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/* bsp_irq_asm.S
*
* This file contains the implementation of the IRQ handler
* for a specific BSP
*
* CopyRight (C) 2000 Canon Research France SA.
* Emmanuel Raguet, mailto:raguet@crf.canon.fr
*
* The license and distribution terms for this file may be
* found in found in the file LICENSE in this distribution or at
* http://www.OARcorp.com/rtems/license.html.
*
*/
#define __asm__
#include <registers.h>
/*
* Function to obtain, execute an IT handler and acknowledge the IT
*/
.globl ExecuteITHandler
ExecuteITHandler :
ldr r0, =INTPHAI3 /* read the vector number */
ldr r0, [r0]
ldr r0, [r0] /* extract the IT handler @ */
/*
* re-enable interrupts at processor level as the current
* interrupt source is now masked via VEGA logic
*/
mrs r1, cpsr
and r1, r1, #0xFFFFFF3F
msr cpsr, r1
stmdb sp!,{lr}
ldr lr, =IRQ_return /* prepare the return from handler */
mov pc, r0 /* EXECUTE INT HANDLER */
IRQ_return:
ldmia sp!,{lr}
ldr r2, =INTSTAT3 /* Ack the interrupt */
ldr r2, [r2]
ldr r1, =INTACK3
str r2, [r1]
/*
* disable interrupts_again and switch back to SVC mode
*/
mrs r0, cpsr
orr r0, r0, #0xc3
msr cpsr, r0
b ReturnFromHandler /* return to ISR handler */
/*
* Function to acknowledge the IT controller
*/
.globl AckControler
AckControler:
ldr r0, =INTEOI3
mov r1, #EOI
str r1, [r0]
b ReturnFromAck /* return to ISR handler */
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