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Edit File: Kconfig.cpu

# SPDX-License-Identifier: GPL-2.0 # Put here option for CPU selection and depending optimization choice prompt "Processor family" default M686 if X86_32 default GENERIC_CPU if X86_64 help This is the processor type of your CPU. This information is used for optimizing purposes. In order to compile a kernel that can run on all supported x86 CPU types (albeit not optimally fast), you can specify "486" here. Note that the 386 is no longer supported, this includes AMD/Cyrix/Intel 386DX/DXL/SL/SLC/SX, Cyrix/TI 486DLC/DLC2, UMC 486SX-S and the NexGen Nx586. The kernel will not necessarily run on earlier architectures than the one you have chosen, e.g. a Pentium optimized kernel will run on a PPro, but not necessarily on a i486. Here are the settings recommended for greatest speed: - "486" for the AMD/Cyrix/IBM/Intel 486DX/DX2/DX4 or SL/SLC/SLC2/SLC3/SX/SX2 and UMC U5D or U5S. - "586" for generic Pentium CPUs lacking the TSC (time stamp counter) register. - "Pentium-Classic" for the Intel Pentium. - "Pentium-MMX" for the Intel Pentium MMX. - "Pentium-Pro" for the Intel Pentium Pro. - "Pentium-II" for the Intel Pentium II or pre-Coppermine Celeron. - "Pentium-III" for the Intel Pentium III or Coppermine Celeron. - "Pentium-4" for the Intel Pentium 4 or P4-based Celeron. - "K6" for the AMD K6, K6-II and K6-III (aka K6-3D). - "Athlon" for the AMD K7 family (Athlon/Duron/Thunderbird). - "Opteron/Athlon64/Hammer/K8" for all K8 and newer AMD CPUs. - "Crusoe" for the Transmeta Crusoe series. - "Efficeon" for the Transmeta Efficeon series. - "Winchip-C6" for original IDT Winchip. - "Winchip-2" for IDT Winchips with 3dNow! capabilities. - "AMD Elan" for the 32-bit AMD Elan embedded CPU. - "GeodeGX1" for Geode GX1 (Cyrix MediaGX). - "Geode GX/LX" For AMD Geode GX and LX processors. - "CyrixIII/VIA C3" for VIA Cyrix III or VIA C3. - "VIA C3-2" for VIA C3-2 "Nehemiah" (model 9 and above). - "VIA C7" for VIA C7. - "Intel P4" for the Pentium 4/Netburst microarchitecture. - "Core 2/newer Xeon" for all core2 and newer Intel CPUs. - "Intel Atom" for the Atom-microarchitecture CPUs. - "Generic-x86-64" for a kernel which runs on any x86-64 CPU. See each option's help text for additional details. If you don't know what to do, choose "486". config M486SX bool "486SX" depends on X86_32 help Select this for an 486-class CPU without an FPU such as AMD/Cyrix/IBM/Intel SL/SLC/SLC2/SLC3/SX/SX2 and UMC U5S. config M486 bool "486DX" depends on X86_32 help Select this for an 486-class CPU such as AMD/Cyrix/IBM/Intel 486DX/DX2/DX4 and UMC U5D. config M586 bool "586/K5/5x86/6x86/6x86MX" depends on X86_32 help Select this for an 586 or 686 series processor such as the AMD K5, the Cyrix 5x86, 6x86 and 6x86MX. This choice does not assume the RDTSC (Read Time Stamp Counter) instruction. config M586TSC bool "Pentium-Classic" depends on X86_32 help Select this for a Pentium Classic processor with the RDTSC (Read Time Stamp Counter) instruction for benchmarking. config M586MMX bool "Pentium-MMX" depends on X86_32 help Select this for a Pentium with the MMX graphics/multimedia extended instructions. config M686 bool "Pentium-Pro" depends on X86_32 help Select this for Intel Pentium Pro chips. This enables the use of Pentium Pro extended instructions, and disables the init-time guard against the f00f bug found in earlier Pentiums. config MPENTIUMII bool "Pentium-II/Celeron(pre-Coppermine)" depends on X86_32 help Select this for Intel chips based on the Pentium-II and pre-Coppermine Celeron core. This option enables an unaligned copy optimization, compiles the kernel with optimization flags tailored for the chip, and applies any applicable Pentium Pro optimizations. config MPENTIUMIII bool "Pentium-III/Celeron(Coppermine)/Pentium-III Xeon" depends on X86_32 help Select this for Intel chips based on the Pentium-III and Celeron-Coppermine core. This option enables use of some extended prefetch instructions in addition to the Pentium II extensions. config MPENTIUMM bool "Pentium M" depends on X86_32 help Select this for Intel Pentium M (not Pentium-4 M) notebook chips. config MPENTIUM4 bool "Pentium-4/Celeron(P4-based)/Pentium-4 M/older Xeon" depends on X86_32 help Select this for Intel Pentium 4 chips. This includes the Pentium 4, Pentium D, P4-based Celeron and Xeon, and Pentium-4 M (not Pentium M) chips. This option enables compile flags optimized for the chip, uses the correct cache line size, and applies any applicable optimizations. CPUIDs: F[0-6][1-A] (in /proc/cpuinfo show = cpu family : 15 ) Select this for: Pentiums (Pentium 4, Pentium D, Celeron, Celeron D) corename: -Willamette -Northwood -Mobile Pentium 4 -Mobile Pentium 4 M -Extreme Edition (Gallatin) -Prescott -Prescott 2M -Cedar Mill -Presler -Smithfiled Xeons (Intel Xeon, Xeon MP, Xeon LV, Xeon MV) corename: -Foster -Prestonia -Gallatin -Nocona -Irwindale -Cranford -Potomac -Paxville -Dempsey config MK6 bool "K6/K6-II/K6-III" depends on X86_32 help Select this for an AMD K6-family processor. Enables use of some extended instructions, and passes appropriate optimization flags to GCC. config MK7 bool "Athlon/Duron/K7" depends on X86_32 help Select this for an AMD Athlon K7-family processor. Enables use of some extended instructions, and passes appropriate optimization flags to GCC. config MK8 bool "Opteron/Athlon64/Hammer/K8" help Select this for an AMD Opteron or Athlon64 Hammer-family processor. Enables use of some extended instructions, and passes appropriate optimization flags to GCC. config MCRUSOE bool "Crusoe" depends on X86_32 help Select this for a Transmeta Crusoe processor. Treats the processor like a 586 with TSC, and sets some GCC optimization flags (like a Pentium Pro with no alignment requirements). config MEFFICEON bool "Efficeon" depends on X86_32 help Select this for a Transmeta Efficeon processor. config MWINCHIPC6 bool "Winchip-C6" depends on X86_32 help Select this for an IDT Winchip C6 chip. Linux and GCC treat this chip as a 586TSC with some extended instructions and alignment requirements. config MWINCHIP3D bool "Winchip-2/Winchip-2A/Winchip-3" depends on X86_32 help Select this for an IDT Winchip-2, 2A or 3. Linux and GCC treat this chip as a 586TSC with some extended instructions and alignment requirements. Also enable out of order memory stores for this CPU, which can increase performance of some operations. config MELAN bool "AMD Elan" depends on X86_32 help Select this for an AMD Elan processor. Do not use this option for K6/Athlon/Opteron processors! config MGEODEGX1 bool "GeodeGX1" depends on X86_32 help Select this for a Geode GX1 (Cyrix MediaGX) chip. config MGEODE_LX bool "Geode GX/LX" depends on X86_32 help Select this for AMD Geode GX and LX processors. config MCYRIXIII bool "CyrixIII/VIA-C3" depends on X86_32 help Select this for a Cyrix III or C3 chip. Presently Linux and GCC treat this chip as a generic 586. Whilst the CPU is 686 class, it lacks the cmov extension which gcc assumes is present when generating 686 code. Note that Nehemiah (Model 9) and above will not boot with this kernel due to them lacking the 3DNow! instructions used in earlier incarnations of the CPU. config MVIAC3_2 bool "VIA C3-2 (Nehemiah)" depends on X86_32 help Select this for a VIA C3 "Nehemiah". Selecting this enables usage of SSE and tells gcc to treat the CPU as a 686. Note, this kernel will not boot on older (pre model 9) C3s. config MVIAC7 bool "VIA C7" depends on X86_32 help Select this for a VIA C7. Selecting this uses the correct cache shift and tells gcc to treat the CPU as a 686. config MPSC bool "Intel P4 / older Netburst based Xeon" depends on X86_64 help Optimize for Intel Pentium 4, Pentium D and older Nocona/Dempsey Xeon CPUs with Intel 64bit which is compatible with x86-64. Note that the latest Xeons (Xeon 51xx and 53xx) are not based on the Netburst core and shouldn't use this option. You can distinguish them using the cpu family field in /proc/cpuinfo. Family 15 is an older Xeon, Family 6 a newer one. config MCORE2 bool "Core 2/newer Xeon" help Select this for Intel Core 2 and newer Core 2 Xeons (Xeon 51xx and 53xx) CPUs. You can distinguish newer from older Xeons by the CPU family in /proc/cpuinfo. Newer ones have 6 and older ones 15 (not a typo) config MATOM bool "Intel Atom" help Select this for the Intel Atom platform. Intel Atom CPUs have an in-order pipelining architecture and thus can benefit from accordingly optimized code. Use a recent GCC with specific Atom support in order to fully benefit from selecting this option. config GENERIC_CPU bool "Generic-x86-64" depends on X86_64 help Generic x86-64 CPU. Run equally well on all x86-64 CPUs. endchoice config X86_GENERIC bool "Generic x86 support" depends on X86_32 help Instead of just including optimizations for the selected x86 variant (e.g. PII, Crusoe or Athlon), include some more generic optimizations as well. This will make the kernel perform better on x86 CPUs other than that selected. This is really intended for distributors who need more generic optimizations. # # Define implied options from the CPU selection here config X86_INTERNODE_CACHE_SHIFT int default "12" if X86_VSMP default X86_L1_CACHE_SHIFT config X86_L1_CACHE_SHIFT int default "7" if MPENTIUM4 || MPSC default "6" if MK7 || MK8 || MPENTIUMM || MCORE2 || MATOM || MVIAC7 || X86_GENERIC || GENERIC_CPU default "4" if MELAN || M486SX || M486 || MGEODEGX1 default "5" if MWINCHIP3D || MWINCHIPC6 || MCRUSOE || MEFFICEON || MCYRIXIII || MK6 || MPENTIUMIII || MPENTIUMII || M686 || M586MMX || M586TSC || M586 || MVIAC3_2 || MGEODE_LX config X86_F00F_BUG def_bool y depends on M586MMX || M586TSC || M586 || M486SX || M486 config X86_INVD_BUG def_bool y depends on M486SX || M486 config X86_ALIGNMENT_16 def_bool y depends on MWINCHIP3D || MWINCHIPC6 || MCYRIXIII || MELAN || MK6 || M586MMX || M586TSC || M586 || M486SX || M486 || MVIAC3_2 || MGEODEGX1 config X86_INTEL_USERCOPY def_bool y depends on MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M586MMX || X86_GENERIC || MK8 || MK7 || MEFFICEON || MCORE2 config X86_USE_PPRO_CHECKSUM def_bool y depends on MWINCHIP3D || MWINCHIPC6 || MCYRIXIII || MK7 || MK6 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || MK8 || MVIAC3_2 || MVIAC7 || MEFFICEON || MGEODE_LX || MCORE2 || MATOM config X86_USE_3DNOW def_bool y depends on (MCYRIXIII || MK7 || MGEODE_LX) && !UML # # P6_NOPs are a relatively minor optimization that require a family >= # 6 processor, except that it is broken on certain VIA chips. # Furthermore, AMD chips prefer a totally different sequence of NOPs # (which work on all CPUs). In addition, it looks like Virtual PC # does not understand them. # # As a result, disallow these if we're not compiling for X86_64 (these # NOPs do work on all x86-64 capable chips); the list of processors in # the right-hand clause are the cores that benefit from this optimization. # config X86_P6_NOP def_bool y depends on X86_64 depends on (MCORE2 || MPENTIUM4 || MPSC) config X86_TSC def_bool y 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 config X86_CMPXCHG64 def_bool y depends on X86_PAE || X86_64 || MCORE2 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || M586TSC || M586MMX || MATOM || MGEODE_LX || MGEODEGX1 || MK6 || MK7 || MK8 # this should be set for all -march=.. options where the compiler # generates cmov. config X86_CMOV def_bool y depends on (MK8 || MK7 || MCORE2 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || MVIAC3_2 || MVIAC7 || MCRUSOE || MEFFICEON || X86_64 || MATOM || MGEODE_LX) config X86_MINIMUM_CPU_FAMILY int default "64" if X86_64 default "6" if X86_32 && (MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || MVIAC3_2 || MVIAC7 || MEFFICEON || MATOM || MCORE2 || MK7 || MK8) default "5" if X86_32 && X86_CMPXCHG64 default "4" config X86_DEBUGCTLMSR def_bool y depends on !(MK6 || MWINCHIPC6 || MWINCHIP3D || MCYRIXIII || M586MMX || M586TSC || M586 || M486SX || M486) && !UML config IA32_FEAT_CTL def_bool y depends on CPU_SUP_INTEL || CPU_SUP_CENTAUR || CPU_SUP_ZHAOXIN config X86_VMX_FEATURE_NAMES def_bool y depends on IA32_FEAT_CTL && X86_FEATURE_NAMES menuconfig PROCESSOR_SELECT bool "Supported processor vendors" if EXPERT help This lets you choose what x86 vendor support code your kernel will include. config CPU_SUP_INTEL default y bool "Support Intel processors" if PROCESSOR_SELECT help This enables detection, tunings and quirks for Intel processors You need this enabled if you want your kernel to run on an Intel CPU. Disabling this option on other types of CPUs makes the kernel a tiny bit smaller. Disabling it on an Intel CPU might render the kernel unbootable. If unsure, say N. config CPU_SUP_CYRIX_32 default y bool "Support Cyrix processors" if PROCESSOR_SELECT depends on M486SX || M486 || M586 || M586TSC || M586MMX || (EXPERT && !64BIT) help This enables detection, tunings and quirks for Cyrix processors You need this enabled if you want your kernel to run on a Cyrix CPU. Disabling this option on other types of CPUs makes the kernel a tiny bit smaller. Disabling it on a Cyrix CPU might render the kernel unbootable. If unsure, say N. config CPU_SUP_AMD default y bool "Support AMD processors" if PROCESSOR_SELECT help This enables detection, tunings and quirks for AMD processors You need this enabled if you want your kernel to run on an AMD CPU. Disabling this option on other types of CPUs makes the kernel a tiny bit smaller. Disabling it on an AMD CPU might render the kernel unbootable. If unsure, say N. config CPU_SUP_HYGON default y bool "Support Hygon processors" if PROCESSOR_SELECT select CPU_SUP_AMD help This enables detection, tunings and quirks for Hygon processors You need this enabled if you want your kernel to run on an Hygon CPU. Disabling this option on other types of CPUs makes the kernel a tiny bit smaller. Disabling it on an Hygon CPU might render the kernel unbootable. If unsure, say N. config CPU_SUP_CENTAUR default y bool "Support Centaur processors" if PROCESSOR_SELECT help This enables detection, tunings and quirks for Centaur processors You need this enabled if you want your kernel to run on a Centaur CPU. Disabling this option on other types of CPUs makes the kernel a tiny bit smaller. Disabling it on a Centaur CPU might render the kernel unbootable. If unsure, say N. config CPU_SUP_TRANSMETA_32 default y bool "Support Transmeta processors" if PROCESSOR_SELECT depends on !64BIT help This enables detection, tunings and quirks for Transmeta processors You need this enabled if you want your kernel to run on a Transmeta CPU. Disabling this option on other types of CPUs makes the kernel a tiny bit smaller. Disabling it on a Transmeta CPU might render the kernel unbootable. If unsure, say N. config CPU_SUP_UMC_32 default y bool "Support UMC processors" if PROCESSOR_SELECT depends on M486SX || M486 || (EXPERT && !64BIT) help This enables detection, tunings and quirks for UMC processors You need this enabled if you want your kernel to run on a UMC CPU. Disabling this option on other types of CPUs makes the kernel a tiny bit smaller. Disabling it on a UMC CPU might render the kernel unbootable. If unsure, say N. config CPU_SUP_ZHAOXIN default y bool "Support Zhaoxin processors" if PROCESSOR_SELECT help This enables detection, tunings and quirks for Zhaoxin processors You need this enabled if you want your kernel to run on a Zhaoxin CPU. Disabling this option on other types of CPUs makes the kernel a tiny bit smaller. Disabling it on a Zhaoxin CPU might render the kernel unbootable. If unsure, say N.