ACPI!GetPciAddress到ACPI!GetPciAddressWorker完成后会调用state->CompletionRoutine：ACPI!PciConfigSpaceHandler
1: kd> kc
#
00 ACPI!GetPciAddress
01 ACPI!PciConfigSpaceHandlerWorker
02 ACPI!PciConfigSpaceHandler
03 ACPI!InternalOpRegionHandler
04 ACPI!WriteCookAccess
05 ACPI!RunContext
06 ACPI!InsertReadyQueue
07 ACPI!RestartCtxtPassive
08 ACPI!ACPIWorker
09 nt!PspSystemThreadStartup
0a nt!KiThreadStartup
1: kd> dv
PciObj = 0x899affac
CompletionRoutine = 0xf740d62c
Context = 0x89987378
Bus = 0x899873b0 ""
Slot = 0x899873ac
1: kd> t
eax=899affac ebx=89987378 ecx=899873ac edx=899bf408 esi=f740d62c edi=899bf434
eip=f740ceea esp=f791abe8 ebp=f791ac04 iopl=0 nv up ei ng nz na pe nc
cs=0008 ss=0010 ds=0023 es=0023 fs=0030 gs=0000 efl=00000286
ACPI!GetPciAddressWorker:
f740ceea 55 push ebp
1: kd> kc
#
00 ACPI!GetPciAddressWorker
01 ACPI!GetPciAddress
02 ACPI!PciConfigSpaceHandlerWorker
03 ACPI!PciConfigSpaceHandler
04 ACPI!InternalOpRegionHandler
05 ACPI!WriteCookAccess
06 ACPI!RunContext
07 ACPI!InsertReadyQueue
08 ACPI!RestartCtxtPassive
09 ACPI!ACPIWorker
0a nt!PspSystemThreadStartup
0b nt!KiThreadStartup
1: kd> dv
AcpiObject = 0x899affac
Status = 0n0
Result = 0x00000000
Context = 0x899bf408
buffer = unsigned char [64] ""
1: kd> dt GET_ADDRESS_CONTEXT 0x899bf408
ACPI!GET_ADDRESS_CONTEXT
+0x000 PciObject : 0x899affac _NSObj
+0x004 Bus : 0x899873b0 ""
+0x008 Slot : 0x899873ac _PCI_SLOT_NUMBER
+0x00c ParentBus : 0 ''
+0x010 ParentSlot : _PCI_SLOT_NUMBER
+0x014 Flags : 0
+0x018 Address : 0
+0x01c BaseBusNumber : 0
+0x020 RunCompletion : 0n-1
+0x024 CompletionRoutine : 0xf740d62c void ACPI!PciConfigSpaceHandlerWorker+0
+0x028 CompletionContext : 0x89987378 Void
1: kd> u f740d62c
ACPI!PciConfigSpaceHandlerWorker [d:\srv03rtm\base\busdrv\acpi\driver\nt\pciopregion.c @ 544]:
f740d62c 55 push ebp
f740d62d 8bec mov ebp,esp
f740d62f 83ec44 sub esp,44h
f740d632 a1a88c43f7 mov eax,dword ptr [ACPI!__security_cookie (f7438ca8)]
f740d637 53 push ebx
f740d638 8b5d14 mov ebx,dword ptr [ebp+14h]
f740d63b 56 push esi
f740d63c 57 push edi
windbg> .open -a fffffffff740d62c
1: kd> dt PCI_CONFIG_STATE 0x89987378
ACPI!PCI_CONFIG_STATE
+0x000 AccessType : 1
+0x004 OpRegion : 0x899b0b50 _NSObj
+0x008 Address : 0xd8
+0x00c Size : 4
+0x010 Data : 0x8997dc28 -> 0x40e98102
+0x014 Context : 0
+0x018 CompletionHandler : 0xf7420914 Void
+0x01c CompletionContext : 0x8997c0ac Void
+0x020 PciObj : 0x899affac _NSObj
+0x024 ParentObj : (null)
+0x028 CompletionHandlerType : 0
+0x02c Flags : 0x100
+0x030 RunCompletion : 0n0
+0x034 Slot : _PCI_SLOT_NUMBER
+0x038 Bus : 0 ''
+0x039 IsPciDeviceResult : 0 ''
+0x024 CompletionRoutine : 0xf740d62c void ACPI!PciConfigSpaceHandlerWorker+0
完成例程会再次进入函数ACPI!PciConfigSpaceHandlerWorker，
再次进入函数ACPI!PciConfigSpaceHandlerWorker，下面的不会运行，
会继续向下运行，因为已经得到了state->Bus和state->Slot。
if (!interface) {
if (!(state->Flags & PCISUPP_GOT_SLOT_INFO)) {
state->Flags |= PCISUPP_GOT_SLOT_INFO;
status = GetPciAddress(state->PciObj,
PciConfigSpaceHandlerWorker,
(PVOID)state,
&state->Bus,
&state->Slot);
