board/dk1c20/vectors.S

   1 /*
   2  * (C) Copyright 2003, Psyent Corporation <www.psyent.com>
   3  * Scott McNutt <smcnutt@psyent.com>
   4  *
   5  * See file CREDITS for list of people who contributed to this
   6  * project.
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License as
  10  * published by the Free Software Foundation; either version 2 of
  11  * the License, or (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  21  * MA 02111-1307 USA
  22  */
  23
  24
  25 /*************************************************************************
  26  * Exception Vector Table
  27  *
  28  * This could have gone in the cpu soure tree, but the whole point of
  29  * Nios is customization -- and polluting the cpu source tree with
  30  * board-specific ifdef's really defeats the purpose, no? With this in
  31  * the board-specific tree, each board has the freedom to organize
  32  * vectors/traps, etc anyway it wants. The init code copies this table
  33  * to the proper location.
  34  *
  35  * Each board can do what it likes here. But there are four "standard"
  36  * handlers availble:
  37  *
  38  *      _cwp_lolimit    -Handles register window underflows.
  39  *      _cwp_hilimit    -Handles register window overflows.
  40  *      _timebase_int   -Increments the timebase.
  41  *      _def_xhandler   -Default exception handler.
  42  *
  43  * _timebase_int handles a Nios Timer interrupt and increments the
  44  * timestamp used for the get_timer(), reset_timer(), etc. routines. It
  45  * expects the timer to be configured like the standard-32 low priority
  46  * timer.
  47  *
  48  * _def_xhandler dispatches exceptions/traps via the external_interrupt()
  49  * routine. This lets you use the irq_install_handler() and handle your
  50  * interrupts/traps with code written in C.
  51  ************************************************************************/
  52
  53         .data
  54         .global _vectors
  55         .align  4
  56 _vectors:
  57
  58         .long   _def_xhandler@h         /* Vector 0  - NMI */
  59         .long   _cwp_lolimit@h          /* Vector 1  -  underflow */
  60         .long   _cwp_hilimit@h          /* Vector 2  - overflow */
  61
  62         .long   _def_xhandler@h         /* Vector 3 - GNUPro debug */
  63         .long   _def_xhandler@h         /* Vector 4 - GNUPro debug */
  64         .long   _def_xhandler@h         /* Vector 5 - GNUPro debug */
  65         .long   _def_xhandler@h         /* Vector 6 - future reserved */
  66         .long   _def_xhandler@h         /* Vector 7 - future reserved */
  67         .long   _def_xhandler@h         /* Vector 8 - future reserved */
  68         .long   _def_xhandler@h         /* Vector 9 - future reserved */
  69         .long   _def_xhandler@h         /* Vector 10 - future reserved */
  70         .long   _def_xhandler@h         /* Vector 11 - future reserved */
  71         .long   _def_xhandler@h         /* Vector 12 - future reserved */
  72         .long   _def_xhandler@h         /* Vector 13 - future reserved */
  73         .long   _def_xhandler@h         /* Vector 14 - future reserved */
  74         .long   _def_xhandler@h         /* Vector 15 - future reserved */
  75         .long   _def_xhandler@h         /* Vector 16 */
  76         .long   _def_xhandler@h         /* Vector 17 */
  77         .long   _def_xhandler@h         /* Vector 18 */
  78         .long   _def_xhandler@h         /* Vector 19 */
  79         .long   _def_xhandler@h         /* Vector 20 */
  80         .long   _def_xhandler@h         /* Vector 21 */
  81         .long   _def_xhandler@h         /* Vector 22 */
  82         .long   _def_xhandler@h         /* Vector 23 */
  83         .long   _def_xhandler@h         /* Vector 24 */
  84         .long   _def_xhandler@h         /* Vector 25 */
  85         .long   _def_xhandler@h         /* Vector 26 */
  86         .long   _def_xhandler@h         /* Vector 27 */
  87         .long   _def_xhandler@h         /* Vector 28 */
  88         .long   _def_xhandler@h         /* Vector 29 */
  89         .long   _def_xhandler@h         /* Vector 30 */
  90         .long   _def_xhandler@h         /* Vector 31 */
  91         .long   _def_xhandler@h         /* Vector 32 */
  92         .long   _def_xhandler@h         /* Vector 33 */
  93         .long   _def_xhandler@h         /* Vector 34 */
  94         .long   _def_xhandler@h         /* Vector 35 */
  95         .long   _def_xhandler@h         /* Vector 36 */
  96         .long   _def_xhandler@h         /* Vector 37 */
  97         .long   _def_xhandler@h         /* Vector 38 */
  98         .long   _def_xhandler@h         /* Vector 39 */
  99         .long   _def_xhandler@h         /* Vector 40 */
 100         .long   _def_xhandler@h         /* Vector 41 */
 101         .long   _def_xhandler@h         /* Vector 42 */
 102         .long   _def_xhandler@h         /* Vector 43 */
 103         .long   _def_xhandler@h         /* Vector 44 */
 104         .long   _def_xhandler@h         /* Vector 45 */
 105         .long   _def_xhandler@h         /* Vector 46 */
 106         .long   _def_xhandler@h         /* Vector 47 */
 107         .long   _def_xhandler@h         /* Vector 48 */
 108         .long   _def_xhandler@h         /* Vector 49 */
 109         .long   _timebase_int@h         /* Vector 50 - lopri timer*/
 110         .long   _def_xhandler@h         /* Vector 51 */
 111         .long   _def_xhandler@h         /* Vector 52 */
 112         .long   _def_xhandler@h         /* Vector 53 */
 113         .long   _def_xhandler@h         /* Vector 54 */
 114         .long   _def_xhandler@h         /* Vector 55 */
 115         .long   _def_xhandler@h         /* Vector 56 */
 116         .long   _def_xhandler@h         /* Vector 57 */
 117         .long   _def_xhandler@h         /* Vector 58 */
 118         .long   _def_xhandler@h         /* Vector 59 */
 119         .long   _def_xhandler@h         /* Vector 60 */
 120         .long   _def_xhandler@h         /* Vector 61 */
 121         .long   _def_xhandler@h         /* Vector 62 */
 122         .long   _def_xhandler@h         /* Vector 63 */
 123
 124