1. Added comments to ASM files

[mirror_edk2.git] / MdePkg / Library / BaseLib / Ia32 / SwapBytes64.asm

diff --git a/MdePkg/Library/BaseLib/Ia32/SwapBytes64.asm b/MdePkg/Library/BaseLib/Ia32/SwapBytes64.asm
index 186d094eee0fad84bc2d351ff4a2a2d5611acc7d..7647880202c47691637ce59a6f6d83d529667ab0 100644 (file)
--- a/MdePkg/Library/BaseLib/Ia32/SwapBytes64.asm
+++ b/MdePkg/Library/BaseLib/Ia32/SwapBytes64.asm
@@ -33,8 +33,8 @@
 ;   );\r
 ;------------------------------------------------------------------------------\r
 InternalMathSwapBytes64 PROC\r
-    mov     eax, [esp + 8]\r
-    mov     edx, [esp + 4]\r
+    mov     eax, [esp + 8]              ; eax <- upper 32 bits\r
+    mov     edx, [esp + 4]              ; edx <- lower 32 bits\r
     bswap   eax\r
     bswap   edx\r
     ret\r