Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/init/main.c |
| 3 | * |
| 4 | * Copyright (C) 1991, 1992 Linus Torvalds |
| 5 | * |
| 6 | * GK 2/5/95 - Changed to support mounting root fs via NFS |
| 7 | * Added initrd & change_root: Werner Almesberger & Hans Lermen, Feb '96 |
| 8 | * Moan early if gcc is old, avoiding bogus kernels - Paul Gortmaker, May '96 |
| 9 | * Simplified starting of init: Michael A. Griffith <grif@acm.org> |
| 10 | */ |
| 11 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 12 | #include <linux/types.h> |
| 13 | #include <linux/module.h> |
| 14 | #include <linux/proc_fs.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 15 | #include <linux/kernel.h> |
| 16 | #include <linux/syscalls.h> |
Ingo Molnar | 9b5609f | 2008-02-14 09:41:09 +0100 | [diff] [blame] | 17 | #include <linux/stackprotector.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | #include <linux/string.h> |
| 19 | #include <linux/ctype.h> |
| 20 | #include <linux/delay.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 21 | #include <linux/ioport.h> |
| 22 | #include <linux/init.h> |
| 23 | #include <linux/smp_lock.h> |
| 24 | #include <linux/initrd.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | #include <linux/bootmem.h> |
Len Brown | 4a7a16d | 2009-06-12 20:42:08 -0400 | [diff] [blame] | 26 | #include <linux/acpi.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 27 | #include <linux/tty.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | #include <linux/percpu.h> |
| 29 | #include <linux/kmod.h> |
Nick Piggin | db64fe0 | 2008-10-18 20:27:03 -0700 | [diff] [blame] | 30 | #include <linux/vmalloc.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | #include <linux/kernel_stat.h> |
Rusty Russell | d7cd561 | 2006-12-07 02:14:08 +0100 | [diff] [blame] | 32 | #include <linux/start_kernel.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | #include <linux/security.h> |
Jens Axboe | 3d44223 | 2008-06-26 11:21:34 +0200 | [diff] [blame] | 34 | #include <linux/smp.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | #include <linux/workqueue.h> |
| 36 | #include <linux/profile.h> |
| 37 | #include <linux/rcupdate.h> |
| 38 | #include <linux/moduleparam.h> |
| 39 | #include <linux/kallsyms.h> |
| 40 | #include <linux/writeback.h> |
| 41 | #include <linux/cpu.h> |
| 42 | #include <linux/cpuset.h> |
Paul Menage | ddbcc7e | 2007-10-18 23:39:30 -0700 | [diff] [blame] | 43 | #include <linux/cgroup.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 44 | #include <linux/efi.h> |
Thomas Gleixner | 906568c | 2007-02-16 01:28:01 -0800 | [diff] [blame] | 45 | #include <linux/tick.h> |
Andrew Morton | 6168a70 | 2007-02-17 21:22:39 -0800 | [diff] [blame] | 46 | #include <linux/interrupt.h> |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 47 | #include <linux/taskstats_kern.h> |
Shailabh Nagar | ca74e92 | 2006-07-14 00:24:36 -0700 | [diff] [blame] | 48 | #include <linux/delayacct.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 49 | #include <linux/unistd.h> |
| 50 | #include <linux/rmap.h> |
| 51 | #include <linux/mempolicy.h> |
| 52 | #include <linux/key.h> |
Adrian Bunk | b6cd0b7 | 2006-06-27 02:53:54 -0700 | [diff] [blame] | 53 | #include <linux/buffer_head.h> |
KAMEZAWA Hiroyuki | 94b6da5 | 2008-10-22 14:15:05 -0700 | [diff] [blame] | 54 | #include <linux/page_cgroup.h> |
Ingo Molnar | 9a11b49a | 2006-07-03 00:24:33 -0700 | [diff] [blame] | 55 | #include <linux/debug_locks.h> |
Thomas Gleixner | 3ac7fe5 | 2008-04-30 00:55:01 -0700 | [diff] [blame] | 56 | #include <linux/debugobjects.h> |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 57 | #include <linux/lockdep.h> |
Catalin Marinas | 3c7b4e6 | 2009-06-11 13:22:39 +0100 | [diff] [blame] | 58 | #include <linux/kmemleak.h> |
Sukadev Bhattiprolu | 84d7378 | 2006-12-08 02:38:01 -0800 | [diff] [blame] | 59 | #include <linux/pid_namespace.h> |
Adrian Bunk | 1f21782 | 2006-12-19 13:01:28 -0800 | [diff] [blame] | 60 | #include <linux/device.h> |
Eric W. Biederman | 73c2799 | 2007-05-09 02:34:32 -0700 | [diff] [blame] | 61 | #include <linux/kthread.h> |
Adrian Bunk | e6fe664 | 2007-11-09 22:39:39 +0100 | [diff] [blame] | 62 | #include <linux/sched.h> |
Adrian Bunk | a1c9eea | 2008-02-06 01:36:44 -0800 | [diff] [blame] | 63 | #include <linux/signal.h> |
Akinobu Mita | 199f0ca | 2008-04-29 01:03:13 -0700 | [diff] [blame] | 64 | #include <linux/idr.h> |
Jason Wessel | 0b4b382 | 2010-05-20 21:04:29 -0500 | [diff] [blame] | 65 | #include <linux/kgdb.h> |
Steven Rostedt | 68bf21a | 2008-08-14 15:45:08 -0400 | [diff] [blame] | 66 | #include <linux/ftrace.h> |
Arjan van de Ven | 22a9d64 | 2009-01-07 08:45:46 -0800 | [diff] [blame] | 67 | #include <linux/async.h> |
Vegard Nossum | dfec072 | 2008-04-04 00:51:41 +0200 | [diff] [blame] | 68 | #include <linux/kmemcheck.h> |
Zhaolei | 02af61b | 2009-04-10 14:26:18 +0800 | [diff] [blame] | 69 | #include <linux/kmemtrace.h> |
Feng Tang | 6ae6996 | 2009-08-14 15:13:46 -0400 | [diff] [blame] | 70 | #include <linux/sfi.h> |
Kay Sievers | 2b2af54 | 2009-04-30 15:23:42 +0200 | [diff] [blame] | 71 | #include <linux/shmem_fs.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 72 | #include <linux/slab.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 73 | |
| 74 | #include <asm/io.h> |
| 75 | #include <asm/bugs.h> |
| 76 | #include <asm/setup.h> |
Andi Kleen | a940199 | 2005-07-28 21:15:30 -0700 | [diff] [blame] | 77 | #include <asm/sections.h> |
Arjan van de Ven | 37b73c8 | 2006-01-06 00:12:01 -0800 | [diff] [blame] | 78 | #include <asm/cacheflush.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 79 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 80 | #ifdef CONFIG_X86_LOCAL_APIC |
| 81 | #include <asm/smp.h> |
| 82 | #endif |
| 83 | |
Sam Ravnborg | aae5f66 | 2007-02-26 16:45:41 +0100 | [diff] [blame] | 84 | static int kernel_init(void *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 85 | |
| 86 | extern void init_IRQ(void); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 87 | extern void fork_init(unsigned long); |
| 88 | extern void mca_init(void); |
| 89 | extern void sbus_init(void); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 90 | extern void prio_tree_init(void); |
| 91 | extern void radix_tree_init(void); |
| 92 | extern void free_initmem(void); |
Arjan van de Ven | 37b73c8 | 2006-01-06 00:12:01 -0800 | [diff] [blame] | 93 | #ifndef CONFIG_DEBUG_RODATA |
| 94 | static inline void mark_rodata_ro(void) { } |
| 95 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 96 | |
| 97 | #ifdef CONFIG_TC |
| 98 | extern void tc_init(void); |
| 99 | #endif |
| 100 | |
Paul E. McKenney | a682604 | 2009-02-25 18:03:42 -0800 | [diff] [blame] | 101 | enum system_states system_state __read_mostly; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | EXPORT_SYMBOL(system_state); |
| 103 | |
| 104 | /* |
| 105 | * Boot command-line arguments |
| 106 | */ |
| 107 | #define MAX_INIT_ARGS CONFIG_INIT_ENV_ARG_LIMIT |
| 108 | #define MAX_INIT_ENVS CONFIG_INIT_ENV_ARG_LIMIT |
| 109 | |
| 110 | extern void time_init(void); |
| 111 | /* Default late time init is NULL. archs can override this later. */ |
Jan Beulich | d2e3192 | 2009-01-06 14:41:10 -0800 | [diff] [blame] | 112 | void (*__initdata late_time_init)(void); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 113 | extern void softirq_init(void); |
| 114 | |
Alon Bar-Lev | 30d7e0d | 2007-02-12 00:53:52 -0800 | [diff] [blame] | 115 | /* Untouched command line saved by arch-specific code. */ |
| 116 | char __initdata boot_command_line[COMMAND_LINE_SIZE]; |
| 117 | /* Untouched saved command line (eg. for /proc) */ |
| 118 | char *saved_command_line; |
| 119 | /* Command line for parameter parsing */ |
| 120 | static char *static_command_line; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 121 | |
| 122 | static char *execute_command; |
Olof Johansson | ffdfc40 | 2005-09-06 15:17:19 -0700 | [diff] [blame] | 123 | static char *ramdisk_execute_command; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 124 | |
Jan Beulich | 8b3b295 | 2007-07-15 23:41:07 -0700 | [diff] [blame] | 125 | #ifdef CONFIG_SMP |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 126 | /* Setup configured maximum number of CPUs to activate */ |
Andi Kleen | ca74a6f | 2008-01-30 13:33:17 +0100 | [diff] [blame] | 127 | unsigned int __initdata setup_max_cpus = NR_CPUS; |
Vivek Goyal | 7e96287 | 2006-09-27 01:50:44 -0700 | [diff] [blame] | 128 | |
| 129 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 130 | * Setup routine for controlling SMP activation |
| 131 | * |
| 132 | * Command-line option of "nosmp" or "maxcpus=0" will disable SMP |
| 133 | * activation entirely (the MPS table probe still happens, though). |
| 134 | * |
| 135 | * Command-line option of "maxcpus=<NUM>", where <NUM> is an integer |
| 136 | * greater than 0, limits the maximum number of CPUs activated in |
| 137 | * SMP mode to <NUM>. |
| 138 | */ |
Ingo Molnar | 65a4e57 | 2009-01-31 03:36:17 +0100 | [diff] [blame] | 139 | |
| 140 | void __weak arch_disable_smp_support(void) { } |
Len Brown | 61ec756 | 2007-08-16 03:34:22 -0400 | [diff] [blame] | 141 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 142 | static int __init nosmp(char *str) |
| 143 | { |
Andi Kleen | ca74a6f | 2008-01-30 13:33:17 +0100 | [diff] [blame] | 144 | setup_max_cpus = 0; |
Ingo Molnar | 65a4e57 | 2009-01-31 03:36:17 +0100 | [diff] [blame] | 145 | arch_disable_smp_support(); |
| 146 | |
Jan Beulich | 8b3b295 | 2007-07-15 23:41:07 -0700 | [diff] [blame] | 147 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 148 | } |
| 149 | |
Jan Beulich | 8b3b295 | 2007-07-15 23:41:07 -0700 | [diff] [blame] | 150 | early_param("nosmp", nosmp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 151 | |
Yinghai Lu | 2b633e3 | 2010-02-10 01:20:37 -0800 | [diff] [blame] | 152 | /* this is hard limit */ |
| 153 | static int __init nrcpus(char *str) |
| 154 | { |
| 155 | int nr_cpus; |
| 156 | |
| 157 | get_option(&str, &nr_cpus); |
| 158 | if (nr_cpus > 0 && nr_cpus < nr_cpu_ids) |
| 159 | nr_cpu_ids = nr_cpus; |
| 160 | |
| 161 | return 0; |
| 162 | } |
| 163 | |
| 164 | early_param("nr_cpus", nrcpus); |
| 165 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 166 | static int __init maxcpus(char *str) |
| 167 | { |
Andi Kleen | ca74a6f | 2008-01-30 13:33:17 +0100 | [diff] [blame] | 168 | get_option(&str, &setup_max_cpus); |
| 169 | if (setup_max_cpus == 0) |
Ingo Molnar | 65a4e57 | 2009-01-31 03:36:17 +0100 | [diff] [blame] | 170 | arch_disable_smp_support(); |
Len Brown | 61ec756 | 2007-08-16 03:34:22 -0400 | [diff] [blame] | 171 | |
| 172 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 173 | } |
| 174 | |
Hugh Dickins | 8134097 | 2007-08-27 16:02:12 +0100 | [diff] [blame] | 175 | early_param("maxcpus", maxcpus); |
Jan Beulich | 8b3b295 | 2007-07-15 23:41:07 -0700 | [diff] [blame] | 176 | #else |
H Hartley Sweeten | 7463e63 | 2010-03-05 13:42:46 -0800 | [diff] [blame] | 177 | static const unsigned int setup_max_cpus = NR_CPUS; |
Jan Beulich | 8b3b295 | 2007-07-15 23:41:07 -0700 | [diff] [blame] | 178 | #endif |
| 179 | |
| 180 | /* |
| 181 | * If set, this is an indication to the drivers that reset the underlying |
| 182 | * device before going ahead with the initialization otherwise driver might |
| 183 | * rely on the BIOS and skip the reset operation. |
| 184 | * |
| 185 | * This is useful if kernel is booting in an unreliable environment. |
| 186 | * For ex. kdump situaiton where previous kernel has crashed, BIOS has been |
| 187 | * skipped and devices will be in unknown state. |
| 188 | */ |
| 189 | unsigned int reset_devices; |
| 190 | EXPORT_SYMBOL(reset_devices); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 191 | |
Vivek Goyal | 7e96287 | 2006-09-27 01:50:44 -0700 | [diff] [blame] | 192 | static int __init set_reset_devices(char *str) |
| 193 | { |
| 194 | reset_devices = 1; |
| 195 | return 1; |
| 196 | } |
| 197 | |
| 198 | __setup("reset_devices", set_reset_devices); |
| 199 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 200 | static char * argv_init[MAX_INIT_ARGS+2] = { "init", NULL, }; |
| 201 | char * envp_init[MAX_INIT_ENVS+2] = { "HOME=/", "TERM=linux", NULL, }; |
| 202 | static const char *panic_later, *panic_param; |
| 203 | |
| 204 | extern struct obs_kernel_param __setup_start[], __setup_end[]; |
| 205 | |
| 206 | static int __init obsolete_checksetup(char *line) |
| 207 | { |
| 208 | struct obs_kernel_param *p; |
Rusty Russell | 33df0d1 | 2006-09-26 10:52:32 +0200 | [diff] [blame] | 209 | int had_early_param = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 210 | |
| 211 | p = __setup_start; |
| 212 | do { |
| 213 | int n = strlen(p->str); |
| 214 | if (!strncmp(line, p->str, n)) { |
| 215 | if (p->early) { |
Rusty Russell | 33df0d1 | 2006-09-26 10:52:32 +0200 | [diff] [blame] | 216 | /* Already done in parse_early_param? |
| 217 | * (Needs exact match on param part). |
| 218 | * Keep iterating, as we can have early |
| 219 | * params and __setups of same names 8( */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 220 | if (line[n] == '\0' || line[n] == '=') |
Rusty Russell | 33df0d1 | 2006-09-26 10:52:32 +0200 | [diff] [blame] | 221 | had_early_param = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 222 | } else if (!p->setup_func) { |
| 223 | printk(KERN_WARNING "Parameter %s is obsolete," |
| 224 | " ignored\n", p->str); |
| 225 | return 1; |
| 226 | } else if (p->setup_func(line + n)) |
| 227 | return 1; |
| 228 | } |
| 229 | p++; |
| 230 | } while (p < __setup_end); |
Rusty Russell | 33df0d1 | 2006-09-26 10:52:32 +0200 | [diff] [blame] | 231 | |
| 232 | return had_early_param; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 233 | } |
| 234 | |
| 235 | /* |
| 236 | * This should be approx 2 Bo*oMips to start (note initial shift), and will |
| 237 | * still work even if initially too large, it will just take slightly longer |
| 238 | */ |
| 239 | unsigned long loops_per_jiffy = (1<<12); |
| 240 | |
| 241 | EXPORT_SYMBOL(loops_per_jiffy); |
| 242 | |
| 243 | static int __init debug_kernel(char *str) |
| 244 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 245 | console_loglevel = 10; |
Yinghai Lu | f6f21c81 | 2008-02-08 04:21:58 -0800 | [diff] [blame] | 246 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 247 | } |
| 248 | |
| 249 | static int __init quiet_kernel(char *str) |
| 250 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 251 | console_loglevel = 4; |
Yinghai Lu | f6f21c81 | 2008-02-08 04:21:58 -0800 | [diff] [blame] | 252 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 253 | } |
| 254 | |
Yinghai Lu | f6f21c81 | 2008-02-08 04:21:58 -0800 | [diff] [blame] | 255 | early_param("debug", debug_kernel); |
| 256 | early_param("quiet", quiet_kernel); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 257 | |
| 258 | static int __init loglevel(char *str) |
| 259 | { |
| 260 | get_option(&str, &console_loglevel); |
Alex Riesen | d9d4fcf | 2008-03-04 14:28:31 -0800 | [diff] [blame] | 261 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 262 | } |
| 263 | |
Yinghai Lu | f6f21c81 | 2008-02-08 04:21:58 -0800 | [diff] [blame] | 264 | early_param("loglevel", loglevel); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 265 | |
| 266 | /* |
| 267 | * Unknown boot options get handed to init, unless they look like |
Rusty Russell | f066a4f | 2009-12-01 14:56:44 +1030 | [diff] [blame] | 268 | * unused parameters (modprobe will find them in /proc/cmdline). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 269 | */ |
| 270 | static int __init unknown_bootoption(char *param, char *val) |
| 271 | { |
| 272 | /* Change NUL term back to "=", to make "param" the whole string. */ |
| 273 | if (val) { |
| 274 | /* param=val or param="val"? */ |
| 275 | if (val == param+strlen(param)+1) |
| 276 | val[-1] = '='; |
| 277 | else if (val == param+strlen(param)+2) { |
| 278 | val[-2] = '='; |
| 279 | memmove(val-1, val, strlen(val)+1); |
| 280 | val--; |
| 281 | } else |
| 282 | BUG(); |
| 283 | } |
| 284 | |
| 285 | /* Handle obsolete-style parameters */ |
| 286 | if (obsolete_checksetup(param)) |
| 287 | return 0; |
| 288 | |
Rusty Russell | f066a4f | 2009-12-01 14:56:44 +1030 | [diff] [blame] | 289 | /* Unused module parameter. */ |
| 290 | if (strchr(param, '.') && (!val || strchr(param, '.') < val)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 291 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 292 | |
| 293 | if (panic_later) |
| 294 | return 0; |
| 295 | |
| 296 | if (val) { |
| 297 | /* Environment option */ |
| 298 | unsigned int i; |
| 299 | for (i = 0; envp_init[i]; i++) { |
| 300 | if (i == MAX_INIT_ENVS) { |
| 301 | panic_later = "Too many boot env vars at `%s'"; |
| 302 | panic_param = param; |
| 303 | } |
| 304 | if (!strncmp(param, envp_init[i], val - param)) |
| 305 | break; |
| 306 | } |
| 307 | envp_init[i] = param; |
| 308 | } else { |
| 309 | /* Command line option */ |
| 310 | unsigned int i; |
| 311 | for (i = 0; argv_init[i]; i++) { |
| 312 | if (i == MAX_INIT_ARGS) { |
| 313 | panic_later = "Too many boot init vars at `%s'"; |
| 314 | panic_param = param; |
| 315 | } |
| 316 | } |
| 317 | argv_init[i] = param; |
| 318 | } |
| 319 | return 0; |
| 320 | } |
| 321 | |
Ingo Molnar | 12d6f21 | 2008-01-30 13:33:58 +0100 | [diff] [blame] | 322 | #ifdef CONFIG_DEBUG_PAGEALLOC |
| 323 | int __read_mostly debug_pagealloc_enabled = 0; |
| 324 | #endif |
| 325 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 326 | static int __init init_setup(char *str) |
| 327 | { |
| 328 | unsigned int i; |
| 329 | |
| 330 | execute_command = str; |
| 331 | /* |
| 332 | * In case LILO is going to boot us with default command line, |
| 333 | * it prepends "auto" before the whole cmdline which makes |
| 334 | * the shell think it should execute a script with such name. |
| 335 | * So we ignore all arguments entered _before_ init=... [MJ] |
| 336 | */ |
| 337 | for (i = 1; i < MAX_INIT_ARGS; i++) |
| 338 | argv_init[i] = NULL; |
| 339 | return 1; |
| 340 | } |
| 341 | __setup("init=", init_setup); |
| 342 | |
Olof Johansson | ffdfc40 | 2005-09-06 15:17:19 -0700 | [diff] [blame] | 343 | static int __init rdinit_setup(char *str) |
| 344 | { |
| 345 | unsigned int i; |
| 346 | |
| 347 | ramdisk_execute_command = str; |
| 348 | /* See "auto" comment in init_setup */ |
| 349 | for (i = 1; i < MAX_INIT_ARGS; i++) |
| 350 | argv_init[i] = NULL; |
| 351 | return 1; |
| 352 | } |
| 353 | __setup("rdinit=", rdinit_setup); |
| 354 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 355 | #ifndef CONFIG_SMP |
| 356 | |
| 357 | #ifdef CONFIG_X86_LOCAL_APIC |
| 358 | static void __init smp_init(void) |
| 359 | { |
| 360 | APIC_init_uniprocessor(); |
| 361 | } |
| 362 | #else |
| 363 | #define smp_init() do { } while (0) |
| 364 | #endif |
| 365 | |
Mike Travis | e0982e9 | 2008-03-26 14:23:48 -0700 | [diff] [blame] | 366 | static inline void setup_nr_cpu_ids(void) { } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 367 | static inline void smp_prepare_cpus(unsigned int maxcpus) { } |
| 368 | |
| 369 | #else |
| 370 | |
Mike Travis | e0982e9 | 2008-03-26 14:23:48 -0700 | [diff] [blame] | 371 | /* Setup number of possible processor ids */ |
| 372 | int nr_cpu_ids __read_mostly = NR_CPUS; |
| 373 | EXPORT_SYMBOL(nr_cpu_ids); |
| 374 | |
| 375 | /* An arch may set nr_cpu_ids earlier if needed, so this would be redundant */ |
| 376 | static void __init setup_nr_cpu_ids(void) |
| 377 | { |
Rusty Russell | e0c0ba7 | 2009-01-01 10:12:19 +1030 | [diff] [blame] | 378 | nr_cpu_ids = find_last_bit(cpumask_bits(cpu_possible_mask),NR_CPUS) + 1; |
Mike Travis | e0982e9 | 2008-03-26 14:23:48 -0700 | [diff] [blame] | 379 | } |
| 380 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 381 | /* Called by boot processor to activate the rest. */ |
| 382 | static void __init smp_init(void) |
| 383 | { |
Christoph Lameter | 53b8a31 | 2007-02-20 13:57:51 -0800 | [diff] [blame] | 384 | unsigned int cpu; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 385 | |
| 386 | /* FIXME: This should be done in userspace --RR */ |
Christoph Lameter | 53b8a31 | 2007-02-20 13:57:51 -0800 | [diff] [blame] | 387 | for_each_present_cpu(cpu) { |
Andi Kleen | ca74a6f | 2008-01-30 13:33:17 +0100 | [diff] [blame] | 388 | if (num_online_cpus() >= setup_max_cpus) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 389 | break; |
Christoph Lameter | 53b8a31 | 2007-02-20 13:57:51 -0800 | [diff] [blame] | 390 | if (!cpu_online(cpu)) |
| 391 | cpu_up(cpu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 392 | } |
| 393 | |
| 394 | /* Any cleanup work */ |
| 395 | printk(KERN_INFO "Brought up %ld CPUs\n", (long)num_online_cpus()); |
Andi Kleen | ca74a6f | 2008-01-30 13:33:17 +0100 | [diff] [blame] | 396 | smp_cpus_done(setup_max_cpus); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 397 | } |
| 398 | |
| 399 | #endif |
| 400 | |
| 401 | /* |
Alon Bar-Lev | 30d7e0d | 2007-02-12 00:53:52 -0800 | [diff] [blame] | 402 | * We need to store the untouched command line for future reference. |
| 403 | * We also need to store the touched command line since the parameter |
| 404 | * parsing is performed in place, and we should allow a component to |
| 405 | * store reference of name/value for future reference. |
| 406 | */ |
| 407 | static void __init setup_command_line(char *command_line) |
| 408 | { |
| 409 | saved_command_line = alloc_bootmem(strlen (boot_command_line)+1); |
| 410 | static_command_line = alloc_bootmem(strlen (command_line)+1); |
| 411 | strcpy (saved_command_line, boot_command_line); |
| 412 | strcpy (static_command_line, command_line); |
| 413 | } |
| 414 | |
| 415 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 416 | * We need to finalize in a non-__init function or else race conditions |
| 417 | * between the root thread and the init thread may cause start_kernel to |
| 418 | * be reaped by free_initmem before the root thread has proceeded to |
| 419 | * cpu_idle. |
| 420 | * |
| 421 | * gcc-3.4 accidentally inlines this function, so use noinline. |
| 422 | */ |
| 423 | |
Rakib Mullick | f99ebf0 | 2009-01-06 14:40:38 -0800 | [diff] [blame] | 424 | static noinline void __init_refok rest_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 425 | __releases(kernel_lock) |
| 426 | { |
Eric W. Biederman | 73c2799 | 2007-05-09 02:34:32 -0700 | [diff] [blame] | 427 | int pid; |
| 428 | |
Paul E. McKenney | 7db905e | 2009-09-02 14:01:24 -0700 | [diff] [blame] | 429 | rcu_scheduler_starting(); |
Sam Ravnborg | aae5f66 | 2007-02-26 16:45:41 +0100 | [diff] [blame] | 430 | kernel_thread(kernel_init, NULL, CLONE_FS | CLONE_SIGHAND); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 431 | numa_default_policy(); |
Eric W. Biederman | 73c2799 | 2007-05-09 02:34:32 -0700 | [diff] [blame] | 432 | pid = kernel_thread(kthreadd, NULL, CLONE_FS | CLONE_FILES); |
Paul E. McKenney | d11c563 | 2010-02-22 17:04:50 -0800 | [diff] [blame] | 433 | rcu_read_lock(); |
Pavel Emelyanov | 5cd2045 | 2008-04-30 00:54:24 -0700 | [diff] [blame] | 434 | kthreadd_task = find_task_by_pid_ns(pid, &init_pid_ns); |
Paul E. McKenney | d11c563 | 2010-02-22 17:04:50 -0800 | [diff] [blame] | 435 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 436 | unlock_kernel(); |
Ingo Molnar | f340c0d | 2005-06-28 16:40:42 +0200 | [diff] [blame] | 437 | |
| 438 | /* |
| 439 | * The boot idle thread must execute schedule() |
Ingo Molnar | 1df2105 | 2007-07-09 18:51:58 +0200 | [diff] [blame] | 440 | * at least once to get things moving: |
Ingo Molnar | f340c0d | 2005-06-28 16:40:42 +0200 | [diff] [blame] | 441 | */ |
Ingo Molnar | 1df2105 | 2007-07-09 18:51:58 +0200 | [diff] [blame] | 442 | init_idle_bootup_task(current); |
Nick Piggin | 5bfb5d6 | 2005-11-08 21:39:01 -0800 | [diff] [blame] | 443 | preempt_enable_no_resched(); |
Ingo Molnar | f340c0d | 2005-06-28 16:40:42 +0200 | [diff] [blame] | 444 | schedule(); |
Nick Piggin | 5bfb5d6 | 2005-11-08 21:39:01 -0800 | [diff] [blame] | 445 | preempt_disable(); |
Ingo Molnar | f340c0d | 2005-06-28 16:40:42 +0200 | [diff] [blame] | 446 | |
Nick Piggin | 5bfb5d6 | 2005-11-08 21:39:01 -0800 | [diff] [blame] | 447 | /* Call into cpu_idle with preempt disabled */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 448 | cpu_idle(); |
Ingo Molnar | 1df2105 | 2007-07-09 18:51:58 +0200 | [diff] [blame] | 449 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 450 | |
| 451 | /* Check for early params. */ |
| 452 | static int __init do_early_param(char *param, char *val) |
| 453 | { |
| 454 | struct obs_kernel_param *p; |
| 455 | |
| 456 | for (p = __setup_start; p < __setup_end; p++) { |
Yinghai Lu | 18a8bd9 | 2007-07-15 23:37:59 -0700 | [diff] [blame] | 457 | if ((p->early && strcmp(param, p->str) == 0) || |
| 458 | (strcmp(param, "console") == 0 && |
| 459 | strcmp(p->str, "earlycon") == 0) |
| 460 | ) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 461 | if (p->setup_func(val) != 0) |
| 462 | printk(KERN_WARNING |
| 463 | "Malformed early option '%s'\n", param); |
| 464 | } |
| 465 | } |
| 466 | /* We accept everything at this stage. */ |
| 467 | return 0; |
| 468 | } |
| 469 | |
Magnus Damm | 1397709 | 2009-03-30 14:37:25 -0700 | [diff] [blame] | 470 | void __init parse_early_options(char *cmdline) |
| 471 | { |
| 472 | parse_args("early options", cmdline, NULL, 0, do_early_param); |
| 473 | } |
| 474 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 475 | /* Arch code calls this early on, or if not, just before other parsing. */ |
| 476 | void __init parse_early_param(void) |
| 477 | { |
| 478 | static __initdata int done = 0; |
| 479 | static __initdata char tmp_cmdline[COMMAND_LINE_SIZE]; |
| 480 | |
| 481 | if (done) |
| 482 | return; |
| 483 | |
| 484 | /* All fall through to do_early_param. */ |
Alon Bar-Lev | 30d7e0d | 2007-02-12 00:53:52 -0800 | [diff] [blame] | 485 | strlcpy(tmp_cmdline, boot_command_line, COMMAND_LINE_SIZE); |
Magnus Damm | 1397709 | 2009-03-30 14:37:25 -0700 | [diff] [blame] | 486 | parse_early_options(tmp_cmdline); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 487 | done = 1; |
| 488 | } |
| 489 | |
| 490 | /* |
| 491 | * Activate the first processor. |
| 492 | */ |
| 493 | |
Stas Sergeev | 44fd229 | 2006-03-23 02:59:44 -0800 | [diff] [blame] | 494 | static void __init boot_cpu_init(void) |
| 495 | { |
| 496 | int cpu = smp_processor_id(); |
| 497 | /* Mark the boot cpu "present", "online" etc for SMP and UP case */ |
Rusty Russell | 915441b | 2009-01-01 10:12:15 +1030 | [diff] [blame] | 498 | set_cpu_online(cpu, true); |
Peter Zijlstra | 933b061 | 2009-12-16 18:04:31 +0100 | [diff] [blame] | 499 | set_cpu_active(cpu, true); |
Rusty Russell | 915441b | 2009-01-01 10:12:15 +1030 | [diff] [blame] | 500 | set_cpu_present(cpu, true); |
| 501 | set_cpu_possible(cpu, true); |
Stas Sergeev | 44fd229 | 2006-03-23 02:59:44 -0800 | [diff] [blame] | 502 | } |
| 503 | |
Benjamin Herrenschmidt | 839ad62 | 2008-04-18 16:56:18 +1000 | [diff] [blame] | 504 | void __init __weak smp_setup_processor_id(void) |
Andrew Morton | 033ab7f | 2006-06-30 01:55:50 -0700 | [diff] [blame] | 505 | { |
| 506 | } |
| 507 | |
Benjamin Herrenschmidt | 8c9843e | 2008-04-18 16:56:15 +1000 | [diff] [blame] | 508 | void __init __weak thread_info_cache_init(void) |
| 509 | { |
| 510 | } |
| 511 | |
Pekka Enberg | 444f478 | 2009-06-11 18:29:06 +0300 | [diff] [blame] | 512 | /* |
| 513 | * Set up kernel memory allocators |
| 514 | */ |
| 515 | static void __init mm_init(void) |
| 516 | { |
KAMEZAWA Hiroyuki | ca371c0 | 2009-06-12 10:33:53 +0300 | [diff] [blame] | 517 | /* |
| 518 | * page_cgroup requires countinous pages as memmap |
| 519 | * and it's bigger than MAX_ORDER unless SPARSEMEM. |
| 520 | */ |
| 521 | page_cgroup_init_flatmem(); |
Pekka Enberg | 444f478 | 2009-06-11 18:29:06 +0300 | [diff] [blame] | 522 | mem_init(); |
| 523 | kmem_cache_init(); |
Benjamin Herrenschmidt | c868d55 | 2009-06-17 13:48:39 +1000 | [diff] [blame] | 524 | pgtable_cache_init(); |
Pekka Enberg | 444f478 | 2009-06-11 18:29:06 +0300 | [diff] [blame] | 525 | vmalloc_init(); |
| 526 | } |
| 527 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 528 | asmlinkage void __init start_kernel(void) |
| 529 | { |
| 530 | char * command_line; |
| 531 | extern struct kernel_param __start___param[], __stop___param[]; |
Andrew Morton | 033ab7f | 2006-06-30 01:55:50 -0700 | [diff] [blame] | 532 | |
| 533 | smp_setup_processor_id(); |
| 534 | |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 535 | /* |
| 536 | * Need to run as early as possible, to initialize the |
| 537 | * lockdep hash: |
| 538 | */ |
| 539 | lockdep_init(); |
Thomas Gleixner | 3ac7fe5 | 2008-04-30 00:55:01 -0700 | [diff] [blame] | 540 | debug_objects_early_init(); |
Ingo Molnar | 4205942 | 2008-02-14 09:44:08 +0100 | [diff] [blame] | 541 | |
| 542 | /* |
| 543 | * Set up the the initial canary ASAP: |
| 544 | */ |
| 545 | boot_init_stack_canary(); |
| 546 | |
Paul Menage | ddbcc7e | 2007-10-18 23:39:30 -0700 | [diff] [blame] | 547 | cgroup_init_early(); |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 548 | |
| 549 | local_irq_disable(); |
| 550 | early_boot_irqs_off(); |
Ingo Molnar | 243c762 | 2006-07-03 00:25:06 -0700 | [diff] [blame] | 551 | early_init_irq_lock_class(); |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 552 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 553 | /* |
| 554 | * Interrupts are still disabled. Do necessary setups, then |
| 555 | * enable them |
| 556 | */ |
| 557 | lock_kernel(); |
Thomas Gleixner | 906568c | 2007-02-16 01:28:01 -0800 | [diff] [blame] | 558 | tick_init(); |
Stas Sergeev | 44fd229 | 2006-03-23 02:59:44 -0800 | [diff] [blame] | 559 | boot_cpu_init(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 560 | page_address_init(); |
Alex Riesen | 657cafa | 2009-05-24 15:30:48 +0200 | [diff] [blame] | 561 | printk(KERN_NOTICE "%s", linux_banner); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 562 | setup_arch(&command_line); |
Balbir Singh | cf475ad | 2008-04-29 01:00:16 -0700 | [diff] [blame] | 563 | mm_init_owner(&init_mm, &init_task); |
Alon Bar-Lev | 30d7e0d | 2007-02-12 00:53:52 -0800 | [diff] [blame] | 564 | setup_command_line(command_line); |
Mike Travis | e0982e9 | 2008-03-26 14:23:48 -0700 | [diff] [blame] | 565 | setup_nr_cpu_ids(); |
Tejun Heo | d6647bd | 2009-07-21 17:11:50 +0900 | [diff] [blame] | 566 | setup_per_cpu_areas(); |
Stas Sergeev | 44fd229 | 2006-03-23 02:59:44 -0800 | [diff] [blame] | 567 | smp_prepare_boot_cpu(); /* arch-specific boot-cpu hooks */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 568 | |
Haicheng Li | 1f52250 | 2010-05-24 14:32:51 -0700 | [diff] [blame] | 569 | build_all_zonelists(NULL); |
Pekka Enberg | 83b519e | 2009-06-10 19:40:04 +0300 | [diff] [blame] | 570 | page_alloc_init(); |
| 571 | |
| 572 | printk(KERN_NOTICE "Kernel command line: %s\n", boot_command_line); |
| 573 | parse_early_param(); |
| 574 | parse_args("Booting kernel", static_command_line, __start___param, |
| 575 | __stop___param - __start___param, |
| 576 | &unknown_bootoption); |
| 577 | /* |
| 578 | * These use large bootmem allocations and must precede |
| 579 | * kmem_cache_init() |
| 580 | */ |
| 581 | pidhash_init(); |
Pekka Enberg | 83b519e | 2009-06-10 19:40:04 +0300 | [diff] [blame] | 582 | vfs_caches_init_early(); |
| 583 | sort_main_extable(); |
| 584 | trap_init(); |
Pekka Enberg | 444f478 | 2009-06-11 18:29:06 +0300 | [diff] [blame] | 585 | mm_init(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 586 | /* |
| 587 | * Set up the scheduler prior starting any interrupts (such as the |
| 588 | * timer interrupt). Full topology setup happens at smp_init() |
| 589 | * time - but meanwhile we still have a functioning scheduler. |
| 590 | */ |
| 591 | sched_init(); |
| 592 | /* |
| 593 | * Disable preemption - early bootup scheduling is extremely |
| 594 | * fragile until we cpu_idle() for the first time. |
| 595 | */ |
| 596 | preempt_disable(); |
Ard van Breemen | c4a6830 | 2007-01-05 16:36:19 -0800 | [diff] [blame] | 597 | if (!irqs_disabled()) { |
| 598 | printk(KERN_WARNING "start_kernel(): bug: interrupts were " |
| 599 | "enabled *very* early, fixing it\n"); |
| 600 | local_irq_disable(); |
| 601 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 602 | rcu_init(); |
Yinghai Lu | 773e3eb | 2010-02-10 01:20:33 -0800 | [diff] [blame] | 603 | radix_tree_init(); |
Yinghai Lu | 0b8f1ef | 2008-12-05 18:58:31 -0800 | [diff] [blame] | 604 | /* init some links before init_ISA_irqs() */ |
| 605 | early_irq_init(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 606 | init_IRQ(); |
Catalin Marinas | 3c7b4e6 | 2009-06-11 13:22:39 +0100 | [diff] [blame] | 607 | prio_tree_init(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 608 | init_timers(); |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 609 | hrtimers_init(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 610 | softirq_init(); |
john stultz | ad59617 | 2006-06-26 00:25:06 -0700 | [diff] [blame] | 611 | timekeeping_init(); |
john stultz | 88fecaa | 2006-07-03 00:24:04 -0700 | [diff] [blame] | 612 | time_init(); |
Heiko Carstens | 93e0281 | 2006-07-03 00:24:24 -0700 | [diff] [blame] | 613 | profile_init(); |
| 614 | if (!irqs_disabled()) |
Ron Lee | 24d431d | 2008-11-27 02:31:57 +1030 | [diff] [blame] | 615 | printk(KERN_CRIT "start_kernel(): bug: interrupts were " |
| 616 | "enabled early\n"); |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 617 | early_boot_irqs_on(); |
Heiko Carstens | 93e0281 | 2006-07-03 00:24:24 -0700 | [diff] [blame] | 618 | local_irq_enable(); |
Benjamin Herrenschmidt | dcce284 | 2009-06-18 13:24:12 +1000 | [diff] [blame] | 619 | |
| 620 | /* Interrupts are enabled now so all GFP allocations are safe. */ |
Rafael J. Wysocki | 452aa69 | 2010-03-05 13:42:13 -0800 | [diff] [blame] | 621 | gfp_allowed_mask = __GFP_BITS_MASK; |
Benjamin Herrenschmidt | dcce284 | 2009-06-18 13:24:12 +1000 | [diff] [blame] | 622 | |
Pekka Enberg | 7e85ee0 | 2009-06-12 14:03:06 +0300 | [diff] [blame] | 623 | kmem_cache_init_late(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 624 | |
| 625 | /* |
| 626 | * HACK ALERT! This is early. We're enabling the console before |
| 627 | * we've done PCI setups etc, and console_init() must be aware of |
| 628 | * this. But we do want output early, in case something goes wrong. |
| 629 | */ |
| 630 | console_init(); |
| 631 | if (panic_later) |
| 632 | panic(panic_later, panic_param); |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 633 | |
| 634 | lockdep_info(); |
| 635 | |
Ingo Molnar | 9a11b49a | 2006-07-03 00:24:33 -0700 | [diff] [blame] | 636 | /* |
| 637 | * Need to run this when irqs are enabled, because it wants |
| 638 | * to self-test [hard/soft]-irqs on/off lock inversion bugs |
| 639 | * too: |
| 640 | */ |
| 641 | locking_selftest(); |
| 642 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 643 | #ifdef CONFIG_BLK_DEV_INITRD |
| 644 | if (initrd_start && !initrd_below_start_ok && |
Geert Uytterhoeven | bd673c7 | 2008-07-29 22:33:36 -0700 | [diff] [blame] | 645 | page_to_pfn(virt_to_page((void *)initrd_start)) < min_low_pfn) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 646 | printk(KERN_CRIT "initrd overwritten (0x%08lx < 0x%08lx) - " |
Geert Uytterhoeven | fb6624e | 2008-07-17 21:16:36 +0200 | [diff] [blame] | 647 | "disabling it.\n", |
Geert Uytterhoeven | bd673c7 | 2008-07-29 22:33:36 -0700 | [diff] [blame] | 648 | page_to_pfn(virt_to_page((void *)initrd_start)), |
| 649 | min_low_pfn); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 650 | initrd_start = 0; |
| 651 | } |
| 652 | #endif |
KAMEZAWA Hiroyuki | 94b6da5 | 2008-10-22 14:15:05 -0700 | [diff] [blame] | 653 | page_cgroup_init(); |
Thomas Gleixner | a03c2a4 | 2008-02-09 23:24:09 +0100 | [diff] [blame] | 654 | enable_debug_pagealloc(); |
Eduard - Gabriel Munteanu | b9ce08c | 2008-08-10 20:14:03 +0300 | [diff] [blame] | 655 | kmemtrace_init(); |
Catalin Marinas | 3c7b4e6 | 2009-06-11 13:22:39 +0100 | [diff] [blame] | 656 | kmemleak_init(); |
Thomas Gleixner | 3ac7fe5 | 2008-04-30 00:55:01 -0700 | [diff] [blame] | 657 | debug_objects_mem_init(); |
Akinobu Mita | 199f0ca | 2008-04-29 01:03:13 -0700 | [diff] [blame] | 658 | idr_init_cache(); |
Christoph Lameter | e7c8d5c | 2005-06-21 17:14:47 -0700 | [diff] [blame] | 659 | setup_per_cpu_pageset(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 660 | numa_policy_init(); |
| 661 | if (late_time_init) |
| 662 | late_time_init(); |
Thomas Gleixner | fa84e9e | 2009-08-21 22:01:12 +0200 | [diff] [blame] | 663 | sched_clock_init(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 664 | calibrate_delay(); |
| 665 | pidmap_init(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 666 | anon_vma_init(); |
| 667 | #ifdef CONFIG_X86 |
| 668 | if (efi_enabled) |
| 669 | efi_enter_virtual_mode(); |
| 670 | #endif |
Benjamin Herrenschmidt | 8c9843e | 2008-04-18 16:56:15 +1000 | [diff] [blame] | 671 | thread_info_cache_init(); |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 672 | cred_init(); |
Jan Beulich | 4481374 | 2009-09-21 17:03:05 -0700 | [diff] [blame] | 673 | fork_init(totalram_pages); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 674 | proc_caches_init(); |
| 675 | buffer_init(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 676 | key_init(); |
| 677 | security_init(); |
Jason Wessel | 0b4b382 | 2010-05-20 21:04:29 -0500 | [diff] [blame] | 678 | dbg_late_init(); |
Jan Beulich | 4481374 | 2009-09-21 17:03:05 -0700 | [diff] [blame] | 679 | vfs_caches_init(totalram_pages); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 680 | signals_init(); |
| 681 | /* rootfs populating might need page-writeback */ |
| 682 | page_writeback_init(); |
| 683 | #ifdef CONFIG_PROC_FS |
| 684 | proc_root_init(); |
| 685 | #endif |
Paul Menage | ddbcc7e | 2007-10-18 23:39:30 -0700 | [diff] [blame] | 686 | cgroup_init(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 687 | cpuset_init(); |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 688 | taskstats_init_early(); |
Shailabh Nagar | ca74e92 | 2006-07-14 00:24:36 -0700 | [diff] [blame] | 689 | delayacct_init(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 690 | |
| 691 | check_bugs(); |
| 692 | |
| 693 | acpi_early_init(); /* before LAPIC and SMP init */ |
Feng Tang | 6ae6996 | 2009-08-14 15:13:46 -0400 | [diff] [blame] | 694 | sfi_init_late(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 695 | |
Steven Rostedt | 68bf21a | 2008-08-14 15:45:08 -0400 | [diff] [blame] | 696 | ftrace_init(); |
| 697 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 698 | /* Do the rest non-__init'ed, we're now alive */ |
| 699 | rest_init(); |
| 700 | } |
| 701 | |
Peter Oberparleiter | b99b87f | 2009-06-17 16:28:03 -0700 | [diff] [blame] | 702 | /* Call all constructor functions linked into the kernel. */ |
| 703 | static void __init do_ctors(void) |
| 704 | { |
| 705 | #ifdef CONFIG_CONSTRUCTORS |
H Hartley Sweeten | 196a15b | 2009-12-14 18:00:18 -0800 | [diff] [blame] | 706 | ctor_fn_t *fn = (ctor_fn_t *) __ctors_start; |
Peter Oberparleiter | b99b87f | 2009-06-17 16:28:03 -0700 | [diff] [blame] | 707 | |
H Hartley Sweeten | 196a15b | 2009-12-14 18:00:18 -0800 | [diff] [blame] | 708 | for (; fn < (ctor_fn_t *) __ctors_end; fn++) |
| 709 | (*fn)(); |
Peter Oberparleiter | b99b87f | 2009-06-17 16:28:03 -0700 | [diff] [blame] | 710 | #endif |
| 711 | } |
| 712 | |
Arjan van de Ven | 22a9d64 | 2009-01-07 08:45:46 -0800 | [diff] [blame] | 713 | int initcall_debug; |
Rusty Russell | d0ea3d7 | 2008-10-22 10:00:23 -0500 | [diff] [blame] | 714 | core_param(initcall_debug, initcall_debug, bool, 0644); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 715 | |
Ingo Molnar | 4a683bf | 2009-08-21 12:53:36 +0200 | [diff] [blame] | 716 | static char msgbuf[64]; |
Ingo Molnar | 4a683bf | 2009-08-21 12:53:36 +0200 | [diff] [blame] | 717 | |
Arjan van de Ven | 59f9415 | 2008-07-30 12:49:02 -0700 | [diff] [blame] | 718 | int do_one_initcall(initcall_t fn) |
Linus Torvalds | e0df154 | 2008-05-15 18:14:01 -0700 | [diff] [blame] | 719 | { |
| 720 | int count = preempt_count(); |
Frederic Weisbecker | 7423907 | 2008-11-11 23:24:42 +0100 | [diff] [blame] | 721 | ktime_t calltime, delta, rettime; |
Américo Wang | 30dbb20e | 2010-05-26 18:57:53 +0800 | [diff] [blame^] | 722 | unsigned long long duration; |
| 723 | int ret; |
Linus Torvalds | e0df154 | 2008-05-15 18:14:01 -0700 | [diff] [blame] | 724 | |
| 725 | if (initcall_debug) { |
Américo Wang | 30dbb20e | 2010-05-26 18:57:53 +0800 | [diff] [blame^] | 726 | printk("calling %pF @ %i\n", fn, task_pid_nr(current)); |
Frederic Weisbecker | 7423907 | 2008-11-11 23:24:42 +0100 | [diff] [blame] | 727 | calltime = ktime_get(); |
Linus Torvalds | e0df154 | 2008-05-15 18:14:01 -0700 | [diff] [blame] | 728 | } |
| 729 | |
Américo Wang | 30dbb20e | 2010-05-26 18:57:53 +0800 | [diff] [blame^] | 730 | ret = fn(); |
Linus Torvalds | e0df154 | 2008-05-15 18:14:01 -0700 | [diff] [blame] | 731 | |
| 732 | if (initcall_debug) { |
Frederic Weisbecker | 7423907 | 2008-11-11 23:24:42 +0100 | [diff] [blame] | 733 | rettime = ktime_get(); |
| 734 | delta = ktime_sub(rettime, calltime); |
Américo Wang | 30dbb20e | 2010-05-26 18:57:53 +0800 | [diff] [blame^] | 735 | duration = (unsigned long long) ktime_to_ns(delta) >> 10; |
| 736 | printk("initcall %pF returned %d after %lld usecs\n", fn, |
| 737 | ret, duration); |
Linus Torvalds | e0df154 | 2008-05-15 18:14:01 -0700 | [diff] [blame] | 738 | } |
| 739 | |
| 740 | msgbuf[0] = 0; |
| 741 | |
Américo Wang | 30dbb20e | 2010-05-26 18:57:53 +0800 | [diff] [blame^] | 742 | if (ret && ret != -ENODEV && initcall_debug) |
| 743 | sprintf(msgbuf, "error code %d ", ret); |
Linus Torvalds | e0df154 | 2008-05-15 18:14:01 -0700 | [diff] [blame] | 744 | |
| 745 | if (preempt_count() != count) { |
Cyrill Gorcunov | a76bfd0 | 2008-05-15 13:52:41 -0700 | [diff] [blame] | 746 | strlcat(msgbuf, "preemption imbalance ", sizeof(msgbuf)); |
Linus Torvalds | e0df154 | 2008-05-15 18:14:01 -0700 | [diff] [blame] | 747 | preempt_count() = count; |
| 748 | } |
| 749 | if (irqs_disabled()) { |
Cyrill Gorcunov | a76bfd0 | 2008-05-15 13:52:41 -0700 | [diff] [blame] | 750 | strlcat(msgbuf, "disabled interrupts ", sizeof(msgbuf)); |
Linus Torvalds | e0df154 | 2008-05-15 18:14:01 -0700 | [diff] [blame] | 751 | local_irq_enable(); |
| 752 | } |
| 753 | if (msgbuf[0]) { |
Linus Torvalds | 96d746c | 2008-10-03 13:38:07 -0700 | [diff] [blame] | 754 | printk("initcall %pF returned with %s\n", fn, msgbuf); |
Linus Torvalds | e0df154 | 2008-05-15 18:14:01 -0700 | [diff] [blame] | 755 | } |
Arjan van de Ven | 59f9415 | 2008-07-30 12:49:02 -0700 | [diff] [blame] | 756 | |
Américo Wang | 30dbb20e | 2010-05-26 18:57:53 +0800 | [diff] [blame^] | 757 | return ret; |
Linus Torvalds | e0df154 | 2008-05-15 18:14:01 -0700 | [diff] [blame] | 758 | } |
| 759 | |
| 760 | |
Eduard - Gabriel Munteanu | c2147a5 | 2008-07-25 19:45:11 -0700 | [diff] [blame] | 761 | extern initcall_t __initcall_start[], __initcall_end[], __early_initcall_end[]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 762 | |
| 763 | static void __init do_initcalls(void) |
| 764 | { |
H Hartley Sweeten | 196a15b | 2009-12-14 18:00:18 -0800 | [diff] [blame] | 765 | initcall_t *fn; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 766 | |
H Hartley Sweeten | 196a15b | 2009-12-14 18:00:18 -0800 | [diff] [blame] | 767 | for (fn = __early_initcall_end; fn < __initcall_end; fn++) |
| 768 | do_one_initcall(*fn); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 769 | |
| 770 | /* Make sure there is no pending stuff from the initcall sequence */ |
| 771 | flush_scheduled_work(); |
| 772 | } |
| 773 | |
| 774 | /* |
| 775 | * Ok, the machine is now initialized. None of the devices |
| 776 | * have been touched yet, but the CPU subsystem is up and |
| 777 | * running, and memory and process management works. |
| 778 | * |
| 779 | * Now we can finally start doing some real work.. |
| 780 | */ |
| 781 | static void __init do_basic_setup(void) |
| 782 | { |
Linus Torvalds | 4403b40 | 2008-10-25 19:53:38 -0700 | [diff] [blame] | 783 | init_workqueues(); |
Lai Jiangshan | 759ee09 | 2009-03-25 17:06:30 +0800 | [diff] [blame] | 784 | cpuset_init_smp(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 785 | usermodehelper_init(); |
Kay Sievers | 2b2af54 | 2009-04-30 15:23:42 +0200 | [diff] [blame] | 786 | init_tmpfs(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 787 | driver_init(); |
Eric W. Biederman | b04c3af | 2007-02-14 00:33:57 -0800 | [diff] [blame] | 788 | init_irq_proc(); |
Peter Oberparleiter | b99b87f | 2009-06-17 16:28:03 -0700 | [diff] [blame] | 789 | do_ctors(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 790 | do_initcalls(); |
| 791 | } |
| 792 | |
Eduard - Gabriel Munteanu | 7babe8d | 2008-07-25 19:45:11 -0700 | [diff] [blame] | 793 | static void __init do_pre_smp_initcalls(void) |
Eduard - Gabriel Munteanu | c2147a5 | 2008-07-25 19:45:11 -0700 | [diff] [blame] | 794 | { |
H Hartley Sweeten | 196a15b | 2009-12-14 18:00:18 -0800 | [diff] [blame] | 795 | initcall_t *fn; |
Eduard - Gabriel Munteanu | c2147a5 | 2008-07-25 19:45:11 -0700 | [diff] [blame] | 796 | |
H Hartley Sweeten | 196a15b | 2009-12-14 18:00:18 -0800 | [diff] [blame] | 797 | for (fn = __initcall_start; fn < __early_initcall_end; fn++) |
| 798 | do_one_initcall(*fn); |
Eduard - Gabriel Munteanu | c2147a5 | 2008-07-25 19:45:11 -0700 | [diff] [blame] | 799 | } |
| 800 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 801 | static void run_init_process(char *init_filename) |
| 802 | { |
| 803 | argv_init[0] = init_filename; |
Arnd Bergmann | 6760856 | 2006-10-02 02:18:26 -0700 | [diff] [blame] | 804 | kernel_execve(init_filename, argv_init, envp_init); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 805 | } |
| 806 | |
Vivek Goyal | ee5bfa6 | 2007-02-13 13:26:22 +0100 | [diff] [blame] | 807 | /* This is a non __init function. Force it to be noinline otherwise gcc |
| 808 | * makes it inline to init() and it becomes part of init.text section |
| 809 | */ |
Rakib Mullick | f99ebf0 | 2009-01-06 14:40:38 -0800 | [diff] [blame] | 810 | static noinline int init_post(void) |
Hannes Eder | acdd052 | 2009-03-31 15:23:50 -0700 | [diff] [blame] | 811 | __releases(kernel_lock) |
Vivek Goyal | ee5bfa6 | 2007-02-13 13:26:22 +0100 | [diff] [blame] | 812 | { |
Arjan van de Ven | 22a9d64 | 2009-01-07 08:45:46 -0800 | [diff] [blame] | 813 | /* need to finish all async __init code before freeing the memory */ |
| 814 | async_synchronize_full(); |
Vivek Goyal | ee5bfa6 | 2007-02-13 13:26:22 +0100 | [diff] [blame] | 815 | free_initmem(); |
| 816 | unlock_kernel(); |
| 817 | mark_rodata_ro(); |
| 818 | system_state = SYSTEM_RUNNING; |
| 819 | numa_default_policy(); |
| 820 | |
Vivek Goyal | ee5bfa6 | 2007-02-13 13:26:22 +0100 | [diff] [blame] | 821 | |
Oleg Nesterov | fae5fa4 | 2008-04-30 00:53:03 -0700 | [diff] [blame] | 822 | current->signal->flags |= SIGNAL_UNKILLABLE; |
| 823 | |
Vivek Goyal | ee5bfa6 | 2007-02-13 13:26:22 +0100 | [diff] [blame] | 824 | if (ramdisk_execute_command) { |
| 825 | run_init_process(ramdisk_execute_command); |
| 826 | printk(KERN_WARNING "Failed to execute %s\n", |
| 827 | ramdisk_execute_command); |
| 828 | } |
| 829 | |
| 830 | /* |
| 831 | * We try each of these until one succeeds. |
| 832 | * |
| 833 | * The Bourne shell can be used instead of init if we are |
| 834 | * trying to recover a really broken machine. |
| 835 | */ |
| 836 | if (execute_command) { |
| 837 | run_init_process(execute_command); |
| 838 | printk(KERN_WARNING "Failed to execute %s. Attempting " |
| 839 | "defaults...\n", execute_command); |
| 840 | } |
| 841 | run_init_process("/sbin/init"); |
| 842 | run_init_process("/etc/init"); |
| 843 | run_init_process("/bin/init"); |
| 844 | run_init_process("/bin/sh"); |
| 845 | |
Andreas Mohr | 9a85b8d | 2010-03-05 13:42:39 -0800 | [diff] [blame] | 846 | panic("No init found. Try passing init= option to kernel. " |
| 847 | "See Linux Documentation/init.txt for guidance."); |
Vivek Goyal | ee5bfa6 | 2007-02-13 13:26:22 +0100 | [diff] [blame] | 848 | } |
| 849 | |
Sam Ravnborg | aae5f66 | 2007-02-26 16:45:41 +0100 | [diff] [blame] | 850 | static int __init kernel_init(void * unused) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 851 | { |
| 852 | lock_kernel(); |
Miao Xie | 58568d2 | 2009-06-16 15:31:49 -0700 | [diff] [blame] | 853 | |
| 854 | /* |
| 855 | * init can allocate pages on any node |
| 856 | */ |
Miao Xie | 5ab116c | 2010-03-23 13:35:34 -0700 | [diff] [blame] | 857 | set_mems_allowed(node_states[N_HIGH_MEMORY]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 858 | /* |
| 859 | * init can run on any cpu. |
| 860 | */ |
Rusty Russell | 1a2142a | 2009-03-30 22:05:10 -0600 | [diff] [blame] | 861 | set_cpus_allowed_ptr(current, cpu_all_mask); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 862 | /* |
| 863 | * Tell the world that we're going to be the grim |
| 864 | * reaper of innocent orphaned children. |
| 865 | * |
| 866 | * We don't want people to have to make incorrect |
| 867 | * assumptions about where in the task array this |
| 868 | * can be found. |
| 869 | */ |
Sukadev Bhattiprolu | 84d7378 | 2006-12-08 02:38:01 -0800 | [diff] [blame] | 870 | init_pid_ns.child_reaper = current; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 871 | |
Cedric Le Goater | 9ec5209 | 2006-10-02 02:19:00 -0700 | [diff] [blame] | 872 | cad_pid = task_pid(current); |
| 873 | |
Andi Kleen | ca74a6f | 2008-01-30 13:33:17 +0100 | [diff] [blame] | 874 | smp_prepare_cpus(setup_max_cpus); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 875 | |
| 876 | do_pre_smp_initcalls(); |
| 877 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 878 | smp_init(); |
| 879 | sched_init_smp(); |
| 880 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 881 | do_basic_setup(); |
| 882 | |
Eric W. Biederman | 2bd3a997 | 2010-03-02 23:53:19 -0800 | [diff] [blame] | 883 | /* Open the /dev/console on the rootfs, this should never fail */ |
| 884 | if (sys_open((const char __user *) "/dev/console", O_RDWR, 0) < 0) |
| 885 | printk(KERN_WARNING "Warning: unable to open an initial console.\n"); |
| 886 | |
| 887 | (void) sys_dup(0); |
| 888 | (void) sys_dup(0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 889 | /* |
| 890 | * check if there is an early userspace init. If yes, let it do all |
| 891 | * the work |
| 892 | */ |
Olof Johansson | ffdfc40 | 2005-09-06 15:17:19 -0700 | [diff] [blame] | 893 | |
| 894 | if (!ramdisk_execute_command) |
| 895 | ramdisk_execute_command = "/init"; |
| 896 | |
| 897 | if (sys_access((const char __user *) ramdisk_execute_command, 0) != 0) { |
| 898 | ramdisk_execute_command = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 899 | prepare_namespace(); |
Olof Johansson | ffdfc40 | 2005-09-06 15:17:19 -0700 | [diff] [blame] | 900 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 901 | |
| 902 | /* |
| 903 | * Ok, we have completed the initial bootup, and |
| 904 | * we're essentially up and running. Get rid of the |
| 905 | * initmem segments and start the user-mode stuff.. |
| 906 | */ |
Frederic Weisbecker | 71566a0 | 2008-10-31 12:57:20 +0100 | [diff] [blame] | 907 | |
Vivek Goyal | ee5bfa6 | 2007-02-13 13:26:22 +0100 | [diff] [blame] | 908 | init_post(); |
| 909 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 910 | } |