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annotate src/audio/mint/SDL_mintaudio_it.S @ 644:594422ab8f9f

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Atari MiNT: added more audio drivers
author Patrice Mandin <patmandin@gmail.com>
date Mon, 07 Jul 2003 19:16:03 +0000
parents
children c4803992e09c
rev   line source
644
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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
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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_GsxbInterrupt
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34 .globl _SDL_MintAudio_EmptyGsxbInterrupt
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35 .globl _SDL_MintAudio_XbiosInterrupt
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36 .globl _SDL_MintAudio_Dma8Interrupt
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37 .globl _SDL_MintAudio_StfaInterrupt
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38
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39 .globl _SDL_MintAudio_mutex
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40 .globl _SDL_MintAudio_audiobuf
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41 .globl _SDL_MintAudio_numbuf
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42 .globl _SDL_MintAudio_audiosize
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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 /*--- GSXB interrupt vector ---*/
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55
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56 .text
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57 _SDL_MintAudio_GsxbInterrupt:
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58
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59 /* Check if we are not already running */
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60 tstw _SDL_MintAudio_mutex
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61 bnes _SDL_MintAudio_EmptyGsxbInterrupt
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62 notw _SDL_MintAudio_mutex
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63
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64 /* Swap buffers */
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65 moveml d0-d2/a0-a2,sp@-
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66
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67 movel _SDL_MintAudio_numbuf,d0
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68 movel _SDL_MintAudio_audiobuf,a0
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69 eorl #1,d0
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70 beqs SDL_MintAudio_GsxbBuffer0
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71 movel _SDL_MintAudio_audiobuf+4,a0
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72 SDL_MintAudio_GsxbBuffer0:
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73 movel d0,_SDL_MintAudio_numbuf
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74
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75 /* Callback */
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76 movel a0,sp@-
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77 jsr _SDL_MintAudio_Callback
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78 movel sp@+,a0
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79
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80 /* Setbuffer xbios function */
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81 movel _SDL_MintAudio_audiosize,d1
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82 lea a0@(0,d1:l),a1
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83
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84 movel a1,sp@-
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85 movel a0,sp@-
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86 clrw sp@-
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87 movew #131,sp@-
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88 trap #14
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89 lea sp@(12),sp
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90
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91 moveml sp@+,d0-d2/a0-a2
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92
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93 clrw _SDL_MintAudio_mutex
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94 _SDL_MintAudio_EmptyGsxbInterrupt:
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95 rts
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96
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97 /*--- Xbios interrupt vector ---*/
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98
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99 _SDL_MintAudio_XbiosInterrupt:
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100
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101 /* Reenable interrupts, so other interrupts can work */
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102 movew #0x2300,sr
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103
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104 /* Clear service bit, so other MFP interrupts can work */
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105 bclr #5,0xfffffa0f:w
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106
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107 /* Check if we are not already running */
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108 tstw _SDL_MintAudio_mutex
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109 bnes SDL_MintAudio_XbiosEnd
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110 notw _SDL_MintAudio_mutex
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111
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112 /* Swap buffers */
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113 moveml d0-d2/a0-a2,sp@-
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114
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115 movel _SDL_MintAudio_numbuf,d0
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116 movel _SDL_MintAudio_audiobuf,a0
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117 eorl #1,d0
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118 beqs SDL_MintAudio_XbiosBuffer0
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119 movel _SDL_MintAudio_audiobuf+4,a0
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120 SDL_MintAudio_XbiosBuffer0:
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121 movel d0,_SDL_MintAudio_numbuf
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122
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123 /* Callback */
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124 movel a0,sp@-
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125 jsr _SDL_MintAudio_Callback
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126 movel sp@+,a0
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127
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128 /* Setbuffer xbios function */
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129 movel _SDL_MintAudio_audiosize,d1
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130 lea a0@(0,d1:l),a1
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131
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132 movel a1,sp@-
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133 movel a0,sp@-
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134 clrw sp@-
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135 movew #131,sp@-
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136 trap #14
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137 lea sp@(12),sp
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138
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139 moveml sp@+,d0-d2/a0-a2
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140
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141 clrw _SDL_MintAudio_mutex
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142 SDL_MintAudio_XbiosEnd:
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143 rte
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144
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145 /*--- DMA 8 bits interrupt vector ---*/
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146
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147 _SDL_MintAudio_Dma8Interrupt:
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148
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149 /* Reenable interrupts, so other interrupts can work */
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150 movew #0x2300,sr
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151
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152 /* Clear service bit, so other MFP interrupts can work */
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153 bclr #5,0xfffffa0f:w
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154
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155 /* Check if we are not already running */
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156 tstw _SDL_MintAudio_mutex
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157 bnes SDL_MintAudio_Dma8End
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158 notw _SDL_MintAudio_mutex
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159
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160 /* Swap buffers */
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161 moveml d0-d1/a0-a1,sp@-
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162
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163 movel _SDL_MintAudio_numbuf,d0
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164 movel _SDL_MintAudio_audiobuf,d1
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165 eorl #1,d0
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166 beqs SDL_MintAudio_Dma8Buffer0
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167 movel _SDL_MintAudio_audiobuf+4,d1
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168 SDL_MintAudio_Dma8Buffer0:
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169 movel d0,_SDL_MintAudio_numbuf
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170
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171 /* Callback */
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172 movel d1,sp@-
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173 jsr _SDL_MintAudio_Callback
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174 movel sp@+,d1
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175
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176 /* Modify DMA addresses */
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177 lea 0xffff8900:w,a0
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178
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179 moveb d1,a0@(0x07) /* Start address */
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180 rorl #8,d1
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181 moveb d1,a0@(0x05)
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182 rorl #8,d1
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183 moveb d1,a0@(0x03)
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184 swap d1
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185
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186 addl _SDL_MintAudio_audiosize,d1
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187
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188 moveb d1,a0@(0x13) /* End address */
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189 rorl #8,d1
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190 moveb d1,a0@(0x11)
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191 rorl #8,d1
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192 moveb d1,a0@(0x0f)
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193
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194 moveml sp@+,d0-d1/a0-a1
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195
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196 clrw _SDL_MintAudio_mutex
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197 SDL_MintAudio_Dma8End:
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198 rte
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199
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200 /*--- STFA interrupt vector ---*/
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201
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202 STFA_SOUND_START = 6
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203 STFA_SOUND_END = STFA_SOUND_START+8
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204
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205 _SDL_MintAudio_StfaInterrupt:
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206
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207 /* Reenable interrupts, so other interrupts can work */
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208 movew #0x2300,sr
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209
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210 /* Check if we are not already running */
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211 tstw _SDL_MintAudio_mutex
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212 bnes SDL_MintAudio_StfaEnd
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213 notw _SDL_MintAudio_mutex
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214
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215 /* Swap buffers */
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216 moveml d0-d1/a0-a1,sp@-
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217
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218 movel _SDL_MintAudio_numbuf,d0
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219 movel _SDL_MintAudio_audiobuf,d1
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220 eorl #1,d0
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221 beqs SDL_MintAudio_StfaBuffer0
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222 movel _SDL_MintAudio_audiobuf+4,d1
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223 SDL_MintAudio_StfaBuffer0:
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224 movel d0,_SDL_MintAudio_numbuf
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225
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226 /* Callback */
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227 movel d1,sp@-
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228 jsr _SDL_MintAudio_Callback
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229 movel sp@+,d1
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230
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231 /* Modify STFA replay buffers */
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232 movel _SDL_MintAudio_stfa,a0
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233 movel d1,a0@(STFA_SOUND_START)
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234 addl _SDL_MintAudio_audiosize,d1
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235 movel d1,a0@(STFA_SOUND_END)
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236
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237 moveml sp@+,d0-d1/a0-a1
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238
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239 clrw _SDL_MintAudio_mutex
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240 SDL_MintAudio_StfaEnd:
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241 rte
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242