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Sam Ravnborg1032c0b2007-11-06 21:35:08 +01001# x86 configuration
Sam Ravnborgdaa93fa2007-11-12 20:54:30 +01002mainmenu "Linux Kernel Configuration for x86"
3
4# Select 32 or 64 bit
5config 64BIT
Sam Ravnborg68409992007-11-17 15:37:31 +01006 bool "64-bit kernel" if ARCH = "x86"
7 default ARCH = "x86_64"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01008 ---help---
Sam Ravnborgdaa93fa2007-11-12 20:54:30 +01009 Say yes to build a 64-bit kernel - formerly known as x86_64
10 Say no to build a 32-bit kernel - formerly known as i386
11
12config X86_32
13 def_bool !64BIT
14
15config X86_64
16 def_bool 64BIT
Sam Ravnborg1032c0b2007-11-06 21:35:08 +010017
18### Arch settings
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010019config X86
Harvey Harrison3c2362e2008-01-30 13:31:03 +010020 def_bool y
David Woodhousee17c6d52008-06-17 12:19:34 +010021 select HAVE_AOUT if X86_32
Hitoshi Mitake2c5643b2008-11-30 17:16:04 +090022 select HAVE_READQ
23 select HAVE_WRITEQ
Ingo Molnara5574cf2008-05-05 23:19:50 +020024 select HAVE_UNSTABLE_SCHED_CLOCK
Sam Ravnborgec7748b2008-02-09 10:46:40 +010025 select HAVE_IDE
Mathieu Desnoyers42d4b832008-02-02 15:10:34 -050026 select HAVE_OPROFILE
Ingo Molnarcdd6c482009-09-21 12:02:48 +020027 select HAVE_PERF_EVENTS if (!M386 && !M486)
Rik van Riel28b2ee22008-07-23 21:27:05 -070028 select HAVE_IOREMAP_PROT
Mathieu Desnoyers3f550092008-02-02 15:10:35 -050029 select HAVE_KPROBES
Ingo Molnar1f972762008-07-26 13:52:50 +020030 select ARCH_WANT_OPTIONAL_GPIOLIB
Ingo Molnarda4276b2009-01-07 11:05:10 +010031 select ARCH_WANT_FRAME_POINTERS
FUJITA Tomonori7c095e42009-06-17 16:28:12 -070032 select HAVE_DMA_ATTRS
Ananth N Mavinakayanahalli9edddaa2008-03-04 14:28:37 -080033 select HAVE_KRETPROBES
Steven Rostedte4b2b882008-08-14 15:45:11 -040034 select HAVE_FTRACE_MCOUNT_RECORD
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
Joerg Roedel2118d0c2009-01-09 15:13:15 +010048 select HAVE_DMA_API_DEBUG
H. Peter Anvin2e9f3bd2009-01-04 15:41:25 -080049 select HAVE_KERNEL_GZIP
50 select HAVE_KERNEL_BZIP2
51 select HAVE_KERNEL_LZMA
Albin Tonnerre13510992010-01-08 14:42:45 -080052 select HAVE_KERNEL_LZO
K.Prasad0067f122009-06-01 23:43:57 +053053 select HAVE_HW_BREAKPOINT
Frederic Weisbecker99e8c5a2009-12-17 01:33:54 +010054 select PERF_EVENTS
55 select ANON_INODES
Pekka Enberg0a4af3b2009-02-26 21:38:56 +020056 select HAVE_ARCH_KMEMCHECK
Avi Kivity7c68af62009-09-19 09:40:22 +030057 select HAVE_USER_RETURN_NOTIFIER
Balbir Singh7d8330a2008-02-10 12:46:28 +053058
Linus Torvalds51b26ad2009-04-26 10:12:47 -070059config OUTPUT_FORMAT
60 string
61 default "elf32-i386" if X86_32
62 default "elf64-x86-64" if X86_64
63
Sam Ravnborg73531902008-05-25 23:03:18 +020064config ARCH_DEFCONFIG
Sam Ravnborgb9b39bf2008-04-29 12:48:15 +020065 string
Sam Ravnborg73531902008-05-25 23:03:18 +020066 default "arch/x86/configs/i386_defconfig" if X86_32
67 default "arch/x86/configs/x86_64_defconfig" if X86_64
Sam Ravnborgb9b39bf2008-04-29 12:48:15 +020068
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010069config GENERIC_TIME
Harvey Harrison3c2362e2008-01-30 13:31:03 +010070 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010071
72config GENERIC_CMOS_UPDATE
Harvey Harrison3c2362e2008-01-30 13:31:03 +010073 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010074
75config CLOCKSOURCE_WATCHDOG
Harvey Harrison3c2362e2008-01-30 13:31:03 +010076 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010077
78config GENERIC_CLOCKEVENTS
Harvey Harrison3c2362e2008-01-30 13:31:03 +010079 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010080
81config GENERIC_CLOCKEVENTS_BROADCAST
Harvey Harrison3c2362e2008-01-30 13:31:03 +010082 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010083 depends on X86_64 || (X86_32 && X86_LOCAL_APIC)
84
85config LOCKDEP_SUPPORT
Harvey Harrison3c2362e2008-01-30 13:31:03 +010086 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010087
88config STACKTRACE_SUPPORT
Harvey Harrison3c2362e2008-01-30 13:31:03 +010089 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010090
Heiko Carstensaa7d9352008-02-01 17:45:14 +010091config HAVE_LATENCYTOP_SUPPORT
92 def_bool y
93
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010094config MMU
Harvey Harrison3c2362e2008-01-30 13:31:03 +010095 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010096
97config ZONE_DMA
Harvey Harrison3c2362e2008-01-30 13:31:03 +010098 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010099
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100100config SBUS
101 bool
102
103config GENERIC_ISA_DMA
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100104 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100105
106config GENERIC_IOMAP
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100107 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100108
109config GENERIC_BUG
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100110 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100111 depends on BUG
Jan Beulichb93a5312008-12-16 11:40:27 +0000112 select GENERIC_BUG_RELATIVE_POINTERS if X86_64
113
114config GENERIC_BUG_RELATIVE_POINTERS
115 bool
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100116
117config GENERIC_HWEIGHT
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100118 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100119
Florian Fainellia6082952008-01-30 13:33:35 +0100120config GENERIC_GPIO
Jan Beulich9ba16082008-10-15 22:01:38 -0700121 bool
Florian Fainellia6082952008-01-30 13:33:35 +0100122
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100123config ARCH_MAY_HAVE_PC_FDC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100124 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100125
Sam Ravnborg1032c0b2007-11-06 21:35:08 +0100126config RWSEM_GENERIC_SPINLOCK
127 def_bool !X86_XADD
128
129config RWSEM_XCHGADD_ALGORITHM
130 def_bool X86_XADD
131
Venki Pallipadia6869cc2008-02-08 17:05:44 -0800132config ARCH_HAS_CPU_IDLE_WAIT
133 def_bool y
134
Sam Ravnborg1032c0b2007-11-06 21:35:08 +0100135config GENERIC_CALIBRATE_DELAY
136 def_bool y
137
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100138config GENERIC_TIME_VSYSCALL
139 bool
140 default X86_64
141
venkatesh.pallipadi@intel.com9a0b8412008-01-31 17:35:06 -0800142config ARCH_HAS_CPU_RELAX
143 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100144
Venkatesh Pallipadi89cedfe2008-10-16 19:00:08 -0400145config ARCH_HAS_DEFAULT_IDLE
146 def_bool y
147
Pekka Enberg1b27d052008-04-28 02:12:22 -0700148config ARCH_HAS_CACHE_LINE_SIZE
149 def_bool y
150
Mike Travisdd5af902008-01-30 13:33:32 +0100151config HAVE_SETUP_PER_CPU_AREA
Brian Gerst89c9c4c2009-01-27 12:56:48 +0900152 def_bool y
travis@sgi.comb32ef632008-01-30 13:32:51 +0100153
Tejun Heo08fc4582009-08-14 15:00:49 +0900154config NEED_PER_CPU_EMBED_FIRST_CHUNK
155 def_bool y
156
157config NEED_PER_CPU_PAGE_FIRST_CHUNK
Tejun Heo11124412009-02-20 16:29:09 +0900158 def_bool y
159
Mike Travis9f0e8d02008-04-04 18:11:01 -0700160config HAVE_CPUMASK_OF_CPU_MAP
161 def_bool X86_64_SMP
162
Johannes Berg801e4062007-12-08 02:12:39 +0100163config ARCH_HIBERNATION_POSSIBLE
164 def_bool y
Johannes Berg801e4062007-12-08 02:12:39 +0100165
Johannes Bergf4cb5702007-12-08 02:14:00 +0100166config ARCH_SUSPEND_POSSIBLE
167 def_bool y
Johannes Bergf4cb5702007-12-08 02:14:00 +0100168
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100169config ZONE_DMA32
170 bool
171 default X86_64
172
173config ARCH_POPULATES_NODE_MAP
174 def_bool y
175
176config AUDIT_ARCH
177 bool
178 default X86_64
179
Ingo Molnar765c68b2008-04-09 11:03:37 +0200180config ARCH_SUPPORTS_OPTIMIZED_INLINING
181 def_bool y
182
Akinobu Mita6a11f752009-03-31 15:23:17 -0700183config ARCH_SUPPORTS_DEBUG_PAGEALLOC
184 def_bool y
185
Shane Wang69575d32009-09-01 18:25:07 -0700186config HAVE_INTEL_TXT
187 def_bool y
188 depends on EXPERIMENTAL && DMAR && ACPI
189
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100190# Use the generic interrupt handling code in kernel/irq/:
191config GENERIC_HARDIRQS
192 bool
193 default y
194
Thomas Gleixnerf9a36fa2009-03-13 16:37:48 +0100195config GENERIC_HARDIRQS_NO__DO_IRQ
196 def_bool y
197
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100198config GENERIC_IRQ_PROBE
199 bool
200 default y
201
202config GENERIC_PENDING_IRQ
203 bool
204 depends on GENERIC_HARDIRQS && SMP
205 default y
206
James Bottomley6cd10f82008-11-09 11:53:14 -0600207config USE_GENERIC_SMP_HELPERS
208 def_bool y
209 depends on SMP
210
Sam Ravnborg6b0c3d42008-01-30 13:32:27 +0100211config X86_32_SMP
212 def_bool y
213 depends on X86_32 && SMP
214
215config X86_64_SMP
216 def_bool y
217 depends on X86_64 && SMP
218
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100219config X86_HT
220 bool
Adrian Bunkee0011a2007-12-04 17:19:07 +0100221 depends on SMP
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100222 default y
223
224config X86_TRAMPOLINE
225 bool
Ingo Molnar3e5095d2009-01-27 17:07:08 +0100226 depends on SMP || (64BIT && ACPI_SLEEP)
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100227 default y
228
Tejun Heoccbeed32009-02-09 22:17:40 +0900229config X86_32_LAZY_GS
230 def_bool y
Tejun Heo60a53172009-02-09 22:17:40 +0900231 depends on X86_32 && !CC_STACKPROTECTOR
Tejun Heoccbeed32009-02-09 22:17:40 +0900232
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100233config KTIME_SCALAR
234 def_bool X86_32
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100235source "init/Kconfig"
Matt Helsleydc52ddc2008-10-18 20:27:21 -0700236source "kernel/Kconfig.freezer"
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100237
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100238menu "Processor type and features"
239
240source "kernel/time/Kconfig"
241
242config SMP
243 bool "Symmetric multi-processing support"
244 ---help---
245 This enables support for systems with more than one CPU. If you have
246 a system with only one CPU, like most personal computers, say N. If
247 you have a system with more than one CPU, say Y.
248
249 If you say N here, the kernel will run on single and multiprocessor
250 machines, but will use only one CPU of a multiprocessor machine. If
251 you say Y here, the kernel will run on many, but not all,
252 singleprocessor machines. On a singleprocessor machine, the kernel
253 will run faster if you say N here.
254
255 Note that if you say Y here and choose architecture "586" or
256 "Pentium" under "Processor family", the kernel will not work on 486
257 architectures. Similarly, multiprocessor kernels for the "PPro"
258 architecture may not work on all Pentium based boards.
259
260 People using multiprocessor machines who say Y here should also say
261 Y to "Enhanced Real Time Clock Support", below. The "Advanced Power
262 Management" code will be disabled if you say Y here.
263
Adrian Bunk03502fa2008-02-03 15:50:21 +0200264 See also <file:Documentation/i386/IO-APIC.txt>,
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100265 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
266 <http://www.tldp.org/docs.html#howto>.
267
268 If you don't know what to do here, say N.
269
Yinghai Lu06cd9a72009-02-16 17:29:58 -0800270config X86_X2APIC
271 bool "Support x2apic"
David Woodhousef7d7f862009-04-06 23:04:40 -0700272 depends on X86_LOCAL_APIC && X86_64 && INTR_REMAP
Yinghai Lu06cd9a72009-02-16 17:29:58 -0800273 ---help---
274 This enables x2apic support on CPUs that have this feature.
275
276 This allows 32-bit apic IDs (so it can support very large systems),
277 and accesses the local apic via MSRs not via mmio.
278
Yinghai Lu06cd9a72009-02-16 17:29:58 -0800279 If you don't know what to do here, say N.
280
Yinghai Lu0b8f1ef2008-12-05 18:58:31 -0800281config SPARSE_IRQ
282 bool "Support sparse irq numbering"
Yinghai Lu17483a12008-12-12 13:14:18 -0800283 depends on PCI_MSI || HT_IRQ
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100284 ---help---
Ingo Molnar973656f2008-12-25 16:26:47 +0100285 This enables support for sparse irqs. This is useful for distro
286 kernels that want to define a high CONFIG_NR_CPUS value but still
287 want to have low kernel memory footprint on smaller machines.
Yinghai Lu0b8f1ef2008-12-05 18:58:31 -0800288
Ingo Molnar973656f2008-12-25 16:26:47 +0100289 ( Sparse IRQs can also be beneficial on NUMA boxes, as they spread
290 out the irq_desc[] array in a more NUMA-friendly way. )
291
292 If you don't know what to do here, say N.
Yinghai Lu0b8f1ef2008-12-05 18:58:31 -0800293
Yinghai Lu15e957d2009-04-30 01:17:50 -0700294config NUMA_IRQ_DESC
295 def_bool y
Yinghai Lub9098952008-12-19 13:48:34 -0800296 depends on SPARSE_IRQ && NUMA
Yinghai Lu48a1b102008-12-11 00:15:01 -0800297
Yinghai Lu6695c852008-06-19 12:13:09 -0700298config X86_MPPARSE
Jan Beulich7a527682008-10-30 10:38:24 +0000299 bool "Enable MPS table" if ACPI
300 default y
Ingo Molnar5ab74722008-07-10 14:42:03 +0200301 depends on X86_LOCAL_APIC
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100302 ---help---
Yinghai Lu6695c852008-06-19 12:13:09 -0700303 For old smp systems that do not have proper acpi support. Newer systems
304 (esp with 64bit cpus) with acpi support, MADT and DSDT will override it
Yinghai Lu6695c852008-06-19 12:13:09 -0700305
Yinghai Lu26f7ef12009-01-29 14:19:22 -0800306config X86_BIGSMP
307 bool "Support for big SMP systems with more than 8 CPUs"
308 depends on X86_32 && SMP
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100309 ---help---
Yinghai Lu26f7ef12009-01-29 14:19:22 -0800310 This option is needed for the systems that have more than 8 CPUs
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100311
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800312if X86_32
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800313config X86_EXTENDED_PLATFORM
314 bool "Support for extended (non-PC) x86 platforms"
315 default y
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100316 ---help---
Ingo Molnar06ac8342009-01-27 18:11:43 +0100317 If you disable this option then the kernel will only support
318 standard PC platforms. (which covers the vast majority of
319 systems out there.)
320
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800321 If you enable this option then you'll be able to select support
322 for the following (non-PC) 32 bit x86 platforms:
323 AMD Elan
324 NUMAQ (IBM/Sequent)
325 RDC R-321x SoC
326 SGI 320/540 (Visual Workstation)
327 Summit/EXA (IBM x440)
328 Unisys ES7000 IA32 series
Thomas Gleixner3f4110a2009-08-29 14:54:20 +0200329 Moorestown MID devices
Ingo Molnar06ac8342009-01-27 18:11:43 +0100330
331 If you have one of these systems, or if you want to build a
332 generic distribution kernel, say Y here - otherwise say N.
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800333endif
Ingo Molnar06ac8342009-01-27 18:11:43 +0100334
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800335if X86_64
336config X86_EXTENDED_PLATFORM
337 bool "Support for extended (non-PC) x86 platforms"
338 default y
339 ---help---
340 If you disable this option then the kernel will only support
341 standard PC platforms. (which covers the vast majority of
342 systems out there.)
343
344 If you enable this option then you'll be able to select support
345 for the following (non-PC) 64 bit x86 platforms:
346 ScaleMP vSMP
347 SGI Ultraviolet
348
349 If you have one of these systems, or if you want to build a
350 generic distribution kernel, say Y here - otherwise say N.
351endif
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800352# This is an alphabetically sorted list of 64 bit extended platforms
353# Please maintain the alphabetic order if and when there are additions
Nick Piggin03b48632009-01-20 04:36:04 +0100354
Ingo Molnar6a485652009-01-27 18:29:13 +0100355config X86_VSMP
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800356 bool "ScaleMP vSMP"
Ingo Molnar6a485652009-01-27 18:29:13 +0100357 select PARAVIRT
358 depends on X86_64 && PCI
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800359 depends on X86_EXTENDED_PLATFORM
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100360 ---help---
Ingo Molnar6a485652009-01-27 18:29:13 +0100361 Support for ScaleMP vSMP systems. Say 'Y' here if this kernel is
362 supposed to run on these EM64T-based machines. Only choose this option
363 if you have one of these machines.
364
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800365config X86_UV
366 bool "SGI Ultraviolet"
367 depends on X86_64
368 depends on X86_EXTENDED_PLATFORM
Jack Steiner54c28d22009-04-03 15:39:42 -0500369 depends on NUMA
Suresh Siddha9d6c26e2009-04-20 13:02:31 -0700370 depends on X86_X2APIC
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800371 ---help---
372 This option is needed in order to support SGI Ultraviolet systems.
373 If you don't have one of these, you should say N here.
374
375# Following is an alphabetically sorted list of 32 bit extended platforms
376# Please maintain the alphabetic order if and when there are additions
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100377
378config X86_ELAN
379 bool "AMD Elan"
380 depends on X86_32
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800381 depends on X86_EXTENDED_PLATFORM
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100382 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100383 Select this for an AMD Elan processor.
384
385 Do not use this option for K6/Athlon/Opteron processors!
386
387 If unsure, choose "PC-compatible" instead.
388
Thomas Gleixner3f4110a2009-08-29 14:54:20 +0200389config X86_MRST
390 bool "Moorestown MID platform"
391 depends on X86_32
392 depends on X86_EXTENDED_PLATFORM
393 ---help---
394 Moorestown is Intel's Low Power Intel Architecture (LPIA) based Moblin
395 Internet Device(MID) platform. Moorestown consists of two chips:
396 Lincroft (CPU core, graphics, and memory controller) and Langwell IOH.
397 Unlike standard x86 PCs, Moorestown does not have many legacy devices
398 nor standard legacy replacement devices/features. e.g. Moorestown does
399 not contain i8259, i8254, HPET, legacy BIOS, most of the io ports.
400
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800401config X86_RDC321X
402 bool "RDC R-321x SoC"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100403 depends on X86_32
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800404 depends on X86_EXTENDED_PLATFORM
405 select M486
406 select X86_REBOOTFIXUPS
407 ---help---
408 This option is needed for RDC R-321x system-on-chip, also known
409 as R-8610-(G).
410 If you don't have one of these chips, you should say N here.
411
Ingo Molnare0c7ae32009-01-27 18:43:09 +0100412config X86_32_NON_STANDARD
Ingo Molnar9c398012009-01-27 18:24:57 +0100413 bool "Support non-standard 32-bit SMP architectures"
414 depends on X86_32 && SMP
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800415 depends on X86_EXTENDED_PLATFORM
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100416 ---help---
417 This option compiles in the NUMAQ, Summit, bigsmp, ES7000, default
Yinghai Lud49c4282008-06-08 18:31:54 -0700418 subarchitectures. It is intended for a generic binary kernel.
419 if you select them all, kernel will probe it one by one. and will
420 fallback to default.
421
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800422# Alphabetically sorted list of Non standard 32 bit platforms
Yinghai Lud49c4282008-06-08 18:31:54 -0700423
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100424config X86_NUMAQ
425 bool "NUMAQ (IBM/Sequent)"
Ingo Molnare0c7ae32009-01-27 18:43:09 +0100426 depends on X86_32_NON_STANDARD
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100427 select NUMA
Ingo Molnar9c398012009-01-27 18:24:57 +0100428 select X86_MPPARSE
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100429 ---help---
Yinghai Lud49c4282008-06-08 18:31:54 -0700430 This option is used for getting Linux to run on a NUMAQ (IBM/Sequent)
431 NUMA multiquad box. This changes the way that processors are
432 bootstrapped, and uses Clustered Logical APIC addressing mode instead
433 of Flat Logical. You will need a new lynxer.elf file to flash your
434 firmware with - send email to <Martin.Bligh@us.ibm.com>.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100435
Linus Torvaldsd949f362009-09-26 09:35:07 -0700436config X86_SUPPORTS_MEMORY_FAILURE
437 bool
438 # MCE code calls memory_failure():
439 depends on X86_MCE
440 # On 32-bit this adds too big of NODES_SHIFT and we run out of page flags:
441 depends on !X86_NUMAQ
442 # On 32-bit SPARSEMEM adds too big of SECTIONS_WIDTH:
443 depends on X86_64 || !SPARSEMEM
444 select ARCH_SUPPORTS_MEMORY_FAILURE
445 default y
446
Ingo Molnar1b84e1c2008-07-10 15:55:27 +0200447config X86_VISWS
448 bool "SGI 320/540 (Visual Workstation)"
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800449 depends on X86_32 && PCI && X86_MPPARSE && PCI_GODIRECT
450 depends on X86_32_NON_STANDARD
451 ---help---
Ingo Molnar1b84e1c2008-07-10 15:55:27 +0200452 The SGI Visual Workstation series is an IA32-based workstation
453 based on SGI systems chips with some legacy PC hardware attached.
454
455 Say Y here to create a kernel to run on the SGI 320 or 540.
456
457 A kernel compiled for the Visual Workstation will run on general
458 PCs as well. See <file:Documentation/sgi-visws.txt> for details.
459
Ingo Molnar9c398012009-01-27 18:24:57 +0100460config X86_SUMMIT
461 bool "Summit/EXA (IBM x440)"
Ingo Molnare0c7ae32009-01-27 18:43:09 +0100462 depends on X86_32_NON_STANDARD
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100463 ---help---
Ingo Molnar9c398012009-01-27 18:24:57 +0100464 This option is needed for IBM systems that use the Summit/EXA chipset.
465 In particular, it is needed for the x440.
Ingo Molnar1f972762008-07-26 13:52:50 +0200466
Ingo Molnar9c398012009-01-27 18:24:57 +0100467config X86_ES7000
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800468 bool "Unisys ES7000 IA32 series"
Yinghai Lu26f7ef12009-01-29 14:19:22 -0800469 depends on X86_32_NON_STANDARD && X86_BIGSMP
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100470 ---help---
Ingo Molnar9c398012009-01-27 18:24:57 +0100471 Support for Unisys ES7000 systems. Say 'Y' here if this kernel is
472 supposed to run on an IA32-based Unisys ES7000 system.
473
Ingo Molnarae1e9132008-11-11 09:05:16 +0100474config SCHED_OMIT_FRAME_POINTER
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100475 def_bool y
476 prompt "Single-depth WCHAN output"
Ken Chena87d0912008-11-06 11:10:49 -0800477 depends on X86
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100478 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100479 Calculate simpler /proc/<PID>/wchan values. If this option
480 is disabled then wchan values will recurse back to the
481 caller function. This provides more accurate wchan values,
482 at the expense of slightly more scheduling overhead.
483
484 If in doubt, say "Y".
485
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100486menuconfig PARAVIRT_GUEST
487 bool "Paravirtualized guest support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100488 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100489 Say Y here to get to see options related to running Linux under
490 various hypervisors. This option alone does not add any kernel code.
491
492 If you say N, all options in this submenu will be skipped and disabled.
493
494if PARAVIRT_GUEST
495
496source "arch/x86/xen/Kconfig"
497
498config VMI
Alok Katariad0153ca2009-09-29 10:25:24 -0700499 bool "VMI Guest support (DEPRECATED)"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100500 select PARAVIRT
Eduardo Pereira Habkost42d545c2008-01-30 13:33:32 +0100501 depends on X86_32
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100502 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100503 VMI provides a paravirtualized interface to the VMware ESX server
504 (it could be used by other hypervisors in theory too, but is not
505 at the moment), by linking the kernel to a GPL-ed ROM module
506 provided by the hypervisor.
507
Alok Katariad0153ca2009-09-29 10:25:24 -0700508 As of September 2009, VMware has started a phased retirement
509 of this feature from VMware's products. Please see
510 feature-removal-schedule.txt for details. If you are
511 planning to enable this option, please note that you cannot
512 live migrate a VMI enabled VM to a future VMware product,
513 which doesn't support VMI. So if you expect your kernel to
514 seamlessly migrate to newer VMware products, keep this
515 disabled.
516
Glauber de Oliveira Costa790c73f2008-02-15 17:52:48 -0200517config KVM_CLOCK
518 bool "KVM paravirtualized clock"
519 select PARAVIRT
Gerd Hoffmannf6e16d52008-06-03 16:17:32 +0200520 select PARAVIRT_CLOCK
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100521 ---help---
Glauber de Oliveira Costa790c73f2008-02-15 17:52:48 -0200522 Turning on this option will allow you to run a paravirtualized clock
523 when running over the KVM hypervisor. Instead of relying on a PIT
524 (or probably other) emulation by the underlying device model, the host
525 provides the guest with timing infrastructure such as time of day, and
526 system time
527
Marcelo Tosatti0cf1bfd2008-02-22 12:21:36 -0500528config KVM_GUEST
529 bool "KVM Guest support"
530 select PARAVIRT
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100531 ---help---
532 This option enables various optimizations for running under the KVM
533 hypervisor.
Marcelo Tosatti0cf1bfd2008-02-22 12:21:36 -0500534
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100535source "arch/x86/lguest/Kconfig"
536
Eduardo Pereira Habkoste61bd942008-01-30 13:33:32 +0100537config PARAVIRT
538 bool "Enable paravirtualization code"
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100539 ---help---
Eduardo Pereira Habkoste61bd942008-01-30 13:33:32 +0100540 This changes the kernel so it can modify itself when it is run
541 under a hypervisor, potentially improving performance significantly
542 over full virtualization. However, when run without a hypervisor
543 the kernel is theoretically slower and slightly larger.
544
Jeremy Fitzhardingeb4ecc122009-05-13 17:16:55 -0700545config PARAVIRT_SPINLOCKS
546 bool "Paravirtualization layer for spinlocks"
547 depends on PARAVIRT && SMP && EXPERIMENTAL
548 ---help---
549 Paravirtualized spinlocks allow a pvops backend to replace the
550 spinlock implementation with something virtualization-friendly
551 (for example, block the virtual CPU rather than spinning).
552
553 Unfortunately the downside is an up to 5% performance hit on
554 native kernels, with various workloads.
555
556 If you are unsure how to answer this question, answer N.
557
Gerd Hoffmann7af192c2008-06-03 16:17:29 +0200558config PARAVIRT_CLOCK
559 bool
560 default n
561
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100562endif
563
Jeremy Fitzhardinge97349132008-06-25 00:19:14 -0400564config PARAVIRT_DEBUG
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100565 bool "paravirt-ops debugging"
566 depends on PARAVIRT && DEBUG_KERNEL
567 ---help---
568 Enable to debug paravirt_ops internals. Specifically, BUG if
569 a paravirt_op is missing when it is called.
Jeremy Fitzhardinge97349132008-06-25 00:19:14 -0400570
Yinghai Lu03273182008-04-18 17:49:15 -0700571config MEMTEST
572 bool "Memtest"
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100573 ---help---
Yinghai Luc64df702008-03-21 18:56:19 -0700574 This option adds a kernel parameter 'memtest', which allows memtest
Yinghai Lu03273182008-04-18 17:49:15 -0700575 to be set.
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100576 memtest=0, mean disabled; -- default
577 memtest=1, mean do 1 test pattern;
578 ...
579 memtest=4, mean do 4 test patterns.
Thomas Gleixneraba37282008-07-15 14:48:48 +0200580 If you are unsure how to answer this question, answer N.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100581
582config X86_SUMMIT_NUMA
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100583 def_bool y
Ingo Molnare0c7ae32009-01-27 18:43:09 +0100584 depends on X86_32 && NUMA && X86_32_NON_STANDARD
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100585
586config X86_CYCLONE_TIMER
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100587 def_bool y
Ingo Molnare0c7ae32009-01-27 18:43:09 +0100588 depends on X86_32_NON_STANDARD
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100589
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100590source "arch/x86/Kconfig.cpu"
591
592config HPET_TIMER
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100593 def_bool X86_64
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100594 prompt "HPET Timer Support" if X86_32
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100595 ---help---
596 Use the IA-PC HPET (High Precision Event Timer) to manage
597 time in preference to the PIT and RTC, if a HPET is
598 present.
599 HPET is the next generation timer replacing legacy 8254s.
600 The HPET provides a stable time base on SMP
601 systems, unlike the TSC, but it is more expensive to access,
602 as it is off-chip. You can find the HPET spec at
603 <http://www.intel.com/hardwaredesign/hpetspec_1.pdf>.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100604
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100605 You can safely choose Y here. However, HPET will only be
606 activated if the platform and the BIOS support this feature.
607 Otherwise the 8254 will be used for timing services.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100608
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100609 Choose N to continue using the legacy 8254 timer.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100610
611config HPET_EMULATE_RTC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100612 def_bool y
Bernhard Walle9d8af782008-02-06 01:38:52 -0800613 depends on HPET_TIMER && (RTC=y || RTC=m || RTC_DRV_CMOS=m || RTC_DRV_CMOS=y)
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100614
615# Mark as embedded because too many people got it wrong.
616# The code disables itself when not needed.
Thomas Petazzoni7ae93922008-04-28 02:14:14 -0700617config DMI
618 default y
619 bool "Enable DMI scanning" if EMBEDDED
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100620 ---help---
Thomas Petazzoni7ae93922008-04-28 02:14:14 -0700621 Enabled scanning of DMI to identify machine quirks. Say Y
622 here unless you have verified that your setup is not
623 affected by entries in the DMI blacklist. Required by PNP
624 BIOS code.
625
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100626config GART_IOMMU
627 bool "GART IOMMU support" if EMBEDDED
628 default y
629 select SWIOTLB
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100630 depends on X86_64 && PCI
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100631 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100632 Support for full DMA access of devices with 32bit memory access only
633 on systems with more than 3GB. This is usually needed for USB,
634 sound, many IDE/SATA chipsets and some other devices.
635 Provides a driver for the AMD Athlon64/Opteron/Turion/Sempron GART
636 based hardware IOMMU and a software bounce buffer based IOMMU used
637 on Intel systems and as fallback.
638 The code is only active when needed (enough memory and limited
639 device) unless CONFIG_IOMMU_DEBUG or iommu=force is specified
640 too.
641
642config CALGARY_IOMMU
643 bool "IBM Calgary IOMMU support"
644 select SWIOTLB
645 depends on X86_64 && PCI && EXPERIMENTAL
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100646 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100647 Support for hardware IOMMUs in IBM's xSeries x366 and x460
648 systems. Needed to run systems with more than 3GB of memory
649 properly with 32-bit PCI devices that do not support DAC
650 (Double Address Cycle). Calgary also supports bus level
651 isolation, where all DMAs pass through the IOMMU. This
652 prevents them from going anywhere except their intended
653 destination. This catches hard-to-find kernel bugs and
654 mis-behaving drivers and devices that do not use the DMA-API
655 properly to set up their DMA buffers. The IOMMU can be
656 turned off at boot time with the iommu=off parameter.
657 Normally the kernel will make the right choice by itself.
658 If unsure, say Y.
659
660config CALGARY_IOMMU_ENABLED_BY_DEFAULT
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100661 def_bool y
662 prompt "Should Calgary be enabled by default?"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100663 depends on CALGARY_IOMMU
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100664 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100665 Should Calgary be enabled by default? if you choose 'y', Calgary
666 will be used (if it exists). If you choose 'n', Calgary will not be
667 used even if it exists. If you choose 'n' and would like to use
668 Calgary anyway, pass 'iommu=calgary' on the kernel command line.
669 If unsure, say Y.
670
Joerg Roedel2b188722008-06-26 21:27:37 +0200671config AMD_IOMMU
672 bool "AMD IOMMU support"
Ingo Molnar07c40e82008-06-27 11:31:28 +0200673 select SWIOTLB
Joerg Roedela80dc3e2008-09-11 16:51:41 +0200674 select PCI_MSI
Ingo Molnar24d2ba02008-06-27 10:37:03 +0200675 depends on X86_64 && PCI && ACPI
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100676 ---help---
Joerg Roedel18d22202008-07-03 19:35:06 +0200677 With this option you can enable support for AMD IOMMU hardware in
678 your system. An IOMMU is a hardware component which provides
679 remapping of DMA memory accesses from devices. With an AMD IOMMU you
680 can isolate the the DMA memory of different devices and protect the
681 system from misbehaving device drivers or hardware.
682
683 You can find out if your system has an AMD IOMMU if you look into
684 your BIOS for an option to enable it or if you have an IVRS ACPI
685 table.
Joerg Roedel2b188722008-06-26 21:27:37 +0200686
Joerg Roedel2e117602008-12-11 19:00:12 +0100687config AMD_IOMMU_STATS
688 bool "Export AMD IOMMU statistics to debugfs"
689 depends on AMD_IOMMU
690 select DEBUG_FS
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100691 ---help---
Joerg Roedel2e117602008-12-11 19:00:12 +0100692 This option enables code in the AMD IOMMU driver to collect various
693 statistics about whats happening in the driver and exports that
694 information to userspace via debugfs.
695 If unsure, say N.
696
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100697# need this always selected by IOMMU for the VIA workaround
698config SWIOTLB
Joerg Roedela1afd012008-11-18 12:44:21 +0100699 def_bool y if X86_64
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100700 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100701 Support for software bounce buffers used on x86-64 systems
702 which don't have a hardware IOMMU (e.g. the current generation
703 of Intel's x86-64 CPUs). Using this PCI devices which can only
704 access 32-bits of memory can be used on systems with more than
705 3 GB of memory. If unsure, say Y.
706
FUJITA Tomonoria8522502008-04-29 00:59:36 -0700707config IOMMU_HELPER
FUJITA Tomonori18b743d2008-07-10 09:50:50 +0900708 def_bool (CALGARY_IOMMU || GART_IOMMU || SWIOTLB || AMD_IOMMU)
Linus Torvaldsd25e26b2008-08-25 14:15:38 -0700709
Joerg Roedel1aaf1182008-11-26 17:25:13 +0100710config IOMMU_API
711 def_bool (AMD_IOMMU || DMAR)
712
Mike Travis1184dc22008-05-12 21:21:12 +0200713config MAXSMP
714 bool "Configure Maximum number of SMP Processors and NUMA Nodes"
Mike Travis36f51012008-12-16 17:33:51 -0800715 depends on X86_64 && SMP && DEBUG_KERNEL && EXPERIMENTAL
716 select CPUMASK_OFFSTACK
Mike Travis1184dc22008-05-12 21:21:12 +0200717 default n
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100718 ---help---
Mike Travis1184dc22008-05-12 21:21:12 +0200719 Configure maximum number of CPUS and NUMA Nodes for this architecture.
720 If unsure, say N.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100721
722config NR_CPUS
Mike Travis36f51012008-12-16 17:33:51 -0800723 int "Maximum number of CPUs" if SMP && !MAXSMP
Michael K. Johnson2a3313f2009-04-21 21:44:48 -0400724 range 2 8 if SMP && X86_32 && !X86_BIGSMP
Mike Travis36f51012008-12-16 17:33:51 -0800725 range 2 512 if SMP && !MAXSMP
Mike Travis78637a92008-12-16 17:34:00 -0800726 default "1" if !SMP
Linus Torvaldsd25e26b2008-08-25 14:15:38 -0700727 default "4096" if MAXSMP
Mike Travis78637a92008-12-16 17:34:00 -0800728 default "32" if SMP && (X86_NUMAQ || X86_SUMMIT || X86_BIGSMP || X86_ES7000)
729 default "8" if SMP
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100730 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100731 This allows you to specify the maximum number of CPUs which this
Linus Torvaldsd25e26b2008-08-25 14:15:38 -0700732 kernel will support. The maximum supported value is 512 and the
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100733 minimum value which makes sense is 2.
734
735 This is purely to save memory - each supported CPU adds
736 approximately eight kilobytes to the kernel image.
737
738config SCHED_SMT
739 bool "SMT (Hyperthreading) scheduler support"
Hiroshi Shimamotob089c122008-02-27 13:16:30 -0800740 depends on X86_HT
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100741 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100742 SMT scheduler support improves the CPU scheduler's decision making
743 when dealing with Intel Pentium 4 chips with HyperThreading at a
744 cost of slightly increased overhead in some places. If unsure say
745 N here.
746
747config SCHED_MC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100748 def_bool y
749 prompt "Multi-core scheduler support"
Hiroshi Shimamotob089c122008-02-27 13:16:30 -0800750 depends on X86_HT
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100751 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100752 Multi-core scheduler support improves the CPU scheduler's decision
753 making when dealing with multi-core CPU chips at a cost of slightly
754 increased overhead in some places. If unsure say N here.
755
756source "kernel/Kconfig.preempt"
757
758config X86_UP_APIC
759 bool "Local APIC support on uniprocessors"
Ingo Molnare0c7ae32009-01-27 18:43:09 +0100760 depends on X86_32 && !SMP && !X86_32_NON_STANDARD
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100761 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100762 A local APIC (Advanced Programmable Interrupt Controller) is an
763 integrated interrupt controller in the CPU. If you have a single-CPU
764 system which has a processor with a local APIC, you can say Y here to
765 enable and use it. If you say Y here even though your machine doesn't
766 have a local APIC, then the kernel will still run with no slowdown at
767 all. The local APIC supports CPU-generated self-interrupts (timer,
768 performance counters), and the NMI watchdog which detects hard
769 lockups.
770
771config X86_UP_IOAPIC
772 bool "IO-APIC support on uniprocessors"
773 depends on X86_UP_APIC
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100774 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100775 An IO-APIC (I/O Advanced Programmable Interrupt Controller) is an
776 SMP-capable replacement for PC-style interrupt controllers. Most
777 SMP systems and many recent uniprocessor systems have one.
778
779 If you have a single-CPU system with an IO-APIC, you can say Y here
780 to use it. If you say Y here even though your machine doesn't have
781 an IO-APIC, then the kernel will still run with no slowdown at all.
782
783config X86_LOCAL_APIC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100784 def_bool y
Ingo Molnare0c7ae32009-01-27 18:43:09 +0100785 depends on X86_64 || SMP || X86_32_NON_STANDARD || X86_UP_APIC
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100786
787config X86_IO_APIC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100788 def_bool y
Ingo Molnare0c7ae32009-01-27 18:43:09 +0100789 depends on X86_64 || SMP || X86_32_NON_STANDARD || X86_UP_APIC
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100790
791config X86_VISWS_APIC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100792 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100793 depends on X86_32 && X86_VISWS
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100794
Stefan Assmann41b9eb22008-07-15 13:48:55 +0200795config X86_REROUTE_FOR_BROKEN_BOOT_IRQS
796 bool "Reroute for broken boot IRQs"
797 default n
798 depends on X86_IO_APIC
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100799 ---help---
Stefan Assmann41b9eb22008-07-15 13:48:55 +0200800 This option enables a workaround that fixes a source of
801 spurious interrupts. This is recommended when threaded
802 interrupt handling is used on systems where the generation of
803 superfluous "boot interrupts" cannot be disabled.
804
805 Some chipsets generate a legacy INTx "boot IRQ" when the IRQ
806 entry in the chipset's IO-APIC is masked (as, e.g. the RT
807 kernel does during interrupt handling). On chipsets where this
808 boot IRQ generation cannot be disabled, this workaround keeps
809 the original IRQ line masked so that only the equivalent "boot
810 IRQ" is delivered to the CPUs. The workaround also tells the
811 kernel to set up the IRQ handler on the boot IRQ line. In this
812 way only one interrupt is delivered to the kernel. Otherwise
813 the spurious second interrupt may cause the kernel to bring
814 down (vital) interrupt lines.
815
816 Only affects "broken" chipsets. Interrupt sharing may be
817 increased on these systems.
818
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100819config X86_MCE
Andi Kleenbab9bc62009-07-09 00:31:38 +0200820 bool "Machine Check / overheating reporting"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100821 ---help---
Andi Kleenbab9bc62009-07-09 00:31:38 +0200822 Machine Check support allows the processor to notify the
823 kernel if it detects a problem (e.g. overheating, data corruption).
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100824 The action the kernel takes depends on the severity of the problem,
Andi Kleenbab9bc62009-07-09 00:31:38 +0200825 ranging from warning messages to halting the machine.
Andi Kleen4efc0672009-04-28 19:07:31 +0200826
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100827config X86_MCE_INTEL
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100828 def_bool y
829 prompt "Intel MCE features"
Andi Kleenc1ebf832009-07-09 00:31:41 +0200830 depends on X86_MCE && X86_LOCAL_APIC
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100831 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100832 Additional support for intel specific MCE features such as
833 the thermal monitor.
834
835config X86_MCE_AMD
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100836 def_bool y
837 prompt "AMD MCE features"
Andi Kleenc1ebf832009-07-09 00:31:41 +0200838 depends on X86_MCE && X86_LOCAL_APIC
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100839 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100840 Additional support for AMD specific MCE features such as
841 the DRAM Error Threshold.
842
Andi Kleen4efc0672009-04-28 19:07:31 +0200843config X86_ANCIENT_MCE
Hidetoshi Setocd13adcc2009-05-27 16:57:31 +0900844 def_bool n
Andi Kleenc31d9632009-07-09 00:31:37 +0200845 depends on X86_32 && X86_MCE
Hidetoshi Setocd13adcc2009-05-27 16:57:31 +0900846 prompt "Support for old Pentium 5 / WinChip machine checks"
847 ---help---
848 Include support for machine check handling on old Pentium 5 or WinChip
849 systems. These typically need to be enabled explicitely on the command
850 line.
Andi Kleen4efc0672009-04-28 19:07:31 +0200851
Andi Kleenb2762682009-02-12 13:49:31 +0100852config X86_MCE_THRESHOLD
853 depends on X86_MCE_AMD || X86_MCE_INTEL
854 bool
855 default y
856
Andi Kleenea149b32009-04-29 19:31:00 +0200857config X86_MCE_INJECT
Andi Kleenc1ebf832009-07-09 00:31:41 +0200858 depends on X86_MCE
Andi Kleenea149b32009-04-29 19:31:00 +0200859 tristate "Machine check injector support"
860 ---help---
861 Provide support for injecting machine checks for testing purposes.
862 If you don't know what a machine check is and you don't do kernel
863 QA it is safe to say n.
864
Andi Kleen4efc0672009-04-28 19:07:31 +0200865config X86_THERMAL_VECTOR
866 def_bool y
Andi Kleen5bb38ad2009-07-09 00:31:39 +0200867 depends on X86_MCE_INTEL
Andi Kleen4efc0672009-04-28 19:07:31 +0200868
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100869config VM86
870 bool "Enable VM86 support" if EMBEDDED
871 default y
872 depends on X86_32
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100873 ---help---
874 This option is required by programs like DOSEMU to run 16-bit legacy
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100875 code on X86 processors. It also may be needed by software like
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100876 XFree86 to initialize some video cards via BIOS. Disabling this
877 option saves about 6k.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100878
879config TOSHIBA
880 tristate "Toshiba Laptop support"
881 depends on X86_32
882 ---help---
883 This adds a driver to safely access the System Management Mode of
884 the CPU on Toshiba portables with a genuine Toshiba BIOS. It does
885 not work on models with a Phoenix BIOS. The System Management Mode
886 is used to set the BIOS and power saving options on Toshiba portables.
887
888 For information on utilities to make use of this driver see the
889 Toshiba Linux utilities web site at:
890 <http://www.buzzard.org.uk/toshiba/>.
891
892 Say Y if you intend to run this kernel on a Toshiba portable.
893 Say N otherwise.
894
895config I8K
896 tristate "Dell laptop support"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100897 ---help---
898 This adds a driver to safely access the System Management Mode
899 of the CPU on the Dell Inspiron 8000. The System Management Mode
900 is used to read cpu temperature and cooling fan status and to
901 control the fans on the I8K portables.
902
903 This driver has been tested only on the Inspiron 8000 but it may
904 also work with other Dell laptops. You can force loading on other
905 models by passing the parameter `force=1' to the module. Use at
906 your own risk.
907
908 For information on utilities to make use of this driver see the
909 I8K Linux utilities web site at:
910 <http://people.debian.org/~dz/i8k/>
911
912 Say Y if you intend to run this kernel on a Dell Inspiron 8000.
913 Say N otherwise.
914
915config X86_REBOOTFIXUPS
Jan Beulich9ba16082008-10-15 22:01:38 -0700916 bool "Enable X86 board specific fixups for reboot"
917 depends on X86_32
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100918 ---help---
919 This enables chipset and/or board specific fixups to be done
920 in order to get reboot to work correctly. This is only needed on
921 some combinations of hardware and BIOS. The symptom, for which
922 this config is intended, is when reboot ends with a stalled/hung
923 system.
924
925 Currently, the only fixup is for the Geode machines using
Florian Fainelli5e3a77e2008-01-30 13:33:36 +0100926 CS5530A and CS5536 chipsets and the RDC R-321x SoC.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100927
928 Say Y if you want to enable the fixup. Currently, it's safe to
929 enable this option even if you don't need it.
930 Say N otherwise.
931
932config MICROCODE
Peter Oruba8d86f392008-07-28 18:44:21 +0200933 tristate "/dev/cpu/microcode - microcode support"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100934 select FW_LOADER
935 ---help---
936 If you say Y here, you will be able to update the microcode on
Peter Oruba80cc9f12008-07-28 18:44:22 +0200937 certain Intel and AMD processors. The Intel support is for the
938 IA32 family, e.g. Pentium Pro, Pentium II, Pentium III,
939 Pentium 4, Xeon etc. The AMD support is for family 0x10 and
940 0x11 processors, e.g. Opteron, Phenom and Turion 64 Ultra.
941 You will obviously need the actual microcode binary data itself
942 which is not shipped with the Linux kernel.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100943
Peter Oruba8d86f392008-07-28 18:44:21 +0200944 This option selects the general module only, you need to select
945 at least one vendor specific module as well.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100946
947 To compile this driver as a module, choose M here: the
948 module will be called microcode.
949
Peter Oruba8d86f392008-07-28 18:44:21 +0200950config MICROCODE_INTEL
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100951 bool "Intel microcode patch loading support"
952 depends on MICROCODE
953 default MICROCODE
954 select FW_LOADER
955 ---help---
956 This options enables microcode patch loading support for Intel
957 processors.
Peter Oruba8d86f392008-07-28 18:44:21 +0200958
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100959 For latest news and information on obtaining all the required
960 Intel ingredients for this driver, check:
961 <http://www.urbanmyth.org/microcode/>.
Peter Oruba8d86f392008-07-28 18:44:21 +0200962
Peter Oruba80cc9f12008-07-28 18:44:22 +0200963config MICROCODE_AMD
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100964 bool "AMD microcode patch loading support"
965 depends on MICROCODE
966 select FW_LOADER
967 ---help---
968 If you select this option, microcode patch loading support for AMD
969 processors will be enabled.
Peter Oruba80cc9f12008-07-28 18:44:22 +0200970
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100971config MICROCODE_OLD_INTERFACE
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100972 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100973 depends on MICROCODE
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100974
975config X86_MSR
976 tristate "/dev/cpu/*/msr - Model-specific register support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100977 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100978 This device gives privileged processes access to the x86
979 Model-Specific Registers (MSRs). It is a character device with
980 major 202 and minors 0 to 31 for /dev/cpu/0/msr to /dev/cpu/31/msr.
981 MSR accesses are directed to a specific CPU on multi-processor
982 systems.
983
984config X86_CPUID
985 tristate "/dev/cpu/*/cpuid - CPU information support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100986 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100987 This device gives processes access to the x86 CPUID instruction to
988 be executed on a specific processor. It is a character device
989 with major 203 and minors 0 to 31 for /dev/cpu/0/cpuid to
990 /dev/cpu/31/cpuid.
991
Jaswinder Singh Rajput9b779ed2009-03-10 15:37:51 +0530992config X86_CPU_DEBUG
993 tristate "/sys/kernel/debug/x86/cpu/* - CPU Debug support"
994 ---help---
995 If you select this option, this will provide various x86 CPUs
996 information through debugfs.
997
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100998choice
999 prompt "High Memory Support"
1000 default HIGHMEM4G if !X86_NUMAQ
1001 default HIGHMEM64G if X86_NUMAQ
1002 depends on X86_32
1003
1004config NOHIGHMEM
1005 bool "off"
1006 depends on !X86_NUMAQ
1007 ---help---
1008 Linux can use up to 64 Gigabytes of physical memory on x86 systems.
1009 However, the address space of 32-bit x86 processors is only 4
1010 Gigabytes large. That means that, if you have a large amount of
1011 physical memory, not all of it can be "permanently mapped" by the
1012 kernel. The physical memory that's not permanently mapped is called
1013 "high memory".
1014
1015 If you are compiling a kernel which will never run on a machine with
1016 more than 1 Gigabyte total physical RAM, answer "off" here (default
1017 choice and suitable for most users). This will result in a "3GB/1GB"
1018 split: 3GB are mapped so that each process sees a 3GB virtual memory
1019 space and the remaining part of the 4GB virtual memory space is used
1020 by the kernel to permanently map as much physical memory as
1021 possible.
1022
1023 If the machine has between 1 and 4 Gigabytes physical RAM, then
1024 answer "4GB" here.
1025
1026 If more than 4 Gigabytes is used then answer "64GB" here. This
1027 selection turns Intel PAE (Physical Address Extension) mode on.
1028 PAE implements 3-level paging on IA32 processors. PAE is fully
1029 supported by Linux, PAE mode is implemented on all recent Intel
1030 processors (Pentium Pro and better). NOTE: If you say "64GB" here,
1031 then the kernel will not boot on CPUs that don't support PAE!
1032
1033 The actual amount of total physical memory will either be
1034 auto detected or can be forced by using a kernel command line option
1035 such as "mem=256M". (Try "man bootparam" or see the documentation of
1036 your boot loader (lilo or loadlin) about how to pass options to the
1037 kernel at boot time.)
1038
1039 If unsure, say "off".
1040
1041config HIGHMEM4G
1042 bool "4GB"
1043 depends on !X86_NUMAQ
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001044 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001045 Select this if you have a 32-bit processor and between 1 and 4
1046 gigabytes of physical RAM.
1047
1048config HIGHMEM64G
1049 bool "64GB"
1050 depends on !M386 && !M486
1051 select X86_PAE
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001052 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001053 Select this if you have a 32-bit processor and more than 4
1054 gigabytes of physical RAM.
1055
1056endchoice
1057
1058choice
1059 depends on EXPERIMENTAL
1060 prompt "Memory split" if EMBEDDED
1061 default VMSPLIT_3G
1062 depends on X86_32
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001063 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001064 Select the desired split between kernel and user memory.
1065
1066 If the address range available to the kernel is less than the
1067 physical memory installed, the remaining memory will be available
1068 as "high memory". Accessing high memory is a little more costly
1069 than low memory, as it needs to be mapped into the kernel first.
1070 Note that increasing the kernel address space limits the range
1071 available to user programs, making the address space there
1072 tighter. Selecting anything other than the default 3G/1G split
1073 will also likely make your kernel incompatible with binary-only
1074 kernel modules.
1075
1076 If you are not absolutely sure what you are doing, leave this
1077 option alone!
1078
1079 config VMSPLIT_3G
1080 bool "3G/1G user/kernel split"
1081 config VMSPLIT_3G_OPT
1082 depends on !X86_PAE
1083 bool "3G/1G user/kernel split (for full 1G low memory)"
1084 config VMSPLIT_2G
1085 bool "2G/2G user/kernel split"
1086 config VMSPLIT_2G_OPT
1087 depends on !X86_PAE
1088 bool "2G/2G user/kernel split (for full 2G low memory)"
1089 config VMSPLIT_1G
1090 bool "1G/3G user/kernel split"
1091endchoice
1092
1093config PAGE_OFFSET
1094 hex
1095 default 0xB0000000 if VMSPLIT_3G_OPT
1096 default 0x80000000 if VMSPLIT_2G
1097 default 0x78000000 if VMSPLIT_2G_OPT
1098 default 0x40000000 if VMSPLIT_1G
1099 default 0xC0000000
1100 depends on X86_32
1101
1102config HIGHMEM
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001103 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001104 depends on X86_32 && (HIGHMEM64G || HIGHMEM4G)
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001105
1106config X86_PAE
Jan Beulich9ba16082008-10-15 22:01:38 -07001107 bool "PAE (Physical Address Extension) Support"
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001108 depends on X86_32 && !HIGHMEM4G
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001109 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001110 PAE is required for NX support, and furthermore enables
1111 larger swapspace support for non-overcommit purposes. It
1112 has the cost of more pagetable lookup overhead, and also
1113 consumes more pagetable space per process.
1114
Jeremy Fitzhardinge600715d2008-09-11 01:31:45 -07001115config ARCH_PHYS_ADDR_T_64BIT
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001116 def_bool X86_64 || X86_PAE
Jeremy Fitzhardinge600715d2008-09-11 01:31:45 -07001117
Nick Piggin9e899812008-10-22 12:33:16 +02001118config DIRECT_GBPAGES
1119 bool "Enable 1GB pages for kernel pagetables" if EMBEDDED
1120 default y
1121 depends on X86_64
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001122 ---help---
Nick Piggin9e899812008-10-22 12:33:16 +02001123 Allow the kernel linear mapping to use 1GB pages on CPUs that
1124 support it. This can improve the kernel's performance a tiny bit by
1125 reducing TLB pressure. If in doubt, say "Y".
1126
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001127# Common NUMA Features
1128config NUMA
KOSAKI Motohirofd51b2d2008-11-05 02:27:19 +09001129 bool "Numa Memory Allocation and Scheduler Support"
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001130 depends on SMP
Rafael J. Wysocki604d2052008-11-12 23:26:14 +01001131 depends on X86_64 || (X86_32 && HIGHMEM64G && (X86_NUMAQ || X86_BIGSMP || X86_SUMMIT && ACPI) && EXPERIMENTAL)
Yinghai Lu0699eae2008-06-17 15:39:01 -07001132 default y if (X86_NUMAQ || X86_SUMMIT || X86_BIGSMP)
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001133 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001134 Enable NUMA (Non Uniform Memory Access) support.
KOSAKI Motohirofd51b2d2008-11-05 02:27:19 +09001135
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001136 The kernel will try to allocate memory used by a CPU on the
1137 local memory controller of the CPU and add some more
1138 NUMA awareness to the kernel.
1139
Ingo Molnarc280ea52008-11-08 13:29:45 +01001140 For 64-bit this is recommended if the system is Intel Core i7
KOSAKI Motohirofd51b2d2008-11-05 02:27:19 +09001141 (or later), AMD Opteron, or EM64T NUMA.
1142
1143 For 32-bit this is only needed on (rare) 32-bit-only platforms
1144 that support NUMA topologies, such as NUMAQ / Summit, or if you
1145 boot a 32-bit kernel on a 64-bit NUMA platform.
1146
1147 Otherwise, you should say N.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001148
1149comment "NUMA (Summit) requires SMP, 64GB highmem support, ACPI"
1150 depends on X86_32 && X86_SUMMIT && (!HIGHMEM64G || !ACPI)
1151
1152config K8_NUMA
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001153 def_bool y
1154 prompt "Old style AMD Opteron NUMA detection"
1155 depends on X86_64 && NUMA && PCI
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001156 ---help---
1157 Enable K8 NUMA node topology detection. You should say Y here if
1158 you have a multi processor AMD K8 system. This uses an old
1159 method to read the NUMA configuration directly from the builtin
1160 Northbridge of Opteron. It is recommended to use X86_64_ACPI_NUMA
1161 instead, which also takes priority if both are compiled in.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001162
1163config X86_64_ACPI_NUMA
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001164 def_bool y
1165 prompt "ACPI NUMA detection"
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001166 depends on X86_64 && NUMA && ACPI && PCI
1167 select ACPI_NUMA
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001168 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001169 Enable ACPI SRAT based node topology detection.
1170
Suresh Siddha6ec6e0d2008-03-25 10:14:35 -07001171# Some NUMA nodes have memory ranges that span
1172# other nodes. Even though a pfn is valid and
1173# between a node's start and end pfns, it may not
1174# reside on that node. See memmap_init_zone()
1175# for details.
1176config NODES_SPAN_OTHER_NODES
1177 def_bool y
1178 depends on X86_64_ACPI_NUMA
1179
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001180config NUMA_EMU
1181 bool "NUMA emulation"
1182 depends on X86_64 && NUMA
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001183 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001184 Enable NUMA emulation. A flat machine will be split
1185 into virtual nodes when booted with "numa=fake=N", where N is the
1186 number of nodes. This is only useful for debugging.
1187
1188config NODES_SHIFT
Linus Torvaldsd25e26b2008-08-25 14:15:38 -07001189 int "Maximum NUMA Nodes (as a power of 2)" if !MAXSMP
Jan Beulich46d50c92009-03-12 12:33:06 +00001190 range 1 9
Linus Torvaldsd25e26b2008-08-25 14:15:38 -07001191 default "9" if MAXSMP
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001192 default "6" if X86_64
1193 default "4" if X86_NUMAQ
1194 default "3"
1195 depends on NEED_MULTIPLE_NODES
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001196 ---help---
Mike Travis1184dc22008-05-12 21:21:12 +02001197 Specify the maximum number of NUMA Nodes available on the target
Matt LaPlante692105b2009-01-26 11:12:25 +01001198 system. Increases memory reserved to accommodate various tables.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001199
Tejun Heoc1329372009-02-24 11:57:20 +09001200config HAVE_ARCH_BOOTMEM
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001201 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001202 depends on X86_32 && NUMA
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001203
1204config ARCH_HAVE_MEMORY_PRESENT
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001205 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001206 depends on X86_32 && DISCONTIGMEM
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001207
1208config NEED_NODE_MEMMAP_SIZE
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001209 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001210 depends on X86_32 && (DISCONTIGMEM || SPARSEMEM)
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001211
1212config HAVE_ARCH_ALLOC_REMAP
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001213 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001214 depends on X86_32 && NUMA
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001215
1216config ARCH_FLATMEM_ENABLE
1217 def_bool y
Jeff Chua99809962008-08-06 19:09:53 +08001218 depends on X86_32 && ARCH_SELECT_MEMORY_MODEL && !NUMA
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001219
1220config ARCH_DISCONTIGMEM_ENABLE
1221 def_bool y
Christoph Lameterb2632952008-01-30 13:30:47 +01001222 depends on NUMA && X86_32
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001223
1224config ARCH_DISCONTIGMEM_DEFAULT
1225 def_bool y
Christoph Lameterb2632952008-01-30 13:30:47 +01001226 depends on NUMA && X86_32
1227
KAMEZAWA Hiroyuki94925872009-09-22 16:45:45 -07001228config ARCH_PROC_KCORE_TEXT
1229 def_bool y
1230 depends on X86_64 && PROC_KCORE
1231
Christoph Lameterb2632952008-01-30 13:30:47 +01001232config ARCH_SPARSEMEM_DEFAULT
1233 def_bool y
1234 depends on X86_64
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001235
1236config ARCH_SPARSEMEM_ENABLE
1237 def_bool y
Yinghai Lu4272ebf2009-01-29 15:14:46 -08001238 depends on X86_64 || NUMA || (EXPERIMENTAL && X86_32) || X86_32_NON_STANDARD
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001239 select SPARSEMEM_STATIC if X86_32
1240 select SPARSEMEM_VMEMMAP_ENABLE if X86_64
1241
1242config ARCH_SELECT_MEMORY_MODEL
1243 def_bool y
Christoph Lameterb2632952008-01-30 13:30:47 +01001244 depends on ARCH_SPARSEMEM_ENABLE
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001245
1246config ARCH_MEMORY_PROBE
1247 def_bool X86_64
1248 depends on MEMORY_HOTPLUG
1249
Avi Kivitya29815a2010-01-10 16:28:09 +02001250config ILLEGAL_POINTER_VALUE
1251 hex
1252 default 0 if X86_32
1253 default 0xdead000000000000 if X86_64
1254
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001255source "mm/Kconfig"
1256
1257config HIGHPTE
1258 bool "Allocate 3rd-level pagetables from highmem"
1259 depends on X86_32 && (HIGHMEM4G || HIGHMEM64G)
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001260 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001261 The VM uses one page table entry for each page of physical memory.
1262 For systems with a lot of RAM, this can be wasteful of precious
1263 low memory. Setting this option will put user-space page table
1264 entries in high memory.
1265
Jeremy Fitzhardinge9f077872008-09-07 01:51:34 -07001266config X86_CHECK_BIOS_CORRUPTION
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001267 bool "Check for low memory corruption"
1268 ---help---
1269 Periodically check for memory corruption in low memory, which
1270 is suspected to be caused by BIOS. Even when enabled in the
1271 configuration, it is disabled at runtime. Enable it by
1272 setting "memory_corruption_check=1" on the kernel command
1273 line. By default it scans the low 64k of memory every 60
1274 seconds; see the memory_corruption_check_size and
1275 memory_corruption_check_period parameters in
1276 Documentation/kernel-parameters.txt to adjust this.
Jeremy Fitzhardinge9f077872008-09-07 01:51:34 -07001277
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001278 When enabled with the default parameters, this option has
1279 almost no overhead, as it reserves a relatively small amount
1280 of memory and scans it infrequently. It both detects corruption
1281 and prevents it from affecting the running system.
Jeremy Fitzhardinge9f077872008-09-07 01:51:34 -07001282
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001283 It is, however, intended as a diagnostic tool; if repeatable
1284 BIOS-originated corruption always affects the same memory,
1285 you can use memmap= to prevent the kernel from using that
1286 memory.
Jeremy Fitzhardinge9f077872008-09-07 01:51:34 -07001287
Jeremy Fitzhardingec885df52008-09-07 02:37:32 -07001288config X86_BOOTPARAM_MEMORY_CORRUPTION_CHECK
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001289 bool "Set the default setting of memory_corruption_check"
Jeremy Fitzhardingec885df52008-09-07 02:37:32 -07001290 depends on X86_CHECK_BIOS_CORRUPTION
1291 default y
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001292 ---help---
1293 Set whether the default state of memory_corruption_check is
1294 on or off.
Jeremy Fitzhardingec885df52008-09-07 02:37:32 -07001295
Ingo Molnarfc381512008-09-16 10:07:34 +02001296config X86_RESERVE_LOW_64K
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001297 bool "Reserve low 64K of RAM on AMI/Phoenix BIOSen"
Ingo Molnarfc381512008-09-16 10:07:34 +02001298 default y
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001299 ---help---
1300 Reserve the first 64K of physical RAM on BIOSes that are known
1301 to potentially corrupt that memory range. A numbers of BIOSes are
1302 known to utilize this area during suspend/resume, so it must not
1303 be used by the kernel.
Ingo Molnarfc381512008-09-16 10:07:34 +02001304
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001305 Set this to N if you are absolutely sure that you trust the BIOS
1306 to get all its memory reservations and usages right.
Ingo Molnarfc381512008-09-16 10:07:34 +02001307
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001308 If you have doubts about the BIOS (e.g. suspend/resume does not
1309 work or there's kernel crashes after certain hardware hotplug
1310 events) and it's not AMI or Phoenix, then you might want to enable
1311 X86_CHECK_BIOS_CORRUPTION=y to allow the kernel to check typical
1312 corruption patterns.
Ingo Molnarfc381512008-09-16 10:07:34 +02001313
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001314 Say Y if unsure.
Ingo Molnarfc381512008-09-16 10:07:34 +02001315
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001316config MATH_EMULATION
1317 bool
1318 prompt "Math emulation" if X86_32
1319 ---help---
1320 Linux can emulate a math coprocessor (used for floating point
1321 operations) if you don't have one. 486DX and Pentium processors have
1322 a math coprocessor built in, 486SX and 386 do not, unless you added
1323 a 487DX or 387, respectively. (The messages during boot time can
1324 give you some hints here ["man dmesg"].) Everyone needs either a
1325 coprocessor or this emulation.
1326
1327 If you don't have a math coprocessor, you need to say Y here; if you
1328 say Y here even though you have a coprocessor, the coprocessor will
1329 be used nevertheless. (This behavior can be changed with the kernel
1330 command line option "no387", which comes handy if your coprocessor
1331 is broken. Try "man bootparam" or see the documentation of your boot
1332 loader (lilo or loadlin) about how to pass options to the kernel at
1333 boot time.) This means that it is a good idea to say Y here if you
1334 intend to use this kernel on different machines.
1335
1336 More information about the internals of the Linux math coprocessor
1337 emulation can be found in <file:arch/x86/math-emu/README>.
1338
1339 If you are not sure, say Y; apart from resulting in a 66 KB bigger
1340 kernel, it won't hurt.
1341
1342config MTRR
Arjan van de Venc03cb312009-10-11 10:33:02 -07001343 bool
1344 default y
1345 prompt "MTRR (Memory Type Range Register) support" if EMBEDDED
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001346 ---help---
1347 On Intel P6 family processors (Pentium Pro, Pentium II and later)
1348 the Memory Type Range Registers (MTRRs) may be used to control
1349 processor access to memory ranges. This is most useful if you have
1350 a video (VGA) card on a PCI or AGP bus. Enabling write-combining
1351 allows bus write transfers to be combined into a larger transfer
1352 before bursting over the PCI/AGP bus. This can increase performance
1353 of image write operations 2.5 times or more. Saying Y here creates a
1354 /proc/mtrr file which may be used to manipulate your processor's
1355 MTRRs. Typically the X server should use this.
1356
1357 This code has a reasonably generic interface so that similar
1358 control registers on other processors can be easily supported
1359 as well:
1360
1361 The Cyrix 6x86, 6x86MX and M II processors have Address Range
1362 Registers (ARRs) which provide a similar functionality to MTRRs. For
1363 these, the ARRs are used to emulate the MTRRs.
1364 The AMD K6-2 (stepping 8 and above) and K6-3 processors have two
1365 MTRRs. The Centaur C6 (WinChip) has 8 MCRs, allowing
1366 write-combining. All of these processors are supported by this code
1367 and it makes sense to say Y here if you have one of them.
1368
1369 Saying Y here also fixes a problem with buggy SMP BIOSes which only
1370 set the MTRRs for the boot CPU and not for the secondary CPUs. This
1371 can lead to all sorts of problems, so it's good to say Y here.
1372
1373 You can safely say Y even if your machine doesn't have MTRRs, you'll
1374 just add about 9 KB to your kernel.
1375
Randy Dunlap7225e752008-07-26 17:54:22 -07001376 See <file:Documentation/x86/mtrr.txt> for more information.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001377
Yinghai Lu95ffa242008-04-29 03:52:33 -07001378config MTRR_SANITIZER
Yinghai Lu2ffb3502008-09-30 16:29:40 -07001379 def_bool y
Yinghai Lu95ffa242008-04-29 03:52:33 -07001380 prompt "MTRR cleanup support"
1381 depends on MTRR
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001382 ---help---
Thomas Gleixneraba37282008-07-15 14:48:48 +02001383 Convert MTRR layout from continuous to discrete, so X drivers can
1384 add writeback entries.
Yinghai Lu95ffa242008-04-29 03:52:33 -07001385
Thomas Gleixneraba37282008-07-15 14:48:48 +02001386 Can be disabled with disable_mtrr_cleanup on the kernel command line.
Matt LaPlante692105b2009-01-26 11:12:25 +01001387 The largest mtrr entry size for a continuous block can be set with
Thomas Gleixneraba37282008-07-15 14:48:48 +02001388 mtrr_chunk_size.
Yinghai Lu95ffa242008-04-29 03:52:33 -07001389
Yinghai Lu2ffb3502008-09-30 16:29:40 -07001390 If unsure, say Y.
Yinghai Lu95ffa242008-04-29 03:52:33 -07001391
1392config MTRR_SANITIZER_ENABLE_DEFAULT
Yinghai Luf5098d62008-04-29 20:25:58 -07001393 int "MTRR cleanup enable value (0-1)"
1394 range 0 1
1395 default "0"
Yinghai Lu95ffa242008-04-29 03:52:33 -07001396 depends on MTRR_SANITIZER
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001397 ---help---
Yinghai Luf5098d62008-04-29 20:25:58 -07001398 Enable mtrr cleanup default value
Yinghai Lu95ffa242008-04-29 03:52:33 -07001399
Yinghai Lu12031a62008-05-02 02:40:22 -07001400config MTRR_SANITIZER_SPARE_REG_NR_DEFAULT
1401 int "MTRR cleanup spare reg num (0-7)"
1402 range 0 7
1403 default "1"
1404 depends on MTRR_SANITIZER
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001405 ---help---
Yinghai Lu12031a62008-05-02 02:40:22 -07001406 mtrr cleanup spare entries default, it can be changed via
Thomas Gleixneraba37282008-07-15 14:48:48 +02001407 mtrr_spare_reg_nr=N on the kernel command line.
Yinghai Lu12031a62008-05-02 02:40:22 -07001408
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001409config X86_PAT
Ingo Molnar2a8a2712008-04-26 10:26:52 +02001410 bool
Arjan van de Venc03cb312009-10-11 10:33:02 -07001411 default y
1412 prompt "x86 PAT support" if EMBEDDED
Ingo Molnar2a8a2712008-04-26 10:26:52 +02001413 depends on MTRR
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001414 ---help---
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001415 Use PAT attributes to setup page level cache control.
Venki Pallipadi042b78e2008-03-24 14:22:35 -07001416
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001417 PATs are the modern equivalents of MTRRs and are much more
1418 flexible than MTRRs.
1419
1420 Say N here if you see bootup problems (boot crash, boot hang,
Venki Pallipadi042b78e2008-03-24 14:22:35 -07001421 spontaneous reboots) or a non-working video driver.
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001422
1423 If unsure, say Y.
1424
Venkatesh Pallipadi46cf98c2009-07-10 09:57:37 -07001425config ARCH_USES_PG_UNCACHED
1426 def_bool y
1427 depends on X86_PAT
1428
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001429config EFI
Jan Beulich9ba16082008-10-15 22:01:38 -07001430 bool "EFI runtime service support"
Huang, Ying5b836832008-01-30 13:31:19 +01001431 depends on ACPI
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001432 ---help---
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001433 This enables the kernel to use EFI runtime services that are
1434 available (such as the EFI variable services).
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001435
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001436 This option is only useful on systems that have EFI firmware.
1437 In addition, you should use the latest ELILO loader available
1438 at <http://elilo.sourceforge.net> in order to take advantage
1439 of EFI runtime services. However, even with this option, the
1440 resultant kernel should continue to boot on existing non-EFI
1441 platforms.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001442
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001443config SECCOMP
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001444 def_bool y
1445 prompt "Enable seccomp to safely compute untrusted bytecode"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001446 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001447 This kernel feature is useful for number crunching applications
1448 that may need to compute untrusted bytecode during their
1449 execution. By using pipes or other transports made available to
1450 the process as file descriptors supporting the read/write
1451 syscalls, it's possible to isolate those applications in
1452 their own address space using seccomp. Once seccomp is
Alexey Dobriyan9c0bbee2008-09-09 11:01:31 +04001453 enabled via prctl(PR_SET_SECCOMP), it cannot be disabled
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001454 and the task is only allowed to execute a few safe syscalls
1455 defined by each seccomp mode.
1456
1457 If unsure, say Y. Only embedded should say N here.
1458
1459config CC_STACKPROTECTOR
1460 bool "Enable -fstack-protector buffer overflow detection (EXPERIMENTAL)"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001461 ---help---
1462 This option turns on the -fstack-protector GCC feature. This
Ingo Molnar113c5412008-02-14 10:36:03 +01001463 feature puts, at the beginning of functions, a canary value on
1464 the stack just before the return address, and validates
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001465 the value just before actually returning. Stack based buffer
1466 overflows (that need to overwrite this return address) now also
1467 overwrite the canary, which gets detected and the attack is then
1468 neutralized via a kernel panic.
1469
1470 This feature requires gcc version 4.2 or above, or a distribution
1471 gcc with the feature backported. Older versions are automatically
Ingo Molnar113c5412008-02-14 10:36:03 +01001472 detected and for those versions, this configuration option is
1473 ignored. (and a warning is printed during bootup)
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001474
1475source kernel/Kconfig.hz
1476
1477config KEXEC
1478 bool "kexec system call"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001479 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001480 kexec is a system call that implements the ability to shutdown your
1481 current kernel, and to start another kernel. It is like a reboot
1482 but it is independent of the system firmware. And like a reboot
1483 you can start any kernel with it, not just Linux.
1484
1485 The name comes from the similarity to the exec system call.
1486
1487 It is an ongoing process to be certain the hardware in a machine
1488 is properly shutdown, so do not be surprised if this code does not
1489 initially work for you. It may help to enable device hotplugging
1490 support. As of this writing the exact hardware interface is
1491 strongly in flux, so no good recommendation can be made.
1492
1493config CRASH_DUMP
Pavel Machek04b69442008-08-14 17:16:50 +02001494 bool "kernel crash dumps"
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001495 depends on X86_64 || (X86_32 && HIGHMEM)
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001496 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001497 Generate crash dump after being started by kexec.
1498 This should be normally only set in special crash dump kernels
1499 which are loaded in the main kernel with kexec-tools into
1500 a specially reserved region and then later executed after
1501 a crash by kdump/kexec. The crash dump kernel must be compiled
1502 to a memory address not used by the main kernel or BIOS using
1503 PHYSICAL_START, or it must be built as a relocatable image
1504 (CONFIG_RELOCATABLE=y).
1505 For more details see Documentation/kdump/kdump.txt
1506
Huang Ying3ab83522008-07-25 19:45:07 -07001507config KEXEC_JUMP
1508 bool "kexec jump (EXPERIMENTAL)"
1509 depends on EXPERIMENTAL
Huang Yingfee7b0d2009-03-10 10:57:16 +08001510 depends on KEXEC && HIBERNATION
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001511 ---help---
Huang Ying89081d12008-07-25 19:45:10 -07001512 Jump between original kernel and kexeced kernel and invoke
1513 code in physical address mode via KEXEC
Huang Ying3ab83522008-07-25 19:45:07 -07001514
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001515config PHYSICAL_START
1516 hex "Physical address where the kernel is loaded" if (EMBEDDED || CRASH_DUMP)
H. Peter Anvinceefccc2009-05-11 16:12:16 -07001517 default "0x1000000"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001518 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001519 This gives the physical address where the kernel is loaded.
1520
1521 If kernel is a not relocatable (CONFIG_RELOCATABLE=n) then
1522 bzImage will decompress itself to above physical address and
1523 run from there. Otherwise, bzImage will run from the address where
1524 it has been loaded by the boot loader and will ignore above physical
1525 address.
1526
1527 In normal kdump cases one does not have to set/change this option
1528 as now bzImage can be compiled as a completely relocatable image
1529 (CONFIG_RELOCATABLE=y) and be used to load and run from a different
1530 address. This option is mainly useful for the folks who don't want
1531 to use a bzImage for capturing the crash dump and want to use a
1532 vmlinux instead. vmlinux is not relocatable hence a kernel needs
1533 to be specifically compiled to run from a specific memory area
1534 (normally a reserved region) and this option comes handy.
1535
H. Peter Anvinceefccc2009-05-11 16:12:16 -07001536 So if you are using bzImage for capturing the crash dump,
1537 leave the value here unchanged to 0x1000000 and set
1538 CONFIG_RELOCATABLE=y. Otherwise if you plan to use vmlinux
1539 for capturing the crash dump change this value to start of
1540 the reserved region. In other words, it can be set based on
1541 the "X" value as specified in the "crashkernel=YM@XM"
1542 command line boot parameter passed to the panic-ed
1543 kernel. Please take a look at Documentation/kdump/kdump.txt
1544 for more details about crash dumps.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001545
1546 Usage of bzImage for capturing the crash dump is recommended as
1547 one does not have to build two kernels. Same kernel can be used
1548 as production kernel and capture kernel. Above option should have
1549 gone away after relocatable bzImage support is introduced. But it
1550 is present because there are users out there who continue to use
1551 vmlinux for dump capture. This option should go away down the
1552 line.
1553
1554 Don't change this unless you know what you are doing.
1555
1556config RELOCATABLE
H. Peter Anvin26717802009-05-07 14:19:34 -07001557 bool "Build a relocatable kernel"
1558 default y
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001559 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001560 This builds a kernel image that retains relocation information
1561 so it can be loaded someplace besides the default 1MB.
1562 The relocations tend to make the kernel binary about 10% larger,
1563 but are discarded at runtime.
1564
1565 One use is for the kexec on panic case where the recovery kernel
1566 must live at a different physical address than the primary
1567 kernel.
1568
1569 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
1570 it has been loaded at and the compile time physical address
1571 (CONFIG_PHYSICAL_START) is ignored.
1572
H. Peter Anvin845adf72009-05-05 21:20:51 -07001573# Relocation on x86-32 needs some additional build support
1574config X86_NEED_RELOCS
1575 def_bool y
1576 depends on X86_32 && RELOCATABLE
1577
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001578config PHYSICAL_ALIGN
1579 hex
1580 prompt "Alignment value to which kernel should be aligned" if X86_32
H. Peter Anvinceefccc2009-05-11 16:12:16 -07001581 default "0x1000000"
1582 range 0x2000 0x1000000
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001583 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001584 This value puts the alignment restrictions on physical address
1585 where kernel is loaded and run from. Kernel is compiled for an
1586 address which meets above alignment restriction.
1587
1588 If bootloader loads the kernel at a non-aligned address and
1589 CONFIG_RELOCATABLE is set, kernel will move itself to nearest
1590 address aligned to above value and run from there.
1591
1592 If bootloader loads the kernel at a non-aligned address and
1593 CONFIG_RELOCATABLE is not set, kernel will ignore the run time
1594 load address and decompress itself to the address it has been
1595 compiled for and run from there. The address for which kernel is
1596 compiled already meets above alignment restrictions. Hence the
1597 end result is that kernel runs from a physical address meeting
1598 above alignment restrictions.
1599
1600 Don't change this unless you know what you are doing.
1601
1602config HOTPLUG_CPU
Dimitri Sivanich7c13e6a2008-08-11 10:46:46 -05001603 bool "Support for hot-pluggable CPUs"
Ingo Molnar4b19ed92009-01-27 17:47:24 +01001604 depends on SMP && HOTPLUG
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001605 ---help---
Dimitri Sivanich7c13e6a2008-08-11 10:46:46 -05001606 Say Y here to allow turning CPUs off and on. CPUs can be
1607 controlled through /sys/devices/system/cpu.
1608 ( Note: power management support will enable this option
1609 automatically on SMP systems. )
1610 Say N if you want to disable CPU hotplug.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001611
1612config COMPAT_VDSO
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001613 def_bool y
1614 prompt "Compat VDSO support"
Roland McGrathaf65d642008-01-30 13:30:43 +01001615 depends on X86_32 || IA32_EMULATION
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001616 ---help---
Roland McGrathaf65d642008-01-30 13:30:43 +01001617 Map the 32-bit VDSO to the predictable old-style address too.
Randy Dunlape84446d2009-11-10 15:46:52 -08001618
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001619 Say N here if you are running a sufficiently recent glibc
1620 version (2.3.3 or later), to remove the high-mapped
1621 VDSO mapping and to exclusively use the randomized VDSO.
1622
1623 If unsure, say Y.
1624
Tim Bird516cbf32008-08-12 12:52:36 -07001625config CMDLINE_BOOL
1626 bool "Built-in kernel command line"
1627 default n
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001628 ---help---
Tim Bird516cbf32008-08-12 12:52:36 -07001629 Allow for specifying boot arguments to the kernel at
1630 build time. On some systems (e.g. embedded ones), it is
1631 necessary or convenient to provide some or all of the
1632 kernel boot arguments with the kernel itself (that is,
1633 to not rely on the boot loader to provide them.)
1634
1635 To compile command line arguments into the kernel,
1636 set this option to 'Y', then fill in the
1637 the boot arguments in CONFIG_CMDLINE.
1638
1639 Systems with fully functional boot loaders (i.e. non-embedded)
1640 should leave this option set to 'N'.
1641
1642config CMDLINE
1643 string "Built-in kernel command string"
1644 depends on CMDLINE_BOOL
1645 default ""
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001646 ---help---
Tim Bird516cbf32008-08-12 12:52:36 -07001647 Enter arguments here that should be compiled into the kernel
1648 image and used at boot time. If the boot loader provides a
1649 command line at boot time, it is appended to this string to
1650 form the full kernel command line, when the system boots.
1651
1652 However, you can use the CONFIG_CMDLINE_OVERRIDE option to
1653 change this behavior.
1654
1655 In most cases, the command line (whether built-in or provided
1656 by the boot loader) should specify the device for the root
1657 file system.
1658
1659config CMDLINE_OVERRIDE
1660 bool "Built-in command line overrides boot loader arguments"
1661 default n
1662 depends on CMDLINE_BOOL
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001663 ---help---
Tim Bird516cbf32008-08-12 12:52:36 -07001664 Set this option to 'Y' to have the kernel ignore the boot loader
1665 command line, and use ONLY the built-in command line.
1666
1667 This is used to work around broken boot loaders. This should
1668 be set to 'N' under normal conditions.
1669
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001670endmenu
1671
1672config ARCH_ENABLE_MEMORY_HOTPLUG
1673 def_bool y
1674 depends on X86_64 || (X86_32 && HIGHMEM)
1675
Gary Hade35551052008-10-31 10:52:03 -07001676config ARCH_ENABLE_MEMORY_HOTREMOVE
1677 def_bool y
1678 depends on MEMORY_HOTPLUG
1679
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001680config HAVE_ARCH_EARLY_PFN_TO_NID
1681 def_bool X86_64
1682 depends on NUMA
1683
Bjorn Helgaasda85f862008-11-05 13:37:27 -06001684menu "Power management and ACPI options"
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001685
1686config ARCH_HIBERNATION_HEADER
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001687 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001688 depends on X86_64 && HIBERNATION
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001689
1690source "kernel/power/Kconfig"
1691
1692source "drivers/acpi/Kconfig"
1693
Feng Tangefafc8b2009-08-14 15:23:29 -04001694source "drivers/sfi/Kconfig"
1695
Andi Kleena6b68072008-01-30 13:32:49 +01001696config X86_APM_BOOT
1697 bool
1698 default y
1699 depends on APM || APM_MODULE
1700
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001701menuconfig APM
1702 tristate "APM (Advanced Power Management) BIOS support"
Ingo Molnarefefa6f2008-07-10 16:09:50 +02001703 depends on X86_32 && PM_SLEEP
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001704 ---help---
1705 APM is a BIOS specification for saving power using several different
1706 techniques. This is mostly useful for battery powered laptops with
1707 APM compliant BIOSes. If you say Y here, the system time will be
1708 reset after a RESUME operation, the /proc/apm device will provide
1709 battery status information, and user-space programs will receive
1710 notification of APM "events" (e.g. battery status change).
1711
1712 If you select "Y" here, you can disable actual use of the APM
1713 BIOS by passing the "apm=off" option to the kernel at boot time.
1714
1715 Note that the APM support is almost completely disabled for
1716 machines with more than one CPU.
1717
1718 In order to use APM, you will need supporting software. For location
Randy Dunlap53471122008-03-12 18:10:51 -04001719 and more information, read <file:Documentation/power/pm.txt> and the
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001720 Battery Powered Linux mini-HOWTO, available from
1721 <http://www.tldp.org/docs.html#howto>.
1722
1723 This driver does not spin down disk drives (see the hdparm(8)
1724 manpage ("man 8 hdparm") for that), and it doesn't turn off
1725 VESA-compliant "green" monitors.
1726
1727 This driver does not support the TI 4000M TravelMate and the ACER
1728 486/DX4/75 because they don't have compliant BIOSes. Many "green"
1729 desktop machines also don't have compliant BIOSes, and this driver
1730 may cause those machines to panic during the boot phase.
1731
1732 Generally, if you don't have a battery in your machine, there isn't
1733 much point in using this driver and you should say N. If you get
1734 random kernel OOPSes or reboots that don't seem to be related to
1735 anything, try disabling/enabling this option (or disabling/enabling
1736 APM in your BIOS).
1737
1738 Some other things you should try when experiencing seemingly random,
1739 "weird" problems:
1740
1741 1) make sure that you have enough swap space and that it is
1742 enabled.
1743 2) pass the "no-hlt" option to the kernel
1744 3) switch on floating point emulation in the kernel and pass
1745 the "no387" option to the kernel
1746 4) pass the "floppy=nodma" option to the kernel
1747 5) pass the "mem=4M" option to the kernel (thereby disabling
1748 all but the first 4 MB of RAM)
1749 6) make sure that the CPU is not over clocked.
1750 7) read the sig11 FAQ at <http://www.bitwizard.nl/sig11/>
1751 8) disable the cache from your BIOS settings
1752 9) install a fan for the video card or exchange video RAM
1753 10) install a better fan for the CPU
1754 11) exchange RAM chips
1755 12) exchange the motherboard.
1756
1757 To compile this driver as a module, choose M here: the
1758 module will be called apm.
1759
1760if APM
1761
1762config APM_IGNORE_USER_SUSPEND
1763 bool "Ignore USER SUSPEND"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001764 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001765 This option will ignore USER SUSPEND requests. On machines with a
1766 compliant APM BIOS, you want to say N. However, on the NEC Versa M
1767 series notebooks, it is necessary to say Y because of a BIOS bug.
1768
1769config APM_DO_ENABLE
1770 bool "Enable PM at boot time"
1771 ---help---
1772 Enable APM features at boot time. From page 36 of the APM BIOS
1773 specification: "When disabled, the APM BIOS does not automatically
1774 power manage devices, enter the Standby State, enter the Suspend
1775 State, or take power saving steps in response to CPU Idle calls."
1776 This driver will make CPU Idle calls when Linux is idle (unless this
1777 feature is turned off -- see "Do CPU IDLE calls", below). This
1778 should always save battery power, but more complicated APM features
1779 will be dependent on your BIOS implementation. You may need to turn
1780 this option off if your computer hangs at boot time when using APM
1781 support, or if it beeps continuously instead of suspending. Turn
1782 this off if you have a NEC UltraLite Versa 33/C or a Toshiba
1783 T400CDT. This is off by default since most machines do fine without
1784 this feature.
1785
1786config APM_CPU_IDLE
1787 bool "Make CPU Idle calls when idle"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001788 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001789 Enable calls to APM CPU Idle/CPU Busy inside the kernel's idle loop.
1790 On some machines, this can activate improved power savings, such as
1791 a slowed CPU clock rate, when the machine is idle. These idle calls
1792 are made after the idle loop has run for some length of time (e.g.,
1793 333 mS). On some machines, this will cause a hang at boot time or
1794 whenever the CPU becomes idle. (On machines with more than one CPU,
1795 this option does nothing.)
1796
1797config APM_DISPLAY_BLANK
1798 bool "Enable console blanking using APM"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001799 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001800 Enable console blanking using the APM. Some laptops can use this to
1801 turn off the LCD backlight when the screen blanker of the Linux
1802 virtual console blanks the screen. Note that this is only used by
1803 the virtual console screen blanker, and won't turn off the backlight
1804 when using the X Window system. This also doesn't have anything to
1805 do with your VESA-compliant power-saving monitor. Further, this
1806 option doesn't work for all laptops -- it might not turn off your
1807 backlight at all, or it might print a lot of errors to the console,
1808 especially if you are using gpm.
1809
1810config APM_ALLOW_INTS
1811 bool "Allow interrupts during APM BIOS calls"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001812 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001813 Normally we disable external interrupts while we are making calls to
1814 the APM BIOS as a measure to lessen the effects of a badly behaving
1815 BIOS implementation. The BIOS should reenable interrupts if it
1816 needs to. Unfortunately, some BIOSes do not -- especially those in
1817 many of the newer IBM Thinkpads. If you experience hangs when you
1818 suspend, try setting this to Y. Otherwise, say N.
1819
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001820endif # APM
1821
1822source "arch/x86/kernel/cpu/cpufreq/Kconfig"
1823
1824source "drivers/cpuidle/Kconfig"
1825
Andy Henroid27471fd2008-10-09 11:45:22 -07001826source "drivers/idle/Kconfig"
1827
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001828endmenu
1829
1830
1831menu "Bus options (PCI etc.)"
1832
1833config PCI
Ingo Molnar1ac97012008-05-19 14:10:14 +02001834 bool "PCI support"
Adrian Bunk1c858082008-01-30 13:32:32 +01001835 default y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001836 select ARCH_SUPPORTS_MSI if (X86_LOCAL_APIC && X86_IO_APIC)
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001837 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001838 Find out whether you have a PCI motherboard. PCI is the name of a
1839 bus system, i.e. the way the CPU talks to the other stuff inside
1840 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
1841 VESA. If you have PCI, say Y, otherwise N.
1842
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001843choice
1844 prompt "PCI access mode"
Ingo Molnarefefa6f2008-07-10 16:09:50 +02001845 depends on X86_32 && PCI
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001846 default PCI_GOANY
1847 ---help---
1848 On PCI systems, the BIOS can be used to detect the PCI devices and
1849 determine their configuration. However, some old PCI motherboards
1850 have BIOS bugs and may crash if this is done. Also, some embedded
1851 PCI-based systems don't have any BIOS at all. Linux can also try to
1852 detect the PCI hardware directly without using the BIOS.
1853
1854 With this option, you can specify how Linux should detect the
1855 PCI devices. If you choose "BIOS", the BIOS will be used,
1856 if you choose "Direct", the BIOS won't be used, and if you
1857 choose "MMConfig", then PCI Express MMCONFIG will be used.
1858 If you choose "Any", the kernel will try MMCONFIG, then the
1859 direct access method and falls back to the BIOS if that doesn't
1860 work. If unsure, go with the default, which is "Any".
1861
1862config PCI_GOBIOS
1863 bool "BIOS"
1864
1865config PCI_GOMMCONFIG
1866 bool "MMConfig"
1867
1868config PCI_GODIRECT
1869 bool "Direct"
1870
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07001871config PCI_GOOLPC
1872 bool "OLPC"
1873 depends on OLPC
1874
Andres Salomon2bdd1b02008-06-05 14:14:41 -07001875config PCI_GOANY
1876 bool "Any"
1877
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001878endchoice
1879
1880config PCI_BIOS
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001881 def_bool y
Ingo Molnarefefa6f2008-07-10 16:09:50 +02001882 depends on X86_32 && PCI && (PCI_GOBIOS || PCI_GOANY)
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001883
1884# x86-64 doesn't support PCI BIOS access from long mode so always go direct.
1885config PCI_DIRECT
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001886 def_bool y
Ingo Molnarefefa6f2008-07-10 16:09:50 +02001887 depends on PCI && (X86_64 || (PCI_GODIRECT || PCI_GOANY || PCI_GOOLPC))
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001888
1889config PCI_MMCONFIG
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001890 def_bool y
Feng Tang5f0db7a2009-08-14 15:37:50 -04001891 depends on X86_32 && PCI && (ACPI || SFI) && (PCI_GOMMCONFIG || PCI_GOANY)
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001892
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07001893config PCI_OLPC
Andres Salomon2bdd1b02008-06-05 14:14:41 -07001894 def_bool y
1895 depends on PCI && OLPC && (PCI_GOOLPC || PCI_GOANY)
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07001896
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001897config PCI_DOMAINS
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001898 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001899 depends on PCI
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001900
1901config PCI_MMCONFIG
1902 bool "Support mmconfig PCI config space access"
1903 depends on X86_64 && PCI && ACPI
1904
1905config DMAR
1906 bool "Support for DMA Remapping Devices (EXPERIMENTAL)"
David Woodhouse4cf2e752009-02-11 17:23:43 +00001907 depends on PCI_MSI && ACPI && EXPERIMENTAL
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001908 help
1909 DMA remapping (DMAR) devices support enables independent address
1910 translations for Direct Memory Access (DMA) from devices.
1911 These DMA remapping devices are reported via ACPI tables
1912 and include PCI device scope covered by these DMA
1913 remapping devices.
1914
Kyle McMartin0cd5c3c2009-02-04 14:29:19 -08001915config DMAR_DEFAULT_ON
Kyle McMartinf6be37f2009-02-26 12:57:56 -05001916 def_bool y
Kyle McMartin0cd5c3c2009-02-04 14:29:19 -08001917 prompt "Enable DMA Remapping Devices by default"
1918 depends on DMAR
1919 help
1920 Selecting this option will enable a DMAR device at boot time if
1921 one is found. If this option is not selected, DMAR support can
1922 be enabled by passing intel_iommu=on to the kernel. It is
1923 recommended you say N here while the DMAR code remains
1924 experimental.
1925
David Woodhouse62edf5d2009-07-04 10:59:46 +01001926config DMAR_BROKEN_GFX_WA
1927 def_bool n
1928 prompt "Workaround broken graphics drivers (going away soon)"
David Woodhouse0c02a202009-09-19 09:37:23 -07001929 depends on DMAR && BROKEN
David Woodhouse62edf5d2009-07-04 10:59:46 +01001930 ---help---
1931 Current Graphics drivers tend to use physical address
1932 for DMA and avoid using DMA APIs. Setting this config
1933 option permits the IOMMU driver to set a unity map for
1934 all the OS-visible memory. Hence the driver can continue
1935 to use physical addresses for DMA, at least until this
1936 option is removed in the 2.6.32 kernel.
1937
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001938config DMAR_FLOPPY_WA
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001939 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001940 depends on DMAR
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001941 ---help---
David Woodhousec7ab48d2009-06-26 19:10:36 +01001942 Floppy disk drivers are known to bypass DMA API calls
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001943 thereby failing to work when IOMMU is enabled. This
1944 workaround will setup a 1:1 mapping for the first
David Woodhousec7ab48d2009-06-26 19:10:36 +01001945 16MiB to make floppy (an ISA device) work.
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001946
Suresh Siddha9fa8c482008-07-10 11:17:00 -07001947config INTR_REMAP
1948 bool "Support for Interrupt Remapping (EXPERIMENTAL)"
1949 depends on X86_64 && X86_IO_APIC && PCI_MSI && ACPI && EXPERIMENTAL
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001950 ---help---
1951 Supports Interrupt remapping for IO-APIC and MSI devices.
1952 To use x2apic mode in the CPU's which support x2APIC enhancements or
1953 to support platforms with CPU's having > 8 bit APIC ID, say Y.
Suresh Siddha9fa8c482008-07-10 11:17:00 -07001954
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001955source "drivers/pci/pcie/Kconfig"
1956
1957source "drivers/pci/Kconfig"
1958
1959# x86_64 have no ISA slots, but do have ISA-style DMA.
1960config ISA_DMA_API
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001961 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001962
1963if X86_32
1964
1965config ISA
1966 bool "ISA support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001967 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001968 Find out whether you have ISA slots on your motherboard. ISA is the
1969 name of a bus system, i.e. the way the CPU talks to the other stuff
1970 inside your box. Other bus systems are PCI, EISA, MicroChannel
1971 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
1972 newer boards don't support it. If you have ISA, say Y, otherwise N.
1973
1974config EISA
1975 bool "EISA support"
1976 depends on ISA
1977 ---help---
1978 The Extended Industry Standard Architecture (EISA) bus was
1979 developed as an open alternative to the IBM MicroChannel bus.
1980
1981 The EISA bus provided some of the features of the IBM MicroChannel
1982 bus while maintaining backward compatibility with cards made for
1983 the older ISA bus. The EISA bus saw limited use between 1988 and
1984 1995 when it was made obsolete by the PCI bus.
1985
1986 Say Y here if you are building a kernel for an EISA-based machine.
1987
1988 Otherwise, say N.
1989
1990source "drivers/eisa/Kconfig"
1991
1992config MCA
Ingo Molnar72ee6eb2009-01-27 16:57:49 +01001993 bool "MCA support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001994 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001995 MicroChannel Architecture is found in some IBM PS/2 machines and
1996 laptops. It is a bus system similar to PCI or ISA. See
1997 <file:Documentation/mca.txt> (and especially the web page given
1998 there) before attempting to build an MCA bus kernel.
1999
2000source "drivers/mca/Kconfig"
2001
2002config SCx200
2003 tristate "NatSemi SCx200 support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002004 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002005 This provides basic support for National Semiconductor's
2006 (now AMD's) Geode processors. The driver probes for the
2007 PCI-IDs of several on-chip devices, so its a good dependency
2008 for other scx200_* drivers.
2009
2010 If compiled as a module, the driver is named scx200.
2011
2012config SCx200HR_TIMER
2013 tristate "NatSemi SCx200 27MHz High-Resolution Timer Support"
2014 depends on SCx200 && GENERIC_TIME
2015 default y
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002016 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002017 This driver provides a clocksource built upon the on-chip
2018 27MHz high-resolution timer. Its also a workaround for
2019 NSC Geode SC-1100's buggy TSC, which loses time when the
2020 processor goes idle (as is done by the scheduler). The
2021 other workaround is idle=poll boot option.
2022
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07002023config OLPC
2024 bool "One Laptop Per Child support"
Andres Salomon3c554942009-12-14 18:00:36 -08002025 select GPIOLIB
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07002026 default n
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002027 ---help---
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07002028 Add support for detecting the unique features of the OLPC
2029 XO hardware.
2030
Sam Ravnborgbc0120f2007-11-06 23:10:39 +01002031endif # X86_32
2032
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002033config K8_NB
2034 def_bool y
Sam Ravnborgbc0120f2007-11-06 23:10:39 +01002035 depends on AGP_AMD64 || (X86_64 && (GART_IOMMU || (PCI && NUMA)))
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002036
2037source "drivers/pcmcia/Kconfig"
2038
2039source "drivers/pci/hotplug/Kconfig"
2040
2041endmenu
2042
2043
2044menu "Executable file formats / Emulations"
2045
2046source "fs/Kconfig.binfmt"
2047
2048config IA32_EMULATION
2049 bool "IA32 Emulation"
2050 depends on X86_64
Roland McGratha97f52e2008-01-30 13:31:55 +01002051 select COMPAT_BINFMT_ELF
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002052 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002053 Include code to run 32-bit programs under a 64-bit kernel. You should
2054 likely turn this on, unless you're 100% sure that you don't have any
2055 32-bit programs left.
2056
2057config IA32_AOUT
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002058 tristate "IA32 a.out support"
2059 depends on IA32_EMULATION
2060 ---help---
2061 Support old a.out binaries in the 32bit emulation.
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002062
2063config COMPAT
Harvey Harrison3c2362e2008-01-30 13:31:03 +01002064 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002065 depends on IA32_EMULATION
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002066
2067config COMPAT_FOR_U64_ALIGNMENT
2068 def_bool COMPAT
2069 depends on X86_64
2070
2071config SYSVIPC_COMPAT
Harvey Harrison3c2362e2008-01-30 13:31:03 +01002072 def_bool y
Alexey Dobriyanb8992192008-09-14 13:44:41 +04002073 depends on COMPAT && SYSVIPC
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002074
2075endmenu
2076
2077
Keith Packarde5beae12008-11-03 18:21:45 +01002078config HAVE_ATOMIC_IOMAP
2079 def_bool y
2080 depends on X86_32
2081
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002082source "net/Kconfig"
2083
2084source "drivers/Kconfig"
2085
2086source "drivers/firmware/Kconfig"
2087
2088source "fs/Kconfig"
2089
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002090source "arch/x86/Kconfig.debug"
2091
2092source "security/Kconfig"
2093
2094source "crypto/Kconfig"
2095
Avi Kivityedf88412007-12-16 11:02:48 +02002096source "arch/x86/kvm/Kconfig"
2097
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002098source "lib/Kconfig"