PATH ADC Home > Documentation > Hardware > Device Managers and Drivers > PCI Card Services > Designing PCI Cards and Drivers for Power Macintosh Computers

ExpMgrIOWriteLong

You can use the ExpMgrIOWriteLong function to write a long word to an address in PCI I/O space.



 
OSErr ExpMgrIOWriteLong (

                     RegEntryIDPtr node,

                     LogicalAddress ioAddr,

                     UInt32 value);

node: A node identifier that identifies a device node. If you specify a node identifier that isn't in the device tree, ExpMgrIOWriteLong returns a result code of deviceTreeInvalidNodeErr.
ioAddr: The sum of the assigned-addresses base address of the device plus the offset to the desired I/O address.
value: The 32-bit value as it would appear on the PCI bus. The function performs the necessary byte swapping.

DESCRIPTION

The ExpMgrIOWriteLong function writes the byte-swapped value of value to the I/O address for device node node starting at address ioAddr.

RESULT CODES

`noErr`	0	No error
`deviceTreeInvalidNodeErr`	-2538	Device node not in the device tree