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annotate src/timer/mint/SDL_vbltimer.S @ 4381:5425a6fbacf8 SDL-1.2

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Adapt timer code for Coldfire
author Patrice Mandin <patmandin@gmail.com>
date Sat, 07 Nov 2009 20:56:09 +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 Lesser General Public
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7 License as published by the Free Software Foundation; either
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8 version 2.1 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 Lesser 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 Lesser General Public
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16 License along with this library; if not, write to the Free Software
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 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 * VBL queue routine
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25 *
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26 * Patrice Mandin
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27 */
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28
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29 #define _vbl_queue 0x456
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30 #define _hz_200 0x4ba
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31
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32 .text
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33
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34 .globl _SDL_AtariVblInstall
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35 .globl _SDL_AtariVblUninstall
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36
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37 .globl _SDL_MintAudio_hasfpu
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38
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39 /*--- Save/restore FPU context ---*/
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40
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41 #if defined(__mcoldfire__)
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42
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43 #define SAVE_FPU_CONTEXT \
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44 lea sp@(-216),sp; \
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45 fsave sp@; \
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46 fmovel fpiar,sp@-; \
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47 lea sp@(-64),sp; \
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48 fmovemd fp0-fp7,sp@
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49
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50 #define RESTORE_FPU_CONTEXT \
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51 fmovemd sp@,fp0-fp7; \
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52 lea sp@(64),sp; \
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53 fmovel sp@+,fpiar; \
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54 frestore sp@; \
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55 lea sp@(216),sp
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56
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57 #else
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58
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59 #define SAVE_FPU_CONTEXT \
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60 .chip 68k/68881; \
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61 fsave sp@-; \
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62 fmoveml fpcr/fpsr/fpiar,sp@-; \
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63 fmovemx fp0-fp7,sp@-; \
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64 .chip 68k
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65
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66 #define RESTORE_FPU_CONTEXT \
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67 .chip 68k/68881; \
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68 fmovemx sp@+,fp0-fp7; \
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69 fmoveml sp@+,fpcr/fpsr/fpiar; \
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70 frestore sp@+; \
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71 .chip 68k
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72
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73 #endif
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74
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75 /*--- Vector installer ---*/
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76
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77 _SDL_AtariVblInstall:
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78 #if defined(__mcoldfire__)
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79 movel sp@(4),d0
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80 movel d0,my_vector
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81 #else
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82 movel sp@(4),my_vector
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83 #endif
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84
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85 lea _my_vbl,a0
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86
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87 clrw vbl_mutex
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88 #if defined(__mcoldfire__)
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89 movel _hz_200.w,d0
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90 movel d0, _SDL_Atari_hz200
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91 #else
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92 movel _hz_200.w, _SDL_Atari_hz200
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93 #endif
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94
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95 /* Stop interrupts */
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96
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97 movew #0x2700,sr
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98
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99 /* Read vbl_queue pointer */
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100 movel _vbl_queue.w,a1
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101
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102 /* Search a free place */
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103 moveq #7,d0
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104 bcl_search_place:
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105 movel (a1),d1
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106 beqs place_found
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107 addql #4,a1
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108 #if defined(__mcoldfire__)
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109 subql #1,d0
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110 bpls bcl_search_place
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111 #else
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112 dbra d0,bcl_search_place
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113 #endif
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114
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115 /* Not found */
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116 moveq #1,d0
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117 bras exit_vbl_queue
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118
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119 /* Then install ourselves */
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120 place_found:
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121 movel a0,(a1)
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122 moveq #0,d0
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123
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124 exit_vbl_queue:
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125 /* Restart interrupts */
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126 movew #0x2300,sr
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127
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128 rts
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129
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130 /*--- Vector uninstaller ---*/
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131
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132 _SDL_AtariVblUninstall:
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133 movel sp@(4),d0
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134 cmpl my_vector,d0
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135 bnes badvector
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136
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137 movel #_my_vbl,d0
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138
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139 /* Stop interrupts */
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140
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141 movew #0x2700,sr
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142
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143 /* Read vbl_queue pointer */
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144 movel _vbl_queue.w,a1
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145
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146 /* Search where we are */
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147 moveq #7,d1
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148 bcl2_search_place:
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149 cmpl (a1),d0
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150 bnes next_place
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151 clrl (a1)
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152 moveq #0,d1
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153 next_place:
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154 addql #4,a1
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155 #if defined(__mcoldfire__)
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156 subql #1,d1
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157 bpls bcl_search_place
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158 #else
281
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159 dbra d1,bcl2_search_place
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160 #endif
281
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161
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162 /* Restart interrupts */
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163 movew #0x2300,sr
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164 badvector:
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165 rts
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166
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167 /*--- Our vbl ---*/
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168
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169 _my_vbl:
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170 #if defined(__mcoldfire__)
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171 lea sp@(-60),sp
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172 moveml d0-d7/a0-a6,sp@
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173 #else
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174 moveml d0-d7/a0-a6,sp@-
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175 #endif
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176
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177 /* Update _hz_200 */
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178 #if defined(__mcoldfire__)
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179 movel _hz_200.w,d0
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180 movel d0, _SDL_Atari_hz200
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181 #else
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182 movel _hz_200.w, _SDL_Atari_hz200
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183 #endif
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184
281
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185 /* Verify if this is not already running */
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186
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187 tstw vbl_mutex
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188 bnes vbl_end
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189 #if defined(__mcoldfire__)
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190 movew vbl_mutex,d0
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191 notl d0
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192 movew d0,vbl_mutex
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193 #else
281
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194 notw vbl_mutex
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195 #endif
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196
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197 /* Save FPU if needed */
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198 tstw _SDL_MintAudio_hasfpu
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199 beqs SDL_AtariVbl_nofpu1
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200 SAVE_FPU_CONTEXT
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201 SDL_AtariVbl_nofpu1:
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202
281
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203 movel my_vector,a0
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204 jsr a0@
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205
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206 /* Restore FPU if needed */
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207 tstw _SDL_MintAudio_hasfpu
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208 beqs SDL_AtariVbl_Xbios_nofpu2
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209 RESTORE_FPU_CONTEXT
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210 SDL_AtariVbl_Xbios_nofpu2:
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211
281
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212 clrw vbl_mutex
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213 vbl_end:
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214 #if defined(__mcoldfire__)
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215 moveml sp@,d0-d7/a0-a6
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216 lea sp@(60),sp
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217 #else
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218 moveml sp@+,d0-d7/a0-a6
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219 #endif
281
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220 rts
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221
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222 .data
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223 .even
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224 .comm _SDL_Atari_hz200,4*1
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225 .even
281
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226 .comm vbl_mutex,2*1
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227 .even
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228 .comm my_vector,4*1