blob: 17cce3658a8bb72cc786a939bb29b91e68aca08a [file] [log] [blame]
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>
Alexander Potapenkoadb54c72021-01-22 09:18:31 +000043#include <linux/kfence.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070044#include <linux/rcupdate.h>
45#include <linux/moduleparam.h>
46#include <linux/kallsyms.h>
47#include <linux/writeback.h>
48#include <linux/cpu.h>
49#include <linux/cpuset.h>
Paul Menageddbcc7e2007-10-18 23:39:30 -070050#include <linux/cgroup.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070051#include <linux/efi.h>
Thomas Gleixner906568c2007-02-16 01:28:01 -080052#include <linux/tick.h>
Frederic Weisbecker78634062017-10-27 04:42:28 +020053#include <linux/sched/isolation.h>
Andrew Morton6168a702007-02-17 21:22:39 -080054#include <linux/interrupt.h>
Shailabh Nagarc7572492006-07-14 00:24:40 -070055#include <linux/taskstats_kern.h>
Shailabh Nagarca74e922006-07-14 00:24:36 -070056#include <linux/delayacct.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070057#include <linux/unistd.h>
Alexey Dobriyan3ea056c2018-04-10 16:32:36 -070058#include <linux/utsname.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070059#include <linux/rmap.h>
60#include <linux/mempolicy.h>
61#include <linux/key.h>
Adrian Bunkb6cd0b72006-06-27 02:53:54 -070062#include <linux/buffer_head.h>
Joonsoo Kimeefa864b2014-12-12 16:55:46 -080063#include <linux/page_ext.h>
Ingo Molnar9a11b49a2006-07-03 00:24:33 -070064#include <linux/debug_locks.h>
Thomas Gleixner3ac7fe52008-04-30 00:55:01 -070065#include <linux/debugobjects.h>
Ingo Molnarfbb9ce952006-07-03 00:24:50 -070066#include <linux/lockdep.h>
Catalin Marinas3c7b4e62009-06-11 13:22:39 +010067#include <linux/kmemleak.h>
Daniel Jordanf1b192b2020-06-03 15:59:35 -070068#include <linux/padata.h>
Sukadev Bhattiprolu84d73782006-12-08 02:38:01 -080069#include <linux/pid_namespace.h>
Greg Kroah-Hartman4c002c92019-12-09 20:33:03 +010070#include <linux/device/driver.h>
Eric W. Biederman73c27992007-05-09 02:34:32 -070071#include <linux/kthread.h>
Adrian Bunke6fe6642007-11-09 22:39:39 +010072#include <linux/sched.h>
Ingo Molnar1777e462017-02-05 14:47:12 +010073#include <linux/sched/init.h>
Adrian Bunka1c9eea2008-02-06 01:36:44 -080074#include <linux/signal.h>
Akinobu Mita199f0ca2008-04-29 01:03:13 -070075#include <linux/idr.h>
Jason Wessel0b4b3822010-05-20 21:04:29 -050076#include <linux/kgdb.h>
Steven Rostedt68bf21a2008-08-14 15:45:08 -040077#include <linux/ftrace.h>
Arjan van de Ven22a9d642009-01-07 08:45:46 -080078#include <linux/async.h>
Feng Tang6ae69962009-08-14 15:13:46 -040079#include <linux/sfi.h>
Kay Sievers2b2af542009-04-30 15:23:42 +020080#include <linux/shmem_fs.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090081#include <linux/slab.h>
Peter Zijlstra24a24bb2010-11-17 23:17:33 +010082#include <linux/perf_event.h>
Al Viroa74fb732012-10-10 21:28:25 -040083#include <linux/ptrace.h>
Thomas Gleixneraa8c6242017-12-04 15:07:36 +010084#include <linux/pti.h>
Tejun Heobb813f42013-01-18 14:05:56 -080085#include <linux/blkdev.h>
86#include <linux/elevator.h>
Pavel Tatashin5d2a4e92018-07-19 16:55:41 -040087#include <linux/sched/clock.h>
Ingo Molnar29930022017-02-08 18:51:36 +010088#include <linux/sched/task.h>
Ingo Molnar68db0cf2017-02-08 18:51:37 +010089#include <linux/sched/task_stack.h>
Frederic Weisbecker65f382f2013-07-11 19:12:32 +020090#include <linux/context_tracking.h>
Theodore Ts'o47d06e52013-09-10 10:52:35 -040091#include <linux/random.h>
Prarit Bhargava7b0b73d2014-06-04 16:12:17 -070092#include <linux/list.h>
Dmitry Kasatkinc9cd2ce2014-11-05 17:01:15 +020093#include <linux/integrity.h>
Al Viroe149ed22014-11-01 10:57:28 -040094#include <linux/proc_ns.h>
Toshi Kani0ddab1d2015-04-14 15:47:20 -070095#include <linux/io.h>
AKASHI Takahiro39290b32016-11-14 15:15:05 +090096#include <linux/cache.h>
Jinbum Park2959a5f2017-02-27 14:30:22 -080097#include <linux/rodata_test.h>
Josh Poimboeuf33352242018-02-20 11:37:51 -060098#include <linux/jump_label.h>
Mathieu Malaterreae67d582018-05-25 14:48:00 -070099#include <linux/mem_encrypt.h>
Marco Elverdfd402a2019-11-14 19:02:54 +0100100#include <linux/kcsan.h>
Christoph Hellwigeb9d7d32020-07-22 11:14:02 +0200101#include <linux/init_syscalls.h>
Vijayanand Jittabfed1c32021-02-12 17:14:55 +1100102#include <linux/stackdepot.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103
104#include <asm/io.h>
105#include <asm/bugs.h>
106#include <asm/setup.h>
Andi Kleena9401992005-07-28 21:15:30 -0700107#include <asm/sections.h>
Arjan van de Ven37b73c82006-01-06 00:12:01 -0800108#include <asm/cacheflush.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109
Steven Rostedt (VMware)4ee7c602018-03-23 10:18:03 -0400110#define CREATE_TRACE_POINTS
111#include <trace/events/initcall.h>
112
Brendan Higgins8c0d8842020-08-04 13:47:43 -0700113#include <kunit/test.h>
114
Sam Ravnborgaae5f662007-02-26 16:45:41 +0100115static int kernel_init(void *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116
117extern void init_IRQ(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118extern void radix_tree_init(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119
Tejun Heo2ce802f2011-01-20 12:06:35 +0100120/*
121 * Debug helper: via this flag we know that we are in 'early bootup code'
122 * where only the boot processor is running with IRQ disabled. This means
123 * two things - IRQ must not be enabled before the flag is cleared and some
124 * operations which are not allowed with IRQ disabled are allowed while the
125 * flag is set.
126 */
127bool early_boot_irqs_disabled __read_mostly;
128
Paul E. McKenneya6826042009-02-25 18:03:42 -0800129enum system_states system_state __read_mostly;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130EXPORT_SYMBOL(system_state);
131
132/*
133 * Boot command-line arguments
134 */
135#define MAX_INIT_ARGS CONFIG_INIT_ENV_ARG_LIMIT
136#define MAX_INIT_ENVS CONFIG_INIT_ENV_ARG_LIMIT
137
138extern void time_init(void);
139/* Default late time init is NULL. archs can override this later. */
Jan Beulichd2e31922009-01-06 14:41:10 -0800140void (*__initdata late_time_init)(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141
Alon Bar-Lev30d7e0d2007-02-12 00:53:52 -0800142/* Untouched command line saved by arch-specific code. */
143char __initdata boot_command_line[COMMAND_LINE_SIZE];
144/* Untouched saved command line (eg. for /proc) */
145char *saved_command_line;
146/* Command line for parameter parsing */
147static char *static_command_line;
Masami Hiramatsu51887d02020-01-11 01:04:43 +0900148/* Untouched extra command line */
149static char *extra_command_line;
Masami Hiramatsu1319916202020-01-11 01:04:55 +0900150/* Extra init arguments */
151static char *extra_init_args;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152
Steven Rostedt (VMware)f61872b2020-02-07 19:07:37 -0500153#ifdef CONFIG_BOOT_CONFIG
154/* Is bootconfig on command line? */
155static bool bootconfig_found;
156static bool initargs_found;
157#else
158# define bootconfig_found false
159# define initargs_found false
160#endif
161
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162static char *execute_command;
Christoph Hellwig916db732020-06-07 09:06:29 +0200163static char *ramdisk_execute_command = "/init";
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164
Jan Beulich8b3b2952007-07-15 23:41:07 -0700165/*
Hannes Frederic Sowac4b2c0c2013-10-19 21:48:53 +0200166 * Used to generate warnings if static_key manipulation functions are used
167 * before jump_label_init is called.
168 */
Fabian Frederickdd4d9fe2014-08-08 14:23:44 -0700169bool static_key_initialized __read_mostly;
Hannes Frederic Sowac4b2c0c2013-10-19 21:48:53 +0200170EXPORT_SYMBOL_GPL(static_key_initialized);
171
172/*
Jan Beulich8b3b2952007-07-15 23:41:07 -0700173 * If set, this is an indication to the drivers that reset the underlying
174 * device before going ahead with the initialization otherwise driver might
175 * rely on the BIOS and skip the reset operation.
176 *
177 * This is useful if kernel is booting in an unreliable environment.
Frans Klaverfc454fd2015-02-23 22:05:56 +0100178 * For ex. kdump situation where previous kernel has crashed, BIOS has been
Jan Beulich8b3b2952007-07-15 23:41:07 -0700179 * skipped and devices will be in unknown state.
180 */
181unsigned int reset_devices;
182EXPORT_SYMBOL(reset_devices);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183
Vivek Goyal7e962872006-09-27 01:50:44 -0700184static int __init set_reset_devices(char *str)
185{
186 reset_devices = 1;
187 return 1;
188}
189
190__setup("reset_devices", set_reset_devices);
191
Fabian Frederickdd4d9fe2014-08-08 14:23:44 -0700192static const char *argv_init[MAX_INIT_ARGS+2] = { "init", NULL, };
193const char *envp_init[MAX_INIT_ENVS+2] = { "HOME=/", "TERM=linux", NULL, };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194static const char *panic_later, *panic_param;
195
Rusty Russell914dcaa2010-08-11 23:04:18 -0600196extern const struct obs_kernel_param __setup_start[], __setup_end[];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197
Yaowei Bai31c025b2016-01-20 14:59:27 -0800198static bool __init obsolete_checksetup(char *line)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199{
Rusty Russell914dcaa2010-08-11 23:04:18 -0600200 const struct obs_kernel_param *p;
Yaowei Bai31c025b2016-01-20 14:59:27 -0800201 bool had_early_param = false;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202
203 p = __setup_start;
204 do {
205 int n = strlen(p->str);
Michal Schmidtb1e4d202011-10-10 00:03:37 +0200206 if (parameqn(line, p->str, n)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207 if (p->early) {
Rusty Russell33df0d12006-09-26 10:52:32 +0200208 /* Already done in parse_early_param?
209 * (Needs exact match on param part).
210 * Keep iterating, as we can have early
211 * params and __setups of same names 8( */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212 if (line[n] == '\0' || line[n] == '=')
Yaowei Bai31c025b2016-01-20 14:59:27 -0800213 had_early_param = true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214 } else if (!p->setup_func) {
Andrew Mortonea676e82013-04-29 16:18:20 -0700215 pr_warn("Parameter %s is obsolete, ignored\n",
216 p->str);
Yaowei Bai31c025b2016-01-20 14:59:27 -0800217 return true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218 } else if (p->setup_func(line + n))
Yaowei Bai31c025b2016-01-20 14:59:27 -0800219 return true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220 }
221 p++;
222 } while (p < __setup_end);
Rusty Russell33df0d12006-09-26 10:52:32 +0200223
224 return had_early_param;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225}
226
227/*
228 * This should be approx 2 Bo*oMips to start (note initial shift), and will
229 * still work even if initially too large, it will just take slightly longer
230 */
231unsigned long loops_per_jiffy = (1<<12);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232EXPORT_SYMBOL(loops_per_jiffy);
233
234static int __init debug_kernel(char *str)
235{
Borislav Petkova8fe19e2014-06-04 16:11:46 -0700236 console_loglevel = CONSOLE_LOGLEVEL_DEBUG;
Yinghai Luf6f21c812008-02-08 04:21:58 -0800237 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238}
239
240static int __init quiet_kernel(char *str)
241{
Borislav Petkova8fe19e2014-06-04 16:11:46 -0700242 console_loglevel = CONSOLE_LOGLEVEL_QUIET;
Yinghai Luf6f21c812008-02-08 04:21:58 -0800243 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244}
245
Yinghai Luf6f21c812008-02-08 04:21:58 -0800246early_param("debug", debug_kernel);
247early_param("quiet", quiet_kernel);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700248
249static int __init loglevel(char *str)
250{
Alexander Sverdlin808bf292011-09-21 09:51:40 +0200251 int newlevel;
252
253 /*
254 * Only update loglevel value when a correct setting was passed,
255 * to prevent blind crashes (when loglevel being set to 0) that
256 * are quite hard to debug
257 */
258 if (get_option(&str, &newlevel)) {
259 console_loglevel = newlevel;
260 return 0;
261 }
262
263 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264}
265
Yinghai Luf6f21c812008-02-08 04:21:58 -0800266early_param("loglevel", loglevel);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267
Masami Hiramatsude462e52020-04-26 15:53:30 +0900268#ifdef CONFIG_BLK_DEV_INITRD
269static void * __init get_boot_config_from_initrd(u32 *_size, u32 *_csum)
270{
271 u32 size, csum;
272 char *data;
273 u32 *hdr;
Masami Hiramatsu50b8a742020-11-13 02:27:31 +0900274 int i;
Masami Hiramatsude462e52020-04-26 15:53:30 +0900275
276 if (!initrd_end)
277 return NULL;
278
279 data = (char *)initrd_end - BOOTCONFIG_MAGIC_LEN;
Masami Hiramatsu50b8a742020-11-13 02:27:31 +0900280 /*
281 * Since Grub may align the size of initrd to 4, we must
282 * check the preceding 3 bytes as well.
283 */
284 for (i = 0; i < 4; i++) {
285 if (!memcmp(data, BOOTCONFIG_MAGIC, BOOTCONFIG_MAGIC_LEN))
286 goto found;
287 data--;
288 }
289 return NULL;
Masami Hiramatsude462e52020-04-26 15:53:30 +0900290
Masami Hiramatsu50b8a742020-11-13 02:27:31 +0900291found:
Masami Hiramatsude462e52020-04-26 15:53:30 +0900292 hdr = (u32 *)(data - 8);
Masami Hiramatsu24aed092020-11-20 11:29:04 +0900293 size = le32_to_cpu(hdr[0]);
294 csum = le32_to_cpu(hdr[1]);
Masami Hiramatsude462e52020-04-26 15:53:30 +0900295
296 data = ((void *)hdr) - size;
297 if ((unsigned long)data < initrd_start) {
298 pr_err("bootconfig size %d is greater than initrd size %ld\n",
299 size, initrd_end - initrd_start);
300 return NULL;
301 }
302
303 /* Remove bootconfig from initramfs/initrd */
304 initrd_end = (unsigned long)data;
305 if (_size)
306 *_size = size;
307 if (_csum)
308 *_csum = csum;
309
310 return data;
311}
312#else
313static void * __init get_boot_config_from_initrd(u32 *_size, u32 *_csum)
314{
315 return NULL;
316}
317#endif
318
Masami Hiramatsu7684b852020-01-11 01:03:44 +0900319#ifdef CONFIG_BOOT_CONFIG
Masami Hiramatsu51887d02020-01-11 01:04:43 +0900320
Jason Yana27026e2020-09-15 15:03:24 +0800321static char xbc_namebuf[XBC_KEYLEN_MAX] __initdata;
Masami Hiramatsu51887d02020-01-11 01:04:43 +0900322
323#define rest(dst, end) ((end) > (dst) ? (end) - (dst) : 0)
324
325static int __init xbc_snprint_cmdline(char *buf, size_t size,
326 struct xbc_node *root)
327{
328 struct xbc_node *knode, *vnode;
329 char *end = buf + size;
Masami Hiramatsu51887d02020-01-11 01:04:43 +0900330 const char *val;
331 int ret;
332
333 xbc_node_for_each_key_value(root, knode, val) {
334 ret = xbc_node_compose_key_after(root, knode,
335 xbc_namebuf, XBC_KEYLEN_MAX);
336 if (ret < 0)
337 return ret;
338
339 vnode = xbc_node_get_child(knode);
Masami Hiramatsu88b91372020-02-20 21:19:42 +0900340 if (!vnode) {
341 ret = snprintf(buf, rest(buf, end), "%s ", xbc_namebuf);
Masami Hiramatsu51887d02020-01-11 01:04:43 +0900342 if (ret < 0)
343 return ret;
344 buf += ret;
Masami Hiramatsu88b91372020-02-20 21:19:42 +0900345 continue;
Masami Hiramatsu51887d02020-01-11 01:04:43 +0900346 }
Masami Hiramatsu88b91372020-02-20 21:19:42 +0900347 xbc_array_for_each_value(vnode, val) {
348 ret = snprintf(buf, rest(buf, end), "%s=\"%s\" ",
349 xbc_namebuf, val);
350 if (ret < 0)
351 return ret;
352 buf += ret;
353 }
Masami Hiramatsu51887d02020-01-11 01:04:43 +0900354 }
355
356 return buf - (end - size);
357}
358#undef rest
359
360/* Make an extra command line under given key word */
361static char * __init xbc_make_cmdline(const char *key)
362{
363 struct xbc_node *root;
364 char *new_cmdline;
365 int ret, len = 0;
366
367 root = xbc_find_node(key);
368 if (!root)
369 return NULL;
370
371 /* Count required buffer size */
372 len = xbc_snprint_cmdline(NULL, 0, root);
373 if (len <= 0)
374 return NULL;
375
376 new_cmdline = memblock_alloc(len + 1, SMP_CACHE_BYTES);
377 if (!new_cmdline) {
378 pr_err("Failed to allocate memory for extra kernel cmdline.\n");
379 return NULL;
380 }
381
382 ret = xbc_snprint_cmdline(new_cmdline, len + 1, root);
383 if (ret < 0 || ret > len) {
384 pr_err("Failed to print extra kernel cmdline.\n");
385 return NULL;
386 }
387
388 return new_cmdline;
389}
390
Qiujun Huang08d9e682020-02-16 19:28:31 +0800391static u32 boot_config_checksum(unsigned char *p, u32 size)
Masami Hiramatsu7684b852020-01-11 01:03:44 +0900392{
393 u32 ret = 0;
394
395 while (size--)
396 ret += *p++;
397
398 return ret;
399}
400
Steven Rostedt (VMware)f61872b2020-02-07 19:07:37 -0500401static int __init bootconfig_params(char *param, char *val,
402 const char *unused, void *arg)
403{
404 if (strcmp(param, "bootconfig") == 0) {
405 bootconfig_found = true;
Steven Rostedt (VMware)f61872b2020-02-07 19:07:37 -0500406 }
407 return 0;
408}
409
Steven Rostedt (VMware)7495e092020-02-04 07:33:53 -0500410static void __init setup_boot_config(const char *cmdline)
Masami Hiramatsu7684b852020-01-11 01:03:44 +0900411{
Steven Rostedt (VMware)f61872b2020-02-07 19:07:37 -0500412 static char tmp_cmdline[COMMAND_LINE_SIZE] __initdata;
Masami Hiramatsu89b74ca2020-03-03 20:24:50 +0900413 const char *msg;
414 int pos;
Masami Hiramatsu7684b852020-01-11 01:03:44 +0900415 u32 size, csum;
Masami Hiramatsu477d0842020-08-04 11:52:13 +0900416 char *data, *copy, *err;
Masami Hiramatsua0057402020-02-05 22:50:23 +0900417 int ret;
Masami Hiramatsu7684b852020-01-11 01:03:44 +0900418
Masami Hiramatsu611d0a92020-05-11 10:39:24 +0900419 /* Cut out the bootconfig data even if we have no bootconfig option */
Masami Hiramatsude462e52020-04-26 15:53:30 +0900420 data = get_boot_config_from_initrd(&size, &csum);
Masami Hiramatsude462e52020-04-26 15:53:30 +0900421
Steven Rostedt (VMware)f61872b2020-02-07 19:07:37 -0500422 strlcpy(tmp_cmdline, boot_command_line, COMMAND_LINE_SIZE);
Masami Hiramatsu477d0842020-08-04 11:52:13 +0900423 err = parse_args("bootconfig", tmp_cmdline, NULL, 0, 0, 0, NULL,
424 bootconfig_params);
Steven Rostedt (VMware)f61872b2020-02-07 19:07:37 -0500425
Masami Hiramatsu477d0842020-08-04 11:52:13 +0900426 if (IS_ERR(err) || !bootconfig_found)
Masami Hiramatsu7684b852020-01-11 01:03:44 +0900427 return;
428
Masami Hiramatsu477d0842020-08-04 11:52:13 +0900429 /* parse_args() stops at '--' and returns an address */
430 if (err)
431 initargs_found = true;
432
Masami Hiramatsu611d0a92020-05-11 10:39:24 +0900433 if (!data) {
434 pr_err("'bootconfig' found on command line, but no bootconfig found\n");
435 return;
436 }
437
Steven Rostedt (VMware)7495e092020-02-04 07:33:53 -0500438 if (size >= XBC_DATA_MAX) {
439 pr_err("bootconfig size %d greater than max size %d\n",
440 size, XBC_DATA_MAX);
Masami Hiramatsu7684b852020-01-11 01:03:44 +0900441 return;
Steven Rostedt (VMware)7495e092020-02-04 07:33:53 -0500442 }
Masami Hiramatsu7684b852020-01-11 01:03:44 +0900443
Steven Rostedt (VMware)7495e092020-02-04 07:33:53 -0500444 if (boot_config_checksum((unsigned char *)data, size) != csum) {
445 pr_err("bootconfig checksum failed\n");
Masami Hiramatsu7684b852020-01-11 01:03:44 +0900446 return;
Steven Rostedt (VMware)7495e092020-02-04 07:33:53 -0500447 }
Masami Hiramatsu7684b852020-01-11 01:03:44 +0900448
449 copy = memblock_alloc(size + 1, SMP_CACHE_BYTES);
450 if (!copy) {
Masami Hiramatsue241d142020-02-05 22:49:54 +0900451 pr_err("Failed to allocate memory for bootconfig\n");
Masami Hiramatsu7684b852020-01-11 01:03:44 +0900452 return;
453 }
454
455 memcpy(copy, data, size);
456 copy[size] = '\0';
457
Masami Hiramatsu89b74ca2020-03-03 20:24:50 +0900458 ret = xbc_init(copy, &msg, &pos);
459 if (ret < 0) {
460 if (pos < 0)
461 pr_err("Failed to init bootconfig: %s.\n", msg);
462 else
463 pr_err("Failed to parse bootconfig: %s at %d.\n",
464 msg, pos);
465 } else {
Masami Hiramatsua0057402020-02-05 22:50:23 +0900466 pr_info("Load bootconfig: %d bytes %d nodes\n", size, ret);
Masami Hiramatsu51887d02020-01-11 01:04:43 +0900467 /* keys starting with "kernel." are passed via cmdline */
468 extra_command_line = xbc_make_cmdline("kernel");
Masami Hiramatsu1319916202020-01-11 01:04:55 +0900469 /* Also, "init." keys are init arguments */
470 extra_init_args = xbc_make_cmdline("init");
Masami Hiramatsu51887d02020-01-11 01:04:43 +0900471 }
Steven Rostedt (VMware)7495e092020-02-04 07:33:53 -0500472 return;
Masami Hiramatsu7684b852020-01-11 01:03:44 +0900473}
Masami Hiramatsude462e52020-04-26 15:53:30 +0900474
Masami Hiramatsu7684b852020-01-11 01:03:44 +0900475#else
Masami Hiramatsude462e52020-04-26 15:53:30 +0900476
477static void __init setup_boot_config(const char *cmdline)
478{
479 /* Remove bootconfig data from initrd */
480 get_boot_config_from_initrd(NULL, NULL);
481}
Masami Hiramatsud8a953d2020-02-20 21:18:33 +0900482
483static int __init warn_bootconfig(char *str)
484{
Shaokun Zhang36c6aa22020-05-09 16:33:55 +0800485 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 +0900486 return 0;
487}
488early_param("bootconfig", warn_bootconfig);
489
Masami Hiramatsu7684b852020-01-11 01:03:44 +0900490#endif
491
Chris Metcalfa99cd112012-04-06 12:53:50 -0400492/* Change NUL term back to "=", to make "param" the whole string. */
Arvind Sankar7e2762e2020-01-30 22:17:16 -0800493static void __init repair_env_string(char *param, char *val)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700494{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700495 if (val) {
496 /* param=val or param="val"? */
497 if (val == param+strlen(param)+1)
498 val[-1] = '=';
499 else if (val == param+strlen(param)+2) {
500 val[-2] = '=';
501 memmove(val-1, val, strlen(val)+1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700502 } else
503 BUG();
504 }
Chris Metcalfa99cd112012-04-06 12:53:50 -0400505}
506
Rusty Russell51e158c2014-04-28 11:34:33 +0930507/* Anything after -- gets handed straight to init. */
Luis R. Rodriguezecc86172015-03-30 16:20:03 -0700508static int __init set_init_arg(char *param, char *val,
509 const char *unused, void *arg)
Rusty Russell51e158c2014-04-28 11:34:33 +0930510{
511 unsigned int i;
512
513 if (panic_later)
514 return 0;
515
Arvind Sankar7e2762e2020-01-30 22:17:16 -0800516 repair_env_string(param, val);
Rusty Russell51e158c2014-04-28 11:34:33 +0930517
518 for (i = 0; argv_init[i]; i++) {
519 if (i == MAX_INIT_ARGS) {
520 panic_later = "init";
521 panic_param = param;
522 return 0;
523 }
524 }
525 argv_init[i] = param;
526 return 0;
527}
528
Chris Metcalfa99cd112012-04-06 12:53:50 -0400529/*
530 * Unknown boot options get handed to init, unless they look like
531 * unused parameters (modprobe will find them in /proc/cmdline).
532 */
Luis R. Rodriguezecc86172015-03-30 16:20:03 -0700533static int __init unknown_bootoption(char *param, char *val,
534 const char *unused, void *arg)
Chris Metcalfa99cd112012-04-06 12:53:50 -0400535{
Arvind Sankar283900e2020-01-30 22:17:19 -0800536 size_t len = strlen(param);
537
Arvind Sankar7e2762e2020-01-30 22:17:16 -0800538 repair_env_string(param, val);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700539
540 /* Handle obsolete-style parameters */
541 if (obsolete_checksetup(param))
542 return 0;
543
Rusty Russellf066a4f2009-12-01 14:56:44 +1030544 /* Unused module parameter. */
Arvind Sankar283900e2020-01-30 22:17:19 -0800545 if (strnchr(param, len, '.'))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700546 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700547
548 if (panic_later)
549 return 0;
550
551 if (val) {
552 /* Environment option */
553 unsigned int i;
554 for (i = 0; envp_init[i]; i++) {
555 if (i == MAX_INIT_ENVS) {
Tetsuo Handa499a4582014-01-23 15:54:56 -0800556 panic_later = "env";
Linus Torvalds1da177e2005-04-16 15:20:36 -0700557 panic_param = param;
558 }
Arvind Sankar283900e2020-01-30 22:17:19 -0800559 if (!strncmp(param, envp_init[i], len+1))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700560 break;
561 }
562 envp_init[i] = param;
563 } else {
564 /* Command line option */
565 unsigned int i;
566 for (i = 0; argv_init[i]; i++) {
567 if (i == MAX_INIT_ARGS) {
Tetsuo Handa499a4582014-01-23 15:54:56 -0800568 panic_later = "init";
Linus Torvalds1da177e2005-04-16 15:20:36 -0700569 panic_param = param;
570 }
571 }
572 argv_init[i] = param;
573 }
574 return 0;
575}
576
577static int __init init_setup(char *str)
578{
579 unsigned int i;
580
581 execute_command = str;
582 /*
583 * In case LILO is going to boot us with default command line,
584 * it prepends "auto" before the whole cmdline which makes
585 * the shell think it should execute a script with such name.
586 * So we ignore all arguments entered _before_ init=... [MJ]
587 */
588 for (i = 1; i < MAX_INIT_ARGS; i++)
589 argv_init[i] = NULL;
590 return 1;
591}
592__setup("init=", init_setup);
593
Olof Johanssonffdfc402005-09-06 15:17:19 -0700594static int __init rdinit_setup(char *str)
595{
596 unsigned int i;
597
598 ramdisk_execute_command = str;
599 /* See "auto" comment in init_setup */
600 for (i = 1; i < MAX_INIT_ARGS; i++)
601 argv_init[i] = NULL;
602 return 1;
603}
604__setup("rdinit=", rdinit_setup);
605
Linus Torvalds1da177e2005-04-16 15:20:36 -0700606#ifndef CONFIG_SMP
Amerigo Wang34db18a02011-03-22 16:34:06 -0700607static const unsigned int setup_max_cpus = NR_CPUS;
Mike Travise0982e92008-03-26 14:23:48 -0700608static inline void setup_nr_cpu_ids(void) { }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700609static inline void smp_prepare_cpus(unsigned int maxcpus) { }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700610#endif
611
612/*
Alon Bar-Lev30d7e0d2007-02-12 00:53:52 -0800613 * We need to store the untouched command line for future reference.
614 * We also need to store the touched command line since the parameter
615 * parsing is performed in place, and we should allow a component to
616 * store reference of name/value for future reference.
617 */
618static void __init setup_command_line(char *command_line)
619{
Masami Hiramatsu1319916202020-01-11 01:04:55 +0900620 size_t len, xlen = 0, ilen = 0;
Mike Rapoportf5c73102019-03-11 23:30:20 -0700621
Masami Hiramatsu51887d02020-01-11 01:04:43 +0900622 if (extra_command_line)
623 xlen = strlen(extra_command_line);
Masami Hiramatsu1319916202020-01-11 01:04:55 +0900624 if (extra_init_args)
625 ilen = strlen(extra_init_args) + 4; /* for " -- " */
Masami Hiramatsu51887d02020-01-11 01:04:43 +0900626
627 len = xlen + strlen(boot_command_line) + 1;
Mike Rapoportf5c73102019-03-11 23:30:20 -0700628
Masami Hiramatsu1319916202020-01-11 01:04:55 +0900629 saved_command_line = memblock_alloc(len + ilen, SMP_CACHE_BYTES);
Mike Rapoportf5c73102019-03-11 23:30:20 -0700630 if (!saved_command_line)
Masami Hiramatsu1319916202020-01-11 01:04:55 +0900631 panic("%s: Failed to allocate %zu bytes\n", __func__, len + ilen);
Mike Rapoportf5c73102019-03-11 23:30:20 -0700632
633 static_command_line = memblock_alloc(len, SMP_CACHE_BYTES);
634 if (!static_command_line)
635 panic("%s: Failed to allocate %zu bytes\n", __func__, len);
636
Masami Hiramatsu51887d02020-01-11 01:04:43 +0900637 if (xlen) {
638 /*
639 * We have to put extra_command_line before boot command
640 * lines because there could be dashes (separator of init
641 * command line) in the command lines.
642 */
643 strcpy(saved_command_line, extra_command_line);
644 strcpy(static_command_line, extra_command_line);
645 }
646 strcpy(saved_command_line + xlen, boot_command_line);
647 strcpy(static_command_line + xlen, command_line);
Masami Hiramatsu1319916202020-01-11 01:04:55 +0900648
649 if (ilen) {
650 /*
651 * Append supplemental init boot args to saved_command_line
652 * so that user can check what command line options passed
653 * to init.
654 */
655 len = strlen(saved_command_line);
Steven Rostedt (VMware)f61872b2020-02-07 19:07:37 -0500656 if (initargs_found) {
657 saved_command_line[len++] = ' ';
658 } else {
Masami Hiramatsu1319916202020-01-11 01:04:55 +0900659 strcpy(saved_command_line + len, " -- ");
660 len += 4;
Steven Rostedt (VMware)f61872b2020-02-07 19:07:37 -0500661 }
Masami Hiramatsu1319916202020-01-11 01:04:55 +0900662
663 strcpy(saved_command_line + len, extra_init_args);
664 }
Alon Bar-Lev30d7e0d2007-02-12 00:53:52 -0800665}
666
667/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700668 * We need to finalize in a non-__init function or else race conditions
669 * between the root thread and the init thread may cause start_kernel to
670 * be reaped by free_initmem before the root thread has proceeded to
671 * cpu_idle.
672 *
673 * gcc-3.4 accidentally inlines this function, so use noinline.
674 */
675
Peter Zijlstrab433c3d2010-06-28 16:51:01 +0200676static __initdata DECLARE_COMPLETION(kthreadd_done);
677
Martin Schwidefsky53c99bd62018-08-31 10:42:24 +0200678noinline void __ref rest_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700679{
Thomas Gleixner8fb12152017-05-16 20:42:32 +0200680 struct task_struct *tsk;
Eric W. Biederman73c27992007-05-09 02:34:32 -0700681 int pid;
682
Paul E. McKenney7db905e2009-09-02 14:01:24 -0700683 rcu_scheduler_starting();
Peter Zijlstrab433c3d2010-06-28 16:51:01 +0200684 /*
Peter Zijlstra97158562010-06-30 10:37:11 +0200685 * We need to spawn init first so that it obtains pid 1, however
Peter Zijlstrab433c3d2010-06-28 16:51:01 +0200686 * the init task will end up wanting to create kthreads, which, if
687 * we schedule it before we create kthreadd, will OOPS.
688 */
Thomas Gleixner8fb12152017-05-16 20:42:32 +0200689 pid = kernel_thread(kernel_init, NULL, CLONE_FS);
690 /*
691 * Pin init on the boot CPU. Task migration is not properly working
692 * until sched_init_smp() has been run. It will set the allowed
693 * CPUs for init to the non isolated CPUs.
694 */
695 rcu_read_lock();
696 tsk = find_task_by_pid_ns(pid, &init_pid_ns);
697 set_cpus_allowed_ptr(tsk, cpumask_of(smp_processor_id()));
698 rcu_read_unlock();
699
Linus Torvalds1da177e2005-04-16 15:20:36 -0700700 numa_default_policy();
Eric W. Biederman73c27992007-05-09 02:34:32 -0700701 pid = kernel_thread(kthreadd, NULL, CLONE_FS | CLONE_FILES);
Paul E. McKenneyd11c5632010-02-22 17:04:50 -0800702 rcu_read_lock();
Pavel Emelyanov5cd20452008-04-30 00:54:24 -0700703 kthreadd_task = find_task_by_pid_ns(pid, &init_pid_ns);
Paul E. McKenneyd11c5632010-02-22 17:04:50 -0800704 rcu_read_unlock();
Thomas Gleixner1c3c5ea2017-05-16 20:42:48 +0200705
706 /*
707 * Enable might_sleep() and smp_processor_id() checks.
Thomas Gleixnerc1a280b2019-07-26 23:19:37 +0200708 * They cannot be enabled earlier because with CONFIG_PREEMPTION=y
Thomas Gleixner1c3c5ea2017-05-16 20:42:48 +0200709 * kernel_thread() would trigger might_sleep() splats. With
710 * CONFIG_PREEMPT_VOLUNTARY=y the init task might have scheduled
711 * already, but it's stuck on the kthreadd_done completion.
712 */
713 system_state = SYSTEM_SCHEDULING;
714
Peter Zijlstrab433c3d2010-06-28 16:51:01 +0200715 complete(&kthreadd_done);
Ingo Molnarf340c0d2005-06-28 16:40:42 +0200716
717 /*
718 * The boot idle thread must execute schedule()
Ingo Molnar1df21052007-07-09 18:51:58 +0200719 * at least once to get things moving:
Ingo Molnarf340c0d2005-06-28 16:40:42 +0200720 */
Thomas Gleixnerbd2f5532011-03-21 12:33:18 +0100721 schedule_preempt_disabled();
Nick Piggin5bfb5d62005-11-08 21:39:01 -0800722 /* Call into cpu_idle with preempt disabled */
Thomas Gleixnera1a04ec2013-03-21 22:49:34 +0100723 cpu_startup_entry(CPUHP_ONLINE);
Ingo Molnar1df21052007-07-09 18:51:58 +0200724}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700725
726/* Check for early params. */
Luis R. Rodriguezecc86172015-03-30 16:20:03 -0700727static int __init do_early_param(char *param, char *val,
728 const char *unused, void *arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700729{
Rusty Russell914dcaa2010-08-11 23:04:18 -0600730 const struct obs_kernel_param *p;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700731
732 for (p = __setup_start; p < __setup_end; p++) {
Michal Schmidtb1e4d202011-10-10 00:03:37 +0200733 if ((p->early && parameq(param, p->str)) ||
Yinghai Lu18a8bd92007-07-15 23:37:59 -0700734 (strcmp(param, "console") == 0 &&
735 strcmp(p->str, "earlycon") == 0)
736 ) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700737 if (p->setup_func(val) != 0)
Andrew Mortonea676e82013-04-29 16:18:20 -0700738 pr_warn("Malformed early option '%s'\n", param);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700739 }
740 }
741 /* We accept everything at this stage. */
742 return 0;
743}
744
Magnus Damm13977092009-03-30 14:37:25 -0700745void __init parse_early_options(char *cmdline)
746{
Luis R. Rodriguezecc86172015-03-30 16:20:03 -0700747 parse_args("early options", cmdline, NULL, 0, 0, 0, NULL,
748 do_early_param);
Magnus Damm13977092009-03-30 14:37:25 -0700749}
750
Linus Torvalds1da177e2005-04-16 15:20:36 -0700751/* Arch code calls this early on, or if not, just before other parsing. */
752void __init parse_early_param(void)
753{
Fabian Frederickdd4d9fe2014-08-08 14:23:44 -0700754 static int done __initdata;
755 static char tmp_cmdline[COMMAND_LINE_SIZE] __initdata;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700756
757 if (done)
758 return;
759
760 /* All fall through to do_early_param. */
Alon Bar-Lev30d7e0d2007-02-12 00:53:52 -0800761 strlcpy(tmp_cmdline, boot_command_line, COMMAND_LINE_SIZE);
Magnus Damm13977092009-03-30 14:37:25 -0700762 parse_early_options(tmp_cmdline);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700763 done = 1;
764}
765
Thomas Gleixnere7ff3a42016-12-09 19:29:10 +0100766void __init __weak arch_post_acpi_subsys_init(void) { }
767
Benjamin Herrenschmidt839ad622008-04-18 16:56:18 +1000768void __init __weak smp_setup_processor_id(void)
Andrew Morton033ab7f2006-06-30 01:55:50 -0700769{
770}
771
David Howellseded09c2012-11-02 13:20:42 +0000772# if THREAD_SIZE >= PAGE_SIZE
Linus Torvaldsb235bee2016-06-24 15:09:37 -0700773void __init __weak thread_stack_cache_init(void)
Benjamin Herrenschmidt8c9843e2008-04-18 16:56:15 +1000774{
775}
David Howellseded09c2012-11-02 13:20:42 +0000776#endif
Benjamin Herrenschmidt8c9843e2008-04-18 16:56:15 +1000777
Tom Lendackyc7753202017-07-17 16:10:21 -0500778void __init __weak mem_encrypt_init(void) { }
779
Nadav Amit4fc19702019-04-26 16:22:46 -0700780void __init __weak poking_init(void) { }
781
Mike Rapoport782de702019-09-23 15:35:31 -0700782void __init __weak pgtable_cache_init(void) { }
Nadav Amitcaa84132019-05-04 18:11:24 -0700783
Steven Rostedt (VMware)4e379582018-03-26 13:31:07 -0400784bool initcall_debug;
785core_param(initcall_debug, initcall_debug, bool, 0644);
Steven Rostedt (VMware)b0dc52f2018-04-06 09:24:25 -0400786
787#ifdef TRACEPOINTS_ENABLED
Steven Rostedt (VMware)4e379582018-03-26 13:31:07 -0400788static void __init initcall_debug_enable(void);
Steven Rostedt (VMware)b0dc52f2018-04-06 09:24:25 -0400789#else
790static inline void initcall_debug_enable(void)
791{
792}
793#endif
Steven Rostedt (VMware)4e379582018-03-26 13:31:07 -0400794
Alexander Potapenko23a5c8c2019-07-11 20:59:23 -0700795/* Report memory auto-initialization states for this boot. */
796static void __init report_meminit(void)
797{
798 const char *stack;
799
glider@google.comf0fe00d2020-06-16 10:34:35 +0200800 if (IS_ENABLED(CONFIG_INIT_STACK_ALL_PATTERN))
801 stack = "all(pattern)";
802 else if (IS_ENABLED(CONFIG_INIT_STACK_ALL_ZERO))
803 stack = "all(zero)";
Alexander Potapenko23a5c8c2019-07-11 20:59:23 -0700804 else if (IS_ENABLED(CONFIG_GCC_PLUGIN_STRUCTLEAK_BYREF_ALL))
glider@google.comf0fe00d2020-06-16 10:34:35 +0200805 stack = "byref_all(zero)";
Alexander Potapenko23a5c8c2019-07-11 20:59:23 -0700806 else if (IS_ENABLED(CONFIG_GCC_PLUGIN_STRUCTLEAK_BYREF))
glider@google.comf0fe00d2020-06-16 10:34:35 +0200807 stack = "byref(zero)";
Alexander Potapenko23a5c8c2019-07-11 20:59:23 -0700808 else if (IS_ENABLED(CONFIG_GCC_PLUGIN_STRUCTLEAK_USER))
glider@google.comf0fe00d2020-06-16 10:34:35 +0200809 stack = "__user(zero)";
Alexander Potapenko23a5c8c2019-07-11 20:59:23 -0700810 else
811 stack = "off";
812
813 pr_info("mem auto-init: stack:%s, heap alloc:%s, heap free:%s\n",
814 stack, want_init_on_alloc(GFP_KERNEL) ? "on" : "off",
815 want_init_on_free() ? "on" : "off");
816 if (want_init_on_free())
817 pr_info("mem auto-init: clearing system memory may take some time...\n");
818}
819
Pekka Enberg444f4782009-06-11 18:29:06 +0300820/*
821 * Set up kernel memory allocators
822 */
823static void __init mm_init(void)
824{
Joonsoo Kimeefa864b2014-12-12 16:55:46 -0800825 /*
826 * page_ext requires contiguous pages,
827 * bigger than MAX_ORDER unless SPARSEMEM.
828 */
829 page_ext_init_flatmem();
Vlastimil Babka8e57f8a2020-01-13 16:29:20 -0800830 init_debug_pagealloc();
Alexander Potapenkoadb54c72021-01-22 09:18:31 +0000831 kfence_alloc_pool();
Alexander Potapenko23a5c8c2019-07-11 20:59:23 -0700832 report_meminit();
Vijayanand Jittabfed1c32021-02-12 17:14:55 +1100833 stack_depot_init();
Pekka Enberg444f4782009-06-11 18:29:06 +0300834 mem_init();
835 kmem_cache_init();
Catalin Marinasc5665862019-09-23 15:34:05 -0700836 kmemleak_init();
Kirill A. Shutemovb35f1812014-01-21 15:49:07 -0800837 pgtable_init();
Qian Caia9ee3a62018-12-28 00:32:32 -0800838 debug_objects_mem_init();
Pekka Enberg444f4782009-06-11 18:29:06 +0300839 vmalloc_init();
Toshi Kani0ddab1d2015-04-14 15:47:20 -0700840 ioremap_huge_init();
Thomas Gleixner613e3962017-12-17 10:56:29 +0100841 /* Should be run before the first non-init thread is created */
842 init_espfix_bsp();
Thomas Gleixneraa8c6242017-12-04 15:07:36 +0100843 /* Should be run after espfix64 is set up. */
844 pti_init();
Pekka Enberg444f4782009-06-11 18:29:06 +0300845}
846
Martin Schwidefsky53c99bd62018-08-31 10:42:24 +0200847void __init __weak arch_call_rest_init(void)
848{
849 rest_init();
850}
851
Andrey Konovalovf9409d52020-08-06 23:25:05 -0700852asmlinkage __visible void __init __no_sanitize_address start_kernel(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700853{
Fabian Frederickdd4d9fe2014-08-08 14:23:44 -0700854 char *command_line;
855 char *after_dashes;
Andrew Morton033ab7f2006-06-30 01:55:50 -0700856
Aaron Tomlind4311ff2014-09-12 14:16:17 +0100857 set_task_stack_end_magic(&init_task);
Ming Lei73839c52011-11-17 13:34:31 +0800858 smp_setup_processor_id();
Thomas Gleixner3ac7fe52008-04-30 00:55:01 -0700859 debug_objects_early_init();
Ingo Molnar42059422008-02-14 09:44:08 +0100860
Paul Menageddbcc7e2007-10-18 23:39:30 -0700861 cgroup_init_early();
Ingo Molnarfbb9ce952006-07-03 00:24:50 -0700862
863 local_irq_disable();
Tejun Heo2ce802f2011-01-20 12:06:35 +0100864 early_boot_irqs_disabled = true;
Ingo Molnarfbb9ce952006-07-03 00:24:50 -0700865
Viresh Kumar1b3b3b42017-03-23 17:00:05 +0530866 /*
867 * Interrupts are still disabled. Do necessary setups, then
868 * enable them.
869 */
Stas Sergeev44fd2292006-03-23 02:59:44 -0800870 boot_cpu_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700871 page_address_init();
Andrew Mortonea676e82013-04-29 16:18:20 -0700872 pr_notice("%s", linux_banner);
Matthew Garrette6b1db92019-08-19 17:17:37 -0700873 early_security_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700874 setup_arch(&command_line);
Steven Rostedt (VMware)7495e092020-02-04 07:33:53 -0500875 setup_boot_config(command_line);
Alon Bar-Lev30d7e0d2007-02-12 00:53:52 -0800876 setup_command_line(command_line);
Mike Travise0982e92008-03-26 14:23:48 -0700877 setup_nr_cpu_ids();
Tejun Heod6647bd2009-07-21 17:11:50 +0900878 setup_per_cpu_areas();
Stas Sergeev44fd2292006-03-23 02:59:44 -0800879 smp_prepare_boot_cpu(); /* arch-specific boot-cpu hooks */
Linus Torvaldsb5b14042018-08-12 12:19:42 -0700880 boot_cpu_hotplug_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700881
Michal Hocko72675e12017-09-06 16:20:24 -0700882 build_all_zonelists(NULL);
Pekka Enberg83b519e2009-06-10 19:40:04 +0300883 page_alloc_init();
884
Tao Huangabe8f1c2018-08-20 19:38:38 +0800885#ifdef CONFIG_ARCH_ROCKCHIP
886 {
887 const char *s = saved_command_line;
888 const char *e = &saved_command_line[strlen(saved_command_line)];
889 int n =
890 pr_notice("Kernel command line: %s\n", saved_command_line);
891 n -= strlen("Kernel command line: ");
892 s += n;
893 /* command line maybe too long to print one time */
894 while (n > 0 && s < e) {
895 n = pr_cont("%s\n", s);
896 s += n;
897 }
898 }
899#else
Masami Hiramatsu51887d02020-01-11 01:04:43 +0900900 pr_notice("Kernel command line: %s\n", saved_command_line);
Tao Huangabe8f1c2018-08-20 19:38:38 +0800901#endif
Dan Williams60411862019-04-18 17:50:44 -0700902 /* parameters may set static keys */
903 jump_label_init();
Pekka Enberg83b519e2009-06-10 19:40:04 +0300904 parse_early_param();
Rusty Russell51e158c2014-04-28 11:34:33 +0930905 after_dashes = parse_args("Booting kernel",
906 static_command_line, __start___param,
907 __stop___param - __start___param,
Luis R. Rodriguezecc86172015-03-30 16:20:03 -0700908 -1, -1, NULL, &unknown_bootoption);
Daniel Thompson3438cf52014-11-11 16:29:46 +1030909 if (!IS_ERR_OR_NULL(after_dashes))
Rusty Russell51e158c2014-04-28 11:34:33 +0930910 parse_args("Setting init args", after_dashes, NULL, 0, -1, -1,
Luis R. Rodriguezecc86172015-03-30 16:20:03 -0700911 NULL, set_init_arg);
Masami Hiramatsu1319916202020-01-11 01:04:55 +0900912 if (extra_init_args)
913 parse_args("Setting extra init args", extra_init_args,
914 NULL, 0, -1, -1, NULL, set_init_arg);
Jeremy Fitzhardinge97ce2c82011-10-12 16:17:54 -0700915
Pekka Enberg83b519e2009-06-10 19:40:04 +0300916 /*
917 * These use large bootmem allocations and must precede
918 * kmem_cache_init()
919 */
Mike Travis162a7e72011-05-24 17:13:20 -0700920 setup_log_buf(0);
Pekka Enberg83b519e2009-06-10 19:40:04 +0300921 vfs_caches_init_early();
922 sort_main_extable();
923 trap_init();
Pekka Enberg444f4782009-06-11 18:29:06 +0300924 mm_init();
KOSAKI Motohirode03c722011-05-24 17:12:15 -0700925
Steven Rostedt (VMware)f6317182017-03-03 13:43:34 -0500926 ftrace_init();
927
Steven Rostedt (VMware)e725c732017-03-03 13:37:33 -0500928 /* trace_printk can be enabled here */
929 early_trace_init();
930
Linus Torvalds1da177e2005-04-16 15:20:36 -0700931 /*
932 * Set up the scheduler prior starting any interrupts (such as the
933 * timer interrupt). Full topology setup happens at smp_init()
934 * time - but meanwhile we still have a functioning scheduler.
935 */
936 sched_init();
937 /*
938 * Disable preemption - early bootup scheduling is extremely
939 * fragile until we cpu_idle() for the first time.
940 */
941 preempt_disable();
Fabian Frederickdd4d9fe2014-08-08 14:23:44 -0700942 if (WARN(!irqs_disabled(),
943 "Interrupts were enabled *very* early, fixing it\n"))
Ard van Breemenc4a68302007-01-05 16:36:19 -0800944 local_irq_disable();
Matthew Wilcox0a835c42016-12-20 10:27:56 -0500945 radix_tree_init();
Tejun Heo3347fa02016-09-16 15:49:32 -0400946
947 /*
Tal Shorer7d229c62017-11-03 17:27:49 +0200948 * Set up housekeeping before setting up workqueues to allow the unbound
949 * workqueue to take non-housekeeping into account.
950 */
951 housekeeping_init();
952
953 /*
Tejun Heo3347fa02016-09-16 15:49:32 -0400954 * Allow workqueue creation and work item queueing/cancelling
955 * early. Work item execution depends on kthreads and starts after
956 * workqueue_init().
957 */
958 workqueue_init_early();
959
Linus Torvalds1da177e2005-04-16 15:20:36 -0700960 rcu_init();
Steven Rostedt (Red Hat)5f893b22014-12-12 20:05:10 -0500961
Steven Rostedt (VMware)e725c732017-03-03 13:37:33 -0500962 /* Trace events are available after this */
Steven Rostedt (Red Hat)5f893b22014-12-12 20:05:10 -0500963 trace_init();
964
Steven Rostedt (VMware)4e379582018-03-26 13:31:07 -0400965 if (initcall_debug)
966 initcall_debug_enable();
967
Frederic Weisbecker65f382f2013-07-11 19:12:32 +0200968 context_tracking_init();
Yinghai Lu0b8f1ef2008-12-05 18:58:31 -0800969 /* init some links before init_ISA_irqs() */
970 early_irq_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700971 init_IRQ();
Thomas Gleixnerad2b1352013-03-05 15:14:05 +0100972 tick_init();
Linus Torvaldsd6dd50e2014-10-13 15:44:12 +0200973 rcu_init_nohz();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700974 init_timers();
Thomas Gleixnerc0a31322006-01-09 20:52:32 -0800975 hrtimers_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700976 softirq_init();
john stultzad596172006-06-26 00:25:06 -0700977 timekeeping_init();
Alexander Potapenkoadb54c72021-01-22 09:18:31 +0000978 kfence_init();
Kees Cookd5553522019-04-19 23:27:05 -0400979
980 /*
981 * For best initial stack canary entropy, prepare it after:
982 * - setup_arch() for any UEFI RNG entropy and boot cmdline access
983 * - timekeeping_init() for ktime entropy used in rand_initialize()
984 * - rand_initialize() to get any arch-specific entropy like RDRAND
985 * - add_latent_entropy() to get any latent entropy
986 * - adding command line entropy
987 */
988 rand_initialize();
989 add_latent_entropy();
990 add_device_randomness(command_line, strlen(command_line));
991 boot_init_stack_canary();
992
john stultz88fecaa2006-07-03 00:24:04 -0700993 time_init();
Stephane Eranian9e630202013-04-03 14:21:33 +0200994 perf_event_init();
Heiko Carstens93e02812006-07-03 00:24:24 -0700995 profile_init();
Takao Indohd8ad7d12011-03-29 12:35:04 -0400996 call_function_init();
Steven Rostedtf91eb622013-04-29 16:18:18 -0700997 WARN(!irqs_disabled(), "Interrupts were enabled early\n");
Joel Fernandes (Google)c3bc8fd2018-07-30 15:24:23 -0700998
Tejun Heo2ce802f2011-01-20 12:06:35 +0100999 early_boot_irqs_disabled = false;
Heiko Carstens93e02812006-07-03 00:24:24 -07001000 local_irq_enable();
Benjamin Herrenschmidtdcce2842009-06-18 13:24:12 +10001001
Pekka Enberg7e85ee02009-06-12 14:03:06 +03001002 kmem_cache_init_late();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001003
1004 /*
1005 * HACK ALERT! This is early. We're enabling the console before
1006 * we've done PCI setups etc, and console_init() must be aware of
1007 * this. But we do want output early, in case something goes wrong.
1008 */
1009 console_init();
1010 if (panic_later)
Tetsuo Handa499a4582014-01-23 15:54:56 -08001011 panic("Too many boot %s vars at `%s'", panic_later,
1012 panic_param);
Ingo Molnarfbb9ce952006-07-03 00:24:50 -07001013
Joel Fernandes (Google)c3bc8fd2018-07-30 15:24:23 -07001014 lockdep_init();
Ingo Molnarfbb9ce952006-07-03 00:24:50 -07001015
Ingo Molnar9a11b49a2006-07-03 00:24:33 -07001016 /*
1017 * Need to run this when irqs are enabled, because it wants
1018 * to self-test [hard/soft]-irqs on/off lock inversion bugs
1019 * too:
1020 */
1021 locking_selftest();
1022
Tom Lendackyc7753202017-07-17 16:10:21 -05001023 /*
1024 * This needs to be called before any devices perform DMA
1025 * operations that might use the SWIOTLB bounce buffers. It will
1026 * mark the bounce buffers as decrypted so that their usage will
1027 * not cause "plain-text" data to be decrypted when accessed.
1028 */
1029 mem_encrypt_init();
1030
Linus Torvalds1da177e2005-04-16 15:20:36 -07001031#ifdef CONFIG_BLK_DEV_INITRD
1032 if (initrd_start && !initrd_below_start_ok &&
Geert Uytterhoevenbd673c72008-07-29 22:33:36 -07001033 page_to_pfn(virt_to_page((void *)initrd_start)) < min_low_pfn) {
Andrew Mortonea676e82013-04-29 16:18:20 -07001034 pr_crit("initrd overwritten (0x%08lx < 0x%08lx) - disabling it.\n",
Geert Uytterhoevenbd673c72008-07-29 22:33:36 -07001035 page_to_pfn(virt_to_page((void *)initrd_start)),
1036 min_low_pfn);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001037 initrd_start = 0;
1038 }
1039#endif
Christoph Lametere7c8d5c2005-06-21 17:14:47 -07001040 setup_per_cpu_pageset();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001041 numa_policy_init();
Dou Liyang9c712062017-09-13 17:17:54 +08001042 acpi_early_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001043 if (late_time_init)
1044 late_time_init();
Pavel Tatashin857baa82018-07-19 16:55:42 -04001045 sched_clock_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001046 calibrate_delay();
Gargi Sharma95846ec2017-11-17 15:30:30 -08001047 pid_idr_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001048 anon_vma_init();
Linus Torvalds11520e52012-12-15 15:15:24 -08001049#ifdef CONFIG_X86
Matt Fleming83e68182012-11-14 09:42:35 +00001050 if (efi_enabled(EFI_RUNTIME_SERVICES))
Linus Torvalds11520e52012-12-15 15:15:24 -08001051 efi_enter_virtual_mode();
1052#endif
Linus Torvaldsb235bee2016-06-24 15:09:37 -07001053 thread_stack_cache_init();
David Howellsd84f4f92008-11-14 10:39:23 +11001054 cred_init();
Heinrich Schuchardtff691f62015-04-16 12:47:44 -07001055 fork_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001056 proc_caches_init();
Alexey Dobriyan3ea056c2018-04-10 16:32:36 -07001057 uts_ns_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001058 buffer_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001059 key_init();
1060 security_init();
Jason Wessel0b4b3822010-05-20 21:04:29 -05001061 dbg_late_init();
Mel Gorman4248b0d2015-08-06 15:46:20 -07001062 vfs_caches_init();
Nicholas Piggin62906022016-12-25 13:00:30 +10001063 pagecache_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001064 signals_init();
Alexey Dobriyan0965232032018-04-10 16:34:45 -07001065 seq_file_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001066 proc_root_init();
Al Viroe149ed22014-11-01 10:57:28 -04001067 nsfs_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001068 cpuset_init();
Zefan Li695df212015-03-04 17:09:33 +08001069 cgroup_init();
Shailabh Nagarc7572492006-07-14 00:24:40 -07001070 taskstats_init_early();
Shailabh Nagarca74e922006-07-14 00:24:36 -07001071 delayacct_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001072
Nadav Amit4fc19702019-04-26 16:22:46 -07001073 poking_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001074 check_bugs();
1075
Rafael J. Wysockib064a8f2015-06-10 01:33:36 +02001076 acpi_subsystem_init();
Thomas Gleixnere7ff3a42016-12-09 19:29:10 +01001077 arch_post_acpi_subsys_init();
Feng Tang6ae69962009-08-14 15:13:46 -04001078 sfi_init_late();
Marco Elverdfd402a2019-11-14 19:02:54 +01001079 kcsan_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001080
1081 /* Do the rest non-__init'ed, we're now alive */
Martin Schwidefsky53c99bd62018-08-31 10:42:24 +02001082 arch_call_rest_init();
Borislav Petkova9a3ed12020-04-22 18:11:30 +02001083
1084 prevent_tail_call_optimization();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001085}
1086
Peter Oberparleiterb99b87f2009-06-17 16:28:03 -07001087/* Call all constructor functions linked into the kernel. */
1088static void __init do_ctors(void)
1089{
1090#ifdef CONFIG_CONSTRUCTORS
H Hartley Sweeten196a15b2009-12-14 18:00:18 -08001091 ctor_fn_t *fn = (ctor_fn_t *) __ctors_start;
Peter Oberparleiterb99b87f2009-06-17 16:28:03 -07001092
H Hartley Sweeten196a15b2009-12-14 18:00:18 -08001093 for (; fn < (ctor_fn_t *) __ctors_end; fn++)
1094 (*fn)();
Peter Oberparleiterb99b87f2009-06-17 16:28:03 -07001095#endif
1096}
1097
Prarit Bhargava7b0b73d2014-06-04 16:12:17 -07001098#ifdef CONFIG_KALLSYMS
1099struct blacklist_entry {
1100 struct list_head next;
1101 char *buf;
1102};
1103
1104static __initdata_or_module LIST_HEAD(blacklisted_initcalls);
1105
1106static int __init initcall_blacklist(char *str)
1107{
1108 char *str_entry;
1109 struct blacklist_entry *entry;
1110
1111 /* str argument is a comma-separated list of functions */
1112 do {
1113 str_entry = strsep(&str, ",");
1114 if (str_entry) {
1115 pr_debug("blacklisting initcall %s\n", str_entry);
Mike Rapoport7e1c4e22018-10-30 15:09:57 -07001116 entry = memblock_alloc(sizeof(*entry),
1117 SMP_CACHE_BYTES);
Mike Rapoportf5c73102019-03-11 23:30:20 -07001118 if (!entry)
1119 panic("%s: Failed to allocate %zu bytes\n",
1120 __func__, sizeof(*entry));
Mike Rapoport7e1c4e22018-10-30 15:09:57 -07001121 entry->buf = memblock_alloc(strlen(str_entry) + 1,
1122 SMP_CACHE_BYTES);
Mike Rapoportf5c73102019-03-11 23:30:20 -07001123 if (!entry->buf)
1124 panic("%s: Failed to allocate %zu bytes\n",
1125 __func__, strlen(str_entry) + 1);
Prarit Bhargava7b0b73d2014-06-04 16:12:17 -07001126 strcpy(entry->buf, str_entry);
1127 list_add(&entry->next, &blacklisted_initcalls);
1128 }
1129 } while (str_entry);
1130
1131 return 0;
1132}
1133
1134static bool __init_or_module initcall_blacklisted(initcall_t fn)
1135{
Prarit Bhargava7b0b73d2014-06-04 16:12:17 -07001136 struct blacklist_entry *entry;
Rasmus Villemoesc8cdd2b2016-05-20 17:04:27 -07001137 char fn_name[KSYM_SYMBOL_LEN];
Rasmus Villemoes0fd5ed82016-06-24 14:50:30 -07001138 unsigned long addr;
Prarit Bhargava7b0b73d2014-06-04 16:12:17 -07001139
Rasmus Villemoesc8cdd2b2016-05-20 17:04:27 -07001140 if (list_empty(&blacklisted_initcalls))
Prarit Bhargava7b0b73d2014-06-04 16:12:17 -07001141 return false;
1142
Rasmus Villemoes0fd5ed82016-06-24 14:50:30 -07001143 addr = (unsigned long) dereference_function_descriptor(fn);
1144 sprint_symbol_no_offset(fn_name, addr);
Rasmus Villemoesc8cdd2b2016-05-20 17:04:27 -07001145
Prarit Bhargava841c06d2016-08-02 14:07:15 -07001146 /*
1147 * fn will be "function_name [module_name]" where [module_name] is not
1148 * displayed for built-in init functions. Strip off the [module_name].
1149 */
1150 strreplace(fn_name, ' ', '\0');
1151
Geliang Tange6fd1fb2016-03-15 14:52:46 -07001152 list_for_each_entry(entry, &blacklisted_initcalls, next) {
Prarit Bhargava7b0b73d2014-06-04 16:12:17 -07001153 if (!strcmp(fn_name, entry->buf)) {
1154 pr_debug("initcall %s blacklisted\n", fn_name);
Prarit Bhargava7b0b73d2014-06-04 16:12:17 -07001155 return true;
1156 }
1157 }
1158
Prarit Bhargava7b0b73d2014-06-04 16:12:17 -07001159 return false;
1160}
1161#else
1162static int __init initcall_blacklist(char *str)
1163{
1164 pr_warn("initcall_blacklist requires CONFIG_KALLSYMS\n");
1165 return 0;
1166}
1167
1168static bool __init_or_module initcall_blacklisted(initcall_t fn)
1169{
1170 return false;
1171}
1172#endif
1173__setup("initcall_blacklist=", initcall_blacklist);
1174
Steven Rostedt (VMware)4e379582018-03-26 13:31:07 -04001175static __init_or_module void
1176trace_initcall_start_cb(void *data, initcall_t fn)
Linus Torvaldse0df1542008-05-15 18:14:01 -07001177{
Steven Rostedt (VMware)4e379582018-03-26 13:31:07 -04001178 ktime_t *calltime = (ktime_t *)data;
Linus Torvaldse0df1542008-05-15 18:14:01 -07001179
Sakari Ailusd75f7732019-03-25 21:32:28 +02001180 printk(KERN_DEBUG "calling %pS @ %i\n", fn, task_pid_nr(current));
Steven Rostedt (VMware)4e379582018-03-26 13:31:07 -04001181 *calltime = ktime_get();
1182}
1183
1184static __init_or_module void
1185trace_initcall_finish_cb(void *data, initcall_t fn, int ret)
1186{
1187 ktime_t *calltime = (ktime_t *)data;
1188 ktime_t delta, rettime;
1189 unsigned long long duration;
1190
Kevin Winchester22c5c032010-08-09 17:20:32 -07001191 rettime = ktime_get();
Steven Rostedt (VMware)4e379582018-03-26 13:31:07 -04001192 delta = ktime_sub(rettime, *calltime);
Kevin Winchester22c5c032010-08-09 17:20:32 -07001193 duration = (unsigned long long) ktime_to_ns(delta) >> 10;
Sakari Ailusd75f7732019-03-25 21:32:28 +02001194 printk(KERN_DEBUG "initcall %pS returned %d after %lld usecs\n",
Andrew Mortonea676e82013-04-29 16:18:20 -07001195 fn, ret, duration);
Kevin Winchester22c5c032010-08-09 17:20:32 -07001196}
1197
Steven Rostedt (VMware)4e379582018-03-26 13:31:07 -04001198static ktime_t initcall_calltime;
1199
Steven Rostedt (VMware)b0dc52f2018-04-06 09:24:25 -04001200#ifdef TRACEPOINTS_ENABLED
Steven Rostedt (VMware)4e379582018-03-26 13:31:07 -04001201static void __init initcall_debug_enable(void)
1202{
1203 int ret;
1204
1205 ret = register_trace_initcall_start(trace_initcall_start_cb,
1206 &initcall_calltime);
1207 ret |= register_trace_initcall_finish(trace_initcall_finish_cb,
1208 &initcall_calltime);
1209 WARN(ret, "Failed to register initcall tracepoints\n");
Kevin Winchester22c5c032010-08-09 17:20:32 -07001210}
Steven Rostedt (VMware)b0dc52f2018-04-06 09:24:25 -04001211# define do_trace_initcall_start trace_initcall_start
1212# define do_trace_initcall_finish trace_initcall_finish
1213#else
1214static inline void do_trace_initcall_start(initcall_t fn)
1215{
1216 if (!initcall_debug)
1217 return;
1218 trace_initcall_start_cb(&initcall_calltime, fn);
1219}
1220static inline void do_trace_initcall_finish(initcall_t fn, int ret)
1221{
1222 if (!initcall_debug)
1223 return;
1224 trace_initcall_finish_cb(&initcall_calltime, fn, ret);
1225}
1226#endif /* !TRACEPOINTS_ENABLED */
Kevin Winchester22c5c032010-08-09 17:20:32 -07001227
Kevin Winchestere4461272010-08-09 17:20:32 -07001228int __init_or_module do_one_initcall(initcall_t fn)
Kevin Winchester22c5c032010-08-09 17:20:32 -07001229{
1230 int count = preempt_count();
Steven Rostedtff1c8fa2013-07-03 15:05:37 -07001231 char msgbuf[64];
Steven Rostedt (VMware)4e379582018-03-26 13:31:07 -04001232 int ret;
Kevin Winchester22c5c032010-08-09 17:20:32 -07001233
Prarit Bhargava7b0b73d2014-06-04 16:12:17 -07001234 if (initcall_blacklisted(fn))
1235 return -EPERM;
1236
Steven Rostedt (VMware)b0dc52f2018-04-06 09:24:25 -04001237 do_trace_initcall_start(fn);
Steven Rostedt (VMware)4e379582018-03-26 13:31:07 -04001238 ret = fn();
Steven Rostedt (VMware)b0dc52f2018-04-06 09:24:25 -04001239 do_trace_initcall_finish(fn, ret);
Linus Torvaldse0df1542008-05-15 18:14:01 -07001240
1241 msgbuf[0] = 0;
1242
Linus Torvaldse0df1542008-05-15 18:14:01 -07001243 if (preempt_count() != count) {
Steven Rostedtbf5d7702013-05-01 13:35:51 -04001244 sprintf(msgbuf, "preemption imbalance ");
Peter Zijlstra4a2b4b22013-08-14 14:55:24 +02001245 preempt_count_set(count);
Linus Torvaldse0df1542008-05-15 18:14:01 -07001246 }
1247 if (irqs_disabled()) {
Cyrill Gorcunova76bfd02008-05-15 13:52:41 -07001248 strlcat(msgbuf, "disabled interrupts ", sizeof(msgbuf));
Linus Torvaldse0df1542008-05-15 18:14:01 -07001249 local_irq_enable();
1250 }
Sakari Ailusd75f7732019-03-25 21:32:28 +02001251 WARN(msgbuf[0], "initcall %pS returned with %s\n", fn, msgbuf);
Arjan van de Ven59f94152008-07-30 12:49:02 -07001252
Emese Revfy38addce2016-06-20 20:41:19 +02001253 add_latent_entropy();
Américo Wang30dbb20e2010-05-26 18:57:53 +08001254 return ret;
Linus Torvaldse0df1542008-05-15 18:14:01 -07001255}
1256
1257
Ard Biesheuvel1b1eeca2018-08-21 21:56:13 -07001258extern initcall_entry_t __initcall_start[];
1259extern initcall_entry_t __initcall0_start[];
1260extern initcall_entry_t __initcall1_start[];
1261extern initcall_entry_t __initcall2_start[];
1262extern initcall_entry_t __initcall3_start[];
1263extern initcall_entry_t __initcall4_start[];
1264extern initcall_entry_t __initcall5_start[];
1265extern initcall_entry_t __initcall6_start[];
1266extern initcall_entry_t __initcall7_start[];
1267extern initcall_entry_t __initcall_end[];
Pawel Moll026cee02012-03-26 12:50:51 +10301268
Ard Biesheuvel1b1eeca2018-08-21 21:56:13 -07001269static initcall_entry_t *initcall_levels[] __initdata = {
Pawel Moll026cee02012-03-26 12:50:51 +10301270 __initcall0_start,
1271 __initcall1_start,
1272 __initcall2_start,
1273 __initcall3_start,
1274 __initcall4_start,
1275 __initcall5_start,
1276 __initcall6_start,
1277 __initcall7_start,
1278 __initcall_end,
1279};
1280
Jim Cromie96263d22012-06-14 16:00:59 -06001281/* Keep these in sync with initcalls in include/linux/init.h */
Alexey Dobriyan7c8f7192019-01-03 15:27:29 -08001282static const char *initcall_level_names[] __initdata = {
Steven Rostedt (VMware)a6fb6012018-03-22 19:28:54 -04001283 "pure",
Jim Cromie9fb48c72012-04-27 14:30:34 -06001284 "core",
1285 "postcore",
1286 "arch",
1287 "subsys",
1288 "fs",
1289 "device",
1290 "late",
Pawel Moll026cee02012-03-26 12:50:51 +10301291};
1292
Arvind Sankar7e2762e2020-01-30 22:17:16 -08001293static int __init ignore_unknown_bootoption(char *param, char *val,
1294 const char *unused, void *arg)
1295{
1296 return 0;
1297}
1298
Masami Hiramatsu0068c922020-01-11 01:04:31 +09001299static void __init do_initcall_level(int level, char *command_line)
Pawel Moll026cee02012-03-26 12:50:51 +10301300{
Ard Biesheuvel1b1eeca2018-08-21 21:56:13 -07001301 initcall_entry_t *fn;
Pawel Moll026cee02012-03-26 12:50:51 +10301302
Pawel Moll026cee02012-03-26 12:50:51 +10301303 parse_args(initcall_level_names[level],
Masami Hiramatsu0068c922020-01-11 01:04:31 +09001304 command_line, __start___param,
Pawel Moll026cee02012-03-26 12:50:51 +10301305 __stop___param - __start___param,
1306 level, level,
Arvind Sankar7e2762e2020-01-30 22:17:16 -08001307 NULL, ignore_unknown_bootoption);
Pawel Moll026cee02012-03-26 12:50:51 +10301308
Steven Rostedt (VMware)4ee7c602018-03-23 10:18:03 -04001309 trace_initcall_level(initcall_level_names[level]);
Pawel Moll026cee02012-03-26 12:50:51 +10301310 for (fn = initcall_levels[level]; fn < initcall_levels[level+1]; fn++)
Ard Biesheuvel1b1eeca2018-08-21 21:56:13 -07001311 do_one_initcall(initcall_from_entry(fn));
Pawel Moll026cee02012-03-26 12:50:51 +10301312}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001313
1314static void __init do_initcalls(void)
1315{
Pawel Moll026cee02012-03-26 12:50:51 +10301316 int level;
Masami Hiramatsu0068c922020-01-11 01:04:31 +09001317 size_t len = strlen(saved_command_line) + 1;
1318 char *command_line;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001319
Masami Hiramatsu0068c922020-01-11 01:04:31 +09001320 command_line = kzalloc(len, GFP_KERNEL);
1321 if (!command_line)
1322 panic("%s: Failed to allocate %zu bytes\n", __func__, len);
1323
1324 for (level = 0; level < ARRAY_SIZE(initcall_levels) - 1; level++) {
1325 /* Parser modifies command_line, restore it each time */
1326 strcpy(command_line, saved_command_line);
1327 do_initcall_level(level, command_line);
1328 }
1329
1330 kfree(command_line);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001331}
1332
1333/*
1334 * Ok, the machine is now initialized. None of the devices
1335 * have been touched yet, but the CPU subsystem is up and
1336 * running, and memory and process management works.
1337 *
1338 * Now we can finally start doing some real work..
1339 */
1340static void __init do_basic_setup(void)
1341{
Lai Jiangshan759ee092009-03-25 17:06:30 +08001342 cpuset_init_smp();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001343 driver_init();
Eric W. Biedermanb04c3af2007-02-14 00:33:57 -08001344 init_irq_proc();
Peter Oberparleiterb99b87f2009-06-17 16:28:03 -07001345 do_ctors();
Linus Torvaldsd5767c52011-09-28 10:23:44 -07001346 usermodehelper_enable();
wangyanqingb0f84372011-09-29 15:09:40 +08001347 do_initcalls();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001348}
1349
Eduard - Gabriel Munteanu7babe8d2008-07-25 19:45:11 -07001350static void __init do_pre_smp_initcalls(void)
Eduard - Gabriel Munteanuc2147a52008-07-25 19:45:11 -07001351{
Ard Biesheuvel1b1eeca2018-08-21 21:56:13 -07001352 initcall_entry_t *fn;
Eduard - Gabriel Munteanuc2147a52008-07-25 19:45:11 -07001353
Steven Rostedt (VMware)4ee7c602018-03-23 10:18:03 -04001354 trace_initcall_level("early");
Pawel Moll026cee02012-03-26 12:50:51 +10301355 for (fn = __initcall_start; fn < __initcall0_start; fn++)
Ard Biesheuvel1b1eeca2018-08-21 21:56:13 -07001356 do_one_initcall(initcall_from_entry(fn));
Eduard - Gabriel Munteanuc2147a52008-07-25 19:45:11 -07001357}
1358
Al Viroa74fb732012-10-10 21:28:25 -04001359static int run_init_process(const char *init_filename)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001360{
Arvind Sankarb88c50a2020-01-30 22:17:13 -08001361 const char *const *p;
1362
Linus Torvalds1da177e2005-04-16 15:20:36 -07001363 argv_init[0] = init_filename;
Paul Menzel3f5c15d2018-08-21 21:58:37 -07001364 pr_info("Run %s as init process\n", init_filename);
Arvind Sankarb88c50a2020-01-30 22:17:13 -08001365 pr_debug(" with arguments:\n");
1366 for (p = argv_init; *p; p++)
1367 pr_debug(" %s\n", *p);
1368 pr_debug(" with environment:\n");
1369 for (p = envp_init; *p; p++)
1370 pr_debug(" %s\n", *p);
Eric W. Biedermanbe619f72020-07-13 12:06:48 -05001371 return kernel_execve(init_filename, argv_init, envp_init);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001372}
1373
Michael Opdenackerba247622013-11-12 15:10:21 -08001374static int try_to_run_init_process(const char *init_filename)
1375{
1376 int ret;
1377
1378 ret = run_init_process(init_filename);
1379
1380 if (ret && ret != -ENOENT) {
1381 pr_err("Starting init: %s exists but couldn't execute it (error %d)\n",
1382 init_filename, ret);
1383 }
1384
1385 return ret;
1386}
1387
Vineet Guptaf80b0c92012-12-21 12:25:44 +05301388static noinline void __init kernel_init_freeable(void);
Al Virod6b21232012-10-10 19:57:26 -04001389
Laura Abbott0f5bf6d2017-02-06 16:31:58 -08001390#if defined(CONFIG_STRICT_KERNEL_RWX) || defined(CONFIG_STRICT_MODULE_RWX)
AKASHI Takahiro39290b32016-11-14 15:15:05 +09001391bool rodata_enabled __ro_after_init = true;
Kees Cookd2aa1ac2016-02-17 14:41:13 -08001392static int __init set_debug_rodata(char *str)
1393{
1394 return strtobool(str, &rodata_enabled);
1395}
1396__setup("rodata=", set_debug_rodata);
AKASHI Takahiro39290b32016-11-14 15:15:05 +09001397#endif
Kees Cookd2aa1ac2016-02-17 14:41:13 -08001398
Laura Abbott0f5bf6d2017-02-06 16:31:58 -08001399#ifdef CONFIG_STRICT_KERNEL_RWX
Kees Cookd2aa1ac2016-02-17 14:41:13 -08001400static void mark_readonly(void)
1401{
Jinbum Park2959a5f2017-02-27 14:30:22 -08001402 if (rodata_enabled) {
Jeffrey Hugoae646f02018-05-11 16:01:42 -07001403 /*
Paul E. McKenneyba180312018-11-06 18:58:01 -08001404 * load_module() results in W+X mappings, which are cleaned
1405 * up with call_rcu(). Let's make sure that queued work is
Jeffrey Hugoae646f02018-05-11 16:01:42 -07001406 * flushed so that we don't hit false positives looking for
1407 * insecure pages which are W+X.
1408 */
Paul E. McKenneyba180312018-11-06 18:58:01 -08001409 rcu_barrier();
Kees Cookd2aa1ac2016-02-17 14:41:13 -08001410 mark_rodata_ro();
Jinbum Park2959a5f2017-02-27 14:30:22 -08001411 rodata_test();
1412 } else
Kees Cookd2aa1ac2016-02-17 14:41:13 -08001413 pr_info("Kernel memory protection disabled.\n");
1414}
Christophe Leroyf596ded12020-01-30 22:17:23 -08001415#elif defined(CONFIG_ARCH_HAS_STRICT_KERNEL_RWX)
1416static inline void mark_readonly(void)
1417{
1418 pr_warn("Kernel memory protection not selected by kernel config.\n");
1419}
Kees Cookd2aa1ac2016-02-17 14:41:13 -08001420#else
1421static inline void mark_readonly(void)
1422{
1423 pr_warn("This architecture does not have kernel memory protection.\n");
1424}
1425#endif
1426
Mike Rapoport997aef62019-05-13 17:18:40 -07001427void __weak free_initmem(void)
1428{
Mike Rapoportf4039992019-05-13 17:18:46 -07001429 free_initmem_default(POISON_FREE_INITMEM);
Mike Rapoport997aef62019-05-13 17:18:40 -07001430}
1431
Al Virod6b21232012-10-10 19:57:26 -04001432static int __ref kernel_init(void *unused)
Vivek Goyalee5bfa62007-02-13 13:26:22 +01001433{
Michael Opdenackerba247622013-11-12 15:10:21 -08001434 int ret;
1435
Al Virod6b21232012-10-10 19:57:26 -04001436 kernel_init_freeable();
Arjan van de Ven22a9d642009-01-07 08:45:46 -08001437 /* need to finish all async __init code before freeing the memory */
1438 async_synchronize_full();
Masami Hiramatsu82d083a2020-09-10 17:55:05 +09001439 kprobe_free_init_mem();
Steven Rostedt (VMware)b80f0f62017-04-03 12:57:35 -04001440 ftrace_free_init_mem();
Vivek Goyalee5bfa62007-02-13 13:26:22 +01001441 free_initmem();
Kees Cookd2aa1ac2016-02-17 14:41:13 -08001442 mark_readonly();
Joerg Roedelb9766902018-07-18 11:41:06 +02001443
1444 /*
1445 * Kernel mappings are now finalized - update the userspace page-table
1446 * to finalize PTI.
1447 */
1448 pti_finalize();
1449
Vivek Goyalee5bfa62007-02-13 13:26:22 +01001450 system_state = SYSTEM_RUNNING;
1451 numa_default_policy();
1452
Paul E. McKenney967dcb82015-11-25 16:52:36 -08001453 rcu_end_inkernel_boot();
1454
Vlastimil Babka3db978d2020-06-07 21:40:24 -07001455 do_sysctl_args();
1456
Vivek Goyalee5bfa62007-02-13 13:26:22 +01001457 if (ramdisk_execute_command) {
Michael Opdenackerba247622013-11-12 15:10:21 -08001458 ret = run_init_process(ramdisk_execute_command);
1459 if (!ret)
Al Viroa74fb732012-10-10 21:28:25 -04001460 return 0;
Michael Opdenackerba247622013-11-12 15:10:21 -08001461 pr_err("Failed to execute %s (error %d)\n",
1462 ramdisk_execute_command, ret);
Vivek Goyalee5bfa62007-02-13 13:26:22 +01001463 }
1464
1465 /*
1466 * We try each of these until one succeeds.
1467 *
1468 * The Bourne shell can be used instead of init if we are
1469 * trying to recover a really broken machine.
1470 */
1471 if (execute_command) {
Michael Opdenackerba247622013-11-12 15:10:21 -08001472 ret = run_init_process(execute_command);
1473 if (!ret)
Al Viroa74fb732012-10-10 21:28:25 -04001474 return 0;
Andy Lutomirski6ef45362014-12-10 15:52:19 -08001475 panic("Requested init %s failed (error %d).",
1476 execute_command, ret);
Vivek Goyalee5bfa62007-02-13 13:26:22 +01001477 }
Chris Downada4ab72020-06-04 16:50:53 -07001478
1479 if (CONFIG_DEFAULT_INIT[0] != '\0') {
1480 ret = run_init_process(CONFIG_DEFAULT_INIT);
1481 if (ret)
1482 pr_err("Default init %s failed (error %d)\n",
1483 CONFIG_DEFAULT_INIT, ret);
1484 else
1485 return 0;
1486 }
1487
Michael Opdenackerba247622013-11-12 15:10:21 -08001488 if (!try_to_run_init_process("/sbin/init") ||
1489 !try_to_run_init_process("/etc/init") ||
1490 !try_to_run_init_process("/bin/init") ||
1491 !try_to_run_init_process("/bin/sh"))
Al Viroa74fb732012-10-10 21:28:25 -04001492 return 0;
Vivek Goyalee5bfa62007-02-13 13:26:22 +01001493
Michael Opdenackerba247622013-11-12 15:10:21 -08001494 panic("No working init found. Try passing init= option to kernel. "
Mauro Carvalho Chehab8c27ceff32016-10-18 10:12:27 -02001495 "See Linux Documentation/admin-guide/init.rst for guidance.");
Vivek Goyalee5bfa62007-02-13 13:26:22 +01001496}
1497
Christoph Hellwig8f740632020-06-07 17:44:28 +02001498/* Open /dev/console, for stdin/stdout/stderr, this should never fail */
Christoph Hellwiga94b5212020-07-28 18:23:21 +02001499void __init console_on_rootfs(void)
Dominik Brodowskib49a7332018-10-23 16:00:10 +02001500{
Christoph Hellwig8f740632020-06-07 17:44:28 +02001501 struct file *file = filp_open("/dev/console", O_RDWR, 0);
Dominik Brodowskib49a7332018-10-23 16:00:10 +02001502
Christoph Hellwig8f740632020-06-07 17:44:28 +02001503 if (IS_ERR(file)) {
1504 pr_err("Warning: unable to open an initial console.\n");
1505 return;
1506 }
Christoph Hellwigf0735312020-07-28 17:49:47 +02001507 init_dup(file);
1508 init_dup(file);
1509 init_dup(file);
1510 fput(file);
Dominik Brodowskib49a7332018-10-23 16:00:10 +02001511}
1512
Vineet Guptaf80b0c92012-12-21 12:25:44 +05301513static noinline void __init kernel_init_freeable(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001514{
Peter Zijlstrab433c3d2010-06-28 16:51:01 +02001515 /*
1516 * Wait until kthreadd is all set-up.
1517 */
1518 wait_for_completion(&kthreadd_done);
Linus Torvalds31a67102012-05-21 12:52:42 -07001519
1520 /* Now the scheduler is fully set up and can do blocking allocations */
1521 gfp_allowed_mask = __GFP_BITS_MASK;
1522
Miao Xie58568d22009-06-16 15:31:49 -07001523 /*
1524 * init can allocate pages on any node
1525 */
Lai Jiangshan3c466d42012-12-12 13:51:40 -08001526 set_mems_allowed(node_states[N_MEMORY]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001527
Cedric Le Goater9ec52092006-10-02 02:19:00 -07001528 cad_pid = task_pid(current);
1529
Andi Kleenca74a6f2008-01-30 13:33:17 +01001530 smp_prepare_cpus(setup_max_cpus);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001531
Tejun Heo3347fa02016-09-16 15:49:32 -04001532 workqueue_init();
1533
Michal Hocko597b7302017-03-31 15:11:47 -07001534 init_mm_internals();
1535
Uladzislau Rezki (Sony)30b491e2020-12-09 21:27:31 +01001536 rcu_init_tasks_generic();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001537 do_pre_smp_initcalls();
Peter Zijlstra004417a2010-11-25 18:38:29 +01001538 lockup_detector_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001539
Linus Torvalds1da177e2005-04-16 15:20:36 -07001540 smp_init();
1541 sched_init_smp();
1542
Daniel Jordanf1b192b2020-06-03 15:59:35 -07001543 padata_init();
Mel Gorman0e1cc952015-06-30 14:57:27 -07001544 page_alloc_init_late();
Qian Cai2f1ee092019-02-12 15:36:03 -08001545 /* Initialize page ext after all struct pages are initialized. */
1546 page_ext_init();
Mel Gorman0e1cc952015-06-30 14:57:27 -07001547
Linus Torvalds1da177e2005-04-16 15:20:36 -07001548 do_basic_setup();
1549
Brendan Higgins8c0d8842020-08-04 13:47:43 -07001550 kunit_run_all_tests();
1551
Dominik Brodowskib49a7332018-10-23 16:00:10 +02001552 console_on_rootfs();
Eric W. Biederman2bd3a9972010-03-02 23:53:19 -08001553
Linus Torvalds1da177e2005-04-16 15:20:36 -07001554 /*
1555 * check if there is an early userspace init. If yes, let it do all
1556 * the work
1557 */
Christoph Hellwigeb9d7d32020-07-22 11:14:02 +02001558 if (init_eaccess(ramdisk_execute_command) != 0) {
Olof Johanssonffdfc402005-09-06 15:17:19 -07001559 ramdisk_execute_command = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001560 prepare_namespace();
Olof Johanssonffdfc402005-09-06 15:17:19 -07001561 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001562
1563 /*
1564 * Ok, we have completed the initial bootup, and
1565 * we're essentially up and running. Get rid of the
1566 * initmem segments and start the user-mode stuff..
Dmitry Kasatkinc9cd2ce2014-11-05 17:01:15 +02001567 *
1568 * rootfs is available now, try loading the public keys
1569 * and default modules
Linus Torvalds1da177e2005-04-16 15:20:36 -07001570 */
Tejun Heobb813f42013-01-18 14:05:56 -08001571
Dmitry Kasatkinc9cd2ce2014-11-05 17:01:15 +02001572 integrity_load_keys();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001573}