start_kernel() - wolf wiki

概要

• init/main.cにて定義
• カーネルをスタート？

引数

• なし

実装

/*

*	Activate the first processor.
*/

asmlinkage void __init start_kernel(void)
{

char * command_line;
extern struct kernel_param __start___param[], __stop___param[];

/*

* Interrupts are still disabled. Do necessary setups, then
* enable them
*/

• カーネルをロック？
  • lock_kernel()

lock_kernel();

• ページアドレスを起動？
  • page_address_init()

page_address_init();
printk(KERN_NOTICE);
printk(linux_banner);

• アーキテクトを起動？
  • setup_arch()

setup_arch(&command_line);

• CPUのなんかを初期化？
  • setup_per_cpu_areas()

setup_per_cpu_areas();

/*
 * Mark the boot cpu "online" so that it can call console drivers in
 * printk() and can access its per-cpu storage.
 */

• smpのCPUをブート？
  • smp_prepare_boot_cpu()

smp_prepare_boot_cpu();

/*
 * 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", saved_command_line);
parse_early_param();
parse_args("Booting kernel", command_line, __start___param,
	   __stop___param - __start___param,
	   &unknown_bootoption);
sort_main_extable();
trap_init();
rcu_init();
init_IRQ();
pidhash_init();
init_timers();
softirq_init();
time_init();

/*
 * 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);
profile_init();
local_irq_enable();

#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();
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

cpuset_init();

check_bugs();

acpi_early_init(); /* before LAPIC and SMP init */

/* Do the rest non-__init'ed, we're now alive */
rest_init();

}

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