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annotate src/video/ataricommon/SDL_xbiosmouseinterrupt.S @ 281:c5010ab8ba35

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Added initial support for Atari (thanks Patrice!)
author Sam Lantinga <slouken@libsdl.org>
date Sun, 17 Feb 2002 19:54:28 +0000
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children e4bd0cf95506
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c5010ab8ba35 Added initial support for Atari (thanks Patrice!)
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997, 1998, 1999, 2000, 2001 Sam Lantinga
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4
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5 This library is free software; you can redistribute it and/or
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6 modify it under the terms of the GNU Library General Public
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7 License as published by the Free Software Foundation; either
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8 version 2 of the License, or (at your option) any later version.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Library General Public License for more details.
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14
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15 You should have received a copy of the GNU Library General Public
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16 License along with this library; if not, write to the Free
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17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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18
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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22
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23 #ifdef SAVE_RCSID
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24 static char rcsid =
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25 "@(#) $Id$";
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26 #endif
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27
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28 /*
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29 * IKBD 6301 mouse vector
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30 *
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31 * Patrice Mandin
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32 */
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33
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34 .text
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35
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36 .globl _SDL_AtariXbiosMouseInstall
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37 .globl _SDL_AtariXbiosMouseVector
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38
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39 .globl _SDL_AtariXbios_mouseb
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40 .globl _SDL_AtariXbios_mousex
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41 .globl _SDL_AtariXbios_mousey
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42
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43 /*--- Vector installer ---*/
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44
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45 _SDL_AtariXbiosMouseInstall:
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46 movel sp@(4),a0
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47 movel sp@(8),a1
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48
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49 /* Stop interrupts */
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50
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51 movew #0x2700,sr
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52
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53 /* Save old vector */
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54
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55 movel a0@(16),oldvector
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56
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57 /* Set our routine */
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58
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59 movel a1,a0@(16)
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60
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61 /* Restart interrupts */
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62
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63 movew #0x2300,sr
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64
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65 rts
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66
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67 /*--- Our mouse vector ---*/
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68
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69 .text
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70 .even
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71 .ascii "XBRA"
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72 .ascii "_SDL"
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73 _SDL_AtariXbiosMouseVector:
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74 moveml d0/a1,sp@-
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75
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76 /* Mouse buttons */
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77 moveb (a0),d0
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78 andw #3,d0
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79 movew d0,_SDL_AtariXbios_mouseb
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80
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81 /* X movement */
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82 moveb a0@(1),d0
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83 extw d0
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84 addw d0,_SDL_AtariXbios_mousex
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85
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86 /* Y movement */
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87 moveb a0@(2),d0
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88 extw d0
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89 addw d0,_SDL_AtariXbios_mousey
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90
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91 /* Jump through old vector */
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92 movel oldvector,a1
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93 jsr (a1)
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94
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95 moveml sp@+,d0/a1
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96 rts
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97
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98 .data
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99
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100 .even
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101 .comm oldvector,4*1
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102
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103 .even
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104 .comm _SDL_AtariXbios_mousex,2*1
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105 .even
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106 .comm _SDL_AtariXbios_mousey,2*1
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107 .even
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108 .comm _SDL_AtariXbios_mouseb,2*1
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109