Kconfig 15 KB

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  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. mainmenu "Linux Kernel Configuration"
  10. config X86_64
  11. bool
  12. default y
  13. help
  14. Port to the x86-64 architecture. x86-64 is a 64-bit extension to the
  15. classical 32-bit x86 architecture. For details see
  16. <http://www.x86-64.org/>.
  17. config 64BIT
  18. def_bool y
  19. config X86
  20. bool
  21. default y
  22. config SEMAPHORE_SLEEPERS
  23. bool
  24. default y
  25. config MMU
  26. bool
  27. default y
  28. config ISA
  29. bool
  30. config SBUS
  31. bool
  32. config RWSEM_GENERIC_SPINLOCK
  33. bool
  34. default y
  35. config RWSEM_XCHGADD_ALGORITHM
  36. bool
  37. config GENERIC_CALIBRATE_DELAY
  38. bool
  39. default y
  40. config X86_CMPXCHG
  41. bool
  42. default y
  43. config EARLY_PRINTK
  44. bool
  45. default y
  46. config GENERIC_ISA_DMA
  47. bool
  48. default y
  49. config GENERIC_IOMAP
  50. bool
  51. default y
  52. config ARCH_MAY_HAVE_PC_FDC
  53. bool
  54. default y
  55. config DMI
  56. bool
  57. default y
  58. source "init/Kconfig"
  59. menu "Processor type and features"
  60. choice
  61. prompt "Processor family"
  62. default MK8
  63. config MK8
  64. bool "AMD-Opteron/Athlon64"
  65. help
  66. Optimize for AMD Opteron/Athlon64/Hammer/K8 CPUs.
  67. config MPSC
  68. bool "Intel EM64T"
  69. help
  70. Optimize for Intel Pentium 4 and Xeon CPUs with Intel
  71. Extended Memory 64 Technology(EM64T). For details see
  72. <http://www.intel.com/technology/64bitextensions/>.
  73. config GENERIC_CPU
  74. bool "Generic-x86-64"
  75. help
  76. Generic x86-64 CPU.
  77. endchoice
  78. #
  79. # Define implied options from the CPU selection here
  80. #
  81. config X86_L1_CACHE_BYTES
  82. int
  83. default "128" if GENERIC_CPU || MPSC
  84. default "64" if MK8
  85. config X86_L1_CACHE_SHIFT
  86. int
  87. default "7" if GENERIC_CPU || MPSC
  88. default "6" if MK8
  89. config X86_TSC
  90. bool
  91. default y
  92. config X86_GOOD_APIC
  93. bool
  94. default y
  95. config MICROCODE
  96. tristate "/dev/cpu/microcode - Intel CPU microcode support"
  97. ---help---
  98. If you say Y here the 'File systems' section, you will be
  99. able to update the microcode on Intel processors. You will
  100. obviously need the actual microcode binary data itself which is
  101. not shipped with the Linux kernel.
  102. For latest news and information on obtaining all the required
  103. ingredients for this driver, check:
  104. <http://www.urbanmyth.org/microcode/>.
  105. To compile this driver as a module, choose M here: the
  106. module will be called microcode.
  107. If you use modprobe or kmod you may also want to add the line
  108. 'alias char-major-10-184 microcode' to your /etc/modules.conf file.
  109. config X86_MSR
  110. tristate "/dev/cpu/*/msr - Model-specific register support"
  111. help
  112. This device gives privileged processes access to the x86
  113. Model-Specific Registers (MSRs). It is a character device with
  114. major 202 and minors 0 to 31 for /dev/cpu/0/msr to /dev/cpu/31/msr.
  115. MSR accesses are directed to a specific CPU on multi-processor
  116. systems.
  117. config X86_CPUID
  118. tristate "/dev/cpu/*/cpuid - CPU information support"
  119. help
  120. This device gives processes access to the x86 CPUID instruction to
  121. be executed on a specific processor. It is a character device
  122. with major 203 and minors 0 to 31 for /dev/cpu/0/cpuid to
  123. /dev/cpu/31/cpuid.
  124. config X86_HT
  125. bool
  126. depends on SMP && !MK8
  127. default y
  128. config MATH_EMULATION
  129. bool
  130. config MCA
  131. bool
  132. config EISA
  133. bool
  134. config X86_IO_APIC
  135. bool
  136. default y
  137. config X86_LOCAL_APIC
  138. bool
  139. default y
  140. config MTRR
  141. bool "MTRR (Memory Type Range Register) support"
  142. ---help---
  143. On Intel P6 family processors (Pentium Pro, Pentium II and later)
  144. the Memory Type Range Registers (MTRRs) may be used to control
  145. processor access to memory ranges. This is most useful if you have
  146. a video (VGA) card on a PCI or AGP bus. Enabling write-combining
  147. allows bus write transfers to be combined into a larger transfer
  148. before bursting over the PCI/AGP bus. This can increase performance
  149. of image write operations 2.5 times or more. Saying Y here creates a
  150. /proc/mtrr file which may be used to manipulate your processor's
  151. MTRRs. Typically the X server should use this.
  152. This code has a reasonably generic interface so that similar
  153. control registers on other processors can be easily supported
  154. as well.
  155. Saying Y here also fixes a problem with buggy SMP BIOSes which only
  156. set the MTRRs for the boot CPU and not for the secondary CPUs. This
  157. can lead to all sorts of problems, so it's good to say Y here.
  158. Just say Y here, all x86-64 machines support MTRRs.
  159. See <file:Documentation/mtrr.txt> for more information.
  160. config SMP
  161. bool "Symmetric multi-processing support"
  162. ---help---
  163. This enables support for systems with more than one CPU. If you have
  164. a system with only one CPU, like most personal computers, say N. If
  165. you have a system with more than one CPU, say Y.
  166. If you say N here, the kernel will run on single and multiprocessor
  167. machines, but will use only one CPU of a multiprocessor machine. If
  168. you say Y here, the kernel will run on many, but not all,
  169. singleprocessor machines. On a singleprocessor machine, the kernel
  170. will run faster if you say N here.
  171. If you don't know what to do here, say N.
  172. config SCHED_SMT
  173. bool "SMT (Hyperthreading) scheduler support"
  174. depends on SMP
  175. default n
  176. help
  177. SMT scheduler support improves the CPU scheduler's decision making
  178. when dealing with Intel Pentium 4 chips with HyperThreading at a
  179. cost of slightly increased overhead in some places. If unsure say
  180. N here.
  181. source "kernel/Kconfig.preempt"
  182. config NUMA
  183. bool "Non Uniform Memory Access (NUMA) Support"
  184. depends on SMP
  185. help
  186. Enable NUMA (Non Uniform Memory Access) support. The kernel
  187. will try to allocate memory used by a CPU on the local memory
  188. controller of the CPU and add some more NUMA awareness to the kernel.
  189. This code is recommended on all multiprocessor Opteron systems.
  190. If the system is EM64T, you should say N unless your system is EM64T
  191. NUMA.
  192. config K8_NUMA
  193. bool "Old style AMD Opteron NUMA detection"
  194. depends on NUMA
  195. default y
  196. help
  197. Enable K8 NUMA node topology detection. You should say Y here if
  198. you have a multi processor AMD K8 system. This uses an old
  199. method to read the NUMA configurtion directly from the builtin
  200. Northbridge of Opteron. It is recommended to use X86_64_ACPI_NUMA
  201. instead, which also takes priority if both are compiled in.
  202. # Dummy CONFIG option to select ACPI_NUMA from drivers/acpi/Kconfig.
  203. config X86_64_ACPI_NUMA
  204. bool "ACPI NUMA detection"
  205. depends on NUMA
  206. select ACPI
  207. select ACPI_NUMA
  208. default y
  209. help
  210. Enable ACPI SRAT based node topology detection.
  211. config NUMA_EMU
  212. bool "NUMA emulation"
  213. depends on NUMA
  214. help
  215. Enable NUMA emulation. A flat machine will be split
  216. into virtual nodes when booted with "numa=fake=N", where N is the
  217. number of nodes. This is only useful for debugging.
  218. config ARCH_DISCONTIGMEM_ENABLE
  219. bool
  220. depends on NUMA
  221. default y
  222. config ARCH_DISCONTIGMEM_ENABLE
  223. def_bool y
  224. depends on NUMA
  225. config ARCH_DISCONTIGMEM_DEFAULT
  226. def_bool y
  227. depends on NUMA
  228. config ARCH_SPARSEMEM_ENABLE
  229. def_bool y
  230. depends on NUMA
  231. config ARCH_FLATMEM_ENABLE
  232. def_bool y
  233. depends on !NUMA
  234. source "mm/Kconfig"
  235. config HAVE_ARCH_EARLY_PFN_TO_NID
  236. def_bool y
  237. config NR_CPUS
  238. int "Maximum number of CPUs (2-256)"
  239. range 2 256
  240. depends on SMP
  241. default "8"
  242. help
  243. This allows you to specify the maximum number of CPUs which this
  244. kernel will support. Current maximum is 256 CPUs due to
  245. APIC addressing limits. Less depending on the hardware.
  246. This is purely to save memory - each supported CPU requires
  247. memory in the static kernel configuration.
  248. config HOTPLUG_CPU
  249. bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
  250. depends on SMP && HOTPLUG && EXPERIMENTAL
  251. help
  252. Say Y here to experiment with turning CPUs off and on. CPUs
  253. can be controlled through /sys/devices/system/cpu/cpu#.
  254. Say N if you want to disable CPU hotplug.
  255. config HPET_TIMER
  256. bool
  257. default y
  258. help
  259. Use the IA-PC HPET (High Precision Event Timer) to manage
  260. time in preference to the PIT and RTC, if a HPET is
  261. present. The HPET provides a stable time base on SMP
  262. systems, unlike the TSC, but it is more expensive to access,
  263. as it is off-chip. You can find the HPET spec at
  264. <http://www.intel.com/hardwaredesign/hpetspec.htm>.
  265. config X86_PM_TIMER
  266. bool "PM timer"
  267. depends on ACPI
  268. default y
  269. help
  270. Support the ACPI PM timer for time keeping. This is slow,
  271. but is useful on some chipsets without HPET on systems with more
  272. than one CPU. On a single processor or single socket multi core
  273. system it is normally not required.
  274. When the PM timer is active 64bit vsyscalls are disabled
  275. and should not be enabled (/proc/sys/kernel/vsyscall64 should
  276. not be changed).
  277. The kernel selects the PM timer only as a last resort, so it is
  278. useful to enable just in case.
  279. config HPET_EMULATE_RTC
  280. bool "Provide RTC interrupt"
  281. depends on HPET_TIMER && RTC=y
  282. config GART_IOMMU
  283. bool "K8 GART IOMMU support"
  284. default y
  285. select SWIOTLB
  286. depends on PCI
  287. help
  288. Support the IOMMU. Needed to run systems with more than 3GB of memory
  289. properly with 32-bit PCI devices that do not support DAC (Double Address
  290. Cycle). The IOMMU can be turned off at runtime with the iommu=off parameter.
  291. Normally the kernel will take the right choice by itself.
  292. This option includes a driver for the AMD Opteron/Athlon64 northbridge IOMMU
  293. and a software emulation used on other systems.
  294. If unsure, say Y.
  295. # need this always enabled with GART_IOMMU for the VIA workaround
  296. config SWIOTLB
  297. bool
  298. default y
  299. depends on GART_IOMMU
  300. config X86_MCE
  301. bool "Machine check support" if EMBEDDED
  302. default y
  303. help
  304. Include a machine check error handler to report hardware errors.
  305. This version will require the mcelog utility to decode some
  306. machine check error logs. See
  307. ftp://ftp.x86-64.org/pub/linux/tools/mcelog
  308. config X86_MCE_INTEL
  309. bool "Intel MCE features"
  310. depends on X86_MCE && X86_LOCAL_APIC
  311. default y
  312. help
  313. Additional support for intel specific MCE features such as
  314. the thermal monitor.
  315. config X86_MCE_AMD
  316. bool "AMD MCE features"
  317. depends on X86_MCE && X86_LOCAL_APIC
  318. default y
  319. help
  320. Additional support for AMD specific MCE features such as
  321. the DRAM Error Threshold.
  322. config KEXEC
  323. bool "kexec system call (EXPERIMENTAL)"
  324. depends on EXPERIMENTAL
  325. help
  326. kexec is a system call that implements the ability to shutdown your
  327. current kernel, and to start another kernel. It is like a reboot
  328. but it is indepedent of the system firmware. And like a reboot
  329. you can start any kernel with it, not just Linux.
  330. The name comes from the similiarity to the exec system call.
  331. It is an ongoing process to be certain the hardware in a machine
  332. is properly shutdown, so do not be surprised if this code does not
  333. initially work for you. It may help to enable device hotplugging
  334. support. As of this writing the exact hardware interface is
  335. strongly in flux, so no good recommendation can be made.
  336. config CRASH_DUMP
  337. bool "kernel crash dumps (EXPERIMENTAL)"
  338. depends on EXPERIMENTAL
  339. help
  340. Generate crash dump after being started by kexec.
  341. config PHYSICAL_START
  342. hex "Physical address where the kernel is loaded" if (EMBEDDED || CRASH_DUMP)
  343. default "0x1000000" if CRASH_DUMP
  344. default "0x100000"
  345. help
  346. This gives the physical address where the kernel is loaded. Normally
  347. for regular kernels this value is 0x100000 (1MB). But in the case
  348. of kexec on panic the fail safe kernel needs to run at a different
  349. address than the panic-ed kernel. This option is used to set the load
  350. address for kernels used to capture crash dump on being kexec'ed
  351. after panic. The default value for crash dump kernels is
  352. 0x1000000 (16MB). This can also be set based on the "X" value as
  353. specified in the "crashkernel=YM@XM" command line boot parameter
  354. passed to the panic-ed kernel. Typically this parameter is set as
  355. crashkernel=64M@16M. Please take a look at
  356. Documentation/kdump/kdump.txt for more details about crash dumps.
  357. Don't change this unless you know what you are doing.
  358. config SECCOMP
  359. bool "Enable seccomp to safely compute untrusted bytecode"
  360. depends on PROC_FS
  361. default y
  362. help
  363. This kernel feature is useful for number crunching applications
  364. that may need to compute untrusted bytecode during their
  365. execution. By using pipes or other transports made available to
  366. the process as file descriptors supporting the read/write
  367. syscalls, it's possible to isolate those applications in
  368. their own address space using seccomp. Once seccomp is
  369. enabled via /proc/<pid>/seccomp, it cannot be disabled
  370. and the task is only allowed to execute a few safe syscalls
  371. defined by each seccomp mode.
  372. If unsure, say Y. Only embedded should say N here.
  373. source kernel/Kconfig.hz
  374. endmenu
  375. #
  376. # Use the generic interrupt handling code in kernel/irq/:
  377. #
  378. config GENERIC_HARDIRQS
  379. bool
  380. default y
  381. config GENERIC_IRQ_PROBE
  382. bool
  383. default y
  384. # we have no ISA slots, but we do have ISA-style DMA.
  385. config ISA_DMA_API
  386. bool
  387. default y
  388. config GENERIC_PENDING_IRQ
  389. bool
  390. depends on GENERIC_HARDIRQS && SMP
  391. default y
  392. menu "Power management options"
  393. source kernel/power/Kconfig
  394. source "drivers/acpi/Kconfig"
  395. source "arch/x86_64/kernel/cpufreq/Kconfig"
  396. endmenu
  397. menu "Bus options (PCI etc.)"
  398. config PCI
  399. bool "PCI support"
  400. # x86-64 doesn't support PCI BIOS access from long mode so always go direct.
  401. config PCI_DIRECT
  402. bool
  403. depends on PCI
  404. default y
  405. config PCI_MMCONFIG
  406. bool "Support mmconfig PCI config space access"
  407. depends on PCI && ACPI
  408. config UNORDERED_IO
  409. bool "Unordered IO mapping access"
  410. depends on EXPERIMENTAL
  411. help
  412. Use unordered stores to access IO memory mappings in device drivers.
  413. Still very experimental. When a driver works on IA64/ppc64/pa-risc it should
  414. work with this option, but it makes the drivers behave differently
  415. from i386. Requires that the driver writer used memory barriers
  416. properly.
  417. source "drivers/pci/pcie/Kconfig"
  418. source "drivers/pci/Kconfig"
  419. source "drivers/pcmcia/Kconfig"
  420. source "drivers/pci/hotplug/Kconfig"
  421. endmenu
  422. menu "Executable file formats / Emulations"
  423. source "fs/Kconfig.binfmt"
  424. config IA32_EMULATION
  425. bool "IA32 Emulation"
  426. help
  427. Include code to run 32-bit programs under a 64-bit kernel. You should likely
  428. turn this on, unless you're 100% sure that you don't have any 32-bit programs
  429. left.
  430. config IA32_AOUT
  431. tristate "IA32 a.out support"
  432. depends on IA32_EMULATION
  433. help
  434. Support old a.out binaries in the 32bit emulation.
  435. config COMPAT
  436. bool
  437. depends on IA32_EMULATION
  438. default y
  439. config SYSVIPC_COMPAT
  440. bool
  441. depends on COMPAT && SYSVIPC
  442. default y
  443. endmenu
  444. source "net/Kconfig"
  445. source drivers/Kconfig
  446. source "drivers/firmware/Kconfig"
  447. source fs/Kconfig
  448. menu "Instrumentation Support"
  449. depends on EXPERIMENTAL
  450. source "arch/x86_64/oprofile/Kconfig"
  451. config KPROBES
  452. bool "Kprobes (EXPERIMENTAL)"
  453. help
  454. Kprobes allows you to trap at almost any kernel address and
  455. execute a callback function. register_kprobe() establishes
  456. a probepoint and specifies the callback. Kprobes is useful
  457. for kernel debugging, non-intrusive instrumentation and testing.
  458. If in doubt, say "N".
  459. endmenu
  460. source "arch/x86_64/Kconfig.debug"
  461. source "security/Kconfig"
  462. source "crypto/Kconfig"
  463. source "lib/Kconfig"