diff options
Diffstat (limited to 'UefiCpuPkg/Library/MtrrLib/MtrrLib.c')
| -rw-r--r-- | UefiCpuPkg/Library/MtrrLib/MtrrLib.c | 20 |
1 files changed, 9 insertions, 11 deletions
diff --git a/UefiCpuPkg/Library/MtrrLib/MtrrLib.c b/UefiCpuPkg/Library/MtrrLib/MtrrLib.c index 2679725a17..415fc2ff41 100644 --- a/UefiCpuPkg/Library/MtrrLib/MtrrLib.c +++ b/UefiCpuPkg/Library/MtrrLib/MtrrLib.c @@ -1054,22 +1054,20 @@ MtrrLibInitializeMtrrMask ( OUT UINT64 *MtrrValidAddressMask
)
{
- UINT32 RegEax;
- UINT8 PhysicalAddressBits;
+ UINT32 MaxExtendedFunction;
+ CPUID_VIR_PHY_ADDRESS_SIZE_EAX VirPhyAddressSize;
- AsmCpuid (0x80000000, &RegEax, NULL, NULL, NULL);
- if (RegEax >= 0x80000008) {
- AsmCpuid (0x80000008, &RegEax, NULL, NULL, NULL);
+ AsmCpuid (CPUID_EXTENDED_FUNCTION, &MaxExtendedFunction, NULL, NULL, NULL);
- PhysicalAddressBits = (UINT8) RegEax;
-
- *MtrrValidBitsMask = LShiftU64 (1, PhysicalAddressBits) - 1;
- *MtrrValidAddressMask = *MtrrValidBitsMask & 0xfffffffffffff000ULL;
+ if (MaxExtendedFunction >= CPUID_VIR_PHY_ADDRESS_SIZE) {
+ AsmCpuid (CPUID_VIR_PHY_ADDRESS_SIZE, &VirPhyAddressSize.Uint32, NULL, NULL, NULL);
} else {
- *MtrrValidBitsMask = MTRR_LIB_MSR_VALID_MASK;
- *MtrrValidAddressMask = MTRR_LIB_CACHE_VALID_ADDRESS;
+ VirPhyAddressSize.Bits.PhysicalAddressBits = 36;
}
+
+ *MtrrValidBitsMask = LShiftU64 (1, VirPhyAddressSize.Bits.PhysicalAddressBits) - 1;
+ *MtrrValidAddressMask = *MtrrValidBitsMask & 0xfffffffffffff000ULL;
}
|