/* * 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 */ #define __KERNEL_SYSCALLS__ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef CONFIG_ROOT_NFS #include #endif #include #include #include #include #ifdef CONFIG_SGI #include #endif /* * 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 kswapd_setup(void); extern void init_IRQ(void); extern void init_modules(void); extern long console_init(long, long); extern void sock_init(void); extern void uidcache_init(void); extern unsigned long pci_init(unsigned long, unsigned long); extern long mca_init(long, long); extern long sbus_init(long, long); extern long powermac_init(unsigned long, unsigned long); extern void sysctl_init(void); extern void filescache_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); #ifdef CONFIG_PRINTER extern void lp_setup(char *str, int *ints); #endif extern void eth_setup(char *str, int *ints); #ifdef CONFIG_ARCNET_COM20020 extern void com20020_setup(char *str, int *ints); #endif #ifdef CONFIG_ARCNET_RIM_I extern void arcrimi_setup(char *str, int *ints); #endif #ifdef CONFIG_ARCNET_COM90xxIO extern void com90io_setup(char *str, int *ints); #endif #ifdef CONFIG_ARCNET_COM90xx extern void com90xx_setup(char *str, int *ints); #endif #ifdef CONFIG_DECNET extern void decnet_setup(char *str, int *ints); #endif 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 gdth_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); #ifdef NOTDEF extern void ppa_setup(char *str, int *ints); #endif 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_HISAX extern void HiSax_setup(char *str, int *ints); #endif #ifdef CONFIG_DIGIEPCA extern void epca_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); extern void ncr53c7xx_setup (char *str, int *ints); #ifdef CONFIG_CYCLADES extern void cy_setup(char *str, int *ints); #endif #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_PMAC_CONSOLE extern void pmac_cons_setup(char *str, int *ints); extern void pmac_vmode_setup(char *str, int *ints); #endif #ifdef CONFIG_WDT extern void wdt_setup(char *str, int *ints); #endif #ifdef CONFIG_PARPORT extern void parport_setup(char *str, int *ints); #endif #ifdef CONFIG_PLIP extern void plip_setup(char *str, int *ints); #endif #ifdef CONFIG_HFMODEM extern void hfmodem_setup(char *str, int *ints); #endif #ifdef CONFIG_FTAPE extern void ftape_setup(char *str, int *ints); #endif #if defined(CONFIG_SYSVIPC) || defined(CONFIG_KERNELD) extern void ipc_init(void); #endif #ifdef CONFIG_MIPS_JAZZ #include #endif #ifdef CONFIG_REMOTE_DEBUG #include #endif extern int serial_console; #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); } __initfunc(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[] __initdata = { { "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 }, #ifdef CONFIG_VT { "no-scroll", no_scroll }, #endif #ifdef CONFIG_BUGi386 { "no-hlt", no_halt }, { "no387", no_387 }, { "reboot=", reboot_setup }, #endif #ifdef CONFIG_INET { "ether=", eth_setup }, #endif #ifdef CONFIG_ARCNET_COM20020 { "com20020=", com20020_setup }, #endif #ifdef CONFIG_ARCNET_RIM_I { "arcrimi=", arcrimi_setup }, #endif #ifdef CONFIG_ARCNET_COM90xxIO { "com90io=", com90io_setup }, #endif #ifdef CONFIG_ARCNET_COM90xx { "com90xx=", com90xx_setup }, #endif #ifdef CONFIG_DECNET { "decnet=", decnet_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_GDTH { "gdth=", gdth_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 NOTDEF /* 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_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_A4000T_SCSI) || defined(CONFIG_WARPENGINE_SCSI) || defined(CONFIG_A4091_SCSI) { "53c7xx=", ncr53c7xx_setup }, #endif #if defined(CONFIG_A3000_SCSI) || defined(CONFIG_A2091_SCSI) \ || defined(CONFIG_GVP11_SCSI) || defined(CONFIG_SCSI_SGIWD93) { "wd33c93=", wd33c93_setup }, #endif #if defined(CONFIG_GVP11_SCSI) { "gvp11=", gvp11_setup }, #endif #ifdef CONFIG_CYCLADES { "cyclades=", cy_setup }, #endif #ifdef CONFIG_DIGI { "digi=", pcxx_setup }, #endif #ifdef CONFIG_DIGIEPCA { "digiepca=", epca_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 #ifdef CONFIG_PARPORT { "parport=", parport_setup }, #endif #ifdef CONFIG_PLIP { "plip=", plip_setup }, #endif #ifdef CONFIG_SOUNDMODEM { "hfmodem=", hfmodem_setup }, #endif #ifdef CONFIG_PMAC_CONSOLE { "console=", pmac_cons_setup }, { "vmode=", pmac_vmode_setup }, #endif #ifdef CONFIG_FTAPE { "ftape=", ftape_setup}, #endif { 0, 0 } }; #ifdef CONFIG_BLK_DEV_RAM __initfunc(static void ramdisk_start_setup(char *str, int *ints)) { if (ints[0] > 0 && ints[1] >= 0) rd_image_start = ints[1]; } __initfunc(static void load_ramdisk(char *str, int *ints)) { if (ints[0] > 0 && ints[1] >= 0) rd_doload = ints[1] & 1; } __initfunc(static void prompt_ramdisk(char *str, int *ints)) { if (ints[0] > 0 && ints[1] >= 0) rd_prompt = ints[1] & 1; } __initfunc(static void ramdisk_size(char *str, int *ints)) { if (ints[0] > 0 && ints[1] >= 0) rd_size = ints[1]; } #endif __initfunc(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 __initfunc(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); } __initfunc(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 }, { "eda", 0x2400 }, { "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. */ __initfunc(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; /* In case LILO is going to boot us with default command line, * it prepends "auto" before the whole cmdline which makes * the shell think it should execute a script with such name. * So we ignore all arguments entered _before_ init=... [MJ] */ args = 0; 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); /* Called by boot processor to activate the rest. */ __initfunc(static void smp_init(void)) { /* Get other processors into their bootup holding patterns. */ smp_boot_cpus(); } /* * The autoprobe routines assume CPU#0 on the i386 * so we don't actually set the game in motion until * they are finished. */ __initfunc(static void smp_begin(void)) { smp_threads_ready=1; smp_commence(); } #endif extern void initialize_secondary(void); /* * Activate the first processor. */ __initfunc(asmlinkage void start_kernel(void)) { char * command_line; #ifdef __SMP__ static int boot_cpu = 1; /* "current" has been set up, we need to load it now */ if (!boot_cpu) initialize_secondary(); boot_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 #ifdef CONFIG_PMAC memory_start = powermac_init(memory_start, memory_end); #endif memory_start = console_init(memory_start,memory_end); #ifdef CONFIG_REMOTE_DEBUG set_debug_traps(); /* breakpoint(); */ /* execute a BREAK insn */ #endif #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 = kmem_cache_init(memory_start, memory_end); sti(); calibrate_delay(); #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 #ifdef CONFIG_BINFMT_IRIX init_inventory (); #endif mem_init(memory_start,memory_end); kmem_cache_sizes_init(); #ifdef CONFIG_PROC_FS proc_root_init(); #endif uidcache_init(); filescache_init(); dcache_init(); vma_init(); buffer_init(); inode_init(); file_table_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 #ifdef CONFIG_SYSCTL sysctl_init(); #endif /* * 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); } __initfunc(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. */ kswapd_setup(); 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(0); #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 setup(1); if (open("/dev/console",O_RDWR,0) < 0) printk("Unable to open an initial console.\n"); (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."); }