NAME

ddi_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, u_int rnumber,
off_t ∗resultp)

INTERFACE LEVEL

SPARC architecture specific (SPARC DDI). 

DESCRIPTION

ddi_dev_regsize() returns the size, in bytes, of the device register specified by dipandrnumber. This is useful when, for example, one of the registers is a frame buffer with a varying size known only to its proms.

ARGUMENTS

dip A pointer to the device’s dev_info structure. 

rnumber The ordinal register number. Device registers are associated 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). 

RETURN VALUES

ddi_dev_regsize() returns:

DDI_SUCCESS
A successful return. The size, in bytes, of the specified register, is set in resultp.

DDI_FAILURE
An invalid (nonexistent) register number was specified.

CONTEXT

ddi_dev_regsize() can be called from user or interrupt context.

SEE ALSO

ddi_dev_nintrs(9F), ddi_dev_nregs(9F)

SunOS 5.1  —  Last change: 24 Oct 1991