1. Updated function headers in all assembly files.

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

diff --git a/MdePkg/Library/BaseLib/X64/ReadTsc.asm b/MdePkg/Library/BaseLib/X64/ReadTsc.asm
index 25fa2cc5d8387edd96a2b84eabff97abd313998a..7c45eebd5465a7c6320f98b7210c84f49f35b473 100644 (file)
--- a/MdePkg/Library/BaseLib/X64/ReadTsc.asm
+++ b/MdePkg/Library/BaseLib/X64/ReadTsc.asm
@@ -32,8 +32,8 @@
 ;------------------------------------------------------------------------------\r
 AsmReadTsc  PROC\r
     rdtsc\r
-    shl     rax, 20h\r
-    shrd    rax, rdx, 20h\r
+    shl     rdx, 20h\r
+    or      rax, rdx\r
     ret\r
 AsmReadTsc  ENDP\r
 \r