在引导系统后，会有一些驱动程序是由引导参数指定的，下面这个函数，就是处理引导时加载到内存里的驱动程序，实现的代码如下：
#001 VOID
#002 FASTCALL
#003 IopInitializeBootDrivers(VOID)
#004 {
#005 PLIST_ENTRY ListHead, NextEntry;
#006 PLDR_DATA_TABLE_ENTRY LdrEntry;
#007 PDEVICE_NODE DeviceNode;
#008 PDRIVER_OBJECT DriverObject;
#009 LDR_DATA_TABLE_ENTRY ModuleObject;
#010 NTSTATUS Status;
#011
UNICODE_STRING DriverName;
#012
#013
DPRINT("IopInitializeBootDrivers()/n");
#014
为根设备节点IopRootDeviceNode创建一个设备节点。
#015 /* Use IopRootDeviceNode for now */
#016 Status =
IopCreateDeviceNode(IopRootDeviceNode, NULL, NULL, &DeviceNode);
#017 if (!NT_SUCCESS(Status)) return;
#018
设置最基本的文件系统驱动程序。
#019 /* Setup the module object for the RAW FS
Driver */
#020 ModuleObject.DllBase = NULL;
#021 ModuleObject.SizeOfImage = 0;
#022 ModuleObject.EntryPoint =
RawFsDriverEntry;
#023 RtlInitUnicodeString(&DriverName,
L"RAW");
#024
初始化这个驱动程序模块。
#025 /* Initialize it */
#026 Status =
IopInitializeDriverModule(DeviceNode,
#027
&ModuleObject,
#028
&DriverName,
#029 TRUE,
#030 &DriverObject);
#031 if (!NT_SUCCESS(Status))
#032 {
#033 /* Fail */
#034 IopFreeDeviceNode(DeviceNode);
#035 return;
#036 }
#037
关联设备驱动程序到设备节点。
#038 /* Now initialize the associated device
*/
#039 Status = IopInitializeDevice(DeviceNode,
DriverObject);
#040 if (!NT_SUCCESS(Status))
#041 {
#042 /* Fail */
#043 IopFreeDeviceNode(DeviceNode);
#044
return;
#045 }
#046
开始启动这个设备，通过IRP包来通知系统，然后分配设备所需要的资源。
#047 /* Start it up */
#048 Status = IopStartDevice(DeviceNode);
#049 if (!NT_SUCCESS(Status))
#050 {
#051 /* Fail */
#052 IopFreeDeviceNode(DeviceNode);
#053 return;
#054 }
#055
循环地加载引导时指定的驱动程序。
#056 /* Loop the boot modules */
#057 ListHead =
&KeLoaderBlock->LoadOrderListHead;
#058 NextEntry = ListHead->Flink;
#059 while (ListHead != NextEntry)
#060 {
#061 /* Get the entry */
#062 LdrEntry =
CONTAINING_RECORD(NextEntry,
#063
LDR_DATA_TABLE_ENTRY,
#064
InLoadOrderLinks);
#065
#066 /*
#067 * HACK: Make sure we're loading a
driver
#068 * (we should be using
BootDriverListHead!)
#069 */
#070 if
(wcsstr(_wcsupr(LdrEntry->BaseDllName.Buffer), L".SYS"))
#071 {
#072 /* Make sure we didn't load this
driver already */
#073 if (!(LdrEntry->Flags &
LDRP_ENTRY_INSERTED))
#074 {
循环地加载已经在内存里驱动程序，并且启动这些设备。
#075 DPRINT("Initializing
bootdriver %wZ/n", &LdrEntry->BaseDllName);
#076 /* Initialize it */
#077
IopInitializeBuiltinDriver(LdrEntry);
#078 }
#079 }
#080
#081 /* Go to the next driver */
#082 NextEntry = NextEntry->Flink;
#083 }
#084
#085 /* In old ROS, the loader list became empty
after this point. Simulate. */
#086
InitializeListHead(&KeLoaderBlock->LoadOrderListHead);
#087 }