ns-cfgmgr32-io_des.md

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NS:cfgmgr32.IO_Des_s	IO_DES (cfgmgr32.h)	The IO_DES structure is used for specifying either a resource list or a resource requirements list that describes I/O port usage for a device instance. For more information about resource lists and resource requirements lists, see Hardware Resources.	*PIO_DES IO_DES IO_DES structure [Device and Driver Installation] PIO_DES PIO_DES structure pointer [Device and Driver Installation] cfgmgr32/IO_DES cfgmgr32/PIO_DES cfgmgrst_027e9190-0074-48e2-89cd-aa86e8a08165.xml devinst.io_des	devinst\io_des.htm	devinst	4b2ae544-0254-4221-80df-e2df4a23d15f	12/05/2018	*PIO_DES, IO_DES, IO_DES structure [Device and Driver Installation], PIO_DES, PIO_DES structure pointer [Device and Driver Installation], cfgmgr32/IO_DES, cfgmgr32/PIO_DES, cfgmgrst_027e9190-0074-48e2-89cd-aa86e8a08165.xml, devinst.io_des	cfgmgr32.h	Cfgmgr32.h	Windows															Windows	IO_DES, *PIO_DES		19H1	IO_Des_s cfgmgr32/IO_Des_s PIO_DES cfgmgr32/PIO_DES IO_DES cfgmgr32/IO_DES	c++	APIRef kbSyntax	HeaderDef	cfgmgr32.h	IO_DES

IO_DES structure

-description

The IO_DES structure is used for specifying either a resource list or a resource requirements list that describes I/O port usage for a device instance. For more information about resource lists and resource requirements lists, see Hardware Resources.

-struct-fields

-field IOD_Count

For a resource list:

Zero.

For a resource requirements list:

The number of elements in the IO_RANGE array that is included in the IO_RESOURCE structure.

-field IOD_Type

Must be set to the constant value IOType_Range.

-field IOD_Alloc_Base

For a resource list:

The lowest-numbered of a range of contiguous I/O port addresses allocated to the device.

For a resource requirements list:

Zero.

-field IOD_Alloc_End

For a resource list:

The highest-numbered of a range of contiguous I/O port addresses allocated to the device.

For a resource requirements list:

Zero.

-field IOD_DesFlags

One bit flag from each of the flag sets described in the following table.

	Flag	Definition
Port Type Flags
	fIOD_IO	The device is accessed in I/O address space.
	fIOD_Memory	The device is accessed in memory address space.
	fIOD_PortType	Bitmask for the bits within IOD_DesFlags that specify the port type value.
Decode Flags
	fIOD_10_BIT_DECODE	The device decodes 10 bits of the port address.
	fIOD_12_BIT_DECODE	The device decodes 12 bits of the port address.
	fIOD_16_BIT_DECODE	The device decodes 16 bits of the port address.
	fIOD_POSITIVE_DECODE	The device uses "positive decode" instead of "subtractive decode."
	fIOD_DECODE	Bitmask for the bits within IOD_DesFlags that specify the decode value.

-see-also

IO_RANGE

IO_RESOURCE