MdePkg/UefiLib: introduce EfiEventGroupSignal

[mirror_edk2.git] / MdePkg / Include / Library / TimerLib.h

diff --git a/MdePkg/Include/Library/TimerLib.h b/MdePkg/Include/Library/TimerLib.h
index 4f920311c69a776a45459f1b55de5397135ebced..ecc3ad3ff79ec7b69a7004f667d12035126f0a0d 100644 (file)
--- a/MdePkg/Include/Library/TimerLib.h
+++ b/MdePkg/Include/Library/TimerLib.h
@@ -1,8 +1,8 @@
 /** @file\r
   Provides calibrated delay and performance counter services.\r
 \r
-Copyright (c) 2006 - 2008, Intel Corporation\r
-All rights reserved. This program and the accompanying materials\r
+Copyright (c) 2006 - 2011, Intel Corporation. All rights reserved.<BR>\r
+This program and the accompanying materials\r
 are licensed and made available under the terms and conditions of the BSD License\r
 which accompanies this distribution.  The full text of the license may be found at\r
 http://opensource.org/licenses/bsd-license.php\r
@@ -16,6 +16,8 @@ WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
 #define __TIMER_LIB__\r
 \r
 /**\r
+  Stalls the CPU for at least the given number of microseconds.\r
+\r
   Stalls the CPU for the number of microseconds specified by MicroSeconds.\r
 \r
   @param  MicroSeconds  The minimum number of microseconds to delay.\r
@@ -30,6 +32,8 @@ MicroSecondDelay (
   );\r
 \r
 /**\r
+  Stalls the CPU for at least the given number of nanoseconds.\r
+\r
   Stalls the CPU for the number of nanoseconds specified by NanoSeconds.\r
 \r
   @param  NanoSeconds The minimum number of nanoseconds to delay.\r
@@ -44,7 +48,8 @@ NanoSecondDelay (
   );\r
 \r
 /**\r
-  Retrieves the current value of a 64-bit free running performance counter. \r
+  Retrieves the current value of a 64-bit free running performance counter.\r
+\r
   The counter can either count up by 1 or count down by 1. If the physical\r
   performance counter counts by a larger increment, then the counter values\r
   must be translated. The properties of the counter can be retrieved from\r
@@ -89,4 +94,21 @@ GetPerformanceCounterProperties (
   OUT      UINT64                    *EndValue     OPTIONAL\r
   );\r
 \r
+/**\r
+  Converts elapsed ticks of performance counter to time in nanoseconds.\r
+\r
+  This function converts the elapsed ticks of running performance counter to\r
+  time value in unit of nanoseconds.\r
+\r
+  @param  Ticks     The number of elapsed ticks of running performance counter.\r
+\r
+  @return The elapsed time in nanoseconds.\r
+\r
+**/\r
+UINT64\r
+EFIAPI\r
+GetTimeInNanoSecond (\r
+  IN      UINT64                     Ticks\r
+  );\r
+\r
 #endif\r