X-Git-Url: https://git.proxmox.com/?p=mirror_edk2.git;a=blobdiff_plain;f=MdePkg%2FLibrary%2FBaseLib%2FX64%2FReadDr5.asm;h=3bee3a56ec4410786a1e723638a1b724c2be72f1;hp=0582502220803c163dc35af5ae4ab88ce8f337e0;hb=a9a812a0ed4ab3d83941fdc6da281aebdb9bb296;hpb=741fb364170375f89aa9c29488cc402db07a3776

diff --git a/MdePkg/Library/BaseLib/X64/ReadDr5.asm b/MdePkg/Library/BaseLib/X64/ReadDr5.asm
index 0582502220..3bee3a56ec 100644
--- a/MdePkg/Library/BaseLib/X64/ReadDr5.asm
+++ b/MdePkg/Library/BaseLib/X64/ReadDr5.asm
@@ -31,6 +31,10 @@
 ;   );
 ;------------------------------------------------------------------------------
 AsmReadDr5  PROC
+    ;
+    ; There's no obvious reason to access this register, since it's aliased to
+    ; DR7 when DE=0 or an exception generated when DE=1
+    ;
     DB      0fh, 21h, 0e8h
     ret
 AsmReadDr5  ENDP