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 source "init/Kconfig"
  73
  74
  75 menu "Processor type and features"
  76
  77 choice
  78         prompt "Processor family"
  79         default MK8
  80
  81 config MK8
  82         bool "AMD-Opteron/Athlon64"
  83         help
  84           Optimize for AMD Opteron/Athlon64/Hammer/K8 CPUs.
  85
  86 config MPSC
  87        bool "Intel EM64T"
  88        help
  89           Optimize for Intel Pentium 4 and Xeon CPUs with Intel
  90           Extended Memory 64 Technology(EM64T). For details see
  91           <http://www.intel.com/technology/64bitextensions/>.
  92
  93 config GENERIC_CPU
  94         bool "Generic-x86-64"
  95         help
  96           Generic x86-64 CPU.
  97
  98 endchoice
  99
 100 #
 101 # Define implied options from the CPU selection here
 102 #
 103 config X86_L1_CACHE_BYTES
 104         int
 105         default "128" if GENERIC_CPU || MPSC
 106         default "64" if MK8
 107
 108 config X86_L1_CACHE_SHIFT
 109         int
 110         default "7" if GENERIC_CPU || MPSC
 111         default "6" if MK8
 112
 113 config X86_TSC
 114         bool
 115         default y
 116
 117 config X86_GOOD_APIC
 118         bool
 119         default y
 120
 121 config MICROCODE
 122         tristate "/dev/cpu/microcode - Intel CPU microcode support"
 123         ---help---
 124           If you say Y here the 'File systems' section, you will be
 125           able to update the microcode on Intel processors. You will
 126           obviously need the actual microcode binary data itself which is
 127           not shipped with the Linux kernel.
 128
 129           For latest news and information on obtaining all the required
 130           ingredients for this driver, check:
 131           <http://www.urbanmyth.org/microcode/>.
 132
 133           To compile this driver as a module, choose M here: the
 134           module will be called microcode.
 135           If you use modprobe or kmod you may also want to add the line
 136           'alias char-major-10-184 microcode' to your /etc/modules.conf file.
 137
 138 config X86_MSR
 139         tristate "/dev/cpu/*/msr - Model-specific register support"
 140         help
 141           This device gives privileged processes access to the x86
 142           Model-Specific Registers (MSRs).  It is a character device with
 143           major 202 and minors 0 to 31 for /dev/cpu/0/msr to /dev/cpu/31/msr.
 144           MSR accesses are directed to a specific CPU on multi-processor
 145           systems.
 146
 147 config X86_CPUID
 148         tristate "/dev/cpu/*/cpuid - CPU information support"
 149         help
 150           This device gives processes access to the x86 CPUID instruction to
 151           be executed on a specific processor.  It is a character device
 152           with major 203 and minors 0 to 31 for /dev/cpu/0/cpuid to
 153           /dev/cpu/31/cpuid.
 154
 155 config X86_HT
 156         bool
 157         depends on SMP && !MK8
 158         default y
 159
 160 config MATH_EMULATION
 161         bool
 162
 163 config MCA
 164         bool
 165
 166 config EISA
 167         bool
 168
 169 config X86_IO_APIC
 170         bool
 171         default y
 172
 173 config X86_LOCAL_APIC
 174         bool
 175         default y
 176
 177 config MTRR
 178         bool "MTRR (Memory Type Range Register) support"
 179         ---help---
 180           On Intel P6 family processors (Pentium Pro, Pentium II and later)
 181           the Memory Type Range Registers (MTRRs) may be used to control
 182           processor access to memory ranges. This is most useful if you have
 183           a video (VGA) card on a PCI or AGP bus. Enabling write-combining
 184           allows bus write transfers to be combined into a larger transfer
 185           before bursting over the PCI/AGP bus. This can increase performance
 186           of image write operations 2.5 times or more. Saying Y here creates a
 187           /proc/mtrr file which may be used to manipulate your processor's
 188           MTRRs. Typically the X server should use this.
 189
 190           This code has a reasonably generic interface so that similar
 191           control registers on other processors can be easily supported
 192           as well.
 193
 194           Saying Y here also fixes a problem with buggy SMP BIOSes which only
 195           set the MTRRs for the boot CPU and not for the secondary CPUs. This
 196           can lead to all sorts of problems, so it's good to say Y here.
 197
 198           Just say Y here, all x86-64 machines support MTRRs.
 199
 200           See <file:Documentation/mtrr.txt> for more information.
 201
 202 config SMP
 203         bool "Symmetric multi-processing support"
 204         ---help---
 205           This enables support for systems with more than one CPU. If you have
 206           a system with only one CPU, like most personal computers, say N. If
 207           you have a system with more than one CPU, say Y.
 208
 209           If you say N here, the kernel will run on single and multiprocessor
 210           machines, but will use only one CPU of a multiprocessor machine. If
 211           you say Y here, the kernel will run on many, but not all,
 212           singleprocessor machines. On a singleprocessor machine, the kernel
 213           will run faster if you say N here.
 214
 215           If you don't know what to do here, say N.
 216
 217 config SCHED_SMT
 218         bool "SMT (Hyperthreading) scheduler support"
 219         depends on SMP
 220         default n
 221         help
 222           SMT scheduler support improves the CPU scheduler's decision making
 223           when dealing with Intel Pentium 4 chips with HyperThreading at a
 224           cost of slightly increased overhead in some places. If unsure say
 225           N here.
 226
 227 source "kernel/Kconfig.preempt"
 228
 229 config NUMA
 230        bool "Non Uniform Memory Access (NUMA) Support"
 231        depends on SMP
 232        help
 233          Enable NUMA (Non Uniform Memory Access) support. The kernel
 234          will try to allocate memory used by a CPU on the local memory
 235          controller of the CPU and add some more NUMA awareness to the kernel.
 236          This code is recommended on all multiprocessor Opteron systems.
 237          If the system is EM64T, you should say N unless your system is EM64T
 238          NUMA.
 239
 240 config K8_NUMA
 241        bool "Old style AMD Opteron NUMA detection"
 242        depends on NUMA
 243        default y
 244        help
 245          Enable K8 NUMA node topology detection.  You should say Y here if
 246          you have a multi processor AMD K8 system. This uses an old
 247          method to read the NUMA configurtion directly from the builtin
 248          Northbridge of Opteron. It is recommended to use X86_64_ACPI_NUMA
 249          instead, which also takes priority if both are compiled in.
 250
 251 # Dummy CONFIG option to select ACPI_NUMA from drivers/acpi/Kconfig.
 252
 253 config X86_64_ACPI_NUMA
 254        bool "ACPI NUMA detection"
 255        depends on NUMA
 256        select ACPI
 257        select ACPI_NUMA
 258        default y
 259        help
 260          Enable ACPI SRAT based node topology detection.
 261
 262 config NUMA_EMU
 263         bool "NUMA emulation"
 264         depends on NUMA
 265         help
 266           Enable NUMA emulation. A flat machine will be split
 267           into virtual nodes when booted with "numa=fake=N", where N is the
 268           number of nodes. This is only useful for debugging.
 269
 270 config ARCH_DISCONTIGMEM_ENABLE
 271        bool
 272        depends on NUMA
 273        default y
 274
 275
 276 config ARCH_DISCONTIGMEM_ENABLE
 277         def_bool y
 278         depends on NUMA
 279
 280 config ARCH_DISCONTIGMEM_DEFAULT
 281         def_bool y
 282         depends on NUMA
 283
 284 config ARCH_SPARSEMEM_ENABLE
 285         def_bool y
 286         depends on NUMA
 287
 288 config ARCH_FLATMEM_ENABLE
 289         def_bool y
 290         depends on !NUMA
 291
 292 source "mm/Kconfig"
 293
 294 config HAVE_ARCH_EARLY_PFN_TO_NID
 295         def_bool y
 296
 297 config NR_CPUS
 298         int "Maximum number of CPUs (2-256)"
 299         range 2 256
 300         depends on SMP
 301         default "8"
 302         help
 303           This allows you to specify the maximum number of CPUs which this
 304           kernel will support. Current maximum is 256 CPUs due to
 305           APIC addressing limits. Less depending on the hardware.
 306
 307           This is purely to save memory - each supported CPU requires
 308           memory in the static kernel configuration.
 309
 310 config HOTPLUG_CPU
 311         bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
 312         depends on SMP && HOTPLUG && EXPERIMENTAL
 313         help
 314                 Say Y here to experiment with turning CPUs off and on.  CPUs
 315                 can be controlled through /sys/devices/system/cpu/cpu#.
 316                 Say N if you want to disable CPU hotplug.
 317
 318
 319 config HPET_TIMER
 320         bool
 321         default y
 322         help
 323           Use the IA-PC HPET (High Precision Event Timer) to manage
 324           time in preference to the PIT and RTC, if a HPET is
 325           present.  The HPET provides a stable time base on SMP
 326           systems, unlike the TSC, but it is more expensive to access,
 327           as it is off-chip.  You can find the HPET spec at
 328           <http://www.intel.com/hardwaredesign/hpetspec.htm>.
 329
 330 config X86_PM_TIMER
 331         bool "PM timer"
 332         depends on ACPI
 333         default y
 334         help
 335           Support the ACPI PM timer for time keeping. This is slow,
 336           but is useful on some chipsets without HPET on systems with more
 337           than one CPU. On a single processor or single socket multi core
 338           system it is normally not required.
 339           When the PM timer is active 64bit vsyscalls are disabled
 340           and should not be enabled (/proc/sys/kernel/vsyscall64 should
 341           not be changed).
 342           The kernel selects the PM timer only as a last resort, so it is
 343           useful to enable just in case.
 344
 345 config HPET_EMULATE_RTC
 346         bool "Provide RTC interrupt"
 347         depends on HPET_TIMER && RTC=y
 348
 349 config GART_IOMMU
 350         bool "IOMMU support"
 351         default y
 352         depends on PCI
 353         help
 354           Support the IOMMU. Needed to run systems with more than 3GB of memory
 355           properly with 32-bit PCI devices that do not support DAC (Double Address
 356           Cycle). The IOMMU can be turned off at runtime with the iommu=off parameter.
 357           Normally the kernel will take the right choice by itself.
 358           This option includes a driver for the AMD Opteron/Athlon64 IOMMU
 359           and a software emulation used on some other systems.
 360           If unsure, say Y.
 361
 362 # need this always enabled with GART_IOMMU for the VIA workaround
 363 config SWIOTLB
 364        bool
 365        depends on GART_IOMMU
 366        default y
 367
 368 config DUMMY_IOMMU
 369         bool
 370         depends on !GART_IOMMU && !SWIOTLB
 371         default y
 372         help
 373           Don't use IOMMU code. This will cause problems when you have more than 4GB
 374           of memory and any 32-bit devices. Don't turn on unless you know what you
 375           are doing.
 376
 377 config X86_MCE
 378         bool "Machine check support" if EMBEDDED
 379         default y
 380         help
 381            Include a machine check error handler to report hardware errors.
 382            This version will require the mcelog utility to decode some
 383            machine check error logs. See
 384            ftp://ftp.x86-64.org/pub/linux/tools/mcelog
 385
 386 config X86_MCE_INTEL
 387         bool "Intel MCE features"
 388         depends on X86_MCE && X86_LOCAL_APIC
 389         default y
 390         help
 391            Additional support for intel specific MCE features such as
 392            the thermal monitor.
 393
 394 config X86_MCE_AMD
 395         bool "AMD MCE features"
 396         depends on X86_MCE && X86_LOCAL_APIC
 397         default y
 398         help
 399            Additional support for AMD specific MCE features such as
 400            the DRAM Error Threshold.
 401
 402 config PHYSICAL_START
 403         hex "Physical address where the kernel is loaded" if EMBEDDED
 404         default "0x100000"
 405         help
 406           This gives the physical address where the kernel is loaded.
 407           Primarily used in the case of kexec on panic where the
 408           fail safe kernel needs to run at a different address than
 409           the panic-ed kernel.
 410
 411           Don't change this unless you know what you are doing.
 412
 413 config KEXEC
 414         bool "kexec system call (EXPERIMENTAL)"
 415         depends on EXPERIMENTAL
 416         help
 417           kexec is a system call that implements the ability to shutdown your
 418           current kernel, and to start another kernel.  It is like a reboot
 419           but it is indepedent of the system firmware.   And like a reboot
 420           you can start any kernel with it, not just Linux.
 421
 422           The name comes from the similiarity to the exec system call.
 423
 424           It is an ongoing process to be certain the hardware in a machine
 425           is properly shutdown, so do not be surprised if this code does not
 426           initially work for you.  It may help to enable device hotplugging
 427           support.  As of this writing the exact hardware interface is
 428           strongly in flux, so no good recommendation can be made.
 429
 430 config SECCOMP
 431         bool "Enable seccomp to safely compute untrusted bytecode"
 432         depends on PROC_FS
 433         default y
 434         help
 435           This kernel feature is useful for number crunching applications
 436           that may need to compute untrusted bytecode during their
 437           execution. By using pipes or other transports made available to
 438           the process as file descriptors supporting the read/write
 439           syscalls, it's possible to isolate those applications in
 440           their own address space using seccomp. Once seccomp is
 441           enabled via /proc/<pid>/seccomp, it cannot be disabled
 442           and the task is only allowed to execute a few safe syscalls
 443           defined by each seccomp mode.
 444
 445           If unsure, say Y. Only embedded should say N here.
 446
 447 source kernel/Kconfig.hz
 448
 449 endmenu
 450
 451 #
 452 # Use the generic interrupt handling code in kernel/irq/:
 453 #
 454 config GENERIC_HARDIRQS
 455         bool
 456         default y
 457
 458 config GENERIC_IRQ_PROBE
 459         bool
 460         default y
 461
 462 # we have no ISA slots, but we do have ISA-style DMA.
 463 config ISA_DMA_API
 464         bool
 465         default y
 466
 467 config GENERIC_PENDING_IRQ
 468         bool
 469         depends on GENERIC_HARDIRQS && SMP
 470         default y
 471
 472 menu "Power management options"
 473
 474 source kernel/power/Kconfig
 475
 476 source "drivers/acpi/Kconfig"
 477
 478 source "arch/x86_64/kernel/cpufreq/Kconfig"
 479
 480 endmenu
 481
 482 menu "Bus options (PCI etc.)"
 483
 484 config PCI
 485         bool "PCI support"
 486
 487 # x86-64 doesn't support PCI BIOS access from long mode so always go direct.
 488 config PCI_DIRECT
 489         bool
 490         depends on PCI
 491         default y
 492
 493 config PCI_MMCONFIG
 494         bool "Support mmconfig PCI config space access"
 495         depends on PCI && ACPI
 496
 497 config UNORDERED_IO
 498        bool "Unordered IO mapping access"
 499        depends on EXPERIMENTAL
 500        help
 501          Use unordered stores to access IO memory mappings in device drivers.
 502          Still very experimental. When a driver works on IA64/ppc64/pa-risc it should
 503          work with this option, but it makes the drivers behave differently
 504          from i386. Requires that the driver writer used memory barriers
 505          properly.
 506
 507 source "drivers/pci/pcie/Kconfig"
 508
 509 source "drivers/pci/Kconfig"
 510
 511 source "drivers/pcmcia/Kconfig"
 512
 513 source "drivers/pci/hotplug/Kconfig"
 514
 515 endmenu
 516
 517
 518 menu "Executable file formats / Emulations"
 519
 520 source "fs/Kconfig.binfmt"
 521
 522 config IA32_EMULATION
 523         bool "IA32 Emulation"
 524         help
 525           Include code to run 32-bit programs under a 64-bit kernel. You should likely
 526           turn this on, unless you're 100% sure that you don't have any 32-bit programs
 527           left.
 528
 529 config IA32_AOUT
 530        tristate "IA32 a.out support"
 531        depends on IA32_EMULATION
 532        help
 533          Support old a.out binaries in the 32bit emulation.
 534
 535 config COMPAT
 536         bool
 537         depends on IA32_EMULATION
 538         default y
 539
 540 config SYSVIPC_COMPAT
 541         bool
 542         depends on COMPAT && SYSVIPC
 543         default y
 544
 545 config UID16
 546         bool
 547         depends on IA32_EMULATION
 548         default y
 549
 550 endmenu
 551
 552 source "net/Kconfig"
 553
 554 source drivers/Kconfig
 555
 556 source "drivers/firmware/Kconfig"
 557
 558 source fs/Kconfig
 559
 560 menu "Instrumentation Support"
 561         depends on EXPERIMENTAL
 562
 563 source "arch/x86_64/oprofile/Kconfig"
 564
 565 config KPROBES
 566         bool "Kprobes (EXPERIMENTAL)"
 567         help
 568           Kprobes allows you to trap at almost any kernel address and
 569           execute a callback function.  register_kprobe() establishes
 570           a probepoint and specifies the callback.  Kprobes is useful
 571           for kernel debugging, non-intrusive instrumentation and testing.
 572           If in doubt, say "N".
 573 endmenu
 574
 575 source "arch/x86_64/Kconfig.debug"
 576
 577 source "security/Kconfig"
 578
 579 source "crypto/Kconfig"
 580
 581 source "lib/Kconfig"