NAME

ddi_device_copy - copy data from one device register to another device register

SYNOPSIS

#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);

INTERFACE LEVEL

illumos DDI specific (illumos DDI).

PARAMETERS

src_handle

The data access handle of the source device.

src_addr

Base data source address.

src_advcnt

Number of dev_datasz units to advance on every access.

dest_handle

The data access handle of the destination device.

dest_addr

Base data destination address.

dest_advcnt

Number of dev_datasz units to advance on every access.

bytecount

Number of bytes to transfer.

dev_datasz

The size of each data word. Possible values are defined as:

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_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.

RETURN VALUES

ddi_device_copy() returns:

DDI_SUCCESS

Successfully transferred the data.

DDI_FAILURE

The byte count is not a multiple dev_datasz.

CONTEXT

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