1 # Put here option for CPU selection and depending optimization
5 prompt "Processor family"
7 default GENERIC_CPU if X86_64
11 depends on X86_32 && !UML
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
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.
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
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 Winchip 2.
42 - "Winchip-2A" for IDT Winchips with 3dNow! capabilities.
43 - "GeodeGX1" for Geode GX1 (Cyrix MediaGX).
44 - "Geode GX/LX" For AMD Geode GX and LX processors.
45 - "CyrixIII/VIA C3" for VIA Cyrix III or VIA C3.
46 - "VIA C3-2" for VIA C3-2 "Nehemiah" (model 9 and above).
47 - "VIA C7" for VIA C7.
49 If you don't know what to do, choose "386".
55 Select this for a 486 series processor, either Intel or one of the
56 compatible processors from AMD, Cyrix, IBM, or Intel. Includes DX,
57 DX2, and DX4 variants; also SL/SLC/SLC2/SLC3/SX/SX2 and UMC U5D or
61 bool "586/K5/5x86/6x86/6x86MX"
64 Select this for an 586 or 686 series processor such as the AMD K5,
65 the Cyrix 5x86, 6x86 and 6x86MX. This choice does not
66 assume the RDTSC (Read Time Stamp Counter) instruction.
69 bool "Pentium-Classic"
72 Select this for a Pentium Classic processor with the RDTSC (Read
73 Time Stamp Counter) instruction for benchmarking.
79 Select this for a Pentium with the MMX graphics/multimedia
80 extended instructions.
86 Select this for Intel Pentium Pro chips. This enables the use of
87 Pentium Pro extended instructions, and disables the init-time guard
88 against the f00f bug found in earlier Pentiums.
91 bool "Pentium-II/Celeron(pre-Coppermine)"
94 Select this for Intel chips based on the Pentium-II and
95 pre-Coppermine Celeron core. This option enables an unaligned
96 copy optimization, compiles the kernel with optimization flags
97 tailored for the chip, and applies any applicable Pentium Pro
101 bool "Pentium-III/Celeron(Coppermine)/Pentium-III Xeon"
104 Select this for Intel chips based on the Pentium-III and
105 Celeron-Coppermine core. This option enables use of some
106 extended prefetch instructions in addition to the Pentium II
113 Select this for Intel Pentium M (not Pentium-4 M)
117 bool "Pentium-4/Celeron(P4-based)/Pentium-4 M/older Xeon"
120 Select this for Intel Pentium 4 chips. This includes the
121 Pentium 4, Pentium D, P4-based Celeron and Xeon, and
122 Pentium-4 M (not Pentium M) chips. This option enables compile
123 flags optimized for the chip, uses the correct cache line size, and
124 applies any applicable optimizations.
126 CPUIDs: F[0-6][1-A] (in /proc/cpuinfo show = cpu family : 15 )
129 Pentiums (Pentium 4, Pentium D, Celeron, Celeron D) corename:
134 -Extreme Edition (Gallatin)
140 Xeons (Intel Xeon, Xeon MP, Xeon LV, Xeon MV) corename:
153 bool "K6/K6-II/K6-III"
156 Select this for an AMD K6-family processor. Enables use of
157 some extended instructions, and passes appropriate optimization
161 bool "Athlon/Duron/K7"
164 Select this for an AMD Athlon K7-family processor. Enables use of
165 some extended instructions, and passes appropriate optimization
169 bool "Opteron/Athlon64/Hammer/K8"
171 Select this for an AMD Opteron or Athlon64 Hammer-family processor. Enables
172 use of some extended instructions, and passes appropriate optimization
179 Select this for a Transmeta Crusoe processor. Treats the processor
180 like a 586 with TSC, and sets some GCC optimization flags (like a
181 Pentium Pro with no alignment requirements).
187 Select this for a Transmeta Efficeon processor.
193 Select this for an IDT Winchip C6 chip. Linux and GCC
194 treat this chip as a 586TSC with some extended instructions
195 and alignment requirements.
201 Select this for an IDT Winchip-2. Linux and GCC
202 treat this chip as a 586TSC with some extended instructions
203 and alignment requirements.
206 bool "Winchip-2A/Winchip-3"
209 Select this for an IDT Winchip-2A or 3. Linux and GCC
210 treat this chip as a 586TSC with some extended instructions
211 and alignment requirements. Also enable out of order memory
212 stores for this CPU, which can increase performance of some
219 Select this for a Geode GX1 (Cyrix MediaGX) chip.
225 Select this for AMD Geode GX and LX processors.
228 bool "CyrixIII/VIA-C3"
231 Select this for a Cyrix III or C3 chip. Presently Linux and GCC
232 treat this chip as a generic 586. Whilst the CPU is 686 class,
233 it lacks the cmov extension which gcc assumes is present when
235 Note that Nehemiah (Model 9) and above will not boot with this
236 kernel due to them lacking the 3DNow! instructions used in earlier
237 incarnations of the CPU.
240 bool "VIA C3-2 (Nehemiah)"
243 Select this for a VIA C3 "Nehemiah". Selecting this enables usage
244 of SSE and tells gcc to treat the CPU as a 686.
245 Note, this kernel will not boot on older (pre model 9) C3s.
251 Select this for a VIA C7. Selecting this uses the correct cache
252 shift and tells gcc to treat the CPU as a 686.
255 bool "Intel P4 / older Netburst based Xeon"
258 Optimize for Intel Pentium 4, Pentium D and older Nocona/Dempsey
259 Xeon CPUs with Intel 64bit which is compatible with x86-64.
260 Note that the latest Xeons (Xeon 51xx and 53xx) are not based on the
261 Netburst core and shouldn't use this option. You can distinguish them
262 using the cpu family field
263 in /proc/cpuinfo. Family 15 is an older Xeon, Family 6 a newer one.
266 bool "Core 2/newer Xeon"
268 Select this for Intel Core 2 and newer Core 2 Xeons (Xeon 51xx and 53xx)
269 CPUs. You can distinguish newer from older Xeons by the CPU family
270 in /proc/cpuinfo. Newer ones have 6 and older ones 15 (not a typo)
273 bool "Generic-x86-64"
277 Run equally well on all x86-64 CPUs.
282 bool "Generic x86 support"
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.
290 This is really intended for distributors who need more
291 generic optimizations.
297 select GENERIC_FIND_FIRST_BIT
298 select GENERIC_FIND_NEXT_BIT
301 # Define implied options from the CPU selection here
302 config X86_L1_CACHE_BYTES
304 default "128" if GENERIC_CPU || MPSC
305 default "64" if MK8 || MCORE2
308 config X86_INTERNODE_CACHE_BYTES
310 default "4096" if X86_VSMP
311 default X86_L1_CACHE_BYTES if !X86_VSMP
315 def_bool X86_64 || (X86_32 && !M386)
317 config X86_L1_CACHE_SHIFT
319 default "7" if MPENTIUM4 || X86_GENERIC || GENERIC_CPU || MPSC
320 default "4" if X86_ELAN || M486 || M386 || MGEODEGX1
321 default "5" if MWINCHIP3D || MWINCHIP2 || MWINCHIPC6 || MCRUSOE || MEFFICEON || MCYRIXIII || MK6 || MPENTIUMIII || MPENTIUMII || M686 || M586MMX || M586TSC || M586 || MVIAC3_2 || MGEODE_LX
322 default "6" if MK7 || MK8 || MPENTIUMM || MCORE2 || MVIAC7
326 depends on X86_32 && !M386
328 config X86_PPRO_FENCE
329 bool "PentiumPro memory ordering errata workaround"
330 depends on M686 || M586MMX || M586TSC || M586 || M486 || M386 || MGEODEGX1
332 Old PentiumPro multiprocessor systems had errata that could cause memory
333 operations to violate the x86 ordering standard in rare cases. Enabling this
334 option will attempt to work around some (but not all) occurances of
335 this problem, at the cost of much heavier spinlock and memory barrier
338 If unsure, say n here. Even distro kernels should think twice before enabling
339 this: there are few systems, and an unlikely bug.
343 depends on M586MMX || M586TSC || M586 || M486 || M386
345 config X86_WP_WORKS_OK
351 depends on X86_32 && !M386
355 depends on X86_32 && !M386
359 depends on X86_32 && !M386
361 config X86_ALIGNMENT_16
363 depends on MWINCHIP3D || MWINCHIP2 || MWINCHIPC6 || MCYRIXIII || X86_ELAN || MK6 || M586MMX || M586TSC || M586 || M486 || MVIAC3_2 || MGEODEGX1
365 config X86_INTEL_USERCOPY
367 depends on MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M586MMX || X86_GENERIC || MK8 || MK7 || MEFFICEON || MCORE2
369 config X86_USE_PPRO_CHECKSUM
371 depends on MWINCHIP3D || MWINCHIP2 || MWINCHIPC6 || MCYRIXIII || MK7 || MK6 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || MK8 || MVIAC3_2 || MEFFICEON || MGEODE_LX || MCORE2
375 depends on (MCYRIXIII || MK7 || MGEODE_LX) && !UML
379 depends on (MWINCHIP3D || MWINCHIP2 || MWINCHIPC6) && MTRR
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.
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.
395 depends on (MCORE2 || MPENTIUM4 || MPSC)
399 depends on ((MWINCHIP3D || MWINCHIP2 || MCRUSOE || MEFFICEON || MCYRIXIII || MK7 || MK6 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || M586MMX || M586TSC || MK8 || MVIAC3_2 || MVIAC7 || MGEODEGX1 || MGEODE_LX || MCORE2) && !X86_NUMAQ) || X86_64
403 depends on X86_PAE || X86_64
405 # this should be set for all -march=.. options where the compiler
409 depends on (MK7 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || MVIAC3_2 || MVIAC7 || X86_64)
411 config X86_MINIMUM_CPU_FAMILY
413 default "64" if X86_64
414 default "6" if X86_32 && X86_P6_NOP
415 default "4" if X86_32 && (X86_XADD || X86_CMPXCHG || X86_BSWAP || X86_WP_WORKS_OK)
418 config X86_DEBUGCTLMSR
420 depends on !(MK6 || MWINCHIPC6 || MWINCHIP2 || MWINCHIP3D || MCYRIXIII || M586MMX || M586TSC || M586 || M486 || M386)
423 bool "Debug Store support"
426 Add support for Debug Store.
427 This allows the kernel to provide a memory buffer to the hardware
428 to store various profiling and tracing events.
430 config X86_PTRACE_BTS
431 bool "ptrace interface to Branch Trace Store"
433 depends on (X86_DS && X86_DEBUGCTLMSR)
435 Add a ptrace interface to allow collecting an execution trace
437 This collects control flow changes in a (cyclic) buffer and allows
438 debuggers to fill in the gaps and show an execution trace of the debuggee.