CMDK_HWIDLEN
hwid = kmem_alloc(CMDK_HWIDLEN, KM_SLEEP);
modlen = cmdk_get_modser(dkp, DIOCTL_GETMODEL, hwid, CMDK_HWIDLEN);
hwid + modlen, CMDK_HWIDLEN - modlen);
kmem_free(hwid, CMDK_HWIDLEN);