Commit | Line | Data |
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1da177e4 LT |
1 | # |
2 | # For a description of the syntax of this configuration file, | |
3 | # see Documentation/kbuild/kconfig-language.txt. | |
4 | # | |
5 | # Note: ISA is disabled and will hopefully never be enabled. | |
6 | # If you managed to buy an ISA x86-64 box you'll have to fix all the | |
7 | # ISA drivers you need yourself. | |
8 | # | |
9 | ||
10 | mainmenu "Linux Kernel Configuration" | |
11 | ||
12 | config X86_64 | |
13 | bool | |
14 | default y | |
15 | help | |
16 | Port to the x86-64 architecture. x86-64 is a 64-bit extension to the | |
17 | classical 32-bit x86 architecture. For details see | |
18 | <http://www.x86-64.org/>. | |
19 | ||
20 | config 64BIT | |
21 | def_bool y | |
22 | ||
23 | config X86 | |
24 | bool | |
25 | default y | |
26 | ||
fb0e7942 CL |
27 | config ZONE_DMA32 |
28 | bool | |
29 | default y | |
30 | ||
1e950527 IM |
31 | config LOCKDEP_SUPPORT |
32 | bool | |
33 | default y | |
34 | ||
21b32bbf IM |
35 | config STACKTRACE_SUPPORT |
36 | bool | |
37 | default y | |
38 | ||
52fdd089 BL |
39 | config SEMAPHORE_SLEEPERS |
40 | bool | |
41 | default y | |
42 | ||
1da177e4 LT |
43 | config MMU |
44 | bool | |
45 | default y | |
46 | ||
47 | config ISA | |
48 | bool | |
49 | ||
50 | config SBUS | |
51 | bool | |
52 | ||
53 | config RWSEM_GENERIC_SPINLOCK | |
54 | bool | |
55 | default y | |
56 | ||
57 | config RWSEM_XCHGADD_ALGORITHM | |
58 | bool | |
59 | ||
f33e2fba AM |
60 | config GENERIC_HWEIGHT |
61 | bool | |
62 | default y | |
63 | ||
1da177e4 LT |
64 | config GENERIC_CALIBRATE_DELAY |
65 | bool | |
66 | default y | |
67 | ||
68 | config X86_CMPXCHG | |
69 | bool | |
70 | default y | |
71 | ||
72 | config EARLY_PRINTK | |
73 | bool | |
74 | default y | |
75 | ||
76 | config GENERIC_ISA_DMA | |
77 | bool | |
78 | default y | |
79 | ||
80 | config GENERIC_IOMAP | |
81 | bool | |
82 | default y | |
83 | ||
a08b6b79 Z |
84 | config ARCH_MAY_HAVE_PC_FDC |
85 | bool | |
86 | default y | |
87 | ||
5cb248ab MG |
88 | config ARCH_POPULATES_NODE_MAP |
89 | def_bool y | |
90 | ||
e9928674 AK |
91 | config DMI |
92 | bool | |
93 | default y | |
94 | ||
e65e1fc2 AV |
95 | config AUDIT_ARCH |
96 | bool | |
97 | default y | |
98 | ||
c31a0bf3 JF |
99 | config GENERIC_BUG |
100 | bool | |
101 | default y | |
102 | depends on BUG | |
103 | ||
f0d1b0b3 DH |
104 | config ARCH_HAS_ILOG2_U32 |
105 | bool | |
106 | default n | |
107 | ||
108 | config ARCH_HAS_ILOG2_U64 | |
109 | bool | |
110 | default n | |
111 | ||
1da177e4 LT |
112 | source "init/Kconfig" |
113 | ||
114 | ||
115 | menu "Processor type and features" | |
116 | ||
79f12614 RT |
117 | choice |
118 | prompt "Subarchitecture Type" | |
119 | default X86_PC | |
120 | ||
121 | config X86_PC | |
122 | bool "PC-compatible" | |
123 | help | |
124 | Choose this option if your computer is a standard PC or compatible. | |
125 | ||
126 | config X86_VSMP | |
127 | bool "Support for ScaleMP vSMP" | |
f157cbb1 | 128 | depends on PCI |
79f12614 RT |
129 | help |
130 | Support for ScaleMP vSMP systems. Say 'Y' here if this kernel is | |
131 | supposed to run on these EM64T-based machines. Only choose this option | |
132 | if you have one of these machines. | |
133 | ||
134 | endchoice | |
135 | ||
1da177e4 LT |
136 | choice |
137 | prompt "Processor family" | |
71381998 | 138 | default GENERIC_CPU |
1da177e4 LT |
139 | |
140 | config MK8 | |
141 | bool "AMD-Opteron/Athlon64" | |
142 | help | |
143 | Optimize for AMD Opteron/Athlon64/Hammer/K8 CPUs. | |
144 | ||
145 | config MPSC | |
71381998 | 146 | bool "Intel P4 / older Netburst based Xeon" |
1da177e4 | 147 | help |
71381998 AK |
148 | Optimize for Intel Pentium 4 and older Nocona/Dempsey Xeon CPUs |
149 | with Intel Extended Memory 64 Technology(EM64T). For details see | |
1da177e4 | 150 | <http://www.intel.com/technology/64bitextensions/>. |
71381998 AK |
151 | Note the the latest Xeons (Xeon 51xx and 53xx) are not based on the |
152 | Netburst core and shouldn't use this option. You can distingush them | |
153 | using the cpu family field | |
154 | in /proc/cpuinfo. Family 15 is a older Xeon, Family 6 a newer one | |
155 | (this rule only applies to system that support EM64T) | |
156 | ||
157 | config MCORE2 | |
158 | bool "Intel Core2 / newer Xeon" | |
159 | help | |
160 | Optimize for Intel Core2 and newer Xeons (51xx) | |
161 | You can distingush the newer Xeons from the older ones using | |
162 | the cpu family field in /proc/cpuinfo. 15 is a older Xeon | |
163 | (use CONFIG_MPSC then), 6 is a newer one. This rule only | |
164 | applies to CPUs that support EM64T. | |
1da177e4 LT |
165 | |
166 | config GENERIC_CPU | |
167 | bool "Generic-x86-64" | |
168 | help | |
169 | Generic x86-64 CPU. | |
71381998 | 170 | Run equally well on all x86-64 CPUs. |
1da177e4 LT |
171 | |
172 | endchoice | |
173 | ||
174 | # | |
175 | # Define implied options from the CPU selection here | |
176 | # | |
177 | config X86_L1_CACHE_BYTES | |
178 | int | |
179 | default "128" if GENERIC_CPU || MPSC | |
71381998 | 180 | default "64" if MK8 || MCORE2 |
1da177e4 LT |
181 | |
182 | config X86_L1_CACHE_SHIFT | |
183 | int | |
184 | default "7" if GENERIC_CPU || MPSC | |
71381998 | 185 | default "6" if MK8 || MCORE2 |
1da177e4 | 186 | |
e405d067 RT |
187 | config X86_INTERNODE_CACHE_BYTES |
188 | int | |
189 | default "4096" if X86_VSMP | |
190 | default X86_L1_CACHE_BYTES if !X86_VSMP | |
191 | ||
1da177e4 LT |
192 | config X86_TSC |
193 | bool | |
194 | default y | |
195 | ||
196 | config X86_GOOD_APIC | |
197 | bool | |
198 | default y | |
199 | ||
200 | config MICROCODE | |
201 | tristate "/dev/cpu/microcode - Intel CPU microcode support" | |
9a4b9efa | 202 | select FW_LOADER |
1da177e4 LT |
203 | ---help--- |
204 | If you say Y here the 'File systems' section, you will be | |
205 | able to update the microcode on Intel processors. You will | |
206 | obviously need the actual microcode binary data itself which is | |
207 | not shipped with the Linux kernel. | |
208 | ||
209 | For latest news and information on obtaining all the required | |
210 | ingredients for this driver, check: | |
211 | <http://www.urbanmyth.org/microcode/>. | |
212 | ||
213 | To compile this driver as a module, choose M here: the | |
214 | module will be called microcode. | |
215 | If you use modprobe or kmod you may also want to add the line | |
216 | 'alias char-major-10-184 microcode' to your /etc/modules.conf file. | |
217 | ||
9a3110bf SL |
218 | config MICROCODE_OLD_INTERFACE |
219 | bool | |
220 | depends on MICROCODE | |
221 | default y | |
222 | ||
1da177e4 LT |
223 | config X86_MSR |
224 | tristate "/dev/cpu/*/msr - Model-specific register support" | |
225 | help | |
226 | This device gives privileged processes access to the x86 | |
227 | Model-Specific Registers (MSRs). It is a character device with | |
228 | major 202 and minors 0 to 31 for /dev/cpu/0/msr to /dev/cpu/31/msr. | |
229 | MSR accesses are directed to a specific CPU on multi-processor | |
230 | systems. | |
231 | ||
232 | config X86_CPUID | |
233 | tristate "/dev/cpu/*/cpuid - CPU information support" | |
234 | help | |
235 | This device gives processes access to the x86 CPUID instruction to | |
236 | be executed on a specific processor. It is a character device | |
237 | with major 203 and minors 0 to 31 for /dev/cpu/0/cpuid to | |
238 | /dev/cpu/31/cpuid. | |
239 | ||
1da177e4 LT |
240 | config X86_HT |
241 | bool | |
242 | depends on SMP && !MK8 | |
243 | default y | |
244 | ||
245 | config MATH_EMULATION | |
246 | bool | |
247 | ||
248 | config MCA | |
249 | bool | |
250 | ||
251 | config EISA | |
252 | bool | |
253 | ||
254 | config X86_IO_APIC | |
255 | bool | |
256 | default y | |
257 | ||
258 | config X86_LOCAL_APIC | |
259 | bool | |
260 | default y | |
261 | ||
262 | config MTRR | |
263 | bool "MTRR (Memory Type Range Register) support" | |
264 | ---help--- | |
265 | On Intel P6 family processors (Pentium Pro, Pentium II and later) | |
266 | the Memory Type Range Registers (MTRRs) may be used to control | |
267 | processor access to memory ranges. This is most useful if you have | |
268 | a video (VGA) card on a PCI or AGP bus. Enabling write-combining | |
269 | allows bus write transfers to be combined into a larger transfer | |
270 | before bursting over the PCI/AGP bus. This can increase performance | |
271 | of image write operations 2.5 times or more. Saying Y here creates a | |
272 | /proc/mtrr file which may be used to manipulate your processor's | |
273 | MTRRs. Typically the X server should use this. | |
274 | ||
275 | This code has a reasonably generic interface so that similar | |
276 | control registers on other processors can be easily supported | |
277 | as well. | |
278 | ||
279 | Saying Y here also fixes a problem with buggy SMP BIOSes which only | |
280 | set the MTRRs for the boot CPU and not for the secondary CPUs. This | |
281 | can lead to all sorts of problems, so it's good to say Y here. | |
282 | ||
283 | Just say Y here, all x86-64 machines support MTRRs. | |
284 | ||
285 | See <file:Documentation/mtrr.txt> for more information. | |
286 | ||
287 | config SMP | |
288 | bool "Symmetric multi-processing support" | |
289 | ---help--- | |
290 | This enables support for systems with more than one CPU. If you have | |
291 | a system with only one CPU, like most personal computers, say N. If | |
292 | you have a system with more than one CPU, say Y. | |
293 | ||
294 | If you say N here, the kernel will run on single and multiprocessor | |
295 | machines, but will use only one CPU of a multiprocessor machine. If | |
296 | you say Y here, the kernel will run on many, but not all, | |
297 | singleprocessor machines. On a singleprocessor machine, the kernel | |
298 | will run faster if you say N here. | |
299 | ||
300 | If you don't know what to do here, say N. | |
301 | ||
1da177e4 LT |
302 | config SCHED_SMT |
303 | bool "SMT (Hyperthreading) scheduler support" | |
304 | depends on SMP | |
305 | default n | |
306 | help | |
307 | SMT scheduler support improves the CPU scheduler's decision making | |
308 | when dealing with Intel Pentium 4 chips with HyperThreading at a | |
309 | cost of slightly increased overhead in some places. If unsure say | |
310 | N here. | |
311 | ||
1e9f28fa SS |
312 | config SCHED_MC |
313 | bool "Multi-core scheduler support" | |
314 | depends on SMP | |
315 | default y | |
316 | help | |
317 | Multi-core scheduler support improves the CPU scheduler's decision | |
318 | making when dealing with multi-core CPU chips at a cost of slightly | |
319 | increased overhead in some places. If unsure say N here. | |
320 | ||
cc19ca86 IM |
321 | source "kernel/Kconfig.preempt" |
322 | ||
b0bd35e6 RT |
323 | config NUMA |
324 | bool "Non Uniform Memory Access (NUMA) Support" | |
1da177e4 LT |
325 | depends on SMP |
326 | help | |
b0bd35e6 RT |
327 | Enable NUMA (Non Uniform Memory Access) support. The kernel |
328 | will try to allocate memory used by a CPU on the local memory | |
329 | controller of the CPU and add some more NUMA awareness to the kernel. | |
330 | This code is recommended on all multiprocessor Opteron systems. | |
331 | If the system is EM64T, you should say N unless your system is EM64T | |
332 | NUMA. | |
333 | ||
334 | config K8_NUMA | |
335 | bool "Old style AMD Opteron NUMA detection" | |
f157cbb1 | 336 | depends on NUMA && PCI |
b0bd35e6 RT |
337 | default y |
338 | help | |
339 | Enable K8 NUMA node topology detection. You should say Y here if | |
340 | you have a multi processor AMD K8 system. This uses an old | |
44c09201 | 341 | method to read the NUMA configuration directly from the builtin |
b0bd35e6 RT |
342 | Northbridge of Opteron. It is recommended to use X86_64_ACPI_NUMA |
343 | instead, which also takes priority if both are compiled in. | |
344 | ||
c80d79d7 YG |
345 | config NODES_SHIFT |
346 | int | |
347 | default "6" | |
348 | depends on NEED_MULTIPLE_NODES | |
349 | ||
b0bd35e6 RT |
350 | # Dummy CONFIG option to select ACPI_NUMA from drivers/acpi/Kconfig. |
351 | ||
352 | config X86_64_ACPI_NUMA | |
353 | bool "ACPI NUMA detection" | |
354 | depends on NUMA | |
355 | select ACPI | |
1300124f | 356 | select PCI |
b0bd35e6 RT |
357 | select ACPI_NUMA |
358 | default y | |
359 | help | |
360 | Enable ACPI SRAT based node topology detection. | |
1da177e4 LT |
361 | |
362 | config NUMA_EMU | |
b0bd35e6 RT |
363 | bool "NUMA emulation" |
364 | depends on NUMA | |
1da177e4 LT |
365 | help |
366 | Enable NUMA emulation. A flat machine will be split | |
367 | into virtual nodes when booted with "numa=fake=N", where N is the | |
368 | number of nodes. This is only useful for debugging. | |
369 | ||
3f22ab27 | 370 | config ARCH_DISCONTIGMEM_ENABLE |
1da177e4 LT |
371 | bool |
372 | depends on NUMA | |
373 | default y | |
374 | ||
1035faf1 MT |
375 | config ARCH_DISCONTIGMEM_DEFAULT |
376 | def_bool y | |
377 | depends on NUMA | |
378 | ||
379 | config ARCH_SPARSEMEM_ENABLE | |
380 | def_bool y | |
44df75e6 MT |
381 | depends on (NUMA || EXPERIMENTAL) |
382 | ||
383 | config ARCH_MEMORY_PROBE | |
384 | def_bool y | |
385 | depends on MEMORY_HOTPLUG | |
1035faf1 MT |
386 | |
387 | config ARCH_FLATMEM_ENABLE | |
388 | def_bool y | |
389 | depends on !NUMA | |
390 | ||
3f22ab27 DH |
391 | source "mm/Kconfig" |
392 | ||
ec69acbb KM |
393 | config MEMORY_HOTPLUG_RESERVE |
394 | def_bool y | |
395 | depends on (MEMORY_HOTPLUG && DISCONTIGMEM) | |
396 | ||
1035faf1 MT |
397 | config HAVE_ARCH_EARLY_PFN_TO_NID |
398 | def_bool y | |
44df75e6 | 399 | depends on NUMA |
1035faf1 | 400 | |
dc8ecb43 KH |
401 | config OUT_OF_LINE_PFN_TO_PAGE |
402 | def_bool y | |
403 | depends on DISCONTIGMEM | |
404 | ||
1da177e4 LT |
405 | config NR_CPUS |
406 | int "Maximum number of CPUs (2-256)" | |
01d4bed4 | 407 | range 2 255 |
1da177e4 LT |
408 | depends on SMP |
409 | default "8" | |
410 | help | |
411 | This allows you to specify the maximum number of CPUs which this | |
412 | kernel will support. Current maximum is 256 CPUs due to | |
413 | APIC addressing limits. Less depending on the hardware. | |
414 | ||
415 | This is purely to save memory - each supported CPU requires | |
416 | memory in the static kernel configuration. | |
417 | ||
76e4f660 AR |
418 | config HOTPLUG_CPU |
419 | bool "Support for hot-pluggable CPUs (EXPERIMENTAL)" | |
420 | depends on SMP && HOTPLUG && EXPERIMENTAL | |
421 | help | |
422 | Say Y here to experiment with turning CPUs off and on. CPUs | |
423 | can be controlled through /sys/devices/system/cpu/cpu#. | |
424 | Say N if you want to disable CPU hotplug. | |
425 | ||
cc57637b YG |
426 | config ARCH_ENABLE_MEMORY_HOTPLUG |
427 | def_bool y | |
76e4f660 | 428 | |
1da177e4 LT |
429 | config HPET_TIMER |
430 | bool | |
431 | default y | |
432 | help | |
433 | Use the IA-PC HPET (High Precision Event Timer) to manage | |
434 | time in preference to the PIT and RTC, if a HPET is | |
435 | present. The HPET provides a stable time base on SMP | |
436 | systems, unlike the TSC, but it is more expensive to access, | |
437 | as it is off-chip. You can find the HPET spec at | |
89d7cbf7 | 438 | <http://www.intel.com/hardwaredesign/hpetspec.htm>. |
1da177e4 LT |
439 | |
440 | config HPET_EMULATE_RTC | |
441 | bool "Provide RTC interrupt" | |
442 | depends on HPET_TIMER && RTC=y | |
443 | ||
a813ce43 AK |
444 | # Mark as embedded because too many people got it wrong. |
445 | # The code disables itself when not needed. | |
446 | config IOMMU | |
447 | bool "IOMMU support" if EMBEDDED | |
a54649b8 | 448 | default y |
17a941d8 | 449 | select SWIOTLB |
dcc1a66a | 450 | select AGP |
1da177e4 LT |
451 | depends on PCI |
452 | help | |
a813ce43 AK |
453 | Support for full DMA access of devices with 32bit memory access only |
454 | on systems with more than 3GB. This is usually needed for USB, | |
455 | sound, many IDE/SATA chipsets and some other devices. | |
456 | Provides a driver for the AMD Athlon64/Opteron/Turion/Sempron GART | |
457 | based IOMMU and a software bounce buffer based IOMMU used on Intel | |
458 | systems and as fallback. | |
459 | The code is only active when needed (enough memory and limited | |
460 | device) unless CONFIG_IOMMU_DEBUG or iommu=force is specified | |
461 | too. | |
462 | ||
e465058d JM |
463 | config CALGARY_IOMMU |
464 | bool "IBM Calgary IOMMU support" | |
e465058d JM |
465 | select SWIOTLB |
466 | depends on PCI && EXPERIMENTAL | |
467 | help | |
468 | Support for hardware IOMMUs in IBM's xSeries x366 and x460 | |
469 | systems. Needed to run systems with more than 3GB of memory | |
470 | properly with 32-bit PCI devices that do not support DAC | |
471 | (Double Address Cycle). Calgary also supports bus level | |
472 | isolation, where all DMAs pass through the IOMMU. This | |
473 | prevents them from going anywhere except their intended | |
474 | destination. This catches hard-to-find kernel bugs and | |
475 | mis-behaving drivers and devices that do not use the DMA-API | |
476 | properly to set up their DMA buffers. The IOMMU can be | |
477 | turned off at boot time with the iommu=off parameter. | |
478 | Normally the kernel will make the right choice by itself. | |
479 | If unsure, say Y. | |
480 | ||
bff6547b MBY |
481 | config CALGARY_IOMMU_ENABLED_BY_DEFAULT |
482 | bool "Should Calgary be enabled by default?" | |
483 | default y | |
484 | depends on CALGARY_IOMMU | |
485 | help | |
486 | Should Calgary be enabled by default? if you choose 'y', Calgary | |
487 | will be used (if it exists). If you choose 'n', Calgary will not be | |
488 | used even if it exists. If you choose 'n' and would like to use | |
489 | Calgary anyway, pass 'iommu=calgary' on the kernel command line. | |
490 | If unsure, say Y. | |
491 | ||
a813ce43 | 492 | # need this always selected by IOMMU for the VIA workaround |
1da177e4 | 493 | config SWIOTLB |
1da177e4 | 494 | bool |
1da177e4 LT |
495 | |
496 | config X86_MCE | |
497 | bool "Machine check support" if EMBEDDED | |
498 | default y | |
499 | help | |
500 | Include a machine check error handler to report hardware errors. | |
501 | This version will require the mcelog utility to decode some | |
502 | machine check error logs. See | |
503 | ftp://ftp.x86-64.org/pub/linux/tools/mcelog | |
504 | ||
505 | config X86_MCE_INTEL | |
506 | bool "Intel MCE features" | |
507 | depends on X86_MCE && X86_LOCAL_APIC | |
508 | default y | |
509 | help | |
510 | Additional support for intel specific MCE features such as | |
511 | the thermal monitor. | |
512 | ||
89b831ef JS |
513 | config X86_MCE_AMD |
514 | bool "AMD MCE features" | |
515 | depends on X86_MCE && X86_LOCAL_APIC | |
516 | default y | |
517 | help | |
518 | Additional support for AMD specific MCE features such as | |
519 | the DRAM Error Threshold. | |
520 | ||
5234f5eb | 521 | config KEXEC |
1c9c0a6c | 522 | bool "kexec system call" |
5234f5eb EB |
523 | help |
524 | kexec is a system call that implements the ability to shutdown your | |
525 | current kernel, and to start another kernel. It is like a reboot | |
1f1332f7 | 526 | but it is independent of the system firmware. And like a reboot |
5234f5eb EB |
527 | you can start any kernel with it, not just Linux. |
528 | ||
1f1332f7 | 529 | The name comes from the similarity to the exec system call. |
5234f5eb EB |
530 | |
531 | It is an ongoing process to be certain the hardware in a machine | |
532 | is properly shutdown, so do not be surprised if this code does not | |
533 | initially work for you. It may help to enable device hotplugging | |
534 | support. As of this writing the exact hardware interface is | |
535 | strongly in flux, so no good recommendation can be made. | |
536 | ||
ec9ce0db VG |
537 | config CRASH_DUMP |
538 | bool "kernel crash dumps (EXPERIMENTAL)" | |
ec9ce0db VG |
539 | depends on EXPERIMENTAL |
540 | help | |
1edf7778 AK |
541 | Generate crash dump after being started by kexec. |
542 | This should be normally only set in special crash dump kernels | |
543 | which are loaded in the main kernel with kexec-tools into | |
544 | a specially reserved region and then later executed after | |
545 | a crash by kdump/kexec. The crash dump kernel must be compiled | |
546 | to a memory address not used by the main kernel or BIOS using | |
547 | PHYSICAL_START. | |
548 | For more details see Documentation/kdump/kdump.txt | |
ec9ce0db | 549 | |
05970d47 MS |
550 | config PHYSICAL_START |
551 | hex "Physical address where the kernel is loaded" if (EMBEDDED || CRASH_DUMP) | |
552 | default "0x1000000" if CRASH_DUMP | |
04103609 | 553 | default "0x200000" |
05970d47 MS |
554 | help |
555 | This gives the physical address where the kernel is loaded. Normally | |
04103609 | 556 | for regular kernels this value is 0x200000 (2MB). But in the case |
05970d47 MS |
557 | of kexec on panic the fail safe kernel needs to run at a different |
558 | address than the panic-ed kernel. This option is used to set the load | |
559 | address for kernels used to capture crash dump on being kexec'ed | |
560 | after panic. The default value for crash dump kernels is | |
561 | 0x1000000 (16MB). This can also be set based on the "X" value as | |
562 | specified in the "crashkernel=YM@XM" command line boot parameter | |
563 | passed to the panic-ed kernel. Typically this parameter is set as | |
564 | crashkernel=64M@16M. Please take a look at | |
565 | Documentation/kdump/kdump.txt for more details about crash dumps. | |
566 | ||
567 | Don't change this unless you know what you are doing. | |
568 | ||
1da177e4 LT |
569 | config SECCOMP |
570 | bool "Enable seccomp to safely compute untrusted bytecode" | |
571 | depends on PROC_FS | |
572 | default y | |
573 | help | |
574 | This kernel feature is useful for number crunching applications | |
575 | that may need to compute untrusted bytecode during their | |
576 | execution. By using pipes or other transports made available to | |
577 | the process as file descriptors supporting the read/write | |
578 | syscalls, it's possible to isolate those applications in | |
579 | their own address space using seccomp. Once seccomp is | |
580 | enabled via /proc/<pid>/seccomp, it cannot be disabled | |
581 | and the task is only allowed to execute a few safe syscalls | |
582 | defined by each seccomp mode. | |
583 | ||
584 | If unsure, say Y. Only embedded should say N here. | |
585 | ||
b62a5c74 AV |
586 | config CC_STACKPROTECTOR |
587 | bool "Enable -fstack-protector buffer overflow detection (EXPRIMENTAL)" | |
588 | depends on EXPERIMENTAL | |
589 | help | |
590 | This option turns on the -fstack-protector GCC feature. This | |
591 | feature puts, at the beginning of critical functions, a canary | |
592 | value on the stack just before the return address, and validates | |
593 | the value just before actually returning. Stack based buffer | |
594 | overflows (that need to overwrite this return address) now also | |
595 | overwrite the canary, which gets detected and the attack is then | |
596 | neutralized via a kernel panic. | |
597 | ||
598 | This feature requires gcc version 4.2 or above, or a distribution | |
599 | gcc with the feature backported. Older versions are automatically | |
600 | detected and for those versions, this configuration option is ignored. | |
601 | ||
602 | config CC_STACKPROTECTOR_ALL | |
603 | bool "Use stack-protector for all functions" | |
604 | depends on CC_STACKPROTECTOR | |
605 | help | |
606 | Normally, GCC only inserts the canary value protection for | |
607 | functions that use large-ish on-stack buffers. By enabling | |
608 | this option, GCC will be asked to do this for ALL functions. | |
609 | ||
59121003 CL |
610 | source kernel/Kconfig.hz |
611 | ||
4bdc3b7f AV |
612 | config REORDER |
613 | bool "Function reordering" | |
614 | default n | |
615 | help | |
616 | This option enables the toolchain to reorder functions for a more | |
617 | optimal TLB usage. If you have pretty much any version of binutils, | |
618 | this can increase your kernel build time by roughly one minute. | |
619 | ||
a32073bf AK |
620 | config K8_NB |
621 | def_bool y | |
a813ce43 | 622 | depends on AGP_AMD64 || IOMMU || (PCI && NUMA) |
a32073bf | 623 | |
1da177e4 LT |
624 | endmenu |
625 | ||
626 | # | |
627 | # Use the generic interrupt handling code in kernel/irq/: | |
628 | # | |
629 | config GENERIC_HARDIRQS | |
630 | bool | |
631 | default y | |
632 | ||
633 | config GENERIC_IRQ_PROBE | |
634 | bool | |
635 | default y | |
636 | ||
5cae841b AV |
637 | # we have no ISA slots, but we do have ISA-style DMA. |
638 | config ISA_DMA_API | |
639 | bool | |
640 | default y | |
641 | ||
54d5d424 AR |
642 | config GENERIC_PENDING_IRQ |
643 | bool | |
644 | depends on GENERIC_HARDIRQS && SMP | |
645 | default y | |
646 | ||
1da177e4 LT |
647 | menu "Power management options" |
648 | ||
649 | source kernel/power/Kconfig | |
650 | ||
651 | source "drivers/acpi/Kconfig" | |
652 | ||
653 | source "arch/x86_64/kernel/cpufreq/Kconfig" | |
654 | ||
655 | endmenu | |
656 | ||
657 | menu "Bus options (PCI etc.)" | |
658 | ||
659 | config PCI | |
660 | bool "PCI support" | |
661 | ||
662 | # x86-64 doesn't support PCI BIOS access from long mode so always go direct. | |
663 | config PCI_DIRECT | |
664 | bool | |
665 | depends on PCI | |
666 | default y | |
667 | ||
668 | config PCI_MMCONFIG | |
669 | bool "Support mmconfig PCI config space access" | |
8aadff7d | 670 | depends on PCI && ACPI |
1da177e4 | 671 | |
1da177e4 LT |
672 | source "drivers/pci/pcie/Kconfig" |
673 | ||
674 | source "drivers/pci/Kconfig" | |
675 | ||
676 | source "drivers/pcmcia/Kconfig" | |
677 | ||
678 | source "drivers/pci/hotplug/Kconfig" | |
679 | ||
680 | endmenu | |
681 | ||
682 | ||
683 | menu "Executable file formats / Emulations" | |
684 | ||
685 | source "fs/Kconfig.binfmt" | |
686 | ||
687 | config IA32_EMULATION | |
688 | bool "IA32 Emulation" | |
689 | help | |
690 | Include code to run 32-bit programs under a 64-bit kernel. You should likely | |
691 | turn this on, unless you're 100% sure that you don't have any 32-bit programs | |
692 | left. | |
693 | ||
694 | config IA32_AOUT | |
ea0be473 | 695 | tristate "IA32 a.out support" |
1da177e4 LT |
696 | depends on IA32_EMULATION |
697 | help | |
698 | Support old a.out binaries in the 32bit emulation. | |
699 | ||
700 | config COMPAT | |
701 | bool | |
702 | depends on IA32_EMULATION | |
703 | default y | |
704 | ||
705 | config SYSVIPC_COMPAT | |
706 | bool | |
707 | depends on COMPAT && SYSVIPC | |
708 | default y | |
709 | ||
1da177e4 LT |
710 | endmenu |
711 | ||
d5950b43 SR |
712 | source "net/Kconfig" |
713 | ||
1da177e4 LT |
714 | source drivers/Kconfig |
715 | ||
716 | source "drivers/firmware/Kconfig" | |
717 | ||
718 | source fs/Kconfig | |
719 | ||
cd6b0762 PP |
720 | menu "Instrumentation Support" |
721 | depends on EXPERIMENTAL | |
722 | ||
1da177e4 LT |
723 | source "arch/x86_64/oprofile/Kconfig" |
724 | ||
cd6b0762 PP |
725 | config KPROBES |
726 | bool "Kprobes (EXPERIMENTAL)" | |
3a872d89 | 727 | depends on KALLSYMS && EXPERIMENTAL && MODULES |
cd6b0762 PP |
728 | help |
729 | Kprobes allows you to trap at almost any kernel address and | |
730 | execute a callback function. register_kprobe() establishes | |
731 | a probepoint and specifies the callback. Kprobes is useful | |
732 | for kernel debugging, non-intrusive instrumentation and testing. | |
733 | If in doubt, say "N". | |
734 | endmenu | |
735 | ||
1da177e4 LT |
736 | source "arch/x86_64/Kconfig.debug" |
737 | ||
738 | source "security/Kconfig" | |
739 | ||
740 | source "crypto/Kconfig" | |
741 | ||
742 | source "lib/Kconfig" |