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
 309
 310 config ARCH_FLATMEM_ENABLE
 311         def_bool y
 312         depends on !NUMA
 313
 314 source "mm/Kconfig"
 315
 316 config HAVE_ARCH_EARLY_PFN_TO_NID
 317         def_bool y
 318
 319 config NR_CPUS
 320         int "Maximum number of CPUs (2-256)"
 321         range 2 256
 322         depends on SMP
 323         default "8"
 324         help
 325           This allows you to specify the maximum number of CPUs which this
 326           kernel will support. Current maximum is 256 CPUs due to
 327           APIC addressing limits. Less depending on the hardware.
 328
 329           This is purely to save memory - each supported CPU requires
 330           memory in the static kernel configuration.
 331
 332 config HOTPLUG_CPU
 333         bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
 334         depends on SMP && HOTPLUG && EXPERIMENTAL
 335         help
 336                 Say Y here to experiment with turning CPUs off and on.  CPUs
 337                 can be controlled through /sys/devices/system/cpu/cpu#.
 338                 Say N if you want to disable CPU hotplug.
 339
 340
 341 config HPET_TIMER
 342         bool
 343         default y
 344         help
 345           Use the IA-PC HPET (High Precision Event Timer) to manage
 346           time in preference to the PIT and RTC, if a HPET is
 347           present.  The HPET provides a stable time base on SMP
 348           systems, unlike the TSC, but it is more expensive to access,
 349           as it is off-chip.  You can find the HPET spec at
 350           <http://www.intel.com/hardwaredesign/hpetspec.htm>.
 351
 352 config X86_PM_TIMER
 353         bool "PM timer"
 354         depends on ACPI
 355         default y
 356         help
 357           Support the ACPI PM timer for time keeping. This is slow,
 358           but is useful on some chipsets without HPET on systems with more
 359           than one CPU. On a single processor or single socket multi core
 360           system it is normally not required.
 361           When the PM timer is active 64bit vsyscalls are disabled
 362           and should not be enabled (/proc/sys/kernel/vsyscall64 should
 363           not be changed).
 364           The kernel selects the PM timer only as a last resort, so it is
 365           useful to enable just in case.
 366
 367 config HPET_EMULATE_RTC
 368         bool "Provide RTC interrupt"
 369         depends on HPET_TIMER && RTC=y
 370
 371 config GART_IOMMU
 372         bool "K8 GART IOMMU support"
 373         default y
 374         select SWIOTLB
 375         depends on PCI
 376         help
 377           Support the IOMMU. Needed to run systems with more than 3GB of memory
 378           properly with 32-bit PCI devices that do not support DAC (Double Address
 379           Cycle). The IOMMU can be turned off at runtime with the iommu=off parameter.
 380           Normally the kernel will take the right choice by itself.
 381           This option includes a driver for the AMD Opteron/Athlon64 northbridge IOMMU
 382           and a software emulation used on other systems.
 383           If unsure, say Y.
 384
 385 # need this always enabled with GART_IOMMU for the VIA workaround
 386 config SWIOTLB
 387         bool
 388         default y
 389         depends on GART_IOMMU
 390
 391 config X86_MCE
 392         bool "Machine check support" if EMBEDDED
 393         default y
 394         help
 395            Include a machine check error handler to report hardware errors.
 396            This version will require the mcelog utility to decode some
 397            machine check error logs. See
 398            ftp://ftp.x86-64.org/pub/linux/tools/mcelog
 399
 400 config X86_MCE_INTEL
 401         bool "Intel MCE features"
 402         depends on X86_MCE && X86_LOCAL_APIC
 403         default y
 404         help
 405            Additional support for intel specific MCE features such as
 406            the thermal monitor.
 407
 408 config X86_MCE_AMD
 409         bool "AMD MCE features"
 410         depends on X86_MCE && X86_LOCAL_APIC
 411         default y
 412         help
 413            Additional support for AMD specific MCE features such as
 414            the DRAM Error Threshold.
 415
 416 config KEXEC
 417         bool "kexec system call (EXPERIMENTAL)"
 418         depends on EXPERIMENTAL
 419         help
 420           kexec is a system call that implements the ability to shutdown your
 421           current kernel, and to start another kernel.  It is like a reboot
 422           but it is indepedent of the system firmware.   And like a reboot
 423           you can start any kernel with it, not just Linux.
 424
 425           The name comes from the similiarity to the exec system call.
 426
 427           It is an ongoing process to be certain the hardware in a machine
 428           is properly shutdown, so do not be surprised if this code does not
 429           initially work for you.  It may help to enable device hotplugging
 430           support.  As of this writing the exact hardware interface is
 431           strongly in flux, so no good recommendation can be made.
 432
 433 config CRASH_DUMP
 434         bool "kernel crash dumps (EXPERIMENTAL)"
 435         depends on EXPERIMENTAL
 436         help
 437                 Generate crash dump after being started by kexec.
 438
 439 config PHYSICAL_START
 440         hex "Physical address where the kernel is loaded" if (EMBEDDED || CRASH_DUMP)
 441         default "0x1000000" if CRASH_DUMP
 442         default "0x100000"
 443         help
 444           This gives the physical address where the kernel is loaded. Normally
 445           for regular kernels this value is 0x100000 (1MB). But in the case
 446           of kexec on panic the fail safe kernel needs to run at a different
 447           address than the panic-ed kernel. This option is used to set the load
 448           address for kernels used to capture crash dump on being kexec'ed
 449           after panic. The default value for crash dump kernels is
 450           0x1000000 (16MB). This can also be set based on the "X" value as
 451           specified in the "crashkernel=YM@XM" command line boot parameter
 452           passed to the panic-ed kernel. Typically this parameter is set as
 453           crashkernel=64M@16M. Please take a look at
 454           Documentation/kdump/kdump.txt for more details about crash dumps.
 455
 456           Don't change this unless you know what you are doing.
 457
 458 config SECCOMP
 459         bool "Enable seccomp to safely compute untrusted bytecode"
 460         depends on PROC_FS
 461         default y
 462         help
 463           This kernel feature is useful for number crunching applications
 464           that may need to compute untrusted bytecode during their
 465           execution. By using pipes or other transports made available to
 466           the process as file descriptors supporting the read/write
 467           syscalls, it's possible to isolate those applications in
 468           their own address space using seccomp. Once seccomp is
 469           enabled via /proc/<pid>/seccomp, it cannot be disabled
 470           and the task is only allowed to execute a few safe syscalls
 471           defined by each seccomp mode.
 472
 473           If unsure, say Y. Only embedded should say N here.
 474
 475 source kernel/Kconfig.hz
 476
 477 endmenu
 478
 479 #
 480 # Use the generic interrupt handling code in kernel/irq/:
 481 #
 482 config GENERIC_HARDIRQS
 483         bool
 484         default y
 485
 486 config GENERIC_IRQ_PROBE
 487         bool
 488         default y
 489
 490 # we have no ISA slots, but we do have ISA-style DMA.
 491 config ISA_DMA_API
 492         bool
 493         default y
 494
 495 config GENERIC_PENDING_IRQ
 496         bool
 497         depends on GENERIC_HARDIRQS && SMP
 498         default y
 499
 500 menu "Power management options"
 501
 502 source kernel/power/Kconfig
 503
 504 source "drivers/acpi/Kconfig"
 505
 506 source "arch/x86_64/kernel/cpufreq/Kconfig"
 507
 508 endmenu
 509
 510 menu "Bus options (PCI etc.)"
 511
 512 config PCI
 513         bool "PCI support"
 514
 515 # x86-64 doesn't support PCI BIOS access from long mode so always go direct.
 516 config PCI_DIRECT
 517         bool
 518         depends on PCI
 519         default y
 520
 521 config PCI_MMCONFIG
 522         bool "Support mmconfig PCI config space access"
 523         depends on PCI && ACPI
 524
 525 config UNORDERED_IO
 526        bool "Unordered IO mapping access"
 527        depends on EXPERIMENTAL
 528        help
 529          Use unordered stores to access IO memory mappings in device drivers.
 530          Still very experimental. When a driver works on IA64/ppc64/pa-risc it should
 531          work with this option, but it makes the drivers behave differently
 532          from i386. Requires that the driver writer used memory barriers
 533          properly.
 534
 535 source "drivers/pci/pcie/Kconfig"
 536
 537 source "drivers/pci/Kconfig"
 538
 539 source "drivers/pcmcia/Kconfig"
 540
 541 source "drivers/pci/hotplug/Kconfig"
 542
 543 endmenu
 544
 545
 546 menu "Executable file formats / Emulations"
 547
 548 source "fs/Kconfig.binfmt"
 549
 550 config IA32_EMULATION
 551         bool "IA32 Emulation"
 552         help
 553           Include code to run 32-bit programs under a 64-bit kernel. You should likely
 554           turn this on, unless you're 100% sure that you don't have any 32-bit programs
 555           left.
 556
 557 config IA32_AOUT
 558        tristate "IA32 a.out support"
 559        depends on IA32_EMULATION
 560        help
 561          Support old a.out binaries in the 32bit emulation.
 562
 563 config COMPAT
 564         bool
 565         depends on IA32_EMULATION
 566         default y
 567
 568 config SYSVIPC_COMPAT
 569         bool
 570         depends on COMPAT && SYSVIPC
 571         default y
 572
 573 endmenu
 574
 575 source "net/Kconfig"
 576
 577 source drivers/Kconfig
 578
 579 source "drivers/firmware/Kconfig"
 580
 581 source fs/Kconfig
 582
 583 menu "Instrumentation Support"
 584         depends on EXPERIMENTAL
 585
 586 source "arch/x86_64/oprofile/Kconfig"
 587
 588 config KPROBES
 589         bool "Kprobes (EXPERIMENTAL)"
 590         help
 591           Kprobes allows you to trap at almost any kernel address and
 592           execute a callback function.  register_kprobe() establishes
 593           a probepoint and specifies the callback.  Kprobes is useful
 594           for kernel debugging, non-intrusive instrumentation and testing.
 595           If in doubt, say "N".
 596 endmenu
 597
 598 source "arch/x86_64/Kconfig.debug"
 599
 600 source "security/Kconfig"
 601
 602 source "crypto/Kconfig"
 603
 604 source "lib/Kconfig"