UefiCpuPkg/PiSmmCpuDxeSmm: patch "gSmbase" with PatchInstructionX86()

[mirror_edk2.git] / UefiCpuPkg / PiSmmCpuDxeSmm / X64 / SmiEntry.nasm

diff --git a/UefiCpuPkg/PiSmmCpuDxeSmm/X64/SmiEntry.nasm b/UefiCpuPkg/PiSmmCpuDxeSmm/X64/SmiEntry.nasm
index 697fd2bec7c616c8d1fd855dd3afccf4f846afcb..0e314279a54136883526bdc34f66ff3206a8bfb3 100644 (file)
--- a/UefiCpuPkg/PiSmmCpuDxeSmm/X64/SmiEntry.nasm
+++ b/UefiCpuPkg/PiSmmCpuDxeSmm/X64/SmiEntry.nasm
@@ -53,7 +53,7 @@ extern ASM_PFX(gSmiHandlerIdtr)
 extern ASM_PFX(CpuSmmDebugEntry)\r
 extern ASM_PFX(CpuSmmDebugExit)\r
 \r
-global ASM_PFX(gSmbase)\r
+global ASM_PFX(gPatchSmbase)\r
 global ASM_PFX(mXdSupported)\r
 global ASM_PFX(gSmiStack)\r
 global ASM_PFX(gSmiCr3)\r
@@ -75,8 +75,8 @@ _SmiEntryPoint:
 o32 lgdt    [cs:bx]                       ; lgdt fword ptr cs:[bx]\r
     mov     ax, PROTECT_MODE_CS\r
     mov     [cs:bx-0x2],ax\r
-    DB      0x66, 0xbf                   ; mov edi, SMBASE\r
-ASM_PFX(gSmbase): DD 0\r
+    mov     edi, strict dword 0           ; source operand will be patched\r
+ASM_PFX(gPatchSmbase):\r
     lea     eax, [edi + (@ProtectedMode - _SmiEntryPoint) + 0x8000]\r
     mov     [cs:bx-0x6],eax\r
     mov     ebx, cr0\r