+++ /dev/null
-/** @file\r
- ACPI Timer implements one instance of Timer Library.\r
-\r
- Copyright (c) 2014, Intel Corporation. All rights reserved.<BR>\r
- SPDX-License-Identifier: BSD-2-Clause-Patent\r
-\r
-**/\r
-\r
-#include <PiPei.h>\r
-#include <Library/TimerLib.h>\r
-#include <Library/BaseLib.h>\r
-#include <Library/IoLib.h>\r
-#include <Library/HobLib.h>\r
-#include <Library/DebugLib.h>\r
-\r
-#include <Guid/AcpiBoardInfoGuid.h>\r
-#include <IndustryStandard/Acpi.h>\r
-\r
-#define ACPI_TIMER_COUNT_SIZE BIT24\r
-\r
-UINTN mPmTimerReg = 0;\r
-\r
-/**\r
- The constructor function enables ACPI IO space.\r
-\r
- If ACPI I/O space not enabled, this function will enable it.\r
- It will always return RETURN_SUCCESS.\r
-\r
- @retval EFI_SUCCESS The constructor always returns RETURN_SUCCESS.\r
-\r
-**/\r
-RETURN_STATUS\r
-EFIAPI\r
-AcpiTimerLibConstructor (\r
- VOID\r
- )\r
-{\r
- EFI_HOB_GUID_TYPE *GuidHob;\r
- ACPI_BOARD_INFO *pAcpiBoardInfo; \r
- \r
- //\r
- // Find the acpi board information guid hob\r
- //\r
- GuidHob = GetFirstGuidHob (&gUefiAcpiBoardInfoGuid);\r
- ASSERT (GuidHob != NULL);\r
- \r
- pAcpiBoardInfo = (ACPI_BOARD_INFO *)GET_GUID_HOB_DATA (GuidHob); \r
- \r
- mPmTimerReg = (UINTN)pAcpiBoardInfo->PmTimerRegBase;\r
- \r
- return EFI_SUCCESS;\r
-}\r
-\r
-/**\r
- Internal function to read the current tick counter of ACPI.\r
-\r
- Internal function to read the current tick counter of ACPI.\r
-\r
- @return The tick counter read.\r
-\r
-**/\r
-UINT32\r
-InternalAcpiGetTimerTick (\r
- VOID\r
- )\r
-{\r
- if (mPmTimerReg == 0)\r
- AcpiTimerLibConstructor ();\r
- \r
- return IoRead32 (mPmTimerReg);\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
-VOID\r
-InternalAcpiDelay (\r
- IN UINT32 Delay\r
- )\r
-{\r
- UINT32 Ticks;\r
- UINT32 Times;\r
-\r
- Times = Delay >> 22;\r
- Delay &= BIT22 - 1;\r
- do {\r
- //\r
- // The target timer count is calculated here\r
- //\r
- Ticks = InternalAcpiGetTimerTick () + Delay;\r
- Delay = BIT22;\r
- //\r
- // Wait until time out\r
- // Delay >= 2^23 could not be handled by this function\r
- // Timer wrap-arounds are handled correctly by this function\r
- //\r
- while (((Ticks - InternalAcpiGetTimerTick ()) & BIT23) == 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
- InternalAcpiDelay (\r
- (UINT32)DivU64x32 (\r
- MultU64x32 (\r
- MicroSeconds,\r
- ACPI_TIMER_FREQUENCY\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
- InternalAcpiDelay (\r
- (UINT32)DivU64x32 (\r
- MultU64x32 (\r
- NanoSeconds,\r
- ACPI_TIMER_FREQUENCY\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
- 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 (StartValue != NULL) {\r
- *StartValue = 0;\r
- }\r
-\r
- if (EndValue != NULL) {\r
- *EndValue = ACPI_TIMER_COUNT_SIZE - 1;\r
- }\r
-\r
- return ACPI_TIMER_FREQUENCY;\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 Frequency;\r
- UINT64 NanoSeconds;\r
- UINT64 Remainder;\r
- INTN Shift;\r
-\r
- Frequency = GetPerformanceCounterProperties (NULL, NULL);\r
-\r
- //\r
- // Ticks\r
- // Time = --------- x 1,000,000,000\r
- // Frequency\r
- //\r
- NanoSeconds = MultU64x32 (DivU64x64Remainder (Ticks, Frequency, &Remainder), 1000000000u);\r
-\r
- //\r
- // Ensure (Remainder * 1,000,000,000) will not overflow 64-bit.\r
- // Since 2^29 < 1,000,000,000 = 0x3B9ACA00 < 2^30, Remainder should < 2^(64-30) = 2^34,\r
- // i.e. highest bit set in Remainder should <= 33.\r
- //\r
- Shift = MAX (0, HighBitSet64 (Remainder) - 33);\r
- Remainder = RShiftU64 (Remainder, (UINTN) Shift);\r
- Frequency = RShiftU64 (Frequency, (UINTN) Shift);\r
- NanoSeconds += DivU64x64Remainder (MultU64x32 (Remainder, 1000000000u), Frequency, NULL);\r
-\r
- return NanoSeconds;\r
-}\r
-\r
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