_TIME_VSYSCALL
162 bool
163 default X86_64
164
venkatesh.pallipadi@intel.com9a0b8412008-01-31 17:35:06 -0800165config ARCH_HAS_CPU_RELAX
166 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100167
Venkatesh Pallipadi89cedfe2008-10-16 19:00:08 -0400168config ARCH_HAS_DEFAULT_IDLE
169 def_bool y
170
Pekka Enberg1b27d052008-04-28 02:12:22 -0700171config ARCH_HAS_CACHE_LINE_SIZE
172 def_bool y
173
Mike Travisdd5af902008-01-30 13:33:32 +0100174config HAVE_SETUP_PER_CPU_AREA
Brian Gerst89c9c4c2009-01-27 12:56:48 +0900175 def_bool y
travis@sgi.comb32ef632008-01-30 13:32:51 +0100176
Tejun Heo08fc4582009-08-14 15:00:49 +0900177config NEED_PER_CPU_EMBED_FIRST_CHUNK
178 def_bool y
179
180config NEED_PER_CPU_PAGE_FIRST_CHUNK
Tejun Heo11124412009-02-20 16:29:09 +0900181 def_bool y
182
Mike Travis9f0e8d02008-04-04 18:11:01 -0700183config HAVE_CPUMASK_OF_CPU_MAP
184 def_bool X86_64_SMP
185
Johannes Berg801e4062007-12-08 02:12:39 +0100186config ARCH_HIBERNATION_POSSIBLE
187 def_bool y
Johannes Berg801e4062007-12-08 02:12:39 +0100188
Johannes Bergf4cb5702007-12-08 02:14:00 +0100189config ARCH_SUSPEND_POSSIBLE
190 def_bool y
Johannes Bergf4cb5702007-12-08 02:14:00 +0100191
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100192config ZONE_DMA32
193 bool
194 default X86_64
195
196config ARCH_POPULATES_NODE_MAP
197 def_bool y
198
199config AUDIT_ARCH
200 bool
201 default X86_64
202
Ingo Molnar765c68b2008-04-09 11:03:37 +0200203config ARCH_SUPPORTS_OPTIMIZED_INLINING
204 def_bool y
205
Akinobu Mita6a11f752009-03-31 15:23:17 -0700206config ARCH_SUPPORTS_DEBUG_PAGEALLOC
207 def_bool y
208
Shane Wang69575d32009-09-01 18:25:07 -0700209config HAVE_INTEL_TXT
210 def_bool y
211 depends on EXPERIMENTAL && DMAR && ACPI
212
Sam Ravnborg6b0c3d42008-01-30 13:32:27 +0100213config X86_32_SMP
214 def_bool y
215 depends on X86_32 && SMP
216
217config X86_64_SMP
218 def_bool y
219 depends on X86_64 && SMP
220
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100221config X86_HT
Jan Beulich6fc108a2010-04-21 15:23:44 +0100222 def_bool y
Adrian Bunkee0011a2007-12-04 17:19:07 +0100223 depends on SMP
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100224
Tejun Heoccbeed32009-02-09 22:17:40 +0900225config X86_32_LAZY_GS
226 def_bool y
Tejun Heo60a53172009-02-09 22:17:40 +0900227 depends on X86_32 && !CC_STACKPROTECTOR
Tejun Heoccbeed32009-02-09 22:17:40 +0900228
Borislav Petkovd61931d2010-03-05 17:34:46 +0100229config ARCH_HWEIGHT_CFLAGS
230 string
231 default "-fcall-saved-ecx -fcall-saved-edx" if X86_32
232 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
233
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100234config KTIME_SCALAR
235 def_bool X86_32
Borislav Petkovd7c53c92010-08-19 20:10:29 +0200236
237config ARCH_CPU_PROBE_RELEASE
238 def_bool y
239 depends on HOTPLUG_CPU
240
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100241source "init/Kconfig"
Matt Helsleydc52ddc2008-10-18 20:27:21 -0700242source "kernel/Kconfig.freezer"
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100243
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100244menu "Processor type and features"
245
246source "kernel/time/Kconfig"
247
248config SMP
249 bool "Symmetric multi-processing support"
250 ---help---
251 This enables support for systems with more than one CPU. If you have
252 a system with only one CPU, like most personal computers, say N. If
253 you have a system with more than one CPU, say Y.
254
255 If you say N here, the kernel will run on single and multiprocessor
256 machines, but will use only one CPU of a multiprocessor machine. If
257 you say Y here, the kernel will run on many, but not all,
258 singleprocessor machines. On a singleprocessor machine, the kernel
259 will run faster if you say N here.
260
261 Note that if you say Y here and choose architecture "586" or
262 "Pentium" under "Processor family", the kernel will not work on 486
263 architectures. Similarly, multiprocessor kernels for the "PPro"
264 architecture may not work on all Pentium based boards.
265
266 People using multiprocessor machines who say Y here should also say
267 Y to "Enhanced Real Time Clock Support", below. The "Advanced Power
268 Management" code will be disabled if you say Y here.
269
Adrian Bunk03502fa2008-02-03 15:50:21 +0200270 See also <file:Documentation/i386/IO-APIC.txt>,
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100271 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
272 <http://www.tldp.org/docs.html#howto>.
273
274 If you don't know what to do here, say N.
275
Yinghai Lu06cd9a72009-02-16 17:29:58 -0800276config X86_X2APIC
277 bool "Support x2apic"
David Woodhousef7d7f862009-04-06 23:04:40 -0700278 depends on X86_LOCAL_APIC && X86_64 && INTR_REMAP
Yinghai Lu06cd9a72009-02-16 17:29:58 -0800279 ---help---
280 This enables x2apic support on CPUs that have this feature.
281
282 This allows 32-bit apic IDs (so it can support very large systems),
283 and accesses the local apic via MSRs not via mmio.
284
Yinghai Lu06cd9a72009-02-16 17:29:58 -0800285 If you don't know what to do here, say N.
286
Yinghai Lu6695c852008-06-19 12:13:09 -0700287config X86_MPPARSE
Jan Beulich7a527682008-10-30 10:38:24 +0000288 bool "Enable MPS table" if ACPI
289 default y
Ingo Molnar5ab74722008-07-10 14:42:03 +0200290 depends on X86_LOCAL_APIC
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100291 ---help---
Yinghai Lu6695c852008-06-19 12:13:09 -0700292 For old smp systems that do not have proper acpi support. Newer systems
293 (esp with 64bit cpus) with acpi support, MADT and DSDT will override it
Yinghai Lu6695c852008-06-19 12:13:09 -0700294
Yinghai Lu26f7ef12009-01-29 14:19:22 -0800295config X86_BIGSMP
296 bool "Support for big SMP systems with more than 8 CPUs"
297 depends on X86_32 && SMP
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100298 ---help---
Yinghai Lu26f7ef12009-01-29 14:19:22 -0800299 This option is needed for the systems that have more than 8 CPUs
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100300
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800301if X86_32
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800302config X86_EXTENDED_PLATFORM
303 bool "Support for extended (non-PC) x86 platforms"
304 default y
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100305 ---help---
Ingo Molnar06ac8342009-01-27 18:11:43 +0100306 If you disable this option then the kernel will only support
307 standard PC platforms. (which covers the vast majority of
308 systems out there.)
309
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800310 If you enable this option then you'll be able to select support
311 for the following (non-PC) 32 bit x86 platforms:
312 AMD Elan
313 NUMAQ (IBM/Sequent)
314 RDC R-321x SoC
315 SGI 320/540 (Visual Workstation)
316 Summit/EXA (IBM x440)
317 Unisys ES7000 IA32 series
Thomas Gleixner3f4110a2009-08-29 14:54:20 +0200318 Moorestown MID devices
Ingo Molnar06ac8342009-01-27 18:11:43 +0100319
320 If you have one of these systems, or if you want to build a
321 generic distribution kernel, say Y here - otherwise say N.
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800322endif
Ingo Molnar06ac8342009-01-27 18:11:43 +0100323
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800324if X86_64
325config X86_EXTENDED_PLATFORM
326 bool "Support for extended (non-PC) x86 platforms"
327 default y
328 ---help---
329 If you disable this option then the kernel will only support
330 standard PC platforms. (which covers the vast majority of
331 systems out there.)
332
333 If you enable this option then you'll be able to select support
334 for the following (non-PC) 64 bit x86 platforms:
335 ScaleMP vSMP
336 SGI Ultraviolet
337
338 If you have one of these systems, or if you want to build a
339 generic distribution kernel, say Y here - otherwise say N.
340endif
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800341# This is an alphabetically sorted list of 64 bit extended platforms
342# Please maintain the alphabetic order if and when there are additions
Nick Piggin03b48632009-01-20 04:36:04 +0100343
Ingo Molnar6a485652009-01-27 18:29:13 +0100344config X86_VSMP
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800345 bool "ScaleMP vSMP"
Randy Dunlap03f1a172010-10-13 21:00:23 -0700346 select PARAVIRT_GUEST
Ingo Molnar6a485652009-01-27 18:29:13 +0100347 select PARAVIRT
348 depends on X86_64 && PCI
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800349 depends on X86_EXTENDED_PLATFORM
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100350 ---help---
Ingo Molnar6a485652009-01-27 18:29:13 +0100351 Support for ScaleMP vSMP systems. Say 'Y' here if this kernel is
352 supposed to run on these EM64T-based machines. Only choose this option
353 if you have one of these machines.
354
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800355config X86_UV
356 bool "SGI Ultraviolet"
357 depends on X86_64
358 depends on X86_EXTENDED_PLATFORM
Jack Steiner54c28d22009-04-03 15:39:42 -0500359 depends on NUMA
Suresh Siddha9d6c26e2009-04-20 13:02:31 -0700360 depends on X86_X2APIC
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800361 ---help---
362 This option is needed in order to support SGI Ultraviolet systems.
363 If you don't have one of these, you should say N here.
364
365# Following is an alphabetically sorted list of 32 bit extended platforms
366# Please maintain the alphabetic order if and when there are additions
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100367
368config X86_ELAN
369 bool "AMD Elan"
370 depends on X86_32
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800371 depends on X86_EXTENDED_PLATFORM
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100372 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100373 Select this for an AMD Elan processor.
374
375 Do not use this option for K6/Athlon/Opteron processors!
376
377 If unsure, choose "PC-compatible" instead.
378
Thomas Gleixnerc751e172010-11-09 12:08:04 -0800379config X86_INTEL_CE
380 bool "CE4100 TV platform"
381 depends on PCI
382 depends on PCI_GODIRECT
383 depends on X86_32
384 depends on X86_EXTENDED_PLATFORM
Dirk Brandewie37bc9f52010-11-09 12:08:08 -0800385 select X86_REBOOTFIXUPS
Sebastian Andrzej Siewiorda6b7372011-02-22 21:07:37 +0100386 select OF
387 select OF_EARLY_FLATTREE
Thomas Gleixnerc751e172010-11-09 12:08:04 -0800388 ---help---
389 Select for the Intel CE media processor (CE4100) SOC.
390 This option compiles in support for the CE4100 SOC for settop
391 boxes and media devices.
392
Thomas Gleixner3f4110a2009-08-29 14:54:20 +0200393config X86_MRST
394 bool "Moorestown MID platform"
Jacob Pan4b2f3f72010-02-25 10:02:14 -0800395 depends on PCI
396 depends on PCI_GOANY
Thomas Gleixner3f4110a2009-08-29 14:54:20 +0200397 depends on X86_32
398 depends on X86_EXTENDED_PLATFORM
Jacob Pan4b2f3f72010-02-25 10:02:14 -0800399 depends on X86_IO_APIC
Jacob Panbb24c472009-09-02 07:37:17 -0700400 select APB_TIMER
Feng Tang1da4b1c2010-11-09 11:22:58 +0000401 select I2C
402 select SPI
Alan Coxb9fc71f2010-11-15 17:31:19 +0000403 select INTEL_SCU_IPC
Randy Dunlapad025192010-11-15 10:14:06 -0800404 select X86_PLATFORM_DEVICES
Thomas Gleixner3f4110a2009-08-29 14:54:20 +0200405 ---help---
406 Moorestown is Intel's Low Power Intel Architecture (LPIA) based Moblin
407 Internet Device(MID) platform. Moorestown consists of two chips:
408 Lincroft (CPU core, graphics, and memory controller) and Langwell IOH.
409 Unlike standard x86 PCs, Moorestown does not have many legacy devices
410 nor standard legacy replacement devices/features. e.g. Moorestown does
411 not contain i8259, i8254, HPET, legacy BIOS, most of the io ports.
412
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800413config X86_RDC321X
414 bool "RDC R-321x SoC"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100415 depends on X86_32
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800416 depends on X86_EXTENDED_PLATFORM
417 select M486
418 select X86_REBOOTFIXUPS
419 ---help---
420 This option is needed for RDC R-321x system-on-chip, also known
421 as R-8610-(G).
422 If you don't have one of these chips, you should say N here.
423
Ingo Molnare0c7ae32009-01-27 18:43:09 +0100424config X86_32_NON_STANDARD
Ingo Molnar9c398012009-01-27 18:24:57 +0100425 bool "Support non-standard 32-bit SMP architectures"
426 depends on X86_32 && SMP
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800427 depends on X86_EXTENDED_PLATFORM
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100428 ---help---
429 This option compiles in the NUMAQ, Summit, bigsmp, ES7000, default
Yinghai Lud49c4282008-06-08 18:31:54 -0700430 subarchitectures. It is intended for a generic binary kernel.
431 if you select them all, kernel will probe it one by one. and will
432 fallback to default.
433
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800434# Alphabetically sorted list of Non standard 32 bit platforms
Yinghai Lud49c4282008-06-08 18:31:54 -0700435
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100436config X86_NUMAQ
437 bool "NUMAQ (IBM/Sequent)"
Ingo Molnare0c7ae32009-01-27 18:43:09 +0100438 depends on X86_32_NON_STANDARD
Pan, Jacob juna92d1522010-02-24 16:59:55 -0800439 depends on PCI
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100440 select NUMA
Ingo Molnar9c398012009-01-27 18:24:57 +0100441 select X86_MPPARSE
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100442 ---help---
Yinghai Lud49c4282008-06-08 18:31:54 -0700443 This option is used for getting Linux to run on a NUMAQ (IBM/Sequent)
444 NUMA multiquad box. This changes the way that processors are
445 bootstrapped, and uses Clustered Logical APIC addressing mode instead
446 of Flat Logical. You will need a new lynxer.elf file to flash your
447 firmware with - send email to <Martin.Bligh@us.ibm.com>.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100448
Linus Torvaldsd949f362009-09-26 09:35:07 -0700449config X86_SUPPORTS_MEMORY_FAILURE
Jan Beulich6fc108a2010-04-21 15:23:44 +0100450 def_bool y
Linus Torvaldsd949f362009-09-26 09:35:07 -0700451 # MCE code calls memory_failure():
452 depends on X86_MCE
453 # On 32-bit this adds too big of NODES_SHIFT and we run out of page flags:
454 depends on !X86_NUMAQ
455 # On 32-bit SPARSEMEM adds too big of SECTIONS_WIDTH:
456 depends on X86_64 || !SPARSEMEM
457 select ARCH_SUPPORTS_MEMORY_FAILURE
Linus Torvaldsd949f362009-09-26 09:35:07 -0700458
Ingo Molnar1b84e1c2008-07-10 15:55:27 +0200459config X86_VISWS
460 bool "SGI 320/540 (Visual Workstation)"
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800461 depends on X86_32 && PCI && X86_MPPARSE && PCI_GODIRECT
462 depends on X86_32_NON_STANDARD
463 ---help---
Ingo Molnar1b84e1c2008-07-10 15:55:27 +0200464 The SGI Visual Workstation series is an IA32-based workstation
465 based on SGI systems chips with some legacy PC hardware attached.
466
467 Say Y here to create a kernel to run on the SGI 320 or 540.
468
469 A kernel compiled for the Visual Workstation will run on general
470 PCs as well. See <file:Documentation/sgi-visws.txt> for details.
471
Ingo Molnar9c398012009-01-27 18:24:57 +0100472config X86_SUMMIT
473 bool "Summit/EXA (IBM x440)"
Ingo Molnare0c7ae32009-01-27 18:43:09 +0100474 depends on X86_32_NON_STANDARD
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100475 ---help---
Ingo Molnar9c398012009-01-27 18:24:57 +0100476 This option is needed for IBM systems that use the Summit/EXA chipset.
477 In particular, it is needed for the x440.
Ingo Molnar1f972762008-07-26 13:52:50 +0200478
Ingo Molnar9c398012009-01-27 18:24:57 +0100479config X86_ES7000
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800480 bool "Unisys ES7000 IA32 series"
Yinghai Lu26f7ef12009-01-29 14:19:22 -0800481 depends on X86_32_NON_STANDARD && X86_BIGSMP
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100482 ---help---
Ingo Molnar9c398012009-01-27 18:24:57 +0100483 Support for Unisys ES7000 systems. Say 'Y' here if this kernel is
484 supposed to run on an IA32-based Unisys ES7000 system.
485
Shérab82148d12010-09-25 06:06:57 +0200486config X86_32_IRIS
487 tristate "Eurobraille/Iris poweroff module"
488 depends on X86_32
489 ---help---
490 The Iris machines from EuroBraille do not have APM or ACPI support
491 to shut themselves down properly. A special I/O sequence is
492 needed to do so, which is what this module does at
493 kernel shutdown.
494
495 This is only for Iris machines from EuroBraille.
496
497 If unused, say N.
498
Ingo Molnarae1e9132008-11-11 09:05:16 +0100499config SCHED_OMIT_FRAME_POINTER
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100500 def_bool y
501 prompt "Single-depth WCHAN output"
Ken Chena87d0912008-11-06 11:10:49 -0800502 depends on X86
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100503 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100504 Calculate simpler /proc/<PID>/wchan values. If this option
505 is disabled then wchan values will recurse back to the
506 caller function. This provides more accurate wchan values,
507 at the expense of slightly more scheduling overhead.
508
509 If in doubt, say "Y".
510
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100511menuconfig PARAVIRT_GUEST
512 bool "Paravirtualized guest support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100513 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100514 Say Y here to get to see options related to running Linux under
515 various hypervisors. This option alone does not add any kernel code.
516
517 If you say N, all options in this submenu will be skipped and disabled.
518
519if PARAVIRT_GUEST
520
521source "arch/x86/xen/Kconfig"
522
Glauber de Oliveira Costa790c73f2008-02-15 17:52:48 -0200523config KVM_CLOCK
524 bool "KVM paravirtualized clock"
525 select PARAVIRT
Gerd Hoffmannf6e16d52008-06-03 16:17:32 +0200526 select PARAVIRT_CLOCK
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100527 ---help---
Glauber de Oliveira Costa790c73f2008-02-15 17:52:48 -0200528 Turning on this option will allow you to run a paravirtualized clock
529 when running over the KVM hypervisor. Instead of relying on a PIT
530 (or probably other) emulation by the underlying device model, the host
531 provides the guest with timing infrastructure such as time of day, and
532 system time
533
Marcelo Tosatti0cf1bfd2008-02-22 12:21:36 -0500534config KVM_GUEST
535 bool "KVM Guest support"
536 select PARAVIRT
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100537 ---help---
538 This option enables various optimizations for running under the KVM
539 hypervisor.
Marcelo Tosatti0cf1bfd2008-02-22 12:21:36 -0500540
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100541source "arch/x86/lguest/Kconfig"
542
Eduardo Pereira Habkoste61bd942008-01-30 13:33:32 +0100543config PARAVIRT
544 bool "Enable paravirtualization code"
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100545 ---help---
Eduardo Pereira Habkoste61bd942008-01-30 13:33:32 +0100546 This changes the kernel so it can modify itself when it is run
547 under a hypervisor, potentially improving performance significantly
548 over full virtualization. However, when run without a hypervisor
549 the kernel is theoretically slower and slightly larger.
550
Jeremy Fitzhardingeb4ecc122009-05-13 17:16:55 -0700551config PARAVIRT_SPINLOCKS
552 bool "Paravirtualization layer for spinlocks"
553 depends on PARAVIRT && SMP && EXPERIMENTAL
554 ---help---
555 Paravirtualized spinlocks allow a pvops backend to replace the
556 spinlock implementation with something virtualization-friendly
557 (for example, block the virtual CPU rather than spinning).
558
559 Unfortunately the downside is an up to 5% performance hit on
560 native kernels, with various workloads.
561
562 If you are unsure how to answer this question, answer N.
563
Gerd Hoffmann7af192c2008-06-03 16:17:29 +0200564config PARAVIRT_CLOCK
565 bool
Gerd Hoffmann7af192c2008-06-03 16:17:29 +0200566
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100567endif
568
Jeremy Fitzhardinge97349132008-06-25 00:19:14 -0400569config PARAVIRT_DEBUG
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100570 bool "paravirt-ops debugging"
571 depends on PARAVIRT && DEBUG_KERNEL
572 ---help---
573 Enable to debug paravirt_ops internals. Specifically, BUG if
574 a paravirt_op is missing when it is called.
Jeremy Fitzhardinge97349132008-06-25 00:19:14 -0400575
Yinghai Lu08677212010-02-10 01:20:20 -0800576config NO_BOOTMEM
Yinghai Lu774ea0b2010-08-25 13:39:18 -0700577 def_bool y
Yinghai Lu08677212010-02-10 01:20:20 -0800578
Yinghai Lu03273182008-04-18 17:49:15 -0700579config MEMTEST
580 bool "Memtest"
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100581 ---help---
Yinghai Luc64df702008-03-21 18:56:19 -0700582 This option adds a kernel parameter 'memtest', which allows memtest
Yinghai Lu03273182008-04-18 17:49:15 -0700583 to be set.
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100584 memtest=0, mean disabled; -- default
585 memtest=1, mean do 1 test pattern;
586 ...
587 memtest=4, mean do 4 test patterns.
Thomas Gleixneraba37282008-07-15 14:48:48 +0200588 If you are unsure how to answer this question, answer N.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100589
590config X86_SUMMIT_NUMA
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100591 def_bool y
Ingo Molnare0c7ae32009-01-27 18:43:09 +0100592 depends on X86_32 && NUMA && X86_32_NON_STANDARD
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100593
594config X86_CYCLONE_TIMER
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100595 def_bool y
Ingo Molnare0c7ae32009-01-27 18:43:09 +0100596 depends on X86_32_NON_STANDARD
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100597
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100598source "arch/x86/Kconfig.cpu"
599
600config HPET_TIMER
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100601 def_bool X86_64
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100602 prompt "HPET Timer Support" if X86_32
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100603 ---help---
604 Use the IA-PC HPET (High Precision Event Timer) to manage
605 time in preference to the PIT and RTC, if a HPET is
606 present.
607 HPET is the next generation timer replacing legacy 8254s.
608 The HPET provides a stable time base on SMP
609 systems, unlike the TSC, but it is more expensive to access,
610 as it is off-chip. You can find the HPET spec at
611 <http://www.intel.com/hardwaredesign/hpetspec_1.pdf>.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100612
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100613 You can safely choose Y here. However, HPET will only be
614 activated if the platform and the BIOS support this feature.
615 Otherwise the 8254 will be used for timing services.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100616
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100617 Choose N to continue using the legacy 8254 timer.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100618
619config HPET_EMULATE_RTC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100620 def_bool y
Bernhard Walle9d8af782008-02-06 01:38:52 -0800621 depends on HPET_TIMER && (RTC=y || RTC=m || RTC_DRV_CMOS=m || RTC_DRV_CMOS=y)
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100622
Jacob Panbb24c472009-09-02 07:37:17 -0700623config APB_TIMER
624 def_bool y if MRST
625 prompt "Langwell APB Timer Support" if X86_MRST
626 help
627 APB timer is the replacement for 8254, HPET on X86 MID platforms.
628 The APBT provides a stable time base on SMP
629 systems, unlike the TSC, but it is more expensive to access,
630 as it is off-chip. APB timers are always running regardless of CPU
631 C states, they are used as per CPU clockevent device when possible.
632
David Rientjes6a108a12011-01-20 14:44:16 -0800633# Mark as expert because too many people got it wrong.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100634# The code disables itself when not needed.
Thomas Petazzoni7ae93922008-04-28 02:14:14 -0700635config DMI
636 default y
David Rientjes6a108a12011-01-20 14:44:16 -0800637 bool "Enable DMI scanning" if EXPERT
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100638 ---help---
Thomas Petazzoni7ae93922008-04-28 02:14:14 -0700639 Enabled scanning of DMI to identify machine quirks. Say Y
640 here unless you have verified that your setup is not
641 affected by entries in the DMI blacklist. Required by PNP
642 BIOS code.
643
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100644config GART_IOMMU
David Rientjes6a108a12011-01-20 14:44:16 -0800645 bool "GART IOMMU support" if EXPERT
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100646 default y
647 select SWIOTLB
Andreas Herrmann23ac4ae2010-09-17 18:03:43 +0200648 depends on X86_64 && PCI && AMD_NB
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100649 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100650 Support for full DMA access of devices with 32bit memory access only
651 on systems with more than 3GB. This is usually needed for USB,
652 sound, many IDE/SATA chipsets and some other devices.
653 Provides a driver for the AMD Athlon64/Opteron/Turion/Sempron GART
654 based hardware IOMMU and a software bounce buffer based IOMMU used
655 on Intel systems and as fallback.
656 The code is only active when needed (enough memory and limited
657 device) unless CONFIG_IOMMU_DEBUG or iommu=force is specified
658 too.
659
660config CALGARY_IOMMU
661 bool "IBM Calgary IOMMU support"
662 select SWIOTLB
663 depends on X86_64 && PCI && EXPERIMENTAL
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100664 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100665 Support for hardware IOMMUs in IBM's xSeries x366 and x460
666 systems. Needed to run systems with more than 3GB of memory
667 properly with 32-bit PCI devices that do not support DAC
668 (Double Address Cycle). Calgary also supports bus level
669 isolation, where all DMAs pass through the IOMMU. This
670 prevents them from going anywhere except their intended
671 destination. This catches hard-to-find kernel bugs and
672 mis-behaving drivers and devices that do not use the DMA-API
673 properly to set up their DMA buffers. The IOMMU can be
674 turned off at boot time with the iommu=off parameter.
675 Normally the kernel will make the right choice by itself.
676 If unsure, say Y.
677
678config CALGARY_IOMMU_ENABLED_BY_DEFAULT
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100679 def_bool y
680 prompt "Should Calgary be enabled by default?"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100681 depends on CALGARY_IOMMU
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100682 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100683 Should Calgary be enabled by default? if you choose 'y', Calgary
684 will be used (if it exists). If you choose 'n', Calgary will not be
685 used even if it exists. If you choose 'n' and would like to use
686 Calgary anyway, pass 'iommu=calgary' on the kernel command line.
687 If unsure, say Y.
688
Joerg Roedel2b188722008-06-26 21:27:37 +0200689config AMD_IOMMU
690 bool "AMD IOMMU support"
Ingo Molnar07c40e82008-06-27 11:31:28 +0200691 select SWIOTLB
Joerg Roedela80dc3e2008-09-11 16:51:41 +0200692 select PCI_MSI
Ingo Molnar24d2ba02008-06-27 10:37:03 +0200693 depends on X86_64 && PCI && ACPI
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100694 ---help---
Joerg Roedel18d22202008-07-03 19:35:06 +0200695 With this option you can enable support for AMD IOMMU hardware in
696 your system. An IOMMU is a hardware component which provides
697 remapping of DMA memory accesses from devices. With an AMD IOMMU you
698 can isolate the the DMA memory of different devices and protect the
699 system from misbehaving device drivers or hardware.
700
701 You can find out if your system has an AMD IOMMU if you look into
702 your BIOS for an option to enable it or if you have an IVRS ACPI
703 table.
Joerg Roedel2b188722008-06-26 21:27:37 +0200704
Joerg Roedel2e117602008-12-11 19:00:12 +0100705config AMD_IOMMU_STATS
706 bool "Export AMD IOMMU statistics to debugfs"
707 depends on AMD_IOMMU
708 select DEBUG_FS
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100709 ---help---
Joerg Roedel2e117602008-12-11 19:00:12 +0100710 This option enables code in the AMD IOMMU driver to collect various
711 statistics about whats happening in the driver and exports that
712 information to userspace via debugfs.
713 If unsure, say N.
714
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100715# need this always selected by IOMMU for the VIA workaround
716config SWIOTLB
Joerg Roedela1afd012008-11-18 12:44:21 +0100717 def_bool y if X86_64
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100718 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100719 Support for software bounce buffers used on x86-64 systems
720 which don't have a hardware IOMMU (e.g. the current generation
721 of Intel's x86-64 CPUs). Using this PCI devices which can only
722 access 32-bits of memory can be used on systems with more than
723 3 GB of memory. If unsure, say Y.
724
FUJITA Tomonoria8522502008-04-29 00:59:36 -0700725config IOMMU_HELPER
FUJITA Tomonori18b743d2008-07-10 09:50:50 +0900726 def_bool (CALGARY_IOMMU || GART_IOMMU || SWIOTLB || AMD_IOMMU)
Linus Torvaldsd25e26b2008-08-25 14:15:38 -0700727
Joerg Roedel1aaf1182008-11-26 17:25:13 +0100728config IOMMU_API
729 def_bool (AMD_IOMMU || DMAR)
730
Mike Travis1184dc22008-05-12 21:21:12 +0200731config MAXSMP
Samuel Thibaultddb0c5a2010-08-21 21:32:41 +0200732 bool "Enable Maximum number of SMP Processors and NUMA Nodes"
Mike Travis36f51012008-12-16 17:33:51 -0800733 depends on X86_64 && SMP && DEBUG_KERNEL && EXPERIMENTAL
734 select CPUMASK_OFFSTACK
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100735 ---help---
Samuel Thibaultddb0c5a2010-08-21 21:32:41 +0200736 Enable maximum number of CPUS and NUMA Nodes for this architecture.
Mike Travis1184dc22008-05-12 21:21:12 +0200737 If unsure, say N.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100738
739config NR_CPUS
Mike Travis36f51012008-12-16 17:33:51 -0800740 int "Maximum number of CPUs" if SMP && !MAXSMP
Michael K. Johnson2a3313f2009-04-21 21:44:48 -0400741 range 2 8 if SMP && X86_32 && !X86_BIGSMP
Mike Travis36f51012008-12-16 17:33:51 -0800742 range 2 512 if SMP && !MAXSMP
Mike Travis78637a972008-12-16 17:34:00 -0800743 default "1" if !SMP
Linus Torvaldsd25e26b2008-08-25 14:15:38 -0700744 default "4096" if MAXSMP
Mike Travis78637a972008-12-16 17:34:00 -0800745 default "32" if SMP && (X86_NUMAQ || X86_SUMMIT || X86_BIGSMP || X86_ES7000)
746 default "8" if SMP
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100747 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100748 This allows you to specify the maximum number of CPUs which this
Linus Torvaldsd25e26b2008-08-25 14:15:38 -0700749 kernel will support. The maximum supported value is 512 and the
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100750 minimum value which makes sense is 2.
751
752 This is purely to save memory - each supported CPU adds
753 approximately eight kilobytes to the kernel image.
754
755config SCHED_SMT
756 bool "SMT (Hyperthreading) scheduler support"
Hiroshi Shimamotob089c122008-02-27 13:16:30 -0800757 depends on X86_HT
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100758 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100759 SMT scheduler support improves the CPU scheduler's decision making
760 when dealing with Intel Pentium 4 chips with HyperThreading at a
761 cost of slightly increased overhead in some places. If unsure say
762 N here.
763
764config SCHED_MC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100765 def_bool y
766 prompt "Multi-core scheduler support"
Hiroshi Shimamotob089c122008-02-27 13:16:30 -0800767 depends on X86_HT
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100768 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100769 Multi-core scheduler support improves the CPU scheduler's decision
770 making when dealing with multi-core CPU chips at a cost of slightly
771 increased overhead in some places. If unsure say N here.
772
Venkatesh Pallipadie82b8e42010-10-04 17:03:20 -0700773config IRQ_TIME_ACCOUNTING
774 bool "Fine granularity task level IRQ time accounting"
775 default n
776 ---help---
777 Select this option to enable fine granularity task irq time
778 accounting. This is done by reading a timestamp on each
779 transitions between softirq and hardirq state, so there can be a
780 small performance impact.
781
782 If in doubt, say N here.
783
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100784source "kernel/Kconfig.preempt"
785
786config X86_UP_APIC
787 bool "Local APIC support on uniprocessors"
Ingo Molnare0c7ae32009-01-27 18:43:09 +0100788 depends on X86_32 && !SMP && !X86_32_NON_STANDARD
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100789 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100790 A local APIC (Advanced Programmable Interrupt Controller) is an
791 integrated interrupt controller in the CPU. If you have a single-CPU
792 system which has a processor with a local APIC, you can say Y here to
793 enable and use it. If you say Y here even though your machine doesn't
794 have a local APIC, then the kernel will still run with no slowdown at
795 all. The local APIC supports CPU-generated self-interrupts (timer,
796 performance counters), and the NMI watchdog which detects hard
797 lockups.
798
799config X86_UP_IOAPIC
800 bool "IO-APIC support on uniprocessors"
801 depends on X86_UP_APIC
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100802 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100803 An IO-APIC (I/O Advanced Programmable Interrupt Controller) is an
804 SMP-capable replacement for PC-style interrupt controllers. Most
805 SMP systems and many recent uniprocessor systems have one.
806
807 If you have a single-CPU system with an IO-APIC, you can say Y here
808 to use it. If you say Y here even though your machine doesn't have
809 an IO-APIC, then the kernel will still run with no slowdown at all.
810
811config X86_LOCAL_APIC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100812 def_bool y
Ingo Molnare0c7ae32009-01-27 18:43:09 +0100813 depends on X86_64 || SMP || X86_32_NON_STANDARD || X86_UP_APIC
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100814
815config X86_IO_APIC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100816 def_bool y
Henrik Kretzschmar1444e0c2011-02-22 15:38:07 +0100817 depends on X86_64 || SMP || X86_32_NON_STANDARD || X86_UP_IOAPIC
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100818
819config X86_VISWS_APIC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100820 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100821 depends on X86_32 && X86_VISWS
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100822
Stefan Assmann41b9eb22008-07-15 13:48:55 +0200823config X86_REROUTE_FOR_BROKEN_BOOT_IRQS
824 bool "Reroute for broken boot IRQs"
Stefan Assmann41b9eb22008-07-15 13:48:55 +0200825 depends on X86_IO_APIC
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100826 ---help---
Stefan Assmann41b9eb22008-07-15 13:48:55 +0200827 This option enables a workaround that fixes a source of
828 spurious interrupts. This is recommended when threaded
829 interrupt handling is used on systems where the generation of
830 superfluous "boot interrupts" cannot be disabled.
831
832 Some chipsets generate a legacy INTx "boot IRQ" when the IRQ
833 entry in the chipset's IO-APIC is masked (as, e.g. the RT
834 kernel does during interrupt handling). On chipsets where this
835 boot IRQ generation cannot be disabled, this workaround keeps
836 the original IRQ line masked so that only the equivalent "boot
837 IRQ" is delivered to the CPUs. The workaround also tells the
838 kernel to set up the IRQ handler on the boot IRQ line. In this
839 way only one interrupt is delivered to the kernel. Otherwise
840 the spurious second interrupt may cause the kernel to bring
841 down (vital) interrupt lines.
842
843 Only affects "broken" chipsets. Interrupt sharing may be
844 increased on these systems.
845
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100846config X86_MCE
Andi Kleenbab9bc62009-07-09 00:31:38 +0200847 bool "Machine Check / overheating reporting"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100848 ---help---
Andi Kleenbab9bc62009-07-09 00:31:38 +0200849 Machine Check support allows the processor to notify the
850 kernel if it detects a problem (e.g. overheating, data corruption).
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100851 The action the kernel takes depends on the severity of the problem,
Andi Kleenbab9bc62009-07-09 00:31:38 +0200852 ranging from warning messages to halting the machine.
Andi Kleen4efc0672009-04-28 19:07:31 +0200853
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100854config X86_MCE_INTEL
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100855 def_bool y
856 prompt "Intel MCE features"
Andi Kleenc1ebf832009-07-09 00:31:41 +0200857 depends on X86_MCE && X86_LOCAL_APIC
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100858 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100859 Additional support for intel specific MCE features such as
860 the thermal monitor.
861
862config X86_MCE_AMD
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100863 def_bool y
864 prompt "AMD MCE features"
Andi Kleenc1ebf832009-07-09 00:31:41 +0200865 depends on X86_MCE && X86_LOCAL_APIC
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100866 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100867 Additional support for AMD specific MCE features such as
868 the DRAM Error Threshold.
869
Andi Kleen4efc0672009-04-28 19:07:31 +0200870config X86_ANCIENT_MCE
Jan Beulich6fc108a2010-04-21 15:23:44 +0100871 bool "Support for old Pentium 5 / WinChip machine checks"
Andi Kleenc31d9632009-07-09 00:31:37 +0200872 depends on X86_32 && X86_MCE
Hidetoshi Setocd13adcc2009-05-27 16:57:31 +0900873 ---help---
874 Include support for machine check handling on old Pentium 5 or WinChip
875 systems. These typically need to be enabled explicitely on the command
876 line.
Andi Kleen4efc0672009-04-28 19:07:31 +0200877
Andi Kleenb2762682009-02-12 13:49:31 +0100878config X86_MCE_THRESHOLD
879 depends on X86_MCE_AMD || X86_MCE_INTEL
Jan Beulich6fc108a2010-04-21 15:23:44 +0100880 def_bool y
Andi Kleenb2762682009-02-12 13:49:31 +0100881
Andi Kleenea149b32009-04-29 19:31:00 +0200882config X86_MCE_INJECT
Andi Kleenc1ebf832009-07-09 00:31:41 +0200883 depends on X86_MCE
Andi Kleenea149b32009-04-29 19:31:00 +0200884 tristate "Machine check injector support"
885 ---help---
886 Provide support for injecting machine checks for testing purposes.
887 If you don't know what a machine check is and you don't do kernel
888 QA it is safe to say n.
889
Andi Kleen4efc0672009-04-28 19:07:31 +0200890config X86_THERMAL_VECTOR
891 def_bool y
Andi Kleen5bb38ad2009-07-09 00:31:39 +0200892 depends on X86_MCE_INTEL
Andi Kleen4efc0672009-04-28 19:07:31 +0200893
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100894config VM86
David Rientjes6a108a12011-01-20 14:44:16 -0800895 bool "Enable VM86 support" if EXPERT
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100896 default y
897 depends on X86_32
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100898 ---help---
899 This option is required by programs like DOSEMU to run 16-bit legacy
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100900 code on X86 processors. It also may be needed by software like
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100901 XFree86 to initialize some video cards via BIOS. Disabling this
902 option saves about 6k.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100903
904config TOSHIBA
905 tristate "Toshiba Laptop support"
906 depends on X86_32
907 ---help---
908 This adds a driver to safely access the System Management Mode of
909 the CPU on Toshiba portables with a genuine Toshiba BIOS. It does
910 not work on models with a Phoenix BIOS. The System Management Mode
911 is used to set the BIOS and power saving options on Toshiba portables.
912
913 For information on utilities to make use of this driver see the
914 Toshiba Linux utilities web site at:
915 <http://www.buzzard.org.uk/toshiba/>.
916
917 Say Y if you intend to run this kernel on a Toshiba portable.
918 Say N otherwise.
919
920config I8K
921 tristate "Dell laptop support"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100922 ---help---
923 This adds a driver to safely access the System Management Mode
924 of the CPU on the Dell Inspiron 8000. The System Management Mode
925 is used to read cpu temperature and cooling fan status and to
926 control the fans on the I8K portables.
927
928 This driver has been tested only on the Inspiron 8000 but it may
929 also work with other Dell laptops. You can force loading on other
930 models by passing the parameter `force=1' to the module. Use at
931 your own risk.
932
933 For information on utilities to make use of this driver see the
934 I8K Linux utilities web site at:
935 <http://people.debian.org/~dz/i8k/>
936
937 Say Y if you intend to run this kernel on a Dell Inspiron 8000.
938 Say N otherwise.
939
940config X86_REBOOTFIXUPS
Jan Beulich9ba16082008-10-15 22:01:38 -0700941 bool "Enable X86 board specific fixups for reboot"
942 depends on X86_32
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100943 ---help---
944 This enables chipset and/or board specific fixups to be done
945 in order to get reboot to work correctly. This is only needed on
946 some combinations of hardware and BIOS. The symptom, for which
947 this config is intended, is when reboot ends with a stalled/hung
948 system.
949
950 Currently, the only fixup is for the Geode machines using
Florian Fainelli5e3a77e2008-01-30 13:33:36 +0100951 CS5530A and CS5536 chipsets and the RDC R-321x SoC.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100952
953 Say Y if you want to enable the fixup. Currently, it's safe to
954 enable this option even if you don't need it.
955 Say N otherwise.
956
957config MICROCODE
Peter Oruba8d86f392008-07-28 18:44:21 +0200958 tristate "/dev/cpu/microcode - microcode support"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100959 select FW_LOADER
960 ---help---
961 If you say Y here, you will be able to update the microcode on
Peter Oruba80cc9f12008-07-28 18:44:22 +0200962 certain Intel and AMD processors. The Intel support is for the
963 IA32 family, e.g. Pentium Pro, Pentium II, Pentium III,
964 Pentium 4, Xeon etc. The AMD support is for family 0x10 and
965 0x11 processors, e.g. Opteron, Phenom and Turion 64 Ultra.
966 You will obviously need the actual microcode binary data itself
967 which is not shipped with the Linux kernel.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100968
Peter Oruba8d86f392008-07-28 18:44:21 +0200969 This option selects the general module only, you need to select
970 at least one vendor specific module as well.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100971
972 To compile this driver as a module, choose M here: the
973 module will be called microcode.
974
Peter Oruba8d86f392008-07-28 18:44:21 +0200975config MICROCODE_INTEL
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100976 bool "Intel microcode patch loading support"
977 depends on MICROCODE
978 default MICROCODE
979 select FW_LOADER
980 ---help---
981 This options enables microcode patch loading support for Intel
982 processors.
Peter Oruba8d86f392008-07-28 18:44:21 +0200983
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100984 For latest news and information on obtaining all the required
985 Intel ingredients for this driver, check:
986 <http://www.urbanmyth.org/microcode/>.
Peter Oruba8d86f392008-07-28 18:44:21 +0200987
Peter Oruba80cc9f12008-07-28 18:44:22 +0200988config MICROCODE_AMD
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100989 bool "AMD microcode patch loading support"
990 depends on MICROCODE
991 select FW_LOADER
992 ---help---
993 If you select this option, microcode patch loading support for AMD
994 processors will be enabled.
Peter Oruba80cc9f12008-07-28 18:44:22 +0200995
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100996config MICROCODE_OLD_INTERFACE
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100997 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100998 depends on MICROCODE
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100999
1000config X86_MSR
1001 tristate "/dev/cpu/*/msr - Model-specific register support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001002 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001003 This device gives privileged processes access to the x86
1004 Model-Specific Registers (MSRs). It is a character device with
1005 major 202 and minors 0 to 31 for /dev/cpu/0/msr to /dev/cpu/31/msr.
1006 MSR accesses are directed to a specific CPU on multi-processor
1007 systems.
1008
1009config X86_CPUID
1010 tristate "/dev/cpu/*/cpuid - CPU information support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001011 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001012 This device gives processes access to the x86 CPUID instruction to
1013 be executed on a specific processor. It is a character device
1014 with major 203 and minors 0 to 31 for /dev/cpu/0/cpuid to
1015 /dev/cpu/31/cpuid.
1016
1017choice
1018 prompt "High Memory Support"
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001019 default HIGHMEM64G if X86_NUMAQ
Jan Beulich6fc108a2010-04-21 15:23:44 +01001020 default HIGHMEM4G
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001021 depends on X86_32
1022
1023config NOHIGHMEM
1024 bool "off"
1025 depends on !X86_NUMAQ
1026 ---help---
1027 Linux can use up to 64 Gigabytes of physical memory on x86 systems.
1028 However, the address space of 32-bit x86 processors is only 4
1029 Gigabytes large. That means that, if you have a large amount of
1030 physical memory, not all of it can be "permanently mapped" by the
1031 kernel. The physical memory that's not permanently mapped is called
1032 "high memory".
1033
1034 If you are compiling a kernel which will never run on a machine with
1035 more than 1 Gigabyte total physical RAM, answer "off" here (default
1036 choice and suitable for most users). This will result in a "3GB/1GB"
1037 split: 3GB are mapped so that each process sees a 3GB virtual memory
1038 space and the remaining part of the 4GB virtual memory space is used
1039 by the kernel to permanently map as much physical memory as
1040 possible.
1041
1042 If the machine has between 1 and 4 Gigabytes physical RAM, then
1043 answer "4GB" here.
1044
1045 If more than 4 Gigabytes is used then answer "64GB" here. This
1046 selection turns Intel PAE (Physical Address Extension) mode on.
1047 PAE implements 3-level paging on IA32 processors. PAE is fully
1048 supported by Linux, PAE mode is implemented on all recent Intel
1049 processors (Pentium Pro and better). NOTE: If you say "64GB" here,
1050 then the kernel will not boot on CPUs that don't support PAE!
1051
1052 The actual amount of total physical memory will either be
1053 auto detected or can be forced by using a kernel command line option
1054 such as "mem=256M". (Try "man bootparam" or see the documentation of
1055 your boot loader (lilo or loadlin) about how to pass options to the
1056 kernel at boot time.)
1057
1058 If unsure, say "off".
1059
1060config HIGHMEM4G
1061 bool "4GB"
1062 depends on !X86_NUMAQ
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001063 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001064 Select this if you have a 32-bit processor and between 1 and 4
1065 gigabytes of physical RAM.
1066
1067config HIGHMEM64G
1068 bool "64GB"
1069 depends on !M386 && !M486
1070 select X86_PAE
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001071 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001072 Select this if you have a 32-bit processor and more than 4
1073 gigabytes of physical RAM.
1074
1075endchoice
1076
1077choice
1078 depends on EXPERIMENTAL
David Rientjes6a108a12011-01-20 14:44:16 -08001079 prompt "Memory split" if EXPERT
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001080 default VMSPLIT_3G
1081 depends on X86_32
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001082 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001083 Select the desired split between kernel and user memory.
1084
1085 If the address range available to the kernel is less than the
1086 physical memory installed, the remaining memory will be available
1087 as "high memory". Accessing high memory is a little more costly
1088 than low memory, as it needs to be mapped into the kernel first.
1089 Note that increasing the kernel address space limits the range
1090 available to user programs, making the address space there
1091 tighter. Selecting anything other than the default 3G/1G split
1092 will also likely make your kernel incompatible with binary-only
1093 kernel modules.
1094
1095 If you are not absolutely sure what you are doing, leave this
1096 option alone!
1097
1098 config VMSPLIT_3G
1099 bool "3G/1G user/kernel split"
1100 config VMSPLIT_3G_OPT
1101 depends on !X86_PAE
1102 bool "3G/1G user/kernel split (for full 1G low memory)"
1103 config VMSPLIT_2G
1104 bool "2G/2G user/kernel split"
1105 config VMSPLIT_2G_OPT
1106 depends on !X86_PAE
1107 bool "2G/2G user/kernel split (for full 2G low memory)"
1108 config VMSPLIT_1G
1109 bool "1G/3G user/kernel split"
1110endchoice
1111
1112config PAGE_OFFSET
1113 hex
1114 default 0xB0000000 if VMSPLIT_3G_OPT
1115 default 0x80000000 if VMSPLIT_2G
1116 default 0x78000000 if VMSPLIT_2G_OPT
1117 default 0x40000000 if VMSPLIT_1G
1118 default 0xC0000000
1119 depends on X86_32
1120
1121config HIGHMEM
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001122 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001123 depends on X86_32 && (HIGHMEM64G || HIGHMEM4G)
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001124
1125config X86_PAE
Jan Beulich9ba16082008-10-15 22:01:38 -07001126 bool "PAE (Physical Address Extension) Support"
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001127 depends on X86_32 && !HIGHMEM4G
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001128 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001129 PAE is required for NX support, and furthermore enables
1130 larger swapspace support for non-overcommit purposes. It
1131 has the cost of more pagetable lookup overhead, and also
1132 consumes more pagetable space per process.
1133
Jeremy Fitzhardinge600715d2008-09-11 01:31:45 -07001134config ARCH_PHYS_ADDR_T_64BIT
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001135 def_bool X86_64 || X86_PAE
Jeremy Fitzhardinge600715d2008-09-11 01:31:45 -07001136
FUJITA Tomonori66f2b062010-10-20 15:55:35 -07001137config ARCH_DMA_ADDR_T_64BIT
1138 def_bool X86_64 || HIGHMEM64G
1139
Nick Piggin9e899812008-10-22 12:33:16 +02001140config DIRECT_GBPAGES
David Rientjes6a108a12011-01-20 14:44:16 -08001141 bool "Enable 1GB pages for kernel pagetables" if EXPERT
Nick Piggin9e899812008-10-22 12:33:16 +02001142 default y
1143 depends on X86_64
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001144 ---help---
Nick Piggin9e899812008-10-22 12:33:16 +02001145 Allow the kernel linear mapping to use 1GB pages on CPUs that
1146 support it. This can improve the kernel's performance a tiny bit by
1147 reducing TLB pressure. If in doubt, say "Y".
1148
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001149# Common NUMA Features
1150config NUMA
KOSAKI Motohirofd51b2d2008-11-05 02:27:19 +09001151 bool "Numa Memory Allocation and Scheduler Support"
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001152 depends on SMP
Rafael J. Wysocki604d2052008-11-12 23:26:14 +01001153 depends on X86_64 || (X86_32 && HIGHMEM64G && (X86_NUMAQ || X86_BIGSMP || X86_SUMMIT && ACPI) && EXPERIMENTAL)
Yinghai Lu0699eae2008-06-17 15:39:01 -07001154 default y if (X86_NUMAQ || X86_SUMMIT || X86_BIGSMP)
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001155 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001156 Enable NUMA (Non Uniform Memory Access) support.
KOSAKI Motohirofd51b2d2008-11-05 02:27:19 +09001157
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001158 The kernel will try to allocate memory used by a CPU on the
1159 local memory controller of the CPU and add some more
1160 NUMA awareness to the kernel.
1161
Ingo Molnarc280ea52008-11-08 13:29:45 +01001162 For 64-bit this is recommended if the system is Intel Core i7
KOSAKI Motohirofd51b2d2008-11-05 02:27:19 +09001163 (or later), AMD Opteron, or EM64T NUMA.
1164
1165 For 32-bit this is only needed on (rare) 32-bit-only platforms
1166 that support NUMA topologies, such as NUMAQ / Summit, or if you
1167 boot a 32-bit kernel on a 64-bit NUMA platform.
1168
1169 Otherwise, you should say N.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001170
1171comment "NUMA (Summit) requires SMP, 64GB highmem support, ACPI"
1172 depends on X86_32 && X86_SUMMIT && (!HIGHMEM64G || !ACPI)
1173
Hans Rosenfeldeec1d4f2010-10-29 17:14:30 +02001174config AMD_NUMA
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001175 def_bool y
1176 prompt "Old style AMD Opteron NUMA detection"
1177 depends on X86_64 && NUMA && PCI
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001178 ---help---
Hans Rosenfeldeec1d4f2010-10-29 17:14:30 +02001179 Enable AMD NUMA node topology detection. You should say Y here if
1180 you have a multi processor AMD system. This uses an old method to
1181 read the NUMA configuration directly from the builtin Northbridge
1182 of Opteron. It is recommended to use X86_64_ACPI_NUMA instead,
1183 which also takes priority if both are compiled in.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001184
1185config X86_64_ACPI_NUMA
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001186 def_bool y
1187 prompt "ACPI NUMA detection"
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001188 depends on X86_64 && NUMA && ACPI && PCI
1189 select ACPI_NUMA
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001190 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001191 Enable ACPI SRAT based node topology detection.
1192
Suresh Siddha6ec6e0d2008-03-25 10:14:35 -07001193# Some NUMA nodes have memory ranges that span
1194# other nodes. Even though a pfn is valid and
1195# between a node's start and end pfns, it may not
1196# reside on that node. See memmap_init_zone()
1197# for details.
1198config NODES_SPAN_OTHER_NODES
1199 def_bool y
1200 depends on X86_64_ACPI_NUMA
1201
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001202config NUMA_EMU
1203 bool "NUMA emulation"
1204 depends on X86_64 && NUMA
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001205 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001206 Enable NUMA emulation. A flat machine will be split
1207 into virtual nodes when booted with "numa=fake=N", where N is the
1208 number of nodes. This is only useful for debugging.
1209
1210config NODES_SHIFT
Linus Torvaldsd25e26b2008-08-25 14:15:38 -07001211 int "Maximum NUMA Nodes (as a power of 2)" if !MAXSMP
David Rientjes51591e32010-03-25 15:39:27 -07001212 range 1 10
1213 default "10" if MAXSMP
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001214 default "6" if X86_64
1215 default "4" if X86_NUMAQ
1216 default "3"
1217 depends on NEED_MULTIPLE_NODES
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001218 ---help---
Mike Travis1184dc22008-05-12 21:21:12 +02001219 Specify the maximum number of NUMA Nodes available on the target
Matt LaPlante692105b2009-01-26 11:12:25 +01001220 system. Increases memory reserved to accommodate various tables.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001221
Tejun Heoc1329372009-02-24 11:57:20 +09001222config HAVE_ARCH_BOOTMEM
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001223 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001224 depends on X86_32 && NUMA
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001225
1226config ARCH_HAVE_MEMORY_PRESENT
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001227 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001228 depends on X86_32 && DISCONTIGMEM
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001229
1230config NEED_NODE_MEMMAP_SIZE
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001231 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001232 depends on X86_32 && (DISCONTIGMEM || SPARSEMEM)
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001233
1234config HAVE_ARCH_ALLOC_REMAP
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001235 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001236 depends on X86_32 && NUMA
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001237
1238config ARCH_FLATMEM_ENABLE
1239 def_bool y
Jeff Chua99809962008-08-06 19:09:53 +08001240 depends on X86_32 && ARCH_SELECT_MEMORY_MODEL && !NUMA
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001241
1242config ARCH_DISCONTIGMEM_ENABLE
1243 def_bool y
Christoph Lameterb2632952008-01-30 13:30:47 +01001244 depends on NUMA && X86_32
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001245
1246config ARCH_DISCONTIGMEM_DEFAULT
1247 def_bool y
Christoph Lameterb2632952008-01-30 13:30:47 +01001248 depends on NUMA && X86_32
1249
KAMEZAWA Hiroyuki94925872009-09-22 16:45:45 -07001250config ARCH_PROC_KCORE_TEXT
1251 def_bool y
1252 depends on X86_64 && PROC_KCORE
1253
Christoph Lameterb2632952008-01-30 13:30:47 +01001254config ARCH_SPARSEMEM_DEFAULT
1255 def_bool y
1256 depends on X86_64
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001257
1258config ARCH_SPARSEMEM_ENABLE
1259 def_bool y
Yinghai Lu4272ebf2009-01-29 15:14:46 -08001260 depends on X86_64 || NUMA || (EXPERIMENTAL && X86_32) || X86_32_NON_STANDARD
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001261 select SPARSEMEM_STATIC if X86_32
1262 select SPARSEMEM_VMEMMAP_ENABLE if X86_64
1263
1264config ARCH_SELECT_MEMORY_MODEL
1265 def_bool y
Christoph Lameterb2632952008-01-30 13:30:47 +01001266 depends on ARCH_SPARSEMEM_ENABLE
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001267
1268config ARCH_MEMORY_PROBE
1269 def_bool X86_64
1270 depends on MEMORY_HOTPLUG
1271
Avi Kivitya29815a2010-01-10 16:28:09 +02001272config ILLEGAL_POINTER_VALUE
1273 hex
1274 default 0 if X86_32
1275 default 0xdead000000000000 if X86_64
1276
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001277source "mm/Kconfig"
1278
1279config HIGHPTE
1280 bool "Allocate 3rd-level pagetables from highmem"
Jan Beulich6fc108a2010-04-21 15:23:44 +01001281 depends on HIGHMEM
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001282 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001283 The VM uses one page table entry for each page of physical memory.
1284 For systems with a lot of RAM, this can be wasteful of precious
1285 low memory. Setting this option will put user-space page table
1286 entries in high memory.
1287
Jeremy Fitzhardinge9f077872008-09-07 01:51:34 -07001288config X86_CHECK_BIOS_CORRUPTION
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001289 bool "Check for low memory corruption"
1290 ---help---
1291 Periodically check for memory corruption in low memory, which
1292 is suspected to be caused by BIOS. Even when enabled in the
1293 configuration, it is disabled at runtime. Enable it by
1294 setting "memory_corruption_check=1" on the kernel command
1295 line. By default it scans the low 64k of memory every 60
1296 seconds; see the memory_corruption_check_size and
1297 memory_corruption_check_period parameters in
1298 Documentation/kernel-parameters.txt to adjust this.
Jeremy Fitzhardinge9f077872008-09-07 01:51:34 -07001299
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001300 When enabled with the default parameters, this option has
1301 almost no overhead, as it reserves a relatively small amount
1302 of memory and scans it infrequently. It both detects corruption
1303 and prevents it from affecting the running system.
Jeremy Fitzhardinge9f077872008-09-07 01:51:34 -07001304
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001305 It is, however, intended as a diagnostic tool; if repeatable
1306 BIOS-originated corruption always affects the same memory,
1307 you can use memmap= to prevent the kernel from using that
1308 memory.
Jeremy Fitzhardinge9f077872008-09-07 01:51:34 -07001309
Jeremy Fitzhardingec885df52008-09-07 02:37:32 -07001310config X86_BOOTPARAM_MEMORY_CORRUPTION_CHECK
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001311 bool "Set the default setting of memory_corruption_check"
Jeremy Fitzhardingec885df52008-09-07 02:37:32 -07001312 depends on X86_CHECK_BIOS_CORRUPTION
1313 default y
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001314 ---help---
1315 Set whether the default state of memory_corruption_check is
1316 on or off.
Jeremy Fitzhardingec885df52008-09-07 02:37:32 -07001317
H. Peter Anvin9ea77bd2010-08-25 16:38:20 -07001318config X86_RESERVE_LOW
H. Peter Anvind0cd7422010-08-24 17:32:04 -07001319 int "Amount of low memory, in kilobytes, to reserve for the BIOS"
1320 default 64
1321 range 4 640
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001322 ---help---
H. Peter Anvind0cd7422010-08-24 17:32:04 -07001323 Specify the amount of low memory to reserve for the BIOS.
Ingo Molnarfc381512008-09-16 10:07:34 +02001324
H. Peter Anvind0cd7422010-08-24 17:32:04 -07001325 The first page contains BIOS data structures that the kernel
1326 must not use, so that page must always be reserved.
Ingo Molnarfc381512008-09-16 10:07:34 +02001327
H. Peter Anvind0cd7422010-08-24 17:32:04 -07001328 By default we reserve the first 64K of physical RAM, as a
1329 number of BIOSes are known to corrupt that memory range
1330 during events such as suspend/resume or monitor cable
1331 insertion, so it must not be used by the kernel.
Ingo Molnarfc381512008-09-16 10:07:34 +02001332
H. Peter Anvind0cd7422010-08-24 17:32:04 -07001333 You can set this to 4 if you are absolutely sure that you
1334 trust the BIOS to get all its memory reservations and usages
1335 right. If you know your BIOS have problems beyond the
1336 default 64K area, you can set this to 640 to avoid using the
1337 entire low memory range.
1338
1339 If you have doubts about the BIOS (e.g. suspend/resume does
1340 not work or there's kernel crashes after certain hardware
1341 hotplug events) then you might want to enable
1342 X86_CHECK_BIOS_CORRUPTION=y to allow the kernel to check
1343 typical corruption patterns.
1344
1345 Leave this to the default value of 64 if you are unsure.
Ingo Molnarfc381512008-09-16 10:07:34 +02001346
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001347config MATH_EMULATION
1348 bool
1349 prompt "Math emulation" if X86_32
1350 ---help---
1351 Linux can emulate a math coprocessor (used for floating point
1352 operations) if you don't have one. 486DX and Pentium processors have
1353 a math coprocessor built in, 486SX and 386 do not, unless you added
1354 a 487DX or 387, respectively. (The messages during boot time can
1355 give you some hints here ["man dmesg"].) Everyone needs either a
1356 coprocessor or this emulation.
1357
1358 If you don't have a math coprocessor, you need to say Y here; if you
1359 say Y here even though you have a coprocessor, the coprocessor will
1360 be used nevertheless. (This behavior can be changed with the kernel
1361 command line option "no387", which comes handy if your coprocessor
1362 is broken. Try "man bootparam" or see the documentation of your boot
1363 loader (lilo or loadlin) about how to pass options to the kernel at
1364 boot time.) This means that it is a good idea to say Y here if you
1365 intend to use this kernel on different machines.
1366
1367 More information about the internals of the Linux math coprocessor
1368 emulation can be found in <file:arch/x86/math-emu/README>.
1369
1370 If you are not sure, say Y; apart from resulting in a 66 KB bigger
1371 kernel, it won't hurt.
1372
1373config MTRR
Jan Beulich6fc108a2010-04-21 15:23:44 +01001374 def_bool y
David Rientjes6a108a12011-01-20 14:44:16 -08001375 prompt "MTRR (Memory Type Range Register) support" if EXPERT
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001376 ---help---
1377 On Intel P6 family processors (Pentium Pro, Pentium II and later)
1378 the Memory Type Range Registers (MTRRs) may be used to control
1379 processor access to memory ranges. This is most useful if you have
1380 a video (VGA) card on a PCI or AGP bus. Enabling write-combining
1381 allows bus write transfers to be combined into a larger transfer
1382 before bursting over the PCI/AGP bus. This can increase performance
1383 of image write operations 2.5 times or more. Saying Y here creates a
1384 /proc/mtrr file which may be used to manipulate your processor's
1385 MTRRs. Typically the X server should use this.
1386
1387 This code has a reasonably generic interface so that similar
1388 control registers on other processors can be easily supported
1389 as well:
1390
1391 The Cyrix 6x86, 6x86MX and M II processors have Address Range
1392 Registers (ARRs) which provide a similar functionality to MTRRs. For
1393 these, the ARRs are used to emulate the MTRRs.
1394 The AMD K6-2 (stepping 8 and above) and K6-3 processors have two
1395 MTRRs. The Centaur C6 (WinChip) has 8 MCRs, allowing
1396 write-combining. All of these processors are supported by this code
1397 and it makes sense to say Y here if you have one of them.
1398
1399 Saying Y here also fixes a problem with buggy SMP BIOSes which only
1400 set the MTRRs for the boot CPU and not for the secondary CPUs. This
1401 can lead to all sorts of problems, so it's good to say Y here.
1402
1403 You can safely say Y even if your machine doesn't have MTRRs, you'll
1404 just add about 9 KB to your kernel.
1405
Randy Dunlap7225e752008-07-26 17:54:22 -07001406 See <file:Documentation/x86/mtrr.txt> for more information.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001407
Yinghai Lu95ffa242008-04-29 03:52:33 -07001408config MTRR_SANITIZER
Yinghai Lu2ffb3502008-09-30 16:29:40 -07001409 def_bool y
Yinghai Lu95ffa242008-04-29 03:52:33 -07001410 prompt "MTRR cleanup support"
1411 depends on MTRR
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001412 ---help---
Thomas Gleixneraba37282008-07-15 14:48:48 +02001413 Convert MTRR layout from continuous to discrete, so X drivers can
1414 add writeback entries.
Yinghai Lu95ffa242008-04-29 03:52:33 -07001415
Thomas Gleixneraba37282008-07-15 14:48:48 +02001416 Can be disabled with disable_mtrr_cleanup on the kernel command line.
Matt LaPlante692105b2009-01-26 11:12:25 +01001417 The largest mtrr entry size for a continuous block can be set with
Thomas Gleixneraba37282008-07-15 14:48:48 +02001418 mtrr_chunk_size.
Yinghai Lu95ffa242008-04-29 03:52:33 -07001419
Yinghai Lu2ffb3502008-09-30 16:29:40 -07001420 If unsure, say Y.
Yinghai Lu95ffa242008-04-29 03:52:33 -07001421
1422config MTRR_SANITIZER_ENABLE_DEFAULT
Yinghai Luf5098d62008-04-29 20:25:58 -07001423 int "MTRR cleanup enable value (0-1)"
1424 range 0 1
1425 default "0"
Yinghai Lu95ffa242008-04-29 03:52:33 -07001426 depends on MTRR_SANITIZER
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001427 ---help---
Yinghai Luf5098d62008-04-29 20:25:58 -07001428 Enable mtrr cleanup default value
Yinghai Lu95ffa242008-04-29 03:52:33 -07001429
Yinghai Lu12031a62008-05-02 02:40:22 -07001430config MTRR_SANITIZER_SPARE_REG_NR_DEFAULT
1431 int "MTRR cleanup spare reg num (0-7)"
1432 range 0 7
1433 default "1"
1434 depends on MTRR_SANITIZER
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001435 ---help---
Yinghai Lu12031a62008-05-02 02:40:22 -07001436 mtrr cleanup spare entries default, it can be changed via
Thomas Gleixneraba37282008-07-15 14:48:48 +02001437 mtrr_spare_reg_nr=N on the kernel command line.
Yinghai Lu12031a62008-05-02 02:40:22 -07001438
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001439config X86_PAT
Jan Beulich6fc108a2010-04-21 15:23:44 +01001440 def_bool y
David Rientjes6a108a12011-01-20 14:44:16 -08001441 prompt "x86 PAT support" if EXPERT
Ingo Molnar2a8a2712008-04-26 10:26:52 +02001442 depends on MTRR
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001443 ---help---
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001444 Use PAT attributes to setup page level cache control.
Venki Pallipadi042b78e2008-03-24 14:22:35 -07001445
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001446 PATs are the modern equivalents of MTRRs and are much more
1447 flexible than MTRRs.
1448
1449 Say N here if you see bootup problems (boot crash, boot hang,
Venki Pallipadi042b78e2008-03-24 14:22:35 -07001450 spontaneous reboots) or a non-working video driver.
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001451
1452 If unsure, say Y.
1453
Venkatesh Pallipadi46cf98c2009-07-10 09:57:37 -07001454config ARCH_USES_PG_UNCACHED
1455 def_bool y
1456 depends on X86_PAT
1457
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001458config EFI
Jan Beulich9ba16082008-10-15 22:01:38 -07001459 bool "EFI runtime service support"
Huang, Ying5b836832008-01-30 13:31:19 +01001460 depends on ACPI
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001461 ---help---
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001462 This enables the kernel to use EFI runtime services that are
1463 available (such as the EFI variable services).
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001464
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001465 This option is only useful on systems that have EFI firmware.
1466 In addition, you should use the latest ELILO loader available
1467 at <http://elilo.sourceforge.net> in order to take advantage
1468 of EFI runtime services. However, even with this option, the
1469 resultant kernel should continue to boot on existing non-EFI
1470 platforms.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001471
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001472config SECCOMP
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001473 def_bool y
1474 prompt "Enable seccomp to safely compute untrusted bytecode"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001475 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001476 This kernel feature is useful for number crunching applications
1477 that may need to compute untrusted bytecode during their
1478 execution. By using pipes or other transports made available to
1479 the process as file descriptors supporting the read/write
1480 syscalls, it's possible to isolate those applications in
1481 their own address space using seccomp. Once seccomp is
Alexey Dobriyan9c0bbee2008-09-09 11:01:31 +04001482 enabled via prctl(PR_SET_SECCOMP), it cannot be disabled
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001483 and the task is only allowed to execute a few safe syscalls
1484 defined by each seccomp mode.
1485
1486 If unsure, say Y. Only embedded should say N here.
1487
1488config CC_STACKPROTECTOR
1489 bool "Enable -fstack-protector buffer overflow detection (EXPERIMENTAL)"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001490 ---help---
1491 This option turns on the -fstack-protector GCC feature. This
Ingo Molnar113c5412008-02-14 10:36:03 +01001492 feature puts, at the beginning of functions, a canary value on
1493 the stack just before the return address, and validates
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001494 the value just before actually returning. Stack based buffer
1495 overflows (that need to overwrite this return address) now also
1496 overwrite the canary, which gets detected and the attack is then
1497 neutralized via a kernel panic.
1498
1499 This feature requires gcc version 4.2 or above, or a distribution
1500 gcc with the feature backported. Older versions are automatically
Ingo Molnar113c5412008-02-14 10:36:03 +01001501 detected and for those versions, this configuration option is
1502 ignored. (and a warning is printed during bootup)
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001503
1504source kernel/Kconfig.hz
1505
1506config KEXEC
1507 bool "kexec system call"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001508 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001509 kexec is a system call that implements the ability to shutdown your
1510 current kernel, and to start another kernel. It is like a reboot
1511 but it is independent of the system firmware. And like a reboot
1512 you can start any kernel with it, not just Linux.
1513
1514 The name comes from the similarity to the exec system call.
1515
1516 It is an ongoing process to be certain the hardware in a machine
1517 is properly shutdown, so do not be surprised if this code does not
1518 initially work for you. It may help to enable device hotplugging
1519 support. As of this writing the exact hardware interface is
1520 strongly in flux, so no good recommendation can be made.
1521
1522config CRASH_DUMP
Pavel Machek04b69442008-08-14 17:16:50 +02001523 bool "kernel crash dumps"
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001524 depends on X86_64 || (X86_32 && HIGHMEM)
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001525 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001526 Generate crash dump after being started by kexec.
1527 This should be normally only set in special crash dump kernels
1528 which are loaded in the main kernel with kexec-tools into
1529 a specially reserved region and then later executed after
1530 a crash by kdump/kexec. The crash dump kernel must be compiled
1531 to a memory address not used by the main kernel or BIOS using
1532 PHYSICAL_START, or it must be built as a relocatable image
1533 (CONFIG_RELOCATABLE=y).
1534 For more details see Documentation/kdump/kdump.txt
1535
Huang Ying3ab83522008-07-25 19:45:07 -07001536config KEXEC_JUMP
1537 bool "kexec jump (EXPERIMENTAL)"
1538 depends on EXPERIMENTAL
Huang Yingfee7b0d2009-03-10 10:57:16 +08001539 depends on KEXEC && HIBERNATION
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001540 ---help---
Huang Ying89081d12008-07-25 19:45:10 -07001541 Jump between original kernel and kexeced kernel and invoke
1542 code in physical address mode via KEXEC
Huang Ying3ab83522008-07-25 19:45:07 -07001543
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001544config PHYSICAL_START
David Rientjes6a108a12011-01-20 14:44:16 -08001545 hex "Physical address where the kernel is loaded" if (EXPERT || CRASH_DUMP)
H. Peter Anvinceefccc2009-05-11 16:12:16 -07001546 default "0x1000000"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001547 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001548 This gives the physical address where the kernel is loaded.
1549
1550 If kernel is a not relocatable (CONFIG_RELOCATABLE=n) then
1551 bzImage will decompress itself to above physical address and
1552 run from there. Otherwise, bzImage will run from the address where
1553 it has been loaded by the boot loader and will ignore above physical
1554 address.
1555
1556 In normal kdump cases one does not have to set/change this option
1557 as now bzImage can be compiled as a completely relocatable image
1558 (CONFIG_RELOCATABLE=y) and be used to load and run from a different
1559 address. This option is mainly useful for the folks who don't want
1560 to use a bzImage for capturing the crash dump and want to use a
1561 vmlinux instead. vmlinux is not relocatable hence a kernel needs
1562 to be specifically compiled to run from a specific memory area
1563 (normally a reserved region) and this option comes handy.
1564
H. Peter Anvinceefccc2009-05-11 16:12:16 -07001565 So if you are using bzImage for capturing the crash dump,
1566 leave the value here unchanged to 0x1000000 and set
1567 CONFIG_RELOCATABLE=y. Otherwise if you plan to use vmlinux
1568 for capturing the crash dump change this value to start of
1569 the reserved region. In other words, it can be set based on
1570 the "X" value as specified in the "crashkernel=YM@XM"
1571 command line boot parameter passed to the panic-ed
1572 kernel. Please take a look at Documentation/kdump/kdump.txt
1573 for more details about crash dumps.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001574
1575 Usage of bzImage for capturing the crash dump is recommended as
1576 one does not have to build two kernels. Same kernel can be used
1577 as production kernel and capture kernel. Above option should have
1578 gone away after relocatable bzImage support is introduced. But it
1579 is present because there are users out there who continue to use
1580 vmlinux for dump capture. This option should go away down the
1581 line.
1582
1583 Don't change this unless you know what you are doing.
1584
1585config RELOCATABLE
H. Peter Anvin26717802009-05-07 14:19:34 -07001586 bool "Build a relocatable kernel"
1587 default y
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001588 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001589 This builds a kernel image that retains relocation information
1590 so it can be loaded someplace besides the default 1MB.
1591 The relocations tend to make the kernel binary about 10% larger,
1592 but are discarded at runtime.
1593
1594 One use is for the kexec on panic case where the recovery kernel
1595 must live at a different physical address than the primary
1596 kernel.
1597
1598 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
1599 it has been loaded at and the compile time physical address
1600 (CONFIG_PHYSICAL_START) is ignored.
1601
H. Peter Anvin845adf72009-05-05 21:20:51 -07001602# Relocation on x86-32 needs some additional build support
1603config X86_NEED_RELOCS
1604 def_bool y
1605 depends on X86_32 && RELOCATABLE
1606
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001607config PHYSICAL_ALIGN
Jan Beulich6fc108a2010-04-21 15:23:44 +01001608 hex "Alignment value to which kernel should be aligned" if X86_32
H. Peter Anvinceefccc2009-05-11 16:12:16 -07001609 default "0x1000000"
1610 range 0x2000 0x1000000
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001611 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001612 This value puts the alignment restrictions on physical address
1613 where kernel is loaded and run from. Kernel is compiled for an
1614 address which meets above alignment restriction.
1615
1616 If bootloader loads the kernel at a non-aligned address and
1617 CONFIG_RELOCATABLE is set, kernel will move itself to nearest
1618 address aligned to above value and run from there.
1619
1620 If bootloader loads the kernel at a non-aligned address and
1621 CONFIG_RELOCATABLE is not set, kernel will ignore the run time
1622 load address and decompress itself to the address it has been
1623 compiled for and run from there. The address for which kernel is
1624 compiled already meets above alignment restrictions. Hence the
1625 end result is that kernel runs from a physical address meeting
1626 above alignment restrictions.
1627
1628 Don't change this unless you know what you are doing.
1629
1630config HOTPLUG_CPU
Dimitri Sivanich7c13e6a2008-08-11 10:46:46 -05001631 bool "Support for hot-pluggable CPUs"
Ingo Molnar4b19ed912009-01-27 17:47:24 +01001632 depends on SMP && HOTPLUG
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001633 ---help---
Dimitri Sivanich7c13e6a2008-08-11 10:46:46 -05001634 Say Y here to allow turning CPUs off and on. CPUs can be
1635 controlled through /sys/devices/system/cpu.
1636 ( Note: power management support will enable this option
1637 automatically on SMP systems. )
1638 Say N if you want to disable CPU hotplug.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001639
1640config COMPAT_VDSO
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001641 def_bool y
1642 prompt "Compat VDSO support"
Roland McGrathaf65d642008-01-30 13:30:43 +01001643 depends on X86_32 || IA32_EMULATION
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001644 ---help---
Roland McGrathaf65d642008-01-30 13:30:43 +01001645 Map the 32-bit VDSO to the predictable old-style address too.
Randy Dunlape84446d2009-11-10 15:46:52 -08001646
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001647 Say N here if you are running a sufficiently recent glibc
1648 version (2.3.3 or later), to remove the high-mapped
1649 VDSO mapping and to exclusively use the randomized VDSO.
1650
1651 If unsure, say Y.
1652
Tim Bird516cbf32008-08-12 12:52:36 -07001653config CMDLINE_BOOL
1654 bool "Built-in kernel command line"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001655 ---help---
Tim Bird516cbf32008-08-12 12:52:36 -07001656 Allow for specifying boot arguments to the kernel at
1657 build time. On some systems (e.g. embedded ones), it is
1658 necessary or convenient to provide some or all of the
1659 kernel boot arguments with the kernel itself (that is,
1660 to not rely on the boot loader to provide them.)
1661
1662 To compile command line arguments into the kernel,
1663 set this option to 'Y', then fill in the
1664 the boot arguments in CONFIG_CMDLINE.
1665
1666 Systems with fully functional boot loaders (i.e. non-embedded)
1667 should leave this option set to 'N'.
1668
1669config CMDLINE
1670 string "Built-in kernel command string"
1671 depends on CMDLINE_BOOL
1672 default ""
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001673 ---help---
Tim Bird516cbf32008-08-12 12:52:36 -07001674 Enter arguments here that should be compiled into the kernel
1675 image and used at boot time. If the boot loader provides a
1676 command line at boot time, it is appended to this string to
1677 form the full kernel command line, when the system boots.
1678
1679 However, you can use the CONFIG_CMDLINE_OVERRIDE option to
1680 change this behavior.
1681
1682 In most cases, the command line (whether built-in or provided
1683 by the boot loader) should specify the device for the root
1684 file system.
1685
1686config CMDLINE_OVERRIDE
1687 bool "Built-in command line overrides boot loader arguments"
Tim Bird516cbf32008-08-12 12:52:36 -07001688 depends on CMDLINE_BOOL
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001689 ---help---
Tim Bird516cbf32008-08-12 12:52:36 -07001690 Set this option to 'Y' to have the kernel ignore the boot loader
1691 command line, and use ONLY the built-in command line.
1692
1693 This is used to work around broken boot loaders. This should
1694 be set to 'N' under normal conditions.
1695
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001696endmenu
1697
1698config ARCH_ENABLE_MEMORY_HOTPLUG
1699 def_bool y
1700 depends on X86_64 || (X86_32 && HIGHMEM)
1701
Gary Hade35551052008-10-31 10:52:03 -07001702config ARCH_ENABLE_MEMORY_HOTREMOVE
1703 def_bool y
1704 depends on MEMORY_HOTPLUG
1705
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001706config HAVE_ARCH_EARLY_PFN_TO_NID
1707 def_bool X86_64
1708 depends on NUMA
1709
Lee Schermerhorne534c7c2010-05-26 14:44:58 -07001710config USE_PERCPU_NUMA_NODE_ID
Tejun Heo645a7912011-01-23 14:37:40 +01001711 def_bool y
Lee Schermerhorne534c7c2010-05-26 14:44:58 -07001712 depends on NUMA
1713
Bjorn Helgaasda85f862008-11-05 13:37:27 -06001714menu "Power management and ACPI options"
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001715
1716config ARCH_HIBERNATION_HEADER
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001717 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001718 depends on X86_64 && HIBERNATION
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001719
1720source "kernel/power/Kconfig"
1721
1722source "drivers/acpi/Kconfig"
1723
Feng Tangefafc8b2009-08-14 15:23:29 -04001724source "drivers/sfi/Kconfig"
1725
Andi Kleena6b68072008-01-30 13:32:49 +01001726config X86_APM_BOOT
Jan Beulich6fc108a2010-04-21 15:23:44 +01001727 def_bool y
Andi Kleena6b68072008-01-30 13:32:49 +01001728 depends on APM || APM_MODULE
1729
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001730menuconfig APM
1731 tristate "APM (Advanced Power Management) BIOS support"
Ingo Molnarefefa6f2008-07-10 16:09:50 +02001732 depends on X86_32 && PM_SLEEP
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001733 ---help---
1734 APM is a BIOS specification for saving power using several different
1735 techniques. This is mostly useful for battery powered laptops with
1736 APM compliant BIOSes. If you say Y here, the system time will be
1737 reset after a RESUME operation, the /proc/apm device will provide
1738 battery status information, and user-space programs will receive
1739 notification of APM "events" (e.g. battery status change).
1740
1741 If you select "Y" here, you can disable actual use of the APM
1742 BIOS by passing the "apm=off" option to the kernel at boot time.
1743
1744 Note that the APM support is almost completely disabled for
1745 machines with more than one CPU.
1746
1747 In order to use APM, you will need supporting software. For location
Randy Dunlap53471122008-03-12 18:10:51 -04001748 and more information, read <file:Documentation/power/pm.txt> and the
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001749 Battery Powered Linux mini-HOWTO, available from
1750 <http://www.tldp.org/docs.html#howto>.
1751
1752 This driver does not spin down disk drives (see the hdparm(8)
1753 manpage ("man 8 hdparm") for that), and it doesn't turn off
1754 VESA-compliant "green" monitors.
1755
1756 This driver does not support the TI 4000M TravelMate and the ACER
1757 486/DX4/75 because they don't have compliant BIOSes. Many "green"
1758 desktop machines also don't have compliant BIOSes, and this driver
1759 may cause those machines to panic during the boot phase.
1760
1761 Generally, if you don't have a battery in your machine, there isn't
1762 much point in using this driver and you should say N. If you get
1763 random kernel OOPSes or reboots that don't seem to be related to
1764 anything, try disabling/enabling this option (or disabling/enabling
1765 APM in your BIOS).
1766
1767 Some other things you should try when experiencing seemingly random,
1768 "weird" problems:
1769
1770 1) make sure that you have enough swap space and that it is
1771 enabled.
1772 2) pass the "no-hlt" option to the kernel
1773 3) switch on floating point emulation in the kernel and pass
1774 the "no387" option to the kernel
1775 4) pass the "floppy=nodma" option to the kernel
1776 5) pass the "mem=4M" option to the kernel (thereby disabling
1777 all but the first 4 MB of RAM)
1778 6) make sure that the CPU is not over clocked.
1779 7) read the sig11 FAQ at <http://www.bitwizard.nl/sig11/>
1780 8) disable the cache from your BIOS settings
1781 9) install a fan for the video card or exchange video RAM
1782 10) install a better fan for the CPU
1783 11) exchange RAM chips
1784 12) exchange the motherboard.
1785
1786 To compile this driver as a module, choose M here: the
1787 module will be called apm.
1788
1789if APM
1790
1791config APM_IGNORE_USER_SUSPEND
1792 bool "Ignore USER SUSPEND"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001793 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001794 This option will ignore USER SUSPEND requests. On machines with a
1795 compliant APM BIOS, you want to say N. However, on the NEC Versa M
1796 series notebooks, it is necessary to say Y because of a BIOS bug.
1797
1798config APM_DO_ENABLE
1799 bool "Enable PM at boot time"
1800 ---help---
1801 Enable APM features at boot time. From page 36 of the APM BIOS
1802 specification: "When disabled, the APM BIOS does not automatically
1803 power manage devices, enter the Standby State, enter the Suspend
1804 State, or take power saving steps in response to CPU Idle calls."
1805 This driver will make CPU Idle calls when Linux is idle (unless this
1806 feature is turned off -- see "Do CPU IDLE calls", below). This
1807 should always save battery power, but more complicated APM features
1808 will be dependent on your BIOS implementation. You may need to turn
1809 this option off if your computer hangs at boot time when using APM
1810 support, or if it beeps continuously instead of suspending. Turn
1811 this off if you have a NEC UltraLite Versa 33/C or a Toshiba
1812 T400CDT. This is off by default since most machines do fine without
1813 this feature.
1814
1815config APM_CPU_IDLE
1816 bool "Make CPU Idle calls when idle"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001817 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001818 Enable calls to APM CPU Idle/CPU Busy inside the kernel's idle loop.
1819 On some machines, this can activate improved power savings, such as
1820 a slowed CPU clock rate, when the machine is idle. These idle calls
1821 are made after the idle loop has run for some length of time (e.g.,
1822 333 mS). On some machines, this will cause a hang at boot time or
1823 whenever the CPU becomes idle. (On machines with more than one CPU,
1824 this option does nothing.)
1825
1826config APM_DISPLAY_BLANK
1827 bool "Enable console blanking using APM"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001828 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001829 Enable console blanking using the APM. Some laptops can use this to
1830 turn off the LCD backlight when the screen blanker of the Linux
1831 virtual console blanks the screen. Note that this is only used by
1832 the virtual console screen blanker, and won't turn off the backlight
1833 when using the X Window system. This also doesn't have anything to
1834 do with your VESA-compliant power-saving monitor. Further, this
1835 option doesn't work for all laptops -- it might not turn off your
1836 backlight at all, or it might print a lot of errors to the console,
1837 especially if you are using gpm.
1838
1839config APM_ALLOW_INTS
1840 bool "Allow interrupts during APM BIOS calls"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001841 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001842 Normally we disable external interrupts while we are making calls to
1843 the APM BIOS as a measure to lessen the effects of a badly behaving
1844 BIOS implementation. The BIOS should reenable interrupts if it
1845 needs to. Unfortunately, some BIOSes do not -- especially those in
1846 many of the newer IBM Thinkpads. If you experience hangs when you
1847 suspend, try setting this to Y. Otherwise, say N.
1848
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001849endif # APM
1850
1851source "arch/x86/kernel/cpu/cpufreq/Kconfig"
1852
1853source "drivers/cpuidle/Kconfig"
1854
Andy Henroid27471fd2008-10-09 11:45:22 -07001855source "drivers/idle/Kconfig"
1856
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001857endmenu
1858
1859
1860menu "Bus options (PCI etc.)"
1861
1862config PCI
Ingo Molnar1ac97012008-05-19 14:10:14 +02001863 bool "PCI support"
Adrian Bunk1c858082008-01-30 13:32:32 +01001864 default y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001865 select ARCH_SUPPORTS_MSI if (X86_LOCAL_APIC && X86_IO_APIC)
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001866 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001867 Find out whether you have a PCI motherboard. PCI is the name of a
1868 bus system, i.e. the way the CPU talks to the other stuff inside
1869 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
1870 VESA. If you have PCI, say Y, otherwise N.
1871
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001872choice
1873 prompt "PCI access mode"
Ingo Molnarefefa6f2008-07-10 16:09:50 +02001874 depends on X86_32 && PCI
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001875 default PCI_GOANY
1876 ---help---
1877 On PCI systems, the BIOS can be used to detect the PCI devices and
1878 determine their configuration. However, some old PCI motherboards
1879 have BIOS bugs and may crash if this is done. Also, some embedded
1880 PCI-based systems don't have any BIOS at all. Linux can also try to
1881 detect the PCI hardware directly without using the BIOS.
1882
1883 With this option, you can specify how Linux should detect the
1884 PCI devices. If you choose "BIOS", the BIOS will be used,
1885 if you choose "Direct", the BIOS won't be used, and if you
1886 choose "MMConfig", then PCI Express MMCONFIG will be used.
1887 If you choose "Any", the kernel will try MMCONFIG, then the
1888 direct access method and falls back to the BIOS if that doesn't
1889 work. If unsure, go with the default, which is "Any".
1890
1891config PCI_GOBIOS
1892 bool "BIOS"
1893
1894config PCI_GOMMCONFIG
1895 bool "MMConfig"
1896
1897config PCI_GODIRECT
1898 bool "Direct"
1899
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07001900config PCI_GOOLPC
Daniel Drake76fb6572010-09-23 17:28:04 +01001901 bool "OLPC XO-1"
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07001902 depends on OLPC
1903
Andres Salomon2bdd1b02008-06-05 14:14:41 -07001904config PCI_GOANY
1905 bool "Any"
1906
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001907endchoice
1908
1909config PCI_BIOS
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001910 def_bool y
Ingo Molnarefefa6f2008-07-10 16:09:50 +02001911 depends on X86_32 && PCI && (PCI_GOBIOS || PCI_GOANY)
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001912
1913# x86-64 doesn't support PCI BIOS access from long mode so always go direct.
1914config PCI_DIRECT
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001915 def_bool y
Ingo Molnarefefa6f2008-07-10 16:09:50 +02001916 depends on PCI && (X86_64 || (PCI_GODIRECT || PCI_GOANY || PCI_GOOLPC))
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001917
1918config PCI_MMCONFIG
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001919 def_bool y
Feng Tang5f0db7a2009-08-14 15:37:50 -04001920 depends on X86_32 && PCI && (ACPI || SFI) && (PCI_GOMMCONFIG || PCI_GOANY)
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001921
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07001922config PCI_OLPC
Andres Salomon2bdd1b02008-06-05 14:14:41 -07001923 def_bool y
1924 depends on PCI && OLPC && (PCI_GOOLPC || PCI_GOANY)
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07001925
Alex Nixonb5401a92010-03-18 16:31:34 -04001926config PCI_XEN
1927 def_bool y
1928 depends on PCI && XEN
1929 select SWIOTLB_XEN
1930
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001931config PCI_DOMAINS
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001932 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001933 depends on PCI
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001934
1935config PCI_MMCONFIG
1936 bool "Support mmconfig PCI config space access"
1937 depends on X86_64 && PCI && ACPI
1938
Ira W. Snyder3f6ea842010-04-01 11:43:30 -07001939config PCI_CNB20LE_QUIRK
David Rientjes6a108a12011-01-20 14:44:16 -08001940 bool "Read CNB20LE Host Bridge Windows" if EXPERT
Bjorn Helgaas64a5fed2011-01-06 10:12:30 -07001941 default n
1942 depends on PCI && EXPERIMENTAL
Ira W. Snyder3f6ea842010-04-01 11:43:30 -07001943 help
1944 Read the PCI windows out of the CNB20LE host bridge. This allows
1945 PCI hotplug to work on systems with the CNB20LE chipset which do
1946 not have ACPI.
1947
Bjorn Helgaas64a5fed2011-01-06 10:12:30 -07001948 There's no public spec for this chipset, and this functionality
1949 is known to be incomplete.
1950
1951 You should say N unless you know you need this.
1952
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001953config DMAR
1954 bool "Support for DMA Remapping Devices (EXPERIMENTAL)"
David Woodhouse4cf2e752009-02-11 17:23:43 +00001955 depends on PCI_MSI && ACPI && EXPERIMENTAL
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001956 help
1957 DMA remapping (DMAR) devices support enables independent address
1958 translations for Direct Memory Access (DMA) from devices.
1959 These DMA remapping devices are reported via ACPI tables
1960 and include PCI device scope covered by these DMA
1961 remapping devices.
1962
Kyle McMartin0cd5c3c2009-02-04 14:29:19 -08001963config DMAR_DEFAULT_ON
Kyle McMartinf6be37f2009-02-26 12:57:56 -05001964 def_bool y
Kyle McMartin0cd5c3c2009-02-04 14:29:19 -08001965 prompt "Enable DMA Remapping Devices by default"
1966 depends on DMAR
1967 help
1968 Selecting this option will enable a DMAR device at boot time if
1969 one is found. If this option is not selected, DMAR support can
1970 be enabled by passing intel_iommu=on to the kernel. It is
1971 recommended you say N here while the DMAR code remains
1972 experimental.
1973
David Woodhouse62edf5d2009-07-04 10:59:46 +01001974config DMAR_BROKEN_GFX_WA
Jan Beulich6fc108a2010-04-21 15:23:44 +01001975 bool "Workaround broken graphics drivers (going away soon)"
David Woodhouse0c02a202009-09-19 09:37:23 -07001976 depends on DMAR && BROKEN
David Woodhouse62edf5d2009-07-04 10:59:46 +01001977 ---help---
1978 Current Graphics drivers tend to use physical address
1979 for DMA and avoid using DMA APIs. Setting this config
1980 option permits the IOMMU driver to set a unity map for
1981 all the OS-visible memory. Hence the driver can continue
1982 to use physical addresses for DMA, at least until this
1983 option is removed in the 2.6.32 kernel.
1984
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001985config DMAR_FLOPPY_WA
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001986 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001987 depends on DMAR
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001988 ---help---
David Woodhousec7ab48d2009-06-26 19:10:36 +01001989 Floppy disk drivers are known to bypass DMA API calls
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001990 thereby failing to work when IOMMU is enabled. This
1991 workaround will setup a 1:1 mapping for the first
David Woodhousec7ab48d2009-06-26 19:10:36 +01001992 16MiB to make floppy (an ISA device) work.
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001993
Suresh Siddha9fa8c482008-07-10 11:17:00 -07001994config INTR_REMAP
1995 bool "Support for Interrupt Remapping (EXPERIMENTAL)"
1996 depends on X86_64 && X86_IO_APIC && PCI_MSI && ACPI && EXPERIMENTAL
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001997 ---help---
1998 Supports Interrupt remapping for IO-APIC and MSI devices.
1999 To use x2apic mode in the CPU's which support x2APIC enhancements or
2000 to support platforms with CPU's having > 8 bit APIC ID, say Y.
Suresh Siddha9fa8c482008-07-10 11:17:00 -07002001
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002002source "drivers/pci/pcie/Kconfig"
2003
2004source "drivers/pci/Kconfig"
2005
David Rientjes1c00f012011-03-22 16:34:59 -07002006# x86_64 have no ISA slots, but can have ISA-style DMA.
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002007config ISA_DMA_API
David Rientjes1c00f012011-03-22 16:34:59 -07002008 bool "ISA-style DMA support" if (X86_64 && EXPERT)
2009 default y
2010 help
2011 Enables ISA-style DMA support for devices requiring such controllers.
2012 If unsure, say Y.
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002013
2014if X86_32
2015
2016config ISA
2017 bool "ISA support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002018 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002019 Find out whether you have ISA slots on your motherboard. ISA is the
2020 name of a bus system, i.e. the way the CPU talks to the other stuff
2021 inside your box. Other bus systems are PCI, EISA, MicroChannel
2022 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
2023 newer boards don't support it. If you have ISA, say Y, otherwise N.
2024
2025config EISA
2026 bool "EISA support"
2027 depends on ISA
2028 ---help---
2029 The Extended Industry Standard Architecture (EISA) bus was
2030 developed as an open alternative to the IBM MicroChannel bus.
2031
2032 The EISA bus provided some of the features of the IBM MicroChannel
2033 bus while maintaining backward compatibility with cards made for
2034 the older ISA bus. The EISA bus saw limited use between 1988 and
2035 1995 when it was made obsolete by the PCI bus.
2036
2037 Say Y here if you are building a kernel for an EISA-based machine.
2038
2039 Otherwise, say N.
2040
2041source "drivers/eisa/Kconfig"
2042
2043config MCA
Ingo Molnar72ee6eb2009-01-27 16:57:49 +01002044 bool "MCA support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002045 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002046 MicroChannel Architecture is found in some IBM PS/2 machines and
2047 laptops. It is a bus system similar to PCI or ISA. See
2048 <file:Documentation/mca.txt> (and especially the web page given
2049 there) before attempting to build an MCA bus kernel.
2050
2051source "drivers/mca/Kconfig"
2052
2053config SCx200
2054 tristate "NatSemi SCx200 support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002055 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002056 This provides basic support for National Semiconductor's
2057 (now AMD's) Geode processors. The driver probes for the
2058 PCI-IDs of several on-chip devices, so its a good dependency
2059 for other scx200_* drivers.
2060
2061 If compiled as a module, the driver is named scx200.
2062
2063config SCx200HR_TIMER
2064 tristate "NatSemi SCx200 27MHz High-Resolution Timer Support"
John Stultz592913e2010-07-13 17:56:20 -07002065 depends on SCx200
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002066 default y
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002067 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002068 This driver provides a clocksource built upon the on-chip
2069 27MHz high-resolution timer. Its also a workaround for
2070 NSC Geode SC-1100's buggy TSC, which loses time when the
2071 processor goes idle (as is done by the scheduler). The
2072 other workaround is idle=poll boot option.
2073
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07002074config OLPC
2075 bool "One Laptop Per Child support"
Thomas Gleixner54008972011-02-23 09:50:15 +01002076 depends on !X86_PAE
Andres Salomon3c554942009-12-14 18:00:36 -08002077 select GPIOLIB
Thomas Gleixnerdc3119e72011-02-23 10:08:31 +01002078 select OF
Thomas Gleixnerc2a941f2011-02-23 10:32:42 +01002079 select OF_PROMTREE if PROC_DEVICETREE
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002080 ---help---
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07002081 Add support for detecting the unique features of the OLPC
2082 XO hardware.
2083
Daniel Drakebf1ebf02010-10-10 10:40:32 +01002084config OLPC_XO1
2085 tristate "OLPC XO-1 support"
Andres Salomon419cdc52010-11-29 15:45:06 -08002086 depends on OLPC && MFD_CS5535
Daniel Drakebf1ebf02010-10-10 10:40:32 +01002087 ---help---
2088 Add support for non-essential features of the OLPC XO-1 laptop.
2089
Sam Ravnborgbc0120f2007-11-06 23:10:39 +01002090endif # X86_32
2091
Andreas Herrmann23ac4ae2010-09-17 18:03:43 +02002092config AMD_NB
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002093 def_bool y
Borislav Petkov0e152cd2010-03-12 15:43:03 +01002094 depends on CPU_SUP_AMD && PCI
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002095
2096source "drivers/pcmcia/Kconfig"
2097
2098source "drivers/pci/hotplug/Kconfig"
2099
Alexandre Bounine388b78a2011-03-23 16:43:03 -07002100config RAPIDIO
2101 bool "RapidIO support"
2102 depends on PCI
2103 default n
2104 help
2105 If you say Y here, the kernel will include drivers and
2106 infrastructure code to support RapidIO interconnect devices.
2107
2108source "drivers/rapidio/Kconfig"
2109
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002110endmenu
2111
2112
2113menu "Executable file formats / Emulations"
2114
2115source "fs/Kconfig.binfmt"
2116
2117config IA32_EMULATION
2118 bool "IA32 Emulation"
2119 depends on X86_64
Roland McGratha97f52e2008-01-30 13:31:55 +01002120 select COMPAT_BINFMT_ELF
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002121 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002122 Include code to run 32-bit programs under a 64-bit kernel. You should
2123 likely turn this on, unless you're 100% sure that you don't have any
2124 32-bit programs left.
2125
2126config IA32_AOUT
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002127 tristate "IA32 a.out support"
2128 depends on IA32_EMULATION
2129 ---help---
2130 Support old a.out binaries in the 32bit emulation.
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002131
2132config COMPAT
Harvey Harrison3c2362e2008-01-30 13:31:03 +01002133 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002134 depends on IA32_EMULATION
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002135
2136config COMPAT_FOR_U64_ALIGNMENT
2137 def_bool COMPAT
2138 depends on X86_64
2139
2140config SYSVIPC_COMPAT
Harvey Harrison3c2362e2008-01-30 13:31:03 +01002141 def_bool y
Alexey Dobriyanb8992192008-09-14 13:44:41 +04002142 depends on COMPAT && SYSVIPC
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002143
David Howellsee009e4a02011-03-07 15:06:20 +00002144config KEYS_COMPAT
2145 bool
2146 depends on COMPAT && KEYS
2147 default y
2148
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002149endmenu
2150
2151
Keith Packarde5beae12008-11-03 18:21:45 +01002152config HAVE_ATOMIC_IOMAP
2153 def_bool y
2154 depends on X86_32
2155
Masami Hiramatsu3cba11d2010-10-14 12:10:42 +09002156config HAVE_TEXT_POKE_SMP
2157 bool
2158 select STOP_MACHINE if SMP
2159
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002160source "net/Kconfig"
2161
2162source "drivers/Kconfig"
2163
2164source "drivers/firmware/Kconfig"
2165
2166source "fs/Kconfig"
2167
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002168source "arch/x86/Kconfig.debug"
2169
2170source "security/Kconfig"
2171
2172source "crypto/Kconfig"
2173
Avi Kivityedf88412007-12-16 11:02:48 +02002174source "arch/x86/kvm/Kconfig"
2175
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002176source "lib/Kconfig"