1. Added comments to ASM files

[mirror_edk2.git] / MdePkg / Library / BaseLib / X64 / WriteMm0.asm

diff --git a/MdePkg/Library/BaseLib/X64/WriteMm0.asm b/MdePkg/Library/BaseLib/X64/WriteMm0.asm
index 0ad65e366d4957c13c6c40cf2b53d24ad1bbd116..7496362d86fc18c985bbe0af1c9cdcf41b8f5a0a 100644 (file)
--- a/MdePkg/Library/BaseLib/X64/WriteMm0.asm
+++ b/MdePkg/Library/BaseLib/X64/WriteMm0.asm
@@ -31,6 +31,9 @@
 ;   );\r
 ;------------------------------------------------------------------------------\r
 AsmWriteMm0 PROC\r
+    ;\r
+    ; 64-bit MASM doesn't support MMX instructions, so use opcode here\r
+    ;\r
     DB      48h, 0fh, 6eh, 0c1h\r
     ret\r
 AsmWriteMm0 ENDP\r