diff options
author | Sam Ravnborg <sam@ravnborg.org> | 2007-11-09 15:56:54 -0500 |
---|---|---|
committer | Sam Ravnborg <sam@ravnborg.org> | 2007-11-12 15:02:19 -0500 |
commit | 506f1d07b310815d11527d3360b09d79d0bd59f1 (patch) | |
tree | 3a2b1a7699916c0c9518db84d3cc060301ef5b81 /arch/x86/Kconfig.i386 | |
parent | 8d5fffb928cd86a70823f66f8335fa41709ec109 (diff) |
x86: move the rest of the menu's to Kconfig
With this patch we have all the Kconfig file shared
between i386 and x86_64.
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Diffstat (limited to 'arch/x86/Kconfig.i386')
-rw-r--r-- | arch/x86/Kconfig.i386 | 1053 |
1 files changed, 0 insertions, 1053 deletions
diff --git a/arch/x86/Kconfig.i386 b/arch/x86/Kconfig.i386 index b8b462a91dc7..7b8dc2604d57 100644 --- a/arch/x86/Kconfig.i386 +++ b/arch/x86/Kconfig.i386 | |||
@@ -14,1058 +14,5 @@ config X86_32 | |||
14 | 486, 586, Pentiums, and various instruction-set-compatible chips by | 14 | 486, 586, Pentiums, and various instruction-set-compatible chips by |
15 | AMD, Cyrix, and others. | 15 | AMD, Cyrix, and others. |
16 | 16 | ||
17 | source "init/Kconfig" | ||
18 | |||
19 | menu "Processor type and features" | ||
20 | |||
21 | source "kernel/time/Kconfig" | ||
22 | |||
23 | config SMP | ||
24 | bool "Symmetric multi-processing support" | ||
25 | ---help--- | ||
26 | This enables support for systems with more than one CPU. If you have | ||
27 | a system with only one CPU, like most personal computers, say N. If | ||
28 | you have a system with more than one CPU, say Y. | ||
29 | |||
30 | If you say N here, the kernel will run on single and multiprocessor | ||
31 | machines, but will use only one CPU of a multiprocessor machine. If | ||
32 | you say Y here, the kernel will run on many, but not all, | ||
33 | singleprocessor machines. On a singleprocessor machine, the kernel | ||
34 | will run faster if you say N here. | ||
35 | |||
36 | Note that if you say Y here and choose architecture "586" or | ||
37 | "Pentium" under "Processor family", the kernel will not work on 486 | ||
38 | architectures. Similarly, multiprocessor kernels for the "PPro" | ||
39 | architecture may not work on all Pentium based boards. | ||
40 | |||
41 | People using multiprocessor machines who say Y here should also say | ||
42 | Y to "Enhanced Real Time Clock Support", below. The "Advanced Power | ||
43 | Management" code will be disabled if you say Y here. | ||
44 | |||
45 | See also the <file:Documentation/smp.txt>, | ||
46 | <file:Documentation/i386/IO-APIC.txt>, | ||
47 | <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at | ||
48 | <http://www.tldp.org/docs.html#howto>. | ||
49 | |||
50 | If you don't know what to do here, say N. | ||
51 | |||
52 | choice | ||
53 | prompt "Subarchitecture Type" | ||
54 | default X86_PC | ||
55 | |||
56 | config X86_PC | ||
57 | bool "PC-compatible" | ||
58 | help | ||
59 | Choose this option if your computer is a standard PC or compatible. | ||
60 | |||
61 | config X86_ELAN | ||
62 | bool "AMD Elan" | ||
63 | depends on X86_32 | ||
64 | help | ||
65 | Select this for an AMD Elan processor. | ||
66 | |||
67 | Do not use this option for K6/Athlon/Opteron processors! | ||
68 | |||
69 | If unsure, choose "PC-compatible" instead. | ||
70 | |||
71 | config X86_VOYAGER | ||
72 | bool "Voyager (NCR)" | ||
73 | depends on X86_32 | ||
74 | select SMP if !BROKEN | ||
75 | help | ||
76 | Voyager is an MCA-based 32-way capable SMP architecture proprietary | ||
77 | to NCR Corp. Machine classes 345x/35xx/4100/51xx are Voyager-based. | ||
78 | |||
79 | *** WARNING *** | ||
80 | |||
81 | If you do not specifically know you have a Voyager based machine, | ||
82 | say N here, otherwise the kernel you build will not be bootable. | ||
83 | |||
84 | config X86_NUMAQ | ||
85 | bool "NUMAQ (IBM/Sequent)" | ||
86 | select SMP | ||
87 | select NUMA | ||
88 | depends on X86_32 | ||
89 | help | ||
90 | This option is used for getting Linux to run on a (IBM/Sequent) NUMA | ||
91 | multiquad box. This changes the way that processors are bootstrapped, | ||
92 | and uses Clustered Logical APIC addressing mode instead of Flat Logical. | ||
93 | You will need a new lynxer.elf file to flash your firmware with - send | ||
94 | email to <Martin.Bligh@us.ibm.com>. | ||
95 | |||
96 | config X86_SUMMIT | ||
97 | bool "Summit/EXA (IBM x440)" | ||
98 | depends on X86_32 && SMP | ||
99 | help | ||
100 | This option is needed for IBM systems that use the Summit/EXA chipset. | ||
101 | In particular, it is needed for the x440. | ||
102 | |||
103 | If you don't have one of these computers, you should say N here. | ||
104 | If you want to build a NUMA kernel, you must select ACPI. | ||
105 | |||
106 | config X86_BIGSMP | ||
107 | bool "Support for other sub-arch SMP systems with more than 8 CPUs" | ||
108 | depends on X86_32 && SMP | ||
109 | help | ||
110 | This option is needed for the systems that have more than 8 CPUs | ||
111 | and if the system is not of any sub-arch type above. | ||
112 | |||
113 | If you don't have such a system, you should say N here. | ||
114 | |||
115 | config X86_VISWS | ||
116 | bool "SGI 320/540 (Visual Workstation)" | ||
117 | depends on X86_32 | ||
118 | help | ||
119 | The SGI Visual Workstation series is an IA32-based workstation | ||
120 | based on SGI systems chips with some legacy PC hardware attached. | ||
121 | |||
122 | Say Y here to create a kernel to run on the SGI 320 or 540. | ||
123 | |||
124 | A kernel compiled for the Visual Workstation will not run on PCs | ||
125 | and vice versa. See <file:Documentation/sgi-visws.txt> for details. | ||
126 | |||
127 | config X86_GENERICARCH | ||
128 | bool "Generic architecture (Summit, bigsmp, ES7000, default)" | ||
129 | depends on X86_32 | ||
130 | help | ||
131 | This option compiles in the Summit, bigsmp, ES7000, default subarchitectures. | ||
132 | It is intended for a generic binary kernel. | ||
133 | If you want a NUMA kernel, select ACPI. We need SRAT for NUMA. | ||
134 | |||
135 | config X86_ES7000 | ||
136 | bool "Support for Unisys ES7000 IA32 series" | ||
137 | depends on X86_32 && SMP | ||
138 | help | ||
139 | Support for Unisys ES7000 systems. Say 'Y' here if this kernel is | ||
140 | supposed to run on an IA32-based Unisys ES7000 system. | ||
141 | Only choose this option if you have such a system, otherwise you | ||
142 | should say N here. | ||
143 | |||
144 | config X86_VSMP | ||
145 | bool "Support for ScaleMP vSMP" | ||
146 | depends on X86_64 && PCI | ||
147 | help | ||
148 | Support for ScaleMP vSMP systems. Say 'Y' here if this kernel is | ||
149 | supposed to run on these EM64T-based machines. Only choose this option | ||
150 | if you have one of these machines. | ||
151 | |||
152 | endchoice | ||
153 | |||
154 | config SCHED_NO_NO_OMIT_FRAME_POINTER | ||
155 | bool "Single-depth WCHAN output" | ||
156 | default y | ||
157 | depends on X86_32 | ||
158 | help | ||
159 | Calculate simpler /proc/<PID>/wchan values. If this option | ||
160 | is disabled then wchan values will recurse back to the | ||
161 | caller function. This provides more accurate wchan values, | ||
162 | at the expense of slightly more scheduling overhead. | ||
163 | |||
164 | If in doubt, say "Y". | ||
165 | |||
166 | config PARAVIRT | ||
167 | bool | ||
168 | depends on X86_32 && !(X86_VISWS || X86_VOYAGER) | ||
169 | help | ||
170 | This changes the kernel so it can modify itself when it is run | ||
171 | under a hypervisor, potentially improving performance significantly | ||
172 | over full virtualization. However, when run without a hypervisor | ||
173 | the kernel is theoretically slower and slightly larger. | ||
174 | |||
175 | menuconfig PARAVIRT_GUEST | ||
176 | bool "Paravirtualized guest support" | ||
177 | depends on X86_32 | ||
178 | help | ||
179 | Say Y here to get to see options related to running Linux under | ||
180 | various hypervisors. This option alone does not add any kernel code. | ||
181 | |||
182 | If you say N, all options in this submenu will be skipped and disabled. | ||
183 | |||
184 | if PARAVIRT_GUEST | ||
185 | |||
186 | source "arch/x86/xen/Kconfig" | ||
187 | |||
188 | config VMI | ||
189 | bool "VMI Guest support" | ||
190 | select PARAVIRT | ||
191 | depends on !(X86_VISWS || X86_VOYAGER) | ||
192 | help | ||
193 | VMI provides a paravirtualized interface to the VMware ESX server | ||
194 | (it could be used by other hypervisors in theory too, but is not | ||
195 | at the moment), by linking the kernel to a GPL-ed ROM module | ||
196 | provided by the hypervisor. | ||
197 | |||
198 | source "arch/x86/lguest/Kconfig" | ||
199 | |||
200 | endif | ||
201 | |||
202 | config ACPI_SRAT | ||
203 | bool | ||
204 | default y | ||
205 | depends on X86_32 && ACPI && NUMA && (X86_SUMMIT || X86_GENERICARCH) | ||
206 | select ACPI_NUMA | ||
207 | |||
208 | config HAVE_ARCH_PARSE_SRAT | ||
209 | bool | ||
210 | default y | ||
211 | depends on ACPI_SRAT | ||
212 | |||
213 | config X86_SUMMIT_NUMA | ||
214 | bool | ||
215 | default y | ||
216 | depends on X86_32 && NUMA && (X86_SUMMIT || X86_GENERICARCH) | ||
217 | |||
218 | config X86_CYCLONE_TIMER | ||
219 | bool | ||
220 | default y | ||
221 | depends on X86_32 && X86_SUMMIT || X86_GENERICARCH | ||
222 | |||
223 | config ES7000_CLUSTERED_APIC | ||
224 | bool | ||
225 | default y | ||
226 | depends on SMP && X86_ES7000 && MPENTIUMIII | ||
227 | |||
228 | source "arch/x86/Kconfig.cpu" | ||
229 | |||
230 | config HPET_TIMER | ||
231 | bool | ||
232 | prompt "HPET Timer Support" if X86_32 | ||
233 | default X86_64 | ||
234 | help | ||
235 | Use the IA-PC HPET (High Precision Event Timer) to manage | ||
236 | time in preference to the PIT and RTC, if a HPET is | ||
237 | present. | ||
238 | HPET is the next generation timer replacing legacy 8254s. | ||
239 | The HPET provides a stable time base on SMP | ||
240 | systems, unlike the TSC, but it is more expensive to access, | ||
241 | as it is off-chip. You can find the HPET spec at | ||
242 | <http://www.intel.com/hardwaredesign/hpetspec.htm>. | ||
243 | |||
244 | You can safely choose Y here. However, HPET will only be | ||
245 | activated if the platform and the BIOS support this feature. | ||
246 | Otherwise the 8254 will be used for timing services. | ||
247 | |||
248 | Choose N to continue using the legacy 8254 timer. | ||
249 | |||
250 | config HPET_EMULATE_RTC | ||
251 | bool | ||
252 | depends on HPET_TIMER && RTC=y | ||
253 | default y | ||
254 | |||
255 | # Mark as embedded because too many people got it wrong. | ||
256 | # The code disables itself when not needed. | ||
257 | config GART_IOMMU | ||
258 | bool "GART IOMMU support" if EMBEDDED | ||
259 | default y | ||
260 | select SWIOTLB | ||
261 | select AGP | ||
262 | depends on X86_64 && PCI | ||
263 | help | ||
264 | Support for full DMA access of devices with 32bit memory access only | ||
265 | on systems with more than 3GB. This is usually needed for USB, | ||
266 | sound, many IDE/SATA chipsets and some other devices. | ||
267 | Provides a driver for the AMD Athlon64/Opteron/Turion/Sempron GART | ||
268 | based hardware IOMMU and a software bounce buffer based IOMMU used | ||
269 | on Intel systems and as fallback. | ||
270 | The code is only active when needed (enough memory and limited | ||
271 | device) unless CONFIG_IOMMU_DEBUG or iommu=force is specified | ||
272 | too. | ||
273 | |||
274 | config CALGARY_IOMMU | ||
275 | bool "IBM Calgary IOMMU support" | ||
276 | select SWIOTLB | ||
277 | depends on X86_64 && PCI && EXPERIMENTAL | ||
278 | help | ||
279 | Support for hardware IOMMUs in IBM's xSeries x366 and x460 | ||
280 | systems. Needed to run systems with more than 3GB of memory | ||
281 | properly with 32-bit PCI devices that do not support DAC | ||
282 | (Double Address Cycle). Calgary also supports bus level | ||
283 | isolation, where all DMAs pass through the IOMMU. This | ||
284 | prevents them from going anywhere except their intended | ||
285 | destination. This catches hard-to-find kernel bugs and | ||
286 | mis-behaving drivers and devices that do not use the DMA-API | ||
287 | properly to set up their DMA buffers. The IOMMU can be | ||
288 | turned off at boot time with the iommu=off parameter. | ||
289 | Normally the kernel will make the right choice by itself. | ||
290 | If unsure, say Y. | ||
291 | |||
292 | config CALGARY_IOMMU_ENABLED_BY_DEFAULT | ||
293 | bool "Should Calgary be enabled by default?" | ||
294 | default y | ||
295 | depends on CALGARY_IOMMU | ||
296 | help | ||
297 | Should Calgary be enabled by default? if you choose 'y', Calgary | ||
298 | will be used (if it exists). If you choose 'n', Calgary will not be | ||
299 | used even if it exists. If you choose 'n' and would like to use | ||
300 | Calgary anyway, pass 'iommu=calgary' on the kernel command line. | ||
301 | If unsure, say Y. | ||
302 | |||
303 | # need this always selected by IOMMU for the VIA workaround | ||
304 | config SWIOTLB | ||
305 | bool | ||
306 | help | ||
307 | Support for software bounce buffers used on x86-64 systems | ||
308 | which don't have a hardware IOMMU (e.g. the current generation | ||
309 | of Intel's x86-64 CPUs). Using this PCI devices which can only | ||
310 | access 32-bits of memory can be used on systems with more than | ||
311 | 3 GB of memory. If unsure, say Y. | ||
312 | |||
313 | |||
314 | config NR_CPUS | ||
315 | int "Maximum number of CPUs (2-255)" | ||
316 | range 2 255 | ||
317 | depends on SMP | ||
318 | default "32" if X86_NUMAQ || X86_SUMMIT || X86_BIGSMP || X86_ES7000 | ||
319 | default "8" | ||
320 | help | ||
321 | This allows you to specify the maximum number of CPUs which this | ||
322 | kernel will support. The maximum supported value is 255 and the | ||
323 | minimum value which makes sense is 2. | ||
324 | |||
325 | This is purely to save memory - each supported CPU adds | ||
326 | approximately eight kilobytes to the kernel image. | ||
327 | |||
328 | config SCHED_SMT | ||
329 | bool "SMT (Hyperthreading) scheduler support" | ||
330 | depends on (X86_64 && SMP) || (X86_32 && X86_HT) | ||
331 | help | ||
332 | SMT scheduler support improves the CPU scheduler's decision making | ||
333 | when dealing with Intel Pentium 4 chips with HyperThreading at a | ||
334 | cost of slightly increased overhead in some places. If unsure say | ||
335 | N here. | ||
336 | |||
337 | config SCHED_MC | ||
338 | bool "Multi-core scheduler support" | ||
339 | depends on (X86_64 && SMP) || (X86_32 && X86_HT) | ||
340 | default y | ||
341 | help | ||
342 | Multi-core scheduler support improves the CPU scheduler's decision | ||
343 | making when dealing with multi-core CPU chips at a cost of slightly | ||
344 | increased overhead in some places. If unsure say N here. | ||
345 | |||
346 | source "kernel/Kconfig.preempt" | ||
347 | |||
348 | config X86_UP_APIC | ||
349 | bool "Local APIC support on uniprocessors" | ||
350 | depends on X86_32 && !SMP && !(X86_VISWS || X86_VOYAGER || X86_GENERICARCH) | ||
351 | help | ||
352 | A local APIC (Advanced Programmable Interrupt Controller) is an | ||
353 | integrated interrupt controller in the CPU. If you have a single-CPU | ||
354 | system which has a processor with a local APIC, you can say Y here to | ||
355 | enable and use it. If you say Y here even though your machine doesn't | ||
356 | have a local APIC, then the kernel will still run with no slowdown at | ||
357 | all. The local APIC supports CPU-generated self-interrupts (timer, | ||
358 | performance counters), and the NMI watchdog which detects hard | ||
359 | lockups. | ||
360 | |||
361 | config X86_UP_IOAPIC | ||
362 | bool "IO-APIC support on uniprocessors" | ||
363 | depends on X86_UP_APIC | ||
364 | help | ||
365 | An IO-APIC (I/O Advanced Programmable Interrupt Controller) is an | ||
366 | SMP-capable replacement for PC-style interrupt controllers. Most | ||
367 | SMP systems and many recent uniprocessor systems have one. | ||
368 | |||
369 | If you have a single-CPU system with an IO-APIC, you can say Y here | ||
370 | to use it. If you say Y here even though your machine doesn't have | ||
371 | an IO-APIC, then the kernel will still run with no slowdown at all. | ||
372 | |||
373 | config X86_LOCAL_APIC | ||
374 | bool | ||
375 | depends on X86_64 || (X86_32 && (X86_UP_APIC || ((X86_VISWS || SMP) && !X86_VOYAGER) || X86_GENERICARCH)) | ||
376 | default y | ||
377 | |||
378 | config X86_IO_APIC | ||
379 | bool | ||
380 | depends on X86_64 || (X86_32 && (X86_UP_IOAPIC || (SMP && !(X86_VISWS || X86_VOYAGER)) || X86_GENERICARCH)) | ||
381 | default y | ||
382 | |||
383 | config X86_VISWS_APIC | ||
384 | bool | ||
385 | depends on X86_32 && X86_VISWS | ||
386 | default y | ||
387 | |||
388 | config X86_MCE | ||
389 | bool "Machine Check Exception" | ||
390 | depends on !X86_VOYAGER | ||
391 | ---help--- | ||
392 | Machine Check Exception support allows the processor to notify the | ||
393 | kernel if it detects a problem (e.g. overheating, component failure). | ||
394 | The action the kernel takes depends on the severity of the problem, | ||
395 | ranging from a warning message on the console, to halting the machine. | ||
396 | Your processor must be a Pentium or newer to support this - check the | ||
397 | flags in /proc/cpuinfo for mce. Note that some older Pentium systems | ||
398 | have a design flaw which leads to false MCE events - hence MCE is | ||
399 | disabled on all P5 processors, unless explicitly enabled with "mce" | ||
400 | as a boot argument. Similarly, if MCE is built in and creates a | ||
401 | problem on some new non-standard machine, you can boot with "nomce" | ||
402 | to disable it. MCE support simply ignores non-MCE processors like | ||
403 | the 386 and 486, so nearly everyone can say Y here. | ||
404 | |||
405 | config X86_MCE_INTEL | ||
406 | bool "Intel MCE features" | ||
407 | depends on X86_64 && X86_MCE && X86_LOCAL_APIC | ||
408 | default y | ||
409 | help | ||
410 | Additional support for intel specific MCE features such as | ||
411 | the thermal monitor. | ||
412 | |||
413 | config X86_MCE_AMD | ||
414 | bool "AMD MCE features" | ||
415 | depends on X86_64 && X86_MCE && X86_LOCAL_APIC | ||
416 | default y | ||
417 | help | ||
418 | Additional support for AMD specific MCE features such as | ||
419 | the DRAM Error Threshold. | ||
420 | |||
421 | config X86_MCE_NONFATAL | ||
422 | tristate "Check for non-fatal errors on AMD Athlon/Duron / Intel Pentium 4" | ||
423 | depends on X86_32 && X86_MCE | ||
424 | help | ||
425 | Enabling this feature starts a timer that triggers every 5 seconds which | ||
426 | will look at the machine check registers to see if anything happened. | ||
427 | Non-fatal problems automatically get corrected (but still logged). | ||
428 | Disable this if you don't want to see these messages. | ||
429 | Seeing the messages this option prints out may be indicative of dying | ||
430 | or out-of-spec (ie, overclocked) hardware. | ||
431 | This option only does something on certain CPUs. | ||
432 | (AMD Athlon/Duron and Intel Pentium 4) | ||
433 | |||
434 | config X86_MCE_P4THERMAL | ||
435 | bool "check for P4 thermal throttling interrupt." | ||
436 | depends on X86_32 && X86_MCE && (X86_UP_APIC || SMP) && !X86_VISWS | ||
437 | help | ||
438 | Enabling this feature will cause a message to be printed when the P4 | ||
439 | enters thermal throttling. | ||
440 | |||
441 | config VM86 | ||
442 | bool "Enable VM86 support" if EMBEDDED | ||
443 | default y | ||
444 | depends on X86_32 | ||
445 | help | ||
446 | This option is required by programs like DOSEMU to run 16-bit legacy | ||
447 | code on X86 processors. It also may be needed by software like | ||
448 | XFree86 to initialize some video cards via BIOS. Disabling this | ||
449 | option saves about 6k. | ||
450 | |||
451 | config TOSHIBA | ||
452 | tristate "Toshiba Laptop support" | ||
453 | depends on X86_32 | ||
454 | ---help--- | ||
455 | This adds a driver to safely access the System Management Mode of | ||
456 | the CPU on Toshiba portables with a genuine Toshiba BIOS. It does | ||
457 | not work on models with a Phoenix BIOS. The System Management Mode | ||
458 | is used to set the BIOS and power saving options on Toshiba portables. | ||
459 | |||
460 | For information on utilities to make use of this driver see the | ||
461 | Toshiba Linux utilities web site at: | ||
462 | <http://www.buzzard.org.uk/toshiba/>. | ||
463 | |||
464 | Say Y if you intend to run this kernel on a Toshiba portable. | ||
465 | Say N otherwise. | ||
466 | |||
467 | config I8K | ||
468 | tristate "Dell laptop support" | ||
469 | depends on X86_32 | ||
470 | ---help--- | ||
471 | This adds a driver to safely access the System Management Mode | ||
472 | of the CPU on the Dell Inspiron 8000. The System Management Mode | ||
473 | is used to read cpu temperature and cooling fan status and to | ||
474 | control the fans on the I8K portables. | ||
475 | |||
476 | This driver has been tested only on the Inspiron 8000 but it may | ||
477 | also work with other Dell laptops. You can force loading on other | ||
478 | models by passing the parameter `force=1' to the module. Use at | ||
479 | your own risk. | ||
480 | |||
481 | For information on utilities to make use of this driver see the | ||
482 | I8K Linux utilities web site at: | ||
483 | <http://people.debian.org/~dz/i8k/> | ||
484 | |||
485 | Say Y if you intend to run this kernel on a Dell Inspiron 8000. | ||
486 | Say N otherwise. | ||
487 | |||
488 | config X86_REBOOTFIXUPS | ||
489 | bool "Enable X86 board specific fixups for reboot" | ||
490 | depends on X86_32 && X86 | ||
491 | default n | ||
492 | ---help--- | ||
493 | This enables chipset and/or board specific fixups to be done | ||
494 | in order to get reboot to work correctly. This is only needed on | ||
495 | some combinations of hardware and BIOS. The symptom, for which | ||
496 | this config is intended, is when reboot ends with a stalled/hung | ||
497 | system. | ||
498 | |||
499 | Currently, the only fixup is for the Geode machines using | ||
500 | CS5530A and CS5536 chipsets. | ||
501 | |||
502 | Say Y if you want to enable the fixup. Currently, it's safe to | ||
503 | enable this option even if you don't need it. | ||
504 | Say N otherwise. | ||
505 | |||
506 | config MICROCODE | ||
507 | tristate "/dev/cpu/microcode - Intel IA32 CPU microcode support" | ||
508 | select FW_LOADER | ||
509 | ---help--- | ||
510 | If you say Y here, you will be able to update the microcode on | ||
511 | Intel processors in the IA32 family, e.g. Pentium Pro, Pentium II, | ||
512 | Pentium III, Pentium 4, Xeon etc. You will obviously need the | ||
513 | actual microcode binary data itself which is not shipped with the | ||
514 | Linux kernel. | ||
515 | |||
516 | For latest news and information on obtaining all the required | ||
517 | ingredients for this driver, check: | ||
518 | <http://www.urbanmyth.org/microcode/>. | ||
519 | |||
520 | To compile this driver as a module, choose M here: the | ||
521 | module will be called microcode. | ||
522 | |||
523 | config MICROCODE_OLD_INTERFACE | ||
524 | bool | ||
525 | depends on MICROCODE | ||
526 | default y | ||
527 | |||
528 | config X86_MSR | ||
529 | tristate "/dev/cpu/*/msr - Model-specific register support" | ||
530 | help | ||
531 | This device gives privileged processes access to the x86 | ||
532 | Model-Specific Registers (MSRs). It is a character device with | ||
533 | major 202 and minors 0 to 31 for /dev/cpu/0/msr to /dev/cpu/31/msr. | ||
534 | MSR accesses are directed to a specific CPU on multi-processor | ||
535 | systems. | ||
536 | |||
537 | config X86_CPUID | ||
538 | tristate "/dev/cpu/*/cpuid - CPU information support" | ||
539 | help | ||
540 | This device gives processes access to the x86 CPUID instruction to | ||
541 | be executed on a specific processor. It is a character device | ||
542 | with major 203 and minors 0 to 31 for /dev/cpu/0/cpuid to | ||
543 | /dev/cpu/31/cpuid. | ||
544 | |||
545 | choice | ||
546 | prompt "High Memory Support" | ||
547 | default HIGHMEM4G if !X86_NUMAQ | ||
548 | default HIGHMEM64G if X86_NUMAQ | ||
549 | depends on X86_32 | ||
550 | |||
551 | config NOHIGHMEM | ||
552 | bool "off" | ||
553 | depends on !X86_NUMAQ | ||
554 | ---help--- | ||
555 | Linux can use up to 64 Gigabytes of physical memory on x86 systems. | ||
556 | However, the address space of 32-bit x86 processors is only 4 | ||
557 | Gigabytes large. That means that, if you have a large amount of | ||
558 | physical memory, not all of it can be "permanently mapped" by the | ||
559 | kernel. The physical memory that's not permanently mapped is called | ||
560 | "high memory". | ||
561 | |||
562 | If you are compiling a kernel which will never run on a machine with | ||
563 | more than 1 Gigabyte total physical RAM, answer "off" here (default | ||
564 | choice and suitable for most users). This will result in a "3GB/1GB" | ||
565 | split: 3GB are mapped so that each process sees a 3GB virtual memory | ||
566 | space and the remaining part of the 4GB virtual memory space is used | ||
567 | by the kernel to permanently map as much physical memory as | ||
568 | possible. | ||
569 | |||
570 | If the machine has between 1 and 4 Gigabytes physical RAM, then | ||
571 | answer "4GB" here. | ||
572 | |||
573 | If more than 4 Gigabytes is used then answer "64GB" here. This | ||
574 | selection turns Intel PAE (Physical Address Extension) mode on. | ||
575 | PAE implements 3-level paging on IA32 processors. PAE is fully | ||
576 | supported by Linux, PAE mode is implemented on all recent Intel | ||
577 | processors (Pentium Pro and better). NOTE: If you say "64GB" here, | ||
578 | then the kernel will not boot on CPUs that don't support PAE! | ||
579 | |||
580 | The actual amount of total physical memory will either be | ||
581 | auto detected or can be forced by using a kernel command line option | ||
582 | such as "mem=256M". (Try "man bootparam" or see the documentation of | ||
583 | your boot loader (lilo or loadlin) about how to pass options to the | ||
584 | kernel at boot time.) | ||
585 | |||
586 | If unsure, say "off". | ||
587 | |||
588 | config HIGHMEM4G | ||
589 | bool "4GB" | ||
590 | depends on !X86_NUMAQ | ||
591 | help | ||
592 | Select this if you have a 32-bit processor and between 1 and 4 | ||
593 | gigabytes of physical RAM. | ||
594 | |||
595 | config HIGHMEM64G | ||
596 | bool "64GB" | ||
597 | depends on !M386 && !M486 | ||
598 | select X86_PAE | ||
599 | help | ||
600 | Select this if you have a 32-bit processor and more than 4 | ||
601 | gigabytes of physical RAM. | ||
602 | |||
603 | endchoice | ||
604 | |||
605 | choice | ||
606 | depends on EXPERIMENTAL | ||
607 | prompt "Memory split" if EMBEDDED | ||
608 | default VMSPLIT_3G | ||
609 | depends on X86_32 | ||
610 | help | ||
611 | Select the desired split between kernel and user memory. | ||
612 | |||
613 | If the address range available to the kernel is less than the | ||
614 | physical memory installed, the remaining memory will be available | ||
615 | as "high memory". Accessing high memory is a little more costly | ||
616 | than low memory, as it needs to be mapped into the kernel first. | ||
617 | Note that increasing the kernel address space limits the range | ||
618 | available to user programs, making the address space there | ||
619 | tighter. Selecting anything other than the default 3G/1G split | ||
620 | will also likely make your kernel incompatible with binary-only | ||
621 | kernel modules. | ||
622 | |||
623 | If you are not absolutely sure what you are doing, leave this | ||
624 | option alone! | ||
625 | |||
626 | config VMSPLIT_3G | ||
627 | bool "3G/1G user/kernel split" | ||
628 | config VMSPLIT_3G_OPT | ||
629 | depends on !X86_PAE | ||
630 | bool "3G/1G user/kernel split (for full 1G low memory)" | ||
631 | config VMSPLIT_2G | ||
632 | bool "2G/2G user/kernel split" | ||
633 | config VMSPLIT_2G_OPT | ||
634 | depends on !X86_PAE | ||
635 | bool "2G/2G user/kernel split (for full 2G low memory)" | ||
636 | config VMSPLIT_1G | ||
637 | bool "1G/3G user/kernel split" | ||
638 | endchoice | ||
639 | |||
640 | config PAGE_OFFSET | ||
641 | hex | ||
642 | default 0xB0000000 if VMSPLIT_3G_OPT | ||
643 | default 0x80000000 if VMSPLIT_2G | ||
644 | default 0x78000000 if VMSPLIT_2G_OPT | ||
645 | default 0x40000000 if VMSPLIT_1G | ||
646 | default 0xC0000000 | ||
647 | depends on X86_32 | ||
648 | |||
649 | config HIGHMEM | ||
650 | bool | ||
651 | depends on X86_32 && (HIGHMEM64G || HIGHMEM4G) | ||
652 | default y | ||
653 | |||
654 | config X86_PAE | ||
655 | bool "PAE (Physical Address Extension) Support" | ||
656 | default n | ||
657 | depends on X86_32 && !HIGHMEM4G | ||
658 | select RESOURCES_64BIT | ||
659 | help | ||
660 | PAE is required for NX support, and furthermore enables | ||
661 | larger swapspace support for non-overcommit purposes. It | ||
662 | has the cost of more pagetable lookup overhead, and also | ||
663 | consumes more pagetable space per process. | ||
664 | |||
665 | # Common NUMA Features | ||
666 | config NUMA | ||
667 | bool "Numa Memory Allocation and Scheduler Support (EXPERIMENTAL)" | ||
668 | depends on SMP | ||
669 | depends on X86_64 || (X86_32 && HIGHMEM64G && (X86_NUMAQ || (X86_SUMMIT || X86_GENERICARCH) && ACPI) && EXPERIMENTAL) | ||
670 | default n if X86_PC | ||
671 | default y if (X86_NUMAQ || X86_SUMMIT) | ||
672 | help | ||
673 | Enable NUMA (Non Uniform Memory Access) support. | ||
674 | The kernel will try to allocate memory used by a CPU on the | ||
675 | local memory controller of the CPU and add some more | ||
676 | NUMA awareness to the kernel. | ||
677 | |||
678 | For i386 this is currently highly experimental and should be only | ||
679 | used for kernel development. It might also cause boot failures. | ||
680 | For x86_64 this is recommended on all multiprocessor Opteron systems. | ||
681 | If the system is EM64T, you should say N unless your system is | ||
682 | EM64T NUMA. | ||
683 | |||
684 | comment "NUMA (Summit) requires SMP, 64GB highmem support, ACPI" | ||
685 | depends on X86_32 && X86_SUMMIT && (!HIGHMEM64G || !ACPI) | ||
686 | |||
687 | config K8_NUMA | ||
688 | bool "Old style AMD Opteron NUMA detection" | ||
689 | depends on X86_64 && NUMA && PCI | ||
690 | default y | ||
691 | help | ||
692 | Enable K8 NUMA node topology detection. You should say Y here if | ||
693 | you have a multi processor AMD K8 system. This uses an old | ||
694 | method to read the NUMA configuration directly from the builtin | ||
695 | Northbridge of Opteron. It is recommended to use X86_64_ACPI_NUMA | ||
696 | instead, which also takes priority if both are compiled in. | ||
697 | |||
698 | config X86_64_ACPI_NUMA | ||
699 | bool "ACPI NUMA detection" | ||
700 | depends on X86_64 && NUMA && ACPI && PCI | ||
701 | select ACPI_NUMA | ||
702 | default y | ||
703 | help | ||
704 | Enable ACPI SRAT based node topology detection. | ||
705 | |||
706 | config NUMA_EMU | ||
707 | bool "NUMA emulation" | ||
708 | depends on X86_64 && NUMA | ||
709 | help | ||
710 | Enable NUMA emulation. A flat machine will be split | ||
711 | into virtual nodes when booted with "numa=fake=N", where N is the | ||
712 | number of nodes. This is only useful for debugging. | ||
713 | |||
714 | config NODES_SHIFT | ||
715 | int | ||
716 | default "6" if X86_64 | ||
717 | default "4" if X86_NUMAQ | ||
718 | default "3" | ||
719 | depends on NEED_MULTIPLE_NODES | ||
720 | |||
721 | config HAVE_ARCH_BOOTMEM_NODE | ||
722 | bool | ||
723 | depends on X86_32 && NUMA | ||
724 | default y | ||
725 | |||
726 | config ARCH_HAVE_MEMORY_PRESENT | ||
727 | bool | ||
728 | depends on X86_32 && DISCONTIGMEM | ||
729 | default y | ||
730 | |||
731 | config NEED_NODE_MEMMAP_SIZE | ||
732 | bool | ||
733 | depends on X86_32 && (DISCONTIGMEM || SPARSEMEM) | ||
734 | default y | ||
735 | |||
736 | config HAVE_ARCH_ALLOC_REMAP | ||
737 | bool | ||
738 | depends on X86_32 && NUMA | ||
739 | default y | ||
740 | |||
741 | config ARCH_FLATMEM_ENABLE | ||
742 | def_bool y | ||
743 | depends on (X86_32 && ARCH_SELECT_MEMORY_MODEL && X86_PC) || (X86_64 && !NUMA) | ||
744 | |||
745 | config ARCH_DISCONTIGMEM_ENABLE | ||
746 | def_bool y | ||
747 | depends on NUMA | ||
748 | |||
749 | config ARCH_DISCONTIGMEM_DEFAULT | ||
750 | def_bool y | ||
751 | depends on NUMA | ||
752 | |||
753 | config ARCH_SPARSEMEM_ENABLE | ||
754 | def_bool y | ||
755 | depends on NUMA || (EXPERIMENTAL && (X86_PC || X86_64)) | ||
756 | select SPARSEMEM_STATIC if X86_32 | ||
757 | select SPARSEMEM_VMEMMAP_ENABLE if X86_64 | ||
758 | |||
759 | config ARCH_SELECT_MEMORY_MODEL | ||
760 | def_bool y | ||
761 | depends on X86_32 && ARCH_SPARSEMEM_ENABLE | ||
762 | |||
763 | config ARCH_MEMORY_PROBE | ||
764 | def_bool X86_64 | ||
765 | depends on MEMORY_HOTPLUG | ||
766 | |||
767 | source "mm/Kconfig" | ||
768 | |||
769 | config HIGHPTE | ||
770 | bool "Allocate 3rd-level pagetables from highmem" | ||
771 | depends on X86_32 && (HIGHMEM4G || HIGHMEM64G) | ||
772 | help | ||
773 | The VM uses one page table entry for each page of physical memory. | ||
774 | For systems with a lot of RAM, this can be wasteful of precious | ||
775 | low memory. Setting this option will put user-space page table | ||
776 | entries in high memory. | ||
777 | |||
778 | config MATH_EMULATION | ||
779 | bool | ||
780 | prompt "Math emulation" if X86_32 | ||
781 | ---help--- | ||
782 | Linux can emulate a math coprocessor (used for floating point | ||
783 | operations) if you don't have one. 486DX and Pentium processors have | ||
784 | a math coprocessor built in, 486SX and 386 do not, unless you added | ||
785 | a 487DX or 387, respectively. (The messages during boot time can | ||
786 | give you some hints here ["man dmesg"].) Everyone needs either a | ||
787 | coprocessor or this emulation. | ||
788 | |||
789 | If you don't have a math coprocessor, you need to say Y here; if you | ||
790 | say Y here even though you have a coprocessor, the coprocessor will | ||
791 | be used nevertheless. (This behavior can be changed with the kernel | ||
792 | command line option "no387", which comes handy if your coprocessor | ||
793 | is broken. Try "man bootparam" or see the documentation of your boot | ||
794 | loader (lilo or loadlin) about how to pass options to the kernel at | ||
795 | boot time.) This means that it is a good idea to say Y here if you | ||
796 | intend to use this kernel on different machines. | ||
797 | |||
798 | More information about the internals of the Linux math coprocessor | ||
799 | emulation can be found in <file:arch/x86/math-emu/README>. | ||
800 | |||
801 | If you are not sure, say Y; apart from resulting in a 66 KB bigger | ||
802 | kernel, it won't hurt. | ||
803 | |||
804 | config MTRR | ||
805 | bool "MTRR (Memory Type Range Register) support" | ||
806 | ---help--- | ||
807 | On Intel P6 family processors (Pentium Pro, Pentium II and later) | ||
808 | the Memory Type Range Registers (MTRRs) may be used to control | ||
809 | processor access to memory ranges. This is most useful if you have | ||
810 | a video (VGA) card on a PCI or AGP bus. Enabling write-combining | ||
811 | allows bus write transfers to be combined into a larger transfer | ||
812 | before bursting over the PCI/AGP bus. This can increase performance | ||
813 | of image write operations 2.5 times or more. Saying Y here creates a | ||
814 | /proc/mtrr file which may be used to manipulate your processor's | ||
815 | MTRRs. Typically the X server should use this. | ||
816 | |||
817 | This code has a reasonably generic interface so that similar | ||
818 | control registers on other processors can be easily supported | ||
819 | as well: | ||
820 | |||
821 | The Cyrix 6x86, 6x86MX and M II processors have Address Range | ||
822 | Registers (ARRs) which provide a similar functionality to MTRRs. For | ||
823 | these, the ARRs are used to emulate the MTRRs. | ||
824 | The AMD K6-2 (stepping 8 and above) and K6-3 processors have two | ||
825 | MTRRs. The Centaur C6 (WinChip) has 8 MCRs, allowing | ||
826 | write-combining. All of these processors are supported by this code | ||
827 | and it makes sense to say Y here if you have one of them. | ||
828 | |||
829 | Saying Y here also fixes a problem with buggy SMP BIOSes which only | ||
830 | set the MTRRs for the boot CPU and not for the secondary CPUs. This | ||
831 | can lead to all sorts of problems, so it's good to say Y here. | ||
832 | |||
833 | You can safely say Y even if your machine doesn't have MTRRs, you'll | ||
834 | just add about 9 KB to your kernel. | ||
835 | |||
836 | See <file:Documentation/mtrr.txt> for more information. | ||
837 | |||
838 | config EFI | ||
839 | bool "Boot from EFI support" | ||
840 | depends on X86_32 && ACPI | ||
841 | default n | ||
842 | ---help--- | ||
843 | This enables the kernel to boot on EFI platforms using | ||
844 | system configuration information passed to it from the firmware. | ||
845 | This also enables the kernel to use any EFI runtime services that are | ||
846 | available (such as the EFI variable services). | ||
847 | |||
848 | This option is only useful on systems that have EFI firmware | ||
849 | and will result in a kernel image that is ~8k larger. In addition, | ||
850 | you must use the latest ELILO loader available at | ||
851 | <http://elilo.sourceforge.net> in order to take advantage of | ||
852 | kernel initialization using EFI information (neither GRUB nor LILO know | ||
853 | anything about EFI). However, even with this option, the resultant | ||
854 | kernel should continue to boot on existing non-EFI platforms. | ||
855 | |||
856 | config IRQBALANCE | ||
857 | bool "Enable kernel irq balancing" | ||
858 | depends on X86_32 && SMP && X86_IO_APIC | ||
859 | default y | ||
860 | help | ||
861 | The default yes will allow the kernel to do irq load balancing. | ||
862 | Saying no will keep the kernel from doing irq load balancing. | ||
863 | |||
864 | # turning this on wastes a bunch of space. | ||
865 | # Summit needs it only when NUMA is on | ||
866 | config BOOT_IOREMAP | ||
867 | bool | ||
868 | depends on X86_32 && (((X86_SUMMIT || X86_GENERICARCH) && NUMA) || (X86 && EFI)) | ||
869 | default y | ||
870 | |||
871 | config SECCOMP | ||
872 | bool "Enable seccomp to safely compute untrusted bytecode" | ||
873 | depends on PROC_FS | ||
874 | default y | ||
875 | help | ||
876 | This kernel feature is useful for number crunching applications | ||
877 | that may need to compute untrusted bytecode during their | ||
878 | execution. By using pipes or other transports made available to | ||
879 | the process as file descriptors supporting the read/write | ||
880 | syscalls, it's possible to isolate those applications in | ||
881 | their own address space using seccomp. Once seccomp is | ||
882 | enabled via /proc/<pid>/seccomp, it cannot be disabled | ||
883 | and the task is only allowed to execute a few safe syscalls | ||
884 | defined by each seccomp mode. | ||
885 | |||
886 | If unsure, say Y. Only embedded should say N here. | ||
887 | |||
888 | config CC_STACKPROTECTOR | ||
889 | bool "Enable -fstack-protector buffer overflow detection (EXPERIMENTAL)" | ||
890 | depends on X86_64 && EXPERIMENTAL | ||
891 | help | ||
892 | This option turns on the -fstack-protector GCC feature. This | ||
893 | feature puts, at the beginning of critical functions, a canary | ||
894 | value on the stack just before the return address, and validates | ||
895 | the value just before actually returning. Stack based buffer | ||
896 | overflows (that need to overwrite this return address) now also | ||
897 | overwrite the canary, which gets detected and the attack is then | ||
898 | neutralized via a kernel panic. | ||
899 | |||
900 | This feature requires gcc version 4.2 or above, or a distribution | ||
901 | gcc with the feature backported. Older versions are automatically | ||
902 | detected and for those versions, this configuration option is ignored. | ||
903 | |||
904 | config CC_STACKPROTECTOR_ALL | ||
905 | bool "Use stack-protector for all functions" | ||
906 | depends on CC_STACKPROTECTOR | ||
907 | help | ||
908 | Normally, GCC only inserts the canary value protection for | ||
909 | functions that use large-ish on-stack buffers. By enabling | ||
910 | this option, GCC will be asked to do this for ALL functions. | ||
911 | |||
912 | source kernel/Kconfig.hz | ||
913 | |||
914 | config KEXEC | ||
915 | bool "kexec system call" | ||
916 | help | ||
917 | kexec is a system call that implements the ability to shutdown your | ||
918 | current kernel, and to start another kernel. It is like a reboot | ||
919 | but it is independent of the system firmware. And like a reboot | ||
920 | you can start any kernel with it, not just Linux. | ||
921 | |||
922 | The name comes from the similarity to the exec system call. | ||
923 | |||
924 | It is an ongoing process to be certain the hardware in a machine | ||
925 | is properly shutdown, so do not be surprised if this code does not | ||
926 | initially work for you. It may help to enable device hotplugging | ||
927 | support. As of this writing the exact hardware interface is | ||
928 | strongly in flux, so no good recommendation can be made. | ||
929 | |||
930 | config CRASH_DUMP | ||
931 | bool "kernel crash dumps (EXPERIMENTAL)" | ||
932 | depends on EXPERIMENTAL | ||
933 | depends on X86_64 || (X86_32 && HIGHMEM) | ||
934 | help | ||
935 | Generate crash dump after being started by kexec. | ||
936 | This should be normally only set in special crash dump kernels | ||
937 | which are loaded in the main kernel with kexec-tools into | ||
938 | a specially reserved region and then later executed after | ||
939 | a crash by kdump/kexec. The crash dump kernel must be compiled | ||
940 | to a memory address not used by the main kernel or BIOS using | ||
941 | PHYSICAL_START, or it must be built as a relocatable image | ||
942 | (CONFIG_RELOCATABLE=y). | ||
943 | For more details see Documentation/kdump/kdump.txt | ||
944 | |||
945 | config PHYSICAL_START | ||
946 | hex "Physical address where the kernel is loaded" if (EMBEDDED || CRASH_DUMP) | ||
947 | default "0x1000000" if X86_NUMAQ | ||
948 | default "0x200000" if X86_64 | ||
949 | default "0x100000" | ||
950 | help | ||
951 | This gives the physical address where the kernel is loaded. | ||
952 | |||
953 | If kernel is a not relocatable (CONFIG_RELOCATABLE=n) then | ||
954 | bzImage will decompress itself to above physical address and | ||
955 | run from there. Otherwise, bzImage will run from the address where | ||
956 | it has been loaded by the boot loader and will ignore above physical | ||
957 | address. | ||
958 | |||
959 | In normal kdump cases one does not have to set/change this option | ||
960 | as now bzImage can be compiled as a completely relocatable image | ||
961 | (CONFIG_RELOCATABLE=y) and be used to load and run from a different | ||
962 | address. This option is mainly useful for the folks who don't want | ||
963 | to use a bzImage for capturing the crash dump and want to use a | ||
964 | vmlinux instead. vmlinux is not relocatable hence a kernel needs | ||
965 | to be specifically compiled to run from a specific memory area | ||
966 | (normally a reserved region) and this option comes handy. | ||
967 | |||
968 | So if you are using bzImage for capturing the crash dump, leave | ||
969 | the value here unchanged to 0x100000 and set CONFIG_RELOCATABLE=y. | ||
970 | Otherwise if you plan to use vmlinux for capturing the crash dump | ||
971 | change this value to start of the reserved region (Typically 16MB | ||
972 | 0x1000000). In other words, it can be set based on the "X" value as | ||
973 | specified in the "crashkernel=YM@XM" command line boot parameter | ||
974 | passed to the panic-ed kernel. Typically this parameter is set as | ||
975 | crashkernel=64M@16M. Please take a look at | ||
976 | Documentation/kdump/kdump.txt for more details about crash dumps. | ||
977 | |||
978 | Usage of bzImage for capturing the crash dump is recommended as | ||
979 | one does not have to build two kernels. Same kernel can be used | ||
980 | as production kernel and capture kernel. Above option should have | ||
981 | gone away after relocatable bzImage support is introduced. But it | ||
982 | is present because there are users out there who continue to use | ||
983 | vmlinux for dump capture. This option should go away down the | ||
984 | line. | ||
985 | |||
986 | Don't change this unless you know what you are doing. | ||
987 | |||
988 | config RELOCATABLE | ||
989 | bool "Build a relocatable kernel (EXPERIMENTAL)" | ||
990 | depends on EXPERIMENTAL | ||
991 | help | ||
992 | This builds a kernel image that retains relocation information | ||
993 | so it can be loaded someplace besides the default 1MB. | ||
994 | The relocations tend to make the kernel binary about 10% larger, | ||
995 | but are discarded at runtime. | ||
996 | |||
997 | One use is for the kexec on panic case where the recovery kernel | ||
998 | must live at a different physical address than the primary | ||
999 | kernel. | ||
1000 | |||
1001 | Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address | ||
1002 | it has been loaded at and the compile time physical address | ||
1003 | (CONFIG_PHYSICAL_START) is ignored. | ||
1004 | |||
1005 | config PHYSICAL_ALIGN | ||
1006 | hex | ||
1007 | prompt "Alignment value to which kernel should be aligned" if X86_32 | ||
1008 | default "0x100000" if X86_32 | ||
1009 | default "0x200000" if X86_64 | ||
1010 | range 0x2000 0x400000 | ||
1011 | help | ||
1012 | This value puts the alignment restrictions on physical address | ||
1013 | where kernel is loaded and run from. Kernel is compiled for an | ||
1014 | address which meets above alignment restriction. | ||
1015 | |||
1016 | If bootloader loads the kernel at a non-aligned address and | ||
1017 | CONFIG_RELOCATABLE is set, kernel will move itself to nearest | ||
1018 | address aligned to above value and run from there. | ||
1019 | |||
1020 | If bootloader loads the kernel at a non-aligned address and | ||
1021 | CONFIG_RELOCATABLE is not set, kernel will ignore the run time | ||
1022 | load address and decompress itself to the address it has been | ||
1023 | compiled for and run from there. The address for which kernel is | ||
1024 | compiled already meets above alignment restrictions. Hence the | ||
1025 | end result is that kernel runs from a physical address meeting | ||
1026 | above alignment restrictions. | ||
1027 | |||
1028 | Don't change this unless you know what you are doing. | ||
1029 | |||
1030 | config HOTPLUG_CPU | ||
1031 | bool "Support for suspend on SMP and hot-pluggable CPUs (EXPERIMENTAL)" | ||
1032 | depends on SMP && HOTPLUG && EXPERIMENTAL && !X86_VOYAGER | ||
1033 | ---help--- | ||
1034 | Say Y here to experiment with turning CPUs off and on, and to | ||
1035 | enable suspend on SMP systems. CPUs can be controlled through | ||
1036 | /sys/devices/system/cpu. | ||
1037 | Say N if you want to disable CPU hotplug and don't need to | ||
1038 | suspend. | ||
1039 | |||
1040 | config COMPAT_VDSO | ||
1041 | bool "Compat VDSO support" | ||
1042 | default y | ||
1043 | depends on X86_32 | ||
1044 | help | ||
1045 | Map the VDSO to the predictable old-style address too. | ||
1046 | ---help--- | ||
1047 | Say N here if you are running a sufficiently recent glibc | ||
1048 | version (2.3.3 or later), to remove the high-mapped | ||
1049 | VDSO mapping and to exclusively use the randomized VDSO. | ||
1050 | |||
1051 | If unsure, say Y. | ||
1052 | |||
1053 | endmenu | ||
1054 | |||
1055 | config ARCH_ENABLE_MEMORY_HOTPLUG | ||
1056 | def_bool y | ||
1057 | depends on X86_64 || (X86_32 && HIGHMEM) | ||
1058 | |||
1059 | config MEMORY_HOTPLUG_RESERVE | ||
1060 | def_bool X86_64 | ||
1061 | depends on (MEMORY_HOTPLUG && DISCONTIGMEM) | ||
1062 | |||
1063 | config HAVE_ARCH_EARLY_PFN_TO_NID | ||
1064 | def_bool X86_64 | ||
1065 | depends on NUMA | ||
1066 | |||
1067 | config OUT_OF_LINE_PFN_TO_PAGE | ||
1068 | def_bool X86_64 | ||
1069 | depends on DISCONTIGMEM | ||
1070 | 17 | ||
1071 | source "arch/x86/Kconfig" | 18 | source "arch/x86/Kconfig" |