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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_cgroup.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 | |
81 | #include <asm/io.h> |
82 | #include <asm/bugs.h> |
83 | #include <asm/setup.h> |
84 | #include <asm/sections.h> |
85 | #include <asm/cacheflush.h> |
86 | |
87 | #ifdef CONFIG_X86_LOCAL_APIC |
88 | #include <asm/smp.h> |
89 | #endif |
90 | |
91 | static int kernel_init(void *); |
92 | |
93 | extern void init_IRQ(void); |
94 | extern void fork_init(unsigned long); |
95 | extern void radix_tree_init(void); |
96 | #ifndef CONFIG_DEBUG_RODATA |
97 | static inline void mark_rodata_ro(void) { } |
98 | #endif |
99 | |
100 | /* |
101 | * Debug helper: via this flag we know that we are in 'early bootup code' |
102 | * where only the boot processor is running with IRQ disabled. This means |
103 | * two things - IRQ must not be enabled before the flag is cleared and some |
104 | * operations which are not allowed with IRQ disabled are allowed while the |
105 | * flag is set. |
106 | */ |
107 | bool early_boot_irqs_disabled __read_mostly; |
108 | |
109 | enum system_states system_state __read_mostly; |
110 | EXPORT_SYMBOL(system_state); |
111 | |
112 | /* |
113 | * Boot command-line arguments |
114 | */ |
115 | #define MAX_INIT_ARGS CONFIG_INIT_ENV_ARG_LIMIT |
116 | #define MAX_INIT_ENVS CONFIG_INIT_ENV_ARG_LIMIT |
117 | |
118 | extern void time_init(void); |
119 | /* Default late time init is NULL. archs can override this later. */ |
120 | void (*__initdata late_time_init)(void); |
121 | |
122 | /* Untouched command line saved by arch-specific code. */ |
123 | char __initdata boot_command_line[COMMAND_LINE_SIZE]; |
124 | /* Untouched saved command line (eg. for /proc) */ |
125 | char *saved_command_line; |
126 | /* Command line for parameter parsing */ |
127 | static char *static_command_line; |
128 | /* Command line for per-initcall parameter parsing */ |
129 | static char *initcall_command_line; |
130 | |
131 | static char *execute_command; |
132 | static char *ramdisk_execute_command; |
133 | |
134 | /* |
135 | * Used to generate warnings if static_key manipulation functions are used |
136 | * before jump_label_init is called. |
137 | */ |
138 | bool static_key_initialized __read_mostly = false; |
139 | EXPORT_SYMBOL_GPL(static_key_initialized); |
140 | |
141 | /* |
142 | * If set, this is an indication to the drivers that reset the underlying |
143 | * device before going ahead with the initialization otherwise driver might |
144 | * rely on the BIOS and skip the reset operation. |
145 | * |
146 | * This is useful if kernel is booting in an unreliable environment. |
147 | * For ex. kdump situaiton where previous kernel has crashed, BIOS has been |
148 | * skipped and devices will be in unknown state. |
149 | */ |
150 | unsigned int reset_devices; |
151 | EXPORT_SYMBOL(reset_devices); |
152 | |
153 | static int __init set_reset_devices(char *str) |
154 | { |
155 | reset_devices = 1; |
156 | return 1; |
157 | } |
158 | |
159 | __setup("reset_devices", set_reset_devices); |
160 | |
161 | static const char * argv_init[MAX_INIT_ARGS+2] = { "init", NULL, }; |
162 | const char * envp_init[MAX_INIT_ENVS+2] = { "HOME=/", "TERM=linux", NULL, }; |
163 | static const char *panic_later, *panic_param; |
164 | |
165 | extern const struct obs_kernel_param __setup_start[], __setup_end[]; |
166 | |
167 | static int __init obsolete_checksetup(char *line) |
168 | { |
169 | const struct obs_kernel_param *p; |
170 | int had_early_param = 0; |
171 | |
172 | p = __setup_start; |
173 | do { |
174 | int n = strlen(p->str); |
175 | if (parameqn(line, p->str, n)) { |
176 | if (p->early) { |
177 | /* Already done in parse_early_param? |
178 | * (Needs exact match on param part). |
179 | * Keep iterating, as we can have early |
180 | * params and __setups of same names 8( */ |
181 | if (line[n] == '\0' || line[n] == '=') |
182 | had_early_param = 1; |
183 | } else if (!p->setup_func) { |
184 | pr_warn("Parameter %s is obsolete, ignored\n", |
185 | p->str); |
186 | return 1; |
187 | } else if (p->setup_func(line + n)) |
188 | return 1; |
189 | } |
190 | p++; |
191 | } while (p < __setup_end); |
192 | |
193 | return had_early_param; |
194 | } |
195 | |
196 | /* |
197 | * This should be approx 2 Bo*oMips to start (note initial shift), and will |
198 | * still work even if initially too large, it will just take slightly longer |
199 | */ |
200 | unsigned long loops_per_jiffy = (1<<12); |
201 | |
202 | EXPORT_SYMBOL(loops_per_jiffy); |
203 | |
204 | static int __init debug_kernel(char *str) |
205 | { |
206 | console_loglevel = 10; |
207 | return 0; |
208 | } |
209 | |
210 | static int __init quiet_kernel(char *str) |
211 | { |
212 | console_loglevel = 4; |
213 | return 0; |
214 | } |
215 | |
216 | early_param("debug", debug_kernel); |
217 | early_param("quiet", quiet_kernel); |
218 | |
219 | static int __init loglevel(char *str) |
220 | { |
221 | int newlevel; |
222 | |
223 | /* |
224 | * Only update loglevel value when a correct setting was passed, |
225 | * to prevent blind crashes (when loglevel being set to 0) that |
226 | * are quite hard to debug |
227 | */ |
228 | if (get_option(&str, &newlevel)) { |
229 | console_loglevel = newlevel; |
230 | return 0; |
231 | } |
232 | |
233 | return -EINVAL; |
234 | } |
235 | |
236 | early_param("loglevel", loglevel); |
237 | |
238 | /* Change NUL term back to "=", to make "param" the whole string. */ |
239 | static int __init repair_env_string(char *param, char *val, const char *unused) |
240 | { |
241 | if (val) { |
242 | /* param=val or param="val"? */ |
243 | if (val == param+strlen(param)+1) |
244 | val[-1] = '='; |
245 | else if (val == param+strlen(param)+2) { |
246 | val[-2] = '='; |
247 | memmove(val-1, val, strlen(val)+1); |
248 | val--; |
249 | } else |
250 | BUG(); |
251 | } |
252 | return 0; |
253 | } |
254 | |
255 | /* |
256 | * Unknown boot options get handed to init, unless they look like |
257 | * unused parameters (modprobe will find them in /proc/cmdline). |
258 | */ |
259 | static int __init unknown_bootoption(char *param, char *val, const char *unused) |
260 | { |
261 | repair_env_string(param, val, unused); |
262 | |
263 | /* Handle obsolete-style parameters */ |
264 | if (obsolete_checksetup(param)) |
265 | return 0; |
266 | |
267 | /* Unused module parameter. */ |
268 | if (strchr(param, '.') && (!val || strchr(param, '.') < val)) |
269 | return 0; |
270 | |
271 | if (panic_later) |
272 | return 0; |
273 | |
274 | if (val) { |
275 | /* Environment option */ |
276 | unsigned int i; |
277 | for (i = 0; envp_init[i]; i++) { |
278 | if (i == MAX_INIT_ENVS) { |
279 | panic_later = "env"; |
280 | panic_param = param; |
281 | } |
282 | if (!strncmp(param, envp_init[i], val - param)) |
283 | break; |
284 | } |
285 | envp_init[i] = param; |
286 | } else { |
287 | /* Command line option */ |
288 | unsigned int i; |
289 | for (i = 0; argv_init[i]; i++) { |
290 | if (i == MAX_INIT_ARGS) { |
291 | panic_later = "init"; |
292 | panic_param = param; |
293 | } |
294 | } |
295 | argv_init[i] = param; |
296 | } |
297 | return 0; |
298 | } |
299 | |
300 | static int __init init_setup(char *str) |
301 | { |
302 | unsigned int i; |
303 | |
304 | execute_command = str; |
305 | /* |
306 | * In case LILO is going to boot us with default command line, |
307 | * it prepends "auto" before the whole cmdline which makes |
308 | * the shell think it should execute a script with such name. |
309 | * So we ignore all arguments entered _before_ init=... [MJ] |
310 | */ |
311 | for (i = 1; i < MAX_INIT_ARGS; i++) |
312 | argv_init[i] = NULL; |
313 | return 1; |
314 | } |
315 | __setup("init=", init_setup); |
316 | |
317 | static int __init rdinit_setup(char *str) |
318 | { |
319 | unsigned int i; |
320 | |
321 | ramdisk_execute_command = str; |
322 | /* See "auto" comment in init_setup */ |
323 | for (i = 1; i < MAX_INIT_ARGS; i++) |
324 | argv_init[i] = NULL; |
325 | return 1; |
326 | } |
327 | __setup("rdinit=", rdinit_setup); |
328 | |
329 | #ifndef CONFIG_SMP |
330 | static const unsigned int setup_max_cpus = NR_CPUS; |
331 | #ifdef CONFIG_X86_LOCAL_APIC |
332 | static void __init smp_init(void) |
333 | { |
334 | APIC_init_uniprocessor(); |
335 | } |
336 | #else |
337 | #define smp_init() do { } while (0) |
338 | #endif |
339 | |
340 | static inline void setup_nr_cpu_ids(void) { } |
341 | static inline void smp_prepare_cpus(unsigned int maxcpus) { } |
342 | #endif |
343 | |
344 | /* |
345 | * We need to store the untouched command line for future reference. |
346 | * We also need to store the touched command line since the parameter |
347 | * parsing is performed in place, and we should allow a component to |
348 | * store reference of name/value for future reference. |
349 | */ |
350 | static void __init setup_command_line(char *command_line) |
351 | { |
352 | saved_command_line = |
353 | memblock_virt_alloc(strlen(boot_command_line) + 1, 0); |
354 | initcall_command_line = |
355 | memblock_virt_alloc(strlen(boot_command_line) + 1, 0); |
356 | static_command_line = memblock_virt_alloc(strlen(command_line) + 1, 0); |
357 | strcpy (saved_command_line, boot_command_line); |
358 | strcpy (static_command_line, command_line); |
359 | } |
360 | |
361 | /* |
362 | * We need to finalize in a non-__init function or else race conditions |
363 | * between the root thread and the init thread may cause start_kernel to |
364 | * be reaped by free_initmem before the root thread has proceeded to |
365 | * cpu_idle. |
366 | * |
367 | * gcc-3.4 accidentally inlines this function, so use noinline. |
368 | */ |
369 | |
370 | static __initdata DECLARE_COMPLETION(kthreadd_done); |
371 | |
372 | static noinline void __init_refok rest_init(void) |
373 | { |
374 | int pid; |
375 | |
376 | rcu_scheduler_starting(); |
377 | /* |
378 | * We need to spawn init first so that it obtains pid 1, however |
379 | * the init task will end up wanting to create kthreads, which, if |
380 | * we schedule it before we create kthreadd, will OOPS. |
381 | */ |
382 | kernel_thread(kernel_init, NULL, CLONE_FS | CLONE_SIGHAND); |
383 | numa_default_policy(); |
384 | pid = kernel_thread(kthreadd, NULL, CLONE_FS | CLONE_FILES); |
385 | rcu_read_lock(); |
386 | kthreadd_task = find_task_by_pid_ns(pid, &init_pid_ns); |
387 | rcu_read_unlock(); |
388 | complete(&kthreadd_done); |
389 | |
390 | /* |
391 | * The boot idle thread must execute schedule() |
392 | * at least once to get things moving: |
393 | */ |
394 | init_idle_bootup_task(current); |
395 | schedule_preempt_disabled(); |
396 | /* Call into cpu_idle with preempt disabled */ |
397 | cpu_startup_entry(CPUHP_ONLINE); |
398 | } |
399 | |
400 | /* Check for early params. */ |
401 | static int __init do_early_param(char *param, char *val, const char *unused) |
402 | { |
403 | const struct obs_kernel_param *p; |
404 | |
405 | for (p = __setup_start; p < __setup_end; p++) { |
406 | if ((p->early && parameq(param, p->str)) || |
407 | (strcmp(param, "console") == 0 && |
408 | strcmp(p->str, "earlycon") == 0) |
409 | ) { |
410 | if (p->setup_func(val) != 0) |
411 | pr_warn("Malformed early option '%s'\n", param); |
412 | } |
413 | } |
414 | /* We accept everything at this stage. */ |
415 | return 0; |
416 | } |
417 | |
418 | void __init parse_early_options(char *cmdline) |
419 | { |
420 | parse_args("early options", cmdline, NULL, 0, 0, 0, do_early_param); |
421 | } |
422 | |
423 | /* Arch code calls this early on, or if not, just before other parsing. */ |
424 | void __init parse_early_param(void) |
425 | { |
426 | static __initdata int done = 0; |
427 | static __initdata char tmp_cmdline[COMMAND_LINE_SIZE]; |
428 | |
429 | if (done) |
430 | return; |
431 | |
432 | /* All fall through to do_early_param. */ |
433 | strlcpy(tmp_cmdline, boot_command_line, COMMAND_LINE_SIZE); |
434 | parse_early_options(tmp_cmdline); |
435 | done = 1; |
436 | } |
437 | |
438 | /* |
439 | * Activate the first processor. |
440 | */ |
441 | |
442 | static void __init boot_cpu_init(void) |
443 | { |
444 | int cpu = smp_processor_id(); |
445 | /* Mark the boot cpu "present", "online" etc for SMP and UP case */ |
446 | set_cpu_online(cpu, true); |
447 | set_cpu_active(cpu, true); |
448 | set_cpu_present(cpu, true); |
449 | set_cpu_possible(cpu, true); |
450 | } |
451 | |
452 | void __init __weak smp_setup_processor_id(void) |
453 | { |
454 | } |
455 | |
456 | # if THREAD_SIZE >= PAGE_SIZE |
457 | void __init __weak thread_info_cache_init(void) |
458 | { |
459 | } |
460 | #endif |
461 | |
462 | /* |
463 | * Set up kernel memory allocators |
464 | */ |
465 | static void __init mm_init(void) |
466 | { |
467 | /* |
468 | * page_cgroup requires contiguous pages, |
469 | * bigger than MAX_ORDER unless SPARSEMEM. |
470 | */ |
471 | page_cgroup_init_flatmem(); |
472 | mem_init(); |
473 | kmem_cache_init(); |
474 | percpu_init_late(); |
475 | pgtable_init(); |
476 | vmalloc_init(); |
477 | } |
478 | |
479 | asmlinkage __visible void __init start_kernel(void) |
480 | { |
481 | char * command_line; |
482 | extern const struct kernel_param __start___param[], __stop___param[]; |
483 | |
484 | /* |
485 | * Need to run as early as possible, to initialize the |
486 | * lockdep hash: |
487 | */ |
488 | lockdep_init(); |
489 | smp_setup_processor_id(); |
490 | debug_objects_early_init(); |
491 | |
492 | /* |
493 | * Set up the the initial canary ASAP: |
494 | */ |
495 | boot_init_stack_canary(); |
496 | |
497 | cgroup_init_early(); |
498 | |
499 | local_irq_disable(); |
500 | early_boot_irqs_disabled = true; |
501 | |
502 | /* |
503 | * Interrupts are still disabled. Do necessary setups, then |
504 | * enable them |
505 | */ |
506 | boot_cpu_init(); |
507 | page_address_init(); |
508 | pr_notice("%s", linux_banner); |
509 | setup_arch(&command_line); |
510 | mm_init_owner(&init_mm, &init_task); |
511 | mm_init_cpumask(&init_mm); |
512 | setup_command_line(command_line); |
513 | setup_nr_cpu_ids(); |
514 | setup_per_cpu_areas(); |
515 | smp_prepare_boot_cpu(); /* arch-specific boot-cpu hooks */ |
516 | |
517 | build_all_zonelists(NULL, NULL); |
518 | page_alloc_init(); |
519 | |
520 | pr_notice("Kernel command line: %s\n", boot_command_line); |
521 | parse_early_param(); |
522 | parse_args("Booting kernel", static_command_line, __start___param, |
523 | __stop___param - __start___param, |
524 | -1, -1, &unknown_bootoption); |
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(), "Interrupts were enabled *very* early, fixing it\n")) |
551 | local_irq_disable(); |
552 | idr_init_cache(); |
553 | rcu_init(); |
554 | tick_nohz_init(); |
555 | context_tracking_init(); |
556 | radix_tree_init(); |
557 | /* init some links before init_ISA_irqs() */ |
558 | early_irq_init(); |
559 | init_IRQ(); |
560 | tick_init(); |
561 | init_timers(); |
562 | hrtimers_init(); |
563 | softirq_init(); |
564 | timekeeping_init(); |
565 | time_init(); |
566 | sched_clock_postinit(); |
567 | perf_event_init(); |
568 | profile_init(); |
569 | call_function_init(); |
570 | WARN(!irqs_disabled(), "Interrupts were enabled early\n"); |
571 | early_boot_irqs_disabled = false; |
572 | local_irq_enable(); |
573 | |
574 | kmem_cache_init_late(); |
575 | |
576 | /* |
577 | * HACK ALERT! This is early. We're enabling the console before |
578 | * we've done PCI setups etc, and console_init() must be aware of |
579 | * this. But we do want output early, in case something goes wrong. |
580 | */ |
581 | console_init(); |
582 | if (panic_later) |
583 | panic("Too many boot %s vars at `%s'", panic_later, |
584 | panic_param); |
585 | |
586 | lockdep_info(); |
587 | |
588 | /* |
589 | * Need to run this when irqs are enabled, because it wants |
590 | * to self-test [hard/soft]-irqs on/off lock inversion bugs |
591 | * too: |
592 | */ |
593 | locking_selftest(); |
594 | |
595 | #ifdef CONFIG_BLK_DEV_INITRD |
596 | if (initrd_start && !initrd_below_start_ok && |
597 | page_to_pfn(virt_to_page((void *)initrd_start)) < min_low_pfn) { |
598 | pr_crit("initrd overwritten (0x%08lx < 0x%08lx) - disabling it.\n", |
599 | page_to_pfn(virt_to_page((void *)initrd_start)), |
600 | min_low_pfn); |
601 | initrd_start = 0; |
602 | } |
603 | #endif |
604 | page_cgroup_init(); |
605 | debug_objects_mem_init(); |
606 | kmemleak_init(); |
607 | setup_per_cpu_pageset(); |
608 | numa_policy_init(); |
609 | if (late_time_init) |
610 | late_time_init(); |
611 | sched_clock_init(); |
612 | calibrate_delay(); |
613 | pidmap_init(); |
614 | anon_vma_init(); |
615 | acpi_early_init(); |
616 | #ifdef CONFIG_X86 |
617 | if (efi_enabled(EFI_RUNTIME_SERVICES)) |
618 | efi_enter_virtual_mode(); |
619 | #endif |
620 | thread_info_cache_init(); |
621 | cred_init(); |
622 | fork_init(totalram_pages); |
623 | proc_caches_init(); |
624 | buffer_init(); |
625 | key_init(); |
626 | security_init(); |
627 | dbg_late_init(); |
628 | vfs_caches_init(totalram_pages); |
629 | signals_init(); |
630 | /* rootfs populating might need page-writeback */ |
631 | page_writeback_init(); |
632 | #ifdef CONFIG_PROC_FS |
633 | proc_root_init(); |
634 | #endif |
635 | cgroup_init(); |
636 | cpuset_init(); |
637 | taskstats_init_early(); |
638 | delayacct_init(); |
639 | |
640 | check_bugs(); |
641 | |
642 | sfi_init_late(); |
643 | |
644 | if (efi_enabled(EFI_RUNTIME_SERVICES)) { |
645 | efi_late_init(); |
646 | efi_free_boot_services(); |
647 | } |
648 | |
649 | ftrace_init(); |
650 | |
651 | /* Do the rest non-__init'ed, we're now alive */ |
652 | rest_init(); |
653 | } |
654 | |
655 | /* Call all constructor functions linked into the kernel. */ |
656 | static void __init do_ctors(void) |
657 | { |
658 | #ifdef CONFIG_CONSTRUCTORS |
659 | ctor_fn_t *fn = (ctor_fn_t *) __ctors_start; |
660 | |
661 | for (; fn < (ctor_fn_t *) __ctors_end; fn++) |
662 | (*fn)(); |
663 | #endif |
664 | } |
665 | |
666 | bool initcall_debug; |
667 | core_param(initcall_debug, initcall_debug, bool, 0644); |
668 | |
669 | static int __init_or_module do_one_initcall_debug(initcall_t fn) |
670 | { |
671 | ktime_t calltime, delta, rettime; |
672 | unsigned long long duration; |
673 | int ret; |
674 | |
675 | pr_debug("calling %pF @ %i\n", fn, task_pid_nr(current)); |
676 | calltime = ktime_get(); |
677 | ret = fn(); |
678 | rettime = ktime_get(); |
679 | delta = ktime_sub(rettime, calltime); |
680 | duration = (unsigned long long) ktime_to_ns(delta) >> 10; |
681 | pr_debug("initcall %pF returned %d after %lld usecs\n", |
682 | fn, ret, duration); |
683 | |
684 | return ret; |
685 | } |
686 | |
687 | int __init_or_module do_one_initcall(initcall_t fn) |
688 | { |
689 | int count = preempt_count(); |
690 | int ret; |
691 | char msgbuf[64]; |
692 | |
693 | if (initcall_debug) |
694 | ret = do_one_initcall_debug(fn); |
695 | else |
696 | ret = fn(); |
697 | |
698 | msgbuf[0] = 0; |
699 | |
700 | if (preempt_count() != count) { |
701 | sprintf(msgbuf, "preemption imbalance "); |
702 | preempt_count_set(count); |
703 | } |
704 | if (irqs_disabled()) { |
705 | strlcat(msgbuf, "disabled interrupts ", sizeof(msgbuf)); |
706 | local_irq_enable(); |
707 | } |
708 | WARN(msgbuf[0], "initcall %pF returned with %s\n", fn, msgbuf); |
709 | |
710 | return ret; |
711 | } |
712 | |
713 | |
714 | extern initcall_t __initcall_start[]; |
715 | extern initcall_t __initcall0_start[]; |
716 | extern initcall_t __initcall1_start[]; |
717 | extern initcall_t __initcall2_start[]; |
718 | extern initcall_t __initcall3_start[]; |
719 | extern initcall_t __initcall4_start[]; |
720 | extern initcall_t __initcall5_start[]; |
721 | extern initcall_t __initcall6_start[]; |
722 | extern initcall_t __initcall7_start[]; |
723 | extern initcall_t __initcall_end[]; |
724 | |
725 | static initcall_t *initcall_levels[] __initdata = { |
726 | __initcall0_start, |
727 | __initcall1_start, |
728 | __initcall2_start, |
729 | __initcall3_start, |
730 | __initcall4_start, |
731 | __initcall5_start, |
732 | __initcall6_start, |
733 | __initcall7_start, |
734 | __initcall_end, |
735 | }; |
736 | |
737 | /* Keep these in sync with initcalls in include/linux/init.h */ |
738 | static char *initcall_level_names[] __initdata = { |
739 | "early", |
740 | "core", |
741 | "postcore", |
742 | "arch", |
743 | "subsys", |
744 | "fs", |
745 | "device", |
746 | "late", |
747 | }; |
748 | |
749 | static void __init do_initcall_level(int level) |
750 | { |
751 | extern const struct kernel_param __start___param[], __stop___param[]; |
752 | initcall_t *fn; |
753 | |
754 | strcpy(initcall_command_line, saved_command_line); |
755 | parse_args(initcall_level_names[level], |
756 | initcall_command_line, __start___param, |
757 | __stop___param - __start___param, |
758 | level, level, |
759 | &repair_env_string); |
760 | |
761 | for (fn = initcall_levels[level]; fn < initcall_levels[level+1]; fn++) |
762 | do_one_initcall(*fn); |
763 | } |
764 | |
765 | static void __init do_initcalls(void) |
766 | { |
767 | int level; |
768 | |
769 | for (level = 0; level < ARRAY_SIZE(initcall_levels) - 1; level++) |
770 | do_initcall_level(level); |
771 | } |
772 | |
773 | /* |
774 | * Ok, the machine is now initialized. None of the devices |
775 | * have been touched yet, but the CPU subsystem is up and |
776 | * running, and memory and process management works. |
777 | * |
778 | * Now we can finally start doing some real work.. |
779 | */ |
780 | static void __init do_basic_setup(void) |
781 | { |
782 | cpuset_init_smp(); |
783 | usermodehelper_init(); |
784 | shmem_init(); |
785 | driver_init(); |
786 | init_irq_proc(); |
787 | do_ctors(); |
788 | usermodehelper_enable(); |
789 | do_initcalls(); |
790 | random_int_secret_init(); |
791 | } |
792 | |
793 | static void __init do_pre_smp_initcalls(void) |
794 | { |
795 | initcall_t *fn; |
796 | |
797 | for (fn = __initcall_start; fn < __initcall0_start; fn++) |
798 | do_one_initcall(*fn); |
799 | } |
800 | |
801 | /* |
802 | * This function requests modules which should be loaded by default and is |
803 | * called twice right after initrd is mounted and right before init is |
804 | * exec'd. If such modules are on either initrd or rootfs, they will be |
805 | * loaded before control is passed to userland. |
806 | */ |
807 | void __init load_default_modules(void) |
808 | { |
809 | load_default_elevator_module(); |
810 | } |
811 | |
812 | static int run_init_process(const char *init_filename) |
813 | { |
814 | argv_init[0] = init_filename; |
815 | return do_execve(getname_kernel(init_filename), |
816 | (const char __user *const __user *)argv_init, |
817 | (const char __user *const __user *)envp_init); |
818 | } |
819 | |
820 | static int try_to_run_init_process(const char *init_filename) |
821 | { |
822 | int ret; |
823 | |
824 | ret = run_init_process(init_filename); |
825 | |
826 | if (ret && ret != -ENOENT) { |
827 | pr_err("Starting init: %s exists but couldn't execute it (error %d)\n", |
828 | init_filename, ret); |
829 | } |
830 | |
831 | return ret; |
832 | } |
833 | |
834 | static noinline void __init kernel_init_freeable(void); |
835 | |
836 | static int __ref kernel_init(void *unused) |
837 | { |
838 | int ret; |
839 | |
840 | kernel_init_freeable(); |
841 | /* need to finish all async __init code before freeing the memory */ |
842 | async_synchronize_full(); |
843 | free_initmem(); |
844 | mark_rodata_ro(); |
845 | system_state = SYSTEM_RUNNING; |
846 | numa_default_policy(); |
847 | |
848 | flush_delayed_fput(); |
849 | |
850 | if (ramdisk_execute_command) { |
851 | ret = run_init_process(ramdisk_execute_command); |
852 | if (!ret) |
853 | return 0; |
854 | pr_err("Failed to execute %s (error %d)\n", |
855 | ramdisk_execute_command, ret); |
856 | } |
857 | |
858 | /* |
859 | * We try each of these until one succeeds. |
860 | * |
861 | * The Bourne shell can be used instead of init if we are |
862 | * trying to recover a really broken machine. |
863 | */ |
864 | if (execute_command) { |
865 | ret = run_init_process(execute_command); |
866 | if (!ret) |
867 | return 0; |
868 | pr_err("Failed to execute %s (error %d). Attempting defaults...\n", |
869 | execute_command, ret); |
870 | } |
871 | if (!try_to_run_init_process("/sbin/init") || |
872 | !try_to_run_init_process("/etc/init") || |
873 | !try_to_run_init_process("/bin/init") || |
874 | !try_to_run_init_process("/bin/sh")) |
875 | return 0; |
876 | |
877 | panic("No working init found. Try passing init= option to kernel. " |
878 | "See Linux Documentation/init.txt for guidance."); |
879 | } |
880 | |
881 | static noinline void __init kernel_init_freeable(void) |
882 | { |
883 | /* |
884 | * Wait until kthreadd is all set-up. |
885 | */ |
886 | wait_for_completion(&kthreadd_done); |
887 | |
888 | /* Now the scheduler is fully set up and can do blocking allocations */ |
889 | gfp_allowed_mask = __GFP_BITS_MASK; |
890 | |
891 | /* |
892 | * init can allocate pages on any node |
893 | */ |
894 | set_mems_allowed(node_states[N_MEMORY]); |
895 | /* |
896 | * init can run on any cpu. |
897 | */ |
898 | set_cpus_allowed_ptr(current, cpu_all_mask); |
899 | |
900 | cad_pid = task_pid(current); |
901 | |
902 | smp_prepare_cpus(setup_max_cpus); |
903 | |
904 | do_pre_smp_initcalls(); |
905 | lockup_detector_init(); |
906 | |
907 | smp_init(); |
908 | sched_init_smp(); |
909 | |
910 | do_basic_setup(); |
911 | |
912 | /* Open the /dev/console on the rootfs, this should never fail */ |
913 | if (sys_open((const char __user *) "/dev/console", O_RDWR, 0) < 0) |
914 | pr_err("Warning: unable to open an initial console.\n"); |
915 | |
916 | (void) sys_dup(0); |
917 | (void) sys_dup(0); |
918 | /* |
919 | * check if there is an early userspace init. If yes, let it do all |
920 | * the work |
921 | */ |
922 | |
923 | if (!ramdisk_execute_command) |
924 | ramdisk_execute_command = "/init"; |
925 | |
926 | if (sys_access((const char __user *) ramdisk_execute_command, 0) != 0) { |
927 | ramdisk_execute_command = NULL; |
928 | prepare_namespace(); |
929 | } |
930 | |
931 | /* |
932 | * Ok, we have completed the initial bootup, and |
933 | * we're essentially up and running. Get rid of the |
934 | * initmem segments and start the user-mode stuff.. |
935 | */ |
936 | |
937 | /* rootfs is available now, try loading default modules */ |
938 | load_default_modules(); |
939 | } |
940 |
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