Sun Microsystems, Inc.
spacerspacer
spacer   www.sun.com docs.sun.com | | |  
spacer
black dot
   
A   B   C   D   E   F   G   H   I   J   K   L   M   N   O   P   Q   R   S   T   U   V   W   X   Y   Z
    
 
Kernel Functions for Driversddi_poke(9F)


NAME

 ddi_poke, ddi_poke8, ddi_poke16, ddi_poke32, ddi_poke64, ddi_pokec, ddi_pokes, ddi_pokel, ddi_poked - 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

 

Solaris DDI specific (Solaris DDI).

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 or interrupt context.

SEE ALSO

 

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

Writing Device Drivers

NOTES

 

The functions described in this manual page previously used symbolic names which specified their data access size; the function names have been changed so they now specify a fixed-width data size. See the following table for the new name equivalents:

Previous NameNew Name
ddi_pokecddi_poke8
ddi_pokesddi_poke16
ddi_pokelddi_poke32
ddi_pokedddi_poke64

SunOS 5.9Go To TopLast Changed 20 Nov 1996

 
      
      
Copyright 2002 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms.