1. Added comments to ASM files

[mirror_edk2.git] / MdePkg / Library / BaseLib / X64 / WriteMm2.asm

diff --git a/MdePkg/Library/BaseLib/X64/WriteMm2.asm b/MdePkg/Library/BaseLib/X64/WriteMm2.asm
index bd0f0a0e1adcd3c94b5e7c0c25fe51f898ac09bd..01db79007d647c78286ac488b8b4dcd7aa3fa12b 100644 (file)
--- a/MdePkg/Library/BaseLib/X64/WriteMm2.asm
+++ b/MdePkg/Library/BaseLib/X64/WriteMm2.asm
@@ -31,6 +31,9 @@
 ;   );\r
 ;------------------------------------------------------------------------------\r
 AsmWriteMm2 PROC\r
+    ;\r
+    ; 64-bit MASM doesn't support MMX instructions, so use opcode here\r
+    ;\r
     DB      48h, 0fh, 6eh, 0d1h\r
     ret\r
 AsmWriteMm2 ENDP\r