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 |
Fabian Frederick | dd4d9fe | 2014-08-08 14:23:44 -0700 | [diff] [blame] | 9 | * Simplified starting of init: Michael A. Griffith <grif@acm.org> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 10 | */ |
| 11 | |
Andrew Morton | ea676e8 | 2013-04-29 16:18:20 -0700 | [diff] [blame] | 12 | #define DEBUG /* Enable initcall_debug */ |
| 13 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 14 | #include <linux/types.h> |
| 15 | #include <linux/module.h> |
| 16 | #include <linux/proc_fs.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | #include <linux/kernel.h> |
| 18 | #include <linux/syscalls.h> |
Ingo Molnar | 9b5609f | 2008-02-14 09:41:09 +0100 | [diff] [blame] | 19 | #include <linux/stackprotector.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | #include <linux/string.h> |
| 21 | #include <linux/ctype.h> |
| 22 | #include <linux/delay.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | #include <linux/ioport.h> |
| 24 | #include <linux/init.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | #include <linux/initrd.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | #include <linux/bootmem.h> |
Len Brown | 4a7a16d | 2009-06-12 20:42:08 -0400 | [diff] [blame] | 27 | #include <linux/acpi.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | #include <linux/tty.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | #include <linux/percpu.h> |
| 30 | #include <linux/kmod.h> |
Nick Piggin | db64fe0 | 2008-10-18 20:27:03 -0700 | [diff] [blame] | 31 | #include <linux/vmalloc.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | #include <linux/kernel_stat.h> |
Rusty Russell | d7cd561 | 2006-12-07 02:14:08 +0100 | [diff] [blame] | 33 | #include <linux/start_kernel.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | #include <linux/security.h> |
Jens Axboe | 3d44223 | 2008-06-26 11:21:34 +0200 | [diff] [blame] | 35 | #include <linux/smp.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |
Joonsoo Kim | eefa864b | 2014-12-12 16:55:46 -0800 | [diff] [blame] | 54 | #include <linux/page_ext.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> |
Feng Tang | 6ae6996 | 2009-08-14 15:13:46 -0400 | [diff] [blame] | 69 | #include <linux/sfi.h> |
Kay Sievers | 2b2af54 | 2009-04-30 15:23:42 +0200 | [diff] [blame] | 70 | #include <linux/shmem_fs.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 71 | #include <linux/slab.h> |
Peter Zijlstra | 24a24bb | 2010-11-17 23:17:33 +0100 | [diff] [blame] | 72 | #include <linux/perf_event.h> |
Al Viro | 4a9d4b0 | 2012-06-24 09:56:45 +0400 | [diff] [blame] | 73 | #include <linux/file.h> |
Al Viro | a74fb73 | 2012-10-10 21:28:25 -0400 | [diff] [blame] | 74 | #include <linux/ptrace.h> |
Tejun Heo | bb813f4 | 2013-01-18 14:05:56 -0800 | [diff] [blame] | 75 | #include <linux/blkdev.h> |
| 76 | #include <linux/elevator.h> |
Stephen Boyd | 38ff87f | 2013-06-01 23:39:40 -0700 | [diff] [blame] | 77 | #include <linux/sched_clock.h> |
Frederic Weisbecker | 65f382f | 2013-07-11 19:12:32 +0200 | [diff] [blame] | 78 | #include <linux/context_tracking.h> |
Theodore Ts'o | 47d06e5 | 2013-09-10 10:52:35 -0400 | [diff] [blame] | 79 | #include <linux/random.h> |
Prarit Bhargava | 7b0b73d | 2014-06-04 16:12:17 -0700 | [diff] [blame] | 80 | #include <linux/list.h> |
Dmitry Kasatkin | c9cd2ce | 2014-11-05 17:01:15 +0200 | [diff] [blame] | 81 | #include <linux/integrity.h> |
Al Viro | e149ed2 | 2014-11-01 10:57:28 -0400 | [diff] [blame] | 82 | #include <linux/proc_ns.h> |
Toshi Kani | 0ddab1d | 2015-04-14 15:47:20 -0700 | [diff] [blame] | 83 | #include <linux/io.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 84 | |
| 85 | #include <asm/io.h> |
| 86 | #include <asm/bugs.h> |
| 87 | #include <asm/setup.h> |
Andi Kleen | a940199 | 2005-07-28 21:15:30 -0700 | [diff] [blame] | 88 | #include <asm/sections.h> |
Arjan van de Ven | 37b73c8 | 2006-01-06 00:12:01 -0800 | [diff] [blame] | 89 | #include <asm/cacheflush.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 90 | |
Sam Ravnborg | aae5f66 | 2007-02-26 16:45:41 +0100 | [diff] [blame] | 91 | static int kernel_init(void *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 92 | |
| 93 | extern void init_IRQ(void); |
Heinrich Schuchardt | ff691f6 | 2015-04-16 12:47:44 -0700 | [diff] [blame] | 94 | extern void fork_init(void); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 95 | extern void radix_tree_init(void); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 96 | |
Tejun Heo | 2ce802f | 2011-01-20 12:06:35 +0100 | [diff] [blame] | 97 | /* |
| 98 | * Debug helper: via this flag we know that we are in 'early bootup code' |
| 99 | * where only the boot processor is running with IRQ disabled. This means |
| 100 | * two things - IRQ must not be enabled before the flag is cleared and some |
| 101 | * operations which are not allowed with IRQ disabled are allowed while the |
| 102 | * flag is set. |
| 103 | */ |
| 104 | bool early_boot_irqs_disabled __read_mostly; |
| 105 | |
Paul E. McKenney | a682604 | 2009-02-25 18:03:42 -0800 | [diff] [blame] | 106 | enum system_states system_state __read_mostly; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 107 | EXPORT_SYMBOL(system_state); |
| 108 | |
| 109 | /* |
| 110 | * Boot command-line arguments |
| 111 | */ |
| 112 | #define MAX_INIT_ARGS CONFIG_INIT_ENV_ARG_LIMIT |
| 113 | #define MAX_INIT_ENVS CONFIG_INIT_ENV_ARG_LIMIT |
| 114 | |
| 115 | extern void time_init(void); |
| 116 | /* Default late time init is NULL. archs can override this later. */ |
Jan Beulich | d2e3192 | 2009-01-06 14:41:10 -0800 | [diff] [blame] | 117 | void (*__initdata late_time_init)(void); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 118 | |
Alon Bar-Lev | 30d7e0d | 2007-02-12 00:53:52 -0800 | [diff] [blame] | 119 | /* Untouched command line saved by arch-specific code. */ |
| 120 | char __initdata boot_command_line[COMMAND_LINE_SIZE]; |
| 121 | /* Untouched saved command line (eg. for /proc) */ |
| 122 | char *saved_command_line; |
| 123 | /* Command line for parameter parsing */ |
| 124 | static char *static_command_line; |
Krzysztof Mazur | 08746a6 | 2013-10-31 13:45:39 +1030 | [diff] [blame] | 125 | /* Command line for per-initcall parameter parsing */ |
| 126 | static char *initcall_command_line; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 127 | |
| 128 | static char *execute_command; |
Olof Johansson | ffdfc40 | 2005-09-06 15:17:19 -0700 | [diff] [blame] | 129 | static char *ramdisk_execute_command; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 130 | |
Jan Beulich | 8b3b295 | 2007-07-15 23:41:07 -0700 | [diff] [blame] | 131 | /* |
Hannes Frederic Sowa | c4b2c0c | 2013-10-19 21:48:53 +0200 | [diff] [blame] | 132 | * Used to generate warnings if static_key manipulation functions are used |
| 133 | * before jump_label_init is called. |
| 134 | */ |
Fabian Frederick | dd4d9fe | 2014-08-08 14:23:44 -0700 | [diff] [blame] | 135 | bool static_key_initialized __read_mostly; |
Hannes Frederic Sowa | c4b2c0c | 2013-10-19 21:48:53 +0200 | [diff] [blame] | 136 | EXPORT_SYMBOL_GPL(static_key_initialized); |
| 137 | |
| 138 | /* |
Jan Beulich | 8b3b295 | 2007-07-15 23:41:07 -0700 | [diff] [blame] | 139 | * If set, this is an indication to the drivers that reset the underlying |
| 140 | * device before going ahead with the initialization otherwise driver might |
| 141 | * rely on the BIOS and skip the reset operation. |
| 142 | * |
| 143 | * This is useful if kernel is booting in an unreliable environment. |
Frans Klaver | fc454fd | 2015-02-23 22:05:56 +0100 | [diff] [blame] | 144 | * For ex. kdump situation where previous kernel has crashed, BIOS has been |
Jan Beulich | 8b3b295 | 2007-07-15 23:41:07 -0700 | [diff] [blame] | 145 | * skipped and devices will be in unknown state. |
| 146 | */ |
| 147 | unsigned int reset_devices; |
| 148 | EXPORT_SYMBOL(reset_devices); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 149 | |
Vivek Goyal | 7e96287 | 2006-09-27 01:50:44 -0700 | [diff] [blame] | 150 | static int __init set_reset_devices(char *str) |
| 151 | { |
| 152 | reset_devices = 1; |
| 153 | return 1; |
| 154 | } |
| 155 | |
| 156 | __setup("reset_devices", set_reset_devices); |
| 157 | |
Fabian Frederick | dd4d9fe | 2014-08-08 14:23:44 -0700 | [diff] [blame] | 158 | static const char *argv_init[MAX_INIT_ARGS+2] = { "init", NULL, }; |
| 159 | const char *envp_init[MAX_INIT_ENVS+2] = { "HOME=/", "TERM=linux", NULL, }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 160 | static const char *panic_later, *panic_param; |
| 161 | |
Rusty Russell | 914dcaa | 2010-08-11 23:04:18 -0600 | [diff] [blame] | 162 | extern const struct obs_kernel_param __setup_start[], __setup_end[]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 163 | |
Yaowei Bai | 31c025b | 2016-01-20 14:59:27 -0800 | [diff] [blame] | 164 | static bool __init obsolete_checksetup(char *line) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 165 | { |
Rusty Russell | 914dcaa | 2010-08-11 23:04:18 -0600 | [diff] [blame] | 166 | const struct obs_kernel_param *p; |
Yaowei Bai | 31c025b | 2016-01-20 14:59:27 -0800 | [diff] [blame] | 167 | bool had_early_param = false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 168 | |
| 169 | p = __setup_start; |
| 170 | do { |
| 171 | int n = strlen(p->str); |
Michal Schmidt | b1e4d20 | 2011-10-10 00:03:37 +0200 | [diff] [blame] | 172 | if (parameqn(line, p->str, n)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 173 | if (p->early) { |
Rusty Russell | 33df0d1 | 2006-09-26 10:52:32 +0200 | [diff] [blame] | 174 | /* Already done in parse_early_param? |
| 175 | * (Needs exact match on param part). |
| 176 | * Keep iterating, as we can have early |
| 177 | * params and __setups of same names 8( */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 178 | if (line[n] == '\0' || line[n] == '=') |
Yaowei Bai | 31c025b | 2016-01-20 14:59:27 -0800 | [diff] [blame] | 179 | had_early_param = true; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 180 | } else if (!p->setup_func) { |
Andrew Morton | ea676e8 | 2013-04-29 16:18:20 -0700 | [diff] [blame] | 181 | pr_warn("Parameter %s is obsolete, ignored\n", |
| 182 | p->str); |
Yaowei Bai | 31c025b | 2016-01-20 14:59:27 -0800 | [diff] [blame] | 183 | return true; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 184 | } else if (p->setup_func(line + n)) |
Yaowei Bai | 31c025b | 2016-01-20 14:59:27 -0800 | [diff] [blame] | 185 | return true; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 186 | } |
| 187 | p++; |
| 188 | } while (p < __setup_end); |
Rusty Russell | 33df0d1 | 2006-09-26 10:52:32 +0200 | [diff] [blame] | 189 | |
| 190 | return had_early_param; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 191 | } |
| 192 | |
| 193 | /* |
| 194 | * This should be approx 2 Bo*oMips to start (note initial shift), and will |
| 195 | * still work even if initially too large, it will just take slightly longer |
| 196 | */ |
| 197 | unsigned long loops_per_jiffy = (1<<12); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 198 | EXPORT_SYMBOL(loops_per_jiffy); |
| 199 | |
| 200 | static int __init debug_kernel(char *str) |
| 201 | { |
Borislav Petkov | a8fe19e | 2014-06-04 16:11:46 -0700 | [diff] [blame] | 202 | console_loglevel = CONSOLE_LOGLEVEL_DEBUG; |
Yinghai Lu | f6f21c81 | 2008-02-08 04:21:58 -0800 | [diff] [blame] | 203 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 204 | } |
| 205 | |
| 206 | static int __init quiet_kernel(char *str) |
| 207 | { |
Borislav Petkov | a8fe19e | 2014-06-04 16:11:46 -0700 | [diff] [blame] | 208 | console_loglevel = CONSOLE_LOGLEVEL_QUIET; |
Yinghai Lu | f6f21c81 | 2008-02-08 04:21:58 -0800 | [diff] [blame] | 209 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 210 | } |
| 211 | |
Yinghai Lu | f6f21c81 | 2008-02-08 04:21:58 -0800 | [diff] [blame] | 212 | early_param("debug", debug_kernel); |
| 213 | early_param("quiet", quiet_kernel); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 214 | |
| 215 | static int __init loglevel(char *str) |
| 216 | { |
Alexander Sverdlin | 808bf29 | 2011-09-21 09:51:40 +0200 | [diff] [blame] | 217 | int newlevel; |
| 218 | |
| 219 | /* |
| 220 | * Only update loglevel value when a correct setting was passed, |
| 221 | * to prevent blind crashes (when loglevel being set to 0) that |
| 222 | * are quite hard to debug |
| 223 | */ |
| 224 | if (get_option(&str, &newlevel)) { |
| 225 | console_loglevel = newlevel; |
| 226 | return 0; |
| 227 | } |
| 228 | |
| 229 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 230 | } |
| 231 | |
Yinghai Lu | f6f21c81 | 2008-02-08 04:21:58 -0800 | [diff] [blame] | 232 | early_param("loglevel", loglevel); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 233 | |
Chris Metcalf | a99cd11 | 2012-04-06 12:53:50 -0400 | [diff] [blame] | 234 | /* Change NUL term back to "=", to make "param" the whole string. */ |
Luis R. Rodriguez | ecc8617 | 2015-03-30 16:20:03 -0700 | [diff] [blame] | 235 | static int __init repair_env_string(char *param, char *val, |
| 236 | const char *unused, void *arg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 237 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 238 | if (val) { |
| 239 | /* param=val or param="val"? */ |
| 240 | if (val == param+strlen(param)+1) |
| 241 | val[-1] = '='; |
| 242 | else if (val == param+strlen(param)+2) { |
| 243 | val[-2] = '='; |
| 244 | memmove(val-1, val, strlen(val)+1); |
| 245 | val--; |
| 246 | } else |
| 247 | BUG(); |
| 248 | } |
Chris Metcalf | a99cd11 | 2012-04-06 12:53:50 -0400 | [diff] [blame] | 249 | return 0; |
| 250 | } |
| 251 | |
Rusty Russell | 51e158c | 2014-04-28 11:34:33 +0930 | [diff] [blame] | 252 | /* Anything after -- gets handed straight to init. */ |
Luis R. Rodriguez | ecc8617 | 2015-03-30 16:20:03 -0700 | [diff] [blame] | 253 | static int __init set_init_arg(char *param, char *val, |
| 254 | const char *unused, void *arg) |
Rusty Russell | 51e158c | 2014-04-28 11:34:33 +0930 | [diff] [blame] | 255 | { |
| 256 | unsigned int i; |
| 257 | |
| 258 | if (panic_later) |
| 259 | return 0; |
| 260 | |
Luis R. Rodriguez | ecc8617 | 2015-03-30 16:20:03 -0700 | [diff] [blame] | 261 | repair_env_string(param, val, unused, NULL); |
Rusty Russell | 51e158c | 2014-04-28 11:34:33 +0930 | [diff] [blame] | 262 | |
| 263 | for (i = 0; argv_init[i]; i++) { |
| 264 | if (i == MAX_INIT_ARGS) { |
| 265 | panic_later = "init"; |
| 266 | panic_param = param; |
| 267 | return 0; |
| 268 | } |
| 269 | } |
| 270 | argv_init[i] = param; |
| 271 | return 0; |
| 272 | } |
| 273 | |
Chris Metcalf | a99cd11 | 2012-04-06 12:53:50 -0400 | [diff] [blame] | 274 | /* |
| 275 | * Unknown boot options get handed to init, unless they look like |
| 276 | * unused parameters (modprobe will find them in /proc/cmdline). |
| 277 | */ |
Luis R. Rodriguez | ecc8617 | 2015-03-30 16:20:03 -0700 | [diff] [blame] | 278 | static int __init unknown_bootoption(char *param, char *val, |
| 279 | const char *unused, void *arg) |
Chris Metcalf | a99cd11 | 2012-04-06 12:53:50 -0400 | [diff] [blame] | 280 | { |
Luis R. Rodriguez | ecc8617 | 2015-03-30 16:20:03 -0700 | [diff] [blame] | 281 | repair_env_string(param, val, unused, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 282 | |
| 283 | /* Handle obsolete-style parameters */ |
| 284 | if (obsolete_checksetup(param)) |
| 285 | return 0; |
| 286 | |
Rusty Russell | f066a4f | 2009-12-01 14:56:44 +1030 | [diff] [blame] | 287 | /* Unused module parameter. */ |
| 288 | if (strchr(param, '.') && (!val || strchr(param, '.') < val)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 289 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 290 | |
| 291 | if (panic_later) |
| 292 | return 0; |
| 293 | |
| 294 | if (val) { |
| 295 | /* Environment option */ |
| 296 | unsigned int i; |
| 297 | for (i = 0; envp_init[i]; i++) { |
| 298 | if (i == MAX_INIT_ENVS) { |
Tetsuo Handa | 499a458 | 2014-01-23 15:54:56 -0800 | [diff] [blame] | 299 | panic_later = "env"; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 300 | panic_param = param; |
| 301 | } |
| 302 | if (!strncmp(param, envp_init[i], val - param)) |
| 303 | break; |
| 304 | } |
| 305 | envp_init[i] = param; |
| 306 | } else { |
| 307 | /* Command line option */ |
| 308 | unsigned int i; |
| 309 | for (i = 0; argv_init[i]; i++) { |
| 310 | if (i == MAX_INIT_ARGS) { |
Tetsuo Handa | 499a458 | 2014-01-23 15:54:56 -0800 | [diff] [blame] | 311 | panic_later = "init"; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 312 | panic_param = param; |
| 313 | } |
| 314 | } |
| 315 | argv_init[i] = param; |
| 316 | } |
| 317 | return 0; |
| 318 | } |
| 319 | |
| 320 | static int __init init_setup(char *str) |
| 321 | { |
| 322 | unsigned int i; |
| 323 | |
| 324 | execute_command = str; |
| 325 | /* |
| 326 | * In case LILO is going to boot us with default command line, |
| 327 | * it prepends "auto" before the whole cmdline which makes |
| 328 | * the shell think it should execute a script with such name. |
| 329 | * So we ignore all arguments entered _before_ init=... [MJ] |
| 330 | */ |
| 331 | for (i = 1; i < MAX_INIT_ARGS; i++) |
| 332 | argv_init[i] = NULL; |
| 333 | return 1; |
| 334 | } |
| 335 | __setup("init=", init_setup); |
| 336 | |
Olof Johansson | ffdfc40 | 2005-09-06 15:17:19 -0700 | [diff] [blame] | 337 | static int __init rdinit_setup(char *str) |
| 338 | { |
| 339 | unsigned int i; |
| 340 | |
| 341 | ramdisk_execute_command = str; |
| 342 | /* See "auto" comment in init_setup */ |
| 343 | for (i = 1; i < MAX_INIT_ARGS; i++) |
| 344 | argv_init[i] = NULL; |
| 345 | return 1; |
| 346 | } |
| 347 | __setup("rdinit=", rdinit_setup); |
| 348 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 349 | #ifndef CONFIG_SMP |
Amerigo Wang | 34db18a0 | 2011-03-22 16:34:06 -0700 | [diff] [blame] | 350 | static const unsigned int setup_max_cpus = NR_CPUS; |
Mike Travis | e0982e9 | 2008-03-26 14:23:48 -0700 | [diff] [blame] | 351 | static inline void setup_nr_cpu_ids(void) { } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 352 | static inline void smp_prepare_cpus(unsigned int maxcpus) { } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 353 | #endif |
| 354 | |
| 355 | /* |
Alon Bar-Lev | 30d7e0d | 2007-02-12 00:53:52 -0800 | [diff] [blame] | 356 | * We need to store the untouched command line for future reference. |
| 357 | * We also need to store the touched command line since the parameter |
| 358 | * parsing is performed in place, and we should allow a component to |
| 359 | * store reference of name/value for future reference. |
| 360 | */ |
| 361 | static void __init setup_command_line(char *command_line) |
| 362 | { |
Santosh Shilimkar | 098b081 | 2014-01-21 15:50:21 -0800 | [diff] [blame] | 363 | saved_command_line = |
| 364 | memblock_virt_alloc(strlen(boot_command_line) + 1, 0); |
| 365 | initcall_command_line = |
| 366 | memblock_virt_alloc(strlen(boot_command_line) + 1, 0); |
| 367 | static_command_line = memblock_virt_alloc(strlen(command_line) + 1, 0); |
Fabian Frederick | dd4d9fe | 2014-08-08 14:23:44 -0700 | [diff] [blame] | 368 | strcpy(saved_command_line, boot_command_line); |
| 369 | strcpy(static_command_line, command_line); |
Alon Bar-Lev | 30d7e0d | 2007-02-12 00:53:52 -0800 | [diff] [blame] | 370 | } |
| 371 | |
| 372 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 373 | * We need to finalize in a non-__init function or else race conditions |
| 374 | * between the root thread and the init thread may cause start_kernel to |
| 375 | * be reaped by free_initmem before the root thread has proceeded to |
| 376 | * cpu_idle. |
| 377 | * |
| 378 | * gcc-3.4 accidentally inlines this function, so use noinline. |
| 379 | */ |
| 380 | |
Peter Zijlstra | b433c3d | 2010-06-28 16:51:01 +0200 | [diff] [blame] | 381 | static __initdata DECLARE_COMPLETION(kthreadd_done); |
| 382 | |
Fabian Frederick | bd721ea | 2016-08-02 14:03:33 -0700 | [diff] [blame] | 383 | static noinline void __ref rest_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 384 | { |
Eric W. Biederman | 73c2799 | 2007-05-09 02:34:32 -0700 | [diff] [blame] | 385 | int pid; |
| 386 | |
Paul E. McKenney | 7db905e | 2009-09-02 14:01:24 -0700 | [diff] [blame] | 387 | rcu_scheduler_starting(); |
Peter Zijlstra | b433c3d | 2010-06-28 16:51:01 +0200 | [diff] [blame] | 388 | /* |
Peter Zijlstra | 9715856 | 2010-06-30 10:37:11 +0200 | [diff] [blame] | 389 | * 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] | 390 | * the init task will end up wanting to create kthreads, which, if |
| 391 | * we schedule it before we create kthreadd, will OOPS. |
| 392 | */ |
Oleg Nesterov | 34a1b72 | 2014-06-04 16:12:19 -0700 | [diff] [blame] | 393 | kernel_thread(kernel_init, NULL, CLONE_FS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 394 | numa_default_policy(); |
Eric W. Biederman | 73c2799 | 2007-05-09 02:34:32 -0700 | [diff] [blame] | 395 | pid = kernel_thread(kthreadd, NULL, CLONE_FS | CLONE_FILES); |
Paul E. McKenney | d11c563 | 2010-02-22 17:04:50 -0800 | [diff] [blame] | 396 | rcu_read_lock(); |
Pavel Emelyanov | 5cd2045 | 2008-04-30 00:54:24 -0700 | [diff] [blame] | 397 | kthreadd_task = find_task_by_pid_ns(pid, &init_pid_ns); |
Paul E. McKenney | d11c563 | 2010-02-22 17:04:50 -0800 | [diff] [blame] | 398 | rcu_read_unlock(); |
Peter Zijlstra | b433c3d | 2010-06-28 16:51:01 +0200 | [diff] [blame] | 399 | complete(&kthreadd_done); |
Ingo Molnar | f340c0d | 2005-06-28 16:40:42 +0200 | [diff] [blame] | 400 | |
| 401 | /* |
| 402 | * The boot idle thread must execute schedule() |
Ingo Molnar | 1df2105 | 2007-07-09 18:51:58 +0200 | [diff] [blame] | 403 | * at least once to get things moving: |
Ingo Molnar | f340c0d | 2005-06-28 16:40:42 +0200 | [diff] [blame] | 404 | */ |
Ingo Molnar | 1df2105 | 2007-07-09 18:51:58 +0200 | [diff] [blame] | 405 | init_idle_bootup_task(current); |
Thomas Gleixner | bd2f553 | 2011-03-21 12:33:18 +0100 | [diff] [blame] | 406 | schedule_preempt_disabled(); |
Nick Piggin | 5bfb5d6 | 2005-11-08 21:39:01 -0800 | [diff] [blame] | 407 | /* Call into cpu_idle with preempt disabled */ |
Thomas Gleixner | a1a04ec | 2013-03-21 22:49:34 +0100 | [diff] [blame] | 408 | cpu_startup_entry(CPUHP_ONLINE); |
Ingo Molnar | 1df2105 | 2007-07-09 18:51:58 +0200 | [diff] [blame] | 409 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 410 | |
| 411 | /* Check for early params. */ |
Luis R. Rodriguez | ecc8617 | 2015-03-30 16:20:03 -0700 | [diff] [blame] | 412 | static int __init do_early_param(char *param, char *val, |
| 413 | const char *unused, void *arg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 414 | { |
Rusty Russell | 914dcaa | 2010-08-11 23:04:18 -0600 | [diff] [blame] | 415 | const struct obs_kernel_param *p; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 416 | |
| 417 | for (p = __setup_start; p < __setup_end; p++) { |
Michal Schmidt | b1e4d20 | 2011-10-10 00:03:37 +0200 | [diff] [blame] | 418 | if ((p->early && parameq(param, p->str)) || |
Yinghai Lu | 18a8bd9 | 2007-07-15 23:37:59 -0700 | [diff] [blame] | 419 | (strcmp(param, "console") == 0 && |
| 420 | strcmp(p->str, "earlycon") == 0) |
| 421 | ) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 422 | if (p->setup_func(val) != 0) |
Andrew Morton | ea676e8 | 2013-04-29 16:18:20 -0700 | [diff] [blame] | 423 | pr_warn("Malformed early option '%s'\n", param); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 424 | } |
| 425 | } |
| 426 | /* We accept everything at this stage. */ |
| 427 | return 0; |
| 428 | } |
| 429 | |
Magnus Damm | 1397709 | 2009-03-30 14:37:25 -0700 | [diff] [blame] | 430 | void __init parse_early_options(char *cmdline) |
| 431 | { |
Luis R. Rodriguez | ecc8617 | 2015-03-30 16:20:03 -0700 | [diff] [blame] | 432 | parse_args("early options", cmdline, NULL, 0, 0, 0, NULL, |
| 433 | do_early_param); |
Magnus Damm | 1397709 | 2009-03-30 14:37:25 -0700 | [diff] [blame] | 434 | } |
| 435 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 436 | /* Arch code calls this early on, or if not, just before other parsing. */ |
| 437 | void __init parse_early_param(void) |
| 438 | { |
Fabian Frederick | dd4d9fe | 2014-08-08 14:23:44 -0700 | [diff] [blame] | 439 | static int done __initdata; |
| 440 | static char tmp_cmdline[COMMAND_LINE_SIZE] __initdata; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 441 | |
| 442 | if (done) |
| 443 | return; |
| 444 | |
| 445 | /* All fall through to do_early_param. */ |
Alon Bar-Lev | 30d7e0d | 2007-02-12 00:53:52 -0800 | [diff] [blame] | 446 | strlcpy(tmp_cmdline, boot_command_line, COMMAND_LINE_SIZE); |
Magnus Damm | 1397709 | 2009-03-30 14:37:25 -0700 | [diff] [blame] | 447 | parse_early_options(tmp_cmdline); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 448 | done = 1; |
| 449 | } |
| 450 | |
Thomas Gleixner | e7ff3a4 | 2016-12-09 19:29:10 +0100 | [diff] [blame^] | 451 | void __init __weak arch_post_acpi_subsys_init(void) { } |
| 452 | |
Benjamin Herrenschmidt | 839ad62 | 2008-04-18 16:56:18 +1000 | [diff] [blame] | 453 | void __init __weak smp_setup_processor_id(void) |
Andrew Morton | 033ab7f | 2006-06-30 01:55:50 -0700 | [diff] [blame] | 454 | { |
| 455 | } |
| 456 | |
David Howells | eded09c | 2012-11-02 13:20:42 +0000 | [diff] [blame] | 457 | # if THREAD_SIZE >= PAGE_SIZE |
Linus Torvalds | b235bee | 2016-06-24 15:09:37 -0700 | [diff] [blame] | 458 | void __init __weak thread_stack_cache_init(void) |
Benjamin Herrenschmidt | 8c9843e | 2008-04-18 16:56:15 +1000 | [diff] [blame] | 459 | { |
| 460 | } |
David Howells | eded09c | 2012-11-02 13:20:42 +0000 | [diff] [blame] | 461 | #endif |
Benjamin Herrenschmidt | 8c9843e | 2008-04-18 16:56:15 +1000 | [diff] [blame] | 462 | |
Pekka Enberg | 444f478 | 2009-06-11 18:29:06 +0300 | [diff] [blame] | 463 | /* |
| 464 | * Set up kernel memory allocators |
| 465 | */ |
| 466 | static void __init mm_init(void) |
| 467 | { |
Joonsoo Kim | eefa864b | 2014-12-12 16:55:46 -0800 | [diff] [blame] | 468 | /* |
| 469 | * page_ext requires contiguous pages, |
| 470 | * bigger than MAX_ORDER unless SPARSEMEM. |
| 471 | */ |
| 472 | page_ext_init_flatmem(); |
Pekka Enberg | 444f478 | 2009-06-11 18:29:06 +0300 | [diff] [blame] | 473 | mem_init(); |
| 474 | kmem_cache_init(); |
Tejun Heo | 099a19d | 2010-06-27 18:50:00 +0200 | [diff] [blame] | 475 | percpu_init_late(); |
Kirill A. Shutemov | b35f181 | 2014-01-21 15:49:07 -0800 | [diff] [blame] | 476 | pgtable_init(); |
Pekka Enberg | 444f478 | 2009-06-11 18:29:06 +0300 | [diff] [blame] | 477 | vmalloc_init(); |
Toshi Kani | 0ddab1d | 2015-04-14 15:47:20 -0700 | [diff] [blame] | 478 | ioremap_huge_init(); |
Pekka Enberg | 444f478 | 2009-06-11 18:29:06 +0300 | [diff] [blame] | 479 | } |
| 480 | |
Andi Kleen | 722a9f9 | 2014-05-02 00:44:38 +0200 | [diff] [blame] | 481 | asmlinkage __visible void __init start_kernel(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 482 | { |
Fabian Frederick | dd4d9fe | 2014-08-08 14:23:44 -0700 | [diff] [blame] | 483 | char *command_line; |
| 484 | char *after_dashes; |
Andrew Morton | 033ab7f | 2006-06-30 01:55:50 -0700 | [diff] [blame] | 485 | |
Aaron Tomlin | d4311ff | 2014-09-12 14:16:17 +0100 | [diff] [blame] | 486 | set_task_stack_end_magic(&init_task); |
Ming Lei | 73839c5 | 2011-11-17 13:34:31 +0800 | [diff] [blame] | 487 | smp_setup_processor_id(); |
Thomas Gleixner | 3ac7fe5 | 2008-04-30 00:55:01 -0700 | [diff] [blame] | 488 | debug_objects_early_init(); |
Ingo Molnar | 4205942 | 2008-02-14 09:44:08 +0100 | [diff] [blame] | 489 | |
| 490 | /* |
| 491 | * Set up the the initial canary ASAP: |
| 492 | */ |
| 493 | boot_init_stack_canary(); |
| 494 | |
Paul Menage | ddbcc7e | 2007-10-18 23:39:30 -0700 | [diff] [blame] | 495 | cgroup_init_early(); |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 496 | |
| 497 | local_irq_disable(); |
Tejun Heo | 2ce802f | 2011-01-20 12:06:35 +0100 | [diff] [blame] | 498 | early_boot_irqs_disabled = true; |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 499 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 500 | /* |
| 501 | * Interrupts are still disabled. Do necessary setups, then |
| 502 | * enable them |
| 503 | */ |
Stas Sergeev | 44fd229 | 2006-03-23 02:59:44 -0800 | [diff] [blame] | 504 | boot_cpu_init(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 505 | page_address_init(); |
Andrew Morton | ea676e8 | 2013-04-29 16:18:20 -0700 | [diff] [blame] | 506 | pr_notice("%s", linux_banner); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 507 | setup_arch(&command_line); |
Linus Torvalds | 6345d24 | 2011-05-29 11:32:28 -0700 | [diff] [blame] | 508 | mm_init_cpumask(&init_mm); |
Alon Bar-Lev | 30d7e0d | 2007-02-12 00:53:52 -0800 | [diff] [blame] | 509 | setup_command_line(command_line); |
Mike Travis | e0982e9 | 2008-03-26 14:23:48 -0700 | [diff] [blame] | 510 | setup_nr_cpu_ids(); |
Tejun Heo | d6647bd | 2009-07-21 17:11:50 +0900 | [diff] [blame] | 511 | setup_per_cpu_areas(); |
Thomas Gleixner | cff7d37 | 2016-02-26 18:43:28 +0000 | [diff] [blame] | 512 | boot_cpu_state_init(); |
Stas Sergeev | 44fd229 | 2006-03-23 02:59:44 -0800 | [diff] [blame] | 513 | smp_prepare_boot_cpu(); /* arch-specific boot-cpu hooks */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 514 | |
Jiang Liu | 9adb62a | 2012-07-31 16:43:28 -0700 | [diff] [blame] | 515 | build_all_zonelists(NULL, NULL); |
Pekka Enberg | 83b519e | 2009-06-10 19:40:04 +0300 | [diff] [blame] | 516 | page_alloc_init(); |
| 517 | |
Andrew Morton | ea676e8 | 2013-04-29 16:18:20 -0700 | [diff] [blame] | 518 | pr_notice("Kernel command line: %s\n", boot_command_line); |
Pekka Enberg | 83b519e | 2009-06-10 19:40:04 +0300 | [diff] [blame] | 519 | parse_early_param(); |
Rusty Russell | 51e158c | 2014-04-28 11:34:33 +0930 | [diff] [blame] | 520 | after_dashes = parse_args("Booting kernel", |
| 521 | static_command_line, __start___param, |
| 522 | __stop___param - __start___param, |
Luis R. Rodriguez | ecc8617 | 2015-03-30 16:20:03 -0700 | [diff] [blame] | 523 | -1, -1, NULL, &unknown_bootoption); |
Daniel Thompson | 3438cf5 | 2014-11-11 16:29:46 +1030 | [diff] [blame] | 524 | if (!IS_ERR_OR_NULL(after_dashes)) |
Rusty Russell | 51e158c | 2014-04-28 11:34:33 +0930 | [diff] [blame] | 525 | parse_args("Setting init args", after_dashes, NULL, 0, -1, -1, |
Luis R. Rodriguez | ecc8617 | 2015-03-30 16:20:03 -0700 | [diff] [blame] | 526 | NULL, set_init_arg); |
Jeremy Fitzhardinge | 97ce2c8 | 2011-10-12 16:17:54 -0700 | [diff] [blame] | 527 | |
| 528 | jump_label_init(); |
| 529 | |
Pekka Enberg | 83b519e | 2009-06-10 19:40:04 +0300 | [diff] [blame] | 530 | /* |
| 531 | * These use large bootmem allocations and must precede |
| 532 | * kmem_cache_init() |
| 533 | */ |
Mike Travis | 162a7e7 | 2011-05-24 17:13:20 -0700 | [diff] [blame] | 534 | setup_log_buf(0); |
Pekka Enberg | 83b519e | 2009-06-10 19:40:04 +0300 | [diff] [blame] | 535 | pidhash_init(); |
Pekka Enberg | 83b519e | 2009-06-10 19:40:04 +0300 | [diff] [blame] | 536 | vfs_caches_init_early(); |
| 537 | sort_main_extable(); |
| 538 | trap_init(); |
Pekka Enberg | 444f478 | 2009-06-11 18:29:06 +0300 | [diff] [blame] | 539 | mm_init(); |
KOSAKI Motohiro | de03c72 | 2011-05-24 17:12:15 -0700 | [diff] [blame] | 540 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 541 | /* |
| 542 | * Set up the scheduler prior starting any interrupts (such as the |
| 543 | * timer interrupt). Full topology setup happens at smp_init() |
| 544 | * time - but meanwhile we still have a functioning scheduler. |
| 545 | */ |
| 546 | sched_init(); |
| 547 | /* |
| 548 | * Disable preemption - early bootup scheduling is extremely |
| 549 | * fragile until we cpu_idle() for the first time. |
| 550 | */ |
| 551 | preempt_disable(); |
Fabian Frederick | dd4d9fe | 2014-08-08 14:23:44 -0700 | [diff] [blame] | 552 | if (WARN(!irqs_disabled(), |
| 553 | "Interrupts were enabled *very* early, fixing it\n")) |
Ard van Breemen | c4a6830 | 2007-01-05 16:36:19 -0800 | [diff] [blame] | 554 | local_irq_disable(); |
Peter Zijlstra | 9f58a20 | 2010-11-17 23:17:35 +0100 | [diff] [blame] | 555 | idr_init_cache(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 556 | rcu_init(); |
Steven Rostedt (Red Hat) | 5f893b2 | 2014-12-12 20:05:10 -0500 | [diff] [blame] | 557 | |
| 558 | /* trace_printk() and trace points may be used after this */ |
| 559 | trace_init(); |
| 560 | |
Frederic Weisbecker | 65f382f | 2013-07-11 19:12:32 +0200 | [diff] [blame] | 561 | context_tracking_init(); |
Yinghai Lu | 773e3eb | 2010-02-10 01:20:33 -0800 | [diff] [blame] | 562 | radix_tree_init(); |
Yinghai Lu | 0b8f1ef | 2008-12-05 18:58:31 -0800 | [diff] [blame] | 563 | /* init some links before init_ISA_irqs() */ |
| 564 | early_irq_init(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 565 | init_IRQ(); |
Thomas Gleixner | ad2b135 | 2013-03-05 15:14:05 +0100 | [diff] [blame] | 566 | tick_init(); |
Linus Torvalds | d6dd50e | 2014-10-13 15:44:12 +0200 | [diff] [blame] | 567 | rcu_init_nohz(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 568 | init_timers(); |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 569 | hrtimers_init(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 570 | softirq_init(); |
john stultz | ad59617 | 2006-06-26 00:25:06 -0700 | [diff] [blame] | 571 | timekeeping_init(); |
john stultz | 88fecaa | 2006-07-03 00:24:04 -0700 | [diff] [blame] | 572 | time_init(); |
Stephen Boyd | 38ff87f | 2013-06-01 23:39:40 -0700 | [diff] [blame] | 573 | sched_clock_postinit(); |
Petr Mladek | 42a0bb3 | 2016-05-20 17:00:33 -0700 | [diff] [blame] | 574 | printk_nmi_init(); |
Stephane Eranian | 9e63020 | 2013-04-03 14:21:33 +0200 | [diff] [blame] | 575 | perf_event_init(); |
Heiko Carstens | 93e0281 | 2006-07-03 00:24:24 -0700 | [diff] [blame] | 576 | profile_init(); |
Takao Indoh | d8ad7d1 | 2011-03-29 12:35:04 -0400 | [diff] [blame] | 577 | call_function_init(); |
Steven Rostedt | f91eb62 | 2013-04-29 16:18:18 -0700 | [diff] [blame] | 578 | WARN(!irqs_disabled(), "Interrupts were enabled early\n"); |
Tejun Heo | 2ce802f | 2011-01-20 12:06:35 +0100 | [diff] [blame] | 579 | early_boot_irqs_disabled = false; |
Heiko Carstens | 93e0281 | 2006-07-03 00:24:24 -0700 | [diff] [blame] | 580 | local_irq_enable(); |
Benjamin Herrenschmidt | dcce284 | 2009-06-18 13:24:12 +1000 | [diff] [blame] | 581 | |
Pekka Enberg | 7e85ee0 | 2009-06-12 14:03:06 +0300 | [diff] [blame] | 582 | kmem_cache_init_late(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 583 | |
| 584 | /* |
| 585 | * HACK ALERT! This is early. We're enabling the console before |
| 586 | * we've done PCI setups etc, and console_init() must be aware of |
| 587 | * this. But we do want output early, in case something goes wrong. |
| 588 | */ |
| 589 | console_init(); |
| 590 | if (panic_later) |
Tetsuo Handa | 499a458 | 2014-01-23 15:54:56 -0800 | [diff] [blame] | 591 | panic("Too many boot %s vars at `%s'", panic_later, |
| 592 | panic_param); |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 593 | |
| 594 | lockdep_info(); |
| 595 | |
Ingo Molnar | 9a11b49a | 2006-07-03 00:24:33 -0700 | [diff] [blame] | 596 | /* |
| 597 | * Need to run this when irqs are enabled, because it wants |
| 598 | * to self-test [hard/soft]-irqs on/off lock inversion bugs |
| 599 | * too: |
| 600 | */ |
| 601 | locking_selftest(); |
| 602 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 603 | #ifdef CONFIG_BLK_DEV_INITRD |
| 604 | if (initrd_start && !initrd_below_start_ok && |
Geert Uytterhoeven | bd673c7 | 2008-07-29 22:33:36 -0700 | [diff] [blame] | 605 | page_to_pfn(virt_to_page((void *)initrd_start)) < min_low_pfn) { |
Andrew Morton | ea676e8 | 2013-04-29 16:18:20 -0700 | [diff] [blame] | 606 | pr_crit("initrd overwritten (0x%08lx < 0x%08lx) - disabling it.\n", |
Geert Uytterhoeven | bd673c7 | 2008-07-29 22:33:36 -0700 | [diff] [blame] | 607 | page_to_pfn(virt_to_page((void *)initrd_start)), |
| 608 | min_low_pfn); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 609 | initrd_start = 0; |
| 610 | } |
| 611 | #endif |
Yang Shi | fe53ca5 | 2016-05-27 14:27:30 -0700 | [diff] [blame] | 612 | page_ext_init(); |
Thomas Gleixner | 3ac7fe5 | 2008-04-30 00:55:01 -0700 | [diff] [blame] | 613 | debug_objects_mem_init(); |
Catalin Marinas | 9b090f2 | 2011-05-19 16:25:30 +0100 | [diff] [blame] | 614 | kmemleak_init(); |
Christoph Lameter | e7c8d5c | 2005-06-21 17:14:47 -0700 | [diff] [blame] | 615 | setup_per_cpu_pageset(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 616 | numa_policy_init(); |
| 617 | if (late_time_init) |
| 618 | late_time_init(); |
Thomas Gleixner | fa84e9e | 2009-08-21 22:01:12 +0200 | [diff] [blame] | 619 | sched_clock_init(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 620 | calibrate_delay(); |
| 621 | pidmap_init(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 622 | anon_vma_init(); |
Rafael J. Wysocki | c4e1acb | 2014-03-13 00:22:58 +0100 | [diff] [blame] | 623 | acpi_early_init(); |
Linus Torvalds | 11520e5 | 2012-12-15 15:15:24 -0800 | [diff] [blame] | 624 | #ifdef CONFIG_X86 |
Matt Fleming | 83e6818 | 2012-11-14 09:42:35 +0000 | [diff] [blame] | 625 | if (efi_enabled(EFI_RUNTIME_SERVICES)) |
Linus Torvalds | 11520e5 | 2012-12-15 15:15:24 -0800 | [diff] [blame] | 626 | efi_enter_virtual_mode(); |
| 627 | #endif |
H. Peter Anvin | 197725d | 2014-05-04 10:00:49 -0700 | [diff] [blame] | 628 | #ifdef CONFIG_X86_ESPFIX64 |
H. Peter Anvin | 3891a04 | 2014-04-29 16:46:09 -0700 | [diff] [blame] | 629 | /* Should be run before the first non-init thread is created */ |
| 630 | init_espfix_bsp(); |
| 631 | #endif |
Linus Torvalds | b235bee | 2016-06-24 15:09:37 -0700 | [diff] [blame] | 632 | thread_stack_cache_init(); |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 633 | cred_init(); |
Heinrich Schuchardt | ff691f6 | 2015-04-16 12:47:44 -0700 | [diff] [blame] | 634 | fork_init(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 635 | proc_caches_init(); |
| 636 | buffer_init(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 637 | key_init(); |
| 638 | security_init(); |
Jason Wessel | 0b4b382 | 2010-05-20 21:04:29 -0500 | [diff] [blame] | 639 | dbg_late_init(); |
Mel Gorman | 4248b0d | 2015-08-06 15:46:20 -0700 | [diff] [blame] | 640 | vfs_caches_init(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 641 | signals_init(); |
| 642 | /* rootfs populating might need page-writeback */ |
| 643 | page_writeback_init(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 644 | proc_root_init(); |
Al Viro | e149ed2 | 2014-11-01 10:57:28 -0400 | [diff] [blame] | 645 | nsfs_init(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 646 | cpuset_init(); |
Zefan Li | 695df21 | 2015-03-04 17:09:33 +0800 | [diff] [blame] | 647 | cgroup_init(); |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 648 | taskstats_init_early(); |
Shailabh Nagar | ca74e92 | 2006-07-14 00:24:36 -0700 | [diff] [blame] | 649 | delayacct_init(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 650 | |
| 651 | check_bugs(); |
| 652 | |
Rafael J. Wysocki | b064a8f | 2015-06-10 01:33:36 +0200 | [diff] [blame] | 653 | acpi_subsystem_init(); |
Thomas Gleixner | e7ff3a4 | 2016-12-09 19:29:10 +0100 | [diff] [blame^] | 654 | arch_post_acpi_subsys_init(); |
Feng Tang | 6ae6996 | 2009-08-14 15:13:46 -0400 | [diff] [blame] | 655 | sfi_init_late(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 656 | |
Matt Fleming | 83e6818 | 2012-11-14 09:42:35 +0000 | [diff] [blame] | 657 | if (efi_enabled(EFI_RUNTIME_SERVICES)) { |
Josh Triplett | 2223af3 | 2012-09-28 17:57:05 -0700 | [diff] [blame] | 658 | efi_late_init(); |
Josh Triplett | 7851079 | 2012-09-28 17:55:44 -0700 | [diff] [blame] | 659 | efi_free_boot_services(); |
Josh Triplett | 2223af3 | 2012-09-28 17:57:05 -0700 | [diff] [blame] | 660 | } |
Josh Triplett | 7851079 | 2012-09-28 17:55:44 -0700 | [diff] [blame] | 661 | |
Steven Rostedt | 68bf21a | 2008-08-14 15:45:08 -0400 | [diff] [blame] | 662 | ftrace_init(); |
| 663 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 664 | /* Do the rest non-__init'ed, we're now alive */ |
| 665 | rest_init(); |
| 666 | } |
| 667 | |
Peter Oberparleiter | b99b87f | 2009-06-17 16:28:03 -0700 | [diff] [blame] | 668 | /* Call all constructor functions linked into the kernel. */ |
| 669 | static void __init do_ctors(void) |
| 670 | { |
| 671 | #ifdef CONFIG_CONSTRUCTORS |
H Hartley Sweeten | 196a15b | 2009-12-14 18:00:18 -0800 | [diff] [blame] | 672 | ctor_fn_t *fn = (ctor_fn_t *) __ctors_start; |
Peter Oberparleiter | b99b87f | 2009-06-17 16:28:03 -0700 | [diff] [blame] | 673 | |
H Hartley Sweeten | 196a15b | 2009-12-14 18:00:18 -0800 | [diff] [blame] | 674 | for (; fn < (ctor_fn_t *) __ctors_end; fn++) |
| 675 | (*fn)(); |
Peter Oberparleiter | b99b87f | 2009-06-17 16:28:03 -0700 | [diff] [blame] | 676 | #endif |
| 677 | } |
| 678 | |
Rusty Russell | 2329abf | 2012-01-13 09:32:18 +1030 | [diff] [blame] | 679 | bool initcall_debug; |
Rusty Russell | d0ea3d7 | 2008-10-22 10:00:23 -0500 | [diff] [blame] | 680 | core_param(initcall_debug, initcall_debug, bool, 0644); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 681 | |
Prarit Bhargava | 7b0b73d | 2014-06-04 16:12:17 -0700 | [diff] [blame] | 682 | #ifdef CONFIG_KALLSYMS |
| 683 | struct blacklist_entry { |
| 684 | struct list_head next; |
| 685 | char *buf; |
| 686 | }; |
| 687 | |
| 688 | static __initdata_or_module LIST_HEAD(blacklisted_initcalls); |
| 689 | |
| 690 | static int __init initcall_blacklist(char *str) |
| 691 | { |
| 692 | char *str_entry; |
| 693 | struct blacklist_entry *entry; |
| 694 | |
| 695 | /* str argument is a comma-separated list of functions */ |
| 696 | do { |
| 697 | str_entry = strsep(&str, ","); |
| 698 | if (str_entry) { |
| 699 | pr_debug("blacklisting initcall %s\n", str_entry); |
| 700 | entry = alloc_bootmem(sizeof(*entry)); |
| 701 | entry->buf = alloc_bootmem(strlen(str_entry) + 1); |
| 702 | strcpy(entry->buf, str_entry); |
| 703 | list_add(&entry->next, &blacklisted_initcalls); |
| 704 | } |
| 705 | } while (str_entry); |
| 706 | |
| 707 | return 0; |
| 708 | } |
| 709 | |
| 710 | static bool __init_or_module initcall_blacklisted(initcall_t fn) |
| 711 | { |
Prarit Bhargava | 7b0b73d | 2014-06-04 16:12:17 -0700 | [diff] [blame] | 712 | struct blacklist_entry *entry; |
Rasmus Villemoes | c8cdd2b | 2016-05-20 17:04:27 -0700 | [diff] [blame] | 713 | char fn_name[KSYM_SYMBOL_LEN]; |
Rasmus Villemoes | 0fd5ed8 | 2016-06-24 14:50:30 -0700 | [diff] [blame] | 714 | unsigned long addr; |
Prarit Bhargava | 7b0b73d | 2014-06-04 16:12:17 -0700 | [diff] [blame] | 715 | |
Rasmus Villemoes | c8cdd2b | 2016-05-20 17:04:27 -0700 | [diff] [blame] | 716 | if (list_empty(&blacklisted_initcalls)) |
Prarit Bhargava | 7b0b73d | 2014-06-04 16:12:17 -0700 | [diff] [blame] | 717 | return false; |
| 718 | |
Rasmus Villemoes | 0fd5ed8 | 2016-06-24 14:50:30 -0700 | [diff] [blame] | 719 | addr = (unsigned long) dereference_function_descriptor(fn); |
| 720 | sprint_symbol_no_offset(fn_name, addr); |
Rasmus Villemoes | c8cdd2b | 2016-05-20 17:04:27 -0700 | [diff] [blame] | 721 | |
Prarit Bhargava | 841c06d | 2016-08-02 14:07:15 -0700 | [diff] [blame] | 722 | /* |
| 723 | * fn will be "function_name [module_name]" where [module_name] is not |
| 724 | * displayed for built-in init functions. Strip off the [module_name]. |
| 725 | */ |
| 726 | strreplace(fn_name, ' ', '\0'); |
| 727 | |
Geliang Tang | e6fd1fb | 2016-03-15 14:52:46 -0700 | [diff] [blame] | 728 | list_for_each_entry(entry, &blacklisted_initcalls, next) { |
Prarit Bhargava | 7b0b73d | 2014-06-04 16:12:17 -0700 | [diff] [blame] | 729 | if (!strcmp(fn_name, entry->buf)) { |
| 730 | pr_debug("initcall %s blacklisted\n", fn_name); |
Prarit Bhargava | 7b0b73d | 2014-06-04 16:12:17 -0700 | [diff] [blame] | 731 | return true; |
| 732 | } |
| 733 | } |
| 734 | |
Prarit Bhargava | 7b0b73d | 2014-06-04 16:12:17 -0700 | [diff] [blame] | 735 | return false; |
| 736 | } |
| 737 | #else |
| 738 | static int __init initcall_blacklist(char *str) |
| 739 | { |
| 740 | pr_warn("initcall_blacklist requires CONFIG_KALLSYMS\n"); |
| 741 | return 0; |
| 742 | } |
| 743 | |
| 744 | static bool __init_or_module initcall_blacklisted(initcall_t fn) |
| 745 | { |
| 746 | return false; |
| 747 | } |
| 748 | #endif |
| 749 | __setup("initcall_blacklist=", initcall_blacklist); |
| 750 | |
Kevin Winchester | e446127 | 2010-08-09 17:20:32 -0700 | [diff] [blame] | 751 | static int __init_or_module do_one_initcall_debug(initcall_t fn) |
Linus Torvalds | e0df154 | 2008-05-15 18:14:01 -0700 | [diff] [blame] | 752 | { |
Frederic Weisbecker | 7423907 | 2008-11-11 23:24:42 +0100 | [diff] [blame] | 753 | ktime_t calltime, delta, rettime; |
Américo Wang | 30dbb20e | 2010-05-26 18:57:53 +0800 | [diff] [blame] | 754 | unsigned long long duration; |
| 755 | int ret; |
Linus Torvalds | e0df154 | 2008-05-15 18:14:01 -0700 | [diff] [blame] | 756 | |
Andrew Morton | d62cf81 | 2014-06-04 16:12:16 -0700 | [diff] [blame] | 757 | printk(KERN_DEBUG "calling %pF @ %i\n", fn, task_pid_nr(current)); |
Kevin Winchester | 22c5c03 | 2010-08-09 17:20:32 -0700 | [diff] [blame] | 758 | calltime = ktime_get(); |
Américo Wang | 30dbb20e | 2010-05-26 18:57:53 +0800 | [diff] [blame] | 759 | ret = fn(); |
Kevin Winchester | 22c5c03 | 2010-08-09 17:20:32 -0700 | [diff] [blame] | 760 | rettime = ktime_get(); |
| 761 | delta = ktime_sub(rettime, calltime); |
| 762 | duration = (unsigned long long) ktime_to_ns(delta) >> 10; |
Andrew Morton | d62cf81 | 2014-06-04 16:12:16 -0700 | [diff] [blame] | 763 | printk(KERN_DEBUG "initcall %pF returned %d after %lld usecs\n", |
Andrew Morton | ea676e8 | 2013-04-29 16:18:20 -0700 | [diff] [blame] | 764 | fn, ret, duration); |
Linus Torvalds | e0df154 | 2008-05-15 18:14:01 -0700 | [diff] [blame] | 765 | |
Kevin Winchester | 22c5c03 | 2010-08-09 17:20:32 -0700 | [diff] [blame] | 766 | return ret; |
| 767 | } |
| 768 | |
Kevin Winchester | e446127 | 2010-08-09 17:20:32 -0700 | [diff] [blame] | 769 | int __init_or_module do_one_initcall(initcall_t fn) |
Kevin Winchester | 22c5c03 | 2010-08-09 17:20:32 -0700 | [diff] [blame] | 770 | { |
| 771 | int count = preempt_count(); |
| 772 | int ret; |
Steven Rostedt | ff1c8fa | 2013-07-03 15:05:37 -0700 | [diff] [blame] | 773 | char msgbuf[64]; |
Kevin Winchester | 22c5c03 | 2010-08-09 17:20:32 -0700 | [diff] [blame] | 774 | |
Prarit Bhargava | 7b0b73d | 2014-06-04 16:12:17 -0700 | [diff] [blame] | 775 | if (initcall_blacklisted(fn)) |
| 776 | return -EPERM; |
| 777 | |
Kevin Winchester | 22c5c03 | 2010-08-09 17:20:32 -0700 | [diff] [blame] | 778 | if (initcall_debug) |
| 779 | ret = do_one_initcall_debug(fn); |
| 780 | else |
| 781 | ret = fn(); |
Linus Torvalds | e0df154 | 2008-05-15 18:14:01 -0700 | [diff] [blame] | 782 | |
| 783 | msgbuf[0] = 0; |
| 784 | |
Linus Torvalds | e0df154 | 2008-05-15 18:14:01 -0700 | [diff] [blame] | 785 | if (preempt_count() != count) { |
Steven Rostedt | bf5d770 | 2013-05-01 13:35:51 -0400 | [diff] [blame] | 786 | sprintf(msgbuf, "preemption imbalance "); |
Peter Zijlstra | 4a2b4b2 | 2013-08-14 14:55:24 +0200 | [diff] [blame] | 787 | preempt_count_set(count); |
Linus Torvalds | e0df154 | 2008-05-15 18:14:01 -0700 | [diff] [blame] | 788 | } |
| 789 | if (irqs_disabled()) { |
Cyrill Gorcunov | a76bfd0 | 2008-05-15 13:52:41 -0700 | [diff] [blame] | 790 | strlcat(msgbuf, "disabled interrupts ", sizeof(msgbuf)); |
Linus Torvalds | e0df154 | 2008-05-15 18:14:01 -0700 | [diff] [blame] | 791 | local_irq_enable(); |
| 792 | } |
Steven Rostedt | f91eb62 | 2013-04-29 16:18:18 -0700 | [diff] [blame] | 793 | WARN(msgbuf[0], "initcall %pF returned with %s\n", fn, msgbuf); |
Arjan van de Ven | 59f9415 | 2008-07-30 12:49:02 -0700 | [diff] [blame] | 794 | |
Emese Revfy | 38addce | 2016-06-20 20:41:19 +0200 | [diff] [blame] | 795 | add_latent_entropy(); |
Américo Wang | 30dbb20e | 2010-05-26 18:57:53 +0800 | [diff] [blame] | 796 | return ret; |
Linus Torvalds | e0df154 | 2008-05-15 18:14:01 -0700 | [diff] [blame] | 797 | } |
| 798 | |
| 799 | |
Pawel Moll | 026cee0 | 2012-03-26 12:50:51 +1030 | [diff] [blame] | 800 | extern initcall_t __initcall_start[]; |
| 801 | extern initcall_t __initcall0_start[]; |
| 802 | extern initcall_t __initcall1_start[]; |
| 803 | extern initcall_t __initcall2_start[]; |
| 804 | extern initcall_t __initcall3_start[]; |
| 805 | extern initcall_t __initcall4_start[]; |
| 806 | extern initcall_t __initcall5_start[]; |
| 807 | extern initcall_t __initcall6_start[]; |
| 808 | extern initcall_t __initcall7_start[]; |
| 809 | extern initcall_t __initcall_end[]; |
| 810 | |
| 811 | static initcall_t *initcall_levels[] __initdata = { |
| 812 | __initcall0_start, |
| 813 | __initcall1_start, |
| 814 | __initcall2_start, |
| 815 | __initcall3_start, |
| 816 | __initcall4_start, |
| 817 | __initcall5_start, |
| 818 | __initcall6_start, |
| 819 | __initcall7_start, |
| 820 | __initcall_end, |
| 821 | }; |
| 822 | |
Jim Cromie | 96263d2 | 2012-06-14 16:00:59 -0600 | [diff] [blame] | 823 | /* Keep these in sync with initcalls in include/linux/init.h */ |
Pawel Moll | 026cee0 | 2012-03-26 12:50:51 +1030 | [diff] [blame] | 824 | static char *initcall_level_names[] __initdata = { |
Jim Cromie | 9fb48c7 | 2012-04-27 14:30:34 -0600 | [diff] [blame] | 825 | "early", |
| 826 | "core", |
| 827 | "postcore", |
| 828 | "arch", |
| 829 | "subsys", |
| 830 | "fs", |
| 831 | "device", |
| 832 | "late", |
Pawel Moll | 026cee0 | 2012-03-26 12:50:51 +1030 | [diff] [blame] | 833 | }; |
| 834 | |
Pawel Moll | 026cee0 | 2012-03-26 12:50:51 +1030 | [diff] [blame] | 835 | static void __init do_initcall_level(int level) |
| 836 | { |
Pawel Moll | 026cee0 | 2012-03-26 12:50:51 +1030 | [diff] [blame] | 837 | initcall_t *fn; |
| 838 | |
Krzysztof Mazur | 08746a6 | 2013-10-31 13:45:39 +1030 | [diff] [blame] | 839 | strcpy(initcall_command_line, saved_command_line); |
Pawel Moll | 026cee0 | 2012-03-26 12:50:51 +1030 | [diff] [blame] | 840 | parse_args(initcall_level_names[level], |
Krzysztof Mazur | 08746a6 | 2013-10-31 13:45:39 +1030 | [diff] [blame] | 841 | initcall_command_line, __start___param, |
Pawel Moll | 026cee0 | 2012-03-26 12:50:51 +1030 | [diff] [blame] | 842 | __stop___param - __start___param, |
| 843 | level, level, |
Luis R. Rodriguez | ecc8617 | 2015-03-30 16:20:03 -0700 | [diff] [blame] | 844 | NULL, &repair_env_string); |
Pawel Moll | 026cee0 | 2012-03-26 12:50:51 +1030 | [diff] [blame] | 845 | |
| 846 | for (fn = initcall_levels[level]; fn < initcall_levels[level+1]; fn++) |
| 847 | do_one_initcall(*fn); |
| 848 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 849 | |
| 850 | static void __init do_initcalls(void) |
| 851 | { |
Pawel Moll | 026cee0 | 2012-03-26 12:50:51 +1030 | [diff] [blame] | 852 | int level; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 853 | |
Borislav Petkov | 19efb72 | 2012-06-01 18:56:00 +0200 | [diff] [blame] | 854 | for (level = 0; level < ARRAY_SIZE(initcall_levels) - 1; level++) |
Pawel Moll | 026cee0 | 2012-03-26 12:50:51 +1030 | [diff] [blame] | 855 | do_initcall_level(level); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 856 | } |
| 857 | |
| 858 | /* |
| 859 | * Ok, the machine is now initialized. None of the devices |
| 860 | * have been touched yet, but the CPU subsystem is up and |
| 861 | * running, and memory and process management works. |
| 862 | * |
| 863 | * Now we can finally start doing some real work.. |
| 864 | */ |
| 865 | static void __init do_basic_setup(void) |
| 866 | { |
Lai Jiangshan | 759ee09 | 2009-03-25 17:06:30 +0800 | [diff] [blame] | 867 | cpuset_init_smp(); |
Hugh Dickins | 41ffe5d | 2011-08-03 16:21:21 -0700 | [diff] [blame] | 868 | shmem_init(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 869 | driver_init(); |
Eric W. Biederman | b04c3af | 2007-02-14 00:33:57 -0800 | [diff] [blame] | 870 | init_irq_proc(); |
Peter Oberparleiter | b99b87f | 2009-06-17 16:28:03 -0700 | [diff] [blame] | 871 | do_ctors(); |
Linus Torvalds | d5767c5 | 2011-09-28 10:23:44 -0700 | [diff] [blame] | 872 | usermodehelper_enable(); |
wangyanqing | b0f8437 | 2011-09-29 15:09:40 +0800 | [diff] [blame] | 873 | do_initcalls(); |
Theodore Ts'o | 47d06e5 | 2013-09-10 10:52:35 -0400 | [diff] [blame] | 874 | random_int_secret_init(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 875 | } |
| 876 | |
Eduard - Gabriel Munteanu | 7babe8d | 2008-07-25 19:45:11 -0700 | [diff] [blame] | 877 | static void __init do_pre_smp_initcalls(void) |
Eduard - Gabriel Munteanu | c2147a5 | 2008-07-25 19:45:11 -0700 | [diff] [blame] | 878 | { |
H Hartley Sweeten | 196a15b | 2009-12-14 18:00:18 -0800 | [diff] [blame] | 879 | initcall_t *fn; |
Eduard - Gabriel Munteanu | c2147a5 | 2008-07-25 19:45:11 -0700 | [diff] [blame] | 880 | |
Pawel Moll | 026cee0 | 2012-03-26 12:50:51 +1030 | [diff] [blame] | 881 | for (fn = __initcall_start; fn < __initcall0_start; fn++) |
H Hartley Sweeten | 196a15b | 2009-12-14 18:00:18 -0800 | [diff] [blame] | 882 | do_one_initcall(*fn); |
Eduard - Gabriel Munteanu | c2147a5 | 2008-07-25 19:45:11 -0700 | [diff] [blame] | 883 | } |
| 884 | |
Tejun Heo | bb813f4 | 2013-01-18 14:05:56 -0800 | [diff] [blame] | 885 | /* |
| 886 | * This function requests modules which should be loaded by default and is |
| 887 | * called twice right after initrd is mounted and right before init is |
| 888 | * exec'd. If such modules are on either initrd or rootfs, they will be |
| 889 | * loaded before control is passed to userland. |
| 890 | */ |
| 891 | void __init load_default_modules(void) |
| 892 | { |
| 893 | load_default_elevator_module(); |
| 894 | } |
| 895 | |
Al Viro | a74fb73 | 2012-10-10 21:28:25 -0400 | [diff] [blame] | 896 | static int run_init_process(const char *init_filename) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 897 | { |
| 898 | argv_init[0] = init_filename; |
Linus Torvalds | c4ad8f9 | 2014-02-05 12:54:53 -0800 | [diff] [blame] | 899 | return do_execve(getname_kernel(init_filename), |
Al Viro | ae903ca | 2012-12-14 12:44:11 -0500 | [diff] [blame] | 900 | (const char __user *const __user *)argv_init, |
| 901 | (const char __user *const __user *)envp_init); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 902 | } |
| 903 | |
Michael Opdenacker | ba24762 | 2013-11-12 15:10:21 -0800 | [diff] [blame] | 904 | static int try_to_run_init_process(const char *init_filename) |
| 905 | { |
| 906 | int ret; |
| 907 | |
| 908 | ret = run_init_process(init_filename); |
| 909 | |
| 910 | if (ret && ret != -ENOENT) { |
| 911 | pr_err("Starting init: %s exists but couldn't execute it (error %d)\n", |
| 912 | init_filename, ret); |
| 913 | } |
| 914 | |
| 915 | return ret; |
| 916 | } |
| 917 | |
Vineet Gupta | f80b0c9 | 2012-12-21 12:25:44 +0530 | [diff] [blame] | 918 | static noinline void __init kernel_init_freeable(void); |
Al Viro | d6b2123 | 2012-10-10 19:57:26 -0400 | [diff] [blame] | 919 | |
Kees Cook | d2aa1ac | 2016-02-17 14:41:13 -0800 | [diff] [blame] | 920 | #ifdef CONFIG_DEBUG_RODATA |
| 921 | static bool rodata_enabled = true; |
| 922 | static int __init set_debug_rodata(char *str) |
| 923 | { |
| 924 | return strtobool(str, &rodata_enabled); |
| 925 | } |
| 926 | __setup("rodata=", set_debug_rodata); |
| 927 | |
| 928 | static void mark_readonly(void) |
| 929 | { |
| 930 | if (rodata_enabled) |
| 931 | mark_rodata_ro(); |
| 932 | else |
| 933 | pr_info("Kernel memory protection disabled.\n"); |
| 934 | } |
| 935 | #else |
| 936 | static inline void mark_readonly(void) |
| 937 | { |
| 938 | pr_warn("This architecture does not have kernel memory protection.\n"); |
| 939 | } |
| 940 | #endif |
| 941 | |
Al Viro | d6b2123 | 2012-10-10 19:57:26 -0400 | [diff] [blame] | 942 | static int __ref kernel_init(void *unused) |
Vivek Goyal | ee5bfa6 | 2007-02-13 13:26:22 +0100 | [diff] [blame] | 943 | { |
Michael Opdenacker | ba24762 | 2013-11-12 15:10:21 -0800 | [diff] [blame] | 944 | int ret; |
| 945 | |
Al Viro | d6b2123 | 2012-10-10 19:57:26 -0400 | [diff] [blame] | 946 | kernel_init_freeable(); |
Arjan van de Ven | 22a9d64 | 2009-01-07 08:45:46 -0800 | [diff] [blame] | 947 | /* need to finish all async __init code before freeing the memory */ |
| 948 | async_synchronize_full(); |
Vivek Goyal | ee5bfa6 | 2007-02-13 13:26:22 +0100 | [diff] [blame] | 949 | free_initmem(); |
Kees Cook | d2aa1ac | 2016-02-17 14:41:13 -0800 | [diff] [blame] | 950 | mark_readonly(); |
Vivek Goyal | ee5bfa6 | 2007-02-13 13:26:22 +0100 | [diff] [blame] | 951 | system_state = SYSTEM_RUNNING; |
| 952 | numa_default_policy(); |
| 953 | |
Al Viro | 4a9d4b0 | 2012-06-24 09:56:45 +0400 | [diff] [blame] | 954 | flush_delayed_fput(); |
Oleg Nesterov | fae5fa4 | 2008-04-30 00:53:03 -0700 | [diff] [blame] | 955 | |
Paul E. McKenney | 967dcb8 | 2015-11-25 16:52:36 -0800 | [diff] [blame] | 956 | rcu_end_inkernel_boot(); |
| 957 | |
Vivek Goyal | ee5bfa6 | 2007-02-13 13:26:22 +0100 | [diff] [blame] | 958 | if (ramdisk_execute_command) { |
Michael Opdenacker | ba24762 | 2013-11-12 15:10:21 -0800 | [diff] [blame] | 959 | ret = run_init_process(ramdisk_execute_command); |
| 960 | if (!ret) |
Al Viro | a74fb73 | 2012-10-10 21:28:25 -0400 | [diff] [blame] | 961 | return 0; |
Michael Opdenacker | ba24762 | 2013-11-12 15:10:21 -0800 | [diff] [blame] | 962 | pr_err("Failed to execute %s (error %d)\n", |
| 963 | ramdisk_execute_command, ret); |
Vivek Goyal | ee5bfa6 | 2007-02-13 13:26:22 +0100 | [diff] [blame] | 964 | } |
| 965 | |
| 966 | /* |
| 967 | * We try each of these until one succeeds. |
| 968 | * |
| 969 | * The Bourne shell can be used instead of init if we are |
| 970 | * trying to recover a really broken machine. |
| 971 | */ |
| 972 | if (execute_command) { |
Michael Opdenacker | ba24762 | 2013-11-12 15:10:21 -0800 | [diff] [blame] | 973 | ret = run_init_process(execute_command); |
| 974 | if (!ret) |
Al Viro | a74fb73 | 2012-10-10 21:28:25 -0400 | [diff] [blame] | 975 | return 0; |
Andy Lutomirski | 6ef4536 | 2014-12-10 15:52:19 -0800 | [diff] [blame] | 976 | panic("Requested init %s failed (error %d).", |
| 977 | execute_command, ret); |
Vivek Goyal | ee5bfa6 | 2007-02-13 13:26:22 +0100 | [diff] [blame] | 978 | } |
Michael Opdenacker | ba24762 | 2013-11-12 15:10:21 -0800 | [diff] [blame] | 979 | if (!try_to_run_init_process("/sbin/init") || |
| 980 | !try_to_run_init_process("/etc/init") || |
| 981 | !try_to_run_init_process("/bin/init") || |
| 982 | !try_to_run_init_process("/bin/sh")) |
Al Viro | a74fb73 | 2012-10-10 21:28:25 -0400 | [diff] [blame] | 983 | return 0; |
Vivek Goyal | ee5bfa6 | 2007-02-13 13:26:22 +0100 | [diff] [blame] | 984 | |
Michael Opdenacker | ba24762 | 2013-11-12 15:10:21 -0800 | [diff] [blame] | 985 | panic("No working init found. Try passing init= option to kernel. " |
Andreas Mohr | 9a85b8d | 2010-03-05 13:42:39 -0800 | [diff] [blame] | 986 | "See Linux Documentation/init.txt for guidance."); |
Vivek Goyal | ee5bfa6 | 2007-02-13 13:26:22 +0100 | [diff] [blame] | 987 | } |
| 988 | |
Vineet Gupta | f80b0c9 | 2012-12-21 12:25:44 +0530 | [diff] [blame] | 989 | static noinline void __init kernel_init_freeable(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 990 | { |
Peter Zijlstra | b433c3d | 2010-06-28 16:51:01 +0200 | [diff] [blame] | 991 | /* |
| 992 | * Wait until kthreadd is all set-up. |
| 993 | */ |
| 994 | wait_for_completion(&kthreadd_done); |
Linus Torvalds | 31a6710 | 2012-05-21 12:52:42 -0700 | [diff] [blame] | 995 | |
| 996 | /* Now the scheduler is fully set up and can do blocking allocations */ |
| 997 | gfp_allowed_mask = __GFP_BITS_MASK; |
| 998 | |
Miao Xie | 58568d2 | 2009-06-16 15:31:49 -0700 | [diff] [blame] | 999 | /* |
| 1000 | * init can allocate pages on any node |
| 1001 | */ |
Lai Jiangshan | 3c466d4 | 2012-12-12 13:51:40 -0800 | [diff] [blame] | 1002 | set_mems_allowed(node_states[N_MEMORY]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1003 | /* |
| 1004 | * init can run on any cpu. |
| 1005 | */ |
Rusty Russell | 1a2142a | 2009-03-30 22:05:10 -0600 | [diff] [blame] | 1006 | set_cpus_allowed_ptr(current, cpu_all_mask); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1007 | |
Cedric Le Goater | 9ec5209 | 2006-10-02 02:19:00 -0700 | [diff] [blame] | 1008 | cad_pid = task_pid(current); |
| 1009 | |
Andi Kleen | ca74a6f | 2008-01-30 13:33:17 +0100 | [diff] [blame] | 1010 | smp_prepare_cpus(setup_max_cpus); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1011 | |
| 1012 | do_pre_smp_initcalls(); |
Peter Zijlstra | 004417a | 2010-11-25 18:38:29 +0100 | [diff] [blame] | 1013 | lockup_detector_init(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1014 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1015 | smp_init(); |
| 1016 | sched_init_smp(); |
| 1017 | |
Mel Gorman | 0e1cc95 | 2015-06-30 14:57:27 -0700 | [diff] [blame] | 1018 | page_alloc_init_late(); |
| 1019 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1020 | do_basic_setup(); |
| 1021 | |
Eric W. Biederman | 2bd3a997 | 2010-03-02 23:53:19 -0800 | [diff] [blame] | 1022 | /* Open the /dev/console on the rootfs, this should never fail */ |
| 1023 | if (sys_open((const char __user *) "/dev/console", O_RDWR, 0) < 0) |
Andrew Morton | ea676e8 | 2013-04-29 16:18:20 -0700 | [diff] [blame] | 1024 | pr_err("Warning: unable to open an initial console.\n"); |
Eric W. Biederman | 2bd3a997 | 2010-03-02 23:53:19 -0800 | [diff] [blame] | 1025 | |
| 1026 | (void) sys_dup(0); |
| 1027 | (void) sys_dup(0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1028 | /* |
| 1029 | * check if there is an early userspace init. If yes, let it do all |
| 1030 | * the work |
| 1031 | */ |
Olof Johansson | ffdfc40 | 2005-09-06 15:17:19 -0700 | [diff] [blame] | 1032 | |
| 1033 | if (!ramdisk_execute_command) |
| 1034 | ramdisk_execute_command = "/init"; |
| 1035 | |
| 1036 | if (sys_access((const char __user *) ramdisk_execute_command, 0) != 0) { |
| 1037 | ramdisk_execute_command = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1038 | prepare_namespace(); |
Olof Johansson | ffdfc40 | 2005-09-06 15:17:19 -0700 | [diff] [blame] | 1039 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1040 | |
| 1041 | /* |
| 1042 | * Ok, we have completed the initial bootup, and |
| 1043 | * we're essentially up and running. Get rid of the |
| 1044 | * initmem segments and start the user-mode stuff.. |
Dmitry Kasatkin | c9cd2ce | 2014-11-05 17:01:15 +0200 | [diff] [blame] | 1045 | * |
| 1046 | * rootfs is available now, try loading the public keys |
| 1047 | * and default modules |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1048 | */ |
Tejun Heo | bb813f4 | 2013-01-18 14:05:56 -0800 | [diff] [blame] | 1049 | |
Dmitry Kasatkin | c9cd2ce | 2014-11-05 17:01:15 +0200 | [diff] [blame] | 1050 | integrity_load_keys(); |
Tejun Heo | bb813f4 | 2013-01-18 14:05:56 -0800 | [diff] [blame] | 1051 | load_default_modules(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1052 | } |