/**
EFI_CPU_INTERRUPT_HANDLER that is called when a processor interrupt occurs.
@param InterruptType Defines the type of interrupt or exception that
occurred on the processor.This parameter is processor architecture specific.
@param SystemContext A pointer to the processor context when
the interrupt occurred on the processor.
@return None
**/
VOID
EFIAPI
GicV2IrqInterruptHandler (
IN EFI_EXCEPTION_TYPE InterruptType,
IN EFI_SYSTEM_CONTEXT SystemContext
)
{
UINT32 GicInterrupt;
HARDWARE_INTERRUPT_HANDLER InterruptHandler;
GicInterrupt = ArmGicV2AcknowledgeInterrupt (mGicInterruptInterfaceBase);
// Special Interrupts (ID1020-ID1023) have an Interrupt ID greater than the number of interrupt (ie: Spurious interrupt).
if ((GicInterrupt & ARM_GIC_ICCIAR_ACKINTID) >= mGicNumInterrupts) {
// The special interrupt do not need to be acknowledge
return;
}
InterruptHandler = gRegisteredInterruptHandlers[GicInterrupt];
if (InterruptHandler != NULL) {
// Call the registered interrupt handler.
InterruptHandler (GicInterrupt, SystemContext);
} else {
DEBUG ((EFI_D_ERROR, "Spurious GIC interrupt: 0x%x\n", GicInterrupt));
}
GicV2EndOfInterrupt (&gHardwareInterruptV2Protocol, GicInterrupt);
}
/**
Shutdown our hardware
DXE Core will disable interrupts and turn off the timer and disable interrupts
after all the event handlers have run.
@param[in] Event The Event that is being processed
@param[in] Context Event Context
**/
VOID
EFIAPI
GicV2ExitBootServicesEvent (
IN EFI_EVENT Event,
IN VOID *Context
)
{
UINTN Index;
UINT32 GicInterrupt;
// Disable all the interrupts
for (Index = 0; Index < mGicNumInterrupts; Index++) {
GicV2DisableInterruptSource (&gHardwareInterruptV2Protocol, Index);
}
// Acknowledge all pending interrupts
do {
GicInterrupt = ArmGicV2AcknowledgeInterrupt (mGicInterruptInterfaceBase);
if ((GicInterrupt & ARM_GIC_ICCIAR_ACKINTID) < mGicNumInterrupts) {
GicV2EndOfInterrupt (&gHardwareInterruptV2Protocol, GicInterrupt);
}
} while (!ARM_GIC_IS_SPECIAL_INTERRUPTS (GicInterrupt));
// Disable Gic Interface
ArmGicV2DisableInterruptInterface (mGicInterruptInterfaceBase);
// Disable Gic Distributor
ArmGicDisableDistributor (mGicDistributorBase);
}
/*
* Acknowledge and return the value of the Interrupt Acknowledge Register
*
* InterruptId is returned separately from the register value because in
* the GICv2 the register value contains the CpuId and InterruptId while
* in the GICv3 the register value is only the InterruptId.
*
* @param GicInterruptInterfaceBase Base Address of the GIC CPU Interface
* @param InterruptId InterruptId read from the Interrupt Acknowledge Register
*
* @retval value returned by the Interrupt Acknowledge Register
*
*/
UINTN
EFIAPI
ArmGicAcknowledgeInterrupt (
IN UINTN GicInterruptInterfaceBase,
OUT UINTN *InterruptId
)
{
UINTN Value;
Value = ArmGicV2AcknowledgeInterrupt (GicInterruptInterfaceBase);
// InterruptId is required for the caller to know if a valid or spurious
// interrupt has been read
ASSERT (InterruptId != NULL);
if (InterruptId != NULL) {
*InterruptId = Value & ARM_GIC_ICCIAR_ACKINTID;
}
return Value;
}
