1. Added comments to ASM files

[mirror_edk2.git] / MdePkg / Library / BaseLib / X64 / ReadMm4.asm

diff --git a/MdePkg/Library/BaseLib/X64/ReadMm4.asm b/MdePkg/Library/BaseLib/X64/ReadMm4.asm
index 73f528342e1b29e89fee56744f8af6b747906e99..dd52f99436b17d329324bd70714d989e99b4abf6 100644 (file)
--- a/MdePkg/Library/BaseLib/X64/ReadMm4.asm
+++ b/MdePkg/Library/BaseLib/X64/ReadMm4.asm
@@ -24,13 +24,16 @@
     .code\r
 \r
 ;------------------------------------------------------------------------------\r
-; UINTN\r
+; UINT64\r
 ; EFIAPI\r
 ; AsmReadMm4 (\r
 ;   VOID\r
 ;   );\r
 ;------------------------------------------------------------------------------\r
 AsmReadMm4  PROC\r
+    ;\r
+    ; 64-bit MASM doesn't support MMX instructions, so use opcode here\r
+    ;\r
     DB      48h, 0fh, 7eh, 0e0h\r
     ret\r
 AsmReadMm4  ENDP\r