This patch adds CPU selection to Kconfig.cputype. I did my best to make
oldconfig
happy, but some things just don't work ;-) Maybe more CPUs and help texts can
be
added, but it should be enough for now.
Subject: [PATCH 1/2] [PPC64] add tuning options to Kconfig.cputype
---
arch/powerpc/platforms/Kconfig.cputype | 133 ++++++++++++++++++++++++++++---
1 files changed, 120 insertions(+), 13 deletions(-)
diff --git a/arch/powerpc/platforms/Kconfig.cputype
b/arch/powerpc/platforms/Kconfig.cputype
index 7f65127..f528748 100644
--- a/arch/powerpc/platforms/Kconfig.cputype
+++ b/arch/powerpc/platforms/Kconfig.cputype
@@ -56,8 +56,127 @@ config E200
endchoice
+config TUNE_OPT_CPU
+ depends on PPC64
+ def_bool n
+ prompt "Tune/optimize for a specific CPU"
+ help
+ This option enables a sub-menu where you can choose a certain
+ CPU to tune (via -mtune) or optimize (via -mcpu) for.
+
+choice
+ depends on TUNE_OPT_CPU
+ prompt "Choose the CPU to tune for"
+ default TUNE_POWER4
+ help
+ Choosing this will make the code run faster on the selected CPU,
+ but somehow slower on others.
+
+ This option only changes the scheduling of instructions, not the
+ selection of instructions itself, so the resulting kernel will keep
+ running on all other machines.
+
+ The default is to tune for power4.
+
+config TUNE_RS64
+ bool "RS64"
+
+config TUNE_POWER3
+ bool "POWER3"
+
+config TUNE_POWER4
+ bool "POWER4/G5/970"
+ help
+ Cause the compiler to tune for the POWER4 and derivates CPUS, like
+ G5 and other PPC970 variants.
+
+config TUNE_POWER5
+ bool "POWER5"
+
+config TUNE_POWER6
+ bool "POWER6"
+
+config TUNE_CELL
+ bool "Cell Broadband Engine"
+ help
+ Cause the compiler to optimize for the PPE of the Cell Broadband
+ Engine. This will make the code run considerably faster on Cell
+ but somewhat slower on other machines. This option only changes
+ the scheduling of instructions, not the selection of instructions
+ itself, so the resulting kernel will keep running on all other
+ machines.
+
+endchoice
+
+choice
+ depends on TUNE_OPT_CPU
+ default OPT_NONE
+ prompt "Choose the CPU to optimize for"
+ help
+ Choosing this will make the code run significant faster on the
+ selected CPU by selecting the scheduling and the instruction set
+ for the specific CPU. It will propably not run on earlier gernerations
+ but should run on newer ones.
+
+ The default is not to optimize for a specific CPU.
+
+config OPT_NONE
+ bool "none"
+
+config OPT_RS64
+ bool "RS64"
+
+config OPT_POWER3
+ bool "POWER3"
+ select POWER3
+
+config OPT_POWER4
+ bool "POWER4"
+ select POWER4_ONLY
+ ---help---
+ Cause the compiler to optimize for POWER4 processors. The resulting
+ binary will not work on POWER3 or RS64 processors when compiled
+ with binutils 2.15 or later.
+
+config OPT_PPC970
+ bool "G5/PPC970"
+ select POWER4_ONLY
+
+config OPT_POWER5
+ bool "POWER5"
+ select POWER4_ONLY
+
+config OPT_POWER6
+ bool "POWER6"
+ select POWER4_ONLY
+
+endchoice
+
+config OPT_CPU
+ depends on PPC64
+ string
+ default "rs64" if OPT_RS64
+ default "power3" if OPT_POWER3
+ default "power4" if OPT_POWER4
+ default "970" if OPT_PPC970
+ default "power5" if OPT_POWER5
+ default "power6" if OPT_POWER6
+ default "cell" if OPT_CELL
+ default ""
+
+config TUNE_CPU
+ depends on PPC64
+ string
+ default "rs64" if TUNE_RS64
+ default "power3" if TUNE_POWER3
+ default "power5" if TUNE_POWER5
+ default "power6" if TUNE_POWER6
+ default "cell" if TUNE_CELL
+ default "power4"
+
config POWER4_ONLY
- bool "Optimize for POWER4"
+ bool
+ prompt "Optimize for POWER4" if !TUNE_OPT_CPU
depends on PPC64
default n
---help---
@@ -74,18 +193,6 @@ config POWER4
depends on PPC64
def_bool y
-config TUNE_CELL
- bool "Optimize for Cell Broadband Engine"
- depends on PPC64
- help
- Cause the compiler to optimize for the PPE of the Cell Broadband
- Engine. This will make the code run considerably faster on Cell
- but somewhat slower on other machines. This option only changes
- the scheduling of instructions, not the selection of instructions
- itself, so the resulting kernel will keep running on all other
- machines. When building a kernel that is supposed to run only
- on Cell, you should also select the POWER4_ONLY option.
-
# this is temp to handle compat with arch=ppc
config 8xx
bool
--
1.5.6.2
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