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annotate src/audio/mint/SDL_mintaudiointerrupt.S @ 398:d219b0e02f5f

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Added Atari audio support (thanks Patrice!)
author Sam Lantinga <slouken@libsdl.org>
date Mon, 10 Jun 2002 20:42:53 +0000
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children 1338c24e30cb
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398
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1 /*
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2 * Audio interrupt routines
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3 *
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4 * Patrice Mandin
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5 */
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6
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7 .text
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8
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9 .globl _SDL_MintAudio_Callback
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10
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11 .globl _SDL_MintAudio_IntDma
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12 .globl _SDL_MintAudio_IntXbios
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13 .globl _SDL_MintAudio_IntGsxb
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14
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15 .globl _SDL_MintAudio_mutex
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16 .globl _SDL_MintAudio_audiobuf
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17 .globl _SDL_MintAudio_numbuf
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18 .globl _SDL_MintAudio_audiosize
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19
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20 /*
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21 How it works:
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22 - Audio is playing buffer #0 (resp. #1)
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23 - We must calculate a sample in buffer #1 (resp. #0)
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24 so we first call the callback to do it
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25 - Then we swap the buffers
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26 */
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27
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28 /*--- DMA 8 bits interrupt vector ---*/
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29
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30 .text
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31 _SDL_MintAudio_IntDma:
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32
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33 /* Check if we are not already running */
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34 tstw _SDL_MintAudio_mutex
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35 bnes intdma_end
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36 notw _SDL_MintAudio_mutex
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37
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38 /* Reenable interrupts */
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39 movew #0x2300,sr
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40
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41 /* Swap buffers */
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42 moveml d0-d1/a0-a1,sp@-
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43
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44 movel _SDL_MintAudio_numbuf,d0
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45 movel _SDL_MintAudio_audiobuf,d1
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46 eorl #1,d0
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47 beqs intdma_buffer0
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48 movel _SDL_MintAudio_audiobuf+4,d1
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49 intdma_buffer0:
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50 movel d0,_SDL_MintAudio_numbuf
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51
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52 /* Callback */
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53 movel d1,sp@-
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54 jsr _SDL_MintAudio_Callback
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55 movel sp@+,d1
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56
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57 /* Modify DMA addresses */
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58 lea 0xffff8900:w,a0
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59
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60 moveb d1,a0@(0x07) /* Start address */
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61 rorl #8,d1
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62 moveb d1,a0@(0x05)
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63 rorl #8,d1
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64 moveb d1,a0@(0x03)
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65 swap d1
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66
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67 addl _SDL_MintAudio_audiosize,d1
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68
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69 moveb d1,a0@(0x13) /* End address */
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70 rorl #8,d1
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71 moveb d1,a0@(0x11)
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72 rorl #8,d1
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73 moveb d1,a0@(0x0f)
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74
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75 moveml sp@+,d0-d1/a0-a1
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76
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77 clrw _SDL_MintAudio_mutex
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78 intdma_end:
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79 bclr #5,0xfffffa0f:w
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80 rte
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81
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82 /*--- Xbios interrupt vector ---*/
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83
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84 .text
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85 _SDL_MintAudio_IntXbios:
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86
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87 /* Check if we are not already running */
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88 tstw _SDL_MintAudio_mutex
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89 bnes intxbios_end
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90 notw _SDL_MintAudio_mutex
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91
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92 /* Reenable interrupts */
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93 movew #0x2300,sr
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94
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95 /* Swap buffers */
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96 moveml d0-d2/a0-a2,sp@-
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97
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98 movel _SDL_MintAudio_numbuf,d0
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99 movel _SDL_MintAudio_audiobuf,a0
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100 eorl #1,d0
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101 beqs intxbios_buffer0
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102 movel _SDL_MintAudio_audiobuf+4,a0
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103 intxbios_buffer0:
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104 movel d0,_SDL_MintAudio_numbuf
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105
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106 /* Callback */
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107 moveml a0,sp@-
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108 jsr _SDL_MintAudio_Callback
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109 moveml sp@+,a0
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110
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111 /* Setbuffer xbios function */
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112 movel _SDL_MintAudio_audiosize,d1
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113 lea a0@(0,d1:l),a1
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114
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115 movel a1,sp@-
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116 movel a0,sp@-
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117 clrw sp@-
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118 movew #131,sp@-
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119 trap #14
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120 lea sp@(12),sp
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121
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122 moveml sp@+,d0-d2/a0-a2
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123
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124 clrw _SDL_MintAudio_mutex
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125 intxbios_end:
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126 bclr #5,0xfffffa0f:w
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127 rte
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128
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129 /*--- GSXB interrupt vector ---*/
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130
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131 .text
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132 _SDL_MintAudio_IntGsxb:
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133
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134 /* Check if we are not already running */
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135 tstw _SDL_MintAudio_mutex
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136 bnes intgsxb_end
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137 notw _SDL_MintAudio_mutex
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138
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139 /* Swap buffers */
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140 moveml d0-d2/a0-a2,sp@-
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141
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142 movel _SDL_MintAudio_numbuf,d0
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143 movel _SDL_MintAudio_audiobuf,a0
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144 eorl #1,d0
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145 beqs intgsxb_buffer0
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146 movel _SDL_MintAudio_audiobuf+4,a0
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147 intgsxb_buffer0:
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148 movel d0,_SDL_MintAudio_numbuf
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149
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150 /* Callback */
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151 moveml a0,sp@-
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152 jsr _SDL_MintAudio_Callback
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153 moveml sp@+,a0
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154
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155 /* Setbuffer xbios function */
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156 movel _SDL_MintAudio_audiosize,d1
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157 lea a0@(0,d1:l),a1
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158
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159 movel a1,sp@-
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160 movel a0,sp@-
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161 clrw sp@-
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162 movew #131,sp@-
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163 trap #14
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164 lea sp@(12),sp
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165
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166 moveml sp@+,d0-d2/a0-a2
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167
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168 clrw _SDL_MintAudio_mutex
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169 intgsxb_end:
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170 rts
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171
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172 /*--- Common variables ---*/
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173
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174 .data
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175 .even
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176 .comm _SDL_MintAudio_mutex,4
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177 .even
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178 .comm _SDL_MintAudio_audiobuf,8
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179 .even
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180 .comm _SDL_MintAudio_numbuf,4
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181 .even
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182 .comm _SDL_MintAudio_audiosize,4
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183