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 MMU
  28         bool
  29         default y
  30
  31 config ISA
  32         bool
  33
  34 config SBUS
  35         bool
  36
  37 config RWSEM_GENERIC_SPINLOCK
  38         bool
  39         default y
  40
  41 config RWSEM_XCHGADD_ALGORITHM
  42         bool
  43
  44 config GENERIC_CALIBRATE_DELAY
  45         bool
  46         default y
  47
  48 config X86_CMPXCHG
  49         bool
  50         default y
  51
  52 config EARLY_PRINTK
  53         bool
  54         default y
  55
  56 config GENERIC_ISA_DMA
  57         bool
  58         default y
  59
  60 config GENERIC_IOMAP
  61         bool
  62         default y
  63
  64 source "init/Kconfig"
  65
  66
  67 menu "Processor type and features"
  68
  69 choice
  70         prompt "Processor family"
  71         default MK8
  72
  73 config MK8
  74         bool "AMD-Opteron/Athlon64"
  75         help
  76           Optimize for AMD Opteron/Athlon64/Hammer/K8 CPUs.
  77
  78 config MPSC
  79        bool "Intel EM64T"
  80        help
  81           Optimize for Intel Pentium 4 and Xeon CPUs with Intel
  82           Extended Memory 64 Technology(EM64T). For details see
  83           <http://www.intel.com/technology/64bitextensions/>.
  84
  85 config GENERIC_CPU
  86         bool "Generic-x86-64"
  87         help
  88           Generic x86-64 CPU.
  89
  90 endchoice
  91
  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
 100 config X86_L1_CACHE_SHIFT
 101         int
 102         default "7" if GENERIC_CPU || MPSC
 103         default "6" if MK8
 104
 105 config X86_TSC
 106         bool
 107         default y
 108
 109 config X86_GOOD_APIC
 110         bool
 111         default y
 112
 113 config MICROCODE
 114         tristate "/dev/cpu/microcode - Intel CPU microcode support"
 115         ---help---
 116           If you say Y here the 'File systems' section, you will be
 117           able to update the microcode on Intel processors. You will
 118           obviously need the actual microcode binary data itself which is
 119           not shipped with the Linux kernel.
 120
 121           For latest news and information on obtaining all the required
 122           ingredients for this driver, check:
 123           <http://www.urbanmyth.org/microcode/>.
 124
 125           To compile this driver as a module, choose M here: the
 126           module will be called microcode.
 127           If you use modprobe or kmod you may also want to add the line
 128           'alias char-major-10-184 microcode' to your /etc/modules.conf file.
 129
 130 config X86_MSR
 131         tristate "/dev/cpu/*/msr - Model-specific register support"
 132         help
 133           This device gives privileged processes access to the x86
 134           Model-Specific Registers (MSRs).  It is a character device with
 135           major 202 and minors 0 to 31 for /dev/cpu/0/msr to /dev/cpu/31/msr.
 136           MSR accesses are directed to a specific CPU on multi-processor
 137           systems.
 138
 139 config X86_CPUID
 140         tristate "/dev/cpu/*/cpuid - CPU information support"
 141         help
 142           This device gives processes access to the x86 CPUID instruction to
 143           be executed on a specific processor.  It is a character device
 144           with major 203 and minors 0 to 31 for /dev/cpu/0/cpuid to
 145           /dev/cpu/31/cpuid.
 146
 147 # disable it for opteron optimized builds because it pulls in ACPI_BOOT
 148 config X86_HT
 149         bool
 150         depends on SMP && !MK8
 151         default y
 152
 153 config MATH_EMULATION
 154         bool
 155
 156 config MCA
 157         bool
 158
 159 config EISA
 160         bool
 161
 162 config X86_IO_APIC
 163         bool
 164         default y
 165
 166 config X86_LOCAL_APIC
 167         bool
 168         default y
 169
 170 config MTRR
 171         bool "MTRR (Memory Type Range Register) support"
 172         ---help---
 173           On Intel P6 family processors (Pentium Pro, Pentium II and later)
 174           the Memory Type Range Registers (MTRRs) may be used to control
 175           processor access to memory ranges. This is most useful if you have
 176           a video (VGA) card on a PCI or AGP bus. Enabling write-combining
 177           allows bus write transfers to be combined into a larger transfer
 178           before bursting over the PCI/AGP bus. This can increase performance
 179           of image write operations 2.5 times or more. Saying Y here creates a
 180           /proc/mtrr file which may be used to manipulate your processor's
 181           MTRRs. Typically the X server should use this.
 182
 183           This code has a reasonably generic interface so that similar
 184           control registers on other processors can be easily supported
 185           as well.
 186
 187           Saying Y here also fixes a problem with buggy SMP BIOSes which only
 188           set the MTRRs for the boot CPU and not for the secondary CPUs. This
 189           can lead to all sorts of problems, so it's good to say Y here.
 190
 191           Just say Y here, all x86-64 machines support MTRRs.
 192
 193           See <file:Documentation/mtrr.txt> for more information.
 194
 195 config SMP
 196         bool "Symmetric multi-processing support"
 197         ---help---
 198           This enables support for systems with more than one CPU. If you have
 199           a system with only one CPU, like most personal computers, say N. If
 200           you have a system with more than one CPU, say Y.
 201
 202           If you say N here, the kernel will run on single and multiprocessor
 203           machines, but will use only one CPU of a multiprocessor machine. If
 204           you say Y here, the kernel will run on many, but not all,
 205           singleprocessor machines. On a singleprocessor machine, the kernel
 206           will run faster if you say N here.
 207
 208           If you don't know what to do here, say N.
 209
 210 config PREEMPT
 211         bool "Preemptible Kernel"
 212         ---help---
 213           This option reduces the latency of the kernel when reacting to
 214           real-time or interactive events by allowing a low priority process to
 215           be preempted even if it is in kernel mode executing a system call.
 216           This allows applications to run more reliably even when the system is
 217           under load. On contrary it may also break your drivers and add
 218           priority inheritance problems to your system. Don't select it if
 219           you rely on a stable system or have slightly obscure hardware.
 220           It's also not very well tested on x86-64 currently.
 221           You have been warned.
 222
 223           Say Y here if you are feeling brave and building a kernel for a
 224           desktop, embedded or real-time system.  Say N if you are unsure.
 225
 226 config PREEMPT_BKL
 227         bool "Preempt The Big Kernel Lock"
 228         depends on PREEMPT
 229         default y
 230         help
 231           This option reduces the latency of the kernel by making the
 232           big kernel lock preemptible.
 233
 234           Say Y here if you are building a kernel for a desktop system.
 235           Say N if you are unsure.
 236
 237 config SCHED_SMT
 238         bool "SMT (Hyperthreading) scheduler support"
 239         depends on SMP
 240         default n
 241         help
 242           SMT scheduler support improves the CPU scheduler's decision making
 243           when dealing with Intel Pentium 4 chips with HyperThreading at a
 244           cost of slightly increased overhead in some places. If unsure say
 245           N here.
 246
 247 config K8_NUMA
 248        bool "K8 NUMA support"
 249        select NUMA
 250        depends on SMP
 251        help
 252           Enable NUMA (Non Unified Memory Architecture) support for
 253           AMD Opteron Multiprocessor systems. The kernel will try to allocate
 254           memory used by a CPU on the local memory controller of the CPU
 255           and add some more NUMA awareness to the kernel.
 256           This code is recommended on all multiprocessor Opteron systems
 257           and normally doesn't hurt on others.
 258
 259 config NUMA_EMU
 260         bool "NUMA emulation support"
 261         select NUMA
 262         depends on SMP
 263         help
 264           Enable NUMA emulation. A flat machine will be split
 265           into virtual nodes when booted with "numa=fake=N", where N is the
 266           number of nodes. This is only useful for debugging.
 267
 268 config DISCONTIGMEM
 269        bool
 270        depends on NUMA
 271        default y
 272
 273 config NUMA
 274        bool
 275        default n
 276
 277 config HAVE_DEC_LOCK
 278         bool
 279         depends on SMP
 280         default y
 281
 282 config NR_CPUS
 283         int "Maximum number of CPUs (2-256)"
 284         range 2 256
 285         depends on SMP
 286         default "8"
 287         help
 288           This allows you to specify the maximum number of CPUs which this
 289           kernel will support. Current maximum is 256 CPUs due to
 290           APIC addressing limits. Less depending on the hardware.
 291
 292           This is purely to save memory - each supported CPU requires
 293           memory in the static kernel configuration.
 294
 295 config HPET_TIMER
 296         bool
 297         default y
 298         help
 299           Use the IA-PC HPET (High Precision Event Timer) to manage
 300           time in preference to the PIT and RTC, if a HPET is
 301           present.  The HPET provides a stable time base on SMP
 302           systems, unlike the TSC, but it is more expensive to access,
 303           as it is off-chip.  You can find the HPET spec at
 304           <http://www.intel.com/labs/platcomp/hpet/hpetspec.htm>.
 305
 306 config HPET_EMULATE_RTC
 307         bool "Provide RTC interrupt"
 308         depends on HPET_TIMER && RTC=y
 309
 310 config GART_IOMMU
 311         bool "IOMMU support"
 312         depends on PCI
 313         help
 314           Support the K8 IOMMU. Needed to run systems with more than 4GB of memory
 315           properly with 32-bit PCI devices that do not support DAC (Double Address
 316           Cycle). The IOMMU can be turned off at runtime with the iommu=off parameter.
 317           Normally the kernel will take the right choice by itself.
 318           If unsure, say Y.
 319
 320 # need this always enabled with GART_IOMMU for the VIA workaround
 321 config SWIOTLB
 322        bool
 323        depends on GART_IOMMU
 324        default y
 325
 326 config DUMMY_IOMMU
 327         bool
 328         depends on !GART_IOMMU && !SWIOTLB
 329         default y
 330         help
 331           Don't use IOMMU code. This will cause problems when you have more than 4GB
 332           of memory and any 32-bit devices. Don't turn on unless you know what you
 333           are doing.
 334
 335 config X86_MCE
 336         bool "Machine check support" if EMBEDDED
 337         default y
 338         help
 339            Include a machine check error handler to report hardware errors.
 340            This version will require the mcelog utility to decode some
 341            machine check error logs. See
 342            ftp://ftp.x86-64.org/pub/linux/tools/mcelog
 343
 344 config X86_MCE_INTEL
 345         bool "Intel MCE features"
 346         depends on X86_MCE && X86_LOCAL_APIC
 347         default y
 348         help
 349            Additional support for intel specific MCE features such as
 350            the thermal monitor.
 351
 352 config SECCOMP
 353         bool "Enable seccomp to safely compute untrusted bytecode"
 354         depends on PROC_FS
 355         default y
 356         help
 357           This kernel feature is useful for number crunching applications
 358           that may need to compute untrusted bytecode during their
 359           execution. By using pipes or other transports made available to
 360           the process as file descriptors supporting the read/write
 361           syscalls, it's possible to isolate those applications in
 362           their own address space using seccomp. Once seccomp is
 363           enabled via /proc/<pid>/seccomp, it cannot be disabled
 364           and the task is only allowed to execute a few safe syscalls
 365           defined by each seccomp mode.
 366
 367           If unsure, say Y. Only embedded should say N here.
 368
 369 endmenu
 370
 371 #
 372 # Use the generic interrupt handling code in kernel/irq/:
 373 #
 374 config GENERIC_HARDIRQS
 375         bool
 376         default y
 377
 378 config GENERIC_IRQ_PROBE
 379         bool
 380         default y
 381
 382 menu "Power management options"
 383
 384 source kernel/power/Kconfig
 385
 386 source "drivers/acpi/Kconfig"
 387
 388 source "arch/x86_64/kernel/cpufreq/Kconfig"
 389
 390 endmenu
 391
 392 menu "Bus options (PCI etc.)"
 393
 394 config PCI
 395         bool "PCI support"
 396
 397 # x86-64 doesn't support PCI BIOS access from long mode so always go direct.
 398 config PCI_DIRECT
 399         bool
 400         depends on PCI
 401         default y
 402
 403 config PCI_MMCONFIG
 404         bool "Support mmconfig PCI config space access"
 405         depends on PCI
 406         select ACPI_BOOT
 407
 408 config UNORDERED_IO
 409        bool "Unordered IO mapping access"
 410        depends on EXPERIMENTAL
 411        help
 412          Use unordered stores to access IO memory mappings in device drivers.
 413          Still very experimental. When a driver works on IA64/ppc64/pa-risc it should
 414          work with this option, but it makes the drivers behave differently
 415          from i386. Requires that the driver writer used memory barriers
 416          properly.
 417
 418 source "drivers/pci/pcie/Kconfig"
 419
 420 source "drivers/pci/Kconfig"
 421
 422 source "drivers/pcmcia/Kconfig"
 423
 424 source "drivers/pci/hotplug/Kconfig"
 425
 426 endmenu
 427
 428
 429 menu "Executable file formats / Emulations"
 430
 431 source "fs/Kconfig.binfmt"
 432
 433 config IA32_EMULATION
 434         bool "IA32 Emulation"
 435         help
 436           Include code to run 32-bit programs under a 64-bit kernel. You should likely
 437           turn this on, unless you're 100% sure that you don't have any 32-bit programs
 438           left.
 439
 440 config IA32_AOUT
 441        bool "IA32 a.out support"
 442        depends on IA32_EMULATION
 443        help
 444          Support old a.out binaries in the 32bit emulation.
 445
 446 config COMPAT
 447         bool
 448         depends on IA32_EMULATION
 449         default y
 450
 451 config SYSVIPC_COMPAT
 452         bool
 453         depends on COMPAT && SYSVIPC
 454         default y
 455
 456 config UID16
 457         bool
 458         depends on IA32_EMULATION
 459         default y
 460
 461 endmenu
 462
 463 source drivers/Kconfig
 464
 465 source "drivers/firmware/Kconfig"
 466
 467 source fs/Kconfig
 468
 469 source "arch/x86_64/oprofile/Kconfig"
 470
 471 source "arch/x86_64/Kconfig.debug"
 472
 473 source "security/Kconfig"
 474
 475 source "crypto/Kconfig"
 476
 477 source "lib/Kconfig"