Kconfig 12 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 MMU
  23. bool
  24. default y
  25. config ISA
  26. bool
  27. config SBUS
  28. bool
  29. config RWSEM_GENERIC_SPINLOCK
  30. bool
  31. default y
  32. config RWSEM_XCHGADD_ALGORITHM
  33. bool
  34. config GENERIC_CALIBRATE_DELAY
  35. bool
  36. default y
  37. config X86_CMPXCHG
  38. bool
  39. default y
  40. config EARLY_PRINTK
  41. bool
  42. default y
  43. config GENERIC_ISA_DMA
  44. bool
  45. default y
  46. config GENERIC_IOMAP
  47. bool
  48. default y
  49. source "init/Kconfig"
  50. menu "Processor type and features"
  51. choice
  52. prompt "Processor family"
  53. default MK8
  54. config MK8
  55. bool "AMD-Opteron/Athlon64"
  56. help
  57. Optimize for AMD Opteron/Athlon64/Hammer/K8 CPUs.
  58. config MPSC
  59. bool "Intel EM64T"
  60. help
  61. Optimize for Intel Pentium 4 and Xeon CPUs with Intel
  62. Extended Memory 64 Technology(EM64T). For details see
  63. <http://www.intel.com/technology/64bitextensions/>.
  64. config GENERIC_CPU
  65. bool "Generic-x86-64"
  66. help
  67. Generic x86-64 CPU.
  68. endchoice
  69. #
  70. # Define implied options from the CPU selection here
  71. #
  72. config X86_L1_CACHE_BYTES
  73. int
  74. default "128" if GENERIC_CPU || MPSC
  75. default "64" if MK8
  76. config X86_L1_CACHE_SHIFT
  77. int
  78. default "7" if GENERIC_CPU || MPSC
  79. default "6" if MK8
  80. config X86_TSC
  81. bool
  82. default y
  83. config X86_GOOD_APIC
  84. bool
  85. default y
  86. config MICROCODE
  87. tristate "/dev/cpu/microcode - Intel CPU microcode support"
  88. ---help---
  89. If you say Y here the 'File systems' section, you will be
  90. able to update the microcode on Intel processors. You will
  91. obviously need the actual microcode binary data itself which is
  92. not shipped with the Linux kernel.
  93. For latest news and information on obtaining all the required
  94. ingredients for this driver, check:
  95. <http://www.urbanmyth.org/microcode/>.
  96. To compile this driver as a module, choose M here: the
  97. module will be called microcode.
  98. If you use modprobe or kmod you may also want to add the line
  99. 'alias char-major-10-184 microcode' to your /etc/modules.conf file.
  100. config X86_MSR
  101. tristate "/dev/cpu/*/msr - Model-specific register support"
  102. help
  103. This device gives privileged processes access to the x86
  104. Model-Specific Registers (MSRs). It is a character device with
  105. major 202 and minors 0 to 31 for /dev/cpu/0/msr to /dev/cpu/31/msr.
  106. MSR accesses are directed to a specific CPU on multi-processor
  107. systems.
  108. config X86_CPUID
  109. tristate "/dev/cpu/*/cpuid - CPU information support"
  110. help
  111. This device gives processes access to the x86 CPUID instruction to
  112. be executed on a specific processor. It is a character device
  113. with major 203 and minors 0 to 31 for /dev/cpu/0/cpuid to
  114. /dev/cpu/31/cpuid.
  115. # disable it for opteron optimized builds because it pulls in ACPI_BOOT
  116. config X86_HT
  117. bool
  118. depends on SMP && !MK8
  119. default y
  120. config MATH_EMULATION
  121. bool
  122. config MCA
  123. bool
  124. config EISA
  125. bool
  126. config X86_IO_APIC
  127. bool
  128. default y
  129. config X86_LOCAL_APIC
  130. bool
  131. default y
  132. config MTRR
  133. bool "MTRR (Memory Type Range Register) support"
  134. ---help---
  135. On Intel P6 family processors (Pentium Pro, Pentium II and later)
  136. the Memory Type Range Registers (MTRRs) may be used to control
  137. processor access to memory ranges. This is most useful if you have
  138. a video (VGA) card on a PCI or AGP bus. Enabling write-combining
  139. allows bus write transfers to be combined into a larger transfer
  140. before bursting over the PCI/AGP bus. This can increase performance
  141. of image write operations 2.5 times or more. Saying Y here creates a
  142. /proc/mtrr file which may be used to manipulate your processor's
  143. MTRRs. Typically the X server should use this.
  144. This code has a reasonably generic interface so that similar
  145. control registers on other processors can be easily supported
  146. as well.
  147. Saying Y here also fixes a problem with buggy SMP BIOSes which only
  148. set the MTRRs for the boot CPU and not for the secondary CPUs. This
  149. can lead to all sorts of problems, so it's good to say Y here.
  150. Just say Y here, all x86-64 machines support MTRRs.
  151. See <file:Documentation/mtrr.txt> for more information.
  152. config SMP
  153. bool "Symmetric multi-processing support"
  154. ---help---
  155. This enables support for systems with more than one CPU. If you have
  156. a system with only one CPU, like most personal computers, say N. If
  157. you have a system with more than one CPU, say Y.
  158. If you say N here, the kernel will run on single and multiprocessor
  159. machines, but will use only one CPU of a multiprocessor machine. If
  160. you say Y here, the kernel will run on many, but not all,
  161. singleprocessor machines. On a singleprocessor machine, the kernel
  162. will run faster if you say N here.
  163. If you don't know what to do here, say N.
  164. config PREEMPT
  165. bool "Preemptible Kernel"
  166. ---help---
  167. This option reduces the latency of the kernel when reacting to
  168. real-time or interactive events by allowing a low priority process to
  169. be preempted even if it is in kernel mode executing a system call.
  170. This allows applications to run more reliably even when the system is
  171. under load. On contrary it may also break your drivers and add
  172. priority inheritance problems to your system. Don't select it if
  173. you rely on a stable system or have slightly obscure hardware.
  174. It's also not very well tested on x86-64 currently.
  175. You have been warned.
  176. Say Y here if you are feeling brave and building a kernel for a
  177. desktop, embedded or real-time system. Say N if you are unsure.
  178. config PREEMPT_BKL
  179. bool "Preempt The Big Kernel Lock"
  180. depends on PREEMPT
  181. default y
  182. help
  183. This option reduces the latency of the kernel by making the
  184. big kernel lock preemptible.
  185. Say Y here if you are building a kernel for a desktop system.
  186. Say N if you are unsure.
  187. config SCHED_SMT
  188. bool "SMT (Hyperthreading) scheduler support"
  189. depends on SMP
  190. default n
  191. help
  192. SMT scheduler support improves the CPU scheduler's decision making
  193. when dealing with Intel Pentium 4 chips with HyperThreading at a
  194. cost of slightly increased overhead in some places. If unsure say
  195. N here.
  196. config K8_NUMA
  197. bool "K8 NUMA support"
  198. select NUMA
  199. depends on SMP
  200. help
  201. Enable NUMA (Non Unified Memory Architecture) support for
  202. AMD Opteron Multiprocessor systems. The kernel will try to allocate
  203. memory used by a CPU on the local memory controller of the CPU
  204. and add some more NUMA awareness to the kernel.
  205. This code is recommended on all multiprocessor Opteron systems
  206. and normally doesn't hurt on others.
  207. config NUMA_EMU
  208. bool "NUMA emulation support"
  209. select NUMA
  210. depends on SMP
  211. help
  212. Enable NUMA emulation. A flat machine will be split
  213. into virtual nodes when booted with "numa=fake=N", where N is the
  214. number of nodes. This is only useful for debugging.
  215. config DISCONTIGMEM
  216. bool
  217. depends on NUMA
  218. default y
  219. config NUMA
  220. bool
  221. default n
  222. config HAVE_DEC_LOCK
  223. bool
  224. depends on SMP
  225. default y
  226. config NR_CPUS
  227. int "Maximum number of CPUs (2-256)"
  228. range 2 256
  229. depends on SMP
  230. default "8"
  231. help
  232. This allows you to specify the maximum number of CPUs which this
  233. kernel will support. Current maximum is 256 CPUs due to
  234. APIC addressing limits. Less depending on the hardware.
  235. This is purely to save memory - each supported CPU requires
  236. memory in the static kernel configuration.
  237. config HPET_TIMER
  238. bool
  239. default y
  240. help
  241. Use the IA-PC HPET (High Precision Event Timer) to manage
  242. time in preference to the PIT and RTC, if a HPET is
  243. present. The HPET provides a stable time base on SMP
  244. systems, unlike the TSC, but it is more expensive to access,
  245. as it is off-chip. You can find the HPET spec at
  246. <http://www.intel.com/labs/platcomp/hpet/hpetspec.htm>.
  247. config HPET_EMULATE_RTC
  248. bool "Provide RTC interrupt"
  249. depends on HPET_TIMER && RTC=y
  250. config GART_IOMMU
  251. bool "IOMMU support"
  252. depends on PCI
  253. help
  254. Support the K8 IOMMU. Needed to run systems with more than 4GB of memory
  255. properly with 32-bit PCI devices that do not support DAC (Double Address
  256. Cycle). The IOMMU can be turned off at runtime with the iommu=off parameter.
  257. Normally the kernel will take the right choice by itself.
  258. If unsure, say Y.
  259. # need this always enabled with GART_IOMMU for the VIA workaround
  260. config SWIOTLB
  261. bool
  262. depends on GART_IOMMU
  263. default y
  264. config DUMMY_IOMMU
  265. bool
  266. depends on !GART_IOMMU && !SWIOTLB
  267. default y
  268. help
  269. Don't use IOMMU code. This will cause problems when you have more than 4GB
  270. of memory and any 32-bit devices. Don't turn on unless you know what you
  271. are doing.
  272. config X86_MCE
  273. bool "Machine check support" if EMBEDDED
  274. default y
  275. help
  276. Include a machine check error handler to report hardware errors.
  277. This version will require the mcelog utility to decode some
  278. machine check error logs. See
  279. ftp://ftp.x86-64.org/pub/linux/tools/mcelog
  280. config X86_MCE_INTEL
  281. bool "Intel MCE features"
  282. depends on X86_MCE && X86_LOCAL_APIC
  283. default y
  284. help
  285. Additional support for intel specific MCE features such as
  286. the thermal monitor.
  287. config SECCOMP
  288. bool "Enable seccomp to safely compute untrusted bytecode"
  289. depends on PROC_FS
  290. default y
  291. help
  292. This kernel feature is useful for number crunching applications
  293. that may need to compute untrusted bytecode during their
  294. execution. By using pipes or other transports made available to
  295. the process as file descriptors supporting the read/write
  296. syscalls, it's possible to isolate those applications in
  297. their own address space using seccomp. Once seccomp is
  298. enabled via /proc/<pid>/seccomp, it cannot be disabled
  299. and the task is only allowed to execute a few safe syscalls
  300. defined by each seccomp mode.
  301. If unsure, say Y. Only embedded should say N here.
  302. endmenu
  303. #
  304. # Use the generic interrupt handling code in kernel/irq/:
  305. #
  306. config GENERIC_HARDIRQS
  307. bool
  308. default y
  309. config GENERIC_IRQ_PROBE
  310. bool
  311. default y
  312. # we have no ISA slots, but we do have ISA-style DMA.
  313. config ISA_DMA_API
  314. bool
  315. default y
  316. menu "Power management options"
  317. source kernel/power/Kconfig
  318. source "drivers/acpi/Kconfig"
  319. source "arch/x86_64/kernel/cpufreq/Kconfig"
  320. endmenu
  321. menu "Bus options (PCI etc.)"
  322. config PCI
  323. bool "PCI support"
  324. # x86-64 doesn't support PCI BIOS access from long mode so always go direct.
  325. config PCI_DIRECT
  326. bool
  327. depends on PCI
  328. default y
  329. config PCI_MMCONFIG
  330. bool "Support mmconfig PCI config space access"
  331. depends on PCI
  332. select ACPI_BOOT
  333. config UNORDERED_IO
  334. bool "Unordered IO mapping access"
  335. depends on EXPERIMENTAL
  336. help
  337. Use unordered stores to access IO memory mappings in device drivers.
  338. Still very experimental. When a driver works on IA64/ppc64/pa-risc it should
  339. work with this option, but it makes the drivers behave differently
  340. from i386. Requires that the driver writer used memory barriers
  341. properly.
  342. source "drivers/pci/pcie/Kconfig"
  343. source "drivers/pci/Kconfig"
  344. source "drivers/pcmcia/Kconfig"
  345. source "drivers/pci/hotplug/Kconfig"
  346. endmenu
  347. menu "Executable file formats / Emulations"
  348. source "fs/Kconfig.binfmt"
  349. config IA32_EMULATION
  350. bool "IA32 Emulation"
  351. help
  352. Include code to run 32-bit programs under a 64-bit kernel. You should likely
  353. turn this on, unless you're 100% sure that you don't have any 32-bit programs
  354. left.
  355. config IA32_AOUT
  356. bool "IA32 a.out support"
  357. depends on IA32_EMULATION
  358. help
  359. Support old a.out binaries in the 32bit emulation.
  360. config COMPAT
  361. bool
  362. depends on IA32_EMULATION
  363. default y
  364. config SYSVIPC_COMPAT
  365. bool
  366. depends on COMPAT && SYSVIPC
  367. default y
  368. config UID16
  369. bool
  370. depends on IA32_EMULATION
  371. default y
  372. endmenu
  373. source drivers/Kconfig
  374. source "drivers/firmware/Kconfig"
  375. source fs/Kconfig
  376. source "arch/x86_64/oprofile/Kconfig"
  377. source "arch/x86_64/Kconfig.debug"
  378. source "security/Kconfig"
  379. source "crypto/Kconfig"
  380. source "lib/Kconfig"