1. Added comments to ASM files

[mirror_edk2.git] / MdePkg / Library / BaseLib / X64 / ReadMm0.asm

diff --git a/MdePkg/Library/BaseLib/X64/ReadMm0.asm b/MdePkg/Library/BaseLib/X64/ReadMm0.asm
index a81d20829863ea3578c6455cf95c249618f79bbb..0ed5c8f8aeb0d38765411b93f3406168720f3647 100644 (file)
--- a/MdePkg/Library/BaseLib/X64/ReadMm0.asm
+++ b/MdePkg/Library/BaseLib/X64/ReadMm0.asm
@@ -31,6 +31,9 @@
 ;   );\r
 ;------------------------------------------------------------------------------\r
 AsmReadMm0  PROC\r
+    ;\r
+    ; 64-bit MASM doesn't support MMX instructions, so use opcode here\r
+    ;\r
     DB      48h, 0fh, 7eh, 0c0h\r
     ret\r
 AsmReadMm0  ENDP\r