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annotate src/video/ataricommon/SDL_xbiosinterrupt.S @ 4034:4ea82f5e7e2c SDL-1.2

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Backported the NAS detection from SDL 1.3, replacing the broken NetBSD patch
author Sam Lantinga <slouken@libsdl.org>
date Tue, 10 Jul 2007 14:16:44 +0000
parents be01e0b82dca
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 * XBIOS mouse & joystick vectors
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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 .text
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30
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31 .globl _SDL_AtariXbios_Install
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32 .globl _SDL_AtariXbios_Restore
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33 .globl _SDL_AtariXbios_MouseVector
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34 .globl _SDL_AtariXbios_JoystickVector
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35
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36 .globl _SDL_AtariXbios_mouselock
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37 .globl _SDL_AtariXbios_mouseb
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38 .globl _SDL_AtariXbios_mousex
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39 .globl _SDL_AtariXbios_mousey
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40 .globl _SDL_AtariXbios_joystick
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41
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42 /*--- Vector installer ---*/
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43
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44 _SDL_AtariXbios_Install:
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45 movel sp@(4),a0
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46
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47 /* Stop interrupts */
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48
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49 movew #0x2700,sr
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50
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51 /* Save old mouse vector, set our routine */
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52
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53 clrl oldmousevector
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54 movel sp@(8),d0
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55 beqs no_new_mouse_vector
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56 movel a0@(16),oldmousevector
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57 movel d0,a0@(16)
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58 no_new_mouse_vector:
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59
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60 /* Save old joystick vector, set our routine */
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61
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62 clrl oldjoystickvector
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63 movel sp@(12),d0
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64 beqs no_new_joystick_vector
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65 movel a0@(24),oldjoystickvector
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66 movel d0,a0@(24)
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67 no_new_joystick_vector:
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68
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69 /* Restart interrupts */
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70
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71 movew #0x2300,sr
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72
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73 rts
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74
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75 /*--- Vector restorer ---*/
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76
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77 _SDL_AtariXbios_Restore:
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78 movel sp@(4),a0
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79
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80 /* Stop interrupts */
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81
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82 movew #0x2700,sr
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83
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84 /* Restore mouse vector */
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85
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86 movel oldmousevector,d0
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87 beqs no_restore_mouse
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88 movel d0,a0@(16)
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89 no_restore_mouse:
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90
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91 /* Restore joystick vector */
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92
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93 movel oldjoystickvector,d0
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94 beqs no_restore_joystick
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95 movel d0,a0@(24)
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96 no_restore_joystick:
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97
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98 /* Restart interrupts */
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99
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100 movew #0x2300,sr
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101
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102 rts
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103
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104 /*--- Our mouse vector ---*/
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105
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106 .text
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107 .even
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108 .ascii "XBRA"
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109 .ascii "LSDL"
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110 .comm oldmousevector,4*1
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111 _SDL_AtariXbios_MouseVector:
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112 movel d0,sp@-
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113
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114 /* Mouse buttons */
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115 moveb (a0),d0
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116 andw #3,d0
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117 movew d0,_SDL_AtariXbios_mouseb
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118
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119 /* X movement */
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120 moveb a0@(1),d0
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121 extw d0
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122 addw d0,_SDL_AtariXbios_mousex
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123
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124 /* Y movement */
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125 moveb a0@(2),d0
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126 extw d0
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127 addw d0,_SDL_AtariXbios_mousey
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128
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129 /* Lock mouse position ? */
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130 tstw _SDL_AtariXbios_mouselock
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131 beq.s no_mouse_lock
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132 clrb a0@(1)
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133 clrb a0@(2)
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134 no_mouse_lock:
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135
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136 /* Jump through old vector */
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137 movel sp@+,d0
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138
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139 movel oldmousevector,sp@-
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140 rts
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141
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142 .data
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143 .even
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144 .comm _SDL_AtariXbios_mouselock,2*1
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145 .comm _SDL_AtariXbios_mousex,2*1
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146 .comm _SDL_AtariXbios_mousey,2*1
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147 .comm _SDL_AtariXbios_mouseb,2*1
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148
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149 /*--- Our joystick vector ---*/
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150
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151 .text
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152 .even
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153 .ascii "XBRA"
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154 .ascii "LSDL"
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155 .comm oldjoystickvector,4*1
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156 _SDL_AtariXbios_JoystickVector:
987
d9f3b5bb7870 Do not use registers when not necessary
Patrice Mandin <patmandin@gmail.com>
parents: 820
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157 movel d0,sp@-
305
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158
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159 /* New joystick state */
1063
0fb50bfaea7f Used wrong offset in joystick packet
Patrice Mandin <patmandin@gmail.com>
parents: 987
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160 moveb a0@(2),d0
305
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161 andw #0x8f,d0
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162 movew d0,_SDL_AtariXbios_joystick
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163
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164 /* Jump through old vector */
987
d9f3b5bb7870 Do not use registers when not necessary
Patrice Mandin <patmandin@gmail.com>
parents: 820
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165 movel sp@+,d0
305
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166
987
d9f3b5bb7870 Do not use registers when not necessary
Patrice Mandin <patmandin@gmail.com>
parents: 820
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167 movel oldjoystickvector,sp@-
305
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168 rts
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169
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170 .data
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171 .even
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172 .comm _SDL_AtariXbios_joystick,2*1