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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
Masami Hiramatsuc0f7ac32010-02-25 08:34:46 -050034 select HAVE_OPTPROBES
Steven Rostedte4b2b882008-08-14 15:45:11 -040035 select HAVE_FTRACE_MCOUNT_RECORD
Steven Rostedt677aa9f2008-05-17 00:01:36 -040036 select HAVE_DYNAMIC_FTRACE
Steven Rostedt606576c2008-10-06 19:06:12 -040037 select HAVE_FUNCTION_TRACER
Frederic Weisbecker48d68b22008-12-02 00:20:39 +010038 select HAVE_FUNCTION_GRAPH_TRACER
Steven Rostedt71e308a2009-06-18 12:45:08 -040039 select HAVE_FUNCTION_GRAPH_FP_TEST
Steven Rostedt60a7ecf2008-11-05 16:05:44 -050040 select HAVE_FUNCTION_TRACE_MCOUNT_TEST
Steven Rostedt9a5fd902009-02-06 01:14:26 -050041 select HAVE_FTRACE_NMI_ENTER if DYNAMIC_FTRACE
Josh Stone66700002009-08-24 14:43:11 -070042 select HAVE_SYSCALL_TRACEPOINTS
Ingo Molnare0ec9482009-01-27 17:01:14 +010043 select HAVE_KVM
Ingo Molnar49793b02009-01-27 17:02:29 +010044 select HAVE_ARCH_KGDB
Roland McGrath99bbc4b2008-04-20 14:35:12 -070045 select HAVE_ARCH_TRACEHOOK
Dmitry Baryshkov323ec002008-06-29 14:19:31 +040046 select HAVE_GENERIC_DMA_COHERENT if X86_32
Johannes Berg58340a02008-07-25 01:45:33 -070047 select HAVE_EFFICIENT_UNALIGNED_ACCESS
Török Edwin8d264872008-11-23 12:39:08 +020048 select USER_STACKTRACE_SUPPORT
Heiko Carstensf850c30c2010-02-10 17:25:17 +010049 select HAVE_REGS_AND_STACK_ACCESS_API
Joerg Roedel2118d0c2009-01-09 15:13:15 +010050 select HAVE_DMA_API_DEBUG
H. Peter Anvin2e9f3bd2009-01-04 15:41:25 -080051 select HAVE_KERNEL_GZIP
52 select HAVE_KERNEL_BZIP2
53 select HAVE_KERNEL_LZMA
Albin Tonnerre13510992010-01-08 14:42:45 -080054 select HAVE_KERNEL_LZO
K.Prasad0067f122009-06-01 23:43:57 +053055 select HAVE_HW_BREAKPOINT
Frederic Weisbecker01027522010-04-11 18:55:56 +020056 select HAVE_MIXED_BREAKPOINTS_REGS
Frederic Weisbecker99e8c5a2009-12-17 01:33:54 +010057 select PERF_EVENTS
58 select ANON_INODES
Pekka Enberg0a4af3b2009-02-26 21:38:56 +020059 select HAVE_ARCH_KMEMCHECK
Avi Kivity7c68af62009-09-19 09:40:22 +030060 select HAVE_USER_RETURN_NOTIFIER
Balbir Singh7d8330a2008-02-10 12:46:28 +053061
Ingo Molnarba7e4d12009-06-06 13:58:12 +020062config INSTRUCTION_DECODER
63 def_bool (KPROBES || PERF_EVENTS)
64
Linus Torvalds51b26ad2009-04-26 10:12:47 -070065config OUTPUT_FORMAT
66 string
67 default "elf32-i386" if X86_32
68 default "elf64-x86-64" if X86_64
69
Sam Ravnborg73531902008-05-25 23:03:18 +020070config ARCH_DEFCONFIG
Sam Ravnborgb9b39bf2008-04-29 12:48:15 +020071 string
Sam Ravnborg73531902008-05-25 23:03:18 +020072 default "arch/x86/configs/i386_defconfig" if X86_32
73 default "arch/x86/configs/x86_64_defconfig" if X86_64
Sam Ravnborgb9b39bf2008-04-29 12:48:15 +020074
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010075config GENERIC_TIME
Harvey Harrison3c2362e2008-01-30 13:31:03 +010076 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010077
78config GENERIC_CMOS_UPDATE
Harvey Harrison3c2362e2008-01-30 13:31:03 +010079 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010080
81config CLOCKSOURCE_WATCHDOG
Harvey Harrison3c2362e2008-01-30 13:31:03 +010082 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010083
84config GENERIC_CLOCKEVENTS
Harvey Harrison3c2362e2008-01-30 13:31:03 +010085 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010086
87config GENERIC_CLOCKEVENTS_BROADCAST
Harvey Harrison3c2362e2008-01-30 13:31:03 +010088 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010089 depends on X86_64 || (X86_32 && X86_LOCAL_APIC)
90
91config LOCKDEP_SUPPORT
Harvey Harrison3c2362e2008-01-30 13:31:03 +010092 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010093
94config STACKTRACE_SUPPORT
Harvey Harrison3c2362e2008-01-30 13:31:03 +010095 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010096
Heiko Carstensaa7d9352008-02-01 17:45:14 +010097config HAVE_LATENCYTOP_SUPPORT
98 def_bool y
99
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100100config MMU
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100101 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100102
103config ZONE_DMA
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100104 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100105
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100106config SBUS
107 bool
108
FUJITA Tomonori3bc4e452010-03-10 15:23:22 -0800109config NEED_DMA_MAP_STATE
110 def_bool (X86_64 || DMAR || DMA_API_DEBUG)
111
FUJITA Tomonori18e98302010-05-26 14:44:32 -0700112config NEED_SG_DMA_LENGTH
Andrew Morton4a14d842010-05-26 14:44:33 -0700113 def_bool y
FUJITA Tomonori18e98302010-05-26 14:44:32 -0700114
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100115config GENERIC_ISA_DMA
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100116 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100117
118config GENERIC_IOMAP
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100119 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100120
121config GENERIC_BUG
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100122 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100123 depends on BUG
Jan Beulichb93a5312008-12-16 11:40:27 +0000124 select GENERIC_BUG_RELATIVE_POINTERS if X86_64
125
126config GENERIC_BUG_RELATIVE_POINTERS
127 bool
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100128
129config GENERIC_HWEIGHT
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100130 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100131
Florian Fainellia6082952008-01-30 13:33:35 +0100132config GENERIC_GPIO
Jan Beulich9ba16082008-10-15 22:01:38 -0700133 bool
Florian Fainellia6082952008-01-30 13:33:35 +0100134
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100135config ARCH_MAY_HAVE_PC_FDC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100136 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100137
Sam Ravnborg1032c0b2007-11-06 21:35:08 +0100138config RWSEM_GENERIC_SPINLOCK
139 def_bool !X86_XADD
140
141config RWSEM_XCHGADD_ALGORITHM
142 def_bool X86_XADD
143
Venki Pallipadia6869cc2008-02-08 17:05:44 -0800144config ARCH_HAS_CPU_IDLE_WAIT
145 def_bool y
146
Sam Ravnborg1032c0b2007-11-06 21:35:08 +0100147config GENERIC_CALIBRATE_DELAY
148 def_bool y
149
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100150config GENERIC_TIME_VSYSCALL
151 bool
152 default X86_64
153
venkatesh.pallipadi@intel.com9a0b8412008-01-31 17:35:06 -0800154config ARCH_HAS_CPU_RELAX
155 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100156
Venkatesh Pallipadi89cedfe2008-10-16 19:00:08 -0400157config ARCH_HAS_DEFAULT_IDLE
158 def_bool y
159
Pekka Enberg1b27d052008-04-28 02:12:22 -0700160config ARCH_HAS_CACHE_LINE_SIZE
161 def_bool y
162
Mike Travisdd5af902008-01-30 13:33:32 +0100163config HAVE_SETUP_PER_CPU_AREA
Brian Gerst89c9c4c2009-01-27 12:56:48 +0900164 def_bool y
travis@sgi.comb32ef632008-01-30 13:32:51 +0100165
Tejun Heo08fc4582009-08-14 15:00:49 +0900166config NEED_PER_CPU_EMBED_FIRST_CHUNK
167 def_bool y
168
169config NEED_PER_CPU_PAGE_FIRST_CHUNK
Tejun Heo11124412009-02-20 16:29:09 +0900170 def_bool y
171
Mike Travis9f0e8d02008-04-04 18:11:01 -0700172config HAVE_CPUMASK_OF_CPU_MAP
173 def_bool X86_64_SMP
174
Johannes Berg801e4062007-12-08 02:12:39 +0100175config ARCH_HIBERNATION_POSSIBLE
176 def_bool y
Johannes Berg801e4062007-12-08 02:12:39 +0100177
Johannes Bergf4cb5702007-12-08 02:14:00 +0100178config ARCH_SUSPEND_POSSIBLE
179 def_bool y
Johannes Bergf4cb5702007-12-08 02:14:00 +0100180
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100181config ZONE_DMA32
182 bool
183 default X86_64
184
185config ARCH_POPULATES_NODE_MAP
186 def_bool y
187
188config AUDIT_ARCH
189 bool
190 default X86_64
191
Ingo Molnar765c68b2008-04-09 11:03:37 +0200192config ARCH_SUPPORTS_OPTIMIZED_INLINING
193 def_bool y
194
Akinobu Mita6a11f752009-03-31 15:23:17 -0700195config ARCH_SUPPORTS_DEBUG_PAGEALLOC
196 def_bool y
197
Yinghai Lu580e0ad2010-02-16 18:40:35 -0800198config HAVE_EARLY_RES
199 def_bool y
200
Shane Wang69575d32009-09-01 18:25:07 -0700201config HAVE_INTEL_TXT
202 def_bool y
203 depends on EXPERIMENTAL && DMAR && ACPI
204
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100205# Use the generic interrupt handling code in kernel/irq/:
206config GENERIC_HARDIRQS
Jan Beulich6fc108a2010-04-21 15:23:44 +0100207 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100208
Thomas Gleixnerf9a36fa2009-03-13 16:37:48 +0100209config GENERIC_HARDIRQS_NO__DO_IRQ
210 def_bool y
211
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100212config GENERIC_IRQ_PROBE
Jan Beulich6fc108a2010-04-21 15:23:44 +0100213 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100214
215config GENERIC_PENDING_IRQ
Jan Beulich6fc108a2010-04-21 15:23:44 +0100216 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100217 depends on GENERIC_HARDIRQS && SMP
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100218
James Bottomley6cd10f82008-11-09 11:53:14 -0600219config USE_GENERIC_SMP_HELPERS
220 def_bool y
221 depends on SMP
222
Sam Ravnborg6b0c3d42008-01-30 13:32:27 +0100223config X86_32_SMP
224 def_bool y
225 depends on X86_32 && SMP
226
227config X86_64_SMP
228 def_bool y
229 depends on X86_64 && SMP
230
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100231config X86_HT
Jan Beulich6fc108a2010-04-21 15:23:44 +0100232 def_bool y
Adrian Bunkee0011a2007-12-04 17:19:07 +0100233 depends on SMP
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100234
235config X86_TRAMPOLINE
Jan Beulich6fc108a2010-04-21 15:23:44 +0100236 def_bool y
Ingo Molnar3e5095d2009-01-27 17:07:08 +0100237 depends on SMP || (64BIT && ACPI_SLEEP)
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100238
Tejun Heoccbeed32009-02-09 22:17:40 +0900239config X86_32_LAZY_GS
240 def_bool y
Tejun Heo60a53172009-02-09 22:17:40 +0900241 depends on X86_32 && !CC_STACKPROTECTOR
Tejun Heoccbeed32009-02-09 22:17:40 +0900242
Borislav Petkovd61931d2010-03-05 17:34:46 +0100243config ARCH_HWEIGHT_CFLAGS
244 string
245 default "-fcall-saved-ecx -fcall-saved-edx" if X86_32
246 default "-fcall-saved-rdi -fcall-saved-rsi -fcall-saved-rdx -fcall-saved-rcx -fcall-saved-r8 -fcall-saved-r9 -fcall-saved-r10 -fcall-saved-r11" if X86_64
247
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100248config KTIME_SCALAR
249 def_bool X86_32
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100250source "init/Kconfig"
Matt Helsleydc52ddc2008-10-18 20:27:21 -0700251source "kernel/Kconfig.freezer"
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100252
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100253menu "Processor type and features"
254
255source "kernel/time/Kconfig"
256
257config SMP
258 bool "Symmetric multi-processing support"
259 ---help---
260 This enables support for systems with more than one CPU. If you have
261 a system with only one CPU, like most personal computers, say N. If
262 you have a system with more than one CPU, say Y.
263
264 If you say N here, the kernel will run on single and multiprocessor
265 machines, but will use only one CPU of a multiprocessor machine. If
266 you say Y here, the kernel will run on many, but not all,
267 singleprocessor machines. On a singleprocessor machine, the kernel
268 will run faster if you say N here.
269
270 Note that if you say Y here and choose architecture "586" or
271 "Pentium" under "Processor family", the kernel will not work on 486
272 architectures. Similarly, multiprocessor kernels for the "PPro"
273 architecture may not work on all Pentium based boards.
274
275 People using multiprocessor machines who say Y here should also say
276 Y to "Enhanced Real Time Clock Support", below. The "Advanced Power
277 Management" code will be disabled if you say Y here.
278
Adrian Bunk03502fa2008-02-03 15:50:21 +0200279 See also <file:Documentation/i386/IO-APIC.txt>,
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100280 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
281 <http://www.tldp.org/docs.html#howto>.
282
283 If you don't know what to do here, say N.
284
Yinghai Lu06cd9a72009-02-16 17:29:58 -0800285config X86_X2APIC
286 bool "Support x2apic"
David Woodhousef7d7f862009-04-06 23:04:40 -0700287 depends on X86_LOCAL_APIC && X86_64 && INTR_REMAP
Yinghai Lu06cd9a72009-02-16 17:29:58 -0800288 ---help---
289 This enables x2apic support on CPUs that have this feature.
290
291 This allows 32-bit apic IDs (so it can support very large systems),
292 and accesses the local apic via MSRs not via mmio.
293
Yinghai Lu06cd9a72009-02-16 17:29:58 -0800294 If you don't know what to do here, say N.
295
Yinghai Lu0b8f1ef2008-12-05 18:58:31 -0800296config SPARSE_IRQ
297 bool "Support sparse irq numbering"
Yinghai Lu17483a12008-12-12 13:14:18 -0800298 depends on PCI_MSI || HT_IRQ
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100299 ---help---
Ingo Molnar973656f2008-12-25 16:26:47 +0100300 This enables support for sparse irqs. This is useful for distro
301 kernels that want to define a high CONFIG_NR_CPUS value but still
302 want to have low kernel memory footprint on smaller machines.
Yinghai Lu0b8f1ef2008-12-05 18:58:31 -0800303
Ingo Molnar973656f2008-12-25 16:26:47 +0100304 ( Sparse IRQs can also be beneficial on NUMA boxes, as they spread
305 out the irq_desc[] array in a more NUMA-friendly way. )
306
307 If you don't know what to do here, say N.
Yinghai Lu0b8f1ef2008-12-05 18:58:31 -0800308
Yinghai Lu15e957d2009-04-30 01:17:50 -0700309config NUMA_IRQ_DESC
310 def_bool y
Yinghai Lub9098952008-12-19 13:48:34 -0800311 depends on SPARSE_IRQ && NUMA
Yinghai Lu48a1b102008-12-11 00:15:01 -0800312
Yinghai Lu6695c852008-06-19 12:13:09 -0700313config X86_MPPARSE
Jan Beulich7a527682008-10-30 10:38:24 +0000314 bool "Enable MPS table" if ACPI
315 default y
Ingo Molnar5ab74722008-07-10 14:42:03 +0200316 depends on X86_LOCAL_APIC
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100317 ---help---
Yinghai Lu6695c852008-06-19 12:13:09 -0700318 For old smp systems that do not have proper acpi support. Newer systems
319 (esp with 64bit cpus) with acpi support, MADT and DSDT will override it
Yinghai Lu6695c852008-06-19 12:13:09 -0700320
Yinghai Lu26f7ef12009-01-29 14:19:22 -0800321config X86_BIGSMP
322 bool "Support for big SMP systems with more than 8 CPUs"
323 depends on X86_32 && SMP
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100324 ---help---
Yinghai Lu26f7ef12009-01-29 14:19:22 -0800325 This option is needed for the systems that have more than 8 CPUs
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100326
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800327if X86_32
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800328config X86_EXTENDED_PLATFORM
329 bool "Support for extended (non-PC) x86 platforms"
330 default y
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100331 ---help---
Ingo Molnar06ac8342009-01-27 18:11:43 +0100332 If you disable this option then the kernel will only support
333 standard PC platforms. (which covers the vast majority of
334 systems out there.)
335
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800336 If you enable this option then you'll be able to select support
337 for the following (non-PC) 32 bit x86 platforms:
338 AMD Elan
339 NUMAQ (IBM/Sequent)
340 RDC R-321x SoC
341 SGI 320/540 (Visual Workstation)
342 Summit/EXA (IBM x440)
343 Unisys ES7000 IA32 series
Thomas Gleixner3f4110a2009-08-29 14:54:20 +0200344 Moorestown MID devices
Ingo Molnar06ac8342009-01-27 18:11:43 +0100345
346 If you have one of these systems, or if you want to build a
347 generic distribution kernel, say Y here - otherwise say N.
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800348endif
Ingo Molnar06ac8342009-01-27 18:11:43 +0100349
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800350if X86_64
351config X86_EXTENDED_PLATFORM
352 bool "Support for extended (non-PC) x86 platforms"
353 default y
354 ---help---
355 If you disable this option then the kernel will only support
356 standard PC platforms. (which covers the vast majority of
357 systems out there.)
358
359 If you enable this option then you'll be able to select support
360 for the following (non-PC) 64 bit x86 platforms:
361 ScaleMP vSMP
362 SGI Ultraviolet
363
364 If you have one of these systems, or if you want to build a
365 generic distribution kernel, say Y here - otherwise say N.
366endif
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800367# This is an alphabetically sorted list of 64 bit extended platforms
368# Please maintain the alphabetic order if and when there are additions
Nick Piggin03b48632009-01-20 04:36:04 +0100369
Ingo Molnar6a485652009-01-27 18:29:13 +0100370config X86_VSMP
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800371 bool "ScaleMP vSMP"
Ingo Molnar6a485652009-01-27 18:29:13 +0100372 select PARAVIRT
373 depends on X86_64 && PCI
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800374 depends on X86_EXTENDED_PLATFORM
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100375 ---help---
Ingo Molnar6a485652009-01-27 18:29:13 +0100376 Support for ScaleMP vSMP systems. Say 'Y' here if this kernel is
377 supposed to run on these EM64T-based machines. Only choose this option
378 if you have one of these machines.
379
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800380config X86_UV
381 bool "SGI Ultraviolet"
382 depends on X86_64
383 depends on X86_EXTENDED_PLATFORM
Jack Steiner54c28d22009-04-03 15:39:42 -0500384 depends on NUMA
Suresh Siddha9d6c26e2009-04-20 13:02:31 -0700385 depends on X86_X2APIC
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800386 ---help---
387 This option is needed in order to support SGI Ultraviolet systems.
388 If you don't have one of these, you should say N here.
389
390# Following is an alphabetically sorted list of 32 bit extended platforms
391# Please maintain the alphabetic order if and when there are additions
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100392
393config X86_ELAN
394 bool "AMD Elan"
395 depends on X86_32
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800396 depends on X86_EXTENDED_PLATFORM
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100397 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100398 Select this for an AMD Elan processor.
399
400 Do not use this option for K6/Athlon/Opteron processors!
401
402 If unsure, choose "PC-compatible" instead.
403
Thomas Gleixner3f4110a2009-08-29 14:54:20 +0200404config X86_MRST
405 bool "Moorestown MID platform"
Jacob Pan4b2f3f72010-02-25 10:02:14 -0800406 depends on PCI
407 depends on PCI_GOANY
Thomas Gleixner3f4110a2009-08-29 14:54:20 +0200408 depends on X86_32
409 depends on X86_EXTENDED_PLATFORM
Jacob Pan4b2f3f72010-02-25 10:02:14 -0800410 depends on X86_IO_APIC
Jacob Panbb24c472009-09-02 07:37:17 -0700411 select APB_TIMER
Thomas Gleixner3f4110a2009-08-29 14:54:20 +0200412 ---help---
413 Moorestown is Intel's Low Power Intel Architecture (LPIA) based Moblin
414 Internet Device(MID) platform. Moorestown consists of two chips:
415 Lincroft (CPU core, graphics, and memory controller) and Langwell IOH.
416 Unlike standard x86 PCs, Moorestown does not have many legacy devices
417 nor standard legacy replacement devices/features. e.g. Moorestown does
418 not contain i8259, i8254, HPET, legacy BIOS, most of the io ports.
419
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800420config X86_RDC321X
421 bool "RDC R-321x SoC"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100422 depends on X86_32
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800423 depends on X86_EXTENDED_PLATFORM
424 select M486
425 select X86_REBOOTFIXUPS
426 ---help---
427 This option is needed for RDC R-321x system-on-chip, also known
428 as R-8610-(G).
429 If you don't have one of these chips, you should say N here.
430
Ingo Molnare0c7ae32009-01-27 18:43:09 +0100431config X86_32_NON_STANDARD
Ingo Molnar9c398012009-01-27 18:24:57 +0100432 bool "Support non-standard 32-bit SMP architectures"
433 depends on X86_32 && SMP
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800434 depends on X86_EXTENDED_PLATFORM
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100435 ---help---
436 This option compiles in the NUMAQ, Summit, bigsmp, ES7000, default
Yinghai Lud49c4282008-06-08 18:31:54 -0700437 subarchitectures. It is intended for a generic binary kernel.
438 if you select them all, kernel will probe it one by one. and will
439 fallback to default.
440
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800441# Alphabetically sorted list of Non standard 32 bit platforms
Yinghai Lud49c4282008-06-08 18:31:54 -0700442
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100443config X86_NUMAQ
444 bool "NUMAQ (IBM/Sequent)"
Ingo Molnare0c7ae32009-01-27 18:43:09 +0100445 depends on X86_32_NON_STANDARD
Pan, Jacob juna92d1522010-02-24 16:59:55 -0800446 depends on PCI
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100447 select NUMA
Ingo Molnar9c398012009-01-27 18:24:57 +0100448 select X86_MPPARSE
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100449 ---help---
Yinghai Lud49c4282008-06-08 18:31:54 -0700450 This option is used for getting Linux to run on a NUMAQ (IBM/Sequent)
451 NUMA multiquad box. This changes the way that processors are
452 bootstrapped, and uses Clustered Logical APIC addressing mode instead
453 of Flat Logical. You will need a new lynxer.elf file to flash your
454 firmware with - send email to <Martin.Bligh@us.ibm.com>.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100455
Linus Torvaldsd949f362009-09-26 09:35:07 -0700456config X86_SUPPORTS_MEMORY_FAILURE
Jan Beulich6fc108a2010-04-21 15:23:44 +0100457 def_bool y
Linus Torvaldsd949f362009-09-26 09:35:07 -0700458 # MCE code calls memory_failure():
459 depends on X86_MCE
460 # On 32-bit this adds too big of NODES_SHIFT and we run out of page flags:
461 depends on !X86_NUMAQ
462 # On 32-bit SPARSEMEM adds too big of SECTIONS_WIDTH:
463 depends on X86_64 || !SPARSEMEM
464 select ARCH_SUPPORTS_MEMORY_FAILURE
Linus Torvaldsd949f362009-09-26 09:35:07 -0700465
Ingo Molnar1b84e1c2008-07-10 15:55:27 +0200466config X86_VISWS
467 bool "SGI 320/540 (Visual Workstation)"
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800468 depends on X86_32 && PCI && X86_MPPARSE && PCI_GODIRECT
469 depends on X86_32_NON_STANDARD
470 ---help---
Ingo Molnar1b84e1c2008-07-10 15:55:27 +0200471 The SGI Visual Workstation series is an IA32-based workstation
472 based on SGI systems chips with some legacy PC hardware attached.
473
474 Say Y here to create a kernel to run on the SGI 320 or 540.
475
476 A kernel compiled for the Visual Workstation will run on general
477 PCs as well. See <file:Documentation/sgi-visws.txt> for details.
478
Ingo Molnar9c398012009-01-27 18:24:57 +0100479config X86_SUMMIT
480 bool "Summit/EXA (IBM x440)"
Ingo Molnare0c7ae32009-01-27 18:43:09 +0100481 depends on X86_32_NON_STANDARD
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100482 ---help---
Ingo Molnar9c398012009-01-27 18:24:57 +0100483 This option is needed for IBM systems that use the Summit/EXA chipset.
484 In particular, it is needed for the x440.
Ingo Molnar1f972762008-07-26 13:52:50 +0200485
Ingo Molnar9c398012009-01-27 18:24:57 +0100486config X86_ES7000
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800487 bool "Unisys ES7000 IA32 series"
Yinghai Lu26f7ef12009-01-29 14:19:22 -0800488 depends on X86_32_NON_STANDARD && X86_BIGSMP
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100489 ---help---
Ingo Molnar9c398012009-01-27 18:24:57 +0100490 Support for Unisys ES7000 systems. Say 'Y' here if this kernel is
491 supposed to run on an IA32-based Unisys ES7000 system.
492
Ingo Molnarae1e9132008-11-11 09:05:16 +0100493config SCHED_OMIT_FRAME_POINTER
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100494 def_bool y
495 prompt "Single-depth WCHAN output"
Ken Chena87d0912008-11-06 11:10:49 -0800496 depends on X86
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100497 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100498 Calculate simpler /proc/<PID>/wchan values. If this option
499 is disabled then wchan values will recurse back to the
500 caller function. This provides more accurate wchan values,
501 at the expense of slightly more scheduling overhead.
502
503 If in doubt, say "Y".
504
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100505menuconfig PARAVIRT_GUEST
506 bool "Paravirtualized guest support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100507 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100508 Say Y here to get to see options related to running Linux under
509 various hypervisors. This option alone does not add any kernel code.
510
511 If you say N, all options in this submenu will be skipped and disabled.
512
513if PARAVIRT_GUEST
514
515source "arch/x86/xen/Kconfig"
516
517config VMI
Alok Katariad0153ca2009-09-29 10:25:24 -0700518 bool "VMI Guest support (DEPRECATED)"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100519 select PARAVIRT
Eduardo Pereira Habkost42d545c2008-01-30 13:33:32 +0100520 depends on X86_32
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100521 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100522 VMI provides a paravirtualized interface to the VMware ESX server
523 (it could be used by other hypervisors in theory too, but is not
524 at the moment), by linking the kernel to a GPL-ed ROM module
525 provided by the hypervisor.
526
Alok Katariad0153ca2009-09-29 10:25:24 -0700527 As of September 2009, VMware has started a phased retirement
528 of this feature from VMware's products. Please see
529 feature-removal-schedule.txt for details. If you are
530 planning to enable this option, please note that you cannot
531 live migrate a VMI enabled VM to a future VMware product,
532 which doesn't support VMI. So if you expect your kernel to
533 seamlessly migrate to newer VMware products, keep this
534 disabled.
535
Glauber de Oliveira Costa790c73f2008-02-15 17:52:48 -0200536config KVM_CLOCK
537 bool "KVM paravirtualized clock"
538 select PARAVIRT
Gerd Hoffmannf6e16d52008-06-03 16:17:32 +0200539 select PARAVIRT_CLOCK
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100540 ---help---
Glauber de Oliveira Costa790c73f2008-02-15 17:52:48 -0200541 Turning on this option will allow you to run a paravirtualized clock
542 when running over the KVM hypervisor. Instead of relying on a PIT
543 (or probably other) emulation by the underlying device model, the host
544 provides the guest with timing infrastructure such as time of day, and
545 system time
546
Marcelo Tosatti0cf1bfd2008-02-22 12:21:36 -0500547config KVM_GUEST
548 bool "KVM Guest support"
549 select PARAVIRT
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100550 ---help---
551 This option enables various optimizations for running under the KVM
552 hypervisor.
Marcelo Tosatti0cf1bfd2008-02-22 12:21:36 -0500553
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100554source "arch/x86/lguest/Kconfig"
555
Eduardo Pereira Habkoste61bd942008-01-30 13:33:32 +0100556config PARAVIRT
557 bool "Enable paravirtualization code"
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100558 ---help---
Eduardo Pereira Habkoste61bd942008-01-30 13:33:32 +0100559 This changes the kernel so it can modify itself when it is run
560 under a hypervisor, potentially improving performance significantly
561 over full virtualization. However, when run without a hypervisor
562 the kernel is theoretically slower and slightly larger.
563
Jeremy Fitzhardingeb4ecc122009-05-13 17:16:55 -0700564config PARAVIRT_SPINLOCKS
565 bool "Paravirtualization layer for spinlocks"
566 depends on PARAVIRT && SMP && EXPERIMENTAL
567 ---help---
568 Paravirtualized spinlocks allow a pvops backend to replace the
569 spinlock implementation with something virtualization-friendly
570 (for example, block the virtual CPU rather than spinning).
571
572 Unfortunately the downside is an up to 5% performance hit on
573 native kernels, with various workloads.
574
575 If you are unsure how to answer this question, answer N.
576
Gerd Hoffmann7af192c2008-06-03 16:17:29 +0200577config PARAVIRT_CLOCK
578 bool
Gerd Hoffmann7af192c2008-06-03 16:17:29 +0200579
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100580endif
581
Jeremy Fitzhardinge97349132008-06-25 00:19:14 -0400582config PARAVIRT_DEBUG
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100583 bool "paravirt-ops debugging"
584 depends on PARAVIRT && DEBUG_KERNEL
585 ---help---
586 Enable to debug paravirt_ops internals. Specifically, BUG if
587 a paravirt_op is missing when it is called.
Jeremy Fitzhardinge97349132008-06-25 00:19:14 -0400588
Yinghai Lu08677212010-02-10 01:20:20 -0800589config NO_BOOTMEM
590 default y
591 bool "Disable Bootmem code"
Yinghai Lu08677212010-02-10 01:20:20 -0800592 ---help---
593 Use early_res directly instead of bootmem before slab is ready.
594 - allocator (buddy) [generic]
595 - early allocator (bootmem) [generic]
596 - very early allocator (reserve_early*()) [x86]
597 - very very early allocator (early brk model) [x86]
598 So reduce one layer between early allocator to final allocator
599
600
Yinghai Lu03273182008-04-18 17:49:15 -0700601config MEMTEST
602 bool "Memtest"
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100603 ---help---
Yinghai Luc64df702008-03-21 18:56:19 -0700604 This option adds a kernel parameter 'memtest', which allows memtest
Yinghai Lu03273182008-04-18 17:49:15 -0700605 to be set.
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100606 memtest=0, mean disabled; -- default
607 memtest=1, mean do 1 test pattern;
608 ...
609 memtest=4, mean do 4 test patterns.
Thomas Gleixneraba37282008-07-15 14:48:48 +0200610 If you are unsure how to answer this question, answer N.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100611
612config X86_SUMMIT_NUMA
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100613 def_bool y
Ingo Molnare0c7ae32009-01-27 18:43:09 +0100614 depends on X86_32 && NUMA && X86_32_NON_STANDARD
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100615
616config X86_CYCLONE_TIMER
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100617 def_bool y
Ingo Molnare0c7ae32009-01-27 18:43:09 +0100618 depends on X86_32_NON_STANDARD
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100619
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100620source "arch/x86/Kconfig.cpu"
621
622config HPET_TIMER
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100623 def_bool X86_64
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100624 prompt "HPET Timer Support" if X86_32
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100625 ---help---
626 Use the IA-PC HPET (High Precision Event Timer) to manage
627 time in preference to the PIT and RTC, if a HPET is
628 present.
629 HPET is the next generation timer replacing legacy 8254s.
630 The HPET provides a stable time base on SMP
631 systems, unlike the TSC, but it is more expensive to access,
632 as it is off-chip. You can find the HPET spec at
633 <http://www.intel.com/hardwaredesign/hpetspec_1.pdf>.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100634
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100635 You can safely choose Y here. However, HPET will only be
636 activated if the platform and the BIOS support this feature.
637 Otherwise the 8254 will be used for timing services.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100638
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100639 Choose N to continue using the legacy 8254 timer.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100640
641config HPET_EMULATE_RTC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100642 def_bool y
Bernhard Walle9d8af782008-02-06 01:38:52 -0800643 depends on HPET_TIMER && (RTC=y || RTC=m || RTC_DRV_CMOS=m || RTC_DRV_CMOS=y)
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100644
Jacob Panbb24c472009-09-02 07:37:17 -0700645config APB_TIMER
646 def_bool y if MRST
647 prompt "Langwell APB Timer Support" if X86_MRST
648 help
649 APB timer is the replacement for 8254, HPET on X86 MID platforms.
650 The APBT provides a stable time base on SMP
651 systems, unlike the TSC, but it is more expensive to access,
652 as it is off-chip. APB timers are always running regardless of CPU
653 C states, they are used as per CPU clockevent device when possible.
654
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100655# Mark as embedded because too many people got it wrong.
656# The code disables itself when not needed.
Thomas Petazzoni7ae93922008-04-28 02:14:14 -0700657config DMI
658 default y
659 bool "Enable DMI scanning" if EMBEDDED
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100660 ---help---
Thomas Petazzoni7ae93922008-04-28 02:14:14 -0700661 Enabled scanning of DMI to identify machine quirks. Say Y
662 here unless you have verified that your setup is not
663 affected by entries in the DMI blacklist. Required by PNP
664 BIOS code.
665
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100666config GART_IOMMU
667 bool "GART IOMMU support" if EMBEDDED
668 default y
669 select SWIOTLB
Borislav Petkov0e152cd2010-03-12 15:43:03 +0100670 depends on X86_64 && PCI && K8_NB
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100671 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100672 Support for full DMA access of devices with 32bit memory access only
673 on systems with more than 3GB. This is usually needed for USB,
674 sound, many IDE/SATA chipsets and some other devices.
675 Provides a driver for the AMD Athlon64/Opteron/Turion/Sempron GART
676 based hardware IOMMU and a software bounce buffer based IOMMU used
677 on Intel systems and as fallback.
678 The code is only active when needed (enough memory and limited
679 device) unless CONFIG_IOMMU_DEBUG or iommu=force is specified
680 too.
681
682config CALGARY_IOMMU
683 bool "IBM Calgary IOMMU support"
684 select SWIOTLB
685 depends on X86_64 && PCI && EXPERIMENTAL
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100686 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100687 Support for hardware IOMMUs in IBM's xSeries x366 and x460
688 systems. Needed to run systems with more than 3GB of memory
689 properly with 32-bit PCI devices that do not support DAC
690 (Double Address Cycle). Calgary also supports bus level
691 isolation, where all DMAs pass through the IOMMU. This
692 prevents them from going anywhere except their intended
693 destination. This catches hard-to-find kernel bugs and
694 mis-behaving drivers and devices that do not use the DMA-API
695 properly to set up their DMA buffers. The IOMMU can be
696 turned off at boot time with the iommu=off parameter.
697 Normally the kernel will make the right choice by itself.
698 If unsure, say Y.
699
700config CALGARY_IOMMU_ENABLED_BY_DEFAULT
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100701 def_bool y
702 prompt "Should Calgary be enabled by default?"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100703 depends on CALGARY_IOMMU
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100704 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100705 Should Calgary be enabled by default? if you choose 'y', Calgary
706 will be used (if it exists). If you choose 'n', Calgary will not be
707 used even if it exists. If you choose 'n' and would like to use
708 Calgary anyway, pass 'iommu=calgary' on the kernel command line.
709 If unsure, say Y.
710
Joerg Roedel2b188722008-06-26 21:27:37 +0200711config AMD_IOMMU
712 bool "AMD IOMMU support"
Ingo Molnar07c40e82008-06-27 11:31:28 +0200713 select SWIOTLB
Joerg Roedela80dc3e2008-09-11 16:51:41 +0200714 select PCI_MSI
Ingo Molnar24d2ba02008-06-27 10:37:03 +0200715 depends on X86_64 && PCI && ACPI
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100716 ---help---
Joerg Roedel18d22202008-07-03 19:35:06 +0200717 With this option you can enable support for AMD IOMMU hardware in
718 your system. An IOMMU is a hardware component which provides
719 remapping of DMA memory accesses from devices. With an AMD IOMMU you
720 can isolate the the DMA memory of different devices and protect the
721 system from misbehaving device drivers or hardware.
722
723 You can find out if your system has an AMD IOMMU if you look into
724 your BIOS for an option to enable it or if you have an IVRS ACPI
725 table.
Joerg Roedel2b188722008-06-26 21:27:37 +0200726
Joerg Roedel2e117602008-12-11 19:00:12 +0100727config AMD_IOMMU_STATS
728 bool "Export AMD IOMMU statistics to debugfs"
729 depends on AMD_IOMMU
730 select DEBUG_FS
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100731 ---help---
Joerg Roedel2e117602008-12-11 19:00:12 +0100732 This option enables code in the AMD IOMMU driver to collect various
733 statistics about whats happening in the driver and exports that
734 information to userspace via debugfs.
735 If unsure, say N.
736
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100737# need this always selected by IOMMU for the VIA workaround
738config SWIOTLB
Joerg Roedela1afd012008-11-18 12:44:21 +0100739 def_bool y if X86_64
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100740 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100741 Support for software bounce buffers used on x86-64 systems
742 which don't have a hardware IOMMU (e.g. the current generation
743 of Intel's x86-64 CPUs). Using this PCI devices which can only
744 access 32-bits of memory can be used on systems with more than
745 3 GB of memory. If unsure, say Y.
746
FUJITA Tomonoria8522502008-04-29 00:59:36 -0700747config IOMMU_HELPER
FUJITA Tomonori18b743d2008-07-10 09:50:50 +0900748 def_bool (CALGARY_IOMMU || GART_IOMMU || SWIOTLB || AMD_IOMMU)
Linus Torvaldsd25e26b2008-08-25 14:15:38 -0700749
Joerg Roedel1aaf1182008-11-26 17:25:13 +0100750config IOMMU_API
751 def_bool (AMD_IOMMU || DMAR)
752
Mike Travis1184dc22008-05-12 21:21:12 +0200753config MAXSMP
754 bool "Configure Maximum number of SMP Processors and NUMA Nodes"
Mike Travis36f51012008-12-16 17:33:51 -0800755 depends on X86_64 && SMP && DEBUG_KERNEL && EXPERIMENTAL
756 select CPUMASK_OFFSTACK
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100757 ---help---
Mike Travis1184dc22008-05-12 21:21:12 +0200758 Configure maximum number of CPUS and NUMA Nodes for this architecture.
759 If unsure, say N.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100760
761config NR_CPUS
Mike Travis36f51012008-12-16 17:33:51 -0800762 int "Maximum number of CPUs" if SMP && !MAXSMP
Michael K. Johnson2a3313f2009-04-21 21:44:48 -0400763 range 2 8 if SMP && X86_32 && !X86_BIGSMP
Mike Travis36f51012008-12-16 17:33:51 -0800764 range 2 512 if SMP && !MAXSMP
Mike Travis78637a972008-12-16 17:34:00 -0800765 default "1" if !SMP
Linus Torvaldsd25e26b2008-08-25 14:15:38 -0700766 default "4096" if MAXSMP
Mike Travis78637a972008-12-16 17:34:00 -0800767 default "32" if SMP && (X86_NUMAQ || X86_SUMMIT || X86_BIGSMP || X86_ES7000)
768 default "8" if SMP
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100769 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100770 This allows you to specify the maximum number of CPUs which this
Linus Torvaldsd25e26b2008-08-25 14:15:38 -0700771 kernel will support. The maximum supported value is 512 and the
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100772 minimum value which makes sense is 2.
773
774 This is purely to save memory - each supported CPU adds
775 approximately eight kilobytes to the kernel image.
776
777config SCHED_SMT
778 bool "SMT (Hyperthreading) scheduler support"
Hiroshi Shimamotob089c122008-02-27 13:16:30 -0800779 depends on X86_HT
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100780 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100781 SMT scheduler support improves the CPU scheduler's decision making
782 when dealing with Intel Pentium 4 chips with HyperThreading at a
783 cost of slightly increased overhead in some places. If unsure say
784 N here.
785
786config SCHED_MC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100787 def_bool y
788 prompt "Multi-core scheduler support"
Hiroshi Shimamotob089c122008-02-27 13:16:30 -0800789 depends on X86_HT
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100790 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100791 Multi-core scheduler support improves the CPU scheduler's decision
792 making when dealing with multi-core CPU chips at a cost of slightly
793 increased overhead in some places. If unsure say N here.
794
795source "kernel/Kconfig.preempt"
796
797config X86_UP_APIC
798 bool "Local APIC support on uniprocessors"
Ingo Molnare0c7ae32009-01-27 18:43:09 +0100799 depends on X86_32 && !SMP && !X86_32_NON_STANDARD
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100800 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100801 A local APIC (Advanced Programmable Interrupt Controller) is an
802 integrated interrupt controller in the CPU. If you have a single-CPU
803 system which has a processor with a local APIC, you can say Y here to
804 enable and use it. If you say Y here even though your machine doesn't
805 have a local APIC, then the kernel will still run with no slowdown at
806 all. The local APIC supports CPU-generated self-interrupts (timer,
807 performance counters), and the NMI watchdog which detects hard
808 lockups.
809
810config X86_UP_IOAPIC
811 bool "IO-APIC support on uniprocessors"
812 depends on X86_UP_APIC
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100813 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100814 An IO-APIC (I/O Advanced Programmable Interrupt Controller) is an
815 SMP-capable replacement for PC-style interrupt controllers. Most
816 SMP systems and many recent uniprocessor systems have one.
817
818 If you have a single-CPU system with an IO-APIC, you can say Y here
819 to use it. If you say Y here even though your machine doesn't have
820 an IO-APIC, then the kernel will still run with no slowdown at all.
821
822config X86_LOCAL_APIC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100823 def_bool y
Ingo Molnare0c7ae32009-01-27 18:43:09 +0100824 depends on X86_64 || SMP || X86_32_NON_STANDARD || X86_UP_APIC
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100825
826config X86_IO_APIC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100827 def_bool y
Ingo Molnare0c7ae32009-01-27 18:43:09 +0100828 depends on X86_64 || SMP || X86_32_NON_STANDARD || X86_UP_APIC
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100829
830config X86_VISWS_APIC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100831 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100832 depends on X86_32 && X86_VISWS
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100833
Stefan Assmann41b9eb22008-07-15 13:48:55 +0200834config X86_REROUTE_FOR_BROKEN_BOOT_IRQS
835 bool "Reroute for broken boot IRQs"
Stefan Assmann41b9eb22008-07-15 13:48:55 +0200836 depends on X86_IO_APIC
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100837 ---help---
Stefan Assmann41b9eb22008-07-15 13:48:55 +0200838 This option enables a workaround that fixes a source of
839 spurious interrupts. This is recommended when threaded
840 interrupt handling is used on systems where the generation of
841 superfluous "boot interrupts" cannot be disabled.
842
843 Some chipsets generate a legacy INTx "boot IRQ" when the IRQ
844 entry in the chipset's IO-APIC is masked (as, e.g. the RT
845 kernel does during interrupt handling). On chipsets where this
846 boot IRQ generation cannot be disabled, this workaround keeps
847 the original IRQ line masked so that only the equivalent "boot
848 IRQ" is delivered to the CPUs. The workaround also tells the
849 kernel to set up the IRQ handler on the boot IRQ line. In this
850 way only one interrupt is delivered to the kernel. Otherwise
851 the spurious second interrupt may cause the kernel to bring
852 down (vital) interrupt lines.
853
854 Only affects "broken" chipsets. Interrupt sharing may be
855 increased on these systems.
856
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100857config X86_MCE
Andi Kleenbab9bc62009-07-09 00:31:38 +0200858 bool "Machine Check / overheating reporting"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100859 ---help---
Andi Kleenbab9bc62009-07-09 00:31:38 +0200860 Machine Check support allows the processor to notify the
861 kernel if it detects a problem (e.g. overheating, data corruption).
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100862 The action the kernel takes depends on the severity of the problem,
Andi Kleenbab9bc62009-07-09 00:31:38 +0200863 ranging from warning messages to halting the machine.
Andi Kleen4efc0672009-04-28 19:07:31 +0200864
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100865config X86_MCE_INTEL
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100866 def_bool y
867 prompt "Intel MCE features"
Andi Kleenc1ebf832009-07-09 00:31:41 +0200868 depends on X86_MCE && X86_LOCAL_APIC
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100869 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100870 Additional support for intel specific MCE features such as
871 the thermal monitor.
872
873config X86_MCE_AMD
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100874 def_bool y
875 prompt "AMD MCE features"
Andi Kleenc1ebf832009-07-09 00:31:41 +0200876 depends on X86_MCE && X86_LOCAL_APIC
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100877 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100878 Additional support for AMD specific MCE features such as
879 the DRAM Error Threshold.
880
Andi Kleen4efc0672009-04-28 19:07:31 +0200881config X86_ANCIENT_MCE
Jan Beulich6fc108a2010-04-21 15:23:44 +0100882 bool "Support for old Pentium 5 / WinChip machine checks"
Andi Kleenc31d9632009-07-09 00:31:37 +0200883 depends on X86_32 && X86_MCE
Hidetoshi Setocd13adcc2009-05-27 16:57:31 +0900884 ---help---
885 Include support for machine check handling on old Pentium 5 or WinChip
886 systems. These typically need to be enabled explicitely on the command
887 line.
Andi Kleen4efc0672009-04-28 19:07:31 +0200888
Andi Kleenb2762682009-02-12 13:49:31 +0100889config X86_MCE_THRESHOLD
890 depends on X86_MCE_AMD || X86_MCE_INTEL
Jan Beulich6fc108a2010-04-21 15:23:44 +0100891 def_bool y
Andi Kleenb2762682009-02-12 13:49:31 +0100892
Andi Kleenea149b32009-04-29 19:31:00 +0200893config X86_MCE_INJECT
Andi Kleenc1ebf832009-07-09 00:31:41 +0200894 depends on X86_MCE
Andi Kleenea149b32009-04-29 19:31:00 +0200895 tristate "Machine check injector support"
896 ---help---
897 Provide support for injecting machine checks for testing purposes.
898 If you don't know what a machine check is and you don't do kernel
899 QA it is safe to say n.
900
Andi Kleen4efc0672009-04-28 19:07:31 +0200901config X86_THERMAL_VECTOR
902 def_bool y
Andi Kleen5bb38ad2009-07-09 00:31:39 +0200903 depends on X86_MCE_INTEL
Andi Kleen4efc0672009-04-28 19:07:31 +0200904
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100905config VM86
906 bool "Enable VM86 support" if EMBEDDED
907 default y
908 depends on X86_32
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100909 ---help---
910 This option is required by programs like DOSEMU to run 16-bit legacy
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100911 code on X86 processors. It also may be needed by software like
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100912 XFree86 to initialize some video cards via BIOS. Disabling this
913 option saves about 6k.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100914
915config TOSHIBA
916 tristate "Toshiba Laptop support"
917 depends on X86_32
918 ---help---
919 This adds a driver to safely access the System Management Mode of
920 the CPU on Toshiba portables with a genuine Toshiba BIOS. It does
921 not work on models with a Phoenix BIOS. The System Management Mode
922 is used to set the BIOS and power saving options on Toshiba portables.
923
924 For information on utilities to make use of this driver see the
925 Toshiba Linux utilities web site at:
926 <http://www.buzzard.org.uk/toshiba/>.
927
928 Say Y if you intend to run this kernel on a Toshiba portable.
929 Say N otherwise.
930
931config I8K
932 tristate "Dell laptop support"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100933 ---help---
934 This adds a driver to safely access the System Management Mode
935 of the CPU on the Dell Inspiron 8000. The System Management Mode
936 is used to read cpu temperature and cooling fan status and to
937 control the fans on the I8K portables.
938
939 This driver has been tested only on the Inspiron 8000 but it may
940 also work with other Dell laptops. You can force loading on other
941 models by passing the parameter `force=1' to the module. Use at
942 your own risk.
943
944 For information on utilities to make use of this driver see the
945 I8K Linux utilities web site at:
946 <http://people.debian.org/~dz/i8k/>
947
948 Say Y if you intend to run this kernel on a Dell Inspiron 8000.
949 Say N otherwise.
950
951config X86_REBOOTFIXUPS
Jan Beulich9ba16082008-10-15 22:01:38 -0700952 bool "Enable X86 board specific fixups for reboot"
953 depends on X86_32
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100954 ---help---
955 This enables chipset and/or board specific fixups to be done
956 in order to get reboot to work correctly. This is only needed on
957 some combinations of hardware and BIOS. The symptom, for which
958 this config is intended, is when reboot ends with a stalled/hung
959 system.
960
961 Currently, the only fixup is for the Geode machines using
Florian Fainelli5e3a77e2008-01-30 13:33:36 +0100962 CS5530A and CS5536 chipsets and the RDC R-321x SoC.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100963
964 Say Y if you want to enable the fixup. Currently, it's safe to
965 enable this option even if you don't need it.
966 Say N otherwise.
967
968config MICROCODE
Peter Oruba8d86f392008-07-28 18:44:21 +0200969 tristate "/dev/cpu/microcode - microcode support"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100970 select FW_LOADER
971 ---help---
972 If you say Y here, you will be able to update the microcode on
Peter Oruba80cc9f12008-07-28 18:44:22 +0200973 certain Intel and AMD processors. The Intel support is for the
974 IA32 family, e.g. Pentium Pro, Pentium II, Pentium III,
975 Pentium 4, Xeon etc. The AMD support is for family 0x10 and
976 0x11 processors, e.g. Opteron, Phenom and Turion 64 Ultra.
977 You will obviously need the actual microcode binary data itself
978 which is not shipped with the Linux kernel.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100979
Peter Oruba8d86f392008-07-28 18:44:21 +0200980 This option selects the general module only, you need to select
981 at least one vendor specific module as well.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100982
983 To compile this driver as a module, choose M here: the
984 module will be called microcode.
985
Peter Oruba8d86f392008-07-28 18:44:21 +0200986config MICROCODE_INTEL
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100987 bool "Intel microcode patch loading support"
988 depends on MICROCODE
989 default MICROCODE
990 select FW_LOADER
991 ---help---
992 This options enables microcode patch loading support for Intel
993 processors.
Peter Oruba8d86f392008-07-28 18:44:21 +0200994
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100995 For latest news and information on obtaining all the required
996 Intel ingredients for this driver, check:
997 <http://www.urbanmyth.org/microcode/>.
Peter Oruba8d86f392008-07-28 18:44:21 +0200998
Peter Oruba80cc9f12008-07-28 18:44:22 +0200999config MICROCODE_AMD
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001000 bool "AMD microcode patch loading support"
1001 depends on MICROCODE
1002 select FW_LOADER
1003 ---help---
1004 If you select this option, microcode patch loading support for AMD
1005 processors will be enabled.
Peter Oruba80cc9f12008-07-28 18:44:22 +02001006
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001007config MICROCODE_OLD_INTERFACE
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001008 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001009 depends on MICROCODE
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001010
1011config X86_MSR
1012 tristate "/dev/cpu/*/msr - Model-specific register support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001013 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001014 This device gives privileged processes access to the x86
1015 Model-Specific Registers (MSRs). It is a character device with
1016 major 202 and minors 0 to 31 for /dev/cpu/0/msr to /dev/cpu/31/msr.
1017 MSR accesses are directed to a specific CPU on multi-processor
1018 systems.
1019
1020config X86_CPUID
1021 tristate "/dev/cpu/*/cpuid - CPU information support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001022 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001023 This device gives processes access to the x86 CPUID instruction to
1024 be executed on a specific processor. It is a character device
1025 with major 203 and minors 0 to 31 for /dev/cpu/0/cpuid to
1026 /dev/cpu/31/cpuid.
1027
1028choice
1029 prompt "High Memory Support"
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001030 default HIGHMEM64G if X86_NUMAQ
Jan Beulich6fc108a2010-04-21 15:23:44 +01001031 default HIGHMEM4G
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001032 depends on X86_32
1033
1034config NOHIGHMEM
1035 bool "off"
1036 depends on !X86_NUMAQ
1037 ---help---
1038 Linux can use up to 64 Gigabytes of physical memory on x86 systems.
1039 However, the address space of 32-bit x86 processors is only 4
1040 Gigabytes large. That means that, if you have a large amount of
1041 physical memory, not all of it can be "permanently mapped" by the
1042 kernel. The physical memory that's not permanently mapped is called
1043 "high memory".
1044
1045 If you are compiling a kernel which will never run on a machine with
1046 more than 1 Gigabyte total physical RAM, answer "off" here (default
1047 choice and suitable for most users). This will result in a "3GB/1GB"
1048 split: 3GB are mapped so that each process sees a 3GB virtual memory
1049 space and the remaining part of the 4GB virtual memory space is used
1050 by the kernel to permanently map as much physical memory as
1051 possible.
1052
1053 If the machine has between 1 and 4 Gigabytes physical RAM, then
1054 answer "4GB" here.
1055
1056 If more than 4 Gigabytes is used then answer "64GB" here. This
1057 selection turns Intel PAE (Physical Address Extension) mode on.
1058 PAE implements 3-level paging on IA32 processors. PAE is fully
1059 supported by Linux, PAE mode is implemented on all recent Intel
1060 processors (Pentium Pro and better). NOTE: If you say "64GB" here,
1061 then the kernel will not boot on CPUs that don't support PAE!
1062
1063 The actual amount of total physical memory will either be
1064 auto detected or can be forced by using a kernel command line option
1065 such as "mem=256M". (Try "man bootparam" or see the documentation of
1066 your boot loader (lilo or loadlin) about how to pass options to the
1067 kernel at boot time.)
1068
1069 If unsure, say "off".
1070
1071config HIGHMEM4G
1072 bool "4GB"
1073 depends on !X86_NUMAQ
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001074 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001075 Select this if you have a 32-bit processor and between 1 and 4
1076 gigabytes of physical RAM.
1077
1078config HIGHMEM64G
1079 bool "64GB"
1080 depends on !M386 && !M486
1081 select X86_PAE
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001082 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001083 Select this if you have a 32-bit processor and more than 4
1084 gigabytes of physical RAM.
1085
1086endchoice
1087
1088choice
1089 depends on EXPERIMENTAL
1090 prompt "Memory split" if EMBEDDED
1091 default VMSPLIT_3G
1092 depends on X86_32
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001093 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001094 Select the desired split between kernel and user memory.
1095
1096 If the address range available to the kernel is less than the
1097 physical memory installed, the remaining memory will be available
1098 as "high memory". Accessing high memory is a little more costly
1099 than low memory, as it needs to be mapped into the kernel first.
1100 Note that increasing the kernel address space limits the range
1101 available to user programs, making the address space there
1102 tighter. Selecting anything other than the default 3G/1G split
1103 will also likely make your kernel incompatible with binary-only
1104 kernel modules.
1105
1106 If you are not absolutely sure what you are doing, leave this
1107 option alone!
1108
1109 config VMSPLIT_3G
1110 bool "3G/1G user/kernel split"
1111 config VMSPLIT_3G_OPT
1112 depends on !X86_PAE
1113 bool "3G/1G user/kernel split (for full 1G low memory)"
1114 config VMSPLIT_2G
1115 bool "2G/2G user/kernel split"
1116 config VMSPLIT_2G_OPT
1117 depends on !X86_PAE
1118 bool "2G/2G user/kernel split (for full 2G low memory)"
1119 config VMSPLIT_1G
1120 bool "1G/3G user/kernel split"
1121endchoice
1122
1123config PAGE_OFFSET
1124 hex
1125 default 0xB0000000 if VMSPLIT_3G_OPT
1126 default 0x80000000 if VMSPLIT_2G
1127 default 0x78000000 if VMSPLIT_2G_OPT
1128 default 0x40000000 if VMSPLIT_1G
1129 default 0xC0000000
1130 depends on X86_32
1131
1132config HIGHMEM
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001133 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001134 depends on X86_32 && (HIGHMEM64G || HIGHMEM4G)
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001135
1136config X86_PAE
Jan Beulich9ba16082008-10-15 22:01:38 -07001137 bool "PAE (Physical Address Extension) Support"
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001138 depends on X86_32 && !HIGHMEM4G
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001139 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001140 PAE is required for NX support, and furthermore enables
1141 larger swapspace support for non-overcommit purposes. It
1142 has the cost of more pagetable lookup overhead, and also
1143 consumes more pagetable space per process.
1144
Jeremy Fitzhardinge600715d2008-09-11 01:31:45 -07001145config ARCH_PHYS_ADDR_T_64BIT
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001146 def_bool X86_64 || X86_PAE
Jeremy Fitzhardinge600715d2008-09-11 01:31:45 -07001147
Nick Piggin9e899812008-10-22 12:33:16 +02001148config DIRECT_GBPAGES
1149 bool "Enable 1GB pages for kernel pagetables" if EMBEDDED
1150 default y
1151 depends on X86_64
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001152 ---help---
Nick Piggin9e899812008-10-22 12:33:16 +02001153 Allow the kernel linear mapping to use 1GB pages on CPUs that
1154 support it. This can improve the kernel's performance a tiny bit by
1155 reducing TLB pressure. If in doubt, say "Y".
1156
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001157# Common NUMA Features
1158config NUMA
KOSAKI Motohirofd51b2d2008-11-05 02:27:19 +09001159 bool "Numa Memory Allocation and Scheduler Support"
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001160 depends on SMP
Rafael J. Wysocki604d2052008-11-12 23:26:14 +01001161 depends on X86_64 || (X86_32 && HIGHMEM64G && (X86_NUMAQ || X86_BIGSMP || X86_SUMMIT && ACPI) && EXPERIMENTAL)
Yinghai Lu0699eae2008-06-17 15:39:01 -07001162 default y if (X86_NUMAQ || X86_SUMMIT || X86_BIGSMP)
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001163 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001164 Enable NUMA (Non Uniform Memory Access) support.
KOSAKI Motohirofd51b2d2008-11-05 02:27:19 +09001165
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001166 The kernel will try to allocate memory used by a CPU on the
1167 local memory controller of the CPU and add some more
1168 NUMA awareness to the kernel.
1169
Ingo Molnarc280ea52008-11-08 13:29:45 +01001170 For 64-bit this is recommended if the system is Intel Core i7
KOSAKI Motohirofd51b2d2008-11-05 02:27:19 +09001171 (or later), AMD Opteron, or EM64T NUMA.
1172
1173 For 32-bit this is only needed on (rare) 32-bit-only platforms
1174 that support NUMA topologies, such as NUMAQ / Summit, or if you
1175 boot a 32-bit kernel on a 64-bit NUMA platform.
1176
1177 Otherwise, you should say N.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001178
1179comment "NUMA (Summit) requires SMP, 64GB highmem support, ACPI"
1180 depends on X86_32 && X86_SUMMIT && (!HIGHMEM64G || !ACPI)
1181
1182config K8_NUMA
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001183 def_bool y
1184 prompt "Old style AMD Opteron NUMA detection"
1185 depends on X86_64 && NUMA && PCI
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001186 ---help---
1187 Enable K8 NUMA node topology detection. You should say Y here if
1188 you have a multi processor AMD K8 system. This uses an old
1189 method to read the NUMA configuration directly from the builtin
1190 Northbridge of Opteron. It is recommended to use X86_64_ACPI_NUMA
1191 instead, which also takes priority if both are compiled in.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001192
1193config X86_64_ACPI_NUMA
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001194 def_bool y
1195 prompt "ACPI NUMA detection"
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001196 depends on X86_64 && NUMA && ACPI && PCI
1197 select ACPI_NUMA
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001198 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001199 Enable ACPI SRAT based node topology detection.
1200
Suresh Siddha6ec6e0d2008-03-25 10:14:35 -07001201# Some NUMA nodes have memory ranges that span
1202# other nodes. Even though a pfn is valid and
1203# between a node's start and end pfns, it may not
1204# reside on that node. See memmap_init_zone()
1205# for details.
1206config NODES_SPAN_OTHER_NODES
1207 def_bool y
1208 depends on X86_64_ACPI_NUMA
1209
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001210config NUMA_EMU
1211 bool "NUMA emulation"
1212 depends on X86_64 && NUMA
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001213 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001214 Enable NUMA emulation. A flat machine will be split
1215 into virtual nodes when booted with "numa=fake=N", where N is the
1216 number of nodes. This is only useful for debugging.
1217
1218config NODES_SHIFT
Linus Torvaldsd25e26b2008-08-25 14:15:38 -07001219 int "Maximum NUMA Nodes (as a power of 2)" if !MAXSMP
David Rientjes51591e32010-03-25 15:39:27 -07001220 range 1 10
1221 default "10" if MAXSMP
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001222 default "6" if X86_64
1223 default "4" if X86_NUMAQ
1224 default "3"
1225 depends on NEED_MULTIPLE_NODES
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001226 ---help---
Mike Travis1184dc22008-05-12 21:21:12 +02001227 Specify the maximum number of NUMA Nodes available on the target
Matt LaPlante692105b2009-01-26 11:12:25 +01001228 system. Increases memory reserved to accommodate various tables.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001229
Tejun Heoc1329372009-02-24 11:57:20 +09001230config HAVE_ARCH_BOOTMEM
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001231 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001232 depends on X86_32 && NUMA
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001233
1234config ARCH_HAVE_MEMORY_PRESENT
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001235 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001236 depends on X86_32 && DISCONTIGMEM
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001237
1238config NEED_NODE_MEMMAP_SIZE
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001239 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001240 depends on X86_32 && (DISCONTIGMEM || SPARSEMEM)
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001241
1242config HAVE_ARCH_ALLOC_REMAP
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001243 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001244 depends on X86_32 && NUMA
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001245
1246config ARCH_FLATMEM_ENABLE
1247 def_bool y
Jeff Chua99809962008-08-06 19:09:53 +08001248 depends on X86_32 && ARCH_SELECT_MEMORY_MODEL && !NUMA
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001249
1250config ARCH_DISCONTIGMEM_ENABLE
1251 def_bool y
Christoph Lameterb2632952008-01-30 13:30:47 +01001252 depends on NUMA && X86_32
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001253
1254config ARCH_DISCONTIGMEM_DEFAULT
1255 def_bool y
Christoph Lameterb2632952008-01-30 13:30:47 +01001256 depends on NUMA && X86_32
1257
KAMEZAWA Hiroyuki94925872009-09-22 16:45:45 -07001258config ARCH_PROC_KCORE_TEXT
1259 def_bool y
1260 depends on X86_64 && PROC_KCORE
1261
Christoph Lameterb2632952008-01-30 13:30:47 +01001262config ARCH_SPARSEMEM_DEFAULT
1263 def_bool y
1264 depends on X86_64
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001265
1266config ARCH_SPARSEMEM_ENABLE
1267 def_bool y
Yinghai Lu4272ebf2009-01-29 15:14:46 -08001268 depends on X86_64 || NUMA || (EXPERIMENTAL && X86_32) || X86_32_NON_STANDARD
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001269 select SPARSEMEM_STATIC if X86_32
1270 select SPARSEMEM_VMEMMAP_ENABLE if X86_64
1271
1272config ARCH_SELECT_MEMORY_MODEL
1273 def_bool y
Christoph Lameterb2632952008-01-30 13:30:47 +01001274 depends on ARCH_SPARSEMEM_ENABLE
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001275
1276config ARCH_MEMORY_PROBE
1277 def_bool X86_64
1278 depends on MEMORY_HOTPLUG
1279
Avi Kivitya29815a2010-01-10 16:28:09 +02001280config ILLEGAL_POINTER_VALUE
1281 hex
1282 default 0 if X86_32
1283 default 0xdead000000000000 if X86_64
1284
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001285source "mm/Kconfig"
1286
1287config HIGHPTE
1288 bool "Allocate 3rd-level pagetables from highmem"
Jan Beulich6fc108a2010-04-21 15:23:44 +01001289 depends on HIGHMEM
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001290 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001291 The VM uses one page table entry for each page of physical memory.
1292 For systems with a lot of RAM, this can be wasteful of precious
1293 low memory. Setting this option will put user-space page table
1294 entries in high memory.
1295
Jeremy Fitzhardinge9f077872008-09-07 01:51:34 -07001296config X86_CHECK_BIOS_CORRUPTION
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001297 bool "Check for low memory corruption"
1298 ---help---
1299 Periodically check for memory corruption in low memory, which
1300 is suspected to be caused by BIOS. Even when enabled in the
1301 configuration, it is disabled at runtime. Enable it by
1302 setting "memory_corruption_check=1" on the kernel command
1303 line. By default it scans the low 64k of memory every 60
1304 seconds; see the memory_corruption_check_size and
1305 memory_corruption_check_period parameters in
1306 Documentation/kernel-parameters.txt to adjust this.
Jeremy Fitzhardinge9f077872008-09-07 01:51:34 -07001307
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001308 When enabled with the default parameters, this option has
1309 almost no overhead, as it reserves a relatively small amount
1310 of memory and scans it infrequently. It both detects corruption
1311 and prevents it from affecting the running system.
Jeremy Fitzhardinge9f077872008-09-07 01:51:34 -07001312
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001313 It is, however, intended as a diagnostic tool; if repeatable
1314 BIOS-originated corruption always affects the same memory,
1315 you can use memmap= to prevent the kernel from using that
1316 memory.
Jeremy Fitzhardinge9f077872008-09-07 01:51:34 -07001317
Jeremy Fitzhardingec885df52008-09-07 02:37:32 -07001318config X86_BOOTPARAM_MEMORY_CORRUPTION_CHECK
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001319 bool "Set the default setting of memory_corruption_check"
Jeremy Fitzhardingec885df52008-09-07 02:37:32 -07001320 depends on X86_CHECK_BIOS_CORRUPTION
1321 default y
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001322 ---help---
1323 Set whether the default state of memory_corruption_check is
1324 on or off.
Jeremy Fitzhardingec885df52008-09-07 02:37:32 -07001325
Ingo Molnarfc381512008-09-16 10:07:34 +02001326config X86_RESERVE_LOW_64K
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001327 bool "Reserve low 64K of RAM on AMI/Phoenix BIOSen"
Ingo Molnarfc381512008-09-16 10:07:34 +02001328 default y
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001329 ---help---
1330 Reserve the first 64K of physical RAM on BIOSes that are known
1331 to potentially corrupt that memory range. A numbers of BIOSes are
1332 known to utilize this area during suspend/resume, so it must not
1333 be used by the kernel.
Ingo Molnarfc381512008-09-16 10:07:34 +02001334
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001335 Set this to N if you are absolutely sure that you trust the BIOS
1336 to get all its memory reservations and usages right.
Ingo Molnarfc381512008-09-16 10:07:34 +02001337
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001338 If you have doubts about the BIOS (e.g. suspend/resume does not
1339 work or there's kernel crashes after certain hardware hotplug
1340 events) and it's not AMI or Phoenix, then you might want to enable
1341 X86_CHECK_BIOS_CORRUPTION=y to allow the kernel to check typical
1342 corruption patterns.
Ingo Molnarfc381512008-09-16 10:07:34 +02001343
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001344 Say Y if unsure.
Ingo Molnarfc381512008-09-16 10:07:34 +02001345
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001346config MATH_EMULATION
1347 bool
1348 prompt "Math emulation" if X86_32
1349 ---help---
1350 Linux can emulate a math coprocessor (used for floating point
1351 operations) if you don't have one. 486DX and Pentium processors have
1352 a math coprocessor built in, 486SX and 386 do not, unless you added
1353 a 487DX or 387, respectively. (The messages during boot time can
1354 give you some hints here ["man dmesg"].) Everyone needs either a
1355 coprocessor or this emulation.
1356
1357 If you don't have a math coprocessor, you need to say Y here; if you
1358 say Y here even though you have a coprocessor, the coprocessor will
1359 be used nevertheless. (This behavior can be changed with the kernel
1360 command line option "no387", which comes handy if your coprocessor
1361 is broken. Try "man bootparam" or see the documentation of your boot
1362 loader (lilo or loadlin) about how to pass options to the kernel at
1363 boot time.) This means that it is a good idea to say Y here if you
1364 intend to use this kernel on different machines.
1365
1366 More information about the internals of the Linux math coprocessor
1367 emulation can be found in <file:arch/x86/math-emu/README>.
1368
1369 If you are not sure, say Y; apart from resulting in a 66 KB bigger
1370 kernel, it won't hurt.
1371
1372config MTRR
Jan Beulich6fc108a2010-04-21 15:23:44 +01001373 def_bool y
Arjan van de Venc03cb312009-10-11 10:33:02 -07001374 prompt "MTRR (Memory Type Range Register) support" if EMBEDDED
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001375 ---help---
1376 On Intel P6 family processors (Pentium Pro, Pentium II and later)
1377 the Memory Type Range Registers (MTRRs) may be used to control
1378 processor access to memory ranges. This is most useful if you have
1379 a video (VGA) card on a PCI or AGP bus. Enabling write-combining
1380 allows bus write transfers to be combined into a larger transfer
1381 before bursting over the PCI/AGP bus. This can increase performance
1382 of image write operations 2.5 times or more. Saying Y here creates a
1383 /proc/mtrr file which may be used to manipulate your processor's
1384 MTRRs. Typically the X server should use this.
1385
1386 This code has a reasonably generic interface so that similar
1387 control registers on other processors can be easily supported
1388 as well:
1389
1390 The Cyrix 6x86, 6x86MX and M II processors have Address Range
1391 Registers (ARRs) which provide a similar functionality to MTRRs. For
1392 these, the ARRs are used to emulate the MTRRs.
1393 The AMD K6-2 (stepping 8 and above) and K6-3 processors have two
1394 MTRRs. The Centaur C6 (WinChip) has 8 MCRs, allowing
1395 write-combining. All of these processors are supported by this code
1396 and it makes sense to say Y here if you have one of them.
1397
1398 Saying Y here also fixes a problem with buggy SMP BIOSes which only
1399 set the MTRRs for the boot CPU and not for the secondary CPUs. This
1400 can lead to all sorts of problems, so it's good to say Y here.
1401
1402 You can safely say Y even if your machine doesn't have MTRRs, you'll
1403 just add about 9 KB to your kernel.
1404
Randy Dunlap7225e752008-07-26 17:54:22 -07001405 See <file:Documentation/x86/mtrr.txt> for more information.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001406
Yinghai Lu95ffa242008-04-29 03:52:33 -07001407config MTRR_SANITIZER
Yinghai Lu2ffb3502008-09-30 16:29:40 -07001408 def_bool y
Yinghai Lu95ffa242008-04-29 03:52:33 -07001409 prompt "MTRR cleanup support"
1410 depends on MTRR
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001411 ---help---
Thomas Gleixneraba37282008-07-15 14:48:48 +02001412 Convert MTRR layout from continuous to discrete, so X drivers can
1413 add writeback entries.
Yinghai Lu95ffa242008-04-29 03:52:33 -07001414
Thomas Gleixneraba37282008-07-15 14:48:48 +02001415 Can be disabled with disable_mtrr_cleanup on the kernel command line.
Matt LaPlante692105b2009-01-26 11:12:25 +01001416 The largest mtrr entry size for a continuous block can be set with
Thomas Gleixneraba37282008-07-15 14:48:48 +02001417 mtrr_chunk_size.
Yinghai Lu95ffa242008-04-29 03:52:33 -07001418
Yinghai Lu2ffb3502008-09-30 16:29:40 -07001419 If unsure, say Y.
Yinghai Lu95ffa242008-04-29 03:52:33 -07001420
1421config MTRR_SANITIZER_ENABLE_DEFAULT
Yinghai Luf5098d62008-04-29 20:25:58 -07001422 int "MTRR cleanup enable value (0-1)"
1423 range 0 1
1424 default "0"
Yinghai Lu95ffa242008-04-29 03:52:33 -07001425 depends on MTRR_SANITIZER
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001426 ---help---
Yinghai Luf5098d62008-04-29 20:25:58 -07001427 Enable mtrr cleanup default value
Yinghai Lu95ffa242008-04-29 03:52:33 -07001428
Yinghai Lu12031a62008-05-02 02:40:22 -07001429config MTRR_SANITIZER_SPARE_REG_NR_DEFAULT
1430 int "MTRR cleanup spare reg num (0-7)"
1431 range 0 7
1432 default "1"
1433 depends on MTRR_SANITIZER
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001434 ---help---
Yinghai Lu12031a62008-05-02 02:40:22 -07001435 mtrr cleanup spare entries default, it can be changed via
Thomas Gleixneraba37282008-07-15 14:48:48 +02001436 mtrr_spare_reg_nr=N on the kernel command line.
Yinghai Lu12031a62008-05-02 02:40:22 -07001437
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001438config X86_PAT
Jan Beulich6fc108a2010-04-21 15:23:44 +01001439 def_bool y
Arjan van de Venc03cb312009-10-11 10:33:02 -07001440 prompt "x86 PAT support" if EMBEDDED
Ingo Molnar2a8a2712008-04-26 10:26:52 +02001441 depends on MTRR
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001442 ---help---
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001443 Use PAT attributes to setup page level cache control.
Venki Pallipadi042b78e2008-03-24 14:22:35 -07001444
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001445 PATs are the modern equivalents of MTRRs and are much more
1446 flexible than MTRRs.
1447
1448 Say N here if you see bootup problems (boot crash, boot hang,
Venki Pallipadi042b78e2008-03-24 14:22:35 -07001449 spontaneous reboots) or a non-working video driver.
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001450
1451 If unsure, say Y.
1452
Venkatesh Pallipadi46cf98c2009-07-10 09:57:37 -07001453config ARCH_USES_PG_UNCACHED
1454 def_bool y
1455 depends on X86_PAT
1456
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001457config EFI
Jan Beulich9ba16082008-10-15 22:01:38 -07001458 bool "EFI runtime service support"
Huang, Ying5b836832008-01-30 13:31:19 +01001459 depends on ACPI
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001460 ---help---
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001461 This enables the kernel to use EFI runtime services that are
1462 available (such as the EFI variable services).
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001463
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001464 This option is only useful on systems that have EFI firmware.
1465 In addition, you should use the latest ELILO loader available
1466 at <http://elilo.sourceforge.net> in order to take advantage
1467 of EFI runtime services. However, even with this option, the
1468 resultant kernel should continue to boot on existing non-EFI
1469 platforms.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001470
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001471config SECCOMP
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001472 def_bool y
1473 prompt "Enable seccomp to safely compute untrusted bytecode"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001474 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001475 This kernel feature is useful for number crunching applications
1476 that may need to compute untrusted bytecode during their
1477 execution. By using pipes or other transports made available to
1478 the process as file descriptors supporting the read/write
1479 syscalls, it's possible to isolate those applications in
1480 their own address space using seccomp. Once seccomp is
Alexey Dobriyan9c0bbee2008-09-09 11:01:31 +04001481 enabled via prctl(PR_SET_SECCOMP), it cannot be disabled
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001482 and the task is only allowed to execute a few safe syscalls
1483 defined by each seccomp mode.
1484
1485 If unsure, say Y. Only embedded should say N here.
1486
1487config CC_STACKPROTECTOR
1488 bool "Enable -fstack-protector buffer overflow detection (EXPERIMENTAL)"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001489 ---help---
1490 This option turns on the -fstack-protector GCC feature. This
Ingo Molnar113c5412008-02-14 10:36:03 +01001491 feature puts, at the beginning of functions, a canary value on
1492 the stack just before the return address, and validates
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001493 the value just before actually returning. Stack based buffer
1494 overflows (that need to overwrite this return address) now also
1495 overwrite the canary, which gets detected and the attack is then
1496 neutralized via a kernel panic.
1497
1498 This feature requires gcc version 4.2 or above, or a distribution
1499 gcc with the feature backported. Older versions are automatically
Ingo Molnar113c5412008-02-14 10:36:03 +01001500 detected and for those versions, this configuration option is
1501 ignored. (and a warning is printed during bootup)
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001502
1503source kernel/Kconfig.hz
1504
1505config KEXEC
1506 bool "kexec system call"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001507 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001508 kexec is a system call that implements the ability to shutdown your
1509 current kernel, and to start another kernel. It is like a reboot
1510 but it is independent of the system firmware. And like a reboot
1511 you can start any kernel with it, not just Linux.
1512
1513 The name comes from the similarity to the exec system call.
1514
1515 It is an ongoing process to be certain the hardware in a machine
1516 is properly shutdown, so do not be surprised if this code does not
1517 initially work for you. It may help to enable device hotplugging
1518 support. As of this writing the exact hardware interface is
1519 strongly in flux, so no good recommendation can be made.
1520
1521config CRASH_DUMP
Pavel Machek04b69442008-08-14 17:16:50 +02001522 bool "kernel crash dumps"
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001523 depends on X86_64 || (X86_32 && HIGHMEM)
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001524 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001525 Generate crash dump after being started by kexec.
1526 This should be normally only set in special crash dump kernels
1527 which are loaded in the main kernel with kexec-tools into
1528 a specially reserved region and then later executed after
1529 a crash by kdump/kexec. The crash dump kernel must be compiled
1530 to a memory address not used by the main kernel or BIOS using
1531 PHYSICAL_START, or it must be built as a relocatable image
1532 (CONFIG_RELOCATABLE=y).
1533 For more details see Documentation/kdump/kdump.txt
1534
Huang Ying3ab83522008-07-25 19:45:07 -07001535config KEXEC_JUMP
1536 bool "kexec jump (EXPERIMENTAL)"
1537 depends on EXPERIMENTAL
Huang Yingfee7b0d2009-03-10 10:57:16 +08001538 depends on KEXEC && HIBERNATION
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001539 ---help---
Huang Ying89081d12008-07-25 19:45:10 -07001540 Jump between original kernel and kexeced kernel and invoke
1541 code in physical address mode via KEXEC
Huang Ying3ab83522008-07-25 19:45:07 -07001542
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001543config PHYSICAL_START
1544 hex "Physical address where the kernel is loaded" if (EMBEDDED || CRASH_DUMP)
H. Peter Anvinceefccc2009-05-11 16:12:16 -07001545 default "0x1000000"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001546 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001547 This gives the physical address where the kernel is loaded.
1548
1549 If kernel is a not relocatable (CONFIG_RELOCATABLE=n) then
1550 bzImage will decompress itself to above physical address and
1551 run from there. Otherwise, bzImage will run from the address where
1552 it has been loaded by the boot loader and will ignore above physical
1553 address.
1554
1555 In normal kdump cases one does not have to set/change this option
1556 as now bzImage can be compiled as a completely relocatable image
1557 (CONFIG_RELOCATABLE=y) and be used to load and run from a different
1558 address. This option is mainly useful for the folks who don't want
1559 to use a bzImage for capturing the crash dump and want to use a
1560 vmlinux instead. vmlinux is not relocatable hence a kernel needs
1561 to be specifically compiled to run from a specific memory area
1562 (normally a reserved region) and this option comes handy.
1563
H. Peter Anvinceefccc2009-05-11 16:12:16 -07001564 So if you are using bzImage for capturing the crash dump,
1565 leave the value here unchanged to 0x1000000 and set
1566 CONFIG_RELOCATABLE=y. Otherwise if you plan to use vmlinux
1567 for capturing the crash dump change this value to start of
1568 the reserved region. In other words, it can be set based on
1569 the "X" value as specified in the "crashkernel=YM@XM"
1570 command line boot parameter passed to the panic-ed
1571 kernel. Please take a look at Documentation/kdump/kdump.txt
1572 for more details about crash dumps.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001573
1574 Usage of bzImage for capturing the crash dump is recommended as
1575 one does not have to build two kernels. Same kernel can be used
1576 as production kernel and capture kernel. Above option should have
1577 gone away after relocatable bzImage support is introduced. But it
1578 is present because there are users out there who continue to use
1579 vmlinux for dump capture. This option should go away down the
1580 line.
1581
1582 Don't change this unless you know what you are doing.
1583
1584config RELOCATABLE
H. Peter Anvin26717802009-05-07 14:19:34 -07001585 bool "Build a relocatable kernel"
1586 default y
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001587 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001588 This builds a kernel image that retains relocation information
1589 so it can be loaded someplace besides the default 1MB.
1590 The relocations tend to make the kernel binary about 10% larger,
1591 but are discarded at runtime.
1592
1593 One use is for the kexec on panic case where the recovery kernel
1594 must live at a different physical address than the primary
1595 kernel.
1596
1597 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
1598 it has been loaded at and the compile time physical address
1599 (CONFIG_PHYSICAL_START) is ignored.
1600
H. Peter Anvin845adf72009-05-05 21:20:51 -07001601# Relocation on x86-32 needs some additional build support
1602config X86_NEED_RELOCS
1603 def_bool y
1604 depends on X86_32 && RELOCATABLE
1605
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001606config PHYSICAL_ALIGN
Jan Beulich6fc108a2010-04-21 15:23:44 +01001607 hex "Alignment value to which kernel should be aligned" if X86_32
H. Peter Anvinceefccc2009-05-11 16:12:16 -07001608 default "0x1000000"
1609 range 0x2000 0x1000000
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001610 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001611 This value puts the alignment restrictions on physical address
1612 where kernel is loaded and run from. Kernel is compiled for an
1613 address which meets above alignment restriction.
1614
1615 If bootloader loads the kernel at a non-aligned address and
1616 CONFIG_RELOCATABLE is set, kernel will move itself to nearest
1617 address aligned to above value and run from there.
1618
1619 If bootloader loads the kernel at a non-aligned address and
1620 CONFIG_RELOCATABLE is not set, kernel will ignore the run time
1621 load address and decompress itself to the address it has been
1622 compiled for and run from there. The address for which kernel is
1623 compiled already meets above alignment restrictions. Hence the
1624 end result is that kernel runs from a physical address meeting
1625 above alignment restrictions.
1626
1627 Don't change this unless you know what you are doing.
1628
1629config HOTPLUG_CPU
Dimitri Sivanich7c13e6a2008-08-11 10:46:46 -05001630 bool "Support for hot-pluggable CPUs"
Ingo Molnar4b19ed912009-01-27 17:47:24 +01001631 depends on SMP && HOTPLUG
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001632 ---help---
Dimitri Sivanich7c13e6a2008-08-11 10:46:46 -05001633 Say Y here to allow turning CPUs off and on. CPUs can be
1634 controlled through /sys/devices/system/cpu.
1635 ( Note: power management support will enable this option
1636 automatically on SMP systems. )
1637 Say N if you want to disable CPU hotplug.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001638
1639config COMPAT_VDSO
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001640 def_bool y
1641 prompt "Compat VDSO support"
Roland McGrathaf65d642008-01-30 13:30:43 +01001642 depends on X86_32 || IA32_EMULATION
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001643 ---help---
Roland McGrathaf65d642008-01-30 13:30:43 +01001644 Map the 32-bit VDSO to the predictable old-style address too.
Randy Dunlape84446d2009-11-10 15:46:52 -08001645
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001646 Say N here if you are running a sufficiently recent glibc
1647 version (2.3.3 or later), to remove the high-mapped
1648 VDSO mapping and to exclusively use the randomized VDSO.
1649
1650 If unsure, say Y.
1651
Tim Bird516cbf32008-08-12 12:52:36 -07001652config CMDLINE_BOOL
1653 bool "Built-in kernel command line"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001654 ---help---
Tim Bird516cbf32008-08-12 12:52:36 -07001655 Allow for specifying boot arguments to the kernel at
1656 build time. On some systems (e.g. embedded ones), it is
1657 necessary or convenient to provide some or all of the
1658 kernel boot arguments with the kernel itself (that is,
1659 to not rely on the boot loader to provide them.)
1660
1661 To compile command line arguments into the kernel,
1662 set this option to 'Y', then fill in the
1663 the boot arguments in CONFIG_CMDLINE.
1664
1665 Systems with fully functional boot loaders (i.e. non-embedded)
1666 should leave this option set to 'N'.
1667
1668config CMDLINE
1669 string "Built-in kernel command string"
1670 depends on CMDLINE_BOOL
1671 default ""
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001672 ---help---
Tim Bird516cbf32008-08-12 12:52:36 -07001673 Enter arguments here that should be compiled into the kernel
1674 image and used at boot time. If the boot loader provides a
1675 command line at boot time, it is appended to this string to
1676 form the full kernel command line, when the system boots.
1677
1678 However, you can use the CONFIG_CMDLINE_OVERRIDE option to
1679 change this behavior.
1680
1681 In most cases, the command line (whether built-in or provided
1682 by the boot loader) should specify the device for the root
1683 file system.
1684
1685config CMDLINE_OVERRIDE
1686 bool "Built-in command line overrides boot loader arguments"
Tim Bird516cbf32008-08-12 12:52:36 -07001687 depends on CMDLINE_BOOL
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001688 ---help---
Tim Bird516cbf32008-08-12 12:52:36 -07001689 Set this option to 'Y' to have the kernel ignore the boot loader
1690 command line, and use ONLY the built-in command line.
1691
1692 This is used to work around broken boot loaders. This should
1693 be set to 'N' under normal conditions.
1694
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001695endmenu
1696
1697config ARCH_ENABLE_MEMORY_HOTPLUG
1698 def_bool y
1699 depends on X86_64 || (X86_32 && HIGHMEM)
1700
Gary Hade35551052008-10-31 10:52:03 -07001701config ARCH_ENABLE_MEMORY_HOTREMOVE
1702 def_bool y
1703 depends on MEMORY_HOTPLUG
1704
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001705config HAVE_ARCH_EARLY_PFN_TO_NID
1706 def_bool X86_64
1707 depends on NUMA
1708
Bjorn Helgaasda85f862008-11-05 13:37:27 -06001709menu "Power management and ACPI options"
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001710
1711config ARCH_HIBERNATION_HEADER
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001712 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001713 depends on X86_64 && HIBERNATION
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001714
1715source "kernel/power/Kconfig"
1716
1717source "drivers/acpi/Kconfig"
1718
Feng Tangefafc8b2009-08-14 15:23:29 -04001719source "drivers/sfi/Kconfig"
1720
Andi Kleena6b68072008-01-30 13:32:49 +01001721config X86_APM_BOOT
Jan Beulich6fc108a2010-04-21 15:23:44 +01001722 def_bool y
Andi Kleena6b68072008-01-30 13:32:49 +01001723 depends on APM || APM_MODULE
1724
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001725menuconfig APM
1726 tristate "APM (Advanced Power Management) BIOS support"
Ingo Molnarefefa6f2008-07-10 16:09:50 +02001727 depends on X86_32 && PM_SLEEP
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001728 ---help---
1729 APM is a BIOS specification for saving power using several different
1730 techniques. This is mostly useful for battery powered laptops with
1731 APM compliant BIOSes. If you say Y here, the system time will be
1732 reset after a RESUME operation, the /proc/apm device will provide
1733 battery status information, and user-space programs will receive
1734 notification of APM "events" (e.g. battery status change).
1735
1736 If you select "Y" here, you can disable actual use of the APM
1737 BIOS by passing the "apm=off" option to the kernel at boot time.
1738
1739 Note that the APM support is almost completely disabled for
1740 machines with more than one CPU.
1741
1742 In order to use APM, you will need supporting software. For location
Randy Dunlap53471122008-03-12 18:10:51 -04001743 and more information, read <file:Documentation/power/pm.txt> and the
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001744 Battery Powered Linux mini-HOWTO, available from
1745 <http://www.tldp.org/docs.html#howto>.
1746
1747 This driver does not spin down disk drives (see the hdparm(8)
1748 manpage ("man 8 hdparm") for that), and it doesn't turn off
1749 VESA-compliant "green" monitors.
1750
1751 This driver does not support the TI 4000M TravelMate and the ACER
1752 486/DX4/75 because they don't have compliant BIOSes. Many "green"
1753 desktop machines also don't have compliant BIOSes, and this driver
1754 may cause those machines to panic during the boot phase.
1755
1756 Generally, if you don't have a battery in your machine, there isn't
1757 much point in using this driver and you should say N. If you get
1758 random kernel OOPSes or reboots that don't seem to be related to
1759 anything, try disabling/enabling this option (or disabling/enabling
1760 APM in your BIOS).
1761
1762 Some other things you should try when experiencing seemingly random,
1763 "weird" problems:
1764
1765 1) make sure that you have enough swap space and that it is
1766 enabled.
1767 2) pass the "no-hlt" option to the kernel
1768 3) switch on floating point emulation in the kernel and pass
1769 the "no387" option to the kernel
1770 4) pass the "floppy=nodma" option to the kernel
1771 5) pass the "mem=4M" option to the kernel (thereby disabling
1772 all but the first 4 MB of RAM)
1773 6) make sure that the CPU is not over clocked.
1774 7) read the sig11 FAQ at <http://www.bitwizard.nl/sig11/>
1775 8) disable the cache from your BIOS settings
1776 9) install a fan for the video card or exchange video RAM
1777 10) install a better fan for the CPU
1778 11) exchange RAM chips
1779 12) exchange the motherboard.
1780
1781 To compile this driver as a module, choose M here: the
1782 module will be called apm.
1783
1784if APM
1785
1786config APM_IGNORE_USER_SUSPEND
1787 bool "Ignore USER SUSPEND"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001788 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001789 This option will ignore USER SUSPEND requests. On machines with a
1790 compliant APM BIOS, you want to say N. However, on the NEC Versa M
1791 series notebooks, it is necessary to say Y because of a BIOS bug.
1792
1793config APM_DO_ENABLE
1794 bool "Enable PM at boot time"
1795 ---help---
1796 Enable APM features at boot time. From page 36 of the APM BIOS
1797 specification: "When disabled, the APM BIOS does not automatically
1798 power manage devices, enter the Standby State, enter the Suspend
1799 State, or take power saving steps in response to CPU Idle calls."
1800 This driver will make CPU Idle calls when Linux is idle (unless this
1801 feature is turned off -- see "Do CPU IDLE calls", below). This
1802 should always save battery power, but more complicated APM features
1803 will be dependent on your BIOS implementation. You may need to turn
1804 this option off if your computer hangs at boot time when using APM
1805 support, or if it beeps continuously instead of suspending. Turn
1806 this off if you have a NEC UltraLite Versa 33/C or a Toshiba
1807 T400CDT. This is off by default since most machines do fine without
1808 this feature.
1809
1810config APM_CPU_IDLE
1811 bool "Make CPU Idle calls when idle"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001812 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001813 Enable calls to APM CPU Idle/CPU Busy inside the kernel's idle loop.
1814 On some machines, this can activate improved power savings, such as
1815 a slowed CPU clock rate, when the machine is idle. These idle calls
1816 are made after the idle loop has run for some length of time (e.g.,
1817 333 mS). On some machines, this will cause a hang at boot time or
1818 whenever the CPU becomes idle. (On machines with more than one CPU,
1819 this option does nothing.)
1820
1821config APM_DISPLAY_BLANK
1822 bool "Enable console blanking using APM"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001823 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001824 Enable console blanking using the APM. Some laptops can use this to
1825 turn off the LCD backlight when the screen blanker of the Linux
1826 virtual console blanks the screen. Note that this is only used by
1827 the virtual console screen blanker, and won't turn off the backlight
1828 when using the X Window system. This also doesn't have anything to
1829 do with your VESA-compliant power-saving monitor. Further, this
1830 option doesn't work for all laptops -- it might not turn off your
1831 backlight at all, or it might print a lot of errors to the console,
1832 especially if you are using gpm.
1833
1834config APM_ALLOW_INTS
1835 bool "Allow interrupts during APM BIOS calls"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001836 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001837 Normally we disable external interrupts while we are making calls to
1838 the APM BIOS as a measure to lessen the effects of a badly behaving
1839 BIOS implementation. The BIOS should reenable interrupts if it
1840 needs to. Unfortunately, some BIOSes do not -- especially those in
1841 many of the newer IBM Thinkpads. If you experience hangs when you
1842 suspend, try setting this to Y. Otherwise, say N.
1843
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001844endif # APM
1845
1846source "arch/x86/kernel/cpu/cpufreq/Kconfig"
1847
1848source "drivers/cpuidle/Kconfig"
1849
Andy Henroid27471fd2008-10-09 11:45:22 -07001850source "drivers/idle/Kconfig"
1851
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001852endmenu
1853
1854
1855menu "Bus options (PCI etc.)"
1856
1857config PCI
Ingo Molnar1ac97012008-05-19 14:10:14 +02001858 bool "PCI support"
Adrian Bunk1c858082008-01-30 13:32:32 +01001859 default y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001860 select ARCH_SUPPORTS_MSI if (X86_LOCAL_APIC && X86_IO_APIC)
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001861 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001862 Find out whether you have a PCI motherboard. PCI is the name of a
1863 bus system, i.e. the way the CPU talks to the other stuff inside
1864 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
1865 VESA. If you have PCI, say Y, otherwise N.
1866
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001867choice
1868 prompt "PCI access mode"
Ingo Molnarefefa6f2008-07-10 16:09:50 +02001869 depends on X86_32 && PCI
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001870 default PCI_GOANY
1871 ---help---
1872 On PCI systems, the BIOS can be used to detect the PCI devices and
1873 determine their configuration. However, some old PCI motherboards
1874 have BIOS bugs and may crash if this is done. Also, some embedded
1875 PCI-based systems don't have any BIOS at all. Linux can also try to
1876 detect the PCI hardware directly without using the BIOS.
1877
1878 With this option, you can specify how Linux should detect the
1879 PCI devices. If you choose "BIOS", the BIOS will be used,
1880 if you choose "Direct", the BIOS won't be used, and if you
1881 choose "MMConfig", then PCI Express MMCONFIG will be used.
1882 If you choose "Any", the kernel will try MMCONFIG, then the
1883 direct access method and falls back to the BIOS if that doesn't
1884 work. If unsure, go with the default, which is "Any".
1885
1886config PCI_GOBIOS
1887 bool "BIOS"
1888
1889config PCI_GOMMCONFIG
1890 bool "MMConfig"
1891
1892config PCI_GODIRECT
1893 bool "Direct"
1894
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07001895config PCI_GOOLPC
1896 bool "OLPC"
1897 depends on OLPC
1898
Andres Salomon2bdd1b02008-06-05 14:14:41 -07001899config PCI_GOANY
1900 bool "Any"
1901
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001902endchoice
1903
1904config PCI_BIOS
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001905 def_bool y
Ingo Molnarefefa6f2008-07-10 16:09:50 +02001906 depends on X86_32 && PCI && (PCI_GOBIOS || PCI_GOANY)
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001907
1908# x86-64 doesn't support PCI BIOS access from long mode so always go direct.
1909config PCI_DIRECT
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001910 def_bool y
Ingo Molnarefefa6f2008-07-10 16:09:50 +02001911 depends on PCI && (X86_64 || (PCI_GODIRECT || PCI_GOANY || PCI_GOOLPC))
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001912
1913config PCI_MMCONFIG
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001914 def_bool y
Feng Tang5f0db7a2009-08-14 15:37:50 -04001915 depends on X86_32 && PCI && (ACPI || SFI) && (PCI_GOMMCONFIG || PCI_GOANY)
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001916
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07001917config PCI_OLPC
Andres Salomon2bdd1b02008-06-05 14:14:41 -07001918 def_bool y
1919 depends on PCI && OLPC && (PCI_GOOLPC || PCI_GOANY)
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07001920
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001921config PCI_DOMAINS
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001922 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001923 depends on PCI
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001924
1925config PCI_MMCONFIG
1926 bool "Support mmconfig PCI config space access"
1927 depends on X86_64 && PCI && ACPI
1928
Ira W. Snyder3f6ea842010-04-01 11:43:30 -07001929config PCI_CNB20LE_QUIRK
1930 bool "Read CNB20LE Host Bridge Windows"
1931 depends on PCI
1932 help
1933 Read the PCI windows out of the CNB20LE host bridge. This allows
1934 PCI hotplug to work on systems with the CNB20LE chipset which do
1935 not have ACPI.
1936
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001937config DMAR
1938 bool "Support for DMA Remapping Devices (EXPERIMENTAL)"
David Woodhouse4cf2e752009-02-11 17:23:43 +00001939 depends on PCI_MSI && ACPI && EXPERIMENTAL
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001940 help
1941 DMA remapping (DMAR) devices support enables independent address
1942 translations for Direct Memory Access (DMA) from devices.
1943 These DMA remapping devices are reported via ACPI tables
1944 and include PCI device scope covered by these DMA
1945 remapping devices.
1946
Kyle McMartin0cd5c3c2009-02-04 14:29:19 -08001947config DMAR_DEFAULT_ON
Kyle McMartinf6be37f2009-02-26 12:57:56 -05001948 def_bool y
Kyle McMartin0cd5c3c2009-02-04 14:29:19 -08001949 prompt "Enable DMA Remapping Devices by default"
1950 depends on DMAR
1951 help
1952 Selecting this option will enable a DMAR device at boot time if
1953 one is found. If this option is not selected, DMAR support can
1954 be enabled by passing intel_iommu=on to the kernel. It is
1955 recommended you say N here while the DMAR code remains
1956 experimental.
1957
David Woodhouse62edf5d2009-07-04 10:59:46 +01001958config DMAR_BROKEN_GFX_WA
Jan Beulich6fc108a2010-04-21 15:23:44 +01001959 bool "Workaround broken graphics drivers (going away soon)"
David Woodhouse0c02a202009-09-19 09:37:23 -07001960 depends on DMAR && BROKEN
David Woodhouse62edf5d2009-07-04 10:59:46 +01001961 ---help---
1962 Current Graphics drivers tend to use physical address
1963 for DMA and avoid using DMA APIs. Setting this config
1964 option permits the IOMMU driver to set a unity map for
1965 all the OS-visible memory. Hence the driver can continue
1966 to use physical addresses for DMA, at least until this
1967 option is removed in the 2.6.32 kernel.
1968
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001969config DMAR_FLOPPY_WA
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001970 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001971 depends on DMAR
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001972 ---help---
David Woodhousec7ab48d2009-06-26 19:10:36 +01001973 Floppy disk drivers are known to bypass DMA API calls
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001974 thereby failing to work when IOMMU is enabled. This
1975 workaround will setup a 1:1 mapping for the first
David Woodhousec7ab48d2009-06-26 19:10:36 +01001976 16MiB to make floppy (an ISA device) work.
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001977
Suresh Siddha9fa8c482008-07-10 11:17:00 -07001978config INTR_REMAP
1979 bool "Support for Interrupt Remapping (EXPERIMENTAL)"
1980 depends on X86_64 && X86_IO_APIC && PCI_MSI && ACPI && EXPERIMENTAL
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001981 ---help---
1982 Supports Interrupt remapping for IO-APIC and MSI devices.
1983 To use x2apic mode in the CPU's which support x2APIC enhancements or
1984 to support platforms with CPU's having > 8 bit APIC ID, say Y.
Suresh Siddha9fa8c482008-07-10 11:17:00 -07001985
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001986source "drivers/pci/pcie/Kconfig"
1987
1988source "drivers/pci/Kconfig"
1989
1990# x86_64 have no ISA slots, but do have ISA-style DMA.
1991config ISA_DMA_API
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001992 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001993
1994if X86_32
1995
1996config ISA
1997 bool "ISA support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001998 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001999 Find out whether you have ISA slots on your motherboard. ISA is the
2000 name of a bus system, i.e. the way the CPU talks to the other stuff
2001 inside your box. Other bus systems are PCI, EISA, MicroChannel
2002 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
2003 newer boards don't support it. If you have ISA, say Y, otherwise N.
2004
2005config EISA
2006 bool "EISA support"
2007 depends on ISA
2008 ---help---
2009 The Extended Industry Standard Architecture (EISA) bus was
2010 developed as an open alternative to the IBM MicroChannel bus.
2011
2012 The EISA bus provided some of the features of the IBM MicroChannel
2013 bus while maintaining backward compatibility with cards made for
2014 the older ISA bus. The EISA bus saw limited use between 1988 and
2015 1995 when it was made obsolete by the PCI bus.
2016
2017 Say Y here if you are building a kernel for an EISA-based machine.
2018
2019 Otherwise, say N.
2020
2021source "drivers/eisa/Kconfig"
2022
2023config MCA
Ingo Molnar72ee6eb2009-01-27 16:57:49 +01002024 bool "MCA support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002025 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002026 MicroChannel Architecture is found in some IBM PS/2 machines and
2027 laptops. It is a bus system similar to PCI or ISA. See
2028 <file:Documentation/mca.txt> (and especially the web page given
2029 there) before attempting to build an MCA bus kernel.
2030
2031source "drivers/mca/Kconfig"
2032
2033config SCx200
2034 tristate "NatSemi SCx200 support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002035 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002036 This provides basic support for National Semiconductor's
2037 (now AMD's) Geode processors. The driver probes for the
2038 PCI-IDs of several on-chip devices, so its a good dependency
2039 for other scx200_* drivers.
2040
2041 If compiled as a module, the driver is named scx200.
2042
2043config SCx200HR_TIMER
2044 tristate "NatSemi SCx200 27MHz High-Resolution Timer Support"
2045 depends on SCx200 && GENERIC_TIME
2046 default y
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002047 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002048 This driver provides a clocksource built upon the on-chip
2049 27MHz high-resolution timer. Its also a workaround for
2050 NSC Geode SC-1100's buggy TSC, which loses time when the
2051 processor goes idle (as is done by the scheduler). The
2052 other workaround is idle=poll boot option.
2053
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07002054config OLPC
2055 bool "One Laptop Per Child support"
Andres Salomon3c554942009-12-14 18:00:36 -08002056 select GPIOLIB
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002057 ---help---
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07002058 Add support for detecting the unique features of the OLPC
2059 XO hardware.
2060
Sam Ravnborgbc0120f2007-11-06 23:10:39 +01002061endif # X86_32
2062
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002063config K8_NB
2064 def_bool y
Borislav Petkov0e152cd2010-03-12 15:43:03 +01002065 depends on CPU_SUP_AMD && PCI
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002066
2067source "drivers/pcmcia/Kconfig"
2068
2069source "drivers/pci/hotplug/Kconfig"
2070
2071endmenu
2072
2073
2074menu "Executable file formats / Emulations"
2075
2076source "fs/Kconfig.binfmt"
2077
2078config IA32_EMULATION
2079 bool "IA32 Emulation"
2080 depends on X86_64
Roland McGratha97f52e2008-01-30 13:31:55 +01002081 select COMPAT_BINFMT_ELF
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002082 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002083 Include code to run 32-bit programs under a 64-bit kernel. You should
2084 likely turn this on, unless you're 100% sure that you don't have any
2085 32-bit programs left.
2086
2087config IA32_AOUT
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002088 tristate "IA32 a.out support"
2089 depends on IA32_EMULATION
2090 ---help---
2091 Support old a.out binaries in the 32bit emulation.
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002092
2093config COMPAT
Harvey Harrison3c2362e2008-01-30 13:31:03 +01002094 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002095 depends on IA32_EMULATION
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002096
2097config COMPAT_FOR_U64_ALIGNMENT
2098 def_bool COMPAT
2099 depends on X86_64
2100
2101config SYSVIPC_COMPAT
Harvey Harrison3c2362e2008-01-30 13:31:03 +01002102 def_bool y
Alexey Dobriyanb8992192008-09-14 13:44:41 +04002103 depends on COMPAT && SYSVIPC
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002104
2105endmenu
2106
2107
Keith Packarde5beae12008-11-03 18:21:45 +01002108config HAVE_ATOMIC_IOMAP
2109 def_bool y
2110 depends on X86_32
2111
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002112source "net/Kconfig"
2113
2114source "drivers/Kconfig"
2115
2116source "drivers/firmware/Kconfig"
2117
2118source "fs/Kconfig"
2119
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002120source "arch/x86/Kconfig.debug"
2121
2122source "security/Kconfig"
2123
2124source "crypto/Kconfig"
2125
Avi Kivityedf88412007-12-16 11:02:48 +02002126source "arch/x86/kvm/Kconfig"
2127
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002128source "lib/Kconfig"