source: rtems/c/src/lib/libcpu/arm/pxa255/irq/bsp_irq_asm.S @ 359e537

/*
 * PXA255 Interrupt handler by Yang Xi <hiyangxi@gmail.com>
 * Copyright (c) 2004 by Jay Monkman <jtm@lopgindog.com>
 *
 *  The license and distribution terms for this file may be
 *  found in the file LICENSE in this distribution or at
 *  http://www.rtems.com/license/LICENSE.
 *
 *  $Id$
 */

#define __asm__

        .globl bsp_interrupt_dispatch
bsp_interrupt_dispatch :
/*
 * Look at interrupt status register to determine source.
 * From source, determine offset into expanded vector table
 * and load vector into r0 and handler address into r1.
 */
        ldr     r0,=0x40d00000
        ldr     r1,[r0]
        clz     r0,r1
        cmp     r0,#32
        moveq   pc,lr   /*All zeros*/
        mov     r2,#31
        sub     r0,r2,r0
        ldr     r2,=IRQ_table
        add     r2,r2,r0,LSL #2
        ldr     r1,[r2]
        mov     pc,r1