ASY_ISR
isr = asy_get(asy, ASY_ISR);
(void) asy_get(asy, ASY_ISR);
const uint8_t intr_id = asy_get(asy, ASY_ISR);
const uint8_t intr_id = asy_get(asy, ASY_ISR);
[ASY_ISR] = { ASY_8250A, 2, asy_get_reg, NULL },