diff options
| author | Anton Blanchard <anton@samba.org> | 2015-10-29 11:44:06 +1100 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2015-12-01 13:52:26 +1100 |
| commit | 3eb5d5888dc68c9b187998ca4249b8b9fa481eeb (patch) | |
| tree | 16c17e1867d56207321c404f361c1115aac6320e /arch/powerpc/include/asm/reg.h | |
| parent | dc4fbba11e4661a6a77a1f89ba32f9082e6395ff (diff) | |
powerpc: Add ppc_strict_facility_enable boot option
Add a boot option that strictly manages the MSR unavailable bits.
This catches kernel uses of FP/Altivec/SPE that would otherwise
corrupt user state.
Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/include/asm/reg.h')
| -rw-r--r-- | arch/powerpc/include/asm/reg.h | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/reg.h b/arch/powerpc/include/asm/reg.h index 987dac090244..eb2986e60c50 100644 --- a/arch/powerpc/include/asm/reg.h +++ b/arch/powerpc/include/asm/reg.h @@ -1214,6 +1214,15 @@ static inline void mtmsr_isync(unsigned long val) : "r" ((unsigned long)(v)) \ : "memory") +extern void msr_check_and_set(unsigned long bits); +extern bool strict_msr_control; +extern void __msr_check_and_clear(unsigned long bits); +static inline void msr_check_and_clear(unsigned long bits) +{ + if (strict_msr_control) + __msr_check_and_clear(bits); +} + static inline unsigned long mfvtb (void) { #ifdef CONFIG_PPC_BOOK3S_64 |