1 | /* |
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2 | * sys_sem.c - Acces a POSIX unamed semaphore. |
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3 | * |
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4 | * Authors Alain Greiner (2016,2017,2018,2019) |
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5 | * |
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6 | * Copyright (c) UPMC Sorbonne Universites |
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7 | * |
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8 | * This file is part of ALMOS-MKH. |
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9 | * |
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10 | * ALMOS-MKH is free software; you can redistribute it and/or modify it |
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11 | * under the terms of the GNU General Public License as published by |
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12 | * the Free Software Foundation; version 2.0 of the License. |
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13 | * |
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14 | * ALMOS-MKH is distributed in the hope that it will be useful, but |
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15 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
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16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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17 | * General Public License for more details. |
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18 | * |
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19 | * You should have received a copy of the GNU General Public License |
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20 | * along with ALMOS-MKH; if not, write to the Free Software Foundation, |
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21 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
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22 | */ |
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23 | |
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24 | #include <hal_kernel_types.h> |
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25 | #include <hal_uspace.h> |
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26 | #include <hal_vmm.h> |
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27 | #include <shared_semaphore.h> |
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28 | #include <errno.h> |
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29 | #include <thread.h> |
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30 | #include <printk.h> |
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31 | #include <vmm.h> |
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32 | #include <remote_sem.h> |
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33 | #include <syscalls.h> |
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34 | |
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35 | #if DEBUG_SYS_SEM |
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36 | ////////////////////////////////////////////////// |
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37 | static char * sys_sem_op_str( uint32_t operation ) |
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38 | { |
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39 | if ( operation == SEM_INIT ) return "INIT"; |
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40 | else if( operation == SEM_WAIT ) return "WAIT"; |
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41 | else if( operation == SEM_POST ) return "POST"; |
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42 | else if( operation == SEM_GETVALUE ) return "GETVALUE"; |
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43 | else if( operation == SEM_DESTROY ) return "DESTROY"; |
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44 | else return "undefined"; |
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45 | } |
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46 | #endif |
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47 | |
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48 | ////////////////////////////////// |
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49 | int sys_sem( void * vaddr, // semaphore virtual address |
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50 | uint32_t operation, // requested operation type |
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51 | uint32_t init_value, // initial value |
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52 | uint32_t * current_value ) // pointer on current value buffer |
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53 | { |
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54 | vseg_t * vseg; // for vaddr check |
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55 | error_t error; |
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56 | |
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57 | thread_t * this = CURRENT_THREAD; |
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58 | process_t * process = this->process; |
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59 | |
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60 | #if DEBUG_SYS_SEM |
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61 | uint64_t tm_start; |
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62 | uint64_t tm_end; |
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63 | tm_start = hal_get_cycles(); |
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64 | if( DEBUG_SYS_SEM < tm_start ) |
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65 | printk("\n[DBG] %s : thread %x in process %x enter for %s / cycle %d\n", |
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66 | __FUNCTION__, this->trdid, process->pid, sys_sem_op_str( operation ), (uint32_t)tm_start ); |
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67 | #endif |
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68 | |
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69 | // check vaddr in user vspace |
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70 | error = vmm_get_vseg( process , (intptr_t)vaddr , &vseg ); |
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71 | if( error ) |
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72 | { |
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73 | |
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74 | #if DEBUG_SYSCALLS_ERROR |
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75 | printk("\n[ERROR] in %s : unmapped semaphore pointer %x / thread %x in process %x / cycle %d\n", |
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76 | __FUNCTION__ , (intptr_t)vaddr, this->trdid, process->pid, (uint32_t)hal_get_cycles() ); |
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77 | hal_vmm_display( process , false ); |
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78 | #endif |
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79 | this->errno = EINVAL; |
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80 | return -1; |
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81 | } |
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82 | |
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83 | // execute requested operation |
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84 | switch( operation ) |
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85 | { |
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86 | ////////////// |
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87 | case SEM_INIT: |
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88 | { |
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89 | // call relevant kernel function to initialize semaphore |
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90 | error = remote_sem_create( (intptr_t)vaddr , |
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91 | init_value ); |
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92 | if ( error ) |
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93 | { |
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94 | |
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95 | #if DEBUG_SYSCALLS_ERROR |
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96 | printk("\n[ERROR] in %s INIT: cannot create semaphore / thread %x in process %x / cycle %d\n", |
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97 | __FUNCTION__, this->trdid, process->pid, (uint32_t)hal_get_cycles() ); |
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98 | #endif |
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99 | this->errno = ENOMEM; |
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100 | return -1; |
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101 | } |
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102 | } |
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103 | break; |
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104 | ////////////////// |
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105 | case SEM_GETVALUE: |
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106 | { |
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107 | // check current_value buffer in user vspace |
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108 | error = vmm_get_vseg( process , (intptr_t)current_value , &vseg ); |
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109 | if( error ) |
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110 | { |
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111 | |
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112 | #if DEBUG_SYSCALLS_ERROR |
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113 | printk("\n[ERROR] in %s GETVALUE: unmapped buffer %x / thread %x in process %x / cycle %d\n", |
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114 | __FUNCTION__ , (intptr_t)current_value, this->trdid, process->pid, (uint32_t)hal_get_cycles() ); |
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115 | hal_vmm_display( process , false ); |
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116 | #endif |
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117 | this->errno = EINVAL; |
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118 | return -1; |
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119 | } |
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120 | |
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121 | // get extended pointer on remote semaphore |
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122 | xptr_t sem_xp = remote_sem_from_ident( (intptr_t)vaddr ); |
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123 | |
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124 | // check semaphore registered |
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125 | if( sem_xp == XPTR_NULL ) |
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126 | { |
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127 | |
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128 | #if DEBUG_SYSCALLS_ERROR |
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129 | printk("\n[ERROR] in %s GETVALUE: semaphore %x not found / thread %x in process %x / cycle %d\n", |
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130 | __FUNCTION__ , (intptr_t)vaddr, this->trdid, process->pid, (uint32_t)hal_get_cycles() ); |
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131 | #endif |
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132 | this->errno = EINVAL; |
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133 | return -1; |
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134 | } |
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135 | |
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136 | // call relevant kernel function to get semaphore current value |
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137 | uint32_t current; |
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138 | remote_sem_get_value( sem_xp , ¤t ); |
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139 | |
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140 | // return value to user |
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141 | hal_copy_to_uspace( local_cxy, |
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142 | ¤t, |
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143 | current_value, |
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144 | sizeof(uint32_t) ); |
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145 | } |
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146 | break; |
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147 | ////////////// |
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148 | case SEM_WAIT: |
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149 | { |
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150 | // get extended pointer on remote semaphore |
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151 | xptr_t sem_xp = remote_sem_from_ident( (intptr_t)vaddr ); |
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152 | |
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153 | // check semaphore registered |
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154 | if( sem_xp == XPTR_NULL ) |
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155 | { |
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156 | |
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157 | #if DEBUG_SYSCALLS_ERROR |
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158 | printk("\n[ERROR] in %s WAIT: semaphore %x not found / thread %x in process %x / cycle %d\n", |
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159 | __FUNCTION__ , (intptr_t)vaddr, this->trdid, process->pid, (uint32_t)hal_get_cycles() ); |
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160 | hal_vmm_display( process , true ); |
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161 | #endif |
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162 | this->errno = EINVAL; |
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163 | return -1; |
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164 | } |
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165 | |
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166 | // call relevant kernel function to wait semaphore available |
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167 | remote_sem_wait( sem_xp ); |
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168 | } |
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169 | break; |
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170 | ////////////// |
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171 | case SEM_POST: |
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172 | { |
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173 | // get extended pointer on remote semaphore |
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174 | xptr_t sem_xp = remote_sem_from_ident( (intptr_t)vaddr ); |
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175 | |
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176 | // check semaphore registered |
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177 | if( sem_xp == XPTR_NULL ) |
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178 | { |
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179 | |
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180 | #if DEBUG_SYSCALLS_ERROR |
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181 | printk("\n[ERROR] in %s POST: semaphore %x not found / thread %x in process %x / cycle %d\n", |
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182 | __FUNCTION__ , (intptr_t)vaddr, this->trdid, process->pid, (uint32_t)hal_get_cycles() ); |
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183 | #endif |
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184 | this->errno = EINVAL; |
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185 | return -1; |
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186 | } |
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187 | |
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188 | // call relevant kernel function to release semaphore |
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189 | remote_sem_post( sem_xp ); |
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190 | } |
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191 | break; |
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192 | ///////////////// |
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193 | case SEM_DESTROY: |
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194 | { |
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195 | // get extended pointer on remote semaphore |
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196 | xptr_t sem_xp = remote_sem_from_ident( (intptr_t)vaddr ); |
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197 | |
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198 | // check semaphore registered |
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199 | if( sem_xp == XPTR_NULL ) |
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200 | { |
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201 | |
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202 | #if DEBUG_SYSCALLS_ERROR |
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203 | printk("\n[ERROR] in %s DESTROY: semaphore %x not found / thread %x in process %x / cycle %d\n", |
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204 | __FUNCTION__ , (intptr_t)vaddr, this->trdid, process->pid, (uint32_t)hal_get_cycles() ); |
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205 | #endif |
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206 | this->errno = EINVAL; |
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207 | return -1; |
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208 | } |
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209 | |
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210 | // destroy semaphore |
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211 | remote_sem_destroy( sem_xp ); |
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212 | } |
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213 | break; |
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214 | /////// |
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215 | default: // undefined operation |
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216 | { |
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217 | |
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218 | #if DEBUG_SYSCALLS_ERROR |
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219 | printk("\n[ERROR] in %s : undefined operation type %d / thread %x in process %x / cycle %d\n", |
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220 | __FUNCTION__ , operation, this->trdid, process->pid, (uint32_t)hal_get_cycles() ); |
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221 | #endif |
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222 | this->errno = EINVAL; |
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223 | return -1; |
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224 | } |
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225 | } |
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226 | |
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227 | hal_fence(); |
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228 | |
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229 | #if DEBUG_SYS_SEM |
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230 | tm_end = hal_get_cycles(); |
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231 | if( DEBUG_SYS_SEM < tm_end ) |
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232 | printk("\n[DBG] %s : thread %x in process %x exit for %s / cost = %d / cycle %d\n", |
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233 | __FUNCTION__, this->trdid, process->pid, sys_sem_op_str( operation ), |
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234 | (uint32_t)(tm_end - tm_start), (uint32_t)tm_end ); |
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235 | #endif |
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236 | |
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237 | return 0; |
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238 | |
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239 | } // end sys_sem() |
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