root/init/main.c

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DEFINITIONS

This source file includes following definitions.
  1. get_options
  2. profile_setup
  3. ramdisk_start_setup
  4. load_ramdisk
  5. prompt_ramdisk
  6. checksetup
  7. calibrate_delay
  8. parse_options
  9. cpu_idle
  10. start_secondary
  11. smp_init
  12. smp_begin
  13. start_kernel
  14. printf
  15. do_rc
  16. do_shell
  17. init

   1 /*
   2  *  linux/init/main.c
   3  *
   4  *  Copyright (C) 1991, 1992  Linus Torvalds
   5  *
   6  *  GK 2/5/95  -  Changed to support mounting root fs via NFS
   7  */
   8 
   9 #define __KERNEL_SYSCALLS__
  10 #include <stdarg.h>
  11 
  12 #include <asm/system.h>
  13 #include <asm/io.h>
  14 
  15 #include <linux/types.h>
  16 #include <linux/fcntl.h>
  17 #include <linux/config.h>
  18 #include <linux/sched.h>
  19 #include <linux/tty.h>
  20 #include <linux/head.h>
  21 #include <linux/unistd.h>
  22 #include <linux/string.h>
  23 #include <linux/timer.h>
  24 #include <linux/fs.h>
  25 #include <linux/ctype.h>
  26 #include <linux/delay.h>
  27 #include <linux/utsname.h>
  28 #include <linux/ioport.h>
  29 #include <linux/hdreg.h>
  30 #include <linux/mm.h>
  31 #include <linux/major.h>
  32 #ifdef CONFIG_APM
  33 #include <linux/apm_bios.h>
  34 #endif
  35 
  36 #include <asm/bugs.h>
  37 
  38 extern char _stext, _etext;
  39 extern char *linux_banner;
  40 
  41 static char printbuf[1024];
  42 
  43 extern int console_loglevel;
  44 
  45 static int init(void *);
  46 extern int bdflush(void *);
  47 extern int kswapd(void *);
  48 
  49 extern void init_IRQ(void);
  50 extern void init_modules(void);
  51 extern long console_init(long, long);
  52 extern long kmalloc_init(long,long);
  53 extern void sock_init(void);
  54 extern long pci_init(long, long);
  55 extern void sysctl_init(void);
  56 
  57 extern void swap_setup(char *str, int *ints);
  58 extern void buff_setup(char *str, int *ints);
  59 extern void panic_setup(char *str, int *ints);
  60 extern void bmouse_setup(char *str, int *ints);
  61 extern void eth_setup(char *str, int *ints);
  62 extern void xd_setup(char *str, int *ints);
  63 extern void floppy_setup(char *str, int *ints);
  64 extern void st_setup(char *str, int *ints);
  65 extern void st0x_setup(char *str, int *ints);
  66 extern void advansys_setup(char *str, int *ints);
  67 extern void tmc8xx_setup(char *str, int *ints);
  68 extern void t128_setup(char *str, int *ints);
  69 extern void pas16_setup(char *str, int *ints);
  70 extern void generic_NCR5380_setup(char *str, int *intr);
  71 extern void generic_NCR53C400_setup(char *str, int *intr);
  72 extern void aha152x_setup(char *str, int *ints);
  73 extern void aha1542_setup(char *str, int *ints);
  74 extern void aic7xxx_setup(char *str, int *ints);
  75 extern void AM53C974_setup(char *str, int *ints);
  76 extern void BusLogic_Setup(char *str, int *ints);
  77 extern void fdomain_setup(char *str, int *ints);
  78 extern void NCR53c406a_setup(char *str, int *ints);
  79 extern void scsi_luns_setup(char *str, int *ints);
  80 extern void sound_setup(char *str, int *ints);
  81 #ifdef CONFIG_CDU31A
  82 extern void cdu31a_setup(char *str, int *ints);
  83 #endif CONFIG_CDU31A
  84 #ifdef CONFIG_MCD
  85 extern void mcd_setup(char *str, int *ints);
  86 #endif CONFIG_MCD
  87 #ifdef CONFIG_MCDX
  88 extern void mcdx_setup(char *str, int *ints);
  89 #endif CONFIG_MCDX
  90 #ifdef CONFIG_SBPCD
  91 extern void sbpcd_setup(char *str, int *ints);
  92 #endif CONFIG_SBPCD
  93 #ifdef CONFIG_AZTCD
  94 extern void aztcd_setup(char *str, int *ints);
  95 #endif CONFIG_AZTCD
  96 #ifdef CONFIG_CDU535
  97 extern void sonycd535_setup(char *str, int *ints);
  98 #endif CONFIG_CDU535
  99 #ifdef CONFIG_GSCD
 100 extern void gscd_setup(char *str, int *ints);
 101 #endif CONFIG_GSCD
 102 #ifdef CONFIG_CM206
 103 extern void cm206_setup(char *str, int *ints);
 104 #endif CONFIG_CM206
 105 #ifdef CONFIG_OPTCD
 106 extern void optcd_setup(char *str, int *ints);
 107 #endif CONFIG_OPTCD
 108 #ifdef CONFIG_SJCD
 109 extern void sjcd_setup(char *str, int *ints);
 110 #endif CONFIG_SJCD
 111 #ifdef CONFIG_ISP16_CDI
 112 extern void isp16_setup(char *str, int *ints);
 113 #endif CONFIG_ISP16_CDI
 114 #ifdef CONFIG_BLK_DEV_RAM
 115 static void ramdisk_start_setup(char *str, int *ints);
 116 static void load_ramdisk(char *str, int *ints);
 117 static void prompt_ramdisk(char *str, int *ints);
 118 #endif CONFIG_BLK_DEV_RAM
 119 
 120 #if defined(CONFIG_SYSVIPC) || defined(CONFIG_KERNELD)
 121 extern void ipc_init(void);
 122 #endif
 123 
 124 /*
 125  * Boot command-line arguments
 126  */
 127 #define MAX_INIT_ARGS 8
 128 #define MAX_INIT_ENVS 8
 129 
 130 extern void time_init(void);
 131 
 132 static unsigned long memory_start = 0;
 133 static unsigned long memory_end = 0;
 134 
 135 int rows, cols;
 136 
 137 #ifdef CONFIG_BLK_DEV_RAM
 138 extern int rd_doload;           /* 1 = load ramdisk, 0 = don't load */
 139 extern int rd_prompt;           /* 1 = prompt for ramdisk, 0 = don't prompt */
 140 extern int rd_image_start;      /* starting block # of image */
 141 #endif
 142 
 143 int root_mountflags = MS_RDONLY;
 144 char *execute_command = 0;
 145 
 146 #ifdef CONFIG_ROOT_NFS
 147 char nfs_root_name[256] = { NFS_ROOT };
 148 char nfs_root_addrs[128] = { "" };
 149 #endif
 150 
 151 extern void dquot_init(void);
 152 
 153 static char * argv_init[MAX_INIT_ARGS+2] = { "init", NULL, };
 154 static char * envp_init[MAX_INIT_ENVS+2] = { "HOME=/", "TERM=linux", NULL, };
 155 
 156 static char * argv_rc[] = { "/bin/sh", NULL };
 157 static char * envp_rc[] = { "HOME=/", "TERM=linux", NULL };
 158 
 159 static char * argv[] = { "-/bin/sh",NULL };
 160 static char * envp[] = { "HOME=/usr/root", "TERM=linux", NULL };
 161 
 162 char *get_options(char *str, int *ints)
     /* [previous][next][first][last][top][bottom][index][help] */
 163 {
 164         char *cur = str;
 165         int i=1;
 166 
 167         while (cur && isdigit(*cur) && i <= 10) {
 168                 ints[i++] = simple_strtoul(cur,NULL,0);
 169                 if ((cur = strchr(cur,',')) != NULL)
 170                         cur++;
 171         }
 172         ints[0] = i-1;
 173         return(cur);
 174 }
 175 
 176 static void profile_setup(char *str, int *ints)
     /* [previous][next][first][last][top][bottom][index][help] */
 177 {
 178         if (ints[0] > 0)
 179                 prof_shift = (unsigned long) ints[1];
 180         else
 181 #ifdef CONFIG_PROFILE_SHIFT
 182                 prof_shift = CONFIG_PROFILE_SHIFT;
 183 #else
 184                 prof_shift = 2;
 185 #endif
 186 }
 187 
 188 struct {
 189         const char *str;
 190         void (*setup_func)(char *, int *);
 191 } bootsetups[] = {
 192         { "reserve=", reserve_setup },
 193         { "profile=", profile_setup },
 194 #ifdef CONFIG_BLK_DEV_RAM
 195         { "ramdisk_start=", ramdisk_start_setup },
 196         { "load_ramdisk=", load_ramdisk },
 197         { "prompt_ramdisk=", prompt_ramdisk },
 198 #endif
 199         { "swap=", swap_setup },
 200         { "buff=", buff_setup },
 201         { "panic=", panic_setup },
 202 #ifdef CONFIG_BUGi386
 203         { "no-hlt", no_halt },
 204         { "no387", no_387 },
 205 #endif
 206 #ifdef CONFIG_INET
 207         { "ether=", eth_setup },
 208 #endif
 209 #ifdef CONFIG_SCSI
 210         { "max_scsi_luns=", scsi_luns_setup },
 211 #endif
 212 #ifdef CONFIG_SCSI_ADVANSYS
 213         { "advansys=", advansys_setup },
 214 #endif
 215 #if defined(CONFIG_BLK_DEV_HD)
 216         { "hd=", hd_setup },
 217 #endif
 218 #ifdef CONFIG_CHR_DEV_ST
 219         { "st=", st_setup },
 220 #endif
 221 #ifdef CONFIG_BUSMOUSE
 222         { "bmouse=", bmouse_setup },
 223 #endif
 224 #ifdef CONFIG_SCSI_SEAGATE
 225         { "st0x=", st0x_setup },
 226         { "tmc8xx=", tmc8xx_setup },
 227 #endif
 228 #ifdef CONFIG_SCSI_T128
 229         { "t128=", t128_setup },
 230 #endif
 231 #ifdef CONFIG_SCSI_PAS16
 232         { "pas16=", pas16_setup },
 233 #endif
 234 #ifdef CONFIG_SCSI_GENERIC_NCR5380
 235         { "ncr5380=", generic_NCR5380_setup },
 236         { "ncr53c400=", generic_NCR53C400_setup },
 237 #endif
 238 #ifdef CONFIG_SCSI_AHA152X
 239         { "aha152x=", aha152x_setup},
 240 #endif
 241 #ifdef CONFIG_SCSI_AHA1542
 242         { "aha1542=", aha1542_setup},
 243 #endif
 244 #ifdef CONFIG_SCSI_AIC7XXX
 245         { "aic7xxx=", aic7xxx_setup},
 246 #endif
 247 #ifdef CONFIG_SCSI_BUSLOGIC
 248         { "BusLogic=", BusLogic_Setup},
 249 #endif
 250 #ifdef CONFIG_SCSI_AM53C974
 251         { "AM53C974=", AM53C974_setup},
 252 #endif
 253 #ifdef CONFIG_SCSI_NCR53C406A
 254         { "ncr53c406a=", NCR53c406a_setup},
 255 #endif
 256 #ifdef CONFIG_SCSI_FUTURE_DOMAIN
 257         { "fdomain=", fdomain_setup},
 258 #endif
 259 #ifdef CONFIG_BLK_DEV_XD
 260         { "xd=", xd_setup },
 261 #endif
 262 #ifdef CONFIG_BLK_DEV_FD
 263         { "floppy=", floppy_setup },
 264 #endif
 265 #ifdef CONFIG_CDU31A
 266         { "cdu31a=", cdu31a_setup },
 267 #endif CONFIG_CDU31A
 268 #ifdef CONFIG_MCD
 269         { "mcd=", mcd_setup },
 270 #endif CONFIG_MCD
 271 #ifdef CONFIG_MCDX
 272         { "mcdx=", mcdx_setup },
 273 #endif CONFIG_MCDX
 274 #ifdef CONFIG_SBPCD
 275         { "sbpcd=", sbpcd_setup },
 276 #endif CONFIG_SBPCD
 277 #ifdef CONFIG_AZTCD
 278         { "aztcd=", aztcd_setup },
 279 #endif CONFIG_AZTCD
 280 #ifdef CONFIG_CDU535
 281         { "sonycd535=", sonycd535_setup },
 282 #endif CONFIG_CDU535
 283 #ifdef CONFIG_GSCD
 284         { "gscd=", gscd_setup },
 285 #endif CONFIG_GSCD
 286 #ifdef CONFIG_CM206
 287         { "cm206=", cm206_setup },
 288 #endif CONFIG_CM206
 289 #ifdef CONFIG_OPTCD
 290         { "optcd=", optcd_setup },
 291 #endif CONFIG_OPTCD
 292 #ifdef CONFIG_SJCD
 293         { "sjcd=", sjcd_setup },
 294 #endif CONFIG_SJCD
 295 #ifdef CONFIG_ISP16_CDI
 296         { "isp16=", isp16_setup },
 297 #endif CONFIG_ISP16_CDI
 298 #ifdef CONFIG_SOUND
 299         { "sound=", sound_setup },
 300 #endif
 301         { 0, 0 }
 302 };
 303 
 304 #ifdef CONFIG_BLK_DEV_RAM
 305 static void ramdisk_start_setup(char *str, int *ints)
     /* [previous][next][first][last][top][bottom][index][help] */
 306 {
 307    if (ints[0] > 0 && ints[1] >= 0)
 308       rd_image_start = ints[1];
 309 }
 310 
 311 static void load_ramdisk(char *str, int *ints)
     /* [previous][next][first][last][top][bottom][index][help] */
 312 {
 313    if (ints[0] > 0 && ints[1] >= 0)
 314       rd_doload = ints[1] & 1;
 315 }
 316 
 317 static void prompt_ramdisk(char *str, int *ints)
     /* [previous][next][first][last][top][bottom][index][help] */
 318 {
 319    if (ints[0] > 0 && ints[1] >= 0)
 320       rd_prompt = ints[1] & 1;
 321 }
 322 #endif
 323 
 324 static int checksetup(char *line)
     /* [previous][next][first][last][top][bottom][index][help] */
 325 {
 326         int i = 0;
 327         int ints[11];
 328 
 329 #ifdef CONFIG_BLK_DEV_IDE
 330         /* ide driver needs the basic string, rather than pre-processed values */
 331         if (!strncmp(line,"ide",3) || (!strncmp(line,"hd",2) && line[2] != '=')) {
 332                 ide_setup(line);
 333                 return 1;
 334         }
 335 #endif
 336         while (bootsetups[i].str) {
 337                 int n = strlen(bootsetups[i].str);
 338                 if (!strncmp(line,bootsetups[i].str,n)) {
 339                         bootsetups[i].setup_func(get_options(line+n,ints), ints);
 340                         return 1;
 341                 }
 342                 i++;
 343         }
 344         return 0;
 345 }
 346 
 347 /* this should be approx 2 Bo*oMips to start (note initial shift), and will
 348    still work even if initally too large, it will just take slightly longer */
 349 unsigned long loops_per_sec = (1<<12);
 350 
 351 /* This is the number of bits of precision for the loops_per_second.  Each
 352    bit takes on average 1.5/HZ seconds.  This (like the original) is a little
 353    better than 1% */
 354 #define LPS_PREC 8
 355 
 356 void calibrate_delay(void)
     /* [previous][next][first][last][top][bottom][index][help] */
 357 {
 358         int ticks;
 359         int loopbit;
 360         int lps_precision = LPS_PREC;
 361 
 362         loops_per_sec = (1<<12);
 363 
 364         printk("Calibrating delay loop.. ");
 365         while (loops_per_sec <<= 1) {
 366                 /* wait for "start of" clock tick */
 367                 ticks = jiffies;
 368                 while (ticks == jiffies)
 369                         /* nothing */;
 370                 /* Go .. */
 371                 ticks = jiffies;
 372                 __delay(loops_per_sec);
 373                 ticks = jiffies - ticks;
 374                 if (ticks)
 375                         break;
 376                 }
 377 
 378 /* Do a binary approximation to get loops_per_second set to equal one clock
 379    (up to lps_precision bits) */
 380         loops_per_sec >>= 1;
 381         loopbit = loops_per_sec;
 382         while ( lps_precision-- && (loopbit >>= 1) ) {
 383                 loops_per_sec |= loopbit;
 384                 ticks = jiffies;
 385                 while (ticks == jiffies);
 386                 ticks = jiffies;
 387                 __delay(loops_per_sec);
 388                 if (jiffies != ticks)   /* longer than 1 tick */
 389                         loops_per_sec &= ~loopbit;
 390         }
 391 
 392 /* finally, adjust loops per second in terms of seconds instead of clocks */    
 393         loops_per_sec *= HZ;
 394 /* Round the value and print it */      
 395         printk("ok - %lu.%02lu BogoMIPS\n",
 396                 (loops_per_sec+2500)/500000,
 397                 ((loops_per_sec+2500)/5000) % 100);
 398 }
 399 
 400 /*
 401  * This is a simple kernel command line parsing function: it parses
 402  * the command line, and fills in the arguments/environment to init
 403  * as appropriate. Any cmd-line option is taken to be an environment
 404  * variable if it contains the character '='.
 405  *
 406  *
 407  * This routine also checks for options meant for the kernel.
 408  * These options are not given to init - they are for internal kernel use only.
 409  */
 410 static void parse_options(char *line)
     /* [previous][next][first][last][top][bottom][index][help] */
 411 {
 412         char *next;
 413         char *devnames[] = { "nfs", "hda", "hdb", "hdc", "hdd", "sda", "sdb",
 414                 "sdc", "sdd", "sde", "fd", "xda", "xdb", NULL };
 415         int devnums[]    = { 0x0FF, 0x300, 0x340, 0x1600, 0x1640, 0x800,
 416                 0x810, 0x820, 0x830, 0x840, 0x200, 0xD00, 0xD40, 0};
 417         int args, envs;
 418         if (!*line)
 419                 return;
 420         args = 0;
 421         envs = 1;       /* TERM is set to 'linux' by default */
 422         next = line;
 423         while ((line = next) != NULL) {
 424                 if ((next = strchr(line,' ')) != NULL)
 425                         *next++ = 0;
 426                 /*
 427                  * check for kernel options first..
 428                  */
 429                 if (!strncmp(line,"root=",5)) {
 430                         int n;
 431                         line += 5;
 432                         if (strncmp(line,"/dev/",5)) {
 433                                 ROOT_DEV = to_kdev_t(
 434                                              simple_strtoul(line,NULL,16));
 435                                 continue;
 436                         }
 437                         line += 5;
 438                         for (n = 0 ; devnames[n] ; n++) {
 439                                 int len = strlen(devnames[n]);
 440                                 if (!strncmp(line,devnames[n],len)) {
 441                                         ROOT_DEV = to_kdev_t(devnums[n]+
 442                                              simple_strtoul(line+len,NULL,0));
 443                                         break;
 444                                 }
 445                         }
 446                         continue;
 447                 }
 448 #ifdef CONFIG_ROOT_NFS
 449                 if (!strncmp(line, "nfsroot=", 8)) {
 450                         int n;
 451                         line += 8;
 452                         ROOT_DEV = MKDEV(UNNAMED_MAJOR, 255);
 453                         if (line[0] == '/' || (line[0] >= '0' && line[0] <= '9')) {
 454                                 strncpy(nfs_root_name, line, sizeof(nfs_root_name));
 455                                 nfs_root_name[sizeof(nfs_root_name)-1] = '\0';
 456                                 continue;
 457                         }
 458                         n = strlen(line) + strlen(NFS_ROOT);
 459                         if (n >= sizeof(nfs_root_name))
 460                                 line[sizeof(nfs_root_name) - strlen(NFS_ROOT) - 1] = '\0';
 461                         sprintf(nfs_root_name, NFS_ROOT, line);
 462                         continue;
 463                 }
 464                 if (!strncmp(line, "nfsaddrs=", 9)) {
 465                         line += 9;
 466                         strncpy(nfs_root_addrs, line, sizeof(nfs_root_addrs));
 467                         nfs_root_addrs[sizeof(nfs_root_addrs)-1] = '\0';
 468                         continue;
 469                 }
 470 #endif
 471                 if (!strcmp(line,"ro")) {
 472                         root_mountflags |= MS_RDONLY;
 473                         continue;
 474                 }
 475                 if (!strcmp(line,"rw")) {
 476                         root_mountflags &= ~MS_RDONLY;
 477                         continue;
 478                 }
 479                 if (!strcmp(line,"debug")) {
 480                         console_loglevel = 10;
 481                         continue;
 482                 }
 483                 if (!strncmp(line,"init=",5)) {
 484                         line += 5;
 485                         execute_command = line;
 486                         continue;
 487                 }
 488                 if (checksetup(line))
 489                         continue;
 490                 /*
 491                  * Then check if it's an environment variable or
 492                  * an option.
 493                  */
 494                 if (strchr(line,'=')) {
 495                         if (envs >= MAX_INIT_ENVS)
 496                                 break;
 497                         envp_init[++envs] = line;
 498                 } else {
 499                         if (args >= MAX_INIT_ARGS)
 500                                 break;
 501                         argv_init[++args] = line;
 502                 }
 503         }
 504         argv_init[args+1] = NULL;
 505         envp_init[envs+1] = NULL;
 506 }
 507 
 508 
 509 extern void setup_arch(char **, unsigned long *, unsigned long *);
 510 extern void arch_syms_export(void);
 511 
 512 #ifndef __SMP__
 513 
 514 /*
 515  *      Uniprocessor idle thread
 516  */
 517  
 518 int cpu_idle(void *unused)
     /* [previous][next][first][last][top][bottom][index][help] */
 519 {
 520         for(;;)
 521                 idle();
 522 }
 523 
 524 #else
 525 
 526 /*
 527  *      Multiprocessor idle thread is in arch/...
 528  */
 529  
 530 extern int cpu_idle(void * unused);
 531 
 532 /*
 533  *      Activate a secondary processor.
 534  */
 535  
 536 asmlinkage void start_secondary(void)
     /* [previous][next][first][last][top][bottom][index][help] */
 537 {
 538         trap_init();
 539         init_IRQ();
 540         smp_callin();
 541         cpu_idle(NULL);
 542 }
 543 
 544 
 545 
 546 /*
 547  *      Called by CPU#0 to activate the rest.
 548  */
 549  
 550 static void smp_init(void)
     /* [previous][next][first][last][top][bottom][index][help] */
 551 {
 552         int i=0;
 553         smp_boot_cpus();
 554         
 555         /*
 556          *      Create the slave init tasks as sharing pid 0.
 557          */
 558 
 559         for(i=1;i<smp_num_cpus;i++)
 560         {
 561                 /*
 562                  *      We use kernel_thread for the idlers which are
 563                  *      unlocked tasks running in kernel space.
 564                  */
 565                 kernel_thread(cpu_idle, NULL, CLONE_PID);
 566                 /*
 567                  *      Assume linear processor numbering
 568                  */
 569                 current_set[i]=task[i];
 570                 current_set[i]->processor=i;
 571         }
 572 }               
 573 
 574 /*
 575  *      The autoprobe routines assume CPU#0 on the i386
 576  *      so we don't actually set the game in motion until
 577  *      they are finished.
 578  */
 579  
 580 static void smp_begin(void)
     /* [previous][next][first][last][top][bottom][index][help] */
 581 {
 582         smp_threads_ready=1;
 583         smp_commence();
 584 }
 585         
 586 #endif
 587 
 588 /*
 589  *      Activate the first processor.
 590  */
 591  
 592 asmlinkage void start_kernel(void)
     /* [previous][next][first][last][top][bottom][index][help] */
 593 {
 594         char * command_line;
 595 
 596 /*
 597  *      This little check will move.
 598  */
 599 
 600 #ifdef __SMP__
 601         static int first_cpu=1;
 602         
 603         if(!first_cpu)
 604                 start_secondary();
 605         first_cpu=0;
 606         
 607 #endif  
 608 /*
 609  * Interrupts are still disabled. Do necessary setups, then
 610  * enable them
 611  */
 612         setup_arch(&command_line, &memory_start, &memory_end);
 613         memory_start = paging_init(memory_start,memory_end);
 614         trap_init();
 615         init_IRQ();
 616         sched_init();
 617         time_init();
 618         parse_options(command_line);
 619 #ifdef CONFIG_MODULES
 620         init_modules();
 621 #endif
 622 #ifdef CONFIG_PROFILE
 623         if (!prof_shift)
 624 #ifdef CONFIG_PROFILE_SHIFT
 625                 prof_shift = CONFIG_PROFILE_SHIFT;
 626 #else
 627                 prof_shift = 2;
 628 #endif
 629 #endif
 630         if (prof_shift) {
 631                 prof_buffer = (unsigned int *) memory_start;
 632                 /* only text is profiled */
 633                 prof_len = (unsigned long) &_etext - (unsigned long) &_stext;
 634                 prof_len >>= prof_shift;
 635                 memory_start += prof_len * sizeof(unsigned int);
 636         }
 637         memory_start = console_init(memory_start,memory_end);
 638 #ifdef CONFIG_PCI
 639         memory_start = pci_init(memory_start,memory_end);
 640 #endif
 641         memory_start = kmalloc_init(memory_start,memory_end);
 642         sti();
 643         calibrate_delay();
 644         memory_start = inode_init(memory_start,memory_end);
 645         memory_start = file_table_init(memory_start,memory_end);
 646         memory_start = name_cache_init(memory_start,memory_end);
 647         mem_init(memory_start,memory_end);
 648         buffer_init();
 649         sock_init();
 650 #if defined(CONFIG_SYSVIPC) || defined(CONFIG_KERNELD)
 651         ipc_init();
 652 #endif
 653 #ifdef CONFIG_APM
 654         apm_bios_init();
 655 #endif
 656         dquot_init();
 657         arch_syms_export();
 658         sti();
 659         check_bugs();
 660 
 661         printk(linux_banner);
 662 #ifdef __SMP__
 663         smp_init();
 664 #endif
 665         sysctl_init();
 666         /* 
 667          *      We count on the initial thread going ok 
 668          *      Like idlers init is an unlocked kernel thread, which will
 669          *      make syscalls (and thus be locked).
 670          */
 671         kernel_thread(init, NULL, 0);
 672 /*
 673  * task[0] is meant to be used as an "idle" task: it may not sleep, but
 674  * it might do some general things like count free pages or it could be
 675  * used to implement a reasonable LRU algorithm for the paging routines:
 676  * anything that can be useful, but shouldn't take time from the real
 677  * processes.
 678  *
 679  * Right now task[0] just does a infinite idle loop.
 680  */
 681         cpu_idle(NULL);
 682 }
 683 
 684 static int printf(const char *fmt, ...)
     /* [previous][next][first][last][top][bottom][index][help] */
 685 {
 686         va_list args;
 687         int i;
 688 
 689         va_start(args, fmt);
 690         write(1,printbuf,i=vsprintf(printbuf, fmt, args));
 691         va_end(args);
 692         return i;
 693 }
 694 
 695 static int do_rc(void * rc)
     /* [previous][next][first][last][top][bottom][index][help] */
 696 {
 697         close(0);
 698         if (open(rc,O_RDONLY,0))
 699                 return -1;
 700         return execve("/bin/sh", argv_rc, envp_rc);
 701 }
 702 
 703 static int do_shell(void * shell)
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 704 {
 705         close(0);close(1);close(2);
 706         setsid();
 707         (void) open("/dev/tty1",O_RDWR,0);
 708         (void) dup(0);
 709         (void) dup(0);
 710         return execve(shell, argv, envp);
 711 }
 712 
 713 static int init(void * unused)
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 714 {
 715         int pid,i;
 716 
 717         /* Launch bdflush from here, instead of the old syscall way. */
 718         kernel_thread(bdflush, NULL, 0);
 719         /* Start the background pageout daemon. */
 720         kernel_thread(kswapd, NULL, 0);
 721 
 722         setup();
 723 
 724 #ifdef __SMP__
 725         /*
 726          *      With the devices probed and setup we can
 727          *      now enter SMP mode.
 728          */
 729         
 730         smp_begin();
 731 #endif  
 732 
 733         #ifdef CONFIG_UMSDOS_FS
 734         {
 735                 /*
 736                         When mounting a umsdos fs as root, we detect
 737                         the pseudo_root (/linux) and initialise it here.
 738                         pseudo_root is defined in fs/umsdos/inode.c
 739                 */
 740                 extern struct inode *pseudo_root;
 741                 if (pseudo_root != NULL){
 742                         current->fs->root = pseudo_root;
 743                         current->fs->pwd  = pseudo_root;
 744                 }
 745         }
 746         #endif
 747 
 748         (void) open("/dev/tty1",O_RDWR,0);
 749         (void) dup(0);
 750         (void) dup(0);
 751 
 752         if (!execute_command) {
 753                 execve("/etc/init",argv_init,envp_init);
 754                 execve("/bin/init",argv_init,envp_init);
 755                 execve("/sbin/init",argv_init,envp_init);
 756                 /* if this fails, fall through to original stuff */
 757 
 758                 pid = kernel_thread(do_rc, "/etc/rc", SIGCHLD);
 759                 if (pid>0)
 760                         while (pid != wait(&i))
 761                                 /* nothing */;
 762                 }
 763 
 764         while (1) {
 765                 pid = kernel_thread(do_shell,
 766                         execute_command ? execute_command : "/bin/sh",
 767                         SIGCHLD);
 768                 if (pid < 0) {
 769                         printf("Fork failed in init\n\r");
 770                         continue;
 771                 }
 772                 while (1)
 773                         if (pid == wait(&i))
 774                                 break;
 775                 printf("\n\rchild %d died with code %04x\n\r",pid,i);
 776                 sync();
 777         }
 778         return -1;
 779 }

/* [previous][next][first][last][top][bottom][index][help] */