mirror of https://github.com/acidanthera/audk.git
277 lines
7.2 KiB
C
277 lines
7.2 KiB
C
/** @file
|
|
ACPI Timer implements one instance of Timer Library.
|
|
|
|
Copyright (c) 2014, Intel Corporation. All rights reserved.<BR>
|
|
This program and the accompanying materials are
|
|
licensed and made available under the terms and conditions of the BSD License
|
|
which accompanies this distribution. The full text of the license may be found at
|
|
http://opensource.org/licenses/bsd-license.php
|
|
|
|
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
|
|
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
|
|
|
|
**/
|
|
|
|
#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;
|
|
}
|
|
|