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1 | /* | |
2 | * linux/init/main.c | |
3 | * | |
4 | * Copyright (C) 1991, 1992 Linus Torvalds | |
5 | * | |
6 | * GK 2/5/95 - Changed to support mounting root fs via NFS | |
7 | * Added initrd & change_root: Werner Almesberger & Hans Lermen, Feb '96 | |
8 | * Moan early if gcc is old, avoiding bogus kernels - Paul Gortmaker, May '96 | |
9 | * Simplified starting of init: Michael A. Griffith <grif@acm.org> | |
10 | */ | |
11 | ||
12 | #define DEBUG /* Enable initcall_debug */ | |
13 | ||
14 | #include <linux/types.h> | |
15 | #include <linux/module.h> | |
16 | #include <linux/proc_fs.h> | |
17 | #include <linux/kernel.h> | |
18 | #include <linux/syscalls.h> | |
19 | #include <linux/stackprotector.h> | |
20 | #include <linux/string.h> | |
21 | #include <linux/ctype.h> | |
22 | #include <linux/delay.h> | |
23 | #include <linux/ioport.h> | |
24 | #include <linux/init.h> | |
25 | #include <linux/initrd.h> | |
26 | #include <linux/bootmem.h> | |
27 | #include <linux/acpi.h> | |
28 | #include <linux/tty.h> | |
29 | #include <linux/percpu.h> | |
30 | #include <linux/kmod.h> | |
31 | #include <linux/vmalloc.h> | |
32 | #include <linux/kernel_stat.h> | |
33 | #include <linux/start_kernel.h> | |
34 | #include <linux/security.h> | |
35 | #include <linux/smp.h> | |
36 | #include <linux/profile.h> | |
37 | #include <linux/rcupdate.h> | |
38 | #include <linux/moduleparam.h> | |
39 | #include <linux/kallsyms.h> | |
40 | #include <linux/writeback.h> | |
41 | #include <linux/cpu.h> | |
42 | #include <linux/cpuset.h> | |
43 | #include <linux/cgroup.h> | |
44 | #include <linux/efi.h> | |
45 | #include <linux/tick.h> | |
46 | #include <linux/interrupt.h> | |
47 | #include <linux/taskstats_kern.h> | |
48 | #include <linux/delayacct.h> | |
49 | #include <linux/unistd.h> | |
50 | #include <linux/rmap.h> | |
51 | #include <linux/mempolicy.h> | |
52 | #include <linux/key.h> | |
53 | #include <linux/buffer_head.h> | |
54 | #include <linux/page_ext.h> | |
55 | #include <linux/debug_locks.h> | |
56 | #include <linux/debugobjects.h> | |
57 | #include <linux/lockdep.h> | |
58 | #include <linux/kmemleak.h> | |
59 | #include <linux/pid_namespace.h> | |
60 | #include <linux/device.h> | |
61 | #include <linux/kthread.h> | |
62 | #include <linux/sched.h> | |
63 | #include <linux/signal.h> | |
64 | #include <linux/idr.h> | |
65 | #include <linux/kgdb.h> | |
66 | #include <linux/ftrace.h> | |
67 | #include <linux/async.h> | |
68 | #include <linux/kmemcheck.h> | |
69 | #include <linux/sfi.h> | |
70 | #include <linux/shmem_fs.h> | |
71 | #include <linux/slab.h> | |
72 | #include <linux/perf_event.h> | |
73 | #include <linux/file.h> | |
74 | #include <linux/ptrace.h> | |
75 | #include <linux/blkdev.h> | |
76 | #include <linux/elevator.h> | |
77 | #include <linux/sched_clock.h> | |
78 | #include <linux/context_tracking.h> | |
79 | #include <linux/random.h> | |
80 | #include <linux/list.h> | |
81 | #include <linux/integrity.h> | |
82 | #include <linux/proc_ns.h> | |
83 | #include <linux/io.h> | |
84 | #include <linux/cache.h> | |
85 | ||
86 | #include <asm/io.h> | |
87 | #include <asm/bugs.h> | |
88 | #include <asm/setup.h> | |
89 | #include <asm/sections.h> | |
90 | #include <asm/cacheflush.h> | |
91 | ||
92 | static int kernel_init(void *); | |
93 | ||
94 | extern void init_IRQ(void); | |
95 | extern void fork_init(void); | |
96 | extern void radix_tree_init(void); | |
97 | ||
98 | /* | |
99 | * Debug helper: via this flag we know that we are in 'early bootup code' | |
100 | * where only the boot processor is running with IRQ disabled. This means | |
101 | * two things - IRQ must not be enabled before the flag is cleared and some | |
102 | * operations which are not allowed with IRQ disabled are allowed while the | |
103 | * flag is set. | |
104 | */ | |
105 | bool early_boot_irqs_disabled __read_mostly; | |
106 | ||
107 | enum system_states system_state __read_mostly; | |
108 | EXPORT_SYMBOL(system_state); | |
109 | ||
110 | /* | |
111 | * Boot command-line arguments | |
112 | */ | |
113 | #define MAX_INIT_ARGS CONFIG_INIT_ENV_ARG_LIMIT | |
114 | #define MAX_INIT_ENVS CONFIG_INIT_ENV_ARG_LIMIT | |
115 | ||
116 | extern void time_init(void); | |
117 | /* Default late time init is NULL. archs can override this later. */ | |
118 | void (*__initdata late_time_init)(void); | |
119 | ||
120 | /* Untouched command line saved by arch-specific code. */ | |
121 | char __initdata boot_command_line[COMMAND_LINE_SIZE]; | |
122 | /* Untouched saved command line (eg. for /proc) */ | |
123 | char *saved_command_line; | |
124 | /* Command line for parameter parsing */ | |
125 | static char *static_command_line; | |
126 | /* Command line for per-initcall parameter parsing */ | |
127 | static char *initcall_command_line; | |
128 | ||
129 | static char *execute_command; | |
130 | static char *ramdisk_execute_command; | |
131 | ||
132 | /* | |
133 | * Used to generate warnings if static_key manipulation functions are used | |
134 | * before jump_label_init is called. | |
135 | */ | |
136 | bool static_key_initialized __read_mostly; | |
137 | EXPORT_SYMBOL_GPL(static_key_initialized); | |
138 | ||
139 | /* | |
140 | * If set, this is an indication to the drivers that reset the underlying | |
141 | * device before going ahead with the initialization otherwise driver might | |
142 | * rely on the BIOS and skip the reset operation. | |
143 | * | |
144 | * This is useful if kernel is booting in an unreliable environment. | |
145 | * For ex. kdump situation where previous kernel has crashed, BIOS has been | |
146 | * skipped and devices will be in unknown state. | |
147 | */ | |
148 | unsigned int reset_devices; | |
149 | EXPORT_SYMBOL(reset_devices); | |
150 | ||
151 | static int __init set_reset_devices(char *str) | |
152 | { | |
153 | reset_devices = 1; | |
154 | return 1; | |
155 | } | |
156 | ||
157 | __setup("reset_devices", set_reset_devices); | |
158 | ||
159 | static const char *argv_init[MAX_INIT_ARGS+2] = { "init", NULL, }; | |
160 | const char *envp_init[MAX_INIT_ENVS+2] = { "HOME=/", "TERM=linux", NULL, }; | |
161 | static const char *panic_later, *panic_param; | |
162 | ||
163 | extern const struct obs_kernel_param __setup_start[], __setup_end[]; | |
164 | ||
165 | static bool __init obsolete_checksetup(char *line) | |
166 | { | |
167 | const struct obs_kernel_param *p; | |
168 | bool had_early_param = false; | |
169 | ||
170 | p = __setup_start; | |
171 | do { | |
172 | int n = strlen(p->str); | |
173 | if (parameqn(line, p->str, n)) { | |
174 | if (p->early) { | |
175 | /* Already done in parse_early_param? | |
176 | * (Needs exact match on param part). | |
177 | * Keep iterating, as we can have early | |
178 | * params and __setups of same names 8( */ | |
179 | if (line[n] == '\0' || line[n] == '=') | |
180 | had_early_param = true; | |
181 | } else if (!p->setup_func) { | |
182 | pr_warn("Parameter %s is obsolete, ignored\n", | |
183 | p->str); | |
184 | return true; | |
185 | } else if (p->setup_func(line + n)) | |
186 | return true; | |
187 | } | |
188 | p++; | |
189 | } while (p < __setup_end); | |
190 | ||
191 | return had_early_param; | |
192 | } | |
193 | ||
194 | /* | |
195 | * This should be approx 2 Bo*oMips to start (note initial shift), and will | |
196 | * still work even if initially too large, it will just take slightly longer | |
197 | */ | |
198 | unsigned long loops_per_jiffy = (1<<12); | |
199 | EXPORT_SYMBOL(loops_per_jiffy); | |
200 | ||
201 | static int __init debug_kernel(char *str) | |
202 | { | |
203 | console_loglevel = CONSOLE_LOGLEVEL_DEBUG; | |
204 | return 0; | |
205 | } | |
206 | ||
207 | static int __init quiet_kernel(char *str) | |
208 | { | |
209 | console_loglevel = CONSOLE_LOGLEVEL_QUIET; | |
210 | return 0; | |
211 | } | |
212 | ||
213 | early_param("debug", debug_kernel); | |
214 | early_param("quiet", quiet_kernel); | |
215 | ||
216 | static int __init loglevel(char *str) | |
217 | { | |
218 | int newlevel; | |
219 | ||
220 | /* | |
221 | * Only update loglevel value when a correct setting was passed, | |
222 | * to prevent blind crashes (when loglevel being set to 0) that | |
223 | * are quite hard to debug | |
224 | */ | |
225 | if (get_option(&str, &newlevel)) { | |
226 | console_loglevel = newlevel; | |
227 | return 0; | |
228 | } | |
229 | ||
230 | return -EINVAL; | |
231 | } | |
232 | ||
233 | early_param("loglevel", loglevel); | |
234 | ||
235 | /* Change NUL term back to "=", to make "param" the whole string. */ | |
236 | static int __init repair_env_string(char *param, char *val, | |
237 | const char *unused, void *arg) | |
238 | { | |
239 | if (val) { | |
240 | /* param=val or param="val"? */ | |
241 | if (val == param+strlen(param)+1) | |
242 | val[-1] = '='; | |
243 | else if (val == param+strlen(param)+2) { | |
244 | val[-2] = '='; | |
245 | memmove(val-1, val, strlen(val)+1); | |
246 | val--; | |
247 | } else | |
248 | BUG(); | |
249 | } | |
250 | return 0; | |
251 | } | |
252 | ||
253 | /* Anything after -- gets handed straight to init. */ | |
254 | static int __init set_init_arg(char *param, char *val, | |
255 | const char *unused, void *arg) | |
256 | { | |
257 | unsigned int i; | |
258 | ||
259 | if (panic_later) | |
260 | return 0; | |
261 | ||
262 | repair_env_string(param, val, unused, NULL); | |
263 | ||
264 | for (i = 0; argv_init[i]; i++) { | |
265 | if (i == MAX_INIT_ARGS) { | |
266 | panic_later = "init"; | |
267 | panic_param = param; | |
268 | return 0; | |
269 | } | |
270 | } | |
271 | argv_init[i] = param; | |
272 | return 0; | |
273 | } | |
274 | ||
275 | /* | |
276 | * Unknown boot options get handed to init, unless they look like | |
277 | * unused parameters (modprobe will find them in /proc/cmdline). | |
278 | */ | |
279 | static int __init unknown_bootoption(char *param, char *val, | |
280 | const char *unused, void *arg) | |
281 | { | |
282 | repair_env_string(param, val, unused, NULL); | |
283 | ||
284 | /* Handle obsolete-style parameters */ | |
285 | if (obsolete_checksetup(param)) | |
286 | return 0; | |
287 | ||
288 | /* Unused module parameter. */ | |
289 | if (strchr(param, '.') && (!val || strchr(param, '.') < val)) | |
290 | return 0; | |
291 | ||
292 | if (panic_later) | |
293 | return 0; | |
294 | ||
295 | if (val) { | |
296 | /* Environment option */ | |
297 | unsigned int i; | |
298 | for (i = 0; envp_init[i]; i++) { | |
299 | if (i == MAX_INIT_ENVS) { | |
300 | panic_later = "env"; | |
301 | panic_param = param; | |
302 | } | |
303 | if (!strncmp(param, envp_init[i], val - param)) | |
304 | break; | |
305 | } | |
306 | envp_init[i] = param; | |
307 | } else { | |
308 | /* Command line option */ | |
309 | unsigned int i; | |
310 | for (i = 0; argv_init[i]; i++) { | |
311 | if (i == MAX_INIT_ARGS) { | |
312 | panic_later = "init"; | |
313 | panic_param = param; | |
314 | } | |
315 | } | |
316 | argv_init[i] = param; | |
317 | } | |
318 | return 0; | |
319 | } | |
320 | ||
321 | static int __init init_setup(char *str) | |
322 | { | |
323 | unsigned int i; | |
324 | ||
325 | execute_command = str; | |
326 | /* | |
327 | * In case LILO is going to boot us with default command line, | |
328 | * it prepends "auto" before the whole cmdline which makes | |
329 | * the shell think it should execute a script with such name. | |
330 | * So we ignore all arguments entered _before_ init=... [MJ] | |
331 | */ | |
332 | for (i = 1; i < MAX_INIT_ARGS; i++) | |
333 | argv_init[i] = NULL; | |
334 | return 1; | |
335 | } | |
336 | __setup("init=", init_setup); | |
337 | ||
338 | static int __init rdinit_setup(char *str) | |
339 | { | |
340 | unsigned int i; | |
341 | ||
342 | ramdisk_execute_command = str; | |
343 | /* See "auto" comment in init_setup */ | |
344 | for (i = 1; i < MAX_INIT_ARGS; i++) | |
345 | argv_init[i] = NULL; | |
346 | return 1; | |
347 | } | |
348 | __setup("rdinit=", rdinit_setup); | |
349 | ||
350 | #ifndef CONFIG_SMP | |
351 | static const unsigned int setup_max_cpus = NR_CPUS; | |
352 | static inline void setup_nr_cpu_ids(void) { } | |
353 | static inline void smp_prepare_cpus(unsigned int maxcpus) { } | |
354 | #endif | |
355 | ||
356 | /* | |
357 | * We need to store the untouched command line for future reference. | |
358 | * We also need to store the touched command line since the parameter | |
359 | * parsing is performed in place, and we should allow a component to | |
360 | * store reference of name/value for future reference. | |
361 | */ | |
362 | static void __init setup_command_line(char *command_line) | |
363 | { | |
364 | saved_command_line = | |
365 | memblock_virt_alloc(strlen(boot_command_line) + 1, 0); | |
366 | initcall_command_line = | |
367 | memblock_virt_alloc(strlen(boot_command_line) + 1, 0); | |
368 | static_command_line = memblock_virt_alloc(strlen(command_line) + 1, 0); | |
369 | strcpy(saved_command_line, boot_command_line); | |
370 | strcpy(static_command_line, command_line); | |
371 | } | |
372 | ||
373 | /* | |
374 | * We need to finalize in a non-__init function or else race conditions | |
375 | * between the root thread and the init thread may cause start_kernel to | |
376 | * be reaped by free_initmem before the root thread has proceeded to | |
377 | * cpu_idle. | |
378 | * | |
379 | * gcc-3.4 accidentally inlines this function, so use noinline. | |
380 | */ | |
381 | ||
382 | static __initdata DECLARE_COMPLETION(kthreadd_done); | |
383 | ||
384 | static noinline void __ref rest_init(void) | |
385 | { | |
386 | int pid; | |
387 | ||
388 | rcu_scheduler_starting(); | |
389 | /* | |
390 | * We need to spawn init first so that it obtains pid 1, however | |
391 | * the init task will end up wanting to create kthreads, which, if | |
392 | * we schedule it before we create kthreadd, will OOPS. | |
393 | */ | |
394 | kernel_thread(kernel_init, NULL, CLONE_FS); | |
395 | numa_default_policy(); | |
396 | pid = kernel_thread(kthreadd, NULL, CLONE_FS | CLONE_FILES); | |
397 | rcu_read_lock(); | |
398 | kthreadd_task = find_task_by_pid_ns(pid, &init_pid_ns); | |
399 | rcu_read_unlock(); | |
400 | complete(&kthreadd_done); | |
401 | ||
402 | /* | |
403 | * The boot idle thread must execute schedule() | |
404 | * at least once to get things moving: | |
405 | */ | |
406 | init_idle_bootup_task(current); | |
407 | schedule_preempt_disabled(); | |
408 | /* Call into cpu_idle with preempt disabled */ | |
409 | cpu_startup_entry(CPUHP_ONLINE); | |
410 | } | |
411 | ||
412 | /* Check for early params. */ | |
413 | static int __init do_early_param(char *param, char *val, | |
414 | const char *unused, void *arg) | |
415 | { | |
416 | const struct obs_kernel_param *p; | |
417 | ||
418 | for (p = __setup_start; p < __setup_end; p++) { | |
419 | if ((p->early && parameq(param, p->str)) || | |
420 | (strcmp(param, "console") == 0 && | |
421 | strcmp(p->str, "earlycon") == 0) | |
422 | ) { | |
423 | if (p->setup_func(val) != 0) | |
424 | pr_warn("Malformed early option '%s'\n", param); | |
425 | } | |
426 | } | |
427 | /* We accept everything at this stage. */ | |
428 | return 0; | |
429 | } | |
430 | ||
431 | void __init parse_early_options(char *cmdline) | |
432 | { | |
433 | parse_args("early options", cmdline, NULL, 0, 0, 0, NULL, | |
434 | do_early_param); | |
435 | } | |
436 | ||
437 | /* Arch code calls this early on, or if not, just before other parsing. */ | |
438 | void __init parse_early_param(void) | |
439 | { | |
440 | static int done __initdata; | |
441 | static char tmp_cmdline[COMMAND_LINE_SIZE] __initdata; | |
442 | ||
443 | if (done) | |
444 | return; | |
445 | ||
446 | /* All fall through to do_early_param. */ | |
447 | strlcpy(tmp_cmdline, boot_command_line, COMMAND_LINE_SIZE); | |
448 | parse_early_options(tmp_cmdline); | |
449 | done = 1; | |
450 | } | |
451 | ||
452 | void __init __weak arch_post_acpi_subsys_init(void) { } | |
453 | ||
454 | void __init __weak smp_setup_processor_id(void) | |
455 | { | |
456 | } | |
457 | ||
458 | # if THREAD_SIZE >= PAGE_SIZE | |
459 | void __init __weak thread_stack_cache_init(void) | |
460 | { | |
461 | } | |
462 | #endif | |
463 | ||
464 | /* | |
465 | * Set up kernel memory allocators | |
466 | */ | |
467 | static void __init mm_init(void) | |
468 | { | |
469 | /* | |
470 | * page_ext requires contiguous pages, | |
471 | * bigger than MAX_ORDER unless SPARSEMEM. | |
472 | */ | |
473 | page_ext_init_flatmem(); | |
474 | mem_init(); | |
475 | kmem_cache_init(); | |
476 | percpu_init_late(); | |
477 | pgtable_init(); | |
478 | vmalloc_init(); | |
479 | ioremap_huge_init(); | |
480 | } | |
481 | ||
482 | asmlinkage __visible void __init start_kernel(void) | |
483 | { | |
484 | char *command_line; | |
485 | char *after_dashes; | |
486 | ||
487 | set_task_stack_end_magic(&init_task); | |
488 | smp_setup_processor_id(); | |
489 | debug_objects_early_init(); | |
490 | ||
491 | /* | |
492 | * Set up the the initial canary ASAP: | |
493 | */ | |
494 | boot_init_stack_canary(); | |
495 | ||
496 | cgroup_init_early(); | |
497 | ||
498 | local_irq_disable(); | |
499 | early_boot_irqs_disabled = true; | |
500 | ||
501 | /* | |
502 | * Interrupts are still disabled. Do necessary setups, then | |
503 | * enable them | |
504 | */ | |
505 | boot_cpu_init(); | |
506 | page_address_init(); | |
507 | pr_notice("%s", linux_banner); | |
508 | setup_arch(&command_line); | |
509 | mm_init_cpumask(&init_mm); | |
510 | setup_command_line(command_line); | |
511 | setup_nr_cpu_ids(); | |
512 | setup_per_cpu_areas(); | |
513 | boot_cpu_state_init(); | |
514 | smp_prepare_boot_cpu(); /* arch-specific boot-cpu hooks */ | |
515 | ||
516 | build_all_zonelists(NULL, NULL); | |
517 | page_alloc_init(); | |
518 | ||
519 | pr_notice("Kernel command line: %s\n", boot_command_line); | |
520 | parse_early_param(); | |
521 | after_dashes = parse_args("Booting kernel", | |
522 | static_command_line, __start___param, | |
523 | __stop___param - __start___param, | |
524 | -1, -1, NULL, &unknown_bootoption); | |
525 | if (!IS_ERR_OR_NULL(after_dashes)) | |
526 | parse_args("Setting init args", after_dashes, NULL, 0, -1, -1, | |
527 | NULL, set_init_arg); | |
528 | ||
529 | jump_label_init(); | |
530 | ||
531 | /* | |
532 | * These use large bootmem allocations and must precede | |
533 | * kmem_cache_init() | |
534 | */ | |
535 | setup_log_buf(0); | |
536 | pidhash_init(); | |
537 | vfs_caches_init_early(); | |
538 | sort_main_extable(); | |
539 | trap_init(); | |
540 | mm_init(); | |
541 | ||
542 | /* | |
543 | * Set up the scheduler prior starting any interrupts (such as the | |
544 | * timer interrupt). Full topology setup happens at smp_init() | |
545 | * time - but meanwhile we still have a functioning scheduler. | |
546 | */ | |
547 | sched_init(); | |
548 | /* | |
549 | * Disable preemption - early bootup scheduling is extremely | |
550 | * fragile until we cpu_idle() for the first time. | |
551 | */ | |
552 | preempt_disable(); | |
553 | if (WARN(!irqs_disabled(), | |
554 | "Interrupts were enabled *very* early, fixing it\n")) | |
555 | local_irq_disable(); | |
556 | idr_init_cache(); | |
557 | ||
558 | /* | |
559 | * Allow workqueue creation and work item queueing/cancelling | |
560 | * early. Work item execution depends on kthreads and starts after | |
561 | * workqueue_init(). | |
562 | */ | |
563 | workqueue_init_early(); | |
564 | ||
565 | rcu_init(); | |
566 | ||
567 | /* trace_printk() and trace points may be used after this */ | |
568 | trace_init(); | |
569 | ||
570 | context_tracking_init(); | |
571 | radix_tree_init(); | |
572 | /* init some links before init_ISA_irqs() */ | |
573 | early_irq_init(); | |
574 | init_IRQ(); | |
575 | tick_init(); | |
576 | rcu_init_nohz(); | |
577 | init_timers(); | |
578 | hrtimers_init(); | |
579 | softirq_init(); | |
580 | timekeeping_init(); | |
581 | time_init(); | |
582 | sched_clock_postinit(); | |
583 | printk_nmi_init(); | |
584 | perf_event_init(); | |
585 | profile_init(); | |
586 | call_function_init(); | |
587 | WARN(!irqs_disabled(), "Interrupts were enabled early\n"); | |
588 | early_boot_irqs_disabled = false; | |
589 | local_irq_enable(); | |
590 | ||
591 | kmem_cache_init_late(); | |
592 | ||
593 | /* | |
594 | * HACK ALERT! This is early. We're enabling the console before | |
595 | * we've done PCI setups etc, and console_init() must be aware of | |
596 | * this. But we do want output early, in case something goes wrong. | |
597 | */ | |
598 | console_init(); | |
599 | if (panic_later) | |
600 | panic("Too many boot %s vars at `%s'", panic_later, | |
601 | panic_param); | |
602 | ||
603 | lockdep_info(); | |
604 | ||
605 | /* | |
606 | * Need to run this when irqs are enabled, because it wants | |
607 | * to self-test [hard/soft]-irqs on/off lock inversion bugs | |
608 | * too: | |
609 | */ | |
610 | locking_selftest(); | |
611 | ||
612 | #ifdef CONFIG_BLK_DEV_INITRD | |
613 | if (initrd_start && !initrd_below_start_ok && | |
614 | page_to_pfn(virt_to_page((void *)initrd_start)) < min_low_pfn) { | |
615 | pr_crit("initrd overwritten (0x%08lx < 0x%08lx) - disabling it.\n", | |
616 | page_to_pfn(virt_to_page((void *)initrd_start)), | |
617 | min_low_pfn); | |
618 | initrd_start = 0; | |
619 | } | |
620 | #endif | |
621 | page_ext_init(); | |
622 | debug_objects_mem_init(); | |
623 | kmemleak_init(); | |
624 | setup_per_cpu_pageset(); | |
625 | numa_policy_init(); | |
626 | if (late_time_init) | |
627 | late_time_init(); | |
628 | sched_clock_init(); | |
629 | calibrate_delay(); | |
630 | pidmap_init(); | |
631 | anon_vma_init(); | |
632 | acpi_early_init(); | |
633 | #ifdef CONFIG_X86 | |
634 | if (efi_enabled(EFI_RUNTIME_SERVICES)) | |
635 | efi_enter_virtual_mode(); | |
636 | #endif | |
637 | #ifdef CONFIG_X86_ESPFIX64 | |
638 | /* Should be run before the first non-init thread is created */ | |
639 | init_espfix_bsp(); | |
640 | #endif | |
641 | thread_stack_cache_init(); | |
642 | cred_init(); | |
643 | fork_init(); | |
644 | proc_caches_init(); | |
645 | buffer_init(); | |
646 | key_init(); | |
647 | security_init(); | |
648 | dbg_late_init(); | |
649 | vfs_caches_init(); | |
650 | pagecache_init(); | |
651 | signals_init(); | |
652 | proc_root_init(); | |
653 | nsfs_init(); | |
654 | cpuset_init(); | |
655 | cgroup_init(); | |
656 | taskstats_init_early(); | |
657 | delayacct_init(); | |
658 | ||
659 | check_bugs(); | |
660 | ||
661 | acpi_subsystem_init(); | |
662 | arch_post_acpi_subsys_init(); | |
663 | sfi_init_late(); | |
664 | ||
665 | if (efi_enabled(EFI_RUNTIME_SERVICES)) { | |
666 | efi_late_init(); | |
667 | efi_free_boot_services(); | |
668 | } | |
669 | ||
670 | ftrace_init(); | |
671 | ||
672 | /* Do the rest non-__init'ed, we're now alive */ | |
673 | rest_init(); | |
674 | } | |
675 | ||
676 | /* Call all constructor functions linked into the kernel. */ | |
677 | static void __init do_ctors(void) | |
678 | { | |
679 | #ifdef CONFIG_CONSTRUCTORS | |
680 | ctor_fn_t *fn = (ctor_fn_t *) __ctors_start; | |
681 | ||
682 | for (; fn < (ctor_fn_t *) __ctors_end; fn++) | |
683 | (*fn)(); | |
684 | #endif | |
685 | } | |
686 | ||
687 | bool initcall_debug; | |
688 | core_param(initcall_debug, initcall_debug, bool, 0644); | |
689 | ||
690 | #ifdef CONFIG_KALLSYMS | |
691 | struct blacklist_entry { | |
692 | struct list_head next; | |
693 | char *buf; | |
694 | }; | |
695 | ||
696 | static __initdata_or_module LIST_HEAD(blacklisted_initcalls); | |
697 | ||
698 | static int __init initcall_blacklist(char *str) | |
699 | { | |
700 | char *str_entry; | |
701 | struct blacklist_entry *entry; | |
702 | ||
703 | /* str argument is a comma-separated list of functions */ | |
704 | do { | |
705 | str_entry = strsep(&str, ","); | |
706 | if (str_entry) { | |
707 | pr_debug("blacklisting initcall %s\n", str_entry); | |
708 | entry = alloc_bootmem(sizeof(*entry)); | |
709 | entry->buf = alloc_bootmem(strlen(str_entry) + 1); | |
710 | strcpy(entry->buf, str_entry); | |
711 | list_add(&entry->next, &blacklisted_initcalls); | |
712 | } | |
713 | } while (str_entry); | |
714 | ||
715 | return 0; | |
716 | } | |
717 | ||
718 | static bool __init_or_module initcall_blacklisted(initcall_t fn) | |
719 | { | |
720 | struct blacklist_entry *entry; | |
721 | char fn_name[KSYM_SYMBOL_LEN]; | |
722 | unsigned long addr; | |
723 | ||
724 | if (list_empty(&blacklisted_initcalls)) | |
725 | return false; | |
726 | ||
727 | addr = (unsigned long) dereference_function_descriptor(fn); | |
728 | sprint_symbol_no_offset(fn_name, addr); | |
729 | ||
730 | /* | |
731 | * fn will be "function_name [module_name]" where [module_name] is not | |
732 | * displayed for built-in init functions. Strip off the [module_name]. | |
733 | */ | |
734 | strreplace(fn_name, ' ', '\0'); | |
735 | ||
736 | list_for_each_entry(entry, &blacklisted_initcalls, next) { | |
737 | if (!strcmp(fn_name, entry->buf)) { | |
738 | pr_debug("initcall %s blacklisted\n", fn_name); | |
739 | return true; | |
740 | } | |
741 | } | |
742 | ||
743 | return false; | |
744 | } | |
745 | #else | |
746 | static int __init initcall_blacklist(char *str) | |
747 | { | |
748 | pr_warn("initcall_blacklist requires CONFIG_KALLSYMS\n"); | |
749 | return 0; | |
750 | } | |
751 | ||
752 | static bool __init_or_module initcall_blacklisted(initcall_t fn) | |
753 | { | |
754 | return false; | |
755 | } | |
756 | #endif | |
757 | __setup("initcall_blacklist=", initcall_blacklist); | |
758 | ||
759 | static int __init_or_module do_one_initcall_debug(initcall_t fn) | |
760 | { | |
761 | unsigned long long calltime, delta, rettime; | |
762 | unsigned long long duration; | |
763 | int ret; | |
764 | ||
765 | printk(KERN_DEBUG "calling %pF @ %i\n", fn, task_pid_nr(current)); | |
766 | calltime = local_clock(); | |
767 | ret = fn(); | |
768 | rettime = local_clock(); | |
769 | delta = rettime - calltime; | |
770 | duration = delta >> 10; | |
771 | printk(KERN_DEBUG "initcall %pF returned %d after %lld usecs\n", | |
772 | fn, ret, duration); | |
773 | ||
774 | return ret; | |
775 | } | |
776 | ||
777 | int __init_or_module do_one_initcall(initcall_t fn) | |
778 | { | |
779 | int count = preempt_count(); | |
780 | int ret; | |
781 | char msgbuf[64]; | |
782 | ||
783 | if (initcall_blacklisted(fn)) | |
784 | return -EPERM; | |
785 | ||
786 | if (initcall_debug) | |
787 | ret = do_one_initcall_debug(fn); | |
788 | else | |
789 | ret = fn(); | |
790 | ||
791 | msgbuf[0] = 0; | |
792 | ||
793 | if (preempt_count() != count) { | |
794 | sprintf(msgbuf, "preemption imbalance "); | |
795 | preempt_count_set(count); | |
796 | } | |
797 | if (irqs_disabled()) { | |
798 | strlcat(msgbuf, "disabled interrupts ", sizeof(msgbuf)); | |
799 | local_irq_enable(); | |
800 | } | |
801 | WARN(msgbuf[0], "initcall %pF returned with %s\n", fn, msgbuf); | |
802 | ||
803 | add_latent_entropy(); | |
804 | return ret; | |
805 | } | |
806 | ||
807 | ||
808 | extern initcall_t __initcall_start[]; | |
809 | extern initcall_t __initcall0_start[]; | |
810 | extern initcall_t __initcall1_start[]; | |
811 | extern initcall_t __initcall2_start[]; | |
812 | extern initcall_t __initcall3_start[]; | |
813 | extern initcall_t __initcall4_start[]; | |
814 | extern initcall_t __initcall5_start[]; | |
815 | extern initcall_t __initcall6_start[]; | |
816 | extern initcall_t __initcall7_start[]; | |
817 | extern initcall_t __initcall_end[]; | |
818 | ||
819 | static initcall_t *initcall_levels[] __initdata = { | |
820 | __initcall0_start, | |
821 | __initcall1_start, | |
822 | __initcall2_start, | |
823 | __initcall3_start, | |
824 | __initcall4_start, | |
825 | __initcall5_start, | |
826 | __initcall6_start, | |
827 | __initcall7_start, | |
828 | __initcall_end, | |
829 | }; | |
830 | ||
831 | /* Keep these in sync with initcalls in include/linux/init.h */ | |
832 | static char *initcall_level_names[] __initdata = { | |
833 | "early", | |
834 | "core", | |
835 | "postcore", | |
836 | "arch", | |
837 | "subsys", | |
838 | "fs", | |
839 | "device", | |
840 | "late", | |
841 | }; | |
842 | ||
843 | static void __init do_initcall_level(int level) | |
844 | { | |
845 | initcall_t *fn; | |
846 | ||
847 | strcpy(initcall_command_line, saved_command_line); | |
848 | parse_args(initcall_level_names[level], | |
849 | initcall_command_line, __start___param, | |
850 | __stop___param - __start___param, | |
851 | level, level, | |
852 | NULL, &repair_env_string); | |
853 | ||
854 | for (fn = initcall_levels[level]; fn < initcall_levels[level+1]; fn++) | |
855 | do_one_initcall(*fn); | |
856 | } | |
857 | ||
858 | static void __init do_initcalls(void) | |
859 | { | |
860 | int level; | |
861 | ||
862 | for (level = 0; level < ARRAY_SIZE(initcall_levels) - 1; level++) | |
863 | do_initcall_level(level); | |
864 | } | |
865 | ||
866 | /* | |
867 | * Ok, the machine is now initialized. None of the devices | |
868 | * have been touched yet, but the CPU subsystem is up and | |
869 | * running, and memory and process management works. | |
870 | * | |
871 | * Now we can finally start doing some real work.. | |
872 | */ | |
873 | static void __init do_basic_setup(void) | |
874 | { | |
875 | cpuset_init_smp(); | |
876 | shmem_init(); | |
877 | driver_init(); | |
878 | init_irq_proc(); | |
879 | do_ctors(); | |
880 | usermodehelper_enable(); | |
881 | do_initcalls(); | |
882 | random_int_secret_init(); | |
883 | } | |
884 | ||
885 | static void __init do_pre_smp_initcalls(void) | |
886 | { | |
887 | initcall_t *fn; | |
888 | ||
889 | for (fn = __initcall_start; fn < __initcall0_start; fn++) | |
890 | do_one_initcall(*fn); | |
891 | } | |
892 | ||
893 | /* | |
894 | * This function requests modules which should be loaded by default and is | |
895 | * called twice right after initrd is mounted and right before init is | |
896 | * exec'd. If such modules are on either initrd or rootfs, they will be | |
897 | * loaded before control is passed to userland. | |
898 | */ | |
899 | void __init load_default_modules(void) | |
900 | { | |
901 | load_default_elevator_module(); | |
902 | } | |
903 | ||
904 | static int run_init_process(const char *init_filename) | |
905 | { | |
906 | argv_init[0] = init_filename; | |
907 | return do_execve(getname_kernel(init_filename), | |
908 | (const char __user *const __user *)argv_init, | |
909 | (const char __user *const __user *)envp_init); | |
910 | } | |
911 | ||
912 | static int try_to_run_init_process(const char *init_filename) | |
913 | { | |
914 | int ret; | |
915 | ||
916 | ret = run_init_process(init_filename); | |
917 | ||
918 | if (ret && ret != -ENOENT) { | |
919 | pr_err("Starting init: %s exists but couldn't execute it (error %d)\n", | |
920 | init_filename, ret); | |
921 | } | |
922 | ||
923 | return ret; | |
924 | } | |
925 | ||
926 | static noinline void __init kernel_init_freeable(void); | |
927 | ||
928 | #if defined(CONFIG_DEBUG_RODATA) || defined(CONFIG_DEBUG_SET_MODULE_RONX) | |
929 | bool rodata_enabled __ro_after_init = true; | |
930 | static int __init set_debug_rodata(char *str) | |
931 | { | |
932 | return strtobool(str, &rodata_enabled); | |
933 | } | |
934 | __setup("rodata=", set_debug_rodata); | |
935 | #endif | |
936 | ||
937 | #ifdef CONFIG_DEBUG_RODATA | |
938 | static void mark_readonly(void) | |
939 | { | |
940 | if (rodata_enabled) | |
941 | mark_rodata_ro(); | |
942 | else | |
943 | pr_info("Kernel memory protection disabled.\n"); | |
944 | } | |
945 | #else | |
946 | static inline void mark_readonly(void) | |
947 | { | |
948 | pr_warn("This architecture does not have kernel memory protection.\n"); | |
949 | } | |
950 | #endif | |
951 | ||
952 | static int __ref kernel_init(void *unused) | |
953 | { | |
954 | int ret; | |
955 | ||
956 | kernel_init_freeable(); | |
957 | /* need to finish all async __init code before freeing the memory */ | |
958 | async_synchronize_full(); | |
959 | free_initmem(); | |
960 | mark_readonly(); | |
961 | system_state = SYSTEM_RUNNING; | |
962 | numa_default_policy(); | |
963 | ||
964 | flush_delayed_fput(); | |
965 | ||
966 | rcu_end_inkernel_boot(); | |
967 | ||
968 | if (ramdisk_execute_command) { | |
969 | ret = run_init_process(ramdisk_execute_command); | |
970 | if (!ret) | |
971 | return 0; | |
972 | pr_err("Failed to execute %s (error %d)\n", | |
973 | ramdisk_execute_command, ret); | |
974 | } | |
975 | ||
976 | /* | |
977 | * We try each of these until one succeeds. | |
978 | * | |
979 | * The Bourne shell can be used instead of init if we are | |
980 | * trying to recover a really broken machine. | |
981 | */ | |
982 | if (execute_command) { | |
983 | ret = run_init_process(execute_command); | |
984 | if (!ret) | |
985 | return 0; | |
986 | panic("Requested init %s failed (error %d).", | |
987 | execute_command, ret); | |
988 | } | |
989 | if (!try_to_run_init_process("/sbin/init") || | |
990 | !try_to_run_init_process("/etc/init") || | |
991 | !try_to_run_init_process("/bin/init") || | |
992 | !try_to_run_init_process("/bin/sh")) | |
993 | return 0; | |
994 | ||
995 | panic("No working init found. Try passing init= option to kernel. " | |
996 | "See Linux Documentation/admin-guide/init.rst for guidance."); | |
997 | } | |
998 | ||
999 | static noinline void __init kernel_init_freeable(void) | |
1000 | { | |
1001 | /* | |
1002 | * Wait until kthreadd is all set-up. | |
1003 | */ | |
1004 | wait_for_completion(&kthreadd_done); | |
1005 | ||
1006 | /* Now the scheduler is fully set up and can do blocking allocations */ | |
1007 | gfp_allowed_mask = __GFP_BITS_MASK; | |
1008 | ||
1009 | /* | |
1010 | * init can allocate pages on any node | |
1011 | */ | |
1012 | set_mems_allowed(node_states[N_MEMORY]); | |
1013 | /* | |
1014 | * init can run on any cpu. | |
1015 | */ | |
1016 | set_cpus_allowed_ptr(current, cpu_all_mask); | |
1017 | ||
1018 | cad_pid = task_pid(current); | |
1019 | ||
1020 | smp_prepare_cpus(setup_max_cpus); | |
1021 | ||
1022 | workqueue_init(); | |
1023 | ||
1024 | do_pre_smp_initcalls(); | |
1025 | lockup_detector_init(); | |
1026 | ||
1027 | smp_init(); | |
1028 | sched_init_smp(); | |
1029 | ||
1030 | page_alloc_init_late(); | |
1031 | ||
1032 | do_basic_setup(); | |
1033 | ||
1034 | /* Open the /dev/console on the rootfs, this should never fail */ | |
1035 | if (sys_open((const char __user *) "/dev/console", O_RDWR, 0) < 0) | |
1036 | pr_err("Warning: unable to open an initial console.\n"); | |
1037 | ||
1038 | (void) sys_dup(0); | |
1039 | (void) sys_dup(0); | |
1040 | /* | |
1041 | * check if there is an early userspace init. If yes, let it do all | |
1042 | * the work | |
1043 | */ | |
1044 | ||
1045 | if (!ramdisk_execute_command) | |
1046 | ramdisk_execute_command = "/init"; | |
1047 | ||
1048 | if (sys_access((const char __user *) ramdisk_execute_command, 0) != 0) { | |
1049 | ramdisk_execute_command = NULL; | |
1050 | prepare_namespace(); | |
1051 | } | |
1052 | ||
1053 | /* | |
1054 | * Ok, we have completed the initial bootup, and | |
1055 | * we're essentially up and running. Get rid of the | |
1056 | * initmem segments and start the user-mode stuff.. | |
1057 | * | |
1058 | * rootfs is available now, try loading the public keys | |
1059 | * and default modules | |
1060 | */ | |
1061 | ||
1062 | integrity_load_keys(); | |
1063 | load_default_modules(); | |
1064 | } |