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