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annotate src/timer/mint/SDL_systimer.c @ 2116:b42abf0a50bc

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Avoid switch to supervisor mode in SDL_GetTicks, by updating system counter from vbl interrupt
author Patrice Mandin <patmandin@gmail.com>
date Sat, 09 Jun 2007 19:58:41 +0000
parents 502ae1f2a577
children 2c835d58faad
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 SDL_bool read_hz200_from_vbl = SDL_FALSE;
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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 = start;
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79
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80 if (read_hz200_from_vbl) {
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81 now = SDL_Atari_hz200;
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82 } else {
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83 void *old_stack = (void *)Super(0);
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84 now = *((volatile long *)_hz_200);
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85 Super(old_stack);
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86 }
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87
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88 return ((now * 5) - start);
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89 }
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90
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91 void
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92 SDL_Delay(Uint32 ms)
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93 {
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94 Uint32 now;
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95
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96 now = SDL_GetTicks();
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97 while ((SDL_GetTicks() - now) < ms) {
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98 if (mint_present) {
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99 Syield();
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100 }
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101 }
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102 }
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103
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104 /* Data to handle a single periodic alarm */
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105 static SDL_bool timer_installed = SDL_FALSE;
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106
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107 /* This is only called if the event thread is not running */
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108 int
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109 SDL_SYS_TimerInit(void)
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110 {
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111 void *old_stack;
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112
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113 SDL_MintAudio_CheckFpu();
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114
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115 /* Install RunTimer in vbl vector */
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116 old_stack = (void *) Super(0);
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117 timer_installed = !SDL_AtariVblInstall(SDL_ThreadedTimerCheck);
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118 Super(old_stack);
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119
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120 if (!timer_installed) {
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121 return (-1);
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122 }
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123
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124 read_hz200_from_vbl = SDL_TRUE;
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125 return (SDL_SetTimerThreaded(0));
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126 }
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127
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128 void
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129 SDL_SYS_TimerQuit(void)
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130 {
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131 if (timer_installed) {
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132 /* Uninstall RunTimer vbl vector */
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133 void *old_stack = (void *) Super(0);
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134 SDL_AtariVblUninstall(RunTimer);
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135 Super(old_stack);
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136 timer_installed = SDL_FALSE;
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137 }
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138 read_hz200_from_vbl = SDL_FALSE;
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139 }
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140
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141 int
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142 SDL_SYS_StartTimer(void)
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143 {
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144 SDL_SetError("Internal logic error: MiNT uses vbl timer");
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145 return (-1);
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146 }
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147
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148 void
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149 SDL_SYS_StopTimer(void)
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150 {
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151 return;
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152 }
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153
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154 #endif /* SDL_TIMER_MINT */
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155 /* vi: set ts=4 sw=4 expandtab: */