Function mips_pic_map_fixed_intr

freebsd/mips/mips/mips_pic.c:455–506

* Allocate a fixed IRQ mapping for the given MIPS @p irq, or return the * existing mapping if @p irq was previously mapped. * * @param irq The MIPS IRQ to be mapped. * @param[out] mapping On success, will be populated with the interrupt * mapping. * * @retval 0 success * @retval EINVAL if @p irq is not a valid MIPS IRQ#. * @retval non-zero If allocating the MIPS IRQ mapping otherwise

 *			regular unix error code will be returned.
 */
static int
mips_pic_map_fixed_intr(u_int irq, struct mips_pic_intr **mapping)
{
	struct mips_pic_intr		*intr;
	struct intr_map_data_mips_pic	*data;
	device_t			 pic_dev;
	uintptr_t			 xref;

	if (irq < 0 || irq >= nitems(mips_pic_intrs))
		return (EINVAL);

	mtx_lock(&mips_pic_mtx);

	/* Fetch corresponding interrupt entry */
	intr = &mips_pic_intrs[irq];
	KASSERT(intr->mips_irq == irq,
		("intr %u found at index %u", intr->mips_irq, irq));

	/* Already mapped? */
	if (intr->intr_irq != INTR_IRQ_INVALID) {
		mtx_unlock(&mips_pic_mtx);
		*mapping = intr;
		return (0);
	}

	/* Map the interrupt */
	data = (struct intr_map_data_mips_pic *)intr_alloc_map_data(
		INTR_MAP_DATA_MIPS, sizeof(*data), M_WAITOK | M_ZERO);
	data->irq = intr->mips_irq;

#ifdef FDT
	/* PIC must be attached on FDT devices */
	KASSERT(pic_sc != NULL, ("%s: no pic", __func__));

	pic_dev = pic_sc->pic_dev;
	xref = pic_xref(pic_dev);
#else /* !FDT */
	/* PIC has a fixed xref, and may not have been attached yet */
	pic_dev = NULL;
	if (pic_sc != NULL)
		pic_dev = pic_sc->pic_dev;

	xref = MIPS_PIC_XREF;
#endif /* FDT */

	KASSERT(intr->intr_irq == INTR_IRQ_INVALID, ("duplicate map"));
	intr->intr_irq = intr_map_irq(pic_dev, xref, &data->hdr);
	*mapping = intr;

	mtx_unlock(&mips_pic_mtx);
	return (0);
}

/**
 *