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annotate src/audio/mint/SDL_mintaudio_it.S @ 704:c4803992e09c

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Small bugfixes
author Patrice Mandin <patmandin@gmail.com>
date Sat, 30 Aug 2003 20:00:11 +0000
parents 594422ab8f9f
children 185acc07127a
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 eorw #1,_SDL_MintAudio_numbuf
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66
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67 moveml d0-d2/a0-a2,sp@-
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68
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69 /* Callback */
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70 jsr _SDL_MintAudio_Callback
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71
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72 /* Set new buffer */
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73
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74 moveq #0,d0
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75 movel _SDL_MintAudio_audiosize,d1
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76
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77 movew _SDL_MintAudio_numbuf,d0
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78 lsll #2,d0
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79 lea _SDL_MintAudio_audiobuf,a0
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80 movel a0@(d0:l),a1
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81
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82 lea a1@(d1:l),a2
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84 movel a2,sp@-
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85 movel a1,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 eorw #1,_SDL_MintAudio_numbuf
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114
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115 moveml d0-d2/a0-a2,sp@-
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116
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117 /* Callback */
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118 jsr _SDL_MintAudio_Callback
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119
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120 /* Set new buffer */
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121
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122 moveq #0,d0
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123 movel _SDL_MintAudio_audiosize,d1
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124
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125 movew _SDL_MintAudio_numbuf,d0
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126 lsll #2,d0
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127 lea _SDL_MintAudio_audiobuf,a0
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128 movel a0@(d0:l),a1
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129
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130 lea a1@(d1:l),a2
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132 movel a2,sp@-
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133 movel a1,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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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 eorw #1,_SDL_MintAudio_numbuf
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162
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163 moveml d0-d1/a0-a1,sp@-
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164
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165 /* Callback */
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166 jsr _SDL_MintAudio_Callback
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167
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168 /* Set new buffer */
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169
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170 moveq #0,d0
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171
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172 movew _SDL_MintAudio_numbuf,d0
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173 lslw #2,d0
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174 lea _SDL_MintAudio_audiobuf,a0
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175 movel a0@(d0:w),d1
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176
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177 /* Modify DMA addresses */
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178 lea 0xffff8900:w,a0
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179
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180 moveb d1,a0@(0x07) /* Start address */
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181 rorl #8,d1
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182 moveb d1,a0@(0x05)
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183 rorl #8,d1
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184 moveb d1,a0@(0x03)
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185 swap d1
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186
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187 addl _SDL_MintAudio_audiosize,d1
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188
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189 moveb d1,a0@(0x13) /* End address */
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190 rorl #8,d1
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191 moveb d1,a0@(0x11)
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192 rorl #8,d1
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193 moveb d1,a0@(0x0f)
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194
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195 moveml sp@+,d0-d1/a0-a1
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196
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197 clrw _SDL_MintAudio_mutex
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198 SDL_MintAudio_Dma8End:
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199 rte
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200
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201 /*--- STFA interrupt vector ---*/
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202
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203 STFA_SOUND_START = 6
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204 STFA_SOUND_END = STFA_SOUND_START+8
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205
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206 _SDL_MintAudio_StfaInterrupt:
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207
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208 /* Reenable interrupts, so other interrupts can work */
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209 movew #0x2300,sr
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210
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211 /* Check if we are not already running */
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212 tstw _SDL_MintAudio_mutex
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213 bnes SDL_MintAudio_StfaEnd
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214 notw _SDL_MintAudio_mutex
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215
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216 /* Swap buffers */
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217 eorw #1,_SDL_MintAudio_numbuf
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218
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219 moveml d0-d1/a0-a1,sp@-
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220
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221 /* Callback */
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222 jsr _SDL_MintAudio_Callback
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223
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224 /* Set new buffer */
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225
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226 moveq #0,d0
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227 movel _SDL_MintAudio_stfa,a1
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228
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229 movew _SDL_MintAudio_numbuf,d0
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230 lslw #2,d0
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231 lea _SDL_MintAudio_audiobuf,a0
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232 movel a0@(d0:w),d1
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233
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234 /* Modify STFA replay buffers */
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235 movel d1,a1@(STFA_SOUND_START)
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236 addl _SDL_MintAudio_audiosize,d1
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237 movel d1,a1@(STFA_SOUND_END)
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238
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239 moveml sp@+,d0-d1/a0-a1
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240
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241 clrw _SDL_MintAudio_mutex
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242 SDL_MintAudio_StfaEnd:
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243 rte