From: Anton Blanchard <anton@samba.org>
To: benh@kernel.crashing.org, paulus@samba.org
Cc: linuxppc-dev@lists.ozlabs.org
Subject: [PATCH 3/4] powerpc: Add 64-bit CPU targets for gcc
Date: Wed, 18 Apr 2012 14:45:28 +1000 [thread overview]
Message-ID: <20120418144528.65b70fbb@kryten> (raw)
In-Reply-To: <20120418144254.3286ce94@kryten>
Add a menu to select various 64-bit CPU targets for gcc. We
default to -mtune=power7 and if gcc doesn't understand that we
fallback to -mtune=power4.
Signed-off-by: Anton Blanchard <anton@samba.org>
---
Index: linux-build/arch/powerpc/Makefile
===================================================================
--- linux-build.orig/arch/powerpc/Makefile 2012-04-18 14:31:31.614666419 +1000
+++ linux-build/arch/powerpc/Makefile 2012-04-18 14:37:08.680708678 +1000
@@ -69,6 +69,16 @@ LDFLAGS_vmlinux := $(LDFLAGS_vmlinux-y)
CFLAGS-$(CONFIG_PPC64) := -mminimal-toc -mtraceback=no -mcall-aixdesc
CFLAGS-$(CONFIG_PPC32) := -ffixed-r2 -mmultiple
+
+CFLAGS-$(CONFIG_GENERIC_CPU) += $(call cc-option,-mtune=power7,-mtune=power4)
+CFLAGS-$(CONFIG_CELL_CPU) += $(call cc-option,-mcpu=cell)
+CFLAGS-$(CONFIG_POWER4_CPU) += $(call cc-option,-mcpu=power4)
+CFLAGS-$(CONFIG_POWER5_CPU) += $(call cc-option,-mcpu=power5)
+CFLAGS-$(CONFIG_POWER6_CPU) += $(call cc-option,-mcpu=power6)
+CFLAGS-$(CONFIG_POWER7_CPU) += $(call cc-option,-mcpu=power7)
+
+CFLAGS-$(CONFIG_TUNE_CELL) += $(call cc-option,-mtune=cell)
+
KBUILD_CPPFLAGS += -Iarch/$(ARCH)
KBUILD_AFLAGS += -Iarch/$(ARCH)
KBUILD_CFLAGS += -msoft-float -pipe -Iarch/$(ARCH) $(CFLAGS-y)
@@ -76,22 +86,11 @@ CPP = $(CC) -E $(KBUILD_CFLAGS)
CHECKFLAGS += -m$(CONFIG_WORD_SIZE) -D__powerpc__ -D__powerpc$(CONFIG_WORD_SIZE)__
-ifeq ($(CONFIG_PPC64),y)
-ifeq ($(CONFIG_POWER4_ONLY),y)
- KBUILD_CFLAGS += $(call cc-option,-mcpu=power4)
-else
- KBUILD_CFLAGS += $(call cc-option,-mtune=power4)
-endif
-endif
-
KBUILD_LDFLAGS_MODULE += arch/powerpc/lib/crtsavres.o
-ifeq ($(CONFIG_TUNE_CELL),y)
- KBUILD_CFLAGS += $(call cc-option,-mtune=cell)
-endif
-
-# No AltiVec instruction when building kernel
+# No AltiVec or VSX instructions when building kernel
KBUILD_CFLAGS += $(call cc-option,-mno-altivec)
+KBUILD_CFLAGS += $(call cc-option,-mno-vsx)
# No SPE instruction when building kernel
# (We use all available options to help semi-broken compilers)
Index: linux-build/arch/powerpc/platforms/Kconfig.cputype
===================================================================
--- linux-build.orig/arch/powerpc/platforms/Kconfig.cputype 2012-04-18 14:31:25.134549903 +1000
+++ linux-build/arch/powerpc/platforms/Kconfig.cputype 2012-04-18 14:36:40.576207829 +1000
@@ -78,6 +78,36 @@ config PPC_BOOK3E_64
endchoice
+choice
+ prompt "CPU selection"
+ depends on PPC64
+ default GENERIC_CPU
+ help
+ This will create a kernel which is optimised for a particular CPU.
+ The resulting kernel may not run on other CPUs, so use this with care.
+
+ If unsure, select Generic.
+
+config GENERIC_CPU
+ bool "Generic"
+
+config CELL_CPU
+ bool "Cell Broadband Engine"
+
+config POWER4_CPU
+ bool "POWER4"
+
+config POWER5_CPU
+ bool "POWER5"
+
+config POWER6_CPU
+ bool "POWER6"
+
+config POWER7_CPU
+ bool "POWER7"
+
+endchoice
+
config PPC_BOOK3S
def_bool y
depends on PPC_BOOK3S_32 || PPC_BOOK3S_64
next prev parent reply other threads:[~2012-04-18 4:45 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-04-18 4:42 [PATCH 1/4] powerpc: Require gcc 4.0 on 64-bit Anton Blanchard
2012-04-18 4:44 ` [PATCH 2/4] powerpc: Remove altivec fix for gcc versions before 4.0 Anton Blanchard
2012-04-18 4:45 ` Anton Blanchard [this message]
2012-04-18 14:33 ` [PATCH 3/4] powerpc: Add 64-bit CPU targets for gcc Kumar Gala
2012-04-30 5:57 ` Benjamin Herrenschmidt
2012-04-18 4:46 ` [PATCH 4/4] powerpc: Remove CONFIG_POWER4_ONLY Anton Blanchard
2012-04-18 6:46 ` Benjamin Herrenschmidt
2012-04-18 6:51 ` Anton Blanchard
2012-04-18 6:57 ` Benjamin Herrenschmidt
2012-04-18 12:21 ` Anton Blanchard
2012-04-18 14:28 ` [PATCH 1/4] powerpc: Require gcc 4.0 on 64-bit Kumar Gala
2012-04-18 22:17 ` Benjamin Herrenschmidt
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