DDI_POKE(9F) Kernel Functions for Drivers DDI_POKE(9F)

NAME

ddi_poke, ddi_poke8, ddi_poke16, ddi_poke32, ddi_poke64 - write a value
to a location

SYNOPSIS

#include <sys/ddi.h>
#include <sys/sunddi.h>


int ddi_poke8(dev_info_t *dip, int8_t *addr, int8_t value);


int ddi_poke16(dev_info_t *dip, int16_t *addr, int16_t value);


int ddi_poke32(dev_info_t *dip, int32_t *addr, int32_t value);


int ddi_poke64(dev_info_t *dip, int64_t *addr, int64_t value);

INTERFACE LEVEL

illumos DDI specific (illumos DDI). The ddi_pokec(), ddi_pokes(),
ddi_pokel(), and ddi_poked() functions are obsolete. Use, respectively,
ddi_poke8(), ddi_poke16(), ddi_poke32(), and ddi_poke64(), instead.

PARAMETERS

dip
A pointer to the device's dev_info structure.


addr
Virtual address of the location to be written to.


value
Value to be written to the location.

DESCRIPTION

These routines cautiously attempt to write a value to a specified virtual
address, using the parent nexus driver to assist in the process where
necessary.


If the address is not valid, or the value cannot be written without an
error occurring, an error code is returned.


These routines are most useful when first trying to establish the
presence of a given device on the system in a driver's probe(9E) or
attach(9E) routines.


On multiprocessing machines these routines can be extremely heavy-weight,
so use the ddi_peek(9F) routines instead if possible.

RETURN VALUES

DDI_SUCCESS
The value was successfully written to the given virtual
address.


DDI_FAILURE
An error occurred while trying to write to the location.

CONTEXT

These functions can be called from user, interrupt, or kernel context.

SEE ALSO

attach(9E), probe(9E), ddi_peek(9F)


Writing Device Drivers


January 16, 2006 DDI_POKE(9F)