diff options
Diffstat (limited to 'UefiCpuPkg')
| -rw-r--r-- | UefiCpuPkg/Library/MtrrLib/MtrrLib.c | 16 |
1 files changed, 12 insertions, 4 deletions
diff --git a/UefiCpuPkg/Library/MtrrLib/MtrrLib.c b/UefiCpuPkg/Library/MtrrLib/MtrrLib.c index edb75c04a..04c6a1c26 100644 --- a/UefiCpuPkg/Library/MtrrLib/MtrrLib.c +++ b/UefiCpuPkg/Library/MtrrLib/MtrrLib.c @@ -477,10 +477,12 @@ CombineMemoryAttribute ( UINT64 MtrrEnd;
UINT64 EndAddress;
UINT32 FirmwareVariableMtrrCount;
+ BOOLEAN CoveredByExistingMtrr;
FirmwareVariableMtrrCount = GetFirmwareVariableMtrrCount ();
*OverwriteExistingMtrr = FALSE;
+ CoveredByExistingMtrr = FALSE;
EndAddress = *Base +*Length - 1;
for (Index = 0; Index < FirmwareVariableMtrrCount; Index++) {
@@ -501,11 +503,12 @@ CombineMemoryAttribute ( //
if (Attributes == VariableMtrr[Index].Type) {
//
- // if the Mtrr range contain the request range, return RETURN_SUCCESS
+ // if the Mtrr range contain the request range, set a flag, then continue to
+ // invalidate any MTRR of the same request range with higher priority cache type.
//
if (VariableMtrr[Index].BaseAddress <= *Base && MtrrEnd >= EndAddress) {
- *Length = 0;
- return RETURN_SUCCESS;
+ CoveredByExistingMtrr = TRUE;
+ continue;
}
//
// invalid this MTRR, and program the combine range
@@ -552,6 +555,10 @@ CombineMemoryAttribute ( return RETURN_ACCESS_DENIED;
}
+ if (CoveredByExistingMtrr) {
+ *Length = 0;
+ }
+
return RETURN_SUCCESS;
}
@@ -1007,8 +1014,9 @@ MtrrSetMemoryAttribute ( if (Length == 0) {
//
- // Combined successfully
+ // Combined successfully, invalidate the now-unused MTRRs
//
+ InvalidateMtrr(VariableMtrr);
Status = RETURN_SUCCESS;
goto Done;
}
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