blob: 36a34b1edea2dda019f731610d783be8b4d25a16 (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
|
/*
* Atmel AT91RM9200 Interrupt handler
*
* 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.OARcorp.com/rtems/license.html.
*
*
* $Id$
*/
#define __asm__
.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, =0xFFFFF100 /* AIC_CTL_BASE + AIC_IVR */
ldr r1, [r0]
str r1, [r0] /* write back in case we are using protect */
stmdb sp!,{lr}
ldr lr, =IRQ_return /* prepare the return from handler */
mov pc, r1 /* execute handler */
IRQ_return:
ldr r2, =0xFFFFF130 /* AIC_CTL_BASE + AIC_EIOCR */
str r1, [r2]
ldmia sp!,{lr}
mov pc, lr
|
