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Commit | Line | Data |
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1032c0ba | 1 | # x86 configuration |
daa93fab SR |
2 | mainmenu "Linux Kernel Configuration for x86" |
3 | ||
4 | # Select 32 or 64 bit | |
5 | config 64BIT | |
6840999b SR |
6 | bool "64-bit kernel" if ARCH = "x86" |
7 | default ARCH = "x86_64" | |
daa93fab SR |
8 | 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 | ||
12 | config X86_32 | |
13 | def_bool !64BIT | |
14 | ||
15 | config X86_64 | |
16 | def_bool 64BIT | |
1032c0ba SR |
17 | |
18 | ### Arch settings | |
8d5fffb9 | 19 | config X86 |
3c2362e6 | 20 | def_bool y |
a5574cf6 | 21 | select HAVE_UNSTABLE_SCHED_CLOCK |
ec7748b5 | 22 | select HAVE_IDE |
42d4b839 | 23 | select HAVE_OPROFILE |
28b2ee20 | 24 | select HAVE_IOREMAP_PROT |
8174c430 | 25 | select HAVE_GET_USER_PAGES_FAST |
3f550096 | 26 | select HAVE_KPROBES |
1f972768 | 27 | select ARCH_WANT_OPTIONAL_GPIOLIB |
9edddaa2 | 28 | select HAVE_KRETPROBES |
677aa9f7 | 29 | select HAVE_DYNAMIC_FTRACE |
16444a8a | 30 | select HAVE_FTRACE |
1a4e3f89 | 31 | select HAVE_KVM if ((X86_32 && !X86_VOYAGER && !X86_VISWS && !X86_NUMAQ) || X86_64) |
fcbc04c0 | 32 | select HAVE_ARCH_KGDB if !X86_VOYAGER |
58340a07 | 33 | select HAVE_EFFICIENT_UNALIGNED_ACCESS |
7d8330a5 | 34 | |
73531905 | 35 | config ARCH_DEFCONFIG |
b9b39bfb | 36 | string |
73531905 SR |
37 | default "arch/x86/configs/i386_defconfig" if X86_32 |
38 | default "arch/x86/configs/x86_64_defconfig" if X86_64 | |
b9b39bfb | 39 | |
8d5fffb9 | 40 | |
95c354fe | 41 | config GENERIC_LOCKBREAK |
314cdbef | 42 | def_bool n |
95c354fe | 43 | |
8d5fffb9 | 44 | config GENERIC_TIME |
3c2362e6 | 45 | def_bool y |
8d5fffb9 SR |
46 | |
47 | config GENERIC_CMOS_UPDATE | |
3c2362e6 | 48 | def_bool y |
8d5fffb9 SR |
49 | |
50 | config CLOCKSOURCE_WATCHDOG | |
3c2362e6 | 51 | def_bool y |
8d5fffb9 SR |
52 | |
53 | config GENERIC_CLOCKEVENTS | |
3c2362e6 | 54 | def_bool y |
8d5fffb9 SR |
55 | |
56 | config GENERIC_CLOCKEVENTS_BROADCAST | |
3c2362e6 | 57 | def_bool y |
8d5fffb9 SR |
58 | depends on X86_64 || (X86_32 && X86_LOCAL_APIC) |
59 | ||
60 | config LOCKDEP_SUPPORT | |
3c2362e6 | 61 | def_bool y |
8d5fffb9 SR |
62 | |
63 | config STACKTRACE_SUPPORT | |
3c2362e6 | 64 | def_bool y |
8d5fffb9 | 65 | |
aa7d9350 HC |
66 | config HAVE_LATENCYTOP_SUPPORT |
67 | def_bool y | |
68 | ||
1f84260c CL |
69 | config FAST_CMPXCHG_LOCAL |
70 | bool | |
71 | default y | |
72 | ||
8d5fffb9 | 73 | config MMU |
3c2362e6 | 74 | def_bool y |
8d5fffb9 SR |
75 | |
76 | config ZONE_DMA | |
3c2362e6 | 77 | def_bool y |
8d5fffb9 | 78 | |
8d5fffb9 SR |
79 | config SBUS |
80 | bool | |
81 | ||
82 | config GENERIC_ISA_DMA | |
3c2362e6 | 83 | def_bool y |
8d5fffb9 SR |
84 | |
85 | config GENERIC_IOMAP | |
3c2362e6 | 86 | def_bool y |
8d5fffb9 SR |
87 | |
88 | config GENERIC_BUG | |
3c2362e6 | 89 | def_bool y |
8d5fffb9 SR |
90 | depends on BUG |
91 | ||
92 | config GENERIC_HWEIGHT | |
3c2362e6 | 93 | def_bool y |
8d5fffb9 | 94 | |
a6082959 FF |
95 | config GENERIC_GPIO |
96 | def_bool n | |
97 | ||
8d5fffb9 | 98 | config ARCH_MAY_HAVE_PC_FDC |
3c2362e6 | 99 | def_bool y |
8d5fffb9 | 100 | |
1032c0ba SR |
101 | config RWSEM_GENERIC_SPINLOCK |
102 | def_bool !X86_XADD | |
103 | ||
104 | config RWSEM_XCHGADD_ALGORITHM | |
105 | def_bool X86_XADD | |
106 | ||
107 | config ARCH_HAS_ILOG2_U32 | |
108 | def_bool n | |
109 | ||
110 | config ARCH_HAS_ILOG2_U64 | |
111 | def_bool n | |
112 | ||
a6869cc4 VP |
113 | config ARCH_HAS_CPU_IDLE_WAIT |
114 | def_bool y | |
115 | ||
1032c0ba SR |
116 | config GENERIC_CALIBRATE_DELAY |
117 | def_bool y | |
118 | ||
8d5fffb9 SR |
119 | config GENERIC_TIME_VSYSCALL |
120 | bool | |
121 | default X86_64 | |
122 | ||
9a0b8415 | 123 | config ARCH_HAS_CPU_RELAX |
124 | def_bool y | |
125 | ||
1b27d05b PE |
126 | config ARCH_HAS_CACHE_LINE_SIZE |
127 | def_bool y | |
128 | ||
dd5af90a | 129 | config HAVE_SETUP_PER_CPU_AREA |
23ca4bba | 130 | def_bool X86_64_SMP || (X86_SMP && !X86_VOYAGER) |
b32ef636 | 131 | |
9f0e8d04 MT |
132 | config HAVE_CPUMASK_OF_CPU_MAP |
133 | def_bool X86_64_SMP | |
134 | ||
801e4062 JB |
135 | config ARCH_HIBERNATION_POSSIBLE |
136 | def_bool y | |
137 | depends on !SMP || !X86_VOYAGER | |
138 | ||
f4cb5700 JB |
139 | config ARCH_SUSPEND_POSSIBLE |
140 | def_bool y | |
141 | depends on !X86_VOYAGER | |
142 | ||
8d5fffb9 SR |
143 | config ZONE_DMA32 |
144 | bool | |
145 | default X86_64 | |
146 | ||
147 | config ARCH_POPULATES_NODE_MAP | |
148 | def_bool y | |
149 | ||
150 | config AUDIT_ARCH | |
151 | bool | |
152 | default X86_64 | |
153 | ||
b0b933c0 DH |
154 | config ARCH_SUPPORTS_AOUT |
155 | def_bool y | |
156 | ||
765c68bd IM |
157 | config ARCH_SUPPORTS_OPTIMIZED_INLINING |
158 | def_bool y | |
159 | ||
8d5fffb9 SR |
160 | # Use the generic interrupt handling code in kernel/irq/: |
161 | config GENERIC_HARDIRQS | |
162 | bool | |
163 | default y | |
164 | ||
165 | config GENERIC_IRQ_PROBE | |
166 | bool | |
167 | default y | |
168 | ||
169 | config GENERIC_PENDING_IRQ | |
170 | bool | |
171 | depends on GENERIC_HARDIRQS && SMP | |
172 | default y | |
173 | ||
174 | config X86_SMP | |
175 | bool | |
6b0c3d44 | 176 | depends on SMP && ((X86_32 && !X86_VOYAGER) || X86_64) |
3b16cf87 | 177 | select USE_GENERIC_SMP_HELPERS |
8d5fffb9 SR |
178 | default y |
179 | ||
6b0c3d44 SR |
180 | config X86_32_SMP |
181 | def_bool y | |
182 | depends on X86_32 && SMP | |
183 | ||
184 | config X86_64_SMP | |
185 | def_bool y | |
186 | depends on X86_64 && SMP | |
187 | ||
8d5fffb9 SR |
188 | config X86_HT |
189 | bool | |
ee0011a7 | 190 | depends on SMP |
efefa6f6 | 191 | depends on (X86_32 && !X86_VOYAGER) || X86_64 |
8d5fffb9 SR |
192 | default y |
193 | ||
194 | config X86_BIOS_REBOOT | |
195 | bool | |
31ac409a | 196 | depends on !X86_VOYAGER |
8d5fffb9 SR |
197 | default y |
198 | ||
199 | config X86_TRAMPOLINE | |
200 | bool | |
e44b7b75 | 201 | depends on X86_SMP || (X86_VOYAGER && SMP) || (64BIT && ACPI_SLEEP) |
8d5fffb9 SR |
202 | default y |
203 | ||
204 | config KTIME_SCALAR | |
205 | def_bool X86_32 | |
506f1d07 | 206 | source "init/Kconfig" |
8d5fffb9 | 207 | |
506f1d07 SR |
208 | menu "Processor type and features" |
209 | ||
210 | source "kernel/time/Kconfig" | |
211 | ||
212 | config 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 | ||
03502faa | 234 | See also <file:Documentation/i386/IO-APIC.txt>, |
506f1d07 SR |
235 | <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 | ||
6695c85b YL |
240 | config X86_FIND_SMP_CONFIG |
241 | def_bool y | |
1b84e1c8 | 242 | depends on X86_MPPARSE || X86_VOYAGER |
6695c85b YL |
243 | |
244 | if ACPI | |
245 | config X86_MPPARSE | |
246 | def_bool y | |
247 | bool "Enable MPS table" | |
5ab74722 | 248 | depends on X86_LOCAL_APIC |
6695c85b YL |
249 | 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 | |
252 | endif | |
253 | ||
254 | if !ACPI | |
255 | config X86_MPPARSE | |
256 | def_bool y | |
5ab74722 | 257 | depends on X86_LOCAL_APIC |
6695c85b YL |
258 | endif |
259 | ||
506f1d07 SR |
260 | choice |
261 | prompt "Subarchitecture Type" | |
262 | default X86_PC | |
263 | ||
264 | config X86_PC | |
265 | bool "PC-compatible" | |
266 | help | |
267 | Choose this option if your computer is a standard PC or compatible. | |
268 | ||
269 | config 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 | ||
279 | config X86_VOYAGER | |
280 | bool "Voyager (NCR)" | |
1ac97018 | 281 | depends on X86_32 && (SMP || BROKEN) && !PCI |
506f1d07 SR |
282 | 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 | ||
506f1d07 | 291 | config X86_GENERICARCH |
d49c4288 | 292 | bool "Generic architecture" |
506f1d07 SR |
293 | depends on X86_32 |
294 | help | |
d49c4288 YL |
295 | 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 | ||
300 | if X86_GENERICARCH | |
301 | ||
302 | config X86_NUMAQ | |
303 | bool "NUMAQ (IBM/Sequent)" | |
3de352bb | 304 | depends on SMP && X86_32 && PCI && X86_MPPARSE |
d49c4288 YL |
305 | select NUMA |
306 | help | |
307 | 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>. | |
312 | ||
313 | config 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. | |
506f1d07 SR |
319 | |
320 | config 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. | |
d49c4288 YL |
326 | |
327 | config 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 | ||
334 | endif | |
506f1d07 SR |
335 | |
336 | config X86_VSMP | |
337 | bool "Support for ScaleMP vSMP" | |
96597fd2 | 338 | select PARAVIRT |
a6784ad7 | 339 | depends on X86_64 && PCI |
96597fd2 | 340 | help |
506f1d07 SR |
341 | 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 | ||
345 | endchoice | |
346 | ||
1b84e1c8 IM |
347 | config X86_VISWS |
348 | bool "SGI 320/540 (Visual Workstation)" | |
39415a44 | 349 | depends on X86_32 && PCI && !X86_VOYAGER && X86_MPPARSE && PCI_GODIRECT |
1b84e1c8 IM |
350 | 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 | ||
1f972768 IM |
359 | config 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 | ||
506f1d07 | 369 | config SCHED_NO_NO_OMIT_FRAME_POINTER |
3c2362e6 HH |
370 | def_bool y |
371 | prompt "Single-depth WCHAN output" | |
506f1d07 SR |
372 | 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 | ||
506f1d07 SR |
381 | menuconfig PARAVIRT_GUEST |
382 | bool "Paravirtualized guest support" | |
506f1d07 SR |
383 | 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 | ||
389 | if PARAVIRT_GUEST | |
390 | ||
391 | source "arch/x86/xen/Kconfig" | |
392 | ||
393 | config VMI | |
394 | bool "VMI Guest support" | |
395 | select PARAVIRT | |
42d545c9 | 396 | depends on X86_32 |
efefa6f6 | 397 | depends on !X86_VOYAGER |
506f1d07 SR |
398 | 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 | ||
790c73f6 GOC |
404 | config KVM_CLOCK |
405 | bool "KVM paravirtualized clock" | |
406 | select PARAVIRT | |
f6e16d5a | 407 | select PARAVIRT_CLOCK |
efefa6f6 | 408 | depends on !X86_VOYAGER |
790c73f6 GOC |
409 | 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 | ||
0cf1bfd2 MT |
416 | config KVM_GUEST |
417 | bool "KVM Guest support" | |
418 | select PARAVIRT | |
efefa6f6 | 419 | depends on !X86_VOYAGER |
0cf1bfd2 MT |
420 | help |
421 | This option enables various optimizations for running under the KVM | |
422 | hypervisor. | |
423 | ||
506f1d07 SR |
424 | source "arch/x86/lguest/Kconfig" |
425 | ||
e61bd94a EPH |
426 | config PARAVIRT |
427 | bool "Enable paravirtualization code" | |
efefa6f6 | 428 | depends on !X86_VOYAGER |
e61bd94a EPH |
429 | 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 | ||
7af192c9 GH |
435 | config PARAVIRT_CLOCK |
436 | bool | |
437 | default n | |
438 | ||
506f1d07 SR |
439 | endif |
440 | ||
97349135 JF |
441 | config 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 | ||
03273184 YL |
448 | config MEMTEST |
449 | bool "Memtest" | |
c64df707 YL |
450 | help |
451 | This option adds a kernel parameter 'memtest', which allows memtest | |
03273184 YL |
452 | 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. | |
aba3728c | 457 | If you are unsure how to answer this question, answer N. |
c64df707 | 458 | |
506f1d07 | 459 | config X86_SUMMIT_NUMA |
3c2362e6 | 460 | def_bool y |
0699eae1 | 461 | depends on X86_32 && NUMA && X86_GENERICARCH |
506f1d07 SR |
462 | |
463 | config X86_CYCLONE_TIMER | |
3c2362e6 | 464 | def_bool y |
0699eae1 | 465 | depends on X86_GENERICARCH |
506f1d07 SR |
466 | |
467 | config ES7000_CLUSTERED_APIC | |
3c2362e6 | 468 | def_bool y |
506f1d07 SR |
469 | depends on SMP && X86_ES7000 && MPENTIUMIII |
470 | ||
471 | source "arch/x86/Kconfig.cpu" | |
472 | ||
473 | config HPET_TIMER | |
3c2362e6 | 474 | def_bool X86_64 |
506f1d07 | 475 | prompt "HPET Timer Support" if X86_32 |
506f1d07 SR |
476 | 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 | ||
492 | config HPET_EMULATE_RTC | |
3c2362e6 | 493 | def_bool y |
9d8af78b | 494 | depends on HPET_TIMER && (RTC=y || RTC=m || RTC_DRV_CMOS=m || RTC_DRV_CMOS=y) |
506f1d07 SR |
495 | |
496 | # Mark as embedded because too many people got it wrong. | |
497 | # The code disables itself when not needed. | |
7ae9392c TP |
498 | config 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 | ||
506f1d07 SR |
507 | config 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 | ||
524 | config 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 | ||
542 | config CALGARY_IOMMU_ENABLED_BY_DEFAULT | |
3c2362e6 HH |
543 | def_bool y |
544 | prompt "Should Calgary be enabled by default?" | |
506f1d07 SR |
545 | 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 | ||
2b188723 JR |
553 | config AMD_IOMMU |
554 | bool "AMD IOMMU support" | |
07c40e8a | 555 | select SWIOTLB |
24d2ba0a | 556 | depends on X86_64 && PCI && ACPI |
2b188723 | 557 | help |
18d22200 JR |
558 | 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. | |
2b188723 | 567 | |
506f1d07 SR |
568 | # need this always selected by IOMMU for the VIA workaround |
569 | config 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 | ||
a8522509 | 578 | config IOMMU_HELPER |
18b743dc | 579 | def_bool (CALGARY_IOMMU || GART_IOMMU || SWIOTLB || AMD_IOMMU) |
1184dc2f MT |
580 | config MAXSMP |
581 | bool "Configure Maximum number of SMP Processors and NUMA Nodes" | |
582 | depends on X86_64 && SMP | |
583 | default n | |
584 | help | |
585 | Configure maximum number of CPUS and NUMA Nodes for this architecture. | |
586 | If unsure, say N. | |
506f1d07 | 587 | |
1184dc2f | 588 | if MAXSMP |
506f1d07 | 589 | config NR_CPUS |
1184dc2f MT |
590 | int |
591 | default "4096" | |
592 | endif | |
593 | ||
594 | if !MAXSMP | |
506f1d07 | 595 | config NR_CPUS |
c3ed6429 MT |
596 | int "Maximum number of CPUs (2-4096)" |
597 | range 2 4096 | |
506f1d07 SR |
598 | depends on SMP |
599 | default "32" if X86_NUMAQ || X86_SUMMIT || X86_BIGSMP || X86_ES7000 | |
600 | default "8" | |
601 | help | |
602 | This allows you to specify the maximum number of CPUs which this | |
c3ed6429 | 603 | kernel will support. The maximum supported value is 4096 and the |
506f1d07 SR |
604 | minimum value which makes sense is 2. |
605 | ||
606 | This is purely to save memory - each supported CPU adds | |
607 | approximately eight kilobytes to the kernel image. | |
1184dc2f | 608 | endif |
506f1d07 SR |
609 | |
610 | config SCHED_SMT | |
611 | bool "SMT (Hyperthreading) scheduler support" | |
b089c12b | 612 | depends on X86_HT |
506f1d07 SR |
613 | help |
614 | SMT scheduler support improves the CPU scheduler's decision making | |
615 | when dealing with Intel Pentium 4 chips with HyperThreading at a | |
616 | cost of slightly increased overhead in some places. If unsure say | |
617 | N here. | |
618 | ||
619 | config SCHED_MC | |
3c2362e6 HH |
620 | def_bool y |
621 | prompt "Multi-core scheduler support" | |
b089c12b | 622 | depends on X86_HT |
506f1d07 SR |
623 | help |
624 | Multi-core scheduler support improves the CPU scheduler's decision | |
625 | making when dealing with multi-core CPU chips at a cost of slightly | |
626 | increased overhead in some places. If unsure say N here. | |
627 | ||
628 | source "kernel/Kconfig.preempt" | |
629 | ||
630 | config X86_UP_APIC | |
631 | bool "Local APIC support on uniprocessors" | |
efefa6f6 | 632 | depends on X86_32 && !SMP && !(X86_VOYAGER || X86_GENERICARCH) |
506f1d07 SR |
633 | help |
634 | A local APIC (Advanced Programmable Interrupt Controller) is an | |
635 | integrated interrupt controller in the CPU. If you have a single-CPU | |
636 | system which has a processor with a local APIC, you can say Y here to | |
637 | enable and use it. If you say Y here even though your machine doesn't | |
638 | have a local APIC, then the kernel will still run with no slowdown at | |
639 | all. The local APIC supports CPU-generated self-interrupts (timer, | |
640 | performance counters), and the NMI watchdog which detects hard | |
641 | lockups. | |
642 | ||
643 | config X86_UP_IOAPIC | |
644 | bool "IO-APIC support on uniprocessors" | |
645 | depends on X86_UP_APIC | |
646 | help | |
647 | An IO-APIC (I/O Advanced Programmable Interrupt Controller) is an | |
648 | SMP-capable replacement for PC-style interrupt controllers. Most | |
649 | SMP systems and many recent uniprocessor systems have one. | |
650 | ||
651 | If you have a single-CPU system with an IO-APIC, you can say Y here | |
652 | to use it. If you say Y here even though your machine doesn't have | |
653 | an IO-APIC, then the kernel will still run with no slowdown at all. | |
654 | ||
655 | config X86_LOCAL_APIC | |
3c2362e6 | 656 | def_bool y |
efefa6f6 | 657 | depends on X86_64 || (X86_32 && (X86_UP_APIC || (SMP && !X86_VOYAGER) || X86_GENERICARCH)) |
506f1d07 SR |
658 | |
659 | config X86_IO_APIC | |
3c2362e6 | 660 | def_bool y |
efefa6f6 | 661 | depends on X86_64 || (X86_32 && (X86_UP_IOAPIC || (SMP && !X86_VOYAGER) || X86_GENERICARCH)) |
506f1d07 SR |
662 | |
663 | config X86_VISWS_APIC | |
3c2362e6 | 664 | def_bool y |
506f1d07 | 665 | depends on X86_32 && X86_VISWS |
506f1d07 SR |
666 | |
667 | config X86_MCE | |
668 | bool "Machine Check Exception" | |
669 | depends on !X86_VOYAGER | |
670 | ---help--- | |
671 | Machine Check Exception support allows the processor to notify the | |
672 | kernel if it detects a problem (e.g. overheating, component failure). | |
673 | The action the kernel takes depends on the severity of the problem, | |
674 | ranging from a warning message on the console, to halting the machine. | |
675 | Your processor must be a Pentium or newer to support this - check the | |
676 | flags in /proc/cpuinfo for mce. Note that some older Pentium systems | |
677 | have a design flaw which leads to false MCE events - hence MCE is | |
678 | disabled on all P5 processors, unless explicitly enabled with "mce" | |
679 | as a boot argument. Similarly, if MCE is built in and creates a | |
680 | problem on some new non-standard machine, you can boot with "nomce" | |
681 | to disable it. MCE support simply ignores non-MCE processors like | |
682 | the 386 and 486, so nearly everyone can say Y here. | |
683 | ||
684 | config X86_MCE_INTEL | |
3c2362e6 HH |
685 | def_bool y |
686 | prompt "Intel MCE features" | |
506f1d07 | 687 | depends on X86_64 && X86_MCE && X86_LOCAL_APIC |
506f1d07 SR |
688 | help |
689 | Additional support for intel specific MCE features such as | |
690 | the thermal monitor. | |
691 | ||
692 | config X86_MCE_AMD | |
3c2362e6 HH |
693 | def_bool y |
694 | prompt "AMD MCE features" | |
506f1d07 | 695 | depends on X86_64 && X86_MCE && X86_LOCAL_APIC |
506f1d07 SR |
696 | help |
697 | Additional support for AMD specific MCE features such as | |
698 | the DRAM Error Threshold. | |
699 | ||
700 | config X86_MCE_NONFATAL | |
701 | tristate "Check for non-fatal errors on AMD Athlon/Duron / Intel Pentium 4" | |
702 | depends on X86_32 && X86_MCE | |
703 | help | |
704 | Enabling this feature starts a timer that triggers every 5 seconds which | |
705 | will look at the machine check registers to see if anything happened. | |
706 | Non-fatal problems automatically get corrected (but still logged). | |
707 | Disable this if you don't want to see these messages. | |
708 | Seeing the messages this option prints out may be indicative of dying | |
709 | or out-of-spec (ie, overclocked) hardware. | |
710 | This option only does something on certain CPUs. | |
711 | (AMD Athlon/Duron and Intel Pentium 4) | |
712 | ||
713 | config X86_MCE_P4THERMAL | |
714 | bool "check for P4 thermal throttling interrupt." | |
efefa6f6 | 715 | depends on X86_32 && X86_MCE && (X86_UP_APIC || SMP) |
506f1d07 SR |
716 | help |
717 | Enabling this feature will cause a message to be printed when the P4 | |
718 | enters thermal throttling. | |
719 | ||
720 | config VM86 | |
721 | bool "Enable VM86 support" if EMBEDDED | |
722 | default y | |
723 | depends on X86_32 | |
724 | help | |
725 | This option is required by programs like DOSEMU to run 16-bit legacy | |
726 | code on X86 processors. It also may be needed by software like | |
727 | XFree86 to initialize some video cards via BIOS. Disabling this | |
728 | option saves about 6k. | |
729 | ||
730 | config TOSHIBA | |
731 | tristate "Toshiba Laptop support" | |
732 | depends on X86_32 | |
733 | ---help--- | |
734 | This adds a driver to safely access the System Management Mode of | |
735 | the CPU on Toshiba portables with a genuine Toshiba BIOS. It does | |
736 | not work on models with a Phoenix BIOS. The System Management Mode | |
737 | is used to set the BIOS and power saving options on Toshiba portables. | |
738 | ||
739 | For information on utilities to make use of this driver see the | |
740 | Toshiba Linux utilities web site at: | |
741 | <http://www.buzzard.org.uk/toshiba/>. | |
742 | ||
743 | Say Y if you intend to run this kernel on a Toshiba portable. | |
744 | Say N otherwise. | |
745 | ||
746 | config I8K | |
747 | tristate "Dell laptop support" | |
506f1d07 SR |
748 | ---help--- |
749 | This adds a driver to safely access the System Management Mode | |
750 | of the CPU on the Dell Inspiron 8000. The System Management Mode | |
751 | is used to read cpu temperature and cooling fan status and to | |
752 | control the fans on the I8K portables. | |
753 | ||
754 | This driver has been tested only on the Inspiron 8000 but it may | |
755 | also work with other Dell laptops. You can force loading on other | |
756 | models by passing the parameter `force=1' to the module. Use at | |
757 | your own risk. | |
758 | ||
759 | For information on utilities to make use of this driver see the | |
760 | I8K Linux utilities web site at: | |
761 | <http://people.debian.org/~dz/i8k/> | |
762 | ||
763 | Say Y if you intend to run this kernel on a Dell Inspiron 8000. | |
764 | Say N otherwise. | |
765 | ||
766 | config X86_REBOOTFIXUPS | |
3c2362e6 HH |
767 | def_bool n |
768 | prompt "Enable X86 board specific fixups for reboot" | |
506f1d07 | 769 | depends on X86_32 && X86 |
506f1d07 SR |
770 | ---help--- |
771 | This enables chipset and/or board specific fixups to be done | |
772 | in order to get reboot to work correctly. This is only needed on | |
773 | some combinations of hardware and BIOS. The symptom, for which | |
774 | this config is intended, is when reboot ends with a stalled/hung | |
775 | system. | |
776 | ||
777 | Currently, the only fixup is for the Geode machines using | |
5e3a77e9 | 778 | CS5530A and CS5536 chipsets and the RDC R-321x SoC. |
506f1d07 SR |
779 | |
780 | Say Y if you want to enable the fixup. Currently, it's safe to | |
781 | enable this option even if you don't need it. | |
782 | Say N otherwise. | |
783 | ||
784 | config MICROCODE | |
785 | tristate "/dev/cpu/microcode - Intel IA32 CPU microcode support" | |
786 | select FW_LOADER | |
787 | ---help--- | |
788 | If you say Y here, you will be able to update the microcode on | |
789 | Intel processors in the IA32 family, e.g. Pentium Pro, Pentium II, | |
790 | Pentium III, Pentium 4, Xeon etc. You will obviously need the | |
791 | actual microcode binary data itself which is not shipped with the | |
792 | Linux kernel. | |
793 | ||
794 | For latest news and information on obtaining all the required | |
795 | ingredients for this driver, check: | |
796 | <http://www.urbanmyth.org/microcode/>. | |
797 | ||
798 | To compile this driver as a module, choose M here: the | |
799 | module will be called microcode. | |
800 | ||
801 | config MICROCODE_OLD_INTERFACE | |
3c2362e6 | 802 | def_bool y |
506f1d07 | 803 | depends on MICROCODE |
506f1d07 SR |
804 | |
805 | config X86_MSR | |
806 | tristate "/dev/cpu/*/msr - Model-specific register support" | |
807 | help | |
808 | This device gives privileged processes access to the x86 | |
809 | Model-Specific Registers (MSRs). It is a character device with | |
810 | major 202 and minors 0 to 31 for /dev/cpu/0/msr to /dev/cpu/31/msr. | |
811 | MSR accesses are directed to a specific CPU on multi-processor | |
812 | systems. | |
813 | ||
814 | config X86_CPUID | |
815 | tristate "/dev/cpu/*/cpuid - CPU information support" | |
816 | help | |
817 | This device gives processes access to the x86 CPUID instruction to | |
818 | be executed on a specific processor. It is a character device | |
819 | with major 203 and minors 0 to 31 for /dev/cpu/0/cpuid to | |
820 | /dev/cpu/31/cpuid. | |
821 | ||
822 | choice | |
823 | prompt "High Memory Support" | |
824 | default HIGHMEM4G if !X86_NUMAQ | |
825 | default HIGHMEM64G if X86_NUMAQ | |
826 | depends on X86_32 | |
827 | ||
828 | config NOHIGHMEM | |
829 | bool "off" | |
830 | depends on !X86_NUMAQ | |
831 | ---help--- | |
832 | Linux can use up to 64 Gigabytes of physical memory on x86 systems. | |
833 | However, the address space of 32-bit x86 processors is only 4 | |
834 | Gigabytes large. That means that, if you have a large amount of | |
835 | physical memory, not all of it can be "permanently mapped" by the | |
836 | kernel. The physical memory that's not permanently mapped is called | |
837 | "high memory". | |
838 | ||
839 | If you are compiling a kernel which will never run on a machine with | |
840 | more than 1 Gigabyte total physical RAM, answer "off" here (default | |
841 | choice and suitable for most users). This will result in a "3GB/1GB" | |
842 | split: 3GB are mapped so that each process sees a 3GB virtual memory | |
843 | space and the remaining part of the 4GB virtual memory space is used | |
844 | by the kernel to permanently map as much physical memory as | |
845 | possible. | |
846 | ||
847 | If the machine has between 1 and 4 Gigabytes physical RAM, then | |
848 | answer "4GB" here. | |
849 | ||
850 | If more than 4 Gigabytes is used then answer "64GB" here. This | |
851 | selection turns Intel PAE (Physical Address Extension) mode on. | |
852 | PAE implements 3-level paging on IA32 processors. PAE is fully | |
853 | supported by Linux, PAE mode is implemented on all recent Intel | |
854 | processors (Pentium Pro and better). NOTE: If you say "64GB" here, | |
855 | then the kernel will not boot on CPUs that don't support PAE! | |
856 | ||
857 | The actual amount of total physical memory will either be | |
858 | auto detected or can be forced by using a kernel command line option | |
859 | such as "mem=256M". (Try "man bootparam" or see the documentation of | |
860 | your boot loader (lilo or loadlin) about how to pass options to the | |
861 | kernel at boot time.) | |
862 | ||
863 | If unsure, say "off". | |
864 | ||
865 | config HIGHMEM4G | |
866 | bool "4GB" | |
867 | depends on !X86_NUMAQ | |
868 | help | |
869 | Select this if you have a 32-bit processor and between 1 and 4 | |
870 | gigabytes of physical RAM. | |
871 | ||
872 | config HIGHMEM64G | |
873 | bool "64GB" | |
874 | depends on !M386 && !M486 | |
875 | select X86_PAE | |
876 | help | |
877 | Select this if you have a 32-bit processor and more than 4 | |
878 | gigabytes of physical RAM. | |
879 | ||
880 | endchoice | |
881 | ||
882 | choice | |
883 | depends on EXPERIMENTAL | |
884 | prompt "Memory split" if EMBEDDED | |
885 | default VMSPLIT_3G | |
886 | depends on X86_32 | |
887 | help | |
888 | Select the desired split between kernel and user memory. | |
889 | ||
890 | If the address range available to the kernel is less than the | |
891 | physical memory installed, the remaining memory will be available | |
892 | as "high memory". Accessing high memory is a little more costly | |
893 | than low memory, as it needs to be mapped into the kernel first. | |
894 | Note that increasing the kernel address space limits the range | |
895 | available to user programs, making the address space there | |
896 | tighter. Selecting anything other than the default 3G/1G split | |
897 | will also likely make your kernel incompatible with binary-only | |
898 | kernel modules. | |
899 | ||
900 | If you are not absolutely sure what you are doing, leave this | |
901 | option alone! | |
902 | ||
903 | config VMSPLIT_3G | |
904 | bool "3G/1G user/kernel split" | |
905 | config VMSPLIT_3G_OPT | |
906 | depends on !X86_PAE | |
907 | bool "3G/1G user/kernel split (for full 1G low memory)" | |
908 | config VMSPLIT_2G | |
909 | bool "2G/2G user/kernel split" | |
910 | config VMSPLIT_2G_OPT | |
911 | depends on !X86_PAE | |
912 | bool "2G/2G user/kernel split (for full 2G low memory)" | |
913 | config VMSPLIT_1G | |
914 | bool "1G/3G user/kernel split" | |
915 | endchoice | |
916 | ||
917 | config PAGE_OFFSET | |
918 | hex | |
919 | default 0xB0000000 if VMSPLIT_3G_OPT | |
920 | default 0x80000000 if VMSPLIT_2G | |
921 | default 0x78000000 if VMSPLIT_2G_OPT | |
922 | default 0x40000000 if VMSPLIT_1G | |
923 | default 0xC0000000 | |
924 | depends on X86_32 | |
925 | ||
926 | config HIGHMEM | |
3c2362e6 | 927 | def_bool y |
506f1d07 | 928 | depends on X86_32 && (HIGHMEM64G || HIGHMEM4G) |
506f1d07 SR |
929 | |
930 | config X86_PAE | |
3c2362e6 HH |
931 | def_bool n |
932 | prompt "PAE (Physical Address Extension) Support" | |
506f1d07 SR |
933 | depends on X86_32 && !HIGHMEM4G |
934 | select RESOURCES_64BIT | |
935 | help | |
936 | PAE is required for NX support, and furthermore enables | |
937 | larger swapspace support for non-overcommit purposes. It | |
938 | has the cost of more pagetable lookup overhead, and also | |
939 | consumes more pagetable space per process. | |
940 | ||
941 | # Common NUMA Features | |
942 | config NUMA | |
943 | bool "Numa Memory Allocation and Scheduler Support (EXPERIMENTAL)" | |
944 | depends on SMP | |
0699eae1 | 945 | depends on X86_64 || (X86_32 && HIGHMEM64G && (X86_NUMAQ || X86_BIGSMP || X86_SUMMIT && ACPI) && EXPERIMENTAL) |
506f1d07 | 946 | default n if X86_PC |
0699eae1 | 947 | default y if (X86_NUMAQ || X86_SUMMIT || X86_BIGSMP) |
506f1d07 SR |
948 | help |
949 | Enable NUMA (Non Uniform Memory Access) support. | |
950 | The kernel will try to allocate memory used by a CPU on the | |
951 | local memory controller of the CPU and add some more | |
952 | NUMA awareness to the kernel. | |
953 | ||
954 | For i386 this is currently highly experimental and should be only | |
955 | used for kernel development. It might also cause boot failures. | |
956 | For x86_64 this is recommended on all multiprocessor Opteron systems. | |
957 | If the system is EM64T, you should say N unless your system is | |
958 | EM64T NUMA. | |
959 | ||
960 | comment "NUMA (Summit) requires SMP, 64GB highmem support, ACPI" | |
961 | depends on X86_32 && X86_SUMMIT && (!HIGHMEM64G || !ACPI) | |
962 | ||
963 | config K8_NUMA | |
3c2362e6 HH |
964 | def_bool y |
965 | prompt "Old style AMD Opteron NUMA detection" | |
966 | depends on X86_64 && NUMA && PCI | |
967 | help | |
506f1d07 SR |
968 | Enable K8 NUMA node topology detection. You should say Y here if |
969 | you have a multi processor AMD K8 system. This uses an old | |
970 | method to read the NUMA configuration directly from the builtin | |
971 | Northbridge of Opteron. It is recommended to use X86_64_ACPI_NUMA | |
972 | instead, which also takes priority if both are compiled in. | |
973 | ||
974 | config X86_64_ACPI_NUMA | |
3c2362e6 HH |
975 | def_bool y |
976 | prompt "ACPI NUMA detection" | |
506f1d07 SR |
977 | depends on X86_64 && NUMA && ACPI && PCI |
978 | select ACPI_NUMA | |
506f1d07 SR |
979 | help |
980 | Enable ACPI SRAT based node topology detection. | |
981 | ||
6ec6e0d9 SS |
982 | # Some NUMA nodes have memory ranges that span |
983 | # other nodes. Even though a pfn is valid and | |
984 | # between a node's start and end pfns, it may not | |
985 | # reside on that node. See memmap_init_zone() | |
986 | # for details. | |
987 | config NODES_SPAN_OTHER_NODES | |
988 | def_bool y | |
989 | depends on X86_64_ACPI_NUMA | |
990 | ||
506f1d07 SR |
991 | config NUMA_EMU |
992 | bool "NUMA emulation" | |
993 | depends on X86_64 && NUMA | |
994 | help | |
995 | Enable NUMA emulation. A flat machine will be split | |
996 | into virtual nodes when booted with "numa=fake=N", where N is the | |
997 | number of nodes. This is only useful for debugging. | |
998 | ||
1184dc2f MT |
999 | if MAXSMP |
1000 | ||
1001 | config NODES_SHIFT | |
1002 | int | |
1003 | default "9" | |
1004 | endif | |
1005 | ||
1006 | if !MAXSMP | |
506f1d07 | 1007 | config NODES_SHIFT |
1184dc2f MT |
1008 | int "Maximum NUMA Nodes (as a power of 2)" |
1009 | range 1 9 if X86_64 | |
506f1d07 SR |
1010 | default "6" if X86_64 |
1011 | default "4" if X86_NUMAQ | |
1012 | default "3" | |
1013 | depends on NEED_MULTIPLE_NODES | |
1184dc2f MT |
1014 | help |
1015 | Specify the maximum number of NUMA Nodes available on the target | |
1016 | system. Increases memory reserved to accomodate various tables. | |
1017 | endif | |
506f1d07 SR |
1018 | |
1019 | config HAVE_ARCH_BOOTMEM_NODE | |
3c2362e6 | 1020 | def_bool y |
506f1d07 | 1021 | depends on X86_32 && NUMA |
506f1d07 SR |
1022 | |
1023 | config ARCH_HAVE_MEMORY_PRESENT | |
3c2362e6 | 1024 | def_bool y |
506f1d07 | 1025 | depends on X86_32 && DISCONTIGMEM |
506f1d07 SR |
1026 | |
1027 | config NEED_NODE_MEMMAP_SIZE | |
3c2362e6 | 1028 | def_bool y |
506f1d07 | 1029 | depends on X86_32 && (DISCONTIGMEM || SPARSEMEM) |
506f1d07 SR |
1030 | |
1031 | config HAVE_ARCH_ALLOC_REMAP | |
3c2362e6 | 1032 | def_bool y |
506f1d07 | 1033 | depends on X86_32 && NUMA |
506f1d07 SR |
1034 | |
1035 | config ARCH_FLATMEM_ENABLE | |
1036 | def_bool y | |
409a7b85 | 1037 | depends on X86_32 && ARCH_SELECT_MEMORY_MODEL && X86_PC && !NUMA |
506f1d07 SR |
1038 | |
1039 | config ARCH_DISCONTIGMEM_ENABLE | |
1040 | def_bool y | |
b263295d | 1041 | depends on NUMA && X86_32 |
506f1d07 SR |
1042 | |
1043 | config ARCH_DISCONTIGMEM_DEFAULT | |
1044 | def_bool y | |
b263295d CL |
1045 | depends on NUMA && X86_32 |
1046 | ||
1047 | config ARCH_SPARSEMEM_DEFAULT | |
1048 | def_bool y | |
1049 | depends on X86_64 | |
506f1d07 SR |
1050 | |
1051 | config ARCH_SPARSEMEM_ENABLE | |
1052 | def_bool y | |
b263295d | 1053 | depends on X86_64 || NUMA || (EXPERIMENTAL && X86_PC) |
506f1d07 SR |
1054 | select SPARSEMEM_STATIC if X86_32 |
1055 | select SPARSEMEM_VMEMMAP_ENABLE if X86_64 | |
1056 | ||
1057 | config ARCH_SELECT_MEMORY_MODEL | |
1058 | def_bool y | |
b263295d | 1059 | depends on ARCH_SPARSEMEM_ENABLE |
506f1d07 SR |
1060 | |
1061 | config ARCH_MEMORY_PROBE | |
1062 | def_bool X86_64 | |
1063 | depends on MEMORY_HOTPLUG | |
1064 | ||
1065 | source "mm/Kconfig" | |
1066 | ||
1067 | config HIGHPTE | |
1068 | bool "Allocate 3rd-level pagetables from highmem" | |
1069 | depends on X86_32 && (HIGHMEM4G || HIGHMEM64G) | |
1070 | help | |
1071 | The VM uses one page table entry for each page of physical memory. | |
1072 | For systems with a lot of RAM, this can be wasteful of precious | |
1073 | low memory. Setting this option will put user-space page table | |
1074 | entries in high memory. | |
1075 | ||
1076 | config MATH_EMULATION | |
1077 | bool | |
1078 | prompt "Math emulation" if X86_32 | |
1079 | ---help--- | |
1080 | Linux can emulate a math coprocessor (used for floating point | |
1081 | operations) if you don't have one. 486DX and Pentium processors have | |
1082 | a math coprocessor built in, 486SX and 386 do not, unless you added | |
1083 | a 487DX or 387, respectively. (The messages during boot time can | |
1084 | give you some hints here ["man dmesg"].) Everyone needs either a | |
1085 | coprocessor or this emulation. | |
1086 | ||
1087 | If you don't have a math coprocessor, you need to say Y here; if you | |
1088 | say Y here even though you have a coprocessor, the coprocessor will | |
1089 | be used nevertheless. (This behavior can be changed with the kernel | |
1090 | command line option "no387", which comes handy if your coprocessor | |
1091 | is broken. Try "man bootparam" or see the documentation of your boot | |
1092 | loader (lilo or loadlin) about how to pass options to the kernel at | |
1093 | boot time.) This means that it is a good idea to say Y here if you | |
1094 | intend to use this kernel on different machines. | |
1095 | ||
1096 | More information about the internals of the Linux math coprocessor | |
1097 | emulation can be found in <file:arch/x86/math-emu/README>. | |
1098 | ||
1099 | If you are not sure, say Y; apart from resulting in a 66 KB bigger | |
1100 | kernel, it won't hurt. | |
1101 | ||
1102 | config MTRR | |
1103 | bool "MTRR (Memory Type Range Register) support" | |
1104 | ---help--- | |
1105 | On Intel P6 family processors (Pentium Pro, Pentium II and later) | |
1106 | the Memory Type Range Registers (MTRRs) may be used to control | |
1107 | processor access to memory ranges. This is most useful if you have | |
1108 | a video (VGA) card on a PCI or AGP bus. Enabling write-combining | |
1109 | allows bus write transfers to be combined into a larger transfer | |
1110 | before bursting over the PCI/AGP bus. This can increase performance | |
1111 | of image write operations 2.5 times or more. Saying Y here creates a | |
1112 | /proc/mtrr file which may be used to manipulate your processor's | |
1113 | MTRRs. Typically the X server should use this. | |
1114 | ||
1115 | This code has a reasonably generic interface so that similar | |
1116 | control registers on other processors can be easily supported | |
1117 | as well: | |
1118 | ||
1119 | The Cyrix 6x86, 6x86MX and M II processors have Address Range | |
1120 | Registers (ARRs) which provide a similar functionality to MTRRs. For | |
1121 | these, the ARRs are used to emulate the MTRRs. | |
1122 | The AMD K6-2 (stepping 8 and above) and K6-3 processors have two | |
1123 | MTRRs. The Centaur C6 (WinChip) has 8 MCRs, allowing | |
1124 | write-combining. All of these processors are supported by this code | |
1125 | and it makes sense to say Y here if you have one of them. | |
1126 | ||
1127 | Saying Y here also fixes a problem with buggy SMP BIOSes which only | |
1128 | set the MTRRs for the boot CPU and not for the secondary CPUs. This | |
1129 | can lead to all sorts of problems, so it's good to say Y here. | |
1130 | ||
1131 | You can safely say Y even if your machine doesn't have MTRRs, you'll | |
1132 | just add about 9 KB to your kernel. | |
1133 | ||
1134 | See <file:Documentation/mtrr.txt> for more information. | |
1135 | ||
95ffa243 | 1136 | config MTRR_SANITIZER |
aba3728c | 1137 | bool |
95ffa243 YL |
1138 | prompt "MTRR cleanup support" |
1139 | depends on MTRR | |
1140 | help | |
aba3728c TG |
1141 | Convert MTRR layout from continuous to discrete, so X drivers can |
1142 | add writeback entries. | |
95ffa243 | 1143 | |
aba3728c TG |
1144 | Can be disabled with disable_mtrr_cleanup on the kernel command line. |
1145 | The largest mtrr entry size for a continous block can be set with | |
1146 | mtrr_chunk_size. | |
95ffa243 | 1147 | |
aba3728c | 1148 | If unsure, say N. |
95ffa243 YL |
1149 | |
1150 | config MTRR_SANITIZER_ENABLE_DEFAULT | |
f5098d62 YL |
1151 | int "MTRR cleanup enable value (0-1)" |
1152 | range 0 1 | |
1153 | default "0" | |
95ffa243 YL |
1154 | depends on MTRR_SANITIZER |
1155 | help | |
f5098d62 | 1156 | Enable mtrr cleanup default value |
95ffa243 | 1157 | |
12031a62 YL |
1158 | config MTRR_SANITIZER_SPARE_REG_NR_DEFAULT |
1159 | int "MTRR cleanup spare reg num (0-7)" | |
1160 | range 0 7 | |
1161 | default "1" | |
1162 | depends on MTRR_SANITIZER | |
1163 | help | |
1164 | mtrr cleanup spare entries default, it can be changed via | |
aba3728c | 1165 | mtrr_spare_reg_nr=N on the kernel command line. |
12031a62 | 1166 | |
2e5d9c85 | 1167 | config X86_PAT |
2a8a2719 | 1168 | bool |
2e5d9c85 | 1169 | prompt "x86 PAT support" |
2a8a2719 | 1170 | depends on MTRR |
2e5d9c85 | 1171 | help |
1172 | Use PAT attributes to setup page level cache control. | |
042b78e4 | 1173 | |
2e5d9c85 | 1174 | PATs are the modern equivalents of MTRRs and are much more |
1175 | flexible than MTRRs. | |
1176 | ||
1177 | Say N here if you see bootup problems (boot crash, boot hang, | |
042b78e4 | 1178 | spontaneous reboots) or a non-working video driver. |
2e5d9c85 | 1179 | |
1180 | If unsure, say Y. | |
1181 | ||
506f1d07 | 1182 | config EFI |
3c2362e6 | 1183 | def_bool n |
8b2cb7a8 | 1184 | prompt "EFI runtime service support" |
5b83683f | 1185 | depends on ACPI |
506f1d07 | 1186 | ---help--- |
8b2cb7a8 | 1187 | This enables the kernel to use EFI runtime services that are |
506f1d07 SR |
1188 | available (such as the EFI variable services). |
1189 | ||
8b2cb7a8 HY |
1190 | This option is only useful on systems that have EFI firmware. |
1191 | In addition, you should use the latest ELILO loader available | |
1192 | at <http://elilo.sourceforge.net> in order to take advantage | |
1193 | of EFI runtime services. However, even with this option, the | |
1194 | resultant kernel should continue to boot on existing non-EFI | |
1195 | platforms. | |
506f1d07 SR |
1196 | |
1197 | config IRQBALANCE | |
3c2362e6 HH |
1198 | def_bool y |
1199 | prompt "Enable kernel irq balancing" | |
506f1d07 | 1200 | depends on X86_32 && SMP && X86_IO_APIC |
506f1d07 SR |
1201 | help |
1202 | The default yes will allow the kernel to do irq load balancing. | |
1203 | Saying no will keep the kernel from doing irq load balancing. | |
1204 | ||
506f1d07 | 1205 | config SECCOMP |
3c2362e6 HH |
1206 | def_bool y |
1207 | prompt "Enable seccomp to safely compute untrusted bytecode" | |
506f1d07 | 1208 | depends on PROC_FS |
506f1d07 SR |
1209 | help |
1210 | This kernel feature is useful for number crunching applications | |
1211 | that may need to compute untrusted bytecode during their | |
1212 | execution. By using pipes or other transports made available to | |
1213 | the process as file descriptors supporting the read/write | |
1214 | syscalls, it's possible to isolate those applications in | |
1215 | their own address space using seccomp. Once seccomp is | |
1216 | enabled via /proc/<pid>/seccomp, it cannot be disabled | |
1217 | and the task is only allowed to execute a few safe syscalls | |
1218 | defined by each seccomp mode. | |
1219 | ||
1220 | If unsure, say Y. Only embedded should say N here. | |
1221 | ||
1222 | config CC_STACKPROTECTOR | |
1223 | bool "Enable -fstack-protector buffer overflow detection (EXPERIMENTAL)" | |
2c020a99 | 1224 | depends on X86_64 && EXPERIMENTAL && BROKEN |
506f1d07 SR |
1225 | help |
1226 | This option turns on the -fstack-protector GCC feature. This | |
1227 | feature puts, at the beginning of critical functions, a canary | |
1228 | value on the stack just before the return address, and validates | |
1229 | the value just before actually returning. Stack based buffer | |
1230 | overflows (that need to overwrite this return address) now also | |
1231 | overwrite the canary, which gets detected and the attack is then | |
1232 | neutralized via a kernel panic. | |
1233 | ||
1234 | This feature requires gcc version 4.2 or above, or a distribution | |
1235 | gcc with the feature backported. Older versions are automatically | |
1236 | detected and for those versions, this configuration option is ignored. | |
1237 | ||
1238 | config CC_STACKPROTECTOR_ALL | |
1239 | bool "Use stack-protector for all functions" | |
1240 | depends on CC_STACKPROTECTOR | |
1241 | help | |
1242 | Normally, GCC only inserts the canary value protection for | |
1243 | functions that use large-ish on-stack buffers. By enabling | |
1244 | this option, GCC will be asked to do this for ALL functions. | |
1245 | ||
1246 | source kernel/Kconfig.hz | |
1247 | ||
1248 | config KEXEC | |
1249 | bool "kexec system call" | |
3e8f7e35 | 1250 | depends on X86_BIOS_REBOOT |
506f1d07 SR |
1251 | help |
1252 | kexec is a system call that implements the ability to shutdown your | |
1253 | current kernel, and to start another kernel. It is like a reboot | |
1254 | but it is independent of the system firmware. And like a reboot | |
1255 | you can start any kernel with it, not just Linux. | |
1256 | ||
1257 | The name comes from the similarity to the exec system call. | |
1258 | ||
1259 | It is an ongoing process to be certain the hardware in a machine | |
1260 | is properly shutdown, so do not be surprised if this code does not | |
1261 | initially work for you. It may help to enable device hotplugging | |
1262 | support. As of this writing the exact hardware interface is | |
1263 | strongly in flux, so no good recommendation can be made. | |
1264 | ||
1265 | config CRASH_DUMP | |
1266 | bool "kernel crash dumps (EXPERIMENTAL)" | |
506f1d07 SR |
1267 | depends on X86_64 || (X86_32 && HIGHMEM) |
1268 | help | |
1269 | Generate crash dump after being started by kexec. | |
1270 | This should be normally only set in special crash dump kernels | |
1271 | which are loaded in the main kernel with kexec-tools into | |
1272 | a specially reserved region and then later executed after | |
1273 | a crash by kdump/kexec. The crash dump kernel must be compiled | |
1274 | to a memory address not used by the main kernel or BIOS using | |
1275 | PHYSICAL_START, or it must be built as a relocatable image | |
1276 | (CONFIG_RELOCATABLE=y). | |
1277 | For more details see Documentation/kdump/kdump.txt | |
1278 | ||
3ab83521 HY |
1279 | config KEXEC_JUMP |
1280 | bool "kexec jump (EXPERIMENTAL)" | |
1281 | depends on EXPERIMENTAL | |
89081d17 | 1282 | depends on KEXEC && HIBERNATION && X86_32 |
3ab83521 | 1283 | help |
89081d17 HY |
1284 | Jump between original kernel and kexeced kernel and invoke |
1285 | code in physical address mode via KEXEC | |
3ab83521 | 1286 | |
506f1d07 SR |
1287 | config PHYSICAL_START |
1288 | hex "Physical address where the kernel is loaded" if (EMBEDDED || CRASH_DUMP) | |
1289 | default "0x1000000" if X86_NUMAQ | |
1290 | default "0x200000" if X86_64 | |
1291 | default "0x100000" | |
1292 | help | |
1293 | This gives the physical address where the kernel is loaded. | |
1294 | ||
1295 | If kernel is a not relocatable (CONFIG_RELOCATABLE=n) then | |
1296 | bzImage will decompress itself to above physical address and | |
1297 | run from there. Otherwise, bzImage will run from the address where | |
1298 | it has been loaded by the boot loader and will ignore above physical | |
1299 | address. | |
1300 | ||
1301 | In normal kdump cases one does not have to set/change this option | |
1302 | as now bzImage can be compiled as a completely relocatable image | |
1303 | (CONFIG_RELOCATABLE=y) and be used to load and run from a different | |
1304 | address. This option is mainly useful for the folks who don't want | |
1305 | to use a bzImage for capturing the crash dump and want to use a | |
1306 | vmlinux instead. vmlinux is not relocatable hence a kernel needs | |
1307 | to be specifically compiled to run from a specific memory area | |
1308 | (normally a reserved region) and this option comes handy. | |
1309 | ||
1310 | So if you are using bzImage for capturing the crash dump, leave | |
1311 | the value here unchanged to 0x100000 and set CONFIG_RELOCATABLE=y. | |
1312 | Otherwise if you plan to use vmlinux for capturing the crash dump | |
1313 | change this value to start of the reserved region (Typically 16MB | |
1314 | 0x1000000). In other words, it can be set based on the "X" value as | |
1315 | specified in the "crashkernel=YM@XM" command line boot parameter | |
1316 | passed to the panic-ed kernel. Typically this parameter is set as | |
1317 | crashkernel=64M@16M. Please take a look at | |
1318 | Documentation/kdump/kdump.txt for more details about crash dumps. | |
1319 | ||
1320 | Usage of bzImage for capturing the crash dump is recommended as | |
1321 | one does not have to build two kernels. Same kernel can be used | |
1322 | as production kernel and capture kernel. Above option should have | |
1323 | gone away after relocatable bzImage support is introduced. But it | |
1324 | is present because there are users out there who continue to use | |
1325 | vmlinux for dump capture. This option should go away down the | |
1326 | line. | |
1327 | ||
1328 | Don't change this unless you know what you are doing. | |
1329 | ||
1330 | config RELOCATABLE | |
1331 | bool "Build a relocatable kernel (EXPERIMENTAL)" | |
1332 | depends on EXPERIMENTAL | |
1333 | help | |
1334 | This builds a kernel image that retains relocation information | |
1335 | so it can be loaded someplace besides the default 1MB. | |
1336 | The relocations tend to make the kernel binary about 10% larger, | |
1337 | but are discarded at runtime. | |
1338 | ||
1339 | One use is for the kexec on panic case where the recovery kernel | |
1340 | must live at a different physical address than the primary | |
1341 | kernel. | |
1342 | ||
1343 | Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address | |
1344 | it has been loaded at and the compile time physical address | |
1345 | (CONFIG_PHYSICAL_START) is ignored. | |
1346 | ||
1347 | config PHYSICAL_ALIGN | |
1348 | hex | |
1349 | prompt "Alignment value to which kernel should be aligned" if X86_32 | |
1350 | default "0x100000" if X86_32 | |
1351 | default "0x200000" if X86_64 | |
1352 | range 0x2000 0x400000 | |
1353 | help | |
1354 | This value puts the alignment restrictions on physical address | |
1355 | where kernel is loaded and run from. Kernel is compiled for an | |
1356 | address which meets above alignment restriction. | |
1357 | ||
1358 | If bootloader loads the kernel at a non-aligned address and | |
1359 | CONFIG_RELOCATABLE is set, kernel will move itself to nearest | |
1360 | address aligned to above value and run from there. | |
1361 | ||
1362 | If bootloader loads the kernel at a non-aligned address and | |
1363 | CONFIG_RELOCATABLE is not set, kernel will ignore the run time | |
1364 | load address and decompress itself to the address it has been | |
1365 | compiled for and run from there. The address for which kernel is | |
1366 | compiled already meets above alignment restrictions. Hence the | |
1367 | end result is that kernel runs from a physical address meeting | |
1368 | above alignment restrictions. | |
1369 | ||
1370 | Don't change this unless you know what you are doing. | |
1371 | ||
1372 | config HOTPLUG_CPU | |
1373 | bool "Support for suspend on SMP and hot-pluggable CPUs (EXPERIMENTAL)" | |
1374 | depends on SMP && HOTPLUG && EXPERIMENTAL && !X86_VOYAGER | |
1375 | ---help--- | |
1376 | Say Y here to experiment with turning CPUs off and on, and to | |
1377 | enable suspend on SMP systems. CPUs can be controlled through | |
1378 | /sys/devices/system/cpu. | |
1379 | Say N if you want to disable CPU hotplug and don't need to | |
1380 | suspend. | |
1381 | ||
1382 | config COMPAT_VDSO | |
3c2362e6 HH |
1383 | def_bool y |
1384 | prompt "Compat VDSO support" | |
af65d648 | 1385 | depends on X86_32 || IA32_EMULATION |
506f1d07 | 1386 | help |
af65d648 | 1387 | Map the 32-bit VDSO to the predictable old-style address too. |
506f1d07 SR |
1388 | ---help--- |
1389 | Say N here if you are running a sufficiently recent glibc | |
1390 | version (2.3.3 or later), to remove the high-mapped | |
1391 | VDSO mapping and to exclusively use the randomized VDSO. | |
1392 | ||
1393 | If unsure, say Y. | |
1394 | ||
1395 | endmenu | |
1396 | ||
1397 | config ARCH_ENABLE_MEMORY_HOTPLUG | |
1398 | def_bool y | |
1399 | depends on X86_64 || (X86_32 && HIGHMEM) | |
1400 | ||
506f1d07 SR |
1401 | config HAVE_ARCH_EARLY_PFN_TO_NID |
1402 | def_bool X86_64 | |
1403 | depends on NUMA | |
1404 | ||
e279b6c1 SR |
1405 | menu "Power management options" |
1406 | depends on !X86_VOYAGER | |
1407 | ||
1408 | config ARCH_HIBERNATION_HEADER | |
3c2362e6 | 1409 | def_bool y |
e279b6c1 | 1410 | depends on X86_64 && HIBERNATION |
e279b6c1 SR |
1411 | |
1412 | source "kernel/power/Kconfig" | |
1413 | ||
1414 | source "drivers/acpi/Kconfig" | |
1415 | ||
a6b68076 AK |
1416 | config X86_APM_BOOT |
1417 | bool | |
1418 | default y | |
1419 | depends on APM || APM_MODULE | |
1420 | ||
e279b6c1 SR |
1421 | menuconfig APM |
1422 | tristate "APM (Advanced Power Management) BIOS support" | |
efefa6f6 | 1423 | depends on X86_32 && PM_SLEEP |
e279b6c1 SR |
1424 | ---help--- |
1425 | APM is a BIOS specification for saving power using several different | |
1426 | techniques. This is mostly useful for battery powered laptops with | |
1427 | APM compliant BIOSes. If you say Y here, the system time will be | |
1428 | reset after a RESUME operation, the /proc/apm device will provide | |
1429 | battery status information, and user-space programs will receive | |
1430 | notification of APM "events" (e.g. battery status change). | |
1431 | ||
1432 | If you select "Y" here, you can disable actual use of the APM | |
1433 | BIOS by passing the "apm=off" option to the kernel at boot time. | |
1434 | ||
1435 | Note that the APM support is almost completely disabled for | |
1436 | machines with more than one CPU. | |
1437 | ||
1438 | In order to use APM, you will need supporting software. For location | |
53471121 | 1439 | and more information, read <file:Documentation/power/pm.txt> and the |
e279b6c1 SR |
1440 | Battery Powered Linux mini-HOWTO, available from |
1441 | <http://www.tldp.org/docs.html#howto>. | |
1442 | ||
1443 | This driver does not spin down disk drives (see the hdparm(8) | |
1444 | manpage ("man 8 hdparm") for that), and it doesn't turn off | |
1445 | VESA-compliant "green" monitors. | |
1446 | ||
1447 | This driver does not support the TI 4000M TravelMate and the ACER | |
1448 | 486/DX4/75 because they don't have compliant BIOSes. Many "green" | |
1449 | desktop machines also don't have compliant BIOSes, and this driver | |
1450 | may cause those machines to panic during the boot phase. | |
1451 | ||
1452 | Generally, if you don't have a battery in your machine, there isn't | |
1453 | much point in using this driver and you should say N. If you get | |
1454 | random kernel OOPSes or reboots that don't seem to be related to | |
1455 | anything, try disabling/enabling this option (or disabling/enabling | |
1456 | APM in your BIOS). | |
1457 | ||
1458 | Some other things you should try when experiencing seemingly random, | |
1459 | "weird" problems: | |
1460 | ||
1461 | 1) make sure that you have enough swap space and that it is | |
1462 | enabled. | |
1463 | 2) pass the "no-hlt" option to the kernel | |
1464 | 3) switch on floating point emulation in the kernel and pass | |
1465 | the "no387" option to the kernel | |
1466 | 4) pass the "floppy=nodma" option to the kernel | |
1467 | 5) pass the "mem=4M" option to the kernel (thereby disabling | |
1468 | all but the first 4 MB of RAM) | |
1469 | 6) make sure that the CPU is not over clocked. | |
1470 | 7) read the sig11 FAQ at <http://www.bitwizard.nl/sig11/> | |
1471 | 8) disable the cache from your BIOS settings | |
1472 | 9) install a fan for the video card or exchange video RAM | |
1473 | 10) install a better fan for the CPU | |
1474 | 11) exchange RAM chips | |
1475 | 12) exchange the motherboard. | |
1476 | ||
1477 | To compile this driver as a module, choose M here: the | |
1478 | module will be called apm. | |
1479 | ||
1480 | if APM | |
1481 | ||
1482 | config APM_IGNORE_USER_SUSPEND | |
1483 | bool "Ignore USER SUSPEND" | |
1484 | help | |
1485 | This option will ignore USER SUSPEND requests. On machines with a | |
1486 | compliant APM BIOS, you want to say N. However, on the NEC Versa M | |
1487 | series notebooks, it is necessary to say Y because of a BIOS bug. | |
1488 | ||
1489 | config APM_DO_ENABLE | |
1490 | bool "Enable PM at boot time" | |
1491 | ---help--- | |
1492 | Enable APM features at boot time. From page 36 of the APM BIOS | |
1493 | specification: "When disabled, the APM BIOS does not automatically | |
1494 | power manage devices, enter the Standby State, enter the Suspend | |
1495 | State, or take power saving steps in response to CPU Idle calls." | |
1496 | This driver will make CPU Idle calls when Linux is idle (unless this | |
1497 | feature is turned off -- see "Do CPU IDLE calls", below). This | |
1498 | should always save battery power, but more complicated APM features | |
1499 | will be dependent on your BIOS implementation. You may need to turn | |
1500 | this option off if your computer hangs at boot time when using APM | |
1501 | support, or if it beeps continuously instead of suspending. Turn | |
1502 | this off if you have a NEC UltraLite Versa 33/C or a Toshiba | |
1503 | T400CDT. This is off by default since most machines do fine without | |
1504 | this feature. | |
1505 | ||
1506 | config APM_CPU_IDLE | |
1507 | bool "Make CPU Idle calls when idle" | |
1508 | help | |
1509 | Enable calls to APM CPU Idle/CPU Busy inside the kernel's idle loop. | |
1510 | On some machines, this can activate improved power savings, such as | |
1511 | a slowed CPU clock rate, when the machine is idle. These idle calls | |
1512 | are made after the idle loop has run for some length of time (e.g., | |
1513 | 333 mS). On some machines, this will cause a hang at boot time or | |
1514 | whenever the CPU becomes idle. (On machines with more than one CPU, | |
1515 | this option does nothing.) | |
1516 | ||
1517 | config APM_DISPLAY_BLANK | |
1518 | bool "Enable console blanking using APM" | |
1519 | help | |
1520 | Enable console blanking using the APM. Some laptops can use this to | |
1521 | turn off the LCD backlight when the screen blanker of the Linux | |
1522 | virtual console blanks the screen. Note that this is only used by | |
1523 | the virtual console screen blanker, and won't turn off the backlight | |
1524 | when using the X Window system. This also doesn't have anything to | |
1525 | do with your VESA-compliant power-saving monitor. Further, this | |
1526 | option doesn't work for all laptops -- it might not turn off your | |
1527 | backlight at all, or it might print a lot of errors to the console, | |
1528 | especially if you are using gpm. | |
1529 | ||
1530 | config APM_ALLOW_INTS | |
1531 | bool "Allow interrupts during APM BIOS calls" | |
1532 | help | |
1533 | Normally we disable external interrupts while we are making calls to | |
1534 | the APM BIOS as a measure to lessen the effects of a badly behaving | |
1535 | BIOS implementation. The BIOS should reenable interrupts if it | |
1536 | needs to. Unfortunately, some BIOSes do not -- especially those in | |
1537 | many of the newer IBM Thinkpads. If you experience hangs when you | |
1538 | suspend, try setting this to Y. Otherwise, say N. | |
1539 | ||
1540 | config APM_REAL_MODE_POWER_OFF | |
1541 | bool "Use real mode APM BIOS call to power off" | |
1542 | help | |
1543 | Use real mode APM BIOS calls to switch off the computer. This is | |
1544 | a work-around for a number of buggy BIOSes. Switch this option on if | |
1545 | your computer crashes instead of powering off properly. | |
1546 | ||
1547 | endif # APM | |
1548 | ||
1549 | source "arch/x86/kernel/cpu/cpufreq/Kconfig" | |
1550 | ||
1551 | source "drivers/cpuidle/Kconfig" | |
1552 | ||
1553 | endmenu | |
1554 | ||
1555 | ||
1556 | menu "Bus options (PCI etc.)" | |
1557 | ||
1558 | config PCI | |
1ac97018 | 1559 | bool "PCI support" |
1c858087 | 1560 | default y |
e279b6c1 SR |
1561 | select ARCH_SUPPORTS_MSI if (X86_LOCAL_APIC && X86_IO_APIC) |
1562 | help | |
1563 | Find out whether you have a PCI motherboard. PCI is the name of a | |
1564 | bus system, i.e. the way the CPU talks to the other stuff inside | |
1565 | your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or | |
1566 | VESA. If you have PCI, say Y, otherwise N. | |
1567 | ||
e279b6c1 SR |
1568 | choice |
1569 | prompt "PCI access mode" | |
efefa6f6 | 1570 | depends on X86_32 && PCI |
e279b6c1 SR |
1571 | default PCI_GOANY |
1572 | ---help--- | |
1573 | On PCI systems, the BIOS can be used to detect the PCI devices and | |
1574 | determine their configuration. However, some old PCI motherboards | |
1575 | have BIOS bugs and may crash if this is done. Also, some embedded | |
1576 | PCI-based systems don't have any BIOS at all. Linux can also try to | |
1577 | detect the PCI hardware directly without using the BIOS. | |
1578 | ||
1579 | With this option, you can specify how Linux should detect the | |
1580 | PCI devices. If you choose "BIOS", the BIOS will be used, | |
1581 | if you choose "Direct", the BIOS won't be used, and if you | |
1582 | choose "MMConfig", then PCI Express MMCONFIG will be used. | |
1583 | If you choose "Any", the kernel will try MMCONFIG, then the | |
1584 | direct access method and falls back to the BIOS if that doesn't | |
1585 | work. If unsure, go with the default, which is "Any". | |
1586 | ||
1587 | config PCI_GOBIOS | |
1588 | bool "BIOS" | |
1589 | ||
1590 | config PCI_GOMMCONFIG | |
1591 | bool "MMConfig" | |
1592 | ||
1593 | config PCI_GODIRECT | |
1594 | bool "Direct" | |
1595 | ||
3ef0e1f8 AS |
1596 | config PCI_GOOLPC |
1597 | bool "OLPC" | |
1598 | depends on OLPC | |
1599 | ||
2bdd1b03 AS |
1600 | config PCI_GOANY |
1601 | bool "Any" | |
1602 | ||
e279b6c1 SR |
1603 | endchoice |
1604 | ||
1605 | config PCI_BIOS | |
3c2362e6 | 1606 | def_bool y |
efefa6f6 | 1607 | depends on X86_32 && PCI && (PCI_GOBIOS || PCI_GOANY) |
e279b6c1 SR |
1608 | |
1609 | # x86-64 doesn't support PCI BIOS access from long mode so always go direct. | |
1610 | config PCI_DIRECT | |
3c2362e6 | 1611 | def_bool y |
efefa6f6 | 1612 | depends on PCI && (X86_64 || (PCI_GODIRECT || PCI_GOANY || PCI_GOOLPC)) |
e279b6c1 SR |
1613 | |
1614 | config PCI_MMCONFIG | |
3c2362e6 | 1615 | def_bool y |
e279b6c1 | 1616 | depends on X86_32 && PCI && ACPI && (PCI_GOMMCONFIG || PCI_GOANY) |
e279b6c1 | 1617 | |
3ef0e1f8 | 1618 | config PCI_OLPC |
2bdd1b03 AS |
1619 | def_bool y |
1620 | depends on PCI && OLPC && (PCI_GOOLPC || PCI_GOANY) | |
3ef0e1f8 | 1621 | |
e279b6c1 | 1622 | config PCI_DOMAINS |
3c2362e6 | 1623 | def_bool y |
e279b6c1 | 1624 | depends on PCI |
e279b6c1 SR |
1625 | |
1626 | config PCI_MMCONFIG | |
1627 | bool "Support mmconfig PCI config space access" | |
1628 | depends on X86_64 && PCI && ACPI | |
1629 | ||
1630 | config DMAR | |
1631 | bool "Support for DMA Remapping Devices (EXPERIMENTAL)" | |
1632 | depends on X86_64 && PCI_MSI && ACPI && EXPERIMENTAL | |
1633 | help | |
1634 | DMA remapping (DMAR) devices support enables independent address | |
1635 | translations for Direct Memory Access (DMA) from devices. | |
1636 | These DMA remapping devices are reported via ACPI tables | |
1637 | and include PCI device scope covered by these DMA | |
1638 | remapping devices. | |
1639 | ||
1640 | config DMAR_GFX_WA | |
3c2362e6 HH |
1641 | def_bool y |
1642 | prompt "Support for Graphics workaround" | |
e279b6c1 | 1643 | depends on DMAR |
e279b6c1 SR |
1644 | help |
1645 | Current Graphics drivers tend to use physical address | |
1646 | for DMA and avoid using DMA APIs. Setting this config | |
1647 | option permits the IOMMU driver to set a unity map for | |
1648 | all the OS-visible memory. Hence the driver can continue | |
1649 | to use physical addresses for DMA. | |
1650 | ||
1651 | config DMAR_FLOPPY_WA | |
3c2362e6 | 1652 | def_bool y |
e279b6c1 | 1653 | depends on DMAR |
e279b6c1 SR |
1654 | help |
1655 | Floppy disk drivers are know to bypass DMA API calls | |
1656 | thereby failing to work when IOMMU is enabled. This | |
1657 | workaround will setup a 1:1 mapping for the first | |
1658 | 16M to make floppy (an ISA device) work. | |
1659 | ||
1660 | source "drivers/pci/pcie/Kconfig" | |
1661 | ||
1662 | source "drivers/pci/Kconfig" | |
1663 | ||
1664 | # x86_64 have no ISA slots, but do have ISA-style DMA. | |
1665 | config ISA_DMA_API | |
3c2362e6 | 1666 | def_bool y |
e279b6c1 SR |
1667 | |
1668 | if X86_32 | |
1669 | ||
1670 | config ISA | |
1671 | bool "ISA support" | |
efefa6f6 | 1672 | depends on !X86_VOYAGER |
e279b6c1 SR |
1673 | help |
1674 | Find out whether you have ISA slots on your motherboard. ISA is the | |
1675 | name of a bus system, i.e. the way the CPU talks to the other stuff | |
1676 | inside your box. Other bus systems are PCI, EISA, MicroChannel | |
1677 | (MCA) or VESA. ISA is an older system, now being displaced by PCI; | |
1678 | newer boards don't support it. If you have ISA, say Y, otherwise N. | |
1679 | ||
1680 | config EISA | |
1681 | bool "EISA support" | |
1682 | depends on ISA | |
1683 | ---help--- | |
1684 | The Extended Industry Standard Architecture (EISA) bus was | |
1685 | developed as an open alternative to the IBM MicroChannel bus. | |
1686 | ||
1687 | The EISA bus provided some of the features of the IBM MicroChannel | |
1688 | bus while maintaining backward compatibility with cards made for | |
1689 | the older ISA bus. The EISA bus saw limited use between 1988 and | |
1690 | 1995 when it was made obsolete by the PCI bus. | |
1691 | ||
1692 | Say Y here if you are building a kernel for an EISA-based machine. | |
1693 | ||
1694 | Otherwise, say N. | |
1695 | ||
1696 | source "drivers/eisa/Kconfig" | |
1697 | ||
1698 | config MCA | |
efefa6f6 | 1699 | bool "MCA support" if !X86_VOYAGER |
e279b6c1 SR |
1700 | default y if X86_VOYAGER |
1701 | help | |
1702 | MicroChannel Architecture is found in some IBM PS/2 machines and | |
1703 | laptops. It is a bus system similar to PCI or ISA. See | |
1704 | <file:Documentation/mca.txt> (and especially the web page given | |
1705 | there) before attempting to build an MCA bus kernel. | |
1706 | ||
1707 | source "drivers/mca/Kconfig" | |
1708 | ||
1709 | config SCx200 | |
1710 | tristate "NatSemi SCx200 support" | |
1711 | depends on !X86_VOYAGER | |
1712 | help | |
1713 | This provides basic support for National Semiconductor's | |
1714 | (now AMD's) Geode processors. The driver probes for the | |
1715 | PCI-IDs of several on-chip devices, so its a good dependency | |
1716 | for other scx200_* drivers. | |
1717 | ||
1718 | If compiled as a module, the driver is named scx200. | |
1719 | ||
1720 | config SCx200HR_TIMER | |
1721 | tristate "NatSemi SCx200 27MHz High-Resolution Timer Support" | |
1722 | depends on SCx200 && GENERIC_TIME | |
1723 | default y | |
1724 | help | |
1725 | This driver provides a clocksource built upon the on-chip | |
1726 | 27MHz high-resolution timer. Its also a workaround for | |
1727 | NSC Geode SC-1100's buggy TSC, which loses time when the | |
1728 | processor goes idle (as is done by the scheduler). The | |
1729 | other workaround is idle=poll boot option. | |
1730 | ||
1731 | config GEODE_MFGPT_TIMER | |
3c2362e6 HH |
1732 | def_bool y |
1733 | prompt "Geode Multi-Function General Purpose Timer (MFGPT) events" | |
e279b6c1 | 1734 | depends on MGEODE_LX && GENERIC_TIME && GENERIC_CLOCKEVENTS |
e279b6c1 SR |
1735 | help |
1736 | This driver provides a clock event source based on the MFGPT | |
1737 | timer(s) in the CS5535 and CS5536 companion chip for the geode. | |
1738 | MFGPTs have a better resolution and max interval than the | |
1739 | generic PIT, and are suitable for use as high-res timers. | |
1740 | ||
3ef0e1f8 AS |
1741 | config OLPC |
1742 | bool "One Laptop Per Child support" | |
1743 | default n | |
1744 | help | |
1745 | Add support for detecting the unique features of the OLPC | |
1746 | XO hardware. | |
1747 | ||
bc0120fd SR |
1748 | endif # X86_32 |
1749 | ||
e279b6c1 SR |
1750 | config K8_NB |
1751 | def_bool y | |
bc0120fd | 1752 | depends on AGP_AMD64 || (X86_64 && (GART_IOMMU || (PCI && NUMA))) |
e279b6c1 SR |
1753 | |
1754 | source "drivers/pcmcia/Kconfig" | |
1755 | ||
1756 | source "drivers/pci/hotplug/Kconfig" | |
1757 | ||
1758 | endmenu | |
1759 | ||
1760 | ||
1761 | menu "Executable file formats / Emulations" | |
1762 | ||
1763 | source "fs/Kconfig.binfmt" | |
1764 | ||
1765 | config IA32_EMULATION | |
1766 | bool "IA32 Emulation" | |
1767 | depends on X86_64 | |
a97f52e6 | 1768 | select COMPAT_BINFMT_ELF |
e279b6c1 SR |
1769 | help |
1770 | Include code to run 32-bit programs under a 64-bit kernel. You should | |
1771 | likely turn this on, unless you're 100% sure that you don't have any | |
1772 | 32-bit programs left. | |
1773 | ||
1774 | config IA32_AOUT | |
1775 | tristate "IA32 a.out support" | |
b0b933c0 | 1776 | depends on IA32_EMULATION && ARCH_SUPPORTS_AOUT |
e279b6c1 SR |
1777 | help |
1778 | Support old a.out binaries in the 32bit emulation. | |
1779 | ||
1780 | config COMPAT | |
3c2362e6 | 1781 | def_bool y |
e279b6c1 | 1782 | depends on IA32_EMULATION |
e279b6c1 SR |
1783 | |
1784 | config COMPAT_FOR_U64_ALIGNMENT | |
1785 | def_bool COMPAT | |
1786 | depends on X86_64 | |
1787 | ||
1788 | config SYSVIPC_COMPAT | |
3c2362e6 | 1789 | def_bool y |
e279b6c1 | 1790 | depends on X86_64 && COMPAT && SYSVIPC |
e279b6c1 SR |
1791 | |
1792 | endmenu | |
1793 | ||
1794 | ||
1795 | source "net/Kconfig" | |
1796 | ||
1797 | source "drivers/Kconfig" | |
1798 | ||
1799 | source "drivers/firmware/Kconfig" | |
1800 | ||
1801 | source "fs/Kconfig" | |
1802 | ||
e279b6c1 SR |
1803 | source "arch/x86/Kconfig.debug" |
1804 | ||
1805 | source "security/Kconfig" | |
1806 | ||
1807 | source "crypto/Kconfig" | |
1808 | ||
edf88417 AK |
1809 | source "arch/x86/kvm/Kconfig" |
1810 | ||
e279b6c1 | 1811 | source "lib/Kconfig" |