Archipelago » qemu

/*

 * isa_reserve_irq() reserves the ISA irq and returns the corresponding

 * qemu_irq entry for the i8259.

 *

 * This function is only for special cases such as the 'ferr', and

 * temporary use for normal devices until they are converted to qdev.

 */

qemu_irq isa_reserve_irq(int isairq)

{

    if (isairq < 0 || isairq > 15) {

        fprintf(stderr, "isa irq %d invalid\n", isairq);

        exit(1);

    }

    if (isabus->assigned & (1 << isairq)) {

        fprintf(stderr, "isa irq %d already assigned\n", isairq);

        exit(1);

    }

    isabus->assigned |= (1 << isairq);

    return isabus->irqs[isairq];

}