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annotate packages/io/fileio/current/src/devfs.cxx @ 3292:7f8e529b4d82 default tip

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Fix FREESCALE_EDMA_NBYTES_MLOFFYES_MLOFF() so it works with negative offsets.
author vae
date Wed, 29 Apr 2015 23:31:48 +0000
parents 74dbf4c3f2e1
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 //==========================================================================
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2 //
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3 // devfs.cxx
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4 //
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5 // Fileio device filesystem
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6 //
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7 //==========================================================================
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8 // ####ECOSGPLCOPYRIGHTBEGIN####
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9 // -------------------------------------------
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10 // This file is part of eCos, the Embedded Configurable Operating System.
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11 // Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003 Free Software Foundation, Inc.
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12 //
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13 // eCos is free software; you can redistribute it and/or modify it under
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14 // the terms of the GNU General Public License as published by the Free
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15 // Software Foundation; either version 2 or (at your option) any later
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16 // version.
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17 //
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18 // eCos is distributed in the hope that it will be useful, but WITHOUT
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19 // ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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20 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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21 // for more details.
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22 //
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23 // You should have received a copy of the GNU General Public License
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24 // along with eCos; if not, write to the Free Software Foundation, Inc.,
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25 // 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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26 //
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27 // As a special exception, if other files instantiate templates or use
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28 // macros or inline functions from this file, or you compile this file
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29 // and link it with other works to produce a work based on this file,
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30 // this file does not by itself cause the resulting work to be covered by
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31 // the GNU General Public License. However the source code for this file
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32 // must still be made available in accordance with section (3) of the GNU
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33 // General Public License v2.
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34 //
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35 // This exception does not invalidate any other reasons why a work based
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36 // on this file might be covered by the GNU General Public License.
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37 // -------------------------------------------
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38 // ####ECOSGPLCOPYRIGHTEND####
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39 //==========================================================================
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40 //#####DESCRIPTIONBEGIN####
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41 //
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42 // Author(s): nickg
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43 // Contributors: nickg, gthomas
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44 // Date: 2000-05-25
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45 // Purpose: Fileio device filesystem
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46 // Description: This file implements a simple filesystem that interfaces
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47 // to the existing device IO subsystem.
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48 //
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49 //
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50 //
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51 //
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52 //####DESCRIPTIONEND####
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53 //
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54 //==========================================================================
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55
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56 #include <pkgconf/hal.h>
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57 #include <pkgconf/io_fileio.h>
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58
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59 #include <cyg/infra/cyg_trac.h> // tracing macros
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60 #include <cyg/infra/cyg_ass.h> // assertion macros
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61
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62 #include "fio.h" // Private header
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63
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64 #include <cyg/io/devtab.h> // device subsystem
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65 #include <cyg/io/config_keys.h> // CYG_IO_GET_CONFIG_SERIAL_OUTPUT_DRAIN
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66
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67 //==========================================================================
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68 // Forward definitions
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69
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70 // Filesystem operations
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71 static int dev_mount ( cyg_fstab_entry *fste, cyg_mtab_entry *mte );
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72 static int dev_umount ( cyg_mtab_entry *mte );
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73 static int dev_open ( cyg_mtab_entry *mte, cyg_dir dir, const char *name,
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74 int mode, cyg_file *fte );
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75 static int dev_unlink ( cyg_mtab_entry *mte, cyg_dir dir, const char *name );
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76 static int dev_mkdir ( cyg_mtab_entry *mte, cyg_dir dir, const char *name );
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77 static int dev_rmdir ( cyg_mtab_entry *mte, cyg_dir dir, const char *name );
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78 static int dev_rename ( cyg_mtab_entry *mte, cyg_dir dir1, const char *name1,
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79 cyg_dir dir2, const char *name2 );
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80 static int dev_link ( cyg_mtab_entry *mte, cyg_dir dir1, const char *name1,
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81 cyg_dir dir2, const char *name2, int type );
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82 static int dev_opendir ( cyg_mtab_entry *mte, cyg_dir dir, const char *name,
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83 cyg_file *fte );
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84 static int dev_chdir ( cyg_mtab_entry *mte, cyg_dir dir, const char *name,
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85 cyg_dir *dir_out );
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86 static int dev_stat ( cyg_mtab_entry *mte, cyg_dir dir, const char *name,
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87 struct stat *buf);
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88 static int dev_getinfo ( cyg_mtab_entry *mte, cyg_dir dir, const char *name,
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89 int key, void *buf, int len );
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90 static int dev_setinfo ( cyg_mtab_entry *mte, cyg_dir dir, const char *name,
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91 int key, void *buf, int len );
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92
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93 // File operations
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94 static int dev_fo_read (struct CYG_FILE_TAG *fp, struct CYG_UIO_TAG *uio);
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95 static int dev_fo_write (struct CYG_FILE_TAG *fp, struct CYG_UIO_TAG *uio);
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96 static int dev_fo_lseek (struct CYG_FILE_TAG *fp, off_t *pos, int whence );
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97 static int dev_fo_ioctl (struct CYG_FILE_TAG *fp, CYG_ADDRWORD com,
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98 CYG_ADDRWORD data);
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99 static cyg_bool dev_fo_select (struct CYG_FILE_TAG *fp, int which, CYG_ADDRWORD info);
115
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100 static int dev_fo_fsync (struct CYG_FILE_TAG *fp, int mode );
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101 static int dev_fo_close (struct CYG_FILE_TAG *fp);
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102 static int dev_fo_fstat (struct CYG_FILE_TAG *fp, struct stat *buf );
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103 static int dev_fo_getinfo (struct CYG_FILE_TAG *fp, int key, void *buf, int len );
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104 static int dev_fo_setinfo (struct CYG_FILE_TAG *fp, int key, void *buf, int len );
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105
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106
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107 //==========================================================================
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108 // Filesystem table entries
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109
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110 FSTAB_ENTRY( dev_fste, "devfs", 0,
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111 CYG_SYNCMODE_NONE, // dev system has its own sync mechanism
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112 dev_mount,
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113 dev_umount,
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114 dev_open,
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115 dev_unlink,
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116 dev_mkdir,
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117 dev_rmdir,
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118 dev_rename,
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119 dev_link,
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120 dev_opendir,
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121 dev_chdir,
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122 dev_stat,
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123 dev_getinfo,
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124 dev_setinfo);
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125
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126 MTAB_ENTRY( dev_mte,
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127 "/dev",
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128 "devfs",
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129 "",
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130 0);
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131
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132 static cyg_fileops dev_fileops =
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133 {
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134 dev_fo_read,
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135 dev_fo_write,
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136 dev_fo_lseek,
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137 dev_fo_ioctl,
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138 dev_fo_select,
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139 dev_fo_fsync,
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140 dev_fo_close,
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141 dev_fo_fstat,
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142 dev_fo_getinfo,
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143 dev_fo_setinfo
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144 };
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145
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146 //==========================================================================
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147 // Filesystem operations
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148
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149 // -------------------------------------------------------------------------
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150
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151 static int dev_mount ( cyg_fstab_entry *fste, cyg_mtab_entry *mte )
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152 {
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153 // Nothing to do here. The device IO subsystem has already initialized
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154 // iteslf, and the fileio infrastructure will do the rest.
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155
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156 return 0;
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157 }
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158
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159 // -------------------------------------------------------------------------
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160
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161 static int dev_umount ( cyg_mtab_entry *mte )
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162 {
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163 // Nothing to do here.
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164
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165 return 0;
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166 }
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167
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168 // -------------------------------------------------------------------------
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169
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170 static int dev_open ( cyg_mtab_entry *mte, cyg_dir dir, const char *name,
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171 int mode, cyg_file *file )
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172 {
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173 Cyg_ErrNo err;
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174 cyg_io_handle_t handle;
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175
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176 // The name we are passed will point to the first character after
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177 // "/dev/". We know that the full string contains the prefix string,
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178 // so we back the pointer up by 5 chars.
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179 // A better approach would be for the device table entries to only
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180 // contain the part of the string after the prefix.
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181
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182 name -= 5;
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183
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184 err = cyg_io_lookup( name, &handle );
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185
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186 if( err < 0 )
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187 return -err;
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188
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189 // If we want non-blocking mode, configure the device for it.
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190 if( (mode & (O_NONBLOCK|O_RDONLY)) == (O_NONBLOCK|O_RDONLY) )
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191 {
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192 cyg_uint32 f = 0;
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193 cyg_uint32 fsize = sizeof(f);
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194 err = cyg_io_set_config( handle, CYG_IO_SET_CONFIG_READ_BLOCKING,
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195 (void *)&f, &fsize);
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196 if( err < 0 )
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197 return -err;
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198 }
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199
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200 if( (mode & (O_NONBLOCK|O_WRONLY)) == (O_NONBLOCK|O_WRONLY) )
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201 {
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202 cyg_uint32 f = 0;
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203 cyg_uint32 fsize = sizeof(f);
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204 err = cyg_io_set_config( handle, CYG_IO_SET_CONFIG_WRITE_BLOCKING,
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205 (void *)&f, &fsize);
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206 if( err < 0 )
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207 return -err;
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208 }
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209
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210 // Initialize the file object
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211
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212 file->f_flag |= mode & CYG_FILE_MODE_MASK;
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213 file->f_type = CYG_FILE_TYPE_FILE;
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214 file->f_ops = &dev_fileops;
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215 file->f_offset = 0;
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216 file->f_data = (CYG_ADDRWORD)handle;
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217 file->f_xops = 0;
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218
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219 return 0;
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220 }
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221
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222 // -------------------------------------------------------------------------
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223
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224 static int dev_unlink ( cyg_mtab_entry *mte, cyg_dir dir, const char *name )
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225 {
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226 return EROFS;
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227 }
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228
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229 // -------------------------------------------------------------------------
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230
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231 static int dev_mkdir ( cyg_mtab_entry *mte, cyg_dir dir, const char *name )
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232 {
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233 return EROFS;
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234 }
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235
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236 // -------------------------------------------------------------------------
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237
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238 static int dev_rmdir ( cyg_mtab_entry *mte, cyg_dir dir, const char *name )
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239 {
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240 return EROFS;
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241 }
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242
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243 // -------------------------------------------------------------------------
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244
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245 static int dev_rename ( cyg_mtab_entry *mte, cyg_dir dir1, const char *name1,
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246 cyg_dir dir2, const char *name2 )
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247 {
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248 return EROFS;
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249 }
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250
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251 // -------------------------------------------------------------------------
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252
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253 static int dev_link ( cyg_mtab_entry *mte, cyg_dir dir1, const char *name1,
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254 cyg_dir dir2, const char *name2, int type )
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255 {
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256 return EROFS;
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257 }
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258
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259 // -------------------------------------------------------------------------
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260
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261 static int dev_opendir ( cyg_mtab_entry *mte, cyg_dir dir, const char *name,
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262 cyg_file *fte )
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263 {
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264 return ENOTDIR;
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265 }
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266
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267 // -------------------------------------------------------------------------
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268
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269 static int dev_chdir ( cyg_mtab_entry *mte, cyg_dir dir, const char *name,
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270 cyg_dir *dir_out )
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271 {
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272 return ENOTDIR;
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273 }
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274
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275 // -------------------------------------------------------------------------
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276
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277 static int dev_stat ( cyg_mtab_entry *mte, cyg_dir dir, const char *name,
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278 struct stat *buf)
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279 {
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280 Cyg_ErrNo err;
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281 cyg_io_handle_t handle;
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282 cyg_devtab_entry_t *dev;
115
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283
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284 name -= 5; // See comment in dev_open()
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285
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286 err = cyg_io_lookup( name, &handle );
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287
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288 if( err < 0 )
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289 return -err;
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290
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291 // Just fill in the stat buffer with some constant values.
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292 dev = (cyg_devtab_entry_t *)handle;
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293
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294 if (dev->status & CYG_DEVTAB_STATUS_BLOCK)
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295 buf->st_mode = __stat_mode_BLK;
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296 else
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297 buf->st_mode = __stat_mode_CHR;
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298
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299 buf->st_ino = (ino_t)handle; // map dev handle to inode
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300 buf->st_dev = 0; // (dev_t)handle; // same with dev id
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301 buf->st_nlink = 1;
115
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302 buf->st_uid = 0;
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303 buf->st_gid = 0;
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304 buf->st_size = 0;
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305 buf->st_atime = 0;
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306 buf->st_mtime = 0;
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307 buf->st_ctime = 0;
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308
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309 return ENOERR;
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310 }
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311
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312 // -------------------------------------------------------------------------
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313
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314 static int dev_getinfo ( cyg_mtab_entry *mte, cyg_dir dir, const char *name,
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315 int key, void *buf, int len )
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316 {
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317 return ENOSYS;
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318 }
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319
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320 // -------------------------------------------------------------------------
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321
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322 static int dev_setinfo ( cyg_mtab_entry *mte, cyg_dir dir, const char *name,
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323 int key, void *buf, int len )
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324 {
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325 return ENOSYS;
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326 }
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327
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328 //==========================================================================
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329 // File operations
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330
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331
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332 // -------------------------------------------------------------------------
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333
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334 static int dev_fo_read (struct CYG_FILE_TAG *fp, struct CYG_UIO_TAG *uio)
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335 {
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336 Cyg_ErrNo err = 0;
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337 int i;
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338
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339 // Now loop over the iovecs until they are all done, or
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340 // we get an error.
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341 for( i = 0; i < uio->uio_iovcnt; i++ )
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342 {
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343 cyg_iovec *iov = &uio->uio_iov[i];
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344 cyg_uint32 len = iov->iov_len;
196
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345 cyg_devtab_entry_t *t = (cyg_devtab_entry_t *)fp->f_data;
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346
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347 if (t->status & CYG_DEVTAB_STATUS_BLOCK)
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348 err = cyg_io_bread( (cyg_io_handle_t)t,
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349 iov->iov_base,
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350 &len, fp->f_offset);
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351 else
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352 err = cyg_io_read( (cyg_io_handle_t)t,
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353 iov->iov_base,
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354 &len);
115
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355
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356 if( err < 0 ) break;
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357
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358 uio->uio_resid -= len;
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359 }
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360
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361 return -err;
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362 }
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363
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364 // -------------------------------------------------------------------------
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365
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366 static int dev_fo_write (struct CYG_FILE_TAG *fp, struct CYG_UIO_TAG *uio)
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367 {
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368 Cyg_ErrNo err = 0;
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369 int i;
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370
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371 // Now loop over the iovecs until they are all done, or
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372 // we get an error.
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373 for( i = 0; i < uio->uio_iovcnt; i++ )
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374 {
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375 cyg_iovec *iov = &uio->uio_iov[i];
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376 cyg_uint32 len = iov->iov_len;
196
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377 cyg_devtab_entry_t *t = (cyg_devtab_entry_t *)fp->f_data;
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378
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379 if (t->status & CYG_DEVTAB_STATUS_BLOCK)
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380 err = cyg_io_bwrite( (cyg_io_handle_t)t,
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381 iov->iov_base,
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382 &len, fp->f_offset);
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383 else
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384 err = cyg_io_write( (cyg_io_handle_t)t,
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385 iov->iov_base,
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386 &len);
115
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387
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388 if( err < 0 ) break;
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389
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390 uio->uio_resid -= len;
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391 }
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392
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393 return -err;
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394 }
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395
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396 // -------------------------------------------------------------------------
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397
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398 static int dev_fo_lseek (struct CYG_FILE_TAG *fp, off_t *pos, int whence )
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399 {
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400 // All current devices have no notion of position. Just return zero
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401 // as the new position.
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402
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403 *pos = 0;
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404
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405 return ENOERR;
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406 }
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407
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408 // -------------------------------------------------------------------------
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409
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410 static int dev_fo_ioctl (struct CYG_FILE_TAG *fp, CYG_ADDRWORD com,
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411 CYG_ADDRWORD data)
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412 {
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413 return ENOSYS;
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414 }
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415
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416 // -------------------------------------------------------------------------
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417
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418 static cyg_bool dev_fo_select (struct CYG_FILE_TAG *fp, int which, CYG_ADDRWORD info)
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419 {
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420 return cyg_io_select( (cyg_io_handle_t)fp->f_data,
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421 which,
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422 info);
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423 }
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424
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425 // -------------------------------------------------------------------------
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426
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427 static int dev_fo_fsync (struct CYG_FILE_TAG *fp, int mode )
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428 {
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429 Cyg_ErrNo err;
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430
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431 err = cyg_io_get_config((cyg_io_handle_t)fp->f_data,
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432 CYG_IO_GET_CONFIG_SERIAL_OUTPUT_DRAIN,
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433 NULL, NULL);
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434
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435 return -err;
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436 }
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437
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438 // -------------------------------------------------------------------------
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439
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440 static int dev_fo_close (struct CYG_FILE_TAG *fp)
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441 {
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442 return ENOERR;
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443 }
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444
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445 // -------------------------------------------------------------------------
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446
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447 static int dev_fo_fstat (struct CYG_FILE_TAG *fp, struct stat *buf )
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448 {
1977
21507ef41413 * src/devfs.cxx (dev_stat, dev_fo_fstat): Corrected mode for block
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449 cyg_devtab_entry_t *dev = (cyg_devtab_entry_t *)fp->f_data;
115
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450
1977
21507ef41413 * src/devfs.cxx (dev_stat, dev_fo_fstat): Corrected mode for block
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451 // Just fill in the stat buffer with some constant values.
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452 if (dev->status & CYG_DEVTAB_STATUS_BLOCK)
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453 buf->st_mode = __stat_mode_BLK;
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454 else
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455 buf->st_mode = __stat_mode_CHR;
115
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456
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457 buf->st_ino = (ino_t)fp->f_data; // map dev handle to inode
1977
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458 buf->st_dev = 0; //(dev_t)fp->f_data; // same with dev id
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459 buf->st_nlink = 1;
115
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460 buf->st_uid = 0;
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461 buf->st_gid = 0;
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462 buf->st_size = 0;
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463 buf->st_atime = 0;
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464 buf->st_mtime = 0;
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465 buf->st_ctime = 0;
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466
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467 return ENOERR;
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468 }
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469
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470 // -------------------------------------------------------------------------
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471
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472 static int dev_fo_getinfo (struct CYG_FILE_TAG *fp, int key, void *buf, int len )
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473 {
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474 Cyg_ErrNo err = 0;
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475 cyg_uint32 ll = len;
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476
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477 err = cyg_io_get_config( (cyg_io_handle_t)fp->f_data, key, buf, &ll );
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478
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479 return -err;
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480 }
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481
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482 // -------------------------------------------------------------------------
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483
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484 static int dev_fo_setinfo (struct CYG_FILE_TAG *fp, int key, void *buf, int len )
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485 {
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486 Cyg_ErrNo err = 0;
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487 cyg_uint32 ll = len;
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488
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489 err = cyg_io_set_config( (cyg_io_handle_t)fp->f_data, key, buf, &ll );
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490
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491 return -err;
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492 }
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493
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494 // -------------------------------------------------------------------------
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495 // EOF devfs.cxx