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annotate src/audio/mint/SDL_mintaudiointerrupt.S @ 543:522e5202014d

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author Sam Lantinga <slouken@libsdl.org>
date Sun, 17 Nov 2002 18:59:10 +0000
parents 1338c24e30cb
children
rev   line source
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 /* Reenable interrupts, so other interrupts can work */
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34 movew #0x2300,sr
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35
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36 /* Clear service bit, so other MFP interrupts can work */
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37 bclr #5,0xfffffa0f:w
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38
398
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39 /* Check if we are not already running */
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40 tstw _SDL_MintAudio_mutex
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41 bnes intdma_end
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42 notw _SDL_MintAudio_mutex
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43
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44 /* Swap buffers */
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45 moveml d0-d1/a0-a1,sp@-
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46
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47 movel _SDL_MintAudio_numbuf,d0
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48 movel _SDL_MintAudio_audiobuf,d1
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49 eorl #1,d0
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50 beqs intdma_buffer0
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51 movel _SDL_MintAudio_audiobuf+4,d1
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52 intdma_buffer0:
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53 movel d0,_SDL_MintAudio_numbuf
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54
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55 /* Callback */
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56 movel d1,sp@-
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57 jsr _SDL_MintAudio_Callback
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58 movel sp@+,d1
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59
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60 /* Modify DMA addresses */
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61 lea 0xffff8900:w,a0
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62
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63 moveb d1,a0@(0x07) /* Start address */
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64 rorl #8,d1
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65 moveb d1,a0@(0x05)
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66 rorl #8,d1
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67 moveb d1,a0@(0x03)
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68 swap d1
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69
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70 addl _SDL_MintAudio_audiosize,d1
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71
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72 moveb d1,a0@(0x13) /* End address */
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73 rorl #8,d1
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74 moveb d1,a0@(0x11)
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75 rorl #8,d1
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76 moveb d1,a0@(0x0f)
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77
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78 moveml sp@+,d0-d1/a0-a1
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79
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80 clrw _SDL_MintAudio_mutex
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81 intdma_end:
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82 rte
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83
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84 /*--- Xbios interrupt vector ---*/
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85
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86 .text
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87 _SDL_MintAudio_IntXbios:
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88
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89 /* Reenable interrupts, so other interrupts can work */
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90 movew #0x2300,sr
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91
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92 /* Clear service bit, so other MFP interrupts can work */
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93 bclr #5,0xfffffa0f:w
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94
398
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95 /* Check if we are not already running */
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96 tstw _SDL_MintAudio_mutex
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97 bnes intxbios_end
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98 notw _SDL_MintAudio_mutex
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99
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100 /* Swap buffers */
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101 moveml d0-d2/a0-a2,sp@-
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102
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103 movel _SDL_MintAudio_numbuf,d0
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104 movel _SDL_MintAudio_audiobuf,a0
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105 eorl #1,d0
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106 beqs intxbios_buffer0
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107 movel _SDL_MintAudio_audiobuf+4,a0
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108 intxbios_buffer0:
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109 movel d0,_SDL_MintAudio_numbuf
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110
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111 /* Callback */
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112 moveml a0,sp@-
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113 jsr _SDL_MintAudio_Callback
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114 moveml sp@+,a0
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115
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116 /* Setbuffer xbios function */
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117 movel _SDL_MintAudio_audiosize,d1
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118 lea a0@(0,d1:l),a1
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119
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120 movel a1,sp@-
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121 movel a0,sp@-
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122 clrw sp@-
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123 movew #131,sp@-
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124 trap #14
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125 lea sp@(12),sp
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126
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127 moveml sp@+,d0-d2/a0-a2
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128
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129 clrw _SDL_MintAudio_mutex
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130 intxbios_end:
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131 rte
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132
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133 /*--- GSXB interrupt vector ---*/
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134
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135 .text
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136 _SDL_MintAudio_IntGsxb:
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137
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138 /* Check if we are not already running */
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139 tstw _SDL_MintAudio_mutex
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140 bnes intgsxb_end
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141 notw _SDL_MintAudio_mutex
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142
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143 /* Swap buffers */
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144 moveml d0-d2/a0-a2,sp@-
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145
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146 movel _SDL_MintAudio_numbuf,d0
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147 movel _SDL_MintAudio_audiobuf,a0
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148 eorl #1,d0
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149 beqs intgsxb_buffer0
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150 movel _SDL_MintAudio_audiobuf+4,a0
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151 intgsxb_buffer0:
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152 movel d0,_SDL_MintAudio_numbuf
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153
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154 /* Callback */
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155 moveml a0,sp@-
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156 jsr _SDL_MintAudio_Callback
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157 moveml sp@+,a0
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158
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159 /* Setbuffer xbios function */
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160 movel _SDL_MintAudio_audiosize,d1
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161 lea a0@(0,d1:l),a1
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162
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163 movel a1,sp@-
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164 movel a0,sp@-
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165 clrw sp@-
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166 movew #131,sp@-
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167 trap #14
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168 lea sp@(12),sp
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169
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170 moveml sp@+,d0-d2/a0-a2
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171
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172 clrw _SDL_MintAudio_mutex
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173 intgsxb_end:
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174 rts
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175
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176 /*--- Common variables ---*/
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177
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178 .data
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179 .even
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180 .comm _SDL_MintAudio_mutex,4
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181 .even
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182 .comm _SDL_MintAudio_audiobuf,8
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183 .even
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184 .comm _SDL_MintAudio_numbuf,4
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185 .even
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186 .comm _SDL_MintAudio_audiosize,4
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187