1 # Put here option for CPU selection and depending optimization
5 prompt "Processor family"
12 This is the processor type of your CPU. This information is used for
13 optimizing purposes. In order to compile a kernel that can run on
14 all x86 CPU types (albeit not optimally fast), you can specify
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.
21 Here are the settings recommended for greatest speed:
22 - "386" for the AMD/Cyrix/Intel 386DX/DXL/SL/SLC/SX, Cyrix/TI
23 486DLC/DLC2, UMC 486SX-S and NexGen Nx586. Only "386" kernels
24 will run on a 386 class machine.
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 Winchip 2.
41 - "Winchip-2A" 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).
47 If you don't know what to do, choose "386".
52 Select this for a 486 series processor, either Intel or one of the
53 compatible processors from AMD, Cyrix, IBM, or Intel. Includes DX,
54 DX2, and DX4 variants; also SL/SLC/SLC2/SLC3/SX/SX2 and UMC U5D or
58 bool "586/K5/5x86/6x86/6x86MX"
60 Select this for an 586 or 686 series processor such as the AMD K5,
61 the Cyrix 5x86, 6x86 and 6x86MX. This choice does not
62 assume the RDTSC (Read Time Stamp Counter) instruction.
65 bool "Pentium-Classic"
67 Select this for a Pentium Classic processor with the RDTSC (Read
68 Time Stamp Counter) instruction for benchmarking.
73 Select this for a Pentium with the MMX graphics/multimedia
74 extended instructions.
79 Select this for Intel Pentium Pro chips. This enables the use of
80 Pentium Pro extended instructions, and disables the init-time guard
81 against the f00f bug found in earlier Pentiums.
84 bool "Pentium-II/Celeron(pre-Coppermine)"
86 Select this for Intel chips based on the Pentium-II and
87 pre-Coppermine Celeron core. This option enables an unaligned
88 copy optimization, compiles the kernel with optimization flags
89 tailored for the chip, and applies any applicable Pentium Pro
93 bool "Pentium-III/Celeron(Coppermine)/Pentium-III Xeon"
95 Select this for Intel chips based on the Pentium-III and
96 Celeron-Coppermine core. This option enables use of some
97 extended prefetch instructions in addition to the Pentium II
103 Select this for Intel Pentium M (not Pentium-4 M)
107 bool "Core 2/newer Xeon"
109 Select this for Intel Core 2 and newer Core 2 Xeons (Xeon 51xx and 53xx)
110 CPUs. You can distingush newer from older Xeons by the CPU family
111 in /proc/cpuinfo. Newer ones have 6.
114 bool "Pentium-4/Celeron(P4-based)/Pentium-4 M/older Xeon"
116 Select this for Intel Pentium 4 chips. This includes the
117 Pentium 4, P4-based Celeron and Xeon, and Pentium-4 M
118 (not Pentium M) chips. This option enables compile flags
119 optimized for the chip, uses the correct cache shift, and
120 applies any applicable Pentium III optimizations.
123 bool "K6/K6-II/K6-III"
125 Select this for an AMD K6-family processor. Enables use of
126 some extended instructions, and passes appropriate optimization
130 bool "Athlon/Duron/K7"
132 Select this for an AMD Athlon K7-family processor. Enables use of
133 some extended instructions, and passes appropriate optimization
137 bool "Opteron/Athlon64/Hammer/K8"
139 Select this for an AMD Opteron or Athlon64 Hammer-family processor. Enables
140 use of some extended instructions, and passes appropriate optimization
146 Select this for a Transmeta Crusoe processor. Treats the processor
147 like a 586 with TSC, and sets some GCC optimization flags (like a
148 Pentium Pro with no alignment requirements).
153 Select this for a Transmeta Efficeon processor.
158 Select this for an IDT Winchip C6 chip. Linux and GCC
159 treat this chip as a 586TSC with some extended instructions
160 and alignment requirements.
165 Select this for an IDT Winchip-2. Linux and GCC
166 treat this chip as a 586TSC with some extended instructions
167 and alignment requirements.
170 bool "Winchip-2A/Winchip-3"
172 Select this for an IDT Winchip-2A or 3. Linux and GCC
173 treat this chip as a 586TSC with some extended instructions
174 and alignment reqirements. Also enable out of order memory
175 stores for this CPU, which can increase performance of some
181 Select this for a Geode GX1 (Cyrix MediaGX) chip.
186 Select this for AMD Geode GX and LX processors.
189 bool "CyrixIII/VIA-C3"
191 Select this for a Cyrix III or C3 chip. Presently Linux and GCC
192 treat this chip as a generic 586. Whilst the CPU is 686 class,
193 it lacks the cmov extension which gcc assumes is present when
195 Note that Nehemiah (Model 9) and above will not boot with this
196 kernel due to them lacking the 3DNow! instructions used in earlier
197 incarnations of the CPU.
200 bool "VIA C3-2 (Nehemiah)"
202 Select this for a VIA C3 "Nehemiah". Selecting this enables usage
203 of SSE and tells gcc to treat the CPU as a 686.
204 Note, this kernel will not boot on older (pre model 9) C3s.
209 bool "Generic x86 support"
211 Instead of just including optimizations for the selected
212 x86 variant (e.g. PII, Crusoe or Athlon), include some more
213 generic optimizations as well. This will make the kernel
214 perform better on x86 CPUs other than that selected.
216 This is really intended for distributors who need more
217 generic optimizations.
222 # Define implied options from the CPU selection here
229 config X86_L1_CACHE_SHIFT
231 default "7" if MPENTIUM4 || X86_GENERIC
232 default "4" if X86_ELAN || M486 || M386 || MGEODEGX1
233 default "5" if MWINCHIP3D || MWINCHIP2 || MWINCHIPC6 || MCRUSOE || MEFFICEON || MCYRIXIII || MK6 || MPENTIUMIII || MPENTIUMII || M686 || M586MMX || M586TSC || M586 || MVIAC3_2 || MGEODE_LX
234 default "6" if MK7 || MK8 || MPENTIUMM || MCORE2
236 config RWSEM_GENERIC_SPINLOCK
241 config RWSEM_XCHGADD_ALGORITHM
246 config ARCH_HAS_ILOG2_U32
250 config ARCH_HAS_ILOG2_U64
254 config GENERIC_CALIBRATE_DELAY
258 config X86_PPRO_FENCE
260 depends on M686 || M586MMX || M586TSC || M586 || M486 || M386 || MGEODEGX1
265 depends on M586MMX || M586TSC || M586 || M486 || M386
268 config X86_WP_WORKS_OK
290 depends on !M386 && !M486
293 config X86_ALIGNMENT_16
295 depends on MWINCHIP3D || MWINCHIP2 || MWINCHIPC6 || MCYRIXIII || X86_ELAN || MK6 || M586MMX || M586TSC || M586 || M486 || MVIAC3_2 || MGEODEGX1
300 depends on MK7 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || M586MMX || MK8 || MEFFICEON || MCORE2
303 config X86_INTEL_USERCOPY
305 depends on MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M586MMX || X86_GENERIC || MK8 || MK7 || MEFFICEON || MCORE2
308 config X86_USE_PPRO_CHECKSUM
310 depends on MWINCHIP3D || MWINCHIP2 || MWINCHIPC6 || MCYRIXIII || MK7 || MK6 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || MK8 || MVIAC3_2 || MEFFICEON || MGEODE_LX || MCORE2
315 depends on (MCYRIXIII || MK7 || MGEODE_LX) && !UML
320 depends on (MWINCHIP3D || MWINCHIP2 || MWINCHIPC6) && MTRR
325 depends on (MWINCHIP3D || MWINCHIP2 || MCRUSOE || MEFFICEON || MCYRIXIII || MK7 || MK6 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || M586MMX || M586TSC || MK8 || MVIAC3_2 || MGEODEGX1 || MGEODE_LX || MCORE2) && !X86_NUMAQ