/*
* NOTE: This routine must be called with interrupts disabled in the CPSR.
*/
static void
at91aic_calculate_masks(void)
{
struct intrq *iq;
struct intrhand *ih;
int irq, ipl;
/* First, figure out which IPLs each IRQ has. */
for (irq = 0; irq < NIRQ; irq++) {
int levels = 0;
iq = &intrq[irq];
at91_disable_irq(irq);
for (ih = TAILQ_FIRST(&iq->iq_list); ih != NULL;
ih = TAILQ_NEXT(ih, ih_list))
levels |= (1U << ih->ih_ipl);
iq->iq_levels = levels;
}
/* Next, figure out which IRQs are used by each IPL. */
for (ipl = 0; ipl < NIPL; ipl++) {
int aic_irqs = 0;
for (irq = 0; irq < AIC_NIRQ; irq++) {
if (intrq[irq].iq_levels & (1U << ipl))
aic_irqs |= (1U << irq);
}
aic_imask[ipl] = aic_irqs;
}
aic_imask[IPL_NONE] = 0;
/*
* splvm() blocks all interrupts that use the kernel memory
* allocation facilities.
*/
aic_imask[IPL_VM] |= aic_imask[IPL_NONE];
/*
* splclock() must block anything that uses the scheduler.
*/
aic_imask[IPL_CLOCK] |= aic_imask[IPL_VM];
/*
* splhigh() must block "everything".
*/
aic_imask[IPL_HIGH] |= aic_imask[IPL_CLOCK];
/*
* Now compute which IRQs must be blocked when servicing any
* given IRQ.
*/
for (irq = 0; irq < MIN(NIRQ, AIC_NIRQ); irq++) {
iq = &intrq[irq];
if (TAILQ_FIRST(&iq->iq_list) != NULL)
at91_enable_irq(irq);
}
/*
* update current mask
*/
at91_set_intrmask(aic_imask[curcpl()]);
}
/*
* NOTE: This routine must be called with interrupts disabled in the CPSR.
*/
static void
at91aic_calculate_masks(void)
{
struct intrq *iq;
struct intrhand *ih;
int irq, ipl;
/* First, figure out which IPLs each IRQ has. */
for (irq = 0; irq < NIRQ; irq++) {
int levels = 0;
iq = &intrq[irq];
at91_disable_irq(irq);
for (ih = TAILQ_FIRST(&iq->iq_list); ih != NULL;
ih = TAILQ_NEXT(ih, ih_list))
levels |= (1U << ih->ih_ipl);
iq->iq_levels = levels;
}
/* Next, figure out which IRQs are used by each IPL. */
for (ipl = 0; ipl < NIPL; ipl++) {
int aic_irqs = 0;
for (irq = 0; irq < AIC_NIRQ; irq++) {
if (intrq[irq].iq_levels & (1U << ipl))
aic_irqs |= (1U << irq);
}
aic_imask[ipl] = aic_irqs;
}
/* IPL_NONE must open up all interrupts */
KASSERT(aic_imask[IPL_NONE] == 0);
KASSERT(aic_imask[IPL_SOFTCLOCK] == 0);
KASSERT(aic_imask[IPL_SOFTBIO] == 0);
KASSERT(aic_imask[IPL_SOFTNET] == 0);
KASSERT(aic_imask[IPL_SOFTSERIAL] == 0);
/*
* Enforce a hierarchy that gives "slow" device (or devices with
* limited input buffer space/"real-time" requirements) a better
* chance at not dropping data.
*/
aic_imask[IPL_SCHED] |= aic_imask[IPL_VM];
aic_imask[IPL_HIGH] |= aic_imask[IPL_SCHED];
/*
* Now compute which IRQs must be blocked when servicing any
* given IRQ.
*/
for (irq = 0; irq < MIN(NIRQ, AIC_NIRQ); irq++) {
iq = &intrq[irq];
if (TAILQ_FIRST(&iq->iq_list) != NULL)
at91_enable_irq(irq);
}
/*
* update current mask
*/
at91_set_intrmask(aic_imask[curcpl()]);
}