/*
* UART Interrupt Handler
*/
static void
uarttxintr(Ureg*, void* arg)
{
Uart *p = arg;
intrclear(UARTTXbit(p->port), 0);
p->inters++;
p->winters++;
uartxmit(p);
}
static void
uartrxintr(Ureg*, void* arg)
{
Uart *p = arg;
intrclear(UARTRXbit(p->port), 0);
p->inters++;
p->rinters++;
uartrecv(p);
}
static void
clockintr(Ureg*, void*)
{
Clock0link *lp;
m->ticks++;
checkalarms();
if(canlock(&clock0lock)){
for(lp = clock0link; lp; lp = lp->link)
if (lp->clock)
lp->clock();
unlock(&clock0lock);
}
intrclear(TIMERbit(0), 0);
}
static void
interrupt(Ureg*, void *arg)
{
ulong irq, irqe, handled;
Ether *ether = arg;
Ctlr *ctlr = ether->ctlr;
Gbereg *reg = ctlr->reg;
handled = 0;
irq = reg->irq;
irqe = reg->irqe;
reg->irqe = 0; /* extinguish intr causes */
reg->irq = 0; /* extinguish intr causes */
ethercheck(ether);
if(irq & (Irx | Irxbufferq(Qno))) {
/*
* letting a kproc process the input takes far less real time
* than doing it all at interrupt level.
*/
ctlr->haveinput = 1;
wakeup(&ctlr->rrendez);
irq &= ~(Irx | Irxbufferq(Qno));
handled++;
} else
rxkick(ctlr);
if(irq & Itxendq(Qno)) { /* transmit ring empty? */
reg->irqmask &= ~Itxendq(Qno); /* prevent more interrupts */
reg->irqemask &= ~(IEtxerrq(Qno) | IEtxunderrun);
transmit(ether);
irq &= ~Itxendq(Qno);
handled++;
}
if(irqe & IEsum) {
/*
* IElinkchg appears to only be set when unplugging.
* autonegotiation is likely not done yet, so linkup not valid,
* thus we note the link change here, and check for
* that and autonegotiation done below.
*/
if(irqe & IEphystschg) {
ether->link = (reg->ps0 & PS0linkup) != 0;
ether->linkchg = 1;
}
if(irqe & IEtxerrq(Qno))
ether->oerrs++;
if(irqe & IErxoverrun)
ether->overflows++;
if(irqe & IEtxunderrun)
ctlr->txunderrun++;
if(irqe & (IEphystschg | IEtxerrq(Qno) | IErxoverrun |
IEtxunderrun))
handled++;
}
if (irq & Isum) {
if (irq & Irxerr) { /* nil desc. ptr. or desc. owned by cpu */
ether->buffs++; /* approx. error */
/* if the input ring is full, drain it */
ctlr->haveinput = 1;
wakeup(&ctlr->rrendez);
}
if(irq & (Irxerr | Irxerrq(Qno)))
handled++;
irq &= ~(Irxerr | Irxerrq(Qno));
}
if(ether->linkchg && (reg->ps1 & PS1an_done)) {
handled++;
ether->link = (reg->ps0 & PS0linkup) != 0;
ether->linkchg = 0;
}
ctlr->newintrs++;
if (!handled) {
irq &= ~Isum;
irqe &= ~IEtxbufferq(Qno);
if (irq == 0 && irqe == 0) {
/* seems to be triggered by continuous output */
// iprint("ether1116: spurious interrupt\n");
} else
iprint("ether1116: interrupt cause unknown; "
"irq %#lux irqe %#lux\n", irq, irqe);
}
intrclear(Irqlo, ether->irq);
}
