[PATCH 1/2] UefiCpuPkg/PiSmmCpuDxeSmm: drop support for obsolete processors

["Gerd Hoffmann" <kraxel@redhat.com>]

It's highly unlikely the code ever runs on processors which are
almost 30 years old.  Drop the code handling them.

Bugzilla: https://bugzilla.tianocore.org/show_bug.cgi?id=4345
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
 UefiCpuPkg/PiSmmCpuDxeSmm/PiSmmCpuDxeSmm.c | 20 +++++---------------
 1 file changed, 5 insertions(+), 15 deletions(-)

diff --git a/UefiCpuPkg/PiSmmCpuDxeSmm/PiSmmCpuDxeSmm.c b/UefiCpuPkg/PiSmmCpuDxeSmm/PiSmmCpuDxeSmm.c
index d2d0950f3b42..55a9f79da8eb 100644
--- a/UefiCpuPkg/PiSmmCpuDxeSmm/PiSmmCpuDxeSmm.c
+++ b/UefiCpuPkg/PiSmmCpuDxeSmm/PiSmmCpuDxeSmm.c
@@ -871,24 +871,14 @@ PiCpuSmmEntry (
     //
     DEBUG ((DEBUG_INFO, "PiCpuSmmEntry: gSmmBaseHobGuid not found!\n"));
     //
+    // very old processors (i486 + pentium) need 32k not 4k alignment, exclude them.
+    //
+    ASSERT (FamilyId >= 6);
+    //
     // Allocate buffer for all of the tiles.
     //
-    // 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.
-    //
-    // Intel486 processors: FamilyId is 4
-    // Pentium processors : FamilyId is 5
-    //
     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)));
   }
-- 
2.39.2