mirror of
https://github.com/CloverHackyColor/CloverBootloader.git
synced 2024-11-24 11:45:27 +01:00
427 lines
12 KiB
C
427 lines
12 KiB
C
/** @file
|
|
Implementation of synchronization functions.
|
|
|
|
Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>
|
|
Portions copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>
|
|
SPDX-License-Identifier: BSD-2-Clause-Patent
|
|
|
|
**/
|
|
|
|
#include "BaseSynchronizationLibInternals.h"
|
|
|
|
//
|
|
// GCC inline assembly for Read Write Barrier
|
|
//
|
|
#define _ReadWriteBarrier() do { __asm__ __volatile__ ("": : : "memory"); } while(0)
|
|
|
|
#define SPIN_LOCK_RELEASED ((UINTN) 1)
|
|
#define SPIN_LOCK_ACQUIRED ((UINTN) 2)
|
|
|
|
/**
|
|
Retrieves the architecture specific spin lock alignment requirements for
|
|
optimal spin lock performance.
|
|
|
|
This function retrieves the spin lock alignment requirements for optimal
|
|
performance on a given CPU architecture. The spin lock alignment is byte alignment.
|
|
It must be a power of two and is returned by this function. If there are no alignment
|
|
requirements, then 1 must be returned. The spin lock synchronization
|
|
functions must function correctly if the spin lock size and alignment values
|
|
returned by this function are not used at all. These values are hints to the
|
|
consumers of the spin lock synchronization functions to obtain optimal spin
|
|
lock performance.
|
|
|
|
@return The architecture specific spin lock alignment.
|
|
|
|
**/
|
|
UINTN
|
|
EFIAPI
|
|
GetSpinLockProperties (
|
|
VOID
|
|
)
|
|
{
|
|
return InternalGetSpinLockProperties ();
|
|
}
|
|
|
|
/**
|
|
Initializes a spin lock to the released state and returns the spin lock.
|
|
|
|
This function initializes the spin lock specified by SpinLock to the released
|
|
state, and returns SpinLock. Optimal performance can be achieved by calling
|
|
GetSpinLockProperties() to determine the size and alignment requirements for
|
|
SpinLock.
|
|
|
|
If SpinLock is NULL, then ASSERT().
|
|
|
|
@param SpinLock A pointer to the spin lock to initialize to the released
|
|
state.
|
|
|
|
@return SpinLock is in release state.
|
|
|
|
**/
|
|
SPIN_LOCK *
|
|
EFIAPI
|
|
InitializeSpinLock (
|
|
OUT SPIN_LOCK *SpinLock
|
|
)
|
|
{
|
|
ASSERT (SpinLock != NULL);
|
|
|
|
_ReadWriteBarrier();
|
|
*SpinLock = SPIN_LOCK_RELEASED;
|
|
_ReadWriteBarrier();
|
|
|
|
return SpinLock;
|
|
}
|
|
|
|
/**
|
|
Waits until a spin lock can be placed in the acquired state.
|
|
|
|
This function checks the state of the spin lock specified by SpinLock. If
|
|
SpinLock is in the released state, then this function places SpinLock in the
|
|
acquired state and returns SpinLock. Otherwise, this function waits
|
|
indefinitely for the spin lock to be released, and then places it in the
|
|
acquired state and returns SpinLock. All state transitions of SpinLock must
|
|
be performed using MP safe mechanisms.
|
|
|
|
If SpinLock is NULL, then ASSERT().
|
|
If SpinLock was not initialized with InitializeSpinLock(), then ASSERT().
|
|
If PcdSpinLockTimeout is not zero, and SpinLock is can not be acquired in
|
|
PcdSpinLockTimeout microseconds, then ASSERT().
|
|
|
|
@param SpinLock A pointer to the spin lock to place in the acquired state.
|
|
|
|
@return SpinLock acquired the lock.
|
|
|
|
**/
|
|
SPIN_LOCK *
|
|
EFIAPI
|
|
AcquireSpinLock (
|
|
IN OUT SPIN_LOCK *SpinLock
|
|
)
|
|
{
|
|
UINT64 Current;
|
|
UINT64 Previous;
|
|
UINT64 Total;
|
|
UINT64 Start;
|
|
UINT64 End;
|
|
UINT64 Timeout;
|
|
INT64 Cycle;
|
|
INT64 Delta;
|
|
|
|
if (PcdGet32 (PcdSpinLockTimeout) == 0) {
|
|
while (!AcquireSpinLockOrFail (SpinLock)) {
|
|
CpuPause ();
|
|
}
|
|
} else if (!AcquireSpinLockOrFail (SpinLock)) {
|
|
//
|
|
// Get the current timer value
|
|
//
|
|
Current = GetPerformanceCounter();
|
|
|
|
//
|
|
// Initialize local variables
|
|
//
|
|
Start = 0;
|
|
End = 0;
|
|
Total = 0;
|
|
|
|
//
|
|
// Retrieve the performance counter properties and compute the number of performance
|
|
// counter ticks required to reach the timeout
|
|
//
|
|
Timeout = DivU64x32 (
|
|
MultU64x32 (
|
|
GetPerformanceCounterProperties (&Start, &End),
|
|
PcdGet32 (PcdSpinLockTimeout)
|
|
),
|
|
1000000
|
|
);
|
|
Cycle = End - Start;
|
|
if (Cycle < 0) {
|
|
Cycle = -Cycle;
|
|
}
|
|
Cycle++;
|
|
|
|
while (!AcquireSpinLockOrFail (SpinLock)) {
|
|
CpuPause ();
|
|
Previous = Current;
|
|
Current = GetPerformanceCounter();
|
|
Delta = (INT64) (Current - Previous);
|
|
if (Start > End) {
|
|
Delta = -Delta;
|
|
}
|
|
if (Delta < 0) {
|
|
Delta += Cycle;
|
|
}
|
|
Total += Delta;
|
|
ASSERT (Total < Timeout);
|
|
}
|
|
}
|
|
return SpinLock;
|
|
}
|
|
|
|
/**
|
|
Attempts to place a spin lock in the acquired state.
|
|
|
|
This function checks the state of the spin lock specified by SpinLock. If
|
|
SpinLock is in the released state, then this function places SpinLock in the
|
|
acquired state and returns TRUE. Otherwise, FALSE is returned. All state
|
|
transitions of SpinLock must be performed using MP safe mechanisms.
|
|
|
|
If SpinLock is NULL, then ASSERT().
|
|
If SpinLock was not initialized with InitializeSpinLock(), then ASSERT().
|
|
|
|
@param SpinLock A pointer to the spin lock to place in the acquired state.
|
|
|
|
@retval TRUE SpinLock was placed in the acquired state.
|
|
@retval FALSE SpinLock could not be acquired.
|
|
|
|
**/
|
|
BOOLEAN
|
|
EFIAPI
|
|
AcquireSpinLockOrFail (
|
|
IN OUT SPIN_LOCK *SpinLock
|
|
)
|
|
{
|
|
SPIN_LOCK LockValue;
|
|
VOID *Result;
|
|
|
|
ASSERT (SpinLock != NULL);
|
|
|
|
LockValue = *SpinLock;
|
|
ASSERT (LockValue == SPIN_LOCK_ACQUIRED || LockValue == SPIN_LOCK_RELEASED);
|
|
|
|
_ReadWriteBarrier ();
|
|
Result = InterlockedCompareExchangePointer (
|
|
(VOID**)SpinLock,
|
|
(VOID*)SPIN_LOCK_RELEASED,
|
|
(VOID*)SPIN_LOCK_ACQUIRED
|
|
);
|
|
|
|
_ReadWriteBarrier ();
|
|
return (BOOLEAN) (Result == (VOID*) SPIN_LOCK_RELEASED);
|
|
}
|
|
|
|
/**
|
|
Releases a spin lock.
|
|
|
|
This function places the spin lock specified by SpinLock in the release state
|
|
and returns SpinLock.
|
|
|
|
If SpinLock is NULL, then ASSERT().
|
|
If SpinLock was not initialized with InitializeSpinLock(), then ASSERT().
|
|
|
|
@param SpinLock A pointer to the spin lock to release.
|
|
|
|
@return SpinLock released the lock.
|
|
|
|
**/
|
|
SPIN_LOCK *
|
|
EFIAPI
|
|
ReleaseSpinLock (
|
|
IN OUT SPIN_LOCK *SpinLock
|
|
)
|
|
{
|
|
SPIN_LOCK LockValue;
|
|
|
|
ASSERT (SpinLock != NULL);
|
|
|
|
LockValue = *SpinLock;
|
|
ASSERT (LockValue == SPIN_LOCK_ACQUIRED || LockValue == SPIN_LOCK_RELEASED);
|
|
|
|
_ReadWriteBarrier ();
|
|
*SpinLock = SPIN_LOCK_RELEASED;
|
|
_ReadWriteBarrier ();
|
|
|
|
return SpinLock;
|
|
}
|
|
|
|
/**
|
|
Performs an atomic increment of an 32-bit unsigned integer.
|
|
|
|
Performs an atomic increment of the 32-bit unsigned integer specified by
|
|
Value and returns the incremented value. The increment operation must be
|
|
performed using MP safe mechanisms.
|
|
|
|
If Value is NULL, then ASSERT().
|
|
|
|
@param Value A pointer to the 32-bit value to increment.
|
|
|
|
@return The incremented value.
|
|
|
|
**/
|
|
UINT32
|
|
EFIAPI
|
|
InterlockedIncrement (
|
|
IN volatile UINT32 *Value
|
|
)
|
|
{
|
|
ASSERT (Value != NULL);
|
|
return InternalSyncIncrement (Value);
|
|
}
|
|
|
|
/**
|
|
Performs an atomic decrement of an 32-bit unsigned integer.
|
|
|
|
Performs an atomic decrement of the 32-bit unsigned integer specified by
|
|
Value and returns the decremented value. The decrement operation must be
|
|
performed using MP safe mechanisms.
|
|
|
|
If Value is NULL, then ASSERT().
|
|
|
|
@param Value A pointer to the 32-bit value to decrement.
|
|
|
|
@return The decremented value.
|
|
|
|
**/
|
|
UINT32
|
|
EFIAPI
|
|
InterlockedDecrement (
|
|
IN volatile UINT32 *Value
|
|
)
|
|
{
|
|
ASSERT (Value != NULL);
|
|
return InternalSyncDecrement (Value);
|
|
}
|
|
|
|
/**
|
|
Performs an atomic compare exchange operation on a 16-bit unsigned integer.
|
|
|
|
Performs an atomic compare exchange operation on the 16-bit unsigned integer
|
|
specified by Value. If Value is equal to CompareValue, then Value is set to
|
|
ExchangeValue and CompareValue is returned. If Value is not equal to CompareValue,
|
|
then Value is returned. The compare exchange operation must be performed using
|
|
MP safe mechanisms.
|
|
|
|
If Value is NULL, then ASSERT().
|
|
|
|
@param Value A pointer to the 16-bit value for the compare exchange
|
|
operation.
|
|
@param CompareValue A 16-bit value used in compare operation.
|
|
@param ExchangeValue A 16-bit value used in exchange operation.
|
|
|
|
@return The original *Value before exchange.
|
|
|
|
**/
|
|
UINT16
|
|
EFIAPI
|
|
InterlockedCompareExchange16 (
|
|
IN OUT volatile UINT16 *Value,
|
|
IN UINT16 CompareValue,
|
|
IN UINT16 ExchangeValue
|
|
)
|
|
{
|
|
ASSERT (Value != NULL);
|
|
return InternalSyncCompareExchange16 (Value, CompareValue, ExchangeValue);
|
|
}
|
|
|
|
/**
|
|
Performs an atomic compare exchange operation on a 32-bit unsigned integer.
|
|
|
|
Performs an atomic compare exchange operation on the 32-bit unsigned integer
|
|
specified by Value. If Value is equal to CompareValue, then Value is set to
|
|
ExchangeValue and CompareValue is returned. If Value is not equal to CompareValue,
|
|
then Value is returned. The compare exchange operation must be performed using
|
|
MP safe mechanisms.
|
|
|
|
If Value is NULL, then ASSERT().
|
|
|
|
@param Value A pointer to the 32-bit value for the compare exchange
|
|
operation.
|
|
@param CompareValue A 32-bit value used in compare operation.
|
|
@param ExchangeValue A 32-bit value used in exchange operation.
|
|
|
|
@return The original *Value before exchange.
|
|
|
|
**/
|
|
UINT32
|
|
EFIAPI
|
|
InterlockedCompareExchange32 (
|
|
IN OUT volatile UINT32 *Value,
|
|
IN UINT32 CompareValue,
|
|
IN UINT32 ExchangeValue
|
|
)
|
|
{
|
|
ASSERT (Value != NULL);
|
|
return InternalSyncCompareExchange32 (Value, CompareValue, ExchangeValue);
|
|
}
|
|
|
|
/**
|
|
Performs an atomic compare exchange operation on a 64-bit unsigned integer.
|
|
|
|
Performs an atomic compare exchange operation on the 64-bit unsigned integer specified
|
|
by Value. If Value is equal to CompareValue, then Value is set to ExchangeValue and
|
|
CompareValue is returned. If Value is not equal to CompareValue, then Value is returned.
|
|
The compare exchange operation must be performed using MP safe mechanisms.
|
|
|
|
If Value is NULL, then ASSERT().
|
|
|
|
@param Value A pointer to the 64-bit value for the compare exchange
|
|
operation.
|
|
@param CompareValue A 64-bit value used in a compare operation.
|
|
@param ExchangeValue A 64-bit value used in an exchange operation.
|
|
|
|
@return The original *Value before exchange.
|
|
|
|
**/
|
|
UINT64
|
|
EFIAPI
|
|
InterlockedCompareExchange64 (
|
|
IN OUT volatile UINT64 *Value,
|
|
IN UINT64 CompareValue,
|
|
IN UINT64 ExchangeValue
|
|
)
|
|
{
|
|
ASSERT (Value != NULL);
|
|
return InternalSyncCompareExchange64 (Value, CompareValue, ExchangeValue);
|
|
}
|
|
|
|
/**
|
|
Performs an atomic compare exchange operation on a pointer value.
|
|
|
|
Performs an atomic compare exchange operation on the pointer value specified
|
|
by Value. If Value is equal to CompareValue, then Value is set to
|
|
ExchangeValue and CompareValue is returned. If Value is not equal to
|
|
CompareValue, then Value is returned. The compare exchange operation must be
|
|
performed using MP safe mechanisms.
|
|
|
|
If Value is NULL, then ASSERT().
|
|
|
|
@param Value A pointer to the pointer value for the compare exchange
|
|
operation.
|
|
@param CompareValue A pointer value used in a compare operation.
|
|
@param ExchangeValue A pointer value used in an exchange operation.
|
|
|
|
@return The original *Value before exchange.
|
|
**/
|
|
VOID *
|
|
EFIAPI
|
|
InterlockedCompareExchangePointer (
|
|
IN OUT VOID * volatile *Value,
|
|
IN VOID *CompareValue,
|
|
IN VOID *ExchangeValue
|
|
)
|
|
{
|
|
UINT8 SizeOfValue;
|
|
|
|
SizeOfValue = sizeof (*Value);
|
|
|
|
switch (SizeOfValue) {
|
|
case sizeof (UINT32):
|
|
return (VOID*)(UINTN)InterlockedCompareExchange32 (
|
|
(volatile UINT32 *)Value,
|
|
(UINT32)(UINTN)CompareValue,
|
|
(UINT32)(UINTN)ExchangeValue
|
|
);
|
|
case sizeof (UINT64):
|
|
return (VOID*)(UINTN)InterlockedCompareExchange64 (
|
|
(volatile UINT64 *)Value,
|
|
(UINT64)(UINTN)CompareValue,
|
|
(UINT64)(UINTN)ExchangeValue
|
|
);
|
|
default:
|
|
ASSERT (FALSE);
|
|
return NULL;
|
|
}
|
|
}
|