arch/x86/Kconfig.cpu

   1 # Put here option for CPU selection and depending optimization
   2 if !X86_ELAN
   3
   4 choice
   5         prompt "Processor family"
   6         default M686 if X86_32
   7         default GENERIC_CPU if X86_64
   8
   9 config M386
  10         bool "386"
  11         depends on X86_32 && !UML
  12         ---help---
  13           This is the processor type of your CPU. This information is used for
  14           optimizing purposes. In order to compile a kernel that can run on
  15           all x86 CPU types (albeit not optimally fast), you can specify
  16           "386" here.
  17
  18           The kernel will not necessarily run on earlier architectures than
  19           the one you have chosen, e.g. a Pentium optimized kernel will run on
  20           a PPro, but not necessarily on a i486.
  21
  22           Here are the settings recommended for greatest speed:
  23           - "386" for the AMD/Cyrix/Intel 386DX/DXL/SL/SLC/SX, Cyrix/TI
  24           486DLC/DLC2, and UMC 486SX-S.  Only "386" kernels will run on a 386
  25           class machine.
  26           - "486" for the AMD/Cyrix/IBM/Intel 486DX/DX2/DX4 or
  27           SL/SLC/SLC2/SLC3/SX/SX2 and UMC U5D or U5S.
  28           - "586" for generic Pentium CPUs lacking the TSC
  29           (time stamp counter) register.
  30           - "Pentium-Classic" for the Intel Pentium.
  31           - "Pentium-MMX" for the Intel Pentium MMX.
  32           - "Pentium-Pro" for the Intel Pentium Pro.
  33           - "Pentium-II" for the Intel Pentium II or pre-Coppermine Celeron.
  34           - "Pentium-III" for the Intel Pentium III or Coppermine Celeron.
  35           - "Pentium-4" for the Intel Pentium 4 or P4-based Celeron.
  36           - "K6" for the AMD K6, K6-II and K6-III (aka K6-3D).
  37           - "Athlon" for the AMD K7 family (Athlon/Duron/Thunderbird).
  38           - "Crusoe" for the Transmeta Crusoe series.
  39           - "Efficeon" for the Transmeta Efficeon series.
  40           - "Winchip-C6" for original IDT Winchip.
  41           - "Winchip-2" for IDT Winchips with 3dNow! capabilities.
  42           - "GeodeGX1" for Geode GX1 (Cyrix MediaGX).
  43           - "Geode GX/LX" For AMD Geode GX and LX processors.
  44           - "CyrixIII/VIA C3" for VIA Cyrix III or VIA C3.
  45           - "VIA C3-2" for VIA C3-2 "Nehemiah" (model 9 and above).
  46           - "VIA C7" for VIA C7.
  47
  48           If you don't know what to do, choose "386".
  49
  50 config M486
  51         bool "486"
  52         depends on X86_32
  53         ---help---
  54           Select this for a 486 series processor, either Intel or one of the
  55           compatible processors from AMD, Cyrix, IBM, or Intel.  Includes DX,
  56           DX2, and DX4 variants; also SL/SLC/SLC2/SLC3/SX/SX2 and UMC U5D or
  57           U5S.
  58
  59 config M586
  60         bool "586/K5/5x86/6x86/6x86MX"
  61         depends on X86_32
  62         ---help---
  63           Select this for an 586 or 686 series processor such as the AMD K5,
  64           the Cyrix 5x86, 6x86 and 6x86MX.  This choice does not
  65           assume the RDTSC (Read Time Stamp Counter) instruction.
  66
  67 config M586TSC
  68         bool "Pentium-Classic"
  69         depends on X86_32
  70         ---help---
  71           Select this for a Pentium Classic processor with the RDTSC (Read
  72           Time Stamp Counter) instruction for benchmarking.
  73
  74 config M586MMX
  75         bool "Pentium-MMX"
  76         depends on X86_32
  77         ---help---
  78           Select this for a Pentium with the MMX graphics/multimedia
  79           extended instructions.
  80
  81 config M686
  82         bool "Pentium-Pro"
  83         depends on X86_32
  84         ---help---
  85           Select this for Intel Pentium Pro chips.  This enables the use of
  86           Pentium Pro extended instructions, and disables the init-time guard
  87           against the f00f bug found in earlier Pentiums.
  88
  89 config MPENTIUMII
  90         bool "Pentium-II/Celeron(pre-Coppermine)"
  91         depends on X86_32
  92         ---help---
  93           Select this for Intel chips based on the Pentium-II and
  94           pre-Coppermine Celeron core.  This option enables an unaligned
  95           copy optimization, compiles the kernel with optimization flags
  96           tailored for the chip, and applies any applicable Pentium Pro
  97           optimizations.
  98
  99 config MPENTIUMIII
 100         bool "Pentium-III/Celeron(Coppermine)/Pentium-III Xeon"
 101         depends on X86_32
 102         ---help---
 103           Select this for Intel chips based on the Pentium-III and
 104           Celeron-Coppermine core.  This option enables use of some
 105           extended prefetch instructions in addition to the Pentium II
 106           extensions.
 107
 108 config MPENTIUMM
 109         bool "Pentium M"
 110         depends on X86_32
 111         ---help---
 112           Select this for Intel Pentium M (not Pentium-4 M)
 113           notebook chips.
 114
 115 config MPENTIUM4
 116         bool "Pentium-4/Celeron(P4-based)/Pentium-4 M/older Xeon"
 117         depends on X86_32
 118         ---help---
 119           Select this for Intel Pentium 4 chips.  This includes the
 120           Pentium 4, Pentium D, P4-based Celeron and Xeon, and
 121           Pentium-4 M (not Pentium M) chips.  This option enables compile
 122           flags optimized for the chip, uses the correct cache line size, and
 123           applies any applicable optimizations.
 124
 125           CPUIDs: F[0-6][1-A] (in /proc/cpuinfo show = cpu family : 15 )
 126
 127           Select this for:
 128             Pentiums (Pentium 4, Pentium D, Celeron, Celeron D) corename:
 129                 -Willamette
 130                 -Northwood
 131                 -Mobile Pentium 4
 132                 -Mobile Pentium 4 M
 133                 -Extreme Edition (Gallatin)
 134                 -Prescott
 135                 -Prescott 2M
 136                 -Cedar Mill
 137                 -Presler
 138                 -Smithfiled
 139             Xeons (Intel Xeon, Xeon MP, Xeon LV, Xeon MV) corename:
 140                 -Foster
 141                 -Prestonia
 142                 -Gallatin
 143                 -Nocona
 144                 -Irwindale
 145                 -Cranford
 146                 -Potomac
 147                 -Paxville
 148                 -Dempsey
 149
 150
 151 config MK6
 152         bool "K6/K6-II/K6-III"
 153         depends on X86_32
 154         ---help---
 155           Select this for an AMD K6-family processor.  Enables use of
 156           some extended instructions, and passes appropriate optimization
 157           flags to GCC.
 158
 159 config MK7
 160         bool "Athlon/Duron/K7"
 161         depends on X86_32
 162         ---help---
 163           Select this for an AMD Athlon K7-family processor.  Enables use of
 164           some extended instructions, and passes appropriate optimization
 165           flags to GCC.
 166
 167 config MK8
 168         bool "Opteron/Athlon64/Hammer/K8"
 169         ---help---
 170           Select this for an AMD Opteron or Athlon64 Hammer-family processor.
 171           Enables use of some extended instructions, and passes appropriate
 172           optimization flags to GCC.
 173
 174 config MCRUSOE
 175         bool "Crusoe"
 176         depends on X86_32
 177         ---help---
 178           Select this for a Transmeta Crusoe processor.  Treats the processor
 179           like a 586 with TSC, and sets some GCC optimization flags (like a
 180           Pentium Pro with no alignment requirements).
 181
 182 config MEFFICEON
 183         bool "Efficeon"
 184         depends on X86_32
 185         ---help---
 186           Select this for a Transmeta Efficeon processor.
 187
 188 config MWINCHIPC6
 189         bool "Winchip-C6"
 190         depends on X86_32
 191         ---help---
 192           Select this for an IDT Winchip C6 chip.  Linux and GCC
 193           treat this chip as a 586TSC with some extended instructions
 194           and alignment requirements.
 195
 196 config MWINCHIP3D
 197         bool "Winchip-2/Winchip-2A/Winchip-3"
 198         depends on X86_32
 199         ---help---
 200           Select this for an IDT Winchip-2, 2A or 3.  Linux and GCC
 201           treat this chip as a 586TSC with some extended instructions
 202           and alignment requirements.  Also enable out of order memory
 203           stores for this CPU, which can increase performance of some
 204           operations.
 205
 206 config MGEODEGX1
 207         bool "GeodeGX1"
 208         depends on X86_32
 209         ---help---
 210           Select this for a Geode GX1 (Cyrix MediaGX) chip.
 211
 212 config MGEODE_LX
 213         bool "Geode GX/LX"
 214         depends on X86_32
 215         ---help---
 216           Select this for AMD Geode GX and LX processors.
 217
 218 config MCYRIXIII
 219         bool "CyrixIII/VIA-C3"
 220         depends on X86_32
 221         ---help---
 222           Select this for a Cyrix III or C3 chip.  Presently Linux and GCC
 223           treat this chip as a generic 586. Whilst the CPU is 686 class,
 224           it lacks the cmov extension which gcc assumes is present when
 225           generating 686 code.
 226           Note that Nehemiah (Model 9) and above will not boot with this
 227           kernel due to them lacking the 3DNow! instructions used in earlier
 228           incarnations of the CPU.
 229
 230 config MVIAC3_2
 231         bool "VIA C3-2 (Nehemiah)"
 232         depends on X86_32
 233         ---help---
 234           Select this for a VIA C3 "Nehemiah". Selecting this enables usage
 235           of SSE and tells gcc to treat the CPU as a 686.
 236           Note, this kernel will not boot on older (pre model 9) C3s.
 237
 238 config MVIAC7
 239         bool "VIA C7"
 240         depends on X86_32
 241         ---help---
 242           Select this for a VIA C7.  Selecting this uses the correct cache
 243           shift and tells gcc to treat the CPU as a 686.
 244
 245 config MPSC
 246         bool "Intel P4 / older Netburst based Xeon"
 247         depends on X86_64
 248         ---help---
 249           Optimize for Intel Pentium 4, Pentium D and older Nocona/Dempsey
 250           Xeon CPUs with Intel 64bit which is compatible with x86-64.
 251           Note that the latest Xeons (Xeon 51xx and 53xx) are not based on the
 252           Netburst core and shouldn't use this option. You can distinguish them
 253           using the cpu family field
 254           in /proc/cpuinfo. Family 15 is an older Xeon, Family 6 a newer one.
 255
 256 config MCORE2
 257         bool "Core 2/newer Xeon"
 258         ---help---
 259
 260           Select this for Intel Core 2 and newer Core 2 Xeons (Xeon 51xx and
 261           53xx) CPUs. You can distinguish newer from older Xeons by the CPU
 262           family in /proc/cpuinfo. Newer ones have 6 and older ones 15
 263           (not a typo)
 264
 265 config MATOM
 266         bool "Intel Atom"
 267         ---help---
 268
 269           Select this for the Intel Atom platform. Intel Atom CPUs have an
 270           in-order pipelining architecture and thus can benefit from
 271           accordingly optimized code. Use a recent GCC with specific Atom
 272           support in order to fully benefit from selecting this option.
 273
 274 config GENERIC_CPU
 275         bool "Generic-x86-64"
 276         depends on X86_64
 277         ---help---
 278           Generic x86-64 CPU.
 279           Run equally well on all x86-64 CPUs.
 280
 281 endchoice
 282
 283 config X86_GENERIC
 284         bool "Generic x86 support"
 285         depends on X86_32
 286         ---help---
 287           Instead of just including optimizations for the selected
 288           x86 variant (e.g. PII, Crusoe or Athlon), include some more
 289           generic optimizations as well. This will make the kernel
 290           perform better on x86 CPUs other than that selected.
 291
 292           This is really intended for distributors who need more
 293           generic optimizations.
 294
 295 endif
 296
 297 config X86_CPU
 298         def_bool y
 299         select GENERIC_FIND_FIRST_BIT
 300         select GENERIC_FIND_NEXT_BIT
 301
 302 #
 303 # Define implied options from the CPU selection here
 304 config X86_INTERNODE_CACHE_SHIFT
 305         int
 306         default "12" if X86_VSMP
 307         default "7" if NUMA
 308         default X86_L1_CACHE_SHIFT
 309
 310 config X86_CMPXCHG
 311         def_bool X86_64 || (X86_32 && !M386)
 312
 313 config CMPXCHG_LOCAL
 314         def_bool X86_64 || (X86_32 && !M386)
 315
 316 config X86_L1_CACHE_SHIFT
 317         int
 318         default "7" if MPENTIUM4 || MPSC
 319         default "6" if MK7 || MK8 || MPENTIUMM || MCORE2 || MATOM || MVIAC7 || X86_GENERIC || GENERIC_CPU
 320         default "4" if X86_ELAN || M486 || M386 || MGEODEGX1
 321         default "5" if MWINCHIP3D || MWINCHIPC6 || MCRUSOE || MEFFICEON || MCYRIXIII || MK6 || MPENTIUMIII || MPENTIUMII || M686 || M586MMX || M586TSC || M586 || MVIAC3_2 || MGEODE_LX
 322
 323 config X86_XADD
 324         def_bool y
 325         depends on X86_64 || !M386
 326
 327 config X86_PPRO_FENCE
 328         bool "PentiumPro memory ordering errata workaround"
 329         depends on M686 || M586MMX || M586TSC || M586 || M486 || M386 || MGEODEGX1
 330         ---help---
 331           Old PentiumPro multiprocessor systems had errata that could cause
 332           memory operations to violate the x86 ordering standard in rare cases.
 333           Enabling this option will attempt to work around some (but not all)
 334           occurances of this problem, at the cost of much heavier spinlock and
 335           memory barrier operations.
 336
 337           If unsure, say n here. Even distro kernels should think twice before
 338           enabling this: there are few systems, and an unlikely bug.
 339
 340 config X86_F00F_BUG
 341         def_bool y
 342         depends on M586MMX || M586TSC || M586 || M486 || M386
 343
 344 config X86_INVD_BUG
 345         def_bool y
 346         depends on M486 || M386
 347
 348 config X86_WP_WORKS_OK
 349         def_bool y
 350         depends on !M386
 351
 352 config X86_INVLPG
 353         def_bool y
 354         depends on X86_32 && !M386
 355
 356 config X86_BSWAP
 357         def_bool y
 358         depends on X86_32 && !M386
 359
 360 config X86_POPAD_OK
 361         def_bool y
 362         depends on X86_32 && !M386
 363
 364 config X86_ALIGNMENT_16
 365         def_bool y
 366         depends on MWINCHIP3D || MWINCHIPC6 || MCYRIXIII || X86_ELAN || MK6 || M586MMX || M586TSC || M586 || M486 || MVIAC3_2 || MGEODEGX1
 367
 368 config X86_INTEL_USERCOPY
 369         def_bool y
 370         depends on MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M586MMX || X86_GENERIC || MK8 || MK7 || MEFFICEON || MCORE2
 371
 372 config X86_USE_PPRO_CHECKSUM
 373         def_bool y
 374         depends on MWINCHIP3D || MWINCHIPC6 || MCYRIXIII || MK7 || MK6 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || MK8 || MVIAC3_2 || MEFFICEON || MGEODE_LX || MCORE2 || MATOM
 375
 376 config X86_USE_3DNOW
 377         def_bool y
 378         depends on (MCYRIXIII || MK7 || MGEODE_LX) && !UML
 379
 380 config X86_OOSTORE
 381         def_bool y
 382         depends on (MWINCHIP3D || MWINCHIPC6) && MTRR
 383
 384 #
 385 # P6_NOPs are a relatively minor optimization that require a family >=
 386 # 6 processor, except that it is broken on certain VIA chips.
 387 # Furthermore, AMD chips prefer a totally different sequence of NOPs
 388 # (which work on all CPUs).  In addition, it looks like Virtual PC
 389 # does not understand them.
 390 #
 391 # As a result, disallow these if we're not compiling for X86_64 (these
 392 # NOPs do work on all x86-64 capable chips); the list of processors in
 393 # the right-hand clause are the cores that benefit from this optimization.
 394 #
 395 config X86_P6_NOP
 396         def_bool y
 397         depends on X86_64
 398         depends on (MCORE2 || MPENTIUM4 || MPSC)
 399
 400 config X86_TSC
 401         def_bool y
 402         depends on ((MWINCHIP3D || MCRUSOE || MEFFICEON || MCYRIXIII || MK7 || MK6 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || M586MMX || M586TSC || MK8 || MVIAC3_2 || MVIAC7 || MGEODEGX1 || MGEODE_LX || MCORE2 || MATOM) && !X86_NUMAQ) || X86_64
 403
 404 config X86_CMPXCHG64
 405         def_bool y
 406         depends on X86_PAE || X86_64 || MCORE2 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || MATOM
 407
 408 # this should be set for all -march=.. options where the compiler
 409 # generates cmov.
 410 config X86_CMOV
 411         def_bool y
 412         depends on (MK8 || MK7 || MCORE2 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || MVIAC3_2 || MVIAC7 || MCRUSOE || MEFFICEON || X86_64 || MATOM || MGEODE_LX)
 413
 414 config X86_MINIMUM_CPU_FAMILY
 415         int
 416         default "64" if X86_64
 417         default "6" if X86_32 && X86_P6_NOP
 418         default "5" if X86_32 && X86_CMPXCHG64
 419         default "4" if X86_32 && (X86_XADD || X86_CMPXCHG || X86_BSWAP || X86_WP_WORKS_OK)
 420         default "3"
 421
 422 config X86_DEBUGCTLMSR
 423         def_bool y
 424         depends on !(MK6 || MWINCHIPC6 || MWINCHIP3D || MCYRIXIII || M586MMX || M586TSC || M586 || M486 || M386) && !UML
 425
 426 menuconfig PROCESSOR_SELECT
 427         bool "Supported processor vendors" if EXPERT
 428         ---help---
 429           This lets you choose what x86 vendor support code your kernel
 430           will include.
 431
 432 config CPU_SUP_INTEL
 433         default y
 434         bool "Support Intel processors" if PROCESSOR_SELECT
 435         ---help---
 436           This enables detection, tunings and quirks for Intel processors
 437
 438           You need this enabled if you want your kernel to run on an
 439           Intel CPU. Disabling this option on other types of CPUs
 440           makes the kernel a tiny bit smaller. Disabling it on an Intel
 441           CPU might render the kernel unbootable.
 442
 443           If unsure, say N.
 444
 445 config CPU_SUP_CYRIX_32
 446         default y
 447         bool "Support Cyrix processors" if PROCESSOR_SELECT
 448         depends on !64BIT
 449         ---help---
 450           This enables detection, tunings and quirks for Cyrix processors
 451
 452           You need this enabled if you want your kernel to run on a
 453           Cyrix CPU. Disabling this option on other types of CPUs
 454           makes the kernel a tiny bit smaller. Disabling it on a Cyrix
 455           CPU might render the kernel unbootable.
 456
 457           If unsure, say N.
 458
 459 config CPU_SUP_AMD
 460         default y
 461         bool "Support AMD processors" if PROCESSOR_SELECT
 462         ---help---
 463           This enables detection, tunings and quirks for AMD processors
 464
 465           You need this enabled if you want your kernel to run on an
 466           AMD CPU. Disabling this option on other types of CPUs
 467           makes the kernel a tiny bit smaller. Disabling it on an AMD
 468           CPU might render the kernel unbootable.
 469
 470           If unsure, say N.
 471
 472 config CPU_SUP_CENTAUR
 473         default y
 474         bool "Support Centaur processors" if PROCESSOR_SELECT
 475         ---help---
 476           This enables detection, tunings and quirks for Centaur processors
 477
 478           You need this enabled if you want your kernel to run on a
 479           Centaur CPU. Disabling this option on other types of CPUs
 480           makes the kernel a tiny bit smaller. Disabling it on a Centaur
 481           CPU might render the kernel unbootable.
 482
 483           If unsure, say N.
 484
 485 config CPU_SUP_TRANSMETA_32
 486         default y
 487         bool "Support Transmeta processors" if PROCESSOR_SELECT
 488         depends on !64BIT
 489         ---help---
 490           This enables detection, tunings and quirks for Transmeta processors
 491
 492           You need this enabled if you want your kernel to run on a
 493           Transmeta CPU. Disabling this option on other types of CPUs
 494           makes the kernel a tiny bit smaller. Disabling it on a Transmeta
 495           CPU might render the kernel unbootable.
 496
 497           If unsure, say N.
 498
 499 config CPU_SUP_UMC_32
 500         default y
 501         bool "Support UMC processors" if PROCESSOR_SELECT
 502         depends on !64BIT
 503         ---help---
 504           This enables detection, tunings and quirks for UMC processors
 505
 506           You need this enabled if you want your kernel to run on a
 507           UMC CPU. Disabling this option on other types of CPUs
 508           makes the kernel a tiny bit smaller. Disabling it on a UMC
 509           CPU might render the kernel unbootable.
 510
 511           If unsure, say N.