diff options
| author | Cyril Bur <cyrilbur@gmail.com> | 2016-02-29 07:53:50 +0100 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2016-03-02 13:34:49 +0100 |
| commit | 6f515d842e8e1b205e54f44b9013bf14870b97a7 (patch) | |
| tree | 34f133da5b1cd6922f2728645db025bcc81b4183 /arch/powerpc/kernel/vector.S | |
| parent | powerpc: Add the ability to save FPU without giving it up (diff) | |
| download | linux-6f515d842e8e1b205e54f44b9013bf14870b97a7.tar.xz linux-6f515d842e8e1b205e54f44b9013bf14870b97a7.zip | |
powerpc: Add the ability to save Altivec without giving it up
This patch adds the ability to be able to save the VEC 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 registers in the
thread copy path to avoid a possibly pointless reload of VEC 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 | 24 |
1 files changed, 4 insertions, 20 deletions
diff --git a/arch/powerpc/kernel/vector.S b/arch/powerpc/kernel/vector.S index 038cff8cf5f2..51b0c175ea8c 100644 --- a/arch/powerpc/kernel/vector.S +++ b/arch/powerpc/kernel/vector.S @@ -106,36 +106,20 @@ _GLOBAL(load_up_altivec) blr /* - * __giveup_altivec(tsk) - * Disable VMX for the task given as the argument, - * and save the vector registers in its thread_struct. + * save_altivec(tsk) + * Save the vector registers to its thread_struct */ -_GLOBAL(__giveup_altivec) +_GLOBAL(save_altivec) addi r3,r3,THREAD /* want THREAD of task */ PPC_LL r7,THREAD_VRSAVEAREA(r3) PPC_LL r5,PT_REGS(r3) PPC_LCMPI 0,r7,0 bne 2f addi r7,r3,THREAD_VRSTATE -2: PPC_LCMPI 0,r5,0 - SAVE_32VRS(0,r4,r7) +2: SAVE_32VRS(0,r4,r7) mfvscr v0 li r4,VRSTATE_VSCR stvx v0,r4,r7 - beq 1f - PPC_LL r4,_MSR-STACK_FRAME_OVERHEAD(r5) -#ifdef CONFIG_VSX -BEGIN_FTR_SECTION - lis r3,(MSR_VEC|MSR_VSX)@h -FTR_SECTION_ELSE - lis r3,MSR_VEC@h -ALT_FTR_SECTION_END_IFSET(CPU_FTR_VSX) -#else - lis r3,MSR_VEC@h -#endif - andc r4,r4,r3 /* disable FP for previous task */ - PPC_STL r4,_MSR-STACK_FRAME_OVERHEAD(r5) -1: blr #ifdef CONFIG_VSX |