Messages in this thread Patch in this message | | | From | Tobias Doerffel <> | Subject | Specific support for Intel Atom architecture | Date | Thu, 30 Apr 2009 14:08:04 +0200 |
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Hi,
as some of you already might know, work is going on to make GCC fully support Intel Atom architecture specifics, i.e. make -mtune=atom generate code optimized for in-order architectures like Intel Atom [1].
I therefore started to make up a small patch which adds Intel Atom as a new processor family which can be selected upon configuration. It's nothing special and also requires a patched GCC. I'd just like to get some feedback on it, i.e. is X86_L1_CACHE_SHIFT=6 ok for Atom CPUs (I was not able to find any information on Atom's cacheline size)? Any chance to include this patch once the Atom patch went into GCC mainline (probably in GCC 4.5)? Any other objections?
Please Cc me, I'm not on the list.
Regards,
Tobias
[1] http://gcc.gnu.org/viewcvs/branches/ix86/atom/
From 6aa86b4431619d38849d469c70904afe1e5a8ca0 Mon Sep 17 00:00:00 2001 From: Tobias Doerffel <tobias.doerffel@gmail.com> Date: Thu, 30 Apr 2009 12:36:46 +0200 Subject: [PATCH] x86: add specific support for Intel Atom architecture
This adds another option when selecting CPU family so the kernel can be optimized for Intel Atom CPUs. This patch requires a GCC with a patch applied which adds specific Intel Atom support. --- arch/x86/Kconfig.cpu | 19 ++++++++++++++----- arch/x86/Makefile_32.cpu | 1 + arch/x86/include/asm/module.h | 2 ++ 3 files changed, 17 insertions(+), 5 deletions(-)
diff --git a/arch/x86/Kconfig.cpu b/arch/x86/Kconfig.cpu index 8130334..8e565b7 100644 --- a/arch/x86/Kconfig.cpu +++ b/arch/x86/Kconfig.cpu @@ -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" + depends on X86_32 + ---help--- + + Select this for Intel Atom platform. Intel Atom CPUs have an in-order + pipelining architecture and thus can benefit from in-order optimized + code (requires Intel Atom patch in GCC). + config GENERIC_CPU bool "Generic-x86-64" depends on X86_64 @@ -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 @@ -355,11 +364,11 @@ config X86_ALIGNMENT_16 config X86_INTEL_USERCOPY def_bool y - depends on MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M586MMX || X86_GENERIC || MK8 || MK7 || MEFFICEON || MCORE2 + depends on MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M586MMX || X86_GENERIC || MK8 || MK7 || MEFFICEON || MCORE2 || MATOM 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 diff --git a/arch/x86/Makefile_32.cpu b/arch/x86/Makefile_32.cpu index 80177ec..07a11b0 100644 --- a/arch/x86/Makefile_32.cpu +++ b/arch/x86/Makefile_32.cpu @@ -33,6 +33,7 @@ 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) += -march=atom $(call tune,atom) # AMD Elan support cflags-$(CONFIG_X86_ELAN) += -march=i486 diff --git a/arch/x86/include/asm/module.h b/arch/x86/include/asm/module.h index 47d6274..e959c4a 100644 --- a/arch/x86/include/asm/module.h +++ b/arch/x86/include/asm/module.h @@ -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 -- 1.6.2.4 [unhandled content-type:application/pgp-signature] | |