diff options
Diffstat (limited to 'Core/MdePkg/Library/BaseLib/X64/ReadTsc.nasm')
-rw-r--r-- | Core/MdePkg/Library/BaseLib/X64/ReadTsc.nasm | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/Core/MdePkg/Library/BaseLib/X64/ReadTsc.nasm b/Core/MdePkg/Library/BaseLib/X64/ReadTsc.nasm new file mode 100644 index 0000000000..457322cfe0 --- /dev/null +++ b/Core/MdePkg/Library/BaseLib/X64/ReadTsc.nasm @@ -0,0 +1,40 @@ +;------------------------------------------------------------------------------
+;
+; Copyright (c) 2006, Intel Corporation. All rights reserved.<BR>
+; This program and the accompanying materials
+; are licensed and made available under the terms and conditions of the BSD License
+; which accompanies this distribution. The full text of the license may be found at
+; http://opensource.org/licenses/bsd-license.php.
+;
+; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+;
+; 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
+
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