1 files changed, 34 insertions, 0 deletions
diff --git a/roms/edk2/MdePkg/Library/BaseLib/X64/ReadTsc.nasm b/roms/edk2/MdePkg/Library/BaseLib/X64/ReadTsc.nasm
new file mode 100644
index 000000000..45672d680
--- /dev/null
+++ b/roms/edk2/MdePkg/Library/BaseLib/X64/ReadTsc.nasm
@@ -0,0 +1,34 @@
+;------------------------------------------------------------------------------
+;
+; Copyright (c) 2006, Intel Corporation. All rights reserved.<BR>
+; SPDX-License-Identifier: BSD-2-Clause-Patent
+;
+; Module Name:
+;
+;   ReadTsc.Asm
+;
+; Abstract:
+;
+;   AsmReadTsc function
+;
+; Notes:
+;
+;------------------------------------------------------------------------------
+
+    DEFAULT REL
+    SECTION .text
+
+;------------------------------------------------------------------------------
+; UINT64
+; EFIAPI
+; AsmReadTsc (
+;   VOID
+;   );
+;------------------------------------------------------------------------------
+global ASM_PFX(AsmReadTsc)
+ASM_PFX(AsmReadTsc):
+    rdtsc
+    shl     rdx, 0x20
+    or      rax, rdx
+    ret
+