DDI_DEVICE_COPY(9F)DDI_DEVICE_COPY(9F)NAMEddi_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
Solaris DDI specific (Solaris 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
DESCRIPTIONddi_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 incompat‐
ible 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 destina‐
tion.
RETURN VALUESddi_device_copy() returns:
DDI_SUCCESS
Successfully transferred the data.
DDI_FAILURE
The byte count is not a multiple dev_datasz.
CONTEXTddi_device_copy() can be called from user, kernel, or interrupt con‐
text.
SEE ALSOddi_regs_map_free(9F), ddi_regs_map_setup(9F)
Writing Device Drivers
Nov 15, 1996 DDI_DEVICE_COPY(9F)
