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annotate src/timer/mint/SDL_vbltimer.S @ 519:c7da0cd5ae5e

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author Sam Lantinga <slouken@libsdl.org>
date Mon, 07 Oct 2002 15:36:32 +0000
parents f6ffac90895c
children c9b51268668f
rev   line source
281
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1 /*
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2 SDL - Simple DirectMedia Layer
297
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3 Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002 Sam Lantinga
281
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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 * VBL queue routine
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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 #define _vbl_queue 0x456
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35
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36 .text
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37
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38 .globl _SDL_AtariVblInstall
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39 .globl _SDL_AtariVblUninstall
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40
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41 /*--- Vector installer ---*/
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42
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43 _SDL_AtariVblInstall:
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44 movel sp@(4),my_vector
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45 lea _my_vbl,a0
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46
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47 clrw vbl_mutex
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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 /* Read vbl_queue pointer */
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54 movel _vbl_queue.w,a1
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55
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56 /* Search a free place */
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57 moveq #7,d0
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58 bcl_search_place:
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59 movel (a1),d1
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60 beqs place_found
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61 addql #4,a1
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62 dbra d0,bcl_search_place
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63
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64 /* Not found */
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65 moveq #1,d0
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66 bras exit_vbl_queue
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67
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68 /* Then install ourselves */
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69 place_found:
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70 movel a0,(a1)
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71 moveq #0,d0
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72
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73 exit_vbl_queue:
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74 /* Restart interrupts */
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75 movew #0x2300,sr
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76
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77 rts
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78
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79 /*--- Vector uninstaller ---*/
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80
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81 _SDL_AtariVblUninstall:
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82 movel sp@(4),d0
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83 cmpl my_vector,d0
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84 bnes badvector
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85
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86 movel #_my_vbl,d0
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87
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88 /* Stop interrupts */
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89
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90 movew #0x2700,sr
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91
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92 /* Read vbl_queue pointer */
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93 movel _vbl_queue.w,a1
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94
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95 /* Search where we are */
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96 moveq #7,d1
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97 bcl2_search_place:
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98 cmpl (a1),d0
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99 bnes next_place
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100 clrl (a1)
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101 moveq #0,d1
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102 next_place:
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103 addql #4,a1
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104 dbra d1,bcl2_search_place
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105
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106 /* Restart interrupts */
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107 movew #0x2300,sr
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108 badvector:
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109 rts
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110
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111 /*--- Our vbl ---*/
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112
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113 _my_vbl:
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114 /* Verify if this is not already running */
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115
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116 tstw vbl_mutex
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117 bnes vbl_end
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118 notw vbl_mutex
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119
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120 moveml d0-d7/a0-a6,sp@-
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121 movel my_vector,a0
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122 jsr a0@
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123 moveml sp@+,d0-d7/a0-a6
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124
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125 clrw vbl_mutex
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126 vbl_end:
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127 rts
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128
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129 .data
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130 .even
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131 .comm vbl_mutex,2*1
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132 .even
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133 .comm my_vector,4*1