ICH_DTBL_LENGTH
sc->dtbl_size = sizeof(struct ich_desc) * ICH_DTBL_LENGTH *
for (i = 0; i < ICH_DTBL_LENGTH; i++) {
ch->dtbl = sc->dtbl + (ch->num * ICH_DTBL_LENGTH);
(ch->num * ICH_DTBL_LENGTH * sizeof(struct ich_desc));
lvi %= ICH_DTBL_LENGTH;