Subversion Repositories or1k_soc_on_altera_embedded_dev_kit

/*

 *  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/lockdep.h>

#include <linux/pid_namespace.h>

#include <linux/device.h>

#include <linux/kthread.h>

#include <linux/sched.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 signals_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 */

static unsigned int __initdata 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)

{

        max_cpus = 0;

        disable_ioapic_setup();

        return 0;

}

early_param("nosmp", nosmp);

static int __init maxcpus(char *str)

{

        get_option(&str, &max_cpus);

        if (max_cpus == 0)

                disable_ioapic_setup();

        return 0;

}

early_param("maxcpus", maxcpus);

#else

#define 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)

{

        if (*str)

                return 0;

        console_loglevel = 10;

        return 1;

}

static int __init quiet_kernel(char *str)

{

        if (*str)

                return 0;

        console_loglevel = 4;

        return 1;

}

__setup("debug", debug_kernel);

__setup("quiet", quiet_kernel);

static int __init loglevel(char *str)

{

        get_option(&str, &console_loglevel);

        return 1;

}

__setup("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;

}

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 smp_prepare_cpus(unsigned int maxcpus) { }

#else

#ifdef __GENERIC_PER_CPU

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 /* !__GENERIC_PER_CPU */

/* 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() >= 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(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(pid);

        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 __attribute__((weak)) smp_setup_processor_id(void)

{

}

asmlinkage void __init start_kernel(void)

{

        char * command_line;

        extern struct kernel_param __start___param[], __stop___param[];

        system_state = SYSTEM_BOOTING;

        smp_setup_processor_id();

        /*

         * Need to run as early as possible, to initialize the

         * lockdep hash:

         */

        unwind_init();

        lockdep_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);

        setup_command_line(command_line);

        unwind_setup();

        setup_per_cpu_areas();

        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();

        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();

        kmem_cache_init();

        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

        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 *msg = NULL;

                char msgbuf[40];

                int result;

                if (initcall_debug) {

                        printk("Calling initcall 0x%p", *call);

                        print_fn_descriptor_symbol(": %s()",

                                        (unsigned long) *call);

                        printk("\n");

                        t0 = ktime_get();

                }

                result = (*call)();

                if (initcall_debug) {

                        t1 = ktime_get();

                        delta = ktime_sub(t1, t0);

                        printk("initcall 0x%p", *call);

                        print_fn_descriptor_symbol(": %s()",

                                        (unsigned long) *call);

                        printk(" returned %d.\n", result);

                        printk("initcall 0x%p ran for %Ld msecs: ",

                                *call, (unsigned long long)delta.tv64 >> 20);

                        print_fn_descriptor_symbol("%s()\n",

                                (unsigned long) *call);

                }