diff options
Diffstat (limited to 'arch/x86/kernel/cpu/mtrr/generic.c')
| -rw-r--r-- | arch/x86/kernel/cpu/mtrr/generic.c | 26 |
1 files changed, 19 insertions, 7 deletions
diff --git a/arch/x86/kernel/cpu/mtrr/generic.c b/arch/x86/kernel/cpu/mtrr/generic.c index 2f3fc28e5e02..0db0770e75f6 100644 --- a/arch/x86/kernel/cpu/mtrr/generic.c +++ b/arch/x86/kernel/cpu/mtrr/generic.c @@ -716,6 +716,21 @@ static unsigned long set_mtrr_state(void) return change_mask; } +void mtrr_disable(void) +{ + /* Save MTRR state */ + rdmsr(MSR_MTRRdefType, deftype_lo, deftype_hi); + + /* Disable MTRRs, and set the default type to uncached */ + mtrr_wrmsr(MSR_MTRRdefType, deftype_lo & ~0xcff, deftype_hi); +} + +void mtrr_enable(void) +{ + /* Intel (P6) standard MTRRs */ + mtrr_wrmsr(MSR_MTRRdefType, deftype_lo, deftype_hi); +} + /* * Disable and enable caches. Needed for changing MTRRs and the PAT MSR. * @@ -764,11 +779,8 @@ void cache_disable(void) __acquires(cache_disable_lock) count_vm_tlb_event(NR_TLB_LOCAL_FLUSH_ALL); flush_tlb_local(); - /* Save MTRR state */ - rdmsr(MSR_MTRRdefType, deftype_lo, deftype_hi); - - /* Disable MTRRs, and set the default type to uncached */ - mtrr_wrmsr(MSR_MTRRdefType, deftype_lo & ~0xcff, deftype_hi); + if (cpu_feature_enabled(X86_FEATURE_MTRR)) + mtrr_disable(); /* Again, only flush caches if we have to. */ if (!static_cpu_has(X86_FEATURE_SELFSNOOP)) @@ -781,8 +793,8 @@ void cache_enable(void) __releases(cache_disable_lock) count_vm_tlb_event(NR_TLB_LOCAL_FLUSH_ALL); flush_tlb_local(); - /* Intel (P6) standard MTRRs */ - mtrr_wrmsr(MSR_MTRRdefType, deftype_lo, deftype_hi); + if (cpu_feature_enabled(X86_FEATURE_MTRR)) + mtrr_enable(); /* Enable caches */ write_cr0(read_cr0() & ~X86_CR0_CD); |