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-rw-r--r--Core/MdePkg/Library/BaseLib/Ia32/ReadTsc.c37
1 files changed, 37 insertions, 0 deletions
diff --git a/Core/MdePkg/Library/BaseLib/Ia32/ReadTsc.c b/Core/MdePkg/Library/BaseLib/Ia32/ReadTsc.c
new file mode 100644
index 0000000000..11a5095093
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+++ b/Core/MdePkg/Library/BaseLib/Ia32/ReadTsc.c
@@ -0,0 +1,37 @@
+/** @file
+ AsmReadTsc function
+
+ Copyright (c) 2006 - 2008, 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.
+
+**/
+
+
+
+
+/**
+ Reads the current value of Time Stamp Counter (TSC).
+
+ Reads and returns the current value of TSC. This function is only available
+ on IA-32 and x64.
+
+ @return The current value of TSC
+
+**/
+UINT64
+EFIAPI
+AsmReadTsc (
+ VOID
+ )
+{
+ _asm {
+ rdtsc
+ }
+}
+