Writing Device Drivers

Register Mapping

The driver should map in its device's registers, specifying the index of the register set, the data access characteristics of the device and the size of the register set to be mapped.

		ddi_device_acc_attr_t						dev_attributes;

 	dev_attributes.devacc_attr_version = DDI_DEVICE_ATTR_V0;
 	dev_attributes.devacc_attr_dataorder = DDI_STRICTORDER_ACC;
 	dev_attributes.devacc_attr_endian_flags = DDI_STRUCTURE_LE_ACC;

 	if (ddi_regs_map_setup(dip, 0, (caddr_t *)&isp->isp_reg,
 	    0, sizeof (struct ispregs), &dev_attributes,
 	    &isp->isp_acc_handle) != DDI_SUCCESS) {
 		do error recovery
			return (DDI_FAILURE);