+++ /dev/null
-/** @file\r
- Timer Library functions built upon ACPI on IA32/x64.\r
- \r
- ACPI power management timer is a 24-bit or 32-bit fixed rate free running count-up\r
- timer that runs off a 3.579545 MHz clock. \r
- When startup, Duet will check the FADT to determine whether the PM timer is a \r
- 32-bit or 24-bit timer.\r
-\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
-**/\r
-\r
-#include <Base.h>\r
-#include <Library/TimerLib.h>\r
-#include <Library/BaseLib.h>\r
-#include <Library/DebugLib.h>\r
-#include <Library/HobLib.h>\r
-#include <Guid/AcpiDescription.h>\r
-#include <Library/IoLib.h>\r
-#include <Library/PciLib.h>\r
-\r
-EFI_ACPI_DESCRIPTION *gAcpiDesc = NULL;\r
-\r
-/**\r
- Internal function to get Acpi information from HOB.\r
- \r
- @return Pointer to ACPI description structure.\r
-**/\r
-EFI_ACPI_DESCRIPTION*\r
-InternalGetApciDescrptionTable (\r
- VOID\r
- )\r
-{\r
- EFI_PEI_HOB_POINTERS GuidHob;\r
- \r
- if (gAcpiDesc != NULL) {\r
- return gAcpiDesc;\r
- }\r
- \r
- GuidHob.Raw = GetFirstGuidHob (&gEfiAcpiDescriptionGuid);\r
- if (GuidHob.Raw != NULL) {\r
- gAcpiDesc = GET_GUID_HOB_DATA (GuidHob.Guid);\r
- DEBUG ((EFI_D_INFO, "ACPI Timer: PM_TMR_BLK.RegisterBitWidth = 0x%X\n", gAcpiDesc->PM_TMR_BLK.RegisterBitWidth));\r
- DEBUG ((EFI_D_INFO, "ACPI Timer: PM_TMR_BLK.Address = 0x%X\n", gAcpiDesc->PM_TMR_BLK.Address));\r
- return gAcpiDesc;\r
- } else {\r
- DEBUG ((EFI_D_ERROR, "Fail to get Acpi description table from hob\n"));\r
- return NULL;\r
- }\r
-}\r
-\r
-/**\r
- Internal function to read the current tick counter of ACPI.\r
-\r
- @return The tick counter read.\r
-\r
-**/\r
-STATIC\r
-UINT32\r
-InternalAcpiGetTimerTick (\r
- VOID\r
- )\r
-{\r
- return IoRead32 ((UINTN)gAcpiDesc->PM_TMR_BLK.Address);\r
-}\r
-\r
-/**\r
- Stalls the CPU for at least the given number of ticks.\r
-\r
- Stalls the CPU for at least the given number of ticks. It's invoked by\r
- MicroSecondDelay() and NanoSecondDelay().\r
-\r
- @param Delay A period of time to delay in ticks.\r
-\r
-**/\r
-STATIC\r
-VOID\r
-InternalAcpiDelay (\r
- IN UINT32 Delay\r
- )\r
-{\r
- UINT32 Ticks;\r
- UINT32 Times;\r
-\r
- Times = Delay >> (gAcpiDesc->PM_TMR_BLK.RegisterBitWidth - 2);\r
- Delay &= (1 << (gAcpiDesc->PM_TMR_BLK.RegisterBitWidth - 2)) - 1;\r
- do {\r
- //\r
- // The target timer count is calculated here\r
- //\r
- Ticks = InternalAcpiGetTimerTick () + Delay;\r
- Delay = 1 << (gAcpiDesc->PM_TMR_BLK.RegisterBitWidth - 2);\r
- //\r
- // Wait until time out\r
- // Delay >= 2^23 (if ACPI provide 24-bit timer) or Delay >= 2^31 (if ACPI\r
- // provide 32-bit timer) could not be handled by this function\r
- // Timer wrap-arounds are handled correctly by this function\r
- //\r
- while (((Ticks - InternalAcpiGetTimerTick ()) & (1 << (gAcpiDesc->PM_TMR_BLK.RegisterBitWidth - 1))) == 0) {\r
- CpuPause ();\r
- }\r
- } while (Times-- > 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
-\r
- if (InternalGetApciDescrptionTable() == NULL) {\r
- return MicroSeconds;\r
- }\r
- \r
- InternalAcpiDelay (\r
- (UINT32)DivU64x32 (\r
- MultU64x32 (\r
- MicroSeconds,\r
- 3579545\r
- ),\r
- 1000000u\r
- )\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
- if (InternalGetApciDescrptionTable() == NULL) {\r
- return NanoSeconds;\r
- }\r
- \r
- InternalAcpiDelay (\r
- (UINT32)DivU64x32 (\r
- MultU64x32 (\r
- NanoSeconds,\r
- 3579545\r
- ),\r
- 1000000000u\r
- )\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
- if (InternalGetApciDescrptionTable() == NULL) {\r
- return 0;\r
- }\r
- \r
- return (UINT64)InternalAcpiGetTimerTick ();\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
- if (InternalGetApciDescrptionTable() == NULL) {\r
- return 0;\r
- }\r
- \r
- if (StartValue != NULL) {\r
- *StartValue = 0;\r
- }\r
-\r
- if (EndValue != NULL) {\r
- *EndValue = (1 << gAcpiDesc->PM_TMR_BLK.RegisterBitWidth) - 1;\r
- }\r
-\r
- return 3579545;\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
- UINT64 NanoSeconds;\r
- UINT32 Remainder;\r
-\r
- //\r
- // Ticks\r
- // Time = --------- x 1,000,000,000\r
- // Frequency\r
- //\r
- NanoSeconds = MultU64x32 (DivU64x32Remainder (Ticks, 3579545, &Remainder), 1000000000u);\r
-\r
- //\r
- // Frequency < 0x100000000, so Remainder < 0x100000000, then (Remainder * 1,000,000,000)\r
- // will not overflow 64-bit.\r
- //\r
- NanoSeconds += DivU64x32 (MultU64x32 ((UINT64) Remainder, 1000000000u), 3579545);\r
-\r
- return NanoSeconds;\r
-}\r
projects / mirror_edk2.git / blobdiff