diff options
Diffstat (limited to 'UefiCpuPkg/CpuDxe/CpuDxe.c')
| -rw-r--r-- | UefiCpuPkg/CpuDxe/CpuDxe.c | 18 |
1 files changed, 8 insertions, 10 deletions
diff --git a/UefiCpuPkg/CpuDxe/CpuDxe.c b/UefiCpuPkg/CpuDxe/CpuDxe.c index a6a91507f6..920976c576 100644 --- a/UefiCpuPkg/CpuDxe/CpuDxe.c +++ b/UefiCpuPkg/CpuDxe/CpuDxe.c @@ -1,7 +1,7 @@ /** @file
CPU DXE Module to produce CPU ARCH Protocol.
- Copyright (c) 2008 - 2022, Intel Corporation. All rights reserved.<BR>
+ Copyright (c) 2008 - 2023, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
@@ -505,20 +505,18 @@ InitializeMtrrMask ( VOID
)
{
- UINT32 RegEax;
- UINT8 PhysicalAddressBits;
+ UINT32 MaxExtendedFunction;
+ CPUID_VIR_PHY_ADDRESS_SIZE_EAX VirPhyAddressSize;
- AsmCpuid (0x80000000, &RegEax, NULL, NULL, NULL);
+ AsmCpuid (CPUID_EXTENDED_FUNCTION, &MaxExtendedFunction, NULL, NULL, NULL);
- if (RegEax >= 0x80000008) {
- AsmCpuid (0x80000008, &RegEax, NULL, NULL, NULL);
-
- PhysicalAddressBits = (UINT8)RegEax;
+ if (MaxExtendedFunction >= CPUID_VIR_PHY_ADDRESS_SIZE) {
+ AsmCpuid (CPUID_VIR_PHY_ADDRESS_SIZE, &VirPhyAddressSize.Uint32, NULL, NULL, NULL);
} else {
- PhysicalAddressBits = 36;
+ VirPhyAddressSize.Bits.PhysicalAddressBits = 36;
}
- mValidMtrrBitsMask = LShiftU64 (1, PhysicalAddressBits) - 1;
+ mValidMtrrBitsMask = LShiftU64 (1, VirPhyAddressSize.Bits.PhysicalAddressBits) - 1;
mValidMtrrAddressMask = mValidMtrrBitsMask & 0xfffffffffffff000ULL;
}
|