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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"
Sam Ravnborgdaa93fa2007-11-12 20:54:30 +01008 help
9 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
Ingo Molnara5574cf2008-05-05 23:19:50 +020021 select HAVE_UNSTABLE_SCHED_CLOCK
Sam Ravnborgec7748b2008-02-09 10:46:40 +010022 select HAVE_IDE
Mathieu Desnoyers42d4b832008-02-02 15:10:34 -050023 select HAVE_OPROFILE
Rik van Riel28b2ee22008-07-23 21:27:05 -070024 select HAVE_IOREMAP_PROT
Nick Piggin8174c432008-07-25 19:45:24 -070025 select HAVE_GET_USER_PAGES_FAST
Mathieu Desnoyers3f550092008-02-02 15:10:35 -050026 select HAVE_KPROBES
Ingo Molnar1f972762008-07-26 13:52:50 +020027 select ARCH_WANT_OPTIONAL_GPIOLIB
Ananth N Mavinakayanahalli9edddaa2008-03-04 14:28:37 -080028 select HAVE_KRETPROBES
Steven Rostedt677aa9f2008-05-17 00:01:36 -040029 select HAVE_DYNAMIC_FTRACE
Arnaldo Carvalho de Melo16444a82008-05-12 21:20:42 +020030 select HAVE_FTRACE
Randy Dunlap1a4e3f82008-02-20 09:20:08 -080031 select HAVE_KVM if ((X86_32 && !X86_VOYAGER && !X86_VISWS && !X86_NUMAQ) || X86_64)
Ingo Molnarfcbc04c2008-04-21 13:39:53 +020032 select HAVE_ARCH_KGDB if !X86_VOYAGER
Dmitry Baryshkov323ec002008-06-29 14:19:31 +040033 select HAVE_GENERIC_DMA_COHERENT if X86_32
Johannes Berg58340a02008-07-25 01:45:33 -070034 select HAVE_EFFICIENT_UNALIGNED_ACCESS
Balbir Singh7d8330a2008-02-10 12:46:28 +053035
Sam Ravnborg73531902008-05-25 23:03:18 +020036config ARCH_DEFCONFIG
Sam Ravnborgb9b39bf2008-04-29 12:48:15 +020037 string
Sam Ravnborg73531902008-05-25 23:03:18 +020038 default "arch/x86/configs/i386_defconfig" if X86_32
39 default "arch/x86/configs/x86_64_defconfig" if X86_64
Sam Ravnborgb9b39bf2008-04-29 12:48:15 +020040
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010041
Nick Piggin95c354f2008-01-30 13:31:20 +010042config GENERIC_LOCKBREAK
Nick Piggin314cdbe2008-01-30 13:31:21 +010043 def_bool n
Nick Piggin95c354f2008-01-30 13:31:20 +010044
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010045config GENERIC_TIME
Harvey Harrison3c2362e2008-01-30 13:31:03 +010046 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010047
48config GENERIC_CMOS_UPDATE
Harvey Harrison3c2362e2008-01-30 13:31:03 +010049 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010050
51config CLOCKSOURCE_WATCHDOG
Harvey Harrison3c2362e2008-01-30 13:31:03 +010052 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010053
54config GENERIC_CLOCKEVENTS
Harvey Harrison3c2362e2008-01-30 13:31:03 +010055 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010056
57config GENERIC_CLOCKEVENTS_BROADCAST
Harvey Harrison3c2362e2008-01-30 13:31:03 +010058 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010059 depends on X86_64 || (X86_32 && X86_LOCAL_APIC)
60
61config LOCKDEP_SUPPORT
Harvey Harrison3c2362e2008-01-30 13:31:03 +010062 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010063
64config STACKTRACE_SUPPORT
Harvey Harrison3c2362e2008-01-30 13:31:03 +010065 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010066
Heiko Carstensaa7d9352008-02-01 17:45:14 +010067config HAVE_LATENCYTOP_SUPPORT
68 def_bool y
69
Christoph Lameter1f842602008-01-07 23:20:30 -080070config FAST_CMPXCHG_LOCAL
71 bool
72 default y
73
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010074config MMU
Harvey Harrison3c2362e2008-01-30 13:31:03 +010075 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010076
77config ZONE_DMA
Harvey Harrison3c2362e2008-01-30 13:31:03 +010078 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010079
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010080config SBUS
81 bool
82
83config GENERIC_ISA_DMA
Harvey Harrison3c2362e2008-01-30 13:31:03 +010084 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010085
86config GENERIC_IOMAP
Harvey Harrison3c2362e2008-01-30 13:31:03 +010087 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010088
89config GENERIC_BUG
Harvey Harrison3c2362e2008-01-30 13:31:03 +010090 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010091 depends on BUG
92
93config GENERIC_HWEIGHT
Harvey Harrison3c2362e2008-01-30 13:31:03 +010094 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010095
Florian Fainellia6082952008-01-30 13:33:35 +010096config GENERIC_GPIO
97 def_bool n
98
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010099config ARCH_MAY_HAVE_PC_FDC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100100 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100101
Sam Ravnborg1032c0b2007-11-06 21:35:08 +0100102config RWSEM_GENERIC_SPINLOCK
103 def_bool !X86_XADD
104
105config RWSEM_XCHGADD_ALGORITHM
106 def_bool X86_XADD
107
108config ARCH_HAS_ILOG2_U32
109 def_bool n
110
111config ARCH_HAS_ILOG2_U64
112 def_bool n
113
Venki Pallipadia6869cc2008-02-08 17:05:44 -0800114config ARCH_HAS_CPU_IDLE_WAIT
115 def_bool y
116
Sam Ravnborg1032c0b2007-11-06 21:35:08 +0100117config GENERIC_CALIBRATE_DELAY
118 def_bool y
119
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100120config GENERIC_TIME_VSYSCALL
121 bool
122 default X86_64
123
venkatesh.pallipadi@intel.com9a0b8412008-01-31 17:35:06 -0800124config ARCH_HAS_CPU_RELAX
125 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100126
Pekka Enberg1b27d052008-04-28 02:12:22 -0700127config ARCH_HAS_CACHE_LINE_SIZE
128 def_bool y
129
Mike Travisdd5af902008-01-30 13:33:32 +0100130config HAVE_SETUP_PER_CPU_AREA
Mike Travis23ca4bb2008-05-12 21:21:12 +0200131 def_bool X86_64_SMP || (X86_SMP && !X86_VOYAGER)
travis@sgi.comb32ef632008-01-30 13:32:51 +0100132
Mike Travis9f0e8d02008-04-04 18:11:01 -0700133config HAVE_CPUMASK_OF_CPU_MAP
134 def_bool X86_64_SMP
135
Johannes Berg801e4062007-12-08 02:12:39 +0100136config ARCH_HIBERNATION_POSSIBLE
137 def_bool y
138 depends on !SMP || !X86_VOYAGER
139
Johannes Bergf4cb5702007-12-08 02:14:00 +0100140config ARCH_SUSPEND_POSSIBLE
141 def_bool y
142 depends on !X86_VOYAGER
143
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100144config ZONE_DMA32
145 bool
146 default X86_64
147
148config ARCH_POPULATES_NODE_MAP
149 def_bool y
150
151config AUDIT_ARCH
152 bool
153 default X86_64
154
David Howellsb0b933c2008-02-08 04:19:27 -0800155config ARCH_SUPPORTS_AOUT
156 def_bool y
157
Ingo Molnar765c68b2008-04-09 11:03:37 +0200158config ARCH_SUPPORTS_OPTIMIZED_INLINING
159 def_bool y
160
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100161# Use the generic interrupt handling code in kernel/irq/:
162config GENERIC_HARDIRQS
163 bool
164 default y
165
166config GENERIC_IRQ_PROBE
167 bool
168 default y
169
170config GENERIC_PENDING_IRQ
171 bool
172 depends on GENERIC_HARDIRQS && SMP
173 default y
174
175config X86_SMP
176 bool
Sam Ravnborg6b0c3d42008-01-30 13:32:27 +0100177 depends on SMP && ((X86_32 && !X86_VOYAGER) || X86_64)
Jens Axboe3b16cf82008-06-26 11:21:54 +0200178 select USE_GENERIC_SMP_HELPERS
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100179 default y
180
Sam Ravnborg6b0c3d42008-01-30 13:32:27 +0100181config X86_32_SMP
182 def_bool y
183 depends on X86_32 && SMP
184
185config X86_64_SMP
186 def_bool y
187 depends on X86_64 && SMP
188
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100189config X86_HT
190 bool
Adrian Bunkee0011a2007-12-04 17:19:07 +0100191 depends on SMP
Ingo Molnarefefa6f2008-07-10 16:09:50 +0200192 depends on (X86_32 && !X86_VOYAGER) || X86_64
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100193 default y
194
195config X86_BIOS_REBOOT
196 bool
Ingo Molnar31ac4092008-07-10 13:31:04 +0200197 depends on !X86_VOYAGER
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100198 default y
199
200config X86_TRAMPOLINE
201 bool
Pavel Macheke44b7b72008-04-10 23:28:10 +0200202 depends on X86_SMP || (X86_VOYAGER && SMP) || (64BIT && ACPI_SLEEP)
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100203 default y
204
205config KTIME_SCALAR
206 def_bool X86_32
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100207source "init/Kconfig"
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100208
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100209menu "Processor type and features"
210
211source "kernel/time/Kconfig"
212
213config SMP
214 bool "Symmetric multi-processing support"
215 ---help---
216 This enables support for systems with more than one CPU. If you have
217 a system with only one CPU, like most personal computers, say N. If
218 you have a system with more than one CPU, say Y.
219
220 If you say N here, the kernel will run on single and multiprocessor
221 machines, but will use only one CPU of a multiprocessor machine. If
222 you say Y here, the kernel will run on many, but not all,
223 singleprocessor machines. On a singleprocessor machine, the kernel
224 will run faster if you say N here.
225
226 Note that if you say Y here and choose architecture "586" or
227 "Pentium" under "Processor family", the kernel will not work on 486
228 architectures. Similarly, multiprocessor kernels for the "PPro"
229 architecture may not work on all Pentium based boards.
230
231 People using multiprocessor machines who say Y here should also say
232 Y to "Enhanced Real Time Clock Support", below. The "Advanced Power
233 Management" code will be disabled if you say Y here.
234
Adrian Bunk03502fa2008-02-03 15:50:21 +0200235 See also <file:Documentation/i386/IO-APIC.txt>,
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100236 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
237 <http://www.tldp.org/docs.html#howto>.
238
239 If you don't know what to do here, say N.
240
Yinghai Lu6695c852008-06-19 12:13:09 -0700241config X86_FIND_SMP_CONFIG
242 def_bool y
Ingo Molnar1b84e1c2008-07-10 15:55:27 +0200243 depends on X86_MPPARSE || X86_VOYAGER
Yinghai Lu6695c852008-06-19 12:13:09 -0700244
245if ACPI
246config X86_MPPARSE
247 def_bool y
248 bool "Enable MPS table"
Ingo Molnar5ab74722008-07-10 14:42:03 +0200249 depends on X86_LOCAL_APIC
Yinghai Lu6695c852008-06-19 12:13:09 -0700250 help
251 For old smp systems that do not have proper acpi support. Newer systems
252 (esp with 64bit cpus) with acpi support, MADT and DSDT will override it
253endif
254
255if !ACPI
256config X86_MPPARSE
257 def_bool y
Ingo Molnar5ab74722008-07-10 14:42:03 +0200258 depends on X86_LOCAL_APIC
Yinghai Lu6695c852008-06-19 12:13:09 -0700259endif
260
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100261choice
262 prompt "Subarchitecture Type"
263 default X86_PC
264
265config X86_PC
266 bool "PC-compatible"
267 help
268 Choose this option if your computer is a standard PC or compatible.
269
270config X86_ELAN
271 bool "AMD Elan"
272 depends on X86_32
273 help
274 Select this for an AMD Elan processor.
275
276 Do not use this option for K6/Athlon/Opteron processors!
277
278 If unsure, choose "PC-compatible" instead.
279
280config X86_VOYAGER
281 bool "Voyager (NCR)"
Ingo Molnar1ac97012008-05-19 14:10:14 +0200282 depends on X86_32 && (SMP || BROKEN) && !PCI
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100283 help
284 Voyager is an MCA-based 32-way capable SMP architecture proprietary
285 to NCR Corp. Machine classes 345x/35xx/4100/51xx are Voyager-based.
286
287 *** WARNING ***
288
289 If you do not specifically know you have a Voyager based machine,
290 say N here, otherwise the kernel you build will not be bootable.
291
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100292config X86_GENERICARCH
Yinghai Lud49c4282008-06-08 18:31:54 -0700293 bool "Generic architecture"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100294 depends on X86_32
295 help
Yinghai Lud49c4282008-06-08 18:31:54 -0700296 This option compiles in the NUMAQ, Summit, bigsmp, ES7000, default
297 subarchitectures. It is intended for a generic binary kernel.
298 if you select them all, kernel will probe it one by one. and will
299 fallback to default.
300
301if X86_GENERICARCH
302
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100303config X86_NUMAQ
304 bool "NUMAQ (IBM/Sequent)"
Ingo Molnar3de352b2008-07-08 11:14:58 +0200305 depends on SMP && X86_32 && PCI && X86_MPPARSE
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100306 select NUMA
307 help
Yinghai Lud49c4282008-06-08 18:31:54 -0700308 This option is used for getting Linux to run on a NUMAQ (IBM/Sequent)
309 NUMA multiquad box. This changes the way that processors are
310 bootstrapped, and uses Clustered Logical APIC addressing mode instead
311 of Flat Logical. You will need a new lynxer.elf file to flash your
312 firmware with - send email to <Martin.Bligh@us.ibm.com>.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100313
314config X86_SUMMIT
315 bool "Summit/EXA (IBM x440)"
316 depends on X86_32 && SMP
317 help
318 This option is needed for IBM systems that use the Summit/EXA chipset.
319 In particular, it is needed for the x440.
320
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100321config X86_ES7000
322 bool "Support for Unisys ES7000 IA32 series"
323 depends on X86_32 && SMP
324 help
325 Support for Unisys ES7000 systems. Say 'Y' here if this kernel is
326 supposed to run on an IA32-based Unisys ES7000 system.
Yinghai Lud49c4282008-06-08 18:31:54 -0700327
328config X86_BIGSMP
329 bool "Support for big SMP systems with more than 8 CPUs"
330 depends on X86_32 && SMP
331 help
332 This option is needed for the systems that have more than 8 CPUs
333 and if the system is not of any sub-arch type above.
334
335endif
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100336
337config X86_VSMP
338 bool "Support for ScaleMP vSMP"
Glauber Costa96597fd2008-02-11 17:16:04 -0200339 select PARAVIRT
Ingo Molnara6784ad2008-07-10 12:21:58 +0200340 depends on X86_64 && PCI
Glauber Costa96597fd2008-02-11 17:16:04 -0200341 help
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100342 Support for ScaleMP vSMP systems. Say 'Y' here if this kernel is
343 supposed to run on these EM64T-based machines. Only choose this option
344 if you have one of these machines.
345
346endchoice
347
Ingo Molnar1b84e1c2008-07-10 15:55:27 +0200348config X86_VISWS
349 bool "SGI 320/540 (Visual Workstation)"
Ingo Molnar39415a42008-07-10 20:06:30 +0200350 depends on X86_32 && PCI && !X86_VOYAGER && X86_MPPARSE && PCI_GODIRECT
Ingo Molnar1b84e1c2008-07-10 15:55:27 +0200351 help
352 The SGI Visual Workstation series is an IA32-based workstation
353 based on SGI systems chips with some legacy PC hardware attached.
354
355 Say Y here to create a kernel to run on the SGI 320 or 540.
356
357 A kernel compiled for the Visual Workstation will run on general
358 PCs as well. See <file:Documentation/sgi-visws.txt> for details.
359
Ingo Molnar1f972762008-07-26 13:52:50 +0200360config X86_RDC321X
361 bool "RDC R-321x SoC"
362 depends on X86_32
363 select M486
364 select X86_REBOOTFIXUPS
365 help
366 This option is needed for RDC R-321x system-on-chip, also known
367 as R-8610-(G).
368 If you don't have one of these chips, you should say N here.
369
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100370config SCHED_NO_NO_OMIT_FRAME_POINTER
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100371 def_bool y
372 prompt "Single-depth WCHAN output"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100373 depends on X86_32
374 help
375 Calculate simpler /proc/<PID>/wchan values. If this option
376 is disabled then wchan values will recurse back to the
377 caller function. This provides more accurate wchan values,
378 at the expense of slightly more scheduling overhead.
379
380 If in doubt, say "Y".
381
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100382menuconfig PARAVIRT_GUEST
383 bool "Paravirtualized guest support"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100384 help
385 Say Y here to get to see options related to running Linux under
386 various hypervisors. This option alone does not add any kernel code.
387
388 If you say N, all options in this submenu will be skipped and disabled.
389
390if PARAVIRT_GUEST
391
392source "arch/x86/xen/Kconfig"
393
394config VMI
395 bool "VMI Guest support"
396 select PARAVIRT
Eduardo Pereira Habkost42d545c2008-01-30 13:33:32 +0100397 depends on X86_32
Ingo Molnarefefa6f2008-07-10 16:09:50 +0200398 depends on !X86_VOYAGER
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100399 help
400 VMI provides a paravirtualized interface to the VMware ESX server
401 (it could be used by other hypervisors in theory too, but is not
402 at the moment), by linking the kernel to a GPL-ed ROM module
403 provided by the hypervisor.
404
Glauber de Oliveira Costa790c73f2008-02-15 17:52:48 -0200405config KVM_CLOCK
406 bool "KVM paravirtualized clock"
407 select PARAVIRT
Gerd Hoffmannf6e16d52008-06-03 16:17:32 +0200408 select PARAVIRT_CLOCK
Ingo Molnarefefa6f2008-07-10 16:09:50 +0200409 depends on !X86_VOYAGER
Glauber de Oliveira Costa790c73f2008-02-15 17:52:48 -0200410 help
411 Turning on this option will allow you to run a paravirtualized clock
412 when running over the KVM hypervisor. Instead of relying on a PIT
413 (or probably other) emulation by the underlying device model, the host
414 provides the guest with timing infrastructure such as time of day, and
415 system time
416
Marcelo Tosatti0cf1bfd2008-02-22 12:21:36 -0500417config KVM_GUEST
418 bool "KVM Guest support"
419 select PARAVIRT
Ingo Molnarefefa6f2008-07-10 16:09:50 +0200420 depends on !X86_VOYAGER
Marcelo Tosatti0cf1bfd2008-02-22 12:21:36 -0500421 help
422 This option enables various optimizations for running under the KVM
423 hypervisor.
424
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100425source "arch/x86/lguest/Kconfig"
426
Eduardo Pereira Habkoste61bd942008-01-30 13:33:32 +0100427config PARAVIRT
428 bool "Enable paravirtualization code"
Ingo Molnarefefa6f2008-07-10 16:09:50 +0200429 depends on !X86_VOYAGER
Eduardo Pereira Habkoste61bd942008-01-30 13:33:32 +0100430 help
431 This changes the kernel so it can modify itself when it is run
432 under a hypervisor, potentially improving performance significantly
433 over full virtualization. However, when run without a hypervisor
434 the kernel is theoretically slower and slightly larger.
435
Gerd Hoffmann7af192c2008-06-03 16:17:29 +0200436config PARAVIRT_CLOCK
437 bool
438 default n
439
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100440endif
441
Jeremy Fitzhardinge97349132008-06-25 00:19:14 -0400442config PARAVIRT_DEBUG
443 bool "paravirt-ops debugging"
444 depends on PARAVIRT && DEBUG_KERNEL
445 help
446 Enable to debug paravirt_ops internals. Specifically, BUG if
447 a paravirt_op is missing when it is called.
448
Yinghai Lu03273182008-04-18 17:49:15 -0700449config MEMTEST
450 bool "Memtest"
Yinghai Luc64df702008-03-21 18:56:19 -0700451 help
452 This option adds a kernel parameter 'memtest', which allows memtest
Yinghai Lu03273182008-04-18 17:49:15 -0700453 to be set.
454 memtest=0, mean disabled; -- default
455 memtest=1, mean do 1 test pattern;
456 ...
457 memtest=4, mean do 4 test patterns.
Thomas Gleixneraba37282008-07-15 14:48:48 +0200458 If you are unsure how to answer this question, answer N.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100459
460config X86_SUMMIT_NUMA
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100461 def_bool y
Yinghai Lu0699eae2008-06-17 15:39:01 -0700462 depends on X86_32 && NUMA && X86_GENERICARCH
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100463
464config X86_CYCLONE_TIMER
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100465 def_bool y
Yinghai Lu0699eae2008-06-17 15:39:01 -0700466 depends on X86_GENERICARCH
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100467
468config ES7000_CLUSTERED_APIC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100469 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100470 depends on SMP && X86_ES7000 && MPENTIUMIII
471
472source "arch/x86/Kconfig.cpu"
473
474config HPET_TIMER
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100475 def_bool X86_64
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100476 prompt "HPET Timer Support" if X86_32
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100477 help
478 Use the IA-PC HPET (High Precision Event Timer) to manage
479 time in preference to the PIT and RTC, if a HPET is
480 present.
481 HPET is the next generation timer replacing legacy 8254s.
482 The HPET provides a stable time base on SMP
483 systems, unlike the TSC, but it is more expensive to access,
484 as it is off-chip. You can find the HPET spec at
485 <http://www.intel.com/hardwaredesign/hpetspec.htm>.
486
487 You can safely choose Y here. However, HPET will only be
488 activated if the platform and the BIOS support this feature.
489 Otherwise the 8254 will be used for timing services.
490
491 Choose N to continue using the legacy 8254 timer.
492
493config HPET_EMULATE_RTC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100494 def_bool y
Bernhard Walle9d8af782008-02-06 01:38:52 -0800495 depends on HPET_TIMER && (RTC=y || RTC=m || RTC_DRV_CMOS=m || RTC_DRV_CMOS=y)
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100496
497# Mark as embedded because too many people got it wrong.
498# The code disables itself when not needed.
Thomas Petazzoni7ae93922008-04-28 02:14:14 -0700499config DMI
500 default y
501 bool "Enable DMI scanning" if EMBEDDED
502 help
503 Enabled scanning of DMI to identify machine quirks. Say Y
504 here unless you have verified that your setup is not
505 affected by entries in the DMI blacklist. Required by PNP
506 BIOS code.
507
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100508config GART_IOMMU
509 bool "GART IOMMU support" if EMBEDDED
510 default y
511 select SWIOTLB
512 select AGP
513 depends on X86_64 && PCI
514 help
515 Support for full DMA access of devices with 32bit memory access only
516 on systems with more than 3GB. This is usually needed for USB,
517 sound, many IDE/SATA chipsets and some other devices.
518 Provides a driver for the AMD Athlon64/Opteron/Turion/Sempron GART
519 based hardware IOMMU and a software bounce buffer based IOMMU used
520 on Intel systems and as fallback.
521 The code is only active when needed (enough memory and limited
522 device) unless CONFIG_IOMMU_DEBUG or iommu=force is specified
523 too.
524
525config CALGARY_IOMMU
526 bool "IBM Calgary IOMMU support"
527 select SWIOTLB
528 depends on X86_64 && PCI && EXPERIMENTAL
529 help
530 Support for hardware IOMMUs in IBM's xSeries x366 and x460
531 systems. Needed to run systems with more than 3GB of memory
532 properly with 32-bit PCI devices that do not support DAC
533 (Double Address Cycle). Calgary also supports bus level
534 isolation, where all DMAs pass through the IOMMU. This
535 prevents them from going anywhere except their intended
536 destination. This catches hard-to-find kernel bugs and
537 mis-behaving drivers and devices that do not use the DMA-API
538 properly to set up their DMA buffers. The IOMMU can be
539 turned off at boot time with the iommu=off parameter.
540 Normally the kernel will make the right choice by itself.
541 If unsure, say Y.
542
543config CALGARY_IOMMU_ENABLED_BY_DEFAULT
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100544 def_bool y
545 prompt "Should Calgary be enabled by default?"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100546 depends on CALGARY_IOMMU
547 help
548 Should Calgary be enabled by default? if you choose 'y', Calgary
549 will be used (if it exists). If you choose 'n', Calgary will not be
550 used even if it exists. If you choose 'n' and would like to use
551 Calgary anyway, pass 'iommu=calgary' on the kernel command line.
552 If unsure, say Y.
553
Joerg Roedel2b188722008-06-26 21:27:37 +0200554config AMD_IOMMU
555 bool "AMD IOMMU support"
Ingo Molnar07c40e82008-06-27 11:31:28 +0200556 select SWIOTLB
Ingo Molnar24d2ba02008-06-27 10:37:03 +0200557 depends on X86_64 && PCI && ACPI
Joerg Roedel2b188722008-06-26 21:27:37 +0200558 help
Joerg Roedel18d22202008-07-03 19:35:06 +0200559 With this option you can enable support for AMD IOMMU hardware in
560 your system. An IOMMU is a hardware component which provides
561 remapping of DMA memory accesses from devices. With an AMD IOMMU you
562 can isolate the the DMA memory of different devices and protect the
563 system from misbehaving device drivers or hardware.
564
565 You can find out if your system has an AMD IOMMU if you look into
566 your BIOS for an option to enable it or if you have an IVRS ACPI
567 table.
Joerg Roedel2b188722008-06-26 21:27:37 +0200568
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100569# need this always selected by IOMMU for the VIA workaround
570config SWIOTLB
571 bool
572 help
573 Support for software bounce buffers used on x86-64 systems
574 which don't have a hardware IOMMU (e.g. the current generation
575 of Intel's x86-64 CPUs). Using this PCI devices which can only
576 access 32-bits of memory can be used on systems with more than
577 3 GB of memory. If unsure, say Y.
578
FUJITA Tomonoria8522502008-04-29 00:59:36 -0700579config IOMMU_HELPER
FUJITA Tomonori18b743d2008-07-10 09:50:50 +0900580 def_bool (CALGARY_IOMMU || GART_IOMMU || SWIOTLB || AMD_IOMMU)
Mike Travis1184dc22008-05-12 21:21:12 +0200581config MAXSMP
582 bool "Configure Maximum number of SMP Processors and NUMA Nodes"
583 depends on X86_64 && SMP
584 default n
585 help
586 Configure maximum number of CPUS and NUMA Nodes for this architecture.
587 If unsure, say N.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100588
Mike Travis1184dc22008-05-12 21:21:12 +0200589if MAXSMP
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100590config NR_CPUS
Mike Travis1184dc22008-05-12 21:21:12 +0200591 int
592 default "4096"
593endif
594
595if !MAXSMP
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100596config NR_CPUS
Mike Travisc3ed6422008-05-16 10:44:39 -0700597 int "Maximum number of CPUs (2-4096)"
598 range 2 4096
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100599 depends on SMP
600 default "32" if X86_NUMAQ || X86_SUMMIT || X86_BIGSMP || X86_ES7000
601 default "8"
602 help
603 This allows you to specify the maximum number of CPUs which this
Mike Travisc3ed6422008-05-16 10:44:39 -0700604 kernel will support. The maximum supported value is 4096 and the
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100605 minimum value which makes sense is 2.
606
607 This is purely to save memory - each supported CPU adds
608 approximately eight kilobytes to the kernel image.
Mike Travis1184dc22008-05-12 21:21:12 +0200609endif
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100610
611config SCHED_SMT
612 bool "SMT (Hyperthreading) scheduler support"
Hiroshi Shimamotob089c122008-02-27 13:16:30 -0800613 depends on X86_HT
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100614 help
615 SMT scheduler support improves the CPU scheduler's decision making
616 when dealing with Intel Pentium 4 chips with HyperThreading at a
617 cost of slightly increased overhead in some places. If unsure say
618 N here.
619
620config SCHED_MC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100621 def_bool y
622 prompt "Multi-core scheduler support"
Hiroshi Shimamotob089c122008-02-27 13:16:30 -0800623 depends on X86_HT
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100624 help
625 Multi-core scheduler support improves the CPU scheduler's decision
626 making when dealing with multi-core CPU chips at a cost of slightly
627 increased overhead in some places. If unsure say N here.
628
629source "kernel/Kconfig.preempt"
630
631config X86_UP_APIC
632 bool "Local APIC support on uniprocessors"
Ingo Molnarefefa6f2008-07-10 16:09:50 +0200633 depends on X86_32 && !SMP && !(X86_VOYAGER || X86_GENERICARCH)
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100634 help
635 A local APIC (Advanced Programmable Interrupt Controller) is an
636 integrated interrupt controller in the CPU. If you have a single-CPU
637 system which has a processor with a local APIC, you can say Y here to
638 enable and use it. If you say Y here even though your machine doesn't
639 have a local APIC, then the kernel will still run with no slowdown at
640 all. The local APIC supports CPU-generated self-interrupts (timer,
641 performance counters), and the NMI watchdog which detects hard
642 lockups.
643
644config X86_UP_IOAPIC
645 bool "IO-APIC support on uniprocessors"
646 depends on X86_UP_APIC
647 help
648 An IO-APIC (I/O Advanced Programmable Interrupt Controller) is an
649 SMP-capable replacement for PC-style interrupt controllers. Most
650 SMP systems and many recent uniprocessor systems have one.
651
652 If you have a single-CPU system with an IO-APIC, you can say Y here
653 to use it. If you say Y here even though your machine doesn't have
654 an IO-APIC, then the kernel will still run with no slowdown at all.
655
656config X86_LOCAL_APIC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100657 def_bool y
Ingo Molnarefefa6f2008-07-10 16:09:50 +0200658 depends on X86_64 || (X86_32 && (X86_UP_APIC || (SMP && !X86_VOYAGER) || X86_GENERICARCH))
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100659
660config X86_IO_APIC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100661 def_bool y
Ingo Molnarefefa6f2008-07-10 16:09:50 +0200662 depends on X86_64 || (X86_32 && (X86_UP_IOAPIC || (SMP && !X86_VOYAGER) || X86_GENERICARCH))
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100663
664config X86_VISWS_APIC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100665 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100666 depends on X86_32 && X86_VISWS
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100667
668config X86_MCE
669 bool "Machine Check Exception"
670 depends on !X86_VOYAGER
671 ---help---
672 Machine Check Exception support allows the processor to notify the
673 kernel if it detects a problem (e.g. overheating, component failure).
674 The action the kernel takes depends on the severity of the problem,
675 ranging from a warning message on the console, to halting the machine.
676 Your processor must be a Pentium or newer to support this - check the
677 flags in /proc/cpuinfo for mce. Note that some older Pentium systems
678 have a design flaw which leads to false MCE events - hence MCE is
679 disabled on all P5 processors, unless explicitly enabled with "mce"
680 as a boot argument. Similarly, if MCE is built in and creates a
681 problem on some new non-standard machine, you can boot with "nomce"
682 to disable it. MCE support simply ignores non-MCE processors like
683 the 386 and 486, so nearly everyone can say Y here.
684
685config X86_MCE_INTEL
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100686 def_bool y
687 prompt "Intel MCE features"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100688 depends on X86_64 && X86_MCE && X86_LOCAL_APIC
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100689 help
690 Additional support for intel specific MCE features such as
691 the thermal monitor.
692
693config X86_MCE_AMD
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100694 def_bool y
695 prompt "AMD MCE features"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100696 depends on X86_64 && X86_MCE && X86_LOCAL_APIC
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100697 help
698 Additional support for AMD specific MCE features such as
699 the DRAM Error Threshold.
700
701config X86_MCE_NONFATAL
702 tristate "Check for non-fatal errors on AMD Athlon/Duron / Intel Pentium 4"
703 depends on X86_32 && X86_MCE
704 help
705 Enabling this feature starts a timer that triggers every 5 seconds which
706 will look at the machine check registers to see if anything happened.
707 Non-fatal problems automatically get corrected (but still logged).
708 Disable this if you don't want to see these messages.
709 Seeing the messages this option prints out may be indicative of dying
710 or out-of-spec (ie, overclocked) hardware.
711 This option only does something on certain CPUs.
712 (AMD Athlon/Duron and Intel Pentium 4)
713
714config X86_MCE_P4THERMAL
715 bool "check for P4 thermal throttling interrupt."
Ingo Molnarefefa6f2008-07-10 16:09:50 +0200716 depends on X86_32 && X86_MCE && (X86_UP_APIC || SMP)
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100717 help
718 Enabling this feature will cause a message to be printed when the P4
719 enters thermal throttling.
720
721config VM86
722 bool "Enable VM86 support" if EMBEDDED
723 default y
724 depends on X86_32
725 help
726 This option is required by programs like DOSEMU to run 16-bit legacy
727 code on X86 processors. It also may be needed by software like
728 XFree86 to initialize some video cards via BIOS. Disabling this
729 option saves about 6k.
730
731config TOSHIBA
732 tristate "Toshiba Laptop support"
733 depends on X86_32
734 ---help---
735 This adds a driver to safely access the System Management Mode of
736 the CPU on Toshiba portables with a genuine Toshiba BIOS. It does
737 not work on models with a Phoenix BIOS. The System Management Mode
738 is used to set the BIOS and power saving options on Toshiba portables.
739
740 For information on utilities to make use of this driver see the
741 Toshiba Linux utilities web site at:
742 <http://www.buzzard.org.uk/toshiba/>.
743
744 Say Y if you intend to run this kernel on a Toshiba portable.
745 Say N otherwise.
746
747config I8K
748 tristate "Dell laptop support"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100749 ---help---
750 This adds a driver to safely access the System Management Mode
751 of the CPU on the Dell Inspiron 8000. The System Management Mode
752 is used to read cpu temperature and cooling fan status and to
753 control the fans on the I8K portables.
754
755 This driver has been tested only on the Inspiron 8000 but it may
756 also work with other Dell laptops. You can force loading on other
757 models by passing the parameter `force=1' to the module. Use at
758 your own risk.
759
760 For information on utilities to make use of this driver see the
761 I8K Linux utilities web site at:
762 <http://people.debian.org/~dz/i8k/>
763
764 Say Y if you intend to run this kernel on a Dell Inspiron 8000.
765 Say N otherwise.
766
767config X86_REBOOTFIXUPS
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100768 def_bool n
769 prompt "Enable X86 board specific fixups for reboot"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100770 depends on X86_32 && X86
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100771 ---help---
772 This enables chipset and/or board specific fixups to be done
773 in order to get reboot to work correctly. This is only needed on
774 some combinations of hardware and BIOS. The symptom, for which
775 this config is intended, is when reboot ends with a stalled/hung
776 system.
777
778 Currently, the only fixup is for the Geode machines using
Florian Fainelli5e3a77e2008-01-30 13:33:36 +0100779 CS5530A and CS5536 chipsets and the RDC R-321x SoC.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100780
781 Say Y if you want to enable the fixup. Currently, it's safe to
782 enable this option even if you don't need it.
783 Say N otherwise.
784
785config MICROCODE
786 tristate "/dev/cpu/microcode - Intel IA32 CPU microcode support"
787 select FW_LOADER
788 ---help---
789 If you say Y here, you will be able to update the microcode on
790 Intel processors in the IA32 family, e.g. Pentium Pro, Pentium II,
791 Pentium III, Pentium 4, Xeon etc. You will obviously need the
792 actual microcode binary data itself which is not shipped with the
793 Linux kernel.
794
795 For latest news and information on obtaining all the required
796 ingredients for this driver, check:
797 <http://www.urbanmyth.org/microcode/>.
798
799 To compile this driver as a module, choose M here: the
800 module will be called microcode.
801
802config MICROCODE_OLD_INTERFACE
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100803 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100804 depends on MICROCODE
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100805
806config X86_MSR
807 tristate "/dev/cpu/*/msr - Model-specific register support"
808 help
809 This device gives privileged processes access to the x86
810 Model-Specific Registers (MSRs). It is a character device with
811 major 202 and minors 0 to 31 for /dev/cpu/0/msr to /dev/cpu/31/msr.
812 MSR accesses are directed to a specific CPU on multi-processor
813 systems.
814
815config X86_CPUID
816 tristate "/dev/cpu/*/cpuid - CPU information support"
817 help
818 This device gives processes access to the x86 CPUID instruction to
819 be executed on a specific processor. It is a character device
820 with major 203 and minors 0 to 31 for /dev/cpu/0/cpuid to
821 /dev/cpu/31/cpuid.
822
823choice
824 prompt "High Memory Support"
825 default HIGHMEM4G if !X86_NUMAQ
826 default HIGHMEM64G if X86_NUMAQ
827 depends on X86_32
828
829config NOHIGHMEM
830 bool "off"
831 depends on !X86_NUMAQ
832 ---help---
833 Linux can use up to 64 Gigabytes of physical memory on x86 systems.
834 However, the address space of 32-bit x86 processors is only 4
835 Gigabytes large. That means that, if you have a large amount of
836 physical memory, not all of it can be "permanently mapped" by the
837 kernel. The physical memory that's not permanently mapped is called
838 "high memory".
839
840 If you are compiling a kernel which will never run on a machine with
841 more than 1 Gigabyte total physical RAM, answer "off" here (default
842 choice and suitable for most users). This will result in a "3GB/1GB"
843 split: 3GB are mapped so that each process sees a 3GB virtual memory
844 space and the remaining part of the 4GB virtual memory space is used
845 by the kernel to permanently map as much physical memory as
846 possible.
847
848 If the machine has between 1 and 4 Gigabytes physical RAM, then
849 answer "4GB" here.
850
851 If more than 4 Gigabytes is used then answer "64GB" here. This
852 selection turns Intel PAE (Physical Address Extension) mode on.
853 PAE implements 3-level paging on IA32 processors. PAE is fully
854 supported by Linux, PAE mode is implemented on all recent Intel
855 processors (Pentium Pro and better). NOTE: If you say "64GB" here,
856 then the kernel will not boot on CPUs that don't support PAE!
857
858 The actual amount of total physical memory will either be
859 auto detected or can be forced by using a kernel command line option
860 such as "mem=256M". (Try "man bootparam" or see the documentation of
861 your boot loader (lilo or loadlin) about how to pass options to the
862 kernel at boot time.)
863
864 If unsure, say "off".
865
866config HIGHMEM4G
867 bool "4GB"
868 depends on !X86_NUMAQ
869 help
870 Select this if you have a 32-bit processor and between 1 and 4
871 gigabytes of physical RAM.
872
873config HIGHMEM64G
874 bool "64GB"
875 depends on !M386 && !M486
876 select X86_PAE
877 help
878 Select this if you have a 32-bit processor and more than 4
879 gigabytes of physical RAM.
880
881endchoice
882
883choice
884 depends on EXPERIMENTAL
885 prompt "Memory split" if EMBEDDED
886 default VMSPLIT_3G
887 depends on X86_32
888 help
889 Select the desired split between kernel and user memory.
890
891 If the address range available to the kernel is less than the
892 physical memory installed, the remaining memory will be available
893 as "high memory". Accessing high memory is a little more costly
894 than low memory, as it needs to be mapped into the kernel first.
895 Note that increasing the kernel address space limits the range
896 available to user programs, making the address space there
897 tighter. Selecting anything other than the default 3G/1G split
898 will also likely make your kernel incompatible with binary-only
899 kernel modules.
900
901 If you are not absolutely sure what you are doing, leave this
902 option alone!
903
904 config VMSPLIT_3G
905 bool "3G/1G user/kernel split"
906 config VMSPLIT_3G_OPT
907 depends on !X86_PAE
908 bool "3G/1G user/kernel split (for full 1G low memory)"
909 config VMSPLIT_2G
910 bool "2G/2G user/kernel split"
911 config VMSPLIT_2G_OPT
912 depends on !X86_PAE
913 bool "2G/2G user/kernel split (for full 2G low memory)"
914 config VMSPLIT_1G
915 bool "1G/3G user/kernel split"
916endchoice
917
918config PAGE_OFFSET
919 hex
920 default 0xB0000000 if VMSPLIT_3G_OPT
921 default 0x80000000 if VMSPLIT_2G
922 default 0x78000000 if VMSPLIT_2G_OPT
923 default 0x40000000 if VMSPLIT_1G
924 default 0xC0000000
925 depends on X86_32
926
927config HIGHMEM
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100928 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100929 depends on X86_32 && (HIGHMEM64G || HIGHMEM4G)
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100930
931config X86_PAE
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100932 def_bool n
933 prompt "PAE (Physical Address Extension) Support"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100934 depends on X86_32 && !HIGHMEM4G
935 select RESOURCES_64BIT
936 help
937 PAE is required for NX support, and furthermore enables
938 larger swapspace support for non-overcommit purposes. It
939 has the cost of more pagetable lookup overhead, and also
940 consumes more pagetable space per process.
941
942# Common NUMA Features
943config NUMA
944 bool "Numa Memory Allocation and Scheduler Support (EXPERIMENTAL)"
945 depends on SMP
Yinghai Lu0699eae2008-06-17 15:39:01 -0700946 depends on X86_64 || (X86_32 && HIGHMEM64G && (X86_NUMAQ || X86_BIGSMP || X86_SUMMIT && ACPI) && EXPERIMENTAL)
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100947 default n if X86_PC
Yinghai Lu0699eae2008-06-17 15:39:01 -0700948 default y if (X86_NUMAQ || X86_SUMMIT || X86_BIGSMP)
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100949 help
950 Enable NUMA (Non Uniform Memory Access) support.
951 The kernel will try to allocate memory used by a CPU on the
952 local memory controller of the CPU and add some more
953 NUMA awareness to the kernel.
954
955 For i386 this is currently highly experimental and should be only
956 used for kernel development. It might also cause boot failures.
957 For x86_64 this is recommended on all multiprocessor Opteron systems.
958 If the system is EM64T, you should say N unless your system is
959 EM64T NUMA.
960
961comment "NUMA (Summit) requires SMP, 64GB highmem support, ACPI"
962 depends on X86_32 && X86_SUMMIT && (!HIGHMEM64G || !ACPI)
963
964config K8_NUMA
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100965 def_bool y
966 prompt "Old style AMD Opteron NUMA detection"
967 depends on X86_64 && NUMA && PCI
968 help
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100969 Enable K8 NUMA node topology detection. You should say Y here if
970 you have a multi processor AMD K8 system. This uses an old
971 method to read the NUMA configuration directly from the builtin
972 Northbridge of Opteron. It is recommended to use X86_64_ACPI_NUMA
973 instead, which also takes priority if both are compiled in.
974
975config X86_64_ACPI_NUMA
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100976 def_bool y
977 prompt "ACPI NUMA detection"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100978 depends on X86_64 && NUMA && ACPI && PCI
979 select ACPI_NUMA
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100980 help
981 Enable ACPI SRAT based node topology detection.
982
Suresh Siddha6ec6e0d2008-03-25 10:14:35 -0700983# Some NUMA nodes have memory ranges that span
984# other nodes. Even though a pfn is valid and
985# between a node's start and end pfns, it may not
986# reside on that node. See memmap_init_zone()
987# for details.
988config NODES_SPAN_OTHER_NODES
989 def_bool y
990 depends on X86_64_ACPI_NUMA
991
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100992config NUMA_EMU
993 bool "NUMA emulation"
994 depends on X86_64 && NUMA
995 help
996 Enable NUMA emulation. A flat machine will be split
997 into virtual nodes when booted with "numa=fake=N", where N is the
998 number of nodes. This is only useful for debugging.
999
Mike Travis1184dc22008-05-12 21:21:12 +02001000if MAXSMP
1001
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001002config NODES_SHIFT
Mike Travis1184dc22008-05-12 21:21:12 +02001003 int
1004 default "9"
1005endif
1006
1007if !MAXSMP
1008config NODES_SHIFT
1009 int "Maximum NUMA Nodes (as a power of 2)"
1010 range 1 9 if X86_64
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001011 default "6" if X86_64
1012 default "4" if X86_NUMAQ
1013 default "3"
1014 depends on NEED_MULTIPLE_NODES
Mike Travis1184dc22008-05-12 21:21:12 +02001015 help
1016 Specify the maximum number of NUMA Nodes available on the target
1017 system. Increases memory reserved to accomodate various tables.
1018endif
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001019
1020config HAVE_ARCH_BOOTMEM_NODE
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001021 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001022 depends on X86_32 && NUMA
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001023
1024config ARCH_HAVE_MEMORY_PRESENT
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001025 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001026 depends on X86_32 && DISCONTIGMEM
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001027
1028config NEED_NODE_MEMMAP_SIZE
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001029 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001030 depends on X86_32 && (DISCONTIGMEM || SPARSEMEM)
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001031
1032config HAVE_ARCH_ALLOC_REMAP
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001033 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001034 depends on X86_32 && NUMA
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001035
1036config ARCH_FLATMEM_ENABLE
1037 def_bool y
Jeff Chua99809962008-08-06 19:09:53 +08001038 depends on X86_32 && ARCH_SELECT_MEMORY_MODEL && !NUMA
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001039
1040config ARCH_DISCONTIGMEM_ENABLE
1041 def_bool y
Christoph Lameterb2632952008-01-30 13:30:47 +01001042 depends on NUMA && X86_32
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001043
1044config ARCH_DISCONTIGMEM_DEFAULT
1045 def_bool y
Christoph Lameterb2632952008-01-30 13:30:47 +01001046 depends on NUMA && X86_32
1047
1048config ARCH_SPARSEMEM_DEFAULT
1049 def_bool y
1050 depends on X86_64
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001051
1052config ARCH_SPARSEMEM_ENABLE
1053 def_bool y
Jeff Chua99809962008-08-06 19:09:53 +08001054 depends on X86_64 || NUMA || (EXPERIMENTAL && X86_PC) || X86_GENERICARCH
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001055 select SPARSEMEM_STATIC if X86_32
1056 select SPARSEMEM_VMEMMAP_ENABLE if X86_64
1057
1058config ARCH_SELECT_MEMORY_MODEL
1059 def_bool y
Christoph Lameterb2632952008-01-30 13:30:47 +01001060 depends on ARCH_SPARSEMEM_ENABLE
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001061
1062config ARCH_MEMORY_PROBE
1063 def_bool X86_64
1064 depends on MEMORY_HOTPLUG
1065
1066source "mm/Kconfig"
1067
1068config HIGHPTE
1069 bool "Allocate 3rd-level pagetables from highmem"
1070 depends on X86_32 && (HIGHMEM4G || HIGHMEM64G)
1071 help
1072 The VM uses one page table entry for each page of physical memory.
1073 For systems with a lot of RAM, this can be wasteful of precious
1074 low memory. Setting this option will put user-space page table
1075 entries in high memory.
1076
1077config MATH_EMULATION
1078 bool
1079 prompt "Math emulation" if X86_32
1080 ---help---
1081 Linux can emulate a math coprocessor (used for floating point
1082 operations) if you don't have one. 486DX and Pentium processors have
1083 a math coprocessor built in, 486SX and 386 do not, unless you added
1084 a 487DX or 387, respectively. (The messages during boot time can
1085 give you some hints here ["man dmesg"].) Everyone needs either a
1086 coprocessor or this emulation.
1087
1088 If you don't have a math coprocessor, you need to say Y here; if you
1089 say Y here even though you have a coprocessor, the coprocessor will
1090 be used nevertheless. (This behavior can be changed with the kernel
1091 command line option "no387", which comes handy if your coprocessor
1092 is broken. Try "man bootparam" or see the documentation of your boot
1093 loader (lilo or loadlin) about how to pass options to the kernel at
1094 boot time.) This means that it is a good idea to say Y here if you
1095 intend to use this kernel on different machines.
1096
1097 More information about the internals of the Linux math coprocessor
1098 emulation can be found in <file:arch/x86/math-emu/README>.
1099
1100 If you are not sure, say Y; apart from resulting in a 66 KB bigger
1101 kernel, it won't hurt.
1102
1103config MTRR
1104 bool "MTRR (Memory Type Range Register) support"
1105 ---help---
1106 On Intel P6 family processors (Pentium Pro, Pentium II and later)
1107 the Memory Type Range Registers (MTRRs) may be used to control
1108 processor access to memory ranges. This is most useful if you have
1109 a video (VGA) card on a PCI or AGP bus. Enabling write-combining
1110 allows bus write transfers to be combined into a larger transfer
1111 before bursting over the PCI/AGP bus. This can increase performance
1112 of image write operations 2.5 times or more. Saying Y here creates a
1113 /proc/mtrr file which may be used to manipulate your processor's
1114 MTRRs. Typically the X server should use this.
1115
1116 This code has a reasonably generic interface so that similar
1117 control registers on other processors can be easily supported
1118 as well:
1119
1120 The Cyrix 6x86, 6x86MX and M II processors have Address Range
1121 Registers (ARRs) which provide a similar functionality to MTRRs. For
1122 these, the ARRs are used to emulate the MTRRs.
1123 The AMD K6-2 (stepping 8 and above) and K6-3 processors have two
1124 MTRRs. The Centaur C6 (WinChip) has 8 MCRs, allowing
1125 write-combining. All of these processors are supported by this code
1126 and it makes sense to say Y here if you have one of them.
1127
1128 Saying Y here also fixes a problem with buggy SMP BIOSes which only
1129 set the MTRRs for the boot CPU and not for the secondary CPUs. This
1130 can lead to all sorts of problems, so it's good to say Y here.
1131
1132 You can safely say Y even if your machine doesn't have MTRRs, you'll
1133 just add about 9 KB to your kernel.
1134
1135 See <file:Documentation/mtrr.txt> for more information.
1136
Yinghai Lu95ffa242008-04-29 03:52:33 -07001137config MTRR_SANITIZER
Thomas Gleixneraba37282008-07-15 14:48:48 +02001138 bool
Yinghai Lu95ffa242008-04-29 03:52:33 -07001139 prompt "MTRR cleanup support"
1140 depends on MTRR
1141 help
Thomas Gleixneraba37282008-07-15 14:48:48 +02001142 Convert MTRR layout from continuous to discrete, so X drivers can
1143 add writeback entries.
Yinghai Lu95ffa242008-04-29 03:52:33 -07001144
Thomas Gleixneraba37282008-07-15 14:48:48 +02001145 Can be disabled with disable_mtrr_cleanup on the kernel command line.
1146 The largest mtrr entry size for a continous block can be set with
1147 mtrr_chunk_size.
Yinghai Lu95ffa242008-04-29 03:52:33 -07001148
Thomas Gleixneraba37282008-07-15 14:48:48 +02001149 If unsure, say N.
Yinghai Lu95ffa242008-04-29 03:52:33 -07001150
1151config MTRR_SANITIZER_ENABLE_DEFAULT
Yinghai Luf5098d62008-04-29 20:25:58 -07001152 int "MTRR cleanup enable value (0-1)"
1153 range 0 1
1154 default "0"
Yinghai Lu95ffa242008-04-29 03:52:33 -07001155 depends on MTRR_SANITIZER
1156 help
Yinghai Luf5098d62008-04-29 20:25:58 -07001157 Enable mtrr cleanup default value
Yinghai Lu95ffa242008-04-29 03:52:33 -07001158
Yinghai Lu12031a62008-05-02 02:40:22 -07001159config MTRR_SANITIZER_SPARE_REG_NR_DEFAULT
1160 int "MTRR cleanup spare reg num (0-7)"
1161 range 0 7
1162 default "1"
1163 depends on MTRR_SANITIZER
1164 help
1165 mtrr cleanup spare entries default, it can be changed via
Thomas Gleixneraba37282008-07-15 14:48:48 +02001166 mtrr_spare_reg_nr=N on the kernel command line.
Yinghai Lu12031a62008-05-02 02:40:22 -07001167
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001168config X86_PAT
Ingo Molnar2a8a2712008-04-26 10:26:52 +02001169 bool
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001170 prompt "x86 PAT support"
Ingo Molnar2a8a2712008-04-26 10:26:52 +02001171 depends on MTRR
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001172 help
1173 Use PAT attributes to setup page level cache control.
Venki Pallipadi042b78e2008-03-24 14:22:35 -07001174
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001175 PATs are the modern equivalents of MTRRs and are much more
1176 flexible than MTRRs.
1177
1178 Say N here if you see bootup problems (boot crash, boot hang,
Venki Pallipadi042b78e2008-03-24 14:22:35 -07001179 spontaneous reboots) or a non-working video driver.
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001180
1181 If unsure, say Y.
1182
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001183config EFI
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001184 def_bool n
Huang, Ying8b2cb7a2008-01-30 13:32:11 +01001185 prompt "EFI runtime service support"
Huang, Ying5b836832008-01-30 13:31:19 +01001186 depends on ACPI
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001187 ---help---
Huang, Ying8b2cb7a2008-01-30 13:32:11 +01001188 This enables the kernel to use EFI runtime services that are
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001189 available (such as the EFI variable services).
1190
Huang, Ying8b2cb7a2008-01-30 13:32:11 +01001191 This option is only useful on systems that have EFI firmware.
1192 In addition, you should use the latest ELILO loader available
1193 at <http://elilo.sourceforge.net> in order to take advantage
1194 of EFI runtime services. However, even with this option, the
1195 resultant kernel should continue to boot on existing non-EFI
1196 platforms.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001197
1198config IRQBALANCE
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001199 def_bool y
1200 prompt "Enable kernel irq balancing"
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001201 depends on X86_32 && SMP && X86_IO_APIC
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001202 help
1203 The default yes will allow the kernel to do irq load balancing.
1204 Saying no will keep the kernel from doing irq load balancing.
1205
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001206config SECCOMP
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001207 def_bool y
1208 prompt "Enable seccomp to safely compute untrusted bytecode"
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001209 depends on PROC_FS
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001210 help
1211 This kernel feature is useful for number crunching applications
1212 that may need to compute untrusted bytecode during their
1213 execution. By using pipes or other transports made available to
1214 the process as file descriptors supporting the read/write
1215 syscalls, it's possible to isolate those applications in
1216 their own address space using seccomp. Once seccomp is
1217 enabled via /proc/<pid>/seccomp, it cannot be disabled
1218 and the task is only allowed to execute a few safe syscalls
1219 defined by each seccomp mode.
1220
1221 If unsure, say Y. Only embedded should say N here.
1222
1223config CC_STACKPROTECTOR
1224 bool "Enable -fstack-protector buffer overflow detection (EXPERIMENTAL)"
Linus Torvalds2c020a92008-02-22 08:21:38 -08001225 depends on X86_64 && EXPERIMENTAL && BROKEN
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001226 help
1227 This option turns on the -fstack-protector GCC feature. This
1228 feature puts, at the beginning of critical functions, a canary
1229 value on the stack just before the return address, and validates
1230 the value just before actually returning. Stack based buffer
1231 overflows (that need to overwrite this return address) now also
1232 overwrite the canary, which gets detected and the attack is then
1233 neutralized via a kernel panic.
1234
1235 This feature requires gcc version 4.2 or above, or a distribution
1236 gcc with the feature backported. Older versions are automatically
1237 detected and for those versions, this configuration option is ignored.
1238
1239config CC_STACKPROTECTOR_ALL
1240 bool "Use stack-protector for all functions"
1241 depends on CC_STACKPROTECTOR
1242 help
1243 Normally, GCC only inserts the canary value protection for
1244 functions that use large-ish on-stack buffers. By enabling
1245 this option, GCC will be asked to do this for ALL functions.
1246
1247source kernel/Kconfig.hz
1248
1249config KEXEC
1250 bool "kexec system call"
Ingo Molnar3e8f7e32008-04-28 10:46:58 +02001251 depends on X86_BIOS_REBOOT
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001252 help
1253 kexec is a system call that implements the ability to shutdown your
1254 current kernel, and to start another kernel. It is like a reboot
1255 but it is independent of the system firmware. And like a reboot
1256 you can start any kernel with it, not just Linux.
1257
1258 The name comes from the similarity to the exec system call.
1259
1260 It is an ongoing process to be certain the hardware in a machine
1261 is properly shutdown, so do not be surprised if this code does not
1262 initially work for you. It may help to enable device hotplugging
1263 support. As of this writing the exact hardware interface is
1264 strongly in flux, so no good recommendation can be made.
1265
1266config CRASH_DUMP
1267 bool "kernel crash dumps (EXPERIMENTAL)"
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001268 depends on X86_64 || (X86_32 && HIGHMEM)
1269 help
1270 Generate crash dump after being started by kexec.
1271 This should be normally only set in special crash dump kernels
1272 which are loaded in the main kernel with kexec-tools into
1273 a specially reserved region and then later executed after
1274 a crash by kdump/kexec. The crash dump kernel must be compiled
1275 to a memory address not used by the main kernel or BIOS using
1276 PHYSICAL_START, or it must be built as a relocatable image
1277 (CONFIG_RELOCATABLE=y).
1278 For more details see Documentation/kdump/kdump.txt
1279
Huang Ying3ab83522008-07-25 19:45:07 -07001280config KEXEC_JUMP
1281 bool "kexec jump (EXPERIMENTAL)"
1282 depends on EXPERIMENTAL
Huang Ying89081d12008-07-25 19:45:10 -07001283 depends on KEXEC && HIBERNATION && X86_32
Huang Ying3ab83522008-07-25 19:45:07 -07001284 help
Huang Ying89081d12008-07-25 19:45:10 -07001285 Jump between original kernel and kexeced kernel and invoke
1286 code in physical address mode via KEXEC
Huang Ying3ab83522008-07-25 19:45:07 -07001287
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001288config PHYSICAL_START
1289 hex "Physical address where the kernel is loaded" if (EMBEDDED || CRASH_DUMP)
1290 default "0x1000000" if X86_NUMAQ
1291 default "0x200000" if X86_64
1292 default "0x100000"
1293 help
1294 This gives the physical address where the kernel is loaded.
1295
1296 If kernel is a not relocatable (CONFIG_RELOCATABLE=n) then
1297 bzImage will decompress itself to above physical address and
1298 run from there. Otherwise, bzImage will run from the address where
1299 it has been loaded by the boot loader and will ignore above physical
1300 address.
1301
1302 In normal kdump cases one does not have to set/change this option
1303 as now bzImage can be compiled as a completely relocatable image
1304 (CONFIG_RELOCATABLE=y) and be used to load and run from a different
1305 address. This option is mainly useful for the folks who don't want
1306 to use a bzImage for capturing the crash dump and want to use a
1307 vmlinux instead. vmlinux is not relocatable hence a kernel needs
1308 to be specifically compiled to run from a specific memory area
1309 (normally a reserved region) and this option comes handy.
1310
1311 So if you are using bzImage for capturing the crash dump, leave
1312 the value here unchanged to 0x100000 and set CONFIG_RELOCATABLE=y.
1313 Otherwise if you plan to use vmlinux for capturing the crash dump
1314 change this value to start of the reserved region (Typically 16MB
1315 0x1000000). In other words, it can be set based on the "X" value as
1316 specified in the "crashkernel=YM@XM" command line boot parameter
1317 passed to the panic-ed kernel. Typically this parameter is set as
1318 crashkernel=64M@16M. Please take a look at
1319 Documentation/kdump/kdump.txt for more details about crash dumps.
1320
1321 Usage of bzImage for capturing the crash dump is recommended as
1322 one does not have to build two kernels. Same kernel can be used
1323 as production kernel and capture kernel. Above option should have
1324 gone away after relocatable bzImage support is introduced. But it
1325 is present because there are users out there who continue to use
1326 vmlinux for dump capture. This option should go away down the
1327 line.
1328
1329 Don't change this unless you know what you are doing.
1330
1331config RELOCATABLE
1332 bool "Build a relocatable kernel (EXPERIMENTAL)"
1333 depends on EXPERIMENTAL
1334 help
1335 This builds a kernel image that retains relocation information
1336 so it can be loaded someplace besides the default 1MB.
1337 The relocations tend to make the kernel binary about 10% larger,
1338 but are discarded at runtime.
1339
1340 One use is for the kexec on panic case where the recovery kernel
1341 must live at a different physical address than the primary
1342 kernel.
1343
1344 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
1345 it has been loaded at and the compile time physical address
1346 (CONFIG_PHYSICAL_START) is ignored.
1347
1348config PHYSICAL_ALIGN
1349 hex
1350 prompt "Alignment value to which kernel should be aligned" if X86_32
1351 default "0x100000" if X86_32
1352 default "0x200000" if X86_64
1353 range 0x2000 0x400000
1354 help
1355 This value puts the alignment restrictions on physical address
1356 where kernel is loaded and run from. Kernel is compiled for an
1357 address which meets above alignment restriction.
1358
1359 If bootloader loads the kernel at a non-aligned address and
1360 CONFIG_RELOCATABLE is set, kernel will move itself to nearest
1361 address aligned to above value and run from there.
1362
1363 If bootloader loads the kernel at a non-aligned address and
1364 CONFIG_RELOCATABLE is not set, kernel will ignore the run time
1365 load address and decompress itself to the address it has been
1366 compiled for and run from there. The address for which kernel is
1367 compiled already meets above alignment restrictions. Hence the
1368 end result is that kernel runs from a physical address meeting
1369 above alignment restrictions.
1370
1371 Don't change this unless you know what you are doing.
1372
1373config HOTPLUG_CPU
Dimitri Sivanich7c13e6a2008-08-11 10:46:46 -05001374 bool "Support for hot-pluggable CPUs"
1375 depends on SMP && HOTPLUG && !X86_VOYAGER
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001376 ---help---
Dimitri Sivanich7c13e6a2008-08-11 10:46:46 -05001377 Say Y here to allow turning CPUs off and on. CPUs can be
1378 controlled through /sys/devices/system/cpu.
1379 ( Note: power management support will enable this option
1380 automatically on SMP systems. )
1381 Say N if you want to disable CPU hotplug.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001382
1383config COMPAT_VDSO
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001384 def_bool y
1385 prompt "Compat VDSO support"
Roland McGrathaf65d642008-01-30 13:30:43 +01001386 depends on X86_32 || IA32_EMULATION
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001387 help
Roland McGrathaf65d642008-01-30 13:30:43 +01001388 Map the 32-bit VDSO to the predictable old-style address too.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001389 ---help---
1390 Say N here if you are running a sufficiently recent glibc
1391 version (2.3.3 or later), to remove the high-mapped
1392 VDSO mapping and to exclusively use the randomized VDSO.
1393
1394 If unsure, say Y.
1395
1396endmenu
1397
1398config ARCH_ENABLE_MEMORY_HOTPLUG
1399 def_bool y
1400 depends on X86_64 || (X86_32 && HIGHMEM)
1401
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001402config HAVE_ARCH_EARLY_PFN_TO_NID
1403 def_bool X86_64
1404 depends on NUMA
1405
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001406menu "Power management options"
1407 depends on !X86_VOYAGER
1408
1409config ARCH_HIBERNATION_HEADER
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001410 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001411 depends on X86_64 && HIBERNATION
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001412
1413source "kernel/power/Kconfig"
1414
1415source "drivers/acpi/Kconfig"
1416
Andi Kleena6b68072008-01-30 13:32:49 +01001417config X86_APM_BOOT
1418 bool
1419 default y
1420 depends on APM || APM_MODULE
1421
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001422menuconfig APM
1423 tristate "APM (Advanced Power Management) BIOS support"
Ingo Molnarefefa6f2008-07-10 16:09:50 +02001424 depends on X86_32 && PM_SLEEP
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001425 ---help---
1426 APM is a BIOS specification for saving power using several different
1427 techniques. This is mostly useful for battery powered laptops with
1428 APM compliant BIOSes. If you say Y here, the system time will be
1429 reset after a RESUME operation, the /proc/apm device will provide
1430 battery status information, and user-space programs will receive
1431 notification of APM "events" (e.g. battery status change).
1432
1433 If you select "Y" here, you can disable actual use of the APM
1434 BIOS by passing the "apm=off" option to the kernel at boot time.
1435
1436 Note that the APM support is almost completely disabled for
1437 machines with more than one CPU.
1438
1439 In order to use APM, you will need supporting software. For location
Randy Dunlap53471122008-03-12 18:10:51 -04001440 and more information, read <file:Documentation/power/pm.txt> and the
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001441 Battery Powered Linux mini-HOWTO, available from
1442 <http://www.tldp.org/docs.html#howto>.
1443
1444 This driver does not spin down disk drives (see the hdparm(8)
1445 manpage ("man 8 hdparm") for that), and it doesn't turn off
1446 VESA-compliant "green" monitors.
1447
1448 This driver does not support the TI 4000M TravelMate and the ACER
1449 486/DX4/75 because they don't have compliant BIOSes. Many "green"
1450 desktop machines also don't have compliant BIOSes, and this driver
1451 may cause those machines to panic during the boot phase.
1452
1453 Generally, if you don't have a battery in your machine, there isn't
1454 much point in using this driver and you should say N. If you get
1455 random kernel OOPSes or reboots that don't seem to be related to
1456 anything, try disabling/enabling this option (or disabling/enabling
1457 APM in your BIOS).
1458
1459 Some other things you should try when experiencing seemingly random,
1460 "weird" problems:
1461
1462 1) make sure that you have enough swap space and that it is
1463 enabled.
1464 2) pass the "no-hlt" option to the kernel
1465 3) switch on floating point emulation in the kernel and pass
1466 the "no387" option to the kernel
1467 4) pass the "floppy=nodma" option to the kernel
1468 5) pass the "mem=4M" option to the kernel (thereby disabling
1469 all but the first 4 MB of RAM)
1470 6) make sure that the CPU is not over clocked.
1471 7) read the sig11 FAQ at <http://www.bitwizard.nl/sig11/>
1472 8) disable the cache from your BIOS settings
1473 9) install a fan for the video card or exchange video RAM
1474 10) install a better fan for the CPU
1475 11) exchange RAM chips
1476 12) exchange the motherboard.
1477
1478 To compile this driver as a module, choose M here: the
1479 module will be called apm.
1480
1481if APM
1482
1483config APM_IGNORE_USER_SUSPEND
1484 bool "Ignore USER SUSPEND"
1485 help
1486 This option will ignore USER SUSPEND requests. On machines with a
1487 compliant APM BIOS, you want to say N. However, on the NEC Versa M
1488 series notebooks, it is necessary to say Y because of a BIOS bug.
1489
1490config APM_DO_ENABLE
1491 bool "Enable PM at boot time"
1492 ---help---
1493 Enable APM features at boot time. From page 36 of the APM BIOS
1494 specification: "When disabled, the APM BIOS does not automatically
1495 power manage devices, enter the Standby State, enter the Suspend
1496 State, or take power saving steps in response to CPU Idle calls."
1497 This driver will make CPU Idle calls when Linux is idle (unless this
1498 feature is turned off -- see "Do CPU IDLE calls", below). This
1499 should always save battery power, but more complicated APM features
1500 will be dependent on your BIOS implementation. You may need to turn
1501 this option off if your computer hangs at boot time when using APM
1502 support, or if it beeps continuously instead of suspending. Turn
1503 this off if you have a NEC UltraLite Versa 33/C or a Toshiba
1504 T400CDT. This is off by default since most machines do fine without
1505 this feature.
1506
1507config APM_CPU_IDLE
1508 bool "Make CPU Idle calls when idle"
1509 help
1510 Enable calls to APM CPU Idle/CPU Busy inside the kernel's idle loop.
1511 On some machines, this can activate improved power savings, such as
1512 a slowed CPU clock rate, when the machine is idle. These idle calls
1513 are made after the idle loop has run for some length of time (e.g.,
1514 333 mS). On some machines, this will cause a hang at boot time or
1515 whenever the CPU becomes idle. (On machines with more than one CPU,
1516 this option does nothing.)
1517
1518config APM_DISPLAY_BLANK
1519 bool "Enable console blanking using APM"
1520 help
1521 Enable console blanking using the APM. Some laptops can use this to
1522 turn off the LCD backlight when the screen blanker of the Linux
1523 virtual console blanks the screen. Note that this is only used by
1524 the virtual console screen blanker, and won't turn off the backlight
1525 when using the X Window system. This also doesn't have anything to
1526 do with your VESA-compliant power-saving monitor. Further, this
1527 option doesn't work for all laptops -- it might not turn off your
1528 backlight at all, or it might print a lot of errors to the console,
1529 especially if you are using gpm.
1530
1531config APM_ALLOW_INTS
1532 bool "Allow interrupts during APM BIOS calls"
1533 help
1534 Normally we disable external interrupts while we are making calls to
1535 the APM BIOS as a measure to lessen the effects of a badly behaving
1536 BIOS implementation. The BIOS should reenable interrupts if it
1537 needs to. Unfortunately, some BIOSes do not -- especially those in
1538 many of the newer IBM Thinkpads. If you experience hangs when you
1539 suspend, try setting this to Y. Otherwise, say N.
1540
1541config APM_REAL_MODE_POWER_OFF
1542 bool "Use real mode APM BIOS call to power off"
1543 help
1544 Use real mode APM BIOS calls to switch off the computer. This is
1545 a work-around for a number of buggy BIOSes. Switch this option on if
1546 your computer crashes instead of powering off properly.
1547
1548endif # APM
1549
1550source "arch/x86/kernel/cpu/cpufreq/Kconfig"
1551
1552source "drivers/cpuidle/Kconfig"
1553
1554endmenu
1555
1556
1557menu "Bus options (PCI etc.)"
1558
1559config PCI
Ingo Molnar1ac97012008-05-19 14:10:14 +02001560 bool "PCI support"
Adrian Bunk1c858082008-01-30 13:32:32 +01001561 default y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001562 select ARCH_SUPPORTS_MSI if (X86_LOCAL_APIC && X86_IO_APIC)
1563 help
1564 Find out whether you have a PCI motherboard. PCI is the name of a
1565 bus system, i.e. the way the CPU talks to the other stuff inside
1566 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
1567 VESA. If you have PCI, say Y, otherwise N.
1568
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001569choice
1570 prompt "PCI access mode"
Ingo Molnarefefa6f2008-07-10 16:09:50 +02001571 depends on X86_32 && PCI
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001572 default PCI_GOANY
1573 ---help---
1574 On PCI systems, the BIOS can be used to detect the PCI devices and
1575 determine their configuration. However, some old PCI motherboards
1576 have BIOS bugs and may crash if this is done. Also, some embedded
1577 PCI-based systems don't have any BIOS at all. Linux can also try to
1578 detect the PCI hardware directly without using the BIOS.
1579
1580 With this option, you can specify how Linux should detect the
1581 PCI devices. If you choose "BIOS", the BIOS will be used,
1582 if you choose "Direct", the BIOS won't be used, and if you
1583 choose "MMConfig", then PCI Express MMCONFIG will be used.
1584 If you choose "Any", the kernel will try MMCONFIG, then the
1585 direct access method and falls back to the BIOS if that doesn't
1586 work. If unsure, go with the default, which is "Any".
1587
1588config PCI_GOBIOS
1589 bool "BIOS"
1590
1591config PCI_GOMMCONFIG
1592 bool "MMConfig"
1593
1594config PCI_GODIRECT
1595 bool "Direct"
1596
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07001597config PCI_GOOLPC
1598 bool "OLPC"
1599 depends on OLPC
1600
Andres Salomon2bdd1b02008-06-05 14:14:41 -07001601config PCI_GOANY
1602 bool "Any"
1603
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001604endchoice
1605
1606config PCI_BIOS
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001607 def_bool y
Ingo Molnarefefa6f2008-07-10 16:09:50 +02001608 depends on X86_32 && PCI && (PCI_GOBIOS || PCI_GOANY)
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001609
1610# x86-64 doesn't support PCI BIOS access from long mode so always go direct.
1611config PCI_DIRECT
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001612 def_bool y
Ingo Molnarefefa6f2008-07-10 16:09:50 +02001613 depends on PCI && (X86_64 || (PCI_GODIRECT || PCI_GOANY || PCI_GOOLPC))
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001614
1615config PCI_MMCONFIG
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001616 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001617 depends on X86_32 && PCI && ACPI && (PCI_GOMMCONFIG || PCI_GOANY)
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001618
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07001619config PCI_OLPC
Andres Salomon2bdd1b02008-06-05 14:14:41 -07001620 def_bool y
1621 depends on PCI && OLPC && (PCI_GOOLPC || PCI_GOANY)
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07001622
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001623config PCI_DOMAINS
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001624 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001625 depends on PCI
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001626
1627config PCI_MMCONFIG
1628 bool "Support mmconfig PCI config space access"
1629 depends on X86_64 && PCI && ACPI
1630
1631config DMAR
1632 bool "Support for DMA Remapping Devices (EXPERIMENTAL)"
1633 depends on X86_64 && PCI_MSI && ACPI && EXPERIMENTAL
1634 help
1635 DMA remapping (DMAR) devices support enables independent address
1636 translations for Direct Memory Access (DMA) from devices.
1637 These DMA remapping devices are reported via ACPI tables
1638 and include PCI device scope covered by these DMA
1639 remapping devices.
1640
1641config DMAR_GFX_WA
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001642 def_bool y
1643 prompt "Support for Graphics workaround"
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001644 depends on DMAR
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001645 help
1646 Current Graphics drivers tend to use physical address
1647 for DMA and avoid using DMA APIs. Setting this config
1648 option permits the IOMMU driver to set a unity map for
1649 all the OS-visible memory. Hence the driver can continue
1650 to use physical addresses for DMA.
1651
1652config DMAR_FLOPPY_WA
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001653 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001654 depends on DMAR
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001655 help
1656 Floppy disk drivers are know to bypass DMA API calls
1657 thereby failing to work when IOMMU is enabled. This
1658 workaround will setup a 1:1 mapping for the first
1659 16M to make floppy (an ISA device) work.
1660
1661source "drivers/pci/pcie/Kconfig"
1662
1663source "drivers/pci/Kconfig"
1664
1665# x86_64 have no ISA slots, but do have ISA-style DMA.
1666config ISA_DMA_API
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001667 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001668
1669if X86_32
1670
1671config ISA
1672 bool "ISA support"
Ingo Molnarefefa6f2008-07-10 16:09:50 +02001673 depends on !X86_VOYAGER
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001674 help
1675 Find out whether you have ISA slots on your motherboard. ISA is the
1676 name of a bus system, i.e. the way the CPU talks to the other stuff
1677 inside your box. Other bus systems are PCI, EISA, MicroChannel
1678 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
1679 newer boards don't support it. If you have ISA, say Y, otherwise N.
1680
1681config EISA
1682 bool "EISA support"
1683 depends on ISA
1684 ---help---
1685 The Extended Industry Standard Architecture (EISA) bus was
1686 developed as an open alternative to the IBM MicroChannel bus.
1687
1688 The EISA bus provided some of the features of the IBM MicroChannel
1689 bus while maintaining backward compatibility with cards made for
1690 the older ISA bus. The EISA bus saw limited use between 1988 and
1691 1995 when it was made obsolete by the PCI bus.
1692
1693 Say Y here if you are building a kernel for an EISA-based machine.
1694
1695 Otherwise, say N.
1696
1697source "drivers/eisa/Kconfig"
1698
1699config MCA
Ingo Molnarefefa6f2008-07-10 16:09:50 +02001700 bool "MCA support" if !X86_VOYAGER
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001701 default y if X86_VOYAGER
1702 help
1703 MicroChannel Architecture is found in some IBM PS/2 machines and
1704 laptops. It is a bus system similar to PCI or ISA. See
1705 <file:Documentation/mca.txt> (and especially the web page given
1706 there) before attempting to build an MCA bus kernel.
1707
1708source "drivers/mca/Kconfig"
1709
1710config SCx200
1711 tristate "NatSemi SCx200 support"
1712 depends on !X86_VOYAGER
1713 help
1714 This provides basic support for National Semiconductor's
1715 (now AMD's) Geode processors. The driver probes for the
1716 PCI-IDs of several on-chip devices, so its a good dependency
1717 for other scx200_* drivers.
1718
1719 If compiled as a module, the driver is named scx200.
1720
1721config SCx200HR_TIMER
1722 tristate "NatSemi SCx200 27MHz High-Resolution Timer Support"
1723 depends on SCx200 && GENERIC_TIME
1724 default y
1725 help
1726 This driver provides a clocksource built upon the on-chip
1727 27MHz high-resolution timer. Its also a workaround for
1728 NSC Geode SC-1100's buggy TSC, which loses time when the
1729 processor goes idle (as is done by the scheduler). The
1730 other workaround is idle=poll boot option.
1731
1732config GEODE_MFGPT_TIMER
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001733 def_bool y
1734 prompt "Geode Multi-Function General Purpose Timer (MFGPT) events"
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001735 depends on MGEODE_LX && GENERIC_TIME && GENERIC_CLOCKEVENTS
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001736 help
1737 This driver provides a clock event source based on the MFGPT
1738 timer(s) in the CS5535 and CS5536 companion chip for the geode.
1739 MFGPTs have a better resolution and max interval than the
1740 generic PIT, and are suitable for use as high-res timers.
1741
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07001742config OLPC
1743 bool "One Laptop Per Child support"
1744 default n
1745 help
1746 Add support for detecting the unique features of the OLPC
1747 XO hardware.
1748
Sam Ravnborgbc0120f2007-11-06 23:10:39 +01001749endif # X86_32
1750
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001751config K8_NB
1752 def_bool y
Sam Ravnborgbc0120f2007-11-06 23:10:39 +01001753 depends on AGP_AMD64 || (X86_64 && (GART_IOMMU || (PCI && NUMA)))
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001754
1755source "drivers/pcmcia/Kconfig"
1756
1757source "drivers/pci/hotplug/Kconfig"
1758
1759endmenu
1760
1761
1762menu "Executable file formats / Emulations"
1763
1764source "fs/Kconfig.binfmt"
1765
1766config IA32_EMULATION
1767 bool "IA32 Emulation"
1768 depends on X86_64
Roland McGratha97f52e2008-01-30 13:31:55 +01001769 select COMPAT_BINFMT_ELF
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001770 help
1771 Include code to run 32-bit programs under a 64-bit kernel. You should
1772 likely turn this on, unless you're 100% sure that you don't have any
1773 32-bit programs left.
1774
1775config IA32_AOUT
1776 tristate "IA32 a.out support"
David Howellsb0b933c2008-02-08 04:19:27 -08001777 depends on IA32_EMULATION && ARCH_SUPPORTS_AOUT
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001778 help
1779 Support old a.out binaries in the 32bit emulation.
1780
1781config COMPAT
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001782 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001783 depends on IA32_EMULATION
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001784
1785config COMPAT_FOR_U64_ALIGNMENT
1786 def_bool COMPAT
1787 depends on X86_64
1788
1789config SYSVIPC_COMPAT
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001790 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001791 depends on X86_64 && COMPAT && SYSVIPC
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001792
1793endmenu
1794
1795
1796source "net/Kconfig"
1797
1798source "drivers/Kconfig"
1799
1800source "drivers/firmware/Kconfig"
1801
1802source "fs/Kconfig"
1803
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001804source "arch/x86/Kconfig.debug"
1805
1806source "security/Kconfig"
1807
1808source "crypto/Kconfig"
1809
Avi Kivityedf88412007-12-16 11:02:48 +02001810source "arch/x86/kvm/Kconfig"
1811
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001812source "lib/Kconfig"