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WDM Quick Reference

WDM Quick Reference Rev C
© Perisoft 2001 www.perisoft.net

Red fields are reserved. Numeric values are hex.

 

DRIVER_OBJECT
  0 1 2 3 4 5 6 7 8 9 A B C D E F
0
  		Type
(4) 		Size DeviceObject Flags DriverStart
10
  		DriverSize DriverSection DriverExtension Name
len 		Name
maxlen
20
  		Name
(wide string ptr) 		HardwareDatabase FastIoDispatch DriverEntry
30
  		StartIo Unload IRP_MJ_CREATE IRP_MJ_NAMED_PIPE

40
 

IRP_MJ_CLOSE IRP_MJ_READ IRP_MJ_WRITE IRP_MJ_QUERY_
INFORMATION
50
  		IRP_MJ_SET_INFORMATION IRP_MJ_QUERY_EA IRP_MJ_SET_EA IRP_MJ_FLUSH_BUFFERS
60
  		IRP_MJ_QUERY_VOLUME_
VOLUME_INFORMATION		 IRP_MJ_SET_VOLUME_
INFORMATION		 IRP_MJ_DIRECTORY_
CONTROL		 IRP_MJ_FILE_SYSTEM_
CONTROL
70
  		IRP_MJ_DEVICE_CONTROL IRP_MJ_SCSI /
IRP_MJ_INTERNAL_DEVICE_
CONTROL		 IRP_MJ_SHUTDOWN IRP_MJ_LOCK_CONTROL

80
 

IRP_MJ_CLEANUP IRP_MJ_CREATE_MAILSLOT IRP_MJ_QUERY_SECURITY IRP_MJ_SET_SECURITY
90
  		IRP_MJ_POWER IRP_MJ_SYSTEM_CONTROL IRP_MJ_DEVICE_CHANGE IRP_MJ_QUERY_QUOTA
A0
  		IRP_MJ_SET_QUOTA IRP_MJ_PNP  

 

Flags

Mask

Name
1 DRVO_UNLOAD_INVOKED
2 DRVO_LEGACY_DRIVER
4 DRVO_BUILTIN_DRIVER
8 DRVO_REINIT_REGISTERED
10 DRVO_INITIALIZED
20 DRVO_BOOTREINIT_REGISTERED
40 DRVO_LEGACY_RESOURCES

 

DEVICE_OBJECT
  0 1 2 3 4 5 6 7 8 9 A B C D E F
0
  		Type
(3) 		Size Ref Count DriverObject NextDev
10
  		AttachedDev CurrentIrp Timer Flags
20
  		Characteristics VPB DeviceExtension DevType

30
 

Stk
Siz 		  Queue.ListEntry /
Queue.WaitContextBlock
40
  		...
50
  		... Alignment
(reverse mask)
60
  		DeviceQueue

70
 

... DPC
80
  		...
90
  		... ActiveThreads SecurityDesc DeviceLock
A0
  		... Sector
Size 		Spare1
B0
  		DevObjExtension Reserved  

 

Flags

Mask

Name
1 DO_UNLOAD_PENDING
2 DO_VERIFY_VOLUME
4 DO_BUFFERED_IO
8 DO_EXCLUSIVE
10 DO_DIRECT_IO
20 DO_MAP_IO_BUFFER
40 DO_DEVICE_HAS_NAME
80 DO_DEVICE_INITIALIZING
100 DO_SYSTEM_BOOT_PARTITION
200 DO_LONG_TERM_REQUESTS
400 DO_NEVER_LAST_DEVICE
800 DO_SHUTDOWN_REGISTERED
1000 DO_BUS_ENUMERATED_DEVICE
2000 DO_POWER_PAGABLE
4000 DO_POWER_INRUSH
10000 DO_LOW_PRIORITY_FILESYSTEM

 

Characteristics
Mask Name
0001 FILE_REMOVABLE_MEDIA
0002 FILE_READ_ONLY_DEVICE
0004 FILE_FLOPPY_DISKETTE
0008 FILE_WRITE_ONCE_MEDIA
0010 FILE_REMOTE_DEVICE
0020 FILE_DEVICE_IS_MOUNTED
0040 FILE_VIRTUAL_VOLUME
0080 FILE_AUTOGENERATED_DEVICE_NAME
0100 FILE_DEVICE_SECURE_OPEN

 

DevType
Value Name
1

FILE_DEVICE_BEEP
2

FILE_DEVICE_CD_ROM
3

FILE_DEVICE_CD_ROM_FILE_SYSTEM
4

FILE_DEVICE_CONTROLLER
5

FILE_DEVICE_DATALINK
6

FILE_DEVICE_DFS
7

FILE_DEVICE_DISK
8

FILE_DEVICE_DISK_FILE_SYSTEM
9

FILE_DEVICE_FILE_SYSTEM
a

FILE_DEVICE_INPORT_PORT
b

FILE_DEVICE_KEYBOARD
c

FILE_DEVICE_MAILSLOT
d

FILE_DEVICE_MIDI_IN
e

FILE_DEVICE_MIDI_OUT
f

FILE_DEVICE_MOUSE
10

FILE_DEVICE_MULTI_UNC_PROVIDER
11

FILE_DEVICE_NAMED_PIPE
12

FILE_DEVICE_NETWORK
13

FILE_DEVICE_NETWORK_BROWSER
14

FILE_DEVICE_NETWORK_FILE_SYSTEM
15

FILE_DEVICE_NULL
16

FILE_DEVICE_PARALLEL_PORT
17

FILE_DEVICE_PHYSICAL_NETCARD
18

FILE_DEVICE_PRINTER
19

FILE_DEVICE_SCANNER
1a

FILE_DEVICE_SERIAL_MOUSE_PORT
1b

FILE_DEVICE_SERIAL_PORT
FILE_DEVICE_SCSI
1c

FILE_DEVICE_SCREEN
1d

FILE_DEVICE_SOUND
1e

FILE_DEVICE_STREAMS
1f

FILE_DEVICE_TAPE
20

FILE_DEVICE_TAPE_FILE_SYSTEM
21

FILE_DEVICE_TRANSPORT
22

FILE_DEVICE_UNKNOWN
FILE_DEVICE_USB
23

FILE_DEVICE_VIDEO
24

FILE_DEVICE_VIRTUAL_DISK
25

FILE_DEVICE_WAVE_IN
26

FILE_DEVICE_WAVE_OUT
27

FILE_DEVICE_8042_PORT
28

FILE_DEVICE_NETWORK_REDIRECTOR
29

FILE_DEVICE_BATTERY
2a

FILE_DEVICE_BUS_EXTENDER
2b

FILE_DEVICE_MODEM
2c

FILE_DEVICE_VDM
2d

FILE_DEVICE_MASS_STORAGE
2e

FILE_DEVICE_SMB
2f

FILE_DEVICE_KS
30

FILE_DEVICE_CHANGER
31

FILE_DEVICE_SMARTCARD
32

FILE_DEVICE_ACPI
33

FILE_DEVICE_DVD
34

FILE_DEVICE_FULLSCREEN_VIDEO
35

FILE_DEVICE_DFS_FILE_SYSTEM
36

FILE_DEVICE_DFS_VOLUME
37

FILE_DEVICE_SERENUM
38

FILE_DEVICE_TERMSRV
39

FILE_DEVICE_KSEC
3A

FILE_DEVICE_FIPS
≥8000

vendor unique

 

IRP
  0 1 2 3 4 5 6 7 8 9 A B C D E F
0
  		Type
(6) 		Size Mdl Flags MasterIrp/IrpCount/
SystemBuffer
10
  		Thread.Flink Thread.Blink IoStatus.Status IoStatus.Information
20
  		Req
Mode		 Pnd
Ret		 Stak
Cnt		 Cur
Stak		 Can
cel		 Can
Irql		 Apc
Env		 Alloc
Flgs		 *UserIoStatus *UserEvent

30
 

UserApcProc/
AllocSize 		UserApcContext/
AllocSize 		CancelRoutine UserBuffer
40
  		Context[0] Context[1] Context[2] Context[3]
50
  		Thread AuxBuf List.Flink List.Blink
60
  		IO_STACK_LOC /
PacketType 		OriginalFileObject    

 

Flags
Mask Name
0001 IRP_NOCACHE
0002 IRP_PAGING_IO
IRP_MOUNT_COMPLETION
0004 IRP_SYNCHRONOUS_API
0008 IRP_ASSOCIATED_IRP
0010 IRP_BUFFERED_IO
0020 IRP_DEALLOCATE_BUFFER
0040 IRP_INPUT_OPERATION
IRP_SYNCHRONOUS_PAGING_IO
0080 IRP_CREATE_OPERATION
0100 IRP_READ_OPERATION
0200 IRP_WRITE_OPERATION
0400 IRP_CLOSE_OPERATION
0800 IRP_DEFER_IO_COMPLETION
1000 IRP_OB_QUERY_NAME
2000 IRP_HOLD_DEVICE_QUEUE
4000 IRP_RETRY_IO_COMPLETION
8000 IRP_CLASS_CACHE_OPERATION

 

IRQL
Value Name
0

PASSIVE_LEVEL
LOWER_LEVEL
1

APC_LEVEL
2

DISPATCH_LEVEL
7

HIGH_LEVEL
`b

PROFILE_LEVEL
1c

CLOCK1_LEVEL
CLOCK2_LEVEL
SYNCH_LEVEL
1d

IPI_LEVEL
1e

POWER_LEVEL
1f

HIGH_LEVEL

 

ReqMode
Value Name
1 KernelMode
2 UserMode
3 MaximumMode

 

IO_STACK_LOCATION
  0 1 2 3 4 5 6 7 8 9 A B C D E F
0
  		MJ MN Flg Ctl Arg1
(BufLenOut/...) 		Arg2
(BufLenIn/...) 		Arg3
(IOCTL/...)
10
  		Arg4
(Type3InputBuf/...) 		DeviceObject FileObject CompletionProc
20
  		Context      

 

Flags
Mask Name
01 SL_PENDING_RETURNED
20 SL_INVOKE_ON_CANCEL
40 SL_INVOKE_ON_SUCCESS
80 SL_INVOKE_ON_ERROR

 

Major/Minor Function
MJ [MN] Name
0 IRP_MJ_CREATE
1 IRP_MJ_NAMED_PIPE
2 IRP_MJ_CLOSE
3 IRP_MJ_READ
4 IRP_MJ_WRITE
5 IRP_MJ_QUERY_INFORMATION
6 IRP_MJ_SET_INFORMATION
7 IRP_MJ_QUERY_EA
8 IRP_MJ_SET_EA
9 IRP_MJ_FLUSH_BUFFERS
a IRP_MJ_QUERY_VOLUME_INFORMATION
b IRP_MJ_SET_VOLUME_INFORMATION
c IRP_MJ_DIRECTORY_CONTROL
d IRP_MJ_FILE_SYSTEM_CONTROL
e IRP_MJ_DEVICE_CONTROL
f IRP_MJ_INTERNAL_DEVICE_CONTROL /
IRP_MJ_SCSI
 [00] IRP_MN_SCSI_CLASS
 [01] IRP_MN_SCSI_CLASS
10 IRP_MJ_SHUTDOWN
11 IRP_MJ_LOCK_CONTROL
12 IRP_MJ_CLEANUP
13 IRP_MJ_CREATE_MAILSLOT
14 IRP_MJ_QUERY_SECURITY
15 IRP_MJ_SET_SECURITY
16 IRP_MJ_POWER
 [00] IRP_MN_WAIT_WAKE
 [01] IRP_MN_POWER_SEQUENCE
 [02] IRP_MN_SET_POWER
 [03] IRP_MN_QUERY_POWER
17 IRP_MJ_SYSTEM_CONTROL
 [00] IRP_MN_QUERY_ALL_DATA
 [01] IRP_MN_QUERY_SINGLE_INSTANCE
 [02] IRP_MN_CHANGE_SINGLE_INSTANCE
 [03] IRP_MN_CHANGE_SINGLE_ITEM
 [04] IRP_MN_ENABLE_EVENTS
 [05] IRP_MN_DISABLE_EVENTS 
 [06] IRP_MN_ENABLE_COLLECTION
 [07] IRP_MN_DISABLE_COLLECTION
 [08] IRP_MN_REGINFO
 [09] IRP_MN_EXECUTE_METHOD
 [0a] reserved
 [0b] IRP_MN_REGINFO_EX
18 IRP_MJ_DEVICE_CHANGE
19 IRP_MJ_QUERY_QUOTA
1a IRP_MJ_SET_QUOTA
1b IRP_MJ_PNP /
IRP_MJ_PNP_POWER /
IRP_MJ_MAXIMUM_FUNCTION
 [00] IRP_MN_START_DEVICE
 [01] IRP_MN_QUERY_REMOVE_DEVICE
 [02] IRP_MN_REMOVE_DEVICE
 [03] IRP_MN_CANCEL_REMOVE_DEVICE
 [04] IRP_MN_STOP_DEVICE
 [05] IRP_MN_QUERY_STOP_DEVICE
 [06] IRP_MN_CANCEL_STOP_DEVICE
 [07] IRP_MN_QUERY_DEVICE_RELATIONS
 [08] IRP_MN_QUERY_INTERFACE
 [09] IRP_MN_QUERY_CAPABILITIES
 [0A] IRP_MN_QUERY_RESOURCES
 [0B] IRP_MN_QUERY_RESOURCE_REQUIREMENTS
 [0C] IRP_MN_QUERY_DEVICE_TEXT
 [0D] IRP_MN_FILTER_RESOURCE_REQUIREMENTS
 [0E]
 [0F] IRP_MN_READ_CONFIG
 [10] IRP_MN_WRITE_CONFIG
 [11] IRP_MN_EJECT
 [12] IRP_MN_SET_LOCK
 [13] IRP_MN_QUERY_ID
 [14] IRP_MN_QUERY_PNP_DEVICE_STATE
 [15] IRP_MN_QUERY_BUS_INFORMATION
 [16] IRP_MN_DEVICE_USAGE_NOTIFICATION
 [17] IRP_MN_SURPRISE_REMOVAL
 [18] IRP_MN_QUERY_LEGACY_BUS_INFORMATION
 [87] IRP_MN_BUS_RESET (1394)

 

IOCTL Code
Bit 16..31 Bit 14..15 Bit 2..13 Bit 0..1
DevType Access Function Method

 

DevType
See DEVICE_OBJECT DevType Table

 

Access
Mask Name
00 FILE_ANY_ACCESS
FILE_SPECIAL_ACCESS
01 FILE_READ_ACCESS
02 FILE_WRITE_ACCESS

 

Method
Value Name
0 METHOD_BUFFERED
1 METHOD_IN_DIRECT
2 METHOD_OUT_DIRECT
3 METHOD_NEITHER