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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
David Woodhousee17c6d52008-06-17 12:19:34 +010021 select HAVE_AOUT if X86_32
Ingo Molnara5574cf2008-05-05 23:19:50 +020022 select HAVE_UNSTABLE_SCHED_CLOCK
Sam Ravnborgec7748b2008-02-09 10:46:40 +010023 select HAVE_IDE
Mathieu Desnoyers42d4b832008-02-02 15:10:34 -050024 select HAVE_OPROFILE
Rik van Riel28b2ee22008-07-23 21:27:05 -070025 select HAVE_IOREMAP_PROT
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
Ingo Molnar765c68b2008-04-09 11:03:37 +0200155config ARCH_SUPPORTS_OPTIMIZED_INLINING
156 def_bool y
157
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100158# Use the generic interrupt handling code in kernel/irq/:
159config GENERIC_HARDIRQS
160 bool
161 default y
162
163config GENERIC_IRQ_PROBE
164 bool
165 default y
166
167config GENERIC_PENDING_IRQ
168 bool
169 depends on GENERIC_HARDIRQS && SMP
170 default y
171
172config X86_SMP
173 bool
Sam Ravnborg6b0c3d42008-01-30 13:32:27 +0100174 depends on SMP && ((X86_32 && !X86_VOYAGER) || X86_64)
Jens Axboe3b16cf82008-06-26 11:21:54 +0200175 select USE_GENERIC_SMP_HELPERS
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100176 default y
177
Sam Ravnborg6b0c3d42008-01-30 13:32:27 +0100178config X86_32_SMP
179 def_bool y
180 depends on X86_32 && SMP
181
182config X86_64_SMP
183 def_bool y
184 depends on X86_64 && SMP
185
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100186config X86_HT
187 bool
Adrian Bunkee0011a2007-12-04 17:19:07 +0100188 depends on SMP
Ingo Molnarefefa6f2008-07-10 16:09:50 +0200189 depends on (X86_32 && !X86_VOYAGER) || X86_64
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100190 default y
191
192config X86_BIOS_REBOOT
193 bool
Ingo Molnar31ac4092008-07-10 13:31:04 +0200194 depends on !X86_VOYAGER
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100195 default y
196
197config X86_TRAMPOLINE
198 bool
Pavel Macheke44b7b72008-04-10 23:28:10 +0200199 depends on X86_SMP || (X86_VOYAGER && SMP) || (64BIT && ACPI_SLEEP)
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100200 default y
201
202config KTIME_SCALAR
203 def_bool X86_32
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100204source "init/Kconfig"
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100205
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100206menu "Processor type and features"
207
208source "kernel/time/Kconfig"
209
210config SMP
211 bool "Symmetric multi-processing support"
212 ---help---
213 This enables support for systems with more than one CPU. If you have
214 a system with only one CPU, like most personal computers, say N. If
215 you have a system with more than one CPU, say Y.
216
217 If you say N here, the kernel will run on single and multiprocessor
218 machines, but will use only one CPU of a multiprocessor machine. If
219 you say Y here, the kernel will run on many, but not all,
220 singleprocessor machines. On a singleprocessor machine, the kernel
221 will run faster if you say N here.
222
223 Note that if you say Y here and choose architecture "586" or
224 "Pentium" under "Processor family", the kernel will not work on 486
225 architectures. Similarly, multiprocessor kernels for the "PPro"
226 architecture may not work on all Pentium based boards.
227
228 People using multiprocessor machines who say Y here should also say
229 Y to "Enhanced Real Time Clock Support", below. The "Advanced Power
230 Management" code will be disabled if you say Y here.
231
Adrian Bunk03502fa2008-02-03 15:50:21 +0200232 See also <file:Documentation/i386/IO-APIC.txt>,
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100233 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
234 <http://www.tldp.org/docs.html#howto>.
235
236 If you don't know what to do here, say N.
237
Yinghai Lu6695c852008-06-19 12:13:09 -0700238config X86_FIND_SMP_CONFIG
239 def_bool y
Ingo Molnar1b84e1c2008-07-10 15:55:27 +0200240 depends on X86_MPPARSE || X86_VOYAGER
Yinghai Lu6695c852008-06-19 12:13:09 -0700241
242if ACPI
243config X86_MPPARSE
244 def_bool y
245 bool "Enable MPS table"
Ingo Molnar5ab74722008-07-10 14:42:03 +0200246 depends on X86_LOCAL_APIC
Yinghai Lu6695c852008-06-19 12:13:09 -0700247 help
248 For old smp systems that do not have proper acpi support. Newer systems
249 (esp with 64bit cpus) with acpi support, MADT and DSDT will override it
250endif
251
252if !ACPI
253config X86_MPPARSE
254 def_bool y
Ingo Molnar5ab74722008-07-10 14:42:03 +0200255 depends on X86_LOCAL_APIC
Yinghai Lu6695c852008-06-19 12:13:09 -0700256endif
257
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100258choice
259 prompt "Subarchitecture Type"
260 default X86_PC
261
262config X86_PC
263 bool "PC-compatible"
264 help
265 Choose this option if your computer is a standard PC or compatible.
266
267config X86_ELAN
268 bool "AMD Elan"
269 depends on X86_32
270 help
271 Select this for an AMD Elan processor.
272
273 Do not use this option for K6/Athlon/Opteron processors!
274
275 If unsure, choose "PC-compatible" instead.
276
277config X86_VOYAGER
278 bool "Voyager (NCR)"
Ingo Molnar1ac97012008-05-19 14:10:14 +0200279 depends on X86_32 && (SMP || BROKEN) && !PCI
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100280 help
281 Voyager is an MCA-based 32-way capable SMP architecture proprietary
282 to NCR Corp. Machine classes 345x/35xx/4100/51xx are Voyager-based.
283
284 *** WARNING ***
285
286 If you do not specifically know you have a Voyager based machine,
287 say N here, otherwise the kernel you build will not be bootable.
288
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100289config X86_GENERICARCH
Yinghai Lud49c4282008-06-08 18:31:54 -0700290 bool "Generic architecture"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100291 depends on X86_32
292 help
Yinghai Lud49c4282008-06-08 18:31:54 -0700293 This option compiles in the NUMAQ, Summit, bigsmp, ES7000, default
294 subarchitectures. It is intended for a generic binary kernel.
295 if you select them all, kernel will probe it one by one. and will
296 fallback to default.
297
298if X86_GENERICARCH
299
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100300config X86_NUMAQ
301 bool "NUMAQ (IBM/Sequent)"
Ingo Molnar3de352b2008-07-08 11:14:58 +0200302 depends on SMP && X86_32 && PCI && X86_MPPARSE
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100303 select NUMA
304 help
Yinghai Lud49c4282008-06-08 18:31:54 -0700305 This option is used for getting Linux to run on a NUMAQ (IBM/Sequent)
306 NUMA multiquad box. This changes the way that processors are
307 bootstrapped, and uses Clustered Logical APIC addressing mode instead
308 of Flat Logical. You will need a new lynxer.elf file to flash your
309 firmware with - send email to <Martin.Bligh@us.ibm.com>.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100310
311config X86_SUMMIT
312 bool "Summit/EXA (IBM x440)"
313 depends on X86_32 && SMP
314 help
315 This option is needed for IBM systems that use the Summit/EXA chipset.
316 In particular, it is needed for the x440.
317
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100318config X86_ES7000
319 bool "Support for Unisys ES7000 IA32 series"
320 depends on X86_32 && SMP
321 help
322 Support for Unisys ES7000 systems. Say 'Y' here if this kernel is
323 supposed to run on an IA32-based Unisys ES7000 system.
Yinghai Lud49c4282008-06-08 18:31:54 -0700324
325config X86_BIGSMP
326 bool "Support for big SMP systems with more than 8 CPUs"
327 depends on X86_32 && SMP
328 help
329 This option is needed for the systems that have more than 8 CPUs
330 and if the system is not of any sub-arch type above.
331
332endif
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100333
334config X86_VSMP
335 bool "Support for ScaleMP vSMP"
Glauber Costa96597fd2008-02-11 17:16:04 -0200336 select PARAVIRT
Ingo Molnara6784ad2008-07-10 12:21:58 +0200337 depends on X86_64 && PCI
Glauber Costa96597fd2008-02-11 17:16:04 -0200338 help
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100339 Support for ScaleMP vSMP systems. Say 'Y' here if this kernel is
340 supposed to run on these EM64T-based machines. Only choose this option
341 if you have one of these machines.
342
343endchoice
344
Ingo Molnar1b84e1c2008-07-10 15:55:27 +0200345config X86_VISWS
346 bool "SGI 320/540 (Visual Workstation)"
Ingo Molnar39415a42008-07-10 20:06:30 +0200347 depends on X86_32 && PCI && !X86_VOYAGER && X86_MPPARSE && PCI_GODIRECT
Ingo Molnar1b84e1c2008-07-10 15:55:27 +0200348 help
349 The SGI Visual Workstation series is an IA32-based workstation
350 based on SGI systems chips with some legacy PC hardware attached.
351
352 Say Y here to create a kernel to run on the SGI 320 or 540.
353
354 A kernel compiled for the Visual Workstation will run on general
355 PCs as well. See <file:Documentation/sgi-visws.txt> for details.
356
Ingo Molnar1f972762008-07-26 13:52:50 +0200357config X86_RDC321X
358 bool "RDC R-321x SoC"
359 depends on X86_32
360 select M486
361 select X86_REBOOTFIXUPS
362 help
363 This option is needed for RDC R-321x system-on-chip, also known
364 as R-8610-(G).
365 If you don't have one of these chips, you should say N here.
366
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100367config SCHED_NO_NO_OMIT_FRAME_POINTER
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100368 def_bool y
369 prompt "Single-depth WCHAN output"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100370 depends on X86_32
371 help
372 Calculate simpler /proc/<PID>/wchan values. If this option
373 is disabled then wchan values will recurse back to the
374 caller function. This provides more accurate wchan values,
375 at the expense of slightly more scheduling overhead.
376
377 If in doubt, say "Y".
378
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100379menuconfig PARAVIRT_GUEST
380 bool "Paravirtualized guest support"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100381 help
382 Say Y here to get to see options related to running Linux under
383 various hypervisors. This option alone does not add any kernel code.
384
385 If you say N, all options in this submenu will be skipped and disabled.
386
387if PARAVIRT_GUEST
388
389source "arch/x86/xen/Kconfig"
390
391config VMI
392 bool "VMI Guest support"
393 select PARAVIRT
Eduardo Pereira Habkost42d545c2008-01-30 13:33:32 +0100394 depends on X86_32
Ingo Molnarefefa6f2008-07-10 16:09:50 +0200395 depends on !X86_VOYAGER
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100396 help
397 VMI provides a paravirtualized interface to the VMware ESX server
398 (it could be used by other hypervisors in theory too, but is not
399 at the moment), by linking the kernel to a GPL-ed ROM module
400 provided by the hypervisor.
401
Glauber de Oliveira Costa790c73f2008-02-15 17:52:48 -0200402config KVM_CLOCK
403 bool "KVM paravirtualized clock"
404 select PARAVIRT
Gerd Hoffmannf6e16d52008-06-03 16:17:32 +0200405 select PARAVIRT_CLOCK
Ingo Molnarefefa6f2008-07-10 16:09:50 +0200406 depends on !X86_VOYAGER
Glauber de Oliveira Costa790c73f2008-02-15 17:52:48 -0200407 help
408 Turning on this option will allow you to run a paravirtualized clock
409 when running over the KVM hypervisor. Instead of relying on a PIT
410 (or probably other) emulation by the underlying device model, the host
411 provides the guest with timing infrastructure such as time of day, and
412 system time
413
Marcelo Tosatti0cf1bfd2008-02-22 12:21:36 -0500414config KVM_GUEST
415 bool "KVM Guest support"
416 select PARAVIRT
Ingo Molnarefefa6f2008-07-10 16:09:50 +0200417 depends on !X86_VOYAGER
Marcelo Tosatti0cf1bfd2008-02-22 12:21:36 -0500418 help
419 This option enables various optimizations for running under the KVM
420 hypervisor.
421
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100422source "arch/x86/lguest/Kconfig"
423
Eduardo Pereira Habkoste61bd942008-01-30 13:33:32 +0100424config PARAVIRT
425 bool "Enable paravirtualization code"
Ingo Molnarefefa6f2008-07-10 16:09:50 +0200426 depends on !X86_VOYAGER
Eduardo Pereira Habkoste61bd942008-01-30 13:33:32 +0100427 help
428 This changes the kernel so it can modify itself when it is run
429 under a hypervisor, potentially improving performance significantly
430 over full virtualization. However, when run without a hypervisor
431 the kernel is theoretically slower and slightly larger.
432
Gerd Hoffmann7af192c2008-06-03 16:17:29 +0200433config PARAVIRT_CLOCK
434 bool
435 default n
436
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100437endif
438
Jeremy Fitzhardinge97349132008-06-25 00:19:14 -0400439config PARAVIRT_DEBUG
440 bool "paravirt-ops debugging"
441 depends on PARAVIRT && DEBUG_KERNEL
442 help
443 Enable to debug paravirt_ops internals. Specifically, BUG if
444 a paravirt_op is missing when it is called.
445
Yinghai Lu03273182008-04-18 17:49:15 -0700446config MEMTEST
447 bool "Memtest"
Yinghai Luc64df702008-03-21 18:56:19 -0700448 help
449 This option adds a kernel parameter 'memtest', which allows memtest
Yinghai Lu03273182008-04-18 17:49:15 -0700450 to be set.
451 memtest=0, mean disabled; -- default
452 memtest=1, mean do 1 test pattern;
453 ...
454 memtest=4, mean do 4 test patterns.
Thomas Gleixneraba37282008-07-15 14:48:48 +0200455 If you are unsure how to answer this question, answer N.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100456
457config X86_SUMMIT_NUMA
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100458 def_bool y
Yinghai Lu0699eae2008-06-17 15:39:01 -0700459 depends on X86_32 && NUMA && X86_GENERICARCH
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100460
461config X86_CYCLONE_TIMER
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100462 def_bool y
Yinghai Lu0699eae2008-06-17 15:39:01 -0700463 depends on X86_GENERICARCH
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100464
465config ES7000_CLUSTERED_APIC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100466 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100467 depends on SMP && X86_ES7000 && MPENTIUMIII
468
469source "arch/x86/Kconfig.cpu"
470
471config HPET_TIMER
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100472 def_bool X86_64
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100473 prompt "HPET Timer Support" if X86_32
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100474 help
475 Use the IA-PC HPET (High Precision Event Timer) to manage
476 time in preference to the PIT and RTC, if a HPET is
477 present.
478 HPET is the next generation timer replacing legacy 8254s.
479 The HPET provides a stable time base on SMP
480 systems, unlike the TSC, but it is more expensive to access,
481 as it is off-chip. You can find the HPET spec at
482 <http://www.intel.com/hardwaredesign/hpetspec.htm>.
483
484 You can safely choose Y here. However, HPET will only be
485 activated if the platform and the BIOS support this feature.
486 Otherwise the 8254 will be used for timing services.
487
488 Choose N to continue using the legacy 8254 timer.
489
490config HPET_EMULATE_RTC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100491 def_bool y
Bernhard Walle9d8af782008-02-06 01:38:52 -0800492 depends on HPET_TIMER && (RTC=y || RTC=m || RTC_DRV_CMOS=m || RTC_DRV_CMOS=y)
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100493
494# Mark as embedded because too many people got it wrong.
495# The code disables itself when not needed.
Thomas Petazzoni7ae93922008-04-28 02:14:14 -0700496config DMI
497 default y
498 bool "Enable DMI scanning" if EMBEDDED
499 help
500 Enabled scanning of DMI to identify machine quirks. Say Y
501 here unless you have verified that your setup is not
502 affected by entries in the DMI blacklist. Required by PNP
503 BIOS code.
504
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100505config GART_IOMMU
506 bool "GART IOMMU support" if EMBEDDED
507 default y
508 select SWIOTLB
509 select AGP
510 depends on X86_64 && PCI
511 help
512 Support for full DMA access of devices with 32bit memory access only
513 on systems with more than 3GB. This is usually needed for USB,
514 sound, many IDE/SATA chipsets and some other devices.
515 Provides a driver for the AMD Athlon64/Opteron/Turion/Sempron GART
516 based hardware IOMMU and a software bounce buffer based IOMMU used
517 on Intel systems and as fallback.
518 The code is only active when needed (enough memory and limited
519 device) unless CONFIG_IOMMU_DEBUG or iommu=force is specified
520 too.
521
522config CALGARY_IOMMU
523 bool "IBM Calgary IOMMU support"
524 select SWIOTLB
525 depends on X86_64 && PCI && EXPERIMENTAL
526 help
527 Support for hardware IOMMUs in IBM's xSeries x366 and x460
528 systems. Needed to run systems with more than 3GB of memory
529 properly with 32-bit PCI devices that do not support DAC
530 (Double Address Cycle). Calgary also supports bus level
531 isolation, where all DMAs pass through the IOMMU. This
532 prevents them from going anywhere except their intended
533 destination. This catches hard-to-find kernel bugs and
534 mis-behaving drivers and devices that do not use the DMA-API
535 properly to set up their DMA buffers. The IOMMU can be
536 turned off at boot time with the iommu=off parameter.
537 Normally the kernel will make the right choice by itself.
538 If unsure, say Y.
539
540config CALGARY_IOMMU_ENABLED_BY_DEFAULT
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100541 def_bool y
542 prompt "Should Calgary be enabled by default?"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100543 depends on CALGARY_IOMMU
544 help
545 Should Calgary be enabled by default? if you choose 'y', Calgary
546 will be used (if it exists). If you choose 'n', Calgary will not be
547 used even if it exists. If you choose 'n' and would like to use
548 Calgary anyway, pass 'iommu=calgary' on the kernel command line.
549 If unsure, say Y.
550
Joerg Roedel2b188722008-06-26 21:27:37 +0200551config AMD_IOMMU
552 bool "AMD IOMMU support"
Ingo Molnar07c40e82008-06-27 11:31:28 +0200553 select SWIOTLB
Ingo Molnar24d2ba02008-06-27 10:37:03 +0200554 depends on X86_64 && PCI && ACPI
Joerg Roedel2b188722008-06-26 21:27:37 +0200555 help
Joerg Roedel18d22202008-07-03 19:35:06 +0200556 With this option you can enable support for AMD IOMMU hardware in
557 your system. An IOMMU is a hardware component which provides
558 remapping of DMA memory accesses from devices. With an AMD IOMMU you
559 can isolate the the DMA memory of different devices and protect the
560 system from misbehaving device drivers or hardware.
561
562 You can find out if your system has an AMD IOMMU if you look into
563 your BIOS for an option to enable it or if you have an IVRS ACPI
564 table.
Joerg Roedel2b188722008-06-26 21:27:37 +0200565
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100566# need this always selected by IOMMU for the VIA workaround
567config SWIOTLB
568 bool
569 help
570 Support for software bounce buffers used on x86-64 systems
571 which don't have a hardware IOMMU (e.g. the current generation
572 of Intel's x86-64 CPUs). Using this PCI devices which can only
573 access 32-bits of memory can be used on systems with more than
574 3 GB of memory. If unsure, say Y.
575
FUJITA Tomonoria8522502008-04-29 00:59:36 -0700576config IOMMU_HELPER
FUJITA Tomonori18b743d2008-07-10 09:50:50 +0900577 def_bool (CALGARY_IOMMU || GART_IOMMU || SWIOTLB || AMD_IOMMU)
Linus Torvaldsd25e26b2008-08-25 14:15:38 -0700578
Mike Travis1184dc22008-05-12 21:21:12 +0200579config MAXSMP
580 bool "Configure Maximum number of SMP Processors and NUMA Nodes"
Linus Torvaldsd25e26b2008-08-25 14:15:38 -0700581 depends on X86_64 && SMP && BROKEN
Mike Travis1184dc22008-05-12 21:21:12 +0200582 default n
583 help
584 Configure maximum number of CPUS and NUMA Nodes for this architecture.
585 If unsure, say N.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100586
587config NR_CPUS
Linus Torvaldsd25e26b2008-08-25 14:15:38 -0700588 int "Maximum number of CPUs (2-512)" if !MAXSMP
589 range 2 512
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100590 depends on SMP
Linus Torvaldsd25e26b2008-08-25 14:15:38 -0700591 default "4096" if MAXSMP
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100592 default "32" if X86_NUMAQ || X86_SUMMIT || X86_BIGSMP || X86_ES7000
593 default "8"
594 help
595 This allows you to specify the maximum number of CPUs which this
Linus Torvaldsd25e26b2008-08-25 14:15:38 -0700596 kernel will support. The maximum supported value is 512 and the
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100597 minimum value which makes sense is 2.
598
599 This is purely to save memory - each supported CPU adds
600 approximately eight kilobytes to the kernel image.
601
602config SCHED_SMT
603 bool "SMT (Hyperthreading) scheduler support"
Hiroshi Shimamotob089c122008-02-27 13:16:30 -0800604 depends on X86_HT
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100605 help
606 SMT scheduler support improves the CPU scheduler's decision making
607 when dealing with Intel Pentium 4 chips with HyperThreading at a
608 cost of slightly increased overhead in some places. If unsure say
609 N here.
610
611config SCHED_MC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100612 def_bool y
613 prompt "Multi-core scheduler support"
Hiroshi Shimamotob089c122008-02-27 13:16:30 -0800614 depends on X86_HT
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100615 help
616 Multi-core scheduler support improves the CPU scheduler's decision
617 making when dealing with multi-core CPU chips at a cost of slightly
618 increased overhead in some places. If unsure say N here.
619
620source "kernel/Kconfig.preempt"
621
622config X86_UP_APIC
623 bool "Local APIC support on uniprocessors"
Ingo Molnarefefa6f2008-07-10 16:09:50 +0200624 depends on X86_32 && !SMP && !(X86_VOYAGER || X86_GENERICARCH)
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100625 help
626 A local APIC (Advanced Programmable Interrupt Controller) is an
627 integrated interrupt controller in the CPU. If you have a single-CPU
628 system which has a processor with a local APIC, you can say Y here to
629 enable and use it. If you say Y here even though your machine doesn't
630 have a local APIC, then the kernel will still run with no slowdown at
631 all. The local APIC supports CPU-generated self-interrupts (timer,
632 performance counters), and the NMI watchdog which detects hard
633 lockups.
634
635config X86_UP_IOAPIC
636 bool "IO-APIC support on uniprocessors"
637 depends on X86_UP_APIC
638 help
639 An IO-APIC (I/O Advanced Programmable Interrupt Controller) is an
640 SMP-capable replacement for PC-style interrupt controllers. Most
641 SMP systems and many recent uniprocessor systems have one.
642
643 If you have a single-CPU system with an IO-APIC, you can say Y here
644 to use it. If you say Y here even though your machine doesn't have
645 an IO-APIC, then the kernel will still run with no slowdown at all.
646
647config X86_LOCAL_APIC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100648 def_bool y
Ingo Molnarefefa6f2008-07-10 16:09:50 +0200649 depends on X86_64 || (X86_32 && (X86_UP_APIC || (SMP && !X86_VOYAGER) || X86_GENERICARCH))
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100650
651config X86_IO_APIC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100652 def_bool y
Ingo Molnarefefa6f2008-07-10 16:09:50 +0200653 depends on X86_64 || (X86_32 && (X86_UP_IOAPIC || (SMP && !X86_VOYAGER) || X86_GENERICARCH))
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100654
655config X86_VISWS_APIC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100656 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100657 depends on X86_32 && X86_VISWS
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100658
659config X86_MCE
660 bool "Machine Check Exception"
661 depends on !X86_VOYAGER
662 ---help---
663 Machine Check Exception support allows the processor to notify the
664 kernel if it detects a problem (e.g. overheating, component failure).
665 The action the kernel takes depends on the severity of the problem,
666 ranging from a warning message on the console, to halting the machine.
667 Your processor must be a Pentium or newer to support this - check the
668 flags in /proc/cpuinfo for mce. Note that some older Pentium systems
669 have a design flaw which leads to false MCE events - hence MCE is
670 disabled on all P5 processors, unless explicitly enabled with "mce"
671 as a boot argument. Similarly, if MCE is built in and creates a
672 problem on some new non-standard machine, you can boot with "nomce"
673 to disable it. MCE support simply ignores non-MCE processors like
674 the 386 and 486, so nearly everyone can say Y here.
675
676config X86_MCE_INTEL
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100677 def_bool y
678 prompt "Intel MCE features"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100679 depends on X86_64 && X86_MCE && X86_LOCAL_APIC
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100680 help
681 Additional support for intel specific MCE features such as
682 the thermal monitor.
683
684config X86_MCE_AMD
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100685 def_bool y
686 prompt "AMD MCE features"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100687 depends on X86_64 && X86_MCE && X86_LOCAL_APIC
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100688 help
689 Additional support for AMD specific MCE features such as
690 the DRAM Error Threshold.
691
692config X86_MCE_NONFATAL
693 tristate "Check for non-fatal errors on AMD Athlon/Duron / Intel Pentium 4"
694 depends on X86_32 && X86_MCE
695 help
696 Enabling this feature starts a timer that triggers every 5 seconds which
697 will look at the machine check registers to see if anything happened.
698 Non-fatal problems automatically get corrected (but still logged).
699 Disable this if you don't want to see these messages.
700 Seeing the messages this option prints out may be indicative of dying
701 or out-of-spec (ie, overclocked) hardware.
702 This option only does something on certain CPUs.
703 (AMD Athlon/Duron and Intel Pentium 4)
704
705config X86_MCE_P4THERMAL
706 bool "check for P4 thermal throttling interrupt."
Ingo Molnarefefa6f2008-07-10 16:09:50 +0200707 depends on X86_32 && X86_MCE && (X86_UP_APIC || SMP)
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100708 help
709 Enabling this feature will cause a message to be printed when the P4
710 enters thermal throttling.
711
712config VM86
713 bool "Enable VM86 support" if EMBEDDED
714 default y
715 depends on X86_32
716 help
717 This option is required by programs like DOSEMU to run 16-bit legacy
718 code on X86 processors. It also may be needed by software like
719 XFree86 to initialize some video cards via BIOS. Disabling this
720 option saves about 6k.
721
722config TOSHIBA
723 tristate "Toshiba Laptop support"
724 depends on X86_32
725 ---help---
726 This adds a driver to safely access the System Management Mode of
727 the CPU on Toshiba portables with a genuine Toshiba BIOS. It does
728 not work on models with a Phoenix BIOS. The System Management Mode
729 is used to set the BIOS and power saving options on Toshiba portables.
730
731 For information on utilities to make use of this driver see the
732 Toshiba Linux utilities web site at:
733 <http://www.buzzard.org.uk/toshiba/>.
734
735 Say Y if you intend to run this kernel on a Toshiba portable.
736 Say N otherwise.
737
738config I8K
739 tristate "Dell laptop support"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100740 ---help---
741 This adds a driver to safely access the System Management Mode
742 of the CPU on the Dell Inspiron 8000. The System Management Mode
743 is used to read cpu temperature and cooling fan status and to
744 control the fans on the I8K portables.
745
746 This driver has been tested only on the Inspiron 8000 but it may
747 also work with other Dell laptops. You can force loading on other
748 models by passing the parameter `force=1' to the module. Use at
749 your own risk.
750
751 For information on utilities to make use of this driver see the
752 I8K Linux utilities web site at:
753 <http://people.debian.org/~dz/i8k/>
754
755 Say Y if you intend to run this kernel on a Dell Inspiron 8000.
756 Say N otherwise.
757
758config X86_REBOOTFIXUPS
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100759 def_bool n
760 prompt "Enable X86 board specific fixups for reboot"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100761 depends on X86_32 && X86
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100762 ---help---
763 This enables chipset and/or board specific fixups to be done
764 in order to get reboot to work correctly. This is only needed on
765 some combinations of hardware and BIOS. The symptom, for which
766 this config is intended, is when reboot ends with a stalled/hung
767 system.
768
769 Currently, the only fixup is for the Geode machines using
Florian Fainelli5e3a77e2008-01-30 13:33:36 +0100770 CS5530A and CS5536 chipsets and the RDC R-321x SoC.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100771
772 Say Y if you want to enable the fixup. Currently, it's safe to
773 enable this option even if you don't need it.
774 Say N otherwise.
775
776config MICROCODE
777 tristate "/dev/cpu/microcode - Intel IA32 CPU microcode support"
778 select FW_LOADER
779 ---help---
780 If you say Y here, you will be able to update the microcode on
781 Intel processors in the IA32 family, e.g. Pentium Pro, Pentium II,
782 Pentium III, Pentium 4, Xeon etc. You will obviously need the
783 actual microcode binary data itself which is not shipped with the
784 Linux kernel.
785
786 For latest news and information on obtaining all the required
787 ingredients for this driver, check:
788 <http://www.urbanmyth.org/microcode/>.
789
790 To compile this driver as a module, choose M here: the
791 module will be called microcode.
792
793config MICROCODE_OLD_INTERFACE
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100794 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100795 depends on MICROCODE
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100796
797config X86_MSR
798 tristate "/dev/cpu/*/msr - Model-specific register support"
799 help
800 This device gives privileged processes access to the x86
801 Model-Specific Registers (MSRs). It is a character device with
802 major 202 and minors 0 to 31 for /dev/cpu/0/msr to /dev/cpu/31/msr.
803 MSR accesses are directed to a specific CPU on multi-processor
804 systems.
805
806config X86_CPUID
807 tristate "/dev/cpu/*/cpuid - CPU information support"
808 help
809 This device gives processes access to the x86 CPUID instruction to
810 be executed on a specific processor. It is a character device
811 with major 203 and minors 0 to 31 for /dev/cpu/0/cpuid to
812 /dev/cpu/31/cpuid.
813
814choice
815 prompt "High Memory Support"
816 default HIGHMEM4G if !X86_NUMAQ
817 default HIGHMEM64G if X86_NUMAQ
818 depends on X86_32
819
820config NOHIGHMEM
821 bool "off"
822 depends on !X86_NUMAQ
823 ---help---
824 Linux can use up to 64 Gigabytes of physical memory on x86 systems.
825 However, the address space of 32-bit x86 processors is only 4
826 Gigabytes large. That means that, if you have a large amount of
827 physical memory, not all of it can be "permanently mapped" by the
828 kernel. The physical memory that's not permanently mapped is called
829 "high memory".
830
831 If you are compiling a kernel which will never run on a machine with
832 more than 1 Gigabyte total physical RAM, answer "off" here (default
833 choice and suitable for most users). This will result in a "3GB/1GB"
834 split: 3GB are mapped so that each process sees a 3GB virtual memory
835 space and the remaining part of the 4GB virtual memory space is used
836 by the kernel to permanently map as much physical memory as
837 possible.
838
839 If the machine has between 1 and 4 Gigabytes physical RAM, then
840 answer "4GB" here.
841
842 If more than 4 Gigabytes is used then answer "64GB" here. This
843 selection turns Intel PAE (Physical Address Extension) mode on.
844 PAE implements 3-level paging on IA32 processors. PAE is fully
845 supported by Linux, PAE mode is implemented on all recent Intel
846 processors (Pentium Pro and better). NOTE: If you say "64GB" here,
847 then the kernel will not boot on CPUs that don't support PAE!
848
849 The actual amount of total physical memory will either be
850 auto detected or can be forced by using a kernel command line option
851 such as "mem=256M". (Try "man bootparam" or see the documentation of
852 your boot loader (lilo or loadlin) about how to pass options to the
853 kernel at boot time.)
854
855 If unsure, say "off".
856
857config HIGHMEM4G
858 bool "4GB"
859 depends on !X86_NUMAQ
860 help
861 Select this if you have a 32-bit processor and between 1 and 4
862 gigabytes of physical RAM.
863
864config HIGHMEM64G
865 bool "64GB"
866 depends on !M386 && !M486
867 select X86_PAE
868 help
869 Select this if you have a 32-bit processor and more than 4
870 gigabytes of physical RAM.
871
872endchoice
873
874choice
875 depends on EXPERIMENTAL
876 prompt "Memory split" if EMBEDDED
877 default VMSPLIT_3G
878 depends on X86_32
879 help
880 Select the desired split between kernel and user memory.
881
882 If the address range available to the kernel is less than the
883 physical memory installed, the remaining memory will be available
884 as "high memory". Accessing high memory is a little more costly
885 than low memory, as it needs to be mapped into the kernel first.
886 Note that increasing the kernel address space limits the range
887 available to user programs, making the address space there
888 tighter. Selecting anything other than the default 3G/1G split
889 will also likely make your kernel incompatible with binary-only
890 kernel modules.
891
892 If you are not absolutely sure what you are doing, leave this
893 option alone!
894
895 config VMSPLIT_3G
896 bool "3G/1G user/kernel split"
897 config VMSPLIT_3G_OPT
898 depends on !X86_PAE
899 bool "3G/1G user/kernel split (for full 1G low memory)"
900 config VMSPLIT_2G
901 bool "2G/2G user/kernel split"
902 config VMSPLIT_2G_OPT
903 depends on !X86_PAE
904 bool "2G/2G user/kernel split (for full 2G low memory)"
905 config VMSPLIT_1G
906 bool "1G/3G user/kernel split"
907endchoice
908
909config PAGE_OFFSET
910 hex
911 default 0xB0000000 if VMSPLIT_3G_OPT
912 default 0x80000000 if VMSPLIT_2G
913 default 0x78000000 if VMSPLIT_2G_OPT
914 default 0x40000000 if VMSPLIT_1G
915 default 0xC0000000
916 depends on X86_32
917
918config HIGHMEM
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100919 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100920 depends on X86_32 && (HIGHMEM64G || HIGHMEM4G)
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100921
922config X86_PAE
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100923 def_bool n
924 prompt "PAE (Physical Address Extension) Support"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100925 depends on X86_32 && !HIGHMEM4G
926 select RESOURCES_64BIT
927 help
928 PAE is required for NX support, and furthermore enables
929 larger swapspace support for non-overcommit purposes. It
930 has the cost of more pagetable lookup overhead, and also
931 consumes more pagetable space per process.
932
933# Common NUMA Features
934config NUMA
935 bool "Numa Memory Allocation and Scheduler Support (EXPERIMENTAL)"
936 depends on SMP
Yinghai Lu0699eae2008-06-17 15:39:01 -0700937 depends on X86_64 || (X86_32 && HIGHMEM64G && (X86_NUMAQ || X86_BIGSMP || X86_SUMMIT && ACPI) && EXPERIMENTAL)
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100938 default n if X86_PC
Yinghai Lu0699eae2008-06-17 15:39:01 -0700939 default y if (X86_NUMAQ || X86_SUMMIT || X86_BIGSMP)
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100940 help
941 Enable NUMA (Non Uniform Memory Access) support.
942 The kernel will try to allocate memory used by a CPU on the
943 local memory controller of the CPU and add some more
944 NUMA awareness to the kernel.
945
Pavel Machek04b69442008-08-14 17:16:50 +0200946 For 32-bit this is currently highly experimental and should be only
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100947 used for kernel development. It might also cause boot failures.
Pavel Machek04b69442008-08-14 17:16:50 +0200948 For 64-bit this is recommended on all multiprocessor Opteron systems.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100949 If the system is EM64T, you should say N unless your system is
950 EM64T NUMA.
951
952comment "NUMA (Summit) requires SMP, 64GB highmem support, ACPI"
953 depends on X86_32 && X86_SUMMIT && (!HIGHMEM64G || !ACPI)
954
955config K8_NUMA
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100956 def_bool y
957 prompt "Old style AMD Opteron NUMA detection"
958 depends on X86_64 && NUMA && PCI
959 help
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100960 Enable K8 NUMA node topology detection. You should say Y here if
961 you have a multi processor AMD K8 system. This uses an old
962 method to read the NUMA configuration directly from the builtin
963 Northbridge of Opteron. It is recommended to use X86_64_ACPI_NUMA
964 instead, which also takes priority if both are compiled in.
965
966config X86_64_ACPI_NUMA
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100967 def_bool y
968 prompt "ACPI NUMA detection"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100969 depends on X86_64 && NUMA && ACPI && PCI
970 select ACPI_NUMA
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100971 help
972 Enable ACPI SRAT based node topology detection.
973
Suresh Siddha6ec6e0d2008-03-25 10:14:35 -0700974# Some NUMA nodes have memory ranges that span
975# other nodes. Even though a pfn is valid and
976# between a node's start and end pfns, it may not
977# reside on that node. See memmap_init_zone()
978# for details.
979config NODES_SPAN_OTHER_NODES
980 def_bool y
981 depends on X86_64_ACPI_NUMA
982
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100983config NUMA_EMU
984 bool "NUMA emulation"
985 depends on X86_64 && NUMA
986 help
987 Enable NUMA emulation. A flat machine will be split
988 into virtual nodes when booted with "numa=fake=N", where N is the
989 number of nodes. This is only useful for debugging.
990
991config NODES_SHIFT
Linus Torvaldsd25e26b2008-08-25 14:15:38 -0700992 int "Maximum NUMA Nodes (as a power of 2)" if !MAXSMP
Mike Travis1184dc22008-05-12 21:21:12 +0200993 range 1 9 if X86_64
Linus Torvaldsd25e26b2008-08-25 14:15:38 -0700994 default "9" if MAXSMP
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100995 default "6" if X86_64
996 default "4" if X86_NUMAQ
997 default "3"
998 depends on NEED_MULTIPLE_NODES
Mike Travis1184dc22008-05-12 21:21:12 +0200999 help
1000 Specify the maximum number of NUMA Nodes available on the target
1001 system. Increases memory reserved to accomodate various tables.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001002
1003config HAVE_ARCH_BOOTMEM_NODE
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001004 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001005 depends on X86_32 && NUMA
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001006
1007config ARCH_HAVE_MEMORY_PRESENT
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001008 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001009 depends on X86_32 && DISCONTIGMEM
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001010
1011config NEED_NODE_MEMMAP_SIZE
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001012 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001013 depends on X86_32 && (DISCONTIGMEM || SPARSEMEM)
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001014
1015config HAVE_ARCH_ALLOC_REMAP
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001016 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001017 depends on X86_32 && NUMA
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001018
1019config ARCH_FLATMEM_ENABLE
1020 def_bool y
Mel Gorman409a7b82008-01-30 13:33:25 +01001021 depends on X86_32 && ARCH_SELECT_MEMORY_MODEL && X86_PC && !NUMA
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001022
1023config ARCH_DISCONTIGMEM_ENABLE
1024 def_bool y
Christoph Lameterb2632952008-01-30 13:30:47 +01001025 depends on NUMA && X86_32
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001026
1027config ARCH_DISCONTIGMEM_DEFAULT
1028 def_bool y
Christoph Lameterb2632952008-01-30 13:30:47 +01001029 depends on NUMA && X86_32
1030
1031config ARCH_SPARSEMEM_DEFAULT
1032 def_bool y
1033 depends on X86_64
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001034
1035config ARCH_SPARSEMEM_ENABLE
1036 def_bool y
Christoph Lameterb2632952008-01-30 13:30:47 +01001037 depends on X86_64 || NUMA || (EXPERIMENTAL && X86_PC)
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001038 select SPARSEMEM_STATIC if X86_32
1039 select SPARSEMEM_VMEMMAP_ENABLE if X86_64
1040
1041config ARCH_SELECT_MEMORY_MODEL
1042 def_bool y
Christoph Lameterb2632952008-01-30 13:30:47 +01001043 depends on ARCH_SPARSEMEM_ENABLE
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001044
1045config ARCH_MEMORY_PROBE
1046 def_bool X86_64
1047 depends on MEMORY_HOTPLUG
1048
1049source "mm/Kconfig"
1050
1051config HIGHPTE
1052 bool "Allocate 3rd-level pagetables from highmem"
1053 depends on X86_32 && (HIGHMEM4G || HIGHMEM64G)
1054 help
1055 The VM uses one page table entry for each page of physical memory.
1056 For systems with a lot of RAM, this can be wasteful of precious
1057 low memory. Setting this option will put user-space page table
1058 entries in high memory.
1059
1060config MATH_EMULATION
1061 bool
1062 prompt "Math emulation" if X86_32
1063 ---help---
1064 Linux can emulate a math coprocessor (used for floating point
1065 operations) if you don't have one. 486DX and Pentium processors have
1066 a math coprocessor built in, 486SX and 386 do not, unless you added
1067 a 487DX or 387, respectively. (The messages during boot time can
1068 give you some hints here ["man dmesg"].) Everyone needs either a
1069 coprocessor or this emulation.
1070
1071 If you don't have a math coprocessor, you need to say Y here; if you
1072 say Y here even though you have a coprocessor, the coprocessor will
1073 be used nevertheless. (This behavior can be changed with the kernel
1074 command line option "no387", which comes handy if your coprocessor
1075 is broken. Try "man bootparam" or see the documentation of your boot
1076 loader (lilo or loadlin) about how to pass options to the kernel at
1077 boot time.) This means that it is a good idea to say Y here if you
1078 intend to use this kernel on different machines.
1079
1080 More information about the internals of the Linux math coprocessor
1081 emulation can be found in <file:arch/x86/math-emu/README>.
1082
1083 If you are not sure, say Y; apart from resulting in a 66 KB bigger
1084 kernel, it won't hurt.
1085
1086config MTRR
1087 bool "MTRR (Memory Type Range Register) support"
1088 ---help---
1089 On Intel P6 family processors (Pentium Pro, Pentium II and later)
1090 the Memory Type Range Registers (MTRRs) may be used to control
1091 processor access to memory ranges. This is most useful if you have
1092 a video (VGA) card on a PCI or AGP bus. Enabling write-combining
1093 allows bus write transfers to be combined into a larger transfer
1094 before bursting over the PCI/AGP bus. This can increase performance
1095 of image write operations 2.5 times or more. Saying Y here creates a
1096 /proc/mtrr file which may be used to manipulate your processor's
1097 MTRRs. Typically the X server should use this.
1098
1099 This code has a reasonably generic interface so that similar
1100 control registers on other processors can be easily supported
1101 as well:
1102
1103 The Cyrix 6x86, 6x86MX and M II processors have Address Range
1104 Registers (ARRs) which provide a similar functionality to MTRRs. For
1105 these, the ARRs are used to emulate the MTRRs.
1106 The AMD K6-2 (stepping 8 and above) and K6-3 processors have two
1107 MTRRs. The Centaur C6 (WinChip) has 8 MCRs, allowing
1108 write-combining. All of these processors are supported by this code
1109 and it makes sense to say Y here if you have one of them.
1110
1111 Saying Y here also fixes a problem with buggy SMP BIOSes which only
1112 set the MTRRs for the boot CPU and not for the secondary CPUs. This
1113 can lead to all sorts of problems, so it's good to say Y here.
1114
1115 You can safely say Y even if your machine doesn't have MTRRs, you'll
1116 just add about 9 KB to your kernel.
1117
1118 See <file:Documentation/mtrr.txt> for more information.
1119
Yinghai Lu95ffa242008-04-29 03:52:33 -07001120config MTRR_SANITIZER
Thomas Gleixneraba37282008-07-15 14:48:48 +02001121 bool
Yinghai Lu95ffa242008-04-29 03:52:33 -07001122 prompt "MTRR cleanup support"
1123 depends on MTRR
1124 help
Thomas Gleixneraba37282008-07-15 14:48:48 +02001125 Convert MTRR layout from continuous to discrete, so X drivers can
1126 add writeback entries.
Yinghai Lu95ffa242008-04-29 03:52:33 -07001127
Thomas Gleixneraba37282008-07-15 14:48:48 +02001128 Can be disabled with disable_mtrr_cleanup on the kernel command line.
1129 The largest mtrr entry size for a continous block can be set with
1130 mtrr_chunk_size.
Yinghai Lu95ffa242008-04-29 03:52:33 -07001131
Thomas Gleixneraba37282008-07-15 14:48:48 +02001132 If unsure, say N.
Yinghai Lu95ffa242008-04-29 03:52:33 -07001133
1134config MTRR_SANITIZER_ENABLE_DEFAULT
Yinghai Luf5098d62008-04-29 20:25:58 -07001135 int "MTRR cleanup enable value (0-1)"
1136 range 0 1
1137 default "0"
Yinghai Lu95ffa242008-04-29 03:52:33 -07001138 depends on MTRR_SANITIZER
1139 help
Yinghai Luf5098d62008-04-29 20:25:58 -07001140 Enable mtrr cleanup default value
Yinghai Lu95ffa242008-04-29 03:52:33 -07001141
Yinghai Lu12031a62008-05-02 02:40:22 -07001142config MTRR_SANITIZER_SPARE_REG_NR_DEFAULT
1143 int "MTRR cleanup spare reg num (0-7)"
1144 range 0 7
1145 default "1"
1146 depends on MTRR_SANITIZER
1147 help
1148 mtrr cleanup spare entries default, it can be changed via
Thomas Gleixneraba37282008-07-15 14:48:48 +02001149 mtrr_spare_reg_nr=N on the kernel command line.
Yinghai Lu12031a62008-05-02 02:40:22 -07001150
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001151config X86_PAT
Ingo Molnar2a8a2712008-04-26 10:26:52 +02001152 bool
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001153 prompt "x86 PAT support"
Ingo Molnar2a8a2712008-04-26 10:26:52 +02001154 depends on MTRR
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001155 help
1156 Use PAT attributes to setup page level cache control.
Venki Pallipadi042b78e2008-03-24 14:22:35 -07001157
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001158 PATs are the modern equivalents of MTRRs and are much more
1159 flexible than MTRRs.
1160
1161 Say N here if you see bootup problems (boot crash, boot hang,
Venki Pallipadi042b78e2008-03-24 14:22:35 -07001162 spontaneous reboots) or a non-working video driver.
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001163
1164 If unsure, say Y.
1165
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001166config EFI
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001167 def_bool n
Huang, Ying8b2cb7a2008-01-30 13:32:11 +01001168 prompt "EFI runtime service support"
Huang, Ying5b836832008-01-30 13:31:19 +01001169 depends on ACPI
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001170 ---help---
Huang, Ying8b2cb7a2008-01-30 13:32:11 +01001171 This enables the kernel to use EFI runtime services that are
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001172 available (such as the EFI variable services).
1173
Huang, Ying8b2cb7a2008-01-30 13:32:11 +01001174 This option is only useful on systems that have EFI firmware.
1175 In addition, you should use the latest ELILO loader available
1176 at <http://elilo.sourceforge.net> in order to take advantage
1177 of EFI runtime services. However, even with this option, the
1178 resultant kernel should continue to boot on existing non-EFI
1179 platforms.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001180
1181config IRQBALANCE
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001182 def_bool y
1183 prompt "Enable kernel irq balancing"
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001184 depends on X86_32 && SMP && X86_IO_APIC
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001185 help
1186 The default yes will allow the kernel to do irq load balancing.
1187 Saying no will keep the kernel from doing irq load balancing.
1188
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001189config SECCOMP
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001190 def_bool y
1191 prompt "Enable seccomp to safely compute untrusted bytecode"
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001192 depends on PROC_FS
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001193 help
1194 This kernel feature is useful for number crunching applications
1195 that may need to compute untrusted bytecode during their
1196 execution. By using pipes or other transports made available to
1197 the process as file descriptors supporting the read/write
1198 syscalls, it's possible to isolate those applications in
1199 their own address space using seccomp. Once seccomp is
1200 enabled via /proc/<pid>/seccomp, it cannot be disabled
1201 and the task is only allowed to execute a few safe syscalls
1202 defined by each seccomp mode.
1203
1204 If unsure, say Y. Only embedded should say N here.
1205
1206config CC_STACKPROTECTOR
1207 bool "Enable -fstack-protector buffer overflow detection (EXPERIMENTAL)"
Linus Torvalds2c020a92008-02-22 08:21:38 -08001208 depends on X86_64 && EXPERIMENTAL && BROKEN
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001209 help
1210 This option turns on the -fstack-protector GCC feature. This
1211 feature puts, at the beginning of critical functions, a canary
1212 value on the stack just before the return address, and validates
1213 the value just before actually returning. Stack based buffer
1214 overflows (that need to overwrite this return address) now also
1215 overwrite the canary, which gets detected and the attack is then
1216 neutralized via a kernel panic.
1217
1218 This feature requires gcc version 4.2 or above, or a distribution
1219 gcc with the feature backported. Older versions are automatically
1220 detected and for those versions, this configuration option is ignored.
1221
1222config CC_STACKPROTECTOR_ALL
1223 bool "Use stack-protector for all functions"
1224 depends on CC_STACKPROTECTOR
1225 help
1226 Normally, GCC only inserts the canary value protection for
1227 functions that use large-ish on-stack buffers. By enabling
1228 this option, GCC will be asked to do this for ALL functions.
1229
1230source kernel/Kconfig.hz
1231
1232config KEXEC
1233 bool "kexec system call"
Ingo Molnar3e8f7e32008-04-28 10:46:58 +02001234 depends on X86_BIOS_REBOOT
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001235 help
1236 kexec is a system call that implements the ability to shutdown your
1237 current kernel, and to start another kernel. It is like a reboot
1238 but it is independent of the system firmware. And like a reboot
1239 you can start any kernel with it, not just Linux.
1240
1241 The name comes from the similarity to the exec system call.
1242
1243 It is an ongoing process to be certain the hardware in a machine
1244 is properly shutdown, so do not be surprised if this code does not
1245 initially work for you. It may help to enable device hotplugging
1246 support. As of this writing the exact hardware interface is
1247 strongly in flux, so no good recommendation can be made.
1248
1249config CRASH_DUMP
Pavel Machek04b69442008-08-14 17:16:50 +02001250 bool "kernel crash dumps"
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001251 depends on X86_64 || (X86_32 && HIGHMEM)
1252 help
1253 Generate crash dump after being started by kexec.
1254 This should be normally only set in special crash dump kernels
1255 which are loaded in the main kernel with kexec-tools into
1256 a specially reserved region and then later executed after
1257 a crash by kdump/kexec. The crash dump kernel must be compiled
1258 to a memory address not used by the main kernel or BIOS using
1259 PHYSICAL_START, or it must be built as a relocatable image
1260 (CONFIG_RELOCATABLE=y).
1261 For more details see Documentation/kdump/kdump.txt
1262
Huang Ying3ab83522008-07-25 19:45:07 -07001263config KEXEC_JUMP
1264 bool "kexec jump (EXPERIMENTAL)"
1265 depends on EXPERIMENTAL
Huang Ying89081d12008-07-25 19:45:10 -07001266 depends on KEXEC && HIBERNATION && X86_32
Huang Ying3ab83522008-07-25 19:45:07 -07001267 help
Huang Ying89081d12008-07-25 19:45:10 -07001268 Jump between original kernel and kexeced kernel and invoke
1269 code in physical address mode via KEXEC
Huang Ying3ab83522008-07-25 19:45:07 -07001270
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001271config PHYSICAL_START
1272 hex "Physical address where the kernel is loaded" if (EMBEDDED || CRASH_DUMP)
1273 default "0x1000000" if X86_NUMAQ
1274 default "0x200000" if X86_64
1275 default "0x100000"
1276 help
1277 This gives the physical address where the kernel is loaded.
1278
1279 If kernel is a not relocatable (CONFIG_RELOCATABLE=n) then
1280 bzImage will decompress itself to above physical address and
1281 run from there. Otherwise, bzImage will run from the address where
1282 it has been loaded by the boot loader and will ignore above physical
1283 address.
1284
1285 In normal kdump cases one does not have to set/change this option
1286 as now bzImage can be compiled as a completely relocatable image
1287 (CONFIG_RELOCATABLE=y) and be used to load and run from a different
1288 address. This option is mainly useful for the folks who don't want
1289 to use a bzImage for capturing the crash dump and want to use a
1290 vmlinux instead. vmlinux is not relocatable hence a kernel needs
1291 to be specifically compiled to run from a specific memory area
1292 (normally a reserved region) and this option comes handy.
1293
1294 So if you are using bzImage for capturing the crash dump, leave
1295 the value here unchanged to 0x100000 and set CONFIG_RELOCATABLE=y.
1296 Otherwise if you plan to use vmlinux for capturing the crash dump
1297 change this value to start of the reserved region (Typically 16MB
1298 0x1000000). In other words, it can be set based on the "X" value as
1299 specified in the "crashkernel=YM@XM" command line boot parameter
1300 passed to the panic-ed kernel. Typically this parameter is set as
1301 crashkernel=64M@16M. Please take a look at
1302 Documentation/kdump/kdump.txt for more details about crash dumps.
1303
1304 Usage of bzImage for capturing the crash dump is recommended as
1305 one does not have to build two kernels. Same kernel can be used
1306 as production kernel and capture kernel. Above option should have
1307 gone away after relocatable bzImage support is introduced. But it
1308 is present because there are users out there who continue to use
1309 vmlinux for dump capture. This option should go away down the
1310 line.
1311
1312 Don't change this unless you know what you are doing.
1313
1314config RELOCATABLE
1315 bool "Build a relocatable kernel (EXPERIMENTAL)"
1316 depends on EXPERIMENTAL
1317 help
1318 This builds a kernel image that retains relocation information
1319 so it can be loaded someplace besides the default 1MB.
1320 The relocations tend to make the kernel binary about 10% larger,
1321 but are discarded at runtime.
1322
1323 One use is for the kexec on panic case where the recovery kernel
1324 must live at a different physical address than the primary
1325 kernel.
1326
1327 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
1328 it has been loaded at and the compile time physical address
1329 (CONFIG_PHYSICAL_START) is ignored.
1330
1331config PHYSICAL_ALIGN
1332 hex
1333 prompt "Alignment value to which kernel should be aligned" if X86_32
1334 default "0x100000" if X86_32
1335 default "0x200000" if X86_64
1336 range 0x2000 0x400000
1337 help
1338 This value puts the alignment restrictions on physical address
1339 where kernel is loaded and run from. Kernel is compiled for an
1340 address which meets above alignment restriction.
1341
1342 If bootloader loads the kernel at a non-aligned address and
1343 CONFIG_RELOCATABLE is set, kernel will move itself to nearest
1344 address aligned to above value and run from there.
1345
1346 If bootloader loads the kernel at a non-aligned address and
1347 CONFIG_RELOCATABLE is not set, kernel will ignore the run time
1348 load address and decompress itself to the address it has been
1349 compiled for and run from there. The address for which kernel is
1350 compiled already meets above alignment restrictions. Hence the
1351 end result is that kernel runs from a physical address meeting
1352 above alignment restrictions.
1353
1354 Don't change this unless you know what you are doing.
1355
1356config HOTPLUG_CPU
1357 bool "Support for suspend on SMP and hot-pluggable CPUs (EXPERIMENTAL)"
1358 depends on SMP && HOTPLUG && EXPERIMENTAL && !X86_VOYAGER
1359 ---help---
1360 Say Y here to experiment with turning CPUs off and on, and to
1361 enable suspend on SMP systems. CPUs can be controlled through
1362 /sys/devices/system/cpu.
1363 Say N if you want to disable CPU hotplug and don't need to
1364 suspend.
1365
1366config COMPAT_VDSO
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001367 def_bool y
1368 prompt "Compat VDSO support"
Roland McGrathaf65d642008-01-30 13:30:43 +01001369 depends on X86_32 || IA32_EMULATION
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001370 help
Roland McGrathaf65d642008-01-30 13:30:43 +01001371 Map the 32-bit VDSO to the predictable old-style address too.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001372 ---help---
1373 Say N here if you are running a sufficiently recent glibc
1374 version (2.3.3 or later), to remove the high-mapped
1375 VDSO mapping and to exclusively use the randomized VDSO.
1376
1377 If unsure, say Y.
1378
1379endmenu
1380
1381config ARCH_ENABLE_MEMORY_HOTPLUG
1382 def_bool y
1383 depends on X86_64 || (X86_32 && HIGHMEM)
1384
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001385config HAVE_ARCH_EARLY_PFN_TO_NID
1386 def_bool X86_64
1387 depends on NUMA
1388
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001389menu "Power management options"
1390 depends on !X86_VOYAGER
1391
1392config ARCH_HIBERNATION_HEADER
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001393 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001394 depends on X86_64 && HIBERNATION
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001395
1396source "kernel/power/Kconfig"
1397
1398source "drivers/acpi/Kconfig"
1399
Andi Kleena6b68072008-01-30 13:32:49 +01001400config X86_APM_BOOT
1401 bool
1402 default y
1403 depends on APM || APM_MODULE
1404
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001405menuconfig APM
1406 tristate "APM (Advanced Power Management) BIOS support"
Ingo Molnarefefa6f2008-07-10 16:09:50 +02001407 depends on X86_32 && PM_SLEEP
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001408 ---help---
1409 APM is a BIOS specification for saving power using several different
1410 techniques. This is mostly useful for battery powered laptops with
1411 APM compliant BIOSes. If you say Y here, the system time will be
1412 reset after a RESUME operation, the /proc/apm device will provide
1413 battery status information, and user-space programs will receive
1414 notification of APM "events" (e.g. battery status change).
1415
1416 If you select "Y" here, you can disable actual use of the APM
1417 BIOS by passing the "apm=off" option to the kernel at boot time.
1418
1419 Note that the APM support is almost completely disabled for
1420 machines with more than one CPU.
1421
1422 In order to use APM, you will need supporting software. For location
Randy Dunlap53471122008-03-12 18:10:51 -04001423 and more information, read <file:Documentation/power/pm.txt> and the
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001424 Battery Powered Linux mini-HOWTO, available from
1425 <http://www.tldp.org/docs.html#howto>.
1426
1427 This driver does not spin down disk drives (see the hdparm(8)
1428 manpage ("man 8 hdparm") for that), and it doesn't turn off
1429 VESA-compliant "green" monitors.
1430
1431 This driver does not support the TI 4000M TravelMate and the ACER
1432 486/DX4/75 because they don't have compliant BIOSes. Many "green"
1433 desktop machines also don't have compliant BIOSes, and this driver
1434 may cause those machines to panic during the boot phase.
1435
1436 Generally, if you don't have a battery in your machine, there isn't
1437 much point in using this driver and you should say N. If you get
1438 random kernel OOPSes or reboots that don't seem to be related to
1439 anything, try disabling/enabling this option (or disabling/enabling
1440 APM in your BIOS).
1441
1442 Some other things you should try when experiencing seemingly random,
1443 "weird" problems:
1444
1445 1) make sure that you have enough swap space and that it is
1446 enabled.
1447 2) pass the "no-hlt" option to the kernel
1448 3) switch on floating point emulation in the kernel and pass
1449 the "no387" option to the kernel
1450 4) pass the "floppy=nodma" option to the kernel
1451 5) pass the "mem=4M" option to the kernel (thereby disabling
1452 all but the first 4 MB of RAM)
1453 6) make sure that the CPU is not over clocked.
1454 7) read the sig11 FAQ at <http://www.bitwizard.nl/sig11/>
1455 8) disable the cache from your BIOS settings
1456 9) install a fan for the video card or exchange video RAM
1457 10) install a better fan for the CPU
1458 11) exchange RAM chips
1459 12) exchange the motherboard.
1460
1461 To compile this driver as a module, choose M here: the
1462 module will be called apm.
1463
1464if APM
1465
1466config APM_IGNORE_USER_SUSPEND
1467 bool "Ignore USER SUSPEND"
1468 help
1469 This option will ignore USER SUSPEND requests. On machines with a
1470 compliant APM BIOS, you want to say N. However, on the NEC Versa M
1471 series notebooks, it is necessary to say Y because of a BIOS bug.
1472
1473config APM_DO_ENABLE
1474 bool "Enable PM at boot time"
1475 ---help---
1476 Enable APM features at boot time. From page 36 of the APM BIOS
1477 specification: "When disabled, the APM BIOS does not automatically
1478 power manage devices, enter the Standby State, enter the Suspend
1479 State, or take power saving steps in response to CPU Idle calls."
1480 This driver will make CPU Idle calls when Linux is idle (unless this
1481 feature is turned off -- see "Do CPU IDLE calls", below). This
1482 should always save battery power, but more complicated APM features
1483 will be dependent on your BIOS implementation. You may need to turn
1484 this option off if your computer hangs at boot time when using APM
1485 support, or if it beeps continuously instead of suspending. Turn
1486 this off if you have a NEC UltraLite Versa 33/C or a Toshiba
1487 T400CDT. This is off by default since most machines do fine without
1488 this feature.
1489
1490config APM_CPU_IDLE
1491 bool "Make CPU Idle calls when idle"
1492 help
1493 Enable calls to APM CPU Idle/CPU Busy inside the kernel's idle loop.
1494 On some machines, this can activate improved power savings, such as
1495 a slowed CPU clock rate, when the machine is idle. These idle calls
1496 are made after the idle loop has run for some length of time (e.g.,
1497 333 mS). On some machines, this will cause a hang at boot time or
1498 whenever the CPU becomes idle. (On machines with more than one CPU,
1499 this option does nothing.)
1500
1501config APM_DISPLAY_BLANK
1502 bool "Enable console blanking using APM"
1503 help
1504 Enable console blanking using the APM. Some laptops can use this to
1505 turn off the LCD backlight when the screen blanker of the Linux
1506 virtual console blanks the screen. Note that this is only used by
1507 the virtual console screen blanker, and won't turn off the backlight
1508 when using the X Window system. This also doesn't have anything to
1509 do with your VESA-compliant power-saving monitor. Further, this
1510 option doesn't work for all laptops -- it might not turn off your
1511 backlight at all, or it might print a lot of errors to the console,
1512 especially if you are using gpm.
1513
1514config APM_ALLOW_INTS
1515 bool "Allow interrupts during APM BIOS calls"
1516 help
1517 Normally we disable external interrupts while we are making calls to
1518 the APM BIOS as a measure to lessen the effects of a badly behaving
1519 BIOS implementation. The BIOS should reenable interrupts if it
1520 needs to. Unfortunately, some BIOSes do not -- especially those in
1521 many of the newer IBM Thinkpads. If you experience hangs when you
1522 suspend, try setting this to Y. Otherwise, say N.
1523
1524config APM_REAL_MODE_POWER_OFF
1525 bool "Use real mode APM BIOS call to power off"
1526 help
1527 Use real mode APM BIOS calls to switch off the computer. This is
1528 a work-around for a number of buggy BIOSes. Switch this option on if
1529 your computer crashes instead of powering off properly.
1530
1531endif # APM
1532
1533source "arch/x86/kernel/cpu/cpufreq/Kconfig"
1534
1535source "drivers/cpuidle/Kconfig"
1536
1537endmenu
1538
1539
1540menu "Bus options (PCI etc.)"
1541
1542config PCI
Ingo Molnar1ac97012008-05-19 14:10:14 +02001543 bool "PCI support"
Adrian Bunk1c858082008-01-30 13:32:32 +01001544 default y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001545 select ARCH_SUPPORTS_MSI if (X86_LOCAL_APIC && X86_IO_APIC)
1546 help
1547 Find out whether you have a PCI motherboard. PCI is the name of a
1548 bus system, i.e. the way the CPU talks to the other stuff inside
1549 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
1550 VESA. If you have PCI, say Y, otherwise N.
1551
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001552choice
1553 prompt "PCI access mode"
Ingo Molnarefefa6f2008-07-10 16:09:50 +02001554 depends on X86_32 && PCI
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001555 default PCI_GOANY
1556 ---help---
1557 On PCI systems, the BIOS can be used to detect the PCI devices and
1558 determine their configuration. However, some old PCI motherboards
1559 have BIOS bugs and may crash if this is done. Also, some embedded
1560 PCI-based systems don't have any BIOS at all. Linux can also try to
1561 detect the PCI hardware directly without using the BIOS.
1562
1563 With this option, you can specify how Linux should detect the
1564 PCI devices. If you choose "BIOS", the BIOS will be used,
1565 if you choose "Direct", the BIOS won't be used, and if you
1566 choose "MMConfig", then PCI Express MMCONFIG will be used.
1567 If you choose "Any", the kernel will try MMCONFIG, then the
1568 direct access method and falls back to the BIOS if that doesn't
1569 work. If unsure, go with the default, which is "Any".
1570
1571config PCI_GOBIOS
1572 bool "BIOS"
1573
1574config PCI_GOMMCONFIG
1575 bool "MMConfig"
1576
1577config PCI_GODIRECT
1578 bool "Direct"
1579
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07001580config PCI_GOOLPC
1581 bool "OLPC"
1582 depends on OLPC
1583
Andres Salomon2bdd1b02008-06-05 14:14:41 -07001584config PCI_GOANY
1585 bool "Any"
1586
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001587endchoice
1588
1589config PCI_BIOS
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001590 def_bool y
Ingo Molnarefefa6f2008-07-10 16:09:50 +02001591 depends on X86_32 && PCI && (PCI_GOBIOS || PCI_GOANY)
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001592
1593# x86-64 doesn't support PCI BIOS access from long mode so always go direct.
1594config PCI_DIRECT
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001595 def_bool y
Ingo Molnarefefa6f2008-07-10 16:09:50 +02001596 depends on PCI && (X86_64 || (PCI_GODIRECT || PCI_GOANY || PCI_GOOLPC))
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001597
1598config PCI_MMCONFIG
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001599 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001600 depends on X86_32 && PCI && ACPI && (PCI_GOMMCONFIG || PCI_GOANY)
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001601
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07001602config PCI_OLPC
Andres Salomon2bdd1b02008-06-05 14:14:41 -07001603 def_bool y
1604 depends on PCI && OLPC && (PCI_GOOLPC || PCI_GOANY)
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07001605
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001606config PCI_DOMAINS
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001607 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001608 depends on PCI
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001609
1610config PCI_MMCONFIG
1611 bool "Support mmconfig PCI config space access"
1612 depends on X86_64 && PCI && ACPI
1613
1614config DMAR
1615 bool "Support for DMA Remapping Devices (EXPERIMENTAL)"
1616 depends on X86_64 && PCI_MSI && ACPI && EXPERIMENTAL
1617 help
1618 DMA remapping (DMAR) devices support enables independent address
1619 translations for Direct Memory Access (DMA) from devices.
1620 These DMA remapping devices are reported via ACPI tables
1621 and include PCI device scope covered by these DMA
1622 remapping devices.
1623
1624config DMAR_GFX_WA
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001625 def_bool y
1626 prompt "Support for Graphics workaround"
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001627 depends on DMAR
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001628 help
1629 Current Graphics drivers tend to use physical address
1630 for DMA and avoid using DMA APIs. Setting this config
1631 option permits the IOMMU driver to set a unity map for
1632 all the OS-visible memory. Hence the driver can continue
1633 to use physical addresses for DMA.
1634
1635config DMAR_FLOPPY_WA
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001636 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001637 depends on DMAR
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001638 help
1639 Floppy disk drivers are know to bypass DMA API calls
1640 thereby failing to work when IOMMU is enabled. This
1641 workaround will setup a 1:1 mapping for the first
1642 16M to make floppy (an ISA device) work.
1643
1644source "drivers/pci/pcie/Kconfig"
1645
1646source "drivers/pci/Kconfig"
1647
1648# x86_64 have no ISA slots, but do have ISA-style DMA.
1649config ISA_DMA_API
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001650 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001651
1652if X86_32
1653
1654config ISA
1655 bool "ISA support"
Ingo Molnarefefa6f2008-07-10 16:09:50 +02001656 depends on !X86_VOYAGER
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001657 help
1658 Find out whether you have ISA slots on your motherboard. ISA is the
1659 name of a bus system, i.e. the way the CPU talks to the other stuff
1660 inside your box. Other bus systems are PCI, EISA, MicroChannel
1661 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
1662 newer boards don't support it. If you have ISA, say Y, otherwise N.
1663
1664config EISA
1665 bool "EISA support"
1666 depends on ISA
1667 ---help---
1668 The Extended Industry Standard Architecture (EISA) bus was
1669 developed as an open alternative to the IBM MicroChannel bus.
1670
1671 The EISA bus provided some of the features of the IBM MicroChannel
1672 bus while maintaining backward compatibility with cards made for
1673 the older ISA bus. The EISA bus saw limited use between 1988 and
1674 1995 when it was made obsolete by the PCI bus.
1675
1676 Say Y here if you are building a kernel for an EISA-based machine.
1677
1678 Otherwise, say N.
1679
1680source "drivers/eisa/Kconfig"
1681
1682config MCA
Ingo Molnarefefa6f2008-07-10 16:09:50 +02001683 bool "MCA support" if !X86_VOYAGER
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001684 default y if X86_VOYAGER
1685 help
1686 MicroChannel Architecture is found in some IBM PS/2 machines and
1687 laptops. It is a bus system similar to PCI or ISA. See
1688 <file:Documentation/mca.txt> (and especially the web page given
1689 there) before attempting to build an MCA bus kernel.
1690
1691source "drivers/mca/Kconfig"
1692
1693config SCx200
1694 tristate "NatSemi SCx200 support"
1695 depends on !X86_VOYAGER
1696 help
1697 This provides basic support for National Semiconductor's
1698 (now AMD's) Geode processors. The driver probes for the
1699 PCI-IDs of several on-chip devices, so its a good dependency
1700 for other scx200_* drivers.
1701
1702 If compiled as a module, the driver is named scx200.
1703
1704config SCx200HR_TIMER
1705 tristate "NatSemi SCx200 27MHz High-Resolution Timer Support"
1706 depends on SCx200 && GENERIC_TIME
1707 default y
1708 help
1709 This driver provides a clocksource built upon the on-chip
1710 27MHz high-resolution timer. Its also a workaround for
1711 NSC Geode SC-1100's buggy TSC, which loses time when the
1712 processor goes idle (as is done by the scheduler). The
1713 other workaround is idle=poll boot option.
1714
1715config GEODE_MFGPT_TIMER
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001716 def_bool y
1717 prompt "Geode Multi-Function General Purpose Timer (MFGPT) events"
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001718 depends on MGEODE_LX && GENERIC_TIME && GENERIC_CLOCKEVENTS
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001719 help
1720 This driver provides a clock event source based on the MFGPT
1721 timer(s) in the CS5535 and CS5536 companion chip for the geode.
1722 MFGPTs have a better resolution and max interval than the
1723 generic PIT, and are suitable for use as high-res timers.
1724
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07001725config OLPC
1726 bool "One Laptop Per Child support"
1727 default n
1728 help
1729 Add support for detecting the unique features of the OLPC
1730 XO hardware.
1731
Sam Ravnborgbc0120f2007-11-06 23:10:39 +01001732endif # X86_32
1733
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001734config K8_NB
1735 def_bool y
Sam Ravnborgbc0120f2007-11-06 23:10:39 +01001736 depends on AGP_AMD64 || (X86_64 && (GART_IOMMU || (PCI && NUMA)))
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001737
1738source "drivers/pcmcia/Kconfig"
1739
1740source "drivers/pci/hotplug/Kconfig"
1741
1742endmenu
1743
1744
1745menu "Executable file formats / Emulations"
1746
1747source "fs/Kconfig.binfmt"
1748
1749config IA32_EMULATION
1750 bool "IA32 Emulation"
1751 depends on X86_64
Roland McGratha97f52e2008-01-30 13:31:55 +01001752 select COMPAT_BINFMT_ELF
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001753 help
1754 Include code to run 32-bit programs under a 64-bit kernel. You should
1755 likely turn this on, unless you're 100% sure that you don't have any
1756 32-bit programs left.
1757
1758config IA32_AOUT
1759 tristate "IA32 a.out support"
David Woodhouse6b213e12008-06-16 12:39:13 +01001760 depends on IA32_EMULATION
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001761 help
1762 Support old a.out binaries in the 32bit emulation.
1763
1764config COMPAT
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001765 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001766 depends on IA32_EMULATION
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001767
1768config COMPAT_FOR_U64_ALIGNMENT
1769 def_bool COMPAT
1770 depends on X86_64
1771
1772config SYSVIPC_COMPAT
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001773 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001774 depends on X86_64 && COMPAT && SYSVIPC
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001775
1776endmenu
1777
1778
1779source "net/Kconfig"
1780
1781source "drivers/Kconfig"
1782
1783source "drivers/firmware/Kconfig"
1784
1785source "fs/Kconfig"
1786
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001787source "arch/x86/Kconfig.debug"
1788
1789source "security/Kconfig"
1790
1791source "crypto/Kconfig"
1792
Avi Kivityedf88412007-12-16 11:02:48 +02001793source "arch/x86/kvm/Kconfig"
1794
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001795source "lib/Kconfig"