mirror of https://github.com/acidanthera/audk.git
370 lines
9.9 KiB
C
370 lines
9.9 KiB
C
/** @file
|
|
Timer Library functions built upon local APIC on IA32/x64.
|
|
|
|
Copyright (c) 2006 - 2015, Intel Corporation. All rights reserved.<BR>
|
|
SPDX-License-Identifier: BSD-2-Clause-Patent
|
|
|
|
**/
|
|
|
|
#include <Base.h>
|
|
#include <Library/TimerLib.h>
|
|
#include <Library/BaseLib.h>
|
|
#include <Library/IoLib.h>
|
|
#include <Library/PcdLib.h>
|
|
#include <Library/DebugLib.h>
|
|
|
|
#define APIC_SVR 0x0f0
|
|
#define APIC_LVTERR 0x370
|
|
#define APIC_TMICT 0x380
|
|
#define APIC_TMCCT 0x390
|
|
#define APIC_TDCR 0x3e0
|
|
|
|
//
|
|
// The following array is used in calculating the frequency of local APIC
|
|
// timer. Refer to IA-32 developers' manual for more details.
|
|
//
|
|
GLOBAL_REMOVE_IF_UNREFERENCED
|
|
CONST UINT8 mTimerLibLocalApicDivisor[] = {
|
|
0x02, 0x04, 0x08, 0x10,
|
|
0x02, 0x04, 0x08, 0x10,
|
|
0x20, 0x40, 0x80, 0x01,
|
|
0x20, 0x40, 0x80, 0x01
|
|
};
|
|
|
|
/**
|
|
Internal function to retrieve the base address of local APIC.
|
|
|
|
This function will ASSERT if:
|
|
The local APIC is not globally enabled.
|
|
The local APIC is not working under XAPIC mode.
|
|
The local APIC is not software enabled.
|
|
|
|
@return The base address of local APIC
|
|
|
|
**/
|
|
UINTN
|
|
EFIAPI
|
|
InternalX86GetApicBase (
|
|
VOID
|
|
)
|
|
{
|
|
UINTN MsrValue;
|
|
UINTN ApicBase;
|
|
|
|
MsrValue = (UINTN) AsmReadMsr64 (27);
|
|
ApicBase = MsrValue & 0xffffff000ULL;
|
|
|
|
//
|
|
// Check the APIC Global Enable bit (bit 11) in IA32_APIC_BASE MSR.
|
|
// This bit will be 1, if local APIC is globally enabled.
|
|
//
|
|
ASSERT ((MsrValue & BIT11) != 0);
|
|
|
|
//
|
|
// Check the APIC Extended Mode bit (bit 10) in IA32_APIC_BASE MSR.
|
|
// This bit will be 0, if local APIC is under XAPIC mode.
|
|
//
|
|
ASSERT ((MsrValue & BIT10) == 0);
|
|
|
|
//
|
|
// Check the APIC Software Enable/Disable bit (bit 8) in Spurious-Interrupt
|
|
// Vector Register.
|
|
// This bit will be 1, if local APIC is software enabled.
|
|
//
|
|
ASSERT ((MmioRead32 (ApicBase + APIC_SVR) & BIT8) != 0);
|
|
|
|
return ApicBase;
|
|
}
|
|
|
|
/**
|
|
Internal function to return the frequency of the local APIC timer.
|
|
|
|
@param ApicBase The base address of memory mapped registers of local APIC.
|
|
|
|
@return The frequency of the timer in Hz.
|
|
|
|
**/
|
|
UINT32
|
|
EFIAPI
|
|
InternalX86GetTimerFrequency (
|
|
IN UINTN ApicBase
|
|
)
|
|
{
|
|
return
|
|
PcdGet32(PcdFSBClock) /
|
|
mTimerLibLocalApicDivisor[MmioBitFieldRead32 (ApicBase + APIC_TDCR, 0, 3)];
|
|
}
|
|
|
|
/**
|
|
Internal function to read the current tick counter of local APIC.
|
|
|
|
@param ApicBase The base address of memory mapped registers of local APIC.
|
|
|
|
@return The tick counter read.
|
|
|
|
**/
|
|
INT32
|
|
EFIAPI
|
|
InternalX86GetTimerTick (
|
|
IN UINTN ApicBase
|
|
)
|
|
{
|
|
return MmioRead32 (ApicBase + APIC_TMCCT);
|
|
}
|
|
|
|
/**
|
|
Internal function to read the initial timer count of local APIC.
|
|
|
|
@param ApicBase The base address of memory mapped registers of local APIC.
|
|
|
|
@return The initial timer count read.
|
|
|
|
**/
|
|
UINT32
|
|
InternalX86GetInitTimerCount (
|
|
IN UINTN ApicBase
|
|
)
|
|
{
|
|
return MmioRead32 (ApicBase + APIC_TMICT);
|
|
}
|
|
|
|
/**
|
|
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().
|
|
|
|
This function will ASSERT if the APIC timer intial count returned from
|
|
InternalX86GetInitTimerCount() is zero.
|
|
|
|
@param ApicBase The base address of memory mapped registers of local APIC.
|
|
@param Delay A period of time to delay in ticks.
|
|
|
|
**/
|
|
VOID
|
|
EFIAPI
|
|
InternalX86Delay (
|
|
IN UINTN ApicBase,
|
|
IN UINT32 Delay
|
|
)
|
|
{
|
|
INT32 Ticks;
|
|
UINT32 Times;
|
|
UINT32 InitCount;
|
|
UINT32 StartTick;
|
|
|
|
//
|
|
// In case Delay is too larger, separate it into several small delay slot.
|
|
// Devided Delay by half value of Init Count is to avoid Delay close to
|
|
// the Init Count, timeout maybe missing if the time consuming between 2
|
|
// GetApicTimerCurrentCount() invoking is larger than the time gap between
|
|
// Delay and the Init Count.
|
|
//
|
|
InitCount = InternalX86GetInitTimerCount (ApicBase);
|
|
ASSERT (InitCount != 0);
|
|
Times = Delay / (InitCount / 2);
|
|
Delay = Delay % (InitCount / 2);
|
|
|
|
//
|
|
// Get Start Tick and do delay
|
|
//
|
|
StartTick = InternalX86GetTimerTick (ApicBase);
|
|
do {
|
|
//
|
|
// Wait until time out by Delay value
|
|
//
|
|
do {
|
|
CpuPause ();
|
|
//
|
|
// Get Ticks from Start to Current.
|
|
//
|
|
Ticks = StartTick - InternalX86GetTimerTick (ApicBase);
|
|
//
|
|
// Ticks < 0 means Timer wrap-arounds happens.
|
|
//
|
|
if (Ticks < 0) {
|
|
Ticks += InitCount;
|
|
}
|
|
} while ((UINT32)Ticks < Delay);
|
|
|
|
//
|
|
// Update StartTick and Delay for next delay slot
|
|
//
|
|
StartTick -= (StartTick > Delay) ? Delay : (Delay - InitCount);
|
|
Delay = InitCount / 2;
|
|
} 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 The value of MicroSeconds inputted.
|
|
|
|
**/
|
|
UINTN
|
|
EFIAPI
|
|
MicroSecondDelay (
|
|
IN UINTN MicroSeconds
|
|
)
|
|
{
|
|
UINTN ApicBase;
|
|
|
|
ApicBase = InternalX86GetApicBase ();
|
|
InternalX86Delay (
|
|
ApicBase,
|
|
(UINT32)DivU64x32 (
|
|
MultU64x64 (
|
|
InternalX86GetTimerFrequency (ApicBase),
|
|
MicroSeconds
|
|
),
|
|
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 The value of NanoSeconds inputted.
|
|
|
|
**/
|
|
UINTN
|
|
EFIAPI
|
|
NanoSecondDelay (
|
|
IN UINTN NanoSeconds
|
|
)
|
|
{
|
|
UINTN ApicBase;
|
|
|
|
ApicBase = InternalX86GetApicBase ();
|
|
InternalX86Delay (
|
|
ApicBase,
|
|
(UINT32)DivU64x32 (
|
|
MultU64x64 (
|
|
InternalX86GetTimerFrequency (ApicBase),
|
|
NanoSeconds
|
|
),
|
|
1000000000u
|
|
)
|
|
);
|
|
return NanoSeconds;
|
|
}
|
|
|
|
/**
|
|
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)(UINT32)InternalX86GetTimerTick (InternalX86GetApicBase ());
|
|
}
|
|
|
|
/**
|
|
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
|
|
)
|
|
{
|
|
UINTN ApicBase;
|
|
|
|
ApicBase = InternalX86GetApicBase ();
|
|
|
|
if (StartValue != NULL) {
|
|
*StartValue = (UINT64)InternalX86GetInitTimerCount (ApicBase);
|
|
}
|
|
|
|
if (EndValue != NULL) {
|
|
*EndValue = 0;
|
|
}
|
|
|
|
return (UINT64) InternalX86GetTimerFrequency (ApicBase);
|
|
}
|
|
|
|
/**
|
|
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;
|
|
}
|