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https://github.com/CloverHackyColor/CloverBootloader.git
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282 lines
7.6 KiB
C
282 lines
7.6 KiB
C
/** @file
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Timer Library functions built upon ACPI on IA32/x64.
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ACPI power management timer is a 24-bit or 32-bit fixed rate free running count-up
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timer that runs off a 3.579545 MHz clock.
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When startup, Duet will check the FADT to determine whether the PM timer is a
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32-bit or 24-bit timer.
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Copyright (c) 2006 - 2011, Intel Corporation. All rights reserved.<BR>
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This program and the accompanying materials
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are licensed and made available under the terms and conditions of the BSD License
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which accompanies this distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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**/
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#include <Base.h>
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#include <Library/TimerLib.h>
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#include <Library/BaseLib.h>
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//#include <Library/DebugLib.h>
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#include <Library/HobLib.h>
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#include <Guid/AcpiDescription.h>
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#include <Library/IoLib.h>
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#include <Library/PciLib.h>
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EFI_ACPI_DESCRIPTION *gAcpiDesc = NULL;
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/**
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Internal function to get Acpi information from HOB.
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@return Pointer to ACPI description structure.
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**/
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EFI_ACPI_DESCRIPTION*
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InternalGetApciDescrptionTable (
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VOID
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)
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{
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EFI_PEI_HOB_POINTERS GuidHob;
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if (gAcpiDesc != NULL) {
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return gAcpiDesc;
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}
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GuidHob.Raw = GetFirstGuidHob (&gEfiAcpiDescriptionGuid);
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if (GuidHob.Raw != NULL) {
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gAcpiDesc = GET_GUID_HOB_DATA (GuidHob.Guid);
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// DEBUG ((EFI_D_INFO, "ACPI Timer: PM_TMR_BLK.RegisterBitWidth = 0x%X\n", gAcpiDesc->PM_TMR_BLK.RegisterBitWidth));
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// DEBUG ((EFI_D_INFO, "ACPI Timer: PM_TMR_BLK.Address = 0x%X\n", gAcpiDesc->PM_TMR_BLK.Address));
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return gAcpiDesc;
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} else {
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// DEBUG ((EFI_D_ERROR, "Fail to get Acpi description table from hob\n"));
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return NULL;
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}
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}
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/**
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Internal function to read the current tick counter of ACPI.
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@return The tick counter read.
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**/
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STATIC
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UINT32
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InternalAcpiGetTimerTick (
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VOID
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)
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{
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return IoRead32 ((UINTN)gAcpiDesc->PM_TMR_BLK.Address);
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}
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/**
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Stalls the CPU for at least the given number of ticks.
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Stalls the CPU for at least the given number of ticks. It's invoked by
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MicroSecondDelay() and NanoSecondDelay().
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@param Delay A period of time to delay in ticks.
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**/
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STATIC
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VOID
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InternalAcpiDelay (
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IN UINT32 Delay
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)
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{
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UINT32 Ticks;
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UINT32 Times;
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Times = Delay >> (gAcpiDesc->PM_TMR_BLK.RegisterBitWidth - 2);
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Delay &= (1 << (gAcpiDesc->PM_TMR_BLK.RegisterBitWidth - 2)) - 1;
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do {
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//
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// The target timer count is calculated here
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//
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Ticks = InternalAcpiGetTimerTick () + Delay;
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Delay = 1 << (gAcpiDesc->PM_TMR_BLK.RegisterBitWidth - 2);
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//
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// Wait until time out
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// Delay >= 2^23 (if ACPI provide 24-bit timer) or Delay >= 2^31 (if ACPI
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// provide 32-bit timer) could not be handled by this function
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// Timer wrap-arounds are handled correctly by this function
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//
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while (((Ticks - InternalAcpiGetTimerTick ()) & (1 << (gAcpiDesc->PM_TMR_BLK.RegisterBitWidth - 1))) == 0) {
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CpuPause ();
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}
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} while (Times-- > 0);
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}
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/**
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Stalls the CPU for at least the given number of microseconds.
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Stalls the CPU for the number of microseconds specified by MicroSeconds.
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@param MicroSeconds The minimum number of microseconds to delay.
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@return MicroSeconds
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**/
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UINTN
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EFIAPI
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MicroSecondDelay (
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IN UINTN MicroSeconds
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)
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{
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if (InternalGetApciDescrptionTable() == NULL) {
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return MicroSeconds;
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}
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InternalAcpiDelay (
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(UINT32)DivU64x32 (
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MultU64x32 (
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MicroSeconds,
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3579545
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),
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1000000u
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)
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);
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return MicroSeconds;
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}
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/**
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Stalls the CPU for at least the given number of nanoseconds.
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Stalls the CPU for the number of nanoseconds specified by NanoSeconds.
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@param NanoSeconds The minimum number of nanoseconds to delay.
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@return NanoSeconds
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**/
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UINTN
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EFIAPI
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NanoSecondDelay (
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IN UINTN NanoSeconds
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)
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{
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if (InternalGetApciDescrptionTable() == NULL) {
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return NanoSeconds;
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}
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InternalAcpiDelay (
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(UINT32)DivU64x32 (
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MultU64x32 (
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NanoSeconds,
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3579545
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),
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1000000000u
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)
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);
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return NanoSeconds;
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}
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/**
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Retrieves the current value of a 64-bit free running performance counter.
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Retrieves the current value of a 64-bit free running performance counter. The
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counter can either count up by 1 or count down by 1. If the physical
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performance counter counts by a larger increment, then the counter values
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must be translated. The properties of the counter can be retrieved from
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GetPerformanceCounterProperties().
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@return The current value of the free running performance counter.
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**/
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UINT64
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EFIAPI
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GetPerformanceCounter (
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VOID
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)
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{
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if (InternalGetApciDescrptionTable() == NULL) {
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return 0;
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}
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return (UINT64)InternalAcpiGetTimerTick ();
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}
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/**
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Retrieves the 64-bit frequency in Hz and the range of performance counter
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values.
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If StartValue is not NULL, then the value that the performance counter starts
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with immediately after is it rolls over is returned in StartValue. If
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EndValue is not NULL, then the value that the performance counter end with
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immediately before it rolls over is returned in EndValue. The 64-bit
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frequency of the performance counter in Hz is always returned. If StartValue
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is less than EndValue, then the performance counter counts up. If StartValue
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is greater than EndValue, then the performance counter counts down. For
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example, a 64-bit free running counter that counts up would have a StartValue
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of 0 and an EndValue of 0xFFFFFFFFFFFFFFFF. A 24-bit free running counter
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that counts down would have a StartValue of 0xFFFFFF and an EndValue of 0.
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@param StartValue The value the performance counter starts with when it
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rolls over.
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@param EndValue The value that the performance counter ends with before
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it rolls over.
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@return The frequency in Hz.
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**/
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UINT64
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EFIAPI
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GetPerformanceCounterProperties (
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OUT UINT64 *StartValue, OPTIONAL
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OUT UINT64 *EndValue OPTIONAL
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)
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{
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if (InternalGetApciDescrptionTable() == NULL) {
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return 0;
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}
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if (StartValue != NULL) {
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*StartValue = 0;
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}
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if (EndValue != NULL) {
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*EndValue = (1 << gAcpiDesc->PM_TMR_BLK.RegisterBitWidth) - 1;
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}
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return 3579545;
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}
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/**
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Converts elapsed ticks of performance counter to time in nanoseconds.
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This function converts the elapsed ticks of running performance counter to
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time value in unit of nanoseconds.
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@param Ticks The number of elapsed ticks of running performance counter.
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@return The elapsed time in nanoseconds.
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**/
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UINT64
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EFIAPI
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GetTimeInNanoSecond (
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IN UINT64 Ticks
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)
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{
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UINT64 NanoSeconds;
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UINT32 Remainder;
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//
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// Ticks
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// Time = --------- x 1,000,000,000
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// Frequency
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//
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NanoSeconds = MultU64x32 (DivU64x32Remainder (Ticks, 3579545, &Remainder), 1000000000u);
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//
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// Frequency < 0x100000000, so Remainder < 0x100000000, then (Remainder * 1,000,000,000)
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// will not overflow 64-bit.
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//
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NanoSeconds += DivU64x32 (MultU64x32 ((UINT64) Remainder, 1000000000u), 3579545);
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return NanoSeconds;
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}
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