blob: 1f03e221a01ec4ec8d8fd0fad24ca5b438d630f5 [file] [log] [blame]
Sam Ravnborgdaa93fa2007-11-12 20:54:30 +01001# Select 32 or 64 bit
2config 64BIT
Sam Ravnborg68409992007-11-17 15:37:31 +01003 bool "64-bit kernel" if ARCH = "x86"
4 default ARCH = "x86_64"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01005 ---help---
Sam Ravnborgdaa93fa2007-11-12 20:54:30 +01006 Say yes to build a 64-bit kernel - formerly known as x86_64
7 Say no to build a 32-bit kernel - formerly known as i386
8
9config X86_32
10 def_bool !64BIT
Russell King82491452011-05-08 18:55:19 +010011 select CLKSRC_I8253
Sam Ravnborgdaa93fa2007-11-12 20:54:30 +010012
13config X86_64
14 def_bool 64BIT
Sam Ravnborg1032c0b2007-11-06 21:35:08 +010015
16### Arch settings
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010017config X86
Harvey Harrison3c2362e2008-01-30 13:31:03 +010018 def_bool y
David Woodhousee17c6d52008-06-17 12:19:34 +010019 select HAVE_AOUT if X86_32
Ingo Molnara5574cf2008-05-05 23:19:50 +020020 select HAVE_UNSTABLE_SCHED_CLOCK
Sam Ravnborgec7748b2008-02-09 10:46:40 +010021 select HAVE_IDE
Mathieu Desnoyers42d4b832008-02-02 15:10:34 -050022 select HAVE_OPROFILE
Peter Zijlstracc2067a2010-11-16 21:49:01 +010023 select HAVE_PERF_EVENTS
Peter Zijlstrae360adb2010-10-14 14:01:34 +080024 select HAVE_IRQ_WORK
Rik van Riel28b2ee22008-07-23 21:27:05 -070025 select HAVE_IOREMAP_PROT
Mathieu Desnoyers3f550092008-02-02 15:10:35 -050026 select HAVE_KPROBES
Yinghai Lu72d7c3b2010-08-25 13:39:17 -070027 select HAVE_MEMBLOCK
Ingo Molnar1f972762008-07-26 13:52:50 +020028 select ARCH_WANT_OPTIONAL_GPIOLIB
Ingo Molnarda4276b2009-01-07 11:05:10 +010029 select ARCH_WANT_FRAME_POINTERS
FUJITA Tomonori7c095e42009-06-17 16:28:12 -070030 select HAVE_DMA_ATTRS
Ananth N Mavinakayanahalli9edddaa2008-03-04 14:28:37 -080031 select HAVE_KRETPROBES
Masami Hiramatsuc0f7ac32010-02-25 08:34:46 -050032 select HAVE_OPTPROBES
Steven Rostedte4b2b882008-08-14 15:45:11 -040033 select HAVE_FTRACE_MCOUNT_RECORD
Steven Rostedtcf4db252010-10-14 23:32:44 -040034 select HAVE_C_RECORDMCOUNT
Steven Rostedt677aa9f2008-05-17 00:01:36 -040035 select HAVE_DYNAMIC_FTRACE
Steven Rostedt606576c2008-10-06 19:06:12 -040036 select HAVE_FUNCTION_TRACER
Frederic Weisbecker48d68b22008-12-02 00:20:39 +010037 select HAVE_FUNCTION_GRAPH_TRACER
Steven Rostedt71e308a2009-06-18 12:45:08 -040038 select HAVE_FUNCTION_GRAPH_FP_TEST
Steven Rostedt60a7ecf2008-11-05 16:05:44 -050039 select HAVE_FUNCTION_TRACE_MCOUNT_TEST
Steven Rostedt9a5fd902009-02-06 01:14:26 -050040 select HAVE_FTRACE_NMI_ENTER if DYNAMIC_FTRACE
Josh Stone66700002009-08-24 14:43:11 -070041 select HAVE_SYSCALL_TRACEPOINTS
Ingo Molnare0ec9482009-01-27 17:01:14 +010042 select HAVE_KVM
Ingo Molnar49793b02009-01-27 17:02:29 +010043 select HAVE_ARCH_KGDB
Roland McGrath99bbc4b2008-04-20 14:35:12 -070044 select HAVE_ARCH_TRACEHOOK
Dmitry Baryshkov323ec002008-06-29 14:19:31 +040045 select HAVE_GENERIC_DMA_COHERENT if X86_32
Johannes Berg58340a02008-07-25 01:45:33 -070046 select HAVE_EFFICIENT_UNALIGNED_ACCESS
Török Edwin8d264872008-11-23 12:39:08 +020047 select USER_STACKTRACE_SUPPORT
Heiko Carstensf850c30c2010-02-10 17:25:17 +010048 select HAVE_REGS_AND_STACK_ACCESS_API
Joerg Roedel2118d0c2009-01-09 15:13:15 +010049 select HAVE_DMA_API_DEBUG
H. Peter Anvin2e9f3bd2009-01-04 15:41:25 -080050 select HAVE_KERNEL_GZIP
51 select HAVE_KERNEL_BZIP2
52 select HAVE_KERNEL_LZMA
Lasse Collin30314802011-01-12 17:01:24 -080053 select HAVE_KERNEL_XZ
Albin Tonnerre13510992010-01-08 14:42:45 -080054 select HAVE_KERNEL_LZO
K.Prasad0067f122009-06-01 23:43:57 +053055 select HAVE_HW_BREAKPOINT
Frederic Weisbecker01027522010-04-11 18:55:56 +020056 select HAVE_MIXED_BREAKPOINTS_REGS
Frederic Weisbecker99e8c5a2009-12-17 01:33:54 +010057 select PERF_EVENTS
Frederic Weisbeckerc01d4322010-05-15 22:57:48 +020058 select HAVE_PERF_EVENTS_NMI
Frederic Weisbecker99e8c5a2009-12-17 01:33:54 +010059 select ANON_INODES
Pekka Enberg0a4af3b2009-02-26 21:38:56 +020060 select HAVE_ARCH_KMEMCHECK
Avi Kivity7c68af62009-09-19 09:40:22 +030061 select HAVE_USER_RETURN_NOTIFIER
Steven Rostedt46eb3b62010-09-22 23:10:23 -040062 select HAVE_ARCH_JUMP_LABEL
Masami Hiramatsu3cba11d2010-10-14 12:10:42 +090063 select HAVE_TEXT_POKE_SMP
Thomas Gleixner3bb98082010-09-27 12:46:02 +000064 select HAVE_GENERIC_HARDIRQS
65 select HAVE_SPARSE_IRQ
Jan Beulichc49aa5b2011-03-08 09:24:26 +000066 select GENERIC_FIND_FIRST_BIT
Thomas Gleixner3bb98082010-09-27 12:46:02 +000067 select GENERIC_IRQ_PROBE
68 select GENERIC_PENDING_IRQ if SMP
Thomas Gleixner517e4982010-12-16 17:59:57 +010069 select GENERIC_IRQ_SHOW
Thomas Gleixnerc01858082011-02-07 02:24:08 +010070 select IRQ_FORCED_THREADING
Amerigo Wang351f8f82011-01-12 16:59:39 -080071 select USE_GENERIC_SMP_HELPERS if SMP
Randy Dunlap9cddf152011-05-04 11:06:05 -070072 select HAVE_BPF_JIT if (X86_64 && NET)
Balbir Singh7d8330a2008-02-10 12:46:28 +053073
Ingo Molnarba7e4d12009-06-06 13:58:12 +020074config INSTRUCTION_DECODER
75 def_bool (KPROBES || PERF_EVENTS)
76
Linus Torvalds51b26ad2009-04-26 10:12:47 -070077config OUTPUT_FORMAT
78 string
79 default "elf32-i386" if X86_32
80 default "elf64-x86-64" if X86_64
81
Sam Ravnborg73531902008-05-25 23:03:18 +020082config ARCH_DEFCONFIG
Sam Ravnborgb9b39bf2008-04-29 12:48:15 +020083 string
Sam Ravnborg73531902008-05-25 23:03:18 +020084 default "arch/x86/configs/i386_defconfig" if X86_32
85 default "arch/x86/configs/x86_64_defconfig" if X86_64
Sam Ravnborgb9b39bf2008-04-29 12:48:15 +020086
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010087config GENERIC_CMOS_UPDATE
Harvey Harrison3c2362e2008-01-30 13:31:03 +010088 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010089
90config CLOCKSOURCE_WATCHDOG
Harvey Harrison3c2362e2008-01-30 13:31:03 +010091 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010092
93config GENERIC_CLOCKEVENTS
Harvey Harrison3c2362e2008-01-30 13:31:03 +010094 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010095
96config GENERIC_CLOCKEVENTS_BROADCAST
Harvey Harrison3c2362e2008-01-30 13:31:03 +010097 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010098 depends on X86_64 || (X86_32 && X86_LOCAL_APIC)
99
100config LOCKDEP_SUPPORT
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100101 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100102
103config STACKTRACE_SUPPORT
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100104 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100105
Heiko Carstensaa7d9352008-02-01 17:45:14 +0100106config HAVE_LATENCYTOP_SUPPORT
107 def_bool y
108
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100109config MMU
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100110 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100111
112config ZONE_DMA
David Rientjesdc382fd2011-05-16 13:54:10 -0700113 bool "DMA memory allocation support" if EXPERT
114 default y
115 help
116 DMA memory allocation support allows devices with less than 32-bit
117 addressing to allocate within the first 16MB of address space.
118 Disable if no such devices will be used.
119
120 If unsure, say Y.
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100121
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100122config SBUS
123 bool
124
FUJITA Tomonori3bc4e452010-03-10 15:23:22 -0800125config NEED_DMA_MAP_STATE
126 def_bool (X86_64 || DMAR || DMA_API_DEBUG)
127
FUJITA Tomonori18e98302010-05-26 14:44:32 -0700128config NEED_SG_DMA_LENGTH
Andrew Morton4a14d842010-05-26 14:44:33 -0700129 def_bool y
FUJITA Tomonori18e98302010-05-26 14:44:32 -0700130
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100131config GENERIC_ISA_DMA
David Rientjes1c00f012011-03-22 16:34:59 -0700132 def_bool ISA_DMA_API
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100133
134config GENERIC_IOMAP
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100135 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100136
137config GENERIC_BUG
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100138 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100139 depends on BUG
Jan Beulichb93a5312008-12-16 11:40:27 +0000140 select GENERIC_BUG_RELATIVE_POINTERS if X86_64
141
142config GENERIC_BUG_RELATIVE_POINTERS
143 bool
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100144
145config GENERIC_HWEIGHT
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100146 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100147
Florian Fainellia6082952008-01-30 13:33:35 +0100148config GENERIC_GPIO
Jan Beulich9ba16082008-10-15 22:01:38 -0700149 bool
Florian Fainellia6082952008-01-30 13:33:35 +0100150
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100151config ARCH_MAY_HAVE_PC_FDC
David Rientjes8df3bd92011-03-22 16:34:58 -0700152 def_bool ISA_DMA_API
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100153
Sam Ravnborg1032c0b2007-11-06 21:35:08 +0100154config RWSEM_GENERIC_SPINLOCK
155 def_bool !X86_XADD
156
157config RWSEM_XCHGADD_ALGORITHM
158 def_bool X86_XADD
159
Venki Pallipadia6869cc2008-02-08 17:05:44 -0800160config ARCH_HAS_CPU_IDLE_WAIT
161 def_bool y
162
Sam Ravnborg1032c0b2007-11-06 21:35:08 +0100163config GENERIC_CALIBRATE_DELAY
164 def_bool y
165
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100166config GENERIC_TIME_VSYSCALL
167 bool
168 default X86_64
169
venkatesh.pallipadi@intel.com9a0b8412008-01-31 17:35:06 -0800170config ARCH_HAS_CPU_RELAX
171 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100172
Venkatesh Pallipadi89cedfe2008-10-16 19:00:08 -0400173config ARCH_HAS_DEFAULT_IDLE
174 def_bool y
175
Pekka Enberg1b27d052008-04-28 02:12:22 -0700176config ARCH_HAS_CACHE_LINE_SIZE
177 def_bool y
178
Mike Travisdd5af902008-01-30 13:33:32 +0100179config HAVE_SETUP_PER_CPU_AREA
Brian Gerst89c9c4c2009-01-27 12:56:48 +0900180 def_bool y
travis@sgi.comb32ef632008-01-30 13:32:51 +0100181
Tejun Heo08fc4582009-08-14 15:00:49 +0900182config NEED_PER_CPU_EMBED_FIRST_CHUNK
183 def_bool y
184
185config NEED_PER_CPU_PAGE_FIRST_CHUNK
Tejun Heo11124412009-02-20 16:29:09 +0900186 def_bool y
187
Mike Travis9f0e8d02008-04-04 18:11:01 -0700188config HAVE_CPUMASK_OF_CPU_MAP
189 def_bool X86_64_SMP
190
Johannes Berg801e4062007-12-08 02:12:39 +0100191config ARCH_HIBERNATION_POSSIBLE
192 def_bool y
Johannes Berg801e4062007-12-08 02:12:39 +0100193
Johannes Bergf4cb5702007-12-08 02:14:00 +0100194config ARCH_SUSPEND_POSSIBLE
195 def_bool y
Johannes Bergf4cb5702007-12-08 02:14:00 +0100196
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100197config ZONE_DMA32
198 bool
199 default X86_64
200
201config ARCH_POPULATES_NODE_MAP
202 def_bool y
203
204config AUDIT_ARCH
205 bool
206 default X86_64
207
Ingo Molnar765c68b2008-04-09 11:03:37 +0200208config ARCH_SUPPORTS_OPTIMIZED_INLINING
209 def_bool y
210
Akinobu Mita6a11f752009-03-31 15:23:17 -0700211config ARCH_SUPPORTS_DEBUG_PAGEALLOC
212 def_bool y
213
Shane Wang69575d32009-09-01 18:25:07 -0700214config HAVE_INTEL_TXT
215 def_bool y
216 depends on EXPERIMENTAL && DMAR && ACPI
217
Sam Ravnborg6b0c3d42008-01-30 13:32:27 +0100218config X86_32_SMP
219 def_bool y
220 depends on X86_32 && SMP
221
222config X86_64_SMP
223 def_bool y
224 depends on X86_64 && SMP
225
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100226config X86_HT
Jan Beulich6fc108a2010-04-21 15:23:44 +0100227 def_bool y
Adrian Bunkee0011a2007-12-04 17:19:07 +0100228 depends on SMP
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100229
Tejun Heoccbeed32009-02-09 22:17:40 +0900230config X86_32_LAZY_GS
231 def_bool y
Tejun Heo60a53172009-02-09 22:17:40 +0900232 depends on X86_32 && !CC_STACKPROTECTOR
Tejun Heoccbeed32009-02-09 22:17:40 +0900233
Borislav Petkovd61931d2010-03-05 17:34:46 +0100234config ARCH_HWEIGHT_CFLAGS
235 string
236 default "-fcall-saved-ecx -fcall-saved-edx" if X86_32
237 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
238
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100239config KTIME_SCALAR
240 def_bool X86_32
Borislav Petkovd7c53c92010-08-19 20:10:29 +0200241
242config ARCH_CPU_PROBE_RELEASE
243 def_bool y
244 depends on HOTPLUG_CPU
245
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100246source "init/Kconfig"
Matt Helsleydc52ddc2008-10-18 20:27:21 -0700247source "kernel/Kconfig.freezer"
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100248
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100249menu "Processor type and features"
250
251source "kernel/time/Kconfig"
252
253config SMP
254 bool "Symmetric multi-processing support"
255 ---help---
256 This enables support for systems with more than one CPU. If you have
257 a system with only one CPU, like most personal computers, say N. If
258 you have a system with more than one CPU, say Y.
259
260 If you say N here, the kernel will run on single and multiprocessor
261 machines, but will use only one CPU of a multiprocessor machine. If
262 you say Y here, the kernel will run on many, but not all,
263 singleprocessor machines. On a singleprocessor machine, the kernel
264 will run faster if you say N here.
265
266 Note that if you say Y here and choose architecture "586" or
267 "Pentium" under "Processor family", the kernel will not work on 486
268 architectures. Similarly, multiprocessor kernels for the "PPro"
269 architecture may not work on all Pentium based boards.
270
271 People using multiprocessor machines who say Y here should also say
272 Y to "Enhanced Real Time Clock Support", below. The "Advanced Power
273 Management" code will be disabled if you say Y here.
274
Adrian Bunk03502fa2008-02-03 15:50:21 +0200275 See also <file:Documentation/i386/IO-APIC.txt>,
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100276 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
277 <http://www.tldp.org/docs.html#howto>.
278
279 If you don't know what to do here, say N.
280
Yinghai Lu06cd9a72009-02-16 17:29:58 -0800281config X86_X2APIC
282 bool "Support x2apic"
David Woodhousef7d7f862009-04-06 23:04:40 -0700283 depends on X86_LOCAL_APIC && X86_64 && INTR_REMAP
Yinghai Lu06cd9a72009-02-16 17:29:58 -0800284 ---help---
285 This enables x2apic support on CPUs that have this feature.
286
287 This allows 32-bit apic IDs (so it can support very large systems),
288 and accesses the local apic via MSRs not via mmio.
289
Yinghai Lu06cd9a72009-02-16 17:29:58 -0800290 If you don't know what to do here, say N.
291
Yinghai Lu6695c852008-06-19 12:13:09 -0700292config X86_MPPARSE
Jan Beulich7a527682008-10-30 10:38:24 +0000293 bool "Enable MPS table" if ACPI
294 default y
Ingo Molnar5ab74722008-07-10 14:42:03 +0200295 depends on X86_LOCAL_APIC
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100296 ---help---
Yinghai Lu6695c852008-06-19 12:13:09 -0700297 For old smp systems that do not have proper acpi support. Newer systems
298 (esp with 64bit cpus) with acpi support, MADT and DSDT will override it
Yinghai Lu6695c852008-06-19 12:13:09 -0700299
Yinghai Lu26f7ef12009-01-29 14:19:22 -0800300config X86_BIGSMP
301 bool "Support for big SMP systems with more than 8 CPUs"
302 depends on X86_32 && SMP
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100303 ---help---
Yinghai Lu26f7ef12009-01-29 14:19:22 -0800304 This option is needed for the systems that have more than 8 CPUs
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100305
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800306if X86_32
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800307config X86_EXTENDED_PLATFORM
308 bool "Support for extended (non-PC) x86 platforms"
309 default y
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100310 ---help---
Ingo Molnar06ac8342009-01-27 18:11:43 +0100311 If you disable this option then the kernel will only support
312 standard PC platforms. (which covers the vast majority of
313 systems out there.)
314
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800315 If you enable this option then you'll be able to select support
316 for the following (non-PC) 32 bit x86 platforms:
317 AMD Elan
318 NUMAQ (IBM/Sequent)
319 RDC R-321x SoC
320 SGI 320/540 (Visual Workstation)
321 Summit/EXA (IBM x440)
322 Unisys ES7000 IA32 series
Thomas Gleixner3f4110a2009-08-29 14:54:20 +0200323 Moorestown MID devices
Ingo Molnar06ac8342009-01-27 18:11:43 +0100324
325 If you have one of these systems, or if you want to build a
326 generic distribution kernel, say Y here - otherwise say N.
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800327endif
Ingo Molnar06ac8342009-01-27 18:11:43 +0100328
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800329if X86_64
330config X86_EXTENDED_PLATFORM
331 bool "Support for extended (non-PC) x86 platforms"
332 default y
333 ---help---
334 If you disable this option then the kernel will only support
335 standard PC platforms. (which covers the vast majority of
336 systems out there.)
337
338 If you enable this option then you'll be able to select support
339 for the following (non-PC) 64 bit x86 platforms:
340 ScaleMP vSMP
341 SGI Ultraviolet
342
343 If you have one of these systems, or if you want to build a
344 generic distribution kernel, say Y here - otherwise say N.
345endif
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800346# This is an alphabetically sorted list of 64 bit extended platforms
347# Please maintain the alphabetic order if and when there are additions
Nick Piggin03b48632009-01-20 04:36:04 +0100348
Ingo Molnar6a485652009-01-27 18:29:13 +0100349config X86_VSMP
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800350 bool "ScaleMP vSMP"
Randy Dunlap03f1a172010-10-13 21:00:23 -0700351 select PARAVIRT_GUEST
Ingo Molnar6a485652009-01-27 18:29:13 +0100352 select PARAVIRT
353 depends on X86_64 && PCI
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800354 depends on X86_EXTENDED_PLATFORM
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100355 ---help---
Ingo Molnar6a485652009-01-27 18:29:13 +0100356 Support for ScaleMP vSMP systems. Say 'Y' here if this kernel is
357 supposed to run on these EM64T-based machines. Only choose this option
358 if you have one of these machines.
359
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800360config X86_UV
361 bool "SGI Ultraviolet"
362 depends on X86_64
363 depends on X86_EXTENDED_PLATFORM
Jack Steiner54c28d22009-04-03 15:39:42 -0500364 depends on NUMA
Suresh Siddha9d6c26e2009-04-20 13:02:31 -0700365 depends on X86_X2APIC
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800366 ---help---
367 This option is needed in order to support SGI Ultraviolet systems.
368 If you don't have one of these, you should say N here.
369
370# Following is an alphabetically sorted list of 32 bit extended platforms
371# Please maintain the alphabetic order if and when there are additions
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100372
Thomas Gleixnerc751e172010-11-09 12:08:04 -0800373config X86_INTEL_CE
374 bool "CE4100 TV platform"
375 depends on PCI
376 depends on PCI_GODIRECT
377 depends on X86_32
378 depends on X86_EXTENDED_PLATFORM
Dirk Brandewie37bc9f52010-11-09 12:08:08 -0800379 select X86_REBOOTFIXUPS
Sebastian Andrzej Siewiorda6b7372011-02-22 21:07:37 +0100380 select OF
381 select OF_EARLY_FLATTREE
Thomas Gleixnerc751e172010-11-09 12:08:04 -0800382 ---help---
383 Select for the Intel CE media processor (CE4100) SOC.
384 This option compiles in support for the CE4100 SOC for settop
385 boxes and media devices.
386
Thomas Gleixner3f4110a2009-08-29 14:54:20 +0200387config X86_MRST
388 bool "Moorestown MID platform"
Jacob Pan4b2f3f72010-02-25 10:02:14 -0800389 depends on PCI
390 depends on PCI_GOANY
Thomas Gleixner3f4110a2009-08-29 14:54:20 +0200391 depends on X86_32
392 depends on X86_EXTENDED_PLATFORM
Jacob Pan4b2f3f72010-02-25 10:02:14 -0800393 depends on X86_IO_APIC
Jacob Panbb24c472009-09-02 07:37:17 -0700394 select APB_TIMER
Feng Tang1da4b1c2010-11-09 11:22:58 +0000395 select I2C
396 select SPI
Alan Coxb9fc71f2010-11-15 17:31:19 +0000397 select INTEL_SCU_IPC
Randy Dunlapad025192010-11-15 10:14:06 -0800398 select X86_PLATFORM_DEVICES
Thomas Gleixner3f4110a2009-08-29 14:54:20 +0200399 ---help---
400 Moorestown is Intel's Low Power Intel Architecture (LPIA) based Moblin
401 Internet Device(MID) platform. Moorestown consists of two chips:
402 Lincroft (CPU core, graphics, and memory controller) and Langwell IOH.
403 Unlike standard x86 PCs, Moorestown does not have many legacy devices
404 nor standard legacy replacement devices/features. e.g. Moorestown does
405 not contain i8259, i8254, HPET, legacy BIOS, most of the io ports.
406
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800407config X86_RDC321X
408 bool "RDC R-321x SoC"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100409 depends on X86_32
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800410 depends on X86_EXTENDED_PLATFORM
411 select M486
412 select X86_REBOOTFIXUPS
413 ---help---
414 This option is needed for RDC R-321x system-on-chip, also known
415 as R-8610-(G).
416 If you don't have one of these chips, you should say N here.
417
Ingo Molnare0c7ae32009-01-27 18:43:09 +0100418config X86_32_NON_STANDARD
Ingo Molnar9c398012009-01-27 18:24:57 +0100419 bool "Support non-standard 32-bit SMP architectures"
420 depends on X86_32 && SMP
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800421 depends on X86_EXTENDED_PLATFORM
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100422 ---help---
423 This option compiles in the NUMAQ, Summit, bigsmp, ES7000, default
Yinghai Lud49c4282008-06-08 18:31:54 -0700424 subarchitectures. It is intended for a generic binary kernel.
425 if you select them all, kernel will probe it one by one. and will
426 fallback to default.
427
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800428# Alphabetically sorted list of Non standard 32 bit platforms
Yinghai Lud49c4282008-06-08 18:31:54 -0700429
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100430config X86_NUMAQ
431 bool "NUMAQ (IBM/Sequent)"
Ingo Molnare0c7ae32009-01-27 18:43:09 +0100432 depends on X86_32_NON_STANDARD
Pan, Jacob juna92d1522010-02-24 16:59:55 -0800433 depends on PCI
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100434 select NUMA
Ingo Molnar9c398012009-01-27 18:24:57 +0100435 select X86_MPPARSE
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100436 ---help---
Yinghai Lud49c4282008-06-08 18:31:54 -0700437 This option is used for getting Linux to run on a NUMAQ (IBM/Sequent)
438 NUMA multiquad box. This changes the way that processors are
439 bootstrapped, and uses Clustered Logical APIC addressing mode instead
440 of Flat Logical. You will need a new lynxer.elf file to flash your
441 firmware with - send email to <Martin.Bligh@us.ibm.com>.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100442
Linus Torvaldsd949f362009-09-26 09:35:07 -0700443config X86_SUPPORTS_MEMORY_FAILURE
Jan Beulich6fc108a2010-04-21 15:23:44 +0100444 def_bool y
Linus Torvaldsd949f362009-09-26 09:35:07 -0700445 # MCE code calls memory_failure():
446 depends on X86_MCE
447 # On 32-bit this adds too big of NODES_SHIFT and we run out of page flags:
448 depends on !X86_NUMAQ
449 # On 32-bit SPARSEMEM adds too big of SECTIONS_WIDTH:
450 depends on X86_64 || !SPARSEMEM
451 select ARCH_SUPPORTS_MEMORY_FAILURE
Linus Torvaldsd949f362009-09-26 09:35:07 -0700452
Ingo Molnar1b84e1c2008-07-10 15:55:27 +0200453config X86_VISWS
454 bool "SGI 320/540 (Visual Workstation)"
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800455 depends on X86_32 && PCI && X86_MPPARSE && PCI_GODIRECT
456 depends on X86_32_NON_STANDARD
457 ---help---
Ingo Molnar1b84e1c2008-07-10 15:55:27 +0200458 The SGI Visual Workstation series is an IA32-based workstation
459 based on SGI systems chips with some legacy PC hardware attached.
460
461 Say Y here to create a kernel to run on the SGI 320 or 540.
462
463 A kernel compiled for the Visual Workstation will run on general
464 PCs as well. See <file:Documentation/sgi-visws.txt> for details.
465
Ingo Molnar9c398012009-01-27 18:24:57 +0100466config X86_SUMMIT
467 bool "Summit/EXA (IBM x440)"
Ingo Molnare0c7ae32009-01-27 18:43:09 +0100468 depends on X86_32_NON_STANDARD
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100469 ---help---
Ingo Molnar9c398012009-01-27 18:24:57 +0100470 This option is needed for IBM systems that use the Summit/EXA chipset.
471 In particular, it is needed for the x440.
Ingo Molnar1f972762008-07-26 13:52:50 +0200472
Ingo Molnar9c398012009-01-27 18:24:57 +0100473config X86_ES7000
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800474 bool "Unisys ES7000 IA32 series"
Yinghai Lu26f7ef12009-01-29 14:19:22 -0800475 depends on X86_32_NON_STANDARD && X86_BIGSMP
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100476 ---help---
Ingo Molnar9c398012009-01-27 18:24:57 +0100477 Support for Unisys ES7000 systems. Say 'Y' here if this kernel is
478 supposed to run on an IA32-based Unisys ES7000 system.
479
Shérab82148d12010-09-25 06:06:57 +0200480config X86_32_IRIS
481 tristate "Eurobraille/Iris poweroff module"
482 depends on X86_32
483 ---help---
484 The Iris machines from EuroBraille do not have APM or ACPI support
485 to shut themselves down properly. A special I/O sequence is
486 needed to do so, which is what this module does at
487 kernel shutdown.
488
489 This is only for Iris machines from EuroBraille.
490
491 If unused, say N.
492
Ingo Molnarae1e9132008-11-11 09:05:16 +0100493config SCHED_OMIT_FRAME_POINTER
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100494 def_bool y
495 prompt "Single-depth WCHAN output"
Ken Chena87d0912008-11-06 11:10:49 -0800496 depends on X86
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100497 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100498 Calculate simpler /proc/<PID>/wchan values. If this option
499 is disabled then wchan values will recurse back to the
500 caller function. This provides more accurate wchan values,
501 at the expense of slightly more scheduling overhead.
502
503 If in doubt, say "Y".
504
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100505menuconfig PARAVIRT_GUEST
506 bool "Paravirtualized guest support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100507 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100508 Say Y here to get to see options related to running Linux under
509 various hypervisors. This option alone does not add any kernel code.
510
511 If you say N, all options in this submenu will be skipped and disabled.
512
513if PARAVIRT_GUEST
514
Glauber Costa095c0aa2011-07-11 15:28:18 -0400515config PARAVIRT_TIME_ACCOUNTING
516 bool "Paravirtual steal time accounting"
517 select PARAVIRT
518 default n
519 ---help---
520 Select this option to enable fine granularity task steal time
521 accounting. Time spent executing other tasks in parallel with
522 the current vCPU is discounted from the vCPU power. To account for
523 that, there can be a small performance impact.
524
525 If in doubt, say N here.
526
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100527source "arch/x86/xen/Kconfig"
528
Glauber de Oliveira Costa790c73f2008-02-15 17:52:48 -0200529config KVM_CLOCK
530 bool "KVM paravirtualized clock"
531 select PARAVIRT
Gerd Hoffmannf6e16d52008-06-03 16:17:32 +0200532 select PARAVIRT_CLOCK
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100533 ---help---
Glauber de Oliveira Costa790c73f2008-02-15 17:52:48 -0200534 Turning on this option will allow you to run a paravirtualized clock
535 when running over the KVM hypervisor. Instead of relying on a PIT
536 (or probably other) emulation by the underlying device model, the host
537 provides the guest with timing infrastructure such as time of day, and
538 system time
539
Marcelo Tosatti0cf1bfd2008-02-22 12:21:36 -0500540config KVM_GUEST
541 bool "KVM Guest support"
542 select PARAVIRT
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100543 ---help---
544 This option enables various optimizations for running under the KVM
545 hypervisor.
Marcelo Tosatti0cf1bfd2008-02-22 12:21:36 -0500546
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100547source "arch/x86/lguest/Kconfig"
548
Eduardo Pereira Habkoste61bd942008-01-30 13:33:32 +0100549config PARAVIRT
550 bool "Enable paravirtualization code"
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100551 ---help---
Eduardo Pereira Habkoste61bd942008-01-30 13:33:32 +0100552 This changes the kernel so it can modify itself when it is run
553 under a hypervisor, potentially improving performance significantly
554 over full virtualization. However, when run without a hypervisor
555 the kernel is theoretically slower and slightly larger.
556
Jeremy Fitzhardingeb4ecc122009-05-13 17:16:55 -0700557config PARAVIRT_SPINLOCKS
558 bool "Paravirtualization layer for spinlocks"
559 depends on PARAVIRT && SMP && EXPERIMENTAL
560 ---help---
561 Paravirtualized spinlocks allow a pvops backend to replace the
562 spinlock implementation with something virtualization-friendly
563 (for example, block the virtual CPU rather than spinning).
564
565 Unfortunately the downside is an up to 5% performance hit on
566 native kernels, with various workloads.
567
568 If you are unsure how to answer this question, answer N.
569
Gerd Hoffmann7af192c2008-06-03 16:17:29 +0200570config PARAVIRT_CLOCK
571 bool
Gerd Hoffmann7af192c2008-06-03 16:17:29 +0200572
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100573endif
574
Jeremy Fitzhardinge97349132008-06-25 00:19:14 -0400575config PARAVIRT_DEBUG
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100576 bool "paravirt-ops debugging"
577 depends on PARAVIRT && DEBUG_KERNEL
578 ---help---
579 Enable to debug paravirt_ops internals. Specifically, BUG if
580 a paravirt_op is missing when it is called.
Jeremy Fitzhardinge97349132008-06-25 00:19:14 -0400581
Yinghai Lu08677212010-02-10 01:20:20 -0800582config NO_BOOTMEM
Yinghai Lu774ea0b2010-08-25 13:39:18 -0700583 def_bool y
Yinghai Lu08677212010-02-10 01:20:20 -0800584
Yinghai Lu03273182008-04-18 17:49:15 -0700585config MEMTEST
586 bool "Memtest"
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100587 ---help---
Yinghai Luc64df702008-03-21 18:56:19 -0700588 This option adds a kernel parameter 'memtest', which allows memtest
Yinghai Lu03273182008-04-18 17:49:15 -0700589 to be set.
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100590 memtest=0, mean disabled; -- default
591 memtest=1, mean do 1 test pattern;
592 ...
593 memtest=4, mean do 4 test patterns.
Thomas Gleixneraba37282008-07-15 14:48:48 +0200594 If you are unsure how to answer this question, answer N.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100595
596config X86_SUMMIT_NUMA
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100597 def_bool y
Ingo Molnare0c7ae32009-01-27 18:43:09 +0100598 depends on X86_32 && NUMA && X86_32_NON_STANDARD
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100599
600config X86_CYCLONE_TIMER
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100601 def_bool y
Ingo Molnare0c7ae32009-01-27 18:43:09 +0100602 depends on X86_32_NON_STANDARD
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100603
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100604source "arch/x86/Kconfig.cpu"
605
606config HPET_TIMER
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100607 def_bool X86_64
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100608 prompt "HPET Timer Support" if X86_32
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100609 ---help---
610 Use the IA-PC HPET (High Precision Event Timer) to manage
611 time in preference to the PIT and RTC, if a HPET is
612 present.
613 HPET is the next generation timer replacing legacy 8254s.
614 The HPET provides a stable time base on SMP
615 systems, unlike the TSC, but it is more expensive to access,
616 as it is off-chip. You can find the HPET spec at
617 <http://www.intel.com/hardwaredesign/hpetspec_1.pdf>.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100618
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100619 You can safely choose Y here. However, HPET will only be
620 activated if the platform and the BIOS support this feature.
621 Otherwise the 8254 will be used for timing services.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100622
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100623 Choose N to continue using the legacy 8254 timer.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100624
625config HPET_EMULATE_RTC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100626 def_bool y
Bernhard Walle9d8af782008-02-06 01:38:52 -0800627 depends on HPET_TIMER && (RTC=y || RTC=m || RTC_DRV_CMOS=m || RTC_DRV_CMOS=y)
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100628
Jacob Panbb24c472009-09-02 07:37:17 -0700629config APB_TIMER
630 def_bool y if MRST
631 prompt "Langwell APB Timer Support" if X86_MRST
632 help
633 APB timer is the replacement for 8254, HPET on X86 MID platforms.
634 The APBT provides a stable time base on SMP
635 systems, unlike the TSC, but it is more expensive to access,
636 as it is off-chip. APB timers are always running regardless of CPU
637 C states, they are used as per CPU clockevent device when possible.
638
David Rientjes6a108a12011-01-20 14:44:16 -0800639# Mark as expert because too many people got it wrong.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100640# The code disables itself when not needed.
Thomas Petazzoni7ae93922008-04-28 02:14:14 -0700641config DMI
642 default y
David Rientjes6a108a12011-01-20 14:44:16 -0800643 bool "Enable DMI scanning" if EXPERT
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100644 ---help---
Thomas Petazzoni7ae93922008-04-28 02:14:14 -0700645 Enabled scanning of DMI to identify machine quirks. Say Y
646 here unless you have verified that your setup is not
647 affected by entries in the DMI blacklist. Required by PNP
648 BIOS code.
649
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100650config GART_IOMMU
David Rientjes6a108a12011-01-20 14:44:16 -0800651 bool "GART IOMMU support" if EXPERT
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100652 default y
653 select SWIOTLB
Andreas Herrmann23ac4ae2010-09-17 18:03:43 +0200654 depends on X86_64 && PCI && AMD_NB
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100655 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100656 Support for full DMA access of devices with 32bit memory access only
657 on systems with more than 3GB. This is usually needed for USB,
658 sound, many IDE/SATA chipsets and some other devices.
659 Provides a driver for the AMD Athlon64/Opteron/Turion/Sempron GART
660 based hardware IOMMU and a software bounce buffer based IOMMU used
661 on Intel systems and as fallback.
662 The code is only active when needed (enough memory and limited
663 device) unless CONFIG_IOMMU_DEBUG or iommu=force is specified
664 too.
665
666config CALGARY_IOMMU
667 bool "IBM Calgary IOMMU support"
668 select SWIOTLB
669 depends on X86_64 && PCI && EXPERIMENTAL
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100670 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100671 Support for hardware IOMMUs in IBM's xSeries x366 and x460
672 systems. Needed to run systems with more than 3GB of memory
673 properly with 32-bit PCI devices that do not support DAC
674 (Double Address Cycle). Calgary also supports bus level
675 isolation, where all DMAs pass through the IOMMU. This
676 prevents them from going anywhere except their intended
677 destination. This catches hard-to-find kernel bugs and
678 mis-behaving drivers and devices that do not use the DMA-API
679 properly to set up their DMA buffers. The IOMMU can be
680 turned off at boot time with the iommu=off parameter.
681 Normally the kernel will make the right choice by itself.
682 If unsure, say Y.
683
684config CALGARY_IOMMU_ENABLED_BY_DEFAULT
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100685 def_bool y
686 prompt "Should Calgary be enabled by default?"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100687 depends on CALGARY_IOMMU
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100688 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100689 Should Calgary be enabled by default? if you choose 'y', Calgary
690 will be used (if it exists). If you choose 'n', Calgary will not be
691 used even if it exists. If you choose 'n' and would like to use
692 Calgary anyway, pass 'iommu=calgary' on the kernel command line.
693 If unsure, say Y.
694
Joerg Roedel2b188722008-06-26 21:27:37 +0200695config AMD_IOMMU
696 bool "AMD IOMMU support"
Ingo Molnar07c40e82008-06-27 11:31:28 +0200697 select SWIOTLB
Joerg Roedela80dc3e2008-09-11 16:51:41 +0200698 select PCI_MSI
Joerg Roedel9844b4e2011-04-05 09:22:56 +0200699 select PCI_IOV
Ingo Molnar24d2ba02008-06-27 10:37:03 +0200700 depends on X86_64 && PCI && ACPI
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100701 ---help---
Joerg Roedel18d22202008-07-03 19:35:06 +0200702 With this option you can enable support for AMD IOMMU hardware in
703 your system. An IOMMU is a hardware component which provides
704 remapping of DMA memory accesses from devices. With an AMD IOMMU you
705 can isolate the the DMA memory of different devices and protect the
706 system from misbehaving device drivers or hardware.
707
708 You can find out if your system has an AMD IOMMU if you look into
709 your BIOS for an option to enable it or if you have an IVRS ACPI
710 table.
Joerg Roedel2b188722008-06-26 21:27:37 +0200711
Joerg Roedel2e117602008-12-11 19:00:12 +0100712config AMD_IOMMU_STATS
713 bool "Export AMD IOMMU statistics to debugfs"
714 depends on AMD_IOMMU
715 select DEBUG_FS
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100716 ---help---
Joerg Roedel2e117602008-12-11 19:00:12 +0100717 This option enables code in the AMD IOMMU driver to collect various
718 statistics about whats happening in the driver and exports that
719 information to userspace via debugfs.
720 If unsure, say N.
721
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100722# need this always selected by IOMMU for the VIA workaround
723config SWIOTLB
Joerg Roedela1afd012008-11-18 12:44:21 +0100724 def_bool y if X86_64
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100725 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100726 Support for software bounce buffers used on x86-64 systems
727 which don't have a hardware IOMMU (e.g. the current generation
728 of Intel's x86-64 CPUs). Using this PCI devices which can only
729 access 32-bits of memory can be used on systems with more than
730 3 GB of memory. If unsure, say Y.
731
FUJITA Tomonoria8522502008-04-29 00:59:36 -0700732config IOMMU_HELPER
FUJITA Tomonori18b743d2008-07-10 09:50:50 +0900733 def_bool (CALGARY_IOMMU || GART_IOMMU || SWIOTLB || AMD_IOMMU)
Linus Torvaldsd25e26b2008-08-25 14:15:38 -0700734
Joerg Roedel1aaf1182008-11-26 17:25:13 +0100735config IOMMU_API
736 def_bool (AMD_IOMMU || DMAR)
737
Mike Travis1184dc22008-05-12 21:21:12 +0200738config MAXSMP
Samuel Thibaultddb0c5a2010-08-21 21:32:41 +0200739 bool "Enable Maximum number of SMP Processors and NUMA Nodes"
Mike Travis36f51012008-12-16 17:33:51 -0800740 depends on X86_64 && SMP && DEBUG_KERNEL && EXPERIMENTAL
741 select CPUMASK_OFFSTACK
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100742 ---help---
Samuel Thibaultddb0c5a2010-08-21 21:32:41 +0200743 Enable maximum number of CPUS and NUMA Nodes for this architecture.
Mike Travis1184dc22008-05-12 21:21:12 +0200744 If unsure, say N.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100745
746config NR_CPUS
Mike Travis36f51012008-12-16 17:33:51 -0800747 int "Maximum number of CPUs" if SMP && !MAXSMP
Michael K. Johnson2a3313f2009-04-21 21:44:48 -0400748 range 2 8 if SMP && X86_32 && !X86_BIGSMP
Mike Travis36f51012008-12-16 17:33:51 -0800749 range 2 512 if SMP && !MAXSMP
Mike Travis78637a972008-12-16 17:34:00 -0800750 default "1" if !SMP
Linus Torvaldsd25e26b2008-08-25 14:15:38 -0700751 default "4096" if MAXSMP
Mike Travis78637a972008-12-16 17:34:00 -0800752 default "32" if SMP && (X86_NUMAQ || X86_SUMMIT || X86_BIGSMP || X86_ES7000)
753 default "8" if SMP
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100754 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100755 This allows you to specify the maximum number of CPUs which this
Linus Torvaldsd25e26b2008-08-25 14:15:38 -0700756 kernel will support. The maximum supported value is 512 and the
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100757 minimum value which makes sense is 2.
758
759 This is purely to save memory - each supported CPU adds
760 approximately eight kilobytes to the kernel image.
761
762config SCHED_SMT
763 bool "SMT (Hyperthreading) scheduler support"
Hiroshi Shimamotob089c122008-02-27 13:16:30 -0800764 depends on X86_HT
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100765 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100766 SMT scheduler support improves the CPU scheduler's decision making
767 when dealing with Intel Pentium 4 chips with HyperThreading at a
768 cost of slightly increased overhead in some places. If unsure say
769 N here.
770
771config SCHED_MC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100772 def_bool y
773 prompt "Multi-core scheduler support"
Hiroshi Shimamotob089c122008-02-27 13:16:30 -0800774 depends on X86_HT
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100775 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100776 Multi-core scheduler support improves the CPU scheduler's decision
777 making when dealing with multi-core CPU chips at a cost of slightly
778 increased overhead in some places. If unsure say N here.
779
Venkatesh Pallipadie82b8e42010-10-04 17:03:20 -0700780config IRQ_TIME_ACCOUNTING
781 bool "Fine granularity task level IRQ time accounting"
782 default n
783 ---help---
784 Select this option to enable fine granularity task irq time
785 accounting. This is done by reading a timestamp on each
786 transitions between softirq and hardirq state, so there can be a
787 small performance impact.
788
789 If in doubt, say N here.
790
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100791source "kernel/Kconfig.preempt"
792
793config X86_UP_APIC
794 bool "Local APIC support on uniprocessors"
Ingo Molnare0c7ae32009-01-27 18:43:09 +0100795 depends on X86_32 && !SMP && !X86_32_NON_STANDARD
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100796 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100797 A local APIC (Advanced Programmable Interrupt Controller) is an
798 integrated interrupt controller in the CPU. If you have a single-CPU
799 system which has a processor with a local APIC, you can say Y here to
800 enable and use it. If you say Y here even though your machine doesn't
801 have a local APIC, then the kernel will still run with no slowdown at
802 all. The local APIC supports CPU-generated self-interrupts (timer,
803 performance counters), and the NMI watchdog which detects hard
804 lockups.
805
806config X86_UP_IOAPIC
807 bool "IO-APIC support on uniprocessors"
808 depends on X86_UP_APIC
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100809 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100810 An IO-APIC (I/O Advanced Programmable Interrupt Controller) is an
811 SMP-capable replacement for PC-style interrupt controllers. Most
812 SMP systems and many recent uniprocessor systems have one.
813
814 If you have a single-CPU system with an IO-APIC, you can say Y here
815 to use it. If you say Y here even though your machine doesn't have
816 an IO-APIC, then the kernel will still run with no slowdown at all.
817
818config X86_LOCAL_APIC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100819 def_bool y
Ingo Molnare0c7ae32009-01-27 18:43:09 +0100820 depends on X86_64 || SMP || X86_32_NON_STANDARD || X86_UP_APIC
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100821
822config X86_IO_APIC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100823 def_bool y
Henrik Kretzschmar1444e0c2011-02-22 15:38:07 +0100824 depends on X86_64 || SMP || X86_32_NON_STANDARD || X86_UP_IOAPIC
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100825
826config X86_VISWS_APIC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100827 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100828 depends on X86_32 && X86_VISWS
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100829
Stefan Assmann41b9eb22008-07-15 13:48:55 +0200830config X86_REROUTE_FOR_BROKEN_BOOT_IRQS
831 bool "Reroute for broken boot IRQs"
Stefan Assmann41b9eb22008-07-15 13:48:55 +0200832 depends on X86_IO_APIC
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100833 ---help---
Stefan Assmann41b9eb22008-07-15 13:48:55 +0200834 This option enables a workaround that fixes a source of
835 spurious interrupts. This is recommended when threaded
836 interrupt handling is used on systems where the generation of
837 superfluous "boot interrupts" cannot be disabled.
838
839 Some chipsets generate a legacy INTx "boot IRQ" when the IRQ
840 entry in the chipset's IO-APIC is masked (as, e.g. the RT
841 kernel does during interrupt handling). On chipsets where this
842 boot IRQ generation cannot be disabled, this workaround keeps
843 the original IRQ line masked so that only the equivalent "boot
844 IRQ" is delivered to the CPUs. The workaround also tells the
845 kernel to set up the IRQ handler on the boot IRQ line. In this
846 way only one interrupt is delivered to the kernel. Otherwise
847 the spurious second interrupt may cause the kernel to bring
848 down (vital) interrupt lines.
849
850 Only affects "broken" chipsets. Interrupt sharing may be
851 increased on these systems.
852
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100853config X86_MCE
Andi Kleenbab9bc62009-07-09 00:31:38 +0200854 bool "Machine Check / overheating reporting"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100855 ---help---
Andi Kleenbab9bc62009-07-09 00:31:38 +0200856 Machine Check support allows the processor to notify the
857 kernel if it detects a problem (e.g. overheating, data corruption).
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100858 The action the kernel takes depends on the severity of the problem,
Andi Kleenbab9bc62009-07-09 00:31:38 +0200859 ranging from warning messages to halting the machine.
Andi Kleen4efc0672009-04-28 19:07:31 +0200860
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100861config X86_MCE_INTEL
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100862 def_bool y
863 prompt "Intel MCE features"
Andi Kleenc1ebf832009-07-09 00:31:41 +0200864 depends on X86_MCE && X86_LOCAL_APIC
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100865 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100866 Additional support for intel specific MCE features such as
867 the thermal monitor.
868
869config X86_MCE_AMD
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100870 def_bool y
871 prompt "AMD MCE features"
Andi Kleenc1ebf832009-07-09 00:31:41 +0200872 depends on X86_MCE && X86_LOCAL_APIC
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100873 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100874 Additional support for AMD specific MCE features such as
875 the DRAM Error Threshold.
876
Andi Kleen4efc0672009-04-28 19:07:31 +0200877config X86_ANCIENT_MCE
Jan Beulich6fc108a2010-04-21 15:23:44 +0100878 bool "Support for old Pentium 5 / WinChip machine checks"
Andi Kleenc31d9632009-07-09 00:31:37 +0200879 depends on X86_32 && X86_MCE
Hidetoshi Setocd13adcc2009-05-27 16:57:31 +0900880 ---help---
881 Include support for machine check handling on old Pentium 5 or WinChip
882 systems. These typically need to be enabled explicitely on the command
883 line.
Andi Kleen4efc0672009-04-28 19:07:31 +0200884
Andi Kleenb2762682009-02-12 13:49:31 +0100885config X86_MCE_THRESHOLD
886 depends on X86_MCE_AMD || X86_MCE_INTEL
Jan Beulich6fc108a2010-04-21 15:23:44 +0100887 def_bool y
Andi Kleenb2762682009-02-12 13:49:31 +0100888
Andi Kleenea149b32009-04-29 19:31:00 +0200889config X86_MCE_INJECT
Andi Kleenc1ebf832009-07-09 00:31:41 +0200890 depends on X86_MCE
Andi Kleenea149b32009-04-29 19:31:00 +0200891 tristate "Machine check injector support"
892 ---help---
893 Provide support for injecting machine checks for testing purposes.
894 If you don't know what a machine check is and you don't do kernel
895 QA it is safe to say n.
896
Andi Kleen4efc0672009-04-28 19:07:31 +0200897config X86_THERMAL_VECTOR
898 def_bool y
Andi Kleen5bb38ad2009-07-09 00:31:39 +0200899 depends on X86_MCE_INTEL
Andi Kleen4efc0672009-04-28 19:07:31 +0200900
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100901config VM86
David Rientjes6a108a12011-01-20 14:44:16 -0800902 bool "Enable VM86 support" if EXPERT
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100903 default y
904 depends on X86_32
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100905 ---help---
906 This option is required by programs like DOSEMU to run 16-bit legacy
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100907 code on X86 processors. It also may be needed by software like
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100908 XFree86 to initialize some video cards via BIOS. Disabling this
909 option saves about 6k.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100910
911config TOSHIBA
912 tristate "Toshiba Laptop support"
913 depends on X86_32
914 ---help---
915 This adds a driver to safely access the System Management Mode of
916 the CPU on Toshiba portables with a genuine Toshiba BIOS. It does
917 not work on models with a Phoenix BIOS. The System Management Mode
918 is used to set the BIOS and power saving options on Toshiba portables.
919
920 For information on utilities to make use of this driver see the
921 Toshiba Linux utilities web site at:
922 <http://www.buzzard.org.uk/toshiba/>.
923
924 Say Y if you intend to run this kernel on a Toshiba portable.
925 Say N otherwise.
926
927config I8K
928 tristate "Dell laptop support"
Jean Delvare949a9d72011-05-25 20:43:33 +0200929 select HWMON
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100930 ---help---
931 This adds a driver to safely access the System Management Mode
932 of the CPU on the Dell Inspiron 8000. The System Management Mode
933 is used to read cpu temperature and cooling fan status and to
934 control the fans on the I8K portables.
935
936 This driver has been tested only on the Inspiron 8000 but it may
937 also work with other Dell laptops. You can force loading on other
938 models by passing the parameter `force=1' to the module. Use at
939 your own risk.
940
941 For information on utilities to make use of this driver see the
942 I8K Linux utilities web site at:
943 <http://people.debian.org/~dz/i8k/>
944
945 Say Y if you intend to run this kernel on a Dell Inspiron 8000.
946 Say N otherwise.
947
948config X86_REBOOTFIXUPS
Jan Beulich9ba16082008-10-15 22:01:38 -0700949 bool "Enable X86 board specific fixups for reboot"
950 depends on X86_32
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100951 ---help---
952 This enables chipset and/or board specific fixups to be done
953 in order to get reboot to work correctly. This is only needed on
954 some combinations of hardware and BIOS. The symptom, for which
955 this config is intended, is when reboot ends with a stalled/hung
956 system.
957
958 Currently, the only fixup is for the Geode machines using
Florian Fainelli5e3a77e2008-01-30 13:33:36 +0100959 CS5530A and CS5536 chipsets and the RDC R-321x SoC.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100960
961 Say Y if you want to enable the fixup. Currently, it's safe to
962 enable this option even if you don't need it.
963 Say N otherwise.
964
965config MICROCODE
Peter Oruba8d86f392008-07-28 18:44:21 +0200966 tristate "/dev/cpu/microcode - microcode support"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100967 select FW_LOADER
968 ---help---
969 If you say Y here, you will be able to update the microcode on
Peter Oruba80cc9f12008-07-28 18:44:22 +0200970 certain Intel and AMD processors. The Intel support is for the
971 IA32 family, e.g. Pentium Pro, Pentium II, Pentium III,
972 Pentium 4, Xeon etc. The AMD support is for family 0x10 and
973 0x11 processors, e.g. Opteron, Phenom and Turion 64 Ultra.
974 You will obviously need the actual microcode binary data itself
975 which is not shipped with the Linux kernel.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100976
Peter Oruba8d86f392008-07-28 18:44:21 +0200977 This option selects the general module only, you need to select
978 at least one vendor specific module as well.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100979
980 To compile this driver as a module, choose M here: the
981 module will be called microcode.
982
Peter Oruba8d86f392008-07-28 18:44:21 +0200983config MICROCODE_INTEL
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100984 bool "Intel microcode patch loading support"
985 depends on MICROCODE
986 default MICROCODE
987 select FW_LOADER
988 ---help---
989 This options enables microcode patch loading support for Intel
990 processors.
Peter Oruba8d86f392008-07-28 18:44:21 +0200991
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100992 For latest news and information on obtaining all the required
993 Intel ingredients for this driver, check:
994 <http://www.urbanmyth.org/microcode/>.
Peter Oruba8d86f392008-07-28 18:44:21 +0200995
Peter Oruba80cc9f12008-07-28 18:44:22 +0200996config MICROCODE_AMD
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100997 bool "AMD microcode patch loading support"
998 depends on MICROCODE
999 select FW_LOADER
1000 ---help---
1001 If you select this option, microcode patch loading support for AMD
1002 processors will be enabled.
Peter Oruba80cc9f12008-07-28 18:44:22 +02001003
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001004config MICROCODE_OLD_INTERFACE
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001005 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001006 depends on MICROCODE
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001007
1008config X86_MSR
1009 tristate "/dev/cpu/*/msr - Model-specific register support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001010 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001011 This device gives privileged processes access to the x86
1012 Model-Specific Registers (MSRs). It is a character device with
1013 major 202 and minors 0 to 31 for /dev/cpu/0/msr to /dev/cpu/31/msr.
1014 MSR accesses are directed to a specific CPU on multi-processor
1015 systems.
1016
1017config X86_CPUID
1018 tristate "/dev/cpu/*/cpuid - CPU information support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001019 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001020 This device gives processes access to the x86 CPUID instruction to
1021 be executed on a specific processor. It is a character device
1022 with major 203 and minors 0 to 31 for /dev/cpu/0/cpuid to
1023 /dev/cpu/31/cpuid.
1024
1025choice
1026 prompt "High Memory Support"
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001027 default HIGHMEM64G if X86_NUMAQ
Jan Beulich6fc108a2010-04-21 15:23:44 +01001028 default HIGHMEM4G
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001029 depends on X86_32
1030
1031config NOHIGHMEM
1032 bool "off"
1033 depends on !X86_NUMAQ
1034 ---help---
1035 Linux can use up to 64 Gigabytes of physical memory on x86 systems.
1036 However, the address space of 32-bit x86 processors is only 4
1037 Gigabytes large. That means that, if you have a large amount of
1038 physical memory, not all of it can be "permanently mapped" by the
1039 kernel. The physical memory that's not permanently mapped is called
1040 "high memory".
1041
1042 If you are compiling a kernel which will never run on a machine with
1043 more than 1 Gigabyte total physical RAM, answer "off" here (default
1044 choice and suitable for most users). This will result in a "3GB/1GB"
1045 split: 3GB are mapped so that each process sees a 3GB virtual memory
1046 space and the remaining part of the 4GB virtual memory space is used
1047 by the kernel to permanently map as much physical memory as
1048 possible.
1049
1050 If the machine has between 1 and 4 Gigabytes physical RAM, then
1051 answer "4GB" here.
1052
1053 If more than 4 Gigabytes is used then answer "64GB" here. This
1054 selection turns Intel PAE (Physical Address Extension) mode on.
1055 PAE implements 3-level paging on IA32 processors. PAE is fully
1056 supported by Linux, PAE mode is implemented on all recent Intel
1057 processors (Pentium Pro and better). NOTE: If you say "64GB" here,
1058 then the kernel will not boot on CPUs that don't support PAE!
1059
1060 The actual amount of total physical memory will either be
1061 auto detected or can be forced by using a kernel command line option
1062 such as "mem=256M". (Try "man bootparam" or see the documentation of
1063 your boot loader (lilo or loadlin) about how to pass options to the
1064 kernel at boot time.)
1065
1066 If unsure, say "off".
1067
1068config HIGHMEM4G
1069 bool "4GB"
1070 depends on !X86_NUMAQ
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 between 1 and 4
1073 gigabytes of physical RAM.
1074
1075config HIGHMEM64G
1076 bool "64GB"
1077 depends on !M386 && !M486
1078 select X86_PAE
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001079 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001080 Select this if you have a 32-bit processor and more than 4
1081 gigabytes of physical RAM.
1082
1083endchoice
1084
1085choice
1086 depends on EXPERIMENTAL
David Rientjes6a108a12011-01-20 14:44:16 -08001087 prompt "Memory split" if EXPERT
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001088 default VMSPLIT_3G
1089 depends on X86_32
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001090 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001091 Select the desired split between kernel and user memory.
1092
1093 If the address range available to the kernel is less than the
1094 physical memory installed, the remaining memory will be available
1095 as "high memory". Accessing high memory is a little more costly
1096 than low memory, as it needs to be mapped into the kernel first.
1097 Note that increasing the kernel address space limits the range
1098 available to user programs, making the address space there
1099 tighter. Selecting anything other than the default 3G/1G split
1100 will also likely make your kernel incompatible with binary-only
1101 kernel modules.
1102
1103 If you are not absolutely sure what you are doing, leave this
1104 option alone!
1105
1106 config VMSPLIT_3G
1107 bool "3G/1G user/kernel split"
1108 config VMSPLIT_3G_OPT
1109 depends on !X86_PAE
1110 bool "3G/1G user/kernel split (for full 1G low memory)"
1111 config VMSPLIT_2G
1112 bool "2G/2G user/kernel split"
1113 config VMSPLIT_2G_OPT
1114 depends on !X86_PAE
1115 bool "2G/2G user/kernel split (for full 2G low memory)"
1116 config VMSPLIT_1G
1117 bool "1G/3G user/kernel split"
1118endchoice
1119
1120config PAGE_OFFSET
1121 hex
1122 default 0xB0000000 if VMSPLIT_3G_OPT
1123 default 0x80000000 if VMSPLIT_2G
1124 default 0x78000000 if VMSPLIT_2G_OPT
1125 default 0x40000000 if VMSPLIT_1G
1126 default 0xC0000000
1127 depends on X86_32
1128
1129config HIGHMEM
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001130 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001131 depends on X86_32 && (HIGHMEM64G || HIGHMEM4G)
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001132
1133config X86_PAE
Jan Beulich9ba16082008-10-15 22:01:38 -07001134 bool "PAE (Physical Address Extension) Support"
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001135 depends on X86_32 && !HIGHMEM4G
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001136 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001137 PAE is required for NX support, and furthermore enables
1138 larger swapspace support for non-overcommit purposes. It
1139 has the cost of more pagetable lookup overhead, and also
1140 consumes more pagetable space per process.
1141
Jeremy Fitzhardinge600715d2008-09-11 01:31:45 -07001142config ARCH_PHYS_ADDR_T_64BIT
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001143 def_bool X86_64 || X86_PAE
Jeremy Fitzhardinge600715d2008-09-11 01:31:45 -07001144
FUJITA Tomonori66f2b062010-10-20 15:55:35 -07001145config ARCH_DMA_ADDR_T_64BIT
1146 def_bool X86_64 || HIGHMEM64G
1147
Nick Piggin9e899812008-10-22 12:33:16 +02001148config DIRECT_GBPAGES
David Rientjes6a108a12011-01-20 14:44:16 -08001149 bool "Enable 1GB pages for kernel pagetables" if EXPERT
Nick Piggin9e899812008-10-22 12:33:16 +02001150 default y
1151 depends on X86_64
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001152 ---help---
Nick Piggin9e899812008-10-22 12:33:16 +02001153 Allow the kernel linear mapping to use 1GB pages on CPUs that
1154 support it. This can improve the kernel's performance a tiny bit by
1155 reducing TLB pressure. If in doubt, say "Y".
1156
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001157# Common NUMA Features
1158config NUMA
KOSAKI Motohirofd51b2d2008-11-05 02:27:19 +09001159 bool "Numa Memory Allocation and Scheduler Support"
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001160 depends on SMP
Rafael J. Wysocki604d2052008-11-12 23:26:14 +01001161 depends on X86_64 || (X86_32 && HIGHMEM64G && (X86_NUMAQ || X86_BIGSMP || X86_SUMMIT && ACPI) && EXPERIMENTAL)
Yinghai Lu0699eae2008-06-17 15:39:01 -07001162 default y if (X86_NUMAQ || X86_SUMMIT || X86_BIGSMP)
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001163 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001164 Enable NUMA (Non Uniform Memory Access) support.
KOSAKI Motohirofd51b2d2008-11-05 02:27:19 +09001165
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001166 The kernel will try to allocate memory used by a CPU on the
1167 local memory controller of the CPU and add some more
1168 NUMA awareness to the kernel.
1169
Ingo Molnarc280ea52008-11-08 13:29:45 +01001170 For 64-bit this is recommended if the system is Intel Core i7
KOSAKI Motohirofd51b2d2008-11-05 02:27:19 +09001171 (or later), AMD Opteron, or EM64T NUMA.
1172
1173 For 32-bit this is only needed on (rare) 32-bit-only platforms
1174 that support NUMA topologies, such as NUMAQ / Summit, or if you
1175 boot a 32-bit kernel on a 64-bit NUMA platform.
1176
1177 Otherwise, you should say N.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001178
1179comment "NUMA (Summit) requires SMP, 64GB highmem support, ACPI"
1180 depends on X86_32 && X86_SUMMIT && (!HIGHMEM64G || !ACPI)
1181
Hans Rosenfeldeec1d4f2010-10-29 17:14:30 +02001182config AMD_NUMA
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001183 def_bool y
1184 prompt "Old style AMD Opteron NUMA detection"
Tejun Heo2706a0b2011-05-02 17:24:48 +02001185 depends on NUMA && PCI
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001186 ---help---
Hans Rosenfeldeec1d4f2010-10-29 17:14:30 +02001187 Enable AMD NUMA node topology detection. You should say Y here if
1188 you have a multi processor AMD system. This uses an old method to
1189 read the NUMA configuration directly from the builtin Northbridge
1190 of Opteron. It is recommended to use X86_64_ACPI_NUMA instead,
1191 which also takes priority if both are compiled in.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001192
1193config X86_64_ACPI_NUMA
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001194 def_bool y
1195 prompt "ACPI NUMA detection"
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001196 depends on X86_64 && NUMA && ACPI && PCI
1197 select ACPI_NUMA
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001198 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001199 Enable ACPI SRAT based node topology detection.
1200
Suresh Siddha6ec6e0d2008-03-25 10:14:35 -07001201# Some NUMA nodes have memory ranges that span
1202# other nodes. Even though a pfn is valid and
1203# between a node's start and end pfns, it may not
1204# reside on that node. See memmap_init_zone()
1205# for details.
1206config NODES_SPAN_OTHER_NODES
1207 def_bool y
1208 depends on X86_64_ACPI_NUMA
1209
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001210config NUMA_EMU
1211 bool "NUMA emulation"
Tejun Heo1b7e03e2011-05-02 17:24:48 +02001212 depends on NUMA
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001213 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001214 Enable NUMA emulation. A flat machine will be split
1215 into virtual nodes when booted with "numa=fake=N", where N is the
1216 number of nodes. This is only useful for debugging.
1217
1218config NODES_SHIFT
Linus Torvaldsd25e26b2008-08-25 14:15:38 -07001219 int "Maximum NUMA Nodes (as a power of 2)" if !MAXSMP
David Rientjes51591e32010-03-25 15:39:27 -07001220 range 1 10
1221 default "10" if MAXSMP
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001222 default "6" if X86_64
1223 default "4" if X86_NUMAQ
1224 default "3"
1225 depends on NEED_MULTIPLE_NODES
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001226 ---help---
Mike Travis1184dc22008-05-12 21:21:12 +02001227 Specify the maximum number of NUMA Nodes available on the target
Matt LaPlante692105b2009-01-26 11:12:25 +01001228 system. Increases memory reserved to accommodate various tables.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001229
Tejun Heoc1329372009-02-24 11:57:20 +09001230config HAVE_ARCH_BOOTMEM
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001231 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001232 depends on X86_32 && NUMA
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001233
Tejun Heo3b166512011-04-01 11:15:12 +02001234config HAVE_ARCH_ALLOC_REMAP
1235 def_bool y
1236 depends on X86_32 && NUMA
1237
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001238config ARCH_HAVE_MEMORY_PRESENT
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001239 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001240 depends on X86_32 && DISCONTIGMEM
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001241
1242config NEED_NODE_MEMMAP_SIZE
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001243 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001244 depends on X86_32 && (DISCONTIGMEM || SPARSEMEM)
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001245
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001246config ARCH_FLATMEM_ENABLE
1247 def_bool y
Tejun Heo3b166512011-04-01 11:15:12 +02001248 depends on X86_32 && !NUMA
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001249
1250config ARCH_DISCONTIGMEM_ENABLE
1251 def_bool y
Christoph Lameterb2632952008-01-30 13:30:47 +01001252 depends on NUMA && X86_32
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001253
1254config ARCH_DISCONTIGMEM_DEFAULT
1255 def_bool y
Christoph Lameterb2632952008-01-30 13:30:47 +01001256 depends on NUMA && X86_32
1257
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001258config 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
Tejun Heo3b166512011-04-01 11:15:12 +02001264config ARCH_SPARSEMEM_DEFAULT
1265 def_bool y
1266 depends on X86_64
1267
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001268config ARCH_SELECT_MEMORY_MODEL
1269 def_bool y
Christoph Lameterb2632952008-01-30 13:30:47 +01001270 depends on ARCH_SPARSEMEM_ENABLE
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001271
1272config ARCH_MEMORY_PROBE
1273 def_bool X86_64
1274 depends on MEMORY_HOTPLUG
1275
Tejun Heo3b166512011-04-01 11:15:12 +02001276config ARCH_PROC_KCORE_TEXT
1277 def_bool y
1278 depends on X86_64 && PROC_KCORE
1279
Avi Kivitya29815a2010-01-10 16:28:09 +02001280config ILLEGAL_POINTER_VALUE
1281 hex
1282 default 0 if X86_32
1283 default 0xdead000000000000 if X86_64
1284
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001285source "mm/Kconfig"
1286
1287config HIGHPTE
1288 bool "Allocate 3rd-level pagetables from highmem"
Jan Beulich6fc108a2010-04-21 15:23:44 +01001289 depends on HIGHMEM
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001290 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001291 The VM uses one page table entry for each page of physical memory.
1292 For systems with a lot of RAM, this can be wasteful of precious
1293 low memory. Setting this option will put user-space page table
1294 entries in high memory.
1295
Jeremy Fitzhardinge9f077872008-09-07 01:51:34 -07001296config X86_CHECK_BIOS_CORRUPTION
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001297 bool "Check for low memory corruption"
1298 ---help---
1299 Periodically check for memory corruption in low memory, which
1300 is suspected to be caused by BIOS. Even when enabled in the
1301 configuration, it is disabled at runtime. Enable it by
1302 setting "memory_corruption_check=1" on the kernel command
1303 line. By default it scans the low 64k of memory every 60
1304 seconds; see the memory_corruption_check_size and
1305 memory_corruption_check_period parameters in
1306 Documentation/kernel-parameters.txt to adjust this.
Jeremy Fitzhardinge9f077872008-09-07 01:51:34 -07001307
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001308 When enabled with the default parameters, this option has
1309 almost no overhead, as it reserves a relatively small amount
1310 of memory and scans it infrequently. It both detects corruption
1311 and prevents it from affecting the running system.
Jeremy Fitzhardinge9f077872008-09-07 01:51:34 -07001312
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001313 It is, however, intended as a diagnostic tool; if repeatable
1314 BIOS-originated corruption always affects the same memory,
1315 you can use memmap= to prevent the kernel from using that
1316 memory.
Jeremy Fitzhardinge9f077872008-09-07 01:51:34 -07001317
Jeremy Fitzhardingec885df52008-09-07 02:37:32 -07001318config X86_BOOTPARAM_MEMORY_CORRUPTION_CHECK
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001319 bool "Set the default setting of memory_corruption_check"
Jeremy Fitzhardingec885df52008-09-07 02:37:32 -07001320 depends on X86_CHECK_BIOS_CORRUPTION
1321 default y
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001322 ---help---
1323 Set whether the default state of memory_corruption_check is
1324 on or off.
Jeremy Fitzhardingec885df52008-09-07 02:37:32 -07001325
H. Peter Anvin9ea77bd2010-08-25 16:38:20 -07001326config X86_RESERVE_LOW
H. Peter Anvind0cd7422010-08-24 17:32:04 -07001327 int "Amount of low memory, in kilobytes, to reserve for the BIOS"
1328 default 64
1329 range 4 640
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001330 ---help---
H. Peter Anvind0cd7422010-08-24 17:32:04 -07001331 Specify the amount of low memory to reserve for the BIOS.
Ingo Molnarfc381512008-09-16 10:07:34 +02001332
H. Peter Anvind0cd7422010-08-24 17:32:04 -07001333 The first page contains BIOS data structures that the kernel
1334 must not use, so that page must always be reserved.
Ingo Molnarfc381512008-09-16 10:07:34 +02001335
H. Peter Anvind0cd7422010-08-24 17:32:04 -07001336 By default we reserve the first 64K of physical RAM, as a
1337 number of BIOSes are known to corrupt that memory range
1338 during events such as suspend/resume or monitor cable
1339 insertion, so it must not be used by the kernel.
Ingo Molnarfc381512008-09-16 10:07:34 +02001340
H. Peter Anvind0cd7422010-08-24 17:32:04 -07001341 You can set this to 4 if you are absolutely sure that you
1342 trust the BIOS to get all its memory reservations and usages
1343 right. If you know your BIOS have problems beyond the
1344 default 64K area, you can set this to 640 to avoid using the
1345 entire low memory range.
1346
1347 If you have doubts about the BIOS (e.g. suspend/resume does
1348 not work or there's kernel crashes after certain hardware
1349 hotplug events) then you might want to enable
1350 X86_CHECK_BIOS_CORRUPTION=y to allow the kernel to check
1351 typical corruption patterns.
1352
1353 Leave this to the default value of 64 if you are unsure.
Ingo Molnarfc381512008-09-16 10:07:34 +02001354
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001355config MATH_EMULATION
1356 bool
1357 prompt "Math emulation" if X86_32
1358 ---help---
1359 Linux can emulate a math coprocessor (used for floating point
1360 operations) if you don't have one. 486DX and Pentium processors have
1361 a math coprocessor built in, 486SX and 386 do not, unless you added
1362 a 487DX or 387, respectively. (The messages during boot time can
1363 give you some hints here ["man dmesg"].) Everyone needs either a
1364 coprocessor or this emulation.
1365
1366 If you don't have a math coprocessor, you need to say Y here; if you
1367 say Y here even though you have a coprocessor, the coprocessor will
1368 be used nevertheless. (This behavior can be changed with the kernel
1369 command line option "no387", which comes handy if your coprocessor
1370 is broken. Try "man bootparam" or see the documentation of your boot
1371 loader (lilo or loadlin) about how to pass options to the kernel at
1372 boot time.) This means that it is a good idea to say Y here if you
1373 intend to use this kernel on different machines.
1374
1375 More information about the internals of the Linux math coprocessor
1376 emulation can be found in <file:arch/x86/math-emu/README>.
1377
1378 If you are not sure, say Y; apart from resulting in a 66 KB bigger
1379 kernel, it won't hurt.
1380
1381config MTRR
Jan Beulich6fc108a2010-04-21 15:23:44 +01001382 def_bool y
David Rientjes6a108a12011-01-20 14:44:16 -08001383 prompt "MTRR (Memory Type Range Register) support" if EXPERT
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001384 ---help---
1385 On Intel P6 family processors (Pentium Pro, Pentium II and later)
1386 the Memory Type Range Registers (MTRRs) may be used to control
1387 processor access to memory ranges. This is most useful if you have
1388 a video (VGA) card on a PCI or AGP bus. Enabling write-combining
1389 allows bus write transfers to be combined into a larger transfer
1390 before bursting over the PCI/AGP bus. This can increase performance
1391 of image write operations 2.5 times or more. Saying Y here creates a
1392 /proc/mtrr file which may be used to manipulate your processor's
1393 MTRRs. Typically the X server should use this.
1394
1395 This code has a reasonably generic interface so that similar
1396 control registers on other processors can be easily supported
1397 as well:
1398
1399 The Cyrix 6x86, 6x86MX and M II processors have Address Range
1400 Registers (ARRs) which provide a similar functionality to MTRRs. For
1401 these, the ARRs are used to emulate the MTRRs.
1402 The AMD K6-2 (stepping 8 and above) and K6-3 processors have two
1403 MTRRs. The Centaur C6 (WinChip) has 8 MCRs, allowing
1404 write-combining. All of these processors are supported by this code
1405 and it makes sense to say Y here if you have one of them.
1406
1407 Saying Y here also fixes a problem with buggy SMP BIOSes which only
1408 set the MTRRs for the boot CPU and not for the secondary CPUs. This
1409 can lead to all sorts of problems, so it's good to say Y here.
1410
1411 You can safely say Y even if your machine doesn't have MTRRs, you'll
1412 just add about 9 KB to your kernel.
1413
Randy Dunlap7225e752008-07-26 17:54:22 -07001414 See <file:Documentation/x86/mtrr.txt> for more information.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001415
Yinghai Lu95ffa242008-04-29 03:52:33 -07001416config MTRR_SANITIZER
Yinghai Lu2ffb3502008-09-30 16:29:40 -07001417 def_bool y
Yinghai Lu95ffa242008-04-29 03:52:33 -07001418 prompt "MTRR cleanup support"
1419 depends on MTRR
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001420 ---help---
Thomas Gleixneraba37282008-07-15 14:48:48 +02001421 Convert MTRR layout from continuous to discrete, so X drivers can
1422 add writeback entries.
Yinghai Lu95ffa242008-04-29 03:52:33 -07001423
Thomas Gleixneraba37282008-07-15 14:48:48 +02001424 Can be disabled with disable_mtrr_cleanup on the kernel command line.
Matt LaPlante692105b2009-01-26 11:12:25 +01001425 The largest mtrr entry size for a continuous block can be set with
Thomas Gleixneraba37282008-07-15 14:48:48 +02001426 mtrr_chunk_size.
Yinghai Lu95ffa242008-04-29 03:52:33 -07001427
Yinghai Lu2ffb3502008-09-30 16:29:40 -07001428 If unsure, say Y.
Yinghai Lu95ffa242008-04-29 03:52:33 -07001429
1430config MTRR_SANITIZER_ENABLE_DEFAULT
Yinghai Luf5098d62008-04-29 20:25:58 -07001431 int "MTRR cleanup enable value (0-1)"
1432 range 0 1
1433 default "0"
Yinghai Lu95ffa242008-04-29 03:52:33 -07001434 depends on MTRR_SANITIZER
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001435 ---help---
Yinghai Luf5098d62008-04-29 20:25:58 -07001436 Enable mtrr cleanup default value
Yinghai Lu95ffa242008-04-29 03:52:33 -07001437
Yinghai Lu12031a62008-05-02 02:40:22 -07001438config MTRR_SANITIZER_SPARE_REG_NR_DEFAULT
1439 int "MTRR cleanup spare reg num (0-7)"
1440 range 0 7
1441 default "1"
1442 depends on MTRR_SANITIZER
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001443 ---help---
Yinghai Lu12031a62008-05-02 02:40:22 -07001444 mtrr cleanup spare entries default, it can be changed via
Thomas Gleixneraba37282008-07-15 14:48:48 +02001445 mtrr_spare_reg_nr=N on the kernel command line.
Yinghai Lu12031a62008-05-02 02:40:22 -07001446
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001447config X86_PAT
Jan Beulich6fc108a2010-04-21 15:23:44 +01001448 def_bool y
David Rientjes6a108a12011-01-20 14:44:16 -08001449 prompt "x86 PAT support" if EXPERT
Ingo Molnar2a8a2712008-04-26 10:26:52 +02001450 depends on MTRR
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001451 ---help---
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001452 Use PAT attributes to setup page level cache control.
Venki Pallipadi042b78e2008-03-24 14:22:35 -07001453
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001454 PATs are the modern equivalents of MTRRs and are much more
1455 flexible than MTRRs.
1456
1457 Say N here if you see bootup problems (boot crash, boot hang,
Venki Pallipadi042b78e2008-03-24 14:22:35 -07001458 spontaneous reboots) or a non-working video driver.
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001459
1460 If unsure, say Y.
1461
Venkatesh Pallipadi46cf98c2009-07-10 09:57:37 -07001462config ARCH_USES_PG_UNCACHED
1463 def_bool y
1464 depends on X86_PAT
1465
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001466config EFI
Jan Beulich9ba16082008-10-15 22:01:38 -07001467 bool "EFI runtime service support"
Huang, Ying5b836832008-01-30 13:31:19 +01001468 depends on ACPI
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001469 ---help---
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001470 This enables the kernel to use EFI runtime services that are
1471 available (such as the EFI variable services).
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001472
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001473 This option is only useful on systems that have EFI firmware.
1474 In addition, you should use the latest ELILO loader available
1475 at <http://elilo.sourceforge.net> in order to take advantage
1476 of EFI runtime services. However, even with this option, the
1477 resultant kernel should continue to boot on existing non-EFI
1478 platforms.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001479
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001480config SECCOMP
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001481 def_bool y
1482 prompt "Enable seccomp to safely compute untrusted bytecode"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001483 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001484 This kernel feature is useful for number crunching applications
1485 that may need to compute untrusted bytecode during their
1486 execution. By using pipes or other transports made available to
1487 the process as file descriptors supporting the read/write
1488 syscalls, it's possible to isolate those applications in
1489 their own address space using seccomp. Once seccomp is
Alexey Dobriyan9c0bbee2008-09-09 11:01:31 +04001490 enabled via prctl(PR_SET_SECCOMP), it cannot be disabled
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001491 and the task is only allowed to execute a few safe syscalls
1492 defined by each seccomp mode.
1493
1494 If unsure, say Y. Only embedded should say N here.
1495
1496config CC_STACKPROTECTOR
1497 bool "Enable -fstack-protector buffer overflow detection (EXPERIMENTAL)"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001498 ---help---
1499 This option turns on the -fstack-protector GCC feature. This
Ingo Molnar113c5412008-02-14 10:36:03 +01001500 feature puts, at the beginning of functions, a canary value on
1501 the stack just before the return address, and validates
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001502 the value just before actually returning. Stack based buffer
1503 overflows (that need to overwrite this return address) now also
1504 overwrite the canary, which gets detected and the attack is then
1505 neutralized via a kernel panic.
1506
1507 This feature requires gcc version 4.2 or above, or a distribution
1508 gcc with the feature backported. Older versions are automatically
Ingo Molnar113c5412008-02-14 10:36:03 +01001509 detected and for those versions, this configuration option is
1510 ignored. (and a warning is printed during bootup)
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001511
1512source kernel/Kconfig.hz
1513
1514config KEXEC
1515 bool "kexec system call"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001516 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001517 kexec is a system call that implements the ability to shutdown your
1518 current kernel, and to start another kernel. It is like a reboot
1519 but it is independent of the system firmware. And like a reboot
1520 you can start any kernel with it, not just Linux.
1521
1522 The name comes from the similarity to the exec system call.
1523
1524 It is an ongoing process to be certain the hardware in a machine
1525 is properly shutdown, so do not be surprised if this code does not
1526 initially work for you. It may help to enable device hotplugging
1527 support. As of this writing the exact hardware interface is
1528 strongly in flux, so no good recommendation can be made.
1529
1530config CRASH_DUMP
Pavel Machek04b69442008-08-14 17:16:50 +02001531 bool "kernel crash dumps"
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001532 depends on X86_64 || (X86_32 && HIGHMEM)
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001533 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001534 Generate crash dump after being started by kexec.
1535 This should be normally only set in special crash dump kernels
1536 which are loaded in the main kernel with kexec-tools into
1537 a specially reserved region and then later executed after
1538 a crash by kdump/kexec. The crash dump kernel must be compiled
1539 to a memory address not used by the main kernel or BIOS using
1540 PHYSICAL_START, or it must be built as a relocatable image
1541 (CONFIG_RELOCATABLE=y).
1542 For more details see Documentation/kdump/kdump.txt
1543
Huang Ying3ab83522008-07-25 19:45:07 -07001544config KEXEC_JUMP
1545 bool "kexec jump (EXPERIMENTAL)"
1546 depends on EXPERIMENTAL
Huang Yingfee7b0d2009-03-10 10:57:16 +08001547 depends on KEXEC && HIBERNATION
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001548 ---help---
Huang Ying89081d12008-07-25 19:45:10 -07001549 Jump between original kernel and kexeced kernel and invoke
1550 code in physical address mode via KEXEC
Huang Ying3ab83522008-07-25 19:45:07 -07001551
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001552config PHYSICAL_START
David Rientjes6a108a12011-01-20 14:44:16 -08001553 hex "Physical address where the kernel is loaded" if (EXPERT || CRASH_DUMP)
H. Peter Anvinceefccc2009-05-11 16:12:16 -07001554 default "0x1000000"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001555 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001556 This gives the physical address where the kernel is loaded.
1557
1558 If kernel is a not relocatable (CONFIG_RELOCATABLE=n) then
1559 bzImage will decompress itself to above physical address and
1560 run from there. Otherwise, bzImage will run from the address where
1561 it has been loaded by the boot loader and will ignore above physical
1562 address.
1563
1564 In normal kdump cases one does not have to set/change this option
1565 as now bzImage can be compiled as a completely relocatable image
1566 (CONFIG_RELOCATABLE=y) and be used to load and run from a different
1567 address. This option is mainly useful for the folks who don't want
1568 to use a bzImage for capturing the crash dump and want to use a
1569 vmlinux instead. vmlinux is not relocatable hence a kernel needs
1570 to be specifically compiled to run from a specific memory area
1571 (normally a reserved region) and this option comes handy.
1572
H. Peter Anvinceefccc2009-05-11 16:12:16 -07001573 So if you are using bzImage for capturing the crash dump,
1574 leave the value here unchanged to 0x1000000 and set
1575 CONFIG_RELOCATABLE=y. Otherwise if you plan to use vmlinux
1576 for capturing the crash dump change this value to start of
1577 the reserved region. In other words, it can be set based on
1578 the "X" value as specified in the "crashkernel=YM@XM"
1579 command line boot parameter passed to the panic-ed
1580 kernel. Please take a look at Documentation/kdump/kdump.txt
1581 for more details about crash dumps.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001582
1583 Usage of bzImage for capturing the crash dump is recommended as
1584 one does not have to build two kernels. Same kernel can be used
1585 as production kernel and capture kernel. Above option should have
1586 gone away after relocatable bzImage support is introduced. But it
1587 is present because there are users out there who continue to use
1588 vmlinux for dump capture. This option should go away down the
1589 line.
1590
1591 Don't change this unless you know what you are doing.
1592
1593config RELOCATABLE
H. Peter Anvin26717802009-05-07 14:19:34 -07001594 bool "Build a relocatable kernel"
1595 default y
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001596 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001597 This builds a kernel image that retains relocation information
1598 so it can be loaded someplace besides the default 1MB.
1599 The relocations tend to make the kernel binary about 10% larger,
1600 but are discarded at runtime.
1601
1602 One use is for the kexec on panic case where the recovery kernel
1603 must live at a different physical address than the primary
1604 kernel.
1605
1606 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
1607 it has been loaded at and the compile time physical address
1608 (CONFIG_PHYSICAL_START) is ignored.
1609
H. Peter Anvin845adf72009-05-05 21:20:51 -07001610# Relocation on x86-32 needs some additional build support
1611config X86_NEED_RELOCS
1612 def_bool y
1613 depends on X86_32 && RELOCATABLE
1614
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001615config PHYSICAL_ALIGN
Jan Beulich6fc108a2010-04-21 15:23:44 +01001616 hex "Alignment value to which kernel should be aligned" if X86_32
H. Peter Anvinceefccc2009-05-11 16:12:16 -07001617 default "0x1000000"
1618 range 0x2000 0x1000000
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001619 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001620 This value puts the alignment restrictions on physical address
1621 where kernel is loaded and run from. Kernel is compiled for an
1622 address which meets above alignment restriction.
1623
1624 If bootloader loads the kernel at a non-aligned address and
1625 CONFIG_RELOCATABLE is set, kernel will move itself to nearest
1626 address aligned to above value and run from there.
1627
1628 If bootloader loads the kernel at a non-aligned address and
1629 CONFIG_RELOCATABLE is not set, kernel will ignore the run time
1630 load address and decompress itself to the address it has been
1631 compiled for and run from there. The address for which kernel is
1632 compiled already meets above alignment restrictions. Hence the
1633 end result is that kernel runs from a physical address meeting
1634 above alignment restrictions.
1635
1636 Don't change this unless you know what you are doing.
1637
1638config HOTPLUG_CPU
Dimitri Sivanich7c13e6a2008-08-11 10:46:46 -05001639 bool "Support for hot-pluggable CPUs"
Ingo Molnar4b19ed912009-01-27 17:47:24 +01001640 depends on SMP && HOTPLUG
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001641 ---help---
Dimitri Sivanich7c13e6a2008-08-11 10:46:46 -05001642 Say Y here to allow turning CPUs off and on. CPUs can be
1643 controlled through /sys/devices/system/cpu.
1644 ( Note: power management support will enable this option
1645 automatically on SMP systems. )
1646 Say N if you want to disable CPU hotplug.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001647
1648config COMPAT_VDSO
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001649 def_bool y
1650 prompt "Compat VDSO support"
Roland McGrathaf65d642008-01-30 13:30:43 +01001651 depends on X86_32 || IA32_EMULATION
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001652 ---help---
Roland McGrathaf65d642008-01-30 13:30:43 +01001653 Map the 32-bit VDSO to the predictable old-style address too.
Randy Dunlape84446d2009-11-10 15:46:52 -08001654
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001655 Say N here if you are running a sufficiently recent glibc
1656 version (2.3.3 or later), to remove the high-mapped
1657 VDSO mapping and to exclusively use the randomized VDSO.
1658
1659 If unsure, say Y.
1660
Tim Bird516cbf32008-08-12 12:52:36 -07001661config CMDLINE_BOOL
1662 bool "Built-in kernel command line"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001663 ---help---
Tim Bird516cbf32008-08-12 12:52:36 -07001664 Allow for specifying boot arguments to the kernel at
1665 build time. On some systems (e.g. embedded ones), it is
1666 necessary or convenient to provide some or all of the
1667 kernel boot arguments with the kernel itself (that is,
1668 to not rely on the boot loader to provide them.)
1669
1670 To compile command line arguments into the kernel,
1671 set this option to 'Y', then fill in the
1672 the boot arguments in CONFIG_CMDLINE.
1673
1674 Systems with fully functional boot loaders (i.e. non-embedded)
1675 should leave this option set to 'N'.
1676
1677config CMDLINE
1678 string "Built-in kernel command string"
1679 depends on CMDLINE_BOOL
1680 default ""
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001681 ---help---
Tim Bird516cbf32008-08-12 12:52:36 -07001682 Enter arguments here that should be compiled into the kernel
1683 image and used at boot time. If the boot loader provides a
1684 command line at boot time, it is appended to this string to
1685 form the full kernel command line, when the system boots.
1686
1687 However, you can use the CONFIG_CMDLINE_OVERRIDE option to
1688 change this behavior.
1689
1690 In most cases, the command line (whether built-in or provided
1691 by the boot loader) should specify the device for the root
1692 file system.
1693
1694config CMDLINE_OVERRIDE
1695 bool "Built-in command line overrides boot loader arguments"
Tim Bird516cbf32008-08-12 12:52:36 -07001696 depends on CMDLINE_BOOL
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001697 ---help---
Tim Bird516cbf32008-08-12 12:52:36 -07001698 Set this option to 'Y' to have the kernel ignore the boot loader
1699 command line, and use ONLY the built-in command line.
1700
1701 This is used to work around broken boot loaders. This should
1702 be set to 'N' under normal conditions.
1703
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001704endmenu
1705
1706config ARCH_ENABLE_MEMORY_HOTPLUG
1707 def_bool y
1708 depends on X86_64 || (X86_32 && HIGHMEM)
1709
Gary Hade35551052008-10-31 10:52:03 -07001710config ARCH_ENABLE_MEMORY_HOTREMOVE
1711 def_bool y
1712 depends on MEMORY_HOTPLUG
1713
Lee Schermerhorne534c7c2010-05-26 14:44:58 -07001714config USE_PERCPU_NUMA_NODE_ID
Tejun Heo645a7912011-01-23 14:37:40 +01001715 def_bool y
Lee Schermerhorne534c7c2010-05-26 14:44:58 -07001716 depends on NUMA
1717
Bjorn Helgaasda85f862008-11-05 13:37:27 -06001718menu "Power management and ACPI options"
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001719
1720config ARCH_HIBERNATION_HEADER
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001721 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001722 depends on X86_64 && HIBERNATION
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001723
1724source "kernel/power/Kconfig"
1725
1726source "drivers/acpi/Kconfig"
1727
Feng Tangefafc8b2009-08-14 15:23:29 -04001728source "drivers/sfi/Kconfig"
1729
Andi Kleena6b68072008-01-30 13:32:49 +01001730config X86_APM_BOOT
Jan Beulich6fc108a2010-04-21 15:23:44 +01001731 def_bool y
Andi Kleena6b68072008-01-30 13:32:49 +01001732 depends on APM || APM_MODULE
1733
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001734menuconfig APM
1735 tristate "APM (Advanced Power Management) BIOS support"
Ingo Molnarefefa6f2008-07-10 16:09:50 +02001736 depends on X86_32 && PM_SLEEP
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001737 ---help---
1738 APM is a BIOS specification for saving power using several different
1739 techniques. This is mostly useful for battery powered laptops with
1740 APM compliant BIOSes. If you say Y here, the system time will be
1741 reset after a RESUME operation, the /proc/apm device will provide
1742 battery status information, and user-space programs will receive
1743 notification of APM "events" (e.g. battery status change).
1744
1745 If you select "Y" here, you can disable actual use of the APM
1746 BIOS by passing the "apm=off" option to the kernel at boot time.
1747
1748 Note that the APM support is almost completely disabled for
1749 machines with more than one CPU.
1750
1751 In order to use APM, you will need supporting software. For location
Randy Dunlap53471122008-03-12 18:10:51 -04001752 and more information, read <file:Documentation/power/pm.txt> and the
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001753 Battery Powered Linux mini-HOWTO, available from
1754 <http://www.tldp.org/docs.html#howto>.
1755
1756 This driver does not spin down disk drives (see the hdparm(8)
1757 manpage ("man 8 hdparm") for that), and it doesn't turn off
1758 VESA-compliant "green" monitors.
1759
1760 This driver does not support the TI 4000M TravelMate and the ACER
1761 486/DX4/75 because they don't have compliant BIOSes. Many "green"
1762 desktop machines also don't have compliant BIOSes, and this driver
1763 may cause those machines to panic during the boot phase.
1764
1765 Generally, if you don't have a battery in your machine, there isn't
1766 much point in using this driver and you should say N. If you get
1767 random kernel OOPSes or reboots that don't seem to be related to
1768 anything, try disabling/enabling this option (or disabling/enabling
1769 APM in your BIOS).
1770
1771 Some other things you should try when experiencing seemingly random,
1772 "weird" problems:
1773
1774 1) make sure that you have enough swap space and that it is
1775 enabled.
1776 2) pass the "no-hlt" option to the kernel
1777 3) switch on floating point emulation in the kernel and pass
1778 the "no387" option to the kernel
1779 4) pass the "floppy=nodma" option to the kernel
1780 5) pass the "mem=4M" option to the kernel (thereby disabling
1781 all but the first 4 MB of RAM)
1782 6) make sure that the CPU is not over clocked.
1783 7) read the sig11 FAQ at <http://www.bitwizard.nl/sig11/>
1784 8) disable the cache from your BIOS settings
1785 9) install a fan for the video card or exchange video RAM
1786 10) install a better fan for the CPU
1787 11) exchange RAM chips
1788 12) exchange the motherboard.
1789
1790 To compile this driver as a module, choose M here: the
1791 module will be called apm.
1792
1793if APM
1794
1795config APM_IGNORE_USER_SUSPEND
1796 bool "Ignore USER SUSPEND"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001797 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001798 This option will ignore USER SUSPEND requests. On machines with a
1799 compliant APM BIOS, you want to say N. However, on the NEC Versa M
1800 series notebooks, it is necessary to say Y because of a BIOS bug.
1801
1802config APM_DO_ENABLE
1803 bool "Enable PM at boot time"
1804 ---help---
1805 Enable APM features at boot time. From page 36 of the APM BIOS
1806 specification: "When disabled, the APM BIOS does not automatically
1807 power manage devices, enter the Standby State, enter the Suspend
1808 State, or take power saving steps in response to CPU Idle calls."
1809 This driver will make CPU Idle calls when Linux is idle (unless this
1810 feature is turned off -- see "Do CPU IDLE calls", below). This
1811 should always save battery power, but more complicated APM features
1812 will be dependent on your BIOS implementation. You may need to turn
1813 this option off if your computer hangs at boot time when using APM
1814 support, or if it beeps continuously instead of suspending. Turn
1815 this off if you have a NEC UltraLite Versa 33/C or a Toshiba
1816 T400CDT. This is off by default since most machines do fine without
1817 this feature.
1818
1819config APM_CPU_IDLE
1820 bool "Make CPU Idle calls when idle"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001821 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001822 Enable calls to APM CPU Idle/CPU Busy inside the kernel's idle loop.
1823 On some machines, this can activate improved power savings, such as
1824 a slowed CPU clock rate, when the machine is idle. These idle calls
1825 are made after the idle loop has run for some length of time (e.g.,
1826 333 mS). On some machines, this will cause a hang at boot time or
1827 whenever the CPU becomes idle. (On machines with more than one CPU,
1828 this option does nothing.)
1829
1830config APM_DISPLAY_BLANK
1831 bool "Enable console blanking using APM"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001832 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001833 Enable console blanking using the APM. Some laptops can use this to
1834 turn off the LCD backlight when the screen blanker of the Linux
1835 virtual console blanks the screen. Note that this is only used by
1836 the virtual console screen blanker, and won't turn off the backlight
1837 when using the X Window system. This also doesn't have anything to
1838 do with your VESA-compliant power-saving monitor. Further, this
1839 option doesn't work for all laptops -- it might not turn off your
1840 backlight at all, or it might print a lot of errors to the console,
1841 especially if you are using gpm.
1842
1843config APM_ALLOW_INTS
1844 bool "Allow interrupts during APM BIOS calls"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001845 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001846 Normally we disable external interrupts while we are making calls to
1847 the APM BIOS as a measure to lessen the effects of a badly behaving
1848 BIOS implementation. The BIOS should reenable interrupts if it
1849 needs to. Unfortunately, some BIOSes do not -- especially those in
1850 many of the newer IBM Thinkpads. If you experience hangs when you
1851 suspend, try setting this to Y. Otherwise, say N.
1852
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001853endif # APM
1854
Dave Jonesbb0a56e2011-05-19 18:51:07 -04001855source "drivers/cpufreq/Kconfig"
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001856
1857source "drivers/cpuidle/Kconfig"
1858
Andy Henroid27471fd2008-10-09 11:45:22 -07001859source "drivers/idle/Kconfig"
1860
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001861endmenu
1862
1863
1864menu "Bus options (PCI etc.)"
1865
1866config PCI
Ingo Molnar1ac97012008-05-19 14:10:14 +02001867 bool "PCI support"
Adrian Bunk1c858082008-01-30 13:32:32 +01001868 default y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001869 select ARCH_SUPPORTS_MSI if (X86_LOCAL_APIC && X86_IO_APIC)
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001870 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001871 Find out whether you have a PCI motherboard. PCI is the name of a
1872 bus system, i.e. the way the CPU talks to the other stuff inside
1873 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
1874 VESA. If you have PCI, say Y, otherwise N.
1875
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001876choice
1877 prompt "PCI access mode"
Ingo Molnarefefa6f2008-07-10 16:09:50 +02001878 depends on X86_32 && PCI
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001879 default PCI_GOANY
1880 ---help---
1881 On PCI systems, the BIOS can be used to detect the PCI devices and
1882 determine their configuration. However, some old PCI motherboards
1883 have BIOS bugs and may crash if this is done. Also, some embedded
1884 PCI-based systems don't have any BIOS at all. Linux can also try to
1885 detect the PCI hardware directly without using the BIOS.
1886
1887 With this option, you can specify how Linux should detect the
1888 PCI devices. If you choose "BIOS", the BIOS will be used,
1889 if you choose "Direct", the BIOS won't be used, and if you
1890 choose "MMConfig", then PCI Express MMCONFIG will be used.
1891 If you choose "Any", the kernel will try MMCONFIG, then the
1892 direct access method and falls back to the BIOS if that doesn't
1893 work. If unsure, go with the default, which is "Any".
1894
1895config PCI_GOBIOS
1896 bool "BIOS"
1897
1898config PCI_GOMMCONFIG
1899 bool "MMConfig"
1900
1901config PCI_GODIRECT
1902 bool "Direct"
1903
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07001904config PCI_GOOLPC
Daniel Drake76fb6572010-09-23 17:28:04 +01001905 bool "OLPC XO-1"
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07001906 depends on OLPC
1907
Andres Salomon2bdd1b02008-06-05 14:14:41 -07001908config PCI_GOANY
1909 bool "Any"
1910
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001911endchoice
1912
1913config PCI_BIOS
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001914 def_bool y
Ingo Molnarefefa6f2008-07-10 16:09:50 +02001915 depends on X86_32 && PCI && (PCI_GOBIOS || PCI_GOANY)
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001916
1917# x86-64 doesn't support PCI BIOS access from long mode so always go direct.
1918config PCI_DIRECT
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001919 def_bool y
Ingo Molnarefefa6f2008-07-10 16:09:50 +02001920 depends on PCI && (X86_64 || (PCI_GODIRECT || PCI_GOANY || PCI_GOOLPC))
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001921
1922config PCI_MMCONFIG
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001923 def_bool y
Feng Tang5f0db7a2009-08-14 15:37:50 -04001924 depends on X86_32 && PCI && (ACPI || SFI) && (PCI_GOMMCONFIG || PCI_GOANY)
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001925
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07001926config PCI_OLPC
Andres Salomon2bdd1b02008-06-05 14:14:41 -07001927 def_bool y
1928 depends on PCI && OLPC && (PCI_GOOLPC || PCI_GOANY)
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07001929
Alex Nixonb5401a92010-03-18 16:31:34 -04001930config PCI_XEN
1931 def_bool y
1932 depends on PCI && XEN
1933 select SWIOTLB_XEN
1934
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001935config PCI_DOMAINS
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001936 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001937 depends on PCI
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001938
1939config PCI_MMCONFIG
1940 bool "Support mmconfig PCI config space access"
1941 depends on X86_64 && PCI && ACPI
1942
Ira W. Snyder3f6ea842010-04-01 11:43:30 -07001943config PCI_CNB20LE_QUIRK
David Rientjes6a108a12011-01-20 14:44:16 -08001944 bool "Read CNB20LE Host Bridge Windows" if EXPERT
Bjorn Helgaas64a5fed2011-01-06 10:12:30 -07001945 default n
1946 depends on PCI && EXPERIMENTAL
Ira W. Snyder3f6ea842010-04-01 11:43:30 -07001947 help
1948 Read the PCI windows out of the CNB20LE host bridge. This allows
1949 PCI hotplug to work on systems with the CNB20LE chipset which do
1950 not have ACPI.
1951
Bjorn Helgaas64a5fed2011-01-06 10:12:30 -07001952 There's no public spec for this chipset, and this functionality
1953 is known to be incomplete.
1954
1955 You should say N unless you know you need this.
1956
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001957config DMAR
1958 bool "Support for DMA Remapping Devices (EXPERIMENTAL)"
David Woodhouse4cf2e752009-02-11 17:23:43 +00001959 depends on PCI_MSI && ACPI && EXPERIMENTAL
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001960 help
1961 DMA remapping (DMAR) devices support enables independent address
1962 translations for Direct Memory Access (DMA) from devices.
1963 These DMA remapping devices are reported via ACPI tables
1964 and include PCI device scope covered by these DMA
1965 remapping devices.
1966
Kyle McMartin0cd5c3c2009-02-04 14:29:19 -08001967config DMAR_DEFAULT_ON
Kyle McMartinf6be37f2009-02-26 12:57:56 -05001968 def_bool y
Kyle McMartin0cd5c3c2009-02-04 14:29:19 -08001969 prompt "Enable DMA Remapping Devices by default"
1970 depends on DMAR
1971 help
1972 Selecting this option will enable a DMAR device at boot time if
1973 one is found. If this option is not selected, DMAR support can
1974 be enabled by passing intel_iommu=on to the kernel. It is
1975 recommended you say N here while the DMAR code remains
1976 experimental.
1977
David Woodhouse62edf5d2009-07-04 10:59:46 +01001978config DMAR_BROKEN_GFX_WA
Jan Beulich6fc108a2010-04-21 15:23:44 +01001979 bool "Workaround broken graphics drivers (going away soon)"
David Woodhouse0c02a202009-09-19 09:37:23 -07001980 depends on DMAR && BROKEN
David Woodhouse62edf5d2009-07-04 10:59:46 +01001981 ---help---
1982 Current Graphics drivers tend to use physical address
1983 for DMA and avoid using DMA APIs. Setting this config
1984 option permits the IOMMU driver to set a unity map for
1985 all the OS-visible memory. Hence the driver can continue
1986 to use physical addresses for DMA, at least until this
1987 option is removed in the 2.6.32 kernel.
1988
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001989config DMAR_FLOPPY_WA
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001990 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001991 depends on DMAR
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001992 ---help---
David Woodhousec7ab48d2009-06-26 19:10:36 +01001993 Floppy disk drivers are known to bypass DMA API calls
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001994 thereby failing to work when IOMMU is enabled. This
1995 workaround will setup a 1:1 mapping for the first
David Woodhousec7ab48d2009-06-26 19:10:36 +01001996 16MiB to make floppy (an ISA device) work.
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001997
Suresh Siddha9fa8c482008-07-10 11:17:00 -07001998config INTR_REMAP
1999 bool "Support for Interrupt Remapping (EXPERIMENTAL)"
2000 depends on X86_64 && X86_IO_APIC && PCI_MSI && ACPI && EXPERIMENTAL
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002001 ---help---
2002 Supports Interrupt remapping for IO-APIC and MSI devices.
2003 To use x2apic mode in the CPU's which support x2APIC enhancements or
2004 to support platforms with CPU's having > 8 bit APIC ID, say Y.
Suresh Siddha9fa8c482008-07-10 11:17:00 -07002005
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002006source "drivers/pci/pcie/Kconfig"
2007
2008source "drivers/pci/Kconfig"
2009
David Rientjes1c00f012011-03-22 16:34:59 -07002010# x86_64 have no ISA slots, but can have ISA-style DMA.
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002011config ISA_DMA_API
David Rientjes1c00f012011-03-22 16:34:59 -07002012 bool "ISA-style DMA support" if (X86_64 && EXPERT)
2013 default y
2014 help
2015 Enables ISA-style DMA support for devices requiring such controllers.
2016 If unsure, say Y.
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002017
2018if X86_32
2019
2020config ISA
2021 bool "ISA support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002022 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002023 Find out whether you have ISA slots on your motherboard. ISA is the
2024 name of a bus system, i.e. the way the CPU talks to the other stuff
2025 inside your box. Other bus systems are PCI, EISA, MicroChannel
2026 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
2027 newer boards don't support it. If you have ISA, say Y, otherwise N.
2028
2029config EISA
2030 bool "EISA support"
2031 depends on ISA
2032 ---help---
2033 The Extended Industry Standard Architecture (EISA) bus was
2034 developed as an open alternative to the IBM MicroChannel bus.
2035
2036 The EISA bus provided some of the features of the IBM MicroChannel
2037 bus while maintaining backward compatibility with cards made for
2038 the older ISA bus. The EISA bus saw limited use between 1988 and
2039 1995 when it was made obsolete by the PCI bus.
2040
2041 Say Y here if you are building a kernel for an EISA-based machine.
2042
2043 Otherwise, say N.
2044
2045source "drivers/eisa/Kconfig"
2046
2047config MCA
Ingo Molnar72ee6eb2009-01-27 16:57:49 +01002048 bool "MCA support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002049 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002050 MicroChannel Architecture is found in some IBM PS/2 machines and
2051 laptops. It is a bus system similar to PCI or ISA. See
2052 <file:Documentation/mca.txt> (and especially the web page given
2053 there) before attempting to build an MCA bus kernel.
2054
2055source "drivers/mca/Kconfig"
2056
2057config SCx200
2058 tristate "NatSemi SCx200 support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002059 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002060 This provides basic support for National Semiconductor's
2061 (now AMD's) Geode processors. The driver probes for the
2062 PCI-IDs of several on-chip devices, so its a good dependency
2063 for other scx200_* drivers.
2064
2065 If compiled as a module, the driver is named scx200.
2066
2067config SCx200HR_TIMER
2068 tristate "NatSemi SCx200 27MHz High-Resolution Timer Support"
John Stultz592913e2010-07-13 17:56:20 -07002069 depends on SCx200
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002070 default y
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002071 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002072 This driver provides a clocksource built upon the on-chip
2073 27MHz high-resolution timer. Its also a workaround for
2074 NSC Geode SC-1100's buggy TSC, which loses time when the
2075 processor goes idle (as is done by the scheduler). The
2076 other workaround is idle=poll boot option.
2077
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07002078config OLPC
2079 bool "One Laptop Per Child support"
Thomas Gleixner54008972011-02-23 09:50:15 +01002080 depends on !X86_PAE
Andres Salomon3c554942009-12-14 18:00:36 -08002081 select GPIOLIB
Thomas Gleixnerdc3119e72011-02-23 10:08:31 +01002082 select OF
Daniel Drake45bb1672011-03-13 15:10:17 +00002083 select OF_PROMTREE
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002084 ---help---
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07002085 Add support for detecting the unique features of the OLPC
2086 XO hardware.
2087
Daniel Drakebf1ebf02010-10-10 10:40:32 +01002088config OLPC_XO1
2089 tristate "OLPC XO-1 support"
Andres Salomon419cdc52010-11-29 15:45:06 -08002090 depends on OLPC && MFD_CS5535
Daniel Drakebf1ebf02010-10-10 10:40:32 +01002091 ---help---
2092 Add support for non-essential features of the OLPC XO-1 laptop.
2093
Sam Ravnborgbc0120f2007-11-06 23:10:39 +01002094endif # X86_32
2095
Andreas Herrmann23ac4ae2010-09-17 18:03:43 +02002096config AMD_NB
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002097 def_bool y
Borislav Petkov0e152cd2010-03-12 15:43:03 +01002098 depends on CPU_SUP_AMD && PCI
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002099
2100source "drivers/pcmcia/Kconfig"
2101
2102source "drivers/pci/hotplug/Kconfig"
2103
Alexandre Bounine388b78a2011-03-23 16:43:03 -07002104config RAPIDIO
2105 bool "RapidIO support"
2106 depends on PCI
2107 default n
2108 help
2109 If you say Y here, the kernel will include drivers and
2110 infrastructure code to support RapidIO interconnect devices.
2111
2112source "drivers/rapidio/Kconfig"
2113
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002114endmenu
2115
2116
2117menu "Executable file formats / Emulations"
2118
2119source "fs/Kconfig.binfmt"
2120
2121config IA32_EMULATION
2122 bool "IA32 Emulation"
2123 depends on X86_64
Roland McGratha97f52e2008-01-30 13:31:55 +01002124 select COMPAT_BINFMT_ELF
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002125 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002126 Include code to run 32-bit programs under a 64-bit kernel. You should
2127 likely turn this on, unless you're 100% sure that you don't have any
2128 32-bit programs left.
2129
2130config IA32_AOUT
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002131 tristate "IA32 a.out support"
2132 depends on IA32_EMULATION
2133 ---help---
2134 Support old a.out binaries in the 32bit emulation.
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002135
2136config COMPAT
Harvey Harrison3c2362e2008-01-30 13:31:03 +01002137 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002138 depends on IA32_EMULATION
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002139
2140config COMPAT_FOR_U64_ALIGNMENT
2141 def_bool COMPAT
2142 depends on X86_64
2143
2144config SYSVIPC_COMPAT
Harvey Harrison3c2362e2008-01-30 13:31:03 +01002145 def_bool y
Alexey Dobriyanb8992192008-09-14 13:44:41 +04002146 depends on COMPAT && SYSVIPC
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002147
David Howellsee009e4a02011-03-07 15:06:20 +00002148config KEYS_COMPAT
2149 bool
2150 depends on COMPAT && KEYS
2151 default y
2152
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002153endmenu
2154
2155
Keith Packarde5beae12008-11-03 18:21:45 +01002156config HAVE_ATOMIC_IOMAP
2157 def_bool y
2158 depends on X86_32
2159
Masami Hiramatsu3cba11d2010-10-14 12:10:42 +09002160config HAVE_TEXT_POKE_SMP
2161 bool
2162 select STOP_MACHINE if SMP
2163
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002164source "net/Kconfig"
2165
2166source "drivers/Kconfig"
2167
2168source "drivers/firmware/Kconfig"
2169
2170source "fs/Kconfig"
2171
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002172source "arch/x86/Kconfig.debug"
2173
2174source "security/Kconfig"
2175
2176source "crypto/Kconfig"
2177
Avi Kivityedf88412007-12-16 11:02:48 +02002178source "arch/x86/kvm/Kconfig"
2179
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002180source "lib/Kconfig"