diff options
Diffstat (limited to 'src/cpu/x86/mtrr/mtrr.c')
| -rw-r--r-- | src/cpu/x86/mtrr/mtrr.c | 30 |
1 files changed, 29 insertions, 1 deletions
diff --git a/src/cpu/x86/mtrr/mtrr.c b/src/cpu/x86/mtrr/mtrr.c index c2c629cbe4..08312fbebf 100644 --- a/src/cpu/x86/mtrr/mtrr.c +++ b/src/cpu/x86/mtrr/mtrr.c @@ -36,8 +36,8 @@ #include <arch/cpu.h> #include <arch/acpi.h> #include <memrange.h> -#if IS_ENABLED(CONFIG_X86_AMD_FIXED_MTRRS) #include <cpu/amd/mtrr.h> +#if IS_ENABLED(CONFIG_X86_AMD_FIXED_MTRRS) #define MTRR_FIXED_WRBACK_BITS (MTRR_READ_MEM | MTRR_WRITE_MEM) #else #define MTRR_FIXED_WRBACK_BITS 0 @@ -83,6 +83,30 @@ void enable_fixed_mtrr(void) wrmsr(MTRR_DEF_TYPE_MSR, msr); } +void fixed_mtrrs_expose_amd_rwdram(void) +{ + msr_t syscfg; + + if (!IS_ENABLED(CONFIG_X86_AMD_FIXED_MTRRS)) + return; + + syscfg = rdmsr(SYSCFG_MSR); + syscfg.lo |= SYSCFG_MSR_MtrrFixDramModEn; + wrmsr(SYSCFG_MSR, syscfg); +} + +void fixed_mtrrs_hide_amd_rwdram(void) +{ + msr_t syscfg; + + if (!IS_ENABLED(CONFIG_X86_AMD_FIXED_MTRRS)) + return; + + syscfg = rdmsr(SYSCFG_MSR); + syscfg.lo &= ~SYSCFG_MSR_MtrrFixDramModEn; + wrmsr(SYSCFG_MSR, syscfg); +} + static void enable_var_mtrr(unsigned char deftype) { msr_t msr; @@ -310,6 +334,8 @@ static void commit_fixed_mtrrs(void) msr_t fixed_msrs[NUM_FIXED_MTRRS]; unsigned long msr_index[NUM_FIXED_MTRRS]; + fixed_mtrrs_expose_amd_rwdram(); + memset(&fixed_msrs, 0, sizeof(fixed_msrs)); msr_num = 0; @@ -351,6 +377,8 @@ static void commit_fixed_mtrrs(void) for (i = 0; i < ARRAY_SIZE(fixed_msrs); i++) wrmsr(msr_index[i], fixed_msrs[i]); enable_cache(); + fixed_mtrrs_hide_amd_rwdram(); + } void x86_setup_fixed_mtrrs_no_enable(void) |