arch/i386/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
   7
   8 config M386
   9         bool "386"
  10         depends on !UML
  11         ---help---
  12           This is the processor type of your CPU. This information is used for
  13           optimizing purposes. In order to compile a kernel that can run on
  14           all x86 CPU types (albeit not optimally fast), you can specify
  15           "386" here.
  16
  17           The kernel will not necessarily run on earlier architectures than
  18           the one you have chosen, e.g. a Pentium optimized kernel will run on
  19           a PPro, but not necessarily on a i486.
  20
  21           Here are the settings recommended for greatest speed:
  22           - "386" for the AMD/Cyrix/Intel 386DX/DXL/SL/SLC/SX, Cyrix/TI
  23           486DLC/DLC2, UMC 486SX-S and NexGen Nx586.  Only "386" kernels
  24           will run on a 386 class machine.
  25           - "486" for the AMD/Cyrix/IBM/Intel 486DX/DX2/DX4 or
  26           SL/SLC/SLC2/SLC3/SX/SX2 and UMC U5D or U5S.
  27           - "586" for generic Pentium CPUs lacking the TSC
  28           (time stamp counter) register.
  29           - "Pentium-Classic" for the Intel Pentium.
  30           - "Pentium-MMX" for the Intel Pentium MMX.
  31           - "Pentium-Pro" for the Intel Pentium Pro.
  32           - "Pentium-II" for the Intel Pentium II or pre-Coppermine Celeron.
  33           - "Pentium-III" for the Intel Pentium III or Coppermine Celeron.
  34           - "Pentium-4" for the Intel Pentium 4 or P4-based Celeron.
  35           - "K6" for the AMD K6, K6-II and K6-III (aka K6-3D).
  36           - "Athlon" for the AMD K7 family (Athlon/Duron/Thunderbird).
  37           - "Crusoe" for the Transmeta Crusoe series.
  38           - "Efficeon" for the Transmeta Efficeon series.
  39           - "Winchip-C6" for original IDT Winchip.
  40           - "Winchip-2" for IDT Winchip 2.
  41           - "Winchip-2A" 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
  47           If you don't know what to do, choose "386".
  48
  49 config M486
  50         bool "486"
  51         help
  52           Select this for a 486 series processor, either Intel or one of the
  53           compatible processors from AMD, Cyrix, IBM, or Intel.  Includes DX,
  54           DX2, and DX4 variants; also SL/SLC/SLC2/SLC3/SX/SX2 and UMC U5D or
  55           U5S.
  56
  57 config M586
  58         bool "586/K5/5x86/6x86/6x86MX"
  59         help
  60           Select this for an 586 or 686 series processor such as the AMD K5,
  61           the Cyrix 5x86, 6x86 and 6x86MX.  This choice does not
  62           assume the RDTSC (Read Time Stamp Counter) instruction.
  63
  64 config M586TSC
  65         bool "Pentium-Classic"
  66         help
  67           Select this for a Pentium Classic processor with the RDTSC (Read
  68           Time Stamp Counter) instruction for benchmarking.
  69
  70 config M586MMX
  71         bool "Pentium-MMX"
  72         help
  73           Select this for a Pentium with the MMX graphics/multimedia
  74           extended instructions.
  75
  76 config M686
  77         bool "Pentium-Pro"
  78         help
  79           Select this for Intel Pentium Pro chips.  This enables the use of
  80           Pentium Pro extended instructions, and disables the init-time guard
  81           against the f00f bug found in earlier Pentiums.
  82
  83 config MPENTIUMII
  84         bool "Pentium-II/Celeron(pre-Coppermine)"
  85         help
  86           Select this for Intel chips based on the Pentium-II and
  87           pre-Coppermine Celeron core.  This option enables an unaligned
  88           copy optimization, compiles the kernel with optimization flags
  89           tailored for the chip, and applies any applicable Pentium Pro
  90           optimizations.
  91
  92 config MPENTIUMIII
  93         bool "Pentium-III/Celeron(Coppermine)/Pentium-III Xeon"
  94         help
  95           Select this for Intel chips based on the Pentium-III and
  96           Celeron-Coppermine core.  This option enables use of some
  97           extended prefetch instructions in addition to the Pentium II
  98           extensions.
  99
 100 config MPENTIUMM
 101         bool "Pentium M"
 102         help
 103           Select this for Intel Pentium M (not Pentium-4 M)
 104           notebook chips.
 105
 106 config MCORE2
 107         bool "Core 2/newer Xeon"
 108         help
 109           Select this for Intel Core 2 and newer Core 2 Xeons (Xeon 51xx and 53xx)
 110           CPUs. You can distingush newer from older Xeons by the CPU family
 111           in /proc/cpuinfo. Newer ones have 6.
 112
 113 config MPENTIUM4
 114         bool "Pentium-4/Celeron(P4-based)/Pentium-4 M/older Xeon"
 115         help
 116           Select this for Intel Pentium 4 chips.  This includes the
 117           Pentium 4, P4-based Celeron and Xeon, and Pentium-4 M
 118           (not Pentium M) chips.  This option enables compile flags
 119           optimized for the chip, uses the correct cache shift, and
 120           applies any applicable Pentium III optimizations.
 121
 122 config MK6
 123         bool "K6/K6-II/K6-III"
 124         help
 125           Select this for an AMD K6-family processor.  Enables use of
 126           some extended instructions, and passes appropriate optimization
 127           flags to GCC.
 128
 129 config MK7
 130         bool "Athlon/Duron/K7"
 131         help
 132           Select this for an AMD Athlon K7-family processor.  Enables use of
 133           some extended instructions, and passes appropriate optimization
 134           flags to GCC.
 135
 136 config MK8
 137         bool "Opteron/Athlon64/Hammer/K8"
 138         help
 139           Select this for an AMD Opteron or Athlon64 Hammer-family processor.  Enables
 140           use of some extended instructions, and passes appropriate optimization
 141           flags to GCC.
 142
 143 config MCRUSOE
 144         bool "Crusoe"
 145         help
 146           Select this for a Transmeta Crusoe processor.  Treats the processor
 147           like a 586 with TSC, and sets some GCC optimization flags (like a
 148           Pentium Pro with no alignment requirements).
 149
 150 config MEFFICEON
 151         bool "Efficeon"
 152         help
 153           Select this for a Transmeta Efficeon processor.
 154
 155 config MWINCHIPC6
 156         bool "Winchip-C6"
 157         help
 158           Select this for an IDT Winchip C6 chip.  Linux and GCC
 159           treat this chip as a 586TSC with some extended instructions
 160           and alignment requirements.
 161
 162 config MWINCHIP2
 163         bool "Winchip-2"
 164         help
 165           Select this for an IDT Winchip-2.  Linux and GCC
 166           treat this chip as a 586TSC with some extended instructions
 167           and alignment requirements.
 168
 169 config MWINCHIP3D
 170         bool "Winchip-2A/Winchip-3"
 171         help
 172           Select this for an IDT Winchip-2A or 3.  Linux and GCC
 173           treat this chip as a 586TSC with some extended instructions
 174           and alignment reqirements.  Also enable out of order memory
 175           stores for this CPU, which can increase performance of some
 176           operations.
 177
 178 config MGEODEGX1
 179         bool "GeodeGX1"
 180         help
 181           Select this for a Geode GX1 (Cyrix MediaGX) chip.
 182
 183 config MGEODE_LX
 184        bool "Geode GX/LX"
 185        help
 186          Select this for AMD Geode GX and LX processors.
 187
 188 config MCYRIXIII
 189         bool "CyrixIII/VIA-C3"
 190         help
 191           Select this for a Cyrix III or C3 chip.  Presently Linux and GCC
 192           treat this chip as a generic 586. Whilst the CPU is 686 class,
 193           it lacks the cmov extension which gcc assumes is present when
 194           generating 686 code.
 195           Note that Nehemiah (Model 9) and above will not boot with this
 196           kernel due to them lacking the 3DNow! instructions used in earlier
 197           incarnations of the CPU.
 198
 199 config MVIAC3_2
 200         bool "VIA C3-2 (Nehemiah)"
 201         help
 202           Select this for a VIA C3 "Nehemiah". Selecting this enables usage
 203           of SSE and tells gcc to treat the CPU as a 686.
 204           Note, this kernel will not boot on older (pre model 9) C3s.
 205
 206 endchoice
 207
 208 config X86_GENERIC
 209        bool "Generic x86 support"
 210        help
 211           Instead of just including optimizations for the selected
 212           x86 variant (e.g. PII, Crusoe or Athlon), include some more
 213           generic optimizations as well. This will make the kernel
 214           perform better on x86 CPUs other than that selected.
 215
 216           This is really intended for distributors who need more
 217           generic optimizations.
 218
 219 endif
 220
 221 #
 222 # Define implied options from the CPU selection here
 223 #
 224 config X86_CMPXCHG
 225         bool
 226         depends on !M386
 227         default y
 228
 229 config X86_XADD
 230         bool
 231         depends on !M386
 232         default y
 233
 234 config X86_L1_CACHE_SHIFT
 235         int
 236         default "7" if MPENTIUM4 || X86_GENERIC
 237         default "4" if X86_ELAN || M486 || M386 || MGEODEGX1
 238         default "5" if MWINCHIP3D || MWINCHIP2 || MWINCHIPC6 || MCRUSOE || MEFFICEON || MCYRIXIII || MK6 || MPENTIUMIII || MPENTIUMII || M686 || M586MMX || M586TSC || M586 || MVIAC3_2 || MGEODE_LX
 239         default "6" if MK7 || MK8 || MPENTIUMM || MCORE2
 240
 241 config RWSEM_GENERIC_SPINLOCK
 242         bool
 243         depends on M386
 244         default y
 245
 246 config RWSEM_XCHGADD_ALGORITHM
 247         bool
 248         depends on !M386
 249         default y
 250
 251 config ARCH_HAS_ILOG2_U32
 252         bool
 253         default n
 254
 255 config ARCH_HAS_ILOG2_U64
 256         bool
 257         default n
 258
 259 config GENERIC_CALIBRATE_DELAY
 260         bool
 261         default y
 262
 263 config X86_PPRO_FENCE
 264         bool
 265         depends on M686 || M586MMX || M586TSC || M586 || M486 || M386 || MGEODEGX1
 266         default y
 267
 268 config X86_F00F_BUG
 269         bool
 270         depends on M586MMX || M586TSC || M586 || M486 || M386
 271         default y
 272
 273 config X86_WP_WORKS_OK
 274         bool
 275         depends on !M386
 276         default y
 277
 278 config X86_INVLPG
 279         bool
 280         depends on !M386
 281         default y
 282
 283 config X86_BSWAP
 284         bool
 285         depends on !M386
 286         default y
 287
 288 config X86_POPAD_OK
 289         bool
 290         depends on !M386
 291         default y
 292
 293 config X86_CMPXCHG64
 294         bool
 295         depends on !M386 && !M486
 296         default y
 297
 298 config X86_ALIGNMENT_16
 299         bool
 300         depends on MWINCHIP3D || MWINCHIP2 || MWINCHIPC6 || MCYRIXIII || X86_ELAN || MK6 || M586MMX || M586TSC || M586 || M486 || MVIAC3_2 || MGEODEGX1
 301         default y
 302
 303 config X86_GOOD_APIC
 304         bool
 305         depends on MK7 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || M586MMX || MK8 || MEFFICEON || MCORE2
 306         default y
 307
 308 config X86_INTEL_USERCOPY
 309         bool
 310         depends on MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M586MMX || X86_GENERIC || MK8 || MK7 || MEFFICEON || MCORE2
 311         default y
 312
 313 config X86_USE_PPRO_CHECKSUM
 314         bool
 315         depends on MWINCHIP3D || MWINCHIP2 || MWINCHIPC6 || MCYRIXIII || MK7 || MK6 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || MK8 || MVIAC3_2 || MEFFICEON || MGEODE_LX || MCORE2
 316         default y
 317
 318 config X86_USE_3DNOW
 319         bool
 320         depends on (MCYRIXIII || MK7 || MGEODE_LX) && !UML
 321         default y
 322
 323 config X86_OOSTORE
 324         bool
 325         depends on (MWINCHIP3D || MWINCHIP2 || MWINCHIPC6) && MTRR
 326         default y
 327
 328 config X86_TSC
 329         bool
 330         depends on (MWINCHIP3D || MWINCHIP2 || MCRUSOE || MEFFICEON || MCYRIXIII || MK7 || MK6 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || M586MMX || M586TSC || MK8 || MVIAC3_2 || MGEODEGX1 || MGEODE_LX || MCORE2) && !X86_NUMAQ
 331         default y