| /* |
| * linux/init/main.c |
| * |
| * Copyright (C) 1991, 1992 Linus Torvalds |
| * |
| * GK 2/5/95 - Changed to support mounting root fs via NFS |
| * Added initrd & change_root: Werner Almesberger & Hans Lermen, Feb '96 |
| * Moan early if gcc is old, avoiding bogus kernels - Paul Gortmaker, May '96 |
| * Simplified starting of init: Michael A. Griffith <grif@acm.org> |
| */ |
| |
| #include <linux/types.h> |
| #include <linux/module.h> |
| #include <linux/proc_fs.h> |
| #include <linux/kernel.h> |
| #include <linux/syscalls.h> |
| #include <linux/stackprotector.h> |
| #include <linux/string.h> |
| #include <linux/ctype.h> |
| #include <linux/delay.h> |
| #include <linux/ioport.h> |
| #include <linux/init.h> |
| #include <linux/initrd.h> |
| #include <linux/bootmem.h> |
| #include <linux/acpi.h> |
| #include <linux/tty.h> |
| #include <linux/percpu.h> |
| #include <linux/kmod.h> |
| #include <linux/vmalloc.h> |
| #include <linux/kernel_stat.h> |
| #include <linux/start_kernel.h> |
| #include <linux/security.h> |
| #include <linux/smp.h> |
| #include <linux/profile.h> |
| #include <linux/rcupdate.h> |
| #include <linux/moduleparam.h> |
| #include <linux/kallsyms.h> |
| #include <linux/writeback.h> |
| #include <linux/cpu.h> |
| #include <linux/cpuset.h> |
| #include <linux/cgroup.h> |
| #include <linux/efi.h> |
| #include <linux/tick.h> |
| #include <linux/interrupt.h> |
| #include <linux/taskstats_kern.h> |
| #include <linux/delayacct.h> |
| #include <linux/unistd.h> |
| #include <linux/rmap.h> |
| #include <linux/mempolicy.h> |
| #include <linux/key.h> |
| #include <linux/buffer_head.h> |
| #include <linux/page_cgroup.h> |
| #include <linux/debug_locks.h> |
| #include <linux/debugobjects.h> |
| #include <linux/lockdep.h> |
| #include <linux/kmemleak.h> |
| #include <linux/pid_namespace.h> |
| #include <linux/device.h> |
| #include <linux/kthread.h> |
| #include <linux/sched.h> |
| #include <linux/signal.h> |
| #include <linux/idr.h> |
| #include <linux/kgdb.h> |
| #include <linux/ftrace.h> |
| #include <linux/async.h> |
| #include <linux/kmemcheck.h> |
| #include <linux/sfi.h> |
| #include <linux/shmem_fs.h> |
| #include <linux/slab.h> |
| #include <linux/perf_event.h> |
| #include <linux/file.h> |
| |
| #include <asm/io.h> |
| #include <asm/bugs.h> |
| #include <asm/setup.h> |
| #include <asm/sections.h> |
| #include <asm/cacheflush.h> |
| |
| #ifdef CONFIG_X86_LOCAL_APIC |
| #include <asm/smp.h> |
| #endif |
| |
| static int kernel_init(void *); |
| |
| extern void init_IRQ(void); |
| extern void fork_init(unsigned long); |
| extern void mca_init(void); |
| extern void sbus_init(void); |
| extern void prio_tree_init(void); |
| extern void radix_tree_init(void); |
| #ifndef CONFIG_DEBUG_RODATA |
| static inline void mark_rodata_ro(void) { } |
| #endif |
| |
| #ifdef CONFIG_TC |
| extern void tc_init(void); |
| #endif |
| |
| /* |
| * Debug helper: via this flag we know that we are in 'early bootup code' |
| * where only the boot processor is running with IRQ disabled. This means |
| * two things - IRQ must not be enabled before the flag is cleared and some |
| * operations which are not allowed with IRQ disabled are allowed while the |
| * flag is set. |
| */ |
| bool early_boot_irqs_disabled __read_mostly; |
| |
| enum system_states system_state __read_mostly; |
| EXPORT_SYMBOL(system_state); |
| |
| /* |
| * Boot command-line arguments |
| */ |
| #define MAX_INIT_ARGS CONFIG_INIT_ENV_ARG_LIMIT |
| #define MAX_INIT_ENVS CONFIG_INIT_ENV_ARG_LIMIT |
| |
| extern void time_init(void); |
| /* Default late time init is NULL. archs can override this later. */ |
| void (*__initdata late_time_init)(void); |
| extern void softirq_init(void); |
| |
| /* Untouched command line saved by arch-specific code. */ |
| char __initdata boot_command_line[COMMAND_LINE_SIZE]; |
| /* Untouched saved command line (eg. for /proc) */ |
| char *saved_command_line; |
| /* Command line for parameter parsing */ |
| static char *static_command_line; |
| |
| static char *execute_command; |
| static char *ramdisk_execute_command; |
| |
| /* |
| * If set, this is an indication to the drivers that reset the underlying |
| * device before going ahead with the initialization otherwise driver might |
| * rely on the BIOS and skip the reset operation. |
| * |
| * This is useful if kernel is booting in an unreliable environment. |
| * For ex. kdump situaiton where previous kernel has crashed, BIOS has been |
| * skipped and devices will be in unknown state. |
| */ |
| unsigned int reset_devices; |
| EXPORT_SYMBOL(reset_devices); |
| |
| static int __init set_reset_devices(char *str) |
| { |
| reset_devices = 1; |
| return 1; |
| } |
| |
| __setup("reset_devices", set_reset_devices); |
| |
| static const char * argv_init[MAX_INIT_ARGS+2] = { "init", NULL, }; |
| const char * envp_init[MAX_INIT_ENVS+2] = { "HOME=/", "TERM=linux", NULL, }; |
| static const char *panic_later, *panic_param; |
| |
| extern const struct obs_kernel_param __setup_start[], __setup_end[]; |
| |
| static int __init obsolete_checksetup(char *line) |
| { |
| const struct obs_kernel_param *p; |
| int had_early_param = 0; |
| |
| p = __setup_start; |
| do { |
| int n = strlen(p->str); |
| if (parameqn(line, p->str, n)) { |
| if (p->early) { |
| /* Already done in parse_early_param? |
| * (Needs exact match on param part). |
| * Keep iterating, as we can have early |
| * params and __setups of same names 8( */ |
| if (line[n] == '\0' || line[n] == '=') |
| had_early_param = 1; |
| } else if (!p->setup_func) { |
| printk(KERN_WARNING "Parameter %s is obsolete," |
| " ignored\n", p->str); |
| return 1; |
| } else if (p->setup_func(line + n)) |
| return 1; |
| } |
| p++; |
| } while (p < __setup_end); |
| |
| return had_early_param; |
| } |
| |
| /* |
| * 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_jiffy = (1<<12); |
| |
| EXPORT_SYMBOL(loops_per_jiffy); |
| |
| static int __init debug_kernel(char *str) |
| { |
| console_loglevel = 10; |
| return 0; |
| } |
| |
| static int __init quiet_kernel(char *str) |
| { |
| console_loglevel = 4; |
| return 0; |
| } |
| |
| early_param("debug", debug_kernel); |
| early_param("quiet", quiet_kernel); |
| |
| static int __init loglevel(char *str) |
| { |
| int newlevel; |
| |
| /* |
| * Only update loglevel value when a correct setting was passed, |
| * to prevent blind crashes (when loglevel being set to 0) that |
| * are quite hard to debug |
| */ |
| if (get_option(&str, &newlevel)) { |
| console_loglevel = newlevel; |
| return 0; |
| } |
| |
| return -EINVAL; |
| } |
| |
| early_param("loglevel", loglevel); |
| |
| /* Change NUL term back to "=", to make "param" the whole string. */ |
| static int __init repair_env_string(char *param, char *val, const char *unused) |
| { |
| if (val) { |
| /* param=val or param="val"? */ |
| if (val == param+strlen(param)+1) |
| val[-1] = '='; |
| else if (val == param+strlen(param)+2) { |
| val[-2] = '='; |
| memmove(val-1, val, strlen(val)+1); |
| val--; |
| } else |
| BUG(); |
| } |
| return 0; |
| } |
| |
| /* |
| * Unknown boot options get handed to init, unless they look like |
| * unused parameters (modprobe will find them in /proc/cmdline). |
| */ |
| static int __init unknown_bootoption(char *param, char *val, const char *unused) |
| { |
| repair_env_string(param, val, unused); |
| |
| /* Handle obsolete-style parameters */ |
| if (obsolete_checksetup(param)) |
| return 0; |
| |
| /* Unused module parameter. */ |
| if (strchr(param, '.') && (!val || strchr(param, '.') < val)) |
| return 0; |
| |
| if (panic_later) |
| return 0; |
| |
| if (val) { |
| /* Environment option */ |
| unsigned int i; |
| for (i = 0; envp_init[i]; i++) { |
| if (i == MAX_INIT_ENVS) { |
| panic_later = "Too many boot env vars at `%s'"; |
| panic_param = param; |
| } |
| if (!strncmp(param, envp_init[i], val - param)) |
| break; |
| } |
| envp_init[i] = param; |
| } else { |
| /* Command line option */ |
| unsigned int i; |
| for (i = 0; argv_init[i]; i++) { |
| if (i == MAX_INIT_ARGS) { |
| panic_later = "Too many boot init vars at `%s'"; |
| panic_param = param; |
| } |
| } |
| argv_init[i] = param; |
| } |
| return 0; |
| } |
| |
| static int __init init_setup(char *str) |
| { |
| unsigned int i; |
| |
| execute_command = str; |
| /* |
| * 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] |
| */ |
| for (i = 1; i < MAX_INIT_ARGS; i++) |
| argv_init[i] = NULL; |
| return 1; |
| } |
| __setup("init=", init_setup); |
| |
| static int __init rdinit_setup(char *str) |
| { |
| unsigned int i; |
| |
| ramdisk_execute_command = str; |
| /* See "auto" comment in init_setup */ |
| for (i = 1; i < MAX_INIT_ARGS; i++) |
| argv_init[i] = NULL; |
| return 1; |
| } |
| __setup("rdinit=", rdinit_setup); |
| |
| #ifndef CONFIG_SMP |
| static const unsigned int setup_max_cpus = NR_CPUS; |
| #ifdef CONFIG_X86_LOCAL_APIC |
| static void __init smp_init(void) |
| { |
| APIC_init_uniprocessor(); |
| } |
| #else |
| #define smp_init() do { } while (0) |
| #endif |
| |
| static inline void setup_nr_cpu_ids(void) { } |
| static inline void smp_prepare_cpus(unsigned int maxcpus) { } |
| #endif |
| |
| /* |
| * We need to store the untouched command line for future reference. |
| * We also need to store the touched command line since the parameter |
| * parsing is performed in place, and we should allow a component to |
| * store reference of name/value for future reference. |
| */ |
| static void __init setup_command_line(char *command_line) |
| { |
| saved_command_line = alloc_bootmem(strlen (boot_command_line)+1); |
| static_command_line = alloc_bootmem(strlen (command_line)+1); |
| strcpy (saved_command_line, boot_command_line); |
| strcpy (static_command_line, command_line); |
| } |
| |
| /* |
| * We need to finalize in a non-__init function or else race conditions |
| * between the root thread and the init thread may cause start_kernel to |
| * be reaped by free_initmem before the root thread has proceeded to |
| * cpu_idle. |
| * |
| * gcc-3.4 accidentally inlines this function, so use noinline. |
| */ |
| |
| static __initdata DECLARE_COMPLETION(kthreadd_done); |
| |
| static noinline void __init_refok rest_init(void) |
| { |
| int pid; |
| |
| rcu_scheduler_starting(); |
| /* |
| * We need to spawn init first so that it obtains pid 1, however |
| * the init task will end up wanting to create kthreads, which, if |
| * we schedule it before we create kthreadd, will OOPS. |
| */ |
| kernel_thread(kernel_init, NULL, CLONE_FS | CLONE_SIGHAND); |
| numa_default_policy(); |
| pid = kernel_thread(kthreadd, NULL, CLONE_FS | CLONE_FILES); |
| rcu_read_lock(); |
| kthreadd_task = find_task_by_pid_ns(pid, &init_pid_ns); |
| rcu_read_unlock(); |
| complete(&kthreadd_done); |
| |
| /* |
| * The boot idle thread must execute schedule() |
| * at least once to get things moving: |
| */ |
| init_idle_bootup_task(current); |
| schedule_preempt_disabled(); |
| /* Call into cpu_idle with preempt disabled */ |
| cpu_idle(); |
| } |
| |
| /* Check for early params. */ |
| static int __init do_early_param(char *param, char *val, const char *unused) |
| { |
| const struct obs_kernel_param *p; |
| |
| for (p = __setup_start; p < __setup_end; p++) { |
| if ((p->early && parameq(param, p->str)) || |
| (strcmp(param, "console") == 0 && |
| strcmp(p->str, "earlycon") == 0) |
| ) { |
| if (p->setup_func(val) != 0) |
| printk(KERN_WARNING |
| "Malformed early option '%s'\n", param); |
| } |
| } |
| /* We accept everything at this stage. */ |
| return 0; |
| } |
| |
| void __init parse_early_options(char *cmdline) |
| { |
| parse_args("early options", cmdline, NULL, 0, 0, 0, do_early_param); |
| } |
| |
| /* Arch code calls this early on, or if not, just before other parsing. */ |
| void __init parse_early_param(void) |
| { |
| static __initdata int done = 0; |
| static __initdata char tmp_cmdline[COMMAND_LINE_SIZE]; |
| |
| if (done) |
| return; |
| |
| /* All fall through to do_early_param. */ |
| strlcpy(tmp_cmdline, boot_command_line, COMMAND_LINE_SIZE); |
| parse_early_options(tmp_cmdline); |
| done = 1; |
| } |
| |
| /* |
| * Activate the first processor. |
| */ |
| |
| static void __init boot_cpu_init(void) |
| { |
| int cpu = smp_processor_id(); |
| /* Mark the boot cpu "present", "online" etc for SMP and UP case */ |
| set_cpu_online(cpu, true); |
| set_cpu_active(cpu, true); |
| set_cpu_present(cpu, true); |
| set_cpu_possible(cpu, true); |
| } |
| |
| void __init __weak smp_setup_processor_id(void) |
| { |
| } |
| |
| void __init __weak thread_info_cache_init(void) |
| { |
| } |
| |
| /* |
| * Set up kernel memory allocators |
| */ |
| static void __init mm_init(void) |
| { |
| /* |
| * page_cgroup requires contiguous pages, |
| * bigger than MAX_ORDER unless SPARSEMEM. |
| */ |
| page_cgroup_init_flatmem(); |
| mem_init(); |
| kmem_cache_init(); |
| percpu_init_late(); |
| pgtable_cache_init(); |
| vmalloc_init(); |
| } |
| |
| asmlinkage void __init start_kernel(void) |
| { |
| char * command_line; |
| extern const struct kernel_param __start___param[], __stop___param[]; |
| |
| /* |
| * Need to run as early as possible, to initialize the |
| * lockdep hash: |
| */ |
| lockdep_init(); |
| smp_setup_processor_id(); |
| debug_objects_early_init(); |
| |
| /* |
| * Set up the the initial canary ASAP: |
| */ |
| boot_init_stack_canary(); |
| |
| cgroup_init_early(); |
| |
| local_irq_disable(); |
| early_boot_irqs_disabled = true; |
| |
| /* |
| * Interrupts are still disabled. Do necessary setups, then |
| * enable them |
| */ |
| tick_init(); |
| boot_cpu_init(); |
| page_address_init(); |
| printk(KERN_NOTICE "%s", linux_banner); |
| setup_arch(&command_line); |
| mm_init_owner(&init_mm, &init_task); |
| mm_init_cpumask(&init_mm); |
| setup_command_line(command_line); |
| setup_nr_cpu_ids(); |
| setup_per_cpu_areas(); |
| smp_prepare_boot_cpu(); /* arch-specific boot-cpu hooks */ |
| |
| build_all_zonelists(NULL, NULL); |
| page_alloc_init(); |
| |
| printk(KERN_NOTICE "Kernel command line: %s\n", boot_command_line); |
| parse_early_param(); |
| parse_args("Booting kernel", static_command_line, __start___param, |
| __stop___param - __start___param, |
| -1, -1, &unknown_bootoption); |
| |
| jump_label_init(); |
| |
| /* |
| * These use large bootmem allocations and must precede |
| * kmem_cache_init() |
| */ |
| setup_log_buf(0); |
| pidhash_init(); |
| vfs_caches_init_early(); |
| sort_main_extable(); |
| trap_init(); |
| mm_init(); |
| |
| /* |
| * Set up the scheduler prior starting any interrupts (such as the |
| * timer interrupt). Full topology setup happens at smp_init() |
| * time - but meanwhile we still have a functioning scheduler. |
| */ |
| sched_init(); |
| /* |
| * Disable preemption - early bootup scheduling is extremely |
| * fragile until we cpu_idle() for the first time. |
| */ |
| preempt_disable(); |
| if (!irqs_disabled()) { |
| printk(KERN_WARNING "start_kernel(): bug: interrupts were " |
| "enabled *very* early, fixing it\n"); |
| local_irq_disable(); |
| } |
| idr_init_cache(); |
| perf_event_init(); |
| rcu_init(); |
| radix_tree_init(); |
| /* init some links before init_ISA_irqs() */ |
| early_irq_init(); |
| init_IRQ(); |
| prio_tree_init(); |
| init_timers(); |
| hrtimers_init(); |
| softirq_init(); |
| timekeeping_init(); |
| time_init(); |
| profile_init(); |
| call_function_init(); |
| if (!irqs_disabled()) |
| printk(KERN_CRIT "start_kernel(): bug: interrupts were " |
| "enabled early\n"); |
| early_boot_irqs_disabled = false; |
| local_irq_enable(); |
| |
| kmem_cache_init_late(); |
| |
| /* |
| * HACK ALERT! This is early. We're enabling the console before |
| * we've done PCI setups etc, and console_init() must be aware of |
| * this. But we do want output early, in case something goes wrong. |
| */ |
| console_init(); |
| if (panic_later) |
| panic(panic_later, panic_param); |
| |
| lockdep_info(); |
| |
| /* |
| * Need to run this when irqs are enabled, because it wants |
| * to self-test [hard/soft]-irqs on/off lock inversion bugs |
| * too: |
| */ |
| locking_selftest(); |
| |
| #ifdef CONFIG_BLK_DEV_INITRD |
| if (initrd_start && !initrd_below_start_ok && |
| page_to_pfn(virt_to_page((void *)initrd_start)) < min_low_pfn) { |
| printk(KERN_CRIT "initrd overwritten (0x%08lx < 0x%08lx) - " |
| "disabling it.\n", |
| page_to_pfn(virt_to_page((void *)initrd_start)), |
| min_low_pfn); |
| initrd_start = 0; |
| } |
| #endif |
| page_cgroup_init(); |
| debug_objects_mem_init(); |
| kmemleak_init(); |
| setup_per_cpu_pageset(); |
| numa_policy_init(); |
| if (late_time_init) |
| late_time_init(); |
| sched_clock_init(); |
| calibrate_delay(); |
| pidmap_init(); |
| anon_vma_init(); |
| #ifdef CONFIG_X86 |
| if (efi_enabled) |
| efi_enter_virtual_mode(); |
| #endif |
| thread_info_cache_init(); |
| cred_init(); |
| fork_init(totalram_pages); |
| proc_caches_init(); |
| buffer_init(); |
| key_init(); |
| security_init(); |
| dbg_late_init(); |
| vfs_caches_init(totalram_pages); |
| signals_init(); |
| /* rootfs populating might need page-writeback */ |
| page_writeback_init(); |
| #ifdef CONFIG_PROC_FS |
| proc_root_init(); |
| #endif |
| cgroup_init(); |
| cpuset_init(); |
| taskstats_init_early(); |
| delayacct_init(); |
| |
| check_bugs(); |
| |
| acpi_early_init(); /* before LAPIC and SMP init */ |
| sfi_init_late(); |
| |
| if (efi_enabled) |
| efi_free_boot_services(); |
| |
| ftrace_init(); |
| |
| /* Do the rest non-__init'ed, we're now alive */ |
| rest_init(); |
| } |
| |
| /* Call all constructor functions linked into the kernel. */ |
| static void __init do_ctors(void) |
| { |
| #ifdef CONFIG_CONSTRUCTORS |
| ctor_fn_t *fn = (ctor_fn_t *) __ctors_start; |
| |
| for (; fn < (ctor_fn_t *) __ctors_end; fn++) |
| (*fn)(); |
| #endif |
| } |
| |
| bool initcall_debug; |
| core_param(initcall_debug, initcall_debug, bool, 0644); |
| |
| static char msgbuf[64]; |
| |
| static int __init_or_module do_one_initcall_debug(initcall_t fn) |
| { |
| ktime_t calltime, delta, rettime; |
| unsigned long long duration; |
| int ret; |
| |
| printk(KERN_DEBUG "calling %pF @ %i\n", fn, task_pid_nr(current)); |
| calltime = ktime_get(); |
| ret = fn(); |
| rettime = ktime_get(); |
| delta = ktime_sub(rettime, calltime); |
| duration = (unsigned long long) ktime_to_ns(delta) >> 10; |
| printk(KERN_DEBUG "initcall %pF returned %d after %lld usecs\n", fn, |
| ret, duration); |
| |
| return ret; |
| } |
| |
| int __init_or_module do_one_initcall(initcall_t fn) |
| { |
| int count = preempt_count(); |
| int ret; |
| |
| if (initcall_debug) |
| ret = do_one_initcall_debug(fn); |
| else |
| ret = fn(); |
| |
| msgbuf[0] = 0; |
| |
| if (ret && ret != -ENODEV && initcall_debug) |
| sprintf(msgbuf, "error code %d ", ret); |
| |
| if (preempt_count() != count) { |
| strlcat(msgbuf, "preemption imbalance ", sizeof(msgbuf)); |
| preempt_count() = count; |
| } |
| if (irqs_disabled()) { |
| strlcat(msgbuf, "disabled interrupts ", sizeof(msgbuf)); |
| local_irq_enable(); |
| } |
| if (msgbuf[0]) { |
| printk("initcall %pF returned with %s\n", fn, msgbuf); |
| } |
| |
| return ret; |
| } |
| |
| |
| extern initcall_t __initcall_start[]; |
| extern initcall_t __initcall0_start[]; |
| extern initcall_t __initcall1_start[]; |
| extern initcall_t __initcall2_start[]; |
| extern initcall_t __initcall3_start[]; |
| extern initcall_t __initcall4_start[]; |
| extern initcall_t __initcall5_start[]; |
| extern initcall_t __initcall6_start[]; |
| extern initcall_t __initcall7_start[]; |
| extern initcall_t __initcall_end[]; |
| |
| static initcall_t *initcall_levels[] __initdata = { |
| __initcall0_start, |
| __initcall1_start, |
| __initcall2_start, |
| __initcall3_start, |
| __initcall4_start, |
| __initcall5_start, |
| __initcall6_start, |
| __initcall7_start, |
| __initcall_end, |
| }; |
| |
| /* Keep these in sync with initcalls in include/linux/init.h */ |
| static char *initcall_level_names[] __initdata = { |
| "early", |
| "core", |
| "postcore", |
| "arch", |
| "subsys", |
| "fs", |
| "device", |
| "late", |
| }; |
| |
| static void __init do_initcall_level(int level) |
| { |
| extern const struct kernel_param __start___param[], __stop___param[]; |
| initcall_t *fn; |
| |
| strcpy(static_command_line, saved_command_line); |
| parse_args(initcall_level_names[level], |
| static_command_line, __start___param, |
| __stop___param - __start___param, |
| level, level, |
| &repair_env_string); |
| |
| for (fn = initcall_levels[level]; fn < initcall_levels[level+1]; fn++) |
| do_one_initcall(*fn); |
| } |
| |
| static void __init do_initcalls(void) |
| { |
| int level; |
| |
| for (level = 0; level < ARRAY_SIZE(initcall_levels) - 1; level++) |
| do_initcall_level(level); |
| } |
| |
| /* |
| * 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) |
| { |
| cpuset_init_smp(); |
| usermodehelper_init(); |
| shmem_init(); |
| driver_init(); |
| init_irq_proc(); |
| do_ctors(); |
| usermodehelper_enable(); |
| do_initcalls(); |
| } |
| |
| static void __init do_pre_smp_initcalls(void) |
| { |
| initcall_t *fn; |
| |
| for (fn = __initcall_start; fn < __initcall0_start; fn++) |
| do_one_initcall(*fn); |
| } |
| |
| static void run_init_process(const char *init_filename) |
| { |
| argv_init[0] = init_filename; |
| kernel_execve(init_filename, argv_init, envp_init); |
| } |
| |
| /* This is a non __init function. Force it to be noinline otherwise gcc |
| * makes it inline to init() and it becomes part of init.text section |
| */ |
| static noinline int init_post(void) |
| { |
| /* need to finish all async __init code before freeing the memory */ |
| async_synchronize_full(); |
| free_initmem(); |
| mark_rodata_ro(); |
| system_state = SYSTEM_RUNNING; |
| numa_default_policy(); |
| |
| current->signal->flags |= SIGNAL_UNKILLABLE; |
| flush_delayed_fput(); |
| |
| 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. " |
| "See Linux Documentation/init.txt for guidance."); |
| } |
| |
| static int __init kernel_init(void * unused) |
| { |
| /* |
| * Wait until kthreadd is all set-up. |
| */ |
| wait_for_completion(&kthreadd_done); |
| |
| /* Now the scheduler is fully set up and can do blocking allocations */ |
| gfp_allowed_mask = __GFP_BITS_MASK; |
| |
| /* |
| * init can allocate pages on any node |
| */ |
| set_mems_allowed(node_states[N_HIGH_MEMORY]); |
| /* |
| * init can run on any cpu. |
| */ |
| set_cpus_allowed_ptr(current, cpu_all_mask); |
| |
| cad_pid = task_pid(current); |
| |
| smp_prepare_cpus(setup_max_cpus); |
| |
| do_pre_smp_initcalls(); |
| lockup_detector_init(); |
| |
| smp_init(); |
| sched_init_smp(); |
| |
| do_basic_setup(); |
| |
| /* Open the /dev/console on the rootfs, this should never fail */ |
| 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); |
| /* |
| * 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.. |
| */ |
| |
| init_post(); |
| return 0; |
| } |