# SPDX-License-Identifier: GPL-2.0
# Put here option for CPU selection and depending optimization
choice
	prompt "x86-32 Processor family"
	depends on X86_32
	default M686
	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 "586" here.

	  Note that the 386 and 486 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, AMD ELAN and all 486 based
	  CPUs.

	  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:
	  - "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).
	  - "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 Atom" for the Atom-microarchitecture CPUs.

	  See each option's help text for additional details. If you don't know
	  what to do, choose "Pentium-Pro".

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/Pentium Dual Core/Core Solo/Core Duo"
	depends on X86_32
	help
	  Select this for Intel Pentium M (not Pentium-4 M)
	  "Merom" Core Solo/Duo 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)
	    Xeons (Intel Xeon, Xeon MP, Xeon LV, Xeon MV) corename:
		-Foster
		-Prestonia
		-Gallatin

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 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 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 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.

endchoice

config CC_HAS_MARCH_NATIVE
	# This flag might not be available in cross-compilers:
	def_bool $(cc-option, -march=native)
	# LLVM 18 has an easily triggered internal compiler error in core
	# networking code with '-march=native' on certain systems:
	# https://github.com/llvm/llvm-project/issues/72026
	# LLVM 19 introduces an optimization that resolves some high stack
	# usage warnings that only appear wth '-march=native'.
	depends on CC_IS_GCC || CLANG_VERSION >= 190100

config X86_NATIVE_CPU
	bool "Build and optimize for local/native CPU"
	depends on X86_64
	depends on CC_HAS_MARCH_NATIVE
	help
	  Optimize for the current CPU used to compile the kernel.
	  Use this option if you intend to build the kernel for your
	  local machine.

	  Note that such a kernel might not work optimally on a
	  different x86 machine.

	  If unsure, say N.

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
	default "6" if MK7 || MPENTIUMM || MATOM || MVIAC7 || X86_GENERIC || X86_64
	default "4" if 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

config X86_INVD_BUG
	def_bool y
	depends on M486SX || M486

config X86_ALIGNMENT_16
	def_bool y
	depends on MWINCHIP3D || MWINCHIPC6 || MCYRIXIII || MK6 || M586MMX || M586TSC || M586 || MVIAC3_2 || MGEODEGX1

config X86_INTEL_USERCOPY
	def_bool y
	depends on MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M586MMX || X86_GENERIC || MK7 || MEFFICEON

config X86_USE_PPRO_CHECKSUM
	def_bool y
	depends on MWINCHIP3D || MWINCHIPC6 || MCYRIXIII || MK7 || MK6 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || MVIAC3_2 || MVIAC7 || MEFFICEON || MGEODE_LX || MATOM

config X86_TSC
	def_bool y
	depends on (MWINCHIP3D || MCRUSOE || MEFFICEON || MCYRIXIII || MK7 || MK6 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || M586MMX || M586TSC || MVIAC3_2 || MVIAC7 || MGEODEGX1 || MGEODE_LX || MATOM) || X86_64

config X86_HAVE_PAE
	def_bool y
	depends on MCRUSOE || MEFFICEON || MCYRIXIII || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || MVIAC7 || MATOM || X86_64

config X86_CX8
	def_bool y
	depends on X86_HAVE_PAE || M586TSC || M586MMX || MK6 || MK7 || MGEODEGX1 || MGEODE_LX

# this should be set for all -march=.. options where the compiler
# generates cmov.
config X86_CMOV
	def_bool y
	depends on (MK7 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || MVIAC3_2 || MVIAC7 || MCRUSOE || MEFFICEON || MATOM || MGEODE_LX || X86_64)

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 || MK7)
	default "5"

config X86_DEBUGCTLMSR
	def_bool y
	depends on !(MK6 || MWINCHIPC6 || MWINCHIP3D || MCYRIXIII || M586MMX || M586TSC || M586) && !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

menuconfig PROCESSOR_SELECT
	bool "Supported processor vendors" if EXPERT
	help
	  This lets you choose what x86 vendor support code your kernel
	  will include.

config BROADCAST_TLB_FLUSH
	def_bool y
	depends on CPU_SUP_AMD && 64BIT

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 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.

config CPU_SUP_VORTEX_32
	default y
	bool "Support Vortex processors" if PROCESSOR_SELECT
	depends on X86_32
	help
	  This enables detection, tunings and quirks for Vortex processors

	  You need this enabled if you want your kernel to run on a
	  Vortex CPU. Disabling this option on other types of CPUs
	  makes the kernel a tiny bit smaller.

	  If unsure, say N.