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> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | #include <linux/initrd.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | #include <linux/bootmem.h> |
Len Brown | 4a7a16d | 2009-06-12 20:42:08 -0400 | [diff] [blame] | 25 | #include <linux/acpi.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | #include <linux/tty.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 27 | #include <linux/percpu.h> |
| 28 | #include <linux/kmod.h> |
Nick Piggin | db64fe0 | 2008-10-18 20:27:03 -0700 | [diff] [blame] | 29 | #include <linux/vmalloc.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | #include <linux/kernel_stat.h> |
Rusty Russell | d7cd561 | 2006-12-07 02:14:08 +0100 | [diff] [blame] | 31 | #include <linux/start_kernel.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | #include <linux/security.h> |
Jens Axboe | 3d44223 | 2008-06-26 11:21:34 +0200 | [diff] [blame] | 33 | #include <linux/smp.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | #include <linux/profile.h> |
| 35 | #include <linux/rcupdate.h> |
| 36 | #include <linux/moduleparam.h> |
| 37 | #include <linux/kallsyms.h> |
| 38 | #include <linux/writeback.h> |
| 39 | #include <linux/cpu.h> |
| 40 | #include <linux/cpuset.h> |
Paul Menage | ddbcc7e | 2007-10-18 23:39:30 -0700 | [diff] [blame] | 41 | #include <linux/cgroup.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 42 | #include <linux/efi.h> |
Thomas Gleixner | 906568c | 2007-02-16 01:28:01 -0800 | [diff] [blame] | 43 | #include <linux/tick.h> |
Andrew Morton | 6168a70 | 2007-02-17 21:22:39 -0800 | [diff] [blame] | 44 | #include <linux/interrupt.h> |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 45 | #include <linux/taskstats_kern.h> |
Shailabh Nagar | ca74e92 | 2006-07-14 00:24:36 -0700 | [diff] [blame] | 46 | #include <linux/delayacct.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | #include <linux/unistd.h> |
| 48 | #include <linux/rmap.h> |
| 49 | #include <linux/mempolicy.h> |
| 50 | #include <linux/key.h> |
Adrian Bunk | b6cd0b7 | 2006-06-27 02:53:54 -0700 | [diff] [blame] | 51 | #include <linux/buffer_head.h> |
KAMEZAWA Hiroyuki | 94b6da5 | 2008-10-22 14:15:05 -0700 | [diff] [blame] | 52 | #include <linux/page_cgroup.h> |
Ingo Molnar | 9a11b49a | 2006-07-03 00:24:33 -0700 | [diff] [blame] | 53 | #include <linux/debug_locks.h> |
Thomas Gleixner | 3ac7fe5 | 2008-04-30 00:55:01 -0700 | [diff] [blame] | 54 | #include <linux/debugobjects.h> |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 55 | #include <linux/lockdep.h> |
Catalin Marinas | 3c7b4e6 | 2009-06-11 13:22:39 +0100 | [diff] [blame] | 56 | #include <linux/kmemleak.h> |
Sukadev Bhattiprolu | 84d7378 | 2006-12-08 02:38:01 -0800 | [diff] [blame] | 57 | #include <linux/pid_namespace.h> |
Adrian Bunk | 1f21782 | 2006-12-19 13:01:28 -0800 | [diff] [blame] | 58 | #include <linux/device.h> |
Eric W. Biederman | 73c2799 | 2007-05-09 02:34:32 -0700 | [diff] [blame] | 59 | #include <linux/kthread.h> |
Adrian Bunk | e6fe664 | 2007-11-09 22:39:39 +0100 | [diff] [blame] | 60 | #include <linux/sched.h> |
Adrian Bunk | a1c9eea | 2008-02-06 01:36:44 -0800 | [diff] [blame] | 61 | #include <linux/signal.h> |
Akinobu Mita | 199f0ca | 2008-04-29 01:03:13 -0700 | [diff] [blame] | 62 | #include <linux/idr.h> |
Jason Wessel | 0b4b382 | 2010-05-20 21:04:29 -0500 | [diff] [blame] | 63 | #include <linux/kgdb.h> |
Steven Rostedt | 68bf21a | 2008-08-14 15:45:08 -0400 | [diff] [blame] | 64 | #include <linux/ftrace.h> |
Arjan van de Ven | 22a9d64 | 2009-01-07 08:45:46 -0800 | [diff] [blame] | 65 | #include <linux/async.h> |
Vegard Nossum | dfec072 | 2008-04-04 00:51:41 +0200 | [diff] [blame] | 66 | #include <linux/kmemcheck.h> |
Feng Tang | 6ae6996 | 2009-08-14 15:13:46 -0400 | [diff] [blame] | 67 | #include <linux/sfi.h> |
Kay Sievers | 2b2af54 | 2009-04-30 15:23:42 +0200 | [diff] [blame] | 68 | #include <linux/shmem_fs.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 69 | #include <linux/slab.h> |
Peter Zijlstra | 24a24bb | 2010-11-17 23:17:33 +0100 | [diff] [blame] | 70 | #include <linux/perf_event.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 71 | |
| 72 | #include <asm/io.h> |
| 73 | #include <asm/bugs.h> |
| 74 | #include <asm/setup.h> |
Andi Kleen | a940199 | 2005-07-28 21:15:30 -0700 | [diff] [blame] | 75 | #include <asm/sections.h> |
Arjan van de Ven | 37b73c8 | 2006-01-06 00:12:01 -0800 | [diff] [blame] | 76 | #include <asm/cacheflush.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 77 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 78 | #ifdef CONFIG_X86_LOCAL_APIC |
| 79 | #include <asm/smp.h> |
| 80 | #endif |
| 81 | |
Sam Ravnborg | aae5f66 | 2007-02-26 16:45:41 +0100 | [diff] [blame] | 82 | static int kernel_init(void *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 83 | |
| 84 | extern void init_IRQ(void); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 85 | extern void fork_init(unsigned long); |
| 86 | extern void mca_init(void); |
| 87 | extern void sbus_init(void); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 88 | extern void prio_tree_init(void); |
| 89 | extern void radix_tree_init(void); |
| 90 | extern void free_initmem(void); |
Arjan van de Ven | 37b73c8 | 2006-01-06 00:12:01 -0800 | [diff] [blame] | 91 | #ifndef CONFIG_DEBUG_RODATA |
| 92 | static inline void mark_rodata_ro(void) { } |
| 93 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 94 | |
| 95 | #ifdef CONFIG_TC |
| 96 | extern void tc_init(void); |
| 97 | #endif |
| 98 | |
Tejun Heo | 2ce802f | 2011-01-20 12:06:35 +0100 | [diff] [blame] | 99 | /* |
| 100 | * Debug helper: via this flag we know that we are in 'early bootup code' |
| 101 | * where only the boot processor is running with IRQ disabled. This means |
| 102 | * two things - IRQ must not be enabled before the flag is cleared and some |
| 103 | * operations which are not allowed with IRQ disabled are allowed while the |
| 104 | * flag is set. |
| 105 | */ |
| 106 | bool early_boot_irqs_disabled __read_mostly; |
| 107 | |
Paul E. McKenney | a682604 | 2009-02-25 18:03:42 -0800 | [diff] [blame] | 108 | enum system_states system_state __read_mostly; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 109 | EXPORT_SYMBOL(system_state); |
| 110 | |
| 111 | /* |
| 112 | * Boot command-line arguments |
| 113 | */ |
| 114 | #define MAX_INIT_ARGS CONFIG_INIT_ENV_ARG_LIMIT |
| 115 | #define MAX_INIT_ENVS CONFIG_INIT_ENV_ARG_LIMIT |
| 116 | |
| 117 | extern void time_init(void); |
| 118 | /* Default late time init is NULL. archs can override this later. */ |
Jan Beulich | d2e3192 | 2009-01-06 14:41:10 -0800 | [diff] [blame] | 119 | void (*__initdata late_time_init)(void); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 120 | extern void softirq_init(void); |
| 121 | |
Alon Bar-Lev | 30d7e0d | 2007-02-12 00:53:52 -0800 | [diff] [blame] | 122 | /* Untouched command line saved by arch-specific code. */ |
| 123 | char __initdata boot_command_line[COMMAND_LINE_SIZE]; |
| 124 | /* Untouched saved command line (eg. for /proc) */ |
| 125 | char *saved_command_line; |
| 126 | /* Command line for parameter parsing */ |
| 127 | static char *static_command_line; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 128 | |
| 129 | static char *execute_command; |
Olof Johansson | ffdfc40 | 2005-09-06 15:17:19 -0700 | [diff] [blame] | 130 | static char *ramdisk_execute_command; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 131 | |
Jan Beulich | 8b3b295 | 2007-07-15 23:41:07 -0700 | [diff] [blame] | 132 | /* |
| 133 | * If set, this is an indication to the drivers that reset the underlying |
| 134 | * device before going ahead with the initialization otherwise driver might |
| 135 | * rely on the BIOS and skip the reset operation. |
| 136 | * |
| 137 | * This is useful if kernel is booting in an unreliable environment. |
| 138 | * For ex. kdump situaiton where previous kernel has crashed, BIOS has been |
| 139 | * skipped and devices will be in unknown state. |
| 140 | */ |
| 141 | unsigned int reset_devices; |
| 142 | EXPORT_SYMBOL(reset_devices); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 143 | |
Vivek Goyal | 7e96287 | 2006-09-27 01:50:44 -0700 | [diff] [blame] | 144 | static int __init set_reset_devices(char *str) |
| 145 | { |
| 146 | reset_devices = 1; |
| 147 | return 1; |
| 148 | } |
| 149 | |
| 150 | __setup("reset_devices", set_reset_devices); |
| 151 | |
David Howells | d762746 | 2010-08-17 23:52:56 +0100 | [diff] [blame] | 152 | static const char * argv_init[MAX_INIT_ARGS+2] = { "init", NULL, }; |
| 153 | const char * envp_init[MAX_INIT_ENVS+2] = { "HOME=/", "TERM=linux", NULL, }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 154 | static const char *panic_later, *panic_param; |
| 155 | |
Rusty Russell | 914dcaa | 2010-08-11 23:04:18 -0600 | [diff] [blame] | 156 | extern const struct obs_kernel_param __setup_start[], __setup_end[]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 157 | |
| 158 | static int __init obsolete_checksetup(char *line) |
| 159 | { |
Rusty Russell | 914dcaa | 2010-08-11 23:04:18 -0600 | [diff] [blame] | 160 | const struct obs_kernel_param *p; |
Rusty Russell | 33df0d1 | 2006-09-26 10:52:32 +0200 | [diff] [blame] | 161 | int had_early_param = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 162 | |
| 163 | p = __setup_start; |
| 164 | do { |
| 165 | int n = strlen(p->str); |
| 166 | if (!strncmp(line, p->str, n)) { |
| 167 | if (p->early) { |
Rusty Russell | 33df0d1 | 2006-09-26 10:52:32 +0200 | [diff] [blame] | 168 | /* Already done in parse_early_param? |
| 169 | * (Needs exact match on param part). |
| 170 | * Keep iterating, as we can have early |
| 171 | * params and __setups of same names 8( */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 172 | if (line[n] == '\0' || line[n] == '=') |
Rusty Russell | 33df0d1 | 2006-09-26 10:52:32 +0200 | [diff] [blame] | 173 | had_early_param = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 174 | } else if (!p->setup_func) { |
| 175 | printk(KERN_WARNING "Parameter %s is obsolete," |
| 176 | " ignored\n", p->str); |
| 177 | return 1; |
| 178 | } else if (p->setup_func(line + n)) |
| 179 | return 1; |
| 180 | } |
| 181 | p++; |
| 182 | } while (p < __setup_end); |
Rusty Russell | 33df0d1 | 2006-09-26 10:52:32 +0200 | [diff] [blame] | 183 | |
| 184 | return had_early_param; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 185 | } |
| 186 | |
| 187 | /* |
| 188 | * This should be approx 2 Bo*oMips to start (note initial shift), and will |
| 189 | * still work even if initially too large, it will just take slightly longer |
| 190 | */ |
| 191 | unsigned long loops_per_jiffy = (1<<12); |
| 192 | |
| 193 | EXPORT_SYMBOL(loops_per_jiffy); |
| 194 | |
| 195 | static int __init debug_kernel(char *str) |
| 196 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 197 | console_loglevel = 10; |
Yinghai Lu | f6f21c81 | 2008-02-08 04:21:58 -0800 | [diff] [blame] | 198 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 199 | } |
| 200 | |
| 201 | static int __init quiet_kernel(char *str) |
| 202 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 203 | console_loglevel = 4; |
Yinghai Lu | f6f21c81 | 2008-02-08 04:21:58 -0800 | [diff] [blame] | 204 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 205 | } |
| 206 | |
Yinghai Lu | f6f21c81 | 2008-02-08 04:21:58 -0800 | [diff] [blame] | 207 | early_param("debug", debug_kernel); |
| 208 | early_param("quiet", quiet_kernel); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 209 | |
| 210 | static int __init loglevel(char *str) |
| 211 | { |
| 212 | get_option(&str, &console_loglevel); |
Alex Riesen | d9d4fcf | 2008-03-04 14:28:31 -0800 | [diff] [blame] | 213 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 214 | } |
| 215 | |
Yinghai Lu | f6f21c81 | 2008-02-08 04:21:58 -0800 | [diff] [blame] | 216 | early_param("loglevel", loglevel); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 217 | |
| 218 | /* |
| 219 | * Unknown boot options get handed to init, unless they look like |
Rusty Russell | f066a4f | 2009-12-01 14:56:44 +1030 | [diff] [blame] | 220 | * unused parameters (modprobe will find them in /proc/cmdline). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 221 | */ |
| 222 | static int __init unknown_bootoption(char *param, char *val) |
| 223 | { |
| 224 | /* Change NUL term back to "=", to make "param" the whole string. */ |
| 225 | if (val) { |
| 226 | /* param=val or param="val"? */ |
| 227 | if (val == param+strlen(param)+1) |
| 228 | val[-1] = '='; |
| 229 | else if (val == param+strlen(param)+2) { |
| 230 | val[-2] = '='; |
| 231 | memmove(val-1, val, strlen(val)+1); |
| 232 | val--; |
| 233 | } else |
| 234 | BUG(); |
| 235 | } |
| 236 | |
| 237 | /* Handle obsolete-style parameters */ |
| 238 | if (obsolete_checksetup(param)) |
| 239 | return 0; |
| 240 | |
Rusty Russell | f066a4f | 2009-12-01 14:56:44 +1030 | [diff] [blame] | 241 | /* Unused module parameter. */ |
| 242 | if (strchr(param, '.') && (!val || strchr(param, '.') < val)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 243 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 244 | |
| 245 | if (panic_later) |
| 246 | return 0; |
| 247 | |
| 248 | if (val) { |
| 249 | /* Environment option */ |
| 250 | unsigned int i; |
| 251 | for (i = 0; envp_init[i]; i++) { |
| 252 | if (i == MAX_INIT_ENVS) { |
| 253 | panic_later = "Too many boot env vars at `%s'"; |
| 254 | panic_param = param; |
| 255 | } |
| 256 | if (!strncmp(param, envp_init[i], val - param)) |
| 257 | break; |
| 258 | } |
| 259 | envp_init[i] = param; |
| 260 | } else { |
| 261 | /* Command line option */ |
| 262 | unsigned int i; |
| 263 | for (i = 0; argv_init[i]; i++) { |
| 264 | if (i == MAX_INIT_ARGS) { |
| 265 | panic_later = "Too many boot init vars at `%s'"; |
| 266 | panic_param = param; |
| 267 | } |
| 268 | } |
| 269 | argv_init[i] = param; |
| 270 | } |
| 271 | return 0; |
| 272 | } |
| 273 | |
Ingo Molnar | 12d6f21 | 2008-01-30 13:33:58 +0100 | [diff] [blame] | 274 | #ifdef CONFIG_DEBUG_PAGEALLOC |
| 275 | int __read_mostly debug_pagealloc_enabled = 0; |
| 276 | #endif |
| 277 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 278 | static int __init init_setup(char *str) |
| 279 | { |
| 280 | unsigned int i; |
| 281 | |
| 282 | execute_command = str; |
| 283 | /* |
| 284 | * In case LILO is going to boot us with default command line, |
| 285 | * it prepends "auto" before the whole cmdline which makes |
| 286 | * the shell think it should execute a script with such name. |
| 287 | * So we ignore all arguments entered _before_ init=... [MJ] |
| 288 | */ |
| 289 | for (i = 1; i < MAX_INIT_ARGS; i++) |
| 290 | argv_init[i] = NULL; |
| 291 | return 1; |
| 292 | } |
| 293 | __setup("init=", init_setup); |
| 294 | |
Olof Johansson | ffdfc40 | 2005-09-06 15:17:19 -0700 | [diff] [blame] | 295 | static int __init rdinit_setup(char *str) |
| 296 | { |
| 297 | unsigned int i; |
| 298 | |
| 299 | ramdisk_execute_command = str; |
| 300 | /* See "auto" comment in init_setup */ |
| 301 | for (i = 1; i < MAX_INIT_ARGS; i++) |
| 302 | argv_init[i] = NULL; |
| 303 | return 1; |
| 304 | } |
| 305 | __setup("rdinit=", rdinit_setup); |
| 306 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 307 | #ifndef CONFIG_SMP |
Amerigo Wang | 34db18a0 | 2011-03-22 16:34:06 -0700 | [diff] [blame^] | 308 | static const unsigned int setup_max_cpus = NR_CPUS; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 309 | #ifdef CONFIG_X86_LOCAL_APIC |
| 310 | static void __init smp_init(void) |
| 311 | { |
| 312 | APIC_init_uniprocessor(); |
| 313 | } |
| 314 | #else |
| 315 | #define smp_init() do { } while (0) |
| 316 | #endif |
| 317 | |
Mike Travis | e0982e9 | 2008-03-26 14:23:48 -0700 | [diff] [blame] | 318 | static inline void setup_nr_cpu_ids(void) { } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 319 | static inline void smp_prepare_cpus(unsigned int maxcpus) { } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 320 | #endif |
| 321 | |
| 322 | /* |
Alon Bar-Lev | 30d7e0d | 2007-02-12 00:53:52 -0800 | [diff] [blame] | 323 | * We need to store the untouched command line for future reference. |
| 324 | * We also need to store the touched command line since the parameter |
| 325 | * parsing is performed in place, and we should allow a component to |
| 326 | * store reference of name/value for future reference. |
| 327 | */ |
| 328 | static void __init setup_command_line(char *command_line) |
| 329 | { |
| 330 | saved_command_line = alloc_bootmem(strlen (boot_command_line)+1); |
| 331 | static_command_line = alloc_bootmem(strlen (command_line)+1); |
| 332 | strcpy (saved_command_line, boot_command_line); |
| 333 | strcpy (static_command_line, command_line); |
| 334 | } |
| 335 | |
| 336 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 337 | * We need to finalize in a non-__init function or else race conditions |
| 338 | * between the root thread and the init thread may cause start_kernel to |
| 339 | * be reaped by free_initmem before the root thread has proceeded to |
| 340 | * cpu_idle. |
| 341 | * |
| 342 | * gcc-3.4 accidentally inlines this function, so use noinline. |
| 343 | */ |
| 344 | |
Peter Zijlstra | b433c3d | 2010-06-28 16:51:01 +0200 | [diff] [blame] | 345 | static __initdata DECLARE_COMPLETION(kthreadd_done); |
| 346 | |
Rakib Mullick | f99ebf0 | 2009-01-06 14:40:38 -0800 | [diff] [blame] | 347 | static noinline void __init_refok rest_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 348 | { |
Eric W. Biederman | 73c2799 | 2007-05-09 02:34:32 -0700 | [diff] [blame] | 349 | int pid; |
| 350 | |
Paul E. McKenney | 7db905e | 2009-09-02 14:01:24 -0700 | [diff] [blame] | 351 | rcu_scheduler_starting(); |
Peter Zijlstra | b433c3d | 2010-06-28 16:51:01 +0200 | [diff] [blame] | 352 | /* |
Peter Zijlstra | 9715856 | 2010-06-30 10:37:11 +0200 | [diff] [blame] | 353 | * We need to spawn init first so that it obtains pid 1, however |
Peter Zijlstra | b433c3d | 2010-06-28 16:51:01 +0200 | [diff] [blame] | 354 | * the init task will end up wanting to create kthreads, which, if |
| 355 | * we schedule it before we create kthreadd, will OOPS. |
| 356 | */ |
Sam Ravnborg | aae5f66 | 2007-02-26 16:45:41 +0100 | [diff] [blame] | 357 | kernel_thread(kernel_init, NULL, CLONE_FS | CLONE_SIGHAND); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 358 | numa_default_policy(); |
Eric W. Biederman | 73c2799 | 2007-05-09 02:34:32 -0700 | [diff] [blame] | 359 | pid = kernel_thread(kthreadd, NULL, CLONE_FS | CLONE_FILES); |
Paul E. McKenney | d11c563 | 2010-02-22 17:04:50 -0800 | [diff] [blame] | 360 | rcu_read_lock(); |
Pavel Emelyanov | 5cd2045 | 2008-04-30 00:54:24 -0700 | [diff] [blame] | 361 | kthreadd_task = find_task_by_pid_ns(pid, &init_pid_ns); |
Paul E. McKenney | d11c563 | 2010-02-22 17:04:50 -0800 | [diff] [blame] | 362 | rcu_read_unlock(); |
Peter Zijlstra | b433c3d | 2010-06-28 16:51:01 +0200 | [diff] [blame] | 363 | complete(&kthreadd_done); |
Ingo Molnar | f340c0d | 2005-06-28 16:40:42 +0200 | [diff] [blame] | 364 | |
| 365 | /* |
| 366 | * The boot idle thread must execute schedule() |
Ingo Molnar | 1df2105 | 2007-07-09 18:51:58 +0200 | [diff] [blame] | 367 | * at least once to get things moving: |
Ingo Molnar | f340c0d | 2005-06-28 16:40:42 +0200 | [diff] [blame] | 368 | */ |
Ingo Molnar | 1df2105 | 2007-07-09 18:51:58 +0200 | [diff] [blame] | 369 | init_idle_bootup_task(current); |
Nick Piggin | 5bfb5d6 | 2005-11-08 21:39:01 -0800 | [diff] [blame] | 370 | preempt_enable_no_resched(); |
Ingo Molnar | f340c0d | 2005-06-28 16:40:42 +0200 | [diff] [blame] | 371 | schedule(); |
Nick Piggin | 5bfb5d6 | 2005-11-08 21:39:01 -0800 | [diff] [blame] | 372 | preempt_disable(); |
Ingo Molnar | f340c0d | 2005-06-28 16:40:42 +0200 | [diff] [blame] | 373 | |
Nick Piggin | 5bfb5d6 | 2005-11-08 21:39:01 -0800 | [diff] [blame] | 374 | /* Call into cpu_idle with preempt disabled */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 375 | cpu_idle(); |
Ingo Molnar | 1df2105 | 2007-07-09 18:51:58 +0200 | [diff] [blame] | 376 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 377 | |
| 378 | /* Check for early params. */ |
| 379 | static int __init do_early_param(char *param, char *val) |
| 380 | { |
Rusty Russell | 914dcaa | 2010-08-11 23:04:18 -0600 | [diff] [blame] | 381 | const struct obs_kernel_param *p; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 382 | |
| 383 | for (p = __setup_start; p < __setup_end; p++) { |
Yinghai Lu | 18a8bd9 | 2007-07-15 23:37:59 -0700 | [diff] [blame] | 384 | if ((p->early && strcmp(param, p->str) == 0) || |
| 385 | (strcmp(param, "console") == 0 && |
| 386 | strcmp(p->str, "earlycon") == 0) |
| 387 | ) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 388 | if (p->setup_func(val) != 0) |
| 389 | printk(KERN_WARNING |
| 390 | "Malformed early option '%s'\n", param); |
| 391 | } |
| 392 | } |
| 393 | /* We accept everything at this stage. */ |
| 394 | return 0; |
| 395 | } |
| 396 | |
Magnus Damm | 1397709 | 2009-03-30 14:37:25 -0700 | [diff] [blame] | 397 | void __init parse_early_options(char *cmdline) |
| 398 | { |
| 399 | parse_args("early options", cmdline, NULL, 0, do_early_param); |
| 400 | } |
| 401 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 402 | /* Arch code calls this early on, or if not, just before other parsing. */ |
| 403 | void __init parse_early_param(void) |
| 404 | { |
| 405 | static __initdata int done = 0; |
| 406 | static __initdata char tmp_cmdline[COMMAND_LINE_SIZE]; |
| 407 | |
| 408 | if (done) |
| 409 | return; |
| 410 | |
| 411 | /* All fall through to do_early_param. */ |
Alon Bar-Lev | 30d7e0d | 2007-02-12 00:53:52 -0800 | [diff] [blame] | 412 | strlcpy(tmp_cmdline, boot_command_line, COMMAND_LINE_SIZE); |
Magnus Damm | 1397709 | 2009-03-30 14:37:25 -0700 | [diff] [blame] | 413 | parse_early_options(tmp_cmdline); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 414 | done = 1; |
| 415 | } |
| 416 | |
| 417 | /* |
| 418 | * Activate the first processor. |
| 419 | */ |
| 420 | |
Stas Sergeev | 44fd229 | 2006-03-23 02:59:44 -0800 | [diff] [blame] | 421 | static void __init boot_cpu_init(void) |
| 422 | { |
| 423 | int cpu = smp_processor_id(); |
| 424 | /* Mark the boot cpu "present", "online" etc for SMP and UP case */ |
Rusty Russell | 915441b | 2009-01-01 10:12:15 +1030 | [diff] [blame] | 425 | set_cpu_online(cpu, true); |
Peter Zijlstra | 933b061 | 2009-12-16 18:04:31 +0100 | [diff] [blame] | 426 | set_cpu_active(cpu, true); |
Rusty Russell | 915441b | 2009-01-01 10:12:15 +1030 | [diff] [blame] | 427 | set_cpu_present(cpu, true); |
| 428 | set_cpu_possible(cpu, true); |
Stas Sergeev | 44fd229 | 2006-03-23 02:59:44 -0800 | [diff] [blame] | 429 | } |
| 430 | |
Benjamin Herrenschmidt | 839ad62 | 2008-04-18 16:56:18 +1000 | [diff] [blame] | 431 | void __init __weak smp_setup_processor_id(void) |
Andrew Morton | 033ab7f | 2006-06-30 01:55:50 -0700 | [diff] [blame] | 432 | { |
| 433 | } |
| 434 | |
Benjamin Herrenschmidt | 8c9843e | 2008-04-18 16:56:15 +1000 | [diff] [blame] | 435 | void __init __weak thread_info_cache_init(void) |
| 436 | { |
| 437 | } |
| 438 | |
Pekka Enberg | 444f478 | 2009-06-11 18:29:06 +0300 | [diff] [blame] | 439 | /* |
| 440 | * Set up kernel memory allocators |
| 441 | */ |
| 442 | static void __init mm_init(void) |
| 443 | { |
KAMEZAWA Hiroyuki | ca371c0 | 2009-06-12 10:33:53 +0300 | [diff] [blame] | 444 | /* |
| 445 | * page_cgroup requires countinous pages as memmap |
| 446 | * and it's bigger than MAX_ORDER unless SPARSEMEM. |
| 447 | */ |
| 448 | page_cgroup_init_flatmem(); |
Pekka Enberg | 444f478 | 2009-06-11 18:29:06 +0300 | [diff] [blame] | 449 | mem_init(); |
| 450 | kmem_cache_init(); |
Tejun Heo | 099a19d | 2010-06-27 18:50:00 +0200 | [diff] [blame] | 451 | percpu_init_late(); |
Benjamin Herrenschmidt | c868d55 | 2009-06-17 13:48:39 +1000 | [diff] [blame] | 452 | pgtable_cache_init(); |
Pekka Enberg | 444f478 | 2009-06-11 18:29:06 +0300 | [diff] [blame] | 453 | vmalloc_init(); |
| 454 | } |
| 455 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 456 | asmlinkage void __init start_kernel(void) |
| 457 | { |
| 458 | char * command_line; |
Rusty Russell | 914dcaa | 2010-08-11 23:04:18 -0600 | [diff] [blame] | 459 | extern const struct kernel_param __start___param[], __stop___param[]; |
Andrew Morton | 033ab7f | 2006-06-30 01:55:50 -0700 | [diff] [blame] | 460 | |
| 461 | smp_setup_processor_id(); |
| 462 | |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 463 | /* |
| 464 | * Need to run as early as possible, to initialize the |
| 465 | * lockdep hash: |
| 466 | */ |
| 467 | lockdep_init(); |
Thomas Gleixner | 3ac7fe5 | 2008-04-30 00:55:01 -0700 | [diff] [blame] | 468 | debug_objects_early_init(); |
Ingo Molnar | 4205942 | 2008-02-14 09:44:08 +0100 | [diff] [blame] | 469 | |
| 470 | /* |
| 471 | * Set up the the initial canary ASAP: |
| 472 | */ |
| 473 | boot_init_stack_canary(); |
| 474 | |
Paul Menage | ddbcc7e | 2007-10-18 23:39:30 -0700 | [diff] [blame] | 475 | cgroup_init_early(); |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 476 | |
| 477 | local_irq_disable(); |
Tejun Heo | 2ce802f | 2011-01-20 12:06:35 +0100 | [diff] [blame] | 478 | early_boot_irqs_disabled = true; |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 479 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 480 | /* |
| 481 | * Interrupts are still disabled. Do necessary setups, then |
| 482 | * enable them |
| 483 | */ |
Thomas Gleixner | 906568c | 2007-02-16 01:28:01 -0800 | [diff] [blame] | 484 | tick_init(); |
Stas Sergeev | 44fd229 | 2006-03-23 02:59:44 -0800 | [diff] [blame] | 485 | boot_cpu_init(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 486 | page_address_init(); |
Alex Riesen | 657cafa | 2009-05-24 15:30:48 +0200 | [diff] [blame] | 487 | printk(KERN_NOTICE "%s", linux_banner); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 488 | setup_arch(&command_line); |
Balbir Singh | cf475ad | 2008-04-29 01:00:16 -0700 | [diff] [blame] | 489 | mm_init_owner(&init_mm, &init_task); |
Alon Bar-Lev | 30d7e0d | 2007-02-12 00:53:52 -0800 | [diff] [blame] | 490 | setup_command_line(command_line); |
Mike Travis | e0982e9 | 2008-03-26 14:23:48 -0700 | [diff] [blame] | 491 | setup_nr_cpu_ids(); |
Tejun Heo | d6647bd | 2009-07-21 17:11:50 +0900 | [diff] [blame] | 492 | setup_per_cpu_areas(); |
Stas Sergeev | 44fd229 | 2006-03-23 02:59:44 -0800 | [diff] [blame] | 493 | smp_prepare_boot_cpu(); /* arch-specific boot-cpu hooks */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 494 | |
Haicheng Li | 1f52250 | 2010-05-24 14:32:51 -0700 | [diff] [blame] | 495 | build_all_zonelists(NULL); |
Pekka Enberg | 83b519e | 2009-06-10 19:40:04 +0300 | [diff] [blame] | 496 | page_alloc_init(); |
| 497 | |
| 498 | printk(KERN_NOTICE "Kernel command line: %s\n", boot_command_line); |
| 499 | parse_early_param(); |
| 500 | parse_args("Booting kernel", static_command_line, __start___param, |
| 501 | __stop___param - __start___param, |
| 502 | &unknown_bootoption); |
| 503 | /* |
| 504 | * These use large bootmem allocations and must precede |
| 505 | * kmem_cache_init() |
| 506 | */ |
| 507 | pidhash_init(); |
Pekka Enberg | 83b519e | 2009-06-10 19:40:04 +0300 | [diff] [blame] | 508 | vfs_caches_init_early(); |
| 509 | sort_main_extable(); |
| 510 | trap_init(); |
Pekka Enberg | 444f478 | 2009-06-11 18:29:06 +0300 | [diff] [blame] | 511 | mm_init(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 512 | /* |
| 513 | * Set up the scheduler prior starting any interrupts (such as the |
| 514 | * timer interrupt). Full topology setup happens at smp_init() |
| 515 | * time - but meanwhile we still have a functioning scheduler. |
| 516 | */ |
| 517 | sched_init(); |
| 518 | /* |
| 519 | * Disable preemption - early bootup scheduling is extremely |
| 520 | * fragile until we cpu_idle() for the first time. |
| 521 | */ |
| 522 | preempt_disable(); |
Ard van Breemen | c4a6830 | 2007-01-05 16:36:19 -0800 | [diff] [blame] | 523 | if (!irqs_disabled()) { |
| 524 | printk(KERN_WARNING "start_kernel(): bug: interrupts were " |
| 525 | "enabled *very* early, fixing it\n"); |
| 526 | local_irq_disable(); |
| 527 | } |
Peter Zijlstra | 9f58a20 | 2010-11-17 23:17:35 +0100 | [diff] [blame] | 528 | idr_init_cache(); |
Peter Zijlstra | 24a24bb | 2010-11-17 23:17:33 +0100 | [diff] [blame] | 529 | perf_event_init(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 530 | rcu_init(); |
Yinghai Lu | 773e3eb | 2010-02-10 01:20:33 -0800 | [diff] [blame] | 531 | radix_tree_init(); |
Yinghai Lu | 0b8f1ef | 2008-12-05 18:58:31 -0800 | [diff] [blame] | 532 | /* init some links before init_ISA_irqs() */ |
| 533 | early_irq_init(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 534 | init_IRQ(); |
Catalin Marinas | 3c7b4e6 | 2009-06-11 13:22:39 +0100 | [diff] [blame] | 535 | prio_tree_init(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 536 | init_timers(); |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 537 | hrtimers_init(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 538 | softirq_init(); |
john stultz | ad59617 | 2006-06-26 00:25:06 -0700 | [diff] [blame] | 539 | timekeeping_init(); |
john stultz | 88fecaa | 2006-07-03 00:24:04 -0700 | [diff] [blame] | 540 | time_init(); |
Heiko Carstens | 93e0281 | 2006-07-03 00:24:24 -0700 | [diff] [blame] | 541 | profile_init(); |
| 542 | if (!irqs_disabled()) |
Ron Lee | 24d431d | 2008-11-27 02:31:57 +1030 | [diff] [blame] | 543 | printk(KERN_CRIT "start_kernel(): bug: interrupts were " |
| 544 | "enabled early\n"); |
Tejun Heo | 2ce802f | 2011-01-20 12:06:35 +0100 | [diff] [blame] | 545 | early_boot_irqs_disabled = false; |
Heiko Carstens | 93e0281 | 2006-07-03 00:24:24 -0700 | [diff] [blame] | 546 | local_irq_enable(); |
Benjamin Herrenschmidt | dcce284 | 2009-06-18 13:24:12 +1000 | [diff] [blame] | 547 | |
| 548 | /* Interrupts are enabled now so all GFP allocations are safe. */ |
Rafael J. Wysocki | 452aa69 | 2010-03-05 13:42:13 -0800 | [diff] [blame] | 549 | gfp_allowed_mask = __GFP_BITS_MASK; |
Benjamin Herrenschmidt | dcce284 | 2009-06-18 13:24:12 +1000 | [diff] [blame] | 550 | |
Pekka Enberg | 7e85ee0 | 2009-06-12 14:03:06 +0300 | [diff] [blame] | 551 | kmem_cache_init_late(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 552 | |
| 553 | /* |
| 554 | * HACK ALERT! This is early. We're enabling the console before |
| 555 | * we've done PCI setups etc, and console_init() must be aware of |
| 556 | * this. But we do want output early, in case something goes wrong. |
| 557 | */ |
| 558 | console_init(); |
| 559 | if (panic_later) |
| 560 | panic(panic_later, panic_param); |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 561 | |
| 562 | lockdep_info(); |
| 563 | |
Ingo Molnar | 9a11b49a | 2006-07-03 00:24:33 -0700 | [diff] [blame] | 564 | /* |
| 565 | * Need to run this when irqs are enabled, because it wants |
| 566 | * to self-test [hard/soft]-irqs on/off lock inversion bugs |
| 567 | * too: |
| 568 | */ |
| 569 | locking_selftest(); |
| 570 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 571 | #ifdef CONFIG_BLK_DEV_INITRD |
| 572 | if (initrd_start && !initrd_below_start_ok && |
Geert Uytterhoeven | bd673c7 | 2008-07-29 22:33:36 -0700 | [diff] [blame] | 573 | page_to_pfn(virt_to_page((void *)initrd_start)) < min_low_pfn) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 574 | printk(KERN_CRIT "initrd overwritten (0x%08lx < 0x%08lx) - " |
Geert Uytterhoeven | fb6624e | 2008-07-17 21:16:36 +0200 | [diff] [blame] | 575 | "disabling it.\n", |
Geert Uytterhoeven | bd673c7 | 2008-07-29 22:33:36 -0700 | [diff] [blame] | 576 | page_to_pfn(virt_to_page((void *)initrd_start)), |
| 577 | min_low_pfn); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 578 | initrd_start = 0; |
| 579 | } |
| 580 | #endif |
KAMEZAWA Hiroyuki | 94b6da5 | 2008-10-22 14:15:05 -0700 | [diff] [blame] | 581 | page_cgroup_init(); |
Thomas Gleixner | a03c2a4 | 2008-02-09 23:24:09 +0100 | [diff] [blame] | 582 | enable_debug_pagealloc(); |
Catalin Marinas | 3c7b4e6 | 2009-06-11 13:22:39 +0100 | [diff] [blame] | 583 | kmemleak_init(); |
Thomas Gleixner | 3ac7fe5 | 2008-04-30 00:55:01 -0700 | [diff] [blame] | 584 | debug_objects_mem_init(); |
Christoph Lameter | e7c8d5c | 2005-06-21 17:14:47 -0700 | [diff] [blame] | 585 | setup_per_cpu_pageset(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 586 | numa_policy_init(); |
| 587 | if (late_time_init) |
| 588 | late_time_init(); |
Thomas Gleixner | fa84e9e | 2009-08-21 22:01:12 +0200 | [diff] [blame] | 589 | sched_clock_init(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 590 | calibrate_delay(); |
| 591 | pidmap_init(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 592 | anon_vma_init(); |
| 593 | #ifdef CONFIG_X86 |
| 594 | if (efi_enabled) |
| 595 | efi_enter_virtual_mode(); |
| 596 | #endif |
Benjamin Herrenschmidt | 8c9843e | 2008-04-18 16:56:15 +1000 | [diff] [blame] | 597 | thread_info_cache_init(); |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 598 | cred_init(); |
Jan Beulich | 4481374 | 2009-09-21 17:03:05 -0700 | [diff] [blame] | 599 | fork_init(totalram_pages); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 600 | proc_caches_init(); |
| 601 | buffer_init(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 602 | key_init(); |
| 603 | security_init(); |
Jason Wessel | 0b4b382 | 2010-05-20 21:04:29 -0500 | [diff] [blame] | 604 | dbg_late_init(); |
Jan Beulich | 4481374 | 2009-09-21 17:03:05 -0700 | [diff] [blame] | 605 | vfs_caches_init(totalram_pages); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 606 | signals_init(); |
| 607 | /* rootfs populating might need page-writeback */ |
| 608 | page_writeback_init(); |
| 609 | #ifdef CONFIG_PROC_FS |
| 610 | proc_root_init(); |
| 611 | #endif |
Paul Menage | ddbcc7e | 2007-10-18 23:39:30 -0700 | [diff] [blame] | 612 | cgroup_init(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 613 | cpuset_init(); |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 614 | taskstats_init_early(); |
Shailabh Nagar | ca74e92 | 2006-07-14 00:24:36 -0700 | [diff] [blame] | 615 | delayacct_init(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 616 | |
| 617 | check_bugs(); |
| 618 | |
| 619 | acpi_early_init(); /* before LAPIC and SMP init */ |
Feng Tang | 6ae6996 | 2009-08-14 15:13:46 -0400 | [diff] [blame] | 620 | sfi_init_late(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 621 | |
Steven Rostedt | 68bf21a | 2008-08-14 15:45:08 -0400 | [diff] [blame] | 622 | ftrace_init(); |
| 623 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 624 | /* Do the rest non-__init'ed, we're now alive */ |
| 625 | rest_init(); |
| 626 | } |
| 627 | |
Peter Oberparleiter | b99b87f | 2009-06-17 16:28:03 -0700 | [diff] [blame] | 628 | /* Call all constructor functions linked into the kernel. */ |
| 629 | static void __init do_ctors(void) |
| 630 | { |
| 631 | #ifdef CONFIG_CONSTRUCTORS |
H Hartley Sweeten | 196a15b | 2009-12-14 18:00:18 -0800 | [diff] [blame] | 632 | ctor_fn_t *fn = (ctor_fn_t *) __ctors_start; |
Peter Oberparleiter | b99b87f | 2009-06-17 16:28:03 -0700 | [diff] [blame] | 633 | |
H Hartley Sweeten | 196a15b | 2009-12-14 18:00:18 -0800 | [diff] [blame] | 634 | for (; fn < (ctor_fn_t *) __ctors_end; fn++) |
| 635 | (*fn)(); |
Peter Oberparleiter | b99b87f | 2009-06-17 16:28:03 -0700 | [diff] [blame] | 636 | #endif |
| 637 | } |
| 638 | |
Arjan van de Ven | 22a9d64 | 2009-01-07 08:45:46 -0800 | [diff] [blame] | 639 | int initcall_debug; |
Rusty Russell | d0ea3d7 | 2008-10-22 10:00:23 -0500 | [diff] [blame] | 640 | core_param(initcall_debug, initcall_debug, bool, 0644); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 641 | |
Ingo Molnar | 4a683bf | 2009-08-21 12:53:36 +0200 | [diff] [blame] | 642 | static char msgbuf[64]; |
Ingo Molnar | 4a683bf | 2009-08-21 12:53:36 +0200 | [diff] [blame] | 643 | |
Kevin Winchester | e446127 | 2010-08-09 17:20:32 -0700 | [diff] [blame] | 644 | static int __init_or_module do_one_initcall_debug(initcall_t fn) |
Linus Torvalds | e0df154 | 2008-05-15 18:14:01 -0700 | [diff] [blame] | 645 | { |
Frederic Weisbecker | 7423907 | 2008-11-11 23:24:42 +0100 | [diff] [blame] | 646 | ktime_t calltime, delta, rettime; |
Américo Wang | 30dbb20e | 2010-05-26 18:57:53 +0800 | [diff] [blame] | 647 | unsigned long long duration; |
| 648 | int ret; |
Linus Torvalds | e0df154 | 2008-05-15 18:14:01 -0700 | [diff] [blame] | 649 | |
Kevin Winchester | 22c5c03 | 2010-08-09 17:20:32 -0700 | [diff] [blame] | 650 | printk(KERN_DEBUG "calling %pF @ %i\n", fn, task_pid_nr(current)); |
| 651 | calltime = ktime_get(); |
Américo Wang | 30dbb20e | 2010-05-26 18:57:53 +0800 | [diff] [blame] | 652 | ret = fn(); |
Kevin Winchester | 22c5c03 | 2010-08-09 17:20:32 -0700 | [diff] [blame] | 653 | rettime = ktime_get(); |
| 654 | delta = ktime_sub(rettime, calltime); |
| 655 | duration = (unsigned long long) ktime_to_ns(delta) >> 10; |
| 656 | printk(KERN_DEBUG "initcall %pF returned %d after %lld usecs\n", fn, |
| 657 | ret, duration); |
Linus Torvalds | e0df154 | 2008-05-15 18:14:01 -0700 | [diff] [blame] | 658 | |
Kevin Winchester | 22c5c03 | 2010-08-09 17:20:32 -0700 | [diff] [blame] | 659 | return ret; |
| 660 | } |
| 661 | |
Kevin Winchester | e446127 | 2010-08-09 17:20:32 -0700 | [diff] [blame] | 662 | int __init_or_module do_one_initcall(initcall_t fn) |
Kevin Winchester | 22c5c03 | 2010-08-09 17:20:32 -0700 | [diff] [blame] | 663 | { |
| 664 | int count = preempt_count(); |
| 665 | int ret; |
| 666 | |
| 667 | if (initcall_debug) |
| 668 | ret = do_one_initcall_debug(fn); |
| 669 | else |
| 670 | ret = fn(); |
Linus Torvalds | e0df154 | 2008-05-15 18:14:01 -0700 | [diff] [blame] | 671 | |
| 672 | msgbuf[0] = 0; |
| 673 | |
Américo Wang | 30dbb20e | 2010-05-26 18:57:53 +0800 | [diff] [blame] | 674 | if (ret && ret != -ENODEV && initcall_debug) |
| 675 | sprintf(msgbuf, "error code %d ", ret); |
Linus Torvalds | e0df154 | 2008-05-15 18:14:01 -0700 | [diff] [blame] | 676 | |
| 677 | if (preempt_count() != count) { |
Cyrill Gorcunov | a76bfd0 | 2008-05-15 13:52:41 -0700 | [diff] [blame] | 678 | strlcat(msgbuf, "preemption imbalance ", sizeof(msgbuf)); |
Linus Torvalds | e0df154 | 2008-05-15 18:14:01 -0700 | [diff] [blame] | 679 | preempt_count() = count; |
| 680 | } |
| 681 | if (irqs_disabled()) { |
Cyrill Gorcunov | a76bfd0 | 2008-05-15 13:52:41 -0700 | [diff] [blame] | 682 | strlcat(msgbuf, "disabled interrupts ", sizeof(msgbuf)); |
Linus Torvalds | e0df154 | 2008-05-15 18:14:01 -0700 | [diff] [blame] | 683 | local_irq_enable(); |
| 684 | } |
| 685 | if (msgbuf[0]) { |
Linus Torvalds | 96d746c | 2008-10-03 13:38:07 -0700 | [diff] [blame] | 686 | printk("initcall %pF returned with %s\n", fn, msgbuf); |
Linus Torvalds | e0df154 | 2008-05-15 18:14:01 -0700 | [diff] [blame] | 687 | } |
Arjan van de Ven | 59f9415 | 2008-07-30 12:49:02 -0700 | [diff] [blame] | 688 | |
Américo Wang | 30dbb20e | 2010-05-26 18:57:53 +0800 | [diff] [blame] | 689 | return ret; |
Linus Torvalds | e0df154 | 2008-05-15 18:14:01 -0700 | [diff] [blame] | 690 | } |
| 691 | |
| 692 | |
Eduard - Gabriel Munteanu | c2147a5 | 2008-07-25 19:45:11 -0700 | [diff] [blame] | 693 | extern initcall_t __initcall_start[], __initcall_end[], __early_initcall_end[]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 694 | |
| 695 | static void __init do_initcalls(void) |
| 696 | { |
H Hartley Sweeten | 196a15b | 2009-12-14 18:00:18 -0800 | [diff] [blame] | 697 | initcall_t *fn; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 698 | |
H Hartley Sweeten | 196a15b | 2009-12-14 18:00:18 -0800 | [diff] [blame] | 699 | for (fn = __early_initcall_end; fn < __initcall_end; fn++) |
| 700 | do_one_initcall(*fn); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 701 | } |
| 702 | |
| 703 | /* |
| 704 | * Ok, the machine is now initialized. None of the devices |
| 705 | * have been touched yet, but the CPU subsystem is up and |
| 706 | * running, and memory and process management works. |
| 707 | * |
| 708 | * Now we can finally start doing some real work.. |
| 709 | */ |
| 710 | static void __init do_basic_setup(void) |
| 711 | { |
Lai Jiangshan | 759ee09 | 2009-03-25 17:06:30 +0800 | [diff] [blame] | 712 | cpuset_init_smp(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 713 | usermodehelper_init(); |
Kay Sievers | 2b2af54 | 2009-04-30 15:23:42 +0200 | [diff] [blame] | 714 | init_tmpfs(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 715 | driver_init(); |
Eric W. Biederman | b04c3af | 2007-02-14 00:33:57 -0800 | [diff] [blame] | 716 | init_irq_proc(); |
Peter Oberparleiter | b99b87f | 2009-06-17 16:28:03 -0700 | [diff] [blame] | 717 | do_ctors(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 718 | do_initcalls(); |
| 719 | } |
| 720 | |
Eduard - Gabriel Munteanu | 7babe8d | 2008-07-25 19:45:11 -0700 | [diff] [blame] | 721 | static void __init do_pre_smp_initcalls(void) |
Eduard - Gabriel Munteanu | c2147a5 | 2008-07-25 19:45:11 -0700 | [diff] [blame] | 722 | { |
H Hartley Sweeten | 196a15b | 2009-12-14 18:00:18 -0800 | [diff] [blame] | 723 | initcall_t *fn; |
Eduard - Gabriel Munteanu | c2147a5 | 2008-07-25 19:45:11 -0700 | [diff] [blame] | 724 | |
H Hartley Sweeten | 196a15b | 2009-12-14 18:00:18 -0800 | [diff] [blame] | 725 | for (fn = __initcall_start; fn < __early_initcall_end; fn++) |
| 726 | do_one_initcall(*fn); |
Eduard - Gabriel Munteanu | c2147a5 | 2008-07-25 19:45:11 -0700 | [diff] [blame] | 727 | } |
| 728 | |
David Howells | d762746 | 2010-08-17 23:52:56 +0100 | [diff] [blame] | 729 | static void run_init_process(const char *init_filename) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 730 | { |
| 731 | argv_init[0] = init_filename; |
Arnd Bergmann | 6760856 | 2006-10-02 02:18:26 -0700 | [diff] [blame] | 732 | kernel_execve(init_filename, argv_init, envp_init); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 733 | } |
| 734 | |
Vivek Goyal | ee5bfa6 | 2007-02-13 13:26:22 +0100 | [diff] [blame] | 735 | /* This is a non __init function. Force it to be noinline otherwise gcc |
| 736 | * makes it inline to init() and it becomes part of init.text section |
| 737 | */ |
Rakib Mullick | f99ebf0 | 2009-01-06 14:40:38 -0800 | [diff] [blame] | 738 | static noinline int init_post(void) |
Vivek Goyal | ee5bfa6 | 2007-02-13 13:26:22 +0100 | [diff] [blame] | 739 | { |
Arjan van de Ven | 22a9d64 | 2009-01-07 08:45:46 -0800 | [diff] [blame] | 740 | /* need to finish all async __init code before freeing the memory */ |
| 741 | async_synchronize_full(); |
Vivek Goyal | ee5bfa6 | 2007-02-13 13:26:22 +0100 | [diff] [blame] | 742 | free_initmem(); |
Vivek Goyal | ee5bfa6 | 2007-02-13 13:26:22 +0100 | [diff] [blame] | 743 | mark_rodata_ro(); |
| 744 | system_state = SYSTEM_RUNNING; |
| 745 | numa_default_policy(); |
| 746 | |
Vivek Goyal | ee5bfa6 | 2007-02-13 13:26:22 +0100 | [diff] [blame] | 747 | |
Oleg Nesterov | fae5fa4 | 2008-04-30 00:53:03 -0700 | [diff] [blame] | 748 | current->signal->flags |= SIGNAL_UNKILLABLE; |
| 749 | |
Vivek Goyal | ee5bfa6 | 2007-02-13 13:26:22 +0100 | [diff] [blame] | 750 | if (ramdisk_execute_command) { |
| 751 | run_init_process(ramdisk_execute_command); |
| 752 | printk(KERN_WARNING "Failed to execute %s\n", |
| 753 | ramdisk_execute_command); |
| 754 | } |
| 755 | |
| 756 | /* |
| 757 | * We try each of these until one succeeds. |
| 758 | * |
| 759 | * The Bourne shell can be used instead of init if we are |
| 760 | * trying to recover a really broken machine. |
| 761 | */ |
| 762 | if (execute_command) { |
| 763 | run_init_process(execute_command); |
| 764 | printk(KERN_WARNING "Failed to execute %s. Attempting " |
| 765 | "defaults...\n", execute_command); |
| 766 | } |
| 767 | run_init_process("/sbin/init"); |
| 768 | run_init_process("/etc/init"); |
| 769 | run_init_process("/bin/init"); |
| 770 | run_init_process("/bin/sh"); |
| 771 | |
Andreas Mohr | 9a85b8d | 2010-03-05 13:42:39 -0800 | [diff] [blame] | 772 | panic("No init found. Try passing init= option to kernel. " |
| 773 | "See Linux Documentation/init.txt for guidance."); |
Vivek Goyal | ee5bfa6 | 2007-02-13 13:26:22 +0100 | [diff] [blame] | 774 | } |
| 775 | |
Sam Ravnborg | aae5f66 | 2007-02-26 16:45:41 +0100 | [diff] [blame] | 776 | static int __init kernel_init(void * unused) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 777 | { |
Peter Zijlstra | b433c3d | 2010-06-28 16:51:01 +0200 | [diff] [blame] | 778 | /* |
| 779 | * Wait until kthreadd is all set-up. |
| 780 | */ |
| 781 | wait_for_completion(&kthreadd_done); |
Miao Xie | 58568d2 | 2009-06-16 15:31:49 -0700 | [diff] [blame] | 782 | /* |
| 783 | * init can allocate pages on any node |
| 784 | */ |
Miao Xie | 5ab116c | 2010-03-23 13:35:34 -0700 | [diff] [blame] | 785 | set_mems_allowed(node_states[N_HIGH_MEMORY]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 786 | /* |
| 787 | * init can run on any cpu. |
| 788 | */ |
Rusty Russell | 1a2142a | 2009-03-30 22:05:10 -0600 | [diff] [blame] | 789 | set_cpus_allowed_ptr(current, cpu_all_mask); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 790 | /* |
| 791 | * Tell the world that we're going to be the grim |
| 792 | * reaper of innocent orphaned children. |
| 793 | * |
| 794 | * We don't want people to have to make incorrect |
| 795 | * assumptions about where in the task array this |
| 796 | * can be found. |
| 797 | */ |
Sukadev Bhattiprolu | 84d7378 | 2006-12-08 02:38:01 -0800 | [diff] [blame] | 798 | init_pid_ns.child_reaper = current; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 799 | |
Cedric Le Goater | 9ec5209 | 2006-10-02 02:19:00 -0700 | [diff] [blame] | 800 | cad_pid = task_pid(current); |
| 801 | |
Andi Kleen | ca74a6f | 2008-01-30 13:33:17 +0100 | [diff] [blame] | 802 | smp_prepare_cpus(setup_max_cpus); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 803 | |
| 804 | do_pre_smp_initcalls(); |
Peter Zijlstra | 004417a | 2010-11-25 18:38:29 +0100 | [diff] [blame] | 805 | lockup_detector_init(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 806 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 807 | smp_init(); |
| 808 | sched_init_smp(); |
| 809 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 810 | do_basic_setup(); |
| 811 | |
Eric W. Biederman | 2bd3a997 | 2010-03-02 23:53:19 -0800 | [diff] [blame] | 812 | /* Open the /dev/console on the rootfs, this should never fail */ |
| 813 | if (sys_open((const char __user *) "/dev/console", O_RDWR, 0) < 0) |
| 814 | printk(KERN_WARNING "Warning: unable to open an initial console.\n"); |
| 815 | |
| 816 | (void) sys_dup(0); |
| 817 | (void) sys_dup(0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 818 | /* |
| 819 | * check if there is an early userspace init. If yes, let it do all |
| 820 | * the work |
| 821 | */ |
Olof Johansson | ffdfc40 | 2005-09-06 15:17:19 -0700 | [diff] [blame] | 822 | |
| 823 | if (!ramdisk_execute_command) |
| 824 | ramdisk_execute_command = "/init"; |
| 825 | |
| 826 | if (sys_access((const char __user *) ramdisk_execute_command, 0) != 0) { |
| 827 | ramdisk_execute_command = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 828 | prepare_namespace(); |
Olof Johansson | ffdfc40 | 2005-09-06 15:17:19 -0700 | [diff] [blame] | 829 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 830 | |
| 831 | /* |
| 832 | * Ok, we have completed the initial bootup, and |
| 833 | * we're essentially up and running. Get rid of the |
| 834 | * initmem segments and start the user-mode stuff.. |
| 835 | */ |
Frederic Weisbecker | 71566a0 | 2008-10-31 12:57:20 +0100 | [diff] [blame] | 836 | |
Vivek Goyal | ee5bfa6 | 2007-02-13 13:26:22 +0100 | [diff] [blame] | 837 | init_post(); |
| 838 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 839 | } |