DpcDxe

Function Table

Address	Name	Description
	DpcInternalIsListValid
	DpcInternalIsListEmpty
	DpcGetDebugOutputProtocol
	DpcDebugAssert
	DpcReportAssertError
	DpcReadUnaligned64
	DpcCompareGuid
	DpcHobInit
	DpcQueueDpc
	DpcDispatchDpc
	DpcDriverEntry
	ModuleEntryPoint
Global	data
Protocol	interface instance	EFI_DPC_PROTOCOL
EFI_DPC_PROTOCOL	gDpcProtocolInterface;
Head	of the free DPC_ENTRY pool (at 0x1140)
LIST_ENTRY	gDpcFreeListHead;
DPC	queue heads	one LIST_ENTRY per priority level (0..31)
Array	*at 0x11C0 .. 0x13AF (32 entries 16 bytes each)**
LIST_ENTRY	gDpcQueue[DPC_NUM_QUEUES];
Statistics	(at 0x1160, 0x1170)
UINT64	gDpcQueueDepth = 0;
Protocol	registration handle (at 0x1168)
EFI_HANDLE	gDpcProtocolHandle = NULL;
Debug	output protocol (at 0x1198)
EFI_DEBUG_OUTPUT_PROTOCOL	*gDpcDebugProtocol = NULL;
HOB	list pointer (at 0x11A0)
VOID	*gDpcHobList = NULL;
Memory	management
Debug	output support
Read	CMOS status	check error reporting level.
Port	0x70 index, port 0x71 data.
CmosIndex	= __inbyte (0x70);
Map	CMOS value to EFI error severity.
if	(CmosValue == 1) {
0x80000004	} else {
0x80000006	}
GUID	comparison and HOB list initialization
Validate	DpcToken (must be in range 4..0x1F).
if	**((DpcToken < 4)		(DpcToken > 0x1F)) {**
Raise	TPL to serialize access to the DPC free list and queues.
Tpl	= gBS->RaiseTPL (TPL_DPC_PROCESSING);
Check	if the free list has an entry.
if	(DpcInternalIsListEmpty (&gDpcFreeListHead)) {
Free	list is empty	try to allocate more entries.
if	(Tpl <= 16) {
TPL	is high but still low enough for AllocatePool.
Loop	up to DPC_ALLOCATE_BATCH (64) times, dropping and
raising	TPL each iteration.
for	(RetryCount = 0; RetryCount < DPC_ALLOCATE_BATCH; RetryCount++) {
Restore	TPL so AllocatePool can work.
Allocate	a new DPC entry.
Entry	= DpcAllocatePool ();
Raise	TPL back.
Check	again if free list is still empty (another thread
may	have freed entries while TPL was lowered).
Free	list is still empty	add this entry to it.
DpcInternalInsertTailList	(&gDpcFreeListHead, &Entry->List);
After	the loop, check if we now have an entry.
TPL	is too high for pool allocation.
Status	= EFI_OUT_OF_RESOURCES;
Take	an entry from the free list.
Entry	= BASE_CR (gDpcFreeListHead.ForwardLink, DPC_ENTRY, List);
Populate	the DPC entry.
Queue	to the correct priority-level list.
DpcInternalInsertTailList	(&gDpcQueue[DpcToken], &Entry->List);
Update	statistics.
Raise	TPL to DPC_PROCESSING to serialize.
Process	priorities from the raised TPL (31) downwards.
if	(Priority <= 31) {
If	this priority queue has entries, drain it.
if	(!DpcInternalIsListEmpty (&gDpcQueue[Priority])) {
Take	the first entry from the queue.
Entry	= BASE_CR (gDpcQueue[Priority].ForwardLink
Decrement	the queue depth counter.
Drop	TPL to the priority level so the callback
can	execute at its intended TPL.
Execute	the deferred procedure.
Raise	TPL back, and return the entry to the free list.
Move	to the next lower priority level.
if	(Priority == 0) {
Driver	initialization
Check	if DPC protocol is already installed.
Status	= gBS->LocateProtocol (
Protocol	already registered	this is a bug in the calling driver.
DpcDebugAssert	(
Initialize	all 32 DPC queue heads.
for	(QueueIndex = 0; QueueIndex < DPC_NUM_QUEUES; QueueIndex++) {
Install	the DPC protocol.
Status	= gBS->InstallProtocolInterface (
Initialize	UEFI globals.
gImageHandle	= ImageHandle;
Initialize	HOB list for DXE phase services.
DpcHobInit	();
return	DpcDriverEntry (ImageHandle, SystemTable);

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