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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" | |
8f9ca475 | 8 | ---help--- |
daa93fab SR |
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 |
e17c6d56 | 21 | select HAVE_AOUT if X86_32 |
2c5643b1 HM |
22 | select HAVE_READQ |
23 | select HAVE_WRITEQ | |
a5574cf6 | 24 | select HAVE_UNSTABLE_SCHED_CLOCK |
ec7748b5 | 25 | select HAVE_IDE |
42d4b839 | 26 | select HAVE_OPROFILE |
28b2ee20 | 27 | select HAVE_IOREMAP_PROT |
3f550096 | 28 | select HAVE_KPROBES |
1f972768 | 29 | select ARCH_WANT_OPTIONAL_GPIOLIB |
da4276b8 | 30 | select ARCH_WANT_FRAME_POINTERS |
9edddaa2 | 31 | select HAVE_KRETPROBES |
e4b2b886 | 32 | select HAVE_FTRACE_MCOUNT_RECORD |
677aa9f7 | 33 | select HAVE_DYNAMIC_FTRACE |
606576ce | 34 | select HAVE_FUNCTION_TRACER |
48d68b20 | 35 | select HAVE_FUNCTION_GRAPH_TRACER |
60a7ecf4 | 36 | select HAVE_FUNCTION_TRACE_MCOUNT_TEST |
9a5fd902 | 37 | select HAVE_FTRACE_NMI_ENTER if DYNAMIC_FTRACE |
1b3fa2ce | 38 | select HAVE_FTRACE_SYSCALLS |
e0ec9483 | 39 | select HAVE_KVM |
49793b03 | 40 | select HAVE_ARCH_KGDB |
99bbc4b1 | 41 | select HAVE_ARCH_TRACEHOOK |
323ec001 | 42 | select HAVE_GENERIC_DMA_COHERENT if X86_32 |
58340a07 | 43 | select HAVE_EFFICIENT_UNALIGNED_ACCESS |
8d26487f | 44 | select USER_STACKTRACE_SUPPORT |
2118d0c5 | 45 | select HAVE_DMA_API_DEBUG |
2e9f3bdd PA |
46 | select HAVE_KERNEL_GZIP |
47 | select HAVE_KERNEL_BZIP2 | |
48 | select HAVE_KERNEL_LZMA | |
7d8330a5 | 49 | |
51b26ada LT |
50 | config OUTPUT_FORMAT |
51 | string | |
52 | default "elf32-i386" if X86_32 | |
53 | default "elf64-x86-64" if X86_64 | |
54 | ||
73531905 | 55 | config ARCH_DEFCONFIG |
b9b39bfb | 56 | string |
73531905 SR |
57 | default "arch/x86/configs/i386_defconfig" if X86_32 |
58 | default "arch/x86/configs/x86_64_defconfig" if X86_64 | |
b9b39bfb | 59 | |
8d5fffb9 | 60 | config GENERIC_TIME |
3c2362e6 | 61 | def_bool y |
8d5fffb9 SR |
62 | |
63 | config GENERIC_CMOS_UPDATE | |
3c2362e6 | 64 | def_bool y |
8d5fffb9 SR |
65 | |
66 | config CLOCKSOURCE_WATCHDOG | |
3c2362e6 | 67 | def_bool y |
8d5fffb9 SR |
68 | |
69 | config GENERIC_CLOCKEVENTS | |
3c2362e6 | 70 | def_bool y |
8d5fffb9 SR |
71 | |
72 | config GENERIC_CLOCKEVENTS_BROADCAST | |
3c2362e6 | 73 | def_bool y |
8d5fffb9 SR |
74 | depends on X86_64 || (X86_32 && X86_LOCAL_APIC) |
75 | ||
76 | config LOCKDEP_SUPPORT | |
3c2362e6 | 77 | def_bool y |
8d5fffb9 SR |
78 | |
79 | config STACKTRACE_SUPPORT | |
3c2362e6 | 80 | def_bool y |
8d5fffb9 | 81 | |
aa7d9350 HC |
82 | config HAVE_LATENCYTOP_SUPPORT |
83 | def_bool y | |
84 | ||
1f84260c CL |
85 | config FAST_CMPXCHG_LOCAL |
86 | bool | |
87 | default y | |
88 | ||
8d5fffb9 | 89 | config MMU |
3c2362e6 | 90 | def_bool y |
8d5fffb9 SR |
91 | |
92 | config ZONE_DMA | |
3c2362e6 | 93 | def_bool y |
8d5fffb9 | 94 | |
8d5fffb9 SR |
95 | config SBUS |
96 | bool | |
97 | ||
98 | config GENERIC_ISA_DMA | |
3c2362e6 | 99 | def_bool y |
8d5fffb9 SR |
100 | |
101 | config GENERIC_IOMAP | |
3c2362e6 | 102 | def_bool y |
8d5fffb9 SR |
103 | |
104 | config GENERIC_BUG | |
3c2362e6 | 105 | def_bool y |
8d5fffb9 | 106 | depends on BUG |
b93a531e JB |
107 | select GENERIC_BUG_RELATIVE_POINTERS if X86_64 |
108 | ||
109 | config GENERIC_BUG_RELATIVE_POINTERS | |
110 | bool | |
8d5fffb9 SR |
111 | |
112 | config GENERIC_HWEIGHT | |
3c2362e6 | 113 | def_bool y |
8d5fffb9 | 114 | |
a6082959 | 115 | config GENERIC_GPIO |
9ba16087 | 116 | bool |
a6082959 | 117 | |
8d5fffb9 | 118 | config ARCH_MAY_HAVE_PC_FDC |
3c2362e6 | 119 | def_bool y |
8d5fffb9 | 120 | |
1032c0ba SR |
121 | config RWSEM_GENERIC_SPINLOCK |
122 | def_bool !X86_XADD | |
123 | ||
124 | config RWSEM_XCHGADD_ALGORITHM | |
125 | def_bool X86_XADD | |
126 | ||
a6869cc4 VP |
127 | config ARCH_HAS_CPU_IDLE_WAIT |
128 | def_bool y | |
129 | ||
1032c0ba SR |
130 | config GENERIC_CALIBRATE_DELAY |
131 | def_bool y | |
132 | ||
8d5fffb9 SR |
133 | config GENERIC_TIME_VSYSCALL |
134 | bool | |
135 | default X86_64 | |
136 | ||
9a0b8415 | 137 | config ARCH_HAS_CPU_RELAX |
138 | def_bool y | |
139 | ||
89cedfef VP |
140 | config ARCH_HAS_DEFAULT_IDLE |
141 | def_bool y | |
142 | ||
1b27d05b PE |
143 | config ARCH_HAS_CACHE_LINE_SIZE |
144 | def_bool y | |
145 | ||
dd5af90a | 146 | config HAVE_SETUP_PER_CPU_AREA |
89c9c4c5 | 147 | def_bool y |
b32ef636 | 148 | |
11124411 TH |
149 | config HAVE_DYNAMIC_PER_CPU_AREA |
150 | def_bool y | |
151 | ||
9f0e8d04 MT |
152 | config HAVE_CPUMASK_OF_CPU_MAP |
153 | def_bool X86_64_SMP | |
154 | ||
801e4062 JB |
155 | config ARCH_HIBERNATION_POSSIBLE |
156 | def_bool y | |
801e4062 | 157 | |
f4cb5700 JB |
158 | config ARCH_SUSPEND_POSSIBLE |
159 | def_bool y | |
f4cb5700 | 160 | |
8d5fffb9 SR |
161 | config ZONE_DMA32 |
162 | bool | |
163 | default X86_64 | |
164 | ||
165 | config ARCH_POPULATES_NODE_MAP | |
166 | def_bool y | |
167 | ||
168 | config AUDIT_ARCH | |
169 | bool | |
170 | default X86_64 | |
171 | ||
765c68bd IM |
172 | config ARCH_SUPPORTS_OPTIMIZED_INLINING |
173 | def_bool y | |
174 | ||
6a11f75b AM |
175 | config ARCH_SUPPORTS_DEBUG_PAGEALLOC |
176 | def_bool y | |
177 | ||
8d5fffb9 SR |
178 | # Use the generic interrupt handling code in kernel/irq/: |
179 | config GENERIC_HARDIRQS | |
180 | bool | |
181 | default y | |
182 | ||
f9a36fa5 TG |
183 | config GENERIC_HARDIRQS_NO__DO_IRQ |
184 | def_bool y | |
185 | ||
8d5fffb9 SR |
186 | config GENERIC_IRQ_PROBE |
187 | bool | |
188 | default y | |
189 | ||
190 | config GENERIC_PENDING_IRQ | |
191 | bool | |
192 | depends on GENERIC_HARDIRQS && SMP | |
193 | default y | |
194 | ||
6cd10f8d JB |
195 | config USE_GENERIC_SMP_HELPERS |
196 | def_bool y | |
197 | depends on SMP | |
198 | ||
6b0c3d44 SR |
199 | config X86_32_SMP |
200 | def_bool y | |
201 | depends on X86_32 && SMP | |
202 | ||
203 | config X86_64_SMP | |
204 | def_bool y | |
205 | depends on X86_64 && SMP | |
206 | ||
8d5fffb9 SR |
207 | config X86_HT |
208 | bool | |
ee0011a7 | 209 | depends on SMP |
8d5fffb9 SR |
210 | default y |
211 | ||
212 | config X86_TRAMPOLINE | |
213 | bool | |
3e5095d1 | 214 | depends on SMP || (64BIT && ACPI_SLEEP) |
8d5fffb9 SR |
215 | default y |
216 | ||
ccbeed3a TH |
217 | config X86_32_LAZY_GS |
218 | def_bool y | |
60a5317f | 219 | depends on X86_32 && !CC_STACKPROTECTOR |
ccbeed3a | 220 | |
8d5fffb9 SR |
221 | config KTIME_SCALAR |
222 | def_bool X86_32 | |
506f1d07 | 223 | source "init/Kconfig" |
dc52ddc0 | 224 | source "kernel/Kconfig.freezer" |
8d5fffb9 | 225 | |
506f1d07 SR |
226 | menu "Processor type and features" |
227 | ||
228 | source "kernel/time/Kconfig" | |
229 | ||
230 | config SMP | |
231 | bool "Symmetric multi-processing support" | |
232 | ---help--- | |
233 | This enables support for systems with more than one CPU. If you have | |
234 | a system with only one CPU, like most personal computers, say N. If | |
235 | you have a system with more than one CPU, say Y. | |
236 | ||
237 | If you say N here, the kernel will run on single and multiprocessor | |
238 | machines, but will use only one CPU of a multiprocessor machine. If | |
239 | you say Y here, the kernel will run on many, but not all, | |
240 | singleprocessor machines. On a singleprocessor machine, the kernel | |
241 | will run faster if you say N here. | |
242 | ||
243 | Note that if you say Y here and choose architecture "586" or | |
244 | "Pentium" under "Processor family", the kernel will not work on 486 | |
245 | architectures. Similarly, multiprocessor kernels for the "PPro" | |
246 | architecture may not work on all Pentium based boards. | |
247 | ||
248 | People using multiprocessor machines who say Y here should also say | |
249 | Y to "Enhanced Real Time Clock Support", below. The "Advanced Power | |
250 | Management" code will be disabled if you say Y here. | |
251 | ||
03502faa | 252 | See also <file:Documentation/i386/IO-APIC.txt>, |
506f1d07 SR |
253 | <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at |
254 | <http://www.tldp.org/docs.html#howto>. | |
255 | ||
256 | If you don't know what to do here, say N. | |
257 | ||
06cd9a7d YL |
258 | config X86_X2APIC |
259 | bool "Support x2apic" | |
f7d7f866 | 260 | depends on X86_LOCAL_APIC && X86_64 && INTR_REMAP |
06cd9a7d YL |
261 | ---help--- |
262 | This enables x2apic support on CPUs that have this feature. | |
263 | ||
264 | This allows 32-bit apic IDs (so it can support very large systems), | |
265 | and accesses the local apic via MSRs not via mmio. | |
266 | ||
06cd9a7d YL |
267 | If you don't know what to do here, say N. |
268 | ||
0b8f1efa YL |
269 | config SPARSE_IRQ |
270 | bool "Support sparse irq numbering" | |
17483a1f | 271 | depends on PCI_MSI || HT_IRQ |
8f9ca475 | 272 | ---help--- |
973656fe IM |
273 | This enables support for sparse irqs. This is useful for distro |
274 | kernels that want to define a high CONFIG_NR_CPUS value but still | |
275 | want to have low kernel memory footprint on smaller machines. | |
0b8f1efa | 276 | |
973656fe IM |
277 | ( Sparse IRQs can also be beneficial on NUMA boxes, as they spread |
278 | out the irq_desc[] array in a more NUMA-friendly way. ) | |
279 | ||
280 | If you don't know what to do here, say N. | |
0b8f1efa | 281 | |
15e957d0 YL |
282 | config NUMA_IRQ_DESC |
283 | def_bool y | |
b9098957 | 284 | depends on SPARSE_IRQ && NUMA |
48a1b10a | 285 | |
6695c85b | 286 | config X86_MPPARSE |
7a527688 JB |
287 | bool "Enable MPS table" if ACPI |
288 | default y | |
5ab74722 | 289 | depends on X86_LOCAL_APIC |
8f9ca475 | 290 | ---help--- |
6695c85b YL |
291 | For old smp systems that do not have proper acpi support. Newer systems |
292 | (esp with 64bit cpus) with acpi support, MADT and DSDT will override it | |
6695c85b | 293 | |
26f7ef14 YL |
294 | config X86_BIGSMP |
295 | bool "Support for big SMP systems with more than 8 CPUs" | |
296 | depends on X86_32 && SMP | |
8f9ca475 | 297 | ---help--- |
26f7ef14 | 298 | This option is needed for the systems that have more than 8 CPUs |
506f1d07 | 299 | |
8425091f | 300 | if X86_32 |
c5c606d9 RT |
301 | config X86_EXTENDED_PLATFORM |
302 | bool "Support for extended (non-PC) x86 platforms" | |
303 | default y | |
8f9ca475 | 304 | ---help--- |
06ac8346 IM |
305 | If you disable this option then the kernel will only support |
306 | standard PC platforms. (which covers the vast majority of | |
307 | systems out there.) | |
308 | ||
8425091f RT |
309 | If you enable this option then you'll be able to select support |
310 | for the following (non-PC) 32 bit x86 platforms: | |
311 | AMD Elan | |
312 | NUMAQ (IBM/Sequent) | |
313 | RDC R-321x SoC | |
314 | SGI 320/540 (Visual Workstation) | |
315 | Summit/EXA (IBM x440) | |
316 | Unisys ES7000 IA32 series | |
06ac8346 IM |
317 | |
318 | If you have one of these systems, or if you want to build a | |
319 | generic distribution kernel, say Y here - otherwise say N. | |
8425091f | 320 | endif |
06ac8346 | 321 | |
8425091f RT |
322 | if X86_64 |
323 | config X86_EXTENDED_PLATFORM | |
324 | bool "Support for extended (non-PC) x86 platforms" | |
325 | default y | |
326 | ---help--- | |
327 | If you disable this option then the kernel will only support | |
328 | standard PC platforms. (which covers the vast majority of | |
329 | systems out there.) | |
330 | ||
331 | If you enable this option then you'll be able to select support | |
332 | for the following (non-PC) 64 bit x86 platforms: | |
333 | ScaleMP vSMP | |
334 | SGI Ultraviolet | |
335 | ||
336 | If you have one of these systems, or if you want to build a | |
337 | generic distribution kernel, say Y here - otherwise say N. | |
338 | endif | |
c5c606d9 RT |
339 | # This is an alphabetically sorted list of 64 bit extended platforms |
340 | # Please maintain the alphabetic order if and when there are additions | |
506f1d07 | 341 | |
c5c606d9 RT |
342 | config X86_VSMP |
343 | bool "ScaleMP vSMP" | |
344 | select PARAVIRT | |
345 | depends on X86_64 && PCI | |
346 | depends on X86_EXTENDED_PLATFORM | |
8f9ca475 | 347 | ---help--- |
c5c606d9 RT |
348 | Support for ScaleMP vSMP systems. Say 'Y' here if this kernel is |
349 | supposed to run on these EM64T-based machines. Only choose this option | |
350 | if you have one of these machines. | |
5e3a77e9 | 351 | |
03b48632 NP |
352 | config X86_UV |
353 | bool "SGI Ultraviolet" | |
354 | depends on X86_64 | |
c5c606d9 | 355 | depends on X86_EXTENDED_PLATFORM |
54c28d29 | 356 | depends on NUMA |
9d6c26e7 | 357 | depends on X86_X2APIC |
8f9ca475 | 358 | ---help--- |
03b48632 NP |
359 | This option is needed in order to support SGI Ultraviolet systems. |
360 | If you don't have one of these, you should say N here. | |
361 | ||
c5c606d9 RT |
362 | # Following is an alphabetically sorted list of 32 bit extended platforms |
363 | # Please maintain the alphabetic order if and when there are additions | |
506f1d07 SR |
364 | |
365 | config X86_ELAN | |
366 | bool "AMD Elan" | |
367 | depends on X86_32 | |
c5c606d9 | 368 | depends on X86_EXTENDED_PLATFORM |
8f9ca475 | 369 | ---help--- |
506f1d07 SR |
370 | Select this for an AMD Elan processor. |
371 | ||
372 | Do not use this option for K6/Athlon/Opteron processors! | |
373 | ||
374 | If unsure, choose "PC-compatible" instead. | |
375 | ||
c5c606d9 RT |
376 | config X86_RDC321X |
377 | bool "RDC R-321x SoC" | |
506f1d07 | 378 | depends on X86_32 |
c5c606d9 RT |
379 | depends on X86_EXTENDED_PLATFORM |
380 | select M486 | |
381 | select X86_REBOOTFIXUPS | |
382 | ---help--- | |
383 | This option is needed for RDC R-321x system-on-chip, also known | |
384 | as R-8610-(G). | |
385 | If you don't have one of these chips, you should say N here. | |
386 | ||
e0c7ae37 | 387 | config X86_32_NON_STANDARD |
9c398017 IM |
388 | bool "Support non-standard 32-bit SMP architectures" |
389 | depends on X86_32 && SMP | |
c5c606d9 | 390 | depends on X86_EXTENDED_PLATFORM |
8f9ca475 IM |
391 | ---help--- |
392 | This option compiles in the NUMAQ, Summit, bigsmp, ES7000, default | |
d49c4288 YL |
393 | subarchitectures. It is intended for a generic binary kernel. |
394 | if you select them all, kernel will probe it one by one. and will | |
395 | fallback to default. | |
396 | ||
c5c606d9 | 397 | # Alphabetically sorted list of Non standard 32 bit platforms |
d49c4288 | 398 | |
506f1d07 SR |
399 | config X86_NUMAQ |
400 | bool "NUMAQ (IBM/Sequent)" | |
e0c7ae37 | 401 | depends on X86_32_NON_STANDARD |
506f1d07 | 402 | select NUMA |
9c398017 | 403 | select X86_MPPARSE |
8f9ca475 | 404 | ---help--- |
d49c4288 YL |
405 | This option is used for getting Linux to run on a NUMAQ (IBM/Sequent) |
406 | NUMA multiquad box. This changes the way that processors are | |
407 | bootstrapped, and uses Clustered Logical APIC addressing mode instead | |
408 | of Flat Logical. You will need a new lynxer.elf file to flash your | |
409 | firmware with - send email to <Martin.Bligh@us.ibm.com>. | |
506f1d07 | 410 | |
1b84e1c8 IM |
411 | config X86_VISWS |
412 | bool "SGI 320/540 (Visual Workstation)" | |
c5c606d9 RT |
413 | depends on X86_32 && PCI && X86_MPPARSE && PCI_GODIRECT |
414 | depends on X86_32_NON_STANDARD | |
415 | ---help--- | |
1b84e1c8 IM |
416 | The SGI Visual Workstation series is an IA32-based workstation |
417 | based on SGI systems chips with some legacy PC hardware attached. | |
418 | ||
419 | Say Y here to create a kernel to run on the SGI 320 or 540. | |
420 | ||
421 | A kernel compiled for the Visual Workstation will run on general | |
422 | PCs as well. See <file:Documentation/sgi-visws.txt> for details. | |
423 | ||
9c398017 IM |
424 | config X86_SUMMIT |
425 | bool "Summit/EXA (IBM x440)" | |
e0c7ae37 | 426 | depends on X86_32_NON_STANDARD |
8f9ca475 | 427 | ---help--- |
9c398017 IM |
428 | This option is needed for IBM systems that use the Summit/EXA chipset. |
429 | In particular, it is needed for the x440. | |
1f972768 | 430 | |
9c398017 | 431 | config X86_ES7000 |
c5c606d9 | 432 | bool "Unisys ES7000 IA32 series" |
26f7ef14 | 433 | depends on X86_32_NON_STANDARD && X86_BIGSMP |
8f9ca475 | 434 | ---help--- |
9c398017 IM |
435 | Support for Unisys ES7000 systems. Say 'Y' here if this kernel is |
436 | supposed to run on an IA32-based Unisys ES7000 system. | |
437 | ||
ae1e9130 | 438 | config SCHED_OMIT_FRAME_POINTER |
3c2362e6 HH |
439 | def_bool y |
440 | prompt "Single-depth WCHAN output" | |
a87d0914 | 441 | depends on X86 |
8f9ca475 | 442 | ---help--- |
506f1d07 SR |
443 | Calculate simpler /proc/<PID>/wchan values. If this option |
444 | is disabled then wchan values will recurse back to the | |
445 | caller function. This provides more accurate wchan values, | |
446 | at the expense of slightly more scheduling overhead. | |
447 | ||
448 | If in doubt, say "Y". | |
449 | ||
506f1d07 SR |
450 | menuconfig PARAVIRT_GUEST |
451 | bool "Paravirtualized guest support" | |
8f9ca475 | 452 | ---help--- |
506f1d07 SR |
453 | Say Y here to get to see options related to running Linux under |
454 | various hypervisors. This option alone does not add any kernel code. | |
455 | ||
456 | If you say N, all options in this submenu will be skipped and disabled. | |
457 | ||
458 | if PARAVIRT_GUEST | |
459 | ||
460 | source "arch/x86/xen/Kconfig" | |
461 | ||
462 | config VMI | |
463 | bool "VMI Guest support" | |
464 | select PARAVIRT | |
42d545c9 | 465 | depends on X86_32 |
8f9ca475 | 466 | ---help--- |
506f1d07 SR |
467 | VMI provides a paravirtualized interface to the VMware ESX server |
468 | (it could be used by other hypervisors in theory too, but is not | |
469 | at the moment), by linking the kernel to a GPL-ed ROM module | |
470 | provided by the hypervisor. | |
471 | ||
790c73f6 GOC |
472 | config KVM_CLOCK |
473 | bool "KVM paravirtualized clock" | |
474 | select PARAVIRT | |
f6e16d5a | 475 | select PARAVIRT_CLOCK |
8f9ca475 | 476 | ---help--- |
790c73f6 GOC |
477 | Turning on this option will allow you to run a paravirtualized clock |
478 | when running over the KVM hypervisor. Instead of relying on a PIT | |
479 | (or probably other) emulation by the underlying device model, the host | |
480 | provides the guest with timing infrastructure such as time of day, and | |
481 | system time | |
482 | ||
0cf1bfd2 MT |
483 | config KVM_GUEST |
484 | bool "KVM Guest support" | |
485 | select PARAVIRT | |
8f9ca475 IM |
486 | ---help--- |
487 | This option enables various optimizations for running under the KVM | |
488 | hypervisor. | |
0cf1bfd2 | 489 | |
506f1d07 SR |
490 | source "arch/x86/lguest/Kconfig" |
491 | ||
e61bd94a EPH |
492 | config PARAVIRT |
493 | bool "Enable paravirtualization code" | |
8f9ca475 | 494 | ---help--- |
e61bd94a EPH |
495 | This changes the kernel so it can modify itself when it is run |
496 | under a hypervisor, potentially improving performance significantly | |
497 | over full virtualization. However, when run without a hypervisor | |
498 | the kernel is theoretically slower and slightly larger. | |
499 | ||
b4ecc126 JF |
500 | config PARAVIRT_SPINLOCKS |
501 | bool "Paravirtualization layer for spinlocks" | |
502 | depends on PARAVIRT && SMP && EXPERIMENTAL | |
503 | ---help--- | |
504 | Paravirtualized spinlocks allow a pvops backend to replace the | |
505 | spinlock implementation with something virtualization-friendly | |
506 | (for example, block the virtual CPU rather than spinning). | |
507 | ||
508 | Unfortunately the downside is an up to 5% performance hit on | |
509 | native kernels, with various workloads. | |
510 | ||
511 | If you are unsure how to answer this question, answer N. | |
512 | ||
7af192c9 GH |
513 | config PARAVIRT_CLOCK |
514 | bool | |
515 | default n | |
516 | ||
506f1d07 SR |
517 | endif |
518 | ||
97349135 | 519 | config PARAVIRT_DEBUG |
8f9ca475 IM |
520 | bool "paravirt-ops debugging" |
521 | depends on PARAVIRT && DEBUG_KERNEL | |
522 | ---help--- | |
523 | Enable to debug paravirt_ops internals. Specifically, BUG if | |
524 | a paravirt_op is missing when it is called. | |
97349135 | 525 | |
03273184 YL |
526 | config MEMTEST |
527 | bool "Memtest" | |
8f9ca475 | 528 | ---help--- |
c64df707 | 529 | This option adds a kernel parameter 'memtest', which allows memtest |
03273184 | 530 | to be set. |
8f9ca475 IM |
531 | memtest=0, mean disabled; -- default |
532 | memtest=1, mean do 1 test pattern; | |
533 | ... | |
534 | memtest=4, mean do 4 test patterns. | |
aba3728c | 535 | If you are unsure how to answer this question, answer N. |
506f1d07 SR |
536 | |
537 | config X86_SUMMIT_NUMA | |
3c2362e6 | 538 | def_bool y |
e0c7ae37 | 539 | depends on X86_32 && NUMA && X86_32_NON_STANDARD |
506f1d07 SR |
540 | |
541 | config X86_CYCLONE_TIMER | |
3c2362e6 | 542 | def_bool y |
e0c7ae37 | 543 | depends on X86_32_NON_STANDARD |
506f1d07 | 544 | |
506f1d07 SR |
545 | source "arch/x86/Kconfig.cpu" |
546 | ||
547 | config HPET_TIMER | |
3c2362e6 | 548 | def_bool X86_64 |
506f1d07 | 549 | prompt "HPET Timer Support" if X86_32 |
8f9ca475 IM |
550 | ---help--- |
551 | Use the IA-PC HPET (High Precision Event Timer) to manage | |
552 | time in preference to the PIT and RTC, if a HPET is | |
553 | present. | |
554 | HPET is the next generation timer replacing legacy 8254s. | |
555 | The HPET provides a stable time base on SMP | |
556 | systems, unlike the TSC, but it is more expensive to access, | |
557 | as it is off-chip. You can find the HPET spec at | |
558 | <http://www.intel.com/hardwaredesign/hpetspec_1.pdf>. | |
506f1d07 | 559 | |
8f9ca475 IM |
560 | You can safely choose Y here. However, HPET will only be |
561 | activated if the platform and the BIOS support this feature. | |
562 | Otherwise the 8254 will be used for timing services. | |
506f1d07 | 563 | |
8f9ca475 | 564 | Choose N to continue using the legacy 8254 timer. |
506f1d07 SR |
565 | |
566 | config HPET_EMULATE_RTC | |
3c2362e6 | 567 | def_bool y |
9d8af78b | 568 | depends on HPET_TIMER && (RTC=y || RTC=m || RTC_DRV_CMOS=m || RTC_DRV_CMOS=y) |
506f1d07 SR |
569 | |
570 | # Mark as embedded because too many people got it wrong. | |
571 | # The code disables itself when not needed. | |
7ae9392c TP |
572 | config DMI |
573 | default y | |
574 | bool "Enable DMI scanning" if EMBEDDED | |
8f9ca475 | 575 | ---help--- |
7ae9392c TP |
576 | Enabled scanning of DMI to identify machine quirks. Say Y |
577 | here unless you have verified that your setup is not | |
578 | affected by entries in the DMI blacklist. Required by PNP | |
579 | BIOS code. | |
580 | ||
506f1d07 SR |
581 | config GART_IOMMU |
582 | bool "GART IOMMU support" if EMBEDDED | |
583 | default y | |
584 | select SWIOTLB | |
585 | select AGP | |
586 | depends on X86_64 && PCI | |
8f9ca475 | 587 | ---help--- |
506f1d07 SR |
588 | Support for full DMA access of devices with 32bit memory access only |
589 | on systems with more than 3GB. This is usually needed for USB, | |
590 | sound, many IDE/SATA chipsets and some other devices. | |
591 | Provides a driver for the AMD Athlon64/Opteron/Turion/Sempron GART | |
592 | based hardware IOMMU and a software bounce buffer based IOMMU used | |
593 | on Intel systems and as fallback. | |
594 | The code is only active when needed (enough memory and limited | |
595 | device) unless CONFIG_IOMMU_DEBUG or iommu=force is specified | |
596 | too. | |
597 | ||
598 | config CALGARY_IOMMU | |
599 | bool "IBM Calgary IOMMU support" | |
600 | select SWIOTLB | |
601 | depends on X86_64 && PCI && EXPERIMENTAL | |
8f9ca475 | 602 | ---help--- |
506f1d07 SR |
603 | Support for hardware IOMMUs in IBM's xSeries x366 and x460 |
604 | systems. Needed to run systems with more than 3GB of memory | |
605 | properly with 32-bit PCI devices that do not support DAC | |
606 | (Double Address Cycle). Calgary also supports bus level | |
607 | isolation, where all DMAs pass through the IOMMU. This | |
608 | prevents them from going anywhere except their intended | |
609 | destination. This catches hard-to-find kernel bugs and | |
610 | mis-behaving drivers and devices that do not use the DMA-API | |
611 | properly to set up their DMA buffers. The IOMMU can be | |
612 | turned off at boot time with the iommu=off parameter. | |
613 | Normally the kernel will make the right choice by itself. | |
614 | If unsure, say Y. | |
615 | ||
616 | config CALGARY_IOMMU_ENABLED_BY_DEFAULT | |
3c2362e6 HH |
617 | def_bool y |
618 | prompt "Should Calgary be enabled by default?" | |
506f1d07 | 619 | depends on CALGARY_IOMMU |
8f9ca475 | 620 | ---help--- |
506f1d07 SR |
621 | Should Calgary be enabled by default? if you choose 'y', Calgary |
622 | will be used (if it exists). If you choose 'n', Calgary will not be | |
623 | used even if it exists. If you choose 'n' and would like to use | |
624 | Calgary anyway, pass 'iommu=calgary' on the kernel command line. | |
625 | If unsure, say Y. | |
626 | ||
2b188723 JR |
627 | config AMD_IOMMU |
628 | bool "AMD IOMMU support" | |
07c40e8a | 629 | select SWIOTLB |
a80dc3e0 | 630 | select PCI_MSI |
24d2ba0a | 631 | depends on X86_64 && PCI && ACPI |
8f9ca475 | 632 | ---help--- |
18d22200 JR |
633 | With this option you can enable support for AMD IOMMU hardware in |
634 | your system. An IOMMU is a hardware component which provides | |
635 | remapping of DMA memory accesses from devices. With an AMD IOMMU you | |
636 | can isolate the the DMA memory of different devices and protect the | |
637 | system from misbehaving device drivers or hardware. | |
638 | ||
639 | You can find out if your system has an AMD IOMMU if you look into | |
640 | your BIOS for an option to enable it or if you have an IVRS ACPI | |
641 | table. | |
2b188723 | 642 | |
2e117604 JR |
643 | config AMD_IOMMU_STATS |
644 | bool "Export AMD IOMMU statistics to debugfs" | |
645 | depends on AMD_IOMMU | |
646 | select DEBUG_FS | |
8f9ca475 | 647 | ---help--- |
2e117604 JR |
648 | This option enables code in the AMD IOMMU driver to collect various |
649 | statistics about whats happening in the driver and exports that | |
650 | information to userspace via debugfs. | |
651 | If unsure, say N. | |
652 | ||
506f1d07 SR |
653 | # need this always selected by IOMMU for the VIA workaround |
654 | config SWIOTLB | |
a1afd01c | 655 | def_bool y if X86_64 |
8f9ca475 | 656 | ---help--- |
506f1d07 SR |
657 | Support for software bounce buffers used on x86-64 systems |
658 | which don't have a hardware IOMMU (e.g. the current generation | |
659 | of Intel's x86-64 CPUs). Using this PCI devices which can only | |
660 | access 32-bits of memory can be used on systems with more than | |
661 | 3 GB of memory. If unsure, say Y. | |
662 | ||
a8522509 | 663 | config IOMMU_HELPER |
18b743dc | 664 | def_bool (CALGARY_IOMMU || GART_IOMMU || SWIOTLB || AMD_IOMMU) |
d25e26b6 | 665 | |
1aaf1183 JR |
666 | config IOMMU_API |
667 | def_bool (AMD_IOMMU || DMAR) | |
668 | ||
1184dc2f MT |
669 | config MAXSMP |
670 | bool "Configure Maximum number of SMP Processors and NUMA Nodes" | |
36f5101a MT |
671 | depends on X86_64 && SMP && DEBUG_KERNEL && EXPERIMENTAL |
672 | select CPUMASK_OFFSTACK | |
1184dc2f | 673 | default n |
8f9ca475 | 674 | ---help--- |
1184dc2f MT |
675 | Configure maximum number of CPUS and NUMA Nodes for this architecture. |
676 | If unsure, say N. | |
506f1d07 SR |
677 | |
678 | config NR_CPUS | |
36f5101a | 679 | int "Maximum number of CPUs" if SMP && !MAXSMP |
2a3313f4 | 680 | range 2 8 if SMP && X86_32 && !X86_BIGSMP |
36f5101a | 681 | range 2 512 if SMP && !MAXSMP |
78637a97 | 682 | default "1" if !SMP |
d25e26b6 | 683 | default "4096" if MAXSMP |
78637a97 MT |
684 | default "32" if SMP && (X86_NUMAQ || X86_SUMMIT || X86_BIGSMP || X86_ES7000) |
685 | default "8" if SMP | |
8f9ca475 | 686 | ---help--- |
506f1d07 | 687 | This allows you to specify the maximum number of CPUs which this |
d25e26b6 | 688 | kernel will support. The maximum supported value is 512 and the |
506f1d07 SR |
689 | minimum value which makes sense is 2. |
690 | ||
691 | This is purely to save memory - each supported CPU adds | |
692 | approximately eight kilobytes to the kernel image. | |
693 | ||
694 | config SCHED_SMT | |
695 | bool "SMT (Hyperthreading) scheduler support" | |
b089c12b | 696 | depends on X86_HT |
8f9ca475 | 697 | ---help--- |
506f1d07 SR |
698 | SMT scheduler support improves the CPU scheduler's decision making |
699 | when dealing with Intel Pentium 4 chips with HyperThreading at a | |
700 | cost of slightly increased overhead in some places. If unsure say | |
701 | N here. | |
702 | ||
703 | config SCHED_MC | |
3c2362e6 HH |
704 | def_bool y |
705 | prompt "Multi-core scheduler support" | |
b089c12b | 706 | depends on X86_HT |
8f9ca475 | 707 | ---help--- |
506f1d07 SR |
708 | Multi-core scheduler support improves the CPU scheduler's decision |
709 | making when dealing with multi-core CPU chips at a cost of slightly | |
710 | increased overhead in some places. If unsure say N here. | |
711 | ||
712 | source "kernel/Kconfig.preempt" | |
713 | ||
714 | config X86_UP_APIC | |
715 | bool "Local APIC support on uniprocessors" | |
e0c7ae37 | 716 | depends on X86_32 && !SMP && !X86_32_NON_STANDARD |
8f9ca475 | 717 | ---help--- |
506f1d07 SR |
718 | A local APIC (Advanced Programmable Interrupt Controller) is an |
719 | integrated interrupt controller in the CPU. If you have a single-CPU | |
720 | system which has a processor with a local APIC, you can say Y here to | |
721 | enable and use it. If you say Y here even though your machine doesn't | |
722 | have a local APIC, then the kernel will still run with no slowdown at | |
723 | all. The local APIC supports CPU-generated self-interrupts (timer, | |
724 | performance counters), and the NMI watchdog which detects hard | |
725 | lockups. | |
726 | ||
727 | config X86_UP_IOAPIC | |
728 | bool "IO-APIC support on uniprocessors" | |
729 | depends on X86_UP_APIC | |
8f9ca475 | 730 | ---help--- |
506f1d07 SR |
731 | An IO-APIC (I/O Advanced Programmable Interrupt Controller) is an |
732 | SMP-capable replacement for PC-style interrupt controllers. Most | |
733 | SMP systems and many recent uniprocessor systems have one. | |
734 | ||
735 | If you have a single-CPU system with an IO-APIC, you can say Y here | |
736 | to use it. If you say Y here even though your machine doesn't have | |
737 | an IO-APIC, then the kernel will still run with no slowdown at all. | |
738 | ||
739 | config X86_LOCAL_APIC | |
3c2362e6 | 740 | def_bool y |
e0c7ae37 | 741 | depends on X86_64 || SMP || X86_32_NON_STANDARD || X86_UP_APIC |
ee06094f | 742 | select HAVE_PERF_COUNTERS if (!M386 && !M486) |
506f1d07 SR |
743 | |
744 | config X86_IO_APIC | |
3c2362e6 | 745 | def_bool y |
e0c7ae37 | 746 | depends on X86_64 || SMP || X86_32_NON_STANDARD || X86_UP_APIC |
506f1d07 SR |
747 | |
748 | config X86_VISWS_APIC | |
3c2362e6 | 749 | def_bool y |
506f1d07 | 750 | depends on X86_32 && X86_VISWS |
506f1d07 | 751 | |
41b9eb26 SA |
752 | config X86_REROUTE_FOR_BROKEN_BOOT_IRQS |
753 | bool "Reroute for broken boot IRQs" | |
754 | default n | |
755 | depends on X86_IO_APIC | |
8f9ca475 | 756 | ---help--- |
41b9eb26 SA |
757 | This option enables a workaround that fixes a source of |
758 | spurious interrupts. This is recommended when threaded | |
759 | interrupt handling is used on systems where the generation of | |
760 | superfluous "boot interrupts" cannot be disabled. | |
761 | ||
762 | Some chipsets generate a legacy INTx "boot IRQ" when the IRQ | |
763 | entry in the chipset's IO-APIC is masked (as, e.g. the RT | |
764 | kernel does during interrupt handling). On chipsets where this | |
765 | boot IRQ generation cannot be disabled, this workaround keeps | |
766 | the original IRQ line masked so that only the equivalent "boot | |
767 | IRQ" is delivered to the CPUs. The workaround also tells the | |
768 | kernel to set up the IRQ handler on the boot IRQ line. In this | |
769 | way only one interrupt is delivered to the kernel. Otherwise | |
770 | the spurious second interrupt may cause the kernel to bring | |
771 | down (vital) interrupt lines. | |
772 | ||
773 | Only affects "broken" chipsets. Interrupt sharing may be | |
774 | increased on these systems. | |
775 | ||
506f1d07 SR |
776 | config X86_MCE |
777 | bool "Machine Check Exception" | |
506f1d07 SR |
778 | ---help--- |
779 | Machine Check Exception support allows the processor to notify the | |
780 | kernel if it detects a problem (e.g. overheating, component failure). | |
781 | The action the kernel takes depends on the severity of the problem, | |
782 | ranging from a warning message on the console, to halting the machine. | |
783 | Your processor must be a Pentium or newer to support this - check the | |
784 | flags in /proc/cpuinfo for mce. Note that some older Pentium systems | |
785 | have a design flaw which leads to false MCE events - hence MCE is | |
786 | disabled on all P5 processors, unless explicitly enabled with "mce" | |
787 | as a boot argument. Similarly, if MCE is built in and creates a | |
788 | problem on some new non-standard machine, you can boot with "nomce" | |
789 | to disable it. MCE support simply ignores non-MCE processors like | |
790 | the 386 and 486, so nearly everyone can say Y here. | |
791 | ||
792 | config X86_MCE_INTEL | |
3c2362e6 HH |
793 | def_bool y |
794 | prompt "Intel MCE features" | |
506f1d07 | 795 | depends on X86_64 && X86_MCE && X86_LOCAL_APIC |
8f9ca475 | 796 | ---help--- |
506f1d07 SR |
797 | Additional support for intel specific MCE features such as |
798 | the thermal monitor. | |
799 | ||
800 | config X86_MCE_AMD | |
3c2362e6 HH |
801 | def_bool y |
802 | prompt "AMD MCE features" | |
506f1d07 | 803 | depends on X86_64 && X86_MCE && X86_LOCAL_APIC |
8f9ca475 | 804 | ---help--- |
506f1d07 SR |
805 | Additional support for AMD specific MCE features such as |
806 | the DRAM Error Threshold. | |
807 | ||
b2762686 AK |
808 | config X86_MCE_THRESHOLD |
809 | depends on X86_MCE_AMD || X86_MCE_INTEL | |
810 | bool | |
811 | default y | |
812 | ||
506f1d07 SR |
813 | config X86_MCE_NONFATAL |
814 | tristate "Check for non-fatal errors on AMD Athlon/Duron / Intel Pentium 4" | |
815 | depends on X86_32 && X86_MCE | |
8f9ca475 | 816 | ---help--- |
506f1d07 SR |
817 | Enabling this feature starts a timer that triggers every 5 seconds which |
818 | will look at the machine check registers to see if anything happened. | |
819 | Non-fatal problems automatically get corrected (but still logged). | |
820 | Disable this if you don't want to see these messages. | |
821 | Seeing the messages this option prints out may be indicative of dying | |
822 | or out-of-spec (ie, overclocked) hardware. | |
823 | This option only does something on certain CPUs. | |
824 | (AMD Athlon/Duron and Intel Pentium 4) | |
825 | ||
826 | config X86_MCE_P4THERMAL | |
827 | bool "check for P4 thermal throttling interrupt." | |
efefa6f6 | 828 | depends on X86_32 && X86_MCE && (X86_UP_APIC || SMP) |
8f9ca475 | 829 | ---help--- |
506f1d07 SR |
830 | Enabling this feature will cause a message to be printed when the P4 |
831 | enters thermal throttling. | |
832 | ||
833 | config VM86 | |
834 | bool "Enable VM86 support" if EMBEDDED | |
835 | default y | |
836 | depends on X86_32 | |
8f9ca475 IM |
837 | ---help--- |
838 | This option is required by programs like DOSEMU to run 16-bit legacy | |
506f1d07 | 839 | code on X86 processors. It also may be needed by software like |
8f9ca475 IM |
840 | XFree86 to initialize some video cards via BIOS. Disabling this |
841 | option saves about 6k. | |
506f1d07 SR |
842 | |
843 | config TOSHIBA | |
844 | tristate "Toshiba Laptop support" | |
845 | depends on X86_32 | |
846 | ---help--- | |
847 | This adds a driver to safely access the System Management Mode of | |
848 | the CPU on Toshiba portables with a genuine Toshiba BIOS. It does | |
849 | not work on models with a Phoenix BIOS. The System Management Mode | |
850 | is used to set the BIOS and power saving options on Toshiba portables. | |
851 | ||
852 | For information on utilities to make use of this driver see the | |
853 | Toshiba Linux utilities web site at: | |
854 | <http://www.buzzard.org.uk/toshiba/>. | |
855 | ||
856 | Say Y if you intend to run this kernel on a Toshiba portable. | |
857 | Say N otherwise. | |
858 | ||
859 | config I8K | |
860 | tristate "Dell laptop support" | |
506f1d07 SR |
861 | ---help--- |
862 | This adds a driver to safely access the System Management Mode | |
863 | of the CPU on the Dell Inspiron 8000. The System Management Mode | |
864 | is used to read cpu temperature and cooling fan status and to | |
865 | control the fans on the I8K portables. | |
866 | ||
867 | This driver has been tested only on the Inspiron 8000 but it may | |
868 | also work with other Dell laptops. You can force loading on other | |
869 | models by passing the parameter `force=1' to the module. Use at | |
870 | your own risk. | |
871 | ||
872 | For information on utilities to make use of this driver see the | |
873 | I8K Linux utilities web site at: | |
874 | <http://people.debian.org/~dz/i8k/> | |
875 | ||
876 | Say Y if you intend to run this kernel on a Dell Inspiron 8000. | |
877 | Say N otherwise. | |
878 | ||
879 | config X86_REBOOTFIXUPS | |
9ba16087 JB |
880 | bool "Enable X86 board specific fixups for reboot" |
881 | depends on X86_32 | |
506f1d07 SR |
882 | ---help--- |
883 | This enables chipset and/or board specific fixups to be done | |
884 | in order to get reboot to work correctly. This is only needed on | |
885 | some combinations of hardware and BIOS. The symptom, for which | |
886 | this config is intended, is when reboot ends with a stalled/hung | |
887 | system. | |
888 | ||
889 | Currently, the only fixup is for the Geode machines using | |
5e3a77e9 | 890 | CS5530A and CS5536 chipsets and the RDC R-321x SoC. |
506f1d07 SR |
891 | |
892 | Say Y if you want to enable the fixup. Currently, it's safe to | |
893 | enable this option even if you don't need it. | |
894 | Say N otherwise. | |
895 | ||
896 | config MICROCODE | |
8d86f390 | 897 | tristate "/dev/cpu/microcode - microcode support" |
506f1d07 SR |
898 | select FW_LOADER |
899 | ---help--- | |
900 | If you say Y here, you will be able to update the microcode on | |
80cc9f10 PO |
901 | certain Intel and AMD processors. The Intel support is for the |
902 | IA32 family, e.g. Pentium Pro, Pentium II, Pentium III, | |
903 | Pentium 4, Xeon etc. The AMD support is for family 0x10 and | |
904 | 0x11 processors, e.g. Opteron, Phenom and Turion 64 Ultra. | |
905 | You will obviously need the actual microcode binary data itself | |
906 | which is not shipped with the Linux kernel. | |
506f1d07 | 907 | |
8d86f390 PO |
908 | This option selects the general module only, you need to select |
909 | at least one vendor specific module as well. | |
506f1d07 SR |
910 | |
911 | To compile this driver as a module, choose M here: the | |
912 | module will be called microcode. | |
913 | ||
8d86f390 | 914 | config MICROCODE_INTEL |
8f9ca475 IM |
915 | bool "Intel microcode patch loading support" |
916 | depends on MICROCODE | |
917 | default MICROCODE | |
918 | select FW_LOADER | |
919 | ---help--- | |
920 | This options enables microcode patch loading support for Intel | |
921 | processors. | |
922 | ||
923 | For latest news and information on obtaining all the required | |
924 | Intel ingredients for this driver, check: | |
925 | <http://www.urbanmyth.org/microcode/>. | |
8d86f390 | 926 | |
80cc9f10 | 927 | config MICROCODE_AMD |
8f9ca475 IM |
928 | bool "AMD microcode patch loading support" |
929 | depends on MICROCODE | |
930 | select FW_LOADER | |
931 | ---help--- | |
932 | If you select this option, microcode patch loading support for AMD | |
933 | processors will be enabled. | |
80cc9f10 | 934 | |
8f9ca475 | 935 | config MICROCODE_OLD_INTERFACE |
3c2362e6 | 936 | def_bool y |
506f1d07 | 937 | depends on MICROCODE |
506f1d07 SR |
938 | |
939 | config X86_MSR | |
940 | tristate "/dev/cpu/*/msr - Model-specific register support" | |
8f9ca475 | 941 | ---help--- |
506f1d07 SR |
942 | This device gives privileged processes access to the x86 |
943 | Model-Specific Registers (MSRs). It is a character device with | |
944 | major 202 and minors 0 to 31 for /dev/cpu/0/msr to /dev/cpu/31/msr. | |
945 | MSR accesses are directed to a specific CPU on multi-processor | |
946 | systems. | |
947 | ||
948 | config X86_CPUID | |
949 | tristate "/dev/cpu/*/cpuid - CPU information support" | |
8f9ca475 | 950 | ---help--- |
506f1d07 SR |
951 | This device gives processes access to the x86 CPUID instruction to |
952 | be executed on a specific processor. It is a character device | |
953 | with major 203 and minors 0 to 31 for /dev/cpu/0/cpuid to | |
954 | /dev/cpu/31/cpuid. | |
955 | ||
9b779edf JSR |
956 | config X86_CPU_DEBUG |
957 | tristate "/sys/kernel/debug/x86/cpu/* - CPU Debug support" | |
958 | ---help--- | |
959 | If you select this option, this will provide various x86 CPUs | |
960 | information through debugfs. | |
961 | ||
506f1d07 SR |
962 | choice |
963 | prompt "High Memory Support" | |
964 | default HIGHMEM4G if !X86_NUMAQ | |
965 | default HIGHMEM64G if X86_NUMAQ | |
966 | depends on X86_32 | |
967 | ||
968 | config NOHIGHMEM | |
969 | bool "off" | |
970 | depends on !X86_NUMAQ | |
971 | ---help--- | |
972 | Linux can use up to 64 Gigabytes of physical memory on x86 systems. | |
973 | However, the address space of 32-bit x86 processors is only 4 | |
974 | Gigabytes large. That means that, if you have a large amount of | |
975 | physical memory, not all of it can be "permanently mapped" by the | |
976 | kernel. The physical memory that's not permanently mapped is called | |
977 | "high memory". | |
978 | ||
979 | If you are compiling a kernel which will never run on a machine with | |
980 | more than 1 Gigabyte total physical RAM, answer "off" here (default | |
981 | choice and suitable for most users). This will result in a "3GB/1GB" | |
982 | split: 3GB are mapped so that each process sees a 3GB virtual memory | |
983 | space and the remaining part of the 4GB virtual memory space is used | |
984 | by the kernel to permanently map as much physical memory as | |
985 | possible. | |
986 | ||
987 | If the machine has between 1 and 4 Gigabytes physical RAM, then | |
988 | answer "4GB" here. | |
989 | ||
990 | If more than 4 Gigabytes is used then answer "64GB" here. This | |
991 | selection turns Intel PAE (Physical Address Extension) mode on. | |
992 | PAE implements 3-level paging on IA32 processors. PAE is fully | |
993 | supported by Linux, PAE mode is implemented on all recent Intel | |
994 | processors (Pentium Pro and better). NOTE: If you say "64GB" here, | |
995 | then the kernel will not boot on CPUs that don't support PAE! | |
996 | ||
997 | The actual amount of total physical memory will either be | |
998 | auto detected or can be forced by using a kernel command line option | |
999 | such as "mem=256M". (Try "man bootparam" or see the documentation of | |
1000 | your boot loader (lilo or loadlin) about how to pass options to the | |
1001 | kernel at boot time.) | |
1002 | ||
1003 | If unsure, say "off". | |
1004 | ||
1005 | config HIGHMEM4G | |
1006 | bool "4GB" | |
1007 | depends on !X86_NUMAQ | |
8f9ca475 | 1008 | ---help--- |
506f1d07 SR |
1009 | Select this if you have a 32-bit processor and between 1 and 4 |
1010 | gigabytes of physical RAM. | |
1011 | ||
1012 | config HIGHMEM64G | |
1013 | bool "64GB" | |
1014 | depends on !M386 && !M486 | |
1015 | select X86_PAE | |
8f9ca475 | 1016 | ---help--- |
506f1d07 SR |
1017 | Select this if you have a 32-bit processor and more than 4 |
1018 | gigabytes of physical RAM. | |
1019 | ||
1020 | endchoice | |
1021 | ||
1022 | choice | |
1023 | depends on EXPERIMENTAL | |
1024 | prompt "Memory split" if EMBEDDED | |
1025 | default VMSPLIT_3G | |
1026 | depends on X86_32 | |
8f9ca475 | 1027 | ---help--- |
506f1d07 SR |
1028 | Select the desired split between kernel and user memory. |
1029 | ||
1030 | If the address range available to the kernel is less than the | |
1031 | physical memory installed, the remaining memory will be available | |
1032 | as "high memory". Accessing high memory is a little more costly | |
1033 | than low memory, as it needs to be mapped into the kernel first. | |
1034 | Note that increasing the kernel address space limits the range | |
1035 | available to user programs, making the address space there | |
1036 | tighter. Selecting anything other than the default 3G/1G split | |
1037 | will also likely make your kernel incompatible with binary-only | |
1038 | kernel modules. | |
1039 | ||
1040 | If you are not absolutely sure what you are doing, leave this | |
1041 | option alone! | |
1042 | ||
1043 | config VMSPLIT_3G | |
1044 | bool "3G/1G user/kernel split" | |
1045 | config VMSPLIT_3G_OPT | |
1046 | depends on !X86_PAE | |
1047 | bool "3G/1G user/kernel split (for full 1G low memory)" | |
1048 | config VMSPLIT_2G | |
1049 | bool "2G/2G user/kernel split" | |
1050 | config VMSPLIT_2G_OPT | |
1051 | depends on !X86_PAE | |
1052 | bool "2G/2G user/kernel split (for full 2G low memory)" | |
1053 | config VMSPLIT_1G | |
1054 | bool "1G/3G user/kernel split" | |
1055 | endchoice | |
1056 | ||
1057 | config PAGE_OFFSET | |
1058 | hex | |
1059 | default 0xB0000000 if VMSPLIT_3G_OPT | |
1060 | default 0x80000000 if VMSPLIT_2G | |
1061 | default 0x78000000 if VMSPLIT_2G_OPT | |
1062 | default 0x40000000 if VMSPLIT_1G | |
1063 | default 0xC0000000 | |
1064 | depends on X86_32 | |
1065 | ||
1066 | config HIGHMEM | |
3c2362e6 | 1067 | def_bool y |
506f1d07 | 1068 | depends on X86_32 && (HIGHMEM64G || HIGHMEM4G) |
506f1d07 SR |
1069 | |
1070 | config X86_PAE | |
9ba16087 | 1071 | bool "PAE (Physical Address Extension) Support" |
506f1d07 | 1072 | depends on X86_32 && !HIGHMEM4G |
8f9ca475 | 1073 | ---help--- |
506f1d07 SR |
1074 | PAE is required for NX support, and furthermore enables |
1075 | larger swapspace support for non-overcommit purposes. It | |
1076 | has the cost of more pagetable lookup overhead, and also | |
1077 | consumes more pagetable space per process. | |
1078 | ||
600715dc | 1079 | config ARCH_PHYS_ADDR_T_64BIT |
8f9ca475 | 1080 | def_bool X86_64 || X86_PAE |
600715dc | 1081 | |
9e899816 NP |
1082 | config DIRECT_GBPAGES |
1083 | bool "Enable 1GB pages for kernel pagetables" if EMBEDDED | |
1084 | default y | |
1085 | depends on X86_64 | |
8f9ca475 | 1086 | ---help--- |
9e899816 NP |
1087 | Allow the kernel linear mapping to use 1GB pages on CPUs that |
1088 | support it. This can improve the kernel's performance a tiny bit by | |
1089 | reducing TLB pressure. If in doubt, say "Y". | |
1090 | ||
506f1d07 SR |
1091 | # Common NUMA Features |
1092 | config NUMA | |
fd51b2d7 | 1093 | bool "Numa Memory Allocation and Scheduler Support" |
506f1d07 | 1094 | depends on SMP |
604d2055 | 1095 | depends on X86_64 || (X86_32 && HIGHMEM64G && (X86_NUMAQ || X86_BIGSMP || X86_SUMMIT && ACPI) && EXPERIMENTAL) |
0699eae1 | 1096 | default y if (X86_NUMAQ || X86_SUMMIT || X86_BIGSMP) |
8f9ca475 | 1097 | ---help--- |
506f1d07 | 1098 | Enable NUMA (Non Uniform Memory Access) support. |
fd51b2d7 | 1099 | |
506f1d07 SR |
1100 | The kernel will try to allocate memory used by a CPU on the |
1101 | local memory controller of the CPU and add some more | |
1102 | NUMA awareness to the kernel. | |
1103 | ||
c280ea5e | 1104 | For 64-bit this is recommended if the system is Intel Core i7 |
fd51b2d7 KM |
1105 | (or later), AMD Opteron, or EM64T NUMA. |
1106 | ||
1107 | For 32-bit this is only needed on (rare) 32-bit-only platforms | |
1108 | that support NUMA topologies, such as NUMAQ / Summit, or if you | |
1109 | boot a 32-bit kernel on a 64-bit NUMA platform. | |
1110 | ||
1111 | Otherwise, you should say N. | |
506f1d07 SR |
1112 | |
1113 | comment "NUMA (Summit) requires SMP, 64GB highmem support, ACPI" | |
1114 | depends on X86_32 && X86_SUMMIT && (!HIGHMEM64G || !ACPI) | |
1115 | ||
1116 | config K8_NUMA | |
3c2362e6 HH |
1117 | def_bool y |
1118 | prompt "Old style AMD Opteron NUMA detection" | |
1119 | depends on X86_64 && NUMA && PCI | |
8f9ca475 IM |
1120 | ---help--- |
1121 | Enable K8 NUMA node topology detection. You should say Y here if | |
1122 | you have a multi processor AMD K8 system. This uses an old | |
1123 | method to read the NUMA configuration directly from the builtin | |
1124 | Northbridge of Opteron. It is recommended to use X86_64_ACPI_NUMA | |
1125 | instead, which also takes priority if both are compiled in. | |
506f1d07 SR |
1126 | |
1127 | config X86_64_ACPI_NUMA | |
3c2362e6 HH |
1128 | def_bool y |
1129 | prompt "ACPI NUMA detection" | |
506f1d07 SR |
1130 | depends on X86_64 && NUMA && ACPI && PCI |
1131 | select ACPI_NUMA | |
8f9ca475 | 1132 | ---help--- |
506f1d07 SR |
1133 | Enable ACPI SRAT based node topology detection. |
1134 | ||
6ec6e0d9 SS |
1135 | # Some NUMA nodes have memory ranges that span |
1136 | # other nodes. Even though a pfn is valid and | |
1137 | # between a node's start and end pfns, it may not | |
1138 | # reside on that node. See memmap_init_zone() | |
1139 | # for details. | |
1140 | config NODES_SPAN_OTHER_NODES | |
1141 | def_bool y | |
1142 | depends on X86_64_ACPI_NUMA | |
1143 | ||
506f1d07 SR |
1144 | config NUMA_EMU |
1145 | bool "NUMA emulation" | |
1146 | depends on X86_64 && NUMA | |
8f9ca475 | 1147 | ---help--- |
506f1d07 SR |
1148 | Enable NUMA emulation. A flat machine will be split |
1149 | into virtual nodes when booted with "numa=fake=N", where N is the | |
1150 | number of nodes. This is only useful for debugging. | |
1151 | ||
1152 | config NODES_SHIFT | |
d25e26b6 | 1153 | int "Maximum NUMA Nodes (as a power of 2)" if !MAXSMP |
46d50c98 | 1154 | range 1 9 |
d25e26b6 | 1155 | default "9" if MAXSMP |
506f1d07 SR |
1156 | default "6" if X86_64 |
1157 | default "4" if X86_NUMAQ | |
1158 | default "3" | |
1159 | depends on NEED_MULTIPLE_NODES | |
8f9ca475 | 1160 | ---help--- |
1184dc2f | 1161 | Specify the maximum number of NUMA Nodes available on the target |
692105b8 | 1162 | system. Increases memory reserved to accommodate various tables. |
506f1d07 | 1163 | |
c1329375 | 1164 | config HAVE_ARCH_BOOTMEM |
3c2362e6 | 1165 | def_bool y |
506f1d07 | 1166 | depends on X86_32 && NUMA |
506f1d07 SR |
1167 | |
1168 | config ARCH_HAVE_MEMORY_PRESENT | |
3c2362e6 | 1169 | def_bool y |
506f1d07 | 1170 | depends on X86_32 && DISCONTIGMEM |
506f1d07 SR |
1171 | |
1172 | config NEED_NODE_MEMMAP_SIZE | |
3c2362e6 | 1173 | def_bool y |
506f1d07 | 1174 | depends on X86_32 && (DISCONTIGMEM || SPARSEMEM) |
506f1d07 SR |
1175 | |
1176 | config HAVE_ARCH_ALLOC_REMAP | |
3c2362e6 | 1177 | def_bool y |
506f1d07 | 1178 | depends on X86_32 && NUMA |
506f1d07 SR |
1179 | |
1180 | config ARCH_FLATMEM_ENABLE | |
1181 | def_bool y | |
99809963 | 1182 | depends on X86_32 && ARCH_SELECT_MEMORY_MODEL && !NUMA |
506f1d07 SR |
1183 | |
1184 | config ARCH_DISCONTIGMEM_ENABLE | |
1185 | def_bool y | |
b263295d | 1186 | depends on NUMA && X86_32 |
506f1d07 SR |
1187 | |
1188 | config ARCH_DISCONTIGMEM_DEFAULT | |
1189 | def_bool y | |
b263295d CL |
1190 | depends on NUMA && X86_32 |
1191 | ||
1192 | config ARCH_SPARSEMEM_DEFAULT | |
1193 | def_bool y | |
1194 | depends on X86_64 | |
506f1d07 SR |
1195 | |
1196 | config ARCH_SPARSEMEM_ENABLE | |
1197 | def_bool y | |
4272ebfb | 1198 | depends on X86_64 || NUMA || (EXPERIMENTAL && X86_32) || X86_32_NON_STANDARD |
506f1d07 SR |
1199 | select SPARSEMEM_STATIC if X86_32 |
1200 | select SPARSEMEM_VMEMMAP_ENABLE if X86_64 | |
1201 | ||
1202 | config ARCH_SELECT_MEMORY_MODEL | |
1203 | def_bool y | |
b263295d | 1204 | depends on ARCH_SPARSEMEM_ENABLE |
506f1d07 SR |
1205 | |
1206 | config ARCH_MEMORY_PROBE | |
1207 | def_bool X86_64 | |
1208 | depends on MEMORY_HOTPLUG | |
1209 | ||
1210 | source "mm/Kconfig" | |
1211 | ||
1212 | config HIGHPTE | |
1213 | bool "Allocate 3rd-level pagetables from highmem" | |
1214 | depends on X86_32 && (HIGHMEM4G || HIGHMEM64G) | |
8f9ca475 | 1215 | ---help--- |
506f1d07 SR |
1216 | The VM uses one page table entry for each page of physical memory. |
1217 | For systems with a lot of RAM, this can be wasteful of precious | |
1218 | low memory. Setting this option will put user-space page table | |
1219 | entries in high memory. | |
1220 | ||
9f077871 | 1221 | config X86_CHECK_BIOS_CORRUPTION |
8f9ca475 IM |
1222 | bool "Check for low memory corruption" |
1223 | ---help--- | |
1224 | Periodically check for memory corruption in low memory, which | |
1225 | is suspected to be caused by BIOS. Even when enabled in the | |
1226 | configuration, it is disabled at runtime. Enable it by | |
1227 | setting "memory_corruption_check=1" on the kernel command | |
1228 | line. By default it scans the low 64k of memory every 60 | |
1229 | seconds; see the memory_corruption_check_size and | |
1230 | memory_corruption_check_period parameters in | |
1231 | Documentation/kernel-parameters.txt to adjust this. | |
1232 | ||
1233 | When enabled with the default parameters, this option has | |
1234 | almost no overhead, as it reserves a relatively small amount | |
1235 | of memory and scans it infrequently. It both detects corruption | |
1236 | and prevents it from affecting the running system. | |
1237 | ||
1238 | It is, however, intended as a diagnostic tool; if repeatable | |
1239 | BIOS-originated corruption always affects the same memory, | |
1240 | you can use memmap= to prevent the kernel from using that | |
1241 | memory. | |
9f077871 | 1242 | |
c885df50 | 1243 | config X86_BOOTPARAM_MEMORY_CORRUPTION_CHECK |
8f9ca475 | 1244 | bool "Set the default setting of memory_corruption_check" |
c885df50 JF |
1245 | depends on X86_CHECK_BIOS_CORRUPTION |
1246 | default y | |
8f9ca475 IM |
1247 | ---help--- |
1248 | Set whether the default state of memory_corruption_check is | |
1249 | on or off. | |
c885df50 | 1250 | |
fc381519 | 1251 | config X86_RESERVE_LOW_64K |
8f9ca475 | 1252 | bool "Reserve low 64K of RAM on AMI/Phoenix BIOSen" |
fc381519 | 1253 | default y |
8f9ca475 IM |
1254 | ---help--- |
1255 | Reserve the first 64K of physical RAM on BIOSes that are known | |
1256 | to potentially corrupt that memory range. A numbers of BIOSes are | |
1257 | known to utilize this area during suspend/resume, so it must not | |
1258 | be used by the kernel. | |
fc381519 | 1259 | |
8f9ca475 IM |
1260 | Set this to N if you are absolutely sure that you trust the BIOS |
1261 | to get all its memory reservations and usages right. | |
fc381519 | 1262 | |
8f9ca475 IM |
1263 | If you have doubts about the BIOS (e.g. suspend/resume does not |
1264 | work or there's kernel crashes after certain hardware hotplug | |
1265 | events) and it's not AMI or Phoenix, then you might want to enable | |
1266 | X86_CHECK_BIOS_CORRUPTION=y to allow the kernel to check typical | |
1267 | corruption patterns. | |
fc381519 | 1268 | |
8f9ca475 | 1269 | Say Y if unsure. |
fc381519 | 1270 | |
506f1d07 SR |
1271 | config MATH_EMULATION |
1272 | bool | |
1273 | prompt "Math emulation" if X86_32 | |
1274 | ---help--- | |
1275 | Linux can emulate a math coprocessor (used for floating point | |
1276 | operations) if you don't have one. 486DX and Pentium processors have | |
1277 | a math coprocessor built in, 486SX and 386 do not, unless you added | |
1278 | a 487DX or 387, respectively. (The messages during boot time can | |
1279 | give you some hints here ["man dmesg"].) Everyone needs either a | |
1280 | coprocessor or this emulation. | |
1281 | ||
1282 | If you don't have a math coprocessor, you need to say Y here; if you | |
1283 | say Y here even though you have a coprocessor, the coprocessor will | |
1284 | be used nevertheless. (This behavior can be changed with the kernel | |
1285 | command line option "no387", which comes handy if your coprocessor | |
1286 | is broken. Try "man bootparam" or see the documentation of your boot | |
1287 | loader (lilo or loadlin) about how to pass options to the kernel at | |
1288 | boot time.) This means that it is a good idea to say Y here if you | |
1289 | intend to use this kernel on different machines. | |
1290 | ||
1291 | More information about the internals of the Linux math coprocessor | |
1292 | emulation can be found in <file:arch/x86/math-emu/README>. | |
1293 | ||
1294 | If you are not sure, say Y; apart from resulting in a 66 KB bigger | |
1295 | kernel, it won't hurt. | |
1296 | ||
1297 | config MTRR | |
1298 | bool "MTRR (Memory Type Range Register) support" | |
1299 | ---help--- | |
1300 | On Intel P6 family processors (Pentium Pro, Pentium II and later) | |
1301 | the Memory Type Range Registers (MTRRs) may be used to control | |
1302 | processor access to memory ranges. This is most useful if you have | |
1303 | a video (VGA) card on a PCI or AGP bus. Enabling write-combining | |
1304 | allows bus write transfers to be combined into a larger transfer | |
1305 | before bursting over the PCI/AGP bus. This can increase performance | |
1306 | of image write operations 2.5 times or more. Saying Y here creates a | |
1307 | /proc/mtrr file which may be used to manipulate your processor's | |
1308 | MTRRs. Typically the X server should use this. | |
1309 | ||
1310 | This code has a reasonably generic interface so that similar | |
1311 | control registers on other processors can be easily supported | |
1312 | as well: | |
1313 | ||
1314 | The Cyrix 6x86, 6x86MX and M II processors have Address Range | |
1315 | Registers (ARRs) which provide a similar functionality to MTRRs. For | |
1316 | these, the ARRs are used to emulate the MTRRs. | |
1317 | The AMD K6-2 (stepping 8 and above) and K6-3 processors have two | |
1318 | MTRRs. The Centaur C6 (WinChip) has 8 MCRs, allowing | |
1319 | write-combining. All of these processors are supported by this code | |
1320 | and it makes sense to say Y here if you have one of them. | |
1321 | ||
1322 | Saying Y here also fixes a problem with buggy SMP BIOSes which only | |
1323 | set the MTRRs for the boot CPU and not for the secondary CPUs. This | |
1324 | can lead to all sorts of problems, so it's good to say Y here. | |
1325 | ||
1326 | You can safely say Y even if your machine doesn't have MTRRs, you'll | |
1327 | just add about 9 KB to your kernel. | |
1328 | ||
7225e751 | 1329 | See <file:Documentation/x86/mtrr.txt> for more information. |
506f1d07 | 1330 | |
95ffa243 | 1331 | config MTRR_SANITIZER |
2ffb3501 | 1332 | def_bool y |
95ffa243 YL |
1333 | prompt "MTRR cleanup support" |
1334 | depends on MTRR | |
8f9ca475 | 1335 | ---help--- |
aba3728c TG |
1336 | Convert MTRR layout from continuous to discrete, so X drivers can |
1337 | add writeback entries. | |
95ffa243 | 1338 | |
aba3728c | 1339 | Can be disabled with disable_mtrr_cleanup on the kernel command line. |
692105b8 | 1340 | The largest mtrr entry size for a continuous block can be set with |
aba3728c | 1341 | mtrr_chunk_size. |
95ffa243 | 1342 | |
2ffb3501 | 1343 | If unsure, say Y. |
95ffa243 YL |
1344 | |
1345 | config MTRR_SANITIZER_ENABLE_DEFAULT | |
f5098d62 YL |
1346 | int "MTRR cleanup enable value (0-1)" |
1347 | range 0 1 | |
1348 | default "0" | |
95ffa243 | 1349 | depends on MTRR_SANITIZER |
8f9ca475 | 1350 | ---help--- |
f5098d62 | 1351 | Enable mtrr cleanup default value |
95ffa243 | 1352 | |
12031a62 YL |
1353 | config MTRR_SANITIZER_SPARE_REG_NR_DEFAULT |
1354 | int "MTRR cleanup spare reg num (0-7)" | |
1355 | range 0 7 | |
1356 | default "1" | |
1357 | depends on MTRR_SANITIZER | |
8f9ca475 | 1358 | ---help--- |
12031a62 | 1359 | mtrr cleanup spare entries default, it can be changed via |
aba3728c | 1360 | mtrr_spare_reg_nr=N on the kernel command line. |
12031a62 | 1361 | |
2e5d9c85 | 1362 | config X86_PAT |
2a8a2719 | 1363 | bool |
2e5d9c85 | 1364 | prompt "x86 PAT support" |
2a8a2719 | 1365 | depends on MTRR |
8f9ca475 | 1366 | ---help--- |
2e5d9c85 | 1367 | Use PAT attributes to setup page level cache control. |
042b78e4 | 1368 | |
2e5d9c85 | 1369 | PATs are the modern equivalents of MTRRs and are much more |
1370 | flexible than MTRRs. | |
1371 | ||
1372 | Say N here if you see bootup problems (boot crash, boot hang, | |
042b78e4 | 1373 | spontaneous reboots) or a non-working video driver. |
2e5d9c85 | 1374 | |
1375 | If unsure, say Y. | |
1376 | ||
506f1d07 | 1377 | config EFI |
9ba16087 | 1378 | bool "EFI runtime service support" |
5b83683f | 1379 | depends on ACPI |
506f1d07 | 1380 | ---help--- |
8f9ca475 IM |
1381 | This enables the kernel to use EFI runtime services that are |
1382 | available (such as the EFI variable services). | |
506f1d07 | 1383 | |
8f9ca475 IM |
1384 | This option is only useful on systems that have EFI firmware. |
1385 | In addition, you should use the latest ELILO loader available | |
1386 | at <http://elilo.sourceforge.net> in order to take advantage | |
1387 | of EFI runtime services. However, even with this option, the | |
1388 | resultant kernel should continue to boot on existing non-EFI | |
1389 | platforms. | |
506f1d07 | 1390 | |
506f1d07 | 1391 | config SECCOMP |
3c2362e6 HH |
1392 | def_bool y |
1393 | prompt "Enable seccomp to safely compute untrusted bytecode" | |
8f9ca475 | 1394 | ---help--- |
506f1d07 SR |
1395 | This kernel feature is useful for number crunching applications |
1396 | that may need to compute untrusted bytecode during their | |
1397 | execution. By using pipes or other transports made available to | |
1398 | the process as file descriptors supporting the read/write | |
1399 | syscalls, it's possible to isolate those applications in | |
1400 | their own address space using seccomp. Once seccomp is | |
9c0bbee8 | 1401 | enabled via prctl(PR_SET_SECCOMP), it cannot be disabled |
506f1d07 SR |
1402 | and the task is only allowed to execute a few safe syscalls |
1403 | defined by each seccomp mode. | |
1404 | ||
1405 | If unsure, say Y. Only embedded should say N here. | |
1406 | ||
113c5413 IM |
1407 | config CC_STACKPROTECTOR_ALL |
1408 | bool | |
1409 | ||
506f1d07 SR |
1410 | config CC_STACKPROTECTOR |
1411 | bool "Enable -fstack-protector buffer overflow detection (EXPERIMENTAL)" | |
113c5413 | 1412 | select CC_STACKPROTECTOR_ALL |
8f9ca475 IM |
1413 | ---help--- |
1414 | This option turns on the -fstack-protector GCC feature. This | |
113c5413 IM |
1415 | feature puts, at the beginning of functions, a canary value on |
1416 | the stack just before the return address, and validates | |
506f1d07 SR |
1417 | the value just before actually returning. Stack based buffer |
1418 | overflows (that need to overwrite this return address) now also | |
1419 | overwrite the canary, which gets detected and the attack is then | |
1420 | neutralized via a kernel panic. | |
1421 | ||
1422 | This feature requires gcc version 4.2 or above, or a distribution | |
1423 | gcc with the feature backported. Older versions are automatically | |
113c5413 IM |
1424 | detected and for those versions, this configuration option is |
1425 | ignored. (and a warning is printed during bootup) | |
506f1d07 SR |
1426 | |
1427 | source kernel/Kconfig.hz | |
1428 | ||
1429 | config KEXEC | |
1430 | bool "kexec system call" | |
8f9ca475 | 1431 | ---help--- |
506f1d07 SR |
1432 | kexec is a system call that implements the ability to shutdown your |
1433 | current kernel, and to start another kernel. It is like a reboot | |
1434 | but it is independent of the system firmware. And like a reboot | |
1435 | you can start any kernel with it, not just Linux. | |
1436 | ||
1437 | The name comes from the similarity to the exec system call. | |
1438 | ||
1439 | It is an ongoing process to be certain the hardware in a machine | |
1440 | is properly shutdown, so do not be surprised if this code does not | |
1441 | initially work for you. It may help to enable device hotplugging | |
1442 | support. As of this writing the exact hardware interface is | |
1443 | strongly in flux, so no good recommendation can be made. | |
1444 | ||
1445 | config CRASH_DUMP | |
04b69447 | 1446 | bool "kernel crash dumps" |
506f1d07 | 1447 | depends on X86_64 || (X86_32 && HIGHMEM) |
8f9ca475 | 1448 | ---help--- |
506f1d07 SR |
1449 | Generate crash dump after being started by kexec. |
1450 | This should be normally only set in special crash dump kernels | |
1451 | which are loaded in the main kernel with kexec-tools into | |
1452 | a specially reserved region and then later executed after | |
1453 | a crash by kdump/kexec. The crash dump kernel must be compiled | |
1454 | to a memory address not used by the main kernel or BIOS using | |
1455 | PHYSICAL_START, or it must be built as a relocatable image | |
1456 | (CONFIG_RELOCATABLE=y). | |
1457 | For more details see Documentation/kdump/kdump.txt | |
1458 | ||
3ab83521 HY |
1459 | config KEXEC_JUMP |
1460 | bool "kexec jump (EXPERIMENTAL)" | |
1461 | depends on EXPERIMENTAL | |
fee7b0d8 | 1462 | depends on KEXEC && HIBERNATION |
8f9ca475 | 1463 | ---help--- |
89081d17 HY |
1464 | Jump between original kernel and kexeced kernel and invoke |
1465 | code in physical address mode via KEXEC | |
3ab83521 | 1466 | |
506f1d07 SR |
1467 | config PHYSICAL_START |
1468 | hex "Physical address where the kernel is loaded" if (EMBEDDED || CRASH_DUMP) | |
ceefccc9 | 1469 | default "0x1000000" |
8f9ca475 | 1470 | ---help--- |
506f1d07 SR |
1471 | This gives the physical address where the kernel is loaded. |
1472 | ||
1473 | If kernel is a not relocatable (CONFIG_RELOCATABLE=n) then | |
1474 | bzImage will decompress itself to above physical address and | |
1475 | run from there. Otherwise, bzImage will run from the address where | |
1476 | it has been loaded by the boot loader and will ignore above physical | |
1477 | address. | |
1478 | ||
1479 | In normal kdump cases one does not have to set/change this option | |
1480 | as now bzImage can be compiled as a completely relocatable image | |
1481 | (CONFIG_RELOCATABLE=y) and be used to load and run from a different | |
1482 | address. This option is mainly useful for the folks who don't want | |
1483 | to use a bzImage for capturing the crash dump and want to use a | |
1484 | vmlinux instead. vmlinux is not relocatable hence a kernel needs | |
1485 | to be specifically compiled to run from a specific memory area | |
1486 | (normally a reserved region) and this option comes handy. | |
1487 | ||
ceefccc9 PA |
1488 | So if you are using bzImage for capturing the crash dump, |
1489 | leave the value here unchanged to 0x1000000 and set | |
1490 | CONFIG_RELOCATABLE=y. Otherwise if you plan to use vmlinux | |
1491 | for capturing the crash dump change this value to start of | |
1492 | the reserved region. In other words, it can be set based on | |
1493 | the "X" value as specified in the "crashkernel=YM@XM" | |
1494 | command line boot parameter passed to the panic-ed | |
1495 | kernel. Please take a look at Documentation/kdump/kdump.txt | |
1496 | for more details about crash dumps. | |
506f1d07 SR |
1497 | |
1498 | Usage of bzImage for capturing the crash dump is recommended as | |
1499 | one does not have to build two kernels. Same kernel can be used | |
1500 | as production kernel and capture kernel. Above option should have | |
1501 | gone away after relocatable bzImage support is introduced. But it | |
1502 | is present because there are users out there who continue to use | |
1503 | vmlinux for dump capture. This option should go away down the | |
1504 | line. | |
1505 | ||
1506 | Don't change this unless you know what you are doing. | |
1507 | ||
1508 | config RELOCATABLE | |
26717808 PA |
1509 | bool "Build a relocatable kernel" |
1510 | default y | |
8f9ca475 | 1511 | ---help--- |
506f1d07 SR |
1512 | This builds a kernel image that retains relocation information |
1513 | so it can be loaded someplace besides the default 1MB. | |
1514 | The relocations tend to make the kernel binary about 10% larger, | |
1515 | but are discarded at runtime. | |
1516 | ||
1517 | One use is for the kexec on panic case where the recovery kernel | |
1518 | must live at a different physical address than the primary | |
1519 | kernel. | |
1520 | ||
1521 | Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address | |
1522 | it has been loaded at and the compile time physical address | |
1523 | (CONFIG_PHYSICAL_START) is ignored. | |
1524 | ||
845adf72 PA |
1525 | # Relocation on x86-32 needs some additional build support |
1526 | config X86_NEED_RELOCS | |
1527 | def_bool y | |
1528 | depends on X86_32 && RELOCATABLE | |
1529 | ||
506f1d07 SR |
1530 | config PHYSICAL_ALIGN |
1531 | hex | |
1532 | prompt "Alignment value to which kernel should be aligned" if X86_32 | |
ceefccc9 PA |
1533 | default "0x1000000" |
1534 | range 0x2000 0x1000000 | |
8f9ca475 | 1535 | ---help--- |
506f1d07 SR |
1536 | This value puts the alignment restrictions on physical address |
1537 | where kernel is loaded and run from. Kernel is compiled for an | |
1538 | address which meets above alignment restriction. | |
1539 | ||
1540 | If bootloader loads the kernel at a non-aligned address and | |
1541 | CONFIG_RELOCATABLE is set, kernel will move itself to nearest | |
1542 | address aligned to above value and run from there. | |
1543 | ||
1544 | If bootloader loads the kernel at a non-aligned address and | |
1545 | CONFIG_RELOCATABLE is not set, kernel will ignore the run time | |
1546 | load address and decompress itself to the address it has been | |
1547 | compiled for and run from there. The address for which kernel is | |
1548 | compiled already meets above alignment restrictions. Hence the | |
1549 | end result is that kernel runs from a physical address meeting | |
1550 | above alignment restrictions. | |
1551 | ||
1552 | Don't change this unless you know what you are doing. | |
1553 | ||
1554 | config HOTPLUG_CPU | |
7c13e6a3 | 1555 | bool "Support for hot-pluggable CPUs" |
4b19ed91 | 1556 | depends on SMP && HOTPLUG |
506f1d07 | 1557 | ---help--- |
7c13e6a3 DS |
1558 | Say Y here to allow turning CPUs off and on. CPUs can be |
1559 | controlled through /sys/devices/system/cpu. | |
1560 | ( Note: power management support will enable this option | |
1561 | automatically on SMP systems. ) | |
1562 | Say N if you want to disable CPU hotplug. | |
506f1d07 SR |
1563 | |
1564 | config COMPAT_VDSO | |
3c2362e6 HH |
1565 | def_bool y |
1566 | prompt "Compat VDSO support" | |
af65d648 | 1567 | depends on X86_32 || IA32_EMULATION |
8f9ca475 | 1568 | ---help--- |
af65d648 | 1569 | Map the 32-bit VDSO to the predictable old-style address too. |
506f1d07 SR |
1570 | ---help--- |
1571 | Say N here if you are running a sufficiently recent glibc | |
1572 | version (2.3.3 or later), to remove the high-mapped | |
1573 | VDSO mapping and to exclusively use the randomized VDSO. | |
1574 | ||
1575 | If unsure, say Y. | |
1576 | ||
516cbf37 TB |
1577 | config CMDLINE_BOOL |
1578 | bool "Built-in kernel command line" | |
1579 | default n | |
8f9ca475 | 1580 | ---help--- |
516cbf37 TB |
1581 | Allow for specifying boot arguments to the kernel at |
1582 | build time. On some systems (e.g. embedded ones), it is | |
1583 | necessary or convenient to provide some or all of the | |
1584 | kernel boot arguments with the kernel itself (that is, | |
1585 | to not rely on the boot loader to provide them.) | |
1586 | ||
1587 | To compile command line arguments into the kernel, | |
1588 | set this option to 'Y', then fill in the | |
1589 | the boot arguments in CONFIG_CMDLINE. | |
1590 | ||
1591 | Systems with fully functional boot loaders (i.e. non-embedded) | |
1592 | should leave this option set to 'N'. | |
1593 | ||
1594 | config CMDLINE | |
1595 | string "Built-in kernel command string" | |
1596 | depends on CMDLINE_BOOL | |
1597 | default "" | |
8f9ca475 | 1598 | ---help--- |
516cbf37 TB |
1599 | Enter arguments here that should be compiled into the kernel |
1600 | image and used at boot time. If the boot loader provides a | |
1601 | command line at boot time, it is appended to this string to | |
1602 | form the full kernel command line, when the system boots. | |
1603 | ||
1604 | However, you can use the CONFIG_CMDLINE_OVERRIDE option to | |
1605 | change this behavior. | |
1606 | ||
1607 | In most cases, the command line (whether built-in or provided | |
1608 | by the boot loader) should specify the device for the root | |
1609 | file system. | |
1610 | ||
1611 | config CMDLINE_OVERRIDE | |
1612 | bool "Built-in command line overrides boot loader arguments" | |
1613 | default n | |
1614 | depends on CMDLINE_BOOL | |
8f9ca475 | 1615 | ---help--- |
516cbf37 TB |
1616 | Set this option to 'Y' to have the kernel ignore the boot loader |
1617 | command line, and use ONLY the built-in command line. | |
1618 | ||
1619 | This is used to work around broken boot loaders. This should | |
1620 | be set to 'N' under normal conditions. | |
1621 | ||
506f1d07 SR |
1622 | endmenu |
1623 | ||
1624 | config ARCH_ENABLE_MEMORY_HOTPLUG | |
1625 | def_bool y | |
1626 | depends on X86_64 || (X86_32 && HIGHMEM) | |
1627 | ||
35551053 GH |
1628 | config ARCH_ENABLE_MEMORY_HOTREMOVE |
1629 | def_bool y | |
1630 | depends on MEMORY_HOTPLUG | |
1631 | ||
506f1d07 SR |
1632 | config HAVE_ARCH_EARLY_PFN_TO_NID |
1633 | def_bool X86_64 | |
1634 | depends on NUMA | |
1635 | ||
da85f865 | 1636 | menu "Power management and ACPI options" |
e279b6c1 SR |
1637 | |
1638 | config ARCH_HIBERNATION_HEADER | |
3c2362e6 | 1639 | def_bool y |
e279b6c1 | 1640 | depends on X86_64 && HIBERNATION |
e279b6c1 SR |
1641 | |
1642 | source "kernel/power/Kconfig" | |
1643 | ||
1644 | source "drivers/acpi/Kconfig" | |
1645 | ||
a6b68076 AK |
1646 | config X86_APM_BOOT |
1647 | bool | |
1648 | default y | |
1649 | depends on APM || APM_MODULE | |
1650 | ||
e279b6c1 SR |
1651 | menuconfig APM |
1652 | tristate "APM (Advanced Power Management) BIOS support" | |
efefa6f6 | 1653 | depends on X86_32 && PM_SLEEP |
e279b6c1 SR |
1654 | ---help--- |
1655 | APM is a BIOS specification for saving power using several different | |
1656 | techniques. This is mostly useful for battery powered laptops with | |
1657 | APM compliant BIOSes. If you say Y here, the system time will be | |
1658 | reset after a RESUME operation, the /proc/apm device will provide | |
1659 | battery status information, and user-space programs will receive | |
1660 | notification of APM "events" (e.g. battery status change). | |
1661 | ||
1662 | If you select "Y" here, you can disable actual use of the APM | |
1663 | BIOS by passing the "apm=off" option to the kernel at boot time. | |
1664 | ||
1665 | Note that the APM support is almost completely disabled for | |
1666 | machines with more than one CPU. | |
1667 | ||
1668 | In order to use APM, you will need supporting software. For location | |
53471121 | 1669 | and more information, read <file:Documentation/power/pm.txt> and the |
e279b6c1 SR |
1670 | Battery Powered Linux mini-HOWTO, available from |
1671 | <http://www.tldp.org/docs.html#howto>. | |
1672 | ||
1673 | This driver does not spin down disk drives (see the hdparm(8) | |
1674 | manpage ("man 8 hdparm") for that), and it doesn't turn off | |
1675 | VESA-compliant "green" monitors. | |
1676 | ||
1677 | This driver does not support the TI 4000M TravelMate and the ACER | |
1678 | 486/DX4/75 because they don't have compliant BIOSes. Many "green" | |
1679 | desktop machines also don't have compliant BIOSes, and this driver | |
1680 | may cause those machines to panic during the boot phase. | |
1681 | ||
1682 | Generally, if you don't have a battery in your machine, there isn't | |
1683 | much point in using this driver and you should say N. If you get | |
1684 | random kernel OOPSes or reboots that don't seem to be related to | |
1685 | anything, try disabling/enabling this option (or disabling/enabling | |
1686 | APM in your BIOS). | |
1687 | ||
1688 | Some other things you should try when experiencing seemingly random, | |
1689 | "weird" problems: | |
1690 | ||
1691 | 1) make sure that you have enough swap space and that it is | |
1692 | enabled. | |
1693 | 2) pass the "no-hlt" option to the kernel | |
1694 | 3) switch on floating point emulation in the kernel and pass | |
1695 | the "no387" option to the kernel | |
1696 | 4) pass the "floppy=nodma" option to the kernel | |
1697 | 5) pass the "mem=4M" option to the kernel (thereby disabling | |
1698 | all but the first 4 MB of RAM) | |
1699 | 6) make sure that the CPU is not over clocked. | |
1700 | 7) read the sig11 FAQ at <http://www.bitwizard.nl/sig11/> | |
1701 | 8) disable the cache from your BIOS settings | |
1702 | 9) install a fan for the video card or exchange video RAM | |
1703 | 10) install a better fan for the CPU | |
1704 | 11) exchange RAM chips | |
1705 | 12) exchange the motherboard. | |
1706 | ||
1707 | To compile this driver as a module, choose M here: the | |
1708 | module will be called apm. | |
1709 | ||
1710 | if APM | |
1711 | ||
1712 | config APM_IGNORE_USER_SUSPEND | |
1713 | bool "Ignore USER SUSPEND" | |
8f9ca475 | 1714 | ---help--- |
e279b6c1 SR |
1715 | This option will ignore USER SUSPEND requests. On machines with a |
1716 | compliant APM BIOS, you want to say N. However, on the NEC Versa M | |
1717 | series notebooks, it is necessary to say Y because of a BIOS bug. | |
1718 | ||
1719 | config APM_DO_ENABLE | |
1720 | bool "Enable PM at boot time" | |
1721 | ---help--- | |
1722 | Enable APM features at boot time. From page 36 of the APM BIOS | |
1723 | specification: "When disabled, the APM BIOS does not automatically | |
1724 | power manage devices, enter the Standby State, enter the Suspend | |
1725 | State, or take power saving steps in response to CPU Idle calls." | |
1726 | This driver will make CPU Idle calls when Linux is idle (unless this | |
1727 | feature is turned off -- see "Do CPU IDLE calls", below). This | |
1728 | should always save battery power, but more complicated APM features | |
1729 | will be dependent on your BIOS implementation. You may need to turn | |
1730 | this option off if your computer hangs at boot time when using APM | |
1731 | support, or if it beeps continuously instead of suspending. Turn | |
1732 | this off if you have a NEC UltraLite Versa 33/C or a Toshiba | |
1733 | T400CDT. This is off by default since most machines do fine without | |
1734 | this feature. | |
1735 | ||
1736 | config APM_CPU_IDLE | |
1737 | bool "Make CPU Idle calls when idle" | |
8f9ca475 | 1738 | ---help--- |
e279b6c1 SR |
1739 | Enable calls to APM CPU Idle/CPU Busy inside the kernel's idle loop. |
1740 | On some machines, this can activate improved power savings, such as | |
1741 | a slowed CPU clock rate, when the machine is idle. These idle calls | |
1742 | are made after the idle loop has run for some length of time (e.g., | |
1743 | 333 mS). On some machines, this will cause a hang at boot time or | |
1744 | whenever the CPU becomes idle. (On machines with more than one CPU, | |
1745 | this option does nothing.) | |
1746 | ||
1747 | config APM_DISPLAY_BLANK | |
1748 | bool "Enable console blanking using APM" | |
8f9ca475 | 1749 | ---help--- |
e279b6c1 SR |
1750 | Enable console blanking using the APM. Some laptops can use this to |
1751 | turn off the LCD backlight when the screen blanker of the Linux | |
1752 | virtual console blanks the screen. Note that this is only used by | |
1753 | the virtual console screen blanker, and won't turn off the backlight | |
1754 | when using the X Window system. This also doesn't have anything to | |
1755 | do with your VESA-compliant power-saving monitor. Further, this | |
1756 | option doesn't work for all laptops -- it might not turn off your | |
1757 | backlight at all, or it might print a lot of errors to the console, | |
1758 | especially if you are using gpm. | |
1759 | ||
1760 | config APM_ALLOW_INTS | |
1761 | bool "Allow interrupts during APM BIOS calls" | |
8f9ca475 | 1762 | ---help--- |
e279b6c1 SR |
1763 | Normally we disable external interrupts while we are making calls to |
1764 | the APM BIOS as a measure to lessen the effects of a badly behaving | |
1765 | BIOS implementation. The BIOS should reenable interrupts if it | |
1766 | needs to. Unfortunately, some BIOSes do not -- especially those in | |
1767 | many of the newer IBM Thinkpads. If you experience hangs when you | |
1768 | suspend, try setting this to Y. Otherwise, say N. | |
1769 | ||
e279b6c1 SR |
1770 | endif # APM |
1771 | ||
1772 | source "arch/x86/kernel/cpu/cpufreq/Kconfig" | |
1773 | ||
1774 | source "drivers/cpuidle/Kconfig" | |
1775 | ||
27471fdb AH |
1776 | source "drivers/idle/Kconfig" |
1777 | ||
e279b6c1 SR |
1778 | endmenu |
1779 | ||
1780 | ||
1781 | menu "Bus options (PCI etc.)" | |
1782 | ||
1783 | config PCI | |
1ac97018 | 1784 | bool "PCI support" |
1c858087 | 1785 | default y |
e279b6c1 | 1786 | select ARCH_SUPPORTS_MSI if (X86_LOCAL_APIC && X86_IO_APIC) |
8f9ca475 | 1787 | ---help--- |
e279b6c1 SR |
1788 | Find out whether you have a PCI motherboard. PCI is the name of a |
1789 | bus system, i.e. the way the CPU talks to the other stuff inside | |
1790 | your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or | |
1791 | VESA. If you have PCI, say Y, otherwise N. | |
1792 | ||
e279b6c1 SR |
1793 | choice |
1794 | prompt "PCI access mode" | |
efefa6f6 | 1795 | depends on X86_32 && PCI |
e279b6c1 SR |
1796 | default PCI_GOANY |
1797 | ---help--- | |
1798 | On PCI systems, the BIOS can be used to detect the PCI devices and | |
1799 | determine their configuration. However, some old PCI motherboards | |
1800 | have BIOS bugs and may crash if this is done. Also, some embedded | |
1801 | PCI-based systems don't have any BIOS at all. Linux can also try to | |
1802 | detect the PCI hardware directly without using the BIOS. | |
1803 | ||
1804 | With this option, you can specify how Linux should detect the | |
1805 | PCI devices. If you choose "BIOS", the BIOS will be used, | |
1806 | if you choose "Direct", the BIOS won't be used, and if you | |
1807 | choose "MMConfig", then PCI Express MMCONFIG will be used. | |
1808 | If you choose "Any", the kernel will try MMCONFIG, then the | |
1809 | direct access method and falls back to the BIOS if that doesn't | |
1810 | work. If unsure, go with the default, which is "Any". | |
1811 | ||
1812 | config PCI_GOBIOS | |
1813 | bool "BIOS" | |
1814 | ||
1815 | config PCI_GOMMCONFIG | |
1816 | bool "MMConfig" | |
1817 | ||
1818 | config PCI_GODIRECT | |
1819 | bool "Direct" | |
1820 | ||
3ef0e1f8 AS |
1821 | config PCI_GOOLPC |
1822 | bool "OLPC" | |
1823 | depends on OLPC | |
1824 | ||
2bdd1b03 AS |
1825 | config PCI_GOANY |
1826 | bool "Any" | |
1827 | ||
e279b6c1 SR |
1828 | endchoice |
1829 | ||
1830 | config PCI_BIOS | |
3c2362e6 | 1831 | def_bool y |
efefa6f6 | 1832 | depends on X86_32 && PCI && (PCI_GOBIOS || PCI_GOANY) |
e279b6c1 SR |
1833 | |
1834 | # x86-64 doesn't support PCI BIOS access from long mode so always go direct. | |
1835 | config PCI_DIRECT | |
3c2362e6 | 1836 | def_bool y |
efefa6f6 | 1837 | depends on PCI && (X86_64 || (PCI_GODIRECT || PCI_GOANY || PCI_GOOLPC)) |
e279b6c1 SR |
1838 | |
1839 | config PCI_MMCONFIG | |
3c2362e6 | 1840 | def_bool y |
e279b6c1 | 1841 | depends on X86_32 && PCI && ACPI && (PCI_GOMMCONFIG || PCI_GOANY) |
e279b6c1 | 1842 | |
3ef0e1f8 | 1843 | config PCI_OLPC |
2bdd1b03 AS |
1844 | def_bool y |
1845 | depends on PCI && OLPC && (PCI_GOOLPC || PCI_GOANY) | |
3ef0e1f8 | 1846 | |
e279b6c1 | 1847 | config PCI_DOMAINS |
3c2362e6 | 1848 | def_bool y |
e279b6c1 | 1849 | depends on PCI |
e279b6c1 SR |
1850 | |
1851 | config PCI_MMCONFIG | |
1852 | bool "Support mmconfig PCI config space access" | |
1853 | depends on X86_64 && PCI && ACPI | |
1854 | ||
1855 | config DMAR | |
1856 | bool "Support for DMA Remapping Devices (EXPERIMENTAL)" | |
4cf2e75d | 1857 | depends on PCI_MSI && ACPI && EXPERIMENTAL |
e279b6c1 SR |
1858 | help |
1859 | DMA remapping (DMAR) devices support enables independent address | |
1860 | translations for Direct Memory Access (DMA) from devices. | |
1861 | These DMA remapping devices are reported via ACPI tables | |
1862 | and include PCI device scope covered by these DMA | |
1863 | remapping devices. | |
1864 | ||
0cd5c3c8 | 1865 | config DMAR_DEFAULT_ON |
f6be37fd | 1866 | def_bool y |
0cd5c3c8 KM |
1867 | prompt "Enable DMA Remapping Devices by default" |
1868 | depends on DMAR | |
1869 | help | |
1870 | Selecting this option will enable a DMAR device at boot time if | |
1871 | one is found. If this option is not selected, DMAR support can | |
1872 | be enabled by passing intel_iommu=on to the kernel. It is | |
1873 | recommended you say N here while the DMAR code remains | |
1874 | experimental. | |
1875 | ||
e279b6c1 | 1876 | config DMAR_GFX_WA |
3c2362e6 HH |
1877 | def_bool y |
1878 | prompt "Support for Graphics workaround" | |
e279b6c1 | 1879 | depends on DMAR |
8f9ca475 IM |
1880 | ---help--- |
1881 | Current Graphics drivers tend to use physical address | |
1882 | for DMA and avoid using DMA APIs. Setting this config | |
1883 | option permits the IOMMU driver to set a unity map for | |
1884 | all the OS-visible memory. Hence the driver can continue | |
1885 | to use physical addresses for DMA. | |
e279b6c1 SR |
1886 | |
1887 | config DMAR_FLOPPY_WA | |
3c2362e6 | 1888 | def_bool y |
e279b6c1 | 1889 | depends on DMAR |
8f9ca475 IM |
1890 | ---help--- |
1891 | Floppy disk drivers are know to bypass DMA API calls | |
1892 | thereby failing to work when IOMMU is enabled. This | |
1893 | workaround will setup a 1:1 mapping for the first | |
1894 | 16M to make floppy (an ISA device) work. | |
e279b6c1 | 1895 | |
9fa8c481 SS |
1896 | config INTR_REMAP |
1897 | bool "Support for Interrupt Remapping (EXPERIMENTAL)" | |
1898 | depends on X86_64 && X86_IO_APIC && PCI_MSI && ACPI && EXPERIMENTAL | |
8f9ca475 IM |
1899 | ---help--- |
1900 | Supports Interrupt remapping for IO-APIC and MSI devices. | |
1901 | To use x2apic mode in the CPU's which support x2APIC enhancements or | |
1902 | to support platforms with CPU's having > 8 bit APIC ID, say Y. | |
9fa8c481 | 1903 | |
e279b6c1 SR |
1904 | source "drivers/pci/pcie/Kconfig" |
1905 | ||
1906 | source "drivers/pci/Kconfig" | |
1907 | ||
1908 | # x86_64 have no ISA slots, but do have ISA-style DMA. | |
1909 | config ISA_DMA_API | |
3c2362e6 | 1910 | def_bool y |
e279b6c1 SR |
1911 | |
1912 | if X86_32 | |
1913 | ||
1914 | config ISA | |
1915 | bool "ISA support" | |
8f9ca475 | 1916 | ---help--- |
e279b6c1 SR |
1917 | Find out whether you have ISA slots on your motherboard. ISA is the |
1918 | name of a bus system, i.e. the way the CPU talks to the other stuff | |
1919 | inside your box. Other bus systems are PCI, EISA, MicroChannel | |
1920 | (MCA) or VESA. ISA is an older system, now being displaced by PCI; | |
1921 | newer boards don't support it. If you have ISA, say Y, otherwise N. | |
1922 | ||
1923 | config EISA | |
1924 | bool "EISA support" | |
1925 | depends on ISA | |
1926 | ---help--- | |
1927 | The Extended Industry Standard Architecture (EISA) bus was | |
1928 | developed as an open alternative to the IBM MicroChannel bus. | |
1929 | ||
1930 | The EISA bus provided some of the features of the IBM MicroChannel | |
1931 | bus while maintaining backward compatibility with cards made for | |
1932 | the older ISA bus. The EISA bus saw limited use between 1988 and | |
1933 | 1995 when it was made obsolete by the PCI bus. | |
1934 | ||
1935 | Say Y here if you are building a kernel for an EISA-based machine. | |
1936 | ||
1937 | Otherwise, say N. | |
1938 | ||
1939 | source "drivers/eisa/Kconfig" | |
1940 | ||
1941 | config MCA | |
72ee6ebb | 1942 | bool "MCA support" |
8f9ca475 | 1943 | ---help--- |
e279b6c1 SR |
1944 | MicroChannel Architecture is found in some IBM PS/2 machines and |
1945 | laptops. It is a bus system similar to PCI or ISA. See | |
1946 | <file:Documentation/mca.txt> (and especially the web page given | |
1947 | there) before attempting to build an MCA bus kernel. | |
1948 | ||
1949 | source "drivers/mca/Kconfig" | |
1950 | ||
1951 | config SCx200 | |
1952 | tristate "NatSemi SCx200 support" | |
8f9ca475 | 1953 | ---help--- |
e279b6c1 SR |
1954 | This provides basic support for National Semiconductor's |
1955 | (now AMD's) Geode processors. The driver probes for the | |
1956 | PCI-IDs of several on-chip devices, so its a good dependency | |
1957 | for other scx200_* drivers. | |
1958 | ||
1959 | If compiled as a module, the driver is named scx200. | |
1960 | ||
1961 | config SCx200HR_TIMER | |
1962 | tristate "NatSemi SCx200 27MHz High-Resolution Timer Support" | |
1963 | depends on SCx200 && GENERIC_TIME | |
1964 | default y | |
8f9ca475 | 1965 | ---help--- |
e279b6c1 SR |
1966 | This driver provides a clocksource built upon the on-chip |
1967 | 27MHz high-resolution timer. Its also a workaround for | |
1968 | NSC Geode SC-1100's buggy TSC, which loses time when the | |
1969 | processor goes idle (as is done by the scheduler). The | |
1970 | other workaround is idle=poll boot option. | |
1971 | ||
1972 | config GEODE_MFGPT_TIMER | |
3c2362e6 HH |
1973 | def_bool y |
1974 | prompt "Geode Multi-Function General Purpose Timer (MFGPT) events" | |
e279b6c1 | 1975 | depends on MGEODE_LX && GENERIC_TIME && GENERIC_CLOCKEVENTS |
8f9ca475 | 1976 | ---help--- |
e279b6c1 SR |
1977 | This driver provides a clock event source based on the MFGPT |
1978 | timer(s) in the CS5535 and CS5536 companion chip for the geode. | |
1979 | MFGPTs have a better resolution and max interval than the | |
1980 | generic PIT, and are suitable for use as high-res timers. | |
1981 | ||
3ef0e1f8 AS |
1982 | config OLPC |
1983 | bool "One Laptop Per Child support" | |
1984 | default n | |
8f9ca475 | 1985 | ---help--- |
3ef0e1f8 AS |
1986 | Add support for detecting the unique features of the OLPC |
1987 | XO hardware. | |
1988 | ||
bc0120fd SR |
1989 | endif # X86_32 |
1990 | ||
e279b6c1 SR |
1991 | config K8_NB |
1992 | def_bool y | |
bc0120fd | 1993 | depends on AGP_AMD64 || (X86_64 && (GART_IOMMU || (PCI && NUMA))) |
e279b6c1 SR |
1994 | |
1995 | source "drivers/pcmcia/Kconfig" | |
1996 | ||
1997 | source "drivers/pci/hotplug/Kconfig" | |
1998 | ||
1999 | endmenu | |
2000 | ||
2001 | ||
2002 | menu "Executable file formats / Emulations" | |
2003 | ||
2004 | source "fs/Kconfig.binfmt" | |
2005 | ||
2006 | config IA32_EMULATION | |
2007 | bool "IA32 Emulation" | |
2008 | depends on X86_64 | |
a97f52e6 | 2009 | select COMPAT_BINFMT_ELF |
8f9ca475 | 2010 | ---help--- |
e279b6c1 SR |
2011 | Include code to run 32-bit programs under a 64-bit kernel. You should |
2012 | likely turn this on, unless you're 100% sure that you don't have any | |
2013 | 32-bit programs left. | |
2014 | ||
2015 | config IA32_AOUT | |
8f9ca475 IM |
2016 | tristate "IA32 a.out support" |
2017 | depends on IA32_EMULATION | |
2018 | ---help--- | |
2019 | Support old a.out binaries in the 32bit emulation. | |
e279b6c1 SR |
2020 | |
2021 | config COMPAT | |
3c2362e6 | 2022 | def_bool y |
e279b6c1 | 2023 | depends on IA32_EMULATION |
e279b6c1 SR |
2024 | |
2025 | config COMPAT_FOR_U64_ALIGNMENT | |
2026 | def_bool COMPAT | |
2027 | depends on X86_64 | |
2028 | ||
2029 | config SYSVIPC_COMPAT | |
3c2362e6 | 2030 | def_bool y |
b8992195 | 2031 | depends on COMPAT && SYSVIPC |
e279b6c1 SR |
2032 | |
2033 | endmenu | |
2034 | ||
2035 | ||
e5beae16 KP |
2036 | config HAVE_ATOMIC_IOMAP |
2037 | def_bool y | |
2038 | depends on X86_32 | |
2039 | ||
e279b6c1 SR |
2040 | source "net/Kconfig" |
2041 | ||
2042 | source "drivers/Kconfig" | |
2043 | ||
2044 | source "drivers/firmware/Kconfig" | |
2045 | ||
2046 | source "fs/Kconfig" | |
2047 | ||
e279b6c1 SR |
2048 | source "arch/x86/Kconfig.debug" |
2049 | ||
2050 | source "security/Kconfig" | |
2051 | ||
2052 | source "crypto/Kconfig" | |
2053 | ||
edf88417 AK |
2054 | source "arch/x86/kvm/Kconfig" |
2055 | ||
e279b6c1 | 2056 | source "lib/Kconfig" |