spinlock.c

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/*
 * PROJECT:         ReactOS HAL
 * LICENSE:         GPL - See COPYING in the top level directory
 * FILE:            hal/halx86/generic/spinlock.c
 * PURPOSE:         Spinlock and Queued Spinlock Support
 * PROGRAMMERS:     Alex Ionescu (alex.ionescu@reactos.org)
 */
 
/* INCLUDES ******************************************************************/
 
/* This file is compiled twice. Once for UP and once for MP */
 
#include <hal.h>
#define NDEBUG
#include <debug.h>
 
#include <internal/spinlock.h>
 
#undef KeAcquireSpinLock
#undef KeReleaseSpinLock
 
/* GLOBALS *******************************************************************/
 
ULONG_PTR HalpSystemHardwareFlags;
KSPIN_LOCK HalpSystemHardwareLock;
 
/* FUNCTIONS *****************************************************************/
 
#ifdef _M_IX86
 
#ifdef _MINIHAL_
VOID
FASTCALL
KefAcquireSpinLockAtDpcLevel(
    IN PKSPIN_LOCK SpinLock)
{
#if DBG
    /* To be on par with HAL/NTOSKRNL */
    *SpinLock = (KSPIN_LOCK)KeGetCurrentThread() | 1;
#endif
}
#endif // _MINIHAL_
 
/*
 * @implemented
 */
KIRQL
FASTCALL
KeAcquireSpinLockRaiseToSynch(PKSPIN_LOCK SpinLock)
{
    KIRQL OldIrql;
 
    /* Raise to sync */
    KeRaiseIrql(SYNCH_LEVEL, &OldIrql);
 
    /* Acquire the lock and return */
    KxAcquireSpinLock(SpinLock);
    return OldIrql;
}
 
/*
 * @implemented
 */
KIRQL
FASTCALL
KfAcquireSpinLock(PKSPIN_LOCK SpinLock)
{
    KIRQL OldIrql;
 
    /* Raise to dispatch and acquire the lock */
    KeRaiseIrql(DISPATCH_LEVEL, &OldIrql);
    KxAcquireSpinLock(SpinLock);
    return OldIrql;
}
 
/*
 * @implemented
 */
VOID
FASTCALL
KfReleaseSpinLock(PKSPIN_LOCK SpinLock,
                  KIRQL OldIrql)
{
    /* Release the lock and lower IRQL back */
    KxReleaseSpinLock(SpinLock);
    KeLowerIrql(OldIrql);
}
 
#ifndef _MINIHAL_
/*
 * @implemented
 */
KIRQL
FASTCALL
KeAcquireQueuedSpinLock(IN KSPIN_LOCK_QUEUE_NUMBER LockNumber)
{
    KIRQL OldIrql;
 
    /* Raise to dispatch */
    KeRaiseIrql(DISPATCH_LEVEL, &OldIrql);
 
    /* Acquire the lock */
    KxAcquireSpinLock(KeGetCurrentPrcb()->LockQueue[LockNumber].Lock); // HACK
    return OldIrql;
}
 
/*
 * @implemented
 */
KIRQL
FASTCALL
KeAcquireQueuedSpinLockRaiseToSynch(IN KSPIN_LOCK_QUEUE_NUMBER LockNumber)
{
    KIRQL OldIrql;
 
    /* Raise to synch */
    KeRaiseIrql(SYNCH_LEVEL, &OldIrql);
 
    /* Acquire the lock */
    KxAcquireSpinLock(KeGetCurrentPrcb()->LockQueue[LockNumber].Lock); // HACK
    return OldIrql;
}
 
/*
 * @implemented
 */
VOID
FASTCALL
KeAcquireInStackQueuedSpinLock(IN PKSPIN_LOCK SpinLock,
                               IN PKLOCK_QUEUE_HANDLE LockHandle)
{
    /* Set up the lock */
    LockHandle->LockQueue.Next = NULL;
    LockHandle->LockQueue.Lock = SpinLock;
 
    /* Raise to dispatch */
    KeRaiseIrql(DISPATCH_LEVEL, &LockHandle->OldIrql);
 
    /* Acquire the lock */
    KxAcquireSpinLock(LockHandle->LockQueue.Lock); // HACK
}
 
/*
 * @implemented
 */
VOID
FASTCALL
KeAcquireInStackQueuedSpinLockRaiseToSynch(IN PKSPIN_LOCK SpinLock,
                                           IN PKLOCK_QUEUE_HANDLE LockHandle)
{
    /* Set up the lock */
    LockHandle->LockQueue.Next = NULL;
    LockHandle->LockQueue.Lock = SpinLock;
 
    /* Raise to synch */
    KeRaiseIrql(SYNCH_LEVEL, &LockHandle->OldIrql);
 
    /* Acquire the lock */
    KxAcquireSpinLock(LockHandle->LockQueue.Lock); // HACK
}
 
/*
 * @implemented
 */
VOID
FASTCALL
KeReleaseQueuedSpinLock(IN KSPIN_LOCK_QUEUE_NUMBER LockNumber,
                        IN KIRQL OldIrql)
{
    /* Release the lock */
    KxReleaseSpinLock(KeGetCurrentPrcb()->LockQueue[LockNumber].Lock); // HACK
 
    /* Lower IRQL back */
    KeLowerIrql(OldIrql);
}
 
/*
 * @implemented
 */
VOID
FASTCALL
KeReleaseInStackQueuedSpinLock(IN PKLOCK_QUEUE_HANDLE LockHandle)
{
    /* Simply lower IRQL back */
    KxReleaseSpinLock(LockHandle->LockQueue.Lock); // HACK
    KeLowerIrql(LockHandle->OldIrql);
}
 
/*
 * @implemented
 */
BOOLEAN
FASTCALL
KeTryToAcquireQueuedSpinLockRaiseToSynch(IN KSPIN_LOCK_QUEUE_NUMBER LockNumber,
                                         IN PKIRQL OldIrql)
{
    PKSPIN_LOCK Lock = KeGetCurrentPrcb()->LockQueue[LockNumber].Lock;
 
    /* KM tests demonstrate that this raises IRQL even if locking fails */
    KeRaiseIrql(SYNCH_LEVEL, OldIrql);
    /* HACK */
    return KeTryToAcquireSpinLockAtDpcLevel(Lock);
}
 
/*
 * @implemented
 */
LOGICAL
FASTCALL
KeTryToAcquireQueuedSpinLock(IN KSPIN_LOCK_QUEUE_NUMBER LockNumber,
                             OUT PKIRQL OldIrql)
{
    PKSPIN_LOCK Lock = KeGetCurrentPrcb()->LockQueue[LockNumber].Lock;
 
    /* KM tests demonstrate that this raises IRQL even if locking fails */
    KeRaiseIrql(DISPATCH_LEVEL, OldIrql);
    /* HACK */
    return KeTryToAcquireSpinLockAtDpcLevel(Lock);
}
#endif // !_MINIHAL_
 
#endif // _M_IX86
 
VOID
NTAPI
HalpAcquireCmosSpinLock(VOID)
{
    ULONG_PTR Flags;
 
    /* Get flags and disable interrupts */
    Flags = __readeflags();
    _disable();
 
    /* Acquire the lock */
    KxAcquireSpinLock(&HalpSystemHardwareLock);
 
    /* We have the lock, save the flags now */
    HalpSystemHardwareFlags = Flags;
}
 
VOID
NTAPI
HalpReleaseCmosSpinLock(VOID)
{
    ULONG_PTR Flags;
 
    /* Get the flags */
    Flags = HalpSystemHardwareFlags;
 
    /* Release the lock */
    KxReleaseSpinLock(&HalpSystemHardwareLock);
 
    /* Restore the flags */
    __writeeflags(Flags);
}