1. Added comments to ASM files

[mirror_edk2.git] / MdePkg / Library / BaseLib / X64 / WriteMm4.asm

diff --git a/MdePkg/Library/BaseLib/X64/WriteMm4.asm b/MdePkg/Library/BaseLib/X64/WriteMm4.asm
index d9bc46e16c5ec21cef11a09735885ad5dcb8b8a5..6848dbf7ec085b7495bee1f7a30b6710d9ecdc6a 100644 (file)
--- a/MdePkg/Library/BaseLib/X64/WriteMm4.asm
+++ b/MdePkg/Library/BaseLib/X64/WriteMm4.asm
@@ -31,6 +31,9 @@
 ;   );\r
 ;------------------------------------------------------------------------------\r
 AsmWriteMm4 PROC\r
+    ;\r
+    ; 64-bit MASM doesn't support MMX instructions, so use opcode here\r
+    ;\r
     DB      48h, 0fh, 6eh, 0e1h\r
     ret\r
 AsmWriteMm4 ENDP\r