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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 */ #define __KERNEL_SYSCALLS__ #include <stdarg.h> #include <asm/system.h> #include <asm/io.h> #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/major.h> #include <linux/blk.h> #ifdef CONFIG_ROOT_NFS #include <linux/nfs_fs.h> #endif #ifdef CONFIG_MTRR #include <asm/mtrr.h> #endif #ifdef CONFIG_APM #include <linux/apm_bios.h> #endif #include <asm/bugs.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 const char *linux_banner; static char printbuf[1024]; 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 long kmalloc_init(long,long); extern void sock_init(void); extern unsigned long pci_init(unsigned long, unsigned long); extern void sysctl_init(void); 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); extern void xd_manual_geo_init(char *str, int *ints); 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 in2000_setup(char *str, int *ints); extern void NCR53c406a_setup(char *str, int *ints); extern void sym53c416_setup(char *str, int *ints); extern void wd7000_setup(char *str, int *ints); extern void dc390_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 apm_setup(char *str, int *ints); extern void reboot_setup(char *str, int *ints); #ifdef CONFIG_CDU31A extern void cdu31a_setup(char *str, int *ints); #endif CONFIG_CDU31A #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_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_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_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_SPECIALIX extern void specialix_setup(char *str, int *ints); #endif #ifdef CONFIG_BAYCOM extern void baycom_setup(char *str, int *ints); #endif #ifdef CONFIG_PARIDE_PD extern void pd_setup(char *str, int *ints); #endif #ifdef CONFIG_PARIDE_PF extern void pf_setup(char *str, int *ints); #endif #ifdef CONFIG_PARIDE_PT extern void pt_setup(char *str, int *ints); #endif #ifdef CONFIG_PARIDE_PG extern void pg_setup(char *str, int *ints); #endif #ifdef CONFIG_PARIDE_PCD extern void pcd_setup(char *str, int *ints); #endif #ifdef CONFIG_BLK_CPQ_DA #ifdef CONFIG_BLK_CPQ_DA_EISA extern void cpqarray_setup(char *str, int *ints); #endif #endif #if defined(CONFIG_SYSVIPC) || defined(CONFIG_KERNELD) extern void ipc_init(void); #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 = 0; #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, }; static char * argv_rc[] = { "/bin/sh", NULL }; static char * envp_rc[] = { "HOME=/", "TERM=linux", NULL }; static char * argv[] = { "-/bin/sh",NULL }; static char * envp[] = { "HOME=/usr/root", "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 kernel_param { const char *str; void (*setup_func)(char *, int *); } ; struct kernel_param bootsetups[] = { { "reserve=", reserve_setup }, { "profile=", profile_setup }, #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 { "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_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_SYM53C416 { "sym53c416=", sym53c416_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 #if defined(CONFIG_SCSI_DC390T) && ! defined(CONFIG_SCSI_DC390T_NOGENSUPP) { "tmscsim=", dc390_setup }, #endif #ifdef CONFIG_BLK_DEV_XD { "xd=", xd_setup }, { "xd_geo=", xd_manual_geo_init }, #endif #ifdef CONFIG_BLK_DEV_FD { "floppy=", floppy_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_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_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_CYCLADES { "cyclades=", cy_setup }, #endif #ifdef CONFIG_DIGI { "digi=", pcxx_setup }, #endif #ifdef CONFIG_RISCOM8 { "riscom8=", riscom8_setup }, #endif #ifdef CONFIG_SPECIALIX { "specialix=", specialix_setup }, #endif #ifdef CONFIG_BAYCOM { "baycom=", baycom_setup }, #endif #ifdef CONFIG_BLK_CPQ_DA #ifdef CONFIG_BLK_CPQ_DA_EISA { "smart2=", cpqarray_setup }, #endif #endif { 0, 0 } }; static struct kernel_param raw_params[] = { #ifdef CONFIG_PARIDE_PD { "pd.", pd_setup }, #endif #ifdef CONFIG_PARIDE_PCD { "pcd.", pcd_setup }, #endif #ifdef CONFIG_PARIDE_PF { "pf.", pf_setup }, #endif #ifdef CONFIG_PARIDE_PT { "pt.", pt_setup }, #endif #ifdef CONFIG_PARIDE_PG { "pg.", pg_setup }, #endif #ifdef CONFIG_APM { "apm=", apm_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] & 3; } 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++; } for (i=0; raw_params[i].str; i++) { int n = strlen(raw_params[i].str); if (!strncmp(line,raw_params[i].str,n)) { raw_params[i].setup_func(line+n, NULL); return 1; } } 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); #if defined(__SMP__) && defined(__i386__) unsigned long smp_loops_per_tick = 1000000; #endif /* 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) { int ticks; int 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); #if defined(__SMP__) && defined(__i386__) smp_loops_per_tick = loops_per_sec / 400; #endif } static void parse_root_dev(char * line) { int base = 0; static struct dev_name_struct { const char *name; const int num; } devices[] = { { "nfs", 0x00ff }, { "loop", 0x0700 }, { "hda", 0x0300 }, { "hdb", 0x0340 }, { "hdc", 0x1600 }, { "hdd", 0x1640 }, { "hde", 0x2100 }, { "hdf", 0x2140 }, { "hdg", 0x2200 }, { "hdh", 0x2240 }, { "sda", 0x0800 }, { "sdb", 0x0810 }, { "sdc", 0x0820 }, { "sdd", 0x0830 }, { "sde", 0x0840 }, { "sdf", 0x0850 }, { "sdg", 0x0860 }, { "sdh", 0x0870 }, { "sdi", 0x0880 }, { "sdj", 0x0890 }, { "sdk", 0x08a0 }, { "sdl", 0x08b0 }, { "sdm", 0x08c0 }, { "sdn", 0x08d0 }, { "sdo", 0x08e0 }, { "sdp", 0x08f0 }, #ifdef CONFIG_BLK_DEV_DAC960 { "rd/c0d0p",0x3000 }, { "rd/c0d1p",0x3008 }, { "rd/c0d2p",0x3010 }, { "rd/c0d3p",0x3018 }, { "rd/c0d4p",0x3020 }, { "rd/c0d5p",0x3028 }, { "rd/c0d6p",0x3030 }, { "rd/c0d7p",0x3038 }, { "rd/c0d8p",0x3040 }, { "rd/c0d9p",0x3048 }, { "rd/c0d10p",0x3050 }, { "rd/c0d11p",0x3058 }, { "rd/c0d12p",0x3060 }, { "rd/c0d13p",0x3068 }, { "rd/c0d14p",0x3070 }, { "rd/c0d15p",0x3078 }, #endif { "fd", 0x0200 }, { "xda", 0x0d00 }, { "xdb", 0x0d40 }, { "ram", 0x0100 }, { "scd", 0x0b00 }, { "mcd", 0x1700 }, { "cdu535", 0x1800 }, { "aztcd", 0x1d00 }, { "cm206cd", 0x2000 }, { "gscd", 0x1000 }, { "sbpcd", 0x1900 }, { "sonycd", 0x1800 }, #ifdef CONFIG_PARIDE_PD { "pda", 0x2d00 }, { "pdb", 0x2d10 }, { "pdc", 0x2d20 }, { "pdd", 0x2d30 }, #endif #ifdef CONFIG_PARIDE_PCD { "pcd", 0x2e00 }, #endif #ifdef CONFIG_PARIDE_PF { "pf", 0x2f00 }, #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 *); extern void arch_syms_export(void); #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 CPU#0 to activate the rest. */ static void smp_init(void) { int i, j; 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++) { struct task_struct *n, *p; j = cpu_logical_map[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 */ current_set[j]=task[i]; current_set[j]->processor=j; cli(); n = task[i]->next_run; p = task[i]->prev_run; nr_running--; n->prev_run = p; p->next_run = n; task[i]->next_run = task[i]->prev_run = task[i]; sti(); } } /* * 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)); } memory_start = console_init(memory_start,memory_end); #ifdef CONFIG_PCI memory_start = pci_init(memory_start,memory_end); #endif memory_start = kmalloc_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_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); buffer_init(); sock_init(); #if defined(CONFIG_SYSVIPC) || defined(CONFIG_KERNELD) ipc_init(); #endif dquot_init(); arch_syms_export(); sti(); check_bugs(); #if defined(CONFIG_MTRR) && defined(__SMP__) init_mtrr_config(); #endif printk(linux_banner); #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 a infinite idle loop. */ cpu_idle(NULL); } static int printf(const char *fmt, ...) { va_list args; int i; va_start(args, fmt); write(1,printbuf,i=vsprintf(printbuf, fmt, args)); va_end(args); return i; } static int do_rc(void * rc) { close(0); if (open(rc,O_RDONLY,0)) return -1; return execve("/bin/sh", argv_rc, envp_rc); } static int do_shell(void * shell) { 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); } #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) { int pid,i; #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); #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; 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 /* * This keeps serial console MUCH cleaner, but does assume * the console driver checks there really is a video device * attached (Sparc effectively does). */ if ((open("/dev/tty1",O_RDWR,0) < 0) && (open("/dev/ttyS0",O_RDWR,0) < 0)) printk("Unable to open an initial console.\n"); (void) dup(0); (void) dup(0); if (!execute_command) { execve("/etc/init",argv_init,envp_init); execve("/bin/init",argv_init,envp_init); execve("/sbin/init",argv_init,envp_init); /* if this fails, fall through to original stuff */ pid = kernel_thread(do_rc, "/etc/rc", SIGCHLD); if (pid>0) while (pid != wait(&i)) /* nothing */; } while (1) { pid = kernel_thread(do_shell, execute_command ? execute_command : "/bin/sh", SIGCHLD); if (pid < 0) { printf("Fork failed in init\n\r"); continue; } while (1) if (pid == wait(&i)) break; printf("\n\rchild %d died with code %04x\n\r",pid,i); sync(); } return -1; } |