1 files changed, 4 insertions, 14 deletions
diff --git a/UefiCpuPkg/PiSmmCpuDxeSmm/PiSmmCpuDxeSmm.c b/UefiCpuPkg/PiSmmCpuDxeSmm/PiSmmCpuDxeSmm.c
index d2d0950f3b..55a9f79da8 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)));
   }