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annotate src/timer/mint/SDL_vbltimer.S @ 1312:c9b51268668f

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Updated copyright information and removed rcs id lines (problematic in branch merges) I batch edited these files, so please let me know if I've accidentally removed anybody's credit here.
author Sam Lantinga <slouken@libsdl.org>
date Wed, 01 Feb 2006 06:32:25 +0000
parents f6ffac90895c
children eb5e61b72da3
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2006 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 Lesser General Public
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7 License as published by the Free Software Foundation; either
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8 version 2.1 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 Lesser 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 Lesser General Public
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16 License along with this library; if not, write to the Free Software
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 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 /*
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24 * VBL queue routine
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25 *
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26 * Patrice Mandin
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27 */
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28
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29 #define _vbl_queue 0x456
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30
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31 .text
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32
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33 .globl _SDL_AtariVblInstall
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34 .globl _SDL_AtariVblUninstall
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35
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36 /*--- Vector installer ---*/
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37
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38 _SDL_AtariVblInstall:
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39 movel sp@(4),my_vector
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40 lea _my_vbl,a0
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41
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42 clrw vbl_mutex
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43
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44 /* Stop interrupts */
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45
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46 movew #0x2700,sr
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47
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48 /* Read vbl_queue pointer */
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49 movel _vbl_queue.w,a1
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50
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51 /* Search a free place */
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52 moveq #7,d0
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53 bcl_search_place:
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54 movel (a1),d1
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55 beqs place_found
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56 addql #4,a1
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57 dbra d0,bcl_search_place
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58
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59 /* Not found */
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60 moveq #1,d0
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61 bras exit_vbl_queue
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62
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63 /* Then install ourselves */
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64 place_found:
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65 movel a0,(a1)
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66 moveq #0,d0
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67
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68 exit_vbl_queue:
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69 /* Restart interrupts */
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70 movew #0x2300,sr
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71
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72 rts
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73
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74 /*--- Vector uninstaller ---*/
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75
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76 _SDL_AtariVblUninstall:
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77 movel sp@(4),d0
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78 cmpl my_vector,d0
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79 bnes badvector
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80
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81 movel #_my_vbl,d0
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82
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83 /* Stop interrupts */
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84
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85 movew #0x2700,sr
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86
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87 /* Read vbl_queue pointer */
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88 movel _vbl_queue.w,a1
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89
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90 /* Search where we are */
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91 moveq #7,d1
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92 bcl2_search_place:
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93 cmpl (a1),d0
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94 bnes next_place
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95 clrl (a1)
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96 moveq #0,d1
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97 next_place:
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98 addql #4,a1
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99 dbra d1,bcl2_search_place
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100
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101 /* Restart interrupts */
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102 movew #0x2300,sr
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103 badvector:
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104 rts
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105
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106 /*--- Our vbl ---*/
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107
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108 _my_vbl:
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109 /* Verify if this is not already running */
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110
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111 tstw vbl_mutex
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112 bnes vbl_end
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113 notw vbl_mutex
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114
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115 moveml d0-d7/a0-a6,sp@-
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116 movel my_vector,a0
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117 jsr a0@
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118 moveml sp@+,d0-d7/a0-a6
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119
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120 clrw vbl_mutex
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121 vbl_end:
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122 rts
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123
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124 .data
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125 .even
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126 .comm vbl_mutex,2*1
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127 .even
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128 .comm my_vector,4*1