4.104.114.84.95
Last change
on this file since 1cfcfd3 was
1cfcfd3,
checked in by Jay Monkman <jtm@…>, on 07/15/04 at 06:25:44
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2004-07-15 Jay Monkman
- ChangeLog?, Makefile.am, clock/.cvsignore, clock/clockdrv.c,
include/mc9328mxl.h, irq/.cvsignore, irq/bsp_irq_asm.S,
irq/bsp_irq_init.c, irq/irq.c, irq/irq.h, timer/.cvsignore,
timer/timer.c: New files.
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-
Property mode set to
100644
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File size:
1.1 KB
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1 | /* |
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2 | * MC9328MXL Intererrupt handler |
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3 | * |
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4 | * Copyright (c) 2002 by Jay Monkman <jtm@lopingdog.com> |
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5 | * |
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6 | * The license and distribution terms for this file may be |
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7 | * found in the file LICENSE in this distribution or at |
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8 | * |
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9 | * http://www.OARcorp.com/rtems/license.html. |
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10 | * |
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11 | * |
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12 | * bsp_irq_asm.S,v 1.1 2002/11/13 17:55:06 joel Exp |
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13 | */ |
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14 | #define __asm__ |
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15 | |
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16 | /* |
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17 | * BSP specific interrupt handler for INT or FIQ. In here |
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18 | * you do determine which interrupt happened and call its |
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19 | * handler. |
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20 | */ |
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21 | .globl ExecuteITHandler |
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22 | ExecuteITHandler : |
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23 | /* |
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24 | * Look at interrupt status register to determine source. |
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25 | * From source, determine offset into expanded vector table |
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26 | * and load handler address into r0. |
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27 | */ |
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28 | ldr r0, =0x00223040 /* Read the vector number */ |
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29 | ldr r1, [r0] |
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30 | mov r1, r1, LSR #16 /* get the NIVECTOR into 16 LSbits */ |
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31 | |
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32 | /* find the ISR's address based on the vector */ |
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33 | ldr r0, =bsp_vector_table |
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34 | ldr r0, [r0, r1, LSL #2] /* Read the address */ |
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35 | |
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36 | |
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37 | stmdb sp!,{lr} |
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38 | ldr lr, =IRQ_return /* prepare the return from handler */ |
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39 | |
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40 | mov pc, r0 /* EXECUTE INT HANDLER */ |
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41 | |
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42 | IRQ_return: |
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43 | ldmia sp!,{lr} |
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44 | |
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45 | mov pc, lr |
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