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Linux/arch/x86/Kconfig.cpu

  1 # Put here option for CPU selection and depending optimization
  2 choice
  3         prompt "Processor family"
  4         default M686 if X86_32
  5         default GENERIC_CPU if X86_64
  6 
  7 config M486
  8         bool "486"
  9         depends on X86_32
 10         ---help---
 11           This is the processor type of your CPU. This information is
 12           used for optimizing purposes. In order to compile a kernel
 13           that can run on all supported x86 CPU types (albeit not
 14           optimally fast), you can specify "486" here.
 15 
 16           Note that the 386 is no longer supported, this includes
 17           AMD/Cyrix/Intel 386DX/DXL/SL/SLC/SX, Cyrix/TI 486DLC/DLC2,
 18           UMC 486SX-S and the NexGen Nx586.
 19 
 20           The kernel will not necessarily run on earlier architectures than
 21           the one you have chosen, e.g. a Pentium optimized kernel will run on
 22           a PPro, but not necessarily on a i486.
 23 
 24           Here are the settings recommended for greatest speed:
 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 Winchips with 3dNow! capabilities.
 41           - "GeodeGX1" for Geode GX1 (Cyrix MediaGX).
 42           - "Geode GX/LX" For AMD Geode GX and LX processors.
 43           - "CyrixIII/VIA C3" for VIA Cyrix III or VIA C3.
 44           - "VIA C3-2" for VIA C3-2 "Nehemiah" (model 9 and above).
 45           - "VIA C7" for VIA C7.
 46 
 47           If you don't know what to do, choose "486".
 48 
 49 config M586
 50         bool "586/K5/5x86/6x86/6x86MX"
 51         depends on X86_32
 52         ---help---
 53           Select this for an 586 or 686 series processor such as the AMD K5,
 54           the Cyrix 5x86, 6x86 and 6x86MX.  This choice does not
 55           assume the RDTSC (Read Time Stamp Counter) instruction.
 56 
 57 config M586TSC
 58         bool "Pentium-Classic"
 59         depends on X86_32
 60         ---help---
 61           Select this for a Pentium Classic processor with the RDTSC (Read
 62           Time Stamp Counter) instruction for benchmarking.
 63 
 64 config M586MMX
 65         bool "Pentium-MMX"
 66         depends on X86_32
 67         ---help---
 68           Select this for a Pentium with the MMX graphics/multimedia
 69           extended instructions.
 70 
 71 config M686
 72         bool "Pentium-Pro"
 73         depends on X86_32
 74         ---help---
 75           Select this for Intel Pentium Pro chips.  This enables the use of
 76           Pentium Pro extended instructions, and disables the init-time guard
 77           against the f00f bug found in earlier Pentiums.
 78 
 79 config MPENTIUMII
 80         bool "Pentium-II/Celeron(pre-Coppermine)"
 81         depends on X86_32
 82         ---help---
 83           Select this for Intel chips based on the Pentium-II and
 84           pre-Coppermine Celeron core.  This option enables an unaligned
 85           copy optimization, compiles the kernel with optimization flags
 86           tailored for the chip, and applies any applicable Pentium Pro
 87           optimizations.
 88 
 89 config MPENTIUMIII
 90         bool "Pentium-III/Celeron(Coppermine)/Pentium-III Xeon"
 91         depends on X86_32
 92         ---help---
 93           Select this for Intel chips based on the Pentium-III and
 94           Celeron-Coppermine core.  This option enables use of some
 95           extended prefetch instructions in addition to the Pentium II
 96           extensions.
 97 
 98 config MPENTIUMM
 99         bool "Pentium M"
100         depends on X86_32
101         ---help---
102           Select this for Intel Pentium M (not Pentium-4 M)
103           notebook chips.
104 
105 config MPENTIUM4
106         bool "Pentium-4/Celeron(P4-based)/Pentium-4 M/older Xeon"
107         depends on X86_32
108         ---help---
109           Select this for Intel Pentium 4 chips.  This includes the
110           Pentium 4, Pentium D, P4-based Celeron and Xeon, and
111           Pentium-4 M (not Pentium M) chips.  This option enables compile
112           flags optimized for the chip, uses the correct cache line size, and
113           applies any applicable optimizations.
114 
115           CPUIDs: F[0-6][1-A] (in /proc/cpuinfo show = cpu family : 15 )
116 
117           Select this for:
118             Pentiums (Pentium 4, Pentium D, Celeron, Celeron D) corename:
119                 -Willamette
120                 -Northwood
121                 -Mobile Pentium 4
122                 -Mobile Pentium 4 M
123                 -Extreme Edition (Gallatin)
124                 -Prescott
125                 -Prescott 2M
126                 -Cedar Mill
127                 -Presler
128                 -Smithfiled
129             Xeons (Intel Xeon, Xeon MP, Xeon LV, Xeon MV) corename:
130                 -Foster
131                 -Prestonia
132                 -Gallatin
133                 -Nocona
134                 -Irwindale
135                 -Cranford
136                 -Potomac
137                 -Paxville
138                 -Dempsey
139 
140 
141 config MK6
142         bool "K6/K6-II/K6-III"
143         depends on X86_32
144         ---help---
145           Select this for an AMD K6-family processor.  Enables use of
146           some extended instructions, and passes appropriate optimization
147           flags to GCC.
148 
149 config MK7
150         bool "Athlon/Duron/K7"
151         depends on X86_32
152         ---help---
153           Select this for an AMD Athlon K7-family processor.  Enables use of
154           some extended instructions, and passes appropriate optimization
155           flags to GCC.
156 
157 config MK8
158         bool "Opteron/Athlon64/Hammer/K8"
159         ---help---
160           Select this for an AMD Opteron or Athlon64 Hammer-family processor.
161           Enables use of some extended instructions, and passes appropriate
162           optimization flags to GCC.
163 
164 config MCRUSOE
165         bool "Crusoe"
166         depends on X86_32
167         ---help---
168           Select this for a Transmeta Crusoe processor.  Treats the processor
169           like a 586 with TSC, and sets some GCC optimization flags (like a
170           Pentium Pro with no alignment requirements).
171 
172 config MEFFICEON
173         bool "Efficeon"
174         depends on X86_32
175         ---help---
176           Select this for a Transmeta Efficeon processor.
177 
178 config MWINCHIPC6
179         bool "Winchip-C6"
180         depends on X86_32
181         ---help---
182           Select this for an IDT Winchip C6 chip.  Linux and GCC
183           treat this chip as a 586TSC with some extended instructions
184           and alignment requirements.
185 
186 config MWINCHIP3D
187         bool "Winchip-2/Winchip-2A/Winchip-3"
188         depends on X86_32
189         ---help---
190           Select this for an IDT Winchip-2, 2A or 3.  Linux and GCC
191           treat this chip as a 586TSC with some extended instructions
192           and alignment requirements.  Also enable out of order memory
193           stores for this CPU, which can increase performance of some
194           operations.
195 
196 config MELAN
197         bool "AMD Elan"
198         depends on X86_32
199         ---help---
200           Select this for an AMD Elan processor.
201 
202           Do not use this option for K6/Athlon/Opteron processors!
203 
204 config MGEODEGX1
205         bool "GeodeGX1"
206         depends on X86_32
207         ---help---
208           Select this for a Geode GX1 (Cyrix MediaGX) chip.
209 
210 config MGEODE_LX
211         bool "Geode GX/LX"
212         depends on X86_32
213         ---help---
214           Select this for AMD Geode GX and LX processors.
215 
216 config MCYRIXIII
217         bool "CyrixIII/VIA-C3"
218         depends on X86_32
219         ---help---
220           Select this for a Cyrix III or C3 chip.  Presently Linux and GCC
221           treat this chip as a generic 586. Whilst the CPU is 686 class,
222           it lacks the cmov extension which gcc assumes is present when
223           generating 686 code.
224           Note that Nehemiah (Model 9) and above will not boot with this
225           kernel due to them lacking the 3DNow! instructions used in earlier
226           incarnations of the CPU.
227 
228 config MVIAC3_2
229         bool "VIA C3-2 (Nehemiah)"
230         depends on X86_32
231         ---help---
232           Select this for a VIA C3 "Nehemiah". Selecting this enables usage
233           of SSE and tells gcc to treat the CPU as a 686.
234           Note, this kernel will not boot on older (pre model 9) C3s.
235 
236 config MVIAC7
237         bool "VIA C7"
238         depends on X86_32
239         ---help---
240           Select this for a VIA C7.  Selecting this uses the correct cache
241           shift and tells gcc to treat the CPU as a 686.
242 
243 config MPSC
244         bool "Intel P4 / older Netburst based Xeon"
245         depends on X86_64
246         ---help---
247           Optimize for Intel Pentium 4, Pentium D and older Nocona/Dempsey
248           Xeon CPUs with Intel 64bit which is compatible with x86-64.
249           Note that the latest Xeons (Xeon 51xx and 53xx) are not based on the
250           Netburst core and shouldn't use this option. You can distinguish them
251           using the cpu family field
252           in /proc/cpuinfo. Family 15 is an older Xeon, Family 6 a newer one.
253 
254 config MCORE2
255         bool "Core 2/newer Xeon"
256         ---help---
257 
258           Select this for Intel Core 2 and newer Core 2 Xeons (Xeon 51xx and
259           53xx) CPUs. You can distinguish newer from older Xeons by the CPU
260           family in /proc/cpuinfo. Newer ones have 6 and older ones 15
261           (not a typo)
262 
263 config MATOM
264         bool "Intel Atom"
265         ---help---
266 
267           Select this for the Intel Atom platform. Intel Atom CPUs have an
268           in-order pipelining architecture and thus can benefit from
269           accordingly optimized code. Use a recent GCC with specific Atom
270           support in order to fully benefit from selecting this option.
271 
272 config GENERIC_CPU
273         bool "Generic-x86-64"
274         depends on X86_64
275         ---help---
276           Generic x86-64 CPU.
277           Run equally well on all x86-64 CPUs.
278 
279 endchoice
280 
281 config X86_GENERIC
282         bool "Generic x86 support"
283         depends on X86_32
284         ---help---
285           Instead of just including optimizations for the selected
286           x86 variant (e.g. PII, Crusoe or Athlon), include some more
287           generic optimizations as well. This will make the kernel
288           perform better on x86 CPUs other than that selected.
289 
290           This is really intended for distributors who need more
291           generic optimizations.
292 
293 #
294 # Define implied options from the CPU selection here
295 config X86_INTERNODE_CACHE_SHIFT
296         int
297         default "12" if X86_VSMP
298         default X86_L1_CACHE_SHIFT
299 
300 config X86_L1_CACHE_SHIFT
301         int
302         default "7" if MPENTIUM4 || MPSC
303         default "6" if MK7 || MK8 || MPENTIUMM || MCORE2 || MATOM || MVIAC7 || X86_GENERIC || GENERIC_CPU
304         default "4" if MELAN || M486 || MGEODEGX1
305         default "5" if MWINCHIP3D || MWINCHIPC6 || MCRUSOE || MEFFICEON || MCYRIXIII || MK6 || MPENTIUMIII || MPENTIUMII || M686 || M586MMX || M586TSC || M586 || MVIAC3_2 || MGEODE_LX
306 
307 config X86_PPRO_FENCE
308         bool "PentiumPro memory ordering errata workaround"
309         depends on M686 || M586MMX || M586TSC || M586 || M486 || MGEODEGX1
310         ---help---
311           Old PentiumPro multiprocessor systems had errata that could cause
312           memory operations to violate the x86 ordering standard in rare cases.
313           Enabling this option will attempt to work around some (but not all)
314           occurrences of this problem, at the cost of much heavier spinlock and
315           memory barrier operations.
316 
317           If unsure, say n here. Even distro kernels should think twice before
318           enabling this: there are few systems, and an unlikely bug.
319 
320 config X86_F00F_BUG
321         def_bool y
322         depends on M586MMX || M586TSC || M586 || M486
323 
324 config X86_INVD_BUG
325         def_bool y
326         depends on M486
327 
328 config X86_ALIGNMENT_16
329         def_bool y
330         depends on MWINCHIP3D || MWINCHIPC6 || MCYRIXIII || MELAN || MK6 || M586MMX || M586TSC || M586 || M486 || MVIAC3_2 || MGEODEGX1
331 
332 config X86_INTEL_USERCOPY
333         def_bool y
334         depends on MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M586MMX || X86_GENERIC || MK8 || MK7 || MEFFICEON || MCORE2
335 
336 config X86_USE_PPRO_CHECKSUM
337         def_bool y
338         depends on MWINCHIP3D || MWINCHIPC6 || MCYRIXIII || MK7 || MK6 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || MK8 || MVIAC3_2 || MVIAC7 || MEFFICEON || MGEODE_LX || MCORE2 || MATOM
339 
340 config X86_USE_3DNOW
341         def_bool y
342         depends on (MCYRIXIII || MK7 || MGEODE_LX) && !UML
343 
344 #
345 # P6_NOPs are a relatively minor optimization that require a family >=
346 # 6 processor, except that it is broken on certain VIA chips.
347 # Furthermore, AMD chips prefer a totally different sequence of NOPs
348 # (which work on all CPUs).  In addition, it looks like Virtual PC
349 # does not understand them.
350 #
351 # As a result, disallow these if we're not compiling for X86_64 (these
352 # NOPs do work on all x86-64 capable chips); the list of processors in
353 # the right-hand clause are the cores that benefit from this optimization.
354 #
355 config X86_P6_NOP
356         def_bool y
357         depends on X86_64
358         depends on (MCORE2 || MPENTIUM4 || MPSC)
359 
360 config X86_TSC
361         def_bool y
362         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
363 
364 config X86_CMPXCHG64
365         def_bool y
366         depends on X86_PAE || X86_64 || MCORE2 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || MATOM
367 
368 # this should be set for all -march=.. options where the compiler
369 # generates cmov.
370 config X86_CMOV
371         def_bool y
372         depends on (MK8 || MK7 || MCORE2 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || MVIAC3_2 || MVIAC7 || MCRUSOE || MEFFICEON || X86_64 || MATOM || MGEODE_LX)
373 
374 config X86_MINIMUM_CPU_FAMILY
375         int
376         default "64" if X86_64
377         default "6" if X86_32 && X86_P6_NOP
378         default "5" if X86_32 && X86_CMPXCHG64
379         default "4"
380 
381 config X86_DEBUGCTLMSR
382         def_bool y
383         depends on !(MK6 || MWINCHIPC6 || MWINCHIP3D || MCYRIXIII || M586MMX || M586TSC || M586 || M486) && !UML
384 
385 menuconfig PROCESSOR_SELECT
386         bool "Supported processor vendors" if EXPERT
387         ---help---
388           This lets you choose what x86 vendor support code your kernel
389           will include.
390 
391 config CPU_SUP_INTEL
392         default y
393         bool "Support Intel processors" if PROCESSOR_SELECT
394         ---help---
395           This enables detection, tunings and quirks for Intel processors
396 
397           You need this enabled if you want your kernel to run on an
398           Intel CPU. Disabling this option on other types of CPUs
399           makes the kernel a tiny bit smaller. Disabling it on an Intel
400           CPU might render the kernel unbootable.
401 
402           If unsure, say N.
403 
404 config CPU_SUP_CYRIX_32
405         default y
406         bool "Support Cyrix processors" if PROCESSOR_SELECT
407         depends on M486 || M586 || M586TSC || M586MMX || (EXPERT && !64BIT)
408         ---help---
409           This enables detection, tunings and quirks for Cyrix processors
410 
411           You need this enabled if you want your kernel to run on a
412           Cyrix CPU. Disabling this option on other types of CPUs
413           makes the kernel a tiny bit smaller. Disabling it on a Cyrix
414           CPU might render the kernel unbootable.
415 
416           If unsure, say N.
417 
418 config CPU_SUP_AMD
419         default y
420         bool "Support AMD processors" if PROCESSOR_SELECT
421         ---help---
422           This enables detection, tunings and quirks for AMD processors
423 
424           You need this enabled if you want your kernel to run on an
425           AMD CPU. Disabling this option on other types of CPUs
426           makes the kernel a tiny bit smaller. Disabling it on an AMD
427           CPU might render the kernel unbootable.
428 
429           If unsure, say N.
430 
431 config CPU_SUP_CENTAUR
432         default y
433         bool "Support Centaur processors" if PROCESSOR_SELECT
434         ---help---
435           This enables detection, tunings and quirks for Centaur processors
436 
437           You need this enabled if you want your kernel to run on a
438           Centaur CPU. Disabling this option on other types of CPUs
439           makes the kernel a tiny bit smaller. Disabling it on a Centaur
440           CPU might render the kernel unbootable.
441 
442           If unsure, say N.
443 
444 config CPU_SUP_TRANSMETA_32
445         default y
446         bool "Support Transmeta processors" if PROCESSOR_SELECT
447         depends on !64BIT
448         ---help---
449           This enables detection, tunings and quirks for Transmeta processors
450 
451           You need this enabled if you want your kernel to run on a
452           Transmeta CPU. Disabling this option on other types of CPUs
453           makes the kernel a tiny bit smaller. Disabling it on a Transmeta
454           CPU might render the kernel unbootable.
455 
456           If unsure, say N.
457 
458 config CPU_SUP_UMC_32
459         default y
460         bool "Support UMC processors" if PROCESSOR_SELECT
461         depends on M486 || (EXPERT && !64BIT)
462         ---help---
463           This enables detection, tunings and quirks for UMC processors
464 
465           You need this enabled if you want your kernel to run on a
466           UMC CPU. Disabling this option on other types of CPUs
467           makes the kernel a tiny bit smaller. Disabling it on a UMC
468           CPU might render the kernel unbootable.
469 
470           If unsure, say N.

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