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jump to irq_trampoline on ARM IRQ (0x00000018);
when an irq device is attached to system, it registers its xxx_irq to jump into from irq_trampoline().

/*
 * $Id: irq_trampoline.c,v 1.1 2007/10/29 20:34:23 init Exp $
 */

/*
 * IRQ trampoline.
 * Will enter here when Core IRQ line is asserted.
 * IRQ controller driver configures us to call him on assert;
 * by default (until some irqc attached) we just return doing nothing.
 */

void
__do_nothing_and_return(void)
{

	__asm __volatile("mov r1,r1");
}

void 	(*irq_trampoline)(void) = __do_nothing_and_return;