浅析开发板相关函数init_irq即ep93xx_init_irq什么时候执行

文件：init/main.c
start_kernel
==> setup_arch(&command_line);
文件：arch/arm/kernel/setup.c
setup_arch
    /*
     * Set up various architecture-specific pointers
     */
    init_arch_irq = mdesc->init_irq;
    system_timer = mdesc->timer;
    init_machine = mdesc->init_machine;

文件：init/main.c
start_kernel
==> init_IRQ()

文件：arch/arm/kernel/irq.c
void __init init_IRQ(void)
{
    int irq;

    for (irq = 0; irq < NR_IRQS; irq++)
        irq_desc[irq].status |= IRQ_NOREQUEST | IRQ_NOPROBE;

#ifdef CONFIG_SMP
    cpumask_setall(bad_irq_desc.affinity);
    bad_irq_desc.cpu = smp_processor_id();
#endif
    init_arch_irq();
}


MACHINE_START(EDB9312, "Cirrus Logic EDB9312 Evaluation Board")
    /* Maintainer: Toufeeq Hussain */
    .phys_io    = EP93XX_APB_PHYS_BASE,
    .io_pg_offst    = ((EP93XX_APB_VIRT_BASE) >> 18) & 0xfffc,
    .boot_params    = EP93XX_SDCE3_PHYS_BASE_SYNC + 0x100,
    .map_io        = ep93xx_map_io,
    .init_irq    = ep93xx_init_irq,[luther.gliethttp]
    .timer        = &ep93xx_timer,
    .init_machine    = edb9312_init_machine,
MACHINE_END