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 "Subarchitecture Type"
  62. default X86_PC
  63. config X86_PC
  64. bool "PC-compatible"
  65. help
  66. Choose this option if your computer is a standard PC or compatible.
  67. config X86_VSMP
  68. bool "Support for ScaleMP vSMP"
  69. help
  70. Support for ScaleMP vSMP systems. Say 'Y' here if this kernel is
  71. supposed to run on these EM64T-based machines. Only choose this option
  72. if you have one of these machines.
  73. endchoice
  74. choice
  75. prompt "Processor family"
  76. default MK8
  77. config MK8
  78. bool "AMD-Opteron/Athlon64"
  79. help
  80. Optimize for AMD Opteron/Athlon64/Hammer/K8 CPUs.
  81. config MPSC
  82. bool "Intel EM64T"
  83. help
  84. Optimize for Intel Pentium 4 and Xeon CPUs with Intel
  85. Extended Memory 64 Technology(EM64T). For details see
  86. <http://www.intel.com/technology/64bitextensions/>.
  87. config GENERIC_CPU
  88. bool "Generic-x86-64"
  89. help
  90. Generic x86-64 CPU.
  91. endchoice
  92. #
  93. # Define implied options from the CPU selection here
  94. #
  95. config X86_L1_CACHE_BYTES
  96. int
  97. default "128" if GENERIC_CPU || MPSC
  98. default "64" if MK8
  99. config X86_L1_CACHE_SHIFT
  100. int
  101. default "7" if GENERIC_CPU || MPSC
  102. default "6" if MK8
  103. config X86_TSC
  104. bool
  105. default y
  106. config X86_GOOD_APIC
  107. bool
  108. default y
  109. config MICROCODE
  110. tristate "/dev/cpu/microcode - Intel CPU microcode support"
  111. ---help---
  112. If you say Y here the 'File systems' section, you will be
  113. able to update the microcode on Intel processors. You will
  114. obviously need the actual microcode binary data itself which is
  115. not shipped with the Linux kernel.
  116. For latest news and information on obtaining all the required
  117. ingredients for this driver, check:
  118. <http://www.urbanmyth.org/microcode/>.
  119. To compile this driver as a module, choose M here: the
  120. module will be called microcode.
  121. If you use modprobe or kmod you may also want to add the line
  122. 'alias char-major-10-184 microcode' to your /etc/modules.conf file.
  123. config X86_MSR
  124. tristate "/dev/cpu/*/msr - Model-specific register support"
  125. help
  126. This device gives privileged processes access to the x86
  127. Model-Specific Registers (MSRs). It is a character device with
  128. major 202 and minors 0 to 31 for /dev/cpu/0/msr to /dev/cpu/31/msr.
  129. MSR accesses are directed to a specific CPU on multi-processor
  130. systems.
  131. config X86_CPUID
  132. tristate "/dev/cpu/*/cpuid - CPU information support"
  133. help
  134. This device gives processes access to the x86 CPUID instruction to
  135. be executed on a specific processor. It is a character device
  136. with major 203 and minors 0 to 31 for /dev/cpu/0/cpuid to
  137. /dev/cpu/31/cpuid.
  138. config X86_HT
  139. bool
  140. depends on SMP && !MK8
  141. default y
  142. config MATH_EMULATION
  143. bool
  144. config MCA
  145. bool
  146. config EISA
  147. bool
  148. config X86_IO_APIC
  149. bool
  150. default y
  151. config X86_LOCAL_APIC
  152. bool
  153. default y
  154. config MTRR
  155. bool "MTRR (Memory Type Range Register) support"
  156. ---help---
  157. On Intel P6 family processors (Pentium Pro, Pentium II and later)
  158. the Memory Type Range Registers (MTRRs) may be used to control
  159. processor access to memory ranges. This is most useful if you have
  160. a video (VGA) card on a PCI or AGP bus. Enabling write-combining
  161. allows bus write transfers to be combined into a larger transfer
  162. before bursting over the PCI/AGP bus. This can increase performance
  163. of image write operations 2.5 times or more. Saying Y here creates a
  164. /proc/mtrr file which may be used to manipulate your processor's
  165. MTRRs. Typically the X server should use this.
  166. This code has a reasonably generic interface so that similar
  167. control registers on other processors can be easily supported
  168. as well.
  169. Saying Y here also fixes a problem with buggy SMP BIOSes which only
  170. set the MTRRs for the boot CPU and not for the secondary CPUs. This
  171. can lead to all sorts of problems, so it's good to say Y here.
  172. Just say Y here, all x86-64 machines support MTRRs.
  173. See <file:Documentation/mtrr.txt> for more information.
  174. config SMP
  175. bool "Symmetric multi-processing support"
  176. ---help---
  177. This enables support for systems with more than one CPU. If you have
  178. a system with only one CPU, like most personal computers, say N. If
  179. you have a system with more than one CPU, say Y.
  180. If you say N here, the kernel will run on single and multiprocessor
  181. machines, but will use only one CPU of a multiprocessor machine. If
  182. you say Y here, the kernel will run on many, but not all,
  183. singleprocessor machines. On a singleprocessor machine, the kernel
  184. will run faster if you say N here.
  185. If you don't know what to do here, say N.
  186. config SCHED_SMT
  187. bool "SMT (Hyperthreading) scheduler support"
  188. depends on SMP
  189. default n
  190. help
  191. SMT scheduler support improves the CPU scheduler's decision making
  192. when dealing with Intel Pentium 4 chips with HyperThreading at a
  193. cost of slightly increased overhead in some places. If unsure say
  194. N here.
  195. source "kernel/Kconfig.preempt"
  196. config NUMA
  197. bool "Non Uniform Memory Access (NUMA) Support"
  198. depends on SMP
  199. help
  200. Enable NUMA (Non Uniform Memory Access) support. The kernel
  201. will try to allocate memory used by a CPU on the local memory
  202. controller of the CPU and add some more NUMA awareness to the kernel.
  203. This code is recommended on all multiprocessor Opteron systems.
  204. If the system is EM64T, you should say N unless your system is EM64T
  205. NUMA.
  206. config K8_NUMA
  207. bool "Old style AMD Opteron NUMA detection"
  208. depends on NUMA
  209. default y
  210. help
  211. Enable K8 NUMA node topology detection. You should say Y here if
  212. you have a multi processor AMD K8 system. This uses an old
  213. method to read the NUMA configurtion directly from the builtin
  214. Northbridge of Opteron. It is recommended to use X86_64_ACPI_NUMA
  215. instead, which also takes priority if both are compiled in.
  216. # Dummy CONFIG option to select ACPI_NUMA from drivers/acpi/Kconfig.
  217. config X86_64_ACPI_NUMA
  218. bool "ACPI NUMA detection"
  219. depends on NUMA
  220. select ACPI
  221. select ACPI_NUMA
  222. default y
  223. help
  224. Enable ACPI SRAT based node topology detection.
  225. config NUMA_EMU
  226. bool "NUMA emulation"
  227. depends on NUMA
  228. help
  229. Enable NUMA emulation. A flat machine will be split
  230. into virtual nodes when booted with "numa=fake=N", where N is the
  231. number of nodes. This is only useful for debugging.
  232. config ARCH_DISCONTIGMEM_ENABLE
  233. bool
  234. depends on NUMA
  235. default y
  236. config ARCH_DISCONTIGMEM_ENABLE
  237. def_bool y
  238. depends on NUMA
  239. config ARCH_DISCONTIGMEM_DEFAULT
  240. def_bool y
  241. depends on NUMA
  242. config ARCH_SPARSEMEM_ENABLE
  243. def_bool y
  244. depends on (NUMA || EXPERIMENTAL)
  245. config ARCH_MEMORY_PROBE
  246. def_bool y
  247. depends on MEMORY_HOTPLUG
  248. config ARCH_FLATMEM_ENABLE
  249. def_bool y
  250. depends on !NUMA
  251. source "mm/Kconfig"
  252. config HAVE_ARCH_EARLY_PFN_TO_NID
  253. def_bool y
  254. depends on NUMA
  255. config NR_CPUS
  256. int "Maximum number of CPUs (2-256)"
  257. range 2 256
  258. depends on SMP
  259. default "8"
  260. help
  261. This allows you to specify the maximum number of CPUs which this
  262. kernel will support. Current maximum is 256 CPUs due to
  263. APIC addressing limits. Less depending on the hardware.
  264. This is purely to save memory - each supported CPU requires
  265. memory in the static kernel configuration.
  266. config HOTPLUG_CPU
  267. bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
  268. depends on SMP && HOTPLUG && EXPERIMENTAL
  269. help
  270. Say Y here to experiment with turning CPUs off and on. CPUs
  271. can be controlled through /sys/devices/system/cpu/cpu#.
  272. Say N if you want to disable CPU hotplug.
  273. config HPET_TIMER
  274. bool
  275. default y
  276. help
  277. Use the IA-PC HPET (High Precision Event Timer) to manage
  278. time in preference to the PIT and RTC, if a HPET is
  279. present. The HPET provides a stable time base on SMP
  280. systems, unlike the TSC, but it is more expensive to access,
  281. as it is off-chip. You can find the HPET spec at
  282. <http://www.intel.com/hardwaredesign/hpetspec.htm>.
  283. config HPET_EMULATE_RTC
  284. bool "Provide RTC interrupt"
  285. depends on HPET_TIMER && RTC=y
  286. config GART_IOMMU
  287. bool "K8 GART IOMMU support"
  288. default y
  289. select SWIOTLB
  290. depends on PCI
  291. help
  292. Support the IOMMU. Needed to run systems with more than 3GB of memory
  293. properly with 32-bit PCI devices that do not support DAC (Double Address
  294. Cycle). The IOMMU can be turned off at runtime with the iommu=off parameter.
  295. Normally the kernel will take the right choice by itself.
  296. This option includes a driver for the AMD Opteron/Athlon64 northbridge IOMMU
  297. and a software emulation used on other systems.
  298. If unsure, say Y.
  299. # need this always enabled with GART_IOMMU for the VIA workaround
  300. config SWIOTLB
  301. bool
  302. default y
  303. depends on GART_IOMMU
  304. config X86_MCE
  305. bool "Machine check support" if EMBEDDED
  306. default y
  307. help
  308. Include a machine check error handler to report hardware errors.
  309. This version will require the mcelog utility to decode some
  310. machine check error logs. See
  311. ftp://ftp.x86-64.org/pub/linux/tools/mcelog
  312. config X86_MCE_INTEL
  313. bool "Intel MCE features"
  314. depends on X86_MCE && X86_LOCAL_APIC
  315. default y
  316. help
  317. Additional support for intel specific MCE features such as
  318. the thermal monitor.
  319. config X86_MCE_AMD
  320. bool "AMD MCE features"
  321. depends on X86_MCE && X86_LOCAL_APIC
  322. default y
  323. help
  324. Additional support for AMD specific MCE features such as
  325. the DRAM Error Threshold.
  326. config KEXEC
  327. bool "kexec system call (EXPERIMENTAL)"
  328. depends on EXPERIMENTAL
  329. help
  330. kexec is a system call that implements the ability to shutdown your
  331. current kernel, and to start another kernel. It is like a reboot
  332. but it is indepedent of the system firmware. And like a reboot
  333. you can start any kernel with it, not just Linux.
  334. The name comes from the similiarity to the exec system call.
  335. It is an ongoing process to be certain the hardware in a machine
  336. is properly shutdown, so do not be surprised if this code does not
  337. initially work for you. It may help to enable device hotplugging
  338. support. As of this writing the exact hardware interface is
  339. strongly in flux, so no good recommendation can be made.
  340. config CRASH_DUMP
  341. bool "kernel crash dumps (EXPERIMENTAL)"
  342. depends on EXPERIMENTAL
  343. help
  344. Generate crash dump after being started by kexec.
  345. config PHYSICAL_START
  346. hex "Physical address where the kernel is loaded" if (EMBEDDED || CRASH_DUMP)
  347. default "0x1000000" if CRASH_DUMP
  348. default "0x100000"
  349. help
  350. This gives the physical address where the kernel is loaded. Normally
  351. for regular kernels this value is 0x100000 (1MB). But in the case
  352. of kexec on panic the fail safe kernel needs to run at a different
  353. address than the panic-ed kernel. This option is used to set the load
  354. address for kernels used to capture crash dump on being kexec'ed
  355. after panic. The default value for crash dump kernels is
  356. 0x1000000 (16MB). This can also be set based on the "X" value as
  357. specified in the "crashkernel=YM@XM" command line boot parameter
  358. passed to the panic-ed kernel. Typically this parameter is set as
  359. crashkernel=64M@16M. Please take a look at
  360. Documentation/kdump/kdump.txt for more details about crash dumps.
  361. Don't change this unless you know what you are doing.
  362. config SECCOMP
  363. bool "Enable seccomp to safely compute untrusted bytecode"
  364. depends on PROC_FS
  365. default y
  366. help
  367. This kernel feature is useful for number crunching applications
  368. that may need to compute untrusted bytecode during their
  369. execution. By using pipes or other transports made available to
  370. the process as file descriptors supporting the read/write
  371. syscalls, it's possible to isolate those applications in
  372. their own address space using seccomp. Once seccomp is
  373. enabled via /proc/<pid>/seccomp, it cannot be disabled
  374. and the task is only allowed to execute a few safe syscalls
  375. defined by each seccomp mode.
  376. If unsure, say Y. Only embedded should say N here.
  377. source kernel/Kconfig.hz
  378. endmenu
  379. #
  380. # Use the generic interrupt handling code in kernel/irq/:
  381. #
  382. config GENERIC_HARDIRQS
  383. bool
  384. default y
  385. config GENERIC_IRQ_PROBE
  386. bool
  387. default y
  388. # we have no ISA slots, but we do have ISA-style DMA.
  389. config ISA_DMA_API
  390. bool
  391. default y
  392. config GENERIC_PENDING_IRQ
  393. bool
  394. depends on GENERIC_HARDIRQS && SMP
  395. default y
  396. menu "Power management options"
  397. source kernel/power/Kconfig
  398. source "drivers/acpi/Kconfig"
  399. source "arch/x86_64/kernel/cpufreq/Kconfig"
  400. endmenu
  401. menu "Bus options (PCI etc.)"
  402. config PCI
  403. bool "PCI support"
  404. # x86-64 doesn't support PCI BIOS access from long mode so always go direct.
  405. config PCI_DIRECT
  406. bool
  407. depends on PCI
  408. default y
  409. config PCI_MMCONFIG
  410. bool "Support mmconfig PCI config space access"
  411. depends on PCI && ACPI
  412. config UNORDERED_IO
  413. bool "Unordered IO mapping access"
  414. depends on EXPERIMENTAL
  415. help
  416. Use unordered stores to access IO memory mappings in device drivers.
  417. Still very experimental. When a driver works on IA64/ppc64/pa-risc it should
  418. work with this option, but it makes the drivers behave differently
  419. from i386. Requires that the driver writer used memory barriers
  420. properly.
  421. source "drivers/pci/pcie/Kconfig"
  422. source "drivers/pci/Kconfig"
  423. source "drivers/pcmcia/Kconfig"
  424. source "drivers/pci/hotplug/Kconfig"
  425. endmenu
  426. menu "Executable file formats / Emulations"
  427. source "fs/Kconfig.binfmt"
  428. config IA32_EMULATION
  429. bool "IA32 Emulation"
  430. help
  431. Include code to run 32-bit programs under a 64-bit kernel. You should likely
  432. turn this on, unless you're 100% sure that you don't have any 32-bit programs
  433. left.
  434. config IA32_AOUT
  435. tristate "IA32 a.out support"
  436. depends on IA32_EMULATION
  437. help
  438. Support old a.out binaries in the 32bit emulation.
  439. config COMPAT
  440. bool
  441. depends on IA32_EMULATION
  442. default y
  443. config SYSVIPC_COMPAT
  444. bool
  445. depends on COMPAT && SYSVIPC
  446. default y
  447. endmenu
  448. source "net/Kconfig"
  449. source drivers/Kconfig
  450. source "drivers/firmware/Kconfig"
  451. source fs/Kconfig
  452. menu "Instrumentation Support"
  453. depends on EXPERIMENTAL
  454. source "arch/x86_64/oprofile/Kconfig"
  455. config KPROBES
  456. bool "Kprobes (EXPERIMENTAL)"
  457. depends on EXPERIMENTAL && MODULES
  458. help
  459. Kprobes allows you to trap at almost any kernel address and
  460. execute a callback function. register_kprobe() establishes
  461. a probepoint and specifies the callback. Kprobes is useful
  462. for kernel debugging, non-intrusive instrumentation and testing.
  463. If in doubt, say "N".
  464. endmenu
  465. source "arch/x86_64/Kconfig.debug"
  466. source "security/Kconfig"
  467. source "crypto/Kconfig"
  468. source "lib/Kconfig"