diff options
| -rw-r--r-- | UefiCpuPkg/PiSmmCpuDxeSmm/PiSmmCpuDxeSmm.c | 18 |
1 files changed, 4 insertions, 14 deletions
diff --git a/UefiCpuPkg/PiSmmCpuDxeSmm/PiSmmCpuDxeSmm.c b/UefiCpuPkg/PiSmmCpuDxeSmm/PiSmmCpuDxeSmm.c index d2d0950..55a9f79d 100644 --- a/UefiCpuPkg/PiSmmCpuDxeSmm/PiSmmCpuDxeSmm.c +++ b/UefiCpuPkg/PiSmmCpuDxeSmm/PiSmmCpuDxeSmm.c @@ -871,24 +871,14 @@ PiCpuSmmEntry ( //
DEBUG ((DEBUG_INFO, "PiCpuSmmEntry: gSmmBaseHobGuid not found!\n"));
//
- // Allocate buffer for all of the tiles.
+ // very old processors (i486 + pentium) need 32k not 4k alignment, exclude them.
//
- // Intel(R) 64 and IA-32 Architectures Software Developer's Manual
- // Volume 3C, Section 34.11 SMBASE Relocation
- // For Pentium and Intel486 processors, the SMBASE values must be
- // aligned on a 32-KByte boundary or the processor will enter shutdown
- // state during the execution of a RSM instruction.
+ ASSERT (FamilyId >= 6);
//
- // Intel486 processors: FamilyId is 4
- // Pentium processors : FamilyId is 5
+ // Allocate buffer for all of the tiles.
//
BufferPages = EFI_SIZE_TO_PAGES (SIZE_32KB + TileSize * (mMaxNumberOfCpus - 1));
- if ((FamilyId == 4) || (FamilyId == 5)) {
- Buffer = AllocateAlignedCodePages (BufferPages, SIZE_32KB);
- } else {
- Buffer = AllocateAlignedCodePages (BufferPages, SIZE_4KB);
- }
-
+ Buffer = AllocateAlignedCodePages (BufferPages, SIZE_4KB);
ASSERT (Buffer != NULL);
DEBUG ((DEBUG_INFO, "New Allcoated SMRAM SaveState Buffer (0x%08x, 0x%08x)\n", Buffer, EFI_PAGES_TO_SIZE (BufferPages)));
}
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