summaryrefslogtreecommitdiff
path: root/MdePkg/Library/BaseLib/X64/ReadTsc.S
diff options
context:
space:
mode:
Diffstat (limited to 'MdePkg/Library/BaseLib/X64/ReadTsc.S')
-rw-r--r--MdePkg/Library/BaseLib/X64/ReadTsc.S38
1 files changed, 38 insertions, 0 deletions
diff --git a/MdePkg/Library/BaseLib/X64/ReadTsc.S b/MdePkg/Library/BaseLib/X64/ReadTsc.S
new file mode 100644
index 0000000000..776ffc2265
--- /dev/null
+++ b/MdePkg/Library/BaseLib/X64/ReadTsc.S
@@ -0,0 +1,38 @@
+#------------------------------------------------------------------------------
+#
+# Copyright (c) 2006, Intel Corporation
+# All rights reserved. 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.S
+#
+# Abstract:
+#
+# AsmReadTsc function
+#
+# Notes:
+#
+#------------------------------------------------------------------------------
+
+
+#------------------------------------------------------------------------------
+# UINT64
+# EFIAPI
+# AsmReadTsc (
+# VOID
+# );
+#------------------------------------------------------------------------------
+.global _AsmReadTsc;
+.align 16;
+_AsmReadTsc:
+ rdtsc
+ shl $0x20, %rdx
+ or %rdx, %rax
+ ret