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ddi_device_zero - zero fill the device

#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);

illumos DDI specific (illumos DDI). handle dev_addr bytecount dev_advcnt dev_datasz 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.

ddi_device_zero() returns: DDI_SUCCESS DDI_FAILURE ddi_device_zero() can be called from user, kernel, or interrupt context. ddi_regs_map_free (9F), ddi_regs_map_setup (9F)

Writing Device Drivers