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annotate src/audio/mint/SDL_mintaudiointerrupt.S @ 571:8e3ce997621c

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Date: Thu, 16 Jan 2003 13:48:31 +0200 From: "Mike Gorchak" Subject: All QNX patches whole patches concerning QNX. Almost all code has been rewritten by Julian and me. Added initial support for hw overlays in QNX and many many others fixes. P.S. This patches has been reviewed by Dave Rempel from QSSL and included in SDL 1.2.5 distribution, which coming on 3rd party CD for newest 6.2.1 version of QNX, which will be available soon.
author Sam Lantinga <slouken@libsdl.org>
date Mon, 20 Jan 2003 01:38:37 +0000
parents 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 /* 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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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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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