/** @file\r
- Timer Library Functions\r
+ Provides calibrated delay and performance counter services.\r
\r
- Copyright (c) 2006, Intel Corporation\r
- All rights reserved. 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
+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
\r
- THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
- WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
-\r
- Module Name: TimerLib.h\r
+THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
+WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
\r
**/\r
\r
\r
@param MicroSeconds The minimum number of microseconds to delay.\r
\r
- @return Return value depends on implementation.\r
+ @return The value of MicroSeconds inputted.\r
\r
**/\r
UINTN\r
\r
@param NanoSeconds The minimum number of nanoseconds to delay.\r
\r
- @return Return value depends on implementation.\r
+ @return The value of NanoSeconds inputted.\r
\r
**/\r
UINTN\r
/**\r
Retrieves the current value of a 64-bit free running performance counter.\r
\r
- Retrieves the current value of a 64-bit free running performance counter. The\r
- counter can either count up by 1 or count down by 1. If the physical\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
GetPerformanceCounterProperties().\r
UINT64\r
EFIAPI\r
GetPerformanceCounterProperties (\r
- IN UINT64 *StartValue, OPTIONAL\r
- IN UINT64 *EndValue OPTIONAL\r
+ OUT UINT64 *StartValue, OPTIONAL\r
+ 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