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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
Mathieu Desnoyers3f550092008-02-02 15:10:35 -050025 select HAVE_KPROBES
Ingo Molnar1f972762008-07-26 13:52:50 +020026 select ARCH_WANT_OPTIONAL_GPIOLIB
Ananth N Mavinakayanahalli9edddaa2008-03-04 14:28:37 -080027 select HAVE_KRETPROBES
Steven Rostedt677aa9f2008-05-17 00:01:36 -040028 select HAVE_DYNAMIC_FTRACE
Arnaldo Carvalho de Melo16444a82008-05-12 21:20:42 +020029 select HAVE_FTRACE
Randy Dunlap1a4e3f82008-02-20 09:20:08 -080030 select HAVE_KVM if ((X86_32 && !X86_VOYAGER && !X86_VISWS && !X86_NUMAQ) || X86_64)
Ingo Molnarfcbc04c2008-04-21 13:39:53 +020031 select HAVE_ARCH_KGDB if !X86_VOYAGER
Dmitry Baryshkov323ec002008-06-29 14:19:31 +040032 select HAVE_GENERIC_DMA_COHERENT if X86_32
Johannes Berg58340a02008-07-25 01:45:33 -070033 select HAVE_EFFICIENT_UNALIGNED_ACCESS
Balbir Singh7d8330a2008-02-10 12:46:28 +053034
Sam Ravnborg73531902008-05-25 23:03:18 +020035config ARCH_DEFCONFIG
Sam Ravnborgb9b39bf2008-04-29 12:48:15 +020036 string
Sam Ravnborg73531902008-05-25 23:03:18 +020037 default "arch/x86/configs/i386_defconfig" if X86_32
38 default "arch/x86/configs/x86_64_defconfig" if X86_64
Sam Ravnborgb9b39bf2008-04-29 12:48:15 +020039
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010040
Nick Piggin95c354f2008-01-30 13:31:20 +010041config GENERIC_LOCKBREAK
Nick Piggin314cdbe2008-01-30 13:31:21 +010042 def_bool n
Nick Piggin95c354f2008-01-30 13:31:20 +010043
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010044config GENERIC_TIME
Harvey Harrison3c2362e2008-01-30 13:31:03 +010045 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010046
47config GENERIC_CMOS_UPDATE
Harvey Harrison3c2362e2008-01-30 13:31:03 +010048 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010049
50config CLOCKSOURCE_WATCHDOG
Harvey Harrison3c2362e2008-01-30 13:31:03 +010051 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010052
53config GENERIC_CLOCKEVENTS
Harvey Harrison3c2362e2008-01-30 13:31:03 +010054 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010055
56config GENERIC_CLOCKEVENTS_BROADCAST
Harvey Harrison3c2362e2008-01-30 13:31:03 +010057 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010058 depends on X86_64 || (X86_32 && X86_LOCAL_APIC)
59
60config LOCKDEP_SUPPORT
Harvey Harrison3c2362e2008-01-30 13:31:03 +010061 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010062
63config STACKTRACE_SUPPORT
Harvey Harrison3c2362e2008-01-30 13:31:03 +010064 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010065
Heiko Carstensaa7d9352008-02-01 17:45:14 +010066config HAVE_LATENCYTOP_SUPPORT
67 def_bool y
68
Christoph Lameter1f842602008-01-07 23:20:30 -080069config FAST_CMPXCHG_LOCAL
70 bool
71 default y
72
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010073config MMU
Harvey Harrison3c2362e2008-01-30 13:31:03 +010074 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010075
76config ZONE_DMA
Harvey Harrison3c2362e2008-01-30 13:31:03 +010077 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010078
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010079config SBUS
80 bool
81
82config GENERIC_ISA_DMA
Harvey Harrison3c2362e2008-01-30 13:31:03 +010083 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010084
85config GENERIC_IOMAP
Harvey Harrison3c2362e2008-01-30 13:31:03 +010086 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010087
88config GENERIC_BUG
Harvey Harrison3c2362e2008-01-30 13:31:03 +010089 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010090 depends on BUG
91
92config GENERIC_HWEIGHT
Harvey Harrison3c2362e2008-01-30 13:31:03 +010093 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010094
Florian Fainellia6082952008-01-30 13:33:35 +010095config GENERIC_GPIO
96 def_bool n
97
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010098config ARCH_MAY_HAVE_PC_FDC
Harvey Harrison3c2362e2008-01-30 13:31:03 +010099 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100100
Sam Ravnborg1032c0b2007-11-06 21:35:08 +0100101config RWSEM_GENERIC_SPINLOCK
102 def_bool !X86_XADD
103
104config RWSEM_XCHGADD_ALGORITHM
105 def_bool X86_XADD
106
107config ARCH_HAS_ILOG2_U32
108 def_bool n
109
110config ARCH_HAS_ILOG2_U64
111 def_bool n
112
Venki Pallipadia6869cc2008-02-08 17:05:44 -0800113config ARCH_HAS_CPU_IDLE_WAIT
114 def_bool y
115
Sam Ravnborg1032c0b2007-11-06 21:35:08 +0100116config GENERIC_CALIBRATE_DELAY
117 def_bool y
118
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100119config GENERIC_TIME_VSYSCALL
120 bool
121 default X86_64
122
venkatesh.pallipadi@intel.com9a0b8412008-01-31 17:35:06 -0800123config ARCH_HAS_CPU_RELAX
124 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100125
Pekka Enberg1b27d052008-04-28 02:12:22 -0700126config ARCH_HAS_CACHE_LINE_SIZE
127 def_bool y
128
Mike Travisdd5af902008-01-30 13:33:32 +0100129config HAVE_SETUP_PER_CPU_AREA
Mike Travis23ca4bb2008-05-12 21:21:12 +0200130 def_bool X86_64_SMP || (X86_SMP && !X86_VOYAGER)
travis@sgi.comb32ef632008-01-30 13:32:51 +0100131
Mike Travis9f0e8d02008-04-04 18:11:01 -0700132config HAVE_CPUMASK_OF_CPU_MAP
133 def_bool X86_64_SMP
134
Johannes Berg801e4062007-12-08 02:12:39 +0100135config ARCH_HIBERNATION_POSSIBLE
136 def_bool y
137 depends on !SMP || !X86_VOYAGER
138
Johannes Bergf4cb5702007-12-08 02:14:00 +0100139config ARCH_SUSPEND_POSSIBLE
140 def_bool y
141 depends on !X86_VOYAGER
142
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100143config ZONE_DMA32
144 bool
145 default X86_64
146
147config ARCH_POPULATES_NODE_MAP
148 def_bool y
149
150config AUDIT_ARCH
151 bool
152 default X86_64
153
David Howellsb0b933c2008-02-08 04:19:27 -0800154config ARCH_SUPPORTS_AOUT
155 def_bool y
156
Ingo Molnar765c68b2008-04-09 11:03:37 +0200157config ARCH_SUPPORTS_OPTIMIZED_INLINING
158 def_bool y
159
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100160# Use the generic interrupt handling code in kernel/irq/:
161config GENERIC_HARDIRQS
162 bool
163 default y
164
165config GENERIC_IRQ_PROBE
166 bool
167 default y
168
169config GENERIC_PENDING_IRQ
170 bool
171 depends on GENERIC_HARDIRQS && SMP
172 default y
173
174config X86_SMP
175 bool
Sam Ravnborg6b0c3d42008-01-30 13:32:27 +0100176 depends on SMP && ((X86_32 && !X86_VOYAGER) || X86_64)
Jens Axboe3b16cf82008-06-26 11:21:54 +0200177 select USE_GENERIC_SMP_HELPERS
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100178 default y
179
Sam Ravnborg6b0c3d42008-01-30 13:32:27 +0100180config X86_32_SMP
181 def_bool y
182 depends on X86_32 && SMP
183
184config X86_64_SMP
185 def_bool y
186 depends on X86_64 && SMP
187
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100188config X86_HT
189 bool
Adrian Bunkee0011a2007-12-04 17:19:07 +0100190 depends on SMP
Ingo Molnarefefa6f2008-07-10 16:09:50 +0200191 depends on (X86_32 && !X86_VOYAGER) || X86_64
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100192 default y
193
194config X86_BIOS_REBOOT
195 bool
Ingo Molnar31ac4092008-07-10 13:31:04 +0200196 depends on !X86_VOYAGER
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100197 default y
198
199config X86_TRAMPOLINE
200 bool
Pavel Macheke44b7b72008-04-10 23:28:10 +0200201 depends on X86_SMP || (X86_VOYAGER && SMP) || (64BIT && ACPI_SLEEP)
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100202 default y
203
204config KTIME_SCALAR
205 def_bool X86_32
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100206source "init/Kconfig"
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100207
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100208menu "Processor type and features"
209
210source "kernel/time/Kconfig"
211
212config SMP
213 bool "Symmetric multi-processing support"
214 ---help---
215 This enables support for systems with more than one CPU. If you have
216 a system with only one CPU, like most personal computers, say N. If
217 you have a system with more than one CPU, say Y.
218
219 If you say N here, the kernel will run on single and multiprocessor
220 machines, but will use only one CPU of a multiprocessor machine. If
221 you say Y here, the kernel will run on many, but not all,
222 singleprocessor machines. On a singleprocessor machine, the kernel
223 will run faster if you say N here.
224
225 Note that if you say Y here and choose architecture "586" or
226 "Pentium" under "Processor family", the kernel will not work on 486
227 architectures. Similarly, multiprocessor kernels for the "PPro"
228 architecture may not work on all Pentium based boards.
229
230 People using multiprocessor machines who say Y here should also say
231 Y to "Enhanced Real Time Clock Support", below. The "Advanced Power
232 Management" code will be disabled if you say Y here.
233
Adrian Bunk03502fa2008-02-03 15:50:21 +0200234 See also <file:Documentation/i386/IO-APIC.txt>,
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100235 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
236 <http://www.tldp.org/docs.html#howto>.
237
238 If you don't know what to do here, say N.
239
Yinghai Lu6695c852008-06-19 12:13:09 -0700240config X86_FIND_SMP_CONFIG
241 def_bool y
Ingo Molnar1b84e1c2008-07-10 15:55:27 +0200242 depends on X86_MPPARSE || X86_VOYAGER
Yinghai Lu6695c852008-06-19 12:13:09 -0700243
244if ACPI
245config X86_MPPARSE
246 def_bool y
247 bool "Enable MPS table"
Ingo Molnar5ab74722008-07-10 14:42:03 +0200248 depends on X86_LOCAL_APIC
Yinghai Lu6695c852008-06-19 12:13:09 -0700249 help
250 For old smp systems that do not have proper acpi support. Newer systems
251 (esp with 64bit cpus) with acpi support, MADT and DSDT will override it
252endif
253
254if !ACPI
255config X86_MPPARSE
256 def_bool y
Ingo Molnar5ab74722008-07-10 14:42:03 +0200257 depends on X86_LOCAL_APIC
Yinghai Lu6695c852008-06-19 12:13:09 -0700258endif
259
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100260choice
261 prompt "Subarchitecture Type"
262 default X86_PC
263
264config X86_PC
265 bool "PC-compatible"
266 help
267 Choose this option if your computer is a standard PC or compatible.
268
269config X86_ELAN
270 bool "AMD Elan"
271 depends on X86_32
272 help
273 Select this for an AMD Elan processor.
274
275 Do not use this option for K6/Athlon/Opteron processors!
276
277 If unsure, choose "PC-compatible" instead.
278
279config X86_VOYAGER
280 bool "Voyager (NCR)"
Ingo Molnar1ac97012008-05-19 14:10:14 +0200281 depends on X86_32 && (SMP || BROKEN) && !PCI
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100282 help
283 Voyager is an MCA-based 32-way capable SMP architecture proprietary
284 to NCR Corp. Machine classes 345x/35xx/4100/51xx are Voyager-based.
285
286 *** WARNING ***
287
288 If you do not specifically know you have a Voyager based machine,
289 say N here, otherwise the kernel you build will not be bootable.
290
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100291config X86_GENERICARCH
Yinghai Lud49c4282008-06-08 18:31:54 -0700292 bool "Generic architecture"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100293 depends on X86_32
294 help
Yinghai Lud49c4282008-06-08 18:31:54 -0700295 This option compiles in the NUMAQ, Summit, bigsmp, ES7000, default
296 subarchitectures. It is intended for a generic binary kernel.
297 if you select them all, kernel will probe it one by one. and will
298 fallback to default.
299
300if X86_GENERICARCH
301
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100302config X86_NUMAQ
303 bool "NUMAQ (IBM/Sequent)"
Ingo Molnar3de352b2008-07-08 11:14:58 +0200304 depends on SMP && X86_32 && PCI && X86_MPPARSE
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100305 select NUMA
306 help
Yinghai Lud49c4282008-06-08 18:31:54 -0700307 This option is used for getting Linux to run on a NUMAQ (IBM/Sequent)
308 NUMA multiquad box. This changes the way that processors are
309 bootstrapped, and uses Clustered Logical APIC addressing mode instead
310 of Flat Logical. You will need a new lynxer.elf file to flash your
311 firmware with - send email to <Martin.Bligh@us.ibm.com>.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100312
313config X86_SUMMIT
314 bool "Summit/EXA (IBM x440)"
315 depends on X86_32 && SMP
316 help
317 This option is needed for IBM systems that use the Summit/EXA chipset.
318 In particular, it is needed for the x440.
319
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100320config X86_ES7000
321 bool "Support for Unisys ES7000 IA32 series"
322 depends on X86_32 && SMP
323 help
324 Support for Unisys ES7000 systems. Say 'Y' here if this kernel is
325 supposed to run on an IA32-based Unisys ES7000 system.
Yinghai Lud49c4282008-06-08 18:31:54 -0700326
327config X86_BIGSMP
328 bool "Support for big SMP systems with more than 8 CPUs"
329 depends on X86_32 && SMP
330 help
331 This option is needed for the systems that have more than 8 CPUs
332 and if the system is not of any sub-arch type above.
333
334endif
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100335
336config X86_VSMP
337 bool "Support for ScaleMP vSMP"
Glauber Costa96597fd2008-02-11 17:16:04 -0200338 select PARAVIRT
Ingo Molnara6784ad2008-07-10 12:21:58 +0200339 depends on X86_64 && PCI
Glauber Costa96597fd2008-02-11 17:16:04 -0200340 help
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100341 Support for ScaleMP vSMP systems. Say 'Y' here if this kernel is
342 supposed to run on these EM64T-based machines. Only choose this option
343 if you have one of these machines.
344
345endchoice
346
Ingo Molnar1b84e1c2008-07-10 15:55:27 +0200347config X86_VISWS
348 bool "SGI 320/540 (Visual Workstation)"
Ingo Molnar39415a42008-07-10 20:06:30 +0200349 depends on X86_32 && PCI && !X86_VOYAGER && X86_MPPARSE && PCI_GODIRECT
Ingo Molnar1b84e1c2008-07-10 15:55:27 +0200350 help
351 The SGI Visual Workstation series is an IA32-based workstation
352 based on SGI systems chips with some legacy PC hardware attached.
353
354 Say Y here to create a kernel to run on the SGI 320 or 540.
355
356 A kernel compiled for the Visual Workstation will run on general
357 PCs as well. See <file:Documentation/sgi-visws.txt> for details.
358
Ingo Molnar1f972762008-07-26 13:52:50 +0200359config X86_RDC321X
360 bool "RDC R-321x SoC"
361 depends on X86_32
362 select M486
363 select X86_REBOOTFIXUPS
364 help
365 This option is needed for RDC R-321x system-on-chip, also known
366 as R-8610-(G).
367 If you don't have one of these chips, you should say N here.
368
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100369config SCHED_NO_NO_OMIT_FRAME_POINTER
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100370 def_bool y
371 prompt "Single-depth WCHAN output"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100372 depends on X86_32
373 help
374 Calculate simpler /proc/<PID>/wchan values. If this option
375 is disabled then wchan values will recurse back to the
376 caller function. This provides more accurate wchan values,
377 at the expense of slightly more scheduling overhead.
378
379 If in doubt, say "Y".
380
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100381menuconfig PARAVIRT_GUEST
382 bool "Paravirtualized guest support"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100383 help
384 Say Y here to get to see options related to running Linux under
385 various hypervisors. This option alone does not add any kernel code.
386
387 If you say N, all options in this submenu will be skipped and disabled.
388
389if PARAVIRT_GUEST
390
391source "arch/x86/xen/Kconfig"
392
393config VMI
394 bool "VMI Guest support"
395 select PARAVIRT
Eduardo Pereira Habkost42d545c2008-01-30 13:33:32 +0100396 depends on X86_32
Ingo Molnarefefa6f2008-07-10 16:09:50 +0200397 depends on !X86_VOYAGER
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100398 help
399 VMI provides a paravirtualized interface to the VMware ESX server
400 (it could be used by other hypervisors in theory too, but is not
401 at the moment), by linking the kernel to a GPL-ed ROM module
402 provided by the hypervisor.
403
Glauber de Oliveira Costa790c73f2008-02-15 17:52:48 -0200404config KVM_CLOCK
405 bool "KVM paravirtualized clock"
406 select PARAVIRT
Gerd Hoffmannf6e16d52008-06-03 16:17:32 +0200407 select PARAVIRT_CLOCK
Ingo Molnarefefa6f2008-07-10 16:09:50 +0200408 depends on !X86_VOYAGER
Glauber de Oliveira Costa790c73f2008-02-15 17:52:48 -0200409 help
410 Turning on this option will allow you to run a paravirtualized clock
411 when running over the KVM hypervisor. Instead of relying on a PIT
412 (or probably other) emulation by the underlying device model, the host
413 provides the guest with timing infrastructure such as time of day, and
414 system time
415
Marcelo Tosatti0cf1bfd2008-02-22 12:21:36 -0500416config KVM_GUEST
417 bool "KVM Guest support"
418 select PARAVIRT
Ingo Molnarefefa6f2008-07-10 16:09:50 +0200419 depends on !X86_VOYAGER
Marcelo Tosatti0cf1bfd2008-02-22 12:21:36 -0500420 help
421 This option enables various optimizations for running under the KVM
422 hypervisor.
423
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100424source "arch/x86/lguest/Kconfig"
425
Eduardo Pereira Habkoste61bd942008-01-30 13:33:32 +0100426config PARAVIRT
427 bool "Enable paravirtualization code"
Ingo Molnarefefa6f2008-07-10 16:09:50 +0200428 depends on !X86_VOYAGER
Eduardo Pereira Habkoste61bd942008-01-30 13:33:32 +0100429 help
430 This changes the kernel so it can modify itself when it is run
431 under a hypervisor, potentially improving performance significantly
432 over full virtualization. However, when run without a hypervisor
433 the kernel is theoretically slower and slightly larger.
434
Gerd Hoffmann7af192c2008-06-03 16:17:29 +0200435config PARAVIRT_CLOCK
436 bool
437 default n
438
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100439endif
440
Jeremy Fitzhardinge97349132008-06-25 00:19:14 -0400441config PARAVIRT_DEBUG
442 bool "paravirt-ops debugging"
443 depends on PARAVIRT && DEBUG_KERNEL
444 help
445 Enable to debug paravirt_ops internals. Specifically, BUG if
446 a paravirt_op is missing when it is called.
447
Yinghai Lu03273182008-04-18 17:49:15 -0700448config MEMTEST
449 bool "Memtest"
Yinghai Luc64df702008-03-21 18:56:19 -0700450 help
451 This option adds a kernel parameter 'memtest', which allows memtest
Yinghai Lu03273182008-04-18 17:49:15 -0700452 to be set.
453 memtest=0, mean disabled; -- default
454 memtest=1, mean do 1 test pattern;
455 ...
456 memtest=4, mean do 4 test patterns.
Thomas Gleixneraba37282008-07-15 14:48:48 +0200457 If you are unsure how to answer this question, answer N.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100458
459config X86_SUMMIT_NUMA
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100460 def_bool y
Yinghai Lu0699eae2008-06-17 15:39:01 -0700461 depends on X86_32 && NUMA && X86_GENERICARCH
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100462
463config X86_CYCLONE_TIMER
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100464 def_bool y
Yinghai Lu0699eae2008-06-17 15:39:01 -0700465 depends on X86_GENERICARCH
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100466
467config ES7000_CLUSTERED_APIC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100468 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100469 depends on SMP && X86_ES7000 && MPENTIUMIII
470
471source "arch/x86/Kconfig.cpu"
472
473config HPET_TIMER
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100474 def_bool X86_64
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100475 prompt "HPET Timer Support" if X86_32
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100476 help
477 Use the IA-PC HPET (High Precision Event Timer) to manage
478 time in preference to the PIT and RTC, if a HPET is
479 present.
480 HPET is the next generation timer replacing legacy 8254s.
481 The HPET provides a stable time base on SMP
482 systems, unlike the TSC, but it is more expensive to access,
483 as it is off-chip. You can find the HPET spec at
484 <http://www.intel.com/hardwaredesign/hpetspec.htm>.
485
486 You can safely choose Y here. However, HPET will only be
487 activated if the platform and the BIOS support this feature.
488 Otherwise the 8254 will be used for timing services.
489
490 Choose N to continue using the legacy 8254 timer.
491
492config HPET_EMULATE_RTC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100493 def_bool y
Bernhard Walle9d8af782008-02-06 01:38:52 -0800494 depends on HPET_TIMER && (RTC=y || RTC=m || RTC_DRV_CMOS=m || RTC_DRV_CMOS=y)
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100495
496# Mark as embedded because too many people got it wrong.
497# The code disables itself when not needed.
Thomas Petazzoni7ae93922008-04-28 02:14:14 -0700498config DMI
499 default y
500 bool "Enable DMI scanning" if EMBEDDED
501 help
502 Enabled scanning of DMI to identify machine quirks. Say Y
503 here unless you have verified that your setup is not
504 affected by entries in the DMI blacklist. Required by PNP
505 BIOS code.
506
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100507config GART_IOMMU
508 bool "GART IOMMU support" if EMBEDDED
509 default y
510 select SWIOTLB
511 select AGP
512 depends on X86_64 && PCI
513 help
514 Support for full DMA access of devices with 32bit memory access only
515 on systems with more than 3GB. This is usually needed for USB,
516 sound, many IDE/SATA chipsets and some other devices.
517 Provides a driver for the AMD Athlon64/Opteron/Turion/Sempron GART
518 based hardware IOMMU and a software bounce buffer based IOMMU used
519 on Intel systems and as fallback.
520 The code is only active when needed (enough memory and limited
521 device) unless CONFIG_IOMMU_DEBUG or iommu=force is specified
522 too.
523
524config CALGARY_IOMMU
525 bool "IBM Calgary IOMMU support"
526 select SWIOTLB
527 depends on X86_64 && PCI && EXPERIMENTAL
528 help
529 Support for hardware IOMMUs in IBM's xSeries x366 and x460
530 systems. Needed to run systems with more than 3GB of memory
531 properly with 32-bit PCI devices that do not support DAC
532 (Double Address Cycle). Calgary also supports bus level
533 isolation, where all DMAs pass through the IOMMU. This
534 prevents them from going anywhere except their intended
535 destination. This catches hard-to-find kernel bugs and
536 mis-behaving drivers and devices that do not use the DMA-API
537 properly to set up their DMA buffers. The IOMMU can be
538 turned off at boot time with the iommu=off parameter.
539 Normally the kernel will make the right choice by itself.
540 If unsure, say Y.
541
542config CALGARY_IOMMU_ENABLED_BY_DEFAULT
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100543 def_bool y
544 prompt "Should Calgary be enabled by default?"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100545 depends on CALGARY_IOMMU
546 help
547 Should Calgary be enabled by default? if you choose 'y', Calgary
548 will be used (if it exists). If you choose 'n', Calgary will not be
549 used even if it exists. If you choose 'n' and would like to use
550 Calgary anyway, pass 'iommu=calgary' on the kernel command line.
551 If unsure, say Y.
552
Joerg Roedel2b188722008-06-26 21:27:37 +0200553config AMD_IOMMU
554 bool "AMD IOMMU support"
Ingo Molnar07c40e82008-06-27 11:31:28 +0200555 select SWIOTLB
Ingo Molnar24d2ba02008-06-27 10:37:03 +0200556 depends on X86_64 && PCI && ACPI
Joerg Roedel2b188722008-06-26 21:27:37 +0200557 help
Joerg Roedel18d22202008-07-03 19:35:06 +0200558 With this option you can enable support for AMD IOMMU hardware in
559 your system. An IOMMU is a hardware component which provides
560 remapping of DMA memory accesses from devices. With an AMD IOMMU you
561 can isolate the the DMA memory of different devices and protect the
562 system from misbehaving device drivers or hardware.
563
564 You can find out if your system has an AMD IOMMU if you look into
565 your BIOS for an option to enable it or if you have an IVRS ACPI
566 table.
Joerg Roedel2b188722008-06-26 21:27:37 +0200567
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100568# need this always selected by IOMMU for the VIA workaround
569config SWIOTLB
570 bool
571 help
572 Support for software bounce buffers used on x86-64 systems
573 which don't have a hardware IOMMU (e.g. the current generation
574 of Intel's x86-64 CPUs). Using this PCI devices which can only
575 access 32-bits of memory can be used on systems with more than
576 3 GB of memory. If unsure, say Y.
577
FUJITA Tomonoria8522502008-04-29 00:59:36 -0700578config IOMMU_HELPER
FUJITA Tomonori18b743d2008-07-10 09:50:50 +0900579 def_bool (CALGARY_IOMMU || GART_IOMMU || SWIOTLB || AMD_IOMMU)
Linus Torvaldsd25e26b2008-08-25 14:15:38 -0700580
Mike Travis1184dc22008-05-12 21:21:12 +0200581config MAXSMP
582 bool "Configure Maximum number of SMP Processors and NUMA Nodes"
Linus Torvaldsd25e26b2008-08-25 14:15:38 -0700583 depends on X86_64 && SMP && BROKEN
Mike Travis1184dc22008-05-12 21:21:12 +0200584 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
589config NR_CPUS
Linus Torvaldsd25e26b2008-08-25 14:15:38 -0700590 int "Maximum number of CPUs (2-512)" if !MAXSMP
591 range 2 512
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100592 depends on SMP
Linus Torvaldsd25e26b2008-08-25 14:15:38 -0700593 default "4096" if MAXSMP
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100594 default "32" if X86_NUMAQ || X86_SUMMIT || X86_BIGSMP || X86_ES7000
595 default "8"
596 help
597 This allows you to specify the maximum number of CPUs which this
Linus Torvaldsd25e26b2008-08-25 14:15:38 -0700598 kernel will support. The maximum supported value is 512 and the
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100599 minimum value which makes sense is 2.
600
601 This is purely to save memory - each supported CPU adds
602 approximately eight kilobytes to the kernel image.
603
604config SCHED_SMT
605 bool "SMT (Hyperthreading) scheduler support"
Hiroshi Shimamotob089c122008-02-27 13:16:30 -0800606 depends on X86_HT
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100607 help
608 SMT scheduler support improves the CPU scheduler's decision making
609 when dealing with Intel Pentium 4 chips with HyperThreading at a
610 cost of slightly increased overhead in some places. If unsure say
611 N here.
612
613config SCHED_MC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100614 def_bool y
615 prompt "Multi-core scheduler support"
Hiroshi Shimamotob089c122008-02-27 13:16:30 -0800616 depends on X86_HT
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100617 help
618 Multi-core scheduler support improves the CPU scheduler's decision
619 making when dealing with multi-core CPU chips at a cost of slightly
620 increased overhead in some places. If unsure say N here.
621
622source "kernel/Kconfig.preempt"
623
624config X86_UP_APIC
625 bool "Local APIC support on uniprocessors"
Ingo Molnarefefa6f2008-07-10 16:09:50 +0200626 depends on X86_32 && !SMP && !(X86_VOYAGER || X86_GENERICARCH)
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100627 help
628 A local APIC (Advanced Programmable Interrupt Controller) is an
629 integrated interrupt controller in the CPU. If you have a single-CPU
630 system which has a processor with a local APIC, you can say Y here to
631 enable and use it. If you say Y here even though your machine doesn't
632 have a local APIC, then the kernel will still run with no slowdown at
633 all. The local APIC supports CPU-generated self-interrupts (timer,
634 performance counters), and the NMI watchdog which detects hard
635 lockups.
636
637config X86_UP_IOAPIC
638 bool "IO-APIC support on uniprocessors"
639 depends on X86_UP_APIC
640 help
641 An IO-APIC (I/O Advanced Programmable Interrupt Controller) is an
642 SMP-capable replacement for PC-style interrupt controllers. Most
643 SMP systems and many recent uniprocessor systems have one.
644
645 If you have a single-CPU system with an IO-APIC, you can say Y here
646 to use it. If you say Y here even though your machine doesn't have
647 an IO-APIC, then the kernel will still run with no slowdown at all.
648
649config X86_LOCAL_APIC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100650 def_bool y
Ingo Molnarefefa6f2008-07-10 16:09:50 +0200651 depends on X86_64 || (X86_32 && (X86_UP_APIC || (SMP && !X86_VOYAGER) || X86_GENERICARCH))
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100652
653config X86_IO_APIC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100654 def_bool y
Ingo Molnarefefa6f2008-07-10 16:09:50 +0200655 depends on X86_64 || (X86_32 && (X86_UP_IOAPIC || (SMP && !X86_VOYAGER) || X86_GENERICARCH))
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100656
657config X86_VISWS_APIC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100658 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100659 depends on X86_32 && X86_VISWS
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100660
661config X86_MCE
662 bool "Machine Check Exception"
663 depends on !X86_VOYAGER
664 ---help---
665 Machine Check Exception support allows the processor to notify the
666 kernel if it detects a problem (e.g. overheating, component failure).
667 The action the kernel takes depends on the severity of the problem,
668 ranging from a warning message on the console, to halting the machine.
669 Your processor must be a Pentium or newer to support this - check the
670 flags in /proc/cpuinfo for mce. Note that some older Pentium systems
671 have a design flaw which leads to false MCE events - hence MCE is
672 disabled on all P5 processors, unless explicitly enabled with "mce"
673 as a boot argument. Similarly, if MCE is built in and creates a
674 problem on some new non-standard machine, you can boot with "nomce"
675 to disable it. MCE support simply ignores non-MCE processors like
676 the 386 and 486, so nearly everyone can say Y here.
677
678config X86_MCE_INTEL
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100679 def_bool y
680 prompt "Intel MCE features"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100681 depends on X86_64 && X86_MCE && X86_LOCAL_APIC
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100682 help
683 Additional support for intel specific MCE features such as
684 the thermal monitor.
685
686config X86_MCE_AMD
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100687 def_bool y
688 prompt "AMD MCE features"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100689 depends on X86_64 && X86_MCE && X86_LOCAL_APIC
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100690 help
691 Additional support for AMD specific MCE features such as
692 the DRAM Error Threshold.
693
694config X86_MCE_NONFATAL
695 tristate "Check for non-fatal errors on AMD Athlon/Duron / Intel Pentium 4"
696 depends on X86_32 && X86_MCE
697 help
698 Enabling this feature starts a timer that triggers every 5 seconds which
699 will look at the machine check registers to see if anything happened.
700 Non-fatal problems automatically get corrected (but still logged).
701 Disable this if you don't want to see these messages.
702 Seeing the messages this option prints out may be indicative of dying
703 or out-of-spec (ie, overclocked) hardware.
704 This option only does something on certain CPUs.
705 (AMD Athlon/Duron and Intel Pentium 4)
706
707config X86_MCE_P4THERMAL
708 bool "check for P4 thermal throttling interrupt."
Ingo Molnarefefa6f2008-07-10 16:09:50 +0200709 depends on X86_32 && X86_MCE && (X86_UP_APIC || SMP)
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100710 help
711 Enabling this feature will cause a message to be printed when the P4
712 enters thermal throttling.
713
714config VM86
715 bool "Enable VM86 support" if EMBEDDED
716 default y
717 depends on X86_32
718 help
719 This option is required by programs like DOSEMU to run 16-bit legacy
720 code on X86 processors. It also may be needed by software like
721 XFree86 to initialize some video cards via BIOS. Disabling this
722 option saves about 6k.
723
724config TOSHIBA
725 tristate "Toshiba Laptop support"
726 depends on X86_32
727 ---help---
728 This adds a driver to safely access the System Management Mode of
729 the CPU on Toshiba portables with a genuine Toshiba BIOS. It does
730 not work on models with a Phoenix BIOS. The System Management Mode
731 is used to set the BIOS and power saving options on Toshiba portables.
732
733 For information on utilities to make use of this driver see the
734 Toshiba Linux utilities web site at:
735 <http://www.buzzard.org.uk/toshiba/>.
736
737 Say Y if you intend to run this kernel on a Toshiba portable.
738 Say N otherwise.
739
740config I8K
741 tristate "Dell laptop support"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100742 ---help---
743 This adds a driver to safely access the System Management Mode
744 of the CPU on the Dell Inspiron 8000. The System Management Mode
745 is used to read cpu temperature and cooling fan status and to
746 control the fans on the I8K portables.
747
748 This driver has been tested only on the Inspiron 8000 but it may
749 also work with other Dell laptops. You can force loading on other
750 models by passing the parameter `force=1' to the module. Use at
751 your own risk.
752
753 For information on utilities to make use of this driver see the
754 I8K Linux utilities web site at:
755 <http://people.debian.org/~dz/i8k/>
756
757 Say Y if you intend to run this kernel on a Dell Inspiron 8000.
758 Say N otherwise.
759
760config X86_REBOOTFIXUPS
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100761 def_bool n
762 prompt "Enable X86 board specific fixups for reboot"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100763 depends on X86_32 && X86
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100764 ---help---
765 This enables chipset and/or board specific fixups to be done
766 in order to get reboot to work correctly. This is only needed on
767 some combinations of hardware and BIOS. The symptom, for which
768 this config is intended, is when reboot ends with a stalled/hung
769 system.
770
771 Currently, the only fixup is for the Geode machines using
Florian Fainelli5e3a77e2008-01-30 13:33:36 +0100772 CS5530A and CS5536 chipsets and the RDC R-321x SoC.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100773
774 Say Y if you want to enable the fixup. Currently, it's safe to
775 enable this option even if you don't need it.
776 Say N otherwise.
777
778config MICROCODE
779 tristate "/dev/cpu/microcode - Intel IA32 CPU microcode support"
780 select FW_LOADER
781 ---help---
782 If you say Y here, you will be able to update the microcode on
783 Intel processors in the IA32 family, e.g. Pentium Pro, Pentium II,
784 Pentium III, Pentium 4, Xeon etc. You will obviously need the
785 actual microcode binary data itself which is not shipped with the
786 Linux kernel.
787
788 For latest news and information on obtaining all the required
789 ingredients for this driver, check:
790 <http://www.urbanmyth.org/microcode/>.
791
792 To compile this driver as a module, choose M here: the
793 module will be called microcode.
794
795config MICROCODE_OLD_INTERFACE
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100796 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100797 depends on MICROCODE
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100798
799config X86_MSR
800 tristate "/dev/cpu/*/msr - Model-specific register support"
801 help
802 This device gives privileged processes access to the x86
803 Model-Specific Registers (MSRs). It is a character device with
804 major 202 and minors 0 to 31 for /dev/cpu/0/msr to /dev/cpu/31/msr.
805 MSR accesses are directed to a specific CPU on multi-processor
806 systems.
807
808config X86_CPUID
809 tristate "/dev/cpu/*/cpuid - CPU information support"
810 help
811 This device gives processes access to the x86 CPUID instruction to
812 be executed on a specific processor. It is a character device
813 with major 203 and minors 0 to 31 for /dev/cpu/0/cpuid to
814 /dev/cpu/31/cpuid.
815
816choice
817 prompt "High Memory Support"
818 default HIGHMEM4G if !X86_NUMAQ
819 default HIGHMEM64G if X86_NUMAQ
820 depends on X86_32
821
822config NOHIGHMEM
823 bool "off"
824 depends on !X86_NUMAQ
825 ---help---
826 Linux can use up to 64 Gigabytes of physical memory on x86 systems.
827 However, the address space of 32-bit x86 processors is only 4
828 Gigabytes large. That means that, if you have a large amount of
829 physical memory, not all of it can be "permanently mapped" by the
830 kernel. The physical memory that's not permanently mapped is called
831 "high memory".
832
833 If you are compiling a kernel which will never run on a machine with
834 more than 1 Gigabyte total physical RAM, answer "off" here (default
835 choice and suitable for most users). This will result in a "3GB/1GB"
836 split: 3GB are mapped so that each process sees a 3GB virtual memory
837 space and the remaining part of the 4GB virtual memory space is used
838 by the kernel to permanently map as much physical memory as
839 possible.
840
841 If the machine has between 1 and 4 Gigabytes physical RAM, then
842 answer "4GB" here.
843
844 If more than 4 Gigabytes is used then answer "64GB" here. This
845 selection turns Intel PAE (Physical Address Extension) mode on.
846 PAE implements 3-level paging on IA32 processors. PAE is fully
847 supported by Linux, PAE mode is implemented on all recent Intel
848 processors (Pentium Pro and better). NOTE: If you say "64GB" here,
849 then the kernel will not boot on CPUs that don't support PAE!
850
851 The actual amount of total physical memory will either be
852 auto detected or can be forced by using a kernel command line option
853 such as "mem=256M". (Try "man bootparam" or see the documentation of
854 your boot loader (lilo or loadlin) about how to pass options to the
855 kernel at boot time.)
856
857 If unsure, say "off".
858
859config HIGHMEM4G
860 bool "4GB"
861 depends on !X86_NUMAQ
862 help
863 Select this if you have a 32-bit processor and between 1 and 4
864 gigabytes of physical RAM.
865
866config HIGHMEM64G
867 bool "64GB"
868 depends on !M386 && !M486
869 select X86_PAE
870 help
871 Select this if you have a 32-bit processor and more than 4
872 gigabytes of physical RAM.
873
874endchoice
875
876choice
877 depends on EXPERIMENTAL
878 prompt "Memory split" if EMBEDDED
879 default VMSPLIT_3G
880 depends on X86_32
881 help
882 Select the desired split between kernel and user memory.
883
884 If the address range available to the kernel is less than the
885 physical memory installed, the remaining memory will be available
886 as "high memory". Accessing high memory is a little more costly
887 than low memory, as it needs to be mapped into the kernel first.
888 Note that increasing the kernel address space limits the range
889 available to user programs, making the address space there
890 tighter. Selecting anything other than the default 3G/1G split
891 will also likely make your kernel incompatible with binary-only
892 kernel modules.
893
894 If you are not absolutely sure what you are doing, leave this
895 option alone!
896
897 config VMSPLIT_3G
898 bool "3G/1G user/kernel split"
899 config VMSPLIT_3G_OPT
900 depends on !X86_PAE
901 bool "3G/1G user/kernel split (for full 1G low memory)"
902 config VMSPLIT_2G
903 bool "2G/2G user/kernel split"
904 config VMSPLIT_2G_OPT
905 depends on !X86_PAE
906 bool "2G/2G user/kernel split (for full 2G low memory)"
907 config VMSPLIT_1G
908 bool "1G/3G user/kernel split"
909endchoice
910
911config PAGE_OFFSET
912 hex
913 default 0xB0000000 if VMSPLIT_3G_OPT
914 default 0x80000000 if VMSPLIT_2G
915 default 0x78000000 if VMSPLIT_2G_OPT
916 default 0x40000000 if VMSPLIT_1G
917 default 0xC0000000
918 depends on X86_32
919
920config HIGHMEM
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100921 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100922 depends on X86_32 && (HIGHMEM64G || HIGHMEM4G)
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100923
924config X86_PAE
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100925 def_bool n
926 prompt "PAE (Physical Address Extension) Support"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100927 depends on X86_32 && !HIGHMEM4G
928 select RESOURCES_64BIT
929 help
930 PAE is required for NX support, and furthermore enables
931 larger swapspace support for non-overcommit purposes. It
932 has the cost of more pagetable lookup overhead, and also
933 consumes more pagetable space per process.
934
935# Common NUMA Features
936config NUMA
937 bool "Numa Memory Allocation and Scheduler Support (EXPERIMENTAL)"
938 depends on SMP
Yinghai Lu0699eae2008-06-17 15:39:01 -0700939 depends on X86_64 || (X86_32 && HIGHMEM64G && (X86_NUMAQ || X86_BIGSMP || X86_SUMMIT && ACPI) && EXPERIMENTAL)
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100940 default n if X86_PC
Yinghai Lu0699eae2008-06-17 15:39:01 -0700941 default y if (X86_NUMAQ || X86_SUMMIT || X86_BIGSMP)
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100942 help
943 Enable NUMA (Non Uniform Memory Access) support.
944 The kernel will try to allocate memory used by a CPU on the
945 local memory controller of the CPU and add some more
946 NUMA awareness to the kernel.
947
Pavel Machek04b69442008-08-14 17:16:50 +0200948 For 32-bit this is currently highly experimental and should be only
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100949 used for kernel development. It might also cause boot failures.
Pavel Machek04b69442008-08-14 17:16:50 +0200950 For 64-bit this is recommended on all multiprocessor Opteron systems.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100951 If the system is EM64T, you should say N unless your system is
952 EM64T NUMA.
953
954comment "NUMA (Summit) requires SMP, 64GB highmem support, ACPI"
955 depends on X86_32 && X86_SUMMIT && (!HIGHMEM64G || !ACPI)
956
957config K8_NUMA
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100958 def_bool y
959 prompt "Old style AMD Opteron NUMA detection"
960 depends on X86_64 && NUMA && PCI
961 help
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100962 Enable K8 NUMA node topology detection. You should say Y here if
963 you have a multi processor AMD K8 system. This uses an old
964 method to read the NUMA configuration directly from the builtin
965 Northbridge of Opteron. It is recommended to use X86_64_ACPI_NUMA
966 instead, which also takes priority if both are compiled in.
967
968config X86_64_ACPI_NUMA
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100969 def_bool y
970 prompt "ACPI NUMA detection"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100971 depends on X86_64 && NUMA && ACPI && PCI
972 select ACPI_NUMA
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100973 help
974 Enable ACPI SRAT based node topology detection.
975
Suresh Siddha6ec6e0d2008-03-25 10:14:35 -0700976# Some NUMA nodes have memory ranges that span
977# other nodes. Even though a pfn is valid and
978# between a node's start and end pfns, it may not
979# reside on that node. See memmap_init_zone()
980# for details.
981config NODES_SPAN_OTHER_NODES
982 def_bool y
983 depends on X86_64_ACPI_NUMA
984
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100985config NUMA_EMU
986 bool "NUMA emulation"
987 depends on X86_64 && NUMA
988 help
989 Enable NUMA emulation. A flat machine will be split
990 into virtual nodes when booted with "numa=fake=N", where N is the
991 number of nodes. This is only useful for debugging.
992
993config NODES_SHIFT
Linus Torvaldsd25e26b2008-08-25 14:15:38 -0700994 int "Maximum NUMA Nodes (as a power of 2)" if !MAXSMP
Mike Travis1184dc22008-05-12 21:21:12 +0200995 range 1 9 if X86_64
Linus Torvaldsd25e26b2008-08-25 14:15:38 -0700996 default "9" if MAXSMP
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100997 default "6" if X86_64
998 default "4" if X86_NUMAQ
999 default "3"
1000 depends on NEED_MULTIPLE_NODES
Mike Travis1184dc22008-05-12 21:21:12 +02001001 help
1002 Specify the maximum number of NUMA Nodes available on the target
1003 system. Increases memory reserved to accomodate various tables.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001004
1005config HAVE_ARCH_BOOTMEM_NODE
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001006 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001007 depends on X86_32 && NUMA
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001008
1009config ARCH_HAVE_MEMORY_PRESENT
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001010 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001011 depends on X86_32 && DISCONTIGMEM
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001012
1013config NEED_NODE_MEMMAP_SIZE
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001014 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001015 depends on X86_32 && (DISCONTIGMEM || SPARSEMEM)
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001016
1017config HAVE_ARCH_ALLOC_REMAP
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001018 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001019 depends on X86_32 && NUMA
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001020
1021config ARCH_FLATMEM_ENABLE
1022 def_bool y
Mel Gorman409a7b82008-01-30 13:33:25 +01001023 depends on X86_32 && ARCH_SELECT_MEMORY_MODEL && X86_PC && !NUMA
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001024
1025config ARCH_DISCONTIGMEM_ENABLE
1026 def_bool y
Christoph Lameterb2632952008-01-30 13:30:47 +01001027 depends on NUMA && X86_32
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001028
1029config ARCH_DISCONTIGMEM_DEFAULT
1030 def_bool y
Christoph Lameterb2632952008-01-30 13:30:47 +01001031 depends on NUMA && X86_32
1032
1033config ARCH_SPARSEMEM_DEFAULT
1034 def_bool y
1035 depends on X86_64
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001036
1037config ARCH_SPARSEMEM_ENABLE
1038 def_bool y
Christoph Lameterb2632952008-01-30 13:30:47 +01001039 depends on X86_64 || NUMA || (EXPERIMENTAL && X86_PC)
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001040 select SPARSEMEM_STATIC if X86_32
1041 select SPARSEMEM_VMEMMAP_ENABLE if X86_64
1042
1043config ARCH_SELECT_MEMORY_MODEL
1044 def_bool y
Christoph Lameterb2632952008-01-30 13:30:47 +01001045 depends on ARCH_SPARSEMEM_ENABLE
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001046
1047config ARCH_MEMORY_PROBE
1048 def_bool X86_64
1049 depends on MEMORY_HOTPLUG
1050
1051source "mm/Kconfig"
1052
1053config HIGHPTE
1054 bool "Allocate 3rd-level pagetables from highmem"
1055 depends on X86_32 && (HIGHMEM4G || HIGHMEM64G)
1056 help
1057 The VM uses one page table entry for each page of physical memory.
1058 For systems with a lot of RAM, this can be wasteful of precious
1059 low memory. Setting this option will put user-space page table
1060 entries in high memory.
1061
1062config MATH_EMULATION
1063 bool
1064 prompt "Math emulation" if X86_32
1065 ---help---
1066 Linux can emulate a math coprocessor (used for floating point
1067 operations) if you don't have one. 486DX and Pentium processors have
1068 a math coprocessor built in, 486SX and 386 do not, unless you added
1069 a 487DX or 387, respectively. (The messages during boot time can
1070 give you some hints here ["man dmesg"].) Everyone needs either a
1071 coprocessor or this emulation.
1072
1073 If you don't have a math coprocessor, you need to say Y here; if you
1074 say Y here even though you have a coprocessor, the coprocessor will
1075 be used nevertheless. (This behavior can be changed with the kernel
1076 command line option "no387", which comes handy if your coprocessor
1077 is broken. Try "man bootparam" or see the documentation of your boot
1078 loader (lilo or loadlin) about how to pass options to the kernel at
1079 boot time.) This means that it is a good idea to say Y here if you
1080 intend to use this kernel on different machines.
1081
1082 More information about the internals of the Linux math coprocessor
1083 emulation can be found in <file:arch/x86/math-emu/README>.
1084
1085 If you are not sure, say Y; apart from resulting in a 66 KB bigger
1086 kernel, it won't hurt.
1087
1088config MTRR
1089 bool "MTRR (Memory Type Range Register) support"
1090 ---help---
1091 On Intel P6 family processors (Pentium Pro, Pentium II and later)
1092 the Memory Type Range Registers (MTRRs) may be used to control
1093 processor access to memory ranges. This is most useful if you have
1094 a video (VGA) card on a PCI or AGP bus. Enabling write-combining
1095 allows bus write transfers to be combined into a larger transfer
1096 before bursting over the PCI/AGP bus. This can increase performance
1097 of image write operations 2.5 times or more. Saying Y here creates a
1098 /proc/mtrr file which may be used to manipulate your processor's
1099 MTRRs. Typically the X server should use this.
1100
1101 This code has a reasonably generic interface so that similar
1102 control registers on other processors can be easily supported
1103 as well:
1104
1105 The Cyrix 6x86, 6x86MX and M II processors have Address Range
1106 Registers (ARRs) which provide a similar functionality to MTRRs. For
1107 these, the ARRs are used to emulate the MTRRs.
1108 The AMD K6-2 (stepping 8 and above) and K6-3 processors have two
1109 MTRRs. The Centaur C6 (WinChip) has 8 MCRs, allowing
1110 write-combining. All of these processors are supported by this code
1111 and it makes sense to say Y here if you have one of them.
1112
1113 Saying Y here also fixes a problem with buggy SMP BIOSes which only
1114 set the MTRRs for the boot CPU and not for the secondary CPUs. This
1115 can lead to all sorts of problems, so it's good to say Y here.
1116
1117 You can safely say Y even if your machine doesn't have MTRRs, you'll
1118 just add about 9 KB to your kernel.
1119
1120 See <file:Documentation/mtrr.txt> for more information.
1121
Yinghai Lu95ffa242008-04-29 03:52:33 -07001122config MTRR_SANITIZER
Thomas Gleixneraba37282008-07-15 14:48:48 +02001123 bool
Yinghai Lu95ffa242008-04-29 03:52:33 -07001124 prompt "MTRR cleanup support"
1125 depends on MTRR
1126 help
Thomas Gleixneraba37282008-07-15 14:48:48 +02001127 Convert MTRR layout from continuous to discrete, so X drivers can
1128 add writeback entries.
Yinghai Lu95ffa242008-04-29 03:52:33 -07001129
Thomas Gleixneraba37282008-07-15 14:48:48 +02001130 Can be disabled with disable_mtrr_cleanup on the kernel command line.
1131 The largest mtrr entry size for a continous block can be set with
1132 mtrr_chunk_size.
Yinghai Lu95ffa242008-04-29 03:52:33 -07001133
Thomas Gleixneraba37282008-07-15 14:48:48 +02001134 If unsure, say N.
Yinghai Lu95ffa242008-04-29 03:52:33 -07001135
1136config MTRR_SANITIZER_ENABLE_DEFAULT
Yinghai Luf5098d62008-04-29 20:25:58 -07001137 int "MTRR cleanup enable value (0-1)"
1138 range 0 1
1139 default "0"
Yinghai Lu95ffa242008-04-29 03:52:33 -07001140 depends on MTRR_SANITIZER
1141 help
Yinghai Luf5098d62008-04-29 20:25:58 -07001142 Enable mtrr cleanup default value
Yinghai Lu95ffa242008-04-29 03:52:33 -07001143
Yinghai Lu12031a62008-05-02 02:40:22 -07001144config MTRR_SANITIZER_SPARE_REG_NR_DEFAULT
1145 int "MTRR cleanup spare reg num (0-7)"
1146 range 0 7
1147 default "1"
1148 depends on MTRR_SANITIZER
1149 help
1150 mtrr cleanup spare entries default, it can be changed via
Thomas Gleixneraba37282008-07-15 14:48:48 +02001151 mtrr_spare_reg_nr=N on the kernel command line.
Yinghai Lu12031a62008-05-02 02:40:22 -07001152
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001153config X86_PAT
Ingo Molnar2a8a2712008-04-26 10:26:52 +02001154 bool
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001155 prompt "x86 PAT support"
Ingo Molnar2a8a2712008-04-26 10:26:52 +02001156 depends on MTRR
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001157 help
1158 Use PAT attributes to setup page level cache control.
Venki Pallipadi042b78e2008-03-24 14:22:35 -07001159
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001160 PATs are the modern equivalents of MTRRs and are much more
1161 flexible than MTRRs.
1162
1163 Say N here if you see bootup problems (boot crash, boot hang,
Venki Pallipadi042b78e2008-03-24 14:22:35 -07001164 spontaneous reboots) or a non-working video driver.
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001165
1166 If unsure, say Y.
1167
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001168config EFI
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001169 def_bool n
Huang, Ying8b2cb7a2008-01-30 13:32:11 +01001170 prompt "EFI runtime service support"
Huang, Ying5b836832008-01-30 13:31:19 +01001171 depends on ACPI
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001172 ---help---
Huang, Ying8b2cb7a2008-01-30 13:32:11 +01001173 This enables the kernel to use EFI runtime services that are
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001174 available (such as the EFI variable services).
1175
Huang, Ying8b2cb7a2008-01-30 13:32:11 +01001176 This option is only useful on systems that have EFI firmware.
1177 In addition, you should use the latest ELILO loader available
1178 at <http://elilo.sourceforge.net> in order to take advantage
1179 of EFI runtime services. However, even with this option, the
1180 resultant kernel should continue to boot on existing non-EFI
1181 platforms.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001182
1183config IRQBALANCE
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001184 def_bool y
1185 prompt "Enable kernel irq balancing"
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001186 depends on X86_32 && SMP && X86_IO_APIC
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001187 help
1188 The default yes will allow the kernel to do irq load balancing.
1189 Saying no will keep the kernel from doing irq load balancing.
1190
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001191config SECCOMP
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001192 def_bool y
1193 prompt "Enable seccomp to safely compute untrusted bytecode"
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001194 depends on PROC_FS
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001195 help
1196 This kernel feature is useful for number crunching applications
1197 that may need to compute untrusted bytecode during their
1198 execution. By using pipes or other transports made available to
1199 the process as file descriptors supporting the read/write
1200 syscalls, it's possible to isolate those applications in
1201 their own address space using seccomp. Once seccomp is
1202 enabled via /proc/<pid>/seccomp, it cannot be disabled
1203 and the task is only allowed to execute a few safe syscalls
1204 defined by each seccomp mode.
1205
1206 If unsure, say Y. Only embedded should say N here.
1207
1208config CC_STACKPROTECTOR
1209 bool "Enable -fstack-protector buffer overflow detection (EXPERIMENTAL)"
Linus Torvalds2c020a92008-02-22 08:21:38 -08001210 depends on X86_64 && EXPERIMENTAL && BROKEN
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001211 help
1212 This option turns on the -fstack-protector GCC feature. This
1213 feature puts, at the beginning of critical functions, a canary
1214 value on the stack just before the return address, and validates
1215 the value just before actually returning. Stack based buffer
1216 overflows (that need to overwrite this return address) now also
1217 overwrite the canary, which gets detected and the attack is then
1218 neutralized via a kernel panic.
1219
1220 This feature requires gcc version 4.2 or above, or a distribution
1221 gcc with the feature backported. Older versions are automatically
1222 detected and for those versions, this configuration option is ignored.
1223
1224config CC_STACKPROTECTOR_ALL
1225 bool "Use stack-protector for all functions"
1226 depends on CC_STACKPROTECTOR
1227 help
1228 Normally, GCC only inserts the canary value protection for
1229 functions that use large-ish on-stack buffers. By enabling
1230 this option, GCC will be asked to do this for ALL functions.
1231
1232source kernel/Kconfig.hz
1233
1234config KEXEC
1235 bool "kexec system call"
Ingo Molnar3e8f7e32008-04-28 10:46:58 +02001236 depends on X86_BIOS_REBOOT
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001237 help
1238 kexec is a system call that implements the ability to shutdown your
1239 current kernel, and to start another kernel. It is like a reboot
1240 but it is independent of the system firmware. And like a reboot
1241 you can start any kernel with it, not just Linux.
1242
1243 The name comes from the similarity to the exec system call.
1244
1245 It is an ongoing process to be certain the hardware in a machine
1246 is properly shutdown, so do not be surprised if this code does not
1247 initially work for you. It may help to enable device hotplugging
1248 support. As of this writing the exact hardware interface is
1249 strongly in flux, so no good recommendation can be made.
1250
1251config CRASH_DUMP
Pavel Machek04b69442008-08-14 17:16:50 +02001252 bool "kernel crash dumps"
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001253 depends on X86_64 || (X86_32 && HIGHMEM)
1254 help
1255 Generate crash dump after being started by kexec.
1256 This should be normally only set in special crash dump kernels
1257 which are loaded in the main kernel with kexec-tools into
1258 a specially reserved region and then later executed after
1259 a crash by kdump/kexec. The crash dump kernel must be compiled
1260 to a memory address not used by the main kernel or BIOS using
1261 PHYSICAL_START, or it must be built as a relocatable image
1262 (CONFIG_RELOCATABLE=y).
1263 For more details see Documentation/kdump/kdump.txt
1264
Huang Ying3ab83522008-07-25 19:45:07 -07001265config KEXEC_JUMP
1266 bool "kexec jump (EXPERIMENTAL)"
1267 depends on EXPERIMENTAL
Huang Ying89081d12008-07-25 19:45:10 -07001268 depends on KEXEC && HIBERNATION && X86_32
Huang Ying3ab83522008-07-25 19:45:07 -07001269 help
Huang Ying89081d12008-07-25 19:45:10 -07001270 Jump between original kernel and kexeced kernel and invoke
1271 code in physical address mode via KEXEC
Huang Ying3ab83522008-07-25 19:45:07 -07001272
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001273config PHYSICAL_START
1274 hex "Physical address where the kernel is loaded" if (EMBEDDED || CRASH_DUMP)
1275 default "0x1000000" if X86_NUMAQ
1276 default "0x200000" if X86_64
1277 default "0x100000"
1278 help
1279 This gives the physical address where the kernel is loaded.
1280
1281 If kernel is a not relocatable (CONFIG_RELOCATABLE=n) then
1282 bzImage will decompress itself to above physical address and
1283 run from there. Otherwise, bzImage will run from the address where
1284 it has been loaded by the boot loader and will ignore above physical
1285 address.
1286
1287 In normal kdump cases one does not have to set/change this option
1288 as now bzImage can be compiled as a completely relocatable image
1289 (CONFIG_RELOCATABLE=y) and be used to load and run from a different
1290 address. This option is mainly useful for the folks who don't want
1291 to use a bzImage for capturing the crash dump and want to use a
1292 vmlinux instead. vmlinux is not relocatable hence a kernel needs
1293 to be specifically compiled to run from a specific memory area
1294 (normally a reserved region) and this option comes handy.
1295
1296 So if you are using bzImage for capturing the crash dump, leave
1297 the value here unchanged to 0x100000 and set CONFIG_RELOCATABLE=y.
1298 Otherwise if you plan to use vmlinux for capturing the crash dump
1299 change this value to start of the reserved region (Typically 16MB
1300 0x1000000). In other words, it can be set based on the "X" value as
1301 specified in the "crashkernel=YM@XM" command line boot parameter
1302 passed to the panic-ed kernel. Typically this parameter is set as
1303 crashkernel=64M@16M. Please take a look at
1304 Documentation/kdump/kdump.txt for more details about crash dumps.
1305
1306 Usage of bzImage for capturing the crash dump is recommended as
1307 one does not have to build two kernels. Same kernel can be used
1308 as production kernel and capture kernel. Above option should have
1309 gone away after relocatable bzImage support is introduced. But it
1310 is present because there are users out there who continue to use
1311 vmlinux for dump capture. This option should go away down the
1312 line.
1313
1314 Don't change this unless you know what you are doing.
1315
1316config RELOCATABLE
1317 bool "Build a relocatable kernel (EXPERIMENTAL)"
1318 depends on EXPERIMENTAL
1319 help
1320 This builds a kernel image that retains relocation information
1321 so it can be loaded someplace besides the default 1MB.
1322 The relocations tend to make the kernel binary about 10% larger,
1323 but are discarded at runtime.
1324
1325 One use is for the kexec on panic case where the recovery kernel
1326 must live at a different physical address than the primary
1327 kernel.
1328
1329 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
1330 it has been loaded at and the compile time physical address
1331 (CONFIG_PHYSICAL_START) is ignored.
1332
1333config PHYSICAL_ALIGN
1334 hex
1335 prompt "Alignment value to which kernel should be aligned" if X86_32
1336 default "0x100000" if X86_32
1337 default "0x200000" if X86_64
1338 range 0x2000 0x400000
1339 help
1340 This value puts the alignment restrictions on physical address
1341 where kernel is loaded and run from. Kernel is compiled for an
1342 address which meets above alignment restriction.
1343
1344 If bootloader loads the kernel at a non-aligned address and
1345 CONFIG_RELOCATABLE is set, kernel will move itself to nearest
1346 address aligned to above value and run from there.
1347
1348 If bootloader loads the kernel at a non-aligned address and
1349 CONFIG_RELOCATABLE is not set, kernel will ignore the run time
1350 load address and decompress itself to the address it has been
1351 compiled for and run from there. The address for which kernel is
1352 compiled already meets above alignment restrictions. Hence the
1353 end result is that kernel runs from a physical address meeting
1354 above alignment restrictions.
1355
1356 Don't change this unless you know what you are doing.
1357
1358config HOTPLUG_CPU
1359 bool "Support for suspend on SMP and hot-pluggable CPUs (EXPERIMENTAL)"
1360 depends on SMP && HOTPLUG && EXPERIMENTAL && !X86_VOYAGER
1361 ---help---
1362 Say Y here to experiment with turning CPUs off and on, and to
1363 enable suspend on SMP systems. CPUs can be controlled through
1364 /sys/devices/system/cpu.
1365 Say N if you want to disable CPU hotplug and don't need to
1366 suspend.
1367
1368config COMPAT_VDSO
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001369 def_bool y
1370 prompt "Compat VDSO support"
Roland McGrathaf65d642008-01-30 13:30:43 +01001371 depends on X86_32 || IA32_EMULATION
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001372 help
Roland McGrathaf65d642008-01-30 13:30:43 +01001373 Map the 32-bit VDSO to the predictable old-style address too.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001374 ---help---
1375 Say N here if you are running a sufficiently recent glibc
1376 version (2.3.3 or later), to remove the high-mapped
1377 VDSO mapping and to exclusively use the randomized VDSO.
1378
1379 If unsure, say Y.
1380
1381endmenu
1382
1383config ARCH_ENABLE_MEMORY_HOTPLUG
1384 def_bool y
1385 depends on X86_64 || (X86_32 && HIGHMEM)
1386
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001387config HAVE_ARCH_EARLY_PFN_TO_NID
1388 def_bool X86_64
1389 depends on NUMA
1390
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001391menu "Power management options"
1392 depends on !X86_VOYAGER
1393
1394config ARCH_HIBERNATION_HEADER
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001395 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001396 depends on X86_64 && HIBERNATION
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001397
1398source "kernel/power/Kconfig"
1399
1400source "drivers/acpi/Kconfig"
1401
Andi Kleena6b68072008-01-30 13:32:49 +01001402config X86_APM_BOOT
1403 bool
1404 default y
1405 depends on APM || APM_MODULE
1406
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001407menuconfig APM
1408 tristate "APM (Advanced Power Management) BIOS support"
Ingo Molnarefefa6f2008-07-10 16:09:50 +02001409 depends on X86_32 && PM_SLEEP
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001410 ---help---
1411 APM is a BIOS specification for saving power using several different
1412 techniques. This is mostly useful for battery powered laptops with
1413 APM compliant BIOSes. If you say Y here, the system time will be
1414 reset after a RESUME operation, the /proc/apm device will provide
1415 battery status information, and user-space programs will receive
1416 notification of APM "events" (e.g. battery status change).
1417
1418 If you select "Y" here, you can disable actual use of the APM
1419 BIOS by passing the "apm=off" option to the kernel at boot time.
1420
1421 Note that the APM support is almost completely disabled for
1422 machines with more than one CPU.
1423
1424 In order to use APM, you will need supporting software. For location
Randy Dunlap53471122008-03-12 18:10:51 -04001425 and more information, read <file:Documentation/power/pm.txt> and the
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001426 Battery Powered Linux mini-HOWTO, available from
1427 <http://www.tldp.org/docs.html#howto>.
1428
1429 This driver does not spin down disk drives (see the hdparm(8)
1430 manpage ("man 8 hdparm") for that), and it doesn't turn off
1431 VESA-compliant "green" monitors.
1432
1433 This driver does not support the TI 4000M TravelMate and the ACER
1434 486/DX4/75 because they don't have compliant BIOSes. Many "green"
1435 desktop machines also don't have compliant BIOSes, and this driver
1436 may cause those machines to panic during the boot phase.
1437
1438 Generally, if you don't have a battery in your machine, there isn't
1439 much point in using this driver and you should say N. If you get
1440 random kernel OOPSes or reboots that don't seem to be related to
1441 anything, try disabling/enabling this option (or disabling/enabling
1442 APM in your BIOS).
1443
1444 Some other things you should try when experiencing seemingly random,
1445 "weird" problems:
1446
1447 1) make sure that you have enough swap space and that it is
1448 enabled.
1449 2) pass the "no-hlt" option to the kernel
1450 3) switch on floating point emulation in the kernel and pass
1451 the "no387" option to the kernel
1452 4) pass the "floppy=nodma" option to the kernel
1453 5) pass the "mem=4M" option to the kernel (thereby disabling
1454 all but the first 4 MB of RAM)
1455 6) make sure that the CPU is not over clocked.
1456 7) read the sig11 FAQ at <http://www.bitwizard.nl/sig11/>
1457 8) disable the cache from your BIOS settings
1458 9) install a fan for the video card or exchange video RAM
1459 10) install a better fan for the CPU
1460 11) exchange RAM chips
1461 12) exchange the motherboard.
1462
1463 To compile this driver as a module, choose M here: the
1464 module will be called apm.
1465
1466if APM
1467
1468config APM_IGNORE_USER_SUSPEND
1469 bool "Ignore USER SUSPEND"
1470 help
1471 This option will ignore USER SUSPEND requests. On machines with a
1472 compliant APM BIOS, you want to say N. However, on the NEC Versa M
1473 series notebooks, it is necessary to say Y because of a BIOS bug.
1474
1475config APM_DO_ENABLE
1476 bool "Enable PM at boot time"
1477 ---help---
1478 Enable APM features at boot time. From page 36 of the APM BIOS
1479 specification: "When disabled, the APM BIOS does not automatically
1480 power manage devices, enter the Standby State, enter the Suspend
1481 State, or take power saving steps in response to CPU Idle calls."
1482 This driver will make CPU Idle calls when Linux is idle (unless this
1483 feature is turned off -- see "Do CPU IDLE calls", below). This
1484 should always save battery power, but more complicated APM features
1485 will be dependent on your BIOS implementation. You may need to turn
1486 this option off if your computer hangs at boot time when using APM
1487 support, or if it beeps continuously instead of suspending. Turn
1488 this off if you have a NEC UltraLite Versa 33/C or a Toshiba
1489 T400CDT. This is off by default since most machines do fine without
1490 this feature.
1491
1492config APM_CPU_IDLE
1493 bool "Make CPU Idle calls when idle"
1494 help
1495 Enable calls to APM CPU Idle/CPU Busy inside the kernel's idle loop.
1496 On some machines, this can activate improved power savings, such as
1497 a slowed CPU clock rate, when the machine is idle. These idle calls
1498 are made after the idle loop has run for some length of time (e.g.,
1499 333 mS). On some machines, this will cause a hang at boot time or
1500 whenever the CPU becomes idle. (On machines with more than one CPU,
1501 this option does nothing.)
1502
1503config APM_DISPLAY_BLANK
1504 bool "Enable console blanking using APM"
1505 help
1506 Enable console blanking using the APM. Some laptops can use this to
1507 turn off the LCD backlight when the screen blanker of the Linux
1508 virtual console blanks the screen. Note that this is only used by
1509 the virtual console screen blanker, and won't turn off the backlight
1510 when using the X Window system. This also doesn't have anything to
1511 do with your VESA-compliant power-saving monitor. Further, this
1512 option doesn't work for all laptops -- it might not turn off your
1513 backlight at all, or it might print a lot of errors to the console,
1514 especially if you are using gpm.
1515
1516config APM_ALLOW_INTS
1517 bool "Allow interrupts during APM BIOS calls"
1518 help
1519 Normally we disable external interrupts while we are making calls to
1520 the APM BIOS as a measure to lessen the effects of a badly behaving
1521 BIOS implementation. The BIOS should reenable interrupts if it
1522 needs to. Unfortunately, some BIOSes do not -- especially those in
1523 many of the newer IBM Thinkpads. If you experience hangs when you
1524 suspend, try setting this to Y. Otherwise, say N.
1525
1526config APM_REAL_MODE_POWER_OFF
1527 bool "Use real mode APM BIOS call to power off"
1528 help
1529 Use real mode APM BIOS calls to switch off the computer. This is
1530 a work-around for a number of buggy BIOSes. Switch this option on if
1531 your computer crashes instead of powering off properly.
1532
1533endif # APM
1534
1535source "arch/x86/kernel/cpu/cpufreq/Kconfig"
1536
1537source "drivers/cpuidle/Kconfig"
1538
1539endmenu
1540
1541
1542menu "Bus options (PCI etc.)"
1543
1544config PCI
Ingo Molnar1ac97012008-05-19 14:10:14 +02001545 bool "PCI support"
Adrian Bunk1c858082008-01-30 13:32:32 +01001546 default y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001547 select ARCH_SUPPORTS_MSI if (X86_LOCAL_APIC && X86_IO_APIC)
1548 help
1549 Find out whether you have a PCI motherboard. PCI is the name of a
1550 bus system, i.e. the way the CPU talks to the other stuff inside
1551 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
1552 VESA. If you have PCI, say Y, otherwise N.
1553
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001554choice
1555 prompt "PCI access mode"
Ingo Molnarefefa6f2008-07-10 16:09:50 +02001556 depends on X86_32 && PCI
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001557 default PCI_GOANY
1558 ---help---
1559 On PCI systems, the BIOS can be used to detect the PCI devices and
1560 determine their configuration. However, some old PCI motherboards
1561 have BIOS bugs and may crash if this is done. Also, some embedded
1562 PCI-based systems don't have any BIOS at all. Linux can also try to
1563 detect the PCI hardware directly without using the BIOS.
1564
1565 With this option, you can specify how Linux should detect the
1566 PCI devices. If you choose "BIOS", the BIOS will be used,
1567 if you choose "Direct", the BIOS won't be used, and if you
1568 choose "MMConfig", then PCI Express MMCONFIG will be used.
1569 If you choose "Any", the kernel will try MMCONFIG, then the
1570 direct access method and falls back to the BIOS if that doesn't
1571 work. If unsure, go with the default, which is "Any".
1572
1573config PCI_GOBIOS
1574 bool "BIOS"
1575
1576config PCI_GOMMCONFIG
1577 bool "MMConfig"
1578
1579config PCI_GODIRECT
1580 bool "Direct"
1581
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07001582config PCI_GOOLPC
1583 bool "OLPC"
1584 depends on OLPC
1585
Andres Salomon2bdd1b02008-06-05 14:14:41 -07001586config PCI_GOANY
1587 bool "Any"
1588
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001589endchoice
1590
1591config PCI_BIOS
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001592 def_bool y
Ingo Molnarefefa6f2008-07-10 16:09:50 +02001593 depends on X86_32 && PCI && (PCI_GOBIOS || PCI_GOANY)
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001594
1595# x86-64 doesn't support PCI BIOS access from long mode so always go direct.
1596config PCI_DIRECT
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001597 def_bool y
Ingo Molnarefefa6f2008-07-10 16:09:50 +02001598 depends on PCI && (X86_64 || (PCI_GODIRECT || PCI_GOANY || PCI_GOOLPC))
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001599
1600config PCI_MMCONFIG
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001601 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001602 depends on X86_32 && PCI && ACPI && (PCI_GOMMCONFIG || PCI_GOANY)
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001603
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07001604config PCI_OLPC
Andres Salomon2bdd1b02008-06-05 14:14:41 -07001605 def_bool y
1606 depends on PCI && OLPC && (PCI_GOOLPC || PCI_GOANY)
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07001607
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001608config PCI_DOMAINS
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001609 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001610 depends on PCI
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001611
1612config PCI_MMCONFIG
1613 bool "Support mmconfig PCI config space access"
1614 depends on X86_64 && PCI && ACPI
1615
1616config DMAR
1617 bool "Support for DMA Remapping Devices (EXPERIMENTAL)"
1618 depends on X86_64 && PCI_MSI && ACPI && EXPERIMENTAL
1619 help
1620 DMA remapping (DMAR) devices support enables independent address
1621 translations for Direct Memory Access (DMA) from devices.
1622 These DMA remapping devices are reported via ACPI tables
1623 and include PCI device scope covered by these DMA
1624 remapping devices.
1625
1626config DMAR_GFX_WA
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001627 def_bool y
1628 prompt "Support for Graphics workaround"
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001629 depends on DMAR
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001630 help
1631 Current Graphics drivers tend to use physical address
1632 for DMA and avoid using DMA APIs. Setting this config
1633 option permits the IOMMU driver to set a unity map for
1634 all the OS-visible memory. Hence the driver can continue
1635 to use physical addresses for DMA.
1636
1637config DMAR_FLOPPY_WA
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001638 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001639 depends on DMAR
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001640 help
1641 Floppy disk drivers are know to bypass DMA API calls
1642 thereby failing to work when IOMMU is enabled. This
1643 workaround will setup a 1:1 mapping for the first
1644 16M to make floppy (an ISA device) work.
1645
1646source "drivers/pci/pcie/Kconfig"
1647
1648source "drivers/pci/Kconfig"
1649
1650# x86_64 have no ISA slots, but do have ISA-style DMA.
1651config ISA_DMA_API
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001652 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001653
1654if X86_32
1655
1656config ISA
1657 bool "ISA support"
Ingo Molnarefefa6f2008-07-10 16:09:50 +02001658 depends on !X86_VOYAGER
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001659 help
1660 Find out whether you have ISA slots on your motherboard. ISA is the
1661 name of a bus system, i.e. the way the CPU talks to the other stuff
1662 inside your box. Other bus systems are PCI, EISA, MicroChannel
1663 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
1664 newer boards don't support it. If you have ISA, say Y, otherwise N.
1665
1666config EISA
1667 bool "EISA support"
1668 depends on ISA
1669 ---help---
1670 The Extended Industry Standard Architecture (EISA) bus was
1671 developed as an open alternative to the IBM MicroChannel bus.
1672
1673 The EISA bus provided some of the features of the IBM MicroChannel
1674 bus while maintaining backward compatibility with cards made for
1675 the older ISA bus. The EISA bus saw limited use between 1988 and
1676 1995 when it was made obsolete by the PCI bus.
1677
1678 Say Y here if you are building a kernel for an EISA-based machine.
1679
1680 Otherwise, say N.
1681
1682source "drivers/eisa/Kconfig"
1683
1684config MCA
Ingo Molnarefefa6f2008-07-10 16:09:50 +02001685 bool "MCA support" if !X86_VOYAGER
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001686 default y if X86_VOYAGER
1687 help
1688 MicroChannel Architecture is found in some IBM PS/2 machines and
1689 laptops. It is a bus system similar to PCI or ISA. See
1690 <file:Documentation/mca.txt> (and especially the web page given
1691 there) before attempting to build an MCA bus kernel.
1692
1693source "drivers/mca/Kconfig"
1694
1695config SCx200
1696 tristate "NatSemi SCx200 support"
1697 depends on !X86_VOYAGER
1698 help
1699 This provides basic support for National Semiconductor's
1700 (now AMD's) Geode processors. The driver probes for the
1701 PCI-IDs of several on-chip devices, so its a good dependency
1702 for other scx200_* drivers.
1703
1704 If compiled as a module, the driver is named scx200.
1705
1706config SCx200HR_TIMER
1707 tristate "NatSemi SCx200 27MHz High-Resolution Timer Support"
1708 depends on SCx200 && GENERIC_TIME
1709 default y
1710 help
1711 This driver provides a clocksource built upon the on-chip
1712 27MHz high-resolution timer. Its also a workaround for
1713 NSC Geode SC-1100's buggy TSC, which loses time when the
1714 processor goes idle (as is done by the scheduler). The
1715 other workaround is idle=poll boot option.
1716
1717config GEODE_MFGPT_TIMER
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001718 def_bool y
1719 prompt "Geode Multi-Function General Purpose Timer (MFGPT) events"
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001720 depends on MGEODE_LX && GENERIC_TIME && GENERIC_CLOCKEVENTS
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001721 help
1722 This driver provides a clock event source based on the MFGPT
1723 timer(s) in the CS5535 and CS5536 companion chip for the geode.
1724 MFGPTs have a better resolution and max interval than the
1725 generic PIT, and are suitable for use as high-res timers.
1726
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07001727config OLPC
1728 bool "One Laptop Per Child support"
1729 default n
1730 help
1731 Add support for detecting the unique features of the OLPC
1732 XO hardware.
1733
Sam Ravnborgbc0120f2007-11-06 23:10:39 +01001734endif # X86_32
1735
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001736config K8_NB
1737 def_bool y
Sam Ravnborgbc0120f2007-11-06 23:10:39 +01001738 depends on AGP_AMD64 || (X86_64 && (GART_IOMMU || (PCI && NUMA)))
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001739
1740source "drivers/pcmcia/Kconfig"
1741
1742source "drivers/pci/hotplug/Kconfig"
1743
1744endmenu
1745
1746
1747menu "Executable file formats / Emulations"
1748
1749source "fs/Kconfig.binfmt"
1750
1751config IA32_EMULATION
1752 bool "IA32 Emulation"
1753 depends on X86_64
Roland McGratha97f52e2008-01-30 13:31:55 +01001754 select COMPAT_BINFMT_ELF
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001755 help
1756 Include code to run 32-bit programs under a 64-bit kernel. You should
1757 likely turn this on, unless you're 100% sure that you don't have any
1758 32-bit programs left.
1759
1760config IA32_AOUT
1761 tristate "IA32 a.out support"
David Howellsb0b933c2008-02-08 04:19:27 -08001762 depends on IA32_EMULATION && ARCH_SUPPORTS_AOUT
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001763 help
1764 Support old a.out binaries in the 32bit emulation.
1765
1766config COMPAT
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001767 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001768 depends on IA32_EMULATION
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001769
1770config COMPAT_FOR_U64_ALIGNMENT
1771 def_bool COMPAT
1772 depends on X86_64
1773
1774config SYSVIPC_COMPAT
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001775 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001776 depends on X86_64 && COMPAT && SYSVIPC
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001777
1778endmenu
1779
1780
1781source "net/Kconfig"
1782
1783source "drivers/Kconfig"
1784
1785source "drivers/firmware/Kconfig"
1786
1787source "fs/Kconfig"
1788
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001789source "arch/x86/Kconfig.debug"
1790
1791source "security/Kconfig"
1792
1793source "crypto/Kconfig"
1794
Avi Kivityedf88412007-12-16 11:02:48 +02001795source "arch/x86/kvm/Kconfig"
1796
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001797source "lib/Kconfig"