4.4.2절의 (5)에서 start_kernel이 불리는데 여기 부터가 일반 적인 커널의 시작이라고 생각하면 된다.
start_kernel 전 까지는 리눅스 커널이 실행되기 위한 기본 적인 초기화 등을 해놓은 상태라고 생각하면 된다. 아래에 start_kernel()만을 발췌해 놨다. 또 커널 부팅 중 남은 기록은 5.8절를 참조 바란다.
/* * Activate the first processor. */ asmlinkage void __init start_kernel(void) { char * command_line; unsigned long mempages; extern char saved_command_line[]; /* * Interrupts are still disabled. Do necessary setups, then * enable them */ (1) lock_kernel(); (2) printk(linux_banner); (3) setup_arch(&command_line); (4) printk("Kernel command line: %s\n", saved_command_line); (5) parse_options(command_line); (6) trap_init(); (7) init_IRQ(); (8) sched_init(); (9) softirq_init(); (10) 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. */ (11) console_init(); #ifdef CONFIG_MODULES (12) init_modules(); #endif if (prof_shift) { unsigned int size; /* only text is profiled */ prof_len = (unsigned long) &_etext - (unsigned long) &_stext; prof_len >>= prof_shift; size = prof_len * sizeof(unsigned int) + PAGE_SIZE-1; prof_buffer = (unsigned int *) alloc_bootmem(size); } (13) kmem_cache_init(); (14) sti(); (15) calibrate_delay(); #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 (16) mem_init(); (17) kmem_cache_sizes_init(); pgtable_cache_init(); mempages = num_physpages; (18) fork_init(mempages); (19) proc_caches_init(); (20) vfs_caches_init(mempages); buffer_init(mempages); page_cache_init(mempages); #if defined(CONFIG_ARCH_S390) ccwcache_init(); #endif signals_init(); #ifdef CONFIG_PROC_FS proc_root_init(); #endif #if defined(CONFIG_SYSVIPC) (21) ipc_init(); #endif (22) check_bugs(); printk("POSIX conformance testing by UNIFIX\n"); /* * We count on the initial thread going ok * Like idlers init is an unlocked kernel thread, which will * make syscalls (and thus be locked). */ (23) smp_init(); (24) rest_init(); }
const char *linux_banner = "Linux version " UTS_RELEASE " (" LINUX_COMPILE_BY "@" LINUX_COMPILE_HOST ") (" LINUX_COMPILER ") " UTS_VERSION "\n";
이 내용은 부팅할 때 아래와 같이 출력되고 /var/log/dmesg의 첫 줄에 기록된다.
Linux version 2.4.16 (root@localhost) (gcc version 2.95.3 20010315 (release)) #22 2002. 02. 27. (수) 13:30:14 KST
해석된 옵션은 '='가 있으면 환경 변수로 취급되고 없으면 옵션을 처리되 환경 변수는 envp_init[]에 담기고 옵션은 argv_init[]에 담긴다.
나머지에 대해선 5.7절 참조
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5.1. 커널 시작
4.4.2절의 (5)에서 start_kernel이 불리는데 여기 부터가 일반 적인 커널의 시작이라고 생각하면 된다.
start_kernel 전 까지는 리눅스 커널이 실행되기 위한 기본 적인 초기화 등을 해놓은 상태라고 생각하면 된다. 아래에 start_kernel()만을 발췌해 놨다. 또 커널 부팅 중 남은 기록은 5.8절를 참조 바란다.
/* * Activate the first processor. */ asmlinkage void __init start_kernel(void) { char * command_line; unsigned long mempages; extern char saved_command_line[]; /* * Interrupts are still disabled. Do necessary setups, then * enable them */ (1) lock_kernel(); (2) printk(linux_banner); (3) setup_arch(&command_line); (4) printk("Kernel command line: %s\n", saved_command_line); (5) parse_options(command_line); (6) trap_init(); (7) init_IRQ(); (8) sched_init(); (9) softirq_init(); (10) 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. */ (11) console_init(); #ifdef CONFIG_MODULES (12) init_modules(); #endif if (prof_shift) { unsigned int size; /* only text is profiled */ prof_len = (unsigned long) &_etext - (unsigned long) &_stext; prof_len >>= prof_shift; size = prof_len * sizeof(unsigned int) + PAGE_SIZE-1; prof_buffer = (unsigned int *) alloc_bootmem(size); } (13) kmem_cache_init(); (14) sti(); (15) calibrate_delay(); #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 (16) mem_init(); (17) kmem_cache_sizes_init(); pgtable_cache_init(); mempages = num_physpages; (18) fork_init(mempages); (19) proc_caches_init(); (20) vfs_caches_init(mempages); buffer_init(mempages); page_cache_init(mempages); #if defined(CONFIG_ARCH_S390) ccwcache_init(); #endif signals_init(); #ifdef CONFIG_PROC_FS proc_root_init(); #endif #if defined(CONFIG_SYSVIPC) (21) ipc_init(); #endif (22) check_bugs(); printk("POSIX conformance testing by UNIFIX\n"); /* * We count on the initial thread going ok * Like idlers init is an unlocked kernel thread, which will * make syscalls (and thus be locked). */ (23) smp_init(); (24) rest_init(); }const char *linux_banner = "Linux version " UTS_RELEASE " (" LINUX_COMPILE_BY "@" LINUX_COMPILE_HOST ") (" LINUX_COMPILER ") " UTS_VERSION "\n";이 내용은 부팅할 때 아래와 같이 출력되고 /var/log/dmesg의 첫 줄에 기록된다.
해석된 옵션은 '='가 있으면 환경 변수로 취급되고 없으면 옵션을 처리되 환경 변수는 envp_init[]에 담기고 옵션은 argv_init[]에 담긴다.
나머지에 대해선 5.7절 참조
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