static int
openpic_acknowledge_io_interrupt(void *cookie)
{
openpic_info *info = (openpic_info*)cookie;
int cpu = 0;
// Note: We direct all I/O interrupts to CPU 0. We could nevertheless
// check against the value of the "Who Am I Register".
int irq = openpic_read_irq(info, cpu);
if (irq == 255)
return -1; // spurious interrupt
// signal end of interrupt
openpic_eoi(info, cpu);
return irq;
}
int
opic_get_irq(struct pic_ops *pic, int mode)
{
return openpic_read_irq(curcpu()->ci_index);
}
static status_t
openpic_init(openpic_info *info)
{
uint32 x = openpic_read(info, OPENPIC_FEATURE);
const char *featureVersion;
char versionBuffer[64];
switch (x & OPENPIC_FEATURE_VERSION_MASK) {
case 1:
featureVersion = "1.0";
break;
case 2:
featureVersion = "1.2";
break;
case 3:
featureVersion = "1.3";
break;
default:
snprintf(versionBuffer, sizeof(versionBuffer),
"unknown (feature reg: 0x%lx)", x);
featureVersion = versionBuffer;
break;
}
info->cpu_count = ((x & OPENPIC_FEATURE_LAST_CPU_MASK) >>
OPENPIC_FEATURE_LAST_CPU_SHIFT) + 1;
info->irq_count = ((x & OPENPIC_FEATURE_LAST_IRQ_MASK) >>
OPENPIC_FEATURE_LAST_IRQ_SHIFT) + 1;
/*
* PSIM seems to report 1 too many IRQs
*/
// if (sc->sc_psim)
// sc->sc_nirq--;
dprintf("openpic: Version %s, supports %d CPUs and %d irqs\n",
featureVersion, info->cpu_count, info->irq_count);
/* disable all interrupts */
for (int irq = 0; irq < info->irq_count; irq++)
openpic_write(info, OPENPIC_SRC_VECTOR(irq), OPENPIC_IMASK);
openpic_set_priority(info, 0, 15);
/* we don't need 8259 passthrough mode */
x = openpic_read(info, OPENPIC_CONFIG);
x |= OPENPIC_CONFIG_8259_PASSTHRU_DISABLE;
openpic_write(info, OPENPIC_CONFIG, x);
/* send all interrupts to cpu 0 */
for (int irq = 0; irq < info->irq_count; irq++)
openpic_write(info, OPENPIC_IDEST(irq), 1 << 0);
for (int irq = 0; irq < info->irq_count; irq++) {
x = irq;
x |= OPENPIC_IMASK;
x |= OPENPIC_POLARITY_POSITIVE;
x |= OPENPIC_SENSE_LEVEL;
x |= 8 << OPENPIC_PRIORITY_SHIFT;
openpic_write(info, OPENPIC_SRC_VECTOR(irq), x);
}
/* XXX IPI */
/* XXX set spurious intr vector */
openpic_set_priority(info, 0, 0);
/* clear all pending interrupts */
for (int irq = 0; irq < info->irq_count; irq++) {
openpic_read_irq(info, 0);
openpic_eoi(info, 0);
}
return B_OK;
}
