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annotate src/audio/mint/SDL_mintaudio_it.S @ 4389:c6c3a6e7db46 SDL-1.2

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Fixed bug #899 Jeremiah Morris 2009-12-09 16:23:50 PST Re-enable mouseLocation workaround on 10.4, 10.5 OS X systems before 10.6 have a bug with [NSEvent mouseLocation] if the screen resolution changes. SDL_QuartzVideo.m contains a workaround for this bug, but it was placed inside an #ifdef in revision 4762. The comment reads, "I'm gambling they fixed this by 10.4." After seeing this bug on several Tiger and Leopard systems (both PPC and Intel), I can confirm that it's not fixed until 10.6. The workaround doesn't compile for x86_64/10.6, so I can understand why it was segregated, but it needs to remain in place for the i386 and ppc versions. The workaround causes no problems under 10.6, even though it's not necessary there. Patch is attached with one method of keeping the workaround active on the systems that need it.
author Sam Lantinga <slouken@libsdl.org>
date Fri, 11 Dec 2009 15:11:49 +0000
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children
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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
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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
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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
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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
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272 /* Set new buffer */
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273
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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
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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
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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)
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301
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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
4380
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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
3866
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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
704
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354 /* Callback */
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355 jsr _SDL_MintAudio_Callback
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356
3866
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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
704
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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
4380
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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