We can choose the -mcpu= gcc flags for compiling the kernel
based on the platform that we build for. In case of multiplatform
kernels, this chooses a setting for a common subset.
When using a platform type that can use different CPUs, a
new option CONFIG_PPC_CPU_SELECTION can be enabled to select
more specifically which CPUs the kernel will be able to
run on.
This replaces the CONFIG_POWER4_ONLY option with an much more
generic approach.
Also, when CONFIG_PPC_CPU_SELECTION is set, it is now possible
to select a CPU to tune for by means of the -mtune= option.
I tried to be very careful when coding the specific rules into
the Kconfig language, but it would be good to have a few
people sanity-checking them.
Signed-off-by: Arnd Bergmann <[EMAIL PROTECTED]>
Index: linux-2.6/arch/powerpc/platforms/52xx/Kconfig
===================================================================
--- linux-2.6.orig/arch/powerpc/platforms/52xx/Kconfig
+++ linux-2.6/arch/powerpc/platforms/52xx/Kconfig
@@ -25,12 +25,14 @@ config PPC_EFIKA
select RTAS_PROC
select PPC_MPC52xx
select PPC_NATIVE
+ select CPU_603e
default n
config PPC_LITE5200
bool "Freescale Lite5200 Eval Board"
depends on PPC_MULTIPLATFORM && PPC32
select PPC_MPC5200
+ select CPU_603e
default n
Index: linux-2.6/arch/powerpc/platforms/82xx/Kconfig
===================================================================
--- linux-2.6.orig/arch/powerpc/platforms/82xx/Kconfig
+++ linux-2.6/arch/powerpc/platforms/82xx/Kconfig
@@ -10,6 +10,7 @@ config MPC82xx_ADS
select 8272
select 8260
select FSL_SOC
+ select CPU_603e
help
This option enables support for the MPC8272 ADS board
Index: linux-2.6/arch/powerpc/platforms/83xx/Kconfig
===================================================================
--- linux-2.6.orig/arch/powerpc/platforms/83xx/Kconfig
+++ linux-2.6/arch/powerpc/platforms/83xx/Kconfig
@@ -6,6 +6,7 @@ choice
config MPC8313_RDB
bool "Freescale MPC8313 RDB"
select DEFAULT_UIMAGE
+ select CPU_603e
help
This option enables support for the MPC8313 RDB board.
@@ -13,6 +14,7 @@ config MPC832x_MDS
bool "Freescale MPC832x MDS"
select DEFAULT_UIMAGE
select QUICC_ENGINE
+ select CPU_603e
help
This option enables support for the MPC832x MDS evaluation board.
@@ -20,12 +22,14 @@ config MPC832x_RDB
bool "Freescale MPC832x RDB"
select DEFAULT_UIMAGE
select QUICC_ENGINE
+ select CPU_603e
help
This option enables support for the MPC8323 RDB board.
config MPC834x_MDS
bool "Freescale MPC834x MDS"
select DEFAULT_UIMAGE
+ select CPU_603e
help
This option enables support for the MPC 834x MDS evaluation board.
@@ -37,6 +41,7 @@ config MPC834x_MDS
config MPC834x_ITX
bool "Freescale MPC834x ITX"
select DEFAULT_UIMAGE
+ select CPU_603e
help
This option enables support for the MPC 834x ITX evaluation board.
@@ -47,6 +52,7 @@ config MPC836x_MDS
bool "Freescale MPC836x MDS"
select DEFAULT_UIMAGE
select QUICC_ENGINE
+ select CPU_603e
help
This option enables support for the MPC836x MDS Processor Board.
Index: linux-2.6/arch/powerpc/platforms/86xx/Kconfig
===================================================================
--- linux-2.6.orig/arch/powerpc/platforms/86xx/Kconfig
+++ linux-2.6/arch/powerpc/platforms/86xx/Kconfig
@@ -8,6 +8,7 @@ config MPC8641_HPCN
select PPC_I8259
select DEFAULT_UIMAGE
select FSL_ULI1575
+ select CPU_7450
help
This option enables support for the MPC8641 HPCN board.
Index: linux-2.6/arch/powerpc/platforms/Kconfig.cputype
===================================================================
--- linux-2.6.orig/arch/powerpc/platforms/Kconfig.cputype
+++ linux-2.6/arch/powerpc/platforms/Kconfig.cputype
@@ -53,14 +53,352 @@ config E200
endchoice
-config POWER4_ONLY
- bool "Optimize for POWER4"
+config PPC_CPU_SELECTION
+ bool "Advanced CPU selection"
+ help
+ The kernel can be built for a range of CPU types, which it
+ normally determines automatically from the platform types that
+ have been enabled. In order to optimized leaving out support
+ for the older CPUs or selecting the exact -mtune= option that
+ is passed to gcc, you can further optimize the kernel for a
+ particular system.
+
+ Selecting this option will not cause changes directly, but will
+ reveal further options.
+
+ If unsure, say N.
+
+config CPU_DEFAULT
+ bool "Don't specify -mcpu= to gcc" if PPC_CPU_SELECTION
+ help
+ When this option is selected, gcc is called without
+ any specific -mcpu= argument, regardless of which
+ CPUs are enabled in the next options.
+
+config CPU_RS64
+ bool "RS64" if PPC_CPU_SELECTION
depends on PPC64
- default n
- ---help---
- Cause the compiler to optimize for POWER4/POWER5/PPC970 processors.
- The resulting binary will not work on POWER3 or RS64 processors
- when compiled with binutils 2.15 or later.
+ default y if PPC_PSERIES || PPC_ISERIES
+ help
+ Select this if you want to have support for the first
+ generation of 64 bit PowerPC CPUs used in the late
+ 1990s in IBM RS/6000 and AS/400 machines.
+
+config CPU_POWER3
+ bool "IBM Power3" if PPC_CPU_SELECTION
+ depends on PPC64
+ default y if PPC_PSERIES
+ help
+ Select this if you want to have support for the
+ Power3 chip used in IBM RS/6000 and early pSeries
+ machines.
+
+config CPU_POWER4
+ bool "IBM Power4" if PPC_CPU_SELECTION
+ depends on PPC64
+ default y if PPC_PSERIES || PPC_ISERIES
+ help
+ Select this if you want to have support for the Power 4
+ processor used in IBM pSeries and iSeries machines.
+
+config CPU_POWER5
+ bool "IBM Power5" if PPC_CPU_SELECTION
+ depends on PPC64
+ default y if PPC_PSERIES
+ help
+ Select this if you want to have support for the Power 5
+ processor used in IBM System p and System i machines.
+
+config CPU_POWER6
+ bool "IBM Power6" if PPC_CPU_SELECTION
+ depends on PPC64
+ default y if PPC_PSERIES
+ select ALTIVEC
+ help
+ Select this if you want to have support for the Power 6
+ processor used in the latest IBM System p and System i
+ machines.
+
+config CPU_970
+ bool "IBM PowerPC 970 (G5)" if PPC_CPU_SELECTION
+ depends on PPC64
+ default y if PPC_PSERIES
+ select ALTIVEC
+ help
+ Select this if you want to have support for the PowerPC 970
+ processor used in Apple Power Macintosh G5 and IBM JS2x blade
+ servers and other systems.
+
+config CPU_CELL
+ bool "Sony/Toshiba/IBM Cell Broadband Engine" if PPC_CPU_SELECTION
+ depends on PPC64
+ select ALTIVEC
+ help
+ Select this if you want to have support for the Cell Broadband
+ Engine processor used the Sony Playstation 3, the IBM QS2x
+ blade servers and other systems.
+
+config CPU_PA6T
+ bool "PA Semi PA6T-1682M" if PPC_CPU_SELECTION
+ depends on PPC64
+ select ALTIVEC
+ help
+ Select this if you want to have support for the PA6T-1682M
+ processor from PA Semi.
+
+config CPU_601
+ bool "PowerPC 601 (G1)" if PPC_CPU_SELECTION
+ depends on 6xx
+ default PPC_CHRP || PPC_PREP
+ help
+ Select this if you really wish to have support for ancient PowerPC
+ 601 processors used in very early Power Macintosh machines and
+ some CHRP boards.
+ Most people will want to disable this option to get better
+ performance on modern machines.
+
+config CPU_603e
+ bool "PowerPC 603e, 604, 604e, 52xx, 82xx, 83xx (G2)" if
PPC_CPU_SELECTION
+ depends on 6xx
+ default PPC_CHRP || PPC_PREP || PPC_PMAC
+ help
+ The 603e processor line is the most widespread implementation of
+ the PowerPC ISA, so you most likely want to enable this if you are
+ building a kernel for multiple platforms.
+
+config CPU_750
+ bool "PowerPC 740, 750 (G3)" if PPC_CPU_SELECTION
+ depends on 6xx
+ default PPC_PMAC
+ help
+ Select this for the G3 PowerPC 750 processor used in Apple
+ Power Macintosh and a number of embedded boards.
+
+config CPU_7400
+ bool "PowerPC 7400, 7410 (G4)" if PPC_CPU_SELECTION
+ depends on 6xx
+ default PPC_PMAC
+ select ALTIVEC
+ help
+ Select this for the early G4 PowerPC 7400 processor used in
+ a few Apple Power Macintosh and other machines.
+
+config CPU_7450
+ bool "PowerPC 744x, 745x, 86xx (G4)" if PPC_CPU_SELECTION
+ depends on 6xx
+ default PPC_PMAC
+ select ALTIVEC
+ help
+ Select this for the later G4 PowerPC 7450 processor and its
+ derivatives used in most of the late Apple Power Macintosh
+ machines and some high-performance embedded boards.
+
+config CPU_8540
+ bool "Freescale e500v1 (MPC8540 compatible)" if PPC_CPU_SELECTION
+ depends on PPC_85xx
+ help
+ Select this for the older version 1 of the e500 core used in
+ the earlier MPC85xx processors.
+
+config CPU_8548
+ bool "Freescale e500v2 (MPC8548 compatible)" if PPC_CPU_SELECTION
+ depends on PPC_85xx
+ help
+ Select this for the newer version 2 of the e500 core that was
+ first used in the MPC8548 processor.
+ Some versions of gcc don't know about this yet, so you may
+ also have to enable 8540 to get the best performance with
+ your compiler.
+
+config CPU_403
+ bool "IBM 403" if PPC_CPU_SELECTION
+ depends on 40x
+ help
+ The PowerPC 403 core is used in the first generation Tivo and
+ some other old machines. Select this only if you are sure that
+ you want to run your kernel on one of these machines.
+
+config CPU_405
+ bool "IBM/AMCC 405" if PPC_CPU_SELECTION
+ depends on 40x
+ default y
+ help
+ Practically all PowerPC 40x based platforms supported by Linux use
+ a 405 core, so you should enable this option.
+
+config CPU_440
+ bool "IBM/AMCC 440" if PPC_CPU_SELECTION
+ depends on 44x
+ default y
+ help
+ If you are building for a PowerPC 440 based, you don't really
+ have a choice here, say Y.
+
+choice
+ prompt "Tune for processor type" if PPC_CPU_SELECTION
+ default TUNE_POWER4 if PPC64
+ default TUNE_DEFAULT
+ help
+ This will choose the gcc flag to use for the -mtune= parameter.
+ See the above list for a description of the invidual options.
+
+ If unsure, select TUNE_DEFAULT, gcc will tune for the oldest
+ CPU that the kernel supports in that case, which usually
+ gives reasonable results on newer CPUs as well.
+
+config TUNE_DEFAULT
+ bool "Don't specify -mtune= to gcc"
+
+config TUNE_RS64
+ bool "RS64"
+ depends on CPU_RS64
+
+config TUNE_POWER3
+ bool "IBM Power3"
+ depends on CPU_POWER3
+
+config TUNE_POWER4
+ bool "IBM Power4"
+ depends on CPU_POWER4
+
+config TUNE_POWER5
+ bool "IBM Power5"
+ depends on CPU_POWER5
+
+config TUNE_POWER6
+ bool "IBM Power6"
+ depends on CPU_POWER6
+
+config TUNE_970
+ bool "IBM PowerPC 970 (G5)"
+ depends on CPU_970
+
+config TUNE_CELL
+ bool "Sony/Toshiba/IBM Cell Broadband Engine"
+ depends on CPU_CELL
+
+config TUNE_PA6T
+ bool "PA Semi PA6T-1682M"
+ depends on CPU_PA6T
+
+config TUNE_601
+ bool "PowerPC 601 (G1)"
+ depends on CPU_601
+
+config TUNE_603e
+ bool "PowerPC 603e, 604, 604e, 52xx, 82xx, 83xx (G2)"
+ depends on CPU_603e
+
+config TUNE_750
+ bool "PowerPC 740/750 (G3)"
+ depends on CPU_750
+
+config TUNE_7400
+ bool "PowerPC 7400, 7410 (G4)"
+ depends on CPU_7400
+
+config TUNE_7450
+ bool "PowerPC 744x, 745x, 86xx (G4)"
+ depends on CPU_7450
+
+config TUNE_821
+ bool "Freescale MPC821"
+ depends on 8xx
+
+config TUNE_823
+ bool "Freescale MPC823"
+ depends on 8xx
+
+config TUNE_860
+ bool "Freescale MPC860"
+ depends on 8xx
+
+config TUNE_403
+ bool "IBM 403"
+ depends on CPU_403
+
+config TUNE_405
+ bool "IBM/AMCC 405"
+ depends on CPU_405
+
+config TUNE_440
+ bool "IBM/AMCC 440"
+ depends on CPU_440
+
+config TUNE_8540
+ bool "Freescale e500v1"
+ depends on CPU_8540
+
+config TUNE_8548
+ bool "Freescale e500v2"
+ depends on CPU_8548
+
+config TUNE_E200
+ bool "Freescale e200"
+ depends on E200
+
+endchoice
+
+config PPC_MCPU
+ string
+ default "" if CPU_DEFAULT
+ default "-mcpu=power3" if CPU_POWER3 || CPU_RS64
+ default "-mcpu=power4" if (CPU_POWER5 || CPU_POWER6) && (CPU_970 ||
CPU_CELL || CPU_PA6T)
+ default "-mcpu=power4" if CPU_POWER4
+ default "-mcpu=power5" if CPU_POWER5
+ default "-mcpu=power6" if CPU_POWER6
+ default "-mcpu=970" if CPU_970
+ default "-mcpu=cell" if CPU_CELL
+ default "-mcpu=pa6t" if CPU_PA6T
+ default "-mcpu=power3" if PPC64
+ default "-mcpu=powerpc" if CPU_601 && (CPU_603e || CPU_750 || CPU_7400
|| CPU_7450)
+ default "-mcpu=601" if CPU_601
+ default "-mcpu=603e" if CPU_603e
+ default "-mcpu=750" if CPU_750
+ default "-mcpu=7400" if CPU_7400
+ default "-mcpu=7450" if CPU_7450
+ default "-mcpu=8540" if CPU_8540
+ default "-mcpu=8548" if CPU_8548
+ default "-mcpu=powerpc" if (CPU_403 && CPU_405)
+ default "-mcpu=powerpc" if (CPU_403 || CPU_405) && CPU_440
+ default "-mcpu=403" if CPU_403
+ default "-mcpu=405" if CPU_405
+ default "-mcpu=440" if CPU_440
+ default "-mcpu=860" if PPC_8xx
+ default "-mcpu=e200" if E200
+ default "-mcpu=powerpc"
+
+config PPC_MTUNE
+ string
+ default "" if TUNE_DEFAULT
+ default "-mtune=power3" if TUNE_POWER3
+ default "-mtune=rs64a" if TUNE_RS64
+ default "-mtune=power4" if TUNE_POWER4
+ default "-mtune=power5" if TUNE_POWER5
+ default "-mtune=power6" if TUNE_POWER6
+ default "-mtune=970" if TUNE_970
+ default "-mtune=cell" if TUNE_CELL
+ default "-mtune=pa6t" if TUNE_PA6T
+ default "-mtune=601" if TUNE_601
+ default "-mtune=603e" if TUNE_603e
+ default "-mtune=750" if TUNE_750
+ default "-mtune=7400" if TUNE_7400
+ default "-mtune=7450" if TUNE_7450
+ default "-mtune=8540" if TUNE_8540
+ default "-mtune=8548" if TUNE_8548
+ default "-mtune=403" if TUNE_403
+ default "-mtune=405" if TUNE_405
+ default "-mtune=440" if TUNE_440
+ default "-mtune=821" if TUNE_821
+ default "-mtune=823" if TUNE_823
+ default "-mtune=860" if TUNE_860
+ default "-mtune=e200" if TUNE_E200
+ default "-mtune=power4" if PPC64
+
+# The next three options should probably go away
+config POWER4_ONLY
+ def_bool y
+ depends on PPC64 && !CPU_POWER3 && !CPU_RS64
config POWER3
bool
Index: linux-2.6/arch/powerpc/platforms/cell/Kconfig
===================================================================
--- linux-2.6.orig/arch/powerpc/platforms/cell/Kconfig
+++ linux-2.6/arch/powerpc/platforms/cell/Kconfig
@@ -20,6 +20,7 @@ config PPC_IBM_CELL_BLADE
select MMIO_NVRAM
select PPC_UDBG_16550
select UDBG_RTAS_CONSOLE
+ select CPU_CELL
menu "Cell Broadband Engine options"
depends on PPC_CELL
Index: linux-2.6/arch/powerpc/platforms/celleb/Kconfig
===================================================================
--- linux-2.6.orig/arch/powerpc/platforms/celleb/Kconfig
+++ linux-2.6/arch/powerpc/platforms/celleb/Kconfig
@@ -2,6 +2,7 @@ config PPC_CELLEB
bool "Toshiba's Cell Reference Set 'Celleb' Architecture"
depends on PPC_MULTIPLATFORM && PPC64
select PPC_CELL
+ select CPU_CELL
select PPC_OF_PLATFORM_PCI
select HAS_TXX9_SERIAL
select PPC_UDBG_BEAT
Index: linux-2.6/arch/powerpc/platforms/embedded6xx/Kconfig
===================================================================
--- linux-2.6.orig/arch/powerpc/platforms/embedded6xx/Kconfig
+++ linux-2.6/arch/powerpc/platforms/embedded6xx/Kconfig
@@ -8,6 +8,7 @@ config LINKSTATION
select FSL_SOC
select PPC_UDBG_16550 if SERIAL_8250
select DEFAULT_UIMAGE
+ select CPU_603e
help
Select LINKSTATION if configuring for one of PPC- (MPC8241)
based NAS systems from Buffalo Technology. So far only
@@ -20,6 +21,7 @@ config MPC7448HPC2
select TSI108_BRIDGE
select DEFAULT_UIMAGE
select PPC_UDBG_16550
+ select CPU_7450
help
Select MPC7448HPC2 if configuring for Freescale MPC7448HPC2 (Taiga)
platform
@@ -29,6 +31,7 @@ config PPC_HOLLY
select TSI108_BRIDGE
select PPC_UDBG_16550
select WANT_DEVICE_TREE
+ select CPU_750
help
Select PPC_HOLLY if configuring for an IBM 750GX/CL Eval
Board with TSI108/9 bridge (Hickory/Holly)
@@ -38,6 +41,7 @@ config PPC_PRPMC2800
select MV64X60
select NOT_COHERENT_CACHE
select WANT_DEVICE_TREE
+ select CPU_7450
help
This option enables support for the Motorola PrPMC2800 board
endchoice
Index: linux-2.6/arch/powerpc/platforms/maple/Kconfig
===================================================================
--- linux-2.6.orig/arch/powerpc/platforms/maple/Kconfig
+++ linux-2.6/arch/powerpc/platforms/maple/Kconfig
@@ -11,6 +11,7 @@ config PPC_MAPLE
select PPC_RTAS
select MMIO_NVRAM
select ATA_NONSTANDARD if ATA
+ select CPU_970
default n
help
This option enables support for the Maple 970FX Evaluation Board.
Index: linux-2.6/arch/powerpc/platforms/pasemi/Kconfig
===================================================================
--- linux-2.6.orig/arch/powerpc/platforms/pasemi/Kconfig
+++ linux-2.6/arch/powerpc/platforms/pasemi/Kconfig
@@ -2,6 +2,7 @@ config PPC_PASEMI
depends on PPC_MULTIPLATFORM && PPC64
bool "PA Semi SoC-based platforms"
default n
+ select CPU_PA6T
select MPIC
select PPC_UDBG_16550
select PPC_NATIVE
Index: linux-2.6/arch/powerpc/platforms/powermac/Kconfig
===================================================================
--- linux-2.6.orig/arch/powerpc/platforms/powermac/Kconfig
+++ linux-2.6/arch/powerpc/platforms/powermac/Kconfig
@@ -16,6 +16,7 @@ config PPC_PMAC64
select MPIC_U3_HT_IRQS
select GENERIC_TBSYNC
select PPC_970_NAP
+ select CPU_970
default y
Index: linux-2.6/arch/powerpc/platforms/ps3/Kconfig
===================================================================
--- linux-2.6.orig/arch/powerpc/platforms/ps3/Kconfig
+++ linux-2.6/arch/powerpc/platforms/ps3/Kconfig
@@ -2,6 +2,7 @@ config PPC_PS3
bool "Sony PS3"
depends on PPC_MULTIPLATFORM && PPC64
select PPC_CELL
+ select CPU_CELL
select USB_ARCH_HAS_OHCI
select USB_OHCI_LITTLE_ENDIAN
select USB_OHCI_BIG_ENDIAN_MMIO
Index: linux-2.6/arch/powerpc/Makefile
===================================================================
--- linux-2.6.orig/arch/powerpc/Makefile
+++ linux-2.6/arch/powerpc/Makefile
@@ -74,24 +74,23 @@ CPP = $(CC) -E $(CFLAGS)
CHECKFLAGS += -m$(SZ) -D__powerpc__ -D__powerpc$(SZ)__
+OPTFLAGS := $(call cc-option,$(CONFIG_PPC_MCPU)) $(call
cc-option,$(CONFIG_PPC_MTUNE))
+
+# compilers older than 4.0.0 can only set -maltivec in 64 bit mode
+# when compiling for 970
ifeq ($(CONFIG_PPC64),y)
GCC_BROKEN_VEC := $(shell if [ $(call cc-version) -lt 0400 ] ; then echo "y";
fi)
-
ifeq ($(CONFIG_POWER4_ONLY),y)
ifeq ($(CONFIG_ALTIVEC),y)
ifeq ($(GCC_BROKEN_VEC),y)
- CFLAGS += $(call cc-option,-mcpu=970)
-else
- CFLAGS += $(call cc-option,-mcpu=power4)
+ OPTFLAGS := $(call cc-option,-mcpu=970) $(call
cc-option,$(CONFIG_PPC_MTUNE))
endif
-else
- CFLAGS += $(call cc-option,-mcpu=power4)
endif
-else
- CFLAGS += $(call cc-option,-mtune=power4)
endif
endif
+CFLAGS += $(OPTFLAGS)
+
# No AltiVec instruction when building kernel
CFLAGS += $(call cc-option,-mno-altivec)
@@ -103,10 +102,6 @@ CFLAGS += $(call cc-option,-funit-at-a-t
# often slow when they are implemented at all
CFLAGS += -mno-string
-ifeq ($(CONFIG_6xx),y)
-CFLAGS += -mcpu=powerpc
-endif
-
cpu-as-$(CONFIG_4xx) += -Wa,-m405
cpu-as-$(CONFIG_6xx) += -Wa,-maltivec
cpu-as-$(CONFIG_POWER4) += -Wa,-maltivec
Index: linux-2.6/arch/powerpc/platforms/85xx/Kconfig
===================================================================
--- linux-2.6.orig/arch/powerpc/platforms/85xx/Kconfig
+++ linux-2.6/arch/powerpc/platforms/85xx/Kconfig
@@ -6,12 +6,14 @@ choice
config MPC8540_ADS
bool "Freescale MPC8540 ADS"
select DEFAULT_UIMAGE
+ select CPU_8540
help
This option enables support for the MPC 8540 ADS board
config MPC8560_ADS
bool "Freescale MPC8560 ADS"
select DEFAULT_UIMAGE
+ select CPU_8548
help
This option enables support for the MPC 8560 ADS board
@@ -19,6 +21,7 @@ config MPC85xx_CDS
bool "Freescale MPC85xx CDS"
select DEFAULT_UIMAGE
select PPC_I8259
+ select CPU_8548
help
This option enables support for the MPC85xx CDS board
@@ -26,6 +29,7 @@ config MPC85xx_MDS
bool "Freescale MPC85xx MDS"
select DEFAULT_UIMAGE
# select QUICC_ENGINE
+ select CPU_8548
help
This option enables support for the MPC85xx MDS board
@@ -34,6 +38,7 @@ config MPC8544_DS
select PPC_I8259
select DEFAULT_UIMAGE
select FSL_ULI1575
+ select CPU_8548
help
This option enables support for the MPC8544 DS board
--
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