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annotate src/audio/mint/SDL_mintaudio_it.S @ 3866:afbcf97a5dd9 SDL-1.2

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Save/restore fpu registers if needed
author Patrice Mandin <patmandin@gmail.com>
date Sat, 16 Sep 2006 11:50:34 +0000
parents ea2a327b92d7
children 4dae257a9cbf
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, 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 /*--- Xbios interrupt vector to measure Falcon external clock ---*/
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59
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60 _SDL_MintAudio_XbiosInterruptMeasureClock: /* 1 mS */
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61
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62 btst #0,0xFFFF8901:w /* state DMA sound */
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63 beqs SDL_MintAudio_EndIntMeasure
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64 addql #1,_SDL_MintAudio_clocktics
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65 SDL_MintAudio_EndIntMeasure:
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66 bclr #5,0xFFFFFA0F:w /* Clear service bit */
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67 rte
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68
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69 /*--- Xbios interrupt vector ---*/
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70
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71 _SDL_MintAudio_XbiosInterrupt:
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72
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73 /* Reenable interrupts, so other interrupts can work */
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74 movew #0x2300,sr
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75
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76 /* Clear service bit, so other MFP interrupts can work */
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77 bclr #5,0xfffffa0f:w
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78
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79 /* Check if we are not already running */
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80 tstw _SDL_MintAudio_mutex
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81 bne SDL_MintAudio_XbiosEnd
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82 notw _SDL_MintAudio_mutex
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83
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84 /* Swap buffers */
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85 eorw #1,_SDL_MintAudio_numbuf
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86
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87 moveml d0-d7/a0-a6,sp@-
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88
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89 /* Save FPU if needed */
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90 tstw _SDL_MintAudio_hasfpu
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91 beqs SDL_MintAudio_Xbios_nofpu1
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92 fsave sp@-
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93 fmoveml fpcr/fpsr/fpiar,sp@-
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94 fmovemx fp0-fp7,sp@-
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95 SDL_MintAudio_Xbios_nofpu1:
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96
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97 /* Callback */
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98 jsr _SDL_MintAudio_Callback
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99
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100 /* Restore FPU if needed */
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101 tstw _SDL_MintAudio_hasfpu
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102 beqs SDL_MintAudio_Xbios_nofpu2
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103 fmovemx sp@+,fp0-fp7
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104 fmoveml sp@+,fpcr/fpsr/fpiar
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105 frestore sp@+
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106 SDL_MintAudio_Xbios_nofpu2:
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107
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108 /* Reserve space for registers */
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109 subl #savamt,savptr
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110
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111 /* Set new buffer */
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112
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113 moveq #0,d0
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114 movel _SDL_MintAudio_audiosize,d1
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115
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116 movew _SDL_MintAudio_numbuf,d0
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117 lsll #2,d0
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118 lea _SDL_MintAudio_audiobuf,a0
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119 movel a0@(d0:l),a1
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120
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121 lea a1@(d1:l),a2
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122
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123 movel a2,sp@-
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124 movel a1,sp@-
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125 clrw sp@-
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126 movew #131,sp@-
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127 trap #14
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128 lea sp@(12),sp
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129
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130 /* Restore registers space */
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131 addl #savamt,savptr
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132
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133 moveml sp@+,d0-d7/a0-a6
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134
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135 clrw _SDL_MintAudio_mutex
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136 SDL_MintAudio_XbiosEnd:
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137 rte
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138
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139 /*--- DMA 8 bits interrupt vector ---*/
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140
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141 _SDL_MintAudio_Dma8Interrupt:
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142
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143 /* Reenable interrupts, so other interrupts can work */
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144 movew #0x2300,sr
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145
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146 /* Clear service bit, so other MFP interrupts can work */
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147 bclr #5,0xfffffa0f:w
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148
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149 /* Check if we are not already running */
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150 tstw _SDL_MintAudio_mutex
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151 bne SDL_MintAudio_Dma8End
644
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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
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ea2a327b92d7 Only saved non preserved registers
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157 moveml d0-d1/a0-a1,sp@-
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158
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159 /* Save FPU if needed */
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160 tstw _SDL_MintAudio_hasfpu
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161 beqs SDL_MintAudio_Dma8_nofpu1
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162 fsave sp@-
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163 fmoveml fpcr/fpsr/fpiar,sp@-
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Patrice Mandin <patmandin@gmail.com>
parents: 3864
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164 fmovemx fp0-fp7,sp@-
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165 SDL_MintAudio_Dma8_nofpu1:
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166
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167 /* Callback */
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168 jsr _SDL_MintAudio_Callback
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169
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170 /* Restore FPU if needed */
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171 tstw _SDL_MintAudio_hasfpu
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172 beqs SDL_MintAudio_Dma8_nofpu2
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173 fmovemx sp@+,fp0-fp7
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174 fmoveml sp@+,fpcr/fpsr/fpiar
afbcf97a5dd9 Save/restore fpu registers if needed
Patrice Mandin <patmandin@gmail.com>
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175 frestore sp@+
afbcf97a5dd9 Save/restore fpu registers if needed
Patrice Mandin <patmandin@gmail.com>
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176 SDL_MintAudio_Dma8_nofpu2:
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177
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178 /* Set new buffer */
644
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179
704
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180 moveq #0,d0
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181
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182 movew _SDL_MintAudio_numbuf,d0
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183 lslw #2,d0
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184 lea _SDL_MintAudio_audiobuf,a0
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185 movel a0@(d0:w),d1
644
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186
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187 /* Modify DMA addresses */
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188 lea 0xffff8900:w,a0
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189
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190 moveb d1,a0@(0x07) /* Start address */
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191 rorl #8,d1
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192 moveb d1,a0@(0x05)
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193 rorl #8,d1
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194 moveb d1,a0@(0x03)
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195 swap d1
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196
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197 addl _SDL_MintAudio_audiosize,d1
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198
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199 moveb d1,a0@(0x13) /* End address */
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200 rorl #8,d1
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201 moveb d1,a0@(0x11)
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202 rorl #8,d1
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203 moveb d1,a0@(0x0f)
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204
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205 moveml sp@+,d0-d1/a0-a1
644
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206
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207 clrw _SDL_MintAudio_mutex
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208 SDL_MintAudio_Dma8End:
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209 rte
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210
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211 /*--- STFA interrupt vector ---*/
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212
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213 STFA_SOUND_START = 6
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214 STFA_SOUND_END = STFA_SOUND_START+8
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215
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216 _SDL_MintAudio_StfaInterrupt:
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217
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218 /* Reenable interrupts, so other interrupts can work */
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219 movew #0x2300,sr
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220
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221 /* Check if we are not already running */
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222 tstw _SDL_MintAudio_mutex
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223 bnes SDL_MintAudio_StfaEnd
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224 notw _SDL_MintAudio_mutex
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225
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226 /* Swap buffers */
704
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227 eorw #1,_SDL_MintAudio_numbuf
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228
1093
d00b4d8508ab Save all registers on interrupt
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diff changeset
229 moveml d0-d7/a0-a6,sp@-
644
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230
3866
afbcf97a5dd9 Save/restore fpu registers if needed
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231 /* Save FPU if needed */
afbcf97a5dd9 Save/restore fpu registers if needed
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232 tstw _SDL_MintAudio_hasfpu
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Patrice Mandin <patmandin@gmail.com>
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233 beqs SDL_MintAudio_Stfa_nofpu1
afbcf97a5dd9 Save/restore fpu registers if needed
Patrice Mandin <patmandin@gmail.com>
parents: 3864
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234 fsave sp@-
afbcf97a5dd9 Save/restore fpu registers if needed
Patrice Mandin <patmandin@gmail.com>
parents: 3864
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235 fmoveml fpcr/fpsr/fpiar,sp@-
afbcf97a5dd9 Save/restore fpu registers if needed
Patrice Mandin <patmandin@gmail.com>
parents: 3864
diff changeset
236 fmovemx fp0-fp7,sp@-
afbcf97a5dd9 Save/restore fpu registers if needed
Patrice Mandin <patmandin@gmail.com>
parents: 3864
diff changeset
237 SDL_MintAudio_Stfa_nofpu1:
afbcf97a5dd9 Save/restore fpu registers if needed
Patrice Mandin <patmandin@gmail.com>
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238
704
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239 /* Callback */
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Patrice Mandin <patmandin@gmail.com>
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240 jsr _SDL_MintAudio_Callback
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parents: 644
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241
3866
afbcf97a5dd9 Save/restore fpu registers if needed
Patrice Mandin <patmandin@gmail.com>
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242 /* Restore FPU if needed */
afbcf97a5dd9 Save/restore fpu registers if needed
Patrice Mandin <patmandin@gmail.com>
parents: 3864
diff changeset
243 tstw _SDL_MintAudio_hasfpu
afbcf97a5dd9 Save/restore fpu registers if needed
Patrice Mandin <patmandin@gmail.com>
parents: 3864
diff changeset
244 beqs SDL_MintAudio_Stfa_nofpu2
afbcf97a5dd9 Save/restore fpu registers if needed
Patrice Mandin <patmandin@gmail.com>
parents: 3864
diff changeset
245 fmovemx sp@+,fp0-fp7
afbcf97a5dd9 Save/restore fpu registers if needed
Patrice Mandin <patmandin@gmail.com>
parents: 3864
diff changeset
246 fmoveml sp@+,fpcr/fpsr/fpiar
afbcf97a5dd9 Save/restore fpu registers if needed
Patrice Mandin <patmandin@gmail.com>
parents: 3864
diff changeset
247 frestore sp@+
afbcf97a5dd9 Save/restore fpu registers if needed
Patrice Mandin <patmandin@gmail.com>
parents: 3864
diff changeset
248 SDL_MintAudio_Stfa_nofpu2:
afbcf97a5dd9 Save/restore fpu registers if needed
Patrice Mandin <patmandin@gmail.com>
parents: 3864
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249
704
c4803992e09c Small bugfixes
Patrice Mandin <patmandin@gmail.com>
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diff changeset
250 /* Set new buffer */
644
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251
704
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Patrice Mandin <patmandin@gmail.com>
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diff changeset
252 moveq #0,d0
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Patrice Mandin <patmandin@gmail.com>
parents: 644
diff changeset
253 movel _SDL_MintAudio_stfa,a1
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Patrice Mandin <patmandin@gmail.com>
parents: 644
diff changeset
254
c4803992e09c Small bugfixes
Patrice Mandin <patmandin@gmail.com>
parents: 644
diff changeset
255 movew _SDL_MintAudio_numbuf,d0
c4803992e09c Small bugfixes
Patrice Mandin <patmandin@gmail.com>
parents: 644
diff changeset
256 lslw #2,d0
c4803992e09c Small bugfixes
Patrice Mandin <patmandin@gmail.com>
parents: 644
diff changeset
257 lea _SDL_MintAudio_audiobuf,a0
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Patrice Mandin <patmandin@gmail.com>
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diff changeset
258 movel a0@(d0:w),d1
644
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259
594422ab8f9f Atari MiNT: added more audio drivers
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parents:
diff changeset
260 /* Modify STFA replay buffers */
704
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Patrice Mandin <patmandin@gmail.com>
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diff changeset
261 movel d1,a1@(STFA_SOUND_START)
644
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parents:
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262 addl _SDL_MintAudio_audiosize,d1
704
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parents: 644
diff changeset
263 movel d1,a1@(STFA_SOUND_END)
644
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parents:
diff changeset
264
1093
d00b4d8508ab Save all registers on interrupt
Patrice Mandin <patmandin@gmail.com>
parents: 961
diff changeset
265 moveml sp@+,d0-d7/a0-a6
644
594422ab8f9f Atari MiNT: added more audio drivers
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parents:
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266
594422ab8f9f Atari MiNT: added more audio drivers
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parents:
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267 clrw _SDL_MintAudio_mutex
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268 SDL_MintAudio_StfaEnd:
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269 rte