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/*
* LPC22XX/LPC21xx Intererrupt handler
*
* Modified by Ray <rayx.cn@gmail.com> 2006 from Jay Monkman's code
*
* 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__
/*
* BSP specific interrupt handler for INT or FIQ. In here
* you do determine which interrupt happened and call its
* handler.
*/
.globl ExecuteITHandler
ExecuteITHandler :
/*
* Look at interrupt status register to determine source.
* From source, determine offset into expanded vector table
* and load handler address into r0.
*/
ldr r0, =0xFFFFF030 /* Read the vector number */
ldr r1, [r0]
/* find the ISR's address based on the vector VICVectAddr0 */
/*ldr r0, =0xFFFFF100*/
/*ldr r0, [r0, r1, LSL #2]*/ /* Read the address */
stmdb sp!,{lr}
ldr lr, =IRQ_return /* prepare the return from handler */
mov pc, r1 /* EXECUTE INT HANDLER */
IRQ_return:
ldmia sp!,{lr}
mov pc, lr
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