1 | /** |
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2 | * @file |
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3 | * |
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4 | * @ingroup rtems_bsd_rtems |
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5 | * |
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6 | * @brief TODO. |
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7 | */ |
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8 | |
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9 | /* |
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10 | * Copyright (c) 2009-2013 embedded brains GmbH. All rights reserved. |
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11 | * |
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12 | * embedded brains GmbH |
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13 | * Dornierstr. 4 |
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14 | * 82178 Puchheim |
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15 | * Germany |
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16 | * <rtems@embedded-brains.de> |
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17 | * |
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18 | * Redistribution and use in source and binary forms, with or without |
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19 | * modification, are permitted provided that the following conditions |
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20 | * are met: |
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21 | * 1. Redistributions of source code must retain the above copyright |
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22 | * notice, this list of conditions and the following disclaimer. |
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23 | * 2. Redistributions in binary form must reproduce the above copyright |
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24 | * notice, this list of conditions and the following disclaimer in the |
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25 | * documentation and/or other materials provided with the distribution. |
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26 | * |
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27 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
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28 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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29 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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30 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
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31 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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32 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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33 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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34 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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35 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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36 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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37 | * SUCH DAMAGE. |
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38 | */ |
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39 | |
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40 | #include <machine/rtems-bsd-kernel-space.h> |
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41 | #include <machine/rtems-bsd-thread.h> |
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42 | #include <machine/rtems-bsd-support.h> |
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43 | |
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44 | #include <rtems/bsd/sys/param.h> |
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45 | #include <rtems/bsd/sys/types.h> |
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46 | #include <sys/systm.h> |
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47 | #include <sys/kernel.h> |
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48 | #include <sys/proc.h> |
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49 | #include <sys/kthread.h> |
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50 | #include <sys/malloc.h> |
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51 | #include <sys/selinfo.h> |
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52 | |
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53 | #include <rtems/score/objectimpl.h> |
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54 | #include <rtems/score/statesimpl.h> |
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55 | #include <rtems/score/threaddispatch.h> |
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56 | #include <rtems/score/thread.h> |
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57 | #include <rtems/score/threadimpl.h> |
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58 | #include <rtems/score/threadqimpl.h> |
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59 | |
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60 | static size_t rtems_bsd_extension_index; |
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61 | |
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62 | static CHAIN_DEFINE_EMPTY(rtems_bsd_thread_delay_start_chain); |
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63 | |
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64 | static bool rtems_bsd_thread_ready_to_start; |
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65 | |
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66 | struct thread * |
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67 | rtems_bsd_get_thread(const Thread_Control *thread) |
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68 | { |
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69 | return thread->extensions[rtems_bsd_extension_index]; |
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70 | } |
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71 | |
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72 | static Thread_Control * |
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73 | rtems_bsd_get_thread_by_id(rtems_id task_id) |
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74 | { |
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75 | Thread_Control *thread; |
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76 | Objects_Locations location; |
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77 | |
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78 | thread = _Thread_Get(task_id, &location); |
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79 | switch (location) { |
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80 | case OBJECTS_LOCAL: |
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81 | _Objects_Put(&thread->Object); |
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82 | break; |
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83 | #if defined(RTEMS_MULTIPROCESSING) |
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84 | case OBJECTS_REMOTE: |
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85 | _Thread_Dispatch(); |
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86 | thread = NULL; |
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87 | break; |
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88 | #endif |
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89 | default: |
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90 | thread = NULL; |
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91 | break; |
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92 | } |
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93 | |
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94 | return thread; |
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95 | } |
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96 | |
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97 | struct thread * |
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98 | rtems_bsd_thread_create(Thread_Control *thread, int wait) |
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99 | { |
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100 | struct thread *td = malloc(sizeof(*td), M_TEMP, M_ZERO | wait); |
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101 | struct sleepqueue *sq = malloc(sizeof(*sq), M_TEMP, wait); |
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102 | |
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103 | if (td != NULL && sq != NULL) { |
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104 | td->td_thread = thread; |
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105 | td->td_sleepqueue = sq; |
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106 | |
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107 | LIST_INIT(&sq->sq_free); |
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108 | |
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109 | _Thread_queue_Initialize( |
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110 | &sq->sq_blocked, |
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111 | THREAD_QUEUE_DISCIPLINE_PRIORITY, |
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112 | STATES_WAITING_FOR_BSD_WAKEUP, |
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113 | EWOULDBLOCK |
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114 | ); |
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115 | } else { |
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116 | free(td, M_TEMP); |
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117 | free(sq, M_TEMP); |
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118 | td = NULL; |
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119 | } |
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120 | |
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121 | thread->extensions[rtems_bsd_extension_index] = td; |
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122 | |
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123 | return td; |
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124 | } |
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125 | |
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126 | static struct thread * |
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127 | rtems_bsd_get_curthread(int wait) |
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128 | { |
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129 | Thread_Control *executing = _Thread_Get_executing(); |
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130 | struct thread *td = rtems_bsd_get_thread(executing); |
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131 | |
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132 | if (td == NULL) { |
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133 | td = rtems_bsd_thread_create(executing, wait); |
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134 | } |
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135 | |
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136 | return td; |
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137 | } |
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138 | |
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139 | struct thread * |
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140 | rtems_bsd_get_curthread_or_wait_forever(void) |
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141 | { |
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142 | return rtems_bsd_get_curthread(M_WAITOK); |
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143 | } |
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144 | |
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145 | struct thread * |
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146 | rtems_bsd_get_curthread_or_null(void) |
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147 | { |
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148 | return rtems_bsd_get_curthread(0); |
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149 | } |
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150 | |
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151 | static bool |
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152 | rtems_bsd_is_bsd_thread(Thread_Control *thread) |
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153 | { |
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154 | return thread->Object.name.name_u32 == BSD_TASK_NAME; |
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155 | } |
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156 | |
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157 | static bool |
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158 | rtems_bsd_extension_thread_create( |
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159 | Thread_Control *executing, |
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160 | Thread_Control *created |
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161 | ) |
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162 | { |
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163 | bool ok; |
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164 | |
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165 | if (rtems_bsd_is_bsd_thread(created)) { |
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166 | struct thread *td = rtems_bsd_thread_create(created, 0); |
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167 | |
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168 | ok = td != NULL; |
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169 | } else { |
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170 | ok = true; |
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171 | } |
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172 | |
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173 | return ok; |
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174 | } |
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175 | |
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176 | static void |
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177 | rtems_bsd_extension_thread_delete( |
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178 | Thread_Control *executing, |
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179 | Thread_Control *deleted |
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180 | ) |
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181 | { |
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182 | struct thread *td = rtems_bsd_get_thread(deleted); |
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183 | |
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184 | if (td != NULL) { |
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185 | seltdfini(td); |
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186 | free(td->td_sleepqueue, M_TEMP); |
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187 | free(td, M_TEMP); |
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188 | } |
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189 | } |
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190 | |
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191 | static const rtems_extensions_table rtems_bsd_extensions = { |
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192 | .thread_create = rtems_bsd_extension_thread_create, |
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193 | .thread_delete = rtems_bsd_extension_thread_delete |
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194 | }; |
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195 | |
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196 | static void |
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197 | rtems_bsd_threads_init_early(void *arg) |
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198 | { |
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199 | rtems_id ext_id; |
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200 | rtems_status_code sc; |
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201 | |
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202 | (void) arg; |
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203 | |
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204 | sc = rtems_extension_create( |
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205 | BSD_TASK_NAME, |
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206 | &rtems_bsd_extensions, |
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207 | &ext_id |
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208 | ); |
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209 | if (sc != RTEMS_SUCCESSFUL) { |
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210 | BSD_PANIC("cannot create extension"); |
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211 | } |
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212 | |
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213 | rtems_bsd_extension_index = rtems_object_id_get_index(ext_id); |
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214 | } |
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215 | |
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216 | static void |
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217 | rtems_bsd_threads_init_late(void *arg) |
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218 | { |
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219 | Chain_Control *chain = &rtems_bsd_thread_delay_start_chain; |
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220 | Chain_Node *node; |
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221 | |
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222 | (void) arg; |
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223 | |
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224 | while ((node = _Chain_Get_unprotected(chain)) != NULL) { |
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225 | Thread_Control *thread = (Thread_Control *) node; |
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226 | rtems_status_code sc; |
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227 | |
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228 | sc = rtems_task_start(thread->Object.id, (rtems_task_entry) |
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229 | thread->Start.entry_point, thread->Start.numeric_argument); |
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230 | BSD_ASSERT(sc == RTEMS_SUCCESSFUL); |
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231 | } |
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232 | |
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233 | rtems_bsd_thread_ready_to_start = true; |
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234 | } |
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235 | |
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236 | SYSINIT(rtems_bsd_threads_early, SI_SUB_INTRINSIC, SI_ORDER_ANY, |
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237 | rtems_bsd_threads_init_early, NULL); |
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238 | |
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239 | SYSINIT(rtems_bsd_threads_late, SI_SUB_RUN_SCHEDULER, SI_ORDER_ANY, |
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240 | rtems_bsd_threads_init_late, NULL); |
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241 | |
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242 | static int |
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243 | rtems_bsd_thread_start(struct thread **td_ptr, void (*func)(void *), void *arg, |
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244 | int flags, int pages, const char *fmt, va_list ap) |
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245 | { |
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246 | int eno = 0; |
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247 | rtems_status_code sc; |
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248 | rtems_id task_id; |
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249 | |
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250 | BSD_ASSERT(pages >= 0); |
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251 | |
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252 | sc = rtems_task_create( |
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253 | BSD_TASK_NAME, |
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254 | BSD_TASK_PRIORITY_NORMAL, |
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255 | BSD_MINIMUM_TASK_STACK_SIZE + (size_t) pages * PAGE_SIZE, |
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256 | RTEMS_DEFAULT_MODES, |
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257 | RTEMS_DEFAULT_ATTRIBUTES, |
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258 | &task_id |
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259 | ); |
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260 | if (sc == RTEMS_SUCCESSFUL) { |
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261 | Thread_Control *thread = rtems_bsd_get_thread_by_id(task_id); |
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262 | struct thread *td; |
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263 | |
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264 | BSD_ASSERT(thread != NULL); |
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265 | |
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266 | td = rtems_bsd_get_thread(thread); |
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267 | BSD_ASSERT(td != NULL); |
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268 | |
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269 | vsnprintf(td->td_name, sizeof(td->td_name), fmt, ap); |
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270 | |
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271 | if (rtems_bsd_thread_ready_to_start) { |
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272 | sc = rtems_task_start(task_id, (rtems_task_entry) func, |
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273 | (rtems_task_argument) arg); |
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274 | BSD_ASSERT(sc == RTEMS_SUCCESSFUL); |
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275 | } else { |
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276 | thread->Start.entry_point = (Thread_Entry) func; |
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277 | thread->Start.numeric_argument = |
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278 | (Thread_Entry_numeric_type) arg; |
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279 | _Chain_Append_unprotected( |
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280 | &rtems_bsd_thread_delay_start_chain, |
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281 | &thread->Object.Node); |
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282 | } |
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283 | |
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284 | if (td_ptr != NULL) { |
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285 | *td_ptr = td; |
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286 | } |
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287 | } else { |
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288 | eno = ENOMEM; |
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289 | } |
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290 | |
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291 | return eno; |
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292 | } |
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293 | |
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294 | static __dead2 void |
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295 | rtems_bsd_thread_delete(void) |
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296 | { |
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297 | rtems_task_delete(RTEMS_SELF); |
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298 | BSD_PANIC("delete self failed"); |
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299 | } |
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300 | |
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301 | void |
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302 | kproc_start(const void *udata) |
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303 | { |
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304 | const struct kproc_desc *pd = udata; |
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305 | int eno = kproc_create((void (*)(void *))pd->func, NULL, pd->global_procpp, 0, 0, "%s", pd->arg0); |
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306 | |
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307 | BSD_ASSERT(eno == 0); |
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308 | } |
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309 | |
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310 | int |
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311 | kproc_create(void (*func)(void *), void *arg, struct proc **newpp, int flags, int pages, const char *fmt, ...) |
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312 | { |
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313 | int eno = 0; |
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314 | va_list ap; |
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315 | |
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316 | va_start(ap, fmt); |
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317 | eno = rtems_bsd_thread_start(newpp, func, arg, flags, pages, fmt, ap); |
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318 | va_end(ap); |
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319 | |
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320 | return eno; |
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321 | } |
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322 | |
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323 | void |
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324 | kproc_exit(int ecode) |
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325 | { |
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326 | rtems_bsd_thread_delete(); |
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327 | } |
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328 | |
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329 | void |
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330 | kthread_start(const void *udata) |
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331 | { |
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332 | const struct kthread_desc *td = udata; |
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333 | int eno = kthread_add((void (*)(void *)) td->func, NULL, NULL, td->global_threadpp, 0, 0, "%s", td->arg0); |
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334 | |
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335 | BSD_ASSERT(eno == 0); |
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336 | } |
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337 | |
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338 | int |
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339 | kthread_add(void (*func)(void *), void *arg, struct proc *p, struct thread **newtdp, int flags, int pages, const char *fmt, ...) |
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340 | { |
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341 | int eno = 0; |
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342 | va_list ap; |
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343 | |
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344 | va_start(ap, fmt); |
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345 | eno = rtems_bsd_thread_start(newtdp, func, arg, flags, pages, fmt, ap); |
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346 | va_end(ap); |
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347 | |
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348 | return eno; |
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349 | } |
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350 | |
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351 | void |
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352 | kthread_exit(void) |
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353 | { |
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354 | rtems_bsd_thread_delete(); |
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355 | } |
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356 | |
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357 | int |
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358 | kproc_kthread_add(void (*func)(void *), void *arg, struct proc **procptr, struct thread **tdptr, int flags, int pages, const char * procname, const char *fmt, ...) |
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359 | { |
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360 | int eno = 0; |
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361 | va_list ap; |
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362 | |
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363 | va_start(ap, fmt); |
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364 | eno = rtems_bsd_thread_start(tdptr, func, arg, flags, pages, fmt, ap); |
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365 | va_end(ap); |
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366 | |
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367 | return eno; |
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368 | } |
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