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ACPI!ACPIBuildDeviceExtension函数分析之建立了第一个子设备扩展

news 2026/3/27 5:14:18

ACPI!ACPIBuildDeviceExtension函数分析之建立了第一个子设备扩展

0: kd> dv
CurrentObject = 0x899affac
ParentDeviceExtension = 0x89981a18
ReturnExtension = 0xf789a0d4
0: kd> dx -id 0,0,899a2278 -r1 ((ACPI!_NSObj *)0x899affac)
((ACPI!_NSObj *)0x899affac) : 0x899affac [Type: _NSObj *]
[+0x000] list [Type: _List]
[+0x008] pnsParent : 0x899af0f0 [Type: _NSObj *]
[+0x00c] pnsFirstChild : 0x0 [Type: _NSObj *]
[+0x010] dwNameSeg : 0x30494350 [Type: unsigned long]
[+0x014] hOwner : 0x899af330 [Type: void *]
[+0x018] pnsOwnedNext : 0x899aff4c [Type: _NSObj *]
[+0x01c] ObjData [Type: _ObjData]
[+0x030] Context : 0x0 [Type: void *]
[+0x034] dwRefCount : 0x0 [Type: unsigned long]

//
// Create a new extension for the object
//
deviceExtension = ExAllocateFromNPagedLookasideList( esi=899c0d58
&DeviceExtensionLookAsideList
);

0: kd> p
eax=899c0d58 ebx=89981a18 ecx=89bfe0e0 edx=00000000 esi=899c0d58 edi=899affac
eip=f73fc8e3 esp=f789a0a8 ebp=f789a0b4 iopl=0 nv up ei pl zr na pe nc
cs=0008 ss=0010 ds=0023 es=0023 fs=0030 gs=0000 efl=00000246
ACPI!ACPIBuildDeviceExtension+0x7b:
f73fc8e3 85f6 test esi,esi
//
// Lets begin with a clean slate
//
RtlZeroMemory( deviceExtension, sizeof(DEVICE_EXTENSION) );

//
// Initialize the reference count mechanism. We only have a NS object
// so the value should be 1
//
deviceExtension->ReferenceCount++ ;

//
// The initial outstanding IRP count will be set to one. Only during a
// remove IRP will this drop to zero, and then it will immediately pop
// back up to one.
//
deviceExtension->OutstandingIrpCount++;

//
// Initialize the link fields
//
deviceExtension->AcpiObject = CurrentObject; 关键代码1：

//
// Initialize the data fields
//
deviceExtension->Signature = ACPI_SIGNATURE;
deviceExtension->Flags = DEV_TYPE_NOT_FOUND | DEV_TYPE_NOT_PRESENT;
deviceExtension->DispatchTable = NULL;
deviceExtension->DeviceState = Stopped;
*ReturnExtension = deviceExtension;


0: kd> dt acpi!_DEVICE_EXTENSION 899c0d58
+0x000 Flags : 0xa
+0x000 UFlags : __unnamed
+0x008 Signature : 0x5f534750
+0x00c DebugFlags : 0
+0x010 DispatchTable : (null)
+0x014 WorkContext : WORK_QUEUE_CONTEXT
+0x014 Fdo : _FDO_DEVICE_EXTENSION
+0x014 Filter : _FILTER_DEVICE_EXTENSION
+0x014 Pdo : _PDO_DEVICE_EXTENSION
+0x058 WorkQueue : EXTENSION_WORKER
+0x058 Button : BUTTON_EXTENSION
+0x058 Thermal : THERMAL_EXTENSION
+0x058 LinkNode : LINK_NODE_EXTENSION
+0x058 Dock : DOCK_EXTENSION
+0x058 Processor : _PROCESSOR_DEVICE_EXTENSION
+0x088 DeviceState : 0 ( Stopped )
+0x08c PreviousState : 0 ( Stopped )
+0x090 PowerInfo : _ACPI_POWER_INFO
+0x10c DeviceID : (null)
+0x10c Address : 0
+0x110 InstanceID : (null)
+0x114 ResourceList : (null)
+0x118 PnpResourceList : (null)
+0x11c OutstandingIrpCount : 0n1
+0x120 ReferenceCount : 0n1
+0x124 HibernatePathCount : 0n0
+0x128 RemoveEvent : (null)
+0x12c AcpiObject : 0x899affac _NSObj
+0x130 DeviceObject : (null)
+0x134 TargetDeviceObject : (null)
+0x138 PhysicalDeviceObject : (null)
+0x13c ParentExtension : (null)
+0x140 ChildDeviceList : _LIST_ENTRY [ 0x0 - 0x0 ]
+0x148 SiblingDeviceList : _LIST_ENTRY [ 0x0 - 0x0 ]
+0x150 EjectDeviceHead : _LIST_ENTRY [ 0x0 - 0x0 ]
+0x158 EjectDeviceList : _LIST_ENTRY [ 0x0 - 0x0 ]


//
// Initialize the list entries
//
InitializeListHead( &(deviceExtension->ChildDeviceList) );
InitializeListHead( &(deviceExtension->EjectDeviceHead) );
InitializeListHead( &(deviceExtension->EjectDeviceList) );
InitializeListHead( &(powerInfo->WakeSupportList) );
InitializeListHead( &(powerInfo->PowerRequestListEntry) );

//
// Make sure that the deviceExtension has pointers to its parent
// extension. Note, that this should cause the ref count on the
// parent to increase
//
deviceExtension->ParentExtension = ParentDeviceExtension; 关键代码2：


0: kd> dt acpi!_DEVICE_EXTENSION 899c0d58
+0x000 Flags : 0xa
+0x000 UFlags : __unnamed
+0x008 Signature : 0x5f534750
+0x00c DebugFlags : 0
+0x010 DispatchTable : (null)
+0x014 WorkContext : WORK_QUEUE_CONTEXT
+0x014 Fdo : _FDO_DEVICE_EXTENSION
+0x014 Filter : _FILTER_DEVICE_EXTENSION
+0x014 Pdo : _PDO_DEVICE_EXTENSION
+0x058 WorkQueue : EXTENSION_WORKER
+0x058 Button : BUTTON_EXTENSION
+0x058 Thermal : THERMAL_EXTENSION
+0x058 LinkNode : LINK_NODE_EXTENSION
+0x058 Dock : DOCK_EXTENSION
+0x058 Processor : _PROCESSOR_DEVICE_EXTENSION
+0x088 DeviceState : 0 ( Stopped )
+0x08c PreviousState : 0 ( Stopped )
+0x090 PowerInfo : _ACPI_POWER_INFO
+0x10c DeviceID : (null)
+0x10c Address : 0
+0x110 InstanceID : (null)
+0x114 ResourceList : (null)
+0x118 PnpResourceList : (null)
+0x11c OutstandingIrpCount : 0n1
+0x120 ReferenceCount : 0n1
+0x124 HibernatePathCount : 0n0
+0x128 RemoveEvent : (null)
+0x12c AcpiObject : 0x899affac _NSObj
+0x130 DeviceObject : (null)
+0x134 TargetDeviceObject : (null)
+0x138 PhysicalDeviceObject : (null)
+0x13c ParentExtension : 0x89981a18 _DEVICE_EXTENSION
+0x140 ChildDeviceList : _LIST_ENTRY [ 0x899c0e98 - 0x899c0e98 ]
+0x148 SiblingDeviceList : _LIST_ENTRY [ 0x89981b58 - 0x89981b58 ]
+0x150 EjectDeviceHead : _LIST_ENTRY [ 0x899c0ea8 - 0x899c0ea8 ]
+0x158 EjectDeviceList : _LIST_ENTRY [ 0x899c0eb0 - 0x899c0eb0 ]

if (ParentDeviceExtension) {

InterlockedIncrement( &(ParentDeviceExtension->ReferenceCount) );

//
// Add the deviceExtension into the deviceExtension tree
//
InsertTailList(
&(ParentDeviceExtension->ChildDeviceList),
&(deviceExtension->SiblingDeviceList)
); 关键代码3：
}


0: kd> dt ACPI!_DEVICE_EXTENSION 0x89981a18
+0x000 Flags : 0x0001e000`00200010
+0x000 UFlags : __unnamed
+0x008 Signature : 0x5f534750
+0x00c DebugFlags : 0
+0x010 DispatchTable : 0xf743826c IRP_DISPATCH_TABLE
+0x014 WorkContext : WORK_QUEUE_CONTEXT
+0x014 Fdo : _FDO_DEVICE_EXTENSION
+0x014 Filter : _FILTER_DEVICE_EXTENSION
+0x014 Pdo : _PDO_DEVICE_EXTENSION
+0x058 WorkQueue : EXTENSION_WORKER
+0x058 Button : BUTTON_EXTENSION
+0x058 Thermal : THERMAL_EXTENSION
+0x058 LinkNode : LINK_NODE_EXTENSION
+0x058 Dock : DOCK_EXTENSION
+0x058 Processor : _PROCESSOR_DEVICE_EXTENSION
+0x088 DeviceState : 0 ( Stopped )
+0x08c PreviousState : 0 ( Stopped )
+0x090 PowerInfo : _ACPI_POWER_INFO
+0x10c DeviceID : 0x899bfea0 "ACPI\PNP0C08"
+0x10c Address : 0x899bfea0
+0x110 InstanceID : 0x899c53e8 "0x5F534750"
+0x114 ResourceList : 0x899bfeb8 _CM_RESOURCE_LIST
+0x118 PnpResourceList : (null)
+0x11c OutstandingIrpCount : 0n2
+0x120 ReferenceCount : 0n3
+0x124 HibernatePathCount : 0n0
+0x128 RemoveEvent : (null)
+0x12c AcpiObject : (null)
+0x130 DeviceObject : 0x89981b98 _DEVICE_OBJECT
+0x134 TargetDeviceObject : 0x899c1de0 _DEVICE_OBJECT
+0x138 PhysicalDeviceObject : 0x899c1de0 _DEVICE_OBJECT
+0x13c ParentExtension : (null)
+0x140 ChildDeviceList : _LIST_ENTRY [ 0x899c0ea0 - 0x899c0ea0 ]
+0x148 SiblingDeviceList : _LIST_ENTRY [ 0x89981b60 - 0x89981b60 ]
+0x150 EjectDeviceHead : _LIST_ENTRY [ 0x89981b68 - 0x89981b68 ]
+0x158 EjectDeviceList : _LIST_ENTRY [ 0x89981b70 - 0x89981b70 ]
0: kd> dx -id 0,0,899a2278 -r1 (*((ACPI!_LIST_ENTRY *)0x89981b58))
(*((ACPI!_LIST_ENTRY *)0x89981b58)) [Type: _LIST_ENTRY]
[+0x000] Flink : 0x899c0ea0 [Type: _LIST_ENTRY *]
[+0x004] Blink : 0x899c0ea0 [Type: _LIST_ENTRY *]


//
// And make sure that the Name Space Object points to the extension
//
if (CurrentObject != NULL ) {

CurrentObject->Context = deviceExtension; 关键代码4：
}


0: kd> dx -id 0,0,899a2278 -r1 ((ACPI!_NSObj *)0x899affac)
((ACPI!_NSObj *)0x899affac) : 0x899affac [Type: _NSObj *]
[+0x000] list [Type: _List]
[+0x008] pnsParent : 0x899af0f0 [Type: _NSObj *]
[+0x00c] pnsFirstChild : 0x0 [Type: _NSObj *]
[+0x010] dwNameSeg : 0x30494350 [Type: unsigned long]
[+0x014] hOwner : 0x899af330 [Type: void *]
[+0x018] pnsOwnedNext : 0x899aff4c [Type: _NSObj *]
[+0x01c] ObjData [Type: _ObjData]
[+0x030] Context : 0x899c0d58 [Type: void *] [+0x030] Context : 0x899c0d58
[+0x034] dwRefCount : 0x0 [Type: unsigned long]


0: kd> kc
#
00 ACPI!ACPIBuildDeviceExtension
01 ACPI!OSNotifyCreateDevice
02 ACPI!OSNotifyCreate
03 ACPI!Device
04 ACPI!ParseTerm
05 ACPI!RunContext
06 ACPI!InsertReadyQueue
07 ACPI!RestartContext
08 ACPI!SyncLoadDDB
09 ACPI!AMLILoadDDB
0a ACPI!ACPIInitializeDDB
0b ACPI!ACPIInitializeDDBs
0c ACPI!ACPIInitialize
0d ACPI!ACPIInitStartACPI
0e ACPI!ACPIRootIrpStartDevice
0f ACPI!ACPIDispatchIrp
10 nt!IofCallDriver
11 nt!IopSynchronousCall
12 nt!IopStartDevice
13 nt!PipProcessStartPhase1
14 nt!PipProcessDevNodeTree
15 nt!PipDeviceActionWorker
16 nt!PipRequestDeviceAction
17 nt!IopInitializeBootDrivers
18 nt!IoInitSystem
19 nt!Phase1Initialization
1a nt!PspSystemThreadStartup
1b nt!KiThreadStartup

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