749 строки
17 KiB
C
749 строки
17 KiB
C
/*
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* linux/init/main.c
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*
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* Copyright (C) 1991, 1992 Linus Torvalds
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*
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* GK 2/5/95 - Changed to support mounting root fs via NFS
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* Added initrd & change_root: Werner Almesberger & Hans Lermen, Feb '96
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* Moan early if gcc is old, avoiding bogus kernels - Paul Gortmaker, May '96
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* Simplified starting of init: Michael A. Griffith <grif@acm.org>
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*/
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#define __KERNEL_SYSCALLS__
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#include <linux/config.h>
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#include <linux/types.h>
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#include <linux/module.h>
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#include <linux/proc_fs.h>
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#include <linux/devfs_fs_kernel.h>
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#include <linux/kernel.h>
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#include <linux/syscalls.h>
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#include <linux/string.h>
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#include <linux/ctype.h>
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#include <linux/delay.h>
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#include <linux/utsname.h>
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#include <linux/ioport.h>
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#include <linux/init.h>
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#include <linux/smp_lock.h>
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#include <linux/initrd.h>
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#include <linux/hdreg.h>
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#include <linux/bootmem.h>
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#include <linux/tty.h>
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#include <linux/gfp.h>
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#include <linux/percpu.h>
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#include <linux/kmod.h>
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#include <linux/kernel_stat.h>
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#include <linux/security.h>
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#include <linux/workqueue.h>
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#include <linux/profile.h>
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#include <linux/rcupdate.h>
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#include <linux/moduleparam.h>
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#include <linux/kallsyms.h>
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#include <linux/writeback.h>
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#include <linux/cpu.h>
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#include <linux/cpuset.h>
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#include <linux/efi.h>
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#include <linux/unistd.h>
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#include <linux/rmap.h>
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#include <linux/mempolicy.h>
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#include <linux/key.h>
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#include <asm/io.h>
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#include <asm/bugs.h>
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#include <asm/setup.h>
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#include <asm/sections.h>
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#include <asm/cacheflush.h>
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/*
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* This is one of the first .c files built. Error out early
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* if we have compiler trouble..
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*/
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#if __GNUC__ == 2 && __GNUC_MINOR__ == 96
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#ifdef CONFIG_FRAME_POINTER
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#error This compiler cannot compile correctly with frame pointers enabled
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#endif
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#endif
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#ifdef CONFIG_X86_LOCAL_APIC
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#include <asm/smp.h>
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#endif
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/*
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* Versions of gcc older than that listed below may actually compile
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* and link okay, but the end product can have subtle run time bugs.
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* To avoid associated bogus bug reports, we flatly refuse to compile
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* with a gcc that is known to be too old from the very beginning.
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*/
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#if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 95)
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#error Sorry, your GCC is too old. It builds incorrect kernels.
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#endif
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static int init(void *);
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extern void init_IRQ(void);
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extern void fork_init(unsigned long);
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extern void mca_init(void);
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extern void sbus_init(void);
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extern void sysctl_init(void);
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extern void signals_init(void);
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extern void buffer_init(void);
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extern void pidhash_init(void);
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extern void pidmap_init(void);
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extern void prio_tree_init(void);
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extern void radix_tree_init(void);
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extern void free_initmem(void);
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extern void populate_rootfs(void);
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extern void driver_init(void);
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extern void prepare_namespace(void);
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#ifdef CONFIG_ACPI
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extern void acpi_early_init(void);
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#else
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static inline void acpi_early_init(void) { }
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#endif
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#ifndef CONFIG_DEBUG_RODATA
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static inline void mark_rodata_ro(void) { }
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#endif
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#ifdef CONFIG_TC
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extern void tc_init(void);
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#endif
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enum system_states system_state;
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EXPORT_SYMBOL(system_state);
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/*
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* Boot command-line arguments
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*/
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#define MAX_INIT_ARGS CONFIG_INIT_ENV_ARG_LIMIT
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#define MAX_INIT_ENVS CONFIG_INIT_ENV_ARG_LIMIT
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extern void time_init(void);
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/* Default late time init is NULL. archs can override this later. */
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void (*late_time_init)(void);
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extern void softirq_init(void);
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/* Untouched command line (eg. for /proc) saved by arch-specific code. */
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char saved_command_line[COMMAND_LINE_SIZE];
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static char *execute_command;
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static char *ramdisk_execute_command;
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/* Setup configured maximum number of CPUs to activate */
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static unsigned int max_cpus = NR_CPUS;
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/*
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* Setup routine for controlling SMP activation
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*
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* Command-line option of "nosmp" or "maxcpus=0" will disable SMP
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* activation entirely (the MPS table probe still happens, though).
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*
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* Command-line option of "maxcpus=<NUM>", where <NUM> is an integer
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* greater than 0, limits the maximum number of CPUs activated in
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* SMP mode to <NUM>.
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*/
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static int __init nosmp(char *str)
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{
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max_cpus = 0;
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return 1;
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}
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__setup("nosmp", nosmp);
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static int __init maxcpus(char *str)
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{
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get_option(&str, &max_cpus);
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return 1;
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}
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__setup("maxcpus=", maxcpus);
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static char * argv_init[MAX_INIT_ARGS+2] = { "init", NULL, };
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char * envp_init[MAX_INIT_ENVS+2] = { "HOME=/", "TERM=linux", NULL, };
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static const char *panic_later, *panic_param;
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extern struct obs_kernel_param __setup_start[], __setup_end[];
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static int __init obsolete_checksetup(char *line)
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{
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struct obs_kernel_param *p;
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p = __setup_start;
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do {
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int n = strlen(p->str);
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if (!strncmp(line, p->str, n)) {
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if (p->early) {
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/* Already done in parse_early_param? (Needs
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* exact match on param part) */
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if (line[n] == '\0' || line[n] == '=')
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return 1;
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} else if (!p->setup_func) {
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printk(KERN_WARNING "Parameter %s is obsolete,"
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" ignored\n", p->str);
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return 1;
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} else if (p->setup_func(line + n))
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return 1;
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}
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p++;
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} while (p < __setup_end);
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return 0;
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}
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/*
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* This should be approx 2 Bo*oMips to start (note initial shift), and will
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* still work even if initially too large, it will just take slightly longer
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*/
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unsigned long loops_per_jiffy = (1<<12);
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EXPORT_SYMBOL(loops_per_jiffy);
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static int __init debug_kernel(char *str)
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{
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if (*str)
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return 0;
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console_loglevel = 10;
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return 1;
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}
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static int __init quiet_kernel(char *str)
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{
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if (*str)
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return 0;
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console_loglevel = 4;
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return 1;
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}
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__setup("debug", debug_kernel);
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__setup("quiet", quiet_kernel);
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static int __init loglevel(char *str)
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{
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get_option(&str, &console_loglevel);
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return 1;
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}
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__setup("loglevel=", loglevel);
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/*
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* Unknown boot options get handed to init, unless they look like
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* failed parameters
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*/
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static int __init unknown_bootoption(char *param, char *val)
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{
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/* Change NUL term back to "=", to make "param" the whole string. */
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if (val) {
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/* param=val or param="val"? */
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if (val == param+strlen(param)+1)
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val[-1] = '=';
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else if (val == param+strlen(param)+2) {
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val[-2] = '=';
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memmove(val-1, val, strlen(val)+1);
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val--;
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} else
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BUG();
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}
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/* Handle obsolete-style parameters */
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if (obsolete_checksetup(param))
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return 0;
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/*
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* Preemptive maintenance for "why didn't my mispelled command
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* line work?"
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*/
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if (strchr(param, '.') && (!val || strchr(param, '.') < val)) {
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printk(KERN_ERR "Unknown boot option `%s': ignoring\n", param);
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return 0;
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}
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if (panic_later)
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return 0;
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if (val) {
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/* Environment option */
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unsigned int i;
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for (i = 0; envp_init[i]; i++) {
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if (i == MAX_INIT_ENVS) {
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panic_later = "Too many boot env vars at `%s'";
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panic_param = param;
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}
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if (!strncmp(param, envp_init[i], val - param))
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break;
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}
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envp_init[i] = param;
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} else {
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/* Command line option */
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unsigned int i;
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for (i = 0; argv_init[i]; i++) {
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if (i == MAX_INIT_ARGS) {
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panic_later = "Too many boot init vars at `%s'";
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panic_param = param;
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}
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}
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argv_init[i] = param;
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}
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return 0;
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}
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static int __init init_setup(char *str)
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{
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unsigned int i;
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execute_command = str;
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/*
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* In case LILO is going to boot us with default command line,
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* it prepends "auto" before the whole cmdline which makes
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* the shell think it should execute a script with such name.
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* So we ignore all arguments entered _before_ init=... [MJ]
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*/
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for (i = 1; i < MAX_INIT_ARGS; i++)
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argv_init[i] = NULL;
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return 1;
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}
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__setup("init=", init_setup);
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static int __init rdinit_setup(char *str)
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{
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unsigned int i;
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ramdisk_execute_command = str;
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/* See "auto" comment in init_setup */
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for (i = 1; i < MAX_INIT_ARGS; i++)
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argv_init[i] = NULL;
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return 1;
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}
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__setup("rdinit=", rdinit_setup);
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extern void setup_arch(char **);
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#ifndef CONFIG_SMP
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#ifdef CONFIG_X86_LOCAL_APIC
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static void __init smp_init(void)
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{
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APIC_init_uniprocessor();
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}
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#else
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#define smp_init() do { } while (0)
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#endif
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static inline void setup_per_cpu_areas(void) { }
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static inline void smp_prepare_cpus(unsigned int maxcpus) { }
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#else
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#ifdef __GENERIC_PER_CPU
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unsigned long __per_cpu_offset[NR_CPUS];
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EXPORT_SYMBOL(__per_cpu_offset);
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static void __init setup_per_cpu_areas(void)
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{
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unsigned long size, i;
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char *ptr;
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/* Copy section for each CPU (we discard the original) */
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size = ALIGN(__per_cpu_end - __per_cpu_start, SMP_CACHE_BYTES);
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#ifdef CONFIG_MODULES
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if (size < PERCPU_ENOUGH_ROOM)
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size = PERCPU_ENOUGH_ROOM;
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#endif
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ptr = alloc_bootmem(size * NR_CPUS);
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for (i = 0; i < NR_CPUS; i++, ptr += size) {
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__per_cpu_offset[i] = ptr - __per_cpu_start;
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memcpy(ptr, __per_cpu_start, __per_cpu_end - __per_cpu_start);
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}
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}
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#endif /* !__GENERIC_PER_CPU */
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/* Called by boot processor to activate the rest. */
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static void __init smp_init(void)
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{
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unsigned int i;
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/* FIXME: This should be done in userspace --RR */
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for_each_present_cpu(i) {
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if (num_online_cpus() >= max_cpus)
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break;
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if (!cpu_online(i))
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cpu_up(i);
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}
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/* Any cleanup work */
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printk(KERN_INFO "Brought up %ld CPUs\n", (long)num_online_cpus());
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smp_cpus_done(max_cpus);
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#if 0
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/* Get other processors into their bootup holding patterns. */
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smp_commence();
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#endif
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}
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#endif
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/*
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* We need to finalize in a non-__init function or else race conditions
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* between the root thread and the init thread may cause start_kernel to
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* be reaped by free_initmem before the root thread has proceeded to
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* cpu_idle.
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*
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* gcc-3.4 accidentally inlines this function, so use noinline.
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*/
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static void noinline rest_init(void)
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__releases(kernel_lock)
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{
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kernel_thread(init, NULL, CLONE_FS | CLONE_SIGHAND);
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numa_default_policy();
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unlock_kernel();
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/*
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* The boot idle thread must execute schedule()
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* at least one to get things moving:
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*/
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preempt_enable_no_resched();
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schedule();
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preempt_disable();
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/* Call into cpu_idle with preempt disabled */
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cpu_idle();
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}
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/* Check for early params. */
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static int __init do_early_param(char *param, char *val)
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{
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struct obs_kernel_param *p;
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for (p = __setup_start; p < __setup_end; p++) {
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if (p->early && strcmp(param, p->str) == 0) {
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if (p->setup_func(val) != 0)
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printk(KERN_WARNING
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"Malformed early option '%s'\n", param);
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}
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}
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/* We accept everything at this stage. */
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return 0;
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}
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/* Arch code calls this early on, or if not, just before other parsing. */
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void __init parse_early_param(void)
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{
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static __initdata int done = 0;
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static __initdata char tmp_cmdline[COMMAND_LINE_SIZE];
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if (done)
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return;
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/* All fall through to do_early_param. */
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strlcpy(tmp_cmdline, saved_command_line, COMMAND_LINE_SIZE);
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parse_args("early options", tmp_cmdline, NULL, 0, do_early_param);
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done = 1;
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}
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/*
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* Activate the first processor.
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*/
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asmlinkage void __init start_kernel(void)
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{
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char * command_line;
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extern struct kernel_param __start___param[], __stop___param[];
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/*
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* Interrupts are still disabled. Do necessary setups, then
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* enable them
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*/
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lock_kernel();
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page_address_init();
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printk(KERN_NOTICE);
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printk(linux_banner);
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setup_arch(&command_line);
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setup_per_cpu_areas();
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/*
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* Mark the boot cpu "online" so that it can call console drivers in
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* printk() and can access its per-cpu storage.
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*/
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smp_prepare_boot_cpu();
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/*
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* Set up the scheduler prior starting any interrupts (such as the
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* timer interrupt). Full topology setup happens at smp_init()
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* time - but meanwhile we still have a functioning scheduler.
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*/
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sched_init();
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/*
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* Disable preemption - early bootup scheduling is extremely
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* fragile until we cpu_idle() for the first time.
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*/
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preempt_disable();
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build_all_zonelists();
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page_alloc_init();
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printk(KERN_NOTICE "Kernel command line: %s\n", saved_command_line);
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parse_early_param();
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parse_args("Booting kernel", command_line, __start___param,
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__stop___param - __start___param,
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&unknown_bootoption);
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sort_main_extable();
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trap_init();
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rcu_init();
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init_IRQ();
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pidhash_init();
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init_timers();
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softirq_init();
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time_init();
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/*
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* HACK ALERT! This is early. We're enabling the console before
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* we've done PCI setups etc, and console_init() must be aware of
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* this. But we do want output early, in case something goes wrong.
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*/
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console_init();
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if (panic_later)
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panic(panic_later, panic_param);
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profile_init();
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local_irq_enable();
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#ifdef CONFIG_BLK_DEV_INITRD
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if (initrd_start && !initrd_below_start_ok &&
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initrd_start < min_low_pfn << PAGE_SHIFT) {
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printk(KERN_CRIT "initrd overwritten (0x%08lx < 0x%08lx) - "
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"disabling it.\n",initrd_start,min_low_pfn << PAGE_SHIFT);
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initrd_start = 0;
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}
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#endif
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vfs_caches_init_early();
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mem_init();
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kmem_cache_init();
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setup_per_cpu_pageset();
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numa_policy_init();
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if (late_time_init)
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late_time_init();
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calibrate_delay();
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pidmap_init();
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pgtable_cache_init();
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prio_tree_init();
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anon_vma_init();
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#ifdef CONFIG_X86
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if (efi_enabled)
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efi_enter_virtual_mode();
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#endif
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fork_init(num_physpages);
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proc_caches_init();
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buffer_init();
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unnamed_dev_init();
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key_init();
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security_init();
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vfs_caches_init(num_physpages);
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radix_tree_init();
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signals_init();
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/* rootfs populating might need page-writeback */
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page_writeback_init();
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#ifdef CONFIG_PROC_FS
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proc_root_init();
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|
#endif
|
|
cpuset_init();
|
|
|
|
check_bugs();
|
|
|
|
acpi_early_init(); /* before LAPIC and SMP init */
|
|
|
|
/* Do the rest non-__init'ed, we're now alive */
|
|
rest_init();
|
|
}
|
|
|
|
static int __initdata initcall_debug;
|
|
|
|
static int __init initcall_debug_setup(char *str)
|
|
{
|
|
initcall_debug = 1;
|
|
return 1;
|
|
}
|
|
__setup("initcall_debug", initcall_debug_setup);
|
|
|
|
struct task_struct *child_reaper = &init_task;
|
|
|
|
extern initcall_t __initcall_start[], __initcall_end[];
|
|
|
|
static void __init do_initcalls(void)
|
|
{
|
|
initcall_t *call;
|
|
int count = preempt_count();
|
|
|
|
for (call = __initcall_start; call < __initcall_end; call++) {
|
|
char *msg;
|
|
|
|
if (initcall_debug) {
|
|
printk(KERN_DEBUG "Calling initcall 0x%p", *call);
|
|
print_fn_descriptor_symbol(": %s()", (unsigned long) *call);
|
|
printk("\n");
|
|
}
|
|
|
|
(*call)();
|
|
|
|
msg = NULL;
|
|
if (preempt_count() != count) {
|
|
msg = "preemption imbalance";
|
|
preempt_count() = count;
|
|
}
|
|
if (irqs_disabled()) {
|
|
msg = "disabled interrupts";
|
|
local_irq_enable();
|
|
}
|
|
if (msg) {
|
|
printk(KERN_WARNING "error in initcall at 0x%p: "
|
|
"returned with %s\n", *call, msg);
|
|
}
|
|
}
|
|
|
|
/* Make sure there is no pending stuff from the initcall sequence */
|
|
flush_scheduled_work();
|
|
}
|
|
|
|
/*
|
|
* Ok, the machine is now initialized. None of the devices
|
|
* have been touched yet, but the CPU subsystem is up and
|
|
* running, and memory and process management works.
|
|
*
|
|
* Now we can finally start doing some real work..
|
|
*/
|
|
static void __init do_basic_setup(void)
|
|
{
|
|
/* drivers will send hotplug events */
|
|
init_workqueues();
|
|
usermodehelper_init();
|
|
driver_init();
|
|
|
|
#ifdef CONFIG_SYSCTL
|
|
sysctl_init();
|
|
#endif
|
|
|
|
do_initcalls();
|
|
}
|
|
|
|
static void do_pre_smp_initcalls(void)
|
|
{
|
|
extern int spawn_ksoftirqd(void);
|
|
#ifdef CONFIG_SMP
|
|
extern int migration_init(void);
|
|
|
|
migration_init();
|
|
#endif
|
|
spawn_ksoftirqd();
|
|
spawn_softlockup_task();
|
|
}
|
|
|
|
static void run_init_process(char *init_filename)
|
|
{
|
|
argv_init[0] = init_filename;
|
|
execve(init_filename, argv_init, envp_init);
|
|
}
|
|
|
|
static inline void fixup_cpu_present_map(void)
|
|
{
|
|
#ifdef CONFIG_SMP
|
|
int i;
|
|
|
|
/*
|
|
* If arch is not hotplug ready and did not populate
|
|
* cpu_present_map, just make cpu_present_map same as cpu_possible_map
|
|
* for other cpu bringup code to function as normal. e.g smp_init() etc.
|
|
*/
|
|
if (cpus_empty(cpu_present_map)) {
|
|
for_each_cpu(i) {
|
|
cpu_set(i, cpu_present_map);
|
|
}
|
|
}
|
|
#endif
|
|
}
|
|
|
|
static int init(void * unused)
|
|
{
|
|
lock_kernel();
|
|
/*
|
|
* init can run on any cpu.
|
|
*/
|
|
set_cpus_allowed(current, CPU_MASK_ALL);
|
|
/*
|
|
* Tell the world that we're going to be the grim
|
|
* reaper of innocent orphaned children.
|
|
*
|
|
* We don't want people to have to make incorrect
|
|
* assumptions about where in the task array this
|
|
* can be found.
|
|
*/
|
|
child_reaper = current;
|
|
|
|
/* Sets up cpus_possible() */
|
|
smp_prepare_cpus(max_cpus);
|
|
|
|
do_pre_smp_initcalls();
|
|
|
|
fixup_cpu_present_map();
|
|
smp_init();
|
|
sched_init_smp();
|
|
|
|
cpuset_init_smp();
|
|
|
|
/*
|
|
* Do this before initcalls, because some drivers want to access
|
|
* firmware files.
|
|
*/
|
|
populate_rootfs();
|
|
|
|
do_basic_setup();
|
|
|
|
/*
|
|
* check if there is an early userspace init. If yes, let it do all
|
|
* the work
|
|
*/
|
|
|
|
if (!ramdisk_execute_command)
|
|
ramdisk_execute_command = "/init";
|
|
|
|
if (sys_access((const char __user *) ramdisk_execute_command, 0) != 0) {
|
|
ramdisk_execute_command = NULL;
|
|
prepare_namespace();
|
|
}
|
|
|
|
/*
|
|
* Ok, we have completed the initial bootup, and
|
|
* we're essentially up and running. Get rid of the
|
|
* initmem segments and start the user-mode stuff..
|
|
*/
|
|
free_initmem();
|
|
unlock_kernel();
|
|
mark_rodata_ro();
|
|
system_state = SYSTEM_RUNNING;
|
|
numa_default_policy();
|
|
|
|
if (sys_open((const char __user *) "/dev/console", O_RDWR, 0) < 0)
|
|
printk(KERN_WARNING "Warning: unable to open an initial console.\n");
|
|
|
|
(void) sys_dup(0);
|
|
(void) sys_dup(0);
|
|
|
|
if (ramdisk_execute_command) {
|
|
run_init_process(ramdisk_execute_command);
|
|
printk(KERN_WARNING "Failed to execute %s\n",
|
|
ramdisk_execute_command);
|
|
}
|
|
|
|
/*
|
|
* 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) {
|
|
run_init_process(execute_command);
|
|
printk(KERN_WARNING "Failed to execute %s. Attempting "
|
|
"defaults...\n", execute_command);
|
|
}
|
|
run_init_process("/sbin/init");
|
|
run_init_process("/etc/init");
|
|
run_init_process("/bin/init");
|
|
run_init_process("/bin/sh");
|
|
|
|
panic("No init found. Try passing init= option to kernel.");
|
|
}
|