Content-type: text/html Man page of ddi_device_zero

ddi_device_zero

Section: Kernel Functions for Drivers (9F)
Updated: 25 Sep 1996
Index Return to Main Contents
 

NAME

ddi_device_zero - zero fill the device  

SYNOPSIS

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

int ddi_device_zero(ddi_acc_handle_t handle, caddr_t dev_addr, size_t bytecount, ssize_t dev_advcnt, uint_t dev_datasz);  

INTERFACE LEVEL

Solaris DDI specific (Solaris DDI).  

PARAMETERS

handle The data access handle returned from setup calls, such as ddi_regs_map_setup(9F).

dev_addr Beginning of the device address.

bytecount Number of bytes to zero.

dev_advcnt Number of dev_datasz units to advance on every access.

dev_datasz The size of each data word. Possible values are defined as: "25">DDI_DATA_SZ01_ACC 1 byte data size

DDI_DATA_SZ02_ACC 2 bytes data size

DDI_DATA_SZ04_ACC 4 bytes data size

DDI_DATA_SZ08_ACC 8 bytes data size

 

DESCRIPTION

ddi_device_zero() function fills the given, bytecount, number of byte of zeroes to the device register or memory.

The dev_advcnt argument determines the value of the device address, dev_addr, on each access. A value of 0 will use the same device address, dev_addr, on every access. A positive value increments the device address in the next access while a negative value decrements the address. The device address is incremented and decremented in dev_datasz units.

The dev_datasz argument determines the size of data word on each access.  

RETURN VALUES

ddi_device_zero() returns:

DDI_SUCCESS Successfully zeroed the data.

DDI_FAILURE The byte count is not a multiple of dev_datasz.

 

CONTEXT

ddi_device_zero() can be called from user, kernel, or interrupt context.  

SEE ALSO

ddi_regs_map_free(9F), ddi_regs_map_setup(9F)

Writing Device Drivers


 

Index

NAME
SYNOPSIS
INTERFACE LEVEL
PARAMETERS
DESCRIPTION
RETURN VALUES
CONTEXT
SEE ALSO

This document was created by man2html, using the manual pages.
Time: 02:39:44 GMT, October 02, 2010