static void port92_write(void *opaque, hwaddr addr, uint64_t val, unsigned size) { Port92State *s = opaque; int oldval = s->outport; DPRINTF("port92: write 0x%02" PRIx64 "\n", val); s->outport = val; qemu_set_irq(*s->a20_out, (val >> 1) & 1); if ((val & 1) && !(oldval & 1)) { qemu_system_reset_request(); } }