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annotate src/timer/mint/SDL_vbltimer.S @ 2052:eb5e61b72da3

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Also save/restore fpu register in vbl interrupt
author Patrice Mandin <patmandin@gmail.com>
date Sat, 21 Oct 2006 18:56:35 +0000
parents c9b51268668f
children b42abf0a50bc
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 .globl _SDL_MintAudio_hasfpu
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37
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38 /*--- Vector installer ---*/
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39
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40 _SDL_AtariVblInstall:
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41 movel sp@(4),my_vector
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42 lea _my_vbl,a0
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43
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44 clrw vbl_mutex
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45
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46 /* Stop interrupts */
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47
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48 movew #0x2700,sr
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49
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50 /* Read vbl_queue pointer */
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51 movel _vbl_queue.w,a1
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52
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53 /* Search a free place */
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54 moveq #7,d0
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55 bcl_search_place:
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56 movel (a1),d1
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57 beqs place_found
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58 addql #4,a1
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59 dbra d0,bcl_search_place
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60
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61 /* Not found */
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62 moveq #1,d0
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63 bras exit_vbl_queue
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64
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65 /* Then install ourselves */
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66 place_found:
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67 movel a0,(a1)
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68 moveq #0,d0
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69
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70 exit_vbl_queue:
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71 /* Restart interrupts */
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72 movew #0x2300,sr
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73
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74 rts
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75
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76 /*--- Vector uninstaller ---*/
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77
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78 _SDL_AtariVblUninstall:
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79 movel sp@(4),d0
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80 cmpl my_vector,d0
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81 bnes badvector
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82
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83 movel #_my_vbl,d0
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84
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85 /* Stop interrupts */
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86
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87 movew #0x2700,sr
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88
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89 /* Read vbl_queue pointer */
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90 movel _vbl_queue.w,a1
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91
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92 /* Search where we are */
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93 moveq #7,d1
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94 bcl2_search_place:
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95 cmpl (a1),d0
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96 bnes next_place
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97 clrl (a1)
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98 moveq #0,d1
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99 next_place:
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100 addql #4,a1
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101 dbra d1,bcl2_search_place
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102
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103 /* Restart interrupts */
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104 movew #0x2300,sr
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105 badvector:
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106 rts
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107
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108 /*--- Our vbl ---*/
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109
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110 _my_vbl:
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111 /* Verify if this is not already running */
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112
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113 tstw vbl_mutex
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114 bnes vbl_end
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115 notw vbl_mutex
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116
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117 moveml d0-d7/a0-a6,sp@-
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118
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119 /* Save FPU if needed */
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120 tstw _SDL_MintAudio_hasfpu
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121 beqs SDL_AtariVbl_nofpu1
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122 .chip 68060
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123 fsave sp@-
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124 fmoveml fpcr/fpsr/fpiar,sp@-
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125 fmovemx fp0-fp7,sp@-
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126 .chip 68000
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127 SDL_AtariVbl_nofpu1:
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128
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129 movel my_vector,a0
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130 jsr a0@
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131
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132 /* Restore FPU if needed */
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133 tstw _SDL_MintAudio_hasfpu
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134 beqs SDL_AtariVbl_Xbios_nofpu2
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135 .chip 68060
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136 fmovemx sp@+,fp0-fp7
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137 fmoveml sp@+,fpcr/fpsr/fpiar
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138 frestore sp@+
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139 .chip 68000
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140 SDL_AtariVbl_Xbios_nofpu2:
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141
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142 moveml sp@+,d0-d7/a0-a6
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143
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144 clrw vbl_mutex
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145 vbl_end:
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146 rts
c5010ab8ba35 Added initial support for Atari (thanks Patrice!)
Sam Lantinga <slouken@libsdl.org>
parents:
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147
c5010ab8ba35 Added initial support for Atari (thanks Patrice!)
Sam Lantinga <slouken@libsdl.org>
parents:
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148 .data
c5010ab8ba35 Added initial support for Atari (thanks Patrice!)
Sam Lantinga <slouken@libsdl.org>
parents:
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149 .even
c5010ab8ba35 Added initial support for Atari (thanks Patrice!)
Sam Lantinga <slouken@libsdl.org>
parents:
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150 .comm vbl_mutex,2*1
c5010ab8ba35 Added initial support for Atari (thanks Patrice!)
Sam Lantinga <slouken@libsdl.org>
parents:
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151 .even
c5010ab8ba35 Added initial support for Atari (thanks Patrice!)
Sam Lantinga <slouken@libsdl.org>
parents:
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152 .comm my_vector,4*1