Kernel/system.c

   1 /*
   2  * Acess 2
   3  * Architecture Independent System Init
   4  * system.c
   5  */
   6 #define DEBUG   0
   7 #include <acess.h>
   8
   9 // === TYPES ===
  10 typedef struct
  11 {
  12          int    TrueLine;
  13          int    nParts;
  14         char    **Parts;
  15 }       tConfigLine;
  16 typedef struct
  17 {
  18          int    nLines;
  19         tConfigLine     Lines[];
  20 }       tConfigFile;
  21
  22 // === IMPORTS ===
  23 extern int      Modules_LoadBuiltins();
  24 //extern int    PCI_Install();
  25 extern void     DMA_Install();
  26 extern void     Debug_SetKTerminal(char *File);
  27 extern void     StartupPrint(char *Str);
  28
  29 // === PROTOTYPES ===
  30 void    System_Init(char *ArgString);
  31 void    System_ParseCommandLine(char *ArgString);
  32 void    System_ParseVFS(char *Arg);
  33 void    System_ParseSetting(char *Arg);
  34 void    System_ExecuteScript();
  35 tConfigFile     *System_Int_ParseFile(char *File);
  36
  37 // === GLOBALS ===
  38 char    *gsConfigScript = "/Acess/Conf/BootConf.cfg";
  39
  40 // === CODE ===
  41 void System_Init(char *ArgString)
  42 {
  43         // Set the debug to be echoed to the terminal
  44         StartupPrint("Kernel now echoes to VT7 (Ctrl-Alt-F8)");
  45         Debug_SetKTerminal("/Devices/VTerm/7");
  46
  47         // - Parse Kernel's Command Line
  48         System_ParseCommandLine(ArgString);
  49
  50         // - Execute the Config Script
  51         Log("Executing config script...");
  52         System_ExecuteScript();
  53 }
  54
  55 /**
  56  * \fn void System_ParseCommandLine(char *ArgString)
  57  * \brief Parses the kernel's command line and sets the environment
  58  */
  59 void System_ParseCommandLine(char *ArgString)
  60 {
  61         char    *argv[32];
  62          int    argc;
  63          int    i;
  64         char    *str;
  65
  66         Log("Kernel Command Line: \"%s\"", ArgString);
  67
  68         // --- Get Arguments ---
  69         str = ArgString;
  70         for( argc = 0; argc < 32; argc++ )
  71         {
  72                 // Eat Whitespace
  73                 while(*str == ' ')      str++;
  74                 // Check for the end of the string
  75                 if(*str == '\0') {      argc--; break;}
  76                 argv[argc] = str;
  77                 while(*str && *str != ' ')
  78                 {
  79                         /*if(*str == '"') {
  80                                 while(*str && !(*str == '"' && str[-1] != '\\'))
  81                                         str ++;
  82                         }*/
  83                         str++;
  84                 }
  85                 if(*str == '\0')        break;  // Check for EOS
  86                 *str = '\0';    // Cap off argument string
  87                 str ++; // and increment the string pointer
  88         }
  89         if(argc < 32)
  90                 argc ++;        // Count last argument
  91
  92         // --- Parse Arguments ---
  93         for( i = 1; i < argc; i++ )
  94         {
  95                 if( argv[i][0] == '/' )
  96                         System_ParseVFS( argv[i] );
  97                 else
  98                         System_ParseSetting( argv[i] );
  99         }
 100 }
 101
 102 /**
 103  * \fn void System_ParseVFS(char *Arg)
 104  */
 105 void System_ParseVFS(char *Arg)
 106 {
 107         char    *value;
 108          int    fd;
 109
 110         value = Arg;
 111         // Search for the '=' token
 112         while( *value && *value != '=' )
 113                 value++;
 114
 115         // Check if the equals was found
 116         if( *value == '\0' ) {
 117                 Warning("Expected '=' in the string '%s'", Arg);
 118                 return ;
 119         }
 120
 121         // Edit string
 122         *value = '\0';  value ++;
 123
 124         // Check assignment type
 125         // - Symbolic Link <link>=<destination>
 126         if(value[0] == '/')
 127         {
 128                 Log("Symbolic link '%s' pointing to '%s'", Arg, value);
 129                 VFS_Symlink(Arg, value);
 130         }
 131         // - Mount <mountpoint>=<fs>:<device>
 132         else
 133         {
 134                 char    *dev = value;
 135                 // Find colon
 136                 while(*dev && *dev != ':')      dev++;
 137                 if(*dev) {
 138                         *dev = '\0';
 139                         dev++;  // Eat ':'
 140                 }
 141                 // Create Mountpoint
 142                 if( (fd = VFS_Open(Arg, 0)) == -1 ) {
 143                         Log("Creating directory '%s'", Arg, value);
 144                         VFS_MkDir( Arg );
 145                 } else {
 146                         VFS_Close(fd);
 147                 }
 148                 // Mount
 149                 Log("Mounting '%s' to '%s' ('%s')", dev, Arg, value);
 150                 VFS_Mount(dev, Arg, value, "");
 151         }
 152 }
 153
 154 /**
 155  * \fn void System_ParseSetting(char *Arg)
 156  */
 157 void System_ParseSetting(char *Arg)
 158 {
 159         char    *value;
 160         value = Arg;
 161
 162         // Search for the '=' token
 163         while( *value && *value != '=' )
 164                 value++;
 165
 166         // Check for boolean/flag (no '=')
 167         if(*value == '\0')
 168         {
 169                 //if(strcmp(Arg, "") == 0) {
 170                 //} else {
 171                         Warning("Kernel flag '%s' is not recognised", Arg);
 172                 //}
 173         }
 174         else
 175         {
 176                 *value = '\0';  // Remove '='
 177                 value ++;       // and eat it's position
 178
 179                 if(strcmp(Arg, "SCRIPT") == 0) {
 180                         Log("Config Script: '%s'", value);
 181                         gsConfigScript = value;
 182                 } else {
 183                         Warning("Kernel config setting '%s' is not recognised", Arg);
 184                 }
 185
 186         }
 187 }
 188
 189 /**
 190  * \fn void System_ExecuteScript()
 191  */
 192 void System_ExecuteScript()
 193 {
 194          int    fp;
 195          int    fLen = 0;
 196          int    i;
 197         char    *fData;
 198         tConfigFile     *file;
 199         tConfigLine     *line;
 200
 201         // Open Script
 202         fp = VFS_Open(gsConfigScript, VFS_OPENFLAG_READ);
 203         if(fp == -1) {
 204                 Warning("[CFG] Passed script '%s' does not exist", gsConfigScript);
 205                 return;
 206         }
 207
 208         // Read into memory buffer
 209         VFS_Seek(fp, 0, SEEK_END);
 210         fLen = VFS_Tell(fp);
 211         VFS_Seek(fp, 0, SEEK_SET);
 212         fData = malloc(fLen+1);
 213         VFS_Read(fp, fLen, fData);
 214         fData[fLen] = '\0';
 215         VFS_Close(fp);
 216
 217
 218
 219         // Parse File
 220         file = System_Int_ParseFile(fData);
 221
 222         // Parse each line
 223         for( i = 0; i < file->nLines; i++ )
 224         {
 225                 line = &file->Lines[i];
 226                 if( line->nParts == 0 ) continue;       // Skip blank
 227
 228                 // Mount Device
 229                 if( strcmp(line->Parts[0], "mount") == 0 )
 230                 {
 231                         if( line->nParts != 4 ) {
 232                                 Warning("Configuration command 'mount' requires 3 arguments, %i given",
 233                                         line->nParts-1);
 234                                 continue;
 235                         }
 236                         //Log("[CFG ] Mount '%s' to '%s' (%s)",
 237                         //      line->Parts[1], line->Parts[2], line->Parts[3]);
 238                         //! \todo Use an optional 4th argument for the options string
 239                         VFS_Mount(line->Parts[1], line->Parts[2], line->Parts[3], "");
 240                 }
 241                 // Load a Module
 242                 else if(strcmp(line->Parts[0], "module") == 0)
 243                 {
 244                         if( line->nParts < 2 || line->nParts > 3 ) {
 245                                 Warning("Configuration command 'module' requires 1 or 2 arguments, %i given",
 246                                         line->nParts-1);
 247                                 continue;
 248                         }
 249                         if( line->nParts == 3 )
 250                                 Module_LoadFile(line->Parts[1], line->Parts[2]);
 251                         else
 252                                 Module_LoadFile(line->Parts[1], "");
 253                 }
 254                 // Load a UDI Module
 255                 else if(strcmp(line->Parts[0], "udimod") == 0)
 256                 {
 257                         if( line->nParts != 2 ) {
 258                                 Warning("Configuration command 'udimod' requires 1 argument, %i given",
 259                                         line->nParts-1);
 260                                 continue;
 261                         }
 262                         Log("[CFG  ] Load UDI Module '%s'", line->Parts[1]);
 263                         Module_LoadFile(line->Parts[1], "");
 264                 }
 265                 // Load a EDI Module
 266                 else if(strcmp(line->Parts[0], "edimod") == 0)
 267                 {
 268                         if( line->nParts != 2 ) {
 269                                 Warning("Configuration command 'edimod' requires 1 argument, %i given",
 270                                         line->nParts-1);
 271                                 continue;
 272                         }
 273                         Log("[CFG  ] Load EDI Module '%s'", line->Parts[1]);
 274                         Module_LoadFile(line->Parts[1], "");
 275                 }
 276                 // Create a Symbolic Link
 277                 else if(strcmp(line->Parts[0], "symlink") == 0)
 278                 {
 279                         if( line->nParts != 3 ) {
 280                                 Warning("Configuration command 'symlink' requires 2 arguments, %i given",
 281                                         line->nParts-1);
 282                                 continue;
 283                         }
 284                         Log("[CFG  ] Symlink '%s' pointing to '%s'",
 285                                 line->Parts[1], line->Parts[2]);
 286                         VFS_Symlink(line->Parts[1], line->Parts[2]);
 287                 }
 288                 // Create a Directory
 289                 else if(strcmp(line->Parts[0], "mkdir") == 0)
 290                 {
 291                         if( line->nParts != 2 ) {
 292                                 Warning("Configuration command 'mkdir' requires 1 argument, %i given",
 293                                         line->nParts-1);
 294                                 continue;
 295                         }
 296                         Log("[CFG  ] New Directory '%s'", line->Parts[1]);
 297                         VFS_MkDir(line->Parts[1]);
 298                 }
 299                 // Spawn a process
 300                 else if(strcmp(line->Parts[0], "spawn") == 0)
 301                 {
 302                         if( line->nParts != 2 ) {
 303                                 Warning("Configuration command 'spawn' requires 1 argument, %i given",
 304                                         line->nParts-1);
 305                                 continue;
 306                         }
 307                         Log("[CFG  ] Starting '%s' as a new task", line->Parts[1]);
 308                         Proc_Spawn(line->Parts[1]);
 309                 }
 310                 else {
 311                         Warning("Unknown configuration command '%s' on line %i",
 312                                 line->Parts[0],
 313                                 line->TrueLine
 314                                 );
 315                 }
 316         }
 317
 318         // Clean up after ourselves
 319         for( i = 0; i < file->nLines; i++ ) {
 320                 if( file->Lines[i].nParts == 0 )        continue;       // Skip blank
 321                 free( file->Lines[i].Parts );
 322         }
 323         free( file );
 324         free( fData );
 325 }
 326
 327 /**
 328  * \brief Parses a config file
 329  * \param FileData      Read/Write buffer containing the config file data
 330  *                  (will be modified)
 331  * \return ::tConfigFile structure that represents the original contents
 332  *         of \a FileData
 333  */
 334 tConfigFile     *System_Int_ParseFile(char *FileData)
 335 {
 336         char    *ptr;
 337         char    *start;
 338          int    nLines = 1;
 339          int    i, j;
 340         tConfigFile     *ret;
 341
 342         ENTER("pFileData", FileData);
 343
 344         // Prescan and count the number of lines
 345         for(ptr = FileData; *ptr; ptr++)
 346         {
 347                 if(*ptr != '\n')        continue;
 348
 349                 if(ptr == FileData) {
 350                         nLines ++;
 351                         continue;
 352                 }
 353
 354                 // Escaped EOL
 355                 if(ptr[-1] == '\\')     continue;
 356
 357                 nLines ++;
 358         }
 359
 360         LOG("nLines = %i", nLines);
 361
 362         // Ok so we have `nLines` lines, now to allocate our return
 363         ret = malloc( sizeof(tConfigFile) + sizeof(tConfigLine)*nLines );
 364         ret->nLines = nLines;
 365
 366         // Read the file for real
 367         for(
 368                 ptr = FileData, i = 0;
 369                 *ptr;
 370                 i++
 371                 )
 372         {
 373                 start = ptr;
 374
 375                 ret->Lines[i].nParts = 0;
 376
 377                 // Count parts
 378                 for(;;)
 379                 {
 380                         // Read leading whitespace
 381                         while( *ptr == '\t' || *ptr == ' ' )    ptr++;
 382
 383                         // End of line/file
 384                         if( *ptr == '\0' || *ptr == '\n' ) {
 385                                 if(*ptr == '\n')        ptr ++;
 386                                 break;
 387                         }
 388                         // Comment
 389                         if( *ptr == '#' || *ptr == ';' ) {
 390                                 while( *ptr && *ptr != '\n' )   ptr ++;
 391                                 if(*ptr == '\n')        ptr ++;
 392                                 break;
 393                         }
 394
 395                         ret->Lines[i].nParts ++;
 396                         // Quoted
 397                         if( *ptr == '"' ) {
 398                                 ptr ++;
 399                                 while( *ptr && !(*ptr == '"' && ptr[-1] == '\\') && *ptr != '\n' )
 400                                         ptr++;
 401                                 continue;
 402                         }
 403                         // Unquoted
 404                         while( *ptr && !(*ptr == '\t' || *ptr == ' ') && *ptr != '\n' )
 405                                 ptr++;
 406                 }
 407
 408                 LOG("ret->Lines[%i].nParts = %i", i, ret->Lines[i].nParts);
 409
 410                 if( ret->Lines[i].nParts == 0 ) {
 411                         ret->Lines[i].Parts = NULL;
 412                         continue;
 413                 }
 414
 415                 // Allocate part list
 416                 ret->Lines[i].Parts = malloc( sizeof(char*) * ret->Lines[i].nParts );
 417
 418                 // Fill list
 419                 for( ptr = start, j = 0; ; j++ )
 420                 {
 421                         // Read leading whitespace
 422                         while( *ptr == '\t' || *ptr == ' ' )    ptr++;
 423
 424                         // End of line/file
 425                         if( *ptr == '\0' || *ptr == '\n' ) {
 426                                 if(*ptr == '\n')        ptr ++;
 427                                 break;
 428                         }
 429                         // Comment
 430                         if( *ptr == '#' || *ptr == ';' ) {
 431                                 while( *ptr && *ptr != '\n' )   ptr ++;
 432                                 if(*ptr == '\n')        ptr ++;
 433                                 break;
 434                         }
 435
 436                         ret->Lines[i].Parts[j] = ptr;
 437
 438                         // Quoted
 439                         if( *ptr == '"' ) {
 440                                 ptr ++;
 441                                 while( *ptr && !(*ptr == '"' && ptr[-1] == '\\') && *ptr != '\n' )
 442                                         ptr++;
 443                         }
 444                         // Unquoted
 445                         else {
 446                                 while( *ptr != '\t' && *ptr != ' ' && *ptr != '\n' )
 447                                         ptr++;
 448                         }
 449
 450                         // Break if we have reached NULL
 451                         if( *ptr == '\0' ) {
 452                                 LOG("ret->Lines[%i].Parts[%i] = '%s'", i, j, ret->Lines[i].Parts[j]);
 453                                 break;
 454                         }
 455                         if( *ptr == '\n' ) {
 456                                 *ptr = '\0';
 457                                 LOG("ret->Lines[%i].Parts[%i] = '%s'", i, j, ret->Lines[i].Parts[j]);
 458                                 ptr ++;
 459                                 break;
 460                         }
 461                         *ptr = '\0';    // Cap off string
 462                         LOG("ret->Lines[%i].Parts[%i] = '%s'", i, j, ret->Lines[i].Parts[j]);
 463                         ptr ++; // And increment for the next round
 464                 }
 465         }
 466
 467         LEAVE('p', ret);
 468         return ret;
 469 }