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Thomas Gleixner457c8992019-05-19 13:08:55 +01001// SPDX-License-Identifier: GPL-2.0-only
Linus Torvalds1da177e2005-04-16 15:20:36 -07002/*
3 * linux/init/main.c
4 *
5 * Copyright (C) 1991, 1992 Linus Torvalds
6 *
7 * GK 2/5/95 - Changed to support mounting root fs via NFS
8 * Added initrd & change_root: Werner Almesberger & Hans Lermen, Feb '96
9 * Moan early if gcc is old, avoiding bogus kernels - Paul Gortmaker, May '96
Fabian Frederickdd4d9fe2014-08-08 14:23:44 -070010 * Simplified starting of init: Michael A. Griffith <grif@acm.org>
Linus Torvalds1da177e2005-04-16 15:20:36 -070011 */
12
Andrew Mortonea676e82013-04-29 16:18:20 -070013#define DEBUG /* Enable initcall_debug */
14
Linus Torvalds1da177e2005-04-16 15:20:36 -070015#include <linux/types.h>
Paul Gortmaker8a293be2016-07-23 14:01:45 -040016#include <linux/extable.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070017#include <linux/module.h>
18#include <linux/proc_fs.h>
Ingo Molnar5c2c5c52017-02-05 14:24:31 +010019#include <linux/binfmts.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070020#include <linux/kernel.h>
21#include <linux/syscalls.h>
Ingo Molnar9b5609f2008-02-14 09:41:09 +010022#include <linux/stackprotector.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070023#include <linux/string.h>
24#include <linux/ctype.h>
25#include <linux/delay.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070026#include <linux/ioport.h>
27#include <linux/init.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070028#include <linux/initrd.h>
Mike Rapoport57c8a662018-10-30 15:09:49 -070029#include <linux/memblock.h>
Len Brown4a7a16d2009-06-12 20:42:08 -040030#include <linux/acpi.h>
Masami Hiramatsu7684b852020-01-11 01:03:44 +090031#include <linux/bootconfig.h>
Nicolas Pitre0c688612017-04-12 18:37:14 -040032#include <linux/console.h>
Ingo Molnar38b8d202017-02-08 18:51:31 +010033#include <linux/nmi.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070034#include <linux/percpu.h>
35#include <linux/kmod.h>
Masami Hiramatsu82d083a2020-09-10 17:55:05 +090036#include <linux/kprobes.h>
Nick Piggindb64fe02008-10-18 20:27:03 -070037#include <linux/vmalloc.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070038#include <linux/kernel_stat.h>
Rusty Russelld7cd5612006-12-07 02:14:08 +010039#include <linux/start_kernel.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070040#include <linux/security.h>
Jens Axboe3d442232008-06-26 11:21:34 +020041#include <linux/smp.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070042#include <linux/profile.h>
43#include <linux/rcupdate.h>
44#include <linux/moduleparam.h>
45#include <linux/kallsyms.h>
46#include <linux/writeback.h>
47#include <linux/cpu.h>
48#include <linux/cpuset.h>
Paul Menageddbcc7e2007-10-18 23:39:30 -070049#include <linux/cgroup.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070050#include <linux/efi.h>
Thomas Gleixner906568c2007-02-16 01:28:01 -080051#include <linux/tick.h>
Frederic Weisbecker78634062017-10-27 04:42:28 +020052#include <linux/sched/isolation.h>
Andrew Morton6168a702007-02-17 21:22:39 -080053#include <linux/interrupt.h>
Shailabh Nagarc7572492006-07-14 00:24:40 -070054#include <linux/taskstats_kern.h>
Shailabh Nagarca74e922006-07-14 00:24:36 -070055#include <linux/delayacct.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070056#include <linux/unistd.h>
Alexey Dobriyan3ea056c2018-04-10 16:32:36 -070057#include <linux/utsname.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070058#include <linux/rmap.h>
59#include <linux/mempolicy.h>
60#include <linux/key.h>
Adrian Bunkb6cd0b72006-06-27 02:53:54 -070061#include <linux/buffer_head.h>
Joonsoo Kimeefa864b2014-12-12 16:55:46 -080062#include <linux/page_ext.h>
Ingo Molnar9a11b49a2006-07-03 00:24:33 -070063#include <linux/debug_locks.h>
Thomas Gleixner3ac7fe52008-04-30 00:55:01 -070064#include <linux/debugobjects.h>
Ingo Molnarfbb9ce952006-07-03 00:24:50 -070065#include <linux/lockdep.h>
Catalin Marinas3c7b4e62009-06-11 13:22:39 +010066#include <linux/kmemleak.h>
Daniel Jordanf1b192b2020-06-03 15:59:35 -070067#include <linux/padata.h>
Sukadev Bhattiprolu84d73782006-12-08 02:38:01 -080068#include <linux/pid_namespace.h>
Greg Kroah-Hartman4c002c92019-12-09 20:33:03 +010069#include <linux/device/driver.h>
Eric W. Biederman73c27992007-05-09 02:34:32 -070070#include <linux/kthread.h>
Adrian Bunke6fe6642007-11-09 22:39:39 +010071#include <linux/sched.h>
Ingo Molnar1777e462017-02-05 14:47:12 +010072#include <linux/sched/init.h>
Adrian Bunka1c9eea2008-02-06 01:36:44 -080073#include <linux/signal.h>
Akinobu Mita199f0ca2008-04-29 01:03:13 -070074#include <linux/idr.h>
Jason Wessel0b4b3822010-05-20 21:04:29 -050075#include <linux/kgdb.h>
Steven Rostedt68bf21a2008-08-14 15:45:08 -040076#include <linux/ftrace.h>
Arjan van de Ven22a9d642009-01-07 08:45:46 -080077#include <linux/async.h>
Feng Tang6ae69962009-08-14 15:13:46 -040078#include <linux/sfi.h>
Kay Sievers2b2af542009-04-30 15:23:42 +020079#include <linux/shmem_fs.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090080#include <linux/slab.h>
Peter Zijlstra24a24bb2010-11-17 23:17:33 +010081#include <linux/perf_event.h>
Al Viroa74fb732012-10-10 21:28:25 -040082#include <linux/ptrace.h>
Thomas Gleixneraa8c6242017-12-04 15:07:36 +010083#include <linux/pti.h>
Tejun Heobb813f42013-01-18 14:05:56 -080084#include <linux/blkdev.h>
85#include <linux/elevator.h>
Pavel Tatashin5d2a4e92018-07-19 16:55:41 -040086#include <linux/sched/clock.h>
Ingo Molnar29930022017-02-08 18:51:36 +010087#include <linux/sched/task.h>
Ingo Molnar68db0cf2017-02-08 18:51:37 +010088#include <linux/sched/task_stack.h>
Frederic Weisbecker65f382f2013-07-11 19:12:32 +020089#include <linux/context_tracking.h>
Theodore Ts'o47d06e52013-09-10 10:52:35 -040090#include <linux/random.h>
Prarit Bhargava7b0b73d2014-06-04 16:12:17 -070091#include <linux/list.h>
Dmitry Kasatkinc9cd2ce2014-11-05 17:01:15 +020092#include <linux/integrity.h>
Al Viroe149ed22014-11-01 10:57:28 -040093#include <linux/proc_ns.h>
Toshi Kani0ddab1d2015-04-14 15:47:20 -070094#include <linux/io.h>
AKASHI Takahiro39290b32016-11-14 15:15:05 +090095#include <linux/cache.h>
Jinbum Park2959a5f2017-02-27 14:30:22 -080096#include <linux/rodata_test.h>
Josh Poimboeuf33352242018-02-20 11:37:51 -060097#include <linux/jump_label.h>
Marco Elverdfd402a2019-11-14 19:02:54 +010098#include <linux/kcsan.h>
Christoph Hellwigeb9d7d32020-07-22 11:14:02 +020099#include <linux/init_syscalls.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100
101#include <asm/io.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102#include <asm/setup.h>
Andi Kleena9401992005-07-28 21:15:30 -0700103#include <asm/sections.h>
Arjan van de Ven37b73c82006-01-06 00:12:01 -0800104#include <asm/cacheflush.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105
Steven Rostedt (VMware)4ee7c602018-03-23 10:18:03 -0400106#define CREATE_TRACE_POINTS
107#include <trace/events/initcall.h>
108
Brendan Higgins8c0d8842020-08-04 13:47:43 -0700109#include <kunit/test.h>
110
Sam Ravnborgaae5f662007-02-26 16:45:41 +0100111static int kernel_init(void *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112
113extern void init_IRQ(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114extern void radix_tree_init(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115
Tejun Heo2ce802f2011-01-20 12:06:35 +0100116/*
117 * Debug helper: via this flag we know that we are in 'early bootup code'
118 * where only the boot processor is running with IRQ disabled. This means
119 * two things - IRQ must not be enabled before the flag is cleared and some
120 * operations which are not allowed with IRQ disabled are allowed while the
121 * flag is set.
122 */
123bool early_boot_irqs_disabled __read_mostly;
124
Paul E. McKenneya6826042009-02-25 18:03:42 -0800125enum system_states system_state __read_mostly;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126EXPORT_SYMBOL(system_state);
127
128/*
129 * Boot command-line arguments
130 */
131#define MAX_INIT_ARGS CONFIG_INIT_ENV_ARG_LIMIT
132#define MAX_INIT_ENVS CONFIG_INIT_ENV_ARG_LIMIT
133
134extern void time_init(void);
135/* Default late time init is NULL. archs can override this later. */
Jan Beulichd2e31922009-01-06 14:41:10 -0800136void (*__initdata late_time_init)(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137
Alon Bar-Lev30d7e0d2007-02-12 00:53:52 -0800138/* Untouched command line saved by arch-specific code. */
139char __initdata boot_command_line[COMMAND_LINE_SIZE];
140/* Untouched saved command line (eg. for /proc) */
141char *saved_command_line;
142/* Command line for parameter parsing */
143static char *static_command_line;
Masami Hiramatsu51887d02020-01-11 01:04:43 +0900144/* Untouched extra command line */
145static char *extra_command_line;
Masami Hiramatsu1319916202020-01-11 01:04:55 +0900146/* Extra init arguments */
147static char *extra_init_args;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148
Steven Rostedt (VMware)f61872b2020-02-07 19:07:37 -0500149#ifdef CONFIG_BOOT_CONFIG
150/* Is bootconfig on command line? */
151static bool bootconfig_found;
152static bool initargs_found;
153#else
154# define bootconfig_found false
155# define initargs_found false
156#endif
157
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158static char *execute_command;
Christoph Hellwig916db732020-06-07 09:06:29 +0200159static char *ramdisk_execute_command = "/init";
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160
Jan Beulich8b3b2952007-07-15 23:41:07 -0700161/*
Hannes Frederic Sowac4b2c0c2013-10-19 21:48:53 +0200162 * Used to generate warnings if static_key manipulation functions are used
163 * before jump_label_init is called.
164 */
Fabian Frederickdd4d9fe2014-08-08 14:23:44 -0700165bool static_key_initialized __read_mostly;
Hannes Frederic Sowac4b2c0c2013-10-19 21:48:53 +0200166EXPORT_SYMBOL_GPL(static_key_initialized);
167
168/*
Jan Beulich8b3b2952007-07-15 23:41:07 -0700169 * If set, this is an indication to the drivers that reset the underlying
170 * device before going ahead with the initialization otherwise driver might
171 * rely on the BIOS and skip the reset operation.
172 *
173 * This is useful if kernel is booting in an unreliable environment.
Frans Klaverfc454fd2015-02-23 22:05:56 +0100174 * For ex. kdump situation where previous kernel has crashed, BIOS has been
Jan Beulich8b3b2952007-07-15 23:41:07 -0700175 * skipped and devices will be in unknown state.
176 */
177unsigned int reset_devices;
178EXPORT_SYMBOL(reset_devices);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179
Vivek Goyal7e962872006-09-27 01:50:44 -0700180static int __init set_reset_devices(char *str)
181{
182 reset_devices = 1;
183 return 1;
184}
185
186__setup("reset_devices", set_reset_devices);
187
Fabian Frederickdd4d9fe2014-08-08 14:23:44 -0700188static const char *argv_init[MAX_INIT_ARGS+2] = { "init", NULL, };
189const char *envp_init[MAX_INIT_ENVS+2] = { "HOME=/", "TERM=linux", NULL, };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190static const char *panic_later, *panic_param;
191
Rusty Russell914dcaa2010-08-11 23:04:18 -0600192extern const struct obs_kernel_param __setup_start[], __setup_end[];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193
Yaowei Bai31c025b2016-01-20 14:59:27 -0800194static bool __init obsolete_checksetup(char *line)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195{
Rusty Russell914dcaa2010-08-11 23:04:18 -0600196 const struct obs_kernel_param *p;
Yaowei Bai31c025b2016-01-20 14:59:27 -0800197 bool had_early_param = false;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198
199 p = __setup_start;
200 do {
201 int n = strlen(p->str);
Michal Schmidtb1e4d202011-10-10 00:03:37 +0200202 if (parameqn(line, p->str, n)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203 if (p->early) {
Rusty Russell33df0d12006-09-26 10:52:32 +0200204 /* Already done in parse_early_param?
205 * (Needs exact match on param part).
206 * Keep iterating, as we can have early
207 * params and __setups of same names 8( */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208 if (line[n] == '\0' || line[n] == '=')
Yaowei Bai31c025b2016-01-20 14:59:27 -0800209 had_early_param = true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210 } else if (!p->setup_func) {
Andrew Mortonea676e82013-04-29 16:18:20 -0700211 pr_warn("Parameter %s is obsolete, ignored\n",
212 p->str);
Yaowei Bai31c025b2016-01-20 14:59:27 -0800213 return true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214 } else if (p->setup_func(line + n))
Yaowei Bai31c025b2016-01-20 14:59:27 -0800215 return true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700216 }
217 p++;
218 } while (p < __setup_end);
Rusty Russell33df0d12006-09-26 10:52:32 +0200219
220 return had_early_param;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221}
222
223/*
224 * This should be approx 2 Bo*oMips to start (note initial shift), and will
225 * still work even if initially too large, it will just take slightly longer
226 */
227unsigned long loops_per_jiffy = (1<<12);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228EXPORT_SYMBOL(loops_per_jiffy);
229
230static int __init debug_kernel(char *str)
231{
Borislav Petkova8fe19e2014-06-04 16:11:46 -0700232 console_loglevel = CONSOLE_LOGLEVEL_DEBUG;
Yinghai Luf6f21c812008-02-08 04:21:58 -0800233 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234}
235
236static int __init quiet_kernel(char *str)
237{
Borislav Petkova8fe19e2014-06-04 16:11:46 -0700238 console_loglevel = CONSOLE_LOGLEVEL_QUIET;
Yinghai Luf6f21c812008-02-08 04:21:58 -0800239 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240}
241
Yinghai Luf6f21c812008-02-08 04:21:58 -0800242early_param("debug", debug_kernel);
243early_param("quiet", quiet_kernel);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244
245static int __init loglevel(char *str)
246{
Alexander Sverdlin808bf292011-09-21 09:51:40 +0200247 int newlevel;
248
249 /*
250 * Only update loglevel value when a correct setting was passed,
251 * to prevent blind crashes (when loglevel being set to 0) that
252 * are quite hard to debug
253 */
254 if (get_option(&str, &newlevel)) {
255 console_loglevel = newlevel;
256 return 0;
257 }
258
259 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700260}
261
Yinghai Luf6f21c812008-02-08 04:21:58 -0800262early_param("loglevel", loglevel);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263
Masami Hiramatsude462e52020-04-26 15:53:30 +0900264#ifdef CONFIG_BLK_DEV_INITRD
265static void * __init get_boot_config_from_initrd(u32 *_size, u32 *_csum)
266{
267 u32 size, csum;
268 char *data;
269 u32 *hdr;
Masami Hiramatsu50b8a742020-11-13 02:27:31 +0900270 int i;
Masami Hiramatsude462e52020-04-26 15:53:30 +0900271
272 if (!initrd_end)
273 return NULL;
274
275 data = (char *)initrd_end - BOOTCONFIG_MAGIC_LEN;
Masami Hiramatsu50b8a742020-11-13 02:27:31 +0900276 /*
277 * Since Grub may align the size of initrd to 4, we must
278 * check the preceding 3 bytes as well.
279 */
280 for (i = 0; i < 4; i++) {
281 if (!memcmp(data, BOOTCONFIG_MAGIC, BOOTCONFIG_MAGIC_LEN))
282 goto found;
283 data--;
284 }
285 return NULL;
Masami Hiramatsude462e52020-04-26 15:53:30 +0900286
Masami Hiramatsu50b8a742020-11-13 02:27:31 +0900287found:
Masami Hiramatsude462e52020-04-26 15:53:30 +0900288 hdr = (u32 *)(data - 8);
Masami Hiramatsu24aed092020-11-20 11:29:04 +0900289 size = le32_to_cpu(hdr[0]);
290 csum = le32_to_cpu(hdr[1]);
Masami Hiramatsude462e52020-04-26 15:53:30 +0900291
292 data = ((void *)hdr) - size;
293 if ((unsigned long)data < initrd_start) {
294 pr_err("bootconfig size %d is greater than initrd size %ld\n",
295 size, initrd_end - initrd_start);
296 return NULL;
297 }
298
299 /* Remove bootconfig from initramfs/initrd */
300 initrd_end = (unsigned long)data;
301 if (_size)
302 *_size = size;
303 if (_csum)
304 *_csum = csum;
305
306 return data;
307}
308#else
309static void * __init get_boot_config_from_initrd(u32 *_size, u32 *_csum)
310{
311 return NULL;
312}
313#endif
314
Masami Hiramatsu7684b852020-01-11 01:03:44 +0900315#ifdef CONFIG_BOOT_CONFIG
Masami Hiramatsu51887d02020-01-11 01:04:43 +0900316
Jason Yana27026e2020-09-15 15:03:24 +0800317static char xbc_namebuf[XBC_KEYLEN_MAX] __initdata;
Masami Hiramatsu51887d02020-01-11 01:04:43 +0900318
319#define rest(dst, end) ((end) > (dst) ? (end) - (dst) : 0)
320
321static int __init xbc_snprint_cmdline(char *buf, size_t size,
322 struct xbc_node *root)
323{
324 struct xbc_node *knode, *vnode;
325 char *end = buf + size;
Masami Hiramatsu51887d02020-01-11 01:04:43 +0900326 const char *val;
327 int ret;
328
329 xbc_node_for_each_key_value(root, knode, val) {
330 ret = xbc_node_compose_key_after(root, knode,
331 xbc_namebuf, XBC_KEYLEN_MAX);
332 if (ret < 0)
333 return ret;
334
335 vnode = xbc_node_get_child(knode);
Masami Hiramatsu88b91372020-02-20 21:19:42 +0900336 if (!vnode) {
337 ret = snprintf(buf, rest(buf, end), "%s ", xbc_namebuf);
Masami Hiramatsu51887d02020-01-11 01:04:43 +0900338 if (ret < 0)
339 return ret;
340 buf += ret;
Masami Hiramatsu88b91372020-02-20 21:19:42 +0900341 continue;
Masami Hiramatsu51887d02020-01-11 01:04:43 +0900342 }
Masami Hiramatsu88b91372020-02-20 21:19:42 +0900343 xbc_array_for_each_value(vnode, val) {
344 ret = snprintf(buf, rest(buf, end), "%s=\"%s\" ",
345 xbc_namebuf, val);
346 if (ret < 0)
347 return ret;
348 buf += ret;
349 }
Masami Hiramatsu51887d02020-01-11 01:04:43 +0900350 }
351
352 return buf - (end - size);
353}
354#undef rest
355
356/* Make an extra command line under given key word */
357static char * __init xbc_make_cmdline(const char *key)
358{
359 struct xbc_node *root;
360 char *new_cmdline;
361 int ret, len = 0;
362
363 root = xbc_find_node(key);
364 if (!root)
365 return NULL;
366
367 /* Count required buffer size */
368 len = xbc_snprint_cmdline(NULL, 0, root);
369 if (len <= 0)
370 return NULL;
371
372 new_cmdline = memblock_alloc(len + 1, SMP_CACHE_BYTES);
373 if (!new_cmdline) {
374 pr_err("Failed to allocate memory for extra kernel cmdline.\n");
375 return NULL;
376 }
377
378 ret = xbc_snprint_cmdline(new_cmdline, len + 1, root);
379 if (ret < 0 || ret > len) {
380 pr_err("Failed to print extra kernel cmdline.\n");
Masami Hiramatsuf27060e2021-09-16 15:23:12 +0900381 memblock_free(__pa(new_cmdline), len + 1);
Masami Hiramatsu51887d02020-01-11 01:04:43 +0900382 return NULL;
383 }
384
385 return new_cmdline;
386}
387
Qiujun Huang08d9e682020-02-16 19:28:31 +0800388static u32 boot_config_checksum(unsigned char *p, u32 size)
Masami Hiramatsu7684b852020-01-11 01:03:44 +0900389{
390 u32 ret = 0;
391
392 while (size--)
393 ret += *p++;
394
395 return ret;
396}
397
Steven Rostedt (VMware)f61872b2020-02-07 19:07:37 -0500398static int __init bootconfig_params(char *param, char *val,
399 const char *unused, void *arg)
400{
401 if (strcmp(param, "bootconfig") == 0) {
402 bootconfig_found = true;
Steven Rostedt (VMware)f61872b2020-02-07 19:07:37 -0500403 }
404 return 0;
405}
406
Steven Rostedt (VMware)7495e092020-02-04 07:33:53 -0500407static void __init setup_boot_config(const char *cmdline)
Masami Hiramatsu7684b852020-01-11 01:03:44 +0900408{
Steven Rostedt (VMware)f61872b2020-02-07 19:07:37 -0500409 static char tmp_cmdline[COMMAND_LINE_SIZE] __initdata;
Masami Hiramatsu89b74ca2020-03-03 20:24:50 +0900410 const char *msg;
411 int pos;
Masami Hiramatsu7684b852020-01-11 01:03:44 +0900412 u32 size, csum;
Masami Hiramatsu477d0842020-08-04 11:52:13 +0900413 char *data, *copy, *err;
Masami Hiramatsua0057402020-02-05 22:50:23 +0900414 int ret;
Masami Hiramatsu7684b852020-01-11 01:03:44 +0900415
Masami Hiramatsu611d0a92020-05-11 10:39:24 +0900416 /* Cut out the bootconfig data even if we have no bootconfig option */
Masami Hiramatsude462e52020-04-26 15:53:30 +0900417 data = get_boot_config_from_initrd(&size, &csum);
Masami Hiramatsude462e52020-04-26 15:53:30 +0900418
Steven Rostedt (VMware)f61872b2020-02-07 19:07:37 -0500419 strlcpy(tmp_cmdline, boot_command_line, COMMAND_LINE_SIZE);
Masami Hiramatsu477d0842020-08-04 11:52:13 +0900420 err = parse_args("bootconfig", tmp_cmdline, NULL, 0, 0, 0, NULL,
421 bootconfig_params);
Steven Rostedt (VMware)f61872b2020-02-07 19:07:37 -0500422
Masami Hiramatsu477d0842020-08-04 11:52:13 +0900423 if (IS_ERR(err) || !bootconfig_found)
Masami Hiramatsu7684b852020-01-11 01:03:44 +0900424 return;
425
Masami Hiramatsu477d0842020-08-04 11:52:13 +0900426 /* parse_args() stops at '--' and returns an address */
427 if (err)
428 initargs_found = true;
429
Masami Hiramatsu611d0a92020-05-11 10:39:24 +0900430 if (!data) {
431 pr_err("'bootconfig' found on command line, but no bootconfig found\n");
432 return;
433 }
434
Steven Rostedt (VMware)7495e092020-02-04 07:33:53 -0500435 if (size >= XBC_DATA_MAX) {
436 pr_err("bootconfig size %d greater than max size %d\n",
437 size, XBC_DATA_MAX);
Masami Hiramatsu7684b852020-01-11 01:03:44 +0900438 return;
Steven Rostedt (VMware)7495e092020-02-04 07:33:53 -0500439 }
Masami Hiramatsu7684b852020-01-11 01:03:44 +0900440
Steven Rostedt (VMware)7495e092020-02-04 07:33:53 -0500441 if (boot_config_checksum((unsigned char *)data, size) != csum) {
442 pr_err("bootconfig checksum failed\n");
Masami Hiramatsu7684b852020-01-11 01:03:44 +0900443 return;
Steven Rostedt (VMware)7495e092020-02-04 07:33:53 -0500444 }
Masami Hiramatsu7684b852020-01-11 01:03:44 +0900445
446 copy = memblock_alloc(size + 1, SMP_CACHE_BYTES);
447 if (!copy) {
Masami Hiramatsue241d142020-02-05 22:49:54 +0900448 pr_err("Failed to allocate memory for bootconfig\n");
Masami Hiramatsu7684b852020-01-11 01:03:44 +0900449 return;
450 }
451
452 memcpy(copy, data, size);
453 copy[size] = '\0';
454
Masami Hiramatsu89b74ca2020-03-03 20:24:50 +0900455 ret = xbc_init(copy, &msg, &pos);
456 if (ret < 0) {
457 if (pos < 0)
458 pr_err("Failed to init bootconfig: %s.\n", msg);
459 else
460 pr_err("Failed to parse bootconfig: %s at %d.\n",
461 msg, pos);
462 } else {
Masami Hiramatsua0057402020-02-05 22:50:23 +0900463 pr_info("Load bootconfig: %d bytes %d nodes\n", size, ret);
Masami Hiramatsu51887d02020-01-11 01:04:43 +0900464 /* keys starting with "kernel." are passed via cmdline */
465 extra_command_line = xbc_make_cmdline("kernel");
Masami Hiramatsu1319916202020-01-11 01:04:55 +0900466 /* Also, "init." keys are init arguments */
467 extra_init_args = xbc_make_cmdline("init");
Masami Hiramatsu51887d02020-01-11 01:04:43 +0900468 }
Steven Rostedt (VMware)7495e092020-02-04 07:33:53 -0500469 return;
Masami Hiramatsu7684b852020-01-11 01:03:44 +0900470}
Masami Hiramatsude462e52020-04-26 15:53:30 +0900471
Masami Hiramatsu7684b852020-01-11 01:03:44 +0900472#else
Masami Hiramatsude462e52020-04-26 15:53:30 +0900473
474static void __init setup_boot_config(const char *cmdline)
475{
476 /* Remove bootconfig data from initrd */
477 get_boot_config_from_initrd(NULL, NULL);
478}
Masami Hiramatsud8a953d2020-02-20 21:18:33 +0900479
480static int __init warn_bootconfig(char *str)
481{
Shaokun Zhang36c6aa22020-05-09 16:33:55 +0800482 pr_warn("WARNING: 'bootconfig' found on the kernel command line but CONFIG_BOOT_CONFIG is not set.\n");
Masami Hiramatsud8a953d2020-02-20 21:18:33 +0900483 return 0;
484}
485early_param("bootconfig", warn_bootconfig);
486
Masami Hiramatsu7684b852020-01-11 01:03:44 +0900487#endif
488
Chris Metcalfa99cd112012-04-06 12:53:50 -0400489/* Change NUL term back to "=", to make "param" the whole string. */
Arvind Sankar7e2762e2020-01-30 22:17:16 -0800490static void __init repair_env_string(char *param, char *val)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700491{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700492 if (val) {
493 /* param=val or param="val"? */
494 if (val == param+strlen(param)+1)
495 val[-1] = '=';
496 else if (val == param+strlen(param)+2) {
497 val[-2] = '=';
498 memmove(val-1, val, strlen(val)+1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700499 } else
500 BUG();
501 }
Chris Metcalfa99cd112012-04-06 12:53:50 -0400502}
503
Rusty Russell51e158c2014-04-28 11:34:33 +0930504/* Anything after -- gets handed straight to init. */
Luis R. Rodriguezecc86172015-03-30 16:20:03 -0700505static int __init set_init_arg(char *param, char *val,
506 const char *unused, void *arg)
Rusty Russell51e158c2014-04-28 11:34:33 +0930507{
508 unsigned int i;
509
510 if (panic_later)
511 return 0;
512
Arvind Sankar7e2762e2020-01-30 22:17:16 -0800513 repair_env_string(param, val);
Rusty Russell51e158c2014-04-28 11:34:33 +0930514
515 for (i = 0; argv_init[i]; i++) {
516 if (i == MAX_INIT_ARGS) {
517 panic_later = "init";
518 panic_param = param;
519 return 0;
520 }
521 }
522 argv_init[i] = param;
523 return 0;
524}
525
Chris Metcalfa99cd112012-04-06 12:53:50 -0400526/*
527 * Unknown boot options get handed to init, unless they look like
528 * unused parameters (modprobe will find them in /proc/cmdline).
529 */
Luis R. Rodriguezecc86172015-03-30 16:20:03 -0700530static int __init unknown_bootoption(char *param, char *val,
531 const char *unused, void *arg)
Chris Metcalfa99cd112012-04-06 12:53:50 -0400532{
Arvind Sankar283900e2020-01-30 22:17:19 -0800533 size_t len = strlen(param);
534
Arvind Sankar7e2762e2020-01-30 22:17:16 -0800535 repair_env_string(param, val);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700536
537 /* Handle obsolete-style parameters */
538 if (obsolete_checksetup(param))
539 return 0;
540
Rusty Russellf066a4f2009-12-01 14:56:44 +1030541 /* Unused module parameter. */
Arvind Sankar283900e2020-01-30 22:17:19 -0800542 if (strnchr(param, len, '.'))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700543 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700544
545 if (panic_later)
546 return 0;
547
548 if (val) {
549 /* Environment option */
550 unsigned int i;
551 for (i = 0; envp_init[i]; i++) {
552 if (i == MAX_INIT_ENVS) {
Tetsuo Handa499a4582014-01-23 15:54:56 -0800553 panic_later = "env";
Linus Torvalds1da177e2005-04-16 15:20:36 -0700554 panic_param = param;
555 }
Arvind Sankar283900e2020-01-30 22:17:19 -0800556 if (!strncmp(param, envp_init[i], len+1))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700557 break;
558 }
559 envp_init[i] = param;
560 } else {
561 /* Command line option */
562 unsigned int i;
563 for (i = 0; argv_init[i]; i++) {
564 if (i == MAX_INIT_ARGS) {
Tetsuo Handa499a4582014-01-23 15:54:56 -0800565 panic_later = "init";
Linus Torvalds1da177e2005-04-16 15:20:36 -0700566 panic_param = param;
567 }
568 }
569 argv_init[i] = param;
570 }
571 return 0;
572}
573
574static int __init init_setup(char *str)
575{
576 unsigned int i;
577
578 execute_command = str;
579 /*
580 * In case LILO is going to boot us with default command line,
581 * it prepends "auto" before the whole cmdline which makes
582 * the shell think it should execute a script with such name.
583 * So we ignore all arguments entered _before_ init=... [MJ]
584 */
585 for (i = 1; i < MAX_INIT_ARGS; i++)
586 argv_init[i] = NULL;
587 return 1;
588}
589__setup("init=", init_setup);
590
Olof Johanssonffdfc402005-09-06 15:17:19 -0700591static int __init rdinit_setup(char *str)
592{
593 unsigned int i;
594
595 ramdisk_execute_command = str;
596 /* See "auto" comment in init_setup */
597 for (i = 1; i < MAX_INIT_ARGS; i++)
598 argv_init[i] = NULL;
599 return 1;
600}
601__setup("rdinit=", rdinit_setup);
602
Linus Torvalds1da177e2005-04-16 15:20:36 -0700603#ifndef CONFIG_SMP
Amerigo Wang34db18a02011-03-22 16:34:06 -0700604static const unsigned int setup_max_cpus = NR_CPUS;
Mike Travise0982e92008-03-26 14:23:48 -0700605static inline void setup_nr_cpu_ids(void) { }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700606static inline void smp_prepare_cpus(unsigned int maxcpus) { }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700607#endif
608
609/*
Alon Bar-Lev30d7e0d2007-02-12 00:53:52 -0800610 * We need to store the untouched command line for future reference.
611 * We also need to store the touched command line since the parameter
612 * parsing is performed in place, and we should allow a component to
613 * store reference of name/value for future reference.
614 */
615static void __init setup_command_line(char *command_line)
616{
Masami Hiramatsu1319916202020-01-11 01:04:55 +0900617 size_t len, xlen = 0, ilen = 0;
Mike Rapoportf5c73102019-03-11 23:30:20 -0700618
Masami Hiramatsu51887d02020-01-11 01:04:43 +0900619 if (extra_command_line)
620 xlen = strlen(extra_command_line);
Masami Hiramatsu1319916202020-01-11 01:04:55 +0900621 if (extra_init_args)
622 ilen = strlen(extra_init_args) + 4; /* for " -- " */
Masami Hiramatsu51887d02020-01-11 01:04:43 +0900623
624 len = xlen + strlen(boot_command_line) + 1;
Mike Rapoportf5c73102019-03-11 23:30:20 -0700625
Masami Hiramatsu1319916202020-01-11 01:04:55 +0900626 saved_command_line = memblock_alloc(len + ilen, SMP_CACHE_BYTES);
Mike Rapoportf5c73102019-03-11 23:30:20 -0700627 if (!saved_command_line)
Masami Hiramatsu1319916202020-01-11 01:04:55 +0900628 panic("%s: Failed to allocate %zu bytes\n", __func__, len + ilen);
Mike Rapoportf5c73102019-03-11 23:30:20 -0700629
630 static_command_line = memblock_alloc(len, SMP_CACHE_BYTES);
631 if (!static_command_line)
632 panic("%s: Failed to allocate %zu bytes\n", __func__, len);
633
Masami Hiramatsu51887d02020-01-11 01:04:43 +0900634 if (xlen) {
635 /*
636 * We have to put extra_command_line before boot command
637 * lines because there could be dashes (separator of init
638 * command line) in the command lines.
639 */
640 strcpy(saved_command_line, extra_command_line);
641 strcpy(static_command_line, extra_command_line);
642 }
643 strcpy(saved_command_line + xlen, boot_command_line);
644 strcpy(static_command_line + xlen, command_line);
Masami Hiramatsu1319916202020-01-11 01:04:55 +0900645
646 if (ilen) {
647 /*
648 * Append supplemental init boot args to saved_command_line
649 * so that user can check what command line options passed
650 * to init.
651 */
652 len = strlen(saved_command_line);
Steven Rostedt (VMware)f61872b2020-02-07 19:07:37 -0500653 if (initargs_found) {
654 saved_command_line[len++] = ' ';
655 } else {
Masami Hiramatsu1319916202020-01-11 01:04:55 +0900656 strcpy(saved_command_line + len, " -- ");
657 len += 4;
Steven Rostedt (VMware)f61872b2020-02-07 19:07:37 -0500658 }
Masami Hiramatsu1319916202020-01-11 01:04:55 +0900659
660 strcpy(saved_command_line + len, extra_init_args);
661 }
Alon Bar-Lev30d7e0d2007-02-12 00:53:52 -0800662}
663
664/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700665 * We need to finalize in a non-__init function or else race conditions
666 * between the root thread and the init thread may cause start_kernel to
667 * be reaped by free_initmem before the root thread has proceeded to
668 * cpu_idle.
669 *
670 * gcc-3.4 accidentally inlines this function, so use noinline.
671 */
672
Peter Zijlstrab433c3d2010-06-28 16:51:01 +0200673static __initdata DECLARE_COMPLETION(kthreadd_done);
674
Martin Schwidefsky53c99bd62018-08-31 10:42:24 +0200675noinline void __ref rest_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700676{
Thomas Gleixner8fb12152017-05-16 20:42:32 +0200677 struct task_struct *tsk;
Eric W. Biederman73c27992007-05-09 02:34:32 -0700678 int pid;
679
Paul E. McKenney7db905e2009-09-02 14:01:24 -0700680 rcu_scheduler_starting();
Peter Zijlstrab433c3d2010-06-28 16:51:01 +0200681 /*
Peter Zijlstra97158562010-06-30 10:37:11 +0200682 * We need to spawn init first so that it obtains pid 1, however
Peter Zijlstrab433c3d2010-06-28 16:51:01 +0200683 * the init task will end up wanting to create kthreads, which, if
684 * we schedule it before we create kthreadd, will OOPS.
685 */
Thomas Gleixner8fb12152017-05-16 20:42:32 +0200686 pid = kernel_thread(kernel_init, NULL, CLONE_FS);
687 /*
688 * Pin init on the boot CPU. Task migration is not properly working
689 * until sched_init_smp() has been run. It will set the allowed
690 * CPUs for init to the non isolated CPUs.
691 */
692 rcu_read_lock();
693 tsk = find_task_by_pid_ns(pid, &init_pid_ns);
694 set_cpus_allowed_ptr(tsk, cpumask_of(smp_processor_id()));
695 rcu_read_unlock();
696
Linus Torvalds1da177e2005-04-16 15:20:36 -0700697 numa_default_policy();
Eric W. Biederman73c27992007-05-09 02:34:32 -0700698 pid = kernel_thread(kthreadd, NULL, CLONE_FS | CLONE_FILES);
Paul E. McKenneyd11c5632010-02-22 17:04:50 -0800699 rcu_read_lock();
Pavel Emelyanov5cd20452008-04-30 00:54:24 -0700700 kthreadd_task = find_task_by_pid_ns(pid, &init_pid_ns);
Paul E. McKenneyd11c5632010-02-22 17:04:50 -0800701 rcu_read_unlock();
Thomas Gleixner1c3c5ea2017-05-16 20:42:48 +0200702
703 /*
704 * Enable might_sleep() and smp_processor_id() checks.
Thomas Gleixnerc1a280b2019-07-26 23:19:37 +0200705 * They cannot be enabled earlier because with CONFIG_PREEMPTION=y
Thomas Gleixner1c3c5ea2017-05-16 20:42:48 +0200706 * kernel_thread() would trigger might_sleep() splats. With
707 * CONFIG_PREEMPT_VOLUNTARY=y the init task might have scheduled
708 * already, but it's stuck on the kthreadd_done completion.
709 */
710 system_state = SYSTEM_SCHEDULING;
711
Peter Zijlstrab433c3d2010-06-28 16:51:01 +0200712 complete(&kthreadd_done);
Ingo Molnarf340c0d2005-06-28 16:40:42 +0200713
714 /*
715 * The boot idle thread must execute schedule()
Ingo Molnar1df21052007-07-09 18:51:58 +0200716 * at least once to get things moving:
Ingo Molnarf340c0d2005-06-28 16:40:42 +0200717 */
Thomas Gleixnerbd2f5532011-03-21 12:33:18 +0100718 schedule_preempt_disabled();
Nick Piggin5bfb5d62005-11-08 21:39:01 -0800719 /* Call into cpu_idle with preempt disabled */
Thomas Gleixnera1a04ec2013-03-21 22:49:34 +0100720 cpu_startup_entry(CPUHP_ONLINE);
Ingo Molnar1df21052007-07-09 18:51:58 +0200721}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700722
723/* Check for early params. */
Luis R. Rodriguezecc86172015-03-30 16:20:03 -0700724static int __init do_early_param(char *param, char *val,
725 const char *unused, void *arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700726{
Rusty Russell914dcaa2010-08-11 23:04:18 -0600727 const struct obs_kernel_param *p;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700728
729 for (p = __setup_start; p < __setup_end; p++) {
Michal Schmidtb1e4d202011-10-10 00:03:37 +0200730 if ((p->early && parameq(param, p->str)) ||
Yinghai Lu18a8bd92007-07-15 23:37:59 -0700731 (strcmp(param, "console") == 0 &&
732 strcmp(p->str, "earlycon") == 0)
733 ) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700734 if (p->setup_func(val) != 0)
Andrew Mortonea676e82013-04-29 16:18:20 -0700735 pr_warn("Malformed early option '%s'\n", param);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700736 }
737 }
738 /* We accept everything at this stage. */
739 return 0;
740}
741
Magnus Damm13977092009-03-30 14:37:25 -0700742void __init parse_early_options(char *cmdline)
743{
Luis R. Rodriguezecc86172015-03-30 16:20:03 -0700744 parse_args("early options", cmdline, NULL, 0, 0, 0, NULL,
745 do_early_param);
Magnus Damm13977092009-03-30 14:37:25 -0700746}
747
Linus Torvalds1da177e2005-04-16 15:20:36 -0700748/* Arch code calls this early on, or if not, just before other parsing. */
749void __init parse_early_param(void)
750{
Fabian Frederickdd4d9fe2014-08-08 14:23:44 -0700751 static int done __initdata;
752 static char tmp_cmdline[COMMAND_LINE_SIZE] __initdata;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700753
754 if (done)
755 return;
756
757 /* All fall through to do_early_param. */
Alon Bar-Lev30d7e0d2007-02-12 00:53:52 -0800758 strlcpy(tmp_cmdline, boot_command_line, COMMAND_LINE_SIZE);
Magnus Damm13977092009-03-30 14:37:25 -0700759 parse_early_options(tmp_cmdline);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700760 done = 1;
761}
762
Thomas Gleixnere7ff3a42016-12-09 19:29:10 +0100763void __init __weak arch_post_acpi_subsys_init(void) { }
764
Benjamin Herrenschmidt839ad622008-04-18 16:56:18 +1000765void __init __weak smp_setup_processor_id(void)
Andrew Morton033ab7f2006-06-30 01:55:50 -0700766{
767}
768
David Howellseded09c2012-11-02 13:20:42 +0000769# if THREAD_SIZE >= PAGE_SIZE
Linus Torvaldsb235bee2016-06-24 15:09:37 -0700770void __init __weak thread_stack_cache_init(void)
Benjamin Herrenschmidt8c9843e2008-04-18 16:56:15 +1000771{
772}
David Howellseded09c2012-11-02 13:20:42 +0000773#endif
Benjamin Herrenschmidt8c9843e2008-04-18 16:56:15 +1000774
Nadav Amit4fc19702019-04-26 16:22:46 -0700775void __init __weak poking_init(void) { }
776
Mike Rapoport782de702019-09-23 15:35:31 -0700777void __init __weak pgtable_cache_init(void) { }
Nadav Amitcaa84132019-05-04 18:11:24 -0700778
Steven Rostedt (VMware)4e379582018-03-26 13:31:07 -0400779bool initcall_debug;
780core_param(initcall_debug, initcall_debug, bool, 0644);
Steven Rostedt (VMware)b0dc52f2018-04-06 09:24:25 -0400781
782#ifdef TRACEPOINTS_ENABLED
Steven Rostedt (VMware)4e379582018-03-26 13:31:07 -0400783static void __init initcall_debug_enable(void);
Steven Rostedt (VMware)b0dc52f2018-04-06 09:24:25 -0400784#else
785static inline void initcall_debug_enable(void)
786{
787}
788#endif
Steven Rostedt (VMware)4e379582018-03-26 13:31:07 -0400789
Alexander Potapenko23a5c8c2019-07-11 20:59:23 -0700790/* Report memory auto-initialization states for this boot. */
791static void __init report_meminit(void)
792{
793 const char *stack;
794
glider@google.comf0fe00d2020-06-16 10:34:35 +0200795 if (IS_ENABLED(CONFIG_INIT_STACK_ALL_PATTERN))
796 stack = "all(pattern)";
797 else if (IS_ENABLED(CONFIG_INIT_STACK_ALL_ZERO))
798 stack = "all(zero)";
Alexander Potapenko23a5c8c2019-07-11 20:59:23 -0700799 else if (IS_ENABLED(CONFIG_GCC_PLUGIN_STRUCTLEAK_BYREF_ALL))
glider@google.comf0fe00d2020-06-16 10:34:35 +0200800 stack = "byref_all(zero)";
Alexander Potapenko23a5c8c2019-07-11 20:59:23 -0700801 else if (IS_ENABLED(CONFIG_GCC_PLUGIN_STRUCTLEAK_BYREF))
glider@google.comf0fe00d2020-06-16 10:34:35 +0200802 stack = "byref(zero)";
Alexander Potapenko23a5c8c2019-07-11 20:59:23 -0700803 else if (IS_ENABLED(CONFIG_GCC_PLUGIN_STRUCTLEAK_USER))
glider@google.comf0fe00d2020-06-16 10:34:35 +0200804 stack = "__user(zero)";
Alexander Potapenko23a5c8c2019-07-11 20:59:23 -0700805 else
806 stack = "off";
807
808 pr_info("mem auto-init: stack:%s, heap alloc:%s, heap free:%s\n",
809 stack, want_init_on_alloc(GFP_KERNEL) ? "on" : "off",
810 want_init_on_free() ? "on" : "off");
811 if (want_init_on_free())
812 pr_info("mem auto-init: clearing system memory may take some time...\n");
813}
814
Pekka Enberg444f4782009-06-11 18:29:06 +0300815/*
816 * Set up kernel memory allocators
817 */
818static void __init mm_init(void)
819{
Joonsoo Kimeefa864b2014-12-12 16:55:46 -0800820 /*
821 * page_ext requires contiguous pages,
822 * bigger than MAX_ORDER unless SPARSEMEM.
823 */
824 page_ext_init_flatmem();
Vlastimil Babka8e57f8a2020-01-13 16:29:20 -0800825 init_debug_pagealloc();
Alexander Potapenko23a5c8c2019-07-11 20:59:23 -0700826 report_meminit();
Pekka Enberg444f4782009-06-11 18:29:06 +0300827 mem_init();
828 kmem_cache_init();
Catalin Marinasc5665862019-09-23 15:34:05 -0700829 kmemleak_init();
Kirill A. Shutemovb35f1812014-01-21 15:49:07 -0800830 pgtable_init();
Qian Caia9ee3a62018-12-28 00:32:32 -0800831 debug_objects_mem_init();
Pekka Enberg444f4782009-06-11 18:29:06 +0300832 vmalloc_init();
Toshi Kani0ddab1d2015-04-14 15:47:20 -0700833 ioremap_huge_init();
Thomas Gleixner613e3962017-12-17 10:56:29 +0100834 /* Should be run before the first non-init thread is created */
835 init_espfix_bsp();
Thomas Gleixneraa8c6242017-12-04 15:07:36 +0100836 /* Should be run after espfix64 is set up. */
837 pti_init();
Peter Zijlstra1ff14de2022-10-25 21:38:18 +0200838 mm_cache_init();
Pekka Enberg444f4782009-06-11 18:29:06 +0300839}
840
Martin Schwidefsky53c99bd62018-08-31 10:42:24 +0200841void __init __weak arch_call_rest_init(void)
842{
843 rest_init();
844}
845
Andrey Konovalovf9409d52020-08-06 23:25:05 -0700846asmlinkage __visible void __init __no_sanitize_address start_kernel(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700847{
Fabian Frederickdd4d9fe2014-08-08 14:23:44 -0700848 char *command_line;
849 char *after_dashes;
Andrew Morton033ab7f2006-06-30 01:55:50 -0700850
Aaron Tomlind4311ff2014-09-12 14:16:17 +0100851 set_task_stack_end_magic(&init_task);
Ming Lei73839c52011-11-17 13:34:31 +0800852 smp_setup_processor_id();
Thomas Gleixner3ac7fe52008-04-30 00:55:01 -0700853 debug_objects_early_init();
Ingo Molnar42059422008-02-14 09:44:08 +0100854
Paul Menageddbcc7e2007-10-18 23:39:30 -0700855 cgroup_init_early();
Ingo Molnarfbb9ce952006-07-03 00:24:50 -0700856
857 local_irq_disable();
Tejun Heo2ce802f2011-01-20 12:06:35 +0100858 early_boot_irqs_disabled = true;
Ingo Molnarfbb9ce952006-07-03 00:24:50 -0700859
Viresh Kumar1b3b3b42017-03-23 17:00:05 +0530860 /*
861 * Interrupts are still disabled. Do necessary setups, then
862 * enable them.
863 */
Stas Sergeev44fd2292006-03-23 02:59:44 -0800864 boot_cpu_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700865 page_address_init();
Andrew Mortonea676e82013-04-29 16:18:20 -0700866 pr_notice("%s", linux_banner);
Matthew Garrette6b1db92019-08-19 17:17:37 -0700867 early_security_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700868 setup_arch(&command_line);
Steven Rostedt (VMware)7495e092020-02-04 07:33:53 -0500869 setup_boot_config(command_line);
Alon Bar-Lev30d7e0d2007-02-12 00:53:52 -0800870 setup_command_line(command_line);
Mike Travise0982e92008-03-26 14:23:48 -0700871 setup_nr_cpu_ids();
Tejun Heod6647bd2009-07-21 17:11:50 +0900872 setup_per_cpu_areas();
Stas Sergeev44fd2292006-03-23 02:59:44 -0800873 smp_prepare_boot_cpu(); /* arch-specific boot-cpu hooks */
Linus Torvaldsb5b14042018-08-12 12:19:42 -0700874 boot_cpu_hotplug_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700875
Michal Hocko72675e12017-09-06 16:20:24 -0700876 build_all_zonelists(NULL);
Pekka Enberg83b519e2009-06-10 19:40:04 +0300877 page_alloc_init();
878
Masami Hiramatsu51887d02020-01-11 01:04:43 +0900879 pr_notice("Kernel command line: %s\n", saved_command_line);
Dan Williams60411862019-04-18 17:50:44 -0700880 /* parameters may set static keys */
881 jump_label_init();
Pekka Enberg83b519e2009-06-10 19:40:04 +0300882 parse_early_param();
Rusty Russell51e158c2014-04-28 11:34:33 +0930883 after_dashes = parse_args("Booting kernel",
884 static_command_line, __start___param,
885 __stop___param - __start___param,
Luis R. Rodriguezecc86172015-03-30 16:20:03 -0700886 -1, -1, NULL, &unknown_bootoption);
Daniel Thompson3438cf52014-11-11 16:29:46 +1030887 if (!IS_ERR_OR_NULL(after_dashes))
Rusty Russell51e158c2014-04-28 11:34:33 +0930888 parse_args("Setting init args", after_dashes, NULL, 0, -1, -1,
Luis R. Rodriguezecc86172015-03-30 16:20:03 -0700889 NULL, set_init_arg);
Masami Hiramatsu1319916202020-01-11 01:04:55 +0900890 if (extra_init_args)
891 parse_args("Setting extra init args", extra_init_args,
892 NULL, 0, -1, -1, NULL, set_init_arg);
Jeremy Fitzhardinge97ce2c82011-10-12 16:17:54 -0700893
Pekka Enberg83b519e2009-06-10 19:40:04 +0300894 /*
895 * These use large bootmem allocations and must precede
896 * kmem_cache_init()
897 */
Mike Travis162a7e72011-05-24 17:13:20 -0700898 setup_log_buf(0);
Pekka Enberg83b519e2009-06-10 19:40:04 +0300899 vfs_caches_init_early();
900 sort_main_extable();
901 trap_init();
Pekka Enberg444f4782009-06-11 18:29:06 +0300902 mm_init();
KOSAKI Motohirode03c722011-05-24 17:12:15 -0700903
Steven Rostedt (VMware)f6317182017-03-03 13:43:34 -0500904 ftrace_init();
905
Steven Rostedt (VMware)e725c732017-03-03 13:37:33 -0500906 /* trace_printk can be enabled here */
907 early_trace_init();
908
Linus Torvalds1da177e2005-04-16 15:20:36 -0700909 /*
910 * Set up the scheduler prior starting any interrupts (such as the
911 * timer interrupt). Full topology setup happens at smp_init()
912 * time - but meanwhile we still have a functioning scheduler.
913 */
914 sched_init();
Valentin Schneider3c51d822021-05-12 10:46:36 +0100915
Fabian Frederickdd4d9fe2014-08-08 14:23:44 -0700916 if (WARN(!irqs_disabled(),
917 "Interrupts were enabled *very* early, fixing it\n"))
Ard van Breemenc4a68302007-01-05 16:36:19 -0800918 local_irq_disable();
Matthew Wilcox0a835c42016-12-20 10:27:56 -0500919 radix_tree_init();
Tejun Heo3347fa02016-09-16 15:49:32 -0400920
921 /*
Tal Shorer7d229c62017-11-03 17:27:49 +0200922 * Set up housekeeping before setting up workqueues to allow the unbound
923 * workqueue to take non-housekeeping into account.
924 */
925 housekeeping_init();
926
927 /*
Tejun Heo3347fa02016-09-16 15:49:32 -0400928 * Allow workqueue creation and work item queueing/cancelling
929 * early. Work item execution depends on kthreads and starts after
930 * workqueue_init().
931 */
932 workqueue_init_early();
933
Linus Torvalds1da177e2005-04-16 15:20:36 -0700934 rcu_init();
Steven Rostedt (Red Hat)5f893b22014-12-12 20:05:10 -0500935
Steven Rostedt (VMware)e725c732017-03-03 13:37:33 -0500936 /* Trace events are available after this */
Steven Rostedt (Red Hat)5f893b22014-12-12 20:05:10 -0500937 trace_init();
938
Steven Rostedt (VMware)4e379582018-03-26 13:31:07 -0400939 if (initcall_debug)
940 initcall_debug_enable();
941
Frederic Weisbecker65f382f2013-07-11 19:12:32 +0200942 context_tracking_init();
Yinghai Lu0b8f1ef2008-12-05 18:58:31 -0800943 /* init some links before init_ISA_irqs() */
944 early_irq_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700945 init_IRQ();
Thomas Gleixnerad2b1352013-03-05 15:14:05 +0100946 tick_init();
Linus Torvaldsd6dd50e2014-10-13 15:44:12 +0200947 rcu_init_nohz();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700948 init_timers();
Thomas Gleixnerc0a31322006-01-09 20:52:32 -0800949 hrtimers_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700950 softirq_init();
john stultzad596172006-06-26 00:25:06 -0700951 timekeeping_init();
Jason A. Donenfeld7d9eab72022-05-05 02:20:22 +0200952 time_init();
Kees Cookd5553522019-04-19 23:27:05 -0400953
954 /*
955 * For best initial stack canary entropy, prepare it after:
956 * - setup_arch() for any UEFI RNG entropy and boot cmdline access
Jason A. Donenfeld5123cc62022-05-05 02:20:22 +0200957 * - timekeeping_init() for ktime entropy used in random_init()
Jason A. Donenfeld7d9eab72022-05-05 02:20:22 +0200958 * - time_init() for making random_get_entropy() work on some platforms
Jason A. Donenfeld5123cc62022-05-05 02:20:22 +0200959 * - random_init() to initialize the RNG from from early entropy sources
Kees Cookd5553522019-04-19 23:27:05 -0400960 */
Jason A. Donenfeld5123cc62022-05-05 02:20:22 +0200961 random_init(command_line);
Kees Cookd5553522019-04-19 23:27:05 -0400962 boot_init_stack_canary();
963
Stephane Eranian9e630202013-04-03 14:21:33 +0200964 perf_event_init();
Heiko Carstens93e02812006-07-03 00:24:24 -0700965 profile_init();
Takao Indohd8ad7d12011-03-29 12:35:04 -0400966 call_function_init();
Steven Rostedtf91eb622013-04-29 16:18:18 -0700967 WARN(!irqs_disabled(), "Interrupts were enabled early\n");
Joel Fernandes (Google)c3bc8fd2018-07-30 15:24:23 -0700968
Tejun Heo2ce802f2011-01-20 12:06:35 +0100969 early_boot_irqs_disabled = false;
Heiko Carstens93e02812006-07-03 00:24:24 -0700970 local_irq_enable();
Benjamin Herrenschmidtdcce2842009-06-18 13:24:12 +1000971
Pekka Enberg7e85ee02009-06-12 14:03:06 +0300972 kmem_cache_init_late();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700973
974 /*
975 * HACK ALERT! This is early. We're enabling the console before
976 * we've done PCI setups etc, and console_init() must be aware of
977 * this. But we do want output early, in case something goes wrong.
978 */
979 console_init();
980 if (panic_later)
Tetsuo Handa499a4582014-01-23 15:54:56 -0800981 panic("Too many boot %s vars at `%s'", panic_later,
982 panic_param);
Ingo Molnarfbb9ce952006-07-03 00:24:50 -0700983
Joel Fernandes (Google)c3bc8fd2018-07-30 15:24:23 -0700984 lockdep_init();
Ingo Molnarfbb9ce952006-07-03 00:24:50 -0700985
Ingo Molnar9a11b49a2006-07-03 00:24:33 -0700986 /*
987 * Need to run this when irqs are enabled, because it wants
988 * to self-test [hard/soft]-irqs on/off lock inversion bugs
989 * too:
990 */
991 locking_selftest();
992
Linus Torvalds1da177e2005-04-16 15:20:36 -0700993#ifdef CONFIG_BLK_DEV_INITRD
994 if (initrd_start && !initrd_below_start_ok &&
Geert Uytterhoevenbd673c72008-07-29 22:33:36 -0700995 page_to_pfn(virt_to_page((void *)initrd_start)) < min_low_pfn) {
Andrew Mortonea676e82013-04-29 16:18:20 -0700996 pr_crit("initrd overwritten (0x%08lx < 0x%08lx) - disabling it.\n",
Geert Uytterhoevenbd673c72008-07-29 22:33:36 -0700997 page_to_pfn(virt_to_page((void *)initrd_start)),
998 min_low_pfn);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700999 initrd_start = 0;
1000 }
1001#endif
Christoph Lametere7c8d5c2005-06-21 17:14:47 -07001002 setup_per_cpu_pageset();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001003 numa_policy_init();
Dou Liyang9c712062017-09-13 17:17:54 +08001004 acpi_early_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001005 if (late_time_init)
1006 late_time_init();
Pavel Tatashin857baa82018-07-19 16:55:42 -04001007 sched_clock_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001008 calibrate_delay();
Thomas Gleixner09658b82023-06-14 01:39:39 +02001009
1010 arch_cpu_finalize_init();
1011
Gargi Sharma95846ec2017-11-17 15:30:30 -08001012 pid_idr_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001013 anon_vma_init();
Linus Torvalds11520e52012-12-15 15:15:24 -08001014#ifdef CONFIG_X86
Matt Fleming83e68182012-11-14 09:42:35 +00001015 if (efi_enabled(EFI_RUNTIME_SERVICES))
Linus Torvalds11520e52012-12-15 15:15:24 -08001016 efi_enter_virtual_mode();
1017#endif
Linus Torvaldsb235bee2016-06-24 15:09:37 -07001018 thread_stack_cache_init();
David Howellsd84f4f92008-11-14 10:39:23 +11001019 cred_init();
Heinrich Schuchardtff691f62015-04-16 12:47:44 -07001020 fork_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001021 proc_caches_init();
Alexey Dobriyan3ea056c2018-04-10 16:32:36 -07001022 uts_ns_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001023 buffer_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001024 key_init();
1025 security_init();
Jason Wessel0b4b3822010-05-20 21:04:29 -05001026 dbg_late_init();
Mel Gorman4248b0d2015-08-06 15:46:20 -07001027 vfs_caches_init();
Nicholas Piggin62906022016-12-25 13:00:30 +10001028 pagecache_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001029 signals_init();
Alexey Dobriyan0965232032018-04-10 16:34:45 -07001030 seq_file_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001031 proc_root_init();
Al Viroe149ed22014-11-01 10:57:28 -04001032 nsfs_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001033 cpuset_init();
Zefan Li695df212015-03-04 17:09:33 +08001034 cgroup_init();
Shailabh Nagarc7572492006-07-14 00:24:40 -07001035 taskstats_init_early();
Shailabh Nagarca74e922006-07-14 00:24:36 -07001036 delayacct_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001037
Nadav Amit4fc19702019-04-26 16:22:46 -07001038 poking_init();
Thomas Gleixner6e606e62023-06-14 01:39:22 +02001039
Rafael J. Wysockib064a8f2015-06-10 01:33:36 +02001040 acpi_subsystem_init();
Thomas Gleixnere7ff3a42016-12-09 19:29:10 +01001041 arch_post_acpi_subsys_init();
Feng Tang6ae69962009-08-14 15:13:46 -04001042 sfi_init_late();
Marco Elverdfd402a2019-11-14 19:02:54 +01001043 kcsan_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001044
1045 /* Do the rest non-__init'ed, we're now alive */
Martin Schwidefsky53c99bd62018-08-31 10:42:24 +02001046 arch_call_rest_init();
Borislav Petkova9a3ed12020-04-22 18:11:30 +02001047
1048 prevent_tail_call_optimization();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001049}
1050
Peter Oberparleiterb99b87f2009-06-17 16:28:03 -07001051/* Call all constructor functions linked into the kernel. */
1052static void __init do_ctors(void)
1053{
1054#ifdef CONFIG_CONSTRUCTORS
H Hartley Sweeten196a15b2009-12-14 18:00:18 -08001055 ctor_fn_t *fn = (ctor_fn_t *) __ctors_start;
Peter Oberparleiterb99b87f2009-06-17 16:28:03 -07001056
H Hartley Sweeten196a15b2009-12-14 18:00:18 -08001057 for (; fn < (ctor_fn_t *) __ctors_end; fn++)
1058 (*fn)();
Peter Oberparleiterb99b87f2009-06-17 16:28:03 -07001059#endif
1060}
1061
Prarit Bhargava7b0b73d2014-06-04 16:12:17 -07001062#ifdef CONFIG_KALLSYMS
1063struct blacklist_entry {
1064 struct list_head next;
1065 char *buf;
1066};
1067
1068static __initdata_or_module LIST_HEAD(blacklisted_initcalls);
1069
1070static int __init initcall_blacklist(char *str)
1071{
1072 char *str_entry;
1073 struct blacklist_entry *entry;
1074
1075 /* str argument is a comma-separated list of functions */
1076 do {
1077 str_entry = strsep(&str, ",");
1078 if (str_entry) {
1079 pr_debug("blacklisting initcall %s\n", str_entry);
Mike Rapoport7e1c4e22018-10-30 15:09:57 -07001080 entry = memblock_alloc(sizeof(*entry),
1081 SMP_CACHE_BYTES);
Mike Rapoportf5c73102019-03-11 23:30:20 -07001082 if (!entry)
1083 panic("%s: Failed to allocate %zu bytes\n",
1084 __func__, sizeof(*entry));
Mike Rapoport7e1c4e22018-10-30 15:09:57 -07001085 entry->buf = memblock_alloc(strlen(str_entry) + 1,
1086 SMP_CACHE_BYTES);
Mike Rapoportf5c73102019-03-11 23:30:20 -07001087 if (!entry->buf)
1088 panic("%s: Failed to allocate %zu bytes\n",
1089 __func__, strlen(str_entry) + 1);
Prarit Bhargava7b0b73d2014-06-04 16:12:17 -07001090 strcpy(entry->buf, str_entry);
1091 list_add(&entry->next, &blacklisted_initcalls);
1092 }
1093 } while (str_entry);
1094
Randy Dunlap8d9efd42022-03-23 16:06:14 -07001095 return 1;
Prarit Bhargava7b0b73d2014-06-04 16:12:17 -07001096}
1097
1098static bool __init_or_module initcall_blacklisted(initcall_t fn)
1099{
Prarit Bhargava7b0b73d2014-06-04 16:12:17 -07001100 struct blacklist_entry *entry;
Rasmus Villemoesc8cdd2b2016-05-20 17:04:27 -07001101 char fn_name[KSYM_SYMBOL_LEN];
Rasmus Villemoes0fd5ed82016-06-24 14:50:30 -07001102 unsigned long addr;
Prarit Bhargava7b0b73d2014-06-04 16:12:17 -07001103
Rasmus Villemoesc8cdd2b2016-05-20 17:04:27 -07001104 if (list_empty(&blacklisted_initcalls))
Prarit Bhargava7b0b73d2014-06-04 16:12:17 -07001105 return false;
1106
Rasmus Villemoes0fd5ed82016-06-24 14:50:30 -07001107 addr = (unsigned long) dereference_function_descriptor(fn);
1108 sprint_symbol_no_offset(fn_name, addr);
Rasmus Villemoesc8cdd2b2016-05-20 17:04:27 -07001109
Prarit Bhargava841c06d2016-08-02 14:07:15 -07001110 /*
1111 * fn will be "function_name [module_name]" where [module_name] is not
1112 * displayed for built-in init functions. Strip off the [module_name].
1113 */
1114 strreplace(fn_name, ' ', '\0');
1115
Geliang Tange6fd1fb2016-03-15 14:52:46 -07001116 list_for_each_entry(entry, &blacklisted_initcalls, next) {
Prarit Bhargava7b0b73d2014-06-04 16:12:17 -07001117 if (!strcmp(fn_name, entry->buf)) {
1118 pr_debug("initcall %s blacklisted\n", fn_name);
Prarit Bhargava7b0b73d2014-06-04 16:12:17 -07001119 return true;
1120 }
1121 }
1122
Prarit Bhargava7b0b73d2014-06-04 16:12:17 -07001123 return false;
1124}
1125#else
1126static int __init initcall_blacklist(char *str)
1127{
1128 pr_warn("initcall_blacklist requires CONFIG_KALLSYMS\n");
1129 return 0;
1130}
1131
1132static bool __init_or_module initcall_blacklisted(initcall_t fn)
1133{
1134 return false;
1135}
1136#endif
1137__setup("initcall_blacklist=", initcall_blacklist);
1138
Steven Rostedt (VMware)4e379582018-03-26 13:31:07 -04001139static __init_or_module void
1140trace_initcall_start_cb(void *data, initcall_t fn)
Linus Torvaldse0df1542008-05-15 18:14:01 -07001141{
Steven Rostedt (VMware)4e379582018-03-26 13:31:07 -04001142 ktime_t *calltime = (ktime_t *)data;
Linus Torvaldse0df1542008-05-15 18:14:01 -07001143
Sakari Ailusd75f7732019-03-25 21:32:28 +02001144 printk(KERN_DEBUG "calling %pS @ %i\n", fn, task_pid_nr(current));
Steven Rostedt (VMware)4e379582018-03-26 13:31:07 -04001145 *calltime = ktime_get();
1146}
1147
1148static __init_or_module void
1149trace_initcall_finish_cb(void *data, initcall_t fn, int ret)
1150{
1151 ktime_t *calltime = (ktime_t *)data;
1152 ktime_t delta, rettime;
1153 unsigned long long duration;
1154
Kevin Winchester22c5c032010-08-09 17:20:32 -07001155 rettime = ktime_get();
Steven Rostedt (VMware)4e379582018-03-26 13:31:07 -04001156 delta = ktime_sub(rettime, *calltime);
Kevin Winchester22c5c032010-08-09 17:20:32 -07001157 duration = (unsigned long long) ktime_to_ns(delta) >> 10;
Sakari Ailusd75f7732019-03-25 21:32:28 +02001158 printk(KERN_DEBUG "initcall %pS returned %d after %lld usecs\n",
Andrew Mortonea676e82013-04-29 16:18:20 -07001159 fn, ret, duration);
Kevin Winchester22c5c032010-08-09 17:20:32 -07001160}
1161
Steven Rostedt (VMware)4e379582018-03-26 13:31:07 -04001162static ktime_t initcall_calltime;
1163
Steven Rostedt (VMware)b0dc52f2018-04-06 09:24:25 -04001164#ifdef TRACEPOINTS_ENABLED
Steven Rostedt (VMware)4e379582018-03-26 13:31:07 -04001165static void __init initcall_debug_enable(void)
1166{
1167 int ret;
1168
1169 ret = register_trace_initcall_start(trace_initcall_start_cb,
1170 &initcall_calltime);
1171 ret |= register_trace_initcall_finish(trace_initcall_finish_cb,
1172 &initcall_calltime);
1173 WARN(ret, "Failed to register initcall tracepoints\n");
Kevin Winchester22c5c032010-08-09 17:20:32 -07001174}
Steven Rostedt (VMware)b0dc52f2018-04-06 09:24:25 -04001175# define do_trace_initcall_start trace_initcall_start
1176# define do_trace_initcall_finish trace_initcall_finish
1177#else
1178static inline void do_trace_initcall_start(initcall_t fn)
1179{
1180 if (!initcall_debug)
1181 return;
1182 trace_initcall_start_cb(&initcall_calltime, fn);
1183}
1184static inline void do_trace_initcall_finish(initcall_t fn, int ret)
1185{
1186 if (!initcall_debug)
1187 return;
1188 trace_initcall_finish_cb(&initcall_calltime, fn, ret);
1189}
1190#endif /* !TRACEPOINTS_ENABLED */
Kevin Winchester22c5c032010-08-09 17:20:32 -07001191
Kevin Winchestere4461272010-08-09 17:20:32 -07001192int __init_or_module do_one_initcall(initcall_t fn)
Kevin Winchester22c5c032010-08-09 17:20:32 -07001193{
1194 int count = preempt_count();
Steven Rostedtff1c8fa2013-07-03 15:05:37 -07001195 char msgbuf[64];
Steven Rostedt (VMware)4e379582018-03-26 13:31:07 -04001196 int ret;
Kevin Winchester22c5c032010-08-09 17:20:32 -07001197
Prarit Bhargava7b0b73d2014-06-04 16:12:17 -07001198 if (initcall_blacklisted(fn))
1199 return -EPERM;
1200
Steven Rostedt (VMware)b0dc52f2018-04-06 09:24:25 -04001201 do_trace_initcall_start(fn);
Steven Rostedt (VMware)4e379582018-03-26 13:31:07 -04001202 ret = fn();
Steven Rostedt (VMware)b0dc52f2018-04-06 09:24:25 -04001203 do_trace_initcall_finish(fn, ret);
Linus Torvaldse0df1542008-05-15 18:14:01 -07001204
1205 msgbuf[0] = 0;
1206
Linus Torvaldse0df1542008-05-15 18:14:01 -07001207 if (preempt_count() != count) {
Steven Rostedtbf5d7702013-05-01 13:35:51 -04001208 sprintf(msgbuf, "preemption imbalance ");
Peter Zijlstra4a2b4b22013-08-14 14:55:24 +02001209 preempt_count_set(count);
Linus Torvaldse0df1542008-05-15 18:14:01 -07001210 }
1211 if (irqs_disabled()) {
Cyrill Gorcunova76bfd02008-05-15 13:52:41 -07001212 strlcat(msgbuf, "disabled interrupts ", sizeof(msgbuf));
Linus Torvaldse0df1542008-05-15 18:14:01 -07001213 local_irq_enable();
1214 }
Sakari Ailusd75f7732019-03-25 21:32:28 +02001215 WARN(msgbuf[0], "initcall %pS returned with %s\n", fn, msgbuf);
Arjan van de Ven59f94152008-07-30 12:49:02 -07001216
Emese Revfy38addce2016-06-20 20:41:19 +02001217 add_latent_entropy();
Américo Wang30dbb20e2010-05-26 18:57:53 +08001218 return ret;
Linus Torvaldse0df1542008-05-15 18:14:01 -07001219}
1220
1221
Ard Biesheuvel1b1eeca2018-08-21 21:56:13 -07001222extern initcall_entry_t __initcall_start[];
1223extern initcall_entry_t __initcall0_start[];
1224extern initcall_entry_t __initcall1_start[];
1225extern initcall_entry_t __initcall2_start[];
1226extern initcall_entry_t __initcall3_start[];
1227extern initcall_entry_t __initcall4_start[];
1228extern initcall_entry_t __initcall5_start[];
1229extern initcall_entry_t __initcall6_start[];
1230extern initcall_entry_t __initcall7_start[];
1231extern initcall_entry_t __initcall_end[];
Pawel Moll026cee02012-03-26 12:50:51 +10301232
Ard Biesheuvel1b1eeca2018-08-21 21:56:13 -07001233static initcall_entry_t *initcall_levels[] __initdata = {
Pawel Moll026cee02012-03-26 12:50:51 +10301234 __initcall0_start,
1235 __initcall1_start,
1236 __initcall2_start,
1237 __initcall3_start,
1238 __initcall4_start,
1239 __initcall5_start,
1240 __initcall6_start,
1241 __initcall7_start,
1242 __initcall_end,
1243};
1244
Jim Cromie96263d22012-06-14 16:00:59 -06001245/* Keep these in sync with initcalls in include/linux/init.h */
Alexey Dobriyan7c8f7192019-01-03 15:27:29 -08001246static const char *initcall_level_names[] __initdata = {
Steven Rostedt (VMware)a6fb6012018-03-22 19:28:54 -04001247 "pure",
Jim Cromie9fb48c72012-04-27 14:30:34 -06001248 "core",
1249 "postcore",
1250 "arch",
1251 "subsys",
1252 "fs",
1253 "device",
1254 "late",
Pawel Moll026cee02012-03-26 12:50:51 +10301255};
1256
Arvind Sankar7e2762e2020-01-30 22:17:16 -08001257static int __init ignore_unknown_bootoption(char *param, char *val,
1258 const char *unused, void *arg)
1259{
1260 return 0;
1261}
1262
Masami Hiramatsu0068c922020-01-11 01:04:31 +09001263static void __init do_initcall_level(int level, char *command_line)
Pawel Moll026cee02012-03-26 12:50:51 +10301264{
Ard Biesheuvel1b1eeca2018-08-21 21:56:13 -07001265 initcall_entry_t *fn;
Pawel Moll026cee02012-03-26 12:50:51 +10301266
Pawel Moll026cee02012-03-26 12:50:51 +10301267 parse_args(initcall_level_names[level],
Masami Hiramatsu0068c922020-01-11 01:04:31 +09001268 command_line, __start___param,
Pawel Moll026cee02012-03-26 12:50:51 +10301269 __stop___param - __start___param,
1270 level, level,
Arvind Sankar7e2762e2020-01-30 22:17:16 -08001271 NULL, ignore_unknown_bootoption);
Pawel Moll026cee02012-03-26 12:50:51 +10301272
Steven Rostedt (VMware)4ee7c602018-03-23 10:18:03 -04001273 trace_initcall_level(initcall_level_names[level]);
Pawel Moll026cee02012-03-26 12:50:51 +10301274 for (fn = initcall_levels[level]; fn < initcall_levels[level+1]; fn++)
Ard Biesheuvel1b1eeca2018-08-21 21:56:13 -07001275 do_one_initcall(initcall_from_entry(fn));
Pawel Moll026cee02012-03-26 12:50:51 +10301276}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001277
1278static void __init do_initcalls(void)
1279{
Pawel Moll026cee02012-03-26 12:50:51 +10301280 int level;
Masami Hiramatsu0068c922020-01-11 01:04:31 +09001281 size_t len = strlen(saved_command_line) + 1;
1282 char *command_line;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001283
Masami Hiramatsu0068c922020-01-11 01:04:31 +09001284 command_line = kzalloc(len, GFP_KERNEL);
1285 if (!command_line)
1286 panic("%s: Failed to allocate %zu bytes\n", __func__, len);
1287
1288 for (level = 0; level < ARRAY_SIZE(initcall_levels) - 1; level++) {
1289 /* Parser modifies command_line, restore it each time */
1290 strcpy(command_line, saved_command_line);
1291 do_initcall_level(level, command_line);
1292 }
1293
1294 kfree(command_line);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001295}
1296
1297/*
1298 * Ok, the machine is now initialized. None of the devices
1299 * have been touched yet, but the CPU subsystem is up and
1300 * running, and memory and process management works.
1301 *
1302 * Now we can finally start doing some real work..
1303 */
1304static void __init do_basic_setup(void)
1305{
Lai Jiangshan759ee092009-03-25 17:06:30 +08001306 cpuset_init_smp();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001307 driver_init();
Eric W. Biedermanb04c3af2007-02-14 00:33:57 -08001308 init_irq_proc();
Peter Oberparleiterb99b87f2009-06-17 16:28:03 -07001309 do_ctors();
Linus Torvaldsd5767c52011-09-28 10:23:44 -07001310 usermodehelper_enable();
wangyanqingb0f84372011-09-29 15:09:40 +08001311 do_initcalls();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001312}
1313
Eduard - Gabriel Munteanu7babe8d2008-07-25 19:45:11 -07001314static void __init do_pre_smp_initcalls(void)
Eduard - Gabriel Munteanuc2147a52008-07-25 19:45:11 -07001315{
Ard Biesheuvel1b1eeca2018-08-21 21:56:13 -07001316 initcall_entry_t *fn;
Eduard - Gabriel Munteanuc2147a52008-07-25 19:45:11 -07001317
Steven Rostedt (VMware)4ee7c602018-03-23 10:18:03 -04001318 trace_initcall_level("early");
Pawel Moll026cee02012-03-26 12:50:51 +10301319 for (fn = __initcall_start; fn < __initcall0_start; fn++)
Ard Biesheuvel1b1eeca2018-08-21 21:56:13 -07001320 do_one_initcall(initcall_from_entry(fn));
Eduard - Gabriel Munteanuc2147a52008-07-25 19:45:11 -07001321}
1322
Al Viroa74fb732012-10-10 21:28:25 -04001323static int run_init_process(const char *init_filename)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001324{
Arvind Sankarb88c50a2020-01-30 22:17:13 -08001325 const char *const *p;
1326
Linus Torvalds1da177e2005-04-16 15:20:36 -07001327 argv_init[0] = init_filename;
Paul Menzel3f5c15d2018-08-21 21:58:37 -07001328 pr_info("Run %s as init process\n", init_filename);
Arvind Sankarb88c50a2020-01-30 22:17:13 -08001329 pr_debug(" with arguments:\n");
1330 for (p = argv_init; *p; p++)
1331 pr_debug(" %s\n", *p);
1332 pr_debug(" with environment:\n");
1333 for (p = envp_init; *p; p++)
1334 pr_debug(" %s\n", *p);
Eric W. Biedermanbe619f72020-07-13 12:06:48 -05001335 return kernel_execve(init_filename, argv_init, envp_init);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001336}
1337
Michael Opdenackerba247622013-11-12 15:10:21 -08001338static int try_to_run_init_process(const char *init_filename)
1339{
1340 int ret;
1341
1342 ret = run_init_process(init_filename);
1343
1344 if (ret && ret != -ENOENT) {
1345 pr_err("Starting init: %s exists but couldn't execute it (error %d)\n",
1346 init_filename, ret);
1347 }
1348
1349 return ret;
1350}
1351
Vineet Guptaf80b0c92012-12-21 12:25:44 +05301352static noinline void __init kernel_init_freeable(void);
Al Virod6b21232012-10-10 19:57:26 -04001353
Laura Abbott0f5bf6d2017-02-06 16:31:58 -08001354#if defined(CONFIG_STRICT_KERNEL_RWX) || defined(CONFIG_STRICT_MODULE_RWX)
AKASHI Takahiro39290b32016-11-14 15:15:05 +09001355bool rodata_enabled __ro_after_init = true;
Kees Cookd2aa1ac2016-02-17 14:41:13 -08001356static int __init set_debug_rodata(char *str)
1357{
Randy Dunlap8d9efd42022-03-23 16:06:14 -07001358 if (strtobool(str, &rodata_enabled))
1359 pr_warn("Invalid option string for rodata: '%s'\n", str);
1360 return 1;
Kees Cookd2aa1ac2016-02-17 14:41:13 -08001361}
1362__setup("rodata=", set_debug_rodata);
AKASHI Takahiro39290b32016-11-14 15:15:05 +09001363#endif
Kees Cookd2aa1ac2016-02-17 14:41:13 -08001364
Laura Abbott0f5bf6d2017-02-06 16:31:58 -08001365#ifdef CONFIG_STRICT_KERNEL_RWX
Kees Cookd2aa1ac2016-02-17 14:41:13 -08001366static void mark_readonly(void)
1367{
Jinbum Park2959a5f2017-02-27 14:30:22 -08001368 if (rodata_enabled) {
Jeffrey Hugoae646f02018-05-11 16:01:42 -07001369 /*
Paul E. McKenneyba180312018-11-06 18:58:01 -08001370 * load_module() results in W+X mappings, which are cleaned
1371 * up with call_rcu(). Let's make sure that queued work is
Jeffrey Hugoae646f02018-05-11 16:01:42 -07001372 * flushed so that we don't hit false positives looking for
1373 * insecure pages which are W+X.
1374 */
Paul E. McKenneyba180312018-11-06 18:58:01 -08001375 rcu_barrier();
Kees Cookd2aa1ac2016-02-17 14:41:13 -08001376 mark_rodata_ro();
Jinbum Park2959a5f2017-02-27 14:30:22 -08001377 rodata_test();
1378 } else
Kees Cookd2aa1ac2016-02-17 14:41:13 -08001379 pr_info("Kernel memory protection disabled.\n");
1380}
Christophe Leroyf596ded12020-01-30 22:17:23 -08001381#elif defined(CONFIG_ARCH_HAS_STRICT_KERNEL_RWX)
1382static inline void mark_readonly(void)
1383{
1384 pr_warn("Kernel memory protection not selected by kernel config.\n");
1385}
Kees Cookd2aa1ac2016-02-17 14:41:13 -08001386#else
1387static inline void mark_readonly(void)
1388{
1389 pr_warn("This architecture does not have kernel memory protection.\n");
1390}
1391#endif
1392
Mike Rapoport997aef62019-05-13 17:18:40 -07001393void __weak free_initmem(void)
1394{
Mike Rapoportf4039992019-05-13 17:18:46 -07001395 free_initmem_default(POISON_FREE_INITMEM);
Mike Rapoport997aef62019-05-13 17:18:40 -07001396}
1397
Al Virod6b21232012-10-10 19:57:26 -04001398static int __ref kernel_init(void *unused)
Vivek Goyalee5bfa62007-02-13 13:26:22 +01001399{
Michael Opdenackerba247622013-11-12 15:10:21 -08001400 int ret;
1401
Al Virod6b21232012-10-10 19:57:26 -04001402 kernel_init_freeable();
Arjan van de Ven22a9d642009-01-07 08:45:46 -08001403 /* need to finish all async __init code before freeing the memory */
1404 async_synchronize_full();
Masami Hiramatsu82d083a2020-09-10 17:55:05 +09001405 kprobe_free_init_mem();
Steven Rostedt (VMware)b80f0f62017-04-03 12:57:35 -04001406 ftrace_free_init_mem();
Sumit Garg13e83182021-02-25 17:22:38 -08001407 kgdb_free_init_mem();
Vivek Goyalee5bfa62007-02-13 13:26:22 +01001408 free_initmem();
Kees Cookd2aa1ac2016-02-17 14:41:13 -08001409 mark_readonly();
Joerg Roedelb9766902018-07-18 11:41:06 +02001410
1411 /*
1412 * Kernel mappings are now finalized - update the userspace page-table
1413 * to finalize PTI.
1414 */
1415 pti_finalize();
1416
Vivek Goyalee5bfa62007-02-13 13:26:22 +01001417 system_state = SYSTEM_RUNNING;
1418 numa_default_policy();
1419
Paul E. McKenney967dcb82015-11-25 16:52:36 -08001420 rcu_end_inkernel_boot();
1421
Vlastimil Babka3db978d2020-06-07 21:40:24 -07001422 do_sysctl_args();
1423
Vivek Goyalee5bfa62007-02-13 13:26:22 +01001424 if (ramdisk_execute_command) {
Michael Opdenackerba247622013-11-12 15:10:21 -08001425 ret = run_init_process(ramdisk_execute_command);
1426 if (!ret)
Al Viroa74fb732012-10-10 21:28:25 -04001427 return 0;
Michael Opdenackerba247622013-11-12 15:10:21 -08001428 pr_err("Failed to execute %s (error %d)\n",
1429 ramdisk_execute_command, ret);
Vivek Goyalee5bfa62007-02-13 13:26:22 +01001430 }
1431
1432 /*
1433 * We try each of these until one succeeds.
1434 *
1435 * The Bourne shell can be used instead of init if we are
1436 * trying to recover a really broken machine.
1437 */
1438 if (execute_command) {
Michael Opdenackerba247622013-11-12 15:10:21 -08001439 ret = run_init_process(execute_command);
1440 if (!ret)
Al Viroa74fb732012-10-10 21:28:25 -04001441 return 0;
Andy Lutomirski6ef45362014-12-10 15:52:19 -08001442 panic("Requested init %s failed (error %d).",
1443 execute_command, ret);
Vivek Goyalee5bfa62007-02-13 13:26:22 +01001444 }
Chris Downada4ab72020-06-04 16:50:53 -07001445
1446 if (CONFIG_DEFAULT_INIT[0] != '\0') {
1447 ret = run_init_process(CONFIG_DEFAULT_INIT);
1448 if (ret)
1449 pr_err("Default init %s failed (error %d)\n",
1450 CONFIG_DEFAULT_INIT, ret);
1451 else
1452 return 0;
1453 }
1454
Michael Opdenackerba247622013-11-12 15:10:21 -08001455 if (!try_to_run_init_process("/sbin/init") ||
1456 !try_to_run_init_process("/etc/init") ||
1457 !try_to_run_init_process("/bin/init") ||
1458 !try_to_run_init_process("/bin/sh"))
Al Viroa74fb732012-10-10 21:28:25 -04001459 return 0;
Vivek Goyalee5bfa62007-02-13 13:26:22 +01001460
Michael Opdenackerba247622013-11-12 15:10:21 -08001461 panic("No working init found. Try passing init= option to kernel. "
Mauro Carvalho Chehab8c27ceff32016-10-18 10:12:27 -02001462 "See Linux Documentation/admin-guide/init.rst for guidance.");
Vivek Goyalee5bfa62007-02-13 13:26:22 +01001463}
1464
Christoph Hellwig8f740632020-06-07 17:44:28 +02001465/* Open /dev/console, for stdin/stdout/stderr, this should never fail */
Christoph Hellwiga94b5212020-07-28 18:23:21 +02001466void __init console_on_rootfs(void)
Dominik Brodowskib49a7332018-10-23 16:00:10 +02001467{
Christoph Hellwig8f740632020-06-07 17:44:28 +02001468 struct file *file = filp_open("/dev/console", O_RDWR, 0);
Dominik Brodowskib49a7332018-10-23 16:00:10 +02001469
Christoph Hellwig8f740632020-06-07 17:44:28 +02001470 if (IS_ERR(file)) {
1471 pr_err("Warning: unable to open an initial console.\n");
1472 return;
1473 }
Christoph Hellwigf0735312020-07-28 17:49:47 +02001474 init_dup(file);
1475 init_dup(file);
1476 init_dup(file);
1477 fput(file);
Dominik Brodowskib49a7332018-10-23 16:00:10 +02001478}
1479
Vineet Guptaf80b0c92012-12-21 12:25:44 +05301480static noinline void __init kernel_init_freeable(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001481{
Peter Zijlstrab433c3d2010-06-28 16:51:01 +02001482 /*
1483 * Wait until kthreadd is all set-up.
1484 */
1485 wait_for_completion(&kthreadd_done);
Linus Torvalds31a67102012-05-21 12:52:42 -07001486
1487 /* Now the scheduler is fully set up and can do blocking allocations */
1488 gfp_allowed_mask = __GFP_BITS_MASK;
1489
Miao Xie58568d22009-06-16 15:31:49 -07001490 /*
1491 * init can allocate pages on any node
1492 */
Lai Jiangshan3c466d42012-12-12 13:51:40 -08001493 set_mems_allowed(node_states[N_MEMORY]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001494
Mark Rutland7178be02021-06-04 20:01:14 -07001495 cad_pid = get_pid(task_pid(current));
Cedric Le Goater9ec52092006-10-02 02:19:00 -07001496
Andi Kleenca74a6f2008-01-30 13:33:17 +01001497 smp_prepare_cpus(setup_max_cpus);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001498
Tejun Heo3347fa02016-09-16 15:49:32 -04001499 workqueue_init();
1500
Michal Hocko597b7302017-03-31 15:11:47 -07001501 init_mm_internals();
1502
Uladzislau Rezki (Sony)30b491e2020-12-09 21:27:31 +01001503 rcu_init_tasks_generic();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001504 do_pre_smp_initcalls();
Peter Zijlstra004417a2010-11-25 18:38:29 +01001505 lockup_detector_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001506
Linus Torvalds1da177e2005-04-16 15:20:36 -07001507 smp_init();
1508 sched_init_smp();
1509
Daniel Jordanf1b192b2020-06-03 15:59:35 -07001510 padata_init();
Mel Gorman0e1cc952015-06-30 14:57:27 -07001511 page_alloc_init_late();
Qian Cai2f1ee092019-02-12 15:36:03 -08001512 /* Initialize page ext after all struct pages are initialized. */
1513 page_ext_init();
Mel Gorman0e1cc952015-06-30 14:57:27 -07001514
Linus Torvalds1da177e2005-04-16 15:20:36 -07001515 do_basic_setup();
1516
Brendan Higgins8c0d8842020-08-04 13:47:43 -07001517 kunit_run_all_tests();
1518
Dominik Brodowskib49a7332018-10-23 16:00:10 +02001519 console_on_rootfs();
Eric W. Biederman2bd3a9972010-03-02 23:53:19 -08001520
Linus Torvalds1da177e2005-04-16 15:20:36 -07001521 /*
1522 * check if there is an early userspace init. If yes, let it do all
1523 * the work
1524 */
Christoph Hellwigeb9d7d32020-07-22 11:14:02 +02001525 if (init_eaccess(ramdisk_execute_command) != 0) {
Olof Johanssonffdfc402005-09-06 15:17:19 -07001526 ramdisk_execute_command = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001527 prepare_namespace();
Olof Johanssonffdfc402005-09-06 15:17:19 -07001528 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001529
1530 /*
1531 * Ok, we have completed the initial bootup, and
1532 * we're essentially up and running. Get rid of the
1533 * initmem segments and start the user-mode stuff..
Dmitry Kasatkinc9cd2ce2014-11-05 17:01:15 +02001534 *
1535 * rootfs is available now, try loading the public keys
1536 * and default modules
Linus Torvalds1da177e2005-04-16 15:20:36 -07001537 */
Tejun Heobb813f42013-01-18 14:05:56 -08001538
Dmitry Kasatkinc9cd2ce2014-11-05 17:01:15 +02001539 integrity_load_keys();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001540}