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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 Carstensf850c302010-02-10 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
Frederic Weisbeckerc01d4322010-05-15 22:57:48 +020058 select HAVE_PERF_EVENTS_NMI
Frederic Weisbecker99e8c5a2009-12-17 01:33:54 +010059 select ANON_INODES
Pekka Enberg0a4af3b2009-02-26 21:38:56 +020060 select HAVE_ARCH_KMEMCHECK
Avi Kivity7c68af62009-09-19 09:40:22 +030061 select HAVE_USER_RETURN_NOTIFIER
Balbir Singh7d8330a2008-02-10 12:46:28 +053062
Ingo Molnarba7e4d12009-06-06 13:58:12 +020063config INSTRUCTION_DECODER
64 def_bool (KPROBES || PERF_EVENTS)
65
Linus Torvalds51b26ad2009-04-26 10:12:47 -070066config OUTPUT_FORMAT
67 string
68 default "elf32-i386" if X86_32
69 default "elf64-x86-64" if X86_64
70
Sam Ravnborg73531902008-05-25 23:03:18 +020071config ARCH_DEFCONFIG
Sam Ravnborgb9b39bf2008-04-29 12:48:15 +020072 string
Sam Ravnborg73531902008-05-25 23:03:18 +020073 default "arch/x86/configs/i386_defconfig" if X86_32
74 default "arch/x86/configs/x86_64_defconfig" if X86_64
Sam Ravnborgb9b39bf2008-04-29 12:48:15 +020075
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010076config GENERIC_CMOS_UPDATE
Harvey Harrison3c2362e2008-01-30 13:31:03 +010077 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010078
79config CLOCKSOURCE_WATCHDOG
Harvey Harrison3c2362e2008-01-30 13:31:03 +010080 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010081
82config GENERIC_CLOCKEVENTS
Harvey Harrison3c2362e2008-01-30 13:31:03 +010083 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010084
85config GENERIC_CLOCKEVENTS_BROADCAST
Harvey Harrison3c2362e2008-01-30 13:31:03 +010086 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010087 depends on X86_64 || (X86_32 && X86_LOCAL_APIC)
88
89config LOCKDEP_SUPPORT
Harvey Harrison3c2362e2008-01-30 13:31:03 +010090 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010091
92config STACKTRACE_SUPPORT
Harvey Harrison3c2362e2008-01-30 13:31:03 +010093 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010094
Heiko Carstensaa7d9352008-02-01 17:45:14 +010095config HAVE_LATENCYTOP_SUPPORT
96 def_bool y
97
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010098config MMU
Harvey Harrison3c2362e2008-01-30 13:31:03 +010099 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100100
101config ZONE_DMA
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100102 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100103
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100104config SBUS
105 bool
106
FUJITA Tomonori3bc4e452010-03-10 15:23:22 -0800107config NEED_DMA_MAP_STATE
108 def_bool (X86_64 || DMAR || DMA_API_DEBUG)
109
FUJITA Tomonori18e98302010-05-26 14:44:32 -0700110config NEED_SG_DMA_LENGTH
Andrew Morton4a14d842010-05-26 14:44:33 -0700111 def_bool y
FUJITA Tomonori18e98302010-05-26 14:44:32 -0700112
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100113config GENERIC_ISA_DMA
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100114 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100115
116config GENERIC_IOMAP
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100117 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100118
119config GENERIC_BUG
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100120 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100121 depends on BUG
Jan Beulichb93a5312008-12-16 11:40:27 +0000122 select GENERIC_BUG_RELATIVE_POINTERS if X86_64
123
124config GENERIC_BUG_RELATIVE_POINTERS
125 bool
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100126
127config GENERIC_HWEIGHT
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100128 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100129
Florian Fainellia6082952008-01-30 13:33:35 +0100130config GENERIC_GPIO
Jan Beulich9ba16082008-10-15 22:01:38 -0700131 bool
Florian Fainellia6082952008-01-30 13:33:35 +0100132
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100133config ARCH_MAY_HAVE_PC_FDC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100134 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100135
Sam Ravnborg1032c0b2007-11-06 21:35:08 +0100136config RWSEM_GENERIC_SPINLOCK
137 def_bool !X86_XADD
138
139config RWSEM_XCHGADD_ALGORITHM
140 def_bool X86_XADD
141
Venki Pallipadia6869cc2008-02-08 17:05:44 -0800142config ARCH_HAS_CPU_IDLE_WAIT
143 def_bool y
144
Sam Ravnborg1032c0b2007-11-06 21:35:08 +0100145config GENERIC_CALIBRATE_DELAY
146 def_bool y
147
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100148config GENERIC_TIME_VSYSCALL
149 bool
150 default X86_64
151
venkatesh.pallipadi@intel.com9a0b8412008-01-31 17:35:06 -0800152config ARCH_HAS_CPU_RELAX
153 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100154
Venkatesh Pallipadi89cedfe2008-10-16 19:00:08 -0400155config ARCH_HAS_DEFAULT_IDLE
156 def_bool y
157
Pekka Enberg1b27d052008-04-28 02:12:22 -0700158config ARCH_HAS_CACHE_LINE_SIZE
159 def_bool y
160
Mike Travisdd5af902008-01-30 13:33:32 +0100161config HAVE_SETUP_PER_CPU_AREA
Brian Gerst89c9c4c2009-01-27 12:56:48 +0900162 def_bool y
travis@sgi.comb32ef632008-01-30 13:32:51 +0100163
Tejun Heo08fc4582009-08-14 15:00:49 +0900164config NEED_PER_CPU_EMBED_FIRST_CHUNK
165 def_bool y
166
167config NEED_PER_CPU_PAGE_FIRST_CHUNK
Tejun Heo11124412009-02-20 16:29:09 +0900168 def_bool y
169
Mike Travis9f0e8d02008-04-04 18:11:01 -0700170config HAVE_CPUMASK_OF_CPU_MAP
171 def_bool X86_64_SMP
172
Johannes Berg801e4062007-12-08 02:12:39 +0100173config ARCH_HIBERNATION_POSSIBLE
174 def_bool y
Johannes Berg801e4062007-12-08 02:12:39 +0100175
Johannes Bergf4cb5702007-12-08 02:14:00 +0100176config ARCH_SUSPEND_POSSIBLE
177 def_bool y
Johannes Bergf4cb5702007-12-08 02:14:00 +0100178
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100179config ZONE_DMA32
180 bool
181 default X86_64
182
183config ARCH_POPULATES_NODE_MAP
184 def_bool y
185
186config AUDIT_ARCH
187 bool
188 default X86_64
189
Ingo Molnar765c68b2008-04-09 11:03:37 +0200190config ARCH_SUPPORTS_OPTIMIZED_INLINING
191 def_bool y
192
Akinobu Mita6a11f752009-03-31 15:23:17 -0700193config ARCH_SUPPORTS_DEBUG_PAGEALLOC
194 def_bool y
195
Yinghai Lu580e0ad2010-02-16 18:40:35 -0800196config HAVE_EARLY_RES
197 def_bool y
198
Shane Wang69575d32009-09-01 18:25:07 -0700199config HAVE_INTEL_TXT
200 def_bool y
201 depends on EXPERIMENTAL && DMAR && ACPI
202
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100203# Use the generic interrupt handling code in kernel/irq/:
204config GENERIC_HARDIRQS
Jan Beulich6fc108a2010-04-21 15:23:44 +0100205 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100206
Thomas Gleixnerf9a36fa2009-03-13 16:37:48 +0100207config GENERIC_HARDIRQS_NO__DO_IRQ
208 def_bool y
209
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100210config GENERIC_IRQ_PROBE
Jan Beulich6fc108a2010-04-21 15:23:44 +0100211 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100212
213config GENERIC_PENDING_IRQ
Jan Beulich6fc108a2010-04-21 15:23:44 +0100214 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100215 depends on GENERIC_HARDIRQS && SMP
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100216
James Bottomley6cd10f82008-11-09 11:53:14 -0600217config USE_GENERIC_SMP_HELPERS
218 def_bool y
219 depends on SMP
220
Sam Ravnborg6b0c3d42008-01-30 13:32:27 +0100221config X86_32_SMP
222 def_bool y
223 depends on X86_32 && SMP
224
225config X86_64_SMP
226 def_bool y
227 depends on X86_64 && SMP
228
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100229config X86_HT
Jan Beulich6fc108a2010-04-21 15:23:44 +0100230 def_bool y
Adrian Bunkee0011a2007-12-04 17:19:07 +0100231 depends on SMP
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100232
233config X86_TRAMPOLINE
Jan Beulich6fc108a2010-04-21 15:23:44 +0100234 def_bool y
Ingo Molnar3e5095d2009-01-27 17:07:08 +0100235 depends on SMP || (64BIT && ACPI_SLEEP)
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100236
Tejun Heoccbeed32009-02-09 22:17:40 +0900237config X86_32_LAZY_GS
238 def_bool y
Tejun Heo60a53172009-02-09 22:17:40 +0900239 depends on X86_32 && !CC_STACKPROTECTOR
Tejun Heoccbeed32009-02-09 22:17:40 +0900240
Borislav Petkovd61931d2010-03-05 17:34:46 +0100241config ARCH_HWEIGHT_CFLAGS
242 string
243 default "-fcall-saved-ecx -fcall-saved-edx" if X86_32
244 default "-fcall-saved-rdi -fcall-saved-rsi -fcall-saved-rdx -fcall-saved-rcx -fcall-saved-r8 -fcall-saved-r9 -fcall-saved-r10 -fcall-saved-r11" if X86_64
245
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100246config KTIME_SCALAR
247 def_bool X86_32
Borislav Petkovd7c53c92010-08-19 20:10:29 +0200248
249config ARCH_CPU_PROBE_RELEASE
250 def_bool y
251 depends on HOTPLUG_CPU
252
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100253source "init/Kconfig"
Matt Helsleydc52ddc2008-10-18 20:27:21 -0700254source "kernel/Kconfig.freezer"
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100255
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100256menu "Processor type and features"
257
258source "kernel/time/Kconfig"
259
260config SMP
261 bool "Symmetric multi-processing support"
262 ---help---
263 This enables support for systems with more than one CPU. If you have
264 a system with only one CPU, like most personal computers, say N. If
265 you have a system with more than one CPU, say Y.
266
267 If you say N here, the kernel will run on single and multiprocessor
268 machines, but will use only one CPU of a multiprocessor machine. If
269 you say Y here, the kernel will run on many, but not all,
270 singleprocessor machines. On a singleprocessor machine, the kernel
271 will run faster if you say N here.
272
273 Note that if you say Y here and choose architecture "586" or
274 "Pentium" under "Processor family", the kernel will not work on 486
275 architectures. Similarly, multiprocessor kernels for the "PPro"
276 architecture may not work on all Pentium based boards.
277
278 People using multiprocessor machines who say Y here should also say
279 Y to "Enhanced Real Time Clock Support", below. The "Advanced Power
280 Management" code will be disabled if you say Y here.
281
Adrian Bunk03502fa2008-02-03 15:50:21 +0200282 See also <file:Documentation/i386/IO-APIC.txt>,
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100283 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
284 <http://www.tldp.org/docs.html#howto>.
285
286 If you don't know what to do here, say N.
287
Yinghai Lu06cd9a72009-02-16 17:29:58 -0800288config X86_X2APIC
289 bool "Support x2apic"
David Woodhousef7d7f862009-04-06 23:04:40 -0700290 depends on X86_LOCAL_APIC && X86_64 && INTR_REMAP
Yinghai Lu06cd9a72009-02-16 17:29:58 -0800291 ---help---
292 This enables x2apic support on CPUs that have this feature.
293
294 This allows 32-bit apic IDs (so it can support very large systems),
295 and accesses the local apic via MSRs not via mmio.
296
Yinghai Lu06cd9a72009-02-16 17:29:58 -0800297 If you don't know what to do here, say N.
298
Yinghai Lu0b8f1ef2008-12-05 18:58:31 -0800299config SPARSE_IRQ
300 bool "Support sparse irq numbering"
Yinghai Lu17483a12008-12-12 13:14:18 -0800301 depends on PCI_MSI || HT_IRQ
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100302 ---help---
Ingo Molnar973656f2008-12-25 16:26:47 +0100303 This enables support for sparse irqs. This is useful for distro
304 kernels that want to define a high CONFIG_NR_CPUS value but still
305 want to have low kernel memory footprint on smaller machines.
Yinghai Lu0b8f1ef2008-12-05 18:58:31 -0800306
Ingo Molnar973656f2008-12-25 16:26:47 +0100307 ( Sparse IRQs can also be beneficial on NUMA boxes, as they spread
308 out the irq_desc[] array in a more NUMA-friendly way. )
309
310 If you don't know what to do here, say N.
Yinghai Lu0b8f1ef2008-12-05 18:58:31 -0800311
Yinghai Lu15e957d2009-04-30 01:17:50 -0700312config NUMA_IRQ_DESC
313 def_bool y
Yinghai Lub9098952008-12-19 13:48:34 -0800314 depends on SPARSE_IRQ && NUMA
Yinghai Lu48a1b102008-12-11 00:15:01 -0800315
Yinghai Lu6695c852008-06-19 12:13:09 -0700316config X86_MPPARSE
Jan Beulich7a527682008-10-30 10:38:24 +0000317 bool "Enable MPS table" if ACPI
318 default y
Ingo Molnar5ab74722008-07-10 14:42:03 +0200319 depends on X86_LOCAL_APIC
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100320 ---help---
Yinghai Lu6695c852008-06-19 12:13:09 -0700321 For old smp systems that do not have proper acpi support. Newer systems
322 (esp with 64bit cpus) with acpi support, MADT and DSDT will override it
Yinghai Lu6695c852008-06-19 12:13:09 -0700323
Yinghai Lu26f7ef12009-01-29 14:19:22 -0800324config X86_BIGSMP
325 bool "Support for big SMP systems with more than 8 CPUs"
326 depends on X86_32 && SMP
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100327 ---help---
Yinghai Lu26f7ef12009-01-29 14:19:22 -0800328 This option is needed for the systems that have more than 8 CPUs
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100329
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800330if X86_32
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800331config X86_EXTENDED_PLATFORM
332 bool "Support for extended (non-PC) x86 platforms"
333 default y
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100334 ---help---
Ingo Molnar06ac8342009-01-27 18:11:43 +0100335 If you disable this option then the kernel will only support
336 standard PC platforms. (which covers the vast majority of
337 systems out there.)
338
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800339 If you enable this option then you'll be able to select support
340 for the following (non-PC) 32 bit x86 platforms:
341 AMD Elan
342 NUMAQ (IBM/Sequent)
343 RDC R-321x SoC
344 SGI 320/540 (Visual Workstation)
345 Summit/EXA (IBM x440)
346 Unisys ES7000 IA32 series
Thomas Gleixner3f4110a2009-08-29 14:54:20 +0200347 Moorestown MID devices
Ingo Molnar06ac8342009-01-27 18:11:43 +0100348
349 If you have one of these systems, or if you want to build a
350 generic distribution kernel, say Y here - otherwise say N.
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800351endif
Ingo Molnar06ac8342009-01-27 18:11:43 +0100352
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800353if X86_64
354config X86_EXTENDED_PLATFORM
355 bool "Support for extended (non-PC) x86 platforms"
356 default y
357 ---help---
358 If you disable this option then the kernel will only support
359 standard PC platforms. (which covers the vast majority of
360 systems out there.)
361
362 If you enable this option then you'll be able to select support
363 for the following (non-PC) 64 bit x86 platforms:
364 ScaleMP vSMP
365 SGI Ultraviolet
366
367 If you have one of these systems, or if you want to build a
368 generic distribution kernel, say Y here - otherwise say N.
369endif
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800370# This is an alphabetically sorted list of 64 bit extended platforms
371# Please maintain the alphabetic order if and when there are additions
Nick Piggin03b48632009-01-20 04:36:04 +0100372
Ingo Molnar6a485652009-01-27 18:29:13 +0100373config X86_VSMP
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800374 bool "ScaleMP vSMP"
Ingo Molnar6a485652009-01-27 18:29:13 +0100375 select PARAVIRT
376 depends on X86_64 && PCI
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800377 depends on X86_EXTENDED_PLATFORM
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100378 ---help---
Ingo Molnar6a485652009-01-27 18:29:13 +0100379 Support for ScaleMP vSMP systems. Say 'Y' here if this kernel is
380 supposed to run on these EM64T-based machines. Only choose this option
381 if you have one of these machines.
382
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800383config X86_UV
384 bool "SGI Ultraviolet"
385 depends on X86_64
386 depends on X86_EXTENDED_PLATFORM
Jack Steiner54c28d22009-04-03 15:39:42 -0500387 depends on NUMA
Suresh Siddha9d6c26e2009-04-20 13:02:31 -0700388 depends on X86_X2APIC
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800389 ---help---
390 This option is needed in order to support SGI Ultraviolet systems.
391 If you don't have one of these, you should say N here.
392
393# Following is an alphabetically sorted list of 32 bit extended platforms
394# Please maintain the alphabetic order if and when there are additions
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100395
396config X86_ELAN
397 bool "AMD Elan"
398 depends on X86_32
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800399 depends on X86_EXTENDED_PLATFORM
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100400 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100401 Select this for an AMD Elan processor.
402
403 Do not use this option for K6/Athlon/Opteron processors!
404
405 If unsure, choose "PC-compatible" instead.
406
Thomas Gleixner3f4110a2009-08-29 14:54:20 +0200407config X86_MRST
408 bool "Moorestown MID platform"
Jacob Pan4b2f3f72010-02-25 10:02:14 -0800409 depends on PCI
410 depends on PCI_GOANY
Thomas Gleixner3f4110a2009-08-29 14:54:20 +0200411 depends on X86_32
412 depends on X86_EXTENDED_PLATFORM
Jacob Pan4b2f3f72010-02-25 10:02:14 -0800413 depends on X86_IO_APIC
Jacob Panbb24c472009-09-02 07:37:17 -0700414 select APB_TIMER
Thomas Gleixner3f4110a2009-08-29 14:54:20 +0200415 ---help---
416 Moorestown is Intel's Low Power Intel Architecture (LPIA) based Moblin
417 Internet Device(MID) platform. Moorestown consists of two chips:
418 Lincroft (CPU core, graphics, and memory controller) and Langwell IOH.
419 Unlike standard x86 PCs, Moorestown does not have many legacy devices
420 nor standard legacy replacement devices/features. e.g. Moorestown does
421 not contain i8259, i8254, HPET, legacy BIOS, most of the io ports.
422
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800423config X86_RDC321X
424 bool "RDC R-321x SoC"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100425 depends on X86_32
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800426 depends on X86_EXTENDED_PLATFORM
427 select M486
428 select X86_REBOOTFIXUPS
429 ---help---
430 This option is needed for RDC R-321x system-on-chip, also known
431 as R-8610-(G).
432 If you don't have one of these chips, you should say N here.
433
Ingo Molnare0c7ae32009-01-27 18:43:09 +0100434config X86_32_NON_STANDARD
Ingo Molnar9c398012009-01-27 18:24:57 +0100435 bool "Support non-standard 32-bit SMP architectures"
436 depends on X86_32 && SMP
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800437 depends on X86_EXTENDED_PLATFORM
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100438 ---help---
439 This option compiles in the NUMAQ, Summit, bigsmp, ES7000, default
Yinghai Lud49c4282008-06-08 18:31:54 -0700440 subarchitectures. It is intended for a generic binary kernel.
441 if you select them all, kernel will probe it one by one. and will
442 fallback to default.
443
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800444# Alphabetically sorted list of Non standard 32 bit platforms
Yinghai Lud49c4282008-06-08 18:31:54 -0700445
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100446config X86_NUMAQ
447 bool "NUMAQ (IBM/Sequent)"
Ingo Molnare0c7ae32009-01-27 18:43:09 +0100448 depends on X86_32_NON_STANDARD
Pan, Jacob juna92d1522010-02-24 16:59:55 -0800449 depends on PCI
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100450 select NUMA
Ingo Molnar9c398012009-01-27 18:24:57 +0100451 select X86_MPPARSE
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100452 ---help---
Yinghai Lud49c4282008-06-08 18:31:54 -0700453 This option is used for getting Linux to run on a NUMAQ (IBM/Sequent)
454 NUMA multiquad box. This changes the way that processors are
455 bootstrapped, and uses Clustered Logical APIC addressing mode instead
456 of Flat Logical. You will need a new lynxer.elf file to flash your
457 firmware with - send email to <Martin.Bligh@us.ibm.com>.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100458
Linus Torvaldsd949f362009-09-26 09:35:07 -0700459config X86_SUPPORTS_MEMORY_FAILURE
Jan Beulich6fc108a2010-04-21 15:23:44 +0100460 def_bool y
Linus Torvaldsd949f362009-09-26 09:35:07 -0700461 # MCE code calls memory_failure():
462 depends on X86_MCE
463 # On 32-bit this adds too big of NODES_SHIFT and we run out of page flags:
464 depends on !X86_NUMAQ
465 # On 32-bit SPARSEMEM adds too big of SECTIONS_WIDTH:
466 depends on X86_64 || !SPARSEMEM
467 select ARCH_SUPPORTS_MEMORY_FAILURE
Linus Torvaldsd949f362009-09-26 09:35:07 -0700468
Ingo Molnar1b84e1c2008-07-10 15:55:27 +0200469config X86_VISWS
470 bool "SGI 320/540 (Visual Workstation)"
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800471 depends on X86_32 && PCI && X86_MPPARSE && PCI_GODIRECT
472 depends on X86_32_NON_STANDARD
473 ---help---
Ingo Molnar1b84e1c2008-07-10 15:55:27 +0200474 The SGI Visual Workstation series is an IA32-based workstation
475 based on SGI systems chips with some legacy PC hardware attached.
476
477 Say Y here to create a kernel to run on the SGI 320 or 540.
478
479 A kernel compiled for the Visual Workstation will run on general
480 PCs as well. See <file:Documentation/sgi-visws.txt> for details.
481
Ingo Molnar9c398012009-01-27 18:24:57 +0100482config X86_SUMMIT
483 bool "Summit/EXA (IBM x440)"
Ingo Molnare0c7ae32009-01-27 18:43:09 +0100484 depends on X86_32_NON_STANDARD
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100485 ---help---
Ingo Molnar9c398012009-01-27 18:24:57 +0100486 This option is needed for IBM systems that use the Summit/EXA chipset.
487 In particular, it is needed for the x440.
Ingo Molnar1f972762008-07-26 13:52:50 +0200488
Ingo Molnar9c398012009-01-27 18:24:57 +0100489config X86_ES7000
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800490 bool "Unisys ES7000 IA32 series"
Yinghai Lu26f7ef12009-01-29 14:19:22 -0800491 depends on X86_32_NON_STANDARD && X86_BIGSMP
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100492 ---help---
Ingo Molnar9c398012009-01-27 18:24:57 +0100493 Support for Unisys ES7000 systems. Say 'Y' here if this kernel is
494 supposed to run on an IA32-based Unisys ES7000 system.
495
Ingo Molnarae1e9132008-11-11 09:05:16 +0100496config SCHED_OMIT_FRAME_POINTER
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100497 def_bool y
498 prompt "Single-depth WCHAN output"
Ken Chena87d0912008-11-06 11:10:49 -0800499 depends on X86
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100500 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100501 Calculate simpler /proc/<PID>/wchan values. If this option
502 is disabled then wchan values will recurse back to the
503 caller function. This provides more accurate wchan values,
504 at the expense of slightly more scheduling overhead.
505
506 If in doubt, say "Y".
507
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100508menuconfig PARAVIRT_GUEST
509 bool "Paravirtualized guest support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100510 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100511 Say Y here to get to see options related to running Linux under
512 various hypervisors. This option alone does not add any kernel code.
513
514 If you say N, all options in this submenu will be skipped and disabled.
515
516if PARAVIRT_GUEST
517
518source "arch/x86/xen/Kconfig"
519
520config VMI
Alok Katariad0153ca2009-09-29 10:25:24 -0700521 bool "VMI Guest support (DEPRECATED)"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100522 select PARAVIRT
Eduardo Pereira Habkost42d545c2008-01-30 13:33:32 +0100523 depends on X86_32
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100524 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100525 VMI provides a paravirtualized interface to the VMware ESX server
526 (it could be used by other hypervisors in theory too, but is not
527 at the moment), by linking the kernel to a GPL-ed ROM module
528 provided by the hypervisor.
529
Alok Katariad0153ca2009-09-29 10:25:24 -0700530 As of September 2009, VMware has started a phased retirement
531 of this feature from VMware's products. Please see
532 feature-removal-schedule.txt for details. If you are
533 planning to enable this option, please note that you cannot
534 live migrate a VMI enabled VM to a future VMware product,
535 which doesn't support VMI. So if you expect your kernel to
536 seamlessly migrate to newer VMware products, keep this
537 disabled.
538
Glauber de Oliveira Costa790c73f2008-02-15 17:52:48 -0200539config KVM_CLOCK
540 bool "KVM paravirtualized clock"
541 select PARAVIRT
Gerd Hoffmannf6e16d52008-06-03 16:17:32 +0200542 select PARAVIRT_CLOCK
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100543 ---help---
Glauber de Oliveira Costa790c73f2008-02-15 17:52:48 -0200544 Turning on this option will allow you to run a paravirtualized clock
545 when running over the KVM hypervisor. Instead of relying on a PIT
546 (or probably other) emulation by the underlying device model, the host
547 provides the guest with timing infrastructure such as time of day, and
548 system time
549
Marcelo Tosatti0cf1bfd2008-02-22 12:21:36 -0500550config KVM_GUEST
551 bool "KVM Guest support"
552 select PARAVIRT
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100553 ---help---
554 This option enables various optimizations for running under the KVM
555 hypervisor.
Marcelo Tosatti0cf1bfd2008-02-22 12:21:36 -0500556
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100557source "arch/x86/lguest/Kconfig"
558
Eduardo Pereira Habkoste61bd942008-01-30 13:33:32 +0100559config PARAVIRT
560 bool "Enable paravirtualization code"
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100561 ---help---
Eduardo Pereira Habkoste61bd942008-01-30 13:33:32 +0100562 This changes the kernel so it can modify itself when it is run
563 under a hypervisor, potentially improving performance significantly
564 over full virtualization. However, when run without a hypervisor
565 the kernel is theoretically slower and slightly larger.
566
Jeremy Fitzhardingeb4ecc122009-05-13 17:16:55 -0700567config PARAVIRT_SPINLOCKS
568 bool "Paravirtualization layer for spinlocks"
569 depends on PARAVIRT && SMP && EXPERIMENTAL
570 ---help---
571 Paravirtualized spinlocks allow a pvops backend to replace the
572 spinlock implementation with something virtualization-friendly
573 (for example, block the virtual CPU rather than spinning).
574
575 Unfortunately the downside is an up to 5% performance hit on
576 native kernels, with various workloads.
577
578 If you are unsure how to answer this question, answer N.
579
Gerd Hoffmann7af192c2008-06-03 16:17:29 +0200580config PARAVIRT_CLOCK
581 bool
Gerd Hoffmann7af192c2008-06-03 16:17:29 +0200582
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100583endif
584
Jeremy Fitzhardinge97349132008-06-25 00:19:14 -0400585config PARAVIRT_DEBUG
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100586 bool "paravirt-ops debugging"
587 depends on PARAVIRT && DEBUG_KERNEL
588 ---help---
589 Enable to debug paravirt_ops internals. Specifically, BUG if
590 a paravirt_op is missing when it is called.
Jeremy Fitzhardinge97349132008-06-25 00:19:14 -0400591
Yinghai Lu08677212010-02-10 01:20:20 -0800592config NO_BOOTMEM
593 default y
594 bool "Disable Bootmem code"
Yinghai Lu08677212010-02-10 01:20:20 -0800595 ---help---
596 Use early_res directly instead of bootmem before slab is ready.
597 - allocator (buddy) [generic]
598 - early allocator (bootmem) [generic]
599 - very early allocator (reserve_early*()) [x86]
600 - very very early allocator (early brk model) [x86]
601 So reduce one layer between early allocator to final allocator
602
603
Yinghai Lu03273182008-04-18 17:49:15 -0700604config MEMTEST
605 bool "Memtest"
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100606 ---help---
Yinghai Luc64df702008-03-21 18:56:19 -0700607 This option adds a kernel parameter 'memtest', which allows memtest
Yinghai Lu03273182008-04-18 17:49:15 -0700608 to be set.
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100609 memtest=0, mean disabled; -- default
610 memtest=1, mean do 1 test pattern;
611 ...
612 memtest=4, mean do 4 test patterns.
Thomas Gleixneraba37282008-07-15 14:48:48 +0200613 If you are unsure how to answer this question, answer N.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100614
615config X86_SUMMIT_NUMA
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100616 def_bool y
Ingo Molnare0c7ae32009-01-27 18:43:09 +0100617 depends on X86_32 && NUMA && X86_32_NON_STANDARD
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100618
619config X86_CYCLONE_TIMER
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100620 def_bool y
Ingo Molnare0c7ae32009-01-27 18:43:09 +0100621 depends on X86_32_NON_STANDARD
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100622
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100623source "arch/x86/Kconfig.cpu"
624
625config HPET_TIMER
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100626 def_bool X86_64
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100627 prompt "HPET Timer Support" if X86_32
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100628 ---help---
629 Use the IA-PC HPET (High Precision Event Timer) to manage
630 time in preference to the PIT and RTC, if a HPET is
631 present.
632 HPET is the next generation timer replacing legacy 8254s.
633 The HPET provides a stable time base on SMP
634 systems, unlike the TSC, but it is more expensive to access,
635 as it is off-chip. You can find the HPET spec at
636 <http://www.intel.com/hardwaredesign/hpetspec_1.pdf>.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100637
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100638 You can safely choose Y here. However, HPET will only be
639 activated if the platform and the BIOS support this feature.
640 Otherwise the 8254 will be used for timing services.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100641
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100642 Choose N to continue using the legacy 8254 timer.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100643
644config HPET_EMULATE_RTC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100645 def_bool y
Bernhard Walle9d8af782008-02-06 01:38:52 -0800646 depends on HPET_TIMER && (RTC=y || RTC=m || RTC_DRV_CMOS=m || RTC_DRV_CMOS=y)
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100647
Jacob Panbb24c472009-09-02 07:37:17 -0700648config APB_TIMER
649 def_bool y if MRST
650 prompt "Langwell APB Timer Support" if X86_MRST
651 help
652 APB timer is the replacement for 8254, HPET on X86 MID platforms.
653 The APBT provides a stable time base on SMP
654 systems, unlike the TSC, but it is more expensive to access,
655 as it is off-chip. APB timers are always running regardless of CPU
656 C states, they are used as per CPU clockevent device when possible.
657
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100658# Mark as embedded because too many people got it wrong.
659# The code disables itself when not needed.
Thomas Petazzoni7ae93922008-04-28 02:14:14 -0700660config DMI
661 default y
662 bool "Enable DMI scanning" if EMBEDDED
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100663 ---help---
Thomas Petazzoni7ae93922008-04-28 02:14:14 -0700664 Enabled scanning of DMI to identify machine quirks. Say Y
665 here unless you have verified that your setup is not
666 affected by entries in the DMI blacklist. Required by PNP
667 BIOS code.
668
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100669config GART_IOMMU
670 bool "GART IOMMU support" if EMBEDDED
671 default y
672 select SWIOTLB
Borislav Petkov0e152cd2010-03-12 15:43:03 +0100673 depends on X86_64 && PCI && K8_NB
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100674 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100675 Support for full DMA access of devices with 32bit memory access only
676 on systems with more than 3GB. This is usually needed for USB,
677 sound, many IDE/SATA chipsets and some other devices.
678 Provides a driver for the AMD Athlon64/Opteron/Turion/Sempron GART
679 based hardware IOMMU and a software bounce buffer based IOMMU used
680 on Intel systems and as fallback.
681 The code is only active when needed (enough memory and limited
682 device) unless CONFIG_IOMMU_DEBUG or iommu=force is specified
683 too.
684
685config CALGARY_IOMMU
686 bool "IBM Calgary IOMMU support"
687 select SWIOTLB
688 depends on X86_64 && PCI && EXPERIMENTAL
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100689 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100690 Support for hardware IOMMUs in IBM's xSeries x366 and x460
691 systems. Needed to run systems with more than 3GB of memory
692 properly with 32-bit PCI devices that do not support DAC
693 (Double Address Cycle). Calgary also supports bus level
694 isolation, where all DMAs pass through the IOMMU. This
695 prevents them from going anywhere except their intended
696 destination. This catches hard-to-find kernel bugs and
697 mis-behaving drivers and devices that do not use the DMA-API
698 properly to set up their DMA buffers. The IOMMU can be
699 turned off at boot time with the iommu=off parameter.
700 Normally the kernel will make the right choice by itself.
701 If unsure, say Y.
702
703config CALGARY_IOMMU_ENABLED_BY_DEFAULT
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100704 def_bool y
705 prompt "Should Calgary be enabled by default?"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100706 depends on CALGARY_IOMMU
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100707 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100708 Should Calgary be enabled by default? if you choose 'y', Calgary
709 will be used (if it exists). If you choose 'n', Calgary will not be
710 used even if it exists. If you choose 'n' and would like to use
711 Calgary anyway, pass 'iommu=calgary' on the kernel command line.
712 If unsure, say Y.
713
Joerg Roedel2b188722008-06-26 21:27:37 +0200714config AMD_IOMMU
715 bool "AMD IOMMU support"
Ingo Molnar07c40e82008-06-27 11:31:28 +0200716 select SWIOTLB
Joerg Roedela80dc3e2008-09-11 16:51:41 +0200717 select PCI_MSI
Ingo Molnar24d2ba02008-06-27 10:37:03 +0200718 depends on X86_64 && PCI && ACPI
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100719 ---help---
Joerg Roedel18d22202008-07-03 19:35:06 +0200720 With this option you can enable support for AMD IOMMU hardware in
721 your system. An IOMMU is a hardware component which provides
722 remapping of DMA memory accesses from devices. With an AMD IOMMU you
723 can isolate the the DMA memory of different devices and protect the
724 system from misbehaving device drivers or hardware.
725
726 You can find out if your system has an AMD IOMMU if you look into
727 your BIOS for an option to enable it or if you have an IVRS ACPI
728 table.
Joerg Roedel2b188722008-06-26 21:27:37 +0200729
Joerg Roedel2e117602008-12-11 19:00:12 +0100730config AMD_IOMMU_STATS
731 bool "Export AMD IOMMU statistics to debugfs"
732 depends on AMD_IOMMU
733 select DEBUG_FS
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100734 ---help---
Joerg Roedel2e117602008-12-11 19:00:12 +0100735 This option enables code in the AMD IOMMU driver to collect various
736 statistics about whats happening in the driver and exports that
737 information to userspace via debugfs.
738 If unsure, say N.
739
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100740# need this always selected by IOMMU for the VIA workaround
741config SWIOTLB
Joerg Roedela1afd012008-11-18 12:44:21 +0100742 def_bool y if X86_64
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100743 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100744 Support for software bounce buffers used on x86-64 systems
745 which don't have a hardware IOMMU (e.g. the current generation
746 of Intel's x86-64 CPUs). Using this PCI devices which can only
747 access 32-bits of memory can be used on systems with more than
748 3 GB of memory. If unsure, say Y.
749
FUJITA Tomonoria8522502008-04-29 00:59:36 -0700750config IOMMU_HELPER
FUJITA Tomonori18b743d2008-07-10 09:50:50 +0900751 def_bool (CALGARY_IOMMU || GART_IOMMU || SWIOTLB || AMD_IOMMU)
Linus Torvaldsd25e26b2008-08-25 14:15:38 -0700752
Joerg Roedel1aaf1182008-11-26 17:25:13 +0100753config IOMMU_API
754 def_bool (AMD_IOMMU || DMAR)
755
Mike Travis1184dc22008-05-12 21:21:12 +0200756config MAXSMP
Samuel Thibaultddb0c5a2010-08-21 21:32:41 +0200757 bool "Enable Maximum number of SMP Processors and NUMA Nodes"
Mike Travis36f51012008-12-16 17:33:51 -0800758 depends on X86_64 && SMP && DEBUG_KERNEL && EXPERIMENTAL
759 select CPUMASK_OFFSTACK
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100760 ---help---
Samuel Thibaultddb0c5a2010-08-21 21:32:41 +0200761 Enable maximum number of CPUS and NUMA Nodes for this architecture.
Mike Travis1184dc22008-05-12 21:21:12 +0200762 If unsure, say N.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100763
764config NR_CPUS
Mike Travis36f51012008-12-16 17:33:51 -0800765 int "Maximum number of CPUs" if SMP && !MAXSMP
Michael K. Johnson2a3313f2009-04-21 21:44:48 -0400766 range 2 8 if SMP && X86_32 && !X86_BIGSMP
Mike Travis36f51012008-12-16 17:33:51 -0800767 range 2 512 if SMP && !MAXSMP
Mike Travis78637a92008-12-16 17:34:00 -0800768 default "1" if !SMP
Linus Torvaldsd25e26b2008-08-25 14:15:38 -0700769 default "4096" if MAXSMP
Mike Travis78637a92008-12-16 17:34:00 -0800770 default "32" if SMP && (X86_NUMAQ || X86_SUMMIT || X86_BIGSMP || X86_ES7000)
771 default "8" if SMP
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100772 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100773 This allows you to specify the maximum number of CPUs which this
Linus Torvaldsd25e26b2008-08-25 14:15:38 -0700774 kernel will support. The maximum supported value is 512 and the
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100775 minimum value which makes sense is 2.
776
777 This is purely to save memory - each supported CPU adds
778 approximately eight kilobytes to the kernel image.
779
780config SCHED_SMT
781 bool "SMT (Hyperthreading) scheduler support"
Hiroshi Shimamotob089c122008-02-27 13:16:30 -0800782 depends on X86_HT
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100783 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100784 SMT scheduler support improves the CPU scheduler's decision making
785 when dealing with Intel Pentium 4 chips with HyperThreading at a
786 cost of slightly increased overhead in some places. If unsure say
787 N here.
788
789config SCHED_MC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100790 def_bool y
791 prompt "Multi-core scheduler support"
Hiroshi Shimamotob089c122008-02-27 13:16:30 -0800792 depends on X86_HT
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100793 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100794 Multi-core scheduler support improves the CPU scheduler's decision
795 making when dealing with multi-core CPU chips at a cost of slightly
796 increased overhead in some places. If unsure say N here.
797
Venkatesh Pallipadie82b8e42010-10-04 17:03:20 -0700798config IRQ_TIME_ACCOUNTING
799 bool "Fine granularity task level IRQ time accounting"
800 default n
801 ---help---
802 Select this option to enable fine granularity task irq time
803 accounting. This is done by reading a timestamp on each
804 transitions between softirq and hardirq state, so there can be a
805 small performance impact.
806
807 If in doubt, say N here.
808
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100809source "kernel/Kconfig.preempt"
810
811config X86_UP_APIC
812 bool "Local APIC support on uniprocessors"
Ingo Molnare0c7ae32009-01-27 18:43:09 +0100813 depends on X86_32 && !SMP && !X86_32_NON_STANDARD
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100814 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100815 A local APIC (Advanced Programmable Interrupt Controller) is an
816 integrated interrupt controller in the CPU. If you have a single-CPU
817 system which has a processor with a local APIC, you can say Y here to
818 enable and use it. If you say Y here even though your machine doesn't
819 have a local APIC, then the kernel will still run with no slowdown at
820 all. The local APIC supports CPU-generated self-interrupts (timer,
821 performance counters), and the NMI watchdog which detects hard
822 lockups.
823
824config X86_UP_IOAPIC
825 bool "IO-APIC support on uniprocessors"
826 depends on X86_UP_APIC
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100827 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100828 An IO-APIC (I/O Advanced Programmable Interrupt Controller) is an
829 SMP-capable replacement for PC-style interrupt controllers. Most
830 SMP systems and many recent uniprocessor systems have one.
831
832 If you have a single-CPU system with an IO-APIC, you can say Y here
833 to use it. If you say Y here even though your machine doesn't have
834 an IO-APIC, then the kernel will still run with no slowdown at all.
835
836config X86_LOCAL_APIC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100837 def_bool y
Ingo Molnare0c7ae32009-01-27 18:43:09 +0100838 depends on X86_64 || SMP || X86_32_NON_STANDARD || X86_UP_APIC
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100839
840config X86_IO_APIC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100841 def_bool y
Ingo Molnare0c7ae32009-01-27 18:43:09 +0100842 depends on X86_64 || SMP || X86_32_NON_STANDARD || X86_UP_APIC
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100843
844config X86_VISWS_APIC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100845 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100846 depends on X86_32 && X86_VISWS
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100847
Stefan Assmann41b9eb22008-07-15 13:48:55 +0200848config X86_REROUTE_FOR_BROKEN_BOOT_IRQS
849 bool "Reroute for broken boot IRQs"
Stefan Assmann41b9eb22008-07-15 13:48:55 +0200850 depends on X86_IO_APIC
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100851 ---help---
Stefan Assmann41b9eb22008-07-15 13:48:55 +0200852 This option enables a workaround that fixes a source of
853 spurious interrupts. This is recommended when threaded
854 interrupt handling is used on systems where the generation of
855 superfluous "boot interrupts" cannot be disabled.
856
857 Some chipsets generate a legacy INTx "boot IRQ" when the IRQ
858 entry in the chipset's IO-APIC is masked (as, e.g. the RT
859 kernel does during interrupt handling). On chipsets where this
860 boot IRQ generation cannot be disabled, this workaround keeps
861 the original IRQ line masked so that only the equivalent "boot
862 IRQ" is delivered to the CPUs. The workaround also tells the
863 kernel to set up the IRQ handler on the boot IRQ line. In this
864 way only one interrupt is delivered to the kernel. Otherwise
865 the spurious second interrupt may cause the kernel to bring
866 down (vital) interrupt lines.
867
868 Only affects "broken" chipsets. Interrupt sharing may be
869 increased on these systems.
870
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100871config X86_MCE
Andi Kleenbab9bc62009-07-09 00:31:38 +0200872 bool "Machine Check / overheating reporting"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100873 ---help---
Andi Kleenbab9bc62009-07-09 00:31:38 +0200874 Machine Check support allows the processor to notify the
875 kernel if it detects a problem (e.g. overheating, data corruption).
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100876 The action the kernel takes depends on the severity of the problem,
Andi Kleenbab9bc62009-07-09 00:31:38 +0200877 ranging from warning messages to halting the machine.
Andi Kleen4efc0672009-04-28 19:07:31 +0200878
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100879config X86_MCE_INTEL
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100880 def_bool y
881 prompt "Intel MCE features"
Andi Kleenc1ebf832009-07-09 00:31:41 +0200882 depends on X86_MCE && X86_LOCAL_APIC
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100883 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100884 Additional support for intel specific MCE features such as
885 the thermal monitor.
886
887config X86_MCE_AMD
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100888 def_bool y
889 prompt "AMD MCE features"
Andi Kleenc1ebf832009-07-09 00:31:41 +0200890 depends on X86_MCE && X86_LOCAL_APIC
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100891 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100892 Additional support for AMD specific MCE features such as
893 the DRAM Error Threshold.
894
Andi Kleen4efc0672009-04-28 19:07:31 +0200895config X86_ANCIENT_MCE
Jan Beulich6fc108a2010-04-21 15:23:44 +0100896 bool "Support for old Pentium 5 / WinChip machine checks"
Andi Kleenc31d9632009-07-09 00:31:37 +0200897 depends on X86_32 && X86_MCE
Hidetoshi Setocd13adcc2009-05-27 16:57:31 +0900898 ---help---
899 Include support for machine check handling on old Pentium 5 or WinChip
900 systems. These typically need to be enabled explicitely on the command
901 line.
Andi Kleen4efc0672009-04-28 19:07:31 +0200902
Andi Kleenb2762682009-02-12 13:49:31 +0100903config X86_MCE_THRESHOLD
904 depends on X86_MCE_AMD || X86_MCE_INTEL
Jan Beulich6fc108a2010-04-21 15:23:44 +0100905 def_bool y
Andi Kleenb2762682009-02-12 13:49:31 +0100906
Andi Kleenea149b32009-04-29 19:31:00 +0200907config X86_MCE_INJECT
Andi Kleenc1ebf832009-07-09 00:31:41 +0200908 depends on X86_MCE
Andi Kleenea149b32009-04-29 19:31:00 +0200909 tristate "Machine check injector support"
910 ---help---
911 Provide support for injecting machine checks for testing purposes.
912 If you don't know what a machine check is and you don't do kernel
913 QA it is safe to say n.
914
Andi Kleen4efc0672009-04-28 19:07:31 +0200915config X86_THERMAL_VECTOR
916 def_bool y
Andi Kleen5bb38ad2009-07-09 00:31:39 +0200917 depends on X86_MCE_INTEL
Andi Kleen4efc0672009-04-28 19:07:31 +0200918
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100919config VM86
920 bool "Enable VM86 support" if EMBEDDED
921 default y
922 depends on X86_32
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100923 ---help---
924 This option is required by programs like DOSEMU to run 16-bit legacy
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100925 code on X86 processors. It also may be needed by software like
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100926 XFree86 to initialize some video cards via BIOS. Disabling this
927 option saves about 6k.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100928
929config TOSHIBA
930 tristate "Toshiba Laptop support"
931 depends on X86_32
932 ---help---
933 This adds a driver to safely access the System Management Mode of
934 the CPU on Toshiba portables with a genuine Toshiba BIOS. It does
935 not work on models with a Phoenix BIOS. The System Management Mode
936 is used to set the BIOS and power saving options on Toshiba portables.
937
938 For information on utilities to make use of this driver see the
939 Toshiba Linux utilities web site at:
940 <http://www.buzzard.org.uk/toshiba/>.
941
942 Say Y if you intend to run this kernel on a Toshiba portable.
943 Say N otherwise.
944
945config I8K
946 tristate "Dell laptop support"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100947 ---help---
948 This adds a driver to safely access the System Management Mode
949 of the CPU on the Dell Inspiron 8000. The System Management Mode
950 is used to read cpu temperature and cooling fan status and to
951 control the fans on the I8K portables.
952
953 This driver has been tested only on the Inspiron 8000 but it may
954 also work with other Dell laptops. You can force loading on other
955 models by passing the parameter `force=1' to the module. Use at
956 your own risk.
957
958 For information on utilities to make use of this driver see the
959 I8K Linux utilities web site at:
960 <http://people.debian.org/~dz/i8k/>
961
962 Say Y if you intend to run this kernel on a Dell Inspiron 8000.
963 Say N otherwise.
964
965config X86_REBOOTFIXUPS
Jan Beulich9ba16082008-10-15 22:01:38 -0700966 bool "Enable X86 board specific fixups for reboot"
967 depends on X86_32
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100968 ---help---
969 This enables chipset and/or board specific fixups to be done
970 in order to get reboot to work correctly. This is only needed on
971 some combinations of hardware and BIOS. The symptom, for which
972 this config is intended, is when reboot ends with a stalled/hung
973 system.
974
975 Currently, the only fixup is for the Geode machines using
Florian Fainelli5e3a77e2008-01-30 13:33:36 +0100976 CS5530A and CS5536 chipsets and the RDC R-321x SoC.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100977
978 Say Y if you want to enable the fixup. Currently, it's safe to
979 enable this option even if you don't need it.
980 Say N otherwise.
981
982config MICROCODE
Peter Oruba8d86f392008-07-28 18:44:21 +0200983 tristate "/dev/cpu/microcode - microcode support"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100984 select FW_LOADER
985 ---help---
986 If you say Y here, you will be able to update the microcode on
Peter Oruba80cc9f12008-07-28 18:44:22 +0200987 certain Intel and AMD processors. The Intel support is for the
988 IA32 family, e.g. Pentium Pro, Pentium II, Pentium III,
989 Pentium 4, Xeon etc. The AMD support is for family 0x10 and
990 0x11 processors, e.g. Opteron, Phenom and Turion 64 Ultra.
991 You will obviously need the actual microcode binary data itself
992 which is not shipped with the Linux kernel.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100993
Peter Oruba8d86f392008-07-28 18:44:21 +0200994 This option selects the general module only, you need to select
995 at least one vendor specific module as well.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100996
997 To compile this driver as a module, choose M here: the
998 module will be called microcode.
999
Peter Oruba8d86f392008-07-28 18:44:21 +02001000config MICROCODE_INTEL
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001001 bool "Intel microcode patch loading support"
1002 depends on MICROCODE
1003 default MICROCODE
1004 select FW_LOADER
1005 ---help---
1006 This options enables microcode patch loading support for Intel
1007 processors.
Peter Oruba8d86f392008-07-28 18:44:21 +02001008
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001009 For latest news and information on obtaining all the required
1010 Intel ingredients for this driver, check:
1011 <http://www.urbanmyth.org/microcode/>.
Peter Oruba8d86f392008-07-28 18:44:21 +02001012
Peter Oruba80cc9f12008-07-28 18:44:22 +02001013config MICROCODE_AMD
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001014 bool "AMD microcode patch loading support"
1015 depends on MICROCODE
1016 select FW_LOADER
1017 ---help---
1018 If you select this option, microcode patch loading support for AMD
1019 processors will be enabled.
Peter Oruba80cc9f12008-07-28 18:44:22 +02001020
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001021config MICROCODE_OLD_INTERFACE
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001022 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001023 depends on MICROCODE
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001024
1025config X86_MSR
1026 tristate "/dev/cpu/*/msr - Model-specific register support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001027 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001028 This device gives privileged processes access to the x86
1029 Model-Specific Registers (MSRs). It is a character device with
1030 major 202 and minors 0 to 31 for /dev/cpu/0/msr to /dev/cpu/31/msr.
1031 MSR accesses are directed to a specific CPU on multi-processor
1032 systems.
1033
1034config X86_CPUID
1035 tristate "/dev/cpu/*/cpuid - CPU information support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001036 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001037 This device gives processes access to the x86 CPUID instruction to
1038 be executed on a specific processor. It is a character device
1039 with major 203 and minors 0 to 31 for /dev/cpu/0/cpuid to
1040 /dev/cpu/31/cpuid.
1041
1042choice
1043 prompt "High Memory Support"
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001044 default HIGHMEM64G if X86_NUMAQ
Jan Beulich6fc108a2010-04-21 15:23:44 +01001045 default HIGHMEM4G
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001046 depends on X86_32
1047
1048config NOHIGHMEM
1049 bool "off"
1050 depends on !X86_NUMAQ
1051 ---help---
1052 Linux can use up to 64 Gigabytes of physical memory on x86 systems.
1053 However, the address space of 32-bit x86 processors is only 4
1054 Gigabytes large. That means that, if you have a large amount of
1055 physical memory, not all of it can be "permanently mapped" by the
1056 kernel. The physical memory that's not permanently mapped is called
1057 "high memory".
1058
1059 If you are compiling a kernel which will never run on a machine with
1060 more than 1 Gigabyte total physical RAM, answer "off" here (default
1061 choice and suitable for most users). This will result in a "3GB/1GB"
1062 split: 3GB are mapped so that each process sees a 3GB virtual memory
1063 space and the remaining part of the 4GB virtual memory space is used
1064 by the kernel to permanently map as much physical memory as
1065 possible.
1066
1067 If the machine has between 1 and 4 Gigabytes physical RAM, then
1068 answer "4GB" here.
1069
1070 If more than 4 Gigabytes is used then answer "64GB" here. This
1071 selection turns Intel PAE (Physical Address Extension) mode on.
1072 PAE implements 3-level paging on IA32 processors. PAE is fully
1073 supported by Linux, PAE mode is implemented on all recent Intel
1074 processors (Pentium Pro and better). NOTE: If you say "64GB" here,
1075 then the kernel will not boot on CPUs that don't support PAE!
1076
1077 The actual amount of total physical memory will either be
1078 auto detected or can be forced by using a kernel command line option
1079 such as "mem=256M". (Try "man bootparam" or see the documentation of
1080 your boot loader (lilo or loadlin) about how to pass options to the
1081 kernel at boot time.)
1082
1083 If unsure, say "off".
1084
1085config HIGHMEM4G
1086 bool "4GB"
1087 depends on !X86_NUMAQ
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001088 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001089 Select this if you have a 32-bit processor and between 1 and 4
1090 gigabytes of physical RAM.
1091
1092config HIGHMEM64G
1093 bool "64GB"
1094 depends on !M386 && !M486
1095 select X86_PAE
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001096 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001097 Select this if you have a 32-bit processor and more than 4
1098 gigabytes of physical RAM.
1099
1100endchoice
1101
1102choice
1103 depends on EXPERIMENTAL
1104 prompt "Memory split" if EMBEDDED
1105 default VMSPLIT_3G
1106 depends on X86_32
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001107 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001108 Select the desired split between kernel and user memory.
1109
1110 If the address range available to the kernel is less than the
1111 physical memory installed, the remaining memory will be available
1112 as "high memory". Accessing high memory is a little more costly
1113 than low memory, as it needs to be mapped into the kernel first.
1114 Note that increasing the kernel address space limits the range
1115 available to user programs, making the address space there
1116 tighter. Selecting anything other than the default 3G/1G split
1117 will also likely make your kernel incompatible with binary-only
1118 kernel modules.
1119
1120 If you are not absolutely sure what you are doing, leave this
1121 option alone!
1122
1123 config VMSPLIT_3G
1124 bool "3G/1G user/kernel split"
1125 config VMSPLIT_3G_OPT
1126 depends on !X86_PAE
1127 bool "3G/1G user/kernel split (for full 1G low memory)"
1128 config VMSPLIT_2G
1129 bool "2G/2G user/kernel split"
1130 config VMSPLIT_2G_OPT
1131 depends on !X86_PAE
1132 bool "2G/2G user/kernel split (for full 2G low memory)"
1133 config VMSPLIT_1G
1134 bool "1G/3G user/kernel split"
1135endchoice
1136
1137config PAGE_OFFSET
1138 hex
1139 default 0xB0000000 if VMSPLIT_3G_OPT
1140 default 0x80000000 if VMSPLIT_2G
1141 default 0x78000000 if VMSPLIT_2G_OPT
1142 default 0x40000000 if VMSPLIT_1G
1143 default 0xC0000000
1144 depends on X86_32
1145
1146config HIGHMEM
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001147 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001148 depends on X86_32 && (HIGHMEM64G || HIGHMEM4G)
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001149
1150config X86_PAE
Jan Beulich9ba16082008-10-15 22:01:38 -07001151 bool "PAE (Physical Address Extension) Support"
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001152 depends on X86_32 && !HIGHMEM4G
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001153 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001154 PAE is required for NX support, and furthermore enables
1155 larger swapspace support for non-overcommit purposes. It
1156 has the cost of more pagetable lookup overhead, and also
1157 consumes more pagetable space per process.
1158
Jeremy Fitzhardinge600715d2008-09-11 01:31:45 -07001159config ARCH_PHYS_ADDR_T_64BIT
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001160 def_bool X86_64 || X86_PAE
Jeremy Fitzhardinge600715d2008-09-11 01:31:45 -07001161
Nick Piggin9e899812008-10-22 12:33:16 +02001162config DIRECT_GBPAGES
1163 bool "Enable 1GB pages for kernel pagetables" if EMBEDDED
1164 default y
1165 depends on X86_64
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001166 ---help---
Nick Piggin9e899812008-10-22 12:33:16 +02001167 Allow the kernel linear mapping to use 1GB pages on CPUs that
1168 support it. This can improve the kernel's performance a tiny bit by
1169 reducing TLB pressure. If in doubt, say "Y".
1170
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001171# Common NUMA Features
1172config NUMA
KOSAKI Motohirofd51b2d2008-11-05 02:27:19 +09001173 bool "Numa Memory Allocation and Scheduler Support"
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001174 depends on SMP
Rafael J. Wysocki604d2052008-11-12 23:26:14 +01001175 depends on X86_64 || (X86_32 && HIGHMEM64G && (X86_NUMAQ || X86_BIGSMP || X86_SUMMIT && ACPI) && EXPERIMENTAL)
Yinghai Lu0699eae2008-06-17 15:39:01 -07001176 default y if (X86_NUMAQ || X86_SUMMIT || X86_BIGSMP)
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001177 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001178 Enable NUMA (Non Uniform Memory Access) support.
KOSAKI Motohirofd51b2d2008-11-05 02:27:19 +09001179
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001180 The kernel will try to allocate memory used by a CPU on the
1181 local memory controller of the CPU and add some more
1182 NUMA awareness to the kernel.
1183
Ingo Molnarc280ea52008-11-08 13:29:45 +01001184 For 64-bit this is recommended if the system is Intel Core i7
KOSAKI Motohirofd51b2d2008-11-05 02:27:19 +09001185 (or later), AMD Opteron, or EM64T NUMA.
1186
1187 For 32-bit this is only needed on (rare) 32-bit-only platforms
1188 that support NUMA topologies, such as NUMAQ / Summit, or if you
1189 boot a 32-bit kernel on a 64-bit NUMA platform.
1190
1191 Otherwise, you should say N.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001192
1193comment "NUMA (Summit) requires SMP, 64GB highmem support, ACPI"
1194 depends on X86_32 && X86_SUMMIT && (!HIGHMEM64G || !ACPI)
1195
1196config K8_NUMA
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001197 def_bool y
1198 prompt "Old style AMD Opteron NUMA detection"
1199 depends on X86_64 && NUMA && PCI
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001200 ---help---
1201 Enable K8 NUMA node topology detection. You should say Y here if
1202 you have a multi processor AMD K8 system. This uses an old
1203 method to read the NUMA configuration directly from the builtin
1204 Northbridge of Opteron. It is recommended to use X86_64_ACPI_NUMA
1205 instead, which also takes priority if both are compiled in.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001206
1207config X86_64_ACPI_NUMA
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001208 def_bool y
1209 prompt "ACPI NUMA detection"
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001210 depends on X86_64 && NUMA && ACPI && PCI
1211 select ACPI_NUMA
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001212 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001213 Enable ACPI SRAT based node topology detection.
1214
Suresh Siddha6ec6e0d2008-03-25 10:14:35 -07001215# Some NUMA nodes have memory ranges that span
1216# other nodes. Even though a pfn is valid and
1217# between a node's start and end pfns, it may not
1218# reside on that node. See memmap_init_zone()
1219# for details.
1220config NODES_SPAN_OTHER_NODES
1221 def_bool y
1222 depends on X86_64_ACPI_NUMA
1223
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001224config NUMA_EMU
1225 bool "NUMA emulation"
1226 depends on X86_64 && NUMA
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001227 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001228 Enable NUMA emulation. A flat machine will be split
1229 into virtual nodes when booted with "numa=fake=N", where N is the
1230 number of nodes. This is only useful for debugging.
1231
1232config NODES_SHIFT
Linus Torvaldsd25e26b2008-08-25 14:15:38 -07001233 int "Maximum NUMA Nodes (as a power of 2)" if !MAXSMP
David Rientjes51591e32010-03-25 15:39:27 -07001234 range 1 10
1235 default "10" if MAXSMP
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001236 default "6" if X86_64
1237 default "4" if X86_NUMAQ
1238 default "3"
1239 depends on NEED_MULTIPLE_NODES
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001240 ---help---
Mike Travis1184dc22008-05-12 21:21:12 +02001241 Specify the maximum number of NUMA Nodes available on the target
Matt LaPlante692105b2009-01-26 11:12:25 +01001242 system. Increases memory reserved to accommodate various tables.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001243
Tejun Heoc1329372009-02-24 11:57:20 +09001244config HAVE_ARCH_BOOTMEM
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001245 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001246 depends on X86_32 && NUMA
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001247
1248config ARCH_HAVE_MEMORY_PRESENT
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001249 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001250 depends on X86_32 && DISCONTIGMEM
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001251
1252config NEED_NODE_MEMMAP_SIZE
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001253 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001254 depends on X86_32 && (DISCONTIGMEM || SPARSEMEM)
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001255
1256config HAVE_ARCH_ALLOC_REMAP
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001257 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001258 depends on X86_32 && NUMA
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001259
1260config ARCH_FLATMEM_ENABLE
1261 def_bool y
Jeff Chua99809962008-08-06 19:09:53 +08001262 depends on X86_32 && ARCH_SELECT_MEMORY_MODEL && !NUMA
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001263
1264config ARCH_DISCONTIGMEM_ENABLE
1265 def_bool y
Christoph Lameterb2632952008-01-30 13:30:47 +01001266 depends on NUMA && X86_32
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001267
1268config ARCH_DISCONTIGMEM_DEFAULT
1269 def_bool y
Christoph Lameterb2632952008-01-30 13:30:47 +01001270 depends on NUMA && X86_32
1271
KAMEZAWA Hiroyuki94925872009-09-22 16:45:45 -07001272config ARCH_PROC_KCORE_TEXT
1273 def_bool y
1274 depends on X86_64 && PROC_KCORE
1275
Christoph Lameterb2632952008-01-30 13:30:47 +01001276config ARCH_SPARSEMEM_DEFAULT
1277 def_bool y
1278 depends on X86_64
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001279
1280config ARCH_SPARSEMEM_ENABLE
1281 def_bool y
Yinghai Lu4272ebf2009-01-29 15:14:46 -08001282 depends on X86_64 || NUMA || (EXPERIMENTAL && X86_32) || X86_32_NON_STANDARD
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001283 select SPARSEMEM_STATIC if X86_32
1284 select SPARSEMEM_VMEMMAP_ENABLE if X86_64
1285
1286config ARCH_SELECT_MEMORY_MODEL
1287 def_bool y
Christoph Lameterb2632952008-01-30 13:30:47 +01001288 depends on ARCH_SPARSEMEM_ENABLE
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001289
1290config ARCH_MEMORY_PROBE
1291 def_bool X86_64
1292 depends on MEMORY_HOTPLUG
1293
Avi Kivitya29815a2010-01-10 16:28:09 +02001294config ILLEGAL_POINTER_VALUE
1295 hex
1296 default 0 if X86_32
1297 default 0xdead000000000000 if X86_64
1298
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001299source "mm/Kconfig"
1300
1301config HIGHPTE
1302 bool "Allocate 3rd-level pagetables from highmem"
Jan Beulich6fc108a2010-04-21 15:23:44 +01001303 depends on HIGHMEM
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001304 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001305 The VM uses one page table entry for each page of physical memory.
1306 For systems with a lot of RAM, this can be wasteful of precious
1307 low memory. Setting this option will put user-space page table
1308 entries in high memory.
1309
Jeremy Fitzhardinge9f077872008-09-07 01:51:34 -07001310config X86_CHECK_BIOS_CORRUPTION
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001311 bool "Check for low memory corruption"
1312 ---help---
1313 Periodically check for memory corruption in low memory, which
1314 is suspected to be caused by BIOS. Even when enabled in the
1315 configuration, it is disabled at runtime. Enable it by
1316 setting "memory_corruption_check=1" on the kernel command
1317 line. By default it scans the low 64k of memory every 60
1318 seconds; see the memory_corruption_check_size and
1319 memory_corruption_check_period parameters in
1320 Documentation/kernel-parameters.txt to adjust this.
Jeremy Fitzhardinge9f077872008-09-07 01:51:34 -07001321
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001322 When enabled with the default parameters, this option has
1323 almost no overhead, as it reserves a relatively small amount
1324 of memory and scans it infrequently. It both detects corruption
1325 and prevents it from affecting the running system.
Jeremy Fitzhardinge9f077872008-09-07 01:51:34 -07001326
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001327 It is, however, intended as a diagnostic tool; if repeatable
1328 BIOS-originated corruption always affects the same memory,
1329 you can use memmap= to prevent the kernel from using that
1330 memory.
Jeremy Fitzhardinge9f077872008-09-07 01:51:34 -07001331
Jeremy Fitzhardingec885df52008-09-07 02:37:32 -07001332config X86_BOOTPARAM_MEMORY_CORRUPTION_CHECK
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001333 bool "Set the default setting of memory_corruption_check"
Jeremy Fitzhardingec885df52008-09-07 02:37:32 -07001334 depends on X86_CHECK_BIOS_CORRUPTION
1335 default y
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001336 ---help---
1337 Set whether the default state of memory_corruption_check is
1338 on or off.
Jeremy Fitzhardingec885df52008-09-07 02:37:32 -07001339
Ingo Molnarfc381512008-09-16 10:07:34 +02001340config X86_RESERVE_LOW_64K
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001341 bool "Reserve low 64K of RAM on AMI/Phoenix BIOSen"
Ingo Molnarfc381512008-09-16 10:07:34 +02001342 default y
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001343 ---help---
1344 Reserve the first 64K of physical RAM on BIOSes that are known
1345 to potentially corrupt that memory range. A numbers of BIOSes are
1346 known to utilize this area during suspend/resume, so it must not
1347 be used by the kernel.
Ingo Molnarfc381512008-09-16 10:07:34 +02001348
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001349 Set this to N if you are absolutely sure that you trust the BIOS
1350 to get all its memory reservations and usages right.
Ingo Molnarfc381512008-09-16 10:07:34 +02001351
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001352 If you have doubts about the BIOS (e.g. suspend/resume does not
1353 work or there's kernel crashes after certain hardware hotplug
1354 events) and it's not AMI or Phoenix, then you might want to enable
1355 X86_CHECK_BIOS_CORRUPTION=y to allow the kernel to check typical
1356 corruption patterns.
Ingo Molnarfc381512008-09-16 10:07:34 +02001357
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001358 Say Y if unsure.
Ingo Molnarfc381512008-09-16 10:07:34 +02001359
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001360config MATH_EMULATION
1361 bool
1362 prompt "Math emulation" if X86_32
1363 ---help---
1364 Linux can emulate a math coprocessor (used for floating point
1365 operations) if you don't have one. 486DX and Pentium processors have
1366 a math coprocessor built in, 486SX and 386 do not, unless you added
1367 a 487DX or 387, respectively. (The messages during boot time can
1368 give you some hints here ["man dmesg"].) Everyone needs either a
1369 coprocessor or this emulation.
1370
1371 If you don't have a math coprocessor, you need to say Y here; if you
1372 say Y here even though you have a coprocessor, the coprocessor will
1373 be used nevertheless. (This behavior can be changed with the kernel
1374 command line option "no387", which comes handy if your coprocessor
1375 is broken. Try "man bootparam" or see the documentation of your boot
1376 loader (lilo or loadlin) about how to pass options to the kernel at
1377 boot time.) This means that it is a good idea to say Y here if you
1378 intend to use this kernel on different machines.
1379
1380 More information about the internals of the Linux math coprocessor
1381 emulation can be found in <file:arch/x86/math-emu/README>.
1382
1383 If you are not sure, say Y; apart from resulting in a 66 KB bigger
1384 kernel, it won't hurt.
1385
1386config MTRR
Jan Beulich6fc108a2010-04-21 15:23:44 +01001387 def_bool y
Arjan van de Venc03cb312009-10-11 10:33:02 -07001388 prompt "MTRR (Memory Type Range Register) support" if EMBEDDED
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001389 ---help---
1390 On Intel P6 family processors (Pentium Pro, Pentium II and later)
1391 the Memory Type Range Registers (MTRRs) may be used to control
1392 processor access to memory ranges. This is most useful if you have
1393 a video (VGA) card on a PCI or AGP bus. Enabling write-combining
1394 allows bus write transfers to be combined into a larger transfer
1395 before bursting over the PCI/AGP bus. This can increase performance
1396 of image write operations 2.5 times or more. Saying Y here creates a
1397 /proc/mtrr file which may be used to manipulate your processor's
1398 MTRRs. Typically the X server should use this.
1399
1400 This code has a reasonably generic interface so that similar
1401 control registers on other processors can be easily supported
1402 as well:
1403
1404 The Cyrix 6x86, 6x86MX and M II processors have Address Range
1405 Registers (ARRs) which provide a similar functionality to MTRRs. For
1406 these, the ARRs are used to emulate the MTRRs.
1407 The AMD K6-2 (stepping 8 and above) and K6-3 processors have two
1408 MTRRs. The Centaur C6 (WinChip) has 8 MCRs, allowing
1409 write-combining. All of these processors are supported by this code
1410 and it makes sense to say Y here if you have one of them.
1411
1412 Saying Y here also fixes a problem with buggy SMP BIOSes which only
1413 set the MTRRs for the boot CPU and not for the secondary CPUs. This
1414 can lead to all sorts of problems, so it's good to say Y here.
1415
1416 You can safely say Y even if your machine doesn't have MTRRs, you'll
1417 just add about 9 KB to your kernel.
1418
Randy Dunlap7225e752008-07-26 17:54:22 -07001419 See <file:Documentation/x86/mtrr.txt> for more information.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001420
Yinghai Lu95ffa242008-04-29 03:52:33 -07001421config MTRR_SANITIZER
Yinghai Lu2ffb3502008-09-30 16:29:40 -07001422 def_bool y
Yinghai Lu95ffa242008-04-29 03:52:33 -07001423 prompt "MTRR cleanup support"
1424 depends on MTRR
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001425 ---help---
Thomas Gleixneraba37282008-07-15 14:48:48 +02001426 Convert MTRR layout from continuous to discrete, so X drivers can
1427 add writeback entries.
Yinghai Lu95ffa242008-04-29 03:52:33 -07001428
Thomas Gleixneraba37282008-07-15 14:48:48 +02001429 Can be disabled with disable_mtrr_cleanup on the kernel command line.
Matt LaPlante692105b2009-01-26 11:12:25 +01001430 The largest mtrr entry size for a continuous block can be set with
Thomas Gleixneraba37282008-07-15 14:48:48 +02001431 mtrr_chunk_size.
Yinghai Lu95ffa242008-04-29 03:52:33 -07001432
Yinghai Lu2ffb3502008-09-30 16:29:40 -07001433 If unsure, say Y.
Yinghai Lu95ffa242008-04-29 03:52:33 -07001434
1435config MTRR_SANITIZER_ENABLE_DEFAULT
Yinghai Luf5098d62008-04-29 20:25:58 -07001436 int "MTRR cleanup enable value (0-1)"
1437 range 0 1
1438 default "0"
Yinghai Lu95ffa242008-04-29 03:52:33 -07001439 depends on MTRR_SANITIZER
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001440 ---help---
Yinghai Luf5098d62008-04-29 20:25:58 -07001441 Enable mtrr cleanup default value
Yinghai Lu95ffa242008-04-29 03:52:33 -07001442
Yinghai Lu12031a62008-05-02 02:40:22 -07001443config MTRR_SANITIZER_SPARE_REG_NR_DEFAULT
1444 int "MTRR cleanup spare reg num (0-7)"
1445 range 0 7
1446 default "1"
1447 depends on MTRR_SANITIZER
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001448 ---help---
Yinghai Lu12031a62008-05-02 02:40:22 -07001449 mtrr cleanup spare entries default, it can be changed via
Thomas Gleixneraba37282008-07-15 14:48:48 +02001450 mtrr_spare_reg_nr=N on the kernel command line.
Yinghai Lu12031a62008-05-02 02:40:22 -07001451
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001452config X86_PAT
Jan Beulich6fc108a2010-04-21 15:23:44 +01001453 def_bool y
Arjan van de Venc03cb312009-10-11 10:33:02 -07001454 prompt "x86 PAT support" if EMBEDDED
Ingo Molnar2a8a2712008-04-26 10:26:52 +02001455 depends on MTRR
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001456 ---help---
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001457 Use PAT attributes to setup page level cache control.
Venki Pallipadi042b78e2008-03-24 14:22:35 -07001458
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001459 PATs are the modern equivalents of MTRRs and are much more
1460 flexible than MTRRs.
1461
1462 Say N here if you see bootup problems (boot crash, boot hang,
Venki Pallipadi042b78e2008-03-24 14:22:35 -07001463 spontaneous reboots) or a non-working video driver.
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001464
1465 If unsure, say Y.
1466
Venkatesh Pallipadi46cf98c2009-07-10 09:57:37 -07001467config ARCH_USES_PG_UNCACHED
1468 def_bool y
1469 depends on X86_PAT
1470
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001471config EFI
Jan Beulich9ba16082008-10-15 22:01:38 -07001472 bool "EFI runtime service support"
Huang, Ying5b836832008-01-30 13:31:19 +01001473 depends on ACPI
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001474 ---help---
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001475 This enables the kernel to use EFI runtime services that are
1476 available (such as the EFI variable services).
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001477
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001478 This option is only useful on systems that have EFI firmware.
1479 In addition, you should use the latest ELILO loader available
1480 at <http://elilo.sourceforge.net> in order to take advantage
1481 of EFI runtime services. However, even with this option, the
1482 resultant kernel should continue to boot on existing non-EFI
1483 platforms.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001484
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001485config SECCOMP
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001486 def_bool y
1487 prompt "Enable seccomp to safely compute untrusted bytecode"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001488 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001489 This kernel feature is useful for number crunching applications
1490 that may need to compute untrusted bytecode during their
1491 execution. By using pipes or other transports made available to
1492 the process as file descriptors supporting the read/write
1493 syscalls, it's possible to isolate those applications in
1494 their own address space using seccomp. Once seccomp is
Alexey Dobriyan9c0bbee2008-09-09 11:01:31 +04001495 enabled via prctl(PR_SET_SECCOMP), it cannot be disabled
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001496 and the task is only allowed to execute a few safe syscalls
1497 defined by each seccomp mode.
1498
1499 If unsure, say Y. Only embedded should say N here.
1500
1501config CC_STACKPROTECTOR
1502 bool "Enable -fstack-protector buffer overflow detection (EXPERIMENTAL)"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001503 ---help---
1504 This option turns on the -fstack-protector GCC feature. This
Ingo Molnar113c5412008-02-14 10:36:03 +01001505 feature puts, at the beginning of functions, a canary value on
1506 the stack just before the return address, and validates
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001507 the value just before actually returning. Stack based buffer
1508 overflows (that need to overwrite this return address) now also
1509 overwrite the canary, which gets detected and the attack is then
1510 neutralized via a kernel panic.
1511
1512 This feature requires gcc version 4.2 or above, or a distribution
1513 gcc with the feature backported. Older versions are automatically
Ingo Molnar113c5412008-02-14 10:36:03 +01001514 detected and for those versions, this configuration option is
1515 ignored. (and a warning is printed during bootup)
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001516
1517source kernel/Kconfig.hz
1518
1519config KEXEC
1520 bool "kexec system call"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001521 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001522 kexec is a system call that implements the ability to shutdown your
1523 current kernel, and to start another kernel. It is like a reboot
1524 but it is independent of the system firmware. And like a reboot
1525 you can start any kernel with it, not just Linux.
1526
1527 The name comes from the similarity to the exec system call.
1528
1529 It is an ongoing process to be certain the hardware in a machine
1530 is properly shutdown, so do not be surprised if this code does not
1531 initially work for you. It may help to enable device hotplugging
1532 support. As of this writing the exact hardware interface is
1533 strongly in flux, so no good recommendation can be made.
1534
1535config CRASH_DUMP
Pavel Machek04b69442008-08-14 17:16:50 +02001536 bool "kernel crash dumps"
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001537 depends on X86_64 || (X86_32 && HIGHMEM)
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001538 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001539 Generate crash dump after being started by kexec.
1540 This should be normally only set in special crash dump kernels
1541 which are loaded in the main kernel with kexec-tools into
1542 a specially reserved region and then later executed after
1543 a crash by kdump/kexec. The crash dump kernel must be compiled
1544 to a memory address not used by the main kernel or BIOS using
1545 PHYSICAL_START, or it must be built as a relocatable image
1546 (CONFIG_RELOCATABLE=y).
1547 For more details see Documentation/kdump/kdump.txt
1548
Huang Ying3ab83522008-07-25 19:45:07 -07001549config KEXEC_JUMP
1550 bool "kexec jump (EXPERIMENTAL)"
1551 depends on EXPERIMENTAL
Huang Yingfee7b0d2009-03-10 10:57:16 +08001552 depends on KEXEC && HIBERNATION
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001553 ---help---
Huang Ying89081d12008-07-25 19:45:10 -07001554 Jump between original kernel and kexeced kernel and invoke
1555 code in physical address mode via KEXEC
Huang Ying3ab83522008-07-25 19:45:07 -07001556
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001557config PHYSICAL_START
1558 hex "Physical address where the kernel is loaded" if (EMBEDDED || CRASH_DUMP)
H. Peter Anvinceefccc2009-05-11 16:12:16 -07001559 default "0x1000000"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001560 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001561 This gives the physical address where the kernel is loaded.
1562
1563 If kernel is a not relocatable (CONFIG_RELOCATABLE=n) then
1564 bzImage will decompress itself to above physical address and
1565 run from there. Otherwise, bzImage will run from the address where
1566 it has been loaded by the boot loader and will ignore above physical
1567 address.
1568
1569 In normal kdump cases one does not have to set/change this option
1570 as now bzImage can be compiled as a completely relocatable image
1571 (CONFIG_RELOCATABLE=y) and be used to load and run from a different
1572 address. This option is mainly useful for the folks who don't want
1573 to use a bzImage for capturing the crash dump and want to use a
1574 vmlinux instead. vmlinux is not relocatable hence a kernel needs
1575 to be specifically compiled to run from a specific memory area
1576 (normally a reserved region) and this option comes handy.
1577
H. Peter Anvinceefccc2009-05-11 16:12:16 -07001578 So if you are using bzImage for capturing the crash dump,
1579 leave the value here unchanged to 0x1000000 and set
1580 CONFIG_RELOCATABLE=y. Otherwise if you plan to use vmlinux
1581 for capturing the crash dump change this value to start of
1582 the reserved region. In other words, it can be set based on
1583 the "X" value as specified in the "crashkernel=YM@XM"
1584 command line boot parameter passed to the panic-ed
1585 kernel. Please take a look at Documentation/kdump/kdump.txt
1586 for more details about crash dumps.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001587
1588 Usage of bzImage for capturing the crash dump is recommended as
1589 one does not have to build two kernels. Same kernel can be used
1590 as production kernel and capture kernel. Above option should have
1591 gone away after relocatable bzImage support is introduced. But it
1592 is present because there are users out there who continue to use
1593 vmlinux for dump capture. This option should go away down the
1594 line.
1595
1596 Don't change this unless you know what you are doing.
1597
1598config RELOCATABLE
H. Peter Anvin26717802009-05-07 14:19:34 -07001599 bool "Build a relocatable kernel"
1600 default y
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001601 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001602 This builds a kernel image that retains relocation information
1603 so it can be loaded someplace besides the default 1MB.
1604 The relocations tend to make the kernel binary about 10% larger,
1605 but are discarded at runtime.
1606
1607 One use is for the kexec on panic case where the recovery kernel
1608 must live at a different physical address than the primary
1609 kernel.
1610
1611 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
1612 it has been loaded at and the compile time physical address
1613 (CONFIG_PHYSICAL_START) is ignored.
1614
H. Peter Anvin845adf72009-05-05 21:20:51 -07001615# Relocation on x86-32 needs some additional build support
1616config X86_NEED_RELOCS
1617 def_bool y
1618 depends on X86_32 && RELOCATABLE
1619
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001620config PHYSICAL_ALIGN
Jan Beulich6fc108a2010-04-21 15:23:44 +01001621 hex "Alignment value to which kernel should be aligned" if X86_32
H. Peter Anvinceefccc2009-05-11 16:12:16 -07001622 default "0x1000000"
1623 range 0x2000 0x1000000
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001624 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001625 This value puts the alignment restrictions on physical address
1626 where kernel is loaded and run from. Kernel is compiled for an
1627 address which meets above alignment restriction.
1628
1629 If bootloader loads the kernel at a non-aligned address and
1630 CONFIG_RELOCATABLE is set, kernel will move itself to nearest
1631 address aligned to above value and run from there.
1632
1633 If bootloader loads the kernel at a non-aligned address and
1634 CONFIG_RELOCATABLE is not set, kernel will ignore the run time
1635 load address and decompress itself to the address it has been
1636 compiled for and run from there. The address for which kernel is
1637 compiled already meets above alignment restrictions. Hence the
1638 end result is that kernel runs from a physical address meeting
1639 above alignment restrictions.
1640
1641 Don't change this unless you know what you are doing.
1642
1643config HOTPLUG_CPU
Dimitri Sivanich7c13e6a2008-08-11 10:46:46 -05001644 bool "Support for hot-pluggable CPUs"
Ingo Molnar4b19ed92009-01-27 17:47:24 +01001645 depends on SMP && HOTPLUG
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001646 ---help---
Dimitri Sivanich7c13e6a2008-08-11 10:46:46 -05001647 Say Y here to allow turning CPUs off and on. CPUs can be
1648 controlled through /sys/devices/system/cpu.
1649 ( Note: power management support will enable this option
1650 automatically on SMP systems. )
1651 Say N if you want to disable CPU hotplug.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001652
1653config COMPAT_VDSO
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001654 def_bool y
1655 prompt "Compat VDSO support"
Roland McGrathaf65d642008-01-30 13:30:43 +01001656 depends on X86_32 || IA32_EMULATION
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001657 ---help---
Roland McGrathaf65d642008-01-30 13:30:43 +01001658 Map the 32-bit VDSO to the predictable old-style address too.
Randy Dunlape84446d2009-11-10 15:46:52 -08001659
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001660 Say N here if you are running a sufficiently recent glibc
1661 version (2.3.3 or later), to remove the high-mapped
1662 VDSO mapping and to exclusively use the randomized VDSO.
1663
1664 If unsure, say Y.
1665
Tim Bird516cbf32008-08-12 12:52:36 -07001666config CMDLINE_BOOL
1667 bool "Built-in kernel command line"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001668 ---help---
Tim Bird516cbf32008-08-12 12:52:36 -07001669 Allow for specifying boot arguments to the kernel at
1670 build time. On some systems (e.g. embedded ones), it is
1671 necessary or convenient to provide some or all of the
1672 kernel boot arguments with the kernel itself (that is,
1673 to not rely on the boot loader to provide them.)
1674
1675 To compile command line arguments into the kernel,
1676 set this option to 'Y', then fill in the
1677 the boot arguments in CONFIG_CMDLINE.
1678
1679 Systems with fully functional boot loaders (i.e. non-embedded)
1680 should leave this option set to 'N'.
1681
1682config CMDLINE
1683 string "Built-in kernel command string"
1684 depends on CMDLINE_BOOL
1685 default ""
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001686 ---help---
Tim Bird516cbf32008-08-12 12:52:36 -07001687 Enter arguments here that should be compiled into the kernel
1688 image and used at boot time. If the boot loader provides a
1689 command line at boot time, it is appended to this string to
1690 form the full kernel command line, when the system boots.
1691
1692 However, you can use the CONFIG_CMDLINE_OVERRIDE option to
1693 change this behavior.
1694
1695 In most cases, the command line (whether built-in or provided
1696 by the boot loader) should specify the device for the root
1697 file system.
1698
1699config CMDLINE_OVERRIDE
1700 bool "Built-in command line overrides boot loader arguments"
Tim Bird516cbf32008-08-12 12:52:36 -07001701 depends on CMDLINE_BOOL
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001702 ---help---
Tim Bird516cbf32008-08-12 12:52:36 -07001703 Set this option to 'Y' to have the kernel ignore the boot loader
1704 command line, and use ONLY the built-in command line.
1705
1706 This is used to work around broken boot loaders. This should
1707 be set to 'N' under normal conditions.
1708
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001709endmenu
1710
1711config ARCH_ENABLE_MEMORY_HOTPLUG
1712 def_bool y
1713 depends on X86_64 || (X86_32 && HIGHMEM)
1714
Gary Hade35551052008-10-31 10:52:03 -07001715config ARCH_ENABLE_MEMORY_HOTREMOVE
1716 def_bool y
1717 depends on MEMORY_HOTPLUG
1718
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001719config HAVE_ARCH_EARLY_PFN_TO_NID
1720 def_bool X86_64
1721 depends on NUMA
1722
Lee Schermerhorne534c7c2010-05-26 14:44:58 -07001723config USE_PERCPU_NUMA_NODE_ID
1724 def_bool X86_64
1725 depends on NUMA
1726
Bjorn Helgaasda85f862008-11-05 13:37:27 -06001727menu "Power management and ACPI options"
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001728
1729config ARCH_HIBERNATION_HEADER
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001730 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001731 depends on X86_64 && HIBERNATION
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001732
1733source "kernel/power/Kconfig"
1734
1735source "drivers/acpi/Kconfig"
1736
Feng Tangefafc8b2009-08-14 15:23:29 -04001737source "drivers/sfi/Kconfig"
1738
Andi Kleena6b68072008-01-30 13:32:49 +01001739config X86_APM_BOOT
Jan Beulich6fc108a2010-04-21 15:23:44 +01001740 def_bool y
Andi Kleena6b68072008-01-30 13:32:49 +01001741 depends on APM || APM_MODULE
1742
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001743menuconfig APM
1744 tristate "APM (Advanced Power Management) BIOS support"
Ingo Molnarefefa6f2008-07-10 16:09:50 +02001745 depends on X86_32 && PM_SLEEP
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001746 ---help---
1747 APM is a BIOS specification for saving power using several different
1748 techniques. This is mostly useful for battery powered laptops with
1749 APM compliant BIOSes. If you say Y here, the system time will be
1750 reset after a RESUME operation, the /proc/apm device will provide
1751 battery status information, and user-space programs will receive
1752 notification of APM "events" (e.g. battery status change).
1753
1754 If you select "Y" here, you can disable actual use of the APM
1755 BIOS by passing the "apm=off" option to the kernel at boot time.
1756
1757 Note that the APM support is almost completely disabled for
1758 machines with more than one CPU.
1759
1760 In order to use APM, you will need supporting software. For location
Randy Dunlap53471122008-03-12 18:10:51 -04001761 and more information, read <file:Documentation/power/pm.txt> and the
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001762 Battery Powered Linux mini-HOWTO, available from
1763 <http://www.tldp.org/docs.html#howto>.
1764
1765 This driver does not spin down disk drives (see the hdparm(8)
1766 manpage ("man 8 hdparm") for that), and it doesn't turn off
1767 VESA-compliant "green" monitors.
1768
1769 This driver does not support the TI 4000M TravelMate and the ACER
1770 486/DX4/75 because they don't have compliant BIOSes. Many "green"
1771 desktop machines also don't have compliant BIOSes, and this driver
1772 may cause those machines to panic during the boot phase.
1773
1774 Generally, if you don't have a battery in your machine, there isn't
1775 much point in using this driver and you should say N. If you get
1776 random kernel OOPSes or reboots that don't seem to be related to
1777 anything, try disabling/enabling this option (or disabling/enabling
1778 APM in your BIOS).
1779
1780 Some other things you should try when experiencing seemingly random,
1781 "weird" problems:
1782
1783 1) make sure that you have enough swap space and that it is
1784 enabled.
1785 2) pass the "no-hlt" option to the kernel
1786 3) switch on floating point emulation in the kernel and pass
1787 the "no387" option to the kernel
1788 4) pass the "floppy=nodma" option to the kernel
1789 5) pass the "mem=4M" option to the kernel (thereby disabling
1790 all but the first 4 MB of RAM)
1791 6) make sure that the CPU is not over clocked.
1792 7) read the sig11 FAQ at <http://www.bitwizard.nl/sig11/>
1793 8) disable the cache from your BIOS settings
1794 9) install a fan for the video card or exchange video RAM
1795 10) install a better fan for the CPU
1796 11) exchange RAM chips
1797 12) exchange the motherboard.
1798
1799 To compile this driver as a module, choose M here: the
1800 module will be called apm.
1801
1802if APM
1803
1804config APM_IGNORE_USER_SUSPEND
1805 bool "Ignore USER SUSPEND"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001806 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001807 This option will ignore USER SUSPEND requests. On machines with a
1808 compliant APM BIOS, you want to say N. However, on the NEC Versa M
1809 series notebooks, it is necessary to say Y because of a BIOS bug.
1810
1811config APM_DO_ENABLE
1812 bool "Enable PM at boot time"
1813 ---help---
1814 Enable APM features at boot time. From page 36 of the APM BIOS
1815 specification: "When disabled, the APM BIOS does not automatically
1816 power manage devices, enter the Standby State, enter the Suspend
1817 State, or take power saving steps in response to CPU Idle calls."
1818 This driver will make CPU Idle calls when Linux is idle (unless this
1819 feature is turned off -- see "Do CPU IDLE calls", below). This
1820 should always save battery power, but more complicated APM features
1821 will be dependent on your BIOS implementation. You may need to turn
1822 this option off if your computer hangs at boot time when using APM
1823 support, or if it beeps continuously instead of suspending. Turn
1824 this off if you have a NEC UltraLite Versa 33/C or a Toshiba
1825 T400CDT. This is off by default since most machines do fine without
1826 this feature.
1827
1828config APM_CPU_IDLE
1829 bool "Make CPU Idle calls when idle"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001830 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001831 Enable calls to APM CPU Idle/CPU Busy inside the kernel's idle loop.
1832 On some machines, this can activate improved power savings, such as
1833 a slowed CPU clock rate, when the machine is idle. These idle calls
1834 are made after the idle loop has run for some length of time (e.g.,
1835 333 mS). On some machines, this will cause a hang at boot time or
1836 whenever the CPU becomes idle. (On machines with more than one CPU,
1837 this option does nothing.)
1838
1839config APM_DISPLAY_BLANK
1840 bool "Enable console blanking using APM"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001841 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001842 Enable console blanking using the APM. Some laptops can use this to
1843 turn off the LCD backlight when the screen blanker of the Linux
1844 virtual console blanks the screen. Note that this is only used by
1845 the virtual console screen blanker, and won't turn off the backlight
1846 when using the X Window system. This also doesn't have anything to
1847 do with your VESA-compliant power-saving monitor. Further, this
1848 option doesn't work for all laptops -- it might not turn off your
1849 backlight at all, or it might print a lot of errors to the console,
1850 especially if you are using gpm.
1851
1852config APM_ALLOW_INTS
1853 bool "Allow interrupts during APM BIOS calls"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001854 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001855 Normally we disable external interrupts while we are making calls to
1856 the APM BIOS as a measure to lessen the effects of a badly behaving
1857 BIOS implementation. The BIOS should reenable interrupts if it
1858 needs to. Unfortunately, some BIOSes do not -- especially those in
1859 many of the newer IBM Thinkpads. If you experience hangs when you
1860 suspend, try setting this to Y. Otherwise, say N.
1861
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001862endif # APM
1863
1864source "arch/x86/kernel/cpu/cpufreq/Kconfig"
1865
1866source "drivers/cpuidle/Kconfig"
1867
Andy Henroid27471fd2008-10-09 11:45:22 -07001868source "drivers/idle/Kconfig"
1869
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001870endmenu
1871
1872
1873menu "Bus options (PCI etc.)"
1874
1875config PCI
Ingo Molnar1ac97012008-05-19 14:10:14 +02001876 bool "PCI support"
Adrian Bunk1c858082008-01-30 13:32:32 +01001877 default y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001878 select ARCH_SUPPORTS_MSI if (X86_LOCAL_APIC && X86_IO_APIC)
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001879 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001880 Find out whether you have a PCI motherboard. PCI is the name of a
1881 bus system, i.e. the way the CPU talks to the other stuff inside
1882 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
1883 VESA. If you have PCI, say Y, otherwise N.
1884
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001885choice
1886 prompt "PCI access mode"
Ingo Molnarefefa6f2008-07-10 16:09:50 +02001887 depends on X86_32 && PCI
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001888 default PCI_GOANY
1889 ---help---
1890 On PCI systems, the BIOS can be used to detect the PCI devices and
1891 determine their configuration. However, some old PCI motherboards
1892 have BIOS bugs and may crash if this is done. Also, some embedded
1893 PCI-based systems don't have any BIOS at all. Linux can also try to
1894 detect the PCI hardware directly without using the BIOS.
1895
1896 With this option, you can specify how Linux should detect the
1897 PCI devices. If you choose "BIOS", the BIOS will be used,
1898 if you choose "Direct", the BIOS won't be used, and if you
1899 choose "MMConfig", then PCI Express MMCONFIG will be used.
1900 If you choose "Any", the kernel will try MMCONFIG, then the
1901 direct access method and falls back to the BIOS if that doesn't
1902 work. If unsure, go with the default, which is "Any".
1903
1904config PCI_GOBIOS
1905 bool "BIOS"
1906
1907config PCI_GOMMCONFIG
1908 bool "MMConfig"
1909
1910config PCI_GODIRECT
1911 bool "Direct"
1912
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07001913config PCI_GOOLPC
1914 bool "OLPC"
1915 depends on OLPC
1916
Andres Salomon2bdd1b02008-06-05 14:14:41 -07001917config PCI_GOANY
1918 bool "Any"
1919
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001920endchoice
1921
1922config PCI_BIOS
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001923 def_bool y
Ingo Molnarefefa6f2008-07-10 16:09:50 +02001924 depends on X86_32 && PCI && (PCI_GOBIOS || PCI_GOANY)
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001925
1926# x86-64 doesn't support PCI BIOS access from long mode so always go direct.
1927config PCI_DIRECT
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001928 def_bool y
Ingo Molnarefefa6f2008-07-10 16:09:50 +02001929 depends on PCI && (X86_64 || (PCI_GODIRECT || PCI_GOANY || PCI_GOOLPC))
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001930
1931config PCI_MMCONFIG
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001932 def_bool y
Feng Tang5f0db7a2009-08-14 15:37:50 -04001933 depends on X86_32 && PCI && (ACPI || SFI) && (PCI_GOMMCONFIG || PCI_GOANY)
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001934
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07001935config PCI_OLPC
Andres Salomon2bdd1b02008-06-05 14:14:41 -07001936 def_bool y
1937 depends on PCI && OLPC && (PCI_GOOLPC || PCI_GOANY)
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07001938
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001939config PCI_DOMAINS
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001940 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001941 depends on PCI
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001942
1943config PCI_MMCONFIG
1944 bool "Support mmconfig PCI config space access"
1945 depends on X86_64 && PCI && ACPI
1946
Ira W. Snyder3f6ea842010-04-01 11:43:30 -07001947config PCI_CNB20LE_QUIRK
1948 bool "Read CNB20LE Host Bridge Windows"
1949 depends on PCI
1950 help
1951 Read the PCI windows out of the CNB20LE host bridge. This allows
1952 PCI hotplug to work on systems with the CNB20LE chipset which do
1953 not have ACPI.
1954
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001955config DMAR
1956 bool "Support for DMA Remapping Devices (EXPERIMENTAL)"
David Woodhouse4cf2e752009-02-11 17:23:43 +00001957 depends on PCI_MSI && ACPI && EXPERIMENTAL
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001958 help
1959 DMA remapping (DMAR) devices support enables independent address
1960 translations for Direct Memory Access (DMA) from devices.
1961 These DMA remapping devices are reported via ACPI tables
1962 and include PCI device scope covered by these DMA
1963 remapping devices.
1964
Kyle McMartin0cd5c3c2009-02-04 14:29:19 -08001965config DMAR_DEFAULT_ON
Kyle McMartinf6be37f2009-02-26 12:57:56 -05001966 def_bool y
Kyle McMartin0cd5c3c2009-02-04 14:29:19 -08001967 prompt "Enable DMA Remapping Devices by default"
1968 depends on DMAR
1969 help
1970 Selecting this option will enable a DMAR device at boot time if
1971 one is found. If this option is not selected, DMAR support can
1972 be enabled by passing intel_iommu=on to the kernel. It is
1973 recommended you say N here while the DMAR code remains
1974 experimental.
1975
David Woodhouse62edf5d2009-07-04 10:59:46 +01001976config DMAR_BROKEN_GFX_WA
Jan Beulich6fc108a2010-04-21 15:23:44 +01001977 bool "Workaround broken graphics drivers (going away soon)"
David Woodhouse0c02a202009-09-19 09:37:23 -07001978 depends on DMAR && BROKEN
David Woodhouse62edf5d2009-07-04 10:59:46 +01001979 ---help---
1980 Current Graphics drivers tend to use physical address
1981 for DMA and avoid using DMA APIs. Setting this config
1982 option permits the IOMMU driver to set a unity map for
1983 all the OS-visible memory. Hence the driver can continue
1984 to use physical addresses for DMA, at least until this
1985 option is removed in the 2.6.32 kernel.
1986
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001987config DMAR_FLOPPY_WA
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001988 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001989 depends on DMAR
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001990 ---help---
David Woodhousec7ab48d2009-06-26 19:10:36 +01001991 Floppy disk drivers are known to bypass DMA API calls
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001992 thereby failing to work when IOMMU is enabled. This
1993 workaround will setup a 1:1 mapping for the first
David Woodhousec7ab48d2009-06-26 19:10:36 +01001994 16MiB to make floppy (an ISA device) work.
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001995
Suresh Siddha9fa8c482008-07-10 11:17:00 -07001996config INTR_REMAP
1997 bool "Support for Interrupt Remapping (EXPERIMENTAL)"
1998 depends on X86_64 && X86_IO_APIC && PCI_MSI && ACPI && EXPERIMENTAL
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001999 ---help---
2000 Supports Interrupt remapping for IO-APIC and MSI devices.
2001 To use x2apic mode in the CPU's which support x2APIC enhancements or
2002 to support platforms with CPU's having > 8 bit APIC ID, say Y.
Suresh Siddha9fa8c482008-07-10 11:17:00 -07002003
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002004source "drivers/pci/pcie/Kconfig"
2005
2006source "drivers/pci/Kconfig"
2007
2008# x86_64 have no ISA slots, but do have ISA-style DMA.
2009config ISA_DMA_API
Harvey Harrison3c2362e2008-01-30 13:31:03 +01002010 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002011
2012if X86_32
2013
2014config ISA
2015 bool "ISA support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002016 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002017 Find out whether you have ISA slots on your motherboard. ISA is the
2018 name of a bus system, i.e. the way the CPU talks to the other stuff
2019 inside your box. Other bus systems are PCI, EISA, MicroChannel
2020 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
2021 newer boards don't support it. If you have ISA, say Y, otherwise N.
2022
2023config EISA
2024 bool "EISA support"
2025 depends on ISA
2026 ---help---
2027 The Extended Industry Standard Architecture (EISA) bus was
2028 developed as an open alternative to the IBM MicroChannel bus.
2029
2030 The EISA bus provided some of the features of the IBM MicroChannel
2031 bus while maintaining backward compatibility with cards made for
2032 the older ISA bus. The EISA bus saw limited use between 1988 and
2033 1995 when it was made obsolete by the PCI bus.
2034
2035 Say Y here if you are building a kernel for an EISA-based machine.
2036
2037 Otherwise, say N.
2038
2039source "drivers/eisa/Kconfig"
2040
2041config MCA
Ingo Molnar72ee6eb2009-01-27 16:57:49 +01002042 bool "MCA support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002043 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002044 MicroChannel Architecture is found in some IBM PS/2 machines and
2045 laptops. It is a bus system similar to PCI or ISA. See
2046 <file:Documentation/mca.txt> (and especially the web page given
2047 there) before attempting to build an MCA bus kernel.
2048
2049source "drivers/mca/Kconfig"
2050
2051config SCx200
2052 tristate "NatSemi SCx200 support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002053 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002054 This provides basic support for National Semiconductor's
2055 (now AMD's) Geode processors. The driver probes for the
2056 PCI-IDs of several on-chip devices, so its a good dependency
2057 for other scx200_* drivers.
2058
2059 If compiled as a module, the driver is named scx200.
2060
2061config SCx200HR_TIMER
2062 tristate "NatSemi SCx200 27MHz High-Resolution Timer Support"
John Stultz592913e2010-07-13 17:56:20 -07002063 depends on SCx200
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002064 default y
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002065 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002066 This driver provides a clocksource built upon the on-chip
2067 27MHz high-resolution timer. Its also a workaround for
2068 NSC Geode SC-1100's buggy TSC, which loses time when the
2069 processor goes idle (as is done by the scheduler). The
2070 other workaround is idle=poll boot option.
2071
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07002072config OLPC
2073 bool "One Laptop Per Child support"
Andres Salomon3c554942009-12-14 18:00:36 -08002074 select GPIOLIB
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002075 ---help---
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07002076 Add support for detecting the unique features of the OLPC
2077 XO hardware.
2078
Andres Salomonfd699c72010-06-18 17:46:53 -04002079config OLPC_OPENFIRMWARE
2080 bool "Support for OLPC's Open Firmware"
2081 depends on !X86_64 && !X86_PAE
2082 default y if OLPC
2083 help
2084 This option adds support for the implementation of Open Firmware
2085 that is used on the OLPC XO-1 Children's Machine.
2086 If unsure, say N here.
2087
Sam Ravnborgbc0120f2007-11-06 23:10:39 +01002088endif # X86_32
2089
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002090config K8_NB
2091 def_bool y
Borislav Petkov0e152cd2010-03-12 15:43:03 +01002092 depends on CPU_SUP_AMD && PCI
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002093
2094source "drivers/pcmcia/Kconfig"
2095
2096source "drivers/pci/hotplug/Kconfig"
2097
2098endmenu
2099
2100
2101menu "Executable file formats / Emulations"
2102
2103source "fs/Kconfig.binfmt"
2104
2105config IA32_EMULATION
2106 bool "IA32 Emulation"
2107 depends on X86_64
Roland McGratha97f52e2008-01-30 13:31:55 +01002108 select COMPAT_BINFMT_ELF
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002109 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002110 Include code to run 32-bit programs under a 64-bit kernel. You should
2111 likely turn this on, unless you're 100% sure that you don't have any
2112 32-bit programs left.
2113
2114config IA32_AOUT
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002115 tristate "IA32 a.out support"
2116 depends on IA32_EMULATION
2117 ---help---
2118 Support old a.out binaries in the 32bit emulation.
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002119
2120config COMPAT
Harvey Harrison3c2362e2008-01-30 13:31:03 +01002121 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002122 depends on IA32_EMULATION
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002123
2124config COMPAT_FOR_U64_ALIGNMENT
2125 def_bool COMPAT
2126 depends on X86_64
2127
2128config SYSVIPC_COMPAT
Harvey Harrison3c2362e2008-01-30 13:31:03 +01002129 def_bool y
Alexey Dobriyanb8992192008-09-14 13:44:41 +04002130 depends on COMPAT && SYSVIPC
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002131
2132endmenu
2133
2134
Keith Packarde5beae12008-11-03 18:21:45 +01002135config HAVE_ATOMIC_IOMAP
2136 def_bool y
2137 depends on X86_32
2138
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002139source "net/Kconfig"
2140
2141source "drivers/Kconfig"
2142
2143source "drivers/firmware/Kconfig"
2144
2145source "fs/Kconfig"
2146
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002147source "arch/x86/Kconfig.debug"
2148
2149source "security/Kconfig"
2150
2151source "crypto/Kconfig"
2152
Avi Kivityedf88412007-12-16 11:02:48 +02002153source "arch/x86/kvm/Kconfig"
2154
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002155source "lib/Kconfig"