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> | |
9a11b49a | 65 | #include <linux/debug_locks.h> |
3ac7fe5a | 66 | #include <linux/debugobjects.h> |
fbb9ce95 | 67 | #include <linux/lockdep.h> |
3c7b4e6b | 68 | #include <linux/kmemleak.h> |
f1b192b1 | 69 | #include <linux/padata.h> |
84d73786 | 70 | #include <linux/pid_namespace.h> |
4c002c97 | 71 | #include <linux/device/driver.h> |
73c27992 | 72 | #include <linux/kthread.h> |
e6fe6649 | 73 | #include <linux/sched.h> |
1777e463 | 74 | #include <linux/sched/init.h> |
a1c9eea9 | 75 | #include <linux/signal.h> |
199f0ca5 | 76 | #include <linux/idr.h> |
0b4b3827 | 77 | #include <linux/kgdb.h> |
68bf21aa | 78 | #include <linux/ftrace.h> |
22a9d645 | 79 | #include <linux/async.h> |
2b2af54a | 80 | #include <linux/shmem_fs.h> |
5a0e3ad6 | 81 | #include <linux/slab.h> |
24a24bb6 | 82 | #include <linux/perf_event.h> |
a74fb73c | 83 | #include <linux/ptrace.h> |
aa8c6248 | 84 | #include <linux/pti.h> |
bb813f4c | 85 | #include <linux/blkdev.h> |
5d2a4e91 | 86 | #include <linux/sched/clock.h> |
29930025 | 87 | #include <linux/sched/task.h> |
68db0cf1 | 88 | #include <linux/sched/task_stack.h> |
65f382fd | 89 | #include <linux/context_tracking.h> |
47d06e53 | 90 | #include <linux/random.h> |
8f8cd6c0 | 91 | #include <linux/moduleloader.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> |
dfd402a4 | 99 | #include <linux/kcsan.h> |
eb9d7d39 | 100 | #include <linux/init_syscalls.h> |
e1fdc403 | 101 | #include <linux/stackdepot.h> |
375561bd | 102 | #include <linux/randomize_kstack.h> |
cb12fd8e | 103 | #include <linux/pidfs.h> |
a5e8131a | 104 | #include <linux/ptdump.h> |
9c1be193 | 105 | #include <net/net_namespace.h> |
1da177e4 LT |
106 | |
107 | #include <asm/io.h> | |
1da177e4 | 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 | 118 | |
2ce802f6 TH |
119 | /* |
120 | * Debug helper: via this flag we know that we are in 'early bootup code' | |
121 | * where only the boot processor is running with IRQ disabled. This means | |
122 | * two things - IRQ must not be enabled before the flag is cleared and some | |
123 | * operations which are not allowed with IRQ disabled are allowed while the | |
124 | * flag is set. | |
125 | */ | |
126 | bool early_boot_irqs_disabled __read_mostly; | |
127 | ||
a6826048 | 128 | enum system_states system_state __read_mostly; |
1da177e4 LT |
129 | EXPORT_SYMBOL(system_state); |
130 | ||
131 | /* | |
132 | * Boot command-line arguments | |
133 | */ | |
134 | #define MAX_INIT_ARGS CONFIG_INIT_ENV_ARG_LIMIT | |
135 | #define MAX_INIT_ENVS CONFIG_INIT_ENV_ARG_LIMIT | |
136 | ||
1da177e4 | 137 | /* Default late time init is NULL. archs can override this later. */ |
d2e3192b | 138 | void (*__initdata late_time_init)(void); |
1da177e4 | 139 | |
30d7e0d4 ABL |
140 | /* Untouched command line saved by arch-specific code. */ |
141 | char __initdata boot_command_line[COMMAND_LINE_SIZE]; | |
142 | /* Untouched saved command line (eg. for /proc) */ | |
941baf6f AD |
143 | char *saved_command_line __ro_after_init; |
144 | unsigned int saved_command_line_len __ro_after_init; | |
30d7e0d4 ABL |
145 | /* Command line for parameter parsing */ |
146 | static char *static_command_line; | |
51887d03 MH |
147 | /* Untouched extra command line */ |
148 | static char *extra_command_line; | |
13199162 MH |
149 | /* Extra init arguments */ |
150 | static char *extra_init_args; | |
1da177e4 | 151 | |
f61872bb SRV |
152 | #ifdef CONFIG_BOOT_CONFIG |
153 | /* Is bootconfig on command line? */ | |
caa0708a | 154 | static bool bootconfig_found; |
b66fbbe8 | 155 | static size_t initargs_offs; |
f61872bb SRV |
156 | #else |
157 | # define bootconfig_found false | |
b66fbbe8 | 158 | # define initargs_offs 0 |
f61872bb SRV |
159 | #endif |
160 | ||
1da177e4 | 161 | static char *execute_command; |
916db733 | 162 | static char *ramdisk_execute_command = "/init"; |
1da177e4 | 163 | |
c4b2c0c5 HFS |
164 | /* |
165 | * Used to generate warnings if static_key manipulation functions are used | |
166 | * before jump_label_init is called. | |
167 | */ | |
dd4d9fec | 168 | bool static_key_initialized __read_mostly; |
c4b2c0c5 HFS |
169 | EXPORT_SYMBOL_GPL(static_key_initialized); |
170 | ||
8b3b2955 JB |
171 | /* |
172 | * If set, this is an indication to the drivers that reset the underlying | |
173 | * device before going ahead with the initialization otherwise driver might | |
174 | * rely on the BIOS and skip the reset operation. | |
175 | * | |
176 | * This is useful if kernel is booting in an unreliable environment. | |
fc454fdc | 177 | * For ex. kdump situation where previous kernel has crashed, BIOS has been |
8b3b2955 JB |
178 | * skipped and devices will be in unknown state. |
179 | */ | |
180 | unsigned int reset_devices; | |
181 | EXPORT_SYMBOL(reset_devices); | |
1da177e4 | 182 | |
7e96287d VG |
183 | static int __init set_reset_devices(char *str) |
184 | { | |
185 | reset_devices = 1; | |
186 | return 1; | |
187 | } | |
188 | ||
189 | __setup("reset_devices", set_reset_devices); | |
190 | ||
dd4d9fec FF |
191 | static const char *argv_init[MAX_INIT_ARGS+2] = { "init", NULL, }; |
192 | const char *envp_init[MAX_INIT_ENVS+2] = { "HOME=/", "TERM=linux", NULL, }; | |
1da177e4 LT |
193 | static const char *panic_later, *panic_param; |
194 | ||
31c025b5 | 195 | static bool __init obsolete_checksetup(char *line) |
1da177e4 | 196 | { |
914dcaa8 | 197 | const struct obs_kernel_param *p; |
31c025b5 | 198 | bool had_early_param = false; |
1da177e4 LT |
199 | |
200 | p = __setup_start; | |
201 | do { | |
202 | int n = strlen(p->str); | |
b1e4d20c | 203 | if (parameqn(line, p->str, n)) { |
1da177e4 | 204 | if (p->early) { |
33df0d19 RR |
205 | /* Already done in parse_early_param? |
206 | * (Needs exact match on param part). | |
207 | * Keep iterating, as we can have early | |
208 | * params and __setups of same names 8( */ | |
1da177e4 | 209 | if (line[n] == '\0' || line[n] == '=') |
31c025b5 | 210 | had_early_param = true; |
1da177e4 | 211 | } else if (!p->setup_func) { |
ea676e84 AM |
212 | pr_warn("Parameter %s is obsolete, ignored\n", |
213 | p->str); | |
31c025b5 | 214 | return true; |
1da177e4 | 215 | } else if (p->setup_func(line + n)) |
31c025b5 | 216 | return true; |
1da177e4 LT |
217 | } |
218 | p++; | |
219 | } while (p < __setup_end); | |
33df0d19 RR |
220 | |
221 | return had_early_param; | |
1da177e4 LT |
222 | } |
223 | ||
224 | /* | |
225 | * This should be approx 2 Bo*oMips to start (note initial shift), and will | |
226 | * still work even if initially too large, it will just take slightly longer | |
227 | */ | |
228 | unsigned long loops_per_jiffy = (1<<12); | |
1da177e4 LT |
229 | EXPORT_SYMBOL(loops_per_jiffy); |
230 | ||
231 | static int __init debug_kernel(char *str) | |
232 | { | |
a8fe19eb | 233 | console_loglevel = CONSOLE_LOGLEVEL_DEBUG; |
f6f21c81 | 234 | return 0; |
1da177e4 LT |
235 | } |
236 | ||
237 | static int __init quiet_kernel(char *str) | |
238 | { | |
a8fe19eb | 239 | console_loglevel = CONSOLE_LOGLEVEL_QUIET; |
f6f21c81 | 240 | return 0; |
1da177e4 LT |
241 | } |
242 | ||
f6f21c81 YL |
243 | early_param("debug", debug_kernel); |
244 | early_param("quiet", quiet_kernel); | |
1da177e4 LT |
245 | |
246 | static int __init loglevel(char *str) | |
247 | { | |
808bf29b AS |
248 | int newlevel; |
249 | ||
250 | /* | |
251 | * Only update loglevel value when a correct setting was passed, | |
252 | * to prevent blind crashes (when loglevel being set to 0) that | |
253 | * are quite hard to debug | |
254 | */ | |
255 | if (get_option(&str, &newlevel)) { | |
256 | console_loglevel = newlevel; | |
257 | return 0; | |
258 | } | |
259 | ||
260 | return -EINVAL; | |
1da177e4 LT |
261 | } |
262 | ||
f6f21c81 | 263 | early_param("loglevel", loglevel); |
1da177e4 | 264 | |
de462e5f | 265 | #ifdef CONFIG_BLK_DEV_INITRD |
a2a9d67a | 266 | static void * __init get_boot_config_from_initrd(size_t *_size) |
de462e5f MH |
267 | { |
268 | u32 size, csum; | |
269 | char *data; | |
270 | u32 *hdr; | |
50b8a742 | 271 | int i; |
de462e5f MH |
272 | |
273 | if (!initrd_end) | |
274 | return NULL; | |
275 | ||
276 | data = (char *)initrd_end - BOOTCONFIG_MAGIC_LEN; | |
50b8a742 MH |
277 | /* |
278 | * Since Grub may align the size of initrd to 4, we must | |
279 | * check the preceding 3 bytes as well. | |
280 | */ | |
281 | for (i = 0; i < 4; i++) { | |
282 | if (!memcmp(data, BOOTCONFIG_MAGIC, BOOTCONFIG_MAGIC_LEN)) | |
283 | goto found; | |
284 | data--; | |
285 | } | |
286 | return NULL; | |
de462e5f | 287 | |
50b8a742 | 288 | found: |
de462e5f | 289 | hdr = (u32 *)(data - 8); |
24aed094 MH |
290 | size = le32_to_cpu(hdr[0]); |
291 | csum = le32_to_cpu(hdr[1]); | |
de462e5f MH |
292 | |
293 | data = ((void *)hdr) - size; | |
294 | if ((unsigned long)data < initrd_start) { | |
295 | pr_err("bootconfig size %d is greater than initrd size %ld\n", | |
296 | size, initrd_end - initrd_start); | |
297 | return NULL; | |
298 | } | |
299 | ||
765b8552 MH |
300 | if (xbc_calc_checksum(data, size) != csum) { |
301 | pr_err("bootconfig checksum failed\n"); | |
302 | return NULL; | |
303 | } | |
304 | ||
de462e5f MH |
305 | /* Remove bootconfig from initramfs/initrd */ |
306 | initrd_end = (unsigned long)data; | |
307 | if (_size) | |
308 | *_size = size; | |
de462e5f MH |
309 | |
310 | return data; | |
311 | } | |
312 | #else | |
a2a9d67a | 313 | static void * __init get_boot_config_from_initrd(size_t *_size) |
de462e5f MH |
314 | { |
315 | return NULL; | |
316 | } | |
317 | #endif | |
318 | ||
7684b858 | 319 | #ifdef CONFIG_BOOT_CONFIG |
51887d03 | 320 | |
a27026e9 | 321 | static char xbc_namebuf[XBC_KEYLEN_MAX] __initdata; |
51887d03 MH |
322 | |
323 | #define rest(dst, end) ((end) > (dst) ? (end) - (dst) : 0) | |
324 | ||
325 | static 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; | |
efee03a5 | 330 | const char *val, *q; |
51887d03 MH |
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); | |
88b91371 MH |
340 | if (!vnode) { |
341 | ret = snprintf(buf, rest(buf, end), "%s ", xbc_namebuf); | |
342 | if (ret < 0) | |
343 | return ret; | |
344 | buf += ret; | |
51887d03 | 345 | continue; |
88b91371 | 346 | } |
51887d03 | 347 | xbc_array_for_each_value(vnode, val) { |
efee03a5 RV |
348 | q = strpbrk(val, " \t\r\n") ? "\"" : ""; |
349 | ret = snprintf(buf, rest(buf, end), "%s=%s%s%s ", | |
350 | xbc_namebuf, q, val, q); | |
51887d03 MH |
351 | if (ret < 0) |
352 | return ret; | |
353 | buf += ret; | |
51887d03 | 354 | } |
51887d03 MH |
355 | } |
356 | ||
357 | return buf - (end - size); | |
358 | } | |
359 | #undef rest | |
360 | ||
361 | /* Make an extra command line under given key word */ | |
362 | static char * __init xbc_make_cmdline(const char *key) | |
363 | { | |
364 | struct xbc_node *root; | |
365 | char *new_cmdline; | |
366 | int ret, len = 0; | |
367 | ||
368 | root = xbc_find_node(key); | |
369 | if (!root) | |
370 | return NULL; | |
371 | ||
372 | /* Count required buffer size */ | |
373 | len = xbc_snprint_cmdline(NULL, 0, root); | |
374 | if (len <= 0) | |
375 | return NULL; | |
376 | ||
377 | new_cmdline = memblock_alloc(len + 1, SMP_CACHE_BYTES); | |
378 | if (!new_cmdline) { | |
379 | pr_err("Failed to allocate memory for extra kernel cmdline.\n"); | |
380 | return NULL; | |
381 | } | |
382 | ||
383 | ret = xbc_snprint_cmdline(new_cmdline, len + 1, root); | |
384 | if (ret < 0 || ret > len) { | |
385 | pr_err("Failed to print extra kernel cmdline.\n"); | |
4421cca0 | 386 | memblock_free(new_cmdline, len + 1); |
51887d03 MH |
387 | return NULL; |
388 | } | |
389 | ||
390 | return new_cmdline; | |
391 | } | |
392 | ||
f61872bb SRV |
393 | static int __init bootconfig_params(char *param, char *val, |
394 | const char *unused, void *arg) | |
395 | { | |
396 | if (strcmp(param, "bootconfig") == 0) { | |
397 | bootconfig_found = true; | |
f61872bb SRV |
398 | } |
399 | return 0; | |
400 | } | |
401 | ||
d0ac5fba MH |
402 | static int __init warn_bootconfig(char *str) |
403 | { | |
404 | /* The 'bootconfig' has been handled by bootconfig_params(). */ | |
405 | return 0; | |
406 | } | |
407 | ||
2b7d2fe7 | 408 | static void __init setup_boot_config(void) |
7684b858 | 409 | { |
f61872bb | 410 | static char tmp_cmdline[COMMAND_LINE_SIZE] __initdata; |
a2a9d67a MH |
411 | const char *msg, *data; |
412 | int pos, ret; | |
413 | size_t size; | |
414 | char *err; | |
7684b858 | 415 | |
611d0a95 | 416 | /* Cut out the bootconfig data even if we have no bootconfig option */ |
765b8552 | 417 | data = get_boot_config_from_initrd(&size); |
a2a9d67a MH |
418 | /* If there is no bootconfig in initrd, try embedded one. */ |
419 | if (!data) | |
420 | data = xbc_get_embedded_bootconfig(&size); | |
de462e5f | 421 | |
a1d3a6d9 | 422 | strscpy(tmp_cmdline, boot_command_line, COMMAND_LINE_SIZE); |
477d0847 MH |
423 | err = parse_args("bootconfig", tmp_cmdline, NULL, 0, 0, 0, NULL, |
424 | bootconfig_params); | |
f61872bb | 425 | |
caa0708a | 426 | if (IS_ERR(err) || !(bootconfig_found || IS_ENABLED(CONFIG_BOOT_CONFIG_FORCE))) |
7684b858 MH |
427 | return; |
428 | ||
b66fbbe8 | 429 | /* parse_args() stops at the next param of '--' and returns an address */ |
477d0847 | 430 | if (err) |
b66fbbe8 | 431 | initargs_offs = err - tmp_cmdline; |
477d0847 | 432 | |
611d0a95 | 433 | if (!data) { |
caa0708a MHG |
434 | /* If user intended to use bootconfig, show an error level message */ |
435 | if (bootconfig_found) | |
436 | pr_err("'bootconfig' found on command line, but no bootconfig found\n"); | |
437 | else | |
438 | pr_info("No bootconfig data provided, so skipping bootconfig"); | |
611d0a95 MH |
439 | return; |
440 | } | |
441 | ||
7495e092 | 442 | if (size >= XBC_DATA_MAX) { |
a2a9d67a MH |
443 | pr_err("bootconfig size %ld greater than max size %d\n", |
444 | (long)size, XBC_DATA_MAX); | |
7684b858 | 445 | return; |
7495e092 | 446 | } |
7684b858 | 447 | |
bdac5c2b | 448 | ret = xbc_init(data, size, &msg, &pos); |
89b74cac MH |
449 | if (ret < 0) { |
450 | if (pos < 0) | |
451 | pr_err("Failed to init bootconfig: %s.\n", msg); | |
452 | else | |
453 | pr_err("Failed to parse bootconfig: %s at %d.\n", | |
454 | msg, pos); | |
455 | } else { | |
e306220c | 456 | xbc_get_info(&ret, NULL); |
a2a9d67a | 457 | pr_info("Load bootconfig: %ld bytes %d nodes\n", (long)size, ret); |
51887d03 MH |
458 | /* keys starting with "kernel." are passed via cmdline */ |
459 | extra_command_line = xbc_make_cmdline("kernel"); | |
13199162 MH |
460 | /* Also, "init." keys are init arguments */ |
461 | extra_init_args = xbc_make_cmdline("init"); | |
51887d03 | 462 | } |
7495e092 | 463 | return; |
7684b858 | 464 | } |
de462e5f | 465 | |
40caa127 MH |
466 | static void __init exit_boot_config(void) |
467 | { | |
115d4d08 | 468 | xbc_exit(); |
40caa127 MH |
469 | } |
470 | ||
471 | #else /* !CONFIG_BOOT_CONFIG */ | |
de462e5f | 472 | |
2b7d2fe7 | 473 | static void __init setup_boot_config(void) |
de462e5f MH |
474 | { |
475 | /* Remove bootconfig data from initrd */ | |
765b8552 | 476 | get_boot_config_from_initrd(NULL); |
de462e5f | 477 | } |
d8a953dd MH |
478 | |
479 | static int __init warn_bootconfig(char *str) | |
480 | { | |
36c6aa26 | 481 | pr_warn("WARNING: 'bootconfig' found on the kernel command line but CONFIG_BOOT_CONFIG is not set.\n"); |
d8a953dd MH |
482 | return 0; |
483 | } | |
40caa127 MH |
484 | |
485 | #define exit_boot_config() do {} while (0) | |
486 | ||
487 | #endif /* CONFIG_BOOT_CONFIG */ | |
488 | ||
d0ac5fba | 489 | early_param("bootconfig", warn_bootconfig); |
7684b858 | 490 | |
c722cea2 MH |
491 | bool __init cmdline_has_extra_options(void) |
492 | { | |
493 | return extra_command_line || extra_init_args; | |
494 | } | |
495 | ||
a99cd112 | 496 | /* Change NUL term back to "=", to make "param" the whole string. */ |
7e2762e1 | 497 | static void __init repair_env_string(char *param, char *val) |
1da177e4 | 498 | { |
1da177e4 LT |
499 | if (val) { |
500 | /* param=val or param="val"? */ | |
501 | if (val == param+strlen(param)+1) | |
502 | val[-1] = '='; | |
503 | else if (val == param+strlen(param)+2) { | |
504 | val[-2] = '='; | |
505 | memmove(val-1, val, strlen(val)+1); | |
1da177e4 LT |
506 | } else |
507 | BUG(); | |
508 | } | |
a99cd112 CM |
509 | } |
510 | ||
51e158c1 | 511 | /* Anything after -- gets handed straight to init. */ |
ecc86170 LR |
512 | static int __init set_init_arg(char *param, char *val, |
513 | const char *unused, void *arg) | |
51e158c1 RR |
514 | { |
515 | unsigned int i; | |
516 | ||
517 | if (panic_later) | |
518 | return 0; | |
519 | ||
7e2762e1 | 520 | repair_env_string(param, val); |
51e158c1 RR |
521 | |
522 | for (i = 0; argv_init[i]; i++) { | |
523 | if (i == MAX_INIT_ARGS) { | |
524 | panic_later = "init"; | |
525 | panic_param = param; | |
526 | return 0; | |
527 | } | |
528 | } | |
529 | argv_init[i] = param; | |
530 | return 0; | |
531 | } | |
532 | ||
a99cd112 CM |
533 | /* |
534 | * Unknown boot options get handed to init, unless they look like | |
535 | * unused parameters (modprobe will find them in /proc/cmdline). | |
536 | */ | |
ecc86170 LR |
537 | static int __init unknown_bootoption(char *param, char *val, |
538 | const char *unused, void *arg) | |
a99cd112 | 539 | { |
283900e8 AS |
540 | size_t len = strlen(param); |
541 | ||
8001f493 KJ |
542 | /* Handle params aliased to sysctls */ |
543 | if (sysctl_is_alias(param)) | |
544 | return 0; | |
545 | ||
7e2762e1 | 546 | repair_env_string(param, val); |
1da177e4 LT |
547 | |
548 | /* Handle obsolete-style parameters */ | |
549 | if (obsolete_checksetup(param)) | |
550 | return 0; | |
551 | ||
f066a4f6 | 552 | /* Unused module parameter. */ |
283900e8 | 553 | if (strnchr(param, len, '.')) |
1da177e4 | 554 | return 0; |
1da177e4 LT |
555 | |
556 | if (panic_later) | |
557 | return 0; | |
558 | ||
559 | if (val) { | |
560 | /* Environment option */ | |
561 | unsigned int i; | |
562 | for (i = 0; envp_init[i]; i++) { | |
563 | if (i == MAX_INIT_ENVS) { | |
499a4584 | 564 | panic_later = "env"; |
1da177e4 LT |
565 | panic_param = param; |
566 | } | |
283900e8 | 567 | if (!strncmp(param, envp_init[i], len+1)) |
1da177e4 LT |
568 | break; |
569 | } | |
570 | envp_init[i] = param; | |
571 | } else { | |
572 | /* Command line option */ | |
573 | unsigned int i; | |
574 | for (i = 0; argv_init[i]; i++) { | |
575 | if (i == MAX_INIT_ARGS) { | |
499a4584 | 576 | panic_later = "init"; |
1da177e4 LT |
577 | panic_param = param; |
578 | } | |
579 | } | |
580 | argv_init[i] = param; | |
581 | } | |
582 | return 0; | |
583 | } | |
584 | ||
585 | static int __init init_setup(char *str) | |
586 | { | |
587 | unsigned int i; | |
588 | ||
589 | execute_command = str; | |
590 | /* | |
591 | * In case LILO is going to boot us with default command line, | |
592 | * it prepends "auto" before the whole cmdline which makes | |
593 | * the shell think it should execute a script with such name. | |
594 | * So we ignore all arguments entered _before_ init=... [MJ] | |
595 | */ | |
596 | for (i = 1; i < MAX_INIT_ARGS; i++) | |
597 | argv_init[i] = NULL; | |
598 | return 1; | |
599 | } | |
600 | __setup("init=", init_setup); | |
601 | ||
ffdfc409 OJ |
602 | static int __init rdinit_setup(char *str) |
603 | { | |
604 | unsigned int i; | |
605 | ||
606 | ramdisk_execute_command = str; | |
607 | /* See "auto" comment in init_setup */ | |
608 | for (i = 1; i < MAX_INIT_ARGS; i++) | |
609 | argv_init[i] = NULL; | |
610 | return 1; | |
611 | } | |
612 | __setup("rdinit=", rdinit_setup); | |
613 | ||
1da177e4 | 614 | #ifndef CONFIG_SMP |
e0982e90 | 615 | static inline void setup_nr_cpu_ids(void) { } |
1da177e4 | 616 | static inline void smp_prepare_cpus(unsigned int maxcpus) { } |
1da177e4 LT |
617 | #endif |
618 | ||
30d7e0d4 ABL |
619 | /* |
620 | * We need to store the untouched command line for future reference. | |
621 | * We also need to store the touched command line since the parameter | |
622 | * parsing is performed in place, and we should allow a component to | |
623 | * store reference of name/value for future reference. | |
624 | */ | |
625 | static void __init setup_command_line(char *command_line) | |
626 | { | |
13199162 | 627 | size_t len, xlen = 0, ilen = 0; |
f5c7310a | 628 | |
51887d03 MH |
629 | if (extra_command_line) |
630 | xlen = strlen(extra_command_line); | |
cd24bdb0 YW |
631 | if (extra_init_args) { |
632 | extra_init_args = strim(extra_init_args); /* remove trailing space */ | |
13199162 | 633 | ilen = strlen(extra_init_args) + 4; /* for " -- " */ |
cd24bdb0 | 634 | } |
f5c7310a | 635 | |
ddd53363 | 636 | len = xlen + strlen(boot_command_line) + ilen + 1; |
f5c7310a | 637 | |
ddd53363 | 638 | saved_command_line = memblock_alloc(len, SMP_CACHE_BYTES); |
f5c7310a | 639 | if (!saved_command_line) |
ddd53363 | 640 | panic("%s: Failed to allocate %zu bytes\n", __func__, len); |
f5c7310a | 641 | |
46dad3c1 YW |
642 | len = xlen + strlen(command_line) + 1; |
643 | ||
f5c7310a MR |
644 | static_command_line = memblock_alloc(len, SMP_CACHE_BYTES); |
645 | if (!static_command_line) | |
646 | panic("%s: Failed to allocate %zu bytes\n", __func__, len); | |
647 | ||
51887d03 MH |
648 | if (xlen) { |
649 | /* | |
650 | * We have to put extra_command_line before boot command | |
651 | * lines because there could be dashes (separator of init | |
652 | * command line) in the command lines. | |
653 | */ | |
654 | strcpy(saved_command_line, extra_command_line); | |
655 | strcpy(static_command_line, extra_command_line); | |
656 | } | |
657 | strcpy(saved_command_line + xlen, boot_command_line); | |
658 | strcpy(static_command_line + xlen, command_line); | |
13199162 MH |
659 | |
660 | if (ilen) { | |
661 | /* | |
662 | * Append supplemental init boot args to saved_command_line | |
663 | * so that user can check what command line options passed | |
664 | * to init. | |
b66fbbe8 MH |
665 | * The order should always be |
666 | * " -- "[bootconfig init-param][cmdline init-param] | |
13199162 | 667 | */ |
b66fbbe8 MH |
668 | if (initargs_offs) { |
669 | len = xlen + initargs_offs; | |
670 | strcpy(saved_command_line + len, extra_init_args); | |
671 | len += ilen - 4; /* strlen(extra_init_args) */ | |
672 | strcpy(saved_command_line + len, | |
673 | boot_command_line + initargs_offs - 1); | |
f61872bb | 674 | } else { |
b66fbbe8 | 675 | len = strlen(saved_command_line); |
13199162 MH |
676 | strcpy(saved_command_line + len, " -- "); |
677 | len += 4; | |
b66fbbe8 | 678 | strcpy(saved_command_line + len, extra_init_args); |
f61872bb | 679 | } |
13199162 | 680 | } |
941baf6f AD |
681 | |
682 | saved_command_line_len = strlen(saved_command_line); | |
30d7e0d4 ABL |
683 | } |
684 | ||
1da177e4 LT |
685 | /* |
686 | * We need to finalize in a non-__init function or else race conditions | |
687 | * between the root thread and the init thread may cause start_kernel to | |
688 | * be reaped by free_initmem before the root thread has proceeded to | |
689 | * cpu_idle. | |
690 | * | |
691 | * gcc-3.4 accidentally inlines this function, so use noinline. | |
692 | */ | |
693 | ||
b433c3d4 PZ |
694 | static __initdata DECLARE_COMPLETION(kthreadd_done); |
695 | ||
ac4db926 | 696 | static noinline void __ref __noreturn rest_init(void) |
1da177e4 | 697 | { |
8fb12156 | 698 | struct task_struct *tsk; |
73c27992 EB |
699 | int pid; |
700 | ||
7db905e6 | 701 | rcu_scheduler_starting(); |
b433c3d4 | 702 | /* |
97158569 | 703 | * We need to spawn init first so that it obtains pid 1, however |
b433c3d4 PZ |
704 | * the init task will end up wanting to create kthreads, which, if |
705 | * we schedule it before we create kthreadd, will OOPS. | |
706 | */ | |
343f4c49 | 707 | pid = user_mode_thread(kernel_init, NULL, CLONE_FS); |
8fb12156 TG |
708 | /* |
709 | * Pin init on the boot CPU. Task migration is not properly working | |
710 | * until sched_init_smp() has been run. It will set the allowed | |
711 | * CPUs for init to the non isolated CPUs. | |
712 | */ | |
713 | rcu_read_lock(); | |
714 | tsk = find_task_by_pid_ns(pid, &init_pid_ns); | |
15faafc6 | 715 | tsk->flags |= PF_NO_SETAFFINITY; |
8fb12156 TG |
716 | set_cpus_allowed_ptr(tsk, cpumask_of(smp_processor_id())); |
717 | rcu_read_unlock(); | |
718 | ||
1da177e4 | 719 | numa_default_policy(); |
cf587db2 | 720 | pid = kernel_thread(kthreadd, NULL, NULL, CLONE_FS | CLONE_FILES); |
d11c563d | 721 | rcu_read_lock(); |
5cd20455 | 722 | kthreadd_task = find_task_by_pid_ns(pid, &init_pid_ns); |
d11c563d | 723 | rcu_read_unlock(); |
1c3c5eab TG |
724 | |
725 | /* | |
726 | * Enable might_sleep() and smp_processor_id() checks. | |
c1a280b6 | 727 | * They cannot be enabled earlier because with CONFIG_PREEMPTION=y |
1c3c5eab TG |
728 | * kernel_thread() would trigger might_sleep() splats. With |
729 | * CONFIG_PREEMPT_VOLUNTARY=y the init task might have scheduled | |
730 | * already, but it's stuck on the kthreadd_done completion. | |
731 | */ | |
732 | system_state = SYSTEM_SCHEDULING; | |
733 | ||
b433c3d4 | 734 | complete(&kthreadd_done); |
f340c0d1 IM |
735 | |
736 | /* | |
737 | * The boot idle thread must execute schedule() | |
1df21055 | 738 | * at least once to get things moving: |
f340c0d1 | 739 | */ |
bd2f5536 | 740 | schedule_preempt_disabled(); |
5bfb5d69 | 741 | /* Call into cpu_idle with preempt disabled */ |
a1a04ec3 | 742 | cpu_startup_entry(CPUHP_ONLINE); |
1df21055 | 743 | } |
1da177e4 LT |
744 | |
745 | /* Check for early params. */ | |
ecc86170 LR |
746 | static int __init do_early_param(char *param, char *val, |
747 | const char *unused, void *arg) | |
1da177e4 | 748 | { |
914dcaa8 | 749 | const struct obs_kernel_param *p; |
1da177e4 LT |
750 | |
751 | for (p = __setup_start; p < __setup_end; p++) { | |
b1e4d20c | 752 | if ((p->early && parameq(param, p->str)) || |
18a8bd94 YL |
753 | (strcmp(param, "console") == 0 && |
754 | strcmp(p->str, "earlycon") == 0) | |
755 | ) { | |
1da177e4 | 756 | if (p->setup_func(val) != 0) |
ea676e84 | 757 | pr_warn("Malformed early option '%s'\n", param); |
1da177e4 LT |
758 | } |
759 | } | |
760 | /* We accept everything at this stage. */ | |
761 | return 0; | |
762 | } | |
763 | ||
13977091 MD |
764 | void __init parse_early_options(char *cmdline) |
765 | { | |
ecc86170 LR |
766 | parse_args("early options", cmdline, NULL, 0, 0, 0, NULL, |
767 | do_early_param); | |
13977091 MD |
768 | } |
769 | ||
1da177e4 LT |
770 | /* Arch code calls this early on, or if not, just before other parsing. */ |
771 | void __init parse_early_param(void) | |
772 | { | |
dd4d9fec FF |
773 | static int done __initdata; |
774 | static char tmp_cmdline[COMMAND_LINE_SIZE] __initdata; | |
1da177e4 LT |
775 | |
776 | if (done) | |
777 | return; | |
778 | ||
779 | /* All fall through to do_early_param. */ | |
a1d3a6d9 | 780 | strscpy(tmp_cmdline, boot_command_line, COMMAND_LINE_SIZE); |
13977091 | 781 | parse_early_options(tmp_cmdline); |
1da177e4 LT |
782 | done = 1; |
783 | } | |
784 | ||
e7ff3a47 TG |
785 | void __init __weak arch_post_acpi_subsys_init(void) { } |
786 | ||
839ad62e | 787 | void __init __weak smp_setup_processor_id(void) |
033ab7f8 AM |
788 | { |
789 | } | |
790 | ||
71261072 TG |
791 | void __init __weak smp_prepare_boot_cpu(void) |
792 | { | |
793 | } | |
794 | ||
eded09cc | 795 | # if THREAD_SIZE >= PAGE_SIZE |
b235beea | 796 | void __init __weak thread_stack_cache_init(void) |
8c9843e5 BH |
797 | { |
798 | } | |
eded09cc | 799 | #endif |
8c9843e5 | 800 | |
4fc19708 NA |
801 | void __init __weak poking_init(void) { } |
802 | ||
782de70c | 803 | void __init __weak pgtable_cache_init(void) { } |
caa84136 | 804 | |
8b097881 KW |
805 | void __init __weak trap_init(void) { } |
806 | ||
4e37958d SRV |
807 | bool initcall_debug; |
808 | core_param(initcall_debug, initcall_debug, bool, 0644); | |
b0dc52f1 SRV |
809 | |
810 | #ifdef TRACEPOINTS_ENABLED | |
4e37958d | 811 | static void __init initcall_debug_enable(void); |
b0dc52f1 SRV |
812 | #else |
813 | static inline void initcall_debug_enable(void) | |
814 | { | |
815 | } | |
816 | #endif | |
4e37958d | 817 | |
8cb37a59 | 818 | #ifdef CONFIG_RANDOMIZE_KSTACK_OFFSET |
39218ff4 KC |
819 | DEFINE_STATIC_KEY_MAYBE_RO(CONFIG_RANDOMIZE_KSTACK_OFFSET_DEFAULT, |
820 | randomize_kstack_offset); | |
821 | DEFINE_PER_CPU(u32, kstack_offset); | |
822 | ||
823 | static int __init early_randomize_kstack_offset(char *buf) | |
824 | { | |
825 | int ret; | |
826 | bool bool_result; | |
827 | ||
828 | ret = kstrtobool(buf, &bool_result); | |
829 | if (ret) | |
830 | return ret; | |
831 | ||
832 | if (bool_result) | |
833 | static_branch_enable(&randomize_kstack_offset); | |
834 | else | |
835 | static_branch_disable(&randomize_kstack_offset); | |
836 | return 0; | |
837 | } | |
838 | early_param("randomize_kstack_offset", early_randomize_kstack_offset); | |
839 | #endif | |
840 | ||
86d1919a AH |
841 | static void __init print_unknown_bootoptions(void) |
842 | { | |
843 | char *unknown_options; | |
844 | char *end; | |
845 | const char *const *p; | |
846 | size_t len; | |
847 | ||
848 | if (panic_later || (!argv_init[1] && !envp_init[2])) | |
849 | return; | |
850 | ||
851 | /* | |
852 | * Determine how many options we have to print out, plus a space | |
853 | * before each | |
854 | */ | |
855 | len = 1; /* null terminator */ | |
856 | for (p = &argv_init[1]; *p; p++) { | |
857 | len++; | |
858 | len += strlen(*p); | |
859 | } | |
860 | for (p = &envp_init[2]; *p; p++) { | |
861 | len++; | |
862 | len += strlen(*p); | |
863 | } | |
864 | ||
865 | unknown_options = memblock_alloc(len, SMP_CACHE_BYTES); | |
866 | if (!unknown_options) { | |
867 | pr_err("%s: Failed to allocate %zu bytes\n", | |
868 | __func__, len); | |
869 | return; | |
870 | } | |
871 | end = unknown_options; | |
872 | ||
873 | for (p = &argv_init[1]; *p; p++) | |
874 | end += sprintf(end, " %s", *p); | |
875 | for (p = &envp_init[2]; *p; p++) | |
876 | end += sprintf(end, " %s", *p); | |
877 | ||
8bc2b3dc AH |
878 | /* Start at unknown_options[1] to skip the initial space */ |
879 | pr_notice("Unknown kernel command line parameters \"%s\", will be passed to user space.\n", | |
880 | &unknown_options[1]); | |
4421cca0 | 881 | memblock_free(unknown_options, len); |
86d1919a AH |
882 | } |
883 | ||
514ca14e | 884 | asmlinkage __visible __init __no_sanitize_address __noreturn __no_stack_protector |
885 | void start_kernel(void) | |
1da177e4 | 886 | { |
dd4d9fec FF |
887 | char *command_line; |
888 | char *after_dashes; | |
033ab7f8 | 889 | |
d4311ff1 | 890 | set_task_stack_end_magic(&init_task); |
73839c5b | 891 | smp_setup_processor_id(); |
3ac7fe5a | 892 | debug_objects_early_init(); |
83cc6fa0 | 893 | init_vmlinux_build_id(); |
42059429 | 894 | |
ddbcc7e8 | 895 | cgroup_init_early(); |
fbb9ce95 IM |
896 | |
897 | local_irq_disable(); | |
2ce802f6 | 898 | early_boot_irqs_disabled = true; |
fbb9ce95 | 899 | |
1b3b3b49 VK |
900 | /* |
901 | * Interrupts are still disabled. Do necessary setups, then | |
902 | * enable them. | |
903 | */ | |
44fd2299 | 904 | boot_cpu_init(); |
1da177e4 | 905 | page_address_init(); |
ea676e84 | 906 | pr_notice("%s", linux_banner); |
e6b1db98 | 907 | early_security_init(); |
1da177e4 | 908 | setup_arch(&command_line); |
2b7d2fe7 | 909 | setup_boot_config(); |
30d7e0d4 | 910 | setup_command_line(command_line); |
e0982e90 | 911 | setup_nr_cpu_ids(); |
d6647bdf | 912 | setup_per_cpu_areas(); |
44fd2299 | 913 | smp_prepare_boot_cpu(); /* arch-specific boot-cpu hooks */ |
b5b1404d | 914 | boot_cpu_hotplug_init(); |
1da177e4 | 915 | |
51887d03 | 916 | pr_notice("Kernel command line: %s\n", saved_command_line); |
6041186a DW |
917 | /* parameters may set static keys */ |
918 | jump_label_init(); | |
83b519e8 | 919 | parse_early_param(); |
51e158c1 RR |
920 | after_dashes = parse_args("Booting kernel", |
921 | static_command_line, __start___param, | |
922 | __stop___param - __start___param, | |
ecc86170 | 923 | -1, -1, NULL, &unknown_bootoption); |
86d1919a | 924 | print_unknown_bootoptions(); |
3438cf54 | 925 | if (!IS_ERR_OR_NULL(after_dashes)) |
51e158c1 | 926 | parse_args("Setting init args", after_dashes, NULL, 0, -1, -1, |
ecc86170 | 927 | NULL, set_init_arg); |
13199162 MH |
928 | if (extra_init_args) |
929 | parse_args("Setting extra init args", extra_init_args, | |
930 | NULL, 0, -1, -1, NULL, set_init_arg); | |
97ce2c88 | 931 | |
f6238499 JD |
932 | /* Architectural and non-timekeeping rng init, before allocator init */ |
933 | random_init_early(command_line); | |
934 | ||
83b519e8 PE |
935 | /* |
936 | * These use large bootmem allocations and must precede | |
b7ec1bf3 | 937 | * initalization of page allocator |
83b519e8 | 938 | */ |
162a7e75 | 939 | setup_log_buf(0); |
83b519e8 PE |
940 | vfs_caches_init_early(); |
941 | sort_main_extable(); | |
942 | trap_init(); | |
b7ec1bf3 | 943 | mm_core_init(); |
5b93a836 | 944 | poking_init(); |
f631718d SRV |
945 | ftrace_init(); |
946 | ||
e725c731 SRV |
947 | /* trace_printk can be enabled here */ |
948 | early_trace_init(); | |
949 | ||
1da177e4 LT |
950 | /* |
951 | * Set up the scheduler prior starting any interrupts (such as the | |
952 | * timer interrupt). Full topology setup happens at smp_init() | |
953 | * time - but meanwhile we still have a functioning scheduler. | |
954 | */ | |
955 | sched_init(); | |
f1a0a376 | 956 | |
dd4d9fec FF |
957 | if (WARN(!irqs_disabled(), |
958 | "Interrupts were enabled *very* early, fixing it\n")) | |
c4a68306 | 959 | local_irq_disable(); |
0a835c4f | 960 | radix_tree_init(); |
54a611b6 | 961 | maple_tree_init(); |
3347fa09 | 962 | |
7d229c66 TS |
963 | /* |
964 | * Set up housekeeping before setting up workqueues to allow the unbound | |
965 | * workqueue to take non-housekeeping into account. | |
966 | */ | |
967 | housekeeping_init(); | |
968 | ||
3347fa09 TH |
969 | /* |
970 | * Allow workqueue creation and work item queueing/cancelling | |
971 | * early. Work item execution depends on kthreads and starts after | |
972 | * workqueue_init(). | |
973 | */ | |
974 | workqueue_init_early(); | |
975 | ||
1da177e4 | 976 | rcu_init(); |
5f893b26 | 977 | |
e725c731 | 978 | /* Trace events are available after this */ |
5f893b26 SRRH |
979 | trace_init(); |
980 | ||
4e37958d SRV |
981 | if (initcall_debug) |
982 | initcall_debug_enable(); | |
983 | ||
65f382fd | 984 | context_tracking_init(); |
0b8f1efa YL |
985 | /* init some links before init_ISA_irqs() */ |
986 | early_irq_init(); | |
1da177e4 | 987 | init_IRQ(); |
ad2b1353 | 988 | tick_init(); |
d6dd50e0 | 989 | rcu_init_nohz(); |
1da177e4 | 990 | init_timers(); |
8e9c01c7 | 991 | srcu_init(); |
c0a31329 | 992 | hrtimers_init(); |
1da177e4 | 993 | softirq_init(); |
ad596171 | 994 | timekeeping_init(); |
fe222a6c | 995 | time_init(); |
d5553523 | 996 | |
f6238499 JD |
997 | /* This must be after timekeeping is initialized */ |
998 | random_init(); | |
999 | ||
1000 | /* These make use of the fully initialized rng */ | |
1001 | kfence_init(); | |
d5553523 KC |
1002 | boot_init_stack_canary(); |
1003 | ||
9e630205 | 1004 | perf_event_init(); |
93e02814 | 1005 | profile_init(); |
d8ad7d11 | 1006 | call_function_init(); |
f91eb62f | 1007 | WARN(!irqs_disabled(), "Interrupts were enabled early\n"); |
c3bc8fd6 | 1008 | |
2ce802f6 | 1009 | early_boot_irqs_disabled = false; |
93e02814 | 1010 | local_irq_enable(); |
dcce284a | 1011 | |
7e85ee0c | 1012 | kmem_cache_init_late(); |
1da177e4 LT |
1013 | |
1014 | /* | |
1015 | * HACK ALERT! This is early. We're enabling the console before | |
1016 | * we've done PCI setups etc, and console_init() must be aware of | |
1017 | * this. But we do want output early, in case something goes wrong. | |
1018 | */ | |
1019 | console_init(); | |
1020 | if (panic_later) | |
499a4584 TH |
1021 | panic("Too many boot %s vars at `%s'", panic_later, |
1022 | panic_param); | |
fbb9ce95 | 1023 | |
c3bc8fd6 | 1024 | lockdep_init(); |
fbb9ce95 | 1025 | |
9a11b49a IM |
1026 | /* |
1027 | * Need to run this when irqs are enabled, because it wants | |
1028 | * to self-test [hard/soft]-irqs on/off lock inversion bugs | |
1029 | * too: | |
1030 | */ | |
1031 | locking_selftest(); | |
1032 | ||
1da177e4 LT |
1033 | #ifdef CONFIG_BLK_DEV_INITRD |
1034 | if (initrd_start && !initrd_below_start_ok && | |
bd673c7c | 1035 | page_to_pfn(virt_to_page((void *)initrd_start)) < min_low_pfn) { |
ea676e84 | 1036 | pr_crit("initrd overwritten (0x%08lx < 0x%08lx) - disabling it.\n", |
bd673c7c GU |
1037 | page_to_pfn(virt_to_page((void *)initrd_start)), |
1038 | min_low_pfn); | |
1da177e4 LT |
1039 | initrd_start = 0; |
1040 | } | |
1041 | #endif | |
e7c8d5c9 | 1042 | setup_per_cpu_pageset(); |
1da177e4 | 1043 | numa_policy_init(); |
9c71206d | 1044 | acpi_early_init(); |
1da177e4 LT |
1045 | if (late_time_init) |
1046 | late_time_init(); | |
857baa87 | 1047 | sched_clock_init(); |
1da177e4 | 1048 | calibrate_delay(); |
e45e761b | 1049 | |
9df9d2f0 TG |
1050 | arch_cpu_finalize_init(); |
1051 | ||
95846ecf | 1052 | pid_idr_init(); |
1da177e4 | 1053 | anon_vma_init(); |
11520e5e | 1054 | #ifdef CONFIG_X86 |
83e68189 | 1055 | if (efi_enabled(EFI_RUNTIME_SERVICES)) |
11520e5e LT |
1056 | efi_enter_virtual_mode(); |
1057 | #endif | |
b235beea | 1058 | thread_stack_cache_init(); |
d84f4f99 | 1059 | cred_init(); |
ff691f6e | 1060 | fork_init(); |
1da177e4 | 1061 | proc_caches_init(); |
3ea056c5 | 1062 | uts_ns_init(); |
1da177e4 LT |
1063 | key_init(); |
1064 | security_init(); | |
0b4b3827 | 1065 | dbg_late_init(); |
9c1be193 | 1066 | net_ns_init(); |
4248b0da | 1067 | vfs_caches_init(); |
62906027 | 1068 | pagecache_init(); |
1da177e4 | 1069 | signals_init(); |
09652320 | 1070 | seq_file_init(); |
1da177e4 | 1071 | proc_root_init(); |
e149ed2b | 1072 | nsfs_init(); |
cb12fd8e | 1073 | pidfs_init(); |
1da177e4 | 1074 | cpuset_init(); |
695df213 | 1075 | cgroup_init(); |
c757249a | 1076 | taskstats_init_early(); |
ca74e92b | 1077 | delayacct_init(); |
1da177e4 | 1078 | |
b064a8fa | 1079 | acpi_subsystem_init(); |
e7ff3a47 | 1080 | arch_post_acpi_subsys_init(); |
dfd402a4 | 1081 | kcsan_init(); |
1da177e4 LT |
1082 | |
1083 | /* Do the rest non-__init'ed, we're now alive */ | |
ac4db926 | 1084 | rest_init(); |
a9a3ed1e | 1085 | |
dc1d0553 | 1086 | /* |
1087 | * Avoid stack canaries in callers of boot_init_stack_canary for gcc-10 | |
1088 | * and older. | |
1089 | */ | |
1090 | #if !__has_attribute(__no_stack_protector__) | |
a9a3ed1e | 1091 | prevent_tail_call_optimization(); |
dc1d0553 | 1092 | #endif |
1da177e4 LT |
1093 | } |
1094 | ||
b99b87f7 PO |
1095 | /* Call all constructor functions linked into the kernel. */ |
1096 | static void __init do_ctors(void) | |
1097 | { | |
55b6f763 JB |
1098 | /* |
1099 | * For UML, the constructors have already been called by the | |
1100 | * normal setup code as it's just a normal ELF binary, so we | |
1101 | * cannot do it again - but we do need CONFIG_CONSTRUCTORS | |
1102 | * even on UML for modules. | |
1103 | */ | |
1104 | #if defined(CONFIG_CONSTRUCTORS) && !defined(CONFIG_UML) | |
196a15b4 | 1105 | ctor_fn_t *fn = (ctor_fn_t *) __ctors_start; |
b99b87f7 | 1106 | |
196a15b4 HS |
1107 | for (; fn < (ctor_fn_t *) __ctors_end; fn++) |
1108 | (*fn)(); | |
b99b87f7 PO |
1109 | #endif |
1110 | } | |
1111 | ||
7b0b73d7 PB |
1112 | #ifdef CONFIG_KALLSYMS |
1113 | struct blacklist_entry { | |
1114 | struct list_head next; | |
1115 | char *buf; | |
1116 | }; | |
1117 | ||
1118 | static __initdata_or_module LIST_HEAD(blacklisted_initcalls); | |
1119 | ||
1120 | static int __init initcall_blacklist(char *str) | |
1121 | { | |
1122 | char *str_entry; | |
1123 | struct blacklist_entry *entry; | |
1124 | ||
1125 | /* str argument is a comma-separated list of functions */ | |
1126 | do { | |
1127 | str_entry = strsep(&str, ","); | |
1128 | if (str_entry) { | |
1129 | pr_debug("blacklisting initcall %s\n", str_entry); | |
7e1c4e27 MR |
1130 | entry = memblock_alloc(sizeof(*entry), |
1131 | SMP_CACHE_BYTES); | |
f5c7310a MR |
1132 | if (!entry) |
1133 | panic("%s: Failed to allocate %zu bytes\n", | |
1134 | __func__, sizeof(*entry)); | |
7e1c4e27 MR |
1135 | entry->buf = memblock_alloc(strlen(str_entry) + 1, |
1136 | SMP_CACHE_BYTES); | |
f5c7310a MR |
1137 | if (!entry->buf) |
1138 | panic("%s: Failed to allocate %zu bytes\n", | |
1139 | __func__, strlen(str_entry) + 1); | |
7b0b73d7 PB |
1140 | strcpy(entry->buf, str_entry); |
1141 | list_add(&entry->next, &blacklisted_initcalls); | |
1142 | } | |
1143 | } while (str_entry); | |
1144 | ||
f9a40b08 | 1145 | return 1; |
7b0b73d7 PB |
1146 | } |
1147 | ||
1148 | static bool __init_or_module initcall_blacklisted(initcall_t fn) | |
1149 | { | |
7b0b73d7 | 1150 | struct blacklist_entry *entry; |
c8cdd2be | 1151 | char fn_name[KSYM_SYMBOL_LEN]; |
0fd5ed8d | 1152 | unsigned long addr; |
7b0b73d7 | 1153 | |
c8cdd2be | 1154 | if (list_empty(&blacklisted_initcalls)) |
7b0b73d7 PB |
1155 | return false; |
1156 | ||
0fd5ed8d RV |
1157 | addr = (unsigned long) dereference_function_descriptor(fn); |
1158 | sprint_symbol_no_offset(fn_name, addr); | |
c8cdd2be | 1159 | |
841c06d7 PB |
1160 | /* |
1161 | * fn will be "function_name [module_name]" where [module_name] is not | |
1162 | * displayed for built-in init functions. Strip off the [module_name]. | |
1163 | */ | |
1164 | strreplace(fn_name, ' ', '\0'); | |
1165 | ||
e6fd1fb3 | 1166 | list_for_each_entry(entry, &blacklisted_initcalls, next) { |
7b0b73d7 PB |
1167 | if (!strcmp(fn_name, entry->buf)) { |
1168 | pr_debug("initcall %s blacklisted\n", fn_name); | |
7b0b73d7 PB |
1169 | return true; |
1170 | } | |
1171 | } | |
1172 | ||
7b0b73d7 PB |
1173 | return false; |
1174 | } | |
1175 | #else | |
1176 | static int __init initcall_blacklist(char *str) | |
1177 | { | |
1178 | pr_warn("initcall_blacklist requires CONFIG_KALLSYMS\n"); | |
1179 | return 0; | |
1180 | } | |
1181 | ||
1182 | static bool __init_or_module initcall_blacklisted(initcall_t fn) | |
1183 | { | |
1184 | return false; | |
1185 | } | |
1186 | #endif | |
1187 | __setup("initcall_blacklist=", initcall_blacklist); | |
1188 | ||
4e37958d SRV |
1189 | static __init_or_module void |
1190 | trace_initcall_start_cb(void *data, initcall_t fn) | |
1da177e4 | 1191 | { |
374d6cda | 1192 | ktime_t *calltime = data; |
1da177e4 | 1193 | |
58e2cf5d | 1194 | printk(KERN_DEBUG "calling %pS @ %i\n", fn, task_pid_nr(current)); |
4e37958d SRV |
1195 | *calltime = ktime_get(); |
1196 | } | |
1197 | ||
1198 | static __init_or_module void | |
1199 | trace_initcall_finish_cb(void *data, initcall_t fn, int ret) | |
1200 | { | |
374d6cda | 1201 | ktime_t rettime, *calltime = data; |
4e37958d | 1202 | |
22c5c03b | 1203 | rettime = ktime_get(); |
58e2cf5d | 1204 | printk(KERN_DEBUG "initcall %pS returned %d after %lld usecs\n", |
105e8c2e | 1205 | fn, ret, (unsigned long long)ktime_us_delta(rettime, *calltime)); |
4e37958d | 1206 | } |
1da177e4 | 1207 | |
4e37958d SRV |
1208 | static ktime_t initcall_calltime; |
1209 | ||
b0dc52f1 | 1210 | #ifdef TRACEPOINTS_ENABLED |
4e37958d SRV |
1211 | static void __init initcall_debug_enable(void) |
1212 | { | |
1213 | int ret; | |
1214 | ||
1215 | ret = register_trace_initcall_start(trace_initcall_start_cb, | |
1216 | &initcall_calltime); | |
1217 | ret |= register_trace_initcall_finish(trace_initcall_finish_cb, | |
1218 | &initcall_calltime); | |
1219 | WARN(ret, "Failed to register initcall tracepoints\n"); | |
22c5c03b | 1220 | } |
b0dc52f1 SRV |
1221 | # define do_trace_initcall_start trace_initcall_start |
1222 | # define do_trace_initcall_finish trace_initcall_finish | |
1223 | #else | |
1224 | static inline void do_trace_initcall_start(initcall_t fn) | |
1225 | { | |
1226 | if (!initcall_debug) | |
1227 | return; | |
1228 | trace_initcall_start_cb(&initcall_calltime, fn); | |
1229 | } | |
1230 | static inline void do_trace_initcall_finish(initcall_t fn, int ret) | |
1231 | { | |
1232 | if (!initcall_debug) | |
1233 | return; | |
1234 | trace_initcall_finish_cb(&initcall_calltime, fn, ret); | |
1235 | } | |
1236 | #endif /* !TRACEPOINTS_ENABLED */ | |
22c5c03b | 1237 | |
e4461271 | 1238 | int __init_or_module do_one_initcall(initcall_t fn) |
22c5c03b KW |
1239 | { |
1240 | int count = preempt_count(); | |
ff1c8fac | 1241 | char msgbuf[64]; |
4e37958d | 1242 | int ret; |
22c5c03b | 1243 | |
7b0b73d7 PB |
1244 | if (initcall_blacklisted(fn)) |
1245 | return -EPERM; | |
1246 | ||
b0dc52f1 | 1247 | do_trace_initcall_start(fn); |
4e37958d | 1248 | ret = fn(); |
b0dc52f1 | 1249 | do_trace_initcall_finish(fn, ret); |
8f0c45cd | 1250 | |
e0df154f | 1251 | msgbuf[0] = 0; |
e662e1cf | 1252 | |
e0df154f | 1253 | if (preempt_count() != count) { |
bf5d770b | 1254 | sprintf(msgbuf, "preemption imbalance "); |
4a2b4b22 | 1255 | preempt_count_set(count); |
1da177e4 | 1256 | } |
e0df154f | 1257 | if (irqs_disabled()) { |
a76bfd0d | 1258 | strlcat(msgbuf, "disabled interrupts ", sizeof(msgbuf)); |
e0df154f LT |
1259 | local_irq_enable(); |
1260 | } | |
d75f773c | 1261 | WARN(msgbuf[0], "initcall %pS returned with %s\n", fn, msgbuf); |
59f9415f | 1262 | |
38addce8 | 1263 | add_latent_entropy(); |
30dbb20e | 1264 | return ret; |
e0df154f LT |
1265 | } |
1266 | ||
1267 | ||
1b1eeca7 | 1268 | static initcall_entry_t *initcall_levels[] __initdata = { |
026cee00 PM |
1269 | __initcall0_start, |
1270 | __initcall1_start, | |
1271 | __initcall2_start, | |
1272 | __initcall3_start, | |
1273 | __initcall4_start, | |
1274 | __initcall5_start, | |
1275 | __initcall6_start, | |
1276 | __initcall7_start, | |
1277 | __initcall_end, | |
1278 | }; | |
1279 | ||
96263d28 | 1280 | /* Keep these in sync with initcalls in include/linux/init.h */ |
7c8f7193 | 1281 | static const char *initcall_level_names[] __initdata = { |
a6fb6012 | 1282 | "pure", |
9fb48c74 JC |
1283 | "core", |
1284 | "postcore", | |
1285 | "arch", | |
1286 | "subsys", | |
1287 | "fs", | |
1288 | "device", | |
1289 | "late", | |
026cee00 PM |
1290 | }; |
1291 | ||
7e2762e1 AS |
1292 | static int __init ignore_unknown_bootoption(char *param, char *val, |
1293 | const char *unused, void *arg) | |
1294 | { | |
1295 | return 0; | |
1296 | } | |
1297 | ||
0068c92a | 1298 | static void __init do_initcall_level(int level, char *command_line) |
e0df154f | 1299 | { |
1b1eeca7 | 1300 | initcall_entry_t *fn; |
e0df154f | 1301 | |
026cee00 | 1302 | parse_args(initcall_level_names[level], |
0068c92a | 1303 | command_line, __start___param, |
026cee00 PM |
1304 | __stop___param - __start___param, |
1305 | level, level, | |
7e2762e1 | 1306 | NULL, ignore_unknown_bootoption); |
026cee00 | 1307 | |
4ee7c60d | 1308 | trace_initcall_level(initcall_level_names[level]); |
026cee00 | 1309 | for (fn = initcall_levels[level]; fn < initcall_levels[level+1]; fn++) |
1b1eeca7 | 1310 | do_one_initcall(initcall_from_entry(fn)); |
1da177e4 LT |
1311 | } |
1312 | ||
026cee00 PM |
1313 | static void __init do_initcalls(void) |
1314 | { | |
1315 | int level; | |
941baf6f | 1316 | size_t len = saved_command_line_len + 1; |
0068c92a MH |
1317 | char *command_line; |
1318 | ||
1319 | command_line = kzalloc(len, GFP_KERNEL); | |
1320 | if (!command_line) | |
1321 | panic("%s: Failed to allocate %zu bytes\n", __func__, len); | |
1322 | ||
1323 | for (level = 0; level < ARRAY_SIZE(initcall_levels) - 1; level++) { | |
1324 | /* Parser modifies command_line, restore it each time */ | |
1325 | strcpy(command_line, saved_command_line); | |
1326 | do_initcall_level(level, command_line); | |
1327 | } | |
026cee00 | 1328 | |
0068c92a | 1329 | kfree(command_line); |
026cee00 PM |
1330 | } |
1331 | ||
1da177e4 LT |
1332 | /* |
1333 | * Ok, the machine is now initialized. None of the devices | |
1334 | * have been touched yet, but the CPU subsystem is up and | |
1335 | * running, and memory and process management works. | |
1336 | * | |
1337 | * Now we can finally start doing some real work.. | |
1338 | */ | |
1339 | static void __init do_basic_setup(void) | |
1340 | { | |
759ee091 | 1341 | cpuset_init_smp(); |
1da177e4 | 1342 | driver_init(); |
b04c3afb | 1343 | init_irq_proc(); |
b99b87f7 | 1344 | do_ctors(); |
b0f84374 | 1345 | do_initcalls(); |
1da177e4 LT |
1346 | } |
1347 | ||
7babe8db | 1348 | static void __init do_pre_smp_initcalls(void) |
c2147a50 | 1349 | { |
1b1eeca7 | 1350 | initcall_entry_t *fn; |
c2147a50 | 1351 | |
4ee7c60d | 1352 | trace_initcall_level("early"); |
026cee00 | 1353 | for (fn = __initcall_start; fn < __initcall0_start; fn++) |
1b1eeca7 | 1354 | do_one_initcall(initcall_from_entry(fn)); |
c2147a50 EGM |
1355 | } |
1356 | ||
a74fb73c | 1357 | static int run_init_process(const char *init_filename) |
1da177e4 | 1358 | { |
b88c50ac AS |
1359 | const char *const *p; |
1360 | ||
1da177e4 | 1361 | argv_init[0] = init_filename; |
3f5c15d8 | 1362 | pr_info("Run %s as init process\n", init_filename); |
b88c50ac AS |
1363 | pr_debug(" with arguments:\n"); |
1364 | for (p = argv_init; *p; p++) | |
1365 | pr_debug(" %s\n", *p); | |
1366 | pr_debug(" with environment:\n"); | |
1367 | for (p = envp_init; *p; p++) | |
1368 | pr_debug(" %s\n", *p); | |
be619f7f | 1369 | return kernel_execve(init_filename, argv_init, envp_init); |
1da177e4 LT |
1370 | } |
1371 | ||
ba24762b MO |
1372 | static int try_to_run_init_process(const char *init_filename) |
1373 | { | |
1374 | int ret; | |
1375 | ||
1376 | ret = run_init_process(init_filename); | |
1377 | ||
1378 | if (ret && ret != -ENOENT) { | |
1379 | pr_err("Starting init: %s exists but couldn't execute it (error %d)\n", | |
1380 | init_filename, ret); | |
1381 | } | |
1382 | ||
1383 | return ret; | |
1384 | } | |
1385 | ||
f80b0c90 | 1386 | static noinline void __init kernel_init_freeable(void); |
d6b21238 | 1387 | |
0f5bf6d0 | 1388 | #if defined(CONFIG_STRICT_KERNEL_RWX) || defined(CONFIG_STRICT_MODULE_RWX) |
39290b38 | 1389 | bool rodata_enabled __ro_after_init = true; |
2e8cff0a MR |
1390 | |
1391 | #ifndef arch_parse_debug_rodata | |
1392 | static inline bool arch_parse_debug_rodata(char *str) { return false; } | |
1393 | #endif | |
1394 | ||
d2aa1aca KC |
1395 | static int __init set_debug_rodata(char *str) |
1396 | { | |
2e8cff0a MR |
1397 | if (arch_parse_debug_rodata(str)) |
1398 | return 0; | |
1399 | ||
1400 | if (str && !strcmp(str, "on")) | |
1401 | rodata_enabled = true; | |
1402 | else if (str && !strcmp(str, "off")) | |
1403 | rodata_enabled = false; | |
1404 | else | |
f9a40b08 | 1405 | pr_warn("Invalid option string for rodata: '%s'\n", str); |
2e8cff0a | 1406 | return 0; |
d2aa1aca | 1407 | } |
2e8cff0a | 1408 | early_param("rodata", set_debug_rodata); |
39290b38 | 1409 | #endif |
d2aa1aca KC |
1410 | |
1411 | static void mark_readonly(void) | |
1412 | { | |
398ec3e9 | 1413 | if (IS_ENABLED(CONFIG_STRICT_KERNEL_RWX) && rodata_enabled) { |
ae646f0b | 1414 | /* |
ba180314 | 1415 | * load_module() results in W+X mappings, which are cleaned |
8f8cd6c0 | 1416 | * up with init_free_wq. Let's make sure that queued work is |
ae646f0b JH |
1417 | * flushed so that we don't hit false positives looking for |
1418 | * insecure pages which are W+X. | |
1419 | */ | |
8f8cd6c0 | 1420 | flush_module_init_free_work(); |
91a1d97e | 1421 | jump_label_init_ro(); |
d2aa1aca | 1422 | mark_rodata_ro(); |
a5e8131a | 1423 | debug_checkwx(); |
2959a5f7 | 1424 | rodata_test(); |
398ec3e9 | 1425 | } else if (IS_ENABLED(CONFIG_STRICT_KERNEL_RWX)) { |
d2aa1aca | 1426 | pr_info("Kernel memory protection disabled.\n"); |
398ec3e9 CL |
1427 | } else if (IS_ENABLED(CONFIG_ARCH_HAS_STRICT_KERNEL_RWX)) { |
1428 | pr_warn("Kernel memory protection not selected by kernel config.\n"); | |
1429 | } else { | |
1430 | pr_warn("This architecture does not have kernel memory protection.\n"); | |
1431 | } | |
d2aa1aca | 1432 | } |
d2aa1aca | 1433 | |
997aef68 MR |
1434 | void __weak free_initmem(void) |
1435 | { | |
f4039999 | 1436 | free_initmem_default(POISON_FREE_INITMEM); |
997aef68 MR |
1437 | } |
1438 | ||
d6b21238 | 1439 | static int __ref kernel_init(void *unused) |
ee5bfa64 | 1440 | { |
ba24762b MO |
1441 | int ret; |
1442 | ||
15faafc6 PZ |
1443 | /* |
1444 | * Wait until kthreadd is all set-up. | |
1445 | */ | |
1446 | wait_for_completion(&kthreadd_done); | |
1447 | ||
d6b21238 | 1448 | kernel_init_freeable(); |
22a9d645 AV |
1449 | /* need to finish all async __init code before freeing the memory */ |
1450 | async_synchronize_full(); | |
d2635f20 CL |
1451 | |
1452 | system_state = SYSTEM_FREEING_INITMEM; | |
82d083ab | 1453 | kprobe_free_init_mem(); |
b80f0f6c | 1454 | ftrace_free_init_mem(); |
d54ce615 | 1455 | kgdb_free_init_mem(); |
40caa127 | 1456 | exit_boot_config(); |
ee5bfa64 | 1457 | free_initmem(); |
d2aa1aca | 1458 | mark_readonly(); |
b976690f JR |
1459 | |
1460 | /* | |
1461 | * Kernel mappings are now finalized - update the userspace page-table | |
1462 | * to finalize PTI. | |
1463 | */ | |
1464 | pti_finalize(); | |
1465 | ||
ee5bfa64 VG |
1466 | system_state = SYSTEM_RUNNING; |
1467 | numa_default_policy(); | |
1468 | ||
967dcb8f PM |
1469 | rcu_end_inkernel_boot(); |
1470 | ||
3db978d4 VB |
1471 | do_sysctl_args(); |
1472 | ||
ee5bfa64 | 1473 | if (ramdisk_execute_command) { |
ba24762b MO |
1474 | ret = run_init_process(ramdisk_execute_command); |
1475 | if (!ret) | |
a74fb73c | 1476 | return 0; |
ba24762b MO |
1477 | pr_err("Failed to execute %s (error %d)\n", |
1478 | ramdisk_execute_command, ret); | |
ee5bfa64 VG |
1479 | } |
1480 | ||
1481 | /* | |
1482 | * We try each of these until one succeeds. | |
1483 | * | |
1484 | * The Bourne shell can be used instead of init if we are | |
1485 | * trying to recover a really broken machine. | |
1486 | */ | |
1487 | if (execute_command) { | |
ba24762b MO |
1488 | ret = run_init_process(execute_command); |
1489 | if (!ret) | |
a74fb73c | 1490 | return 0; |
6ef4536e AL |
1491 | panic("Requested init %s failed (error %d).", |
1492 | execute_command, ret); | |
ee5bfa64 | 1493 | } |
ada4ab7a CD |
1494 | |
1495 | if (CONFIG_DEFAULT_INIT[0] != '\0') { | |
1496 | ret = run_init_process(CONFIG_DEFAULT_INIT); | |
1497 | if (ret) | |
1498 | pr_err("Default init %s failed (error %d)\n", | |
1499 | CONFIG_DEFAULT_INIT, ret); | |
1500 | else | |
1501 | return 0; | |
1502 | } | |
1503 | ||
ba24762b MO |
1504 | if (!try_to_run_init_process("/sbin/init") || |
1505 | !try_to_run_init_process("/etc/init") || | |
1506 | !try_to_run_init_process("/bin/init") || | |
1507 | !try_to_run_init_process("/bin/sh")) | |
a74fb73c | 1508 | return 0; |
ee5bfa64 | 1509 | |
ba24762b | 1510 | panic("No working init found. Try passing init= option to kernel. " |
8c27ceff | 1511 | "See Linux Documentation/admin-guide/init.rst for guidance."); |
ee5bfa64 VG |
1512 | } |
1513 | ||
8f740636 | 1514 | /* Open /dev/console, for stdin/stdout/stderr, this should never fail */ |
a94b5214 | 1515 | void __init console_on_rootfs(void) |
b49a733d | 1516 | { |
8f740636 | 1517 | struct file *file = filp_open("/dev/console", O_RDWR, 0); |
b49a733d | 1518 | |
8f740636 | 1519 | if (IS_ERR(file)) { |
a91bd622 PM |
1520 | pr_err("Warning: unable to open an initial console.\n"); |
1521 | return; | |
8f740636 | 1522 | } |
f0735310 CH |
1523 | init_dup(file); |
1524 | init_dup(file); | |
1525 | init_dup(file); | |
1526 | fput(file); | |
b49a733d DB |
1527 | } |
1528 | ||
f80b0c90 | 1529 | static noinline void __init kernel_init_freeable(void) |
1da177e4 | 1530 | { |
31a67102 LT |
1531 | /* Now the scheduler is fully set up and can do blocking allocations */ |
1532 | gfp_allowed_mask = __GFP_BITS_MASK; | |
1533 | ||
58568d2a MX |
1534 | /* |
1535 | * init can allocate pages on any node | |
1536 | */ | |
3c466d46 | 1537 | set_mems_allowed(node_states[N_MEMORY]); |
1da177e4 | 1538 | |
0711f0d7 | 1539 | cad_pid = get_pid(task_pid(current)); |
9ec52099 | 1540 | |
ca74a6f8 | 1541 | smp_prepare_cpus(setup_max_cpus); |
1da177e4 | 1542 | |
3347fa09 TH |
1543 | workqueue_init(); |
1544 | ||
597b7305 MH |
1545 | init_mm_internals(); |
1546 | ||
1b04fa99 | 1547 | rcu_init_tasks_generic(); |
1da177e4 | 1548 | do_pre_smp_initcalls(); |
004417a6 | 1549 | lockup_detector_init(); |
1da177e4 | 1550 | |
1da177e4 LT |
1551 | smp_init(); |
1552 | sched_init_smp(); | |
1553 | ||
2930155b | 1554 | workqueue_init_topology(); |
bf52b1ac | 1555 | async_init(); |
f1b192b1 | 1556 | padata_init(); |
0e1cc95b MG |
1557 | page_alloc_init_late(); |
1558 | ||
1da177e4 LT |
1559 | do_basic_setup(); |
1560 | ||
8c0d8849 BH |
1561 | kunit_run_all_tests(); |
1562 | ||
e7cb072e | 1563 | wait_for_initramfs(); |
b49a733d | 1564 | console_on_rootfs(); |
2bd3a997 | 1565 | |
1da177e4 LT |
1566 | /* |
1567 | * check if there is an early userspace init. If yes, let it do all | |
1568 | * the work | |
1569 | */ | |
eb9d7d39 | 1570 | if (init_eaccess(ramdisk_execute_command) != 0) { |
ffdfc409 | 1571 | ramdisk_execute_command = NULL; |
1da177e4 | 1572 | prepare_namespace(); |
ffdfc409 | 1573 | } |
1da177e4 LT |
1574 | |
1575 | /* | |
1576 | * Ok, we have completed the initial bootup, and | |
1577 | * we're essentially up and running. Get rid of the | |
1578 | * initmem segments and start the user-mode stuff.. | |
c9cd2ce2 DK |
1579 | * |
1580 | * rootfs is available now, try loading the public keys | |
1581 | * and default modules | |
1da177e4 | 1582 | */ |
bb813f4c | 1583 | |
c9cd2ce2 | 1584 | integrity_load_keys(); |
1da177e4 | 1585 | } |