This was probably never used so far: According to the spec, polling
means ack'ing the pending IRQ and setting its corresponding bit in isr.
Moreover, we have to signal a pending IRQ via bit 7 of the returned
value, and we must not return a spurious IRQ if none is pending.
This implements the poll command without the help of pic_poll_read which
is left untouched as pic_intack_read is still using it.
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
int ret;
if (s->poll) {
- ret = pic_poll_read(s);
+ ret = pic_get_irq(s);
+ if (ret >= 0) {
+ pic_intack(s, ret);
+ ret |= 0x80;
+ } else {
+ ret = 0;
+ }
s->poll = 0;
} else {
if (addr == 0) {