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annotate src/audio/mint/SDL_mintaudio_it.S @ 3848:4de14c915f4c SDL-1.2

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Updated the snapshot build target to reflect the new source location
author Sam Lantinga <slouken@libsdl.org>
date Mon, 10 Jul 2006 21:23:11 +0000
parents c83fa1c650dd
children d48ead2d2ba5 ea2a327b92d7
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, 1998, 1999, 2000, 2001, 2002 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 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 /*
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24 Audio interrupts
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25
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26 Patrice Mandin, Didier Méquignon
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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_MintAudio_Callback
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32
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33 .globl _SDL_MintAudio_XbiosInterrupt
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34 .globl _SDL_MintAudio_XbiosInterruptMeasureClock
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35 .globl _SDL_MintAudio_Dma8Interrupt
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36 .globl _SDL_MintAudio_StfaInterrupt
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37
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38 .globl _SDL_MintAudio_mutex
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39 .globl _SDL_MintAudio_audiobuf
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40 .globl _SDL_MintAudio_numbuf
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41 .globl _SDL_MintAudio_audiosize
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42 .globl _SDL_MintAudio_clocktics
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43
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44 .globl _SDL_MintAudio_stfa
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45
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46 /*
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47 How it works:
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48 - Audio is playing buffer #0 (resp. #1)
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49 - We must calculate a sample in buffer #1 (resp. #0)
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50 so we first call the callback to do it
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51 - Then we swap the buffers
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52 */
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53
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54 #define savptr 0x4a2
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55 #define savamt 0x46
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56
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57 /*--- Xbios interrupt vector to measure Falcon external clock ---*/
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58
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59 _SDL_MintAudio_XbiosInterruptMeasureClock: /* 1 mS */
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60
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61 btst #0,0xFFFF8901:w /* state DMA sound */
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62 beqs SDL_MintAudio_EndIntMeasure
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63 addql #1,_SDL_MintAudio_clocktics
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64 SDL_MintAudio_EndIntMeasure:
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65 bclr #5,0xFFFFFA0F:w /* Clear service bit */
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66 rte
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67
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68 /*--- Xbios interrupt vector ---*/
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69
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70 _SDL_MintAudio_XbiosInterrupt:
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71
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72 /* Reenable interrupts, so other interrupts can work */
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73 movew #0x2300,sr
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74
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75 /* Clear service bit, so other MFP interrupts can work */
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76 bclr #5,0xfffffa0f:w
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77
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78 /* Check if we are not already running */
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79 tstw _SDL_MintAudio_mutex
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80 bnes SDL_MintAudio_XbiosEnd
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81 notw _SDL_MintAudio_mutex
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82
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83 /* Swap buffers */
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84 eorw #1,_SDL_MintAudio_numbuf
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85
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86 moveml d0-d7/a0-a6,sp@-
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87
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88 /* Callback */
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89 jsr _SDL_MintAudio_Callback
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90
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91 /* Reserve space for registers */
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92 subl #savamt,savptr
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93
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94 /* Set new buffer */
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95
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96 moveq #0,d0
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97 movel _SDL_MintAudio_audiosize,d1
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98
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99 movew _SDL_MintAudio_numbuf,d0
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100 lsll #2,d0
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101 lea _SDL_MintAudio_audiobuf,a0
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102 movel a0@(d0:l),a1
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103
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104 lea a1@(d1:l),a2
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105
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106 movel a2,sp@-
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107 movel a1,sp@-
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108 clrw sp@-
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109 movew #131,sp@-
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110 trap #14
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111 lea sp@(12),sp
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112
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113 /* Restore registers space */
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114 addl #savamt,savptr
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115
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116 moveml sp@+,d0-d7/a0-a6
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117
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118 clrw _SDL_MintAudio_mutex
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119 SDL_MintAudio_XbiosEnd:
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120 rte
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121
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122 /*--- DMA 8 bits interrupt vector ---*/
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123
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124 _SDL_MintAudio_Dma8Interrupt:
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125
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126 /* Reenable interrupts, so other interrupts can work */
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127 movew #0x2300,sr
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128
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129 /* Clear service bit, so other MFP interrupts can work */
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130 bclr #5,0xfffffa0f:w
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131
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132 /* Check if we are not already running */
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133 tstw _SDL_MintAudio_mutex
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134 bnes SDL_MintAudio_Dma8End
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135 notw _SDL_MintAudio_mutex
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136
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137 /* Swap buffers */
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138 eorw #1,_SDL_MintAudio_numbuf
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139
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140 moveml d0-d7/a0-a6,sp@-
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141
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142 /* Callback */
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143 jsr _SDL_MintAudio_Callback
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144
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145 /* Set new buffer */
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146
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147 moveq #0,d0
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148
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149 movew _SDL_MintAudio_numbuf,d0
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150 lslw #2,d0
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151 lea _SDL_MintAudio_audiobuf,a0
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152 movel a0@(d0:w),d1
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153
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154 /* Modify DMA addresses */
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155 lea 0xffff8900:w,a0
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156
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157 moveb d1,a0@(0x07) /* Start address */
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158 rorl #8,d1
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159 moveb d1,a0@(0x05)
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160 rorl #8,d1
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161 moveb d1,a0@(0x03)
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162 swap d1
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163
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164 addl _SDL_MintAudio_audiosize,d1
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165
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166 moveb d1,a0@(0x13) /* End address */
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167 rorl #8,d1
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168 moveb d1,a0@(0x11)
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169 rorl #8,d1
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170 moveb d1,a0@(0x0f)
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171
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172 moveml sp@+,d0-d7/a0-a6
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173
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174 clrw _SDL_MintAudio_mutex
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175 SDL_MintAudio_Dma8End:
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176 rte
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177
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178 /*--- STFA interrupt vector ---*/
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179
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180 STFA_SOUND_START = 6
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181 STFA_SOUND_END = STFA_SOUND_START+8
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182
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183 _SDL_MintAudio_StfaInterrupt:
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184
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185 /* Reenable interrupts, so other interrupts can work */
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186 movew #0x2300,sr
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187
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188 /* Check if we are not already running */
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189 tstw _SDL_MintAudio_mutex
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190 bnes SDL_MintAudio_StfaEnd
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191 notw _SDL_MintAudio_mutex
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192
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193 /* Swap buffers */
704
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194 eorw #1,_SDL_MintAudio_numbuf
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195
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196 moveml d0-d7/a0-a6,sp@-
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197
704
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198 /* Callback */
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199 jsr _SDL_MintAudio_Callback
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200
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201 /* Set new buffer */
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202
704
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203 moveq #0,d0
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204 movel _SDL_MintAudio_stfa,a1
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205
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206 movew _SDL_MintAudio_numbuf,d0
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207 lslw #2,d0
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208 lea _SDL_MintAudio_audiobuf,a0
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209 movel a0@(d0:w),d1
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210
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211 /* Modify STFA replay buffers */
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212 movel d1,a1@(STFA_SOUND_START)
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213 addl _SDL_MintAudio_audiosize,d1
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214 movel d1,a1@(STFA_SOUND_END)
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215
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216 moveml sp@+,d0-d7/a0-a6
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217
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218 clrw _SDL_MintAudio_mutex
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219 SDL_MintAudio_StfaEnd:
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220 rte