1 | /* |
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2 | * dev_txt.c - TXT (Text Terminal) generic device API implementation. |
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3 | * |
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4 | * Author Alain Greiner (2016) |
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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-MK |
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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-kernel; 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_types.h> |
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25 | #include <hal_special.h> |
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26 | #include <hal_remote.h> |
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27 | #include <soclib_tty.h> |
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28 | #include <thread.h> |
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29 | #include <rpc.h> |
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30 | #include <printk.h> |
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31 | #include <dev_txt.h> |
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32 | |
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33 | ///////////////////////////////////////////////////////////////////////////////////////// |
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34 | // Extern global variables |
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35 | ///////////////////////////////////////////////////////////////////////////////////////// |
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36 | |
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37 | extern chdev_directory_t chdev_dir; // allocated in kernel_init.c |
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38 | |
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39 | extern chdev_pic_input_t chdev_pic_input; // allocated in kernel_init.c |
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40 | |
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41 | //////////////////////////////////// |
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42 | void dev_txt_init( chdev_t * chdev ) |
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43 | { |
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44 | // the local ICU chdev must be initialized before the TXT chdev, because |
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45 | // the TXT chdev initialisation requires allocation of a WTI from local ICU |
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46 | xptr_t icu_xp = chdev_dir.icu[local_cxy]; |
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47 | assert( (icu_xp != XPTR_NULL) , __FUNCTION__ , "ICU not initialised before TXT" ); |
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48 | |
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49 | // get implementation and channel index |
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50 | uint32_t impl = chdev->impl; |
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51 | uint32_t channel = chdev->channel; |
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52 | |
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53 | // set fields "cmd", "isr", and call driver init function |
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54 | if( impl == IMPL_TXT_TTY ) |
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55 | { |
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56 | chdev->cmd = &soclib_tty_cmd; |
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57 | chdev->isr = &soclib_tty_isr; |
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58 | soclib_tty_init( chdev ); |
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59 | } |
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60 | else |
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61 | { |
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62 | assert( false , __FUNCTION__ , "undefined TXT device implementation" ); |
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63 | } |
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64 | |
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65 | // get a WTI mailbox from local ICU |
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66 | uint32_t wti_id = dev_icu_wti_alloc(); |
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67 | |
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68 | assert( (wti_id != -1) , __FUNCTION__ , "cannot allocate WTI mailbox" ); |
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69 | |
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70 | // select a core |
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71 | lid_t lid = cluster_select_local_core(); |
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72 | |
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73 | // enable WTI IRQ and update WTI interrupt vector |
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74 | dev_icu_enable_irq( lid , WTI_TYPE , wti_id , chdev ); |
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75 | |
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76 | // link IOC IRQ to WTI mailbox in PIC component |
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77 | uint32_t irq_id = chdev_pic_input.txt[channel]; |
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78 | dev_pic_bind_irq( irq_id , local_cxy , wti_id ); |
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79 | |
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80 | // create server thread |
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81 | thread_t * new_thread; |
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82 | error_t error; |
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83 | |
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84 | error = thread_kernel_create( &new_thread, |
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85 | THREAD_DEV, |
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86 | &chdev_sequencial_server, |
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87 | chdev, |
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88 | lid ); |
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89 | assert( (error == 0) , __FUNCTION__ , "cannot create server thread" ); |
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90 | |
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91 | // set "server" field in chdev descriptor |
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92 | chdev->server = new_thread; |
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93 | |
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94 | // start server thread |
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95 | thread_unblock( XPTR( local_cxy , new_thread ) , THREAD_BLOCKED_GLOBAL ); |
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96 | |
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97 | } // end dev_txt_init() |
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98 | |
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99 | |
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100 | ////////////////////////////////////////////////////////////////////////////////// |
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101 | // This static function is called by dev_txt_read(), dev_txt_write() functions. |
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102 | ////////////////////////////////////i///////////////////////////////////////////// |
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103 | static error_t dev_txt_access( uint32_t type, |
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104 | uint32_t channel, |
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105 | char * buffer, |
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106 | uint32_t count ) |
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107 | { |
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108 | thread_t * this = CURRENT_THREAD; |
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109 | |
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110 | txt_dmsg("\n[INFO] in %s : thread %x in process %x enters\n", |
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111 | __FUNCTION__ , this->trdid , this->process->pid ); |
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112 | |
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113 | // check channel argument |
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114 | assert( (channel < CONFIG_MAX_TXT_CHANNELS) , __FUNCTION__ , "illegal channel index" ); |
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115 | |
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116 | // get extended pointer on remote TXT chdev descriptor |
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117 | xptr_t dev_xp = chdev_dir.txt[channel]; |
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118 | |
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119 | assert( (dev_xp != XPTR_NULL) , __FUNCTION__ , "undefined TXT chdev descriptor" ); |
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120 | |
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121 | // register command in calling thread descriptor |
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122 | this->command.txt.dev_xp = dev_xp; |
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123 | this->command.txt.type = type; |
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124 | this->command.txt.buf_xp = XPTR( local_cxy , buffer ); |
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125 | this->command.txt.count = count; |
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126 | |
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127 | // register client thread in waiting queue, activate server thread |
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128 | // block client thread on THREAD_BLOCKED_IO and deschedule. |
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129 | // it is re-activated by the ISR signaling IO operation completion. |
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130 | chdev_register_command( dev_xp , this ); |
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131 | |
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132 | txt_dmsg("\n[INFO] in %s : thread %x in process %x completes / error = %d\n", |
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133 | __FUNCTION__ , this->trdid , this->process->pid , this->command.txt.error ); |
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134 | |
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135 | // return I/O operation status from calling thread descriptor |
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136 | return this->command.txt.error; |
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137 | |
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138 | } // end dev_txt_access() |
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139 | |
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140 | ///////////////////////////////////////// |
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141 | error_t dev_txt_write( uint32_t channel, |
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142 | char * buffer, |
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143 | uint32_t count ) |
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144 | { |
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145 | return dev_txt_access( TXT_WRITE , channel , buffer , count ); |
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146 | } |
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147 | |
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148 | ///////////////////////////////////////// |
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149 | error_t dev_txt_read( uint32_t channel, |
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150 | char * buffer ) |
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151 | { |
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152 | return dev_txt_access( TXT_READ , channel , buffer , 1 ); |
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153 | } |
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154 | |
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155 | /////////////////////////////////////////////// |
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156 | error_t dev_txt_sync_write( uint32_t channel, |
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157 | char * buffer, |
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158 | uint32_t count ) |
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159 | { |
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160 | // get pointer on calling thread |
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161 | thread_t * this = CURRENT_THREAD; |
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162 | |
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163 | // get extended pointer on TXT[0] chdev |
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164 | xptr_t dev_xp = chdev_dir.txt[channel]; |
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165 | |
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166 | // register command in calling thread |
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167 | this->command.txt.dev_xp = dev_xp; |
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168 | this->command.txt.type = TXT_SYNC_WRITE; |
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169 | this->command.txt.buf_xp = XPTR( local_cxy , buffer ); |
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170 | this->command.txt.count = count; |
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171 | |
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172 | // get driver command function |
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173 | cxy_t dev_cxy = GET_CXY( dev_xp ); |
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174 | chdev_t * dev_ptr = (chdev_t *)GET_PTR( dev_xp ); |
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175 | dev_cmd_t * cmd = (dev_cmd_t *)hal_remote_lpt( XPTR( dev_cxy , &dev_ptr->cmd ) ); |
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176 | |
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177 | // call directly driver command |
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178 | cmd( XPTR( local_cxy , this ) ); |
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179 | |
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180 | // return I/O operation status from calling thread descriptor |
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181 | return this->command.txt.error; |
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182 | |
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183 | } // end dev_txt_sync_write() |
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184 | |
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