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annotate src/timer/mint/SDL_systimer.c @ 2115:502ae1f2a577

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Set supervisor as volatile as it is modified from an interrupt
author Patrice Mandin <patmandin@gmail.com>
date Fri, 08 Jun 2007 21:44:55 +0000
parents eb5e61b72da3
children b42abf0a50bc
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2006 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 #include "SDL_config.h"
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23
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24 #ifdef SDL_TIMER_MINT
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25
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26 /*
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27 * TOS/MiNT timer driver
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28 * based on vbl vector
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29 *
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30 * Patrice Mandin
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31 */
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32
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33 #include <stdio.h>
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34 #include <sys/time.h>
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35 #include <signal.h>
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36 #include <unistd.h>
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37 #include <string.h>
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38 #include <errno.h>
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39
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40 #include <mint/cookie.h>
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41 #include <mint/sysvars.h>
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42 #include <mint/osbind.h>
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43 #include <mint/mintbind.h>
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44
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45 #include "SDL_timer.h"
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46 #include "../SDL_timer_c.h"
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47 #include "SDL_thread.h"
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48
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49 #include "SDL_vbltimer_s.h"
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50
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51 /* from audio/mint */
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52 void SDL_MintAudio_CheckFpu(void);
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53
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54 /* The first ticks value of the application */
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55 static Uint32 start;
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56 static volatile SDL_bool supervisor;
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57 static int mint_present; /* can we use Syield() ? */
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58
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59 void
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60 SDL_StartTicks(void)
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61 {
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62 void *oldpile;
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63 unsigned long dummy;
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64
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65 /* Set first ticks value */
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66 oldpile = (void *) Super(0);
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67 start = *((volatile long *) _hz_200);
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68 Super(oldpile);
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69
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70 start *= 5; /* One _hz_200 tic is 5ms */
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71
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72 mint_present = (Getcookie(C_MiNT, &dummy) == C_FOUND);
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73 }
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74
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75 Uint32
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76 SDL_GetTicks(void)
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77 {
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78 Uint32 now;
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79 void *oldpile = NULL;
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80
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81 /* Check if we are in supervisor mode
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82 (this is the case when called from SDL_ThreadedTimerCheck,
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83 which is called from RunTimer, running in the vbl vector)
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84 */
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85 if (!supervisor) {
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86 oldpile = (void *) Super(0);
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87 }
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88
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89 now = *((volatile long *) _hz_200);
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90
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91 if (!supervisor) {
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92 Super(oldpile);
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93 }
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94
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95 return ((now * 5) - start);
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96 }
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97
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98 void
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99 SDL_Delay(Uint32 ms)
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100 {
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101 Uint32 now;
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102
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103 now = SDL_GetTicks();
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104 while ((SDL_GetTicks() - now) < ms) {
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105 if (mint_present) {
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106 Syield();
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107 }
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108 }
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109 }
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110
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111 /* Data to handle a single periodic alarm */
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112 static SDL_bool timer_installed = SDL_FALSE;
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113
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114 static void
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115 RunTimer(void)
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116 {
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117 supervisor = SDL_TRUE;
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118 SDL_ThreadedTimerCheck();
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119 supervisor = SDL_FALSE;
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120 }
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121
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122 /* This is only called if the event thread is not running */
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123 int
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124 SDL_SYS_TimerInit(void)
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125 {
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126 void *oldpile;
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127
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128 supervisor = SDL_FALSE;
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129
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130 SDL_MintAudio_CheckFpu();
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131
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132 /* Install RunTimer in vbl vector */
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133 oldpile = (void *) Super(0);
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134 timer_installed = !SDL_AtariVblInstall(RunTimer);
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135 Super(oldpile);
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136
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137 if (!timer_installed) {
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138 return (-1);
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139 }
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140 return (SDL_SetTimerThreaded(0));
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141 }
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142
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143 void
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144 SDL_SYS_TimerQuit(void)
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145 {
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146 void *oldpile;
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147
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148 if (timer_installed) {
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149 /* Uninstall RunTimer vbl vector */
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150 oldpile = (void *) Super(0);
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151 SDL_AtariVblUninstall(RunTimer);
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152 Super(oldpile);
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153 timer_installed = SDL_FALSE;
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154 }
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155 }
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156
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157 int
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158 SDL_SYS_StartTimer(void)
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159 {
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160 SDL_SetError("Internal logic error: MiNT uses vbl timer");
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161 return (-1);
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162 }
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163
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164 void
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165 SDL_SYS_StopTimer(void)
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166 {
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167 return;
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168 }
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169
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170 #endif /* SDL_TIMER_MINT */
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171 /* vi: set ts=4 sw=4 expandtab: */