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| author | Michael Neuling <mikey@neuling.org> | 2008-06-25 14:07:18 +1000 |
|---|---|---|
| committer | Paul Mackerras <paulus@samba.org> | 2008-07-01 11:28:50 +1000 |
| commit | ce48b2100785e5ca629fb3aa8e3b50aca808f692 (patch) | |
| tree | 63532ff7cc68b18ca4902bd10e03fcbaaf01cade /arch/powerpc/kernel/entry_64.S | |
| parent | 72ffff5b1792b0fa4d40a8e2f3276fff999820ec (diff) | |
| download | lwn-ce48b2100785e5ca629fb3aa8e3b50aca808f692.tar.gz lwn-ce48b2100785e5ca629fb3aa8e3b50aca808f692.zip | |
powerpc: Add VSX context save/restore, ptrace and signal support
This patch extends the floating point save and restore code to use the
VSX load/stores when VSX is available. This will make FP context
save/restore marginally slower on FP only code, when VSX is available,
as it has to load/store 128bits rather than just 64bits.
Mixing FP, VMX and VSX code will get constant architected state.
The signals interface is extended to enable access to VSR 0-31
doubleword 1 after discussions with tool chain maintainers. Backward
compatibility is maintained.
The ptrace interface is also extended to allow access to VSR 0-31 full
registers.
Signed-off-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'arch/powerpc/kernel/entry_64.S')
| -rw-r--r-- | arch/powerpc/kernel/entry_64.S | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/entry_64.S b/arch/powerpc/kernel/entry_64.S index 6ca3044e2e32..12eb95a80ce9 100644 --- a/arch/powerpc/kernel/entry_64.S +++ b/arch/powerpc/kernel/entry_64.S @@ -353,6 +353,11 @@ _GLOBAL(_switch) mflr r20 /* Return to switch caller */ mfmsr r22 li r0, MSR_FP +#ifdef CONFIG_VSX +BEGIN_FTR_SECTION + oris r0,r0,MSR_VSX@h /* Disable VSX */ +END_FTR_SECTION_IFSET(CPU_FTR_VSX) +#endif /* CONFIG_VSX */ #ifdef CONFIG_ALTIVEC BEGIN_FTR_SECTION oris r0,r0,MSR_VEC@h /* Disable altivec */ |