te
Copyright (c) 1996, Sun Microsystems, Inc All Rights Reserved
The contents of this file are subject to the terms of the Common Development and Distribution License (the "License"). You may not use this file except in compliance with the License.
You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE or http://www.opensolaris.org/os/licensing. See the License for the specific language governing permissions and limitations under the License.
When distributing Covered Code, include this CDDL HEADER in each file and include the License file at usr/src/OPENSOLARIS.LICENSE. If applicable, add the following below this CDDL HEADER, with the fields enclosed by brackets "[]" replaced with your own identifying information: Portions Copyright [yyyy] [name of copyright owner]
ddi_device_copy - copy data from one device register to another device register

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



int ddi_device_copy(ddi_acc_handle_t src_handle, caddr_t src_addr, 
 ssize_t src_advcnt, ddi_acc_handle_t dest_handle,
 caddr_t dest_addr, ssize_t dest_advcnt, 
 size_t bytecount, uint_t dev_datasz);

Solaris DDI specific (Solaris DDI).

src_handle

src_addr

src_advcnt

dest_handle

dest_addr

dest_advcnt

bytecount

dev_datasz

ddi_device_copy() copies bytecount bytes from the source address, src_addr, to the destination address, dest_addr. The attributes encoded in the access handles, src_handle and dest_handle, govern how data is actually copied from the source to the destination. Only matching data sizes between the source and destination are supported.

Data will automatically be translated to maintain a consistent view between the source and the destination. The translation may involve byte-swapping if the source and the destination devices have incompatible endian characteristics.

The src_advcnt and dest_advcnt arguments specifies the number of dev_datasz units to advance with each access to the device addresses. A value of 0 will use the same source and destination device address on every access. A positive value increments the corresponding device address by certain number of data size units in the next access. On the other hand, a negative value decrements the device address.

The dev_datasz argument determines the size of the data word on each access. The data size must be the same between the source and destination.

ddi_device_copy() returns:

DDI_SUCCESS

DDI_FAILURE

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

ddi_regs_map_free(9F), ddi_regs_map_setup(9F)

Writing Device Drivers