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annotate src/timer/mint/SDL_vbltimer.S @ 2184:8f8516e79a13

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Merged Ryan's patch from revision 3238 in SDL 1.2
author Sam Lantinga <slouken@libsdl.org>
date Thu, 12 Jul 2007 08:07:30 +0000
parents b42abf0a50bc
children 99210400e8b9
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 #define _hz_200 0x4ba
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31
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32 .text
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33
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34 .globl _SDL_AtariVblInstall
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35 .globl _SDL_AtariVblUninstall
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36
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37 .globl _SDL_MintAudio_hasfpu
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38
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39 /*--- Vector installer ---*/
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40
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41 _SDL_AtariVblInstall:
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42 movel sp@(4),my_vector
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43 lea _my_vbl,a0
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44
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45 clrw vbl_mutex
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46 movel _hz_200.w, _SDL_Atari_hz200
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47
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48 /* Stop interrupts */
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49
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50 movew #0x2700,sr
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51
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52 /* Read vbl_queue pointer */
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53 movel _vbl_queue.w,a1
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54
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55 /* Search a free place */
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56 moveq #7,d0
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57 bcl_search_place:
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58 movel (a1),d1
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59 beqs place_found
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60 addql #4,a1
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61 dbra d0,bcl_search_place
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62
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63 /* Not found */
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64 moveq #1,d0
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65 bras exit_vbl_queue
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66
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67 /* Then install ourselves */
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68 place_found:
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69 movel a0,(a1)
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70 moveq #0,d0
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71
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72 exit_vbl_queue:
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73 /* Restart interrupts */
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74 movew #0x2300,sr
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75
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76 rts
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77
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78 /*--- Vector uninstaller ---*/
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79
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80 _SDL_AtariVblUninstall:
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81 movel sp@(4),d0
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82 cmpl my_vector,d0
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83 bnes badvector
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84
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85 movel #_my_vbl,d0
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86
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87 /* Stop interrupts */
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88
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89 movew #0x2700,sr
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90
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91 /* Read vbl_queue pointer */
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92 movel _vbl_queue.w,a1
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93
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94 /* Search where we are */
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95 moveq #7,d1
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96 bcl2_search_place:
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97 cmpl (a1),d0
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98 bnes next_place
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99 clrl (a1)
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100 moveq #0,d1
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101 next_place:
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102 addql #4,a1
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103 dbra d1,bcl2_search_place
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104
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105 /* Restart interrupts */
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106 movew #0x2300,sr
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107 badvector:
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108 rts
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109
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110 /*--- Our vbl ---*/
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111
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112 _my_vbl:
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113 /* Update _hz_200 */
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114 movel _hz_200.w, _SDL_Atari_hz200
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115
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116 /* Verify if this is not already running */
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117
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118 tstw vbl_mutex
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119 bnes vbl_end
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120 notw vbl_mutex
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121
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122 moveml d0-d7/a0-a6,sp@-
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123
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124 /* Save FPU if needed */
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125 tstw _SDL_MintAudio_hasfpu
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126 beqs SDL_AtariVbl_nofpu1
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127 .chip 68060
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128 fsave sp@-
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129 fmoveml fpcr/fpsr/fpiar,sp@-
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130 fmovemx fp0-fp7,sp@-
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131 .chip 68000
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132 SDL_AtariVbl_nofpu1:
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133
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134 movel my_vector,a0
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135 jsr a0@
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136
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137 /* Restore FPU if needed */
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138 tstw _SDL_MintAudio_hasfpu
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139 beqs SDL_AtariVbl_Xbios_nofpu2
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140 .chip 68060
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141 fmovemx sp@+,fp0-fp7
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142 fmoveml sp@+,fpcr/fpsr/fpiar
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143 frestore sp@+
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144 .chip 68000
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145 SDL_AtariVbl_Xbios_nofpu2:
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146
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147 moveml sp@+,d0-d7/a0-a6
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148
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149 clrw vbl_mutex
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150 vbl_end:
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151 rts
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152
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153 .data
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154 .even
2116
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155 .comm _SDL_Atari_hz200,4*1
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156 .even
281
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157 .comm vbl_mutex,2*1
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158 .even
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159 .comm my_vector,4*1