DDI_DEVICE_ZERO(9F)DDI_DEVICE_ZERO(9F)NAMEddi_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:
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_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 VALUESddi_device_zero() returns:
DDI_SUCCESS
Successfully zeroed the data.
DDI_FAILURE
The byte count is not a multiple of dev_datasz.
CONTEXTddi_device_zero() can be called from user, kernel, or interrupt con‐
text.
SEE ALSOddi_regs_map_free(9F), ddi_regs_map_setup(9F)
Writing Device Drivers
Sep 25, 1996 DDI_DEVICE_ZERO(9F)
