Commit | Line | Data |
---|---|---|
457c8996 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
1da177e4 LT |
2 | /* |
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 | |
dd4d9fec | 10 | * Simplified starting of init: Michael A. Griffith <grif@acm.org> |
1da177e4 LT |
11 | */ |
12 | ||
ea676e84 AM |
13 | #define DEBUG /* Enable initcall_debug */ |
14 | ||
1da177e4 | 15 | #include <linux/types.h> |
8a293be0 | 16 | #include <linux/extable.h> |
1da177e4 LT |
17 | #include <linux/module.h> |
18 | #include <linux/proc_fs.h> | |
5c2c5c55 | 19 | #include <linux/binfmts.h> |
1da177e4 LT |
20 | #include <linux/kernel.h> |
21 | #include <linux/syscalls.h> | |
9b5609fd | 22 | #include <linux/stackprotector.h> |
1da177e4 LT |
23 | #include <linux/string.h> |
24 | #include <linux/ctype.h> | |
25 | #include <linux/delay.h> | |
1da177e4 LT |
26 | #include <linux/ioport.h> |
27 | #include <linux/init.h> | |
1da177e4 | 28 | #include <linux/initrd.h> |
57c8a661 | 29 | #include <linux/memblock.h> |
4a7a16dc | 30 | #include <linux/acpi.h> |
7684b858 | 31 | #include <linux/bootconfig.h> |
0c688614 | 32 | #include <linux/console.h> |
38b8d208 | 33 | #include <linux/nmi.h> |
1da177e4 LT |
34 | #include <linux/percpu.h> |
35 | #include <linux/kmod.h> | |
82d083ab | 36 | #include <linux/kprobes.h> |
3c206509 | 37 | #include <linux/kmsan.h> |
db64fe02 | 38 | #include <linux/vmalloc.h> |
1da177e4 | 39 | #include <linux/kernel_stat.h> |
d7cd5611 | 40 | #include <linux/start_kernel.h> |
1da177e4 | 41 | #include <linux/security.h> |
3d442233 | 42 | #include <linux/smp.h> |
1da177e4 | 43 | #include <linux/profile.h> |
0ce20dd8 | 44 | #include <linux/kfence.h> |
1da177e4 | 45 | #include <linux/rcupdate.h> |
8e9c01c7 | 46 | #include <linux/srcu.h> |
1da177e4 LT |
47 | #include <linux/moduleparam.h> |
48 | #include <linux/kallsyms.h> | |
83cc6fa0 | 49 | #include <linux/buildid.h> |
1da177e4 LT |
50 | #include <linux/writeback.h> |
51 | #include <linux/cpu.h> | |
52 | #include <linux/cpuset.h> | |
ddbcc7e8 | 53 | #include <linux/cgroup.h> |
1da177e4 | 54 | #include <linux/efi.h> |
906568c9 | 55 | #include <linux/tick.h> |
78634061 | 56 | #include <linux/sched/isolation.h> |
6168a702 | 57 | #include <linux/interrupt.h> |
c757249a | 58 | #include <linux/taskstats_kern.h> |
ca74e92b | 59 | #include <linux/delayacct.h> |
1da177e4 | 60 | #include <linux/unistd.h> |
3ea056c5 | 61 | #include <linux/utsname.h> |
1da177e4 LT |
62 | #include <linux/rmap.h> |
63 | #include <linux/mempolicy.h> | |
64 | #include <linux/key.h> | |
eefa864b | 65 | #include <linux/page_ext.h> |
9a11b49a | 66 | #include <linux/debug_locks.h> |
3ac7fe5a | 67 | #include <linux/debugobjects.h> |
fbb9ce95 | 68 | #include <linux/lockdep.h> |
3c7b4e6b | 69 | #include <linux/kmemleak.h> |
f1b192b1 | 70 | #include <linux/padata.h> |
84d73786 | 71 | #include <linux/pid_namespace.h> |
4c002c97 | 72 | #include <linux/device/driver.h> |
73c27992 | 73 | #include <linux/kthread.h> |
e6fe6649 | 74 | #include <linux/sched.h> |
1777e463 | 75 | #include <linux/sched/init.h> |
a1c9eea9 | 76 | #include <linux/signal.h> |
199f0ca5 | 77 | #include <linux/idr.h> |
0b4b3827 | 78 | #include <linux/kgdb.h> |
68bf21aa | 79 | #include <linux/ftrace.h> |
22a9d645 | 80 | #include <linux/async.h> |
2b2af54a | 81 | #include <linux/shmem_fs.h> |
5a0e3ad6 | 82 | #include <linux/slab.h> |
24a24bb6 | 83 | #include <linux/perf_event.h> |
a74fb73c | 84 | #include <linux/ptrace.h> |
aa8c6248 | 85 | #include <linux/pti.h> |
bb813f4c | 86 | #include <linux/blkdev.h> |
5d2a4e91 | 87 | #include <linux/sched/clock.h> |
29930025 | 88 | #include <linux/sched/task.h> |
68db0cf1 | 89 | #include <linux/sched/task_stack.h> |
65f382fd | 90 | #include <linux/context_tracking.h> |
47d06e53 | 91 | #include <linux/random.h> |
7b0b73d7 | 92 | #include <linux/list.h> |
c9cd2ce2 | 93 | #include <linux/integrity.h> |
e149ed2b | 94 | #include <linux/proc_ns.h> |
0ddab1d2 | 95 | #include <linux/io.h> |
39290b38 | 96 | #include <linux/cache.h> |
2959a5f7 | 97 | #include <linux/rodata_test.h> |
33352244 | 98 | #include <linux/jump_label.h> |
ae67d58d | 99 | #include <linux/mem_encrypt.h> |
dfd402a4 | 100 | #include <linux/kcsan.h> |
eb9d7d39 | 101 | #include <linux/init_syscalls.h> |
e1fdc403 | 102 | #include <linux/stackdepot.h> |
375561bd | 103 | #include <linux/randomize_kstack.h> |
9c1be193 | 104 | #include <net/net_namespace.h> |
1da177e4 LT |
105 | |
106 | #include <asm/io.h> | |
107 | #include <asm/bugs.h> | |
108 | #include <asm/setup.h> | |
a940199f | 109 | #include <asm/sections.h> |
37b73c82 | 110 | #include <asm/cacheflush.h> |
1da177e4 | 111 | |
4ee7c60d SRV |
112 | #define CREATE_TRACE_POINTS |
113 | #include <trace/events/initcall.h> | |
114 | ||
8c0d8849 BH |
115 | #include <kunit/test.h> |
116 | ||
aae5f662 | 117 | static int kernel_init(void *); |
1da177e4 LT |
118 | |
119 | extern void init_IRQ(void); | |
1da177e4 | 120 | extern void radix_tree_init(void); |
54a611b6 | 121 | extern void maple_tree_init(void); |
1da177e4 | 122 | |
2ce802f6 TH |
123 | /* |
124 | * Debug helper: via this flag we know that we are in 'early bootup code' | |
125 | * where only the boot processor is running with IRQ disabled. This means | |
126 | * two things - IRQ must not be enabled before the flag is cleared and some | |
127 | * operations which are not allowed with IRQ disabled are allowed while the | |
128 | * flag is set. | |
129 | */ | |
130 | bool early_boot_irqs_disabled __read_mostly; | |
131 | ||
a6826048 | 132 | enum system_states system_state __read_mostly; |
1da177e4 LT |
133 | EXPORT_SYMBOL(system_state); |
134 | ||
135 | /* | |
136 | * Boot command-line arguments | |
137 | */ | |
138 | #define MAX_INIT_ARGS CONFIG_INIT_ENV_ARG_LIMIT | |
139 | #define MAX_INIT_ENVS CONFIG_INIT_ENV_ARG_LIMIT | |
140 | ||
141 | extern void time_init(void); | |
142 | /* Default late time init is NULL. archs can override this later. */ | |
d2e3192b | 143 | void (*__initdata late_time_init)(void); |
1da177e4 | 144 | |
30d7e0d4 ABL |
145 | /* Untouched command line saved by arch-specific code. */ |
146 | char __initdata boot_command_line[COMMAND_LINE_SIZE]; | |
147 | /* Untouched saved command line (eg. for /proc) */ | |
148 | char *saved_command_line; | |
149 | /* Command line for parameter parsing */ | |
150 | static char *static_command_line; | |
51887d03 MH |
151 | /* Untouched extra command line */ |
152 | static char *extra_command_line; | |
13199162 MH |
153 | /* Extra init arguments */ |
154 | static char *extra_init_args; | |
1da177e4 | 155 | |
f61872bb SRV |
156 | #ifdef CONFIG_BOOT_CONFIG |
157 | /* Is bootconfig on command line? */ | |
158 | static bool bootconfig_found; | |
b66fbbe8 | 159 | static size_t initargs_offs; |
f61872bb SRV |
160 | #else |
161 | # define bootconfig_found false | |
b66fbbe8 | 162 | # define initargs_offs 0 |
f61872bb SRV |
163 | #endif |
164 | ||
1da177e4 | 165 | static char *execute_command; |
916db733 | 166 | static char *ramdisk_execute_command = "/init"; |
1da177e4 | 167 | |
c4b2c0c5 HFS |
168 | /* |
169 | * Used to generate warnings if static_key manipulation functions are used | |
170 | * before jump_label_init is called. | |
171 | */ | |
dd4d9fec | 172 | bool static_key_initialized __read_mostly; |
c4b2c0c5 HFS |
173 | EXPORT_SYMBOL_GPL(static_key_initialized); |
174 | ||
8b3b2955 JB |
175 | /* |
176 | * If set, this is an indication to the drivers that reset the underlying | |
177 | * device before going ahead with the initialization otherwise driver might | |
178 | * rely on the BIOS and skip the reset operation. | |
179 | * | |
180 | * This is useful if kernel is booting in an unreliable environment. | |
fc454fdc | 181 | * For ex. kdump situation where previous kernel has crashed, BIOS has been |
8b3b2955 JB |
182 | * skipped and devices will be in unknown state. |
183 | */ | |
184 | unsigned int reset_devices; | |
185 | EXPORT_SYMBOL(reset_devices); | |
1da177e4 | 186 | |
7e96287d VG |
187 | static int __init set_reset_devices(char *str) |
188 | { | |
189 | reset_devices = 1; | |
190 | return 1; | |
191 | } | |
192 | ||
193 | __setup("reset_devices", set_reset_devices); | |
194 | ||
dd4d9fec FF |
195 | static const char *argv_init[MAX_INIT_ARGS+2] = { "init", NULL, }; |
196 | const char *envp_init[MAX_INIT_ENVS+2] = { "HOME=/", "TERM=linux", NULL, }; | |
1da177e4 LT |
197 | static const char *panic_later, *panic_param; |
198 | ||
914dcaa8 | 199 | extern const struct obs_kernel_param __setup_start[], __setup_end[]; |
1da177e4 | 200 | |
31c025b5 | 201 | static bool __init obsolete_checksetup(char *line) |
1da177e4 | 202 | { |
914dcaa8 | 203 | const struct obs_kernel_param *p; |
31c025b5 | 204 | bool had_early_param = false; |
1da177e4 LT |
205 | |
206 | p = __setup_start; | |
207 | do { | |
208 | int n = strlen(p->str); | |
b1e4d20c | 209 | if (parameqn(line, p->str, n)) { |
1da177e4 | 210 | if (p->early) { |
33df0d19 RR |
211 | /* Already done in parse_early_param? |
212 | * (Needs exact match on param part). | |
213 | * Keep iterating, as we can have early | |
214 | * params and __setups of same names 8( */ | |
1da177e4 | 215 | if (line[n] == '\0' || line[n] == '=') |
31c025b5 | 216 | had_early_param = true; |
1da177e4 | 217 | } else if (!p->setup_func) { |
ea676e84 AM |
218 | pr_warn("Parameter %s is obsolete, ignored\n", |
219 | p->str); | |
31c025b5 | 220 | return true; |
1da177e4 | 221 | } else if (p->setup_func(line + n)) |
31c025b5 | 222 | return true; |
1da177e4 LT |
223 | } |
224 | p++; | |
225 | } while (p < __setup_end); | |
33df0d19 RR |
226 | |
227 | return had_early_param; | |
1da177e4 LT |
228 | } |
229 | ||
230 | /* | |
231 | * This should be approx 2 Bo*oMips to start (note initial shift), and will | |
232 | * still work even if initially too large, it will just take slightly longer | |
233 | */ | |
234 | unsigned long loops_per_jiffy = (1<<12); | |
1da177e4 LT |
235 | EXPORT_SYMBOL(loops_per_jiffy); |
236 | ||
237 | static int __init debug_kernel(char *str) | |
238 | { | |
a8fe19eb | 239 | console_loglevel = CONSOLE_LOGLEVEL_DEBUG; |
f6f21c81 | 240 | return 0; |
1da177e4 LT |
241 | } |
242 | ||
243 | static int __init quiet_kernel(char *str) | |
244 | { | |
a8fe19eb | 245 | console_loglevel = CONSOLE_LOGLEVEL_QUIET; |
f6f21c81 | 246 | return 0; |
1da177e4 LT |
247 | } |
248 | ||
f6f21c81 YL |
249 | early_param("debug", debug_kernel); |
250 | early_param("quiet", quiet_kernel); | |
1da177e4 LT |
251 | |
252 | static int __init loglevel(char *str) | |
253 | { | |
808bf29b AS |
254 | int newlevel; |
255 | ||
256 | /* | |
257 | * Only update loglevel value when a correct setting was passed, | |
258 | * to prevent blind crashes (when loglevel being set to 0) that | |
259 | * are quite hard to debug | |
260 | */ | |
261 | if (get_option(&str, &newlevel)) { | |
262 | console_loglevel = newlevel; | |
263 | return 0; | |
264 | } | |
265 | ||
266 | return -EINVAL; | |
1da177e4 LT |
267 | } |
268 | ||
f6f21c81 | 269 | early_param("loglevel", loglevel); |
1da177e4 | 270 | |
de462e5f | 271 | #ifdef CONFIG_BLK_DEV_INITRD |
a2a9d67a | 272 | static void * __init get_boot_config_from_initrd(size_t *_size) |
de462e5f MH |
273 | { |
274 | u32 size, csum; | |
275 | char *data; | |
276 | u32 *hdr; | |
50b8a742 | 277 | int i; |
de462e5f MH |
278 | |
279 | if (!initrd_end) | |
280 | return NULL; | |
281 | ||
282 | data = (char *)initrd_end - BOOTCONFIG_MAGIC_LEN; | |
50b8a742 MH |
283 | /* |
284 | * Since Grub may align the size of initrd to 4, we must | |
285 | * check the preceding 3 bytes as well. | |
286 | */ | |
287 | for (i = 0; i < 4; i++) { | |
288 | if (!memcmp(data, BOOTCONFIG_MAGIC, BOOTCONFIG_MAGIC_LEN)) | |
289 | goto found; | |
290 | data--; | |
291 | } | |
292 | return NULL; | |
de462e5f | 293 | |
50b8a742 | 294 | found: |
de462e5f | 295 | hdr = (u32 *)(data - 8); |
24aed094 MH |
296 | size = le32_to_cpu(hdr[0]); |
297 | csum = le32_to_cpu(hdr[1]); | |
de462e5f MH |
298 | |
299 | data = ((void *)hdr) - size; | |
300 | if ((unsigned long)data < initrd_start) { | |
301 | pr_err("bootconfig size %d is greater than initrd size %ld\n", | |
302 | size, initrd_end - initrd_start); | |
303 | return NULL; | |
304 | } | |
305 | ||
765b8552 MH |
306 | if (xbc_calc_checksum(data, size) != csum) { |
307 | pr_err("bootconfig checksum failed\n"); | |
308 | return NULL; | |
309 | } | |
310 | ||
de462e5f MH |
311 | /* Remove bootconfig from initramfs/initrd */ |
312 | initrd_end = (unsigned long)data; | |
313 | if (_size) | |
314 | *_size = size; | |
de462e5f MH |
315 | |
316 | return data; | |
317 | } | |
318 | #else | |
a2a9d67a | 319 | static void * __init get_boot_config_from_initrd(size_t *_size) |
de462e5f MH |
320 | { |
321 | return NULL; | |
322 | } | |
323 | #endif | |
324 | ||
7684b858 | 325 | #ifdef CONFIG_BOOT_CONFIG |
51887d03 | 326 | |
a27026e9 | 327 | static char xbc_namebuf[XBC_KEYLEN_MAX] __initdata; |
51887d03 MH |
328 | |
329 | #define rest(dst, end) ((end) > (dst) ? (end) - (dst) : 0) | |
330 | ||
331 | static int __init xbc_snprint_cmdline(char *buf, size_t size, | |
332 | struct xbc_node *root) | |
333 | { | |
334 | struct xbc_node *knode, *vnode; | |
335 | char *end = buf + size; | |
51887d03 MH |
336 | const char *val; |
337 | int ret; | |
338 | ||
339 | xbc_node_for_each_key_value(root, knode, val) { | |
340 | ret = xbc_node_compose_key_after(root, knode, | |
341 | xbc_namebuf, XBC_KEYLEN_MAX); | |
342 | if (ret < 0) | |
343 | return ret; | |
344 | ||
345 | vnode = xbc_node_get_child(knode); | |
88b91371 MH |
346 | if (!vnode) { |
347 | ret = snprintf(buf, rest(buf, end), "%s ", xbc_namebuf); | |
348 | if (ret < 0) | |
349 | return ret; | |
350 | buf += ret; | |
51887d03 | 351 | continue; |
88b91371 | 352 | } |
51887d03 | 353 | xbc_array_for_each_value(vnode, val) { |
88b91371 MH |
354 | ret = snprintf(buf, rest(buf, end), "%s=\"%s\" ", |
355 | xbc_namebuf, val); | |
51887d03 MH |
356 | if (ret < 0) |
357 | return ret; | |
358 | buf += ret; | |
51887d03 | 359 | } |
51887d03 MH |
360 | } |
361 | ||
362 | return buf - (end - size); | |
363 | } | |
364 | #undef rest | |
365 | ||
366 | /* Make an extra command line under given key word */ | |
367 | static char * __init xbc_make_cmdline(const char *key) | |
368 | { | |
369 | struct xbc_node *root; | |
370 | char *new_cmdline; | |
371 | int ret, len = 0; | |
372 | ||
373 | root = xbc_find_node(key); | |
374 | if (!root) | |
375 | return NULL; | |
376 | ||
377 | /* Count required buffer size */ | |
378 | len = xbc_snprint_cmdline(NULL, 0, root); | |
379 | if (len <= 0) | |
380 | return NULL; | |
381 | ||
382 | new_cmdline = memblock_alloc(len + 1, SMP_CACHE_BYTES); | |
383 | if (!new_cmdline) { | |
384 | pr_err("Failed to allocate memory for extra kernel cmdline.\n"); | |
385 | return NULL; | |
386 | } | |
387 | ||
388 | ret = xbc_snprint_cmdline(new_cmdline, len + 1, root); | |
389 | if (ret < 0 || ret > len) { | |
390 | pr_err("Failed to print extra kernel cmdline.\n"); | |
4421cca0 | 391 | memblock_free(new_cmdline, len + 1); |
51887d03 MH |
392 | return NULL; |
393 | } | |
394 | ||
395 | return new_cmdline; | |
396 | } | |
397 | ||
f61872bb SRV |
398 | static 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; | |
f61872bb SRV |
403 | } |
404 | return 0; | |
405 | } | |
406 | ||
d0ac5fba MH |
407 | static int __init warn_bootconfig(char *str) |
408 | { | |
409 | /* The 'bootconfig' has been handled by bootconfig_params(). */ | |
410 | return 0; | |
411 | } | |
412 | ||
2b7d2fe7 | 413 | static void __init setup_boot_config(void) |
7684b858 | 414 | { |
f61872bb | 415 | static char tmp_cmdline[COMMAND_LINE_SIZE] __initdata; |
a2a9d67a MH |
416 | const char *msg, *data; |
417 | int pos, ret; | |
418 | size_t size; | |
419 | char *err; | |
7684b858 | 420 | |
611d0a95 | 421 | /* Cut out the bootconfig data even if we have no bootconfig option */ |
765b8552 | 422 | data = get_boot_config_from_initrd(&size); |
a2a9d67a MH |
423 | /* If there is no bootconfig in initrd, try embedded one. */ |
424 | if (!data) | |
425 | data = xbc_get_embedded_bootconfig(&size); | |
de462e5f | 426 | |
a1d3a6d9 | 427 | strscpy(tmp_cmdline, boot_command_line, COMMAND_LINE_SIZE); |
477d0847 MH |
428 | err = parse_args("bootconfig", tmp_cmdline, NULL, 0, 0, 0, NULL, |
429 | bootconfig_params); | |
f61872bb | 430 | |
477d0847 | 431 | if (IS_ERR(err) || !bootconfig_found) |
7684b858 MH |
432 | return; |
433 | ||
b66fbbe8 | 434 | /* parse_args() stops at the next param of '--' and returns an address */ |
477d0847 | 435 | if (err) |
b66fbbe8 | 436 | initargs_offs = err - tmp_cmdline; |
477d0847 | 437 | |
611d0a95 MH |
438 | if (!data) { |
439 | pr_err("'bootconfig' found on command line, but no bootconfig found\n"); | |
440 | return; | |
441 | } | |
442 | ||
7495e092 | 443 | if (size >= XBC_DATA_MAX) { |
a2a9d67a MH |
444 | pr_err("bootconfig size %ld greater than max size %d\n", |
445 | (long)size, XBC_DATA_MAX); | |
7684b858 | 446 | return; |
7495e092 | 447 | } |
7684b858 | 448 | |
bdac5c2b | 449 | ret = xbc_init(data, size, &msg, &pos); |
89b74cac MH |
450 | if (ret < 0) { |
451 | if (pos < 0) | |
452 | pr_err("Failed to init bootconfig: %s.\n", msg); | |
453 | else | |
454 | pr_err("Failed to parse bootconfig: %s at %d.\n", | |
455 | msg, pos); | |
456 | } else { | |
e306220c | 457 | xbc_get_info(&ret, NULL); |
a2a9d67a | 458 | pr_info("Load bootconfig: %ld bytes %d nodes\n", (long)size, ret); |
51887d03 MH |
459 | /* keys starting with "kernel." are passed via cmdline */ |
460 | extra_command_line = xbc_make_cmdline("kernel"); | |
13199162 MH |
461 | /* Also, "init." keys are init arguments */ |
462 | extra_init_args = xbc_make_cmdline("init"); | |
51887d03 | 463 | } |
7495e092 | 464 | return; |
7684b858 | 465 | } |
de462e5f | 466 | |
40caa127 MH |
467 | static void __init exit_boot_config(void) |
468 | { | |
115d4d08 | 469 | xbc_exit(); |
40caa127 MH |
470 | } |
471 | ||
472 | #else /* !CONFIG_BOOT_CONFIG */ | |
de462e5f | 473 | |
2b7d2fe7 | 474 | static void __init setup_boot_config(void) |
de462e5f MH |
475 | { |
476 | /* Remove bootconfig data from initrd */ | |
765b8552 | 477 | get_boot_config_from_initrd(NULL); |
de462e5f | 478 | } |
d8a953dd MH |
479 | |
480 | static int __init warn_bootconfig(char *str) | |
481 | { | |
36c6aa26 | 482 | pr_warn("WARNING: 'bootconfig' found on the kernel command line but CONFIG_BOOT_CONFIG is not set.\n"); |
d8a953dd MH |
483 | return 0; |
484 | } | |
40caa127 MH |
485 | |
486 | #define exit_boot_config() do {} while (0) | |
487 | ||
488 | #endif /* CONFIG_BOOT_CONFIG */ | |
489 | ||
d0ac5fba | 490 | early_param("bootconfig", warn_bootconfig); |
7684b858 | 491 | |
a99cd112 | 492 | /* Change NUL term back to "=", to make "param" the whole string. */ |
7e2762e1 | 493 | static void __init repair_env_string(char *param, char *val) |
1da177e4 | 494 | { |
1da177e4 LT |
495 | 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); | |
1da177e4 LT |
502 | } else |
503 | BUG(); | |
504 | } | |
a99cd112 CM |
505 | } |
506 | ||
51e158c1 | 507 | /* Anything after -- gets handed straight to init. */ |
ecc86170 LR |
508 | static int __init set_init_arg(char *param, char *val, |
509 | const char *unused, void *arg) | |
51e158c1 RR |
510 | { |
511 | unsigned int i; | |
512 | ||
513 | if (panic_later) | |
514 | return 0; | |
515 | ||
7e2762e1 | 516 | repair_env_string(param, val); |
51e158c1 RR |
517 | |
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 | ||
a99cd112 CM |
529 | /* |
530 | * Unknown boot options get handed to init, unless they look like | |
531 | * unused parameters (modprobe will find them in /proc/cmdline). | |
532 | */ | |
ecc86170 LR |
533 | static int __init unknown_bootoption(char *param, char *val, |
534 | const char *unused, void *arg) | |
a99cd112 | 535 | { |
283900e8 AS |
536 | size_t len = strlen(param); |
537 | ||
7e2762e1 | 538 | repair_env_string(param, val); |
1da177e4 LT |
539 | |
540 | /* Handle obsolete-style parameters */ | |
541 | if (obsolete_checksetup(param)) | |
542 | return 0; | |
543 | ||
f066a4f6 | 544 | /* Unused module parameter. */ |
283900e8 | 545 | if (strnchr(param, len, '.')) |
1da177e4 | 546 | return 0; |
1da177e4 LT |
547 | |
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) { | |
499a4584 | 556 | panic_later = "env"; |
1da177e4 LT |
557 | panic_param = param; |
558 | } | |
283900e8 | 559 | if (!strncmp(param, envp_init[i], len+1)) |
1da177e4 LT |
560 | 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) { | |
499a4584 | 568 | panic_later = "init"; |
1da177e4 LT |
569 | panic_param = param; |
570 | } | |
571 | } | |
572 | argv_init[i] = param; | |
573 | } | |
574 | return 0; | |
575 | } | |
576 | ||
577 | static 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 | ||
ffdfc409 OJ |
594 | static 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 | ||
1da177e4 | 606 | #ifndef CONFIG_SMP |
34db18a0 | 607 | static const unsigned int setup_max_cpus = NR_CPUS; |
e0982e90 | 608 | static inline void setup_nr_cpu_ids(void) { } |
1da177e4 | 609 | static inline void smp_prepare_cpus(unsigned int maxcpus) { } |
1da177e4 LT |
610 | #endif |
611 | ||
30d7e0d4 ABL |
612 | /* |
613 | * 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 | */ | |
618 | static void __init setup_command_line(char *command_line) | |
619 | { | |
13199162 | 620 | size_t len, xlen = 0, ilen = 0; |
f5c7310a | 621 | |
51887d03 MH |
622 | if (extra_command_line) |
623 | xlen = strlen(extra_command_line); | |
13199162 MH |
624 | if (extra_init_args) |
625 | ilen = strlen(extra_init_args) + 4; /* for " -- " */ | |
f5c7310a | 626 | |
51887d03 | 627 | len = xlen + strlen(boot_command_line) + 1; |
f5c7310a | 628 | |
13199162 | 629 | saved_command_line = memblock_alloc(len + ilen, SMP_CACHE_BYTES); |
f5c7310a | 630 | if (!saved_command_line) |
13199162 | 631 | panic("%s: Failed to allocate %zu bytes\n", __func__, len + ilen); |
f5c7310a MR |
632 | |
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 | ||
51887d03 MH |
637 | 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); | |
13199162 MH |
648 | |
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. | |
b66fbbe8 MH |
654 | * The order should always be |
655 | * " -- "[bootconfig init-param][cmdline init-param] | |
13199162 | 656 | */ |
b66fbbe8 MH |
657 | if (initargs_offs) { |
658 | len = xlen + initargs_offs; | |
659 | strcpy(saved_command_line + len, extra_init_args); | |
660 | len += ilen - 4; /* strlen(extra_init_args) */ | |
661 | strcpy(saved_command_line + len, | |
662 | boot_command_line + initargs_offs - 1); | |
f61872bb | 663 | } else { |
b66fbbe8 | 664 | len = strlen(saved_command_line); |
13199162 MH |
665 | strcpy(saved_command_line + len, " -- "); |
666 | len += 4; | |
b66fbbe8 | 667 | strcpy(saved_command_line + len, extra_init_args); |
f61872bb | 668 | } |
13199162 | 669 | } |
30d7e0d4 ABL |
670 | } |
671 | ||
1da177e4 LT |
672 | /* |
673 | * We need to finalize in a non-__init function or else race conditions | |
674 | * between the root thread and the init thread may cause start_kernel to | |
675 | * be reaped by free_initmem before the root thread has proceeded to | |
676 | * cpu_idle. | |
677 | * | |
678 | * gcc-3.4 accidentally inlines this function, so use noinline. | |
679 | */ | |
680 | ||
b433c3d4 PZ |
681 | static __initdata DECLARE_COMPLETION(kthreadd_done); |
682 | ||
53c99bd6 | 683 | noinline void __ref rest_init(void) |
1da177e4 | 684 | { |
8fb12156 | 685 | struct task_struct *tsk; |
73c27992 EB |
686 | int pid; |
687 | ||
7db905e6 | 688 | rcu_scheduler_starting(); |
b433c3d4 | 689 | /* |
97158569 | 690 | * We need to spawn init first so that it obtains pid 1, however |
b433c3d4 PZ |
691 | * the init task will end up wanting to create kthreads, which, if |
692 | * we schedule it before we create kthreadd, will OOPS. | |
693 | */ | |
343f4c49 | 694 | pid = user_mode_thread(kernel_init, NULL, CLONE_FS); |
8fb12156 TG |
695 | /* |
696 | * Pin init on the boot CPU. Task migration is not properly working | |
697 | * until sched_init_smp() has been run. It will set the allowed | |
698 | * CPUs for init to the non isolated CPUs. | |
699 | */ | |
700 | rcu_read_lock(); | |
701 | tsk = find_task_by_pid_ns(pid, &init_pid_ns); | |
15faafc6 | 702 | tsk->flags |= PF_NO_SETAFFINITY; |
8fb12156 TG |
703 | set_cpus_allowed_ptr(tsk, cpumask_of(smp_processor_id())); |
704 | rcu_read_unlock(); | |
705 | ||
1da177e4 | 706 | numa_default_policy(); |
73c27992 | 707 | pid = kernel_thread(kthreadd, NULL, CLONE_FS | CLONE_FILES); |
d11c563d | 708 | rcu_read_lock(); |
5cd20455 | 709 | kthreadd_task = find_task_by_pid_ns(pid, &init_pid_ns); |
d11c563d | 710 | rcu_read_unlock(); |
1c3c5eab TG |
711 | |
712 | /* | |
713 | * Enable might_sleep() and smp_processor_id() checks. | |
c1a280b6 | 714 | * They cannot be enabled earlier because with CONFIG_PREEMPTION=y |
1c3c5eab TG |
715 | * kernel_thread() would trigger might_sleep() splats. With |
716 | * CONFIG_PREEMPT_VOLUNTARY=y the init task might have scheduled | |
717 | * already, but it's stuck on the kthreadd_done completion. | |
718 | */ | |
719 | system_state = SYSTEM_SCHEDULING; | |
720 | ||
b433c3d4 | 721 | complete(&kthreadd_done); |
f340c0d1 IM |
722 | |
723 | /* | |
724 | * The boot idle thread must execute schedule() | |
1df21055 | 725 | * at least once to get things moving: |
f340c0d1 | 726 | */ |
bd2f5536 | 727 | schedule_preempt_disabled(); |
5bfb5d69 | 728 | /* Call into cpu_idle with preempt disabled */ |
a1a04ec3 | 729 | cpu_startup_entry(CPUHP_ONLINE); |
1df21055 | 730 | } |
1da177e4 LT |
731 | |
732 | /* Check for early params. */ | |
ecc86170 LR |
733 | static int __init do_early_param(char *param, char *val, |
734 | const char *unused, void *arg) | |
1da177e4 | 735 | { |
914dcaa8 | 736 | const struct obs_kernel_param *p; |
1da177e4 LT |
737 | |
738 | for (p = __setup_start; p < __setup_end; p++) { | |
b1e4d20c | 739 | if ((p->early && parameq(param, p->str)) || |
18a8bd94 YL |
740 | (strcmp(param, "console") == 0 && |
741 | strcmp(p->str, "earlycon") == 0) | |
742 | ) { | |
1da177e4 | 743 | if (p->setup_func(val) != 0) |
ea676e84 | 744 | pr_warn("Malformed early option '%s'\n", param); |
1da177e4 LT |
745 | } |
746 | } | |
747 | /* We accept everything at this stage. */ | |
748 | return 0; | |
749 | } | |
750 | ||
13977091 MD |
751 | void __init parse_early_options(char *cmdline) |
752 | { | |
ecc86170 LR |
753 | parse_args("early options", cmdline, NULL, 0, 0, 0, NULL, |
754 | do_early_param); | |
13977091 MD |
755 | } |
756 | ||
1da177e4 LT |
757 | /* Arch code calls this early on, or if not, just before other parsing. */ |
758 | void __init parse_early_param(void) | |
759 | { | |
dd4d9fec FF |
760 | static int done __initdata; |
761 | static char tmp_cmdline[COMMAND_LINE_SIZE] __initdata; | |
1da177e4 LT |
762 | |
763 | if (done) | |
764 | return; | |
765 | ||
766 | /* All fall through to do_early_param. */ | |
a1d3a6d9 | 767 | strscpy(tmp_cmdline, boot_command_line, COMMAND_LINE_SIZE); |
13977091 | 768 | parse_early_options(tmp_cmdline); |
1da177e4 LT |
769 | done = 1; |
770 | } | |
771 | ||
e7ff3a47 TG |
772 | void __init __weak arch_post_acpi_subsys_init(void) { } |
773 | ||
839ad62e | 774 | void __init __weak smp_setup_processor_id(void) |
033ab7f8 AM |
775 | { |
776 | } | |
777 | ||
eded09cc | 778 | # if THREAD_SIZE >= PAGE_SIZE |
b235beea | 779 | void __init __weak thread_stack_cache_init(void) |
8c9843e5 BH |
780 | { |
781 | } | |
eded09cc | 782 | #endif |
8c9843e5 | 783 | |
c7753208 TL |
784 | void __init __weak mem_encrypt_init(void) { } |
785 | ||
4fc19708 NA |
786 | void __init __weak poking_init(void) { } |
787 | ||
782de70c | 788 | void __init __weak pgtable_cache_init(void) { } |
caa84136 | 789 | |
8b097881 KW |
790 | void __init __weak trap_init(void) { } |
791 | ||
4e37958d SRV |
792 | bool initcall_debug; |
793 | core_param(initcall_debug, initcall_debug, bool, 0644); | |
b0dc52f1 SRV |
794 | |
795 | #ifdef TRACEPOINTS_ENABLED | |
4e37958d | 796 | static void __init initcall_debug_enable(void); |
b0dc52f1 SRV |
797 | #else |
798 | static inline void initcall_debug_enable(void) | |
799 | { | |
800 | } | |
801 | #endif | |
4e37958d | 802 | |
23a5c8cb AP |
803 | /* Report memory auto-initialization states for this boot. */ |
804 | static void __init report_meminit(void) | |
805 | { | |
806 | const char *stack; | |
807 | ||
f0fe00d4 | 808 | if (IS_ENABLED(CONFIG_INIT_STACK_ALL_PATTERN)) |
809 | stack = "all(pattern)"; | |
810 | else if (IS_ENABLED(CONFIG_INIT_STACK_ALL_ZERO)) | |
811 | stack = "all(zero)"; | |
23a5c8cb | 812 | else if (IS_ENABLED(CONFIG_GCC_PLUGIN_STRUCTLEAK_BYREF_ALL)) |
f0fe00d4 | 813 | stack = "byref_all(zero)"; |
23a5c8cb | 814 | else if (IS_ENABLED(CONFIG_GCC_PLUGIN_STRUCTLEAK_BYREF)) |
f0fe00d4 | 815 | stack = "byref(zero)"; |
23a5c8cb | 816 | else if (IS_ENABLED(CONFIG_GCC_PLUGIN_STRUCTLEAK_USER)) |
f0fe00d4 | 817 | stack = "__user(zero)"; |
23a5c8cb AP |
818 | else |
819 | stack = "off"; | |
820 | ||
821 | pr_info("mem auto-init: stack:%s, heap alloc:%s, heap free:%s\n", | |
822 | stack, want_init_on_alloc(GFP_KERNEL) ? "on" : "off", | |
823 | want_init_on_free() ? "on" : "off"); | |
824 | if (want_init_on_free()) | |
825 | pr_info("mem auto-init: clearing system memory may take some time...\n"); | |
826 | } | |
827 | ||
444f478f PE |
828 | /* |
829 | * Set up kernel memory allocators | |
830 | */ | |
831 | static void __init mm_init(void) | |
832 | { | |
eefa864b JK |
833 | /* |
834 | * page_ext requires contiguous pages, | |
835 | * bigger than MAX_ORDER unless SPARSEMEM. | |
836 | */ | |
837 | page_ext_init_flatmem(); | |
04013513 | 838 | init_mem_debugging_and_hardening(); |
0ce20dd8 | 839 | kfence_alloc_pool(); |
23a5c8cb | 840 | report_meminit(); |
3c206509 | 841 | kmsan_init_shadow(); |
2dba5eb1 | 842 | stack_depot_early_init(); |
444f478f | 843 | mem_init(); |
1f9d03c5 | 844 | mem_init_print_info(); |
444f478f | 845 | kmem_cache_init(); |
2dba5eb1 VB |
846 | /* |
847 | * page_owner must be initialized after buddy is ready, and also after | |
848 | * slab is ready so that stack_depot_init() works properly | |
849 | */ | |
850 | page_ext_init_flatmem_late(); | |
c5665868 | 851 | kmemleak_init(); |
b35f1819 | 852 | pgtable_init(); |
a9ee3a63 | 853 | debug_objects_mem_init(); |
444f478f | 854 | vmalloc_init(); |
c4f20f14 LZ |
855 | /* Should be run after vmap initialization */ |
856 | if (early_page_ext_enabled()) | |
857 | page_ext_init(); | |
613e396b TG |
858 | /* Should be run before the first non-init thread is created */ |
859 | init_espfix_bsp(); | |
aa8c6248 TG |
860 | /* Should be run after espfix64 is set up. */ |
861 | pti_init(); | |
3c206509 | 862 | kmsan_init_runtime(); |
444f478f PE |
863 | } |
864 | ||
8cb37a59 | 865 | #ifdef CONFIG_RANDOMIZE_KSTACK_OFFSET |
39218ff4 KC |
866 | DEFINE_STATIC_KEY_MAYBE_RO(CONFIG_RANDOMIZE_KSTACK_OFFSET_DEFAULT, |
867 | randomize_kstack_offset); | |
868 | DEFINE_PER_CPU(u32, kstack_offset); | |
869 | ||
870 | static int __init early_randomize_kstack_offset(char *buf) | |
871 | { | |
872 | int ret; | |
873 | bool bool_result; | |
874 | ||
875 | ret = kstrtobool(buf, &bool_result); | |
876 | if (ret) | |
877 | return ret; | |
878 | ||
879 | if (bool_result) | |
880 | static_branch_enable(&randomize_kstack_offset); | |
881 | else | |
882 | static_branch_disable(&randomize_kstack_offset); | |
883 | return 0; | |
884 | } | |
885 | early_param("randomize_kstack_offset", early_randomize_kstack_offset); | |
886 | #endif | |
887 | ||
53c99bd6 MS |
888 | void __init __weak arch_call_rest_init(void) |
889 | { | |
890 | rest_init(); | |
891 | } | |
892 | ||
86d1919a AH |
893 | static void __init print_unknown_bootoptions(void) |
894 | { | |
895 | char *unknown_options; | |
896 | char *end; | |
897 | const char *const *p; | |
898 | size_t len; | |
899 | ||
900 | if (panic_later || (!argv_init[1] && !envp_init[2])) | |
901 | return; | |
902 | ||
903 | /* | |
904 | * Determine how many options we have to print out, plus a space | |
905 | * before each | |
906 | */ | |
907 | len = 1; /* null terminator */ | |
908 | for (p = &argv_init[1]; *p; p++) { | |
909 | len++; | |
910 | len += strlen(*p); | |
911 | } | |
912 | for (p = &envp_init[2]; *p; p++) { | |
913 | len++; | |
914 | len += strlen(*p); | |
915 | } | |
916 | ||
917 | unknown_options = memblock_alloc(len, SMP_CACHE_BYTES); | |
918 | if (!unknown_options) { | |
919 | pr_err("%s: Failed to allocate %zu bytes\n", | |
920 | __func__, len); | |
921 | return; | |
922 | } | |
923 | end = unknown_options; | |
924 | ||
925 | for (p = &argv_init[1]; *p; p++) | |
926 | end += sprintf(end, " %s", *p); | |
927 | for (p = &envp_init[2]; *p; p++) | |
928 | end += sprintf(end, " %s", *p); | |
929 | ||
8bc2b3dc AH |
930 | /* Start at unknown_options[1] to skip the initial space */ |
931 | pr_notice("Unknown kernel command line parameters \"%s\", will be passed to user space.\n", | |
932 | &unknown_options[1]); | |
4421cca0 | 933 | memblock_free(unknown_options, len); |
86d1919a AH |
934 | } |
935 | ||
f9409d58 | 936 | asmlinkage __visible void __init __no_sanitize_address start_kernel(void) |
1da177e4 | 937 | { |
dd4d9fec FF |
938 | char *command_line; |
939 | char *after_dashes; | |
033ab7f8 | 940 | |
d4311ff1 | 941 | set_task_stack_end_magic(&init_task); |
73839c5b | 942 | smp_setup_processor_id(); |
3ac7fe5a | 943 | debug_objects_early_init(); |
83cc6fa0 | 944 | init_vmlinux_build_id(); |
42059429 | 945 | |
ddbcc7e8 | 946 | cgroup_init_early(); |
fbb9ce95 IM |
947 | |
948 | local_irq_disable(); | |
2ce802f6 | 949 | early_boot_irqs_disabled = true; |
fbb9ce95 | 950 | |
1b3b3b49 VK |
951 | /* |
952 | * Interrupts are still disabled. Do necessary setups, then | |
953 | * enable them. | |
954 | */ | |
44fd2299 | 955 | boot_cpu_init(); |
1da177e4 | 956 | page_address_init(); |
ea676e84 | 957 | pr_notice("%s", linux_banner); |
e6b1db98 | 958 | early_security_init(); |
1da177e4 | 959 | setup_arch(&command_line); |
2b7d2fe7 | 960 | setup_boot_config(); |
30d7e0d4 | 961 | setup_command_line(command_line); |
e0982e90 | 962 | setup_nr_cpu_ids(); |
d6647bdf | 963 | setup_per_cpu_areas(); |
44fd2299 | 964 | smp_prepare_boot_cpu(); /* arch-specific boot-cpu hooks */ |
b5b1404d | 965 | boot_cpu_hotplug_init(); |
1da177e4 | 966 | |
72675e13 | 967 | build_all_zonelists(NULL); |
83b519e8 PE |
968 | page_alloc_init(); |
969 | ||
51887d03 | 970 | pr_notice("Kernel command line: %s\n", saved_command_line); |
6041186a DW |
971 | /* parameters may set static keys */ |
972 | jump_label_init(); | |
83b519e8 | 973 | parse_early_param(); |
51e158c1 RR |
974 | after_dashes = parse_args("Booting kernel", |
975 | static_command_line, __start___param, | |
976 | __stop___param - __start___param, | |
ecc86170 | 977 | -1, -1, NULL, &unknown_bootoption); |
86d1919a | 978 | print_unknown_bootoptions(); |
3438cf54 | 979 | if (!IS_ERR_OR_NULL(after_dashes)) |
51e158c1 | 980 | parse_args("Setting init args", after_dashes, NULL, 0, -1, -1, |
ecc86170 | 981 | NULL, set_init_arg); |
13199162 MH |
982 | if (extra_init_args) |
983 | parse_args("Setting extra init args", extra_init_args, | |
984 | NULL, 0, -1, -1, NULL, set_init_arg); | |
97ce2c88 | 985 | |
f6238499 JD |
986 | /* Architectural and non-timekeeping rng init, before allocator init */ |
987 | random_init_early(command_line); | |
988 | ||
83b519e8 PE |
989 | /* |
990 | * These use large bootmem allocations and must precede | |
991 | * kmem_cache_init() | |
992 | */ | |
162a7e75 | 993 | setup_log_buf(0); |
83b519e8 PE |
994 | vfs_caches_init_early(); |
995 | sort_main_extable(); | |
996 | trap_init(); | |
444f478f | 997 | mm_init(); |
de03c72c | 998 | |
f631718d SRV |
999 | ftrace_init(); |
1000 | ||
e725c731 SRV |
1001 | /* trace_printk can be enabled here */ |
1002 | early_trace_init(); | |
1003 | ||
1da177e4 LT |
1004 | /* |
1005 | * Set up the scheduler prior starting any interrupts (such as the | |
1006 | * timer interrupt). Full topology setup happens at smp_init() | |
1007 | * time - but meanwhile we still have a functioning scheduler. | |
1008 | */ | |
1009 | sched_init(); | |
f1a0a376 | 1010 | |
dd4d9fec FF |
1011 | if (WARN(!irqs_disabled(), |
1012 | "Interrupts were enabled *very* early, fixing it\n")) | |
c4a68306 | 1013 | local_irq_disable(); |
0a835c4f | 1014 | radix_tree_init(); |
54a611b6 | 1015 | maple_tree_init(); |
3347fa09 | 1016 | |
7d229c66 TS |
1017 | /* |
1018 | * Set up housekeeping before setting up workqueues to allow the unbound | |
1019 | * workqueue to take non-housekeeping into account. | |
1020 | */ | |
1021 | housekeeping_init(); | |
1022 | ||
3347fa09 TH |
1023 | /* |
1024 | * Allow workqueue creation and work item queueing/cancelling | |
1025 | * early. Work item execution depends on kthreads and starts after | |
1026 | * workqueue_init(). | |
1027 | */ | |
1028 | workqueue_init_early(); | |
1029 | ||
1da177e4 | 1030 | rcu_init(); |
5f893b26 | 1031 | |
e725c731 | 1032 | /* Trace events are available after this */ |
5f893b26 SRRH |
1033 | trace_init(); |
1034 | ||
4e37958d SRV |
1035 | if (initcall_debug) |
1036 | initcall_debug_enable(); | |
1037 | ||
65f382fd | 1038 | context_tracking_init(); |
0b8f1efa YL |
1039 | /* init some links before init_ISA_irqs() */ |
1040 | early_irq_init(); | |
1da177e4 | 1041 | init_IRQ(); |
ad2b1353 | 1042 | tick_init(); |
d6dd50e0 | 1043 | rcu_init_nohz(); |
1da177e4 | 1044 | init_timers(); |
8e9c01c7 | 1045 | srcu_init(); |
c0a31329 | 1046 | hrtimers_init(); |
1da177e4 | 1047 | softirq_init(); |
ad596171 | 1048 | timekeeping_init(); |
fe222a6c | 1049 | time_init(); |
d5553523 | 1050 | |
f6238499 JD |
1051 | /* This must be after timekeeping is initialized */ |
1052 | random_init(); | |
1053 | ||
1054 | /* These make use of the fully initialized rng */ | |
1055 | kfence_init(); | |
d5553523 KC |
1056 | boot_init_stack_canary(); |
1057 | ||
9e630205 | 1058 | perf_event_init(); |
93e02814 | 1059 | profile_init(); |
d8ad7d11 | 1060 | call_function_init(); |
f91eb62f | 1061 | WARN(!irqs_disabled(), "Interrupts were enabled early\n"); |
c3bc8fd6 | 1062 | |
2ce802f6 | 1063 | early_boot_irqs_disabled = false; |
93e02814 | 1064 | local_irq_enable(); |
dcce284a | 1065 | |
7e85ee0c | 1066 | kmem_cache_init_late(); |
1da177e4 LT |
1067 | |
1068 | /* | |
1069 | * HACK ALERT! This is early. We're enabling the console before | |
1070 | * we've done PCI setups etc, and console_init() must be aware of | |
1071 | * this. But we do want output early, in case something goes wrong. | |
1072 | */ | |
1073 | console_init(); | |
1074 | if (panic_later) | |
499a4584 TH |
1075 | panic("Too many boot %s vars at `%s'", panic_later, |
1076 | panic_param); | |
fbb9ce95 | 1077 | |
c3bc8fd6 | 1078 | lockdep_init(); |
fbb9ce95 | 1079 | |
9a11b49a IM |
1080 | /* |
1081 | * Need to run this when irqs are enabled, because it wants | |
1082 | * to self-test [hard/soft]-irqs on/off lock inversion bugs | |
1083 | * too: | |
1084 | */ | |
1085 | locking_selftest(); | |
1086 | ||
c7753208 TL |
1087 | /* |
1088 | * This needs to be called before any devices perform DMA | |
1089 | * operations that might use the SWIOTLB bounce buffers. It will | |
1090 | * mark the bounce buffers as decrypted so that their usage will | |
1091 | * not cause "plain-text" data to be decrypted when accessed. | |
1092 | */ | |
1093 | mem_encrypt_init(); | |
1094 | ||
1da177e4 LT |
1095 | #ifdef CONFIG_BLK_DEV_INITRD |
1096 | if (initrd_start && !initrd_below_start_ok && | |
bd673c7c | 1097 | page_to_pfn(virt_to_page((void *)initrd_start)) < min_low_pfn) { |
ea676e84 | 1098 | pr_crit("initrd overwritten (0x%08lx < 0x%08lx) - disabling it.\n", |
bd673c7c GU |
1099 | page_to_pfn(virt_to_page((void *)initrd_start)), |
1100 | min_low_pfn); | |
1da177e4 LT |
1101 | initrd_start = 0; |
1102 | } | |
1103 | #endif | |
e7c8d5c9 | 1104 | setup_per_cpu_pageset(); |
1da177e4 | 1105 | numa_policy_init(); |
9c71206d | 1106 | acpi_early_init(); |
1da177e4 LT |
1107 | if (late_time_init) |
1108 | late_time_init(); | |
857baa87 | 1109 | sched_clock_init(); |
1da177e4 | 1110 | calibrate_delay(); |
95846ecf | 1111 | pid_idr_init(); |
1da177e4 | 1112 | anon_vma_init(); |
11520e5e | 1113 | #ifdef CONFIG_X86 |
83e68189 | 1114 | if (efi_enabled(EFI_RUNTIME_SERVICES)) |
11520e5e LT |
1115 | efi_enter_virtual_mode(); |
1116 | #endif | |
b235beea | 1117 | thread_stack_cache_init(); |
d84f4f99 | 1118 | cred_init(); |
ff691f6e | 1119 | fork_init(); |
1da177e4 | 1120 | proc_caches_init(); |
3ea056c5 | 1121 | uts_ns_init(); |
1da177e4 LT |
1122 | key_init(); |
1123 | security_init(); | |
0b4b3827 | 1124 | dbg_late_init(); |
9c1be193 | 1125 | net_ns_init(); |
4248b0da | 1126 | vfs_caches_init(); |
62906027 | 1127 | pagecache_init(); |
1da177e4 | 1128 | signals_init(); |
09652320 | 1129 | seq_file_init(); |
1da177e4 | 1130 | proc_root_init(); |
e149ed2b | 1131 | nsfs_init(); |
1da177e4 | 1132 | cpuset_init(); |
695df213 | 1133 | cgroup_init(); |
c757249a | 1134 | taskstats_init_early(); |
ca74e92b | 1135 | delayacct_init(); |
1da177e4 | 1136 | |
4fc19708 | 1137 | poking_init(); |
1da177e4 LT |
1138 | check_bugs(); |
1139 | ||
b064a8fa | 1140 | acpi_subsystem_init(); |
e7ff3a47 | 1141 | arch_post_acpi_subsys_init(); |
dfd402a4 | 1142 | kcsan_init(); |
1da177e4 LT |
1143 | |
1144 | /* Do the rest non-__init'ed, we're now alive */ | |
53c99bd6 | 1145 | arch_call_rest_init(); |
a9a3ed1e BP |
1146 | |
1147 | prevent_tail_call_optimization(); | |
1da177e4 LT |
1148 | } |
1149 | ||
b99b87f7 PO |
1150 | /* Call all constructor functions linked into the kernel. */ |
1151 | static void __init do_ctors(void) | |
1152 | { | |
55b6f763 JB |
1153 | /* |
1154 | * For UML, the constructors have already been called by the | |
1155 | * normal setup code as it's just a normal ELF binary, so we | |
1156 | * cannot do it again - but we do need CONFIG_CONSTRUCTORS | |
1157 | * even on UML for modules. | |
1158 | */ | |
1159 | #if defined(CONFIG_CONSTRUCTORS) && !defined(CONFIG_UML) | |
196a15b4 | 1160 | ctor_fn_t *fn = (ctor_fn_t *) __ctors_start; |
b99b87f7 | 1161 | |
196a15b4 HS |
1162 | for (; fn < (ctor_fn_t *) __ctors_end; fn++) |
1163 | (*fn)(); | |
b99b87f7 PO |
1164 | #endif |
1165 | } | |
1166 | ||
7b0b73d7 PB |
1167 | #ifdef CONFIG_KALLSYMS |
1168 | struct blacklist_entry { | |
1169 | struct list_head next; | |
1170 | char *buf; | |
1171 | }; | |
1172 | ||
1173 | static __initdata_or_module LIST_HEAD(blacklisted_initcalls); | |
1174 | ||
1175 | static int __init initcall_blacklist(char *str) | |
1176 | { | |
1177 | char *str_entry; | |
1178 | struct blacklist_entry *entry; | |
1179 | ||
1180 | /* str argument is a comma-separated list of functions */ | |
1181 | do { | |
1182 | str_entry = strsep(&str, ","); | |
1183 | if (str_entry) { | |
1184 | pr_debug("blacklisting initcall %s\n", str_entry); | |
7e1c4e27 MR |
1185 | entry = memblock_alloc(sizeof(*entry), |
1186 | SMP_CACHE_BYTES); | |
f5c7310a MR |
1187 | if (!entry) |
1188 | panic("%s: Failed to allocate %zu bytes\n", | |
1189 | __func__, sizeof(*entry)); | |
7e1c4e27 MR |
1190 | entry->buf = memblock_alloc(strlen(str_entry) + 1, |
1191 | SMP_CACHE_BYTES); | |
f5c7310a MR |
1192 | if (!entry->buf) |
1193 | panic("%s: Failed to allocate %zu bytes\n", | |
1194 | __func__, strlen(str_entry) + 1); | |
7b0b73d7 PB |
1195 | strcpy(entry->buf, str_entry); |
1196 | list_add(&entry->next, &blacklisted_initcalls); | |
1197 | } | |
1198 | } while (str_entry); | |
1199 | ||
f9a40b08 | 1200 | return 1; |
7b0b73d7 PB |
1201 | } |
1202 | ||
1203 | static bool __init_or_module initcall_blacklisted(initcall_t fn) | |
1204 | { | |
7b0b73d7 | 1205 | struct blacklist_entry *entry; |
c8cdd2be | 1206 | char fn_name[KSYM_SYMBOL_LEN]; |
0fd5ed8d | 1207 | unsigned long addr; |
7b0b73d7 | 1208 | |
c8cdd2be | 1209 | if (list_empty(&blacklisted_initcalls)) |
7b0b73d7 PB |
1210 | return false; |
1211 | ||
0fd5ed8d RV |
1212 | addr = (unsigned long) dereference_function_descriptor(fn); |
1213 | sprint_symbol_no_offset(fn_name, addr); | |
c8cdd2be | 1214 | |
841c06d7 PB |
1215 | /* |
1216 | * fn will be "function_name [module_name]" where [module_name] is not | |
1217 | * displayed for built-in init functions. Strip off the [module_name]. | |
1218 | */ | |
1219 | strreplace(fn_name, ' ', '\0'); | |
1220 | ||
e6fd1fb3 | 1221 | list_for_each_entry(entry, &blacklisted_initcalls, next) { |
7b0b73d7 PB |
1222 | if (!strcmp(fn_name, entry->buf)) { |
1223 | pr_debug("initcall %s blacklisted\n", fn_name); | |
7b0b73d7 PB |
1224 | return true; |
1225 | } | |
1226 | } | |
1227 | ||
7b0b73d7 PB |
1228 | return false; |
1229 | } | |
1230 | #else | |
1231 | static int __init initcall_blacklist(char *str) | |
1232 | { | |
1233 | pr_warn("initcall_blacklist requires CONFIG_KALLSYMS\n"); | |
1234 | return 0; | |
1235 | } | |
1236 | ||
1237 | static bool __init_or_module initcall_blacklisted(initcall_t fn) | |
1238 | { | |
1239 | return false; | |
1240 | } | |
1241 | #endif | |
1242 | __setup("initcall_blacklist=", initcall_blacklist); | |
1243 | ||
4e37958d SRV |
1244 | static __init_or_module void |
1245 | trace_initcall_start_cb(void *data, initcall_t fn) | |
1da177e4 | 1246 | { |
374d6cda | 1247 | ktime_t *calltime = data; |
1da177e4 | 1248 | |
58e2cf5d | 1249 | printk(KERN_DEBUG "calling %pS @ %i\n", fn, task_pid_nr(current)); |
4e37958d SRV |
1250 | *calltime = ktime_get(); |
1251 | } | |
1252 | ||
1253 | static __init_or_module void | |
1254 | trace_initcall_finish_cb(void *data, initcall_t fn, int ret) | |
1255 | { | |
374d6cda | 1256 | ktime_t rettime, *calltime = data; |
4e37958d | 1257 | |
22c5c03b | 1258 | rettime = ktime_get(); |
58e2cf5d | 1259 | printk(KERN_DEBUG "initcall %pS returned %d after %lld usecs\n", |
105e8c2e | 1260 | fn, ret, (unsigned long long)ktime_us_delta(rettime, *calltime)); |
4e37958d | 1261 | } |
1da177e4 | 1262 | |
4e37958d SRV |
1263 | static ktime_t initcall_calltime; |
1264 | ||
b0dc52f1 | 1265 | #ifdef TRACEPOINTS_ENABLED |
4e37958d SRV |
1266 | static void __init initcall_debug_enable(void) |
1267 | { | |
1268 | int ret; | |
1269 | ||
1270 | ret = register_trace_initcall_start(trace_initcall_start_cb, | |
1271 | &initcall_calltime); | |
1272 | ret |= register_trace_initcall_finish(trace_initcall_finish_cb, | |
1273 | &initcall_calltime); | |
1274 | WARN(ret, "Failed to register initcall tracepoints\n"); | |
22c5c03b | 1275 | } |
b0dc52f1 SRV |
1276 | # define do_trace_initcall_start trace_initcall_start |
1277 | # define do_trace_initcall_finish trace_initcall_finish | |
1278 | #else | |
1279 | static inline void do_trace_initcall_start(initcall_t fn) | |
1280 | { | |
1281 | if (!initcall_debug) | |
1282 | return; | |
1283 | trace_initcall_start_cb(&initcall_calltime, fn); | |
1284 | } | |
1285 | static inline void do_trace_initcall_finish(initcall_t fn, int ret) | |
1286 | { | |
1287 | if (!initcall_debug) | |
1288 | return; | |
1289 | trace_initcall_finish_cb(&initcall_calltime, fn, ret); | |
1290 | } | |
1291 | #endif /* !TRACEPOINTS_ENABLED */ | |
22c5c03b | 1292 | |
e4461271 | 1293 | int __init_or_module do_one_initcall(initcall_t fn) |
22c5c03b KW |
1294 | { |
1295 | int count = preempt_count(); | |
ff1c8fac | 1296 | char msgbuf[64]; |
4e37958d | 1297 | int ret; |
22c5c03b | 1298 | |
7b0b73d7 PB |
1299 | if (initcall_blacklisted(fn)) |
1300 | return -EPERM; | |
1301 | ||
b0dc52f1 | 1302 | do_trace_initcall_start(fn); |
4e37958d | 1303 | ret = fn(); |
b0dc52f1 | 1304 | do_trace_initcall_finish(fn, ret); |
8f0c45cd | 1305 | |
e0df154f | 1306 | msgbuf[0] = 0; |
e662e1cf | 1307 | |
e0df154f | 1308 | if (preempt_count() != count) { |
bf5d770b | 1309 | sprintf(msgbuf, "preemption imbalance "); |
4a2b4b22 | 1310 | preempt_count_set(count); |
1da177e4 | 1311 | } |
e0df154f | 1312 | if (irqs_disabled()) { |
a76bfd0d | 1313 | strlcat(msgbuf, "disabled interrupts ", sizeof(msgbuf)); |
e0df154f LT |
1314 | local_irq_enable(); |
1315 | } | |
d75f773c | 1316 | WARN(msgbuf[0], "initcall %pS returned with %s\n", fn, msgbuf); |
59f9415f | 1317 | |
38addce8 | 1318 | add_latent_entropy(); |
30dbb20e | 1319 | return ret; |
e0df154f LT |
1320 | } |
1321 | ||
1322 | ||
1b1eeca7 AB |
1323 | extern initcall_entry_t __initcall_start[]; |
1324 | extern initcall_entry_t __initcall0_start[]; | |
1325 | extern initcall_entry_t __initcall1_start[]; | |
1326 | extern initcall_entry_t __initcall2_start[]; | |
1327 | extern initcall_entry_t __initcall3_start[]; | |
1328 | extern initcall_entry_t __initcall4_start[]; | |
1329 | extern initcall_entry_t __initcall5_start[]; | |
1330 | extern initcall_entry_t __initcall6_start[]; | |
1331 | extern initcall_entry_t __initcall7_start[]; | |
1332 | extern initcall_entry_t __initcall_end[]; | |
1333 | ||
1334 | static initcall_entry_t *initcall_levels[] __initdata = { | |
026cee00 PM |
1335 | __initcall0_start, |
1336 | __initcall1_start, | |
1337 | __initcall2_start, | |
1338 | __initcall3_start, | |
1339 | __initcall4_start, | |
1340 | __initcall5_start, | |
1341 | __initcall6_start, | |
1342 | __initcall7_start, | |
1343 | __initcall_end, | |
1344 | }; | |
1345 | ||
96263d28 | 1346 | /* Keep these in sync with initcalls in include/linux/init.h */ |
7c8f7193 | 1347 | static const char *initcall_level_names[] __initdata = { |
a6fb6012 | 1348 | "pure", |
9fb48c74 JC |
1349 | "core", |
1350 | "postcore", | |
1351 | "arch", | |
1352 | "subsys", | |
1353 | "fs", | |
1354 | "device", | |
1355 | "late", | |
026cee00 PM |
1356 | }; |
1357 | ||
7e2762e1 AS |
1358 | static int __init ignore_unknown_bootoption(char *param, char *val, |
1359 | const char *unused, void *arg) | |
1360 | { | |
1361 | return 0; | |
1362 | } | |
1363 | ||
0068c92a | 1364 | static void __init do_initcall_level(int level, char *command_line) |
e0df154f | 1365 | { |
1b1eeca7 | 1366 | initcall_entry_t *fn; |
e0df154f | 1367 | |
026cee00 | 1368 | parse_args(initcall_level_names[level], |
0068c92a | 1369 | command_line, __start___param, |
026cee00 PM |
1370 | __stop___param - __start___param, |
1371 | level, level, | |
7e2762e1 | 1372 | NULL, ignore_unknown_bootoption); |
026cee00 | 1373 | |
4ee7c60d | 1374 | trace_initcall_level(initcall_level_names[level]); |
026cee00 | 1375 | for (fn = initcall_levels[level]; fn < initcall_levels[level+1]; fn++) |
1b1eeca7 | 1376 | do_one_initcall(initcall_from_entry(fn)); |
1da177e4 LT |
1377 | } |
1378 | ||
026cee00 PM |
1379 | static void __init do_initcalls(void) |
1380 | { | |
1381 | int level; | |
0068c92a MH |
1382 | size_t len = strlen(saved_command_line) + 1; |
1383 | char *command_line; | |
1384 | ||
1385 | command_line = kzalloc(len, GFP_KERNEL); | |
1386 | if (!command_line) | |
1387 | panic("%s: Failed to allocate %zu bytes\n", __func__, len); | |
1388 | ||
1389 | for (level = 0; level < ARRAY_SIZE(initcall_levels) - 1; level++) { | |
1390 | /* Parser modifies command_line, restore it each time */ | |
1391 | strcpy(command_line, saved_command_line); | |
1392 | do_initcall_level(level, command_line); | |
1393 | } | |
026cee00 | 1394 | |
0068c92a | 1395 | kfree(command_line); |
026cee00 PM |
1396 | } |
1397 | ||
1da177e4 LT |
1398 | /* |
1399 | * Ok, the machine is now initialized. None of the devices | |
1400 | * have been touched yet, but the CPU subsystem is up and | |
1401 | * running, and memory and process management works. | |
1402 | * | |
1403 | * Now we can finally start doing some real work.. | |
1404 | */ | |
1405 | static void __init do_basic_setup(void) | |
1406 | { | |
759ee091 | 1407 | cpuset_init_smp(); |
1da177e4 | 1408 | driver_init(); |
b04c3afb | 1409 | init_irq_proc(); |
b99b87f7 | 1410 | do_ctors(); |
b0f84374 | 1411 | do_initcalls(); |
1da177e4 LT |
1412 | } |
1413 | ||
7babe8db | 1414 | static void __init do_pre_smp_initcalls(void) |
c2147a50 | 1415 | { |
1b1eeca7 | 1416 | initcall_entry_t *fn; |
c2147a50 | 1417 | |
4ee7c60d | 1418 | trace_initcall_level("early"); |
026cee00 | 1419 | for (fn = __initcall_start; fn < __initcall0_start; fn++) |
1b1eeca7 | 1420 | do_one_initcall(initcall_from_entry(fn)); |
c2147a50 EGM |
1421 | } |
1422 | ||
a74fb73c | 1423 | static int run_init_process(const char *init_filename) |
1da177e4 | 1424 | { |
b88c50ac AS |
1425 | const char *const *p; |
1426 | ||
1da177e4 | 1427 | argv_init[0] = init_filename; |
3f5c15d8 | 1428 | pr_info("Run %s as init process\n", init_filename); |
b88c50ac AS |
1429 | pr_debug(" with arguments:\n"); |
1430 | for (p = argv_init; *p; p++) | |
1431 | pr_debug(" %s\n", *p); | |
1432 | pr_debug(" with environment:\n"); | |
1433 | for (p = envp_init; *p; p++) | |
1434 | pr_debug(" %s\n", *p); | |
be619f7f | 1435 | return kernel_execve(init_filename, argv_init, envp_init); |
1da177e4 LT |
1436 | } |
1437 | ||
ba24762b MO |
1438 | static int try_to_run_init_process(const char *init_filename) |
1439 | { | |
1440 | int ret; | |
1441 | ||
1442 | ret = run_init_process(init_filename); | |
1443 | ||
1444 | if (ret && ret != -ENOENT) { | |
1445 | pr_err("Starting init: %s exists but couldn't execute it (error %d)\n", | |
1446 | init_filename, ret); | |
1447 | } | |
1448 | ||
1449 | return ret; | |
1450 | } | |
1451 | ||
f80b0c90 | 1452 | static noinline void __init kernel_init_freeable(void); |
d6b21238 | 1453 | |
0f5bf6d0 | 1454 | #if defined(CONFIG_STRICT_KERNEL_RWX) || defined(CONFIG_STRICT_MODULE_RWX) |
39290b38 | 1455 | bool rodata_enabled __ro_after_init = true; |
2e8cff0a MR |
1456 | |
1457 | #ifndef arch_parse_debug_rodata | |
1458 | static inline bool arch_parse_debug_rodata(char *str) { return false; } | |
1459 | #endif | |
1460 | ||
d2aa1aca KC |
1461 | static int __init set_debug_rodata(char *str) |
1462 | { | |
2e8cff0a MR |
1463 | if (arch_parse_debug_rodata(str)) |
1464 | return 0; | |
1465 | ||
1466 | if (str && !strcmp(str, "on")) | |
1467 | rodata_enabled = true; | |
1468 | else if (str && !strcmp(str, "off")) | |
1469 | rodata_enabled = false; | |
1470 | else | |
f9a40b08 | 1471 | pr_warn("Invalid option string for rodata: '%s'\n", str); |
2e8cff0a | 1472 | return 0; |
d2aa1aca | 1473 | } |
2e8cff0a | 1474 | early_param("rodata", set_debug_rodata); |
39290b38 | 1475 | #endif |
d2aa1aca | 1476 | |
0f5bf6d0 | 1477 | #ifdef CONFIG_STRICT_KERNEL_RWX |
d2aa1aca KC |
1478 | static void mark_readonly(void) |
1479 | { | |
2959a5f7 | 1480 | if (rodata_enabled) { |
ae646f0b | 1481 | /* |
ba180314 PM |
1482 | * load_module() results in W+X mappings, which are cleaned |
1483 | * up with call_rcu(). Let's make sure that queued work is | |
ae646f0b JH |
1484 | * flushed so that we don't hit false positives looking for |
1485 | * insecure pages which are W+X. | |
1486 | */ | |
ba180314 | 1487 | rcu_barrier(); |
d2aa1aca | 1488 | mark_rodata_ro(); |
2959a5f7 JP |
1489 | rodata_test(); |
1490 | } else | |
d2aa1aca KC |
1491 | pr_info("Kernel memory protection disabled.\n"); |
1492 | } | |
f596ded1 CL |
1493 | #elif defined(CONFIG_ARCH_HAS_STRICT_KERNEL_RWX) |
1494 | static inline void mark_readonly(void) | |
1495 | { | |
1496 | pr_warn("Kernel memory protection not selected by kernel config.\n"); | |
1497 | } | |
d2aa1aca KC |
1498 | #else |
1499 | static inline void mark_readonly(void) | |
1500 | { | |
1501 | pr_warn("This architecture does not have kernel memory protection.\n"); | |
1502 | } | |
1503 | #endif | |
1504 | ||
997aef68 MR |
1505 | void __weak free_initmem(void) |
1506 | { | |
f4039999 | 1507 | free_initmem_default(POISON_FREE_INITMEM); |
997aef68 MR |
1508 | } |
1509 | ||
d6b21238 | 1510 | static int __ref kernel_init(void *unused) |
ee5bfa64 | 1511 | { |
ba24762b MO |
1512 | int ret; |
1513 | ||
15faafc6 PZ |
1514 | /* |
1515 | * Wait until kthreadd is all set-up. | |
1516 | */ | |
1517 | wait_for_completion(&kthreadd_done); | |
1518 | ||
d6b21238 | 1519 | kernel_init_freeable(); |
22a9d645 AV |
1520 | /* need to finish all async __init code before freeing the memory */ |
1521 | async_synchronize_full(); | |
d2635f20 CL |
1522 | |
1523 | system_state = SYSTEM_FREEING_INITMEM; | |
82d083ab | 1524 | kprobe_free_init_mem(); |
b80f0f6c | 1525 | ftrace_free_init_mem(); |
d54ce615 | 1526 | kgdb_free_init_mem(); |
40caa127 | 1527 | exit_boot_config(); |
ee5bfa64 | 1528 | free_initmem(); |
d2aa1aca | 1529 | mark_readonly(); |
b976690f JR |
1530 | |
1531 | /* | |
1532 | * Kernel mappings are now finalized - update the userspace page-table | |
1533 | * to finalize PTI. | |
1534 | */ | |
1535 | pti_finalize(); | |
1536 | ||
ee5bfa64 VG |
1537 | system_state = SYSTEM_RUNNING; |
1538 | numa_default_policy(); | |
1539 | ||
967dcb8f PM |
1540 | rcu_end_inkernel_boot(); |
1541 | ||
3db978d4 VB |
1542 | do_sysctl_args(); |
1543 | ||
ee5bfa64 | 1544 | if (ramdisk_execute_command) { |
ba24762b MO |
1545 | ret = run_init_process(ramdisk_execute_command); |
1546 | if (!ret) | |
a74fb73c | 1547 | return 0; |
ba24762b MO |
1548 | pr_err("Failed to execute %s (error %d)\n", |
1549 | ramdisk_execute_command, ret); | |
ee5bfa64 VG |
1550 | } |
1551 | ||
1552 | /* | |
1553 | * We try each of these until one succeeds. | |
1554 | * | |
1555 | * The Bourne shell can be used instead of init if we are | |
1556 | * trying to recover a really broken machine. | |
1557 | */ | |
1558 | if (execute_command) { | |
ba24762b MO |
1559 | ret = run_init_process(execute_command); |
1560 | if (!ret) | |
a74fb73c | 1561 | return 0; |
6ef4536e AL |
1562 | panic("Requested init %s failed (error %d).", |
1563 | execute_command, ret); | |
ee5bfa64 | 1564 | } |
ada4ab7a CD |
1565 | |
1566 | if (CONFIG_DEFAULT_INIT[0] != '\0') { | |
1567 | ret = run_init_process(CONFIG_DEFAULT_INIT); | |
1568 | if (ret) | |
1569 | pr_err("Default init %s failed (error %d)\n", | |
1570 | CONFIG_DEFAULT_INIT, ret); | |
1571 | else | |
1572 | return 0; | |
1573 | } | |
1574 | ||
ba24762b MO |
1575 | if (!try_to_run_init_process("/sbin/init") || |
1576 | !try_to_run_init_process("/etc/init") || | |
1577 | !try_to_run_init_process("/bin/init") || | |
1578 | !try_to_run_init_process("/bin/sh")) | |
a74fb73c | 1579 | return 0; |
ee5bfa64 | 1580 | |
ba24762b | 1581 | panic("No working init found. Try passing init= option to kernel. " |
8c27ceff | 1582 | "See Linux Documentation/admin-guide/init.rst for guidance."); |
ee5bfa64 VG |
1583 | } |
1584 | ||
8f740636 | 1585 | /* Open /dev/console, for stdin/stdout/stderr, this should never fail */ |
a94b5214 | 1586 | void __init console_on_rootfs(void) |
b49a733d | 1587 | { |
8f740636 | 1588 | struct file *file = filp_open("/dev/console", O_RDWR, 0); |
b49a733d | 1589 | |
8f740636 | 1590 | if (IS_ERR(file)) { |
a91bd622 PM |
1591 | pr_err("Warning: unable to open an initial console.\n"); |
1592 | return; | |
8f740636 | 1593 | } |
f0735310 CH |
1594 | init_dup(file); |
1595 | init_dup(file); | |
1596 | init_dup(file); | |
1597 | fput(file); | |
b49a733d DB |
1598 | } |
1599 | ||
f80b0c90 | 1600 | static noinline void __init kernel_init_freeable(void) |
1da177e4 | 1601 | { |
31a67102 LT |
1602 | /* Now the scheduler is fully set up and can do blocking allocations */ |
1603 | gfp_allowed_mask = __GFP_BITS_MASK; | |
1604 | ||
58568d2a MX |
1605 | /* |
1606 | * init can allocate pages on any node | |
1607 | */ | |
3c466d46 | 1608 | set_mems_allowed(node_states[N_MEMORY]); |
1da177e4 | 1609 | |
0711f0d7 | 1610 | cad_pid = get_pid(task_pid(current)); |
9ec52099 | 1611 | |
ca74a6f8 | 1612 | smp_prepare_cpus(setup_max_cpus); |
1da177e4 | 1613 | |
3347fa09 TH |
1614 | workqueue_init(); |
1615 | ||
597b7305 MH |
1616 | init_mm_internals(); |
1617 | ||
1b04fa99 | 1618 | rcu_init_tasks_generic(); |
1da177e4 | 1619 | do_pre_smp_initcalls(); |
004417a6 | 1620 | lockup_detector_init(); |
1da177e4 | 1621 | |
1da177e4 LT |
1622 | smp_init(); |
1623 | sched_init_smp(); | |
1624 | ||
f1b192b1 | 1625 | padata_init(); |
0e1cc95b | 1626 | page_alloc_init_late(); |
2f1ee091 | 1627 | /* Initialize page ext after all struct pages are initialized. */ |
c4f20f14 LZ |
1628 | if (!early_page_ext_enabled()) |
1629 | page_ext_init(); | |
0e1cc95b | 1630 | |
1da177e4 LT |
1631 | do_basic_setup(); |
1632 | ||
8c0d8849 BH |
1633 | kunit_run_all_tests(); |
1634 | ||
e7cb072e | 1635 | wait_for_initramfs(); |
b49a733d | 1636 | console_on_rootfs(); |
2bd3a997 | 1637 | |
1da177e4 LT |
1638 | /* |
1639 | * check if there is an early userspace init. If yes, let it do all | |
1640 | * the work | |
1641 | */ | |
eb9d7d39 | 1642 | if (init_eaccess(ramdisk_execute_command) != 0) { |
ffdfc409 | 1643 | ramdisk_execute_command = NULL; |
1da177e4 | 1644 | prepare_namespace(); |
ffdfc409 | 1645 | } |
1da177e4 LT |
1646 | |
1647 | /* | |
1648 | * Ok, we have completed the initial bootup, and | |
1649 | * we're essentially up and running. Get rid of the | |
1650 | * initmem segments and start the user-mode stuff.. | |
c9cd2ce2 DK |
1651 | * |
1652 | * rootfs is available now, try loading the public keys | |
1653 | * and default modules | |
1da177e4 | 1654 | */ |
bb813f4c | 1655 | |
c9cd2ce2 | 1656 | integrity_load_keys(); |
1da177e4 | 1657 | } |