1# Put here option for CPU selection and depending optimization 2choice 3 prompt "Processor family" 4 default M686 if X86_32 5 default GENERIC_CPU if X86_64 6 ---help--- 7 This is the processor type of your CPU. This information is 8 used for optimizing purposes. In order to compile a kernel 9 that can run on all supported x86 CPU types (albeit not 10 optimally fast), you can specify "486" here. 11 12 Note that the 386 is no longer supported, this includes 13 AMD/Cyrix/Intel 386DX/DXL/SL/SLC/SX, Cyrix/TI 486DLC/DLC2, 14 UMC 486SX-S and the NexGen Nx586. 15 16 The kernel will not necessarily run on earlier architectures than 17 the one you have chosen, e.g. a Pentium optimized kernel will run on 18 a PPro, but not necessarily on a i486. 19 20 Here are the settings recommended for greatest speed: 21 - "486" for the AMD/Cyrix/IBM/Intel 486DX/DX2/DX4 or 22 SL/SLC/SLC2/SLC3/SX/SX2 and UMC U5D or U5S. 23 - "586" for generic Pentium CPUs lacking the TSC 24 (time stamp counter) register. 25 - "Pentium-Classic" for the Intel Pentium. 26 - "Pentium-MMX" for the Intel Pentium MMX. 27 - "Pentium-Pro" for the Intel Pentium Pro. 28 - "Pentium-II" for the Intel Pentium II or pre-Coppermine Celeron. 29 - "Pentium-III" for the Intel Pentium III or Coppermine Celeron. 30 - "Pentium-4" for the Intel Pentium 4 or P4-based Celeron. 31 - "K6" for the AMD K6, K6-II and K6-III (aka K6-3D). 32 - "Athlon" for the AMD K7 family (Athlon/Duron/Thunderbird). 33 - "Opteron/Athlon64/Hammer/K8" for all K8 and newer AMD CPUs. 34 - "Crusoe" for the Transmeta Crusoe series. 35 - "Efficeon" for the Transmeta Efficeon series. 36 - "Winchip-C6" for original IDT Winchip. 37 - "Winchip-2" for IDT Winchips with 3dNow! capabilities. 38 - "AMD Elan" for the 32-bit AMD Elan embedded CPU. 39 - "GeodeGX1" for Geode GX1 (Cyrix MediaGX). 40 - "Geode GX/LX" For AMD Geode GX and LX processors. 41 - "CyrixIII/VIA C3" for VIA Cyrix III or VIA C3. 42 - "VIA C3-2" for VIA C3-2 "Nehemiah" (model 9 and above). 43 - "VIA C7" for VIA C7. 44 - "Intel P4" for the Pentium 4/Netburst microarchitecture. 45 - "Core 2/newer Xeon" for all core2 and newer Intel CPUs. 46 - "Intel Atom" for the Atom-microarchitecture CPUs. 47 - "Generic-x86-64" for a kernel which runs on any x86-64 CPU. 48 49 See each option's help text for additional details. If you don't know 50 what to do, choose "486". 51 52config M486 53 bool "486" 54 depends on X86_32 55 ---help--- 56 Select this for an 486-class CPU such as AMD/Cyrix/IBM/Intel 57 486DX/DX2/DX4 or SL/SLC/SLC2/SLC3/SX/SX2 and UMC U5D or U5S. 58 59config 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 67config 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 74config 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 81config 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 89config 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 99config 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 108config 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 115config 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 151config 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 159config 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 167config 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 174config 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 182config MEFFICEON 183 bool "Efficeon" 184 depends on X86_32 185 ---help--- 186 Select this for a Transmeta Efficeon processor. 187 188config 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 196config 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 206config MELAN 207 bool "AMD Elan" 208 depends on X86_32 209 ---help--- 210 Select this for an AMD Elan processor. 211 212 Do not use this option for K6/Athlon/Opteron processors! 213 214config MGEODEGX1 215 bool "GeodeGX1" 216 depends on X86_32 217 ---help--- 218 Select this for a Geode GX1 (Cyrix MediaGX) chip. 219 220config MGEODE_LX 221 bool "Geode GX/LX" 222 depends on X86_32 223 ---help--- 224 Select this for AMD Geode GX and LX processors. 225 226config MCYRIXIII 227 bool "CyrixIII/VIA-C3" 228 depends on X86_32 229 ---help--- 230 Select this for a Cyrix III or C3 chip. Presently Linux and GCC 231 treat this chip as a generic 586. Whilst the CPU is 686 class, 232 it lacks the cmov extension which gcc assumes is present when 233 generating 686 code. 234 Note that Nehemiah (Model 9) and above will not boot with this 235 kernel due to them lacking the 3DNow! instructions used in earlier 236 incarnations of the CPU. 237 238config MVIAC3_2 239 bool "VIA C3-2 (Nehemiah)" 240 depends on X86_32 241 ---help--- 242 Select this for a VIA C3 "Nehemiah". Selecting this enables usage 243 of SSE and tells gcc to treat the CPU as a 686. 244 Note, this kernel will not boot on older (pre model 9) C3s. 245 246config MVIAC7 247 bool "VIA C7" 248 depends on X86_32 249 ---help--- 250 Select this for a VIA C7. Selecting this uses the correct cache 251 shift and tells gcc to treat the CPU as a 686. 252 253config MPSC 254 bool "Intel P4 / older Netburst based Xeon" 255 depends on X86_64 256 ---help--- 257 Optimize for Intel Pentium 4, Pentium D and older Nocona/Dempsey 258 Xeon CPUs with Intel 64bit which is compatible with x86-64. 259 Note that the latest Xeons (Xeon 51xx and 53xx) are not based on the 260 Netburst core and shouldn't use this option. You can distinguish them 261 using the cpu family field 262 in /proc/cpuinfo. Family 15 is an older Xeon, Family 6 a newer one. 263 264config MCORE2 265 bool "Core 2/newer Xeon" 266 ---help--- 267 268 Select this for Intel Core 2 and newer Core 2 Xeons (Xeon 51xx and 269 53xx) CPUs. You can distinguish newer from older Xeons by the CPU 270 family in /proc/cpuinfo. Newer ones have 6 and older ones 15 271 (not a typo) 272 273config MATOM 274 bool "Intel Atom" 275 ---help--- 276 277 Select this for the Intel Atom platform. Intel Atom CPUs have an 278 in-order pipelining architecture and thus can benefit from 279 accordingly optimized code. Use a recent GCC with specific Atom 280 support in order to fully benefit from selecting this option. 281 282config GENERIC_CPU 283 bool "Generic-x86-64" 284 depends on X86_64 285 ---help--- 286 Generic x86-64 CPU. 287 Run equally well on all x86-64 CPUs. 288 289endchoice 290 291config X86_GENERIC 292 bool "Generic x86 support" 293 depends on X86_32 294 ---help--- 295 Instead of just including optimizations for the selected 296 x86 variant (e.g. PII, Crusoe or Athlon), include some more 297 generic optimizations as well. This will make the kernel 298 perform better on x86 CPUs other than that selected. 299 300 This is really intended for distributors who need more 301 generic optimizations. 302 303# 304# Define implied options from the CPU selection here 305config X86_INTERNODE_CACHE_SHIFT 306 int 307 default "12" if X86_VSMP 308 default X86_L1_CACHE_SHIFT 309 310config X86_L1_CACHE_SHIFT 311 int 312 default "7" if MPENTIUM4 || MPSC 313 default "6" if MK7 || MK8 || MPENTIUMM || MCORE2 || MATOM || MVIAC7 || X86_GENERIC || GENERIC_CPU 314 default "4" if MELAN || M486 || MGEODEGX1 315 default "5" if MWINCHIP3D || MWINCHIPC6 || MCRUSOE || MEFFICEON || MCYRIXIII || MK6 || MPENTIUMIII || MPENTIUMII || M686 || M586MMX || M586TSC || M586 || MVIAC3_2 || MGEODE_LX 316 317config X86_PPRO_FENCE 318 bool "PentiumPro memory ordering errata workaround" 319 depends on M686 || M586MMX || M586TSC || M586 || M486 || MGEODEGX1 320 ---help--- 321 Old PentiumPro multiprocessor systems had errata that could cause 322 memory operations to violate the x86 ordering standard in rare cases. 323 Enabling this option will attempt to work around some (but not all) 324 occurrences of this problem, at the cost of much heavier spinlock and 325 memory barrier operations. 326 327 If unsure, say n here. Even distro kernels should think twice before 328 enabling this: there are few systems, and an unlikely bug. 329 330config X86_F00F_BUG 331 def_bool y 332 depends on M586MMX || M586TSC || M586 || M486 333 334config X86_INVD_BUG 335 def_bool y 336 depends on M486 337 338config X86_ALIGNMENT_16 339 def_bool y 340 depends on MWINCHIP3D || MWINCHIPC6 || MCYRIXIII || MELAN || MK6 || M586MMX || M586TSC || M586 || M486 || MVIAC3_2 || MGEODEGX1 341 342config X86_INTEL_USERCOPY 343 def_bool y 344 depends on MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M586MMX || X86_GENERIC || MK8 || MK7 || MEFFICEON || MCORE2 345 346config X86_USE_PPRO_CHECKSUM 347 def_bool y 348 depends on MWINCHIP3D || MWINCHIPC6 || MCYRIXIII || MK7 || MK6 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || MK8 || MVIAC3_2 || MVIAC7 || MEFFICEON || MGEODE_LX || MCORE2 || MATOM 349 350config X86_USE_3DNOW 351 def_bool y 352 depends on (MCYRIXIII || MK7 || MGEODE_LX) && !UML 353 354# 355# P6_NOPs are a relatively minor optimization that require a family >= 356# 6 processor, except that it is broken on certain VIA chips. 357# Furthermore, AMD chips prefer a totally different sequence of NOPs 358# (which work on all CPUs). In addition, it looks like Virtual PC 359# does not understand them. 360# 361# As a result, disallow these if we're not compiling for X86_64 (these 362# NOPs do work on all x86-64 capable chips); the list of processors in 363# the right-hand clause are the cores that benefit from this optimization. 364# 365config X86_P6_NOP 366 def_bool y 367 depends on X86_64 368 depends on (MCORE2 || MPENTIUM4 || MPSC) 369 370config X86_TSC 371 def_bool y 372 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_64 373 374config X86_CMPXCHG64 375 def_bool y 376 depends on X86_PAE || X86_64 || MCORE2 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || MATOM 377 378# this should be set for all -march=.. options where the compiler 379# generates cmov. 380config X86_CMOV 381 def_bool y 382 depends on (MK8 || MK7 || MCORE2 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || MVIAC3_2 || MVIAC7 || MCRUSOE || MEFFICEON || X86_64 || MATOM || MGEODE_LX) 383 384config X86_MINIMUM_CPU_FAMILY 385 int 386 default "64" if X86_64 387 default "6" if X86_32 && X86_P6_NOP 388 default "5" if X86_32 && X86_CMPXCHG64 389 default "4" 390 391config X86_DEBUGCTLMSR 392 def_bool y 393 depends on !(MK6 || MWINCHIPC6 || MWINCHIP3D || MCYRIXIII || M586MMX || M586TSC || M586 || M486) && !UML 394 395menuconfig PROCESSOR_SELECT 396 bool "Supported processor vendors" if EXPERT 397 ---help--- 398 This lets you choose what x86 vendor support code your kernel 399 will include. 400 401config CPU_SUP_INTEL 402 default y 403 bool "Support Intel processors" if PROCESSOR_SELECT 404 ---help--- 405 This enables detection, tunings and quirks for Intel processors 406 407 You need this enabled if you want your kernel to run on an 408 Intel CPU. Disabling this option on other types of CPUs 409 makes the kernel a tiny bit smaller. Disabling it on an Intel 410 CPU might render the kernel unbootable. 411 412 If unsure, say N. 413 414config CPU_SUP_CYRIX_32 415 default y 416 bool "Support Cyrix processors" if PROCESSOR_SELECT 417 depends on M486 || M586 || M586TSC || M586MMX || (EXPERT && !64BIT) 418 ---help--- 419 This enables detection, tunings and quirks for Cyrix processors 420 421 You need this enabled if you want your kernel to run on a 422 Cyrix CPU. Disabling this option on other types of CPUs 423 makes the kernel a tiny bit smaller. Disabling it on a Cyrix 424 CPU might render the kernel unbootable. 425 426 If unsure, say N. 427 428config CPU_SUP_AMD 429 default y 430 bool "Support AMD processors" if PROCESSOR_SELECT 431 ---help--- 432 This enables detection, tunings and quirks for AMD processors 433 434 You need this enabled if you want your kernel to run on an 435 AMD CPU. Disabling this option on other types of CPUs 436 makes the kernel a tiny bit smaller. Disabling it on an AMD 437 CPU might render the kernel unbootable. 438 439 If unsure, say N. 440 441config CPU_SUP_CENTAUR 442 default y 443 bool "Support Centaur processors" if PROCESSOR_SELECT 444 ---help--- 445 This enables detection, tunings and quirks for Centaur processors 446 447 You need this enabled if you want your kernel to run on a 448 Centaur CPU. Disabling this option on other types of CPUs 449 makes the kernel a tiny bit smaller. Disabling it on a Centaur 450 CPU might render the kernel unbootable. 451 452 If unsure, say N. 453 454config CPU_SUP_TRANSMETA_32 455 default y 456 bool "Support Transmeta processors" if PROCESSOR_SELECT 457 depends on !64BIT 458 ---help--- 459 This enables detection, tunings and quirks for Transmeta processors 460 461 You need this enabled if you want your kernel to run on a 462 Transmeta CPU. Disabling this option on other types of CPUs 463 makes the kernel a tiny bit smaller. Disabling it on a Transmeta 464 CPU might render the kernel unbootable. 465 466 If unsure, say N. 467 468config CPU_SUP_UMC_32 469 default y 470 bool "Support UMC processors" if PROCESSOR_SELECT 471 depends on M486 || (EXPERT && !64BIT) 472 ---help--- 473 This enables detection, tunings and quirks for UMC processors 474 475 You need this enabled if you want your kernel to run on a 476 UMC CPU. Disabling this option on other types of CPUs 477 makes the kernel a tiny bit smaller. Disabling it on a UMC 478 CPU might render the kernel unbootable. 479 480 If unsure, say N. 481