ddi_dev_regsize(9F) Kernel Functions for Drivers ddi_dev_regsize(9F)NAMEddi_dev_regsize - return the size of a device's register
SYNOPSIS
#include <sys/conf.h>
#include <sys/ddi.h>
#include <sys/sunddi.h>
int ddi_dev_regsize(dev_info_t *dip, uint_t rnumber, off_t *resultp);
INTERFACE LEVEL
Solaris DDI specific (Solaris DDI).
PARAMETERS
dip A pointer to the device's dev_info structure.
rnumber The ordinal register number. Device registers are asso‐
ciated with a dev_info and are enumerated in arbitrary
sets from 0 on up. The number of registers a device has
can be determined from a call to ddi_dev_nregs(9F).
resultp Pointer to an integer that holds the size, in bytes, of
the described register (if it exists).
DESCRIPTION
The ddi_dev_regsize() function returns the size, in bytes, of the
device register specified by dip and rnumber. This is useful when, for
example, one of the registers is a frame buffer with a varying size
known only to its proms.
RETURN VALUES
The ddi_dev_regsize() function returns:
DDI_SUCCESS A successful return. The size, in bytes, of the speci‐
fied register, is set in resultp.
DDI_FAILURE An invalid (nonexistent) register number was specified.
CONTEXT
The ddi_dev_regsize() function can be called from user, interrupt, or
kernel context.
SEE ALSOddi_dev_nintrs(9F), ddi_dev_nregs(9F)
Writing Device Drivers
SunOS 5.10 16 Jan 2006 ddi_dev_regsize(9F)
