ddi_dev_regsize(9F)

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, 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
           associated with a dev_info and are enumerated in arbi-
           trary 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

     ddi_dev_regsize() 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

     ddi_dev_regsize() 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  speci-
           fied.

CONTEXT

     ddi_dev_regsize() can be called from user or interrupt  con-
     text.

SEE ALSO

     ddi_dev_nintrs(9F), ddi_dev_nregs(9F)

     Writing Device Drivers