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Rev 2292 Rev 2307
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    return IRQ_ACCEPT;
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    return IRQ_ACCEPT;
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}
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}
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static void l_apic_timer_irq_handler(irq_t *irq, void *arg, ...)
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static void l_apic_timer_irq_handler(irq_t *irq, void *arg, ...)
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{
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{
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    /*
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     * Holding a spinlock could prevent clock() from preempting
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     * the current thread. In this case, we don't need to hold the
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     * irq->lock so we just unlock it and then lock it again.
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     */
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    spinlock_unlock(&irq->lock);
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    clock();
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    clock();
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    spinlock_lock(&irq->lock);
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}
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}
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/** Initialize APIC on BSP. */
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/** Initialize APIC on BSP. */
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void apic_init(void)
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void apic_init(void)
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{
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{
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     * Other interrupts will be forwarded to the lowest priority CPU.
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     * Other interrupts will be forwarded to the lowest priority CPU.
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     */
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     */
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    io_apic_disable_irqs(0xffff);
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    io_apic_disable_irqs(0xffff);
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    irq_initialize(&l_apic_timer_irq);
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    irq_initialize(&l_apic_timer_irq);
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    l_apic_timer_irq.preack = true;
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    l_apic_timer_irq.devno = device_assign_devno();
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    l_apic_timer_irq.devno = device_assign_devno();
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    l_apic_timer_irq.inr = IRQ_CLK;
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    l_apic_timer_irq.inr = IRQ_CLK;
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    l_apic_timer_irq.claim = l_apic_timer_claim;
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    l_apic_timer_irq.claim = l_apic_timer_claim;
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    l_apic_timer_irq.handler = l_apic_timer_irq_handler;
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    l_apic_timer_irq.handler = l_apic_timer_irq_handler;
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    irq_register(&l_apic_timer_irq);
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    irq_register(&l_apic_timer_irq);