diff options
Diffstat (limited to 'UefiCpuPkg/Library')
| -rw-r--r-- | UefiCpuPkg/Library/MtrrLib/MtrrLib.c | 18 |
1 files changed, 11 insertions, 7 deletions
diff --git a/UefiCpuPkg/Library/MtrrLib/MtrrLib.c b/UefiCpuPkg/Library/MtrrLib/MtrrLib.c index 04c6a1c268..5f1a22c5fd 100644 --- a/UefiCpuPkg/Library/MtrrLib/MtrrLib.c +++ b/UefiCpuPkg/Library/MtrrLib/MtrrLib.c @@ -144,17 +144,21 @@ GetFirmwareVariableMtrrCount ( /**
Returns the default MTRR cache type for the system.
- @return MTRR default type
+ @return The default MTRR cache type.
**/
-UINT64
-GetMtrrDefaultMemoryType (
+MTRR_MEMORY_CACHE_TYPE
+EFIAPI
+MtrrGetDefaultMemoryType (
VOID
-)
+ )
{
- return (AsmReadMsr64 (MTRR_LIB_IA32_MTRR_DEF_TYPE) & 0xff);
-}
+ if (!IsMtrrSupported ()) {
+ return CacheUncacheable;
+ }
+ return (MTRR_MEMORY_CACHE_TYPE) (AsmReadMsr64 (MTRR_LIB_IA32_MTRR_DEF_TYPE) & 0x7);
+}
/**
Preparation before programming MTRR.
@@ -1036,7 +1040,7 @@ MtrrSetMemoryAttribute ( // The memory type is the same with the type specified by
// MTRR_LIB_IA32_MTRR_DEF_TYPE.
//
- if ((!OverwriteExistingMtrr) && (Attribute == GetMtrrDefaultMemoryType ())) {
+ if ((!OverwriteExistingMtrr) && (Attribute == MtrrGetDefaultMemoryType ())) {
//
// Invalidate the now-unused MTRRs
//
|