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961 | pj | 1 | /* |
2 | * Project: S.Ha.R.K. |
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3 | * |
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4 | * Coordinators: |
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5 | * Giorgio Buttazzo <giorgio@sssup.it> |
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6 | * Paolo Gai <pj@gandalf.sssup.it> |
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7 | * |
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8 | * Authors : |
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9 | * Paolo Gai <pj@gandalf.sssup.it> |
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10 | * Massimiliano Giorgi <massy@gandalf.sssup.it> |
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11 | * Luca Abeni <luca@gandalf.sssup.it> |
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12 | * (see the web pages for full authors list) |
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13 | * |
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14 | * ReTiS Lab (Scuola Superiore S.Anna - Pisa - Italy) |
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15 | * |
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16 | * http://www.sssup.it |
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17 | * http://retis.sssup.it |
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18 | * http://shark.sssup.it |
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19 | */ |
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20 | |||
21 | /** |
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22 | ------------ |
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23 | CVS : $Id: dummy.c,v 1.1 2005-02-25 10:55:09 pj Exp $ |
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24 | |||
25 | File: $File$ |
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26 | Revision: $Revision: 1.1 $ |
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27 | Last update: $Date: 2005-02-25 10:55:09 $ |
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28 | ------------ |
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29 | |||
30 | This file contains the Dummy scheduling module |
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31 | |||
32 | Read dummy.h for further details. |
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33 | |||
34 | **/ |
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35 | |||
36 | /* |
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37 | * Copyright (C) 2000 Paolo Gai |
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38 | * |
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39 | * This program is free software; you can redistribute it and/or modify |
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40 | * it under the terms of the GNU General Public License as published by |
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41 | * the Free Software Foundation; either version 2 of the License, or |
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42 | * (at your option) any later version. |
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43 | * |
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44 | * This program is distributed in the hope that it will be useful, |
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45 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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46 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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47 | * GNU General Public License for more details. |
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48 | * |
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49 | * You should have received a copy of the GNU General Public License |
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50 | * along with this program; if not, write to the Free Software |
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51 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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52 | * |
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53 | */ |
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54 | |||
55 | #include <dummy/dummy/dummy.h> |
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56 | #include <ll/ll.h> |
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1689 | fabio | 57 | #include <arch/stdio.h> |
58 | #include <arch/string.h> |
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961 | pj | 59 | #include <kernel/config.h> |
60 | #include <sys/types.h> |
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61 | #include <kernel/model.h> |
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62 | #include <kernel/descr.h> |
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63 | #include <kernel/var.h> |
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64 | #include <kernel/func.h> |
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65 | |||
66 | |||
67 | |||
68 | /*+ the level redefinition for the Dummy level +*/ |
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69 | typedef struct { |
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70 | level_des l; /*+ the standard level descriptor +*/ |
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71 | |||
72 | PID dummy; /*+ the dummy task... +*/ |
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73 | } dummy_level_des; |
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74 | |||
75 | |||
76 | static PID dummy_public_scheduler(LEVEL l) |
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77 | { |
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78 | dummy_level_des *lev = (dummy_level_des *)(level_table[l]); |
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79 | //kern_printf("DUMMYsched!!! %d", lev->dummy); |
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80 | return lev->dummy; |
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81 | } |
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82 | |||
83 | static int dummy_public_create(LEVEL l, PID p, TASK_MODEL *m) |
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84 | { |
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85 | dummy_level_des *lev = (dummy_level_des *)(level_table[l]); |
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86 | |||
87 | if (m->pclass != DUMMY_PCLASS) return -1; |
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88 | if (m->level != 0 && m->level != l) return -1; |
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89 | if (lev->dummy != -1) return -1; |
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90 | |||
91 | /* the dummy level doesn't introduce any new field in the TASK_MODEL |
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92 | so, all initialization stuffs are done by the task_create. |
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93 | the task state is set at SLEEP by the general task_create */ |
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94 | return 0; /* OK */ |
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95 | } |
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96 | |||
97 | static void dummy_public_dispatch(LEVEL l, PID p, int nostop) |
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98 | { |
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99 | /* nothing... the dummy hangs the cpu waiting for interrupts... */ |
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100 | } |
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101 | |||
102 | static void dummy_public_epilogue(LEVEL l, PID p) |
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103 | { |
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104 | proc_table[p].status = SLEEP; /* Paranoia */ |
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105 | } |
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106 | |||
107 | /*+ Dummy task must be present & cannot be killed; +*/ |
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108 | static TASK dummy() |
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109 | { |
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110 | /* |
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111 | It is possible to Halt the CPU & avoid consumption if idle |
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112 | cycle are intercepted with hlt instructions! |
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113 | It seems that some CPU have buggy hlt instruction or they |
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114 | have not it at all! So, if available, use the hlt facility!! |
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115 | */ |
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116 | #ifdef __HLT_WORKS__ |
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117 | for(;;) { |
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118 | // kern_printf("?"); |
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119 | hlt(); |
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120 | } |
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121 | #else |
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122 | for(;;);// kern_printf("?"); |
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123 | #endif |
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124 | } |
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125 | |||
126 | /* Registration functions */ |
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127 | |||
128 | /*+ This init function install the dummy task +*/ |
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129 | static void dummy_create(void *l) |
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130 | { |
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131 | LEVEL lev; |
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132 | PID p; |
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133 | DUMMY_TASK_MODEL m; |
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134 | |||
135 | lev = (LEVEL)l; |
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136 | |||
137 | dummy_task_default_model(m); |
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138 | dummy_task_def_level(m,lev); |
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139 | dummy_task_def_system(m); |
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140 | dummy_task_def_nokill(m); |
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141 | dummy_task_def_ctrl_jet(m); |
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142 | |||
143 | ((dummy_level_des *)level_table[lev])->dummy = p = |
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144 | task_create("Dummy", dummy, &m, NULL); |
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145 | |||
146 | if (p == NIL) |
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147 | printk("\nPanic!!! can't create dummy task...\n"); |
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148 | |||
149 | /* dummy must block all signals... */ |
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150 | proc_table[p].sigmask = 0xFFFFFFFF; |
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151 | } |
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152 | |||
153 | |||
154 | /*+ Registration function: |
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155 | TIME slice the slice for the Round Robin queue |
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156 | int createmain 1 if the level creates the main task 0 otherwise |
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157 | struct multiboot_info *mb used if createmain specified +*/ |
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158 | LEVEL dummy_register_level() |
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159 | { |
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160 | LEVEL l; /* the level that we register */ |
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161 | dummy_level_des *lev; /* for readableness only */ |
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162 | |||
163 | printk("dummy_register_level\n"); |
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164 | |||
165 | /* request an entry in the level_table */ |
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166 | l = level_alloc_descriptor(sizeof(dummy_level_des)); |
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167 | |||
168 | lev = (dummy_level_des *)level_table[l]; |
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169 | |||
170 | /* fill the standard descriptor */ |
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171 | lev->l.public_scheduler = dummy_public_scheduler; |
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172 | lev->l.public_guarantee = NULL; |
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173 | lev->l.public_create = dummy_public_create; |
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174 | lev->l.public_dispatch = dummy_public_dispatch; |
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175 | lev->l.public_epilogue = dummy_public_epilogue; |
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176 | |||
177 | /* the dummy process will be created at init_time. |
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178 | see also dummy_level_accept_model,dummy_create */ |
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179 | lev->dummy = -1; |
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180 | |||
181 | sys_atrunlevel(dummy_create,(void *) l, RUNLEVEL_INIT); |
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182 | |||
183 | return l; |
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184 | } |