]>
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> | |
db64fe02 | 36 | #include <linux/vmalloc.h> |
1da177e4 | 37 | #include <linux/kernel_stat.h> |
d7cd5611 | 38 | #include <linux/start_kernel.h> |
1da177e4 | 39 | #include <linux/security.h> |
3d442233 | 40 | #include <linux/smp.h> |
1da177e4 LT |
41 | #include <linux/profile.h> |
42 | #include <linux/rcupdate.h> | |
43 | #include <linux/moduleparam.h> | |
44 | #include <linux/kallsyms.h> | |
45 | #include <linux/writeback.h> | |
46 | #include <linux/cpu.h> | |
47 | #include <linux/cpuset.h> | |
ddbcc7e8 | 48 | #include <linux/cgroup.h> |
1da177e4 | 49 | #include <linux/efi.h> |
906568c9 | 50 | #include <linux/tick.h> |
78634061 | 51 | #include <linux/sched/isolation.h> |
6168a702 | 52 | #include <linux/interrupt.h> |
c757249a | 53 | #include <linux/taskstats_kern.h> |
ca74e92b | 54 | #include <linux/delayacct.h> |
1da177e4 | 55 | #include <linux/unistd.h> |
3ea056c5 | 56 | #include <linux/utsname.h> |
1da177e4 LT |
57 | #include <linux/rmap.h> |
58 | #include <linux/mempolicy.h> | |
59 | #include <linux/key.h> | |
b6cd0b77 | 60 | #include <linux/buffer_head.h> |
eefa864b | 61 | #include <linux/page_ext.h> |
9a11b49a | 62 | #include <linux/debug_locks.h> |
3ac7fe5a | 63 | #include <linux/debugobjects.h> |
fbb9ce95 | 64 | #include <linux/lockdep.h> |
3c7b4e6b | 65 | #include <linux/kmemleak.h> |
f1b192b1 | 66 | #include <linux/padata.h> |
84d73786 | 67 | #include <linux/pid_namespace.h> |
4c002c97 | 68 | #include <linux/device/driver.h> |
73c27992 | 69 | #include <linux/kthread.h> |
e6fe6649 | 70 | #include <linux/sched.h> |
1777e463 | 71 | #include <linux/sched/init.h> |
a1c9eea9 | 72 | #include <linux/signal.h> |
199f0ca5 | 73 | #include <linux/idr.h> |
0b4b3827 | 74 | #include <linux/kgdb.h> |
68bf21aa | 75 | #include <linux/ftrace.h> |
22a9d645 | 76 | #include <linux/async.h> |
6ae6996a | 77 | #include <linux/sfi.h> |
2b2af54a | 78 | #include <linux/shmem_fs.h> |
5a0e3ad6 | 79 | #include <linux/slab.h> |
24a24bb6 | 80 | #include <linux/perf_event.h> |
a74fb73c | 81 | #include <linux/ptrace.h> |
aa8c6248 | 82 | #include <linux/pti.h> |
bb813f4c TH |
83 | #include <linux/blkdev.h> |
84 | #include <linux/elevator.h> | |
5d2a4e91 | 85 | #include <linux/sched/clock.h> |
29930025 | 86 | #include <linux/sched/task.h> |
68db0cf1 | 87 | #include <linux/sched/task_stack.h> |
65f382fd | 88 | #include <linux/context_tracking.h> |
47d06e53 | 89 | #include <linux/random.h> |
7b0b73d7 | 90 | #include <linux/list.h> |
c9cd2ce2 | 91 | #include <linux/integrity.h> |
e149ed2b | 92 | #include <linux/proc_ns.h> |
0ddab1d2 | 93 | #include <linux/io.h> |
39290b38 | 94 | #include <linux/cache.h> |
2959a5f7 | 95 | #include <linux/rodata_test.h> |
33352244 | 96 | #include <linux/jump_label.h> |
ae67d58d | 97 | #include <linux/mem_encrypt.h> |
1da177e4 LT |
98 | |
99 | #include <asm/io.h> | |
100 | #include <asm/bugs.h> | |
101 | #include <asm/setup.h> | |
a940199f | 102 | #include <asm/sections.h> |
37b73c82 | 103 | #include <asm/cacheflush.h> |
1da177e4 | 104 | |
4ee7c60d SRV |
105 | #define CREATE_TRACE_POINTS |
106 | #include <trace/events/initcall.h> | |
107 | ||
aae5f662 | 108 | static int kernel_init(void *); |
1da177e4 LT |
109 | |
110 | extern void init_IRQ(void); | |
1da177e4 | 111 | extern void radix_tree_init(void); |
1da177e4 | 112 | |
2ce802f6 TH |
113 | /* |
114 | * Debug helper: via this flag we know that we are in 'early bootup code' | |
115 | * where only the boot processor is running with IRQ disabled. This means | |
116 | * two things - IRQ must not be enabled before the flag is cleared and some | |
117 | * operations which are not allowed with IRQ disabled are allowed while the | |
118 | * flag is set. | |
119 | */ | |
120 | bool early_boot_irqs_disabled __read_mostly; | |
121 | ||
a6826048 | 122 | enum system_states system_state __read_mostly; |
1da177e4 LT |
123 | EXPORT_SYMBOL(system_state); |
124 | ||
125 | /* | |
126 | * Boot command-line arguments | |
127 | */ | |
128 | #define MAX_INIT_ARGS CONFIG_INIT_ENV_ARG_LIMIT | |
129 | #define MAX_INIT_ENVS CONFIG_INIT_ENV_ARG_LIMIT | |
130 | ||
131 | extern void time_init(void); | |
132 | /* Default late time init is NULL. archs can override this later. */ | |
d2e3192b | 133 | void (*__initdata late_time_init)(void); |
1da177e4 | 134 | |
30d7e0d4 ABL |
135 | /* Untouched command line saved by arch-specific code. */ |
136 | char __initdata boot_command_line[COMMAND_LINE_SIZE]; | |
137 | /* Untouched saved command line (eg. for /proc) */ | |
138 | char *saved_command_line; | |
139 | /* Command line for parameter parsing */ | |
140 | static char *static_command_line; | |
51887d03 MH |
141 | /* Untouched extra command line */ |
142 | static char *extra_command_line; | |
13199162 MH |
143 | /* Extra init arguments */ |
144 | static char *extra_init_args; | |
1da177e4 | 145 | |
f61872bb SRV |
146 | #ifdef CONFIG_BOOT_CONFIG |
147 | /* Is bootconfig on command line? */ | |
148 | static bool bootconfig_found; | |
149 | static bool initargs_found; | |
150 | #else | |
151 | # define bootconfig_found false | |
152 | # define initargs_found false | |
153 | #endif | |
154 | ||
1da177e4 | 155 | static char *execute_command; |
ffdfc409 | 156 | static char *ramdisk_execute_command; |
1da177e4 | 157 | |
c4b2c0c5 HFS |
158 | /* |
159 | * Used to generate warnings if static_key manipulation functions are used | |
160 | * before jump_label_init is called. | |
161 | */ | |
dd4d9fec | 162 | bool static_key_initialized __read_mostly; |
c4b2c0c5 HFS |
163 | EXPORT_SYMBOL_GPL(static_key_initialized); |
164 | ||
8b3b2955 JB |
165 | /* |
166 | * If set, this is an indication to the drivers that reset the underlying | |
167 | * device before going ahead with the initialization otherwise driver might | |
168 | * rely on the BIOS and skip the reset operation. | |
169 | * | |
170 | * This is useful if kernel is booting in an unreliable environment. | |
fc454fdc | 171 | * For ex. kdump situation where previous kernel has crashed, BIOS has been |
8b3b2955 JB |
172 | * skipped and devices will be in unknown state. |
173 | */ | |
174 | unsigned int reset_devices; | |
175 | EXPORT_SYMBOL(reset_devices); | |
1da177e4 | 176 | |
7e96287d VG |
177 | static int __init set_reset_devices(char *str) |
178 | { | |
179 | reset_devices = 1; | |
180 | return 1; | |
181 | } | |
182 | ||
183 | __setup("reset_devices", set_reset_devices); | |
184 | ||
dd4d9fec FF |
185 | static const char *argv_init[MAX_INIT_ARGS+2] = { "init", NULL, }; |
186 | const char *envp_init[MAX_INIT_ENVS+2] = { "HOME=/", "TERM=linux", NULL, }; | |
1da177e4 LT |
187 | static const char *panic_later, *panic_param; |
188 | ||
914dcaa8 | 189 | extern const struct obs_kernel_param __setup_start[], __setup_end[]; |
1da177e4 | 190 | |
31c025b5 | 191 | static bool __init obsolete_checksetup(char *line) |
1da177e4 | 192 | { |
914dcaa8 | 193 | const struct obs_kernel_param *p; |
31c025b5 | 194 | bool had_early_param = false; |
1da177e4 LT |
195 | |
196 | p = __setup_start; | |
197 | do { | |
198 | int n = strlen(p->str); | |
b1e4d20c | 199 | if (parameqn(line, p->str, n)) { |
1da177e4 | 200 | if (p->early) { |
33df0d19 RR |
201 | /* Already done in parse_early_param? |
202 | * (Needs exact match on param part). | |
203 | * Keep iterating, as we can have early | |
204 | * params and __setups of same names 8( */ | |
1da177e4 | 205 | if (line[n] == '\0' || line[n] == '=') |
31c025b5 | 206 | had_early_param = true; |
1da177e4 | 207 | } else if (!p->setup_func) { |
ea676e84 AM |
208 | pr_warn("Parameter %s is obsolete, ignored\n", |
209 | p->str); | |
31c025b5 | 210 | return true; |
1da177e4 | 211 | } else if (p->setup_func(line + n)) |
31c025b5 | 212 | return true; |
1da177e4 LT |
213 | } |
214 | p++; | |
215 | } while (p < __setup_end); | |
33df0d19 RR |
216 | |
217 | return had_early_param; | |
1da177e4 LT |
218 | } |
219 | ||
220 | /* | |
221 | * This should be approx 2 Bo*oMips to start (note initial shift), and will | |
222 | * still work even if initially too large, it will just take slightly longer | |
223 | */ | |
224 | unsigned long loops_per_jiffy = (1<<12); | |
1da177e4 LT |
225 | EXPORT_SYMBOL(loops_per_jiffy); |
226 | ||
227 | static int __init debug_kernel(char *str) | |
228 | { | |
a8fe19eb | 229 | console_loglevel = CONSOLE_LOGLEVEL_DEBUG; |
f6f21c81 | 230 | return 0; |
1da177e4 LT |
231 | } |
232 | ||
233 | static int __init quiet_kernel(char *str) | |
234 | { | |
a8fe19eb | 235 | console_loglevel = CONSOLE_LOGLEVEL_QUIET; |
f6f21c81 | 236 | return 0; |
1da177e4 LT |
237 | } |
238 | ||
f6f21c81 YL |
239 | early_param("debug", debug_kernel); |
240 | early_param("quiet", quiet_kernel); | |
1da177e4 LT |
241 | |
242 | static int __init loglevel(char *str) | |
243 | { | |
808bf29b AS |
244 | int newlevel; |
245 | ||
246 | /* | |
247 | * Only update loglevel value when a correct setting was passed, | |
248 | * to prevent blind crashes (when loglevel being set to 0) that | |
249 | * are quite hard to debug | |
250 | */ | |
251 | if (get_option(&str, &newlevel)) { | |
252 | console_loglevel = newlevel; | |
253 | return 0; | |
254 | } | |
255 | ||
256 | return -EINVAL; | |
1da177e4 LT |
257 | } |
258 | ||
f6f21c81 | 259 | early_param("loglevel", loglevel); |
1da177e4 | 260 | |
de462e5f MH |
261 | #ifdef CONFIG_BLK_DEV_INITRD |
262 | static void * __init get_boot_config_from_initrd(u32 *_size, u32 *_csum) | |
263 | { | |
264 | u32 size, csum; | |
265 | char *data; | |
266 | u32 *hdr; | |
267 | ||
268 | if (!initrd_end) | |
269 | return NULL; | |
270 | ||
271 | data = (char *)initrd_end - BOOTCONFIG_MAGIC_LEN; | |
272 | if (memcmp(data, BOOTCONFIG_MAGIC, BOOTCONFIG_MAGIC_LEN)) | |
273 | return NULL; | |
274 | ||
275 | hdr = (u32 *)(data - 8); | |
276 | size = hdr[0]; | |
277 | csum = hdr[1]; | |
278 | ||
279 | data = ((void *)hdr) - size; | |
280 | if ((unsigned long)data < initrd_start) { | |
281 | pr_err("bootconfig size %d is greater than initrd size %ld\n", | |
282 | size, initrd_end - initrd_start); | |
283 | return NULL; | |
284 | } | |
285 | ||
286 | /* Remove bootconfig from initramfs/initrd */ | |
287 | initrd_end = (unsigned long)data; | |
288 | if (_size) | |
289 | *_size = size; | |
290 | if (_csum) | |
291 | *_csum = csum; | |
292 | ||
293 | return data; | |
294 | } | |
295 | #else | |
296 | static void * __init get_boot_config_from_initrd(u32 *_size, u32 *_csum) | |
297 | { | |
298 | return NULL; | |
299 | } | |
300 | #endif | |
301 | ||
7684b858 | 302 | #ifdef CONFIG_BOOT_CONFIG |
51887d03 MH |
303 | |
304 | char xbc_namebuf[XBC_KEYLEN_MAX] __initdata; | |
305 | ||
306 | #define rest(dst, end) ((end) > (dst) ? (end) - (dst) : 0) | |
307 | ||
308 | static int __init xbc_snprint_cmdline(char *buf, size_t size, | |
309 | struct xbc_node *root) | |
310 | { | |
311 | struct xbc_node *knode, *vnode; | |
312 | char *end = buf + size; | |
51887d03 MH |
313 | const char *val; |
314 | int ret; | |
315 | ||
316 | xbc_node_for_each_key_value(root, knode, val) { | |
317 | ret = xbc_node_compose_key_after(root, knode, | |
318 | xbc_namebuf, XBC_KEYLEN_MAX); | |
319 | if (ret < 0) | |
320 | return ret; | |
321 | ||
322 | vnode = xbc_node_get_child(knode); | |
88b91371 MH |
323 | if (!vnode) { |
324 | ret = snprintf(buf, rest(buf, end), "%s ", xbc_namebuf); | |
325 | if (ret < 0) | |
326 | return ret; | |
327 | buf += ret; | |
51887d03 | 328 | continue; |
88b91371 | 329 | } |
51887d03 | 330 | xbc_array_for_each_value(vnode, val) { |
88b91371 MH |
331 | ret = snprintf(buf, rest(buf, end), "%s=\"%s\" ", |
332 | xbc_namebuf, val); | |
51887d03 MH |
333 | if (ret < 0) |
334 | return ret; | |
335 | buf += ret; | |
51887d03 | 336 | } |
51887d03 MH |
337 | } |
338 | ||
339 | return buf - (end - size); | |
340 | } | |
341 | #undef rest | |
342 | ||
343 | /* Make an extra command line under given key word */ | |
344 | static char * __init xbc_make_cmdline(const char *key) | |
345 | { | |
346 | struct xbc_node *root; | |
347 | char *new_cmdline; | |
348 | int ret, len = 0; | |
349 | ||
350 | root = xbc_find_node(key); | |
351 | if (!root) | |
352 | return NULL; | |
353 | ||
354 | /* Count required buffer size */ | |
355 | len = xbc_snprint_cmdline(NULL, 0, root); | |
356 | if (len <= 0) | |
357 | return NULL; | |
358 | ||
359 | new_cmdline = memblock_alloc(len + 1, SMP_CACHE_BYTES); | |
360 | if (!new_cmdline) { | |
361 | pr_err("Failed to allocate memory for extra kernel cmdline.\n"); | |
362 | return NULL; | |
363 | } | |
364 | ||
365 | ret = xbc_snprint_cmdline(new_cmdline, len + 1, root); | |
366 | if (ret < 0 || ret > len) { | |
367 | pr_err("Failed to print extra kernel cmdline.\n"); | |
368 | return NULL; | |
369 | } | |
370 | ||
371 | return new_cmdline; | |
372 | } | |
373 | ||
08d9e686 | 374 | static u32 boot_config_checksum(unsigned char *p, u32 size) |
7684b858 MH |
375 | { |
376 | u32 ret = 0; | |
377 | ||
378 | while (size--) | |
379 | ret += *p++; | |
380 | ||
381 | return ret; | |
382 | } | |
383 | ||
f61872bb SRV |
384 | static int __init bootconfig_params(char *param, char *val, |
385 | const char *unused, void *arg) | |
386 | { | |
387 | if (strcmp(param, "bootconfig") == 0) { | |
388 | bootconfig_found = true; | |
389 | } else if (strcmp(param, "--") == 0) { | |
390 | initargs_found = true; | |
391 | } | |
392 | return 0; | |
393 | } | |
394 | ||
7495e092 | 395 | static void __init setup_boot_config(const char *cmdline) |
7684b858 | 396 | { |
f61872bb | 397 | static char tmp_cmdline[COMMAND_LINE_SIZE] __initdata; |
89b74cac MH |
398 | const char *msg; |
399 | int pos; | |
7684b858 MH |
400 | u32 size, csum; |
401 | char *data, *copy; | |
a0057403 | 402 | int ret; |
7684b858 | 403 | |
611d0a95 | 404 | /* Cut out the bootconfig data even if we have no bootconfig option */ |
de462e5f | 405 | data = get_boot_config_from_initrd(&size, &csum); |
de462e5f | 406 | |
f61872bb SRV |
407 | strlcpy(tmp_cmdline, boot_command_line, COMMAND_LINE_SIZE); |
408 | parse_args("bootconfig", tmp_cmdline, NULL, 0, 0, 0, NULL, | |
409 | bootconfig_params); | |
410 | ||
411 | if (!bootconfig_found) | |
7684b858 MH |
412 | return; |
413 | ||
611d0a95 MH |
414 | if (!data) { |
415 | pr_err("'bootconfig' found on command line, but no bootconfig found\n"); | |
416 | return; | |
417 | } | |
418 | ||
7495e092 SRV |
419 | if (size >= XBC_DATA_MAX) { |
420 | pr_err("bootconfig size %d greater than max size %d\n", | |
421 | size, XBC_DATA_MAX); | |
7684b858 | 422 | return; |
7495e092 | 423 | } |
7684b858 | 424 | |
7495e092 SRV |
425 | if (boot_config_checksum((unsigned char *)data, size) != csum) { |
426 | pr_err("bootconfig checksum failed\n"); | |
7684b858 | 427 | return; |
7495e092 | 428 | } |
7684b858 MH |
429 | |
430 | copy = memblock_alloc(size + 1, SMP_CACHE_BYTES); | |
431 | if (!copy) { | |
e241d14a | 432 | pr_err("Failed to allocate memory for bootconfig\n"); |
7684b858 MH |
433 | return; |
434 | } | |
435 | ||
436 | memcpy(copy, data, size); | |
437 | copy[size] = '\0'; | |
438 | ||
89b74cac MH |
439 | ret = xbc_init(copy, &msg, &pos); |
440 | if (ret < 0) { | |
441 | if (pos < 0) | |
442 | pr_err("Failed to init bootconfig: %s.\n", msg); | |
443 | else | |
444 | pr_err("Failed to parse bootconfig: %s at %d.\n", | |
445 | msg, pos); | |
446 | } else { | |
a0057403 | 447 | pr_info("Load bootconfig: %d bytes %d nodes\n", size, ret); |
51887d03 MH |
448 | /* keys starting with "kernel." are passed via cmdline */ |
449 | extra_command_line = xbc_make_cmdline("kernel"); | |
13199162 MH |
450 | /* Also, "init." keys are init arguments */ |
451 | extra_init_args = xbc_make_cmdline("init"); | |
51887d03 | 452 | } |
7495e092 | 453 | return; |
7684b858 | 454 | } |
de462e5f | 455 | |
7684b858 | 456 | #else |
de462e5f MH |
457 | |
458 | static void __init setup_boot_config(const char *cmdline) | |
459 | { | |
460 | /* Remove bootconfig data from initrd */ | |
461 | get_boot_config_from_initrd(NULL, NULL); | |
462 | } | |
d8a953dd MH |
463 | |
464 | static int __init warn_bootconfig(char *str) | |
465 | { | |
466 | pr_warn("WARNING: 'bootconfig' found on the kernel command line but CONFIG_BOOTCONFIG is not set.\n"); | |
467 | return 0; | |
468 | } | |
469 | early_param("bootconfig", warn_bootconfig); | |
470 | ||
7684b858 MH |
471 | #endif |
472 | ||
a99cd112 | 473 | /* Change NUL term back to "=", to make "param" the whole string. */ |
7e2762e1 | 474 | static void __init repair_env_string(char *param, char *val) |
1da177e4 | 475 | { |
1da177e4 LT |
476 | if (val) { |
477 | /* param=val or param="val"? */ | |
478 | if (val == param+strlen(param)+1) | |
479 | val[-1] = '='; | |
480 | else if (val == param+strlen(param)+2) { | |
481 | val[-2] = '='; | |
482 | memmove(val-1, val, strlen(val)+1); | |
1da177e4 LT |
483 | } else |
484 | BUG(); | |
485 | } | |
a99cd112 CM |
486 | } |
487 | ||
51e158c1 | 488 | /* Anything after -- gets handed straight to init. */ |
ecc86170 LR |
489 | static int __init set_init_arg(char *param, char *val, |
490 | const char *unused, void *arg) | |
51e158c1 RR |
491 | { |
492 | unsigned int i; | |
493 | ||
494 | if (panic_later) | |
495 | return 0; | |
496 | ||
7e2762e1 | 497 | repair_env_string(param, val); |
51e158c1 RR |
498 | |
499 | for (i = 0; argv_init[i]; i++) { | |
500 | if (i == MAX_INIT_ARGS) { | |
501 | panic_later = "init"; | |
502 | panic_param = param; | |
503 | return 0; | |
504 | } | |
505 | } | |
506 | argv_init[i] = param; | |
507 | return 0; | |
508 | } | |
509 | ||
a99cd112 CM |
510 | /* |
511 | * Unknown boot options get handed to init, unless they look like | |
512 | * unused parameters (modprobe will find them in /proc/cmdline). | |
513 | */ | |
ecc86170 LR |
514 | static int __init unknown_bootoption(char *param, char *val, |
515 | const char *unused, void *arg) | |
a99cd112 | 516 | { |
283900e8 AS |
517 | size_t len = strlen(param); |
518 | ||
7e2762e1 | 519 | repair_env_string(param, val); |
1da177e4 LT |
520 | |
521 | /* Handle obsolete-style parameters */ | |
522 | if (obsolete_checksetup(param)) | |
523 | return 0; | |
524 | ||
f066a4f6 | 525 | /* Unused module parameter. */ |
283900e8 | 526 | if (strnchr(param, len, '.')) |
1da177e4 | 527 | return 0; |
1da177e4 LT |
528 | |
529 | if (panic_later) | |
530 | return 0; | |
531 | ||
532 | if (val) { | |
533 | /* Environment option */ | |
534 | unsigned int i; | |
535 | for (i = 0; envp_init[i]; i++) { | |
536 | if (i == MAX_INIT_ENVS) { | |
499a4584 | 537 | panic_later = "env"; |
1da177e4 LT |
538 | panic_param = param; |
539 | } | |
283900e8 | 540 | if (!strncmp(param, envp_init[i], len+1)) |
1da177e4 LT |
541 | break; |
542 | } | |
543 | envp_init[i] = param; | |
544 | } else { | |
545 | /* Command line option */ | |
546 | unsigned int i; | |
547 | for (i = 0; argv_init[i]; i++) { | |
548 | if (i == MAX_INIT_ARGS) { | |
499a4584 | 549 | panic_later = "init"; |
1da177e4 LT |
550 | panic_param = param; |
551 | } | |
552 | } | |
553 | argv_init[i] = param; | |
554 | } | |
555 | return 0; | |
556 | } | |
557 | ||
558 | static int __init init_setup(char *str) | |
559 | { | |
560 | unsigned int i; | |
561 | ||
562 | execute_command = str; | |
563 | /* | |
564 | * In case LILO is going to boot us with default command line, | |
565 | * it prepends "auto" before the whole cmdline which makes | |
566 | * the shell think it should execute a script with such name. | |
567 | * So we ignore all arguments entered _before_ init=... [MJ] | |
568 | */ | |
569 | for (i = 1; i < MAX_INIT_ARGS; i++) | |
570 | argv_init[i] = NULL; | |
571 | return 1; | |
572 | } | |
573 | __setup("init=", init_setup); | |
574 | ||
ffdfc409 OJ |
575 | static int __init rdinit_setup(char *str) |
576 | { | |
577 | unsigned int i; | |
578 | ||
579 | ramdisk_execute_command = str; | |
580 | /* See "auto" comment in init_setup */ | |
581 | for (i = 1; i < MAX_INIT_ARGS; i++) | |
582 | argv_init[i] = NULL; | |
583 | return 1; | |
584 | } | |
585 | __setup("rdinit=", rdinit_setup); | |
586 | ||
1da177e4 | 587 | #ifndef CONFIG_SMP |
34db18a0 | 588 | static const unsigned int setup_max_cpus = NR_CPUS; |
e0982e90 | 589 | static inline void setup_nr_cpu_ids(void) { } |
1da177e4 | 590 | static inline void smp_prepare_cpus(unsigned int maxcpus) { } |
1da177e4 LT |
591 | #endif |
592 | ||
30d7e0d4 ABL |
593 | /* |
594 | * We need to store the untouched command line for future reference. | |
595 | * We also need to store the touched command line since the parameter | |
596 | * parsing is performed in place, and we should allow a component to | |
597 | * store reference of name/value for future reference. | |
598 | */ | |
599 | static void __init setup_command_line(char *command_line) | |
600 | { | |
13199162 | 601 | size_t len, xlen = 0, ilen = 0; |
f5c7310a | 602 | |
51887d03 MH |
603 | if (extra_command_line) |
604 | xlen = strlen(extra_command_line); | |
13199162 MH |
605 | if (extra_init_args) |
606 | ilen = strlen(extra_init_args) + 4; /* for " -- " */ | |
f5c7310a | 607 | |
51887d03 | 608 | len = xlen + strlen(boot_command_line) + 1; |
f5c7310a | 609 | |
13199162 | 610 | saved_command_line = memblock_alloc(len + ilen, SMP_CACHE_BYTES); |
f5c7310a | 611 | if (!saved_command_line) |
13199162 | 612 | panic("%s: Failed to allocate %zu bytes\n", __func__, len + ilen); |
f5c7310a MR |
613 | |
614 | static_command_line = memblock_alloc(len, SMP_CACHE_BYTES); | |
615 | if (!static_command_line) | |
616 | panic("%s: Failed to allocate %zu bytes\n", __func__, len); | |
617 | ||
51887d03 MH |
618 | if (xlen) { |
619 | /* | |
620 | * We have to put extra_command_line before boot command | |
621 | * lines because there could be dashes (separator of init | |
622 | * command line) in the command lines. | |
623 | */ | |
624 | strcpy(saved_command_line, extra_command_line); | |
625 | strcpy(static_command_line, extra_command_line); | |
626 | } | |
627 | strcpy(saved_command_line + xlen, boot_command_line); | |
628 | strcpy(static_command_line + xlen, command_line); | |
13199162 MH |
629 | |
630 | if (ilen) { | |
631 | /* | |
632 | * Append supplemental init boot args to saved_command_line | |
633 | * so that user can check what command line options passed | |
634 | * to init. | |
635 | */ | |
636 | len = strlen(saved_command_line); | |
f61872bb SRV |
637 | if (initargs_found) { |
638 | saved_command_line[len++] = ' '; | |
639 | } else { | |
13199162 MH |
640 | strcpy(saved_command_line + len, " -- "); |
641 | len += 4; | |
f61872bb | 642 | } |
13199162 MH |
643 | |
644 | strcpy(saved_command_line + len, extra_init_args); | |
645 | } | |
30d7e0d4 ABL |
646 | } |
647 | ||
1da177e4 LT |
648 | /* |
649 | * We need to finalize in a non-__init function or else race conditions | |
650 | * between the root thread and the init thread may cause start_kernel to | |
651 | * be reaped by free_initmem before the root thread has proceeded to | |
652 | * cpu_idle. | |
653 | * | |
654 | * gcc-3.4 accidentally inlines this function, so use noinline. | |
655 | */ | |
656 | ||
b433c3d4 PZ |
657 | static __initdata DECLARE_COMPLETION(kthreadd_done); |
658 | ||
53c99bd6 | 659 | noinline void __ref rest_init(void) |
1da177e4 | 660 | { |
8fb12156 | 661 | struct task_struct *tsk; |
73c27992 EB |
662 | int pid; |
663 | ||
7db905e6 | 664 | rcu_scheduler_starting(); |
b433c3d4 | 665 | /* |
97158569 | 666 | * We need to spawn init first so that it obtains pid 1, however |
b433c3d4 PZ |
667 | * the init task will end up wanting to create kthreads, which, if |
668 | * we schedule it before we create kthreadd, will OOPS. | |
669 | */ | |
8fb12156 TG |
670 | pid = kernel_thread(kernel_init, NULL, CLONE_FS); |
671 | /* | |
672 | * Pin init on the boot CPU. Task migration is not properly working | |
673 | * until sched_init_smp() has been run. It will set the allowed | |
674 | * CPUs for init to the non isolated CPUs. | |
675 | */ | |
676 | rcu_read_lock(); | |
677 | tsk = find_task_by_pid_ns(pid, &init_pid_ns); | |
678 | set_cpus_allowed_ptr(tsk, cpumask_of(smp_processor_id())); | |
679 | rcu_read_unlock(); | |
680 | ||
1da177e4 | 681 | numa_default_policy(); |
73c27992 | 682 | pid = kernel_thread(kthreadd, NULL, CLONE_FS | CLONE_FILES); |
d11c563d | 683 | rcu_read_lock(); |
5cd20455 | 684 | kthreadd_task = find_task_by_pid_ns(pid, &init_pid_ns); |
d11c563d | 685 | rcu_read_unlock(); |
1c3c5eab TG |
686 | |
687 | /* | |
688 | * Enable might_sleep() and smp_processor_id() checks. | |
c1a280b6 | 689 | * They cannot be enabled earlier because with CONFIG_PREEMPTION=y |
1c3c5eab TG |
690 | * kernel_thread() would trigger might_sleep() splats. With |
691 | * CONFIG_PREEMPT_VOLUNTARY=y the init task might have scheduled | |
692 | * already, but it's stuck on the kthreadd_done completion. | |
693 | */ | |
694 | system_state = SYSTEM_SCHEDULING; | |
695 | ||
b433c3d4 | 696 | complete(&kthreadd_done); |
f340c0d1 IM |
697 | |
698 | /* | |
699 | * The boot idle thread must execute schedule() | |
1df21055 | 700 | * at least once to get things moving: |
f340c0d1 | 701 | */ |
bd2f5536 | 702 | schedule_preempt_disabled(); |
5bfb5d69 | 703 | /* Call into cpu_idle with preempt disabled */ |
a1a04ec3 | 704 | cpu_startup_entry(CPUHP_ONLINE); |
1df21055 | 705 | } |
1da177e4 LT |
706 | |
707 | /* Check for early params. */ | |
ecc86170 LR |
708 | static int __init do_early_param(char *param, char *val, |
709 | const char *unused, void *arg) | |
1da177e4 | 710 | { |
914dcaa8 | 711 | const struct obs_kernel_param *p; |
1da177e4 LT |
712 | |
713 | for (p = __setup_start; p < __setup_end; p++) { | |
b1e4d20c | 714 | if ((p->early && parameq(param, p->str)) || |
18a8bd94 YL |
715 | (strcmp(param, "console") == 0 && |
716 | strcmp(p->str, "earlycon") == 0) | |
717 | ) { | |
1da177e4 | 718 | if (p->setup_func(val) != 0) |
ea676e84 | 719 | pr_warn("Malformed early option '%s'\n", param); |
1da177e4 LT |
720 | } |
721 | } | |
722 | /* We accept everything at this stage. */ | |
723 | return 0; | |
724 | } | |
725 | ||
13977091 MD |
726 | void __init parse_early_options(char *cmdline) |
727 | { | |
ecc86170 LR |
728 | parse_args("early options", cmdline, NULL, 0, 0, 0, NULL, |
729 | do_early_param); | |
13977091 MD |
730 | } |
731 | ||
1da177e4 LT |
732 | /* Arch code calls this early on, or if not, just before other parsing. */ |
733 | void __init parse_early_param(void) | |
734 | { | |
dd4d9fec FF |
735 | static int done __initdata; |
736 | static char tmp_cmdline[COMMAND_LINE_SIZE] __initdata; | |
1da177e4 LT |
737 | |
738 | if (done) | |
739 | return; | |
740 | ||
741 | /* All fall through to do_early_param. */ | |
30d7e0d4 | 742 | strlcpy(tmp_cmdline, boot_command_line, COMMAND_LINE_SIZE); |
13977091 | 743 | parse_early_options(tmp_cmdline); |
1da177e4 LT |
744 | done = 1; |
745 | } | |
746 | ||
e7ff3a47 TG |
747 | void __init __weak arch_post_acpi_subsys_init(void) { } |
748 | ||
839ad62e | 749 | void __init __weak smp_setup_processor_id(void) |
033ab7f8 AM |
750 | { |
751 | } | |
752 | ||
eded09cc | 753 | # if THREAD_SIZE >= PAGE_SIZE |
b235beea | 754 | void __init __weak thread_stack_cache_init(void) |
8c9843e5 BH |
755 | { |
756 | } | |
eded09cc | 757 | #endif |
8c9843e5 | 758 | |
c7753208 TL |
759 | void __init __weak mem_encrypt_init(void) { } |
760 | ||
4fc19708 NA |
761 | void __init __weak poking_init(void) { } |
762 | ||
782de70c | 763 | void __init __weak pgtable_cache_init(void) { } |
caa84136 | 764 | |
4e37958d SRV |
765 | bool initcall_debug; |
766 | core_param(initcall_debug, initcall_debug, bool, 0644); | |
b0dc52f1 SRV |
767 | |
768 | #ifdef TRACEPOINTS_ENABLED | |
4e37958d | 769 | static void __init initcall_debug_enable(void); |
b0dc52f1 SRV |
770 | #else |
771 | static inline void initcall_debug_enable(void) | |
772 | { | |
773 | } | |
774 | #endif | |
4e37958d | 775 | |
23a5c8cb AP |
776 | /* Report memory auto-initialization states for this boot. */ |
777 | static void __init report_meminit(void) | |
778 | { | |
779 | const char *stack; | |
780 | ||
781 | if (IS_ENABLED(CONFIG_INIT_STACK_ALL)) | |
782 | stack = "all"; | |
783 | else if (IS_ENABLED(CONFIG_GCC_PLUGIN_STRUCTLEAK_BYREF_ALL)) | |
784 | stack = "byref_all"; | |
785 | else if (IS_ENABLED(CONFIG_GCC_PLUGIN_STRUCTLEAK_BYREF)) | |
786 | stack = "byref"; | |
787 | else if (IS_ENABLED(CONFIG_GCC_PLUGIN_STRUCTLEAK_USER)) | |
788 | stack = "__user"; | |
789 | else | |
790 | stack = "off"; | |
791 | ||
792 | pr_info("mem auto-init: stack:%s, heap alloc:%s, heap free:%s\n", | |
793 | stack, want_init_on_alloc(GFP_KERNEL) ? "on" : "off", | |
794 | want_init_on_free() ? "on" : "off"); | |
795 | if (want_init_on_free()) | |
796 | pr_info("mem auto-init: clearing system memory may take some time...\n"); | |
797 | } | |
798 | ||
444f478f PE |
799 | /* |
800 | * Set up kernel memory allocators | |
801 | */ | |
802 | static void __init mm_init(void) | |
803 | { | |
eefa864b JK |
804 | /* |
805 | * page_ext requires contiguous pages, | |
806 | * bigger than MAX_ORDER unless SPARSEMEM. | |
807 | */ | |
808 | page_ext_init_flatmem(); | |
8e57f8ac | 809 | init_debug_pagealloc(); |
23a5c8cb | 810 | report_meminit(); |
444f478f PE |
811 | mem_init(); |
812 | kmem_cache_init(); | |
c5665868 | 813 | kmemleak_init(); |
b35f1819 | 814 | pgtable_init(); |
a9ee3a63 | 815 | debug_objects_mem_init(); |
444f478f | 816 | vmalloc_init(); |
0ddab1d2 | 817 | ioremap_huge_init(); |
613e396b TG |
818 | /* Should be run before the first non-init thread is created */ |
819 | init_espfix_bsp(); | |
aa8c6248 TG |
820 | /* Should be run after espfix64 is set up. */ |
821 | pti_init(); | |
444f478f PE |
822 | } |
823 | ||
53c99bd6 MS |
824 | void __init __weak arch_call_rest_init(void) |
825 | { | |
826 | rest_init(); | |
827 | } | |
828 | ||
722a9f92 | 829 | asmlinkage __visible void __init start_kernel(void) |
1da177e4 | 830 | { |
dd4d9fec FF |
831 | char *command_line; |
832 | char *after_dashes; | |
033ab7f8 | 833 | |
d4311ff1 | 834 | set_task_stack_end_magic(&init_task); |
73839c5b | 835 | smp_setup_processor_id(); |
3ac7fe5a | 836 | debug_objects_early_init(); |
42059429 | 837 | |
ddbcc7e8 | 838 | cgroup_init_early(); |
fbb9ce95 IM |
839 | |
840 | local_irq_disable(); | |
2ce802f6 | 841 | early_boot_irqs_disabled = true; |
fbb9ce95 | 842 | |
1b3b3b49 VK |
843 | /* |
844 | * Interrupts are still disabled. Do necessary setups, then | |
845 | * enable them. | |
846 | */ | |
44fd2299 | 847 | boot_cpu_init(); |
1da177e4 | 848 | page_address_init(); |
ea676e84 | 849 | pr_notice("%s", linux_banner); |
e6b1db98 | 850 | early_security_init(); |
1da177e4 | 851 | setup_arch(&command_line); |
7495e092 | 852 | setup_boot_config(command_line); |
30d7e0d4 | 853 | setup_command_line(command_line); |
e0982e90 | 854 | setup_nr_cpu_ids(); |
d6647bdf | 855 | setup_per_cpu_areas(); |
44fd2299 | 856 | smp_prepare_boot_cpu(); /* arch-specific boot-cpu hooks */ |
b5b1404d | 857 | boot_cpu_hotplug_init(); |
1da177e4 | 858 | |
72675e13 | 859 | build_all_zonelists(NULL); |
83b519e8 PE |
860 | page_alloc_init(); |
861 | ||
51887d03 | 862 | pr_notice("Kernel command line: %s\n", saved_command_line); |
6041186a DW |
863 | /* parameters may set static keys */ |
864 | jump_label_init(); | |
83b519e8 | 865 | parse_early_param(); |
51e158c1 RR |
866 | after_dashes = parse_args("Booting kernel", |
867 | static_command_line, __start___param, | |
868 | __stop___param - __start___param, | |
ecc86170 | 869 | -1, -1, NULL, &unknown_bootoption); |
3438cf54 | 870 | if (!IS_ERR_OR_NULL(after_dashes)) |
51e158c1 | 871 | parse_args("Setting init args", after_dashes, NULL, 0, -1, -1, |
ecc86170 | 872 | NULL, set_init_arg); |
13199162 MH |
873 | if (extra_init_args) |
874 | parse_args("Setting extra init args", extra_init_args, | |
875 | NULL, 0, -1, -1, NULL, set_init_arg); | |
97ce2c88 | 876 | |
83b519e8 PE |
877 | /* |
878 | * These use large bootmem allocations and must precede | |
879 | * kmem_cache_init() | |
880 | */ | |
162a7e75 | 881 | setup_log_buf(0); |
83b519e8 PE |
882 | vfs_caches_init_early(); |
883 | sort_main_extable(); | |
884 | trap_init(); | |
444f478f | 885 | mm_init(); |
de03c72c | 886 | |
f631718d SRV |
887 | ftrace_init(); |
888 | ||
e725c731 SRV |
889 | /* trace_printk can be enabled here */ |
890 | early_trace_init(); | |
891 | ||
1da177e4 LT |
892 | /* |
893 | * Set up the scheduler prior starting any interrupts (such as the | |
894 | * timer interrupt). Full topology setup happens at smp_init() | |
895 | * time - but meanwhile we still have a functioning scheduler. | |
896 | */ | |
897 | sched_init(); | |
898 | /* | |
899 | * Disable preemption - early bootup scheduling is extremely | |
900 | * fragile until we cpu_idle() for the first time. | |
901 | */ | |
902 | preempt_disable(); | |
dd4d9fec FF |
903 | if (WARN(!irqs_disabled(), |
904 | "Interrupts were enabled *very* early, fixing it\n")) | |
c4a68306 | 905 | local_irq_disable(); |
0a835c4f | 906 | radix_tree_init(); |
3347fa09 | 907 | |
7d229c66 TS |
908 | /* |
909 | * Set up housekeeping before setting up workqueues to allow the unbound | |
910 | * workqueue to take non-housekeeping into account. | |
911 | */ | |
912 | housekeeping_init(); | |
913 | ||
3347fa09 TH |
914 | /* |
915 | * Allow workqueue creation and work item queueing/cancelling | |
916 | * early. Work item execution depends on kthreads and starts after | |
917 | * workqueue_init(). | |
918 | */ | |
919 | workqueue_init_early(); | |
920 | ||
1da177e4 | 921 | rcu_init(); |
5f893b26 | 922 | |
e725c731 | 923 | /* Trace events are available after this */ |
5f893b26 SRRH |
924 | trace_init(); |
925 | ||
4e37958d SRV |
926 | if (initcall_debug) |
927 | initcall_debug_enable(); | |
928 | ||
65f382fd | 929 | context_tracking_init(); |
0b8f1efa YL |
930 | /* init some links before init_ISA_irqs() */ |
931 | early_irq_init(); | |
1da177e4 | 932 | init_IRQ(); |
ad2b1353 | 933 | tick_init(); |
d6dd50e0 | 934 | rcu_init_nohz(); |
1da177e4 | 935 | init_timers(); |
c0a31329 | 936 | hrtimers_init(); |
1da177e4 | 937 | softirq_init(); |
ad596171 | 938 | timekeeping_init(); |
d5553523 KC |
939 | |
940 | /* | |
941 | * For best initial stack canary entropy, prepare it after: | |
942 | * - setup_arch() for any UEFI RNG entropy and boot cmdline access | |
943 | * - timekeeping_init() for ktime entropy used in rand_initialize() | |
944 | * - rand_initialize() to get any arch-specific entropy like RDRAND | |
945 | * - add_latent_entropy() to get any latent entropy | |
946 | * - adding command line entropy | |
947 | */ | |
948 | rand_initialize(); | |
949 | add_latent_entropy(); | |
950 | add_device_randomness(command_line, strlen(command_line)); | |
951 | boot_init_stack_canary(); | |
952 | ||
88fecaa2 | 953 | time_init(); |
9e630205 | 954 | perf_event_init(); |
93e02814 | 955 | profile_init(); |
d8ad7d11 | 956 | call_function_init(); |
f91eb62f | 957 | WARN(!irqs_disabled(), "Interrupts were enabled early\n"); |
c3bc8fd6 | 958 | |
2ce802f6 | 959 | early_boot_irqs_disabled = false; |
93e02814 | 960 | local_irq_enable(); |
dcce284a | 961 | |
7e85ee0c | 962 | kmem_cache_init_late(); |
1da177e4 LT |
963 | |
964 | /* | |
965 | * HACK ALERT! This is early. We're enabling the console before | |
966 | * we've done PCI setups etc, and console_init() must be aware of | |
967 | * this. But we do want output early, in case something goes wrong. | |
968 | */ | |
969 | console_init(); | |
970 | if (panic_later) | |
499a4584 TH |
971 | panic("Too many boot %s vars at `%s'", panic_later, |
972 | panic_param); | |
fbb9ce95 | 973 | |
c3bc8fd6 | 974 | lockdep_init(); |
fbb9ce95 | 975 | |
9a11b49a IM |
976 | /* |
977 | * Need to run this when irqs are enabled, because it wants | |
978 | * to self-test [hard/soft]-irqs on/off lock inversion bugs | |
979 | * too: | |
980 | */ | |
981 | locking_selftest(); | |
982 | ||
c7753208 TL |
983 | /* |
984 | * This needs to be called before any devices perform DMA | |
985 | * operations that might use the SWIOTLB bounce buffers. It will | |
986 | * mark the bounce buffers as decrypted so that their usage will | |
987 | * not cause "plain-text" data to be decrypted when accessed. | |
988 | */ | |
989 | mem_encrypt_init(); | |
990 | ||
1da177e4 LT |
991 | #ifdef CONFIG_BLK_DEV_INITRD |
992 | if (initrd_start && !initrd_below_start_ok && | |
bd673c7c | 993 | page_to_pfn(virt_to_page((void *)initrd_start)) < min_low_pfn) { |
ea676e84 | 994 | pr_crit("initrd overwritten (0x%08lx < 0x%08lx) - disabling it.\n", |
bd673c7c GU |
995 | page_to_pfn(virt_to_page((void *)initrd_start)), |
996 | min_low_pfn); | |
1da177e4 LT |
997 | initrd_start = 0; |
998 | } | |
999 | #endif | |
e7c8d5c9 | 1000 | setup_per_cpu_pageset(); |
1da177e4 | 1001 | numa_policy_init(); |
9c71206d | 1002 | acpi_early_init(); |
1da177e4 LT |
1003 | if (late_time_init) |
1004 | late_time_init(); | |
857baa87 | 1005 | sched_clock_init(); |
1da177e4 | 1006 | calibrate_delay(); |
95846ecf | 1007 | pid_idr_init(); |
1da177e4 | 1008 | anon_vma_init(); |
11520e5e | 1009 | #ifdef CONFIG_X86 |
83e68189 | 1010 | if (efi_enabled(EFI_RUNTIME_SERVICES)) |
11520e5e LT |
1011 | efi_enter_virtual_mode(); |
1012 | #endif | |
b235beea | 1013 | thread_stack_cache_init(); |
d84f4f99 | 1014 | cred_init(); |
ff691f6e | 1015 | fork_init(); |
1da177e4 | 1016 | proc_caches_init(); |
3ea056c5 | 1017 | uts_ns_init(); |
1da177e4 | 1018 | buffer_init(); |
1da177e4 LT |
1019 | key_init(); |
1020 | security_init(); | |
0b4b3827 | 1021 | dbg_late_init(); |
4248b0da | 1022 | vfs_caches_init(); |
62906027 | 1023 | pagecache_init(); |
1da177e4 | 1024 | signals_init(); |
09652320 | 1025 | seq_file_init(); |
1da177e4 | 1026 | proc_root_init(); |
e149ed2b | 1027 | nsfs_init(); |
1da177e4 | 1028 | cpuset_init(); |
695df213 | 1029 | cgroup_init(); |
c757249a | 1030 | taskstats_init_early(); |
ca74e92b | 1031 | delayacct_init(); |
1da177e4 | 1032 | |
4fc19708 | 1033 | poking_init(); |
1da177e4 LT |
1034 | check_bugs(); |
1035 | ||
b064a8fa | 1036 | acpi_subsystem_init(); |
e7ff3a47 | 1037 | arch_post_acpi_subsys_init(); |
6ae6996a | 1038 | sfi_init_late(); |
1da177e4 LT |
1039 | |
1040 | /* Do the rest non-__init'ed, we're now alive */ | |
53c99bd6 | 1041 | arch_call_rest_init(); |
a9a3ed1e BP |
1042 | |
1043 | prevent_tail_call_optimization(); | |
1da177e4 LT |
1044 | } |
1045 | ||
b99b87f7 PO |
1046 | /* Call all constructor functions linked into the kernel. */ |
1047 | static void __init do_ctors(void) | |
1048 | { | |
1049 | #ifdef CONFIG_CONSTRUCTORS | |
196a15b4 | 1050 | ctor_fn_t *fn = (ctor_fn_t *) __ctors_start; |
b99b87f7 | 1051 | |
196a15b4 HS |
1052 | for (; fn < (ctor_fn_t *) __ctors_end; fn++) |
1053 | (*fn)(); | |
b99b87f7 PO |
1054 | #endif |
1055 | } | |
1056 | ||
7b0b73d7 PB |
1057 | #ifdef CONFIG_KALLSYMS |
1058 | struct blacklist_entry { | |
1059 | struct list_head next; | |
1060 | char *buf; | |
1061 | }; | |
1062 | ||
1063 | static __initdata_or_module LIST_HEAD(blacklisted_initcalls); | |
1064 | ||
1065 | static int __init initcall_blacklist(char *str) | |
1066 | { | |
1067 | char *str_entry; | |
1068 | struct blacklist_entry *entry; | |
1069 | ||
1070 | /* str argument is a comma-separated list of functions */ | |
1071 | do { | |
1072 | str_entry = strsep(&str, ","); | |
1073 | if (str_entry) { | |
1074 | pr_debug("blacklisting initcall %s\n", str_entry); | |
7e1c4e27 MR |
1075 | entry = memblock_alloc(sizeof(*entry), |
1076 | SMP_CACHE_BYTES); | |
f5c7310a MR |
1077 | if (!entry) |
1078 | panic("%s: Failed to allocate %zu bytes\n", | |
1079 | __func__, sizeof(*entry)); | |
7e1c4e27 MR |
1080 | entry->buf = memblock_alloc(strlen(str_entry) + 1, |
1081 | SMP_CACHE_BYTES); | |
f5c7310a MR |
1082 | if (!entry->buf) |
1083 | panic("%s: Failed to allocate %zu bytes\n", | |
1084 | __func__, strlen(str_entry) + 1); | |
7b0b73d7 PB |
1085 | strcpy(entry->buf, str_entry); |
1086 | list_add(&entry->next, &blacklisted_initcalls); | |
1087 | } | |
1088 | } while (str_entry); | |
1089 | ||
1090 | return 0; | |
1091 | } | |
1092 | ||
1093 | static bool __init_or_module initcall_blacklisted(initcall_t fn) | |
1094 | { | |
7b0b73d7 | 1095 | struct blacklist_entry *entry; |
c8cdd2be | 1096 | char fn_name[KSYM_SYMBOL_LEN]; |
0fd5ed8d | 1097 | unsigned long addr; |
7b0b73d7 | 1098 | |
c8cdd2be | 1099 | if (list_empty(&blacklisted_initcalls)) |
7b0b73d7 PB |
1100 | return false; |
1101 | ||
0fd5ed8d RV |
1102 | addr = (unsigned long) dereference_function_descriptor(fn); |
1103 | sprint_symbol_no_offset(fn_name, addr); | |
c8cdd2be | 1104 | |
841c06d7 PB |
1105 | /* |
1106 | * fn will be "function_name [module_name]" where [module_name] is not | |
1107 | * displayed for built-in init functions. Strip off the [module_name]. | |
1108 | */ | |
1109 | strreplace(fn_name, ' ', '\0'); | |
1110 | ||
e6fd1fb3 | 1111 | list_for_each_entry(entry, &blacklisted_initcalls, next) { |
7b0b73d7 PB |
1112 | if (!strcmp(fn_name, entry->buf)) { |
1113 | pr_debug("initcall %s blacklisted\n", fn_name); | |
7b0b73d7 PB |
1114 | return true; |
1115 | } | |
1116 | } | |
1117 | ||
7b0b73d7 PB |
1118 | return false; |
1119 | } | |
1120 | #else | |
1121 | static int __init initcall_blacklist(char *str) | |
1122 | { | |
1123 | pr_warn("initcall_blacklist requires CONFIG_KALLSYMS\n"); | |
1124 | return 0; | |
1125 | } | |
1126 | ||
1127 | static bool __init_or_module initcall_blacklisted(initcall_t fn) | |
1128 | { | |
1129 | return false; | |
1130 | } | |
1131 | #endif | |
1132 | __setup("initcall_blacklist=", initcall_blacklist); | |
1133 | ||
4e37958d SRV |
1134 | static __init_or_module void |
1135 | trace_initcall_start_cb(void *data, initcall_t fn) | |
1da177e4 | 1136 | { |
4e37958d | 1137 | ktime_t *calltime = (ktime_t *)data; |
1da177e4 | 1138 | |
d75f773c | 1139 | printk(KERN_DEBUG "calling %pS @ %i\n", fn, task_pid_nr(current)); |
4e37958d SRV |
1140 | *calltime = ktime_get(); |
1141 | } | |
1142 | ||
1143 | static __init_or_module void | |
1144 | trace_initcall_finish_cb(void *data, initcall_t fn, int ret) | |
1145 | { | |
1146 | ktime_t *calltime = (ktime_t *)data; | |
1147 | ktime_t delta, rettime; | |
1148 | unsigned long long duration; | |
1149 | ||
22c5c03b | 1150 | rettime = ktime_get(); |
4e37958d | 1151 | delta = ktime_sub(rettime, *calltime); |
22c5c03b | 1152 | duration = (unsigned long long) ktime_to_ns(delta) >> 10; |
d75f773c | 1153 | printk(KERN_DEBUG "initcall %pS returned %d after %lld usecs\n", |
ea676e84 | 1154 | fn, ret, duration); |
4e37958d | 1155 | } |
1da177e4 | 1156 | |
4e37958d SRV |
1157 | static ktime_t initcall_calltime; |
1158 | ||
b0dc52f1 | 1159 | #ifdef TRACEPOINTS_ENABLED |
4e37958d SRV |
1160 | static void __init initcall_debug_enable(void) |
1161 | { | |
1162 | int ret; | |
1163 | ||
1164 | ret = register_trace_initcall_start(trace_initcall_start_cb, | |
1165 | &initcall_calltime); | |
1166 | ret |= register_trace_initcall_finish(trace_initcall_finish_cb, | |
1167 | &initcall_calltime); | |
1168 | WARN(ret, "Failed to register initcall tracepoints\n"); | |
22c5c03b | 1169 | } |
b0dc52f1 SRV |
1170 | # define do_trace_initcall_start trace_initcall_start |
1171 | # define do_trace_initcall_finish trace_initcall_finish | |
1172 | #else | |
1173 | static inline void do_trace_initcall_start(initcall_t fn) | |
1174 | { | |
1175 | if (!initcall_debug) | |
1176 | return; | |
1177 | trace_initcall_start_cb(&initcall_calltime, fn); | |
1178 | } | |
1179 | static inline void do_trace_initcall_finish(initcall_t fn, int ret) | |
1180 | { | |
1181 | if (!initcall_debug) | |
1182 | return; | |
1183 | trace_initcall_finish_cb(&initcall_calltime, fn, ret); | |
1184 | } | |
1185 | #endif /* !TRACEPOINTS_ENABLED */ | |
22c5c03b | 1186 | |
e4461271 | 1187 | int __init_or_module do_one_initcall(initcall_t fn) |
22c5c03b KW |
1188 | { |
1189 | int count = preempt_count(); | |
ff1c8fac | 1190 | char msgbuf[64]; |
4e37958d | 1191 | int ret; |
22c5c03b | 1192 | |
7b0b73d7 PB |
1193 | if (initcall_blacklisted(fn)) |
1194 | return -EPERM; | |
1195 | ||
b0dc52f1 | 1196 | do_trace_initcall_start(fn); |
4e37958d | 1197 | ret = fn(); |
b0dc52f1 | 1198 | do_trace_initcall_finish(fn, ret); |
8f0c45cd | 1199 | |
e0df154f | 1200 | msgbuf[0] = 0; |
e662e1cf | 1201 | |
e0df154f | 1202 | if (preempt_count() != count) { |
bf5d770b | 1203 | sprintf(msgbuf, "preemption imbalance "); |
4a2b4b22 | 1204 | preempt_count_set(count); |
1da177e4 | 1205 | } |
e0df154f | 1206 | if (irqs_disabled()) { |
a76bfd0d | 1207 | strlcat(msgbuf, "disabled interrupts ", sizeof(msgbuf)); |
e0df154f LT |
1208 | local_irq_enable(); |
1209 | } | |
d75f773c | 1210 | WARN(msgbuf[0], "initcall %pS returned with %s\n", fn, msgbuf); |
59f9415f | 1211 | |
38addce8 | 1212 | add_latent_entropy(); |
30dbb20e | 1213 | return ret; |
e0df154f LT |
1214 | } |
1215 | ||
1216 | ||
1b1eeca7 AB |
1217 | extern initcall_entry_t __initcall_start[]; |
1218 | extern initcall_entry_t __initcall0_start[]; | |
1219 | extern initcall_entry_t __initcall1_start[]; | |
1220 | extern initcall_entry_t __initcall2_start[]; | |
1221 | extern initcall_entry_t __initcall3_start[]; | |
1222 | extern initcall_entry_t __initcall4_start[]; | |
1223 | extern initcall_entry_t __initcall5_start[]; | |
1224 | extern initcall_entry_t __initcall6_start[]; | |
1225 | extern initcall_entry_t __initcall7_start[]; | |
1226 | extern initcall_entry_t __initcall_end[]; | |
1227 | ||
1228 | static initcall_entry_t *initcall_levels[] __initdata = { | |
026cee00 PM |
1229 | __initcall0_start, |
1230 | __initcall1_start, | |
1231 | __initcall2_start, | |
1232 | __initcall3_start, | |
1233 | __initcall4_start, | |
1234 | __initcall5_start, | |
1235 | __initcall6_start, | |
1236 | __initcall7_start, | |
1237 | __initcall_end, | |
1238 | }; | |
1239 | ||
96263d28 | 1240 | /* Keep these in sync with initcalls in include/linux/init.h */ |
7c8f7193 | 1241 | static const char *initcall_level_names[] __initdata = { |
a6fb6012 | 1242 | "pure", |
9fb48c74 JC |
1243 | "core", |
1244 | "postcore", | |
1245 | "arch", | |
1246 | "subsys", | |
1247 | "fs", | |
1248 | "device", | |
1249 | "late", | |
026cee00 PM |
1250 | }; |
1251 | ||
7e2762e1 AS |
1252 | static int __init ignore_unknown_bootoption(char *param, char *val, |
1253 | const char *unused, void *arg) | |
1254 | { | |
1255 | return 0; | |
1256 | } | |
1257 | ||
0068c92a | 1258 | static void __init do_initcall_level(int level, char *command_line) |
e0df154f | 1259 | { |
1b1eeca7 | 1260 | initcall_entry_t *fn; |
e0df154f | 1261 | |
026cee00 | 1262 | parse_args(initcall_level_names[level], |
0068c92a | 1263 | command_line, __start___param, |
026cee00 PM |
1264 | __stop___param - __start___param, |
1265 | level, level, | |
7e2762e1 | 1266 | NULL, ignore_unknown_bootoption); |
026cee00 | 1267 | |
4ee7c60d | 1268 | trace_initcall_level(initcall_level_names[level]); |
026cee00 | 1269 | for (fn = initcall_levels[level]; fn < initcall_levels[level+1]; fn++) |
1b1eeca7 | 1270 | do_one_initcall(initcall_from_entry(fn)); |
1da177e4 LT |
1271 | } |
1272 | ||
026cee00 PM |
1273 | static void __init do_initcalls(void) |
1274 | { | |
1275 | int level; | |
0068c92a MH |
1276 | size_t len = strlen(saved_command_line) + 1; |
1277 | char *command_line; | |
1278 | ||
1279 | command_line = kzalloc(len, GFP_KERNEL); | |
1280 | if (!command_line) | |
1281 | panic("%s: Failed to allocate %zu bytes\n", __func__, len); | |
1282 | ||
1283 | for (level = 0; level < ARRAY_SIZE(initcall_levels) - 1; level++) { | |
1284 | /* Parser modifies command_line, restore it each time */ | |
1285 | strcpy(command_line, saved_command_line); | |
1286 | do_initcall_level(level, command_line); | |
1287 | } | |
026cee00 | 1288 | |
0068c92a | 1289 | kfree(command_line); |
026cee00 PM |
1290 | } |
1291 | ||
1da177e4 LT |
1292 | /* |
1293 | * Ok, the machine is now initialized. None of the devices | |
1294 | * have been touched yet, but the CPU subsystem is up and | |
1295 | * running, and memory and process management works. | |
1296 | * | |
1297 | * Now we can finally start doing some real work.. | |
1298 | */ | |
1299 | static void __init do_basic_setup(void) | |
1300 | { | |
759ee091 | 1301 | cpuset_init_smp(); |
1da177e4 | 1302 | driver_init(); |
b04c3afb | 1303 | init_irq_proc(); |
b99b87f7 | 1304 | do_ctors(); |
d5767c53 | 1305 | usermodehelper_enable(); |
b0f84374 | 1306 | do_initcalls(); |
1da177e4 LT |
1307 | } |
1308 | ||
7babe8db | 1309 | static void __init do_pre_smp_initcalls(void) |
c2147a50 | 1310 | { |
1b1eeca7 | 1311 | initcall_entry_t *fn; |
c2147a50 | 1312 | |
4ee7c60d | 1313 | trace_initcall_level("early"); |
026cee00 | 1314 | for (fn = __initcall_start; fn < __initcall0_start; fn++) |
1b1eeca7 | 1315 | do_one_initcall(initcall_from_entry(fn)); |
c2147a50 EGM |
1316 | } |
1317 | ||
a74fb73c | 1318 | static int run_init_process(const char *init_filename) |
1da177e4 | 1319 | { |
b88c50ac AS |
1320 | const char *const *p; |
1321 | ||
1da177e4 | 1322 | argv_init[0] = init_filename; |
3f5c15d8 | 1323 | pr_info("Run %s as init process\n", init_filename); |
b88c50ac AS |
1324 | pr_debug(" with arguments:\n"); |
1325 | for (p = argv_init; *p; p++) | |
1326 | pr_debug(" %s\n", *p); | |
1327 | pr_debug(" with environment:\n"); | |
1328 | for (p = envp_init; *p; p++) | |
1329 | pr_debug(" %s\n", *p); | |
c4ad8f98 | 1330 | return do_execve(getname_kernel(init_filename), |
ae903caa AV |
1331 | (const char __user *const __user *)argv_init, |
1332 | (const char __user *const __user *)envp_init); | |
1da177e4 LT |
1333 | } |
1334 | ||
ba24762b MO |
1335 | static int try_to_run_init_process(const char *init_filename) |
1336 | { | |
1337 | int ret; | |
1338 | ||
1339 | ret = run_init_process(init_filename); | |
1340 | ||
1341 | if (ret && ret != -ENOENT) { | |
1342 | pr_err("Starting init: %s exists but couldn't execute it (error %d)\n", | |
1343 | init_filename, ret); | |
1344 | } | |
1345 | ||
1346 | return ret; | |
1347 | } | |
1348 | ||
f80b0c90 | 1349 | static noinline void __init kernel_init_freeable(void); |
d6b21238 | 1350 | |
0f5bf6d0 | 1351 | #if defined(CONFIG_STRICT_KERNEL_RWX) || defined(CONFIG_STRICT_MODULE_RWX) |
39290b38 | 1352 | bool rodata_enabled __ro_after_init = true; |
d2aa1aca KC |
1353 | static int __init set_debug_rodata(char *str) |
1354 | { | |
1355 | return strtobool(str, &rodata_enabled); | |
1356 | } | |
1357 | __setup("rodata=", set_debug_rodata); | |
39290b38 | 1358 | #endif |
d2aa1aca | 1359 | |
0f5bf6d0 | 1360 | #ifdef CONFIG_STRICT_KERNEL_RWX |
d2aa1aca KC |
1361 | static void mark_readonly(void) |
1362 | { | |
2959a5f7 | 1363 | if (rodata_enabled) { |
ae646f0b | 1364 | /* |
ba180314 PM |
1365 | * load_module() results in W+X mappings, which are cleaned |
1366 | * up with call_rcu(). Let's make sure that queued work is | |
ae646f0b JH |
1367 | * flushed so that we don't hit false positives looking for |
1368 | * insecure pages which are W+X. | |
1369 | */ | |
ba180314 | 1370 | rcu_barrier(); |
d2aa1aca | 1371 | mark_rodata_ro(); |
2959a5f7 JP |
1372 | rodata_test(); |
1373 | } else | |
d2aa1aca KC |
1374 | pr_info("Kernel memory protection disabled.\n"); |
1375 | } | |
f596ded1 CL |
1376 | #elif defined(CONFIG_ARCH_HAS_STRICT_KERNEL_RWX) |
1377 | static inline void mark_readonly(void) | |
1378 | { | |
1379 | pr_warn("Kernel memory protection not selected by kernel config.\n"); | |
1380 | } | |
d2aa1aca KC |
1381 | #else |
1382 | static inline void mark_readonly(void) | |
1383 | { | |
1384 | pr_warn("This architecture does not have kernel memory protection.\n"); | |
1385 | } | |
1386 | #endif | |
1387 | ||
997aef68 MR |
1388 | void __weak free_initmem(void) |
1389 | { | |
f4039999 | 1390 | free_initmem_default(POISON_FREE_INITMEM); |
997aef68 MR |
1391 | } |
1392 | ||
d6b21238 | 1393 | static int __ref kernel_init(void *unused) |
ee5bfa64 | 1394 | { |
ba24762b MO |
1395 | int ret; |
1396 | ||
d6b21238 | 1397 | kernel_init_freeable(); |
22a9d645 AV |
1398 | /* need to finish all async __init code before freeing the memory */ |
1399 | async_synchronize_full(); | |
b80f0f6c | 1400 | ftrace_free_init_mem(); |
ee5bfa64 | 1401 | free_initmem(); |
d2aa1aca | 1402 | mark_readonly(); |
b976690f JR |
1403 | |
1404 | /* | |
1405 | * Kernel mappings are now finalized - update the userspace page-table | |
1406 | * to finalize PTI. | |
1407 | */ | |
1408 | pti_finalize(); | |
1409 | ||
ee5bfa64 VG |
1410 | system_state = SYSTEM_RUNNING; |
1411 | numa_default_policy(); | |
1412 | ||
967dcb8f PM |
1413 | rcu_end_inkernel_boot(); |
1414 | ||
ee5bfa64 | 1415 | if (ramdisk_execute_command) { |
ba24762b MO |
1416 | ret = run_init_process(ramdisk_execute_command); |
1417 | if (!ret) | |
a74fb73c | 1418 | return 0; |
ba24762b MO |
1419 | pr_err("Failed to execute %s (error %d)\n", |
1420 | ramdisk_execute_command, ret); | |
ee5bfa64 VG |
1421 | } |
1422 | ||
1423 | /* | |
1424 | * We try each of these until one succeeds. | |
1425 | * | |
1426 | * The Bourne shell can be used instead of init if we are | |
1427 | * trying to recover a really broken machine. | |
1428 | */ | |
1429 | if (execute_command) { | |
ba24762b MO |
1430 | ret = run_init_process(execute_command); |
1431 | if (!ret) | |
a74fb73c | 1432 | return 0; |
6ef4536e AL |
1433 | panic("Requested init %s failed (error %d).", |
1434 | execute_command, ret); | |
ee5bfa64 | 1435 | } |
ba24762b MO |
1436 | if (!try_to_run_init_process("/sbin/init") || |
1437 | !try_to_run_init_process("/etc/init") || | |
1438 | !try_to_run_init_process("/bin/init") || | |
1439 | !try_to_run_init_process("/bin/sh")) | |
a74fb73c | 1440 | return 0; |
ee5bfa64 | 1441 | |
ba24762b | 1442 | panic("No working init found. Try passing init= option to kernel. " |
8c27ceff | 1443 | "See Linux Documentation/admin-guide/init.rst for guidance."); |
ee5bfa64 VG |
1444 | } |
1445 | ||
b49a733d DB |
1446 | void console_on_rootfs(void) |
1447 | { | |
74f1a299 DB |
1448 | /* Open the /dev/console as stdin, this should never fail */ |
1449 | if (ksys_open((const char __user *) "/dev/console", O_RDWR, 0) < 0) | |
1450 | pr_err("Warning: unable to open an initial console.\n"); | |
b49a733d | 1451 | |
74f1a299 DB |
1452 | /* create stdout/stderr */ |
1453 | (void) ksys_dup(0); | |
1454 | (void) ksys_dup(0); | |
b49a733d DB |
1455 | } |
1456 | ||
f80b0c90 | 1457 | static noinline void __init kernel_init_freeable(void) |
1da177e4 | 1458 | { |
b433c3d4 PZ |
1459 | /* |
1460 | * Wait until kthreadd is all set-up. | |
1461 | */ | |
1462 | wait_for_completion(&kthreadd_done); | |
31a67102 LT |
1463 | |
1464 | /* Now the scheduler is fully set up and can do blocking allocations */ | |
1465 | gfp_allowed_mask = __GFP_BITS_MASK; | |
1466 | ||
58568d2a MX |
1467 | /* |
1468 | * init can allocate pages on any node | |
1469 | */ | |
3c466d46 | 1470 | set_mems_allowed(node_states[N_MEMORY]); |
1da177e4 | 1471 | |
9ec52099 CLG |
1472 | cad_pid = task_pid(current); |
1473 | ||
ca74a6f8 | 1474 | smp_prepare_cpus(setup_max_cpus); |
1da177e4 | 1475 | |
3347fa09 TH |
1476 | workqueue_init(); |
1477 | ||
597b7305 MH |
1478 | init_mm_internals(); |
1479 | ||
1da177e4 | 1480 | do_pre_smp_initcalls(); |
004417a6 | 1481 | lockup_detector_init(); |
1da177e4 | 1482 | |
1da177e4 LT |
1483 | smp_init(); |
1484 | sched_init_smp(); | |
1485 | ||
f1b192b1 | 1486 | padata_init(); |
0e1cc95b | 1487 | page_alloc_init_late(); |
2f1ee091 QC |
1488 | /* Initialize page ext after all struct pages are initialized. */ |
1489 | page_ext_init(); | |
0e1cc95b | 1490 | |
1da177e4 LT |
1491 | do_basic_setup(); |
1492 | ||
b49a733d | 1493 | console_on_rootfs(); |
2bd3a997 | 1494 | |
1da177e4 LT |
1495 | /* |
1496 | * check if there is an early userspace init. If yes, let it do all | |
1497 | * the work | |
1498 | */ | |
ffdfc409 OJ |
1499 | |
1500 | if (!ramdisk_execute_command) | |
1501 | ramdisk_execute_command = "/init"; | |
1502 | ||
cbfe20f5 DB |
1503 | if (ksys_access((const char __user *) |
1504 | ramdisk_execute_command, 0) != 0) { | |
ffdfc409 | 1505 | ramdisk_execute_command = NULL; |
1da177e4 | 1506 | prepare_namespace(); |
ffdfc409 | 1507 | } |
1da177e4 LT |
1508 | |
1509 | /* | |
1510 | * Ok, we have completed the initial bootup, and | |
1511 | * we're essentially up and running. Get rid of the | |
1512 | * initmem segments and start the user-mode stuff.. | |
c9cd2ce2 DK |
1513 | * |
1514 | * rootfs is available now, try loading the public keys | |
1515 | * and default modules | |
1da177e4 | 1516 | */ |
bb813f4c | 1517 | |
c9cd2ce2 | 1518 | integrity_load_keys(); |
1da177e4 | 1519 | } |