diff options
Diffstat (limited to 'src/cpu/x86/mtrr')
| -rw-r--r-- | src/cpu/x86/mtrr/earlymtrr.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/src/cpu/x86/mtrr/earlymtrr.c b/src/cpu/x86/mtrr/earlymtrr.c index 105f7c49df..aea8e258d4 100644 --- a/src/cpu/x86/mtrr/earlymtrr.c +++ b/src/cpu/x86/mtrr/earlymtrr.c @@ -117,4 +117,17 @@ static void early_mtrr_init(void) enable_cache(); } +static int early_mtrr_init_detected(void) +{ + msr_t msr; + /* See if MTRR's are enabled. + * a #RESET disables them while an #INIT + * preserves their state. This works + * on both Intel and AMD cpus, at least + * according to the documentation. + */ + msr = rdmsr(MTRRdefType_MSR); + return msr.lo & 0x00000800; +} + #endif /* EARLYMTRR_C */ |