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| author |   Cyril Bur <cyrilbur@gmail.com> | 2016-02-29 17:53:51 +1100 |
|---|---|---|
| committer |   Michael Ellerman <mpe@ellerman.id.au> | 2016-03-02 23:34:50 +1100 |
| commit | bf6a4d5b75d1ea87897fe68d0e45d35a2996c678 (patch) | |
| tree | 8e967bdd1fe1dcd8bda0b38baa212c945c40cab1 /arch/powerpc/kernel/vector.S | |
| parent | powerpc: Add the ability to save Altivec without giving it up (diff) | |
| download | linux-dev-bf6a4d5b75d1ea87897fe68d0e45d35a2996c678.tar.xz linux-dev-bf6a4d5b75d1ea87897fe68d0e45d35a2996c678.zip | |
powerpc: Add the ability to save VSX without giving it up
This patch adds the ability to be able to save the VSX registers to the
thread struct without giving up (disabling the facility) next time the
process returns to userspace.
This patch builds on a previous optimisation for the FPU and VEC registers
in the thread copy path to avoid a possibly pointless reload of VSX state.
Signed-off-by: Cyril Bur <cyrilbur@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/kernel/vector.S')
| -rw-r--r-- | arch/powerpc/kernel/vector.S | 17 |
1 files changed, 0 insertions, 17 deletions
diff --git a/arch/powerpc/kernel/vector.S b/arch/powerpc/kernel/vector.S index 51b0c175ea8c..1c2e7a343bf5 100644 --- a/arch/powerpc/kernel/vector.S +++ b/arch/powerpc/kernel/vector.S @@ -151,23 +151,6 @@ _GLOBAL(load_up_vsx) std r12,_MSR(r1) b fast_exception_return -/* - * __giveup_vsx(tsk) - * Disable VSX for the task given as the argument. - * Does NOT save vsx registers. - */ -_GLOBAL(__giveup_vsx) - addi r3,r3,THREAD /* want THREAD of task */ - ld r5,PT_REGS(r3) - cmpdi 0,r5,0 - beq 1f - ld r4,_MSR-STACK_FRAME_OVERHEAD(r5) - lis r3,MSR_VSX@h - andc r4,r4,r3 /* disable VSX for previous task */ - std r4,_MSR-STACK_FRAME_OVERHEAD(r5) -1: - blr - #endif /* CONFIG_VSX */ |