+++ /dev/null
-/** @file\r
- Timer Library functions built upon ITC on IPF.\r
-\r
- Copyright (c) 2006 - 2007, Intel Corporation<BR>\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
-\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: IpfTimerLib.c\r
-\r
-**/\r
-\r
-\r
-\r
-\r
-/**\r
- Performs a delay measured as number of ticks.\r
-\r
- An internal function to perform a delay measured as number of ticks. It's\r
- invoked by MicroSecondDelay() and NanoSecondDelay().\r
-\r
- @param Delay Number of ticks to delay.\r
-\r
-**/\r
-STATIC\r
-VOID\r
-InternalIpfDelay (\r
- IN INT64 Delay\r
- )\r
-{\r
- INT64 Ticks;\r
-\r
- //\r
- // The target timer count is calculated here\r
- //\r
- Ticks = (INT64)AsmReadItc () + Delay;\r
-\r
- //\r
- // Wait until time out\r
- // Delay > 2^63 could not be handled by this function\r
- // Timer wrap-arounds are handled correctly by this function\r
- //\r
- while (Ticks - (INT64)AsmReadItc() >= 0);\r
-}\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
-\r
- @return MicroSeconds\r
-\r
-**/\r
-UINTN\r
-EFIAPI\r
-MicroSecondDelay (\r
- IN UINTN MicroSeconds\r
- )\r
-{\r
- InternalIpfDelay (\r
- GetPerformanceCounterProperties (NULL, NULL) *\r
- MicroSeconds /\r
- 1000000\r
- );\r
- return MicroSeconds;\r
-}\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
-\r
- @return NanoSeconds\r
-\r
-**/\r
-UINTN\r
-EFIAPI\r
-NanoSecondDelay (\r
- IN UINTN NanoSeconds\r
- )\r
-{\r
- InternalIpfDelay (\r
- GetPerformanceCounterProperties (NULL, NULL) *\r
- NanoSeconds /\r
- 1000000000\r
- );\r
- return NanoSeconds;\r
-}\r
-\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
- 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
-\r
- @return The current value of the free running performance counter.\r
-\r
-**/\r
-UINT64\r
-EFIAPI\r
-GetPerformanceCounter (\r
- VOID\r
- )\r
-{\r
- return AsmReadItc ();\r
-}\r
-\r
-/**\r
- Retrieves the 64-bit frequency in Hz and the range of performance counter\r
- values.\r
-\r
- If StartValue is not NULL, then the value that the performance counter starts\r
- with immediately after is it rolls over is returned in StartValue. If\r
- EndValue is not NULL, then the value that the performance counter end with\r
- immediately before it rolls over is returned in EndValue. The 64-bit\r
- frequency of the performance counter in Hz is always returned. If StartValue\r
- is less than EndValue, then the performance counter counts up. If StartValue\r
- is greater than EndValue, then the performance counter counts down. For\r
- example, a 64-bit free running counter that counts up would have a StartValue\r
- of 0 and an EndValue of 0xFFFFFFFFFFFFFFFF. A 24-bit free running counter\r
- that counts down would have a StartValue of 0xFFFFFF and an EndValue of 0.\r
-\r
- @param StartValue The value the performance counter starts with when it\r
- rolls over.\r
- @param EndValue The value that the performance counter ends with before\r
- it rolls over.\r
-\r
- @return The frequency in Hz.\r
-\r
-**/\r
-UINT64\r
-EFIAPI\r
-GetPerformanceCounterProperties (\r
- OUT UINT64 *StartValue, OPTIONAL\r
- OUT UINT64 *EndValue OPTIONAL\r
- )\r
-{\r
- PAL_CALL_RETURN PalRet;\r
- UINT64 BaseFrequence;\r
-\r
- PalRet = PalCallStatic (NULL, 13, 0, 0, 0);\r
- ASSERT (PalRet.Status == 0);\r
- BaseFrequence = PalRet.r9;\r
-\r
- PalRet = PalCallStatic (NULL, 14, 0, 0, 0);\r
- ASSERT (PalRet.Status == 0);\r
-\r
- if (StartValue != NULL) {\r
- *StartValue = 0;\r
- }\r
-\r
- if (EndValue != NULL) {\r
- *EndValue = (UINT64)(-1);\r
- }\r
-\r
- return BaseFrequence * (PalRet.r11 >> 32) / (UINT32)PalRet.r11;\r
-}\r
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