xref: /openbmc/linux/arch/x86/Kconfig.cpu (revision 132db935) 
1# SPDX-License-Identifier: GPL-2.0
2# Put here option for CPU selection and depending optimization
3choice
4	prompt "Processor family"
5	default M686 if X86_32
6	default GENERIC_CPU if X86_64
7	help
8	  This is the processor type of your CPU. This information is
9	  used for optimizing purposes. In order to compile a kernel
10	  that can run on all supported x86 CPU types (albeit not
11	  optimally fast), you can specify "486" here.
12
13	  Note that the 386 is no longer supported, this includes
14	  AMD/Cyrix/Intel 386DX/DXL/SL/SLC/SX, Cyrix/TI 486DLC/DLC2,
15	  UMC 486SX-S and the NexGen Nx586.
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	  - "486" for the AMD/Cyrix/IBM/Intel 486DX/DX2/DX4 or
23	    SL/SLC/SLC2/SLC3/SX/SX2 and UMC U5D or U5S.
24	  - "586" for generic Pentium CPUs lacking the TSC
25	    (time stamp counter) register.
26	  - "Pentium-Classic" for the Intel Pentium.
27	  - "Pentium-MMX" for the Intel Pentium MMX.
28	  - "Pentium-Pro" for the Intel Pentium Pro.
29	  - "Pentium-II" for the Intel Pentium II or pre-Coppermine Celeron.
30	  - "Pentium-III" for the Intel Pentium III or Coppermine Celeron.
31	  - "Pentium-4" for the Intel Pentium 4 or P4-based Celeron.
32	  - "K6" for the AMD K6, K6-II and K6-III (aka K6-3D).
33	  - "Athlon" for the AMD K7 family (Athlon/Duron/Thunderbird).
34	  - "Opteron/Athlon64/Hammer/K8" for all K8 and newer AMD CPUs.
35	  - "Crusoe" for the Transmeta Crusoe series.
36	  - "Efficeon" for the Transmeta Efficeon series.
37	  - "Winchip-C6" for original IDT Winchip.
38	  - "Winchip-2" for IDT Winchips with 3dNow! capabilities.
39	  - "AMD Elan" for the 32-bit AMD Elan embedded CPU.
40	  - "GeodeGX1" for Geode GX1 (Cyrix MediaGX).
41	  - "Geode GX/LX" For AMD Geode GX and LX processors.
42	  - "CyrixIII/VIA C3" for VIA Cyrix III or VIA C3.
43	  - "VIA C3-2" for VIA C3-2 "Nehemiah" (model 9 and above).
44	  - "VIA C7" for VIA C7.
45	  - "Intel P4" for the Pentium 4/Netburst microarchitecture.
46	  - "Core 2/newer Xeon" for all core2 and newer Intel CPUs.
47	  - "Intel Atom" for the Atom-microarchitecture CPUs.
48	  - "Generic-x86-64" for a kernel which runs on any x86-64 CPU.
49
50	  See each option's help text for additional details. If you don't know
51	  what to do, choose "486".
52
53config M486SX
54	bool "486SX"
55	depends on X86_32
56	help
57	  Select this for an 486-class CPU without an FPU such as
58	  AMD/Cyrix/IBM/Intel SL/SLC/SLC2/SLC3/SX/SX2 and UMC U5S.
59
60config M486
61	bool "486DX"
62	depends on X86_32
63	help
64	  Select this for an 486-class CPU such as AMD/Cyrix/IBM/Intel
65	  486DX/DX2/DX4 and UMC U5D.
66
67config M586
68	bool "586/K5/5x86/6x86/6x86MX"
69	depends on X86_32
70	help
71	  Select this for an 586 or 686 series processor such as the AMD K5,
72	  the Cyrix 5x86, 6x86 and 6x86MX.  This choice does not
73	  assume the RDTSC (Read Time Stamp Counter) instruction.
74
75config M586TSC
76	bool "Pentium-Classic"
77	depends on X86_32
78	help
79	  Select this for a Pentium Classic processor with the RDTSC (Read
80	  Time Stamp Counter) instruction for benchmarking.
81
82config M586MMX
83	bool "Pentium-MMX"
84	depends on X86_32
85	help
86	  Select this for a Pentium with the MMX graphics/multimedia
87	  extended instructions.
88
89config M686
90	bool "Pentium-Pro"
91	depends on X86_32
92	help
93	  Select this for Intel Pentium Pro chips.  This enables the use of
94	  Pentium Pro extended instructions, and disables the init-time guard
95	  against the f00f bug found in earlier Pentiums.
96
97config MPENTIUMII
98	bool "Pentium-II/Celeron(pre-Coppermine)"
99	depends on X86_32
100	help
101	  Select this for Intel chips based on the Pentium-II and
102	  pre-Coppermine Celeron core.  This option enables an unaligned
103	  copy optimization, compiles the kernel with optimization flags
104	  tailored for the chip, and applies any applicable Pentium Pro
105	  optimizations.
106
107config MPENTIUMIII
108	bool "Pentium-III/Celeron(Coppermine)/Pentium-III Xeon"
109	depends on X86_32
110	help
111	  Select this for Intel chips based on the Pentium-III and
112	  Celeron-Coppermine core.  This option enables use of some
113	  extended prefetch instructions in addition to the Pentium II
114	  extensions.
115
116config MPENTIUMM
117	bool "Pentium M"
118	depends on X86_32
119	help
120	  Select this for Intel Pentium M (not Pentium-4 M)
121	  notebook chips.
122
123config MPENTIUM4
124	bool "Pentium-4/Celeron(P4-based)/Pentium-4 M/older Xeon"
125	depends on X86_32
126	help
127	  Select this for Intel Pentium 4 chips.  This includes the
128	  Pentium 4, Pentium D, P4-based Celeron and Xeon, and
129	  Pentium-4 M (not Pentium M) chips.  This option enables compile
130	  flags optimized for the chip, uses the correct cache line size, and
131	  applies any applicable optimizations.
132
133	  CPUIDs: F[0-6][1-A] (in /proc/cpuinfo show = cpu family : 15 )
134
135	  Select this for:
136	    Pentiums (Pentium 4, Pentium D, Celeron, Celeron D) corename:
137		-Willamette
138		-Northwood
139		-Mobile Pentium 4
140		-Mobile Pentium 4 M
141		-Extreme Edition (Gallatin)
142		-Prescott
143		-Prescott 2M
144		-Cedar Mill
145		-Presler
146		-Smithfiled
147	    Xeons (Intel Xeon, Xeon MP, Xeon LV, Xeon MV) corename:
148		-Foster
149		-Prestonia
150		-Gallatin
151		-Nocona
152		-Irwindale
153		-Cranford
154		-Potomac
155		-Paxville
156		-Dempsey
157
158
159config MK6
160	bool "K6/K6-II/K6-III"
161	depends on X86_32
162	help
163	  Select this for an AMD K6-family processor.  Enables use of
164	  some extended instructions, and passes appropriate optimization
165	  flags to GCC.
166
167config MK7
168	bool "Athlon/Duron/K7"
169	depends on X86_32
170	help
171	  Select this for an AMD Athlon K7-family processor.  Enables use of
172	  some extended instructions, and passes appropriate optimization
173	  flags to GCC.
174
175config MK8
176	bool "Opteron/Athlon64/Hammer/K8"
177	help
178	  Select this for an AMD Opteron or Athlon64 Hammer-family processor.
179	  Enables use of some extended instructions, and passes appropriate
180	  optimization flags to GCC.
181
182config MCRUSOE
183	bool "Crusoe"
184	depends on X86_32
185	help
186	  Select this for a Transmeta Crusoe processor.  Treats the processor
187	  like a 586 with TSC, and sets some GCC optimization flags (like a
188	  Pentium Pro with no alignment requirements).
189
190config MEFFICEON
191	bool "Efficeon"
192	depends on X86_32
193	help
194	  Select this for a Transmeta Efficeon processor.
195
196config MWINCHIPC6
197	bool "Winchip-C6"
198	depends on X86_32
199	help
200	  Select this for an IDT Winchip C6 chip.  Linux and GCC
201	  treat this chip as a 586TSC with some extended instructions
202	  and alignment requirements.
203
204config MWINCHIP3D
205	bool "Winchip-2/Winchip-2A/Winchip-3"
206	depends on X86_32
207	help
208	  Select this for an IDT Winchip-2, 2A or 3.  Linux and GCC
209	  treat this chip as a 586TSC with some extended instructions
210	  and alignment requirements.  Also enable out of order memory
211	  stores for this CPU, which can increase performance of some
212	  operations.
213
214config MELAN
215	bool "AMD Elan"
216	depends on X86_32
217	help
218	  Select this for an AMD Elan processor.
219
220	  Do not use this option for K6/Athlon/Opteron processors!
221
222config MGEODEGX1
223	bool "GeodeGX1"
224	depends on X86_32
225	help
226	  Select this for a Geode GX1 (Cyrix MediaGX) chip.
227
228config MGEODE_LX
229	bool "Geode GX/LX"
230	depends on X86_32
231	help
232	  Select this for AMD Geode GX and LX processors.
233
234config MCYRIXIII
235	bool "CyrixIII/VIA-C3"
236	depends on X86_32
237	help
238	  Select this for a Cyrix III or C3 chip.  Presently Linux and GCC
239	  treat this chip as a generic 586. Whilst the CPU is 686 class,
240	  it lacks the cmov extension which gcc assumes is present when
241	  generating 686 code.
242	  Note that Nehemiah (Model 9) and above will not boot with this
243	  kernel due to them lacking the 3DNow! instructions used in earlier
244	  incarnations of the CPU.
245
246config MVIAC3_2
247	bool "VIA C3-2 (Nehemiah)"
248	depends on X86_32
249	help
250	  Select this for a VIA C3 "Nehemiah". Selecting this enables usage
251	  of SSE and tells gcc to treat the CPU as a 686.
252	  Note, this kernel will not boot on older (pre model 9) C3s.
253
254config MVIAC7
255	bool "VIA C7"
256	depends on X86_32
257	help
258	  Select this for a VIA C7.  Selecting this uses the correct cache
259	  shift and tells gcc to treat the CPU as a 686.
260
261config MPSC
262	bool "Intel P4 / older Netburst based Xeon"
263	depends on X86_64
264	help
265	  Optimize for Intel Pentium 4, Pentium D and older Nocona/Dempsey
266	  Xeon CPUs with Intel 64bit which is compatible with x86-64.
267	  Note that the latest Xeons (Xeon 51xx and 53xx) are not based on the
268	  Netburst core and shouldn't use this option. You can distinguish them
269	  using the cpu family field
270	  in /proc/cpuinfo. Family 15 is an older Xeon, Family 6 a newer one.
271
272config MCORE2
273	bool "Core 2/newer Xeon"
274	help
275
276	  Select this for Intel Core 2 and newer Core 2 Xeons (Xeon 51xx and
277	  53xx) CPUs. You can distinguish newer from older Xeons by the CPU
278	  family in /proc/cpuinfo. Newer ones have 6 and older ones 15
279	  (not a typo)
280
281config MATOM
282	bool "Intel Atom"
283	help
284
285	  Select this for the Intel Atom platform. Intel Atom CPUs have an
286	  in-order pipelining architecture and thus can benefit from
287	  accordingly optimized code. Use a recent GCC with specific Atom
288	  support in order to fully benefit from selecting this option.
289
290config GENERIC_CPU
291	bool "Generic-x86-64"
292	depends on X86_64
293	help
294	  Generic x86-64 CPU.
295	  Run equally well on all x86-64 CPUs.
296
297endchoice
298
299config X86_GENERIC
300	bool "Generic x86 support"
301	depends on X86_32
302	help
303	  Instead of just including optimizations for the selected
304	  x86 variant (e.g. PII, Crusoe or Athlon), include some more
305	  generic optimizations as well. This will make the kernel
306	  perform better on x86 CPUs other than that selected.
307
308	  This is really intended for distributors who need more
309	  generic optimizations.
310
311#
312# Define implied options from the CPU selection here
313config X86_INTERNODE_CACHE_SHIFT
314	int
315	default "12" if X86_VSMP
316	default X86_L1_CACHE_SHIFT
317
318config X86_L1_CACHE_SHIFT
319	int
320	default "7" if MPENTIUM4 || MPSC
321	default "6" if MK7 || MK8 || MPENTIUMM || MCORE2 || MATOM || MVIAC7 || X86_GENERIC || GENERIC_CPU
322	default "4" if MELAN || M486SX || M486 || MGEODEGX1
323	default "5" if MWINCHIP3D || MWINCHIPC6 || MCRUSOE || MEFFICEON || MCYRIXIII || MK6 || MPENTIUMIII || MPENTIUMII || M686 || M586MMX || M586TSC || M586 || MVIAC3_2 || MGEODE_LX
324
325config X86_F00F_BUG
326	def_bool y
327	depends on M586MMX || M586TSC || M586 || M486SX || M486
328
329config X86_INVD_BUG
330	def_bool y
331	depends on M486SX || M486
332
333config X86_ALIGNMENT_16
334	def_bool y
335	depends on MWINCHIP3D || MWINCHIPC6 || MCYRIXIII || MELAN || MK6 || M586MMX || M586TSC || M586 || M486SX || M486 || MVIAC3_2 || MGEODEGX1
336
337config X86_INTEL_USERCOPY
338	def_bool y
339	depends on MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M586MMX || X86_GENERIC || MK8 || MK7 || MEFFICEON || MCORE2
340
341config X86_USE_PPRO_CHECKSUM
342	def_bool y
343	depends on MWINCHIP3D || MWINCHIPC6 || MCYRIXIII || MK7 || MK6 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || MK8 || MVIAC3_2 || MVIAC7 || MEFFICEON || MGEODE_LX || MCORE2 || MATOM
344
345config X86_USE_3DNOW
346	def_bool y
347	depends on (MCYRIXIII || MK7 || MGEODE_LX) && !UML
348
349#
350# P6_NOPs are a relatively minor optimization that require a family >=
351# 6 processor, except that it is broken on certain VIA chips.
352# Furthermore, AMD chips prefer a totally different sequence of NOPs
353# (which work on all CPUs).  In addition, it looks like Virtual PC
354# does not understand them.
355#
356# As a result, disallow these if we're not compiling for X86_64 (these
357# NOPs do work on all x86-64 capable chips); the list of processors in
358# the right-hand clause are the cores that benefit from this optimization.
359#
360config X86_P6_NOP
361	def_bool y
362	depends on X86_64
363	depends on (MCORE2 || MPENTIUM4 || MPSC)
364
365config X86_TSC
366	def_bool y
367	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
368
369config X86_CMPXCHG64
370	def_bool y
371	depends on X86_PAE || X86_64 || MCORE2 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || M586TSC || M586MMX || MATOM || MGEODE_LX || MGEODEGX1 || MK6 || MK7 || MK8
372
373# this should be set for all -march=.. options where the compiler
374# generates cmov.
375config X86_CMOV
376	def_bool y
377	depends on (MK8 || MK7 || MCORE2 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || MVIAC3_2 || MVIAC7 || MCRUSOE || MEFFICEON || X86_64 || MATOM || MGEODE_LX)
378
379config X86_MINIMUM_CPU_FAMILY
380	int
381	default "64" if X86_64
382	default "6" if X86_32 && (MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || MVIAC3_2 || MVIAC7 || MEFFICEON || MATOM || MCRUSOE || MCORE2 || MK7 || MK8)
383	default "5" if X86_32 && X86_CMPXCHG64
384	default "4"
385
386config X86_DEBUGCTLMSR
387	def_bool y
388	depends on !(MK6 || MWINCHIPC6 || MWINCHIP3D || MCYRIXIII || M586MMX || M586TSC || M586 || M486SX || M486) && !UML
389
390config IA32_FEAT_CTL
391	def_bool y
392	depends on CPU_SUP_INTEL || CPU_SUP_CENTAUR || CPU_SUP_ZHAOXIN
393
394config X86_VMX_FEATURE_NAMES
395	def_bool y
396	depends on IA32_FEAT_CTL && X86_FEATURE_NAMES
397
398menuconfig PROCESSOR_SELECT
399	bool "Supported processor vendors" if EXPERT
400	help
401	  This lets you choose what x86 vendor support code your kernel
402	  will include.
403
404config CPU_SUP_INTEL
405	default y
406	bool "Support Intel processors" if PROCESSOR_SELECT
407	help
408	  This enables detection, tunings and quirks for Intel processors
409
410	  You need this enabled if you want your kernel to run on an
411	  Intel CPU. Disabling this option on other types of CPUs
412	  makes the kernel a tiny bit smaller. Disabling it on an Intel
413	  CPU might render the kernel unbootable.
414
415	  If unsure, say N.
416
417config CPU_SUP_CYRIX_32
418	default y
419	bool "Support Cyrix processors" if PROCESSOR_SELECT
420	depends on M486SX || M486 || M586 || M586TSC || M586MMX || (EXPERT && !64BIT)
421	help
422	  This enables detection, tunings and quirks for Cyrix processors
423
424	  You need this enabled if you want your kernel to run on a
425	  Cyrix CPU. Disabling this option on other types of CPUs
426	  makes the kernel a tiny bit smaller. Disabling it on a Cyrix
427	  CPU might render the kernel unbootable.
428
429	  If unsure, say N.
430
431config CPU_SUP_AMD
432	default y
433	bool "Support AMD processors" if PROCESSOR_SELECT
434	help
435	  This enables detection, tunings and quirks for AMD processors
436
437	  You need this enabled if you want your kernel to run on an
438	  AMD CPU. Disabling this option on other types of CPUs
439	  makes the kernel a tiny bit smaller. Disabling it on an AMD
440	  CPU might render the kernel unbootable.
441
442	  If unsure, say N.
443
444config CPU_SUP_HYGON
445	default y
446	bool "Support Hygon processors" if PROCESSOR_SELECT
447	select CPU_SUP_AMD
448	help
449	  This enables detection, tunings and quirks for Hygon processors
450
451	  You need this enabled if you want your kernel to run on an
452	  Hygon CPU. Disabling this option on other types of CPUs
453	  makes the kernel a tiny bit smaller. Disabling it on an Hygon
454	  CPU might render the kernel unbootable.
455
456	  If unsure, say N.
457
458config CPU_SUP_CENTAUR
459	default y
460	bool "Support Centaur processors" if PROCESSOR_SELECT
461	help
462	  This enables detection, tunings and quirks for Centaur processors
463
464	  You need this enabled if you want your kernel to run on a
465	  Centaur CPU. Disabling this option on other types of CPUs
466	  makes the kernel a tiny bit smaller. Disabling it on a Centaur
467	  CPU might render the kernel unbootable.
468
469	  If unsure, say N.
470
471config CPU_SUP_TRANSMETA_32
472	default y
473	bool "Support Transmeta processors" if PROCESSOR_SELECT
474	depends on !64BIT
475	help
476	  This enables detection, tunings and quirks for Transmeta processors
477
478	  You need this enabled if you want your kernel to run on a
479	  Transmeta CPU. Disabling this option on other types of CPUs
480	  makes the kernel a tiny bit smaller. Disabling it on a Transmeta
481	  CPU might render the kernel unbootable.
482
483	  If unsure, say N.
484
485config CPU_SUP_UMC_32
486	default y
487	bool "Support UMC processors" if PROCESSOR_SELECT
488	depends on M486SX || M486 || (EXPERT && !64BIT)
489	help
490	  This enables detection, tunings and quirks for UMC processors
491
492	  You need this enabled if you want your kernel to run on a
493	  UMC CPU. Disabling this option on other types of CPUs
494	  makes the kernel a tiny bit smaller. Disabling it on a UMC
495	  CPU might render the kernel unbootable.
496
497	  If unsure, say N.
498
499config CPU_SUP_ZHAOXIN
500	default y
501	bool "Support Zhaoxin processors" if PROCESSOR_SELECT
502	help
503	  This enables detection, tunings and quirks for Zhaoxin processors
504
505	  You need this enabled if you want your kernel to run on a
506	  Zhaoxin CPU. Disabling this option on other types of CPUs
507	  makes the kernel a tiny bit smaller. Disabling it on a Zhaoxin
508	  CPU might render the kernel unbootable.
509
510	  If unsure, say N.
511