| /* |
| * 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/string.h> |
| #include <linux/ctype.h> |
| #include <linux/delay.h> |
| #include <linux/utsname.h> |
| #include <linux/ioport.h> |
| #include <linux/init.h> |
| #include <linux/smp_lock.h> |
| #include <linux/initrd.h> |
| #include <linux/hdreg.h> |
| #include <linux/bootmem.h> |
| #include <linux/tty.h> |
| #include <linux/gfp.h> |
| #include <linux/percpu.h> |
| #include <linux/kmod.h> |
| #include <linux/kernel_stat.h> |
| #include <linux/start_kernel.h> |
| #include <linux/security.h> |
| #include <linux/workqueue.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/unwind.h> |
| #include <linux/buffer_head.h> |
| #include <linux/debug_locks.h> |
| #include <linux/debugobjects.h> |
| #include <linux/lockdep.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 <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 |
| |
| /* |
| * This is one of the first .c files built. Error out early if we have compiler |
| * trouble. |
| */ |
| |
| #if __GNUC__ == 4 && __GNUC_MINOR__ == 1 && __GNUC_PATCHLEVEL__ == 0 |
| #warning gcc-4.1.0 is known to miscompile the kernel. A different compiler version is recommended. |
| #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 pidhash_init(void); |
| extern void pidmap_init(void); |
| extern void prio_tree_init(void); |
| extern void radix_tree_init(void); |
| extern void free_initmem(void); |
| #ifdef CONFIG_ACPI |
| extern void acpi_early_init(void); |
| #else |
| static inline void acpi_early_init(void) { } |
| #endif |
| #ifndef CONFIG_DEBUG_RODATA |
| static inline void mark_rodata_ro(void) { } |
| #endif |
| |
| #ifdef CONFIG_TC |
| extern void tc_init(void); |
| #endif |
| |
| enum system_states system_state; |
| 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 (*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; |
| |
| #ifdef CONFIG_SMP |
| /* Setup configured maximum number of CPUs to activate */ |
| unsigned int __initdata setup_max_cpus = NR_CPUS; |
| |
| /* |
| * Setup routine for controlling SMP activation |
| * |
| * Command-line option of "nosmp" or "maxcpus=0" will disable SMP |
| * activation entirely (the MPS table probe still happens, though). |
| * |
| * Command-line option of "maxcpus=<NUM>", where <NUM> is an integer |
| * greater than 0, limits the maximum number of CPUs activated in |
| * SMP mode to <NUM>. |
| */ |
| #ifndef CONFIG_X86_IO_APIC |
| static inline void disable_ioapic_setup(void) {}; |
| #endif |
| |
| static int __init nosmp(char *str) |
| { |
| setup_max_cpus = 0; |
| disable_ioapic_setup(); |
| return 0; |
| } |
| |
| early_param("nosmp", nosmp); |
| |
| static int __init maxcpus(char *str) |
| { |
| get_option(&str, &setup_max_cpus); |
| if (setup_max_cpus == 0) |
| disable_ioapic_setup(); |
| |
| return 0; |
| } |
| |
| early_param("maxcpus", maxcpus); |
| #else |
| #define setup_max_cpus NR_CPUS |
| #endif |
| |
| /* |
| * 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 char * argv_init[MAX_INIT_ARGS+2] = { "init", NULL, }; |
| char * envp_init[MAX_INIT_ENVS+2] = { "HOME=/", "TERM=linux", NULL, }; |
| static const char *panic_later, *panic_param; |
| |
| extern struct obs_kernel_param __setup_start[], __setup_end[]; |
| |
| static int __init obsolete_checksetup(char *line) |
| { |
| struct obs_kernel_param *p; |
| int had_early_param = 0; |
| |
| p = __setup_start; |
| do { |
| int n = strlen(p->str); |
| if (!strncmp(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) |
| { |
| get_option(&str, &console_loglevel); |
| return 0; |
| } |
| |
| early_param("loglevel", loglevel); |
| |
| /* |
| * Unknown boot options get handed to init, unless they look like |
| * failed parameters |
| */ |
| static int __init unknown_bootoption(char *param, char *val) |
| { |
| /* Change NUL term back to "=", to make "param" the whole string. */ |
| 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(); |
| } |
| |
| /* Handle obsolete-style parameters */ |
| if (obsolete_checksetup(param)) |
| return 0; |
| |
| /* |
| * Preemptive maintenance for "why didn't my misspelled command |
| * line work?" |
| */ |
| if (strchr(param, '.') && (!val || strchr(param, '.') < val)) { |
| printk(KERN_ERR "Unknown boot option `%s': ignoring\n", param); |
| 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; |
| } |
| |
| #ifdef CONFIG_DEBUG_PAGEALLOC |
| int __read_mostly debug_pagealloc_enabled = 0; |
| #endif |
| |
| 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 |
| |
| #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_per_cpu_areas(void) { } |
| static inline void setup_nr_cpu_ids(void) { } |
| static inline void smp_prepare_cpus(unsigned int maxcpus) { } |
| |
| #else |
| |
| #if NR_CPUS > BITS_PER_LONG |
| cpumask_t cpu_mask_all __read_mostly = CPU_MASK_ALL; |
| EXPORT_SYMBOL(cpu_mask_all); |
| #endif |
| |
| /* Setup number of possible processor ids */ |
| int nr_cpu_ids __read_mostly = NR_CPUS; |
| EXPORT_SYMBOL(nr_cpu_ids); |
| |
| /* An arch may set nr_cpu_ids earlier if needed, so this would be redundant */ |
| static void __init setup_nr_cpu_ids(void) |
| { |
| int cpu, highest_cpu = 0; |
| |
| for_each_possible_cpu(cpu) |
| highest_cpu = cpu; |
| |
| nr_cpu_ids = highest_cpu + 1; |
| } |
| |
| #ifndef CONFIG_HAVE_SETUP_PER_CPU_AREA |
| unsigned long __per_cpu_offset[NR_CPUS] __read_mostly; |
| |
| EXPORT_SYMBOL(__per_cpu_offset); |
| |
| static void __init setup_per_cpu_areas(void) |
| { |
| unsigned long size, i; |
| char *ptr; |
| unsigned long nr_possible_cpus = num_possible_cpus(); |
| |
| /* Copy section for each CPU (we discard the original) */ |
| size = ALIGN(PERCPU_ENOUGH_ROOM, PAGE_SIZE); |
| ptr = alloc_bootmem_pages(size * nr_possible_cpus); |
| |
| for_each_possible_cpu(i) { |
| __per_cpu_offset[i] = ptr - __per_cpu_start; |
| memcpy(ptr, __per_cpu_start, __per_cpu_end - __per_cpu_start); |
| ptr += size; |
| } |
| } |
| #endif /* CONFIG_HAVE_SETUP_PER_CPU_AREA */ |
| |
| /* Called by boot processor to activate the rest. */ |
| static void __init smp_init(void) |
| { |
| unsigned int cpu; |
| |
| /* FIXME: This should be done in userspace --RR */ |
| for_each_present_cpu(cpu) { |
| if (num_online_cpus() >= setup_max_cpus) |
| break; |
| if (!cpu_online(cpu)) |
| cpu_up(cpu); |
| } |
| |
| /* Any cleanup work */ |
| printk(KERN_INFO "Brought up %ld CPUs\n", (long)num_online_cpus()); |
| smp_cpus_done(setup_max_cpus); |
| } |
| |
| #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 void noinline __init_refok rest_init(void) |
| __releases(kernel_lock) |
| { |
| int pid; |
| |
| kernel_thread(kernel_init, NULL, CLONE_FS | CLONE_SIGHAND); |
| numa_default_policy(); |
| pid = kernel_thread(kthreadd, NULL, CLONE_FS | CLONE_FILES); |
| kthreadd_task = find_task_by_pid_ns(pid, &init_pid_ns); |
| unlock_kernel(); |
| |
| /* |
| * The boot idle thread must execute schedule() |
| * at least once to get things moving: |
| */ |
| init_idle_bootup_task(current); |
| preempt_enable_no_resched(); |
| schedule(); |
| preempt_disable(); |
| |
| /* Call into cpu_idle with preempt disabled */ |
| cpu_idle(); |
| } |
| |
| /* Check for early params. */ |
| static int __init do_early_param(char *param, char *val) |
| { |
| struct obs_kernel_param *p; |
| |
| for (p = __setup_start; p < __setup_end; p++) { |
| if ((p->early && strcmp(param, p->str) == 0) || |
| (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; |
| } |
| |
| /* 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_args("early options", tmp_cmdline, NULL, 0, do_early_param); |
| 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 */ |
| cpu_set(cpu, cpu_online_map); |
| cpu_set(cpu, cpu_present_map); |
| cpu_set(cpu, cpu_possible_map); |
| } |
| |
| void __init __weak smp_setup_processor_id(void) |
| { |
| } |
| |
| void __init __weak thread_info_cache_init(void) |
| { |
| } |
| |
| asmlinkage void __init start_kernel(void) |
| { |
| char * command_line; |
| extern struct kernel_param __start___param[], __stop___param[]; |
| |
| smp_setup_processor_id(); |
| |
| /* |
| * Need to run as early as possible, to initialize the |
| * lockdep hash: |
| */ |
| unwind_init(); |
| lockdep_init(); |
| debug_objects_early_init(); |
| cgroup_init_early(); |
| |
| local_irq_disable(); |
| early_boot_irqs_off(); |
| early_init_irq_lock_class(); |
| |
| /* |
| * Interrupts are still disabled. Do necessary setups, then |
| * enable them |
| */ |
| lock_kernel(); |
| tick_init(); |
| boot_cpu_init(); |
| page_address_init(); |
| printk(KERN_NOTICE); |
| printk(linux_banner); |
| setup_arch(&command_line); |
| mm_init_owner(&init_mm, &init_task); |
| setup_command_line(command_line); |
| unwind_setup(); |
| setup_per_cpu_areas(); |
| setup_nr_cpu_ids(); |
| smp_prepare_boot_cpu(); /* arch-specific boot-cpu hooks */ |
| |
| /* |
| * 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(); |
| build_all_zonelists(); |
| 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, |
| &unknown_bootoption); |
| if (!irqs_disabled()) { |
| printk(KERN_WARNING "start_kernel(): bug: interrupts were " |
| "enabled *very* early, fixing it\n"); |
| local_irq_disable(); |
| } |
| sort_main_extable(); |
| trap_init(); |
| rcu_init(); |
| init_IRQ(); |
| pidhash_init(); |
| init_timers(); |
| hrtimers_init(); |
| softirq_init(); |
| timekeeping_init(); |
| time_init(); |
| sched_clock_init(); |
| profile_init(); |
| if (!irqs_disabled()) |
| printk("start_kernel(): bug: interrupts were enabled early\n"); |
| early_boot_irqs_on(); |
| local_irq_enable(); |
| |
| /* |
| * 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 && |
| initrd_start < min_low_pfn << PAGE_SHIFT) { |
| printk(KERN_CRIT "initrd overwritten (0x%08lx < 0x%08lx) - " |
| "disabling it.\n",initrd_start,min_low_pfn << PAGE_SHIFT); |
| initrd_start = 0; |
| } |
| #endif |
| vfs_caches_init_early(); |
| cpuset_init_early(); |
| mem_init(); |
| enable_debug_pagealloc(); |
| cpu_hotplug_init(); |
| kmem_cache_init(); |
| debug_objects_mem_init(); |
| idr_init_cache(); |
| setup_per_cpu_pageset(); |
| numa_policy_init(); |
| if (late_time_init) |
| late_time_init(); |
| calibrate_delay(); |
| pidmap_init(); |
| pgtable_cache_init(); |
| prio_tree_init(); |
| anon_vma_init(); |
| #ifdef CONFIG_X86 |
| if (efi_enabled) |
| efi_enter_virtual_mode(); |
| #endif |
| thread_info_cache_init(); |
| fork_init(num_physpages); |
| proc_caches_init(); |
| buffer_init(); |
| unnamed_dev_init(); |
| key_init(); |
| security_init(); |
| vfs_caches_init(num_physpages); |
| radix_tree_init(); |
| 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 */ |
| |
| /* 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); |
| |
| 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++) { |
| ktime_t t0, t1, delta; |
| char msgbuf[40]; |
| int result; |
| |
| if (initcall_debug) { |
| print_fn_descriptor_symbol("calling %s\n", *call); |
| t0 = ktime_get(); |
| } |
| |
| result = (*call)(); |
| |
| if (initcall_debug) { |
| t1 = ktime_get(); |
| delta = ktime_sub(t1, t0); |
| |
| print_fn_descriptor_symbol("initcall %s", *call); |
| printk(" returned %d after %Ld msecs\n", result, |
| (unsigned long long) delta.tv64 >> 20); |
| } |
| |
| msgbuf[0] = 0; |
| |
| if (result && result != -ENODEV && initcall_debug) |
| sprintf(msgbuf, "error code %d ", result); |
| |
| if (preempt_count() != count) { |
| strncat(msgbuf, "preemption imbalance ", sizeof(msgbuf)); |
| preempt_count() = count; |
| } |
| if (irqs_disabled()) { |
| strncat(msgbuf, "disabled interrupts ", sizeof(msgbuf)); |
| local_irq_enable(); |
| } |
| if (msgbuf[0]) { |
| print_fn_descriptor_symbol(KERN_WARNING "initcall %s", *call); |
| printk(" returned with %s\n", msgbuf); |
| } |
| } |
| |
| /* 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(); |
| init_irq_proc(); |
| do_initcalls(); |
| } |
| |
| static int __initdata nosoftlockup; |
| |
| static int __init nosoftlockup_setup(char *str) |
| { |
| nosoftlockup = 1; |
| return 1; |
| } |
| __setup("nosoftlockup", nosoftlockup_setup); |
| |
| static void __init do_pre_smp_initcalls(void) |
| { |
| extern int spawn_ksoftirqd(void); |
| |
| migration_init(); |
| spawn_ksoftirqd(); |
| if (!nosoftlockup) |
| spawn_softlockup_task(); |
| } |
| |
| static void run_init_process(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 int noinline init_post(void) |
| { |
| 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); |
| |
| current->signal->flags |= SIGNAL_UNKILLABLE; |
| |
| 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."); |
| } |
| |
| static int __init kernel_init(void * unused) |
| { |
| lock_kernel(); |
| /* |
| * init can run on any cpu. |
| */ |
| set_cpus_allowed_ptr(current, CPU_MASK_ALL_PTR); |
| /* |
| * 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. |
| */ |
| init_pid_ns.child_reaper = current; |
| |
| cad_pid = task_pid(current); |
| |
| smp_prepare_cpus(setup_max_cpus); |
| |
| do_pre_smp_initcalls(); |
| |
| smp_init(); |
| sched_init_smp(); |
| |
| cpuset_init_smp(); |
| |
| 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.. |
| */ |
| init_post(); |
| return 0; |
| } |