diff options
Diffstat (limited to 'src/VBox/Devices/EFI/Firmware/UefiPayloadPkg/Library/AcpiTimerLib/AcpiTimerLib.c')
| -rw-r--r-- | src/VBox/Devices/EFI/Firmware/UefiPayloadPkg/Library/AcpiTimerLib/AcpiTimerLib.c | 270 |
1 files changed, 270 insertions, 0 deletions
diff --git a/src/VBox/Devices/EFI/Firmware/UefiPayloadPkg/Library/AcpiTimerLib/AcpiTimerLib.c b/src/VBox/Devices/EFI/Firmware/UefiPayloadPkg/Library/AcpiTimerLib/AcpiTimerLib.c new file mode 100644 index 00000000..5a428eae --- /dev/null +++ b/src/VBox/Devices/EFI/Firmware/UefiPayloadPkg/Library/AcpiTimerLib/AcpiTimerLib.c @@ -0,0 +1,270 @@ +/** @file + ACPI Timer implements one instance of Timer Library. + + Copyright (c) 2014, Intel Corporation. All rights reserved.<BR> + SPDX-License-Identifier: BSD-2-Clause-Patent + +**/ + +#include <PiPei.h> +#include <Library/TimerLib.h> +#include <Library/BaseLib.h> +#include <Library/IoLib.h> +#include <Library/HobLib.h> +#include <Library/DebugLib.h> + +#include <Guid/AcpiBoardInfoGuid.h> +#include <IndustryStandard/Acpi.h> + +#define ACPI_TIMER_COUNT_SIZE BIT24 + +UINTN mPmTimerReg = 0; + +/** + The constructor function enables ACPI IO space. + + If ACPI I/O space not enabled, this function will enable it. + It will always return RETURN_SUCCESS. + + @retval EFI_SUCCESS The constructor always returns RETURN_SUCCESS. + +**/ +RETURN_STATUS +EFIAPI +AcpiTimerLibConstructor ( + VOID + ) +{ + EFI_HOB_GUID_TYPE *GuidHob; + ACPI_BOARD_INFO *pAcpiBoardInfo; + + // + // Find the acpi board information guid hob + // + GuidHob = GetFirstGuidHob (&gUefiAcpiBoardInfoGuid); + ASSERT (GuidHob != NULL); + + pAcpiBoardInfo = (ACPI_BOARD_INFO *)GET_GUID_HOB_DATA (GuidHob); + + mPmTimerReg = (UINTN)pAcpiBoardInfo->PmTimerRegBase; + + return EFI_SUCCESS; +} + +/** + Internal function to read the current tick counter of ACPI. + + Internal function to read the current tick counter of ACPI. + + @return The tick counter read. + +**/ +UINT32 +InternalAcpiGetTimerTick ( + VOID + ) +{ + if (mPmTimerReg == 0) { + AcpiTimerLibConstructor (); + } + return IoRead32 (mPmTimerReg); +} + +/** + Stalls the CPU for at least the given number of ticks. + + Stalls the CPU for at least the given number of ticks. It's invoked by + MicroSecondDelay() and NanoSecondDelay(). + + @param Delay A period of time to delay in ticks. + +**/ +VOID +InternalAcpiDelay ( + IN UINT32 Delay + ) +{ + UINT32 Ticks; + UINT32 Times; + + Times = Delay >> 22; + Delay &= BIT22 - 1; + do { + // + // The target timer count is calculated here + // + Ticks = InternalAcpiGetTimerTick () + Delay; + Delay = BIT22; + // + // Wait until time out + // Delay >= 2^23 could not be handled by this function + // Timer wrap-arounds are handled correctly by this function + // + while (((Ticks - InternalAcpiGetTimerTick ()) & BIT23) == 0) { + CpuPause (); + } + } while (Times-- > 0); +} + +/** + Stalls the CPU for at least the given number of microseconds. + + Stalls the CPU for the number of microseconds specified by MicroSeconds. + + @param MicroSeconds The minimum number of microseconds to delay. + + @return MicroSeconds + +**/ +UINTN +EFIAPI +MicroSecondDelay ( + IN UINTN MicroSeconds + ) +{ + InternalAcpiDelay ( + (UINT32)DivU64x32 ( + MultU64x32 ( + MicroSeconds, + ACPI_TIMER_FREQUENCY + ), + 1000000u + ) + ); + return MicroSeconds; +} + +/** + Stalls the CPU for at least the given number of nanoseconds. + + Stalls the CPU for the number of nanoseconds specified by NanoSeconds. + + @param NanoSeconds The minimum number of nanoseconds to delay. + + @return NanoSeconds + +**/ +UINTN +EFIAPI +NanoSecondDelay ( + IN UINTN NanoSeconds + ) +{ + InternalAcpiDelay ( + (UINT32)DivU64x32 ( + MultU64x32 ( + NanoSeconds, + ACPI_TIMER_FREQUENCY + ), + 1000000000u + ) + ); + return NanoSeconds; +} + +/** + Retrieves the current value of a 64-bit free running performance counter. + + Retrieves the current value of a 64-bit free running performance counter. The + counter can either count up by 1 or count down by 1. If the physical + performance counter counts by a larger increment, then the counter values + must be translated. The properties of the counter can be retrieved from + GetPerformanceCounterProperties(). + + @return The current value of the free running performance counter. + +**/ +UINT64 +EFIAPI +GetPerformanceCounter ( + VOID + ) +{ + return (UINT64)InternalAcpiGetTimerTick (); +} + +/** + Retrieves the 64-bit frequency in Hz and the range of performance counter + values. + + If StartValue is not NULL, then the value that the performance counter starts + with immediately after is it rolls over is returned in StartValue. If + EndValue is not NULL, then the value that the performance counter end with + immediately before it rolls over is returned in EndValue. The 64-bit + frequency of the performance counter in Hz is always returned. If StartValue + is less than EndValue, then the performance counter counts up. If StartValue + is greater than EndValue, then the performance counter counts down. For + example, a 64-bit free running counter that counts up would have a StartValue + of 0 and an EndValue of 0xFFFFFFFFFFFFFFFF. A 24-bit free running counter + that counts down would have a StartValue of 0xFFFFFF and an EndValue of 0. + + @param StartValue The value the performance counter starts with when it + rolls over. + @param EndValue The value that the performance counter ends with before + it rolls over. + + @return The frequency in Hz. + +**/ +UINT64 +EFIAPI +GetPerformanceCounterProperties ( + OUT UINT64 *StartValue, OPTIONAL + OUT UINT64 *EndValue OPTIONAL + ) +{ + if (StartValue != NULL) { + *StartValue = 0; + } + + if (EndValue != NULL) { + *EndValue = ACPI_TIMER_COUNT_SIZE - 1; + } + + return ACPI_TIMER_FREQUENCY; +} + +/** + Converts elapsed ticks of performance counter to time in nanoseconds. + + This function converts the elapsed ticks of running performance counter to + time value in unit of nanoseconds. + + @param Ticks The number of elapsed ticks of running performance counter. + + @return The elapsed time in nanoseconds. + +**/ +UINT64 +EFIAPI +GetTimeInNanoSecond ( + IN UINT64 Ticks + ) +{ + UINT64 Frequency; + UINT64 NanoSeconds; + UINT64 Remainder; + INTN Shift; + + Frequency = GetPerformanceCounterProperties (NULL, NULL); + + // + // Ticks + // Time = --------- x 1,000,000,000 + // Frequency + // + NanoSeconds = MultU64x32 (DivU64x64Remainder (Ticks, Frequency, &Remainder), 1000000000u); + + // + // Ensure (Remainder * 1,000,000,000) will not overflow 64-bit. + // Since 2^29 < 1,000,000,000 = 0x3B9ACA00 < 2^30, Remainder should < 2^(64-30) = 2^34, + // i.e. highest bit set in Remainder should <= 33. + // + Shift = MAX (0, HighBitSet64 (Remainder) - 33); + Remainder = RShiftU64 (Remainder, (UINTN) Shift); + Frequency = RShiftU64 (Frequency, (UINTN) Shift); + NanoSeconds += DivU64x64Remainder (MultU64x32 (Remainder, 1000000000u), Frequency, NULL); + + return NanoSeconds; +} + |