UINT32
AcpiEvFixedEventDetect (
void)
{
UINT32 IntStatus = ACPI_INTERRUPT_NOT_HANDLED;
UINT32 FixedStatus;
UINT32 FixedEnable;
UINT32 i;
ACPI_STATUS Status;
ACPI_FUNCTION_NAME (EvFixedEventDetect);
/*
* Read the fixed feature status and enable registers, as all the cases
* depend on their values. Ignore errors here.
*/
Status = AcpiHwRegisterRead (ACPI_REGISTER_PM1_STATUS, &FixedStatus);
Status |= AcpiHwRegisterRead (ACPI_REGISTER_PM1_ENABLE, &FixedEnable);
if (ACPI_FAILURE (Status))
{
return (IntStatus);
}
ACPI_DEBUG_PRINT ((ACPI_DB_INTERRUPTS,
"Fixed Event Block: Enable %08X Status %08X\n",
FixedEnable, FixedStatus));
/*
* Check for all possible Fixed Events and dispatch those that are active
*/
for (i = 0; i < ACPI_NUM_FIXED_EVENTS; i++)
{
/* Both the status and enable bits must be on for this event */
if ((FixedStatus & AcpiGbl_FixedEventInfo[i].StatusBitMask) &&
(FixedEnable & AcpiGbl_FixedEventInfo[i].EnableBitMask))
{
/*
* Found an active (signalled) event. Invoke global event
* handler if present.
*/
AcpiFixedEventCount[i]++;
if (AcpiGbl_GlobalEventHandler)
{
AcpiGbl_GlobalEventHandler (ACPI_EVENT_TYPE_FIXED, NULL,
i, AcpiGbl_GlobalEventHandlerContext);
}
IntStatus |= AcpiEvFixedEventDispatch (i);
}
}
return (IntStatus);
}
UINT32
AcpiEvGpeDetect (
ACPI_GPE_XRUPT_INFO *GpeXruptList)
{
ACPI_STATUS Status;
ACPI_GPE_BLOCK_INFO *GpeBlock;
ACPI_NAMESPACE_NODE *GpeDevice;
ACPI_GPE_REGISTER_INFO *GpeRegisterInfo;
ACPI_GPE_EVENT_INFO *GpeEventInfo;
UINT32 GpeNumber;
ACPI_GPE_HANDLER_INFO *GpeHandlerInfo;
UINT32 IntStatus = ACPI_INTERRUPT_NOT_HANDLED;
UINT8 EnabledStatusByte;
UINT32 StatusReg;
UINT32 EnableReg;
ACPI_CPU_FLAGS Flags;
UINT32 i;
UINT32 j;
ACPI_FUNCTION_NAME (EvGpeDetect);
/* Check for the case where there are no GPEs */
if (!GpeXruptList)
{
return (IntStatus);
}
/*
* We need to obtain the GPE lock for both the data structs and registers
* Note: Not necessary to obtain the hardware lock, since the GPE
* registers are owned by the GpeLock.
*/
Flags = AcpiOsAcquireLock (AcpiGbl_GpeLock);
/* Examine all GPE blocks attached to this interrupt level */
GpeBlock = GpeXruptList->GpeBlockListHead;
while (GpeBlock)
{
GpeDevice = GpeBlock->Node;
/*
* Read all of the 8-bit GPE status and enable registers in this GPE
* block, saving all of them. Find all currently active GP events.
*/
for (i = 0; i < GpeBlock->RegisterCount; i++)
{
/* Get the next status/enable pair */
GpeRegisterInfo = &GpeBlock->RegisterInfo[i];
/*
* Optimization: If there are no GPEs enabled within this
* register, we can safely ignore the entire register.
*/
if (!(GpeRegisterInfo->EnableForRun |
GpeRegisterInfo->EnableForWake))
{
ACPI_DEBUG_PRINT ((ACPI_DB_INTERRUPTS,
"Ignore disabled registers for GPE %02X-%02X: "
"RunEnable=%02X, WakeEnable=%02X\n",
GpeRegisterInfo->BaseGpeNumber,
GpeRegisterInfo->BaseGpeNumber + (ACPI_GPE_REGISTER_WIDTH - 1),
GpeRegisterInfo->EnableForRun,
GpeRegisterInfo->EnableForWake));
continue;
}
/* Read the Status Register */
Status = AcpiHwRead (&StatusReg, &GpeRegisterInfo->StatusAddress);
if (ACPI_FAILURE (Status))
{
goto UnlockAndExit;
}
/* Read the Enable Register */
Status = AcpiHwRead (&EnableReg, &GpeRegisterInfo->EnableAddress);
if (ACPI_FAILURE (Status))
{
goto UnlockAndExit;
}
ACPI_DEBUG_PRINT ((ACPI_DB_INTERRUPTS,
"Read registers for GPE %02X-%02X: Status=%02X, Enable=%02X, "
"RunEnable=%02X, WakeEnable=%02X\n",
GpeRegisterInfo->BaseGpeNumber,
GpeRegisterInfo->BaseGpeNumber + (ACPI_GPE_REGISTER_WIDTH - 1),
StatusReg, EnableReg,
GpeRegisterInfo->EnableForRun,
GpeRegisterInfo->EnableForWake));
/* Check if there is anything active at all in this register */
EnabledStatusByte = (UINT8) (StatusReg & EnableReg);
if (!EnabledStatusByte)
{
/* No active GPEs in this register, move on */
continue;
}
/* Now look at the individual GPEs in this byte register */
for (j = 0; j < ACPI_GPE_REGISTER_WIDTH; j++)
{
/* Examine one GPE bit */
GpeEventInfo = &GpeBlock->EventInfo[((ACPI_SIZE) i *
ACPI_GPE_REGISTER_WIDTH) + j];
GpeNumber = j + GpeRegisterInfo->BaseGpeNumber;
if (EnabledStatusByte & (1 << j))
{
/* Invoke global event handler if present */
AcpiGpeCount++;
if (AcpiGbl_GlobalEventHandler)
{
AcpiGbl_GlobalEventHandler (ACPI_EVENT_TYPE_GPE,
GpeDevice, GpeNumber,
AcpiGbl_GlobalEventHandlerContext);
}
/* Found an active GPE */
if (ACPI_GPE_DISPATCH_TYPE (GpeEventInfo->Flags) ==
ACPI_GPE_DISPATCH_RAW_HANDLER)
{
/* Dispatch the event to a raw handler */
GpeHandlerInfo = GpeEventInfo->Dispatch.Handler;
/*
* There is no protection around the namespace node
* and the GPE handler to ensure a safe destruction
* because:
* 1. The namespace node is expected to always
* exist after loading a table.
* 2. The GPE handler is expected to be flushed by
* AcpiOsWaitEventsComplete() before the
* destruction.
*/
AcpiOsReleaseLock (AcpiGbl_GpeLock, Flags);
IntStatus |= GpeHandlerInfo->Address (
GpeDevice, GpeNumber, GpeHandlerInfo->Context);
Flags = AcpiOsAcquireLock (AcpiGbl_GpeLock);
}
else
{
/*
* Dispatch the event to a standard handler or
* method.
*/
IntStatus |= AcpiEvGpeDispatch (GpeDevice,
GpeEventInfo, GpeNumber);
}
}
}
}
GpeBlock = GpeBlock->Next;
}
UnlockAndExit:
AcpiOsReleaseLock (AcpiGbl_GpeLock, Flags);
return (IntStatus);
}
UINT32
AcpiEvGpeDispatch (
ACPI_NAMESPACE_NODE *GpeDevice,
ACPI_GPE_EVENT_INFO *GpeEventInfo,
UINT32 GpeNumber)
{
ACPI_STATUS Status;
UINT32 ReturnValue;
ACPI_FUNCTION_TRACE (EvGpeDispatch);
/* Invoke global event handler if present */
AcpiGpeCount++;
if (AcpiGbl_GlobalEventHandler)
{
AcpiGbl_GlobalEventHandler (ACPI_EVENT_TYPE_GPE, GpeDevice,
GpeNumber, AcpiGbl_GlobalEventHandlerContext);
}
/*
* If edge-triggered, clear the GPE status bit now. Note that
* level-triggered events are cleared after the GPE is serviced.
*/
if ((GpeEventInfo->Flags & ACPI_GPE_XRUPT_TYPE_MASK) ==
ACPI_GPE_EDGE_TRIGGERED)
{
Status = AcpiHwClearGpe (GpeEventInfo);
if (ACPI_FAILURE (Status))
{
ACPI_EXCEPTION ((AE_INFO, Status,
"Unable to clear GPE %02X", GpeNumber));
return_UINT32 (ACPI_INTERRUPT_NOT_HANDLED);
}
}
/*
* Always disable the GPE so that it does not keep firing before
* any asynchronous activity completes (either from the execution
* of a GPE method or an asynchronous GPE handler.)
*
* If there is no handler or method to run, just disable the
* GPE and leave it disabled permanently to prevent further such
* pointless events from firing.
*/
Status = AcpiHwLowSetGpe (GpeEventInfo, ACPI_GPE_DISABLE);
if (ACPI_FAILURE (Status))
{
ACPI_EXCEPTION ((AE_INFO, Status,
"Unable to disable GPE %02X", GpeNumber));
return_UINT32 (ACPI_INTERRUPT_NOT_HANDLED);
}
/*
* Dispatch the GPE to either an installed handler or the control
* method associated with this GPE (_Lxx or _Exx). If a handler
* exists, we invoke it and do not attempt to run the method.
* If there is neither a handler nor a method, leave the GPE
* disabled.
*/
switch (GpeEventInfo->Flags & ACPI_GPE_DISPATCH_MASK)
{
case ACPI_GPE_DISPATCH_HANDLER:
/* Invoke the installed handler (at interrupt level) */
ReturnValue = GpeEventInfo->Dispatch.Handler->Address (
GpeDevice, GpeNumber,
GpeEventInfo->Dispatch.Handler->Context);
/* If requested, clear (if level-triggered) and reenable the GPE */
if (ReturnValue & ACPI_REENABLE_GPE)
{
(void) AcpiEvFinishGpe (GpeEventInfo);
}
break;
case ACPI_GPE_DISPATCH_METHOD:
case ACPI_GPE_DISPATCH_NOTIFY:
/*
* Execute the method associated with the GPE
* NOTE: Level-triggered GPEs are cleared after the method completes.
*/
Status = AcpiOsExecute (OSL_GPE_HANDLER,
AcpiEvAsynchExecuteGpeMethod, GpeEventInfo);
if (ACPI_FAILURE (Status))
{
ACPI_EXCEPTION ((AE_INFO, Status,
"Unable to queue handler for GPE %02X - event disabled",
GpeNumber));
}
break;
default:
/*
* No handler or method to run!
* 03/2010: This case should no longer be possible. We will not allow
* a GPE to be enabled if it has no handler or method.
*/
ACPI_ERROR ((AE_INFO,
"No handler or method for GPE %02X, disabling event",
GpeNumber));
break;
}
return_UINT32 (ACPI_INTERRUPT_HANDLED);
}
