Root/arch/x86/Kconfig.cpu

1# Put here option for CPU selection and depending optimization
2if !X86_ELAN
3
4choice
5    prompt "Processor family"
6    default M686 if X86_32
7    default GENERIC_CPU if X86_64
8
9config 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
50config 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
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 MGEODEGX1
207    bool "GeodeGX1"
208    depends on X86_32
209    ---help---
210      Select this for a Geode GX1 (Cyrix MediaGX) chip.
211
212config 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
218config 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
230config 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
238config 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
245config 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
256config 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
265config 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
274config 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
281endchoice
282
283config 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
295endif
296
297config 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
304config X86_INTERNODE_CACHE_SHIFT
305    int
306    default "12" if X86_VSMP
307    default "7" if NUMA
308    default X86_L1_CACHE_SHIFT
309
310config X86_CMPXCHG
311    def_bool X86_64 || (X86_32 && !M386)
312
313config X86_L1_CACHE_SHIFT
314    int
315    default "7" if MPENTIUM4 || MPSC
316    default "6" if MK7 || MK8 || MPENTIUMM || MCORE2 || MATOM || MVIAC7 || X86_GENERIC || GENERIC_CPU
317    default "4" if X86_ELAN || M486 || M386 || MGEODEGX1
318    default "5" if MWINCHIP3D || MWINCHIPC6 || MCRUSOE || MEFFICEON || MCYRIXIII || MK6 || MPENTIUMIII || MPENTIUMII || M686 || M586MMX || M586TSC || M586 || MVIAC3_2 || MGEODE_LX
319
320config X86_XADD
321    def_bool y
322    depends on X86_64 || !M386
323
324config X86_PPRO_FENCE
325    bool "PentiumPro memory ordering errata workaround"
326    depends on M686 || M586MMX || M586TSC || M586 || M486 || M386 || MGEODEGX1
327    ---help---
328      Old PentiumPro multiprocessor systems had errata that could cause
329      memory operations to violate the x86 ordering standard in rare cases.
330      Enabling this option will attempt to work around some (but not all)
331      occurances of this problem, at the cost of much heavier spinlock and
332      memory barrier operations.
333
334      If unsure, say n here. Even distro kernels should think twice before
335      enabling this: there are few systems, and an unlikely bug.
336
337config X86_F00F_BUG
338    def_bool y
339    depends on M586MMX || M586TSC || M586 || M486 || M386
340
341config X86_INVD_BUG
342    def_bool y
343    depends on M486 || M386
344
345config X86_WP_WORKS_OK
346    def_bool y
347    depends on !M386
348
349config X86_INVLPG
350    def_bool y
351    depends on X86_32 && !M386
352
353config X86_BSWAP
354    def_bool y
355    depends on X86_32 && !M386
356
357config X86_POPAD_OK
358    def_bool y
359    depends on X86_32 && !M386
360
361config X86_ALIGNMENT_16
362    def_bool y
363    depends on MWINCHIP3D || MWINCHIPC6 || MCYRIXIII || X86_ELAN || MK6 || M586MMX || M586TSC || M586 || M486 || MVIAC3_2 || MGEODEGX1
364
365config X86_INTEL_USERCOPY
366    def_bool y
367    depends on MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M586MMX || X86_GENERIC || MK8 || MK7 || MEFFICEON || MCORE2
368
369config X86_USE_PPRO_CHECKSUM
370    def_bool y
371    depends on MWINCHIP3D || MWINCHIPC6 || MCYRIXIII || MK7 || MK6 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || MK8 || MVIAC3_2 || MEFFICEON || MGEODE_LX || MCORE2 || MATOM
372
373config X86_USE_3DNOW
374    def_bool y
375    depends on (MCYRIXIII || MK7 || MGEODE_LX) && !UML
376
377config X86_OOSTORE
378    def_bool y
379    depends on (MWINCHIP3D || MWINCHIPC6) && MTRR
380
381#
382# P6_NOPs are a relatively minor optimization that require a family >=
383# 6 processor, except that it is broken on certain VIA chips.
384# Furthermore, AMD chips prefer a totally different sequence of NOPs
385# (which work on all CPUs). In addition, it looks like Virtual PC
386# does not understand them.
387#
388# As a result, disallow these if we're not compiling for X86_64 (these
389# NOPs do work on all x86-64 capable chips); the list of processors in
390# the right-hand clause are the cores that benefit from this optimization.
391#
392config X86_P6_NOP
393    def_bool y
394    depends on X86_64
395    depends on (MCORE2 || MPENTIUM4 || MPSC)
396
397config X86_TSC
398    def_bool y
399    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
400
401config X86_CMPXCHG64
402    def_bool y
403    depends on X86_PAE || X86_64 || MCORE2 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || MATOM
404
405# this should be set for all -march=.. options where the compiler
406# generates cmov.
407config X86_CMOV
408    def_bool y
409    depends on (MK8 || MK7 || MCORE2 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || MVIAC3_2 || MVIAC7 || MCRUSOE || MEFFICEON || X86_64 || MATOM || MGEODE_LX)
410
411config X86_MINIMUM_CPU_FAMILY
412    int
413    default "64" if X86_64
414    default "6" if X86_32 && X86_P6_NOP
415    default "5" if X86_32 && X86_CMPXCHG64
416    default "4" if X86_32 && (X86_XADD || X86_CMPXCHG || X86_BSWAP || X86_WP_WORKS_OK)
417    default "3"
418
419config X86_DEBUGCTLMSR
420    def_bool y
421    depends on !(MK6 || MWINCHIPC6 || MWINCHIP3D || MCYRIXIII || M586MMX || M586TSC || M586 || M486 || M386) && !UML
422
423menuconfig PROCESSOR_SELECT
424    bool "Supported processor vendors" if EMBEDDED
425    ---help---
426      This lets you choose what x86 vendor support code your kernel
427      will include.
428
429config CPU_SUP_INTEL
430    default y
431    bool "Support Intel processors" if PROCESSOR_SELECT
432    ---help---
433      This enables detection, tunings and quirks for Intel processors
434
435      You need this enabled if you want your kernel to run on an
436      Intel CPU. Disabling this option on other types of CPUs
437      makes the kernel a tiny bit smaller. Disabling it on an Intel
438      CPU might render the kernel unbootable.
439
440      If unsure, say N.
441
442config CPU_SUP_CYRIX_32
443    default y
444    bool "Support Cyrix processors" if PROCESSOR_SELECT
445    depends on !64BIT
446    ---help---
447      This enables detection, tunings and quirks for Cyrix processors
448
449      You need this enabled if you want your kernel to run on a
450      Cyrix CPU. Disabling this option on other types of CPUs
451      makes the kernel a tiny bit smaller. Disabling it on a Cyrix
452      CPU might render the kernel unbootable.
453
454      If unsure, say N.
455
456config CPU_SUP_AMD
457    default y
458    bool "Support AMD processors" if PROCESSOR_SELECT
459    ---help---
460      This enables detection, tunings and quirks for AMD processors
461
462      You need this enabled if you want your kernel to run on an
463      AMD CPU. Disabling this option on other types of CPUs
464      makes the kernel a tiny bit smaller. Disabling it on an AMD
465      CPU might render the kernel unbootable.
466
467      If unsure, say N.
468
469config CPU_SUP_CENTAUR
470    default y
471    bool "Support Centaur processors" if PROCESSOR_SELECT
472    ---help---
473      This enables detection, tunings and quirks for Centaur processors
474
475      You need this enabled if you want your kernel to run on a
476      Centaur CPU. Disabling this option on other types of CPUs
477      makes the kernel a tiny bit smaller. Disabling it on a Centaur
478      CPU might render the kernel unbootable.
479
480      If unsure, say N.
481
482config CPU_SUP_TRANSMETA_32
483    default y
484    bool "Support Transmeta processors" if PROCESSOR_SELECT
485    depends on !64BIT
486    ---help---
487      This enables detection, tunings and quirks for Transmeta processors
488
489      You need this enabled if you want your kernel to run on a
490      Transmeta CPU. Disabling this option on other types of CPUs
491      makes the kernel a tiny bit smaller. Disabling it on a Transmeta
492      CPU might render the kernel unbootable.
493
494      If unsure, say N.
495
496config CPU_SUP_UMC_32
497    default y
498    bool "Support UMC processors" if PROCESSOR_SELECT
499    depends on !64BIT
500    ---help---
501      This enables detection, tunings and quirks for UMC processors
502
503      You need this enabled if you want your kernel to run on a
504      UMC CPU. Disabling this option on other types of CPUs
505      makes the kernel a tiny bit smaller. Disabling it on a UMC
506      CPU might render the kernel unbootable.
507
508      If unsure, say N.
509

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