X-Git-Url: https://git.proxmox.com/?a=blobdiff_plain;f=MdePkg%2FLibrary%2FBaseLib%2FX64%2FWriteMm5.asm;h=fbe44ae078682e48de89028e2346d2650c06c62c;hb=a9a812a0ed4ab3d83941fdc6da281aebdb9bb296;hp=c4d798bcbd43152c00b99c3a32a61f1429495077;hpb=185d764218d07c06838d4758125a5ca66178e7c9;p=mirror_edk2.git

diff --git a/MdePkg/Library/BaseLib/X64/WriteMm5.asm b/MdePkg/Library/BaseLib/X64/WriteMm5.asm
index c4d798bcbd..fbe44ae078 100644
--- a/MdePkg/Library/BaseLib/X64/WriteMm5.asm
+++ b/MdePkg/Library/BaseLib/X64/WriteMm5.asm
@@ -24,13 +24,16 @@
     .code
 
 ;------------------------------------------------------------------------------
-; UINTN
+; VOID
 ; EFIAPI
 ; AsmWriteMm5 (
-;   VOID
+;   IN UINT64   Value
 ;   );
 ;------------------------------------------------------------------------------
 AsmWriteMm5 PROC
+    ;
+    ; 64-bit MASM doesn't support MMX instructions, so use opcode here
+    ;
     DB      48h, 0fh, 6eh, 0e9h
     ret
 AsmWriteMm5 ENDP