VOID FASTCALL
HalRequestSoftwareInterrupt(IN KIRQL Request)
{
switch (Request)
{
case APC_LEVEL:
__writefsbyte(FIELD_OFFSET(KIPCR, HalReserved[HAL_APC_REQUEST]), 1);
break;
case DISPATCH_LEVEL:
__writefsbyte(FIELD_OFFSET(KIPCR, HalReserved[HAL_DPC_REQUEST]), 1);
break;
default:
ASSERT(FALSE);
}
}
FORCEINLINE
VOID
ApicSetIrql(KIRQL Irql)
{
#ifdef _M_AMD64
__writecr8(Irql);
#elif defined(APIC_LAZY_IRQL)
__writefsbyte(FIELD_OFFSET(KPCR, Irql), Irql);
#else
/* Convert IRQL and write the TPR */
ApicWrite(APIC_TPR, IrqlToTpr(Irql));
#endif
}
FORCEINLINE
VOID
ApicLowerIrql(KIRQL Irql)
{
__writefsbyte(FIELD_OFFSET(KPCR, Irql), Irql);
/* Is the new Irql lower than set in the TPR? */
if (Irql < KeGetPcr()->IRR)
{
/* Save the new hard IRQL in the IRR field */
KeGetPcr()->IRR = Irql;
/* Need to lower it back */
ApicWrite(APIC_TPR, IrqlToTpr(Irql));
}
}
VOID
HalpLowerIrql(KIRQL NewIrql, BOOLEAN FromHalEndSystemInterrupt)
{
ULONG Flags;
UCHAR DpcRequested;
if (NewIrql >= DISPATCH_LEVEL)
{
KeSetCurrentIrql (NewIrql);
APICWrite(APIC_TPR, IRQL2TPR (NewIrql) & APIC_TPR_PRI);
return;
}
Flags = __readeflags();
if (KeGetCurrentIrql() > APC_LEVEL)
{
KeSetCurrentIrql (DISPATCH_LEVEL);
APICWrite(APIC_TPR, IRQL2TPR (DISPATCH_LEVEL) & APIC_TPR_PRI);
DpcRequested = __readfsbyte(FIELD_OFFSET(KIPCR, HalReserved[HAL_DPC_REQUEST]));
if (FromHalEndSystemInterrupt || DpcRequested)
{
__writefsbyte(FIELD_OFFSET(KIPCR, HalReserved[HAL_DPC_REQUEST]), 0);
_enable();
KiDispatchInterrupt();
if (!(Flags & EFLAGS_INTERRUPT_MASK))
{
_disable();
}
}
KeSetCurrentIrql (APC_LEVEL);
}
if (NewIrql == APC_LEVEL)
{
return;
}
if (KeGetCurrentThread () != NULL &&
KeGetCurrentThread ()->ApcState.KernelApcPending)
{
_enable();
KiDeliverApc(KernelMode, NULL, NULL);
if (!(Flags & EFLAGS_INTERRUPT_MASK))
{
_disable();
}
}
KeSetCurrentIrql (PASSIVE_LEVEL);
}
VOID KeSetCurrentIrql (KIRQL NewIrql)
/*
* PURPOSE: Sets the current irq level without taking any action
*/
{
ULONG Flags;
if (NewIrql > HIGH_LEVEL)
{
DPRINT1 ("NewIrql %x\n", NewIrql);
ASSERT(FALSE);
}
Flags = __readeflags();
_disable();
__writefsbyte(FIELD_OFFSET(KPCR, Irql), NewIrql);
if (Flags & EFLAGS_INTERRUPT_MASK)
{
_enable();
}
}