annotate src/audio/mint/SDL_mintaudio_it.S @ 662:66c02f83f5bf

Date: Sun, 27 Jul 2003 22:37:59 +0200 From: Max Horn Subject: SDL whitespace patch this patch is lowest priority: it only contains indention fixes. In some places, instead of tabs, whitespaces where used for indention. But of course that only "looks good" if you use the exact same tab width as the author of those files. I tried to replace such cases with tabs for a more uniform indention. I only did that for a few files. So, no code changes in this, only whitespaces transformed.
author Sam Lantinga <slouken@libsdl.org>
date Mon, 28 Jul 2003 01:47:55 +0000
parents 594422ab8f9f
children c4803992e09c
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
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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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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