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Commit 366d19e1 authored by Tobias Doerffel's avatar Tobias Doerffel Committed by Ingo Molnar
Browse files

x86: add specific support for Intel Atom architecture 



Add another option when selecting CPU family so the kernel can be
optimized for Intel Atom CPUs. If GCC supports tuning options for
Intel Atom they will be used.

Signed-off-by: default avatarTobias Doerffel <tobias.doerffel@gmail.com>
Signed-off-by: default avatarH. Peter Anvin <hpa@zytor.com>
LKML-Reference: <1251018457-19157-1-git-send-email-tobias.doerffel@gmail.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 8a517c51

arch/x86/Kconfig.cpu

+14 −5
Original line number Diff line number Diff line
@@ -262,6 +262,15 @@ config MCORE2 
	  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
@@ -295,7 +304,7 @@ config X86_CPU 
config X86_L1_CACHE_BYTES

	int

	default "128" if MPSC

	default "64" if GENERIC_CPU || MK8 || MCORE2 || X86_32

	default "64" if GENERIC_CPU || MK8 || MCORE2 || MATOM || X86_32



config X86_INTERNODE_CACHE_BYTES

	int
@@ -310,7 +319,7 @@ config X86_L1_CACHE_SHIFT 
	default "7" if MPENTIUM4 || MPSC

	default "4" if X86_ELAN || M486 || M386 || MGEODEGX1

	default "5" if MWINCHIP3D || MWINCHIPC6 || MCRUSOE || MEFFICEON || MCYRIXIII || MK6 || MPENTIUMIII || MPENTIUMII || M686 || M586MMX || M586TSC || M586 || MVIAC3_2 || MGEODE_LX

	default "6" if MK7 || MK8 || MPENTIUMM || MCORE2 || MVIAC7 || X86_GENERIC || GENERIC_CPU

	default "6" if MK7 || MK8 || MPENTIUMM || MCORE2 || MATOM || MVIAC7 || X86_GENERIC || GENERIC_CPU



config X86_XADD

	def_bool y
@@ -359,7 +368,7 @@ config X86_INTEL_USERCOPY 


config X86_USE_PPRO_CHECKSUM

	def_bool y

	depends on MWINCHIP3D || MWINCHIPC6 || MCYRIXIII || MK7 || MK6 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || MK8 || MVIAC3_2 || MEFFICEON || MGEODE_LX || MCORE2

	depends on MWINCHIP3D || MWINCHIPC6 || MCYRIXIII || MK7 || MK6 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || MK8 || MVIAC3_2 || MEFFICEON || MGEODE_LX || MCORE2 || MATOM



config X86_USE_3DNOW

	def_bool y
@@ -387,7 +396,7 @@ config X86_P6_NOP 


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) && !X86_NUMAQ) || X86_64

	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_NUMAQ) || X86_64



config X86_CMPXCHG64

	def_bool y
@@ -397,7 +406,7 @@ config X86_CMPXCHG64 
# 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)

	depends on (MK8 || MK7 || MCORE2 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || MVIAC3_2 || MVIAC7 || MCRUSOE || MEFFICEON || X86_64 || MATOM)



config X86_MINIMUM_CPU_FAMILY

	int

arch/x86/Makefile

+2 −0
Original line number Diff line number Diff line
@@ -55,6 +55,8 @@ else 


        cflags-$(CONFIG_MCORE2) += \

                $(call cc-option,-march=core2,$(call cc-option,-mtune=generic))

	cflags-$(CONFIG_MATOM) += $(call cc-option,-march=atom) \

		$(call cc-option,-mtune=atom,$(call cc-option,-mtune=generic))

        cflags-$(CONFIG_GENERIC_CPU) += $(call cc-option,-mtune=generic)

        KBUILD_CFLAGS += $(cflags-y)

arch/x86/Makefile_32.cpu

+2 −0
Original line number Diff line number Diff line
@@ -33,6 +33,8 @@ cflags-$(CONFIG_MCYRIXIII) += $(call cc-option,-march=c3,-march=i486) $(align)-f 
cflags-$(CONFIG_MVIAC3_2)	+= $(call cc-option,-march=c3-2,-march=i686)

cflags-$(CONFIG_MVIAC7)		+= -march=i686

cflags-$(CONFIG_MCORE2)		+= -march=i686 $(call tune,core2)

cflags-$(CONFIG_MATOM)		+= $(call cc-option,-march=atom,$(call cc-option,-march=core2,-march=i686)) \

	$(call cc-option,-mtune=atom,$(call cc-option,-mtune=generic))



# AMD Elan support

cflags-$(CONFIG_X86_ELAN)	+= -march=i486

arch/x86/include/asm/module.h

+2 −0
Original line number Diff line number Diff line
@@ -28,6 +28,8 @@ struct mod_arch_specific {}; 
#define MODULE_PROC_FAMILY "586MMX "

#elif defined CONFIG_MCORE2

#define MODULE_PROC_FAMILY "CORE2 "

#elif defined CONFIG_MATOM

#define MODULE_PROC_FAMILY "ATOM "

#elif defined CONFIG_M686

#define MODULE_PROC_FAMILY "686 "

#elif defined CONFIG_MPENTIUMII