Refine comments of X64 assembly files of MDE BaseLib.

[mirror_edk2.git] / MdePkg / Library / BaseLib / X64 / CpuIdEx.S

diff --git a/MdePkg/Library/BaseLib/X64/CpuIdEx.S b/MdePkg/Library/BaseLib/X64/CpuIdEx.S
index 62d698a58444f4c29efec11fbd2fee0fe02a4ca5..32abf114dbb00bd99927a075c88fb5dfddb450d5 100644 (file)
--- a/MdePkg/Library/BaseLib/X64/CpuIdEx.S
+++ b/MdePkg/Library/BaseLib/X64/CpuIdEx.S
@@ -38,7 +38,7 @@ ASM_PFX(AsmCpuidEx):
     push    %rbx
     movl    %ecx,%eax
     movl    %edx,%ecx
-    push    %rax
+    push    %rax                  # save Index on stack
     cpuid
     mov     0x38(%rsp), %r10
     test    %r10, %r10
@@ -57,6 +57,6 @@ L3:
     jrcxz   L4
     mov     %edx, (%rcx)
 L4: 
-    pop     %rax
+    pop     %rax                  # restore Index to rax as return value
     pop     %rbx
     ret