diff options
Diffstat (limited to 'init/main.c')
| -rw-r--r-- | init/main.c | 578 |
1 files changed, 578 insertions, 0 deletions
diff --git a/init/main.c b/init/main.c new file mode 100644 index 000000000..92cc55d5f --- /dev/null +++ b/init/main.c @@ -0,0 +1,578 @@ +/* + * linux/init/main.c + * + * Copyright (C) 1991, 1992 Linus Torvalds + */ + +#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/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 <asm/bugs.h> + +#ifdef CONFIG_MIPS_JAZZ +#include <asm/jazz.h> +#if 1 +#include <linux/netdevice.h> +#include <linux/etherdevice.h> +#endif +#endif + +extern unsigned long * prof_buffer; +extern unsigned long prof_len; +extern char _stext, _etext; +extern char *linux_banner; + +static char printbuf[1024]; + +extern int console_loglevel; + +extern void init(void); +extern void init_IRQ(void); +extern void init_modules(void); +extern long console_init(long, long); +extern long kmalloc_init(long,long); +extern long blk_dev_init(long,long); +extern long chr_dev_init(long,long); +extern void sock_init(void); +extern long rd_init(long mem_start, int length); +unsigned long net_dev_init(unsigned long, unsigned long); +extern long pci_init(long, long); + +extern void bmouse_setup(char *str, int *ints); +extern void eth_setup(char *str, int *ints); +extern void xd_setup(char *str, int *ints); +extern void floppy_setup(char *str, int *ints); +extern void mcd_setup(char *str, int *ints); +extern void aztcd_setup(char *str, int *ints); +extern void st_setup(char *str, int *ints); +extern void st0x_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 aha152x_setup(char *str, int *ints); +extern void aha1542_setup(char *str, int *ints); +extern void aha274x_setup(char *str, int *ints); +extern void buslogic_setup(char *str, int *ints); +extern void scsi_luns_setup(char *str, int *ints); +extern void sound_setup(char *str, int *ints); +#ifdef CONFIG_SBPCD +extern void sbpcd_setup(char *str, int *ints); +#endif CONFIG_SBPCD +#ifdef CONFIG_CDU31A +extern void cdu31a_setup(char *str, int *ints); +#endif CONFIG_CDU31A +#ifdef CONFIG_CDU535 +extern void sonycd535_setup(char *str, int *ints); +#endif CONFIG_CDU535 +void ramdisk_setup(char *str, int *ints); + +#ifdef CONFIG_SYSVIPC +extern void ipc_init(void); +#endif +#ifdef CONFIG_SCSI +extern unsigned long scsi_dev_init(unsigned long, unsigned long); +#endif +#ifdef CONFIG_MIPS_JAZZ +#include <asm/jazzdma.h> +#endif +#ifdef CONFIG_REMOTE_DEBUG +#include <asm/gdb-stub.h> +#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; + +static char term[21]; +int rows, cols; + +int ramdisk_size; +int root_mountflags = 0; + +static char * argv_init[MAX_INIT_ARGS+2] = { "init", NULL, }; +static char * envp_init[MAX_INIT_ENVS+2] = { "HOME=/", term, NULL, }; + +static char * argv_rc[] = { "/bin/sh", NULL }; +static char * envp_rc[] = { "HOME=/", term, NULL }; + +static char * argv[] = { "-/bin/sh",NULL }; +static char * envp[] = { "HOME=/usr/root", term, 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); +} + +struct { + char *str; + void (*setup_func)(char *, int *); +} bootsetups[] = { + { "reserve=", reserve_setup }, + { "ramdisk=", ramdisk_setup }, +#ifdef CONFIG_BUGi386 + { "no-hlt", no_halt }, + { "no387", no_387 }, +#endif +#ifdef CONFIG_INET + { "ether=", eth_setup }, +#endif +#ifdef CONFIG_SCSI + { "max_scsi_luns=", scsi_luns_setup }, +#endif +#ifdef CONFIG_BLK_DEV_IDE + { "hda=", hda_setup }, + { "hdb=", hdb_setup }, + { "hdc=", hdc_setup }, + { "hdd=", hdd_setup }, + { "hd=", ide_setup }, +#elif 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_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 }, +#endif +#ifdef CONFIG_SCSI_AHA152X + { "aha152x=", aha152x_setup}, +#endif +#ifdef CONFIG_SCSI_AHA1542 + { "aha1542=", aha1542_setup}, +#endif +#ifdef CONFIG_SCSI_AHA274X + { "aha274x=", aha274x_setup}, +#endif +#ifdef CONFIG_SCSI_BUSLOGIC + { "buslogic=", buslogic_setup}, +#endif +#ifdef CONFIG_BLK_DEV_XD + { "xd=", xd_setup }, +#endif +#ifdef CONFIG_BLK_DEV_FD + { "floppy=", floppy_setup }, +#endif +#ifdef CONFIG_MCD + { "mcd=", mcd_setup }, +#endif +#ifdef CONFIG_AZTCD + { "aztcd=", aztcd_setup }, +#endif +#ifdef CONFIG_CDU535 + { "sonycd535=", sonycd535_setup }, +#endif CONFIG_CDU535 +#ifdef CONFIG_SOUND + { "sound=", sound_setup }, +#endif +#ifdef CONFIG_SBPCD + { "sbpcd=", sbpcd_setup }, +#endif CONFIG_SBPCD +#ifdef CONFIG_CDU31A + { "cdu31a=", cdu31a_setup }, +#endif CONFIG_CDU31A + { 0, 0 } +}; + +void ramdisk_setup(char *str, int *ints) +{ + if (ints[0] > 0 && ints[1] >= 0) + ramdisk_size = ints[1]; +} + +static int checksetup(char *line) +{ + int i = 0; + int ints[11]; + + 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; +} + +unsigned long loops_per_sec = 1; + +static void calibrate_delay(void) +{ + int ticks; + + 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 >= HZ) { + loops_per_sec = muldiv(loops_per_sec, HZ, ticks); + printk("ok - %lu.%02lu BogoMips\n", + loops_per_sec/500000, + (loops_per_sec/5000) % 100); + return; + } + } + printk("failed\n"); +} + + +/* + * 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; + char *devnames[] = { "hda", "hdb", "hdc", "hdd", "sda", "sdb", "sdc", "sdd", "sde", "fd", "xda", "xdb", NULL }; + int devnums[] = { 0x300, 0x340, 0x1600, 0x1640, 0x800, 0x810, 0x820, 0x830, 0x840, 0x200, 0xD00, 0xD40, 0}; + int args, envs; + + if (!*line) + return; + args = 0; + envs = 1; /* TERM is set to 'console' 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)) { + int n; + line += 5; + if (strncmp(line,"/dev/",5)) { + ROOT_DEV = simple_strtoul(line,NULL,16); + continue; + } + line += 5; + for (n = 0 ; devnames[n] ; n++) { + int len = strlen(devnames[n]); + if (!strncmp(line,devnames[n],len)) { + ROOT_DEV = devnums[n]+simple_strtoul(line+len,NULL,0); + break; + } + } + continue; + } + 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 (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 check_bugs(void); +extern void setup_arch(char **, unsigned long *, unsigned long *); + +asmlinkage void start_kernel(void) +{ + char * command_line; +/* + * 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(); + parse_options(command_line); + init_modules(); +#ifdef CONFIG_PROFILE + prof_buffer = (unsigned long *) memory_start; + /* only text is profiled */ + prof_len = (unsigned long) &_etext - (unsigned long) &_stext; + prof_len >>= CONFIG_PROFILE_SHIFT; + memory_start += prof_len * sizeof(unsigned long); +#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 + memory_start = kmalloc_init(memory_start,memory_end); +#ifdef CONFIG_MIPS_JAZZ + memory_start = vdma_init(memory_start,memory_end); +#endif + sti(); + calibrate_delay(); + memory_start = chr_dev_init(memory_start,memory_end); + memory_start = blk_dev_init(memory_start,memory_end); + sti(); +#ifdef CONFIG_SCSI + memory_start = scsi_dev_init(memory_start,memory_end); +#endif +#ifdef CONFIG_INET + memory_start = net_dev_init(memory_start,memory_end); +#endif + 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); + mem_init(memory_start,memory_end); + buffer_init(); +#ifndef CONFIG_MIPS_JAZZ + /* + * time_init() works well for the Deskstation but fails + * on Acer Pica which uses a completly different design. + * Unfortunately no info yet about the clock... + */ + time_init(); +#endif + sock_init(); +#ifdef CONFIG_SYSVIPC + ipc_init(); +#endif + sti(); + check_bugs(); + + printk(linux_banner); + +#if 0 /* HACKS FOR THE SONIC DRIVER TEST */ + { + int rc; + struct device *dev; + + printk("opening ETH0\n"); + dev = dev_get("eth0"); + printk("get_dev returned %p\n",dev); + if (dev) + { + rc = dev_open(dev); + printk("dev_open() returned %d\n",rc); + } + } +#endif + + if (!fork()) /* we count on this going ok */ + init(); + + +/* + * 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. + */ + for(;;) + idle(); +} + +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; +} + +void init(void) +{ + int pid,i; + + setup(); + sprintf(term, "TERM=con%dx%d", ORIG_VIDEO_COLS, ORIG_VIDEO_LINES); + + #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 + + (void) open("/dev/tty1",O_RDWR,0); + (void) dup(0); + (void) dup(0); + +#if 0 /* HACKS FOR THE PARALLEL DRIVER TEST */ + { + int fd; + int rc; + + fd = open("/dev/lp0",O_WRONLY,0); + printk("open(/dev/lp0,O_WRONLY) returns %d\n",fd); + + for (;;) + rc = write(fd,"Hello World!\n\r",14); + } +#endif + +#if 0 /* HACKS FOR THE SERIAL DRIVER TEST */ + { + int fd; + int rc; + char c; + + fd = open("/dev/ttyS0",O_RDWR | O_NDELAY,0); + printk("open(/dev/ttyS0,O_RDWR) returns %d\n",fd); + + for (;;) { + rc = write(fd,"Hello World!\n\r",14); + while (sys_read(fd,&c,1) == 1) + printk("%c",c); + } + } +#endif +#if 0 /* HACKS FOR THE FLOPPY DRIVER TEST */ + { + int fd; + int rc; + char c; + + show_floppy(); + printk("Trying to open /dev/fd0...\n"); + fd = open("/dev/fd0",O_RDWR,0); + printk("open(/dev/fd0,O_RDWR) returns %d\n",fd); + + if (fd > 0) { + for (;;) { + while ((rc = sys_read(fd,&c,1)) == 1) + printk("%c",c); + printk("read failed with rc=%d\n",rc); + } + } else + for (;;); + } +#endif + + 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 */ + + if (!(pid=fork())) { + close(0); + if (open("/etc/rc",O_RDONLY,0)) + _exit(1); + execve("/bin/sh",argv_rc,envp_rc); + _exit(2); + } + if (pid>0) + while (pid != wait(&i)) + /* nothing */; + while (1) { + if ((pid = fork()) < 0) { + printf("Fork failed in init\n\r"); + continue; + } + if (!pid) { + close(0);close(1);close(2); + setsid(); + (void) open("/dev/tty1",O_RDWR,0); + (void) dup(0); + (void) dup(0); + _exit(execve("/bin/sh",argv,envp)); + } + while (1) + if (pid == wait(&i)) + break; + printf("\n\rchild %d died with code %04x\n\r",pid,i); + sync(); + } + _exit(0); +} |