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| author |   Richard Purdie <richard.purdie@linuxfoundation.org> | 2011-07-25 19:03:24 +0100 |
|---|---|---|
| committer | Richard Purdie <richard.purdie@linuxfoundation.org> | 2011-07-27 15:43:38 +0100 |
| commit | 789dcb8e68a2ab9784ac10ab36815010c61af2fc (patch) | |
| tree | e0930a7f1900bc907a2bd3e372d20512e4328fe3 /meta/conf/machine/include/arm/feature-arm-thumb.inc | |
| parent | c64d075b3d367e6c76aafa17782585d026b1f31e (diff) | |
| download | openembedded-core-contrib-789dcb8e68a2ab9784ac10ab36815010c61af2fc.tar.gz | |
Add ARM tune file overhaul based largely on work from Mark Hatle
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
Diffstat (limited to 'meta/conf/machine/include/arm/feature-arm-thumb.inc')
| -rw-r--r-- | meta/conf/machine/include/arm/feature-arm-thumb.inc | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/meta/conf/machine/include/arm/feature-arm-thumb.inc b/meta/conf/machine/include/arm/feature-arm-thumb.inc new file mode 100644 index 0000000000..b5801687fa --- /dev/null +++ b/meta/conf/machine/include/arm/feature-arm-thumb.inc @@ -0,0 +1,25 @@ +# The instruction set the compiler should use when generating application +# code. The kernel is always compiled with arm code at present. arm code +# is the original 32 bit ARM instruction set, thumb code is the 16 bit +# encoded RISC sub-set. Thumb code is smaller (maybe 70% of the ARM size) +# but requires more instructions (140% for 70% smaller code) so may be +# slower. +TUNEVALID[thumb] = "Use thumb instructions instead of ARM" +TUNE_CCARGS += "${@bb.utils.contains("TUNE_FEATURES", "thumb", "-mthumb", "-mno-thumb", d)}" +OVERRIDES .= "${@bb.utils.contains("TUNE_FEATURES", "thumb", ":thumb", "", d)}" + +# Note armv7 will hit on armv7a as well +ARMPKGSFX_THUMB .= "${@bb.utils.contains("TUNE_FEATURES", [ "armv4", "thumb" ], "t", "", d)}" +ARMPKGSFX_THUMB .= "${@bb.utils.contains("TUNE_FEATURES", [ "armv5", "thumb" ], "t", "", d)}" +ARMPKGSFX_THUMB .= "${@bb.utils.contains("TUNE_FEATURES", [ "armv6", "thumb" ], "t", "", d)}" +ARMPKGSFX_THUMB .= "${@bb.utils.contains("TUNE_FEATURES", [ "armv7", "thumb" ], "t2", "", d)}" + +# Whether to compile with code to allow interworking between the two +# instruction sets. This allows thumb code to be executed on a primarily +# arm system and vice versa. It is strongly recommended that DISTROs not +# turn this off - the actual cost is very small. +TUNEVALID[no-thumb-interwork] = "Disable mixing of thumb and ARM functions" +TUNE_CCARGS += "${@bb.utils.contains("TUNE_FEATURES", "no-thumb-interwork", "-mno-thumb-interwork", "-mthumb-interwork", d)}" +OVERRIDES .= "${@bb.utils.contains("TUNE_FEATURES", "no-thumb-interwork", ":thumb-interwork", "", d)}" + +TARGET_CC_KERNEL_ARCH += "-mno-thumb-interwork -mno-thumb" |