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annotate src/timer/mint/SDL_vbltimer.S @ 1143:71a2648acc75

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Replaced Mac OS X's C++ cdrom code with almost-direct translation to C. Sam requested this effort on the mailing list, apparently because of binary compatibility issues between 10.4 and earlier systems (or gcc4 and earlier compilers?). Works fine with SDL12/test/testcdrom.c, with this command line: ./testcdrom -status -list -play -sleep 5000 -pause -sleep 3000 -resume \ -sleep 5000 -stop -sleep 3000 -play -sleep 3000 -stop \ -sleep 3000 -eject Unix Makefiles work, XCode project still need updating for new filenames.
author Ryan C. Gordon <icculus@icculus.org>
date Thu, 22 Sep 2005 08:48:16 +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