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annotate src/audio/mint/SDL_mintaudio_it.S @ 4380:66aea42c3541 SDL-1.2

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Adapt audio interrupts for Coldfire
author Patrice Mandin <patmandin@gmail.com>
date Sat, 07 Nov 2009 20:45:45 +0000
parents a1b03ba2fcd0
children
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2009 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, Didier Méquignon
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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_XbiosInterrupt
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34 .globl _SDL_MintAudio_XbiosInterruptMeasureClock
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35 .globl _SDL_MintAudio_Dma8Interrupt
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36 .globl _SDL_MintAudio_StfaInterrupt
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37
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38 .globl _SDL_MintAudio_mutex
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39 .globl _SDL_MintAudio_audiobuf
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40 .globl _SDL_MintAudio_numbuf
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41 .globl _SDL_MintAudio_audiosize
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42 .globl _SDL_MintAudio_clocktics
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43 .globl _SDL_MintAudio_hasfpu
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44
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45 .globl _SDL_MintAudio_stfa
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46
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47 /*
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48 How it works:
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49 - Audio is playing buffer #0 (resp. #1)
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50 - We must calculate a sample in buffer #1 (resp. #0)
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51 so we first call the callback to do it
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52 - Then we swap the buffers
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53 */
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54
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55 #define savptr 0x4a2
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56 #define savamt 0x46
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57
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58 /*--- Save/restore FPU context ---*/
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59
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60 #if defined(__mcoldfire__)
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61
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62 #define SAVE_FPU_CONTEXT \
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63 lea sp@(-216),sp; \
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64 fsave sp@; \
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65 fmovel fpiar,sp@-; \
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66 lea sp@(-64),sp; \
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67 fmovemd fp0-fp7,sp@
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68
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69 #define RESTORE_FPU_CONTEXT \
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70 fmovemd sp@,fp0-fp7; \
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71 lea sp@(64),sp; \
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72 fmovel sp@+,fpiar; \
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73 frestore sp@; \
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74 lea sp@(216),sp
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75
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76 #else
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77
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78 #define SAVE_FPU_CONTEXT \
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79 .chip 68k/68881; \
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80 fsave sp@-; \
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81 fmoveml fpcr/fpsr/fpiar,sp@-; \
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82 fmovemx fp0-fp7,sp@-; \
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83 .chip 68k
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84
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85 #define RESTORE_FPU_CONTEXT \
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86 .chip 68k/68881; \
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87 fmovemx sp@+,fp0-fp7; \
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88 fmoveml sp@+,fpcr/fpsr/fpiar; \
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89 frestore sp@+; \
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90 .chip 68k
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91
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92 #endif
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93
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94 /*--- Xbios interrupt vector to measure Falcon external clock ---*/
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95
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96 _SDL_MintAudio_XbiosInterruptMeasureClock: /* 1 mS */
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97 #if defined(__mcoldfire__)
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98 movel d0,sp@-
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99
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100 moveql #0,d0
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101 btst d0,0xFFFF8901:w /* state DMA sound */
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102 #else
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103 btst #0,0xFFFF8901:w /* state DMA sound */
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104 #endif
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105 beqs SDL_MintAudio_EndIntMeasure
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106 addql #1,_SDL_MintAudio_clocktics
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107 SDL_MintAudio_EndIntMeasure:
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108 #if defined(__mcoldfire__)
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109 moveql #5,d0
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110 bclr d0,0xFFFFFA0F:w /* Clear service bit */
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111
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112 movel sp@+,d0
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113 #else
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114 bclr #5,0xFFFFFA0F:w /* Clear service bit */
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115 #endif
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116 rte
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117
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118 /*--- Xbios interrupt vector ---*/
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119
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120 _SDL_MintAudio_XbiosInterrupt:
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121 #if defined(__mcoldfire__)
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122 lea sp@(-60),sp
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123 moveml d0-d7/a0-a6,sp@
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124 #else
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125 moveml d0-d7/a0-a6,sp@-
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126 #endif
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127
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128 /* Reenable interrupts, so other interrupts can work */
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129 movew #0x2300,sr
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130
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131 /* Clear service bit, so other MFP interrupts can work */
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132 #if defined(__mcoldfire__)
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133 moveql #5,d0
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134 bclr d0,0xfffffa0f:w
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135 #else
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136 bclr #5,0xfffffa0f:w
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137 #endif
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138
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139 /* Check if we are not already running */
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140 tstw _SDL_MintAudio_mutex
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141 bne SDL_MintAudio_XbiosEnd
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142
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143 #if defined(__mcoldfire__)
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144 movew _SDL_MintAudio_mutex,d0
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145 notl d0
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146 movew d0,_SDL_MintAudio_mutex
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147
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148 movew _SDL_MintAudio_numbuf,d1
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149 eorl #1,d1
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150 movew d1,_SDL_MintAudio_numbuf
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151 #else
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152 notw _SDL_MintAudio_mutex
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153
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154 /* Swap buffers */
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155 eorw #1,_SDL_MintAudio_numbuf
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156 #endif
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157
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158 /* Save FPU if needed */
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159 tstw _SDL_MintAudio_hasfpu
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160 beqs SDL_MintAudio_Xbios_nofpu1
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161 SAVE_FPU_CONTEXT
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162 SDL_MintAudio_Xbios_nofpu1:
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163
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164 /* Callback */
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165 jsr _SDL_MintAudio_Callback
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166
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167 /* Restore FPU if needed */
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168 tstw _SDL_MintAudio_hasfpu
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169 beqs SDL_MintAudio_Xbios_nofpu2
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170 RESTORE_FPU_CONTEXT
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171 SDL_MintAudio_Xbios_nofpu2:
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172
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173 /* Reserve space for registers */
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174 #if defined(__mcoldfire__)
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175 movel #savamt,d0
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176 subl d0,savptr
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177 #else
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178 subl #savamt,savptr
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179 #endif
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180
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181 /* Set new buffer */
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182
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183 moveq #0,d0
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184 movel _SDL_MintAudio_audiosize,d1
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185
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186 movew _SDL_MintAudio_numbuf,d0
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187 lsll #2,d0
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188 lea _SDL_MintAudio_audiobuf,a0
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189 movel a0@(d0:l),a1
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190
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191 lea a1@(d1:l),a2
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192
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193 movel a2,sp@-
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194 movel a1,sp@-
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195 clrw sp@-
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196 movew #131,sp@-
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197 trap #14
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198 lea sp@(12),sp
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199
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200 /* Restore registers space */
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201 #if defined(__mcoldfire__)
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202 movel #savamt,d0
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203 addl d0,savptr
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204 #else
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205 addl #savamt,savptr
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206 #endif
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207
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208 clrw _SDL_MintAudio_mutex
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209 SDL_MintAudio_XbiosEnd:
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210 #if defined(__mcoldfire__)
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211 moveml sp@,d0-d7/a0-a6
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212 lea sp@(60),sp
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213 #else
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214 moveml sp@+,d0-d7/a0-a6
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215 #endif
644
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216 rte
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217
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218 /*--- DMA 8 bits interrupt vector ---*/
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219
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220 _SDL_MintAudio_Dma8Interrupt:
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221 #if defined(__mcoldfire__)
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222 lea sp@(-16),sp
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223 moveml d0-d1/a0-a1,sp@
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224 #else
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225 moveml d0-d1/a0-a1,sp@-
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226 #endif
644
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227
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228 /* Reenable interrupts, so other interrupts can work */
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229 movew #0x2300,sr
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230
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231 /* Clear service bit, so other MFP interrupts can work */
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232 #if defined(__mcoldfire__)
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233 moveql #5,d0
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234 bclr d0,0xfffffa0f:w
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235 #else
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236 bclr #5,0xfffffa0f:w
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237 #endif
644
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238 /* Check if we are not already running */
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239 tstw _SDL_MintAudio_mutex
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240 bne SDL_MintAudio_Dma8End
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241
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242 #if defined(__mcoldfire__)
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243 movew _SDL_MintAudio_mutex,d0
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244 notl d0
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245 movew d0,_SDL_MintAudio_mutex
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246
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247 movew _SDL_MintAudio_numbuf,d1
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248 eorl #1,d1
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249 movew d1,_SDL_MintAudio_numbuf
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250 #else
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251 notw _SDL_MintAudio_mutex
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252
644
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253 /* Swap buffers */
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254 eorw #1,_SDL_MintAudio_numbuf
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255 #endif
644
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256
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257 /* Save FPU if needed */
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258 tstw _SDL_MintAudio_hasfpu
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259 beqs SDL_MintAudio_Dma8_nofpu1
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260 SAVE_FPU_CONTEXT
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261 SDL_MintAudio_Dma8_nofpu1:
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262
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263 /* Callback */
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264 jsr _SDL_MintAudio_Callback
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265
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266 /* Restore FPU if needed */
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267 tstw _SDL_MintAudio_hasfpu
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268 beqs SDL_MintAudio_Dma8_nofpu2
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269 RESTORE_FPU_CONTEXT
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270 SDL_MintAudio_Dma8_nofpu2:
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271
704
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272 /* Set new buffer */
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273
704
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274 moveq #0,d0
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275
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276 movew _SDL_MintAudio_numbuf,d0
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277 lsll #2,d0
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278 lea _SDL_MintAudio_audiobuf,a0
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279 movel a0@(d0:l),d1
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280
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281 /* Modify DMA addresses */
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282 lea 0xffff8900:w,a0
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283
4380
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284 movel d1,d0
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285
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286 moveb d0,a0@(0x07) /* Start address */
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287 lsrl #8,d0
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288 moveb d0,a0@(0x05)
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289 lsrl #8,d0
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290 moveb d0,a0@(0x03)
644
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291
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292 addl _SDL_MintAudio_audiosize,d1
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293
4380
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294 movel d1,d0
644
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295
4380
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296 moveb d0,a0@(0x13) /* End address */
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297 lsrl #8,d0
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298 moveb d0,a0@(0x11)
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299 lsrl #8,d0
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300 moveb d0,a0@(0x0f)
644
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301
594422ab8f9f Atari MiNT: added more audio drivers
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302 clrw _SDL_MintAudio_mutex
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303 SDL_MintAudio_Dma8End:
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304 #if defined(__mcoldfire__)
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305 moveml sp@,d0-d1/a0-a1
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306 lea sp@(16),sp
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307 #else
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308 moveml sp@+,d0-d1/a0-a1
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309 #endif
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310 rte
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311
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312 /*--- STFA interrupt vector ---*/
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313
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314 STFA_SOUND_START = 6
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315 STFA_SOUND_END = STFA_SOUND_START+8
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316
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317 _SDL_MintAudio_StfaInterrupt:
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318 /* Reenable interrupts, so other interrupts can work */
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319 movew #0x2300,sr
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320
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321 /* Check if we are not already running */
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322 tstw _SDL_MintAudio_mutex
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323
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324 #if defined(__mcoldfire__)
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325 bne SDL_MintAudio_StfaEnd
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326
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327 lea sp@(-60),sp
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328 moveml d0-d7/a0-a6,sp@
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329
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330 movew _SDL_MintAudio_mutex,d0
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331 notl d0
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332 movew d0,_SDL_MintAudio_mutex
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333
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334 movew _SDL_MintAudio_numbuf,d1
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335 eorl #1,d1
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336 movew d1,_SDL_MintAudio_numbuf
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337 #else
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338 bnes SDL_MintAudio_StfaEnd
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339
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340 moveml d0-d7/a0-a6,sp@-
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341
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342 notw _SDL_MintAudio_mutex
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343
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344 /* Swap buffers */
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345 eorw #1,_SDL_MintAudio_numbuf
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346 #endif
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347
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348 /* Save FPU if needed */
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349 tstw _SDL_MintAudio_hasfpu
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350 beqs SDL_MintAudio_Stfa_nofpu1
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351 SAVE_FPU_CONTEXT
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352 SDL_MintAudio_Stfa_nofpu1:
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353
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354 /* Callback */
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355 jsr _SDL_MintAudio_Callback
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356
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357 /* Restore FPU if needed */
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358 tstw _SDL_MintAudio_hasfpu
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359 beqs SDL_MintAudio_Stfa_nofpu2
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360 RESTORE_FPU_CONTEXT
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361 SDL_MintAudio_Stfa_nofpu2:
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362
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363 /* Set new buffer */
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364
704
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365 moveq #0,d0
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366 movel _SDL_MintAudio_stfa,a1
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367
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368 movew _SDL_MintAudio_numbuf,d0
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369 lsll #2,d0
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370 lea _SDL_MintAudio_audiobuf,a0
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371 movel a0@(d0:l),d1
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372
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373 /* Modify STFA replay buffers */
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374 movel d1,a1@(STFA_SOUND_START)
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375 addl _SDL_MintAudio_audiosize,d1
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376 movel d1,a1@(STFA_SOUND_END)
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377
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378 #if defined(__mcoldfire__)
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379 moveml sp@,d0-d7/a0-a6
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380 lea sp@(60),sp
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381 #else
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382 moveml sp@+,d0-d7/a0-a6
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383 #endif
644
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384 clrw _SDL_MintAudio_mutex
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385 SDL_MintAudio_StfaEnd:
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386 rte