1 | /* |
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2 | * Handle MCF5206 TIMER2 interrupts. |
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3 | * |
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4 | * All code in this routine is pure overhead which can perturb the |
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5 | * accuracy of RTEMS' timing test suite. |
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6 | * |
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7 | * See also: Read_timer() |
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8 | * |
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9 | * To reduce overhead this is best to be the "rawest" hardware interupt |
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10 | * handler you can write. This should be the only interrupt which can |
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11 | * occur during the measured time period. |
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12 | * |
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13 | * An external counter, Timer_interrupts, is incremented. |
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14 | * |
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15 | * Copyright (C) 2000 OKTET Ltd., St.-Petersburg, Russia |
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16 | * Author: Victor V. Vengerov <vvv@oktet.ru> |
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17 | * |
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18 | * This file based on work: |
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19 | * Author: |
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20 | * David Fiddes, D.J@fiddes.surfaid.org |
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21 | * http://www.calm.hw.ac.uk/davidf/coldfire/ |
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22 | * |
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23 | * COPYRIGHT (c) 1989-1998. |
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24 | * On-Line Applications Research Corporation (OAR). |
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25 | * |
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26 | * The license and distribution terms for this file may be |
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27 | * found in the file LICENSE in this distribution or at |
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28 | * |
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29 | * http://www.rtems.com/license/LICENSE. |
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30 | * |
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31 | * $Id$ |
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32 | */ |
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33 | |
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34 | #include <rtems/asm.h> |
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35 | #include "bsp.h" |
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36 | #include "mcf5206/mcf5206e.h" |
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37 | |
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38 | BEGIN_CODE |
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39 | PUBLIC(timerisr) |
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40 | SYM(timerisr): |
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41 | move.l a0, a7@- |
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42 | move.l #MCF5206E_TER(BSP_MEM_ADDR_IMM, 2), a0 |
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43 | move.b # (MCF5206E_TER_REF + MCF5206E_TER_CAP), (a0) |
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44 | addq.l #1,SYM(Timer_interrupts) | increment timer value |
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45 | move.l a7@+, a0 |
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46 | rte |
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47 | END_CODE |
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48 | END |
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