arch/x86_64/Kconfig

   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
  27 config SEMAPHORE_SLEEPERS
  28         bool
  29         default y
  30
  31 config MMU
  32         bool
  33         default y
  34
  35 config ISA
  36         bool
  37
  38 config SBUS
  39         bool
  40
  41 config RWSEM_GENERIC_SPINLOCK
  42         bool
  43         default y
  44
  45 config RWSEM_XCHGADD_ALGORITHM
  46         bool
  47
  48 config GENERIC_CALIBRATE_DELAY
  49         bool
  50         default y
  51
  52 config X86_CMPXCHG
  53         bool
  54         default y
  55
  56 config EARLY_PRINTK
  57         bool
  58         default y
  59
  60 config GENERIC_ISA_DMA
  61         bool
  62         default y
  63
  64 config GENERIC_IOMAP
  65         bool
  66         default y
  67
  68 config ARCH_MAY_HAVE_PC_FDC
  69         bool
  70         default y
  71
  72 config DMI
  73         bool
  74         default y
  75
  76 source "init/Kconfig"
  77
  78
  79 menu "Processor type and features"
  80
  81 choice
  82         prompt "Subarchitecture Type"
  83         default X86_PC
  84
  85 config X86_PC
  86         bool "PC-compatible"
  87         help
  88           Choose this option if your computer is a standard PC or compatible.
  89
  90 config X86_VSMP
  91         bool "Support for ScaleMP vSMP"
  92          help
  93           Support for ScaleMP vSMP systems.  Say 'Y' here if this kernel is
  94           supposed to run on these EM64T-based machines.  Only choose this option
  95           if you have one of these machines.
  96
  97 endchoice
  98
  99 choice
 100         prompt "Processor family"
 101         default MK8
 102
 103 config MK8
 104         bool "AMD-Opteron/Athlon64"
 105         help
 106           Optimize for AMD Opteron/Athlon64/Hammer/K8 CPUs.
 107
 108 config MPSC
 109        bool "Intel EM64T"
 110        help
 111           Optimize for Intel Pentium 4 and Xeon CPUs with Intel
 112           Extended Memory 64 Technology(EM64T). For details see
 113           <http://www.intel.com/technology/64bitextensions/>.
 114
 115 config GENERIC_CPU
 116         bool "Generic-x86-64"
 117         help
 118           Generic x86-64 CPU.
 119
 120 endchoice
 121
 122 #
 123 # Define implied options from the CPU selection here
 124 #
 125 config X86_L1_CACHE_BYTES
 126         int
 127         default "128" if GENERIC_CPU || MPSC
 128         default "64" if MK8
 129
 130 config X86_L1_CACHE_SHIFT
 131         int
 132         default "7" if GENERIC_CPU || MPSC
 133         default "6" if MK8
 134
 135 config X86_TSC
 136         bool
 137         default y
 138
 139 config X86_GOOD_APIC
 140         bool
 141         default y
 142
 143 config MICROCODE
 144         tristate "/dev/cpu/microcode - Intel CPU microcode support"
 145         ---help---
 146           If you say Y here the 'File systems' section, you will be
 147           able to update the microcode on Intel processors. You will
 148           obviously need the actual microcode binary data itself which is
 149           not shipped with the Linux kernel.
 150
 151           For latest news and information on obtaining all the required
 152           ingredients for this driver, check:
 153           <http://www.urbanmyth.org/microcode/>.
 154
 155           To compile this driver as a module, choose M here: the
 156           module will be called microcode.
 157           If you use modprobe or kmod you may also want to add the line
 158           'alias char-major-10-184 microcode' to your /etc/modules.conf file.
 159
 160 config X86_MSR
 161         tristate "/dev/cpu/*/msr - Model-specific register support"
 162         help
 163           This device gives privileged processes access to the x86
 164           Model-Specific Registers (MSRs).  It is a character device with
 165           major 202 and minors 0 to 31 for /dev/cpu/0/msr to /dev/cpu/31/msr.
 166           MSR accesses are directed to a specific CPU on multi-processor
 167           systems.
 168
 169 config X86_CPUID
 170         tristate "/dev/cpu/*/cpuid - CPU information support"
 171         help
 172           This device gives processes access to the x86 CPUID instruction to
 173           be executed on a specific processor.  It is a character device
 174           with major 203 and minors 0 to 31 for /dev/cpu/0/cpuid to
 175           /dev/cpu/31/cpuid.
 176
 177 config X86_HT
 178         bool
 179         depends on SMP && !MK8
 180         default y
 181
 182 config MATH_EMULATION
 183         bool
 184
 185 config MCA
 186         bool
 187
 188 config EISA
 189         bool
 190
 191 config X86_IO_APIC
 192         bool
 193         default y
 194
 195 config X86_LOCAL_APIC
 196         bool
 197         default y
 198
 199 config MTRR
 200         bool "MTRR (Memory Type Range Register) support"
 201         ---help---
 202           On Intel P6 family processors (Pentium Pro, Pentium II and later)
 203           the Memory Type Range Registers (MTRRs) may be used to control
 204           processor access to memory ranges. This is most useful if you have
 205           a video (VGA) card on a PCI or AGP bus. Enabling write-combining
 206           allows bus write transfers to be combined into a larger transfer
 207           before bursting over the PCI/AGP bus. This can increase performance
 208           of image write operations 2.5 times or more. Saying Y here creates a
 209           /proc/mtrr file which may be used to manipulate your processor's
 210           MTRRs. Typically the X server should use this.
 211
 212           This code has a reasonably generic interface so that similar
 213           control registers on other processors can be easily supported
 214           as well.
 215
 216           Saying Y here also fixes a problem with buggy SMP BIOSes which only
 217           set the MTRRs for the boot CPU and not for the secondary CPUs. This
 218           can lead to all sorts of problems, so it's good to say Y here.
 219
 220           Just say Y here, all x86-64 machines support MTRRs.
 221
 222           See <file:Documentation/mtrr.txt> for more information.
 223
 224 config SMP
 225         bool "Symmetric multi-processing support"
 226         ---help---
 227           This enables support for systems with more than one CPU. If you have
 228           a system with only one CPU, like most personal computers, say N. If
 229           you have a system with more than one CPU, say Y.
 230
 231           If you say N here, the kernel will run on single and multiprocessor
 232           machines, but will use only one CPU of a multiprocessor machine. If
 233           you say Y here, the kernel will run on many, but not all,
 234           singleprocessor machines. On a singleprocessor machine, the kernel
 235           will run faster if you say N here.
 236
 237           If you don't know what to do here, say N.
 238
 239 config SCHED_SMT
 240         bool "SMT (Hyperthreading) scheduler support"
 241         depends on SMP
 242         default n
 243         help
 244           SMT scheduler support improves the CPU scheduler's decision making
 245           when dealing with Intel Pentium 4 chips with HyperThreading at a
 246           cost of slightly increased overhead in some places. If unsure say
 247           N here.
 248
 249 source "kernel/Kconfig.preempt"
 250
 251 config NUMA
 252        bool "Non Uniform Memory Access (NUMA) Support"
 253        depends on SMP
 254        help
 255          Enable NUMA (Non Uniform Memory Access) support. The kernel
 256          will try to allocate memory used by a CPU on the local memory
 257          controller of the CPU and add some more NUMA awareness to the kernel.
 258          This code is recommended on all multiprocessor Opteron systems.
 259          If the system is EM64T, you should say N unless your system is EM64T
 260          NUMA.
 261
 262 config K8_NUMA
 263        bool "Old style AMD Opteron NUMA detection"
 264        depends on NUMA
 265        default y
 266        help
 267          Enable K8 NUMA node topology detection.  You should say Y here if
 268          you have a multi processor AMD K8 system. This uses an old
 269          method to read the NUMA configurtion directly from the builtin
 270          Northbridge of Opteron. It is recommended to use X86_64_ACPI_NUMA
 271          instead, which also takes priority if both are compiled in.
 272
 273 # Dummy CONFIG option to select ACPI_NUMA from drivers/acpi/Kconfig.
 274
 275 config X86_64_ACPI_NUMA
 276        bool "ACPI NUMA detection"
 277        depends on NUMA
 278        select ACPI
 279        select ACPI_NUMA
 280        default y
 281        help
 282          Enable ACPI SRAT based node topology detection.
 283
 284 config NUMA_EMU
 285         bool "NUMA emulation"
 286         depends on NUMA
 287         help
 288           Enable NUMA emulation. A flat machine will be split
 289           into virtual nodes when booted with "numa=fake=N", where N is the
 290           number of nodes. This is only useful for debugging.
 291
 292 config ARCH_DISCONTIGMEM_ENABLE
 293        bool
 294        depends on NUMA
 295        default y
 296
 297
 298 config ARCH_DISCONTIGMEM_ENABLE
 299         def_bool y
 300         depends on NUMA
 301
 302 config ARCH_DISCONTIGMEM_DEFAULT
 303         def_bool y
 304         depends on NUMA
 305
 306 config ARCH_SPARSEMEM_ENABLE
 307         def_bool y
 308         depends on (NUMA || EXPERIMENTAL)
 309
 310 config ARCH_MEMORY_PROBE
 311         def_bool y
 312         depends on MEMORY_HOTPLUG
 313
 314 config ARCH_FLATMEM_ENABLE
 315         def_bool y
 316         depends on !NUMA
 317
 318 source "mm/Kconfig"
 319
 320 config HAVE_ARCH_EARLY_PFN_TO_NID
 321         def_bool y
 322         depends on NUMA
 323
 324 config NR_CPUS
 325         int "Maximum number of CPUs (2-256)"
 326         range 2 256
 327         depends on SMP
 328         default "8"
 329         help
 330           This allows you to specify the maximum number of CPUs which this
 331           kernel will support. Current maximum is 256 CPUs due to
 332           APIC addressing limits. Less depending on the hardware.
 333
 334           This is purely to save memory - each supported CPU requires
 335           memory in the static kernel configuration.
 336
 337 config HOTPLUG_CPU
 338         bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
 339         depends on SMP && HOTPLUG && EXPERIMENTAL
 340         help
 341                 Say Y here to experiment with turning CPUs off and on.  CPUs
 342                 can be controlled through /sys/devices/system/cpu/cpu#.
 343                 Say N if you want to disable CPU hotplug.
 344
 345
 346 config HPET_TIMER
 347         bool
 348         default y
 349         help
 350           Use the IA-PC HPET (High Precision Event Timer) to manage
 351           time in preference to the PIT and RTC, if a HPET is
 352           present.  The HPET provides a stable time base on SMP
 353           systems, unlike the TSC, but it is more expensive to access,
 354           as it is off-chip.  You can find the HPET spec at
 355           <http://www.intel.com/hardwaredesign/hpetspec.htm>.
 356
 357 config HPET_EMULATE_RTC
 358         bool "Provide RTC interrupt"
 359         depends on HPET_TIMER && RTC=y
 360
 361 config GART_IOMMU
 362         bool "K8 GART IOMMU support"
 363         default y
 364         select SWIOTLB
 365         depends on PCI
 366         help
 367           Support the IOMMU. Needed to run systems with more than 3GB of memory
 368           properly with 32-bit PCI devices that do not support DAC (Double Address
 369           Cycle). The IOMMU can be turned off at runtime with the iommu=off parameter.
 370           Normally the kernel will take the right choice by itself.
 371           This option includes a driver for the AMD Opteron/Athlon64 northbridge IOMMU
 372           and a software emulation used on other systems.
 373           If unsure, say Y.
 374
 375 # need this always enabled with GART_IOMMU for the VIA workaround
 376 config SWIOTLB
 377         bool
 378         default y
 379         depends on GART_IOMMU
 380
 381 config X86_MCE
 382         bool "Machine check support" if EMBEDDED
 383         default y
 384         help
 385            Include a machine check error handler to report hardware errors.
 386            This version will require the mcelog utility to decode some
 387            machine check error logs. See
 388            ftp://ftp.x86-64.org/pub/linux/tools/mcelog
 389
 390 config X86_MCE_INTEL
 391         bool "Intel MCE features"
 392         depends on X86_MCE && X86_LOCAL_APIC
 393         default y
 394         help
 395            Additional support for intel specific MCE features such as
 396            the thermal monitor.
 397
 398 config X86_MCE_AMD
 399         bool "AMD MCE features"
 400         depends on X86_MCE && X86_LOCAL_APIC
 401         default y
 402         help
 403            Additional support for AMD specific MCE features such as
 404            the DRAM Error Threshold.
 405
 406 config KEXEC
 407         bool "kexec system call (EXPERIMENTAL)"
 408         depends on EXPERIMENTAL
 409         help
 410           kexec is a system call that implements the ability to shutdown your
 411           current kernel, and to start another kernel.  It is like a reboot
 412           but it is indepedent of the system firmware.   And like a reboot
 413           you can start any kernel with it, not just Linux.
 414
 415           The name comes from the similiarity to the exec system call.
 416
 417           It is an ongoing process to be certain the hardware in a machine
 418           is properly shutdown, so do not be surprised if this code does not
 419           initially work for you.  It may help to enable device hotplugging
 420           support.  As of this writing the exact hardware interface is
 421           strongly in flux, so no good recommendation can be made.
 422
 423 config CRASH_DUMP
 424         bool "kernel crash dumps (EXPERIMENTAL)"
 425         depends on EXPERIMENTAL
 426         help
 427                 Generate crash dump after being started by kexec.
 428
 429 config PHYSICAL_START
 430         hex "Physical address where the kernel is loaded" if (EMBEDDED || CRASH_DUMP)
 431         default "0x1000000" if CRASH_DUMP
 432         default "0x100000"
 433         help
 434           This gives the physical address where the kernel is loaded. Normally
 435           for regular kernels this value is 0x100000 (1MB). But in the case
 436           of kexec on panic the fail safe kernel needs to run at a different
 437           address than the panic-ed kernel. This option is used to set the load
 438           address for kernels used to capture crash dump on being kexec'ed
 439           after panic. The default value for crash dump kernels is
 440           0x1000000 (16MB). This can also be set based on the "X" value as
 441           specified in the "crashkernel=YM@XM" command line boot parameter
 442           passed to the panic-ed kernel. Typically this parameter is set as
 443           crashkernel=64M@16M. Please take a look at
 444           Documentation/kdump/kdump.txt for more details about crash dumps.
 445
 446           Don't change this unless you know what you are doing.
 447
 448 config SECCOMP
 449         bool "Enable seccomp to safely compute untrusted bytecode"
 450         depends on PROC_FS
 451         default y
 452         help
 453           This kernel feature is useful for number crunching applications
 454           that may need to compute untrusted bytecode during their
 455           execution. By using pipes or other transports made available to
 456           the process as file descriptors supporting the read/write
 457           syscalls, it's possible to isolate those applications in
 458           their own address space using seccomp. Once seccomp is
 459           enabled via /proc/<pid>/seccomp, it cannot be disabled
 460           and the task is only allowed to execute a few safe syscalls
 461           defined by each seccomp mode.
 462
 463           If unsure, say Y. Only embedded should say N here.
 464
 465 source kernel/Kconfig.hz
 466
 467 endmenu
 468
 469 #
 470 # Use the generic interrupt handling code in kernel/irq/:
 471 #
 472 config GENERIC_HARDIRQS
 473         bool
 474         default y
 475
 476 config GENERIC_IRQ_PROBE
 477         bool
 478         default y
 479
 480 # we have no ISA slots, but we do have ISA-style DMA.
 481 config ISA_DMA_API
 482         bool
 483         default y
 484
 485 config GENERIC_PENDING_IRQ
 486         bool
 487         depends on GENERIC_HARDIRQS && SMP
 488         default y
 489
 490 menu "Power management options"
 491
 492 source kernel/power/Kconfig
 493
 494 source "drivers/acpi/Kconfig"
 495
 496 source "arch/x86_64/kernel/cpufreq/Kconfig"
 497
 498 endmenu
 499
 500 menu "Bus options (PCI etc.)"
 501
 502 config PCI
 503         bool "PCI support"
 504
 505 # x86-64 doesn't support PCI BIOS access from long mode so always go direct.
 506 config PCI_DIRECT
 507         bool
 508         depends on PCI
 509         default y
 510
 511 config PCI_MMCONFIG
 512         bool "Support mmconfig PCI config space access"
 513         depends on PCI && ACPI
 514
 515 config UNORDERED_IO
 516        bool "Unordered IO mapping access"
 517        depends on EXPERIMENTAL
 518        help
 519          Use unordered stores to access IO memory mappings in device drivers.
 520          Still very experimental. When a driver works on IA64/ppc64/pa-risc it should
 521          work with this option, but it makes the drivers behave differently
 522          from i386. Requires that the driver writer used memory barriers
 523          properly.
 524
 525 source "drivers/pci/pcie/Kconfig"
 526
 527 source "drivers/pci/Kconfig"
 528
 529 source "drivers/pcmcia/Kconfig"
 530
 531 source "drivers/pci/hotplug/Kconfig"
 532
 533 endmenu
 534
 535
 536 menu "Executable file formats / Emulations"
 537
 538 source "fs/Kconfig.binfmt"
 539
 540 config IA32_EMULATION
 541         bool "IA32 Emulation"
 542         help
 543           Include code to run 32-bit programs under a 64-bit kernel. You should likely
 544           turn this on, unless you're 100% sure that you don't have any 32-bit programs
 545           left.
 546
 547 config IA32_AOUT
 548        tristate "IA32 a.out support"
 549        depends on IA32_EMULATION
 550        help
 551          Support old a.out binaries in the 32bit emulation.
 552
 553 config COMPAT
 554         bool
 555         depends on IA32_EMULATION
 556         default y
 557
 558 config SYSVIPC_COMPAT
 559         bool
 560         depends on COMPAT && SYSVIPC
 561         default y
 562
 563 endmenu
 564
 565 source "net/Kconfig"
 566
 567 source drivers/Kconfig
 568
 569 source "drivers/firmware/Kconfig"
 570
 571 source fs/Kconfig
 572
 573 menu "Instrumentation Support"
 574         depends on EXPERIMENTAL
 575
 576 source "arch/x86_64/oprofile/Kconfig"
 577
 578 config KPROBES
 579         bool "Kprobes (EXPERIMENTAL)"
 580         depends on EXPERIMENTAL && MODULES
 581         help
 582           Kprobes allows you to trap at almost any kernel address and
 583           execute a callback function.  register_kprobe() establishes
 584           a probepoint and specifies the callback.  Kprobes is useful
 585           for kernel debugging, non-intrusive instrumentation and testing.
 586           If in doubt, say "N".
 587 endmenu
 588
 589 source "arch/x86_64/Kconfig.debug"
 590
 591 source "security/Kconfig"
 592
 593 source "crypto/Kconfig"
 594
 595 source "lib/Kconfig"