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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 | /* * linux/init/main.c * * Copyright (C) 1991, 1992 Linus Torvalds * * GK 2/5/95 - Changed to support mounting root fs via NFS * Added initrd & change_root: Werner Almesberger & Hans Lermen, Feb '96 * Moan early if gcc is old, avoiding bogus kernels - Paul Gortmaker, May '96 * Simplified starting of init: Michael A. Griffith <grif@acm.org> */ #define __KERNEL_SYSCALLS__ #include <linux/types.h> #include <linux/fcntl.h> #include <linux/config.h> #include <linux/sched.h> #include <linux/kernel.h> #include <linux/tty.h> #include <linux/head.h> #include <linux/unistd.h> #include <linux/string.h> #include <linux/timer.h> #include <linux/fs.h> #include <linux/ctype.h> #include <linux/delay.h> #include <linux/utsname.h> #include <linux/ioport.h> #include <linux/hdreg.h> #include <linux/mm.h> #include <linux/slab.h> #include <linux/major.h> #include <linux/blk.h> #ifdef CONFIG_ROOT_NFS #include <linux/nfs_fs.h> #endif #include <asm/system.h> #include <asm/io.h> #include <asm/bugs.h> #include <stdarg.h> /* * Versions of gcc older than that listed below may actually compile * and link okay, but the end product can have subtle run time bugs. * To avoid associated bogus bug reports, we flatly refuse to compile * with a gcc that is known to be too old from the very beginning. */ #if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 6) #error sorry, your GCC is too old. It builds incorrect kernels. #endif extern char _stext, _etext; extern char *linux_banner; extern int console_loglevel; static int init(void *); extern int bdflush(void *); extern int kswapd(void *); extern void init_IRQ(void); extern void init_modules(void); extern long console_init(long, long); extern long kmalloc_init(long,long); extern void sock_init(void); extern unsigned long pci_init(unsigned long, unsigned long); extern long mca_init(long, long); extern long sbus_init(long, long); extern void sysctl_init(void); extern void smp_setup(char *str, int *ints); extern void no_scroll(char *str, int *ints); extern void swap_setup(char *str, int *ints); extern void buff_setup(char *str, int *ints); extern void panic_setup(char *str, int *ints); extern void bmouse_setup(char *str, int *ints); extern void msmouse_setup(char *str, int *ints); extern void lp_setup(char *str, int *ints); extern void eth_setup(char *str, int *ints); extern void xd_setup(char *str, int *ints); #ifdef CONFIG_BLK_DEV_EZ extern void ez_setup(char *str, int *ints); #endif extern void floppy_setup(char *str, int *ints); extern void st_setup(char *str, int *ints); extern void st0x_setup(char *str, int *ints); extern void advansys_setup(char *str, int *ints); extern void tmc8xx_setup(char *str, int *ints); extern void t128_setup(char *str, int *ints); extern void pas16_setup(char *str, int *ints); extern void generic_NCR5380_setup(char *str, int *intr); extern void generic_NCR53C400_setup(char *str, int *intr); extern void aha152x_setup(char *str, int *ints); extern void aha1542_setup(char *str, int *ints); extern void aic7xxx_setup(char *str, int *ints); extern void AM53C974_setup(char *str, int *ints); extern void BusLogic_Setup(char *str, int *ints); extern void ncr53c8xx_setup(char *str, int *ints); extern void eata2x_setup(char *str, int *ints); extern void u14_34f_setup(char *str, int *ints); extern void fdomain_setup(char *str, int *ints); extern void ibmmca_scsi_setup(char *str, int *ints); extern void in2000_setup(char *str, int *ints); extern void NCR53c406a_setup(char *str, int *ints); extern void wd7000_setup(char *str, int *ints); extern void ppa_setup(char *str, int *ints); extern void scsi_luns_setup(char *str, int *ints); extern void sound_setup(char *str, int *ints); extern void reboot_setup(char *str, int *ints); extern void video_setup(char *str, int *ints); #ifdef CONFIG_CDU31A extern void cdu31a_setup(char *str, int *ints); #endif CONFIG_CDU31A #ifdef CONFIG_BLK_DEV_PS2 extern void ed_setup(char *str, int *ints); extern void tp720_setup(char *str, int *ints); #endif CONFIG_BLK_DEV_PS2 #ifdef CONFIG_MCD extern void mcd_setup(char *str, int *ints); #endif CONFIG_MCD #ifdef CONFIG_MCDX extern void mcdx_setup(char *str, int *ints); #endif CONFIG_MCDX #ifdef CONFIG_SBPCD extern void sbpcd_setup(char *str, int *ints); #endif CONFIG_SBPCD #ifdef CONFIG_AZTCD extern void aztcd_setup(char *str, int *ints); #endif CONFIG_AZTCD #ifdef CONFIG_CDU535 extern void sonycd535_setup(char *str, int *ints); #endif CONFIG_CDU535 #ifdef CONFIG_GSCD extern void gscd_setup(char *str, int *ints); #endif CONFIG_GSCD #ifdef CONFIG_BPCD extern void bpcd_setup(char *str, int *ints); #endif CONFIG_BPCD #ifdef CONFIG_CM206 extern void cm206_setup(char *str, int *ints); #endif CONFIG_CM206 #ifdef CONFIG_OPTCD extern void optcd_setup(char *str, int *ints); #endif CONFIG_OPTCD #ifdef CONFIG_SJCD extern void sjcd_setup(char *str, int *ints); #endif CONFIG_SJCD #ifdef CONFIG_ISP16_CDI extern void isp16_setup(char *str, int *ints); #endif CONFIG_ISP16_CDI #ifdef CONFIG_BLK_DEV_RAM static void ramdisk_start_setup(char *str, int *ints); static void load_ramdisk(char *str, int *ints); static void prompt_ramdisk(char *str, int *ints); static void ramdisk_size(char *str, int *ints); #ifdef CONFIG_BLK_DEV_INITRD static void no_initrd(char *s,int *ints); #endif #endif CONFIG_BLK_DEV_RAM #ifdef CONFIG_ISDN_DRV_ICN extern void icn_setup(char *str, int *ints); #endif #ifdef CONFIG_ISDN_DRV_TELES extern void teles_setup(char *str, int *ints); #endif #ifdef CONFIG_ISDN_DRV_HISAX extern void HiSax_setup(char *str, int *ints); #endif #ifdef CONFIG_ISDN_DRV_PCBIT extern void pcbit_setup(char *str, int *ints); #endif #ifdef CONFIG_ATARIMOUSE extern void atari_mouse_setup (char *str, int *ints); #endif #ifdef CONFIG_DMASOUND extern void dmasound_setup (char *str, int *ints); #endif #ifdef CONFIG_ATARI_SCSI extern void atari_scsi_setup (char *str, int *ints); #endif extern void wd33c93_setup (char *str, int *ints); extern void gvp11_setup (char *str, int *ints); #ifdef CONFIG_DIGI extern void pcxx_setup(char *str, int *ints); #endif #ifdef CONFIG_RISCOM8 extern void riscom8_setup(char *str, int *ints); #endif #ifdef CONFIG_BAYCOM extern void baycom_setup(char *str, int *ints); #endif #ifdef CONFIG_SOUNDMODEM extern void sm_setup(char *str, int *ints); #endif #ifdef CONFIG_WDT extern void wdt_setup(char *str, int *ints); #endif #if defined(CONFIG_SYSVIPC) || defined(CONFIG_KERNELD) extern void ipc_init(void); #endif #ifdef __sparc__ extern int serial_console; #endif /* * Boot command-line arguments */ #define MAX_INIT_ARGS 8 #define MAX_INIT_ENVS 8 extern void time_init(void); static unsigned long memory_start = 0; static unsigned long memory_end = 0; int rows, cols; #ifdef CONFIG_BLK_DEV_RAM extern int rd_doload; /* 1 = load ramdisk, 0 = don't load */ extern int rd_prompt; /* 1 = prompt for ramdisk, 0 = don't prompt */ extern int rd_size; /* Size of the ramdisk(s) */ extern int rd_image_start; /* starting block # of image */ #ifdef CONFIG_BLK_DEV_INITRD kdev_t real_root_dev; #endif #endif int root_mountflags = MS_RDONLY; char *execute_command = NULL; #ifdef CONFIG_ROOT_NFS char nfs_root_name[NFS_ROOT_NAME_LEN] = { "default" }; char nfs_root_addrs[NFS_ROOT_ADDRS_LEN] = { "" }; #endif extern void dquot_init(void); static char * argv_init[MAX_INIT_ARGS+2] = { "init", NULL, }; static char * envp_init[MAX_INIT_ENVS+2] = { "HOME=/", "TERM=linux", NULL, }; char *get_options(char *str, int *ints) { char *cur = str; int i=1; while (cur && isdigit(*cur) && i <= 10) { ints[i++] = simple_strtoul(cur,NULL,0); if ((cur = strchr(cur,',')) != NULL) cur++; } ints[0] = i-1; return(cur); } static void profile_setup(char *str, int *ints) { if (ints[0] > 0) prof_shift = (unsigned long) ints[1]; else #ifdef CONFIG_PROFILE_SHIFT prof_shift = CONFIG_PROFILE_SHIFT; #else prof_shift = 2; #endif } struct { const char *str; void (*setup_func)(char *, int *); } bootsetups[] = { { "reserve=", reserve_setup }, { "profile=", profile_setup }, #ifdef __SMP__ { "nosmp", smp_setup }, { "maxcpus=", smp_setup }, #endif #ifdef CONFIG_BLK_DEV_RAM { "ramdisk_start=", ramdisk_start_setup }, { "load_ramdisk=", load_ramdisk }, { "prompt_ramdisk=", prompt_ramdisk }, { "ramdisk=", ramdisk_size }, { "ramdisk_size=", ramdisk_size }, #ifdef CONFIG_BLK_DEV_INITRD { "noinitrd", no_initrd }, #endif #endif #if defined (CONFIG_AMIGA) || defined (CONFIG_ATARI) { "video=", video_setup }, #endif { "swap=", swap_setup }, { "buff=", buff_setup }, { "panic=", panic_setup }, { "no-scroll", no_scroll }, #ifdef CONFIG_BUGi386 { "no-hlt", no_halt }, { "no387", no_387 }, { "reboot=", reboot_setup }, #endif #ifdef CONFIG_INET { "ether=", eth_setup }, #endif #ifdef CONFIG_PRINTER { "lp=", lp_setup }, #endif #ifdef CONFIG_SCSI { "max_scsi_luns=", scsi_luns_setup }, #endif #ifdef CONFIG_SCSI_ADVANSYS { "advansys=", advansys_setup }, #endif #if defined(CONFIG_BLK_DEV_HD) { "hd=", hd_setup }, #endif #ifdef CONFIG_CHR_DEV_ST { "st=", st_setup }, #endif #ifdef CONFIG_BUSMOUSE { "bmouse=", bmouse_setup }, #endif #ifdef CONFIG_MS_BUSMOUSE { "msmouse=", msmouse_setup }, #endif #ifdef CONFIG_SCSI_SEAGATE { "st0x=", st0x_setup }, { "tmc8xx=", tmc8xx_setup }, #endif #ifdef CONFIG_SCSI_T128 { "t128=", t128_setup }, #endif #ifdef CONFIG_SCSI_PAS16 { "pas16=", pas16_setup }, #endif #ifdef CONFIG_SCSI_GENERIC_NCR5380 { "ncr5380=", generic_NCR5380_setup }, { "ncr53c400=", generic_NCR53C400_setup }, #endif #ifdef CONFIG_SCSI_AHA152X { "aha152x=", aha152x_setup}, #endif #ifdef CONFIG_SCSI_AHA1542 { "aha1542=", aha1542_setup}, #endif #ifdef CONFIG_SCSI_AIC7XXX { "aic7xxx=", aic7xxx_setup}, #endif #ifdef CONFIG_SCSI_BUSLOGIC { "BusLogic=", BusLogic_Setup}, #endif #ifdef CONFIG_SCSI_NCR53C8XX { "ncr53c8xx=", ncr53c8xx_setup}, #endif #ifdef CONFIG_SCSI_EATA { "eata=", eata2x_setup}, #endif #ifdef CONFIG_SCSI_U14_34F { "u14-34f=", u14_34f_setup}, #endif #ifdef CONFIG_SCSI_AM53C974 { "AM53C974=", AM53C974_setup}, #endif #ifdef CONFIG_SCSI_NCR53C406A { "ncr53c406a=", NCR53c406a_setup}, #endif #ifdef CONFIG_SCSI_FUTURE_DOMAIN { "fdomain=", fdomain_setup}, #endif #ifdef CONFIG_SCSI_IN2000 { "in2000=", in2000_setup}, #endif #ifdef CONFIG_SCSI_7000FASST { "wd7000=", wd7000_setup}, #endif #ifdef CONFIG_SCSI_PPA { "ppa=", ppa_setup }, #endif #ifdef CONFIG_SCSI_IBMMCA { "ibmmcascsi=", ibmmca_scsi_setup }, #endif #ifdef CONFIG_BLK_DEV_XD { "xd=", xd_setup }, #endif #ifdef CONFIG_BLK_DEV_EZ { "ez=", ez_setup }, #endif #ifdef CONFIG_BLK_DEV_FD { "floppy=", floppy_setup }, #endif #ifdef CONFIG_BLK_DEV_PS2 { "ed=", ed_setup }, { "tp720=", tp720_setup }, #endif #ifdef CONFIG_CDU31A { "cdu31a=", cdu31a_setup }, #endif CONFIG_CDU31A #ifdef CONFIG_MCD { "mcd=", mcd_setup }, #endif CONFIG_MCD #ifdef CONFIG_MCDX { "mcdx=", mcdx_setup }, #endif CONFIG_MCDX #ifdef CONFIG_SBPCD { "sbpcd=", sbpcd_setup }, #endif CONFIG_SBPCD #ifdef CONFIG_AZTCD { "aztcd=", aztcd_setup }, #endif CONFIG_AZTCD #ifdef CONFIG_CDU535 { "sonycd535=", sonycd535_setup }, #endif CONFIG_CDU535 #ifdef CONFIG_GSCD { "gscd=", gscd_setup }, #endif CONFIG_GSCD #ifdef CONFIG_BPCD { "bpcd=", bpcd_setup }, #endif CONFIG_BPCD #ifdef CONFIG_CM206 { "cm206=", cm206_setup }, #endif CONFIG_CM206 #ifdef CONFIG_OPTCD { "optcd=", optcd_setup }, #endif CONFIG_OPTCD #ifdef CONFIG_SJCD { "sjcd=", sjcd_setup }, #endif CONFIG_SJCD #ifdef CONFIG_ISP16_CDI { "isp16=", isp16_setup }, #endif CONFIG_ISP16_CDI #ifdef CONFIG_SOUND { "sound=", sound_setup }, #endif #ifdef CONFIG_ISDN_DRV_ICN { "icn=", icn_setup }, #endif #ifdef CONFIG_ISDN_DRV_TELES { "teles=", teles_setup }, #endif #ifdef CONFIG_ISDN_DRV_HISAX { "hisax=", HiSax_setup }, { "HiSax=", HiSax_setup }, #endif #ifdef CONFIG_ISDN_DRV_PCBIT { "pcbit=", pcbit_setup }, #endif #ifdef CONFIG_ATARIMOUSE { "atamouse=", atari_mouse_setup }, #endif #ifdef CONFIG_DMASOUND { "dmasound=", dmasound_setup }, #endif #ifdef CONFIG_ATARI_SCSI { "atascsi=", atari_scsi_setup }, #endif #if defined(CONFIG_A3000_SCSI) || defined(CONFIG_A2091_SCSI) \ || defined(CONFIG_GVP11_SCSI) { "wd33c93=", wd33c93_setup }, #endif #if defined(CONFIG_GVP11_SCSI) { "gvp11=", gvp11_setup }, #endif #ifdef CONFIG_DIGI { "digi=", pcxx_setup }, #endif #ifdef CONFIG_RISCOM8 { "riscom8=", riscom8_setup }, #endif #ifdef CONFIG_BAYCOM { "baycom=", baycom_setup }, #endif #ifdef CONFIG_SOUNDMODEM { "soundmodem=", sm_setup }, #endif #ifdef CONFIG_WDT { "wdt=", wdt_setup }, #endif { 0, 0 } }; #ifdef CONFIG_BLK_DEV_RAM static void ramdisk_start_setup(char *str, int *ints) { if (ints[0] > 0 && ints[1] >= 0) rd_image_start = ints[1]; } static void load_ramdisk(char *str, int *ints) { if (ints[0] > 0 && ints[1] >= 0) rd_doload = ints[1] & 1; } static void prompt_ramdisk(char *str, int *ints) { if (ints[0] > 0 && ints[1] >= 0) rd_prompt = ints[1] & 1; } static void ramdisk_size(char *str, int *ints) { if (ints[0] > 0 && ints[1] >= 0) rd_size = ints[1]; } #endif static int checksetup(char *line) { int i = 0; int ints[11]; #ifdef CONFIG_BLK_DEV_IDE /* ide driver needs the basic string, rather than pre-processed values */ if (!strncmp(line,"ide",3) || (!strncmp(line,"hd",2) && line[2] != '=')) { ide_setup(line); return 1; } #endif while (bootsetups[i].str) { int n = strlen(bootsetups[i].str); if (!strncmp(line,bootsetups[i].str,n)) { bootsetups[i].setup_func(get_options(line+n,ints), ints); return 1; } i++; } return 0; } /* this should be approx 2 Bo*oMips to start (note initial shift), and will still work even if initially too large, it will just take slightly longer */ unsigned long loops_per_sec = (1<<12); /* This is the number of bits of precision for the loops_per_second. Each bit takes on average 1.5/HZ seconds. This (like the original) is a little better than 1% */ #define LPS_PREC 8 void calibrate_delay(void) { unsigned long ticks, loopbit; int lps_precision = LPS_PREC; loops_per_sec = (1<<12); printk("Calibrating delay loop.. "); while (loops_per_sec <<= 1) { /* wait for "start of" clock tick */ ticks = jiffies; while (ticks == jiffies) /* nothing */; /* Go .. */ ticks = jiffies; __delay(loops_per_sec); ticks = jiffies - ticks; if (ticks) break; } /* Do a binary approximation to get loops_per_second set to equal one clock (up to lps_precision bits) */ loops_per_sec >>= 1; loopbit = loops_per_sec; while ( lps_precision-- && (loopbit >>= 1) ) { loops_per_sec |= loopbit; ticks = jiffies; while (ticks == jiffies); ticks = jiffies; __delay(loops_per_sec); if (jiffies != ticks) /* longer than 1 tick */ loops_per_sec &= ~loopbit; } /* finally, adjust loops per second in terms of seconds instead of clocks */ loops_per_sec *= HZ; /* Round the value and print it */ printk("ok - %lu.%02lu BogoMIPS\n", (loops_per_sec+2500)/500000, ((loops_per_sec+2500)/5000) % 100); } static void parse_root_dev(char * line) { int base = 0; static struct dev_name_struct { const char *name; const int num; } devices[] = { { "nfs", 0x00ff }, { "hda", 0x0300 }, { "hdb", 0x0340 }, { "hdc", 0x1600 }, { "hdd", 0x1640 }, { "sda", 0x0800 }, { "sdb", 0x0810 }, { "sdc", 0x0820 }, { "sdd", 0x0830 }, { "sde", 0x0840 }, { "ada", 0x1c00 }, { "adb", 0x1c10 }, { "adc", 0x1c20 }, { "add", 0x1c30 }, { "ade", 0x1c40 }, { "fd", 0x0200 }, { "xda", 0x0d00 }, { "xdb", 0x0d40 }, { "ram", 0x0100 }, { "scd", 0x0b00 }, { "mcd", 0x1700 }, { "cdu535", 0x1800 }, { "aztcd", 0x1d00 }, { "cm206cd", 0x2000 }, { "gscd", 0x1000 }, { "sbpcd", 0x1900 }, { "sonycd", 0x1800 }, { "eza", 0x2800 }, { "bpcd", 0x2900 }, #if CONFIG_APBLOCK { "apblock", APBLOCK_MAJOR << 8}, #endif #if CONFIG_DDV { "ddv", DDV_MAJOR << 8}, #endif { NULL, 0 } }; if (strncmp(line,"/dev/",5) == 0) { struct dev_name_struct *dev = devices; line += 5; do { int len = strlen(dev->name); if (strncmp(line,dev->name,len) == 0) { line += len; base = dev->num; break; } dev++; } while (dev->name); } ROOT_DEV = to_kdev_t(base + simple_strtoul(line,NULL,base?10:16)); } /* * This is a simple kernel command line parsing function: it parses * the command line, and fills in the arguments/environment to init * as appropriate. Any cmd-line option is taken to be an environment * variable if it contains the character '='. * * * This routine also checks for options meant for the kernel. * These options are not given to init - they are for internal kernel use only. */ static void parse_options(char *line) { char *next; int args, envs; if (!*line) return; args = 0; envs = 1; /* TERM is set to 'linux' by default */ next = line; while ((line = next) != NULL) { if ((next = strchr(line,' ')) != NULL) *next++ = 0; /* * check for kernel options first.. */ if (!strncmp(line,"root=",5)) { parse_root_dev(line+5); continue; } #ifdef CONFIG_ROOT_NFS if (!strncmp(line, "nfsroot=", 8)) { int n; line += 8; ROOT_DEV = MKDEV(UNNAMED_MAJOR, 255); if (line[0] == '/' || line[0] == ',' || (line[0] >= '0' && line[0] <= '9')) { strncpy(nfs_root_name, line, sizeof(nfs_root_name)); nfs_root_name[sizeof(nfs_root_name)-1] = '\0'; continue; } n = strlen(line) + strlen(NFS_ROOT); if (n >= sizeof(nfs_root_name)) line[sizeof(nfs_root_name) - strlen(NFS_ROOT) - 1] = '\0'; sprintf(nfs_root_name, NFS_ROOT, line); continue; } if (!strncmp(line, "nfsaddrs=", 9)) { line += 9; strncpy(nfs_root_addrs, line, sizeof(nfs_root_addrs)); nfs_root_addrs[sizeof(nfs_root_addrs)-1] = '\0'; continue; } #endif if (!strcmp(line,"ro")) { root_mountflags |= MS_RDONLY; continue; } if (!strcmp(line,"rw")) { root_mountflags &= ~MS_RDONLY; continue; } if (!strcmp(line,"debug")) { console_loglevel = 10; continue; } if (!strncmp(line,"init=",5)) { line += 5; execute_command = line; continue; } if (checksetup(line)) continue; /* * Then check if it's an environment variable or * an option. */ if (strchr(line,'=')) { if (envs >= MAX_INIT_ENVS) break; envp_init[++envs] = line; } else { if (args >= MAX_INIT_ARGS) break; argv_init[++args] = line; } } argv_init[args+1] = NULL; envp_init[envs+1] = NULL; } extern void setup_arch(char **, unsigned long *, unsigned long *); #ifndef __SMP__ /* * Uniprocessor idle thread */ int cpu_idle(void *unused) { for(;;) idle(); } #else /* * Multiprocessor idle thread is in arch/... */ extern int cpu_idle(void * unused); /* * Activate a secondary processor. */ asmlinkage void start_secondary(void) { trap_init(); init_IRQ(); smp_callin(); cpu_idle(NULL); } /* Called by boot processor to activate the rest. */ static void smp_init(void) { int i, j; /* Get other processors into their bootup holding patterns. */ smp_boot_cpus(); /* Create the slave init tasks as sharing pid 0. This should only * happen if we have virtual CPU numbers higher than 0. */ for (i=1; i<smp_num_cpus; i++) { /* We use kernel_thread for the idlers which are * unlocked tasks running in kernel space. */ kernel_thread(cpu_idle, NULL, CLONE_PID); /* Don't assume linear processor numbering */ j = cpu_logical_map[i]; current_set[j]=task[i]; current_set[j]->processor=j; } } /* * The autoprobe routines assume CPU#0 on the i386 * so we don't actually set the game in motion until * they are finished. */ static void smp_begin(void) { smp_threads_ready=1; smp_commence(); } #endif /* * Activate the first processor. */ asmlinkage void start_kernel(void) { char * command_line; /* * This little check will move. */ #ifdef __SMP__ static int first_cpu=1; if(!first_cpu) start_secondary(); first_cpu=0; #endif /* * Interrupts are still disabled. Do necessary setups, then * enable them */ setup_arch(&command_line, &memory_start, &memory_end); memory_start = paging_init(memory_start,memory_end); trap_init(); init_IRQ(); sched_init(); time_init(); parse_options(command_line); #ifdef CONFIG_MODULES init_modules(); #endif #ifdef CONFIG_PROFILE if (!prof_shift) #ifdef CONFIG_PROFILE_SHIFT prof_shift = CONFIG_PROFILE_SHIFT; #else prof_shift = 2; #endif #endif if (prof_shift) { prof_buffer = (unsigned int *) memory_start; /* only text is profiled */ prof_len = (unsigned long) &_etext - (unsigned long) &_stext; prof_len >>= prof_shift; memory_start += prof_len * sizeof(unsigned int); memset(prof_buffer, 0, prof_len * sizeof(unsigned int)); } #ifdef CONFIG_SBUS memory_start = sbus_init(memory_start,memory_end); #endif memory_start = console_init(memory_start,memory_end); #ifdef CONFIG_PCI memory_start = pci_init(memory_start,memory_end); #endif #ifdef CONFIG_MCA memory_start = mca_init(memory_start,memory_end); #endif memory_start = kmalloc_init(memory_start,memory_end); memory_start = kmem_cache_init(memory_start, memory_end); sti(); calibrate_delay(); memory_start = inode_init(memory_start,memory_end); memory_start = file_table_init(memory_start,memory_end); memory_start = name_cache_init(memory_start,memory_end); #ifdef CONFIG_BLK_DEV_INITRD if (initrd_start && !initrd_below_start_ok && initrd_start < memory_start) { printk(KERN_CRIT "initrd overwritten (0x%08lx < 0x%08lx) - " "disabling it.\n",initrd_start,memory_start); initrd_start = 0; } #endif mem_init(memory_start,memory_end); kmem_cache_sizes_init(); vma_init(); buffer_init(); sock_init(); #if defined(CONFIG_SYSVIPC) || defined(CONFIG_KERNELD) ipc_init(); #endif dquot_init(); sti(); check_bugs(); printk(linux_banner); printk("POSIX conformance testing by UNIFIX\n"); #ifdef __SMP__ smp_init(); #endif sysctl_init(); /* * We count on the initial thread going ok * Like idlers init is an unlocked kernel thread, which will * make syscalls (and thus be locked). */ kernel_thread(init, NULL, 0); /* * task[0] is meant to be used as an "idle" task: it may not sleep, but * it might do some general things like count free pages or it could be * used to implement a reasonable LRU algorithm for the paging routines: * anything that can be useful, but shouldn't take time from the real * processes. * * Right now task[0] just does an infinite idle loop. */ cpu_idle(NULL); } #ifdef CONFIG_BLK_DEV_INITRD static int do_linuxrc(void * shell) { static char *argv[] = { "linuxrc", NULL, }; close(0);close(1);close(2); setsid(); (void) open("/dev/tty1",O_RDWR,0); (void) dup(0); (void) dup(0); return execve(shell, argv, envp_init); } static void no_initrd(char *s,int *ints) { mount_initrd = 0; } #endif static int init(void * unused) { #ifdef CONFIG_BLK_DEV_INITRD int real_root_mountflags; #endif /* Launch bdflush from here, instead of the old syscall way. */ kernel_thread(bdflush, NULL, 0); /* Start the background pageout daemon. */ kernel_thread(kswapd, NULL, 0); #if CONFIG_AP1000 /* Start the async paging daemon. */ { extern int asyncd(void *); kernel_thread(asyncd, NULL, 0); } #endif #ifdef CONFIG_BLK_DEV_INITRD real_root_dev = ROOT_DEV; real_root_mountflags = root_mountflags; if (initrd_start && mount_initrd) root_mountflags &= ~MS_RDONLY; else mount_initrd =0; #endif setup(); #ifdef __SMP__ /* * With the devices probed and setup we can * now enter SMP mode. */ smp_begin(); #endif #ifdef CONFIG_UMSDOS_FS { /* When mounting a umsdos fs as root, we detect the pseudo_root (/linux) and initialise it here. pseudo_root is defined in fs/umsdos/inode.c */ extern struct inode *pseudo_root; if (pseudo_root != NULL){ current->fs->root = pseudo_root; current->fs->pwd = pseudo_root; } } #endif #ifdef CONFIG_BLK_DEV_INITRD root_mountflags = real_root_mountflags; if (mount_initrd && ROOT_DEV != real_root_dev && ROOT_DEV == MKDEV(RAMDISK_MAJOR,0)) { int error; int i, pid; pid = kernel_thread(do_linuxrc, "/linuxrc", SIGCHLD); if (pid>0) while (pid != wait(&i)); if (real_root_dev != MKDEV(RAMDISK_MAJOR, 0)) { error = change_root(real_root_dev,"/initrd"); if (error) printk(KERN_ERR "Change root to /initrd: " "error %d\n",error); } } #endif #ifdef __sparc__ if (serial_console == 1) { (void) open("/dev/cua0", O_RDWR, 0); } else if (serial_console == 2) { (void) open("/dev/cua1", O_RDWR, 0); } else { #endif (void) open("/dev/tty1", O_RDWR, 0); #ifdef __sparc__ } #endif (void) dup(0); (void) dup(0); /* * We try each of these until one succeeds. * * The Bourne shell can be used instead of init if we are * trying to recover a really broken machine. */ if(execute_command) execve(execute_command,argv_init,envp_init); execve("/sbin/init",argv_init,envp_init); execve("/etc/init",argv_init,envp_init); execve("/bin/init",argv_init,envp_init); execve("/bin/sh",argv_init,envp_init); panic("No init found. Try passing init= option to kernel."); } |