1. Added comments to ASM files

[mirror_edk2.git] / MdePkg / Library / BaseLib / X64 / ReadMm5.asm

diff --git a/MdePkg/Library/BaseLib/X64/ReadMm5.asm b/MdePkg/Library/BaseLib/X64/ReadMm5.asm
index 5295c38ae01fb4ea074d2864863c019a33486c9c..1f30e4bed47121812312674de1d1fed02b3230a2 100644 (file)
--- a/MdePkg/Library/BaseLib/X64/ReadMm5.asm
+++ b/MdePkg/Library/BaseLib/X64/ReadMm5.asm
@@ -31,6 +31,9 @@
 ;   );\r
 ;------------------------------------------------------------------------------\r
 AsmReadMm5  PROC\r
+    ;\r
+    ; 64-bit MASM doesn't support MMX instructions, so use opcode here\r
+    ;\r
     DB      48h, 0fh, 7eh, 0e8h\r
     ret\r
 AsmReadMm5  ENDP\r