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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 mca_init(void); |
96 | extern void sbus_init(void); |
97 | extern void radix_tree_init(void); |
98 | #ifndef CONFIG_DEBUG_RODATA |
99 | static inline void mark_rodata_ro(void) { } |
100 | #endif |
101 | |
102 | #ifdef CONFIG_TC |
103 | extern void tc_init(void); |
104 | #endif |
105 | |
106 | /* |
107 | * Debug helper: via this flag we know that we are in 'early bootup code' |
108 | * where only the boot processor is running with IRQ disabled. This means |
109 | * two things - IRQ must not be enabled before the flag is cleared and some |
110 | * operations which are not allowed with IRQ disabled are allowed while the |
111 | * flag is set. |
112 | */ |
113 | bool early_boot_irqs_disabled __read_mostly; |
114 | |
115 | enum system_states system_state __read_mostly; |
116 | EXPORT_SYMBOL(system_state); |
117 | |
118 | /* |
119 | * Boot command-line arguments |
120 | */ |
121 | #define MAX_INIT_ARGS CONFIG_INIT_ENV_ARG_LIMIT |
122 | #define MAX_INIT_ENVS CONFIG_INIT_ENV_ARG_LIMIT |
123 | |
124 | extern void time_init(void); |
125 | /* Default late time init is NULL. archs can override this later. */ |
126 | void (*__initdata late_time_init)(void); |
127 | extern void softirq_init(void); |
128 | |
129 | /* Untouched command line saved by arch-specific code. */ |
130 | char __initdata boot_command_line[COMMAND_LINE_SIZE]; |
131 | /* Untouched saved command line (eg. for /proc) */ |
132 | char *saved_command_line; |
133 | /* Command line for parameter parsing */ |
134 | static char *static_command_line; |
135 | |
136 | static char *execute_command; |
137 | static char *ramdisk_execute_command; |
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 situaiton 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 int __init obsolete_checksetup(char *line) |
166 | { |
167 | const struct obs_kernel_param *p; |
168 | int had_early_param = 0; |
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 = 1; |
181 | } else if (!p->setup_func) { |
182 | pr_warn("Parameter %s is obsolete, ignored\n", |
183 | p->str); |
184 | return 1; |
185 | } else if (p->setup_func(line + n)) |
186 | return 1; |
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 | |
200 | EXPORT_SYMBOL(loops_per_jiffy); |
201 | |
202 | static int __init debug_kernel(char *str) |
203 | { |
204 | console_loglevel = 10; |
205 | return 0; |
206 | } |
207 | |
208 | static int __init quiet_kernel(char *str) |
209 | { |
210 | console_loglevel = 4; |
211 | return 0; |
212 | } |
213 | |
214 | early_param("debug", debug_kernel); |
215 | early_param("quiet", quiet_kernel); |
216 | |
217 | static int __init loglevel(char *str) |
218 | { |
219 | int newlevel; |
220 | |
221 | /* |
222 | * Only update loglevel value when a correct setting was passed, |
223 | * to prevent blind crashes (when loglevel being set to 0) that |
224 | * are quite hard to debug |
225 | */ |
226 | if (get_option(&str, &newlevel)) { |
227 | console_loglevel = newlevel; |
228 | return 0; |
229 | } |
230 | |
231 | return -EINVAL; |
232 | } |
233 | |
234 | early_param("loglevel", loglevel); |
235 | |
236 | /* Change NUL term back to "=", to make "param" the whole string. */ |
237 | static int __init repair_env_string(char *param, char *val, const char *unused) |
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 | /* |
254 | * Unknown boot options get handed to init, unless they look like |
255 | * unused parameters (modprobe will find them in /proc/cmdline). |
256 | */ |
257 | static int __init unknown_bootoption(char *param, char *val, const char *unused) |
258 | { |
259 | repair_env_string(param, val, unused); |
260 | |
261 | /* Handle obsolete-style parameters */ |
262 | if (obsolete_checksetup(param)) |
263 | return 0; |
264 | |
265 | /* Unused module parameter. */ |
266 | if (strchr(param, '.') && (!val || strchr(param, '.') < val)) |
267 | return 0; |
268 | |
269 | if (panic_later) |
270 | return 0; |
271 | |
272 | if (val) { |
273 | /* Environment option */ |
274 | unsigned int i; |
275 | for (i = 0; envp_init[i]; i++) { |
276 | if (i == MAX_INIT_ENVS) { |
277 | panic_later = "Too many boot env vars at `%s'"; |
278 | panic_param = param; |
279 | } |
280 | if (!strncmp(param, envp_init[i], val - param)) |
281 | break; |
282 | } |
283 | envp_init[i] = param; |
284 | } else { |
285 | /* Command line option */ |
286 | unsigned int i; |
287 | for (i = 0; argv_init[i]; i++) { |
288 | if (i == MAX_INIT_ARGS) { |
289 | panic_later = "Too many boot init vars at `%s'"; |
290 | panic_param = param; |
291 | } |
292 | } |
293 | argv_init[i] = param; |
294 | } |
295 | return 0; |
296 | } |
297 | |
298 | static int __init init_setup(char *str) |
299 | { |
300 | unsigned int i; |
301 | |
302 | execute_command = str; |
303 | /* |
304 | * In case LILO is going to boot us with default command line, |
305 | * it prepends "auto" before the whole cmdline which makes |
306 | * the shell think it should execute a script with such name. |
307 | * So we ignore all arguments entered _before_ init=... [MJ] |
308 | */ |
309 | for (i = 1; i < MAX_INIT_ARGS; i++) |
310 | argv_init[i] = NULL; |
311 | return 1; |
312 | } |
313 | __setup("init=", init_setup); |
314 | |
315 | static int __init rdinit_setup(char *str) |
316 | { |
317 | unsigned int i; |
318 | |
319 | ramdisk_execute_command = str; |
320 | /* See "auto" comment in init_setup */ |
321 | for (i = 1; i < MAX_INIT_ARGS; i++) |
322 | argv_init[i] = NULL; |
323 | return 1; |
324 | } |
325 | __setup("rdinit=", rdinit_setup); |
326 | |
327 | #ifndef CONFIG_SMP |
328 | static const unsigned int setup_max_cpus = NR_CPUS; |
329 | #ifdef CONFIG_X86_LOCAL_APIC |
330 | static void __init smp_init(void) |
331 | { |
332 | APIC_init_uniprocessor(); |
333 | } |
334 | #else |
335 | #define smp_init() do { } while (0) |
336 | #endif |
337 | |
338 | static inline void setup_nr_cpu_ids(void) { } |
339 | static inline void smp_prepare_cpus(unsigned int maxcpus) { } |
340 | #endif |
341 | |
342 | /* |
343 | * We need to store the untouched command line for future reference. |
344 | * We also need to store the touched command line since the parameter |
345 | * parsing is performed in place, and we should allow a component to |
346 | * store reference of name/value for future reference. |
347 | */ |
348 | static void __init setup_command_line(char *command_line) |
349 | { |
350 | saved_command_line = alloc_bootmem(strlen (boot_command_line)+1); |
351 | static_command_line = alloc_bootmem(strlen (command_line)+1); |
352 | strcpy (saved_command_line, boot_command_line); |
353 | strcpy (static_command_line, command_line); |
354 | } |
355 | |
356 | /* |
357 | * We need to finalize in a non-__init function or else race conditions |
358 | * between the root thread and the init thread may cause start_kernel to |
359 | * be reaped by free_initmem before the root thread has proceeded to |
360 | * cpu_idle. |
361 | * |
362 | * gcc-3.4 accidentally inlines this function, so use noinline. |
363 | */ |
364 | |
365 | static __initdata DECLARE_COMPLETION(kthreadd_done); |
366 | |
367 | static noinline void __init_refok rest_init(void) |
368 | { |
369 | int pid; |
370 | |
371 | rcu_scheduler_starting(); |
372 | /* |
373 | * We need to spawn init first so that it obtains pid 1, however |
374 | * the init task will end up wanting to create kthreads, which, if |
375 | * we schedule it before we create kthreadd, will OOPS. |
376 | */ |
377 | kernel_thread(kernel_init, NULL, CLONE_FS | CLONE_SIGHAND); |
378 | numa_default_policy(); |
379 | pid = kernel_thread(kthreadd, NULL, CLONE_FS | CLONE_FILES); |
380 | rcu_read_lock(); |
381 | kthreadd_task = find_task_by_pid_ns(pid, &init_pid_ns); |
382 | rcu_read_unlock(); |
383 | complete(&kthreadd_done); |
384 | |
385 | /* |
386 | * The boot idle thread must execute schedule() |
387 | * at least once to get things moving: |
388 | */ |
389 | init_idle_bootup_task(current); |
390 | schedule_preempt_disabled(); |
391 | /* Call into cpu_idle with preempt disabled */ |
392 | cpu_startup_entry(CPUHP_ONLINE); |
393 | } |
394 | |
395 | /* Check for early params. */ |
396 | static int __init do_early_param(char *param, char *val, const char *unused) |
397 | { |
398 | const struct obs_kernel_param *p; |
399 | |
400 | for (p = __setup_start; p < __setup_end; p++) { |
401 | if ((p->early && parameq(param, p->str)) || |
402 | (strcmp(param, "console") == 0 && |
403 | strcmp(p->str, "earlycon") == 0) |
404 | ) { |
405 | if (p->setup_func(val) != 0) |
406 | pr_warn("Malformed early option '%s'\n", param); |
407 | } |
408 | } |
409 | /* We accept everything at this stage. */ |
410 | return 0; |
411 | } |
412 | |
413 | void __init parse_early_options(char *cmdline) |
414 | { |
415 | parse_args("early options", cmdline, NULL, 0, 0, 0, do_early_param); |
416 | } |
417 | |
418 | /* Arch code calls this early on, or if not, just before other parsing. */ |
419 | void __init parse_early_param(void) |
420 | { |
421 | static __initdata int done = 0; |
422 | static __initdata char tmp_cmdline[COMMAND_LINE_SIZE]; |
423 | |
424 | if (done) |
425 | return; |
426 | |
427 | /* All fall through to do_early_param. */ |
428 | strlcpy(tmp_cmdline, boot_command_line, COMMAND_LINE_SIZE); |
429 | parse_early_options(tmp_cmdline); |
430 | done = 1; |
431 | } |
432 | |
433 | /* |
434 | * Activate the first processor. |
435 | */ |
436 | |
437 | static void __init boot_cpu_init(void) |
438 | { |
439 | int cpu = smp_processor_id(); |
440 | /* Mark the boot cpu "present", "online" etc for SMP and UP case */ |
441 | set_cpu_online(cpu, true); |
442 | set_cpu_active(cpu, true); |
443 | set_cpu_present(cpu, true); |
444 | set_cpu_possible(cpu, true); |
445 | } |
446 | |
447 | void __init __weak smp_setup_processor_id(void) |
448 | { |
449 | } |
450 | |
451 | # if THREAD_SIZE >= PAGE_SIZE |
452 | void __init __weak thread_info_cache_init(void) |
453 | { |
454 | } |
455 | #endif |
456 | |
457 | /* |
458 | * Set up kernel memory allocators |
459 | */ |
460 | static void __init mm_init(void) |
461 | { |
462 | /* |
463 | * page_cgroup requires contiguous pages, |
464 | * bigger than MAX_ORDER unless SPARSEMEM. |
465 | */ |
466 | page_cgroup_init_flatmem(); |
467 | mem_init(); |
468 | kmem_cache_init(); |
469 | percpu_init_late(); |
470 | pgtable_cache_init(); |
471 | vmalloc_init(); |
472 | } |
473 | |
474 | asmlinkage void __init start_kernel(void) |
475 | { |
476 | char * command_line; |
477 | extern const struct kernel_param __start___param[], __stop___param[]; |
478 | |
479 | /* |
480 | * Need to run as early as possible, to initialize the |
481 | * lockdep hash: |
482 | */ |
483 | lockdep_init(); |
484 | smp_setup_processor_id(); |
485 | debug_objects_early_init(); |
486 | |
487 | /* |
488 | * Set up the the initial canary ASAP: |
489 | */ |
490 | boot_init_stack_canary(); |
491 | |
492 | cgroup_init_early(); |
493 | |
494 | local_irq_disable(); |
495 | early_boot_irqs_disabled = true; |
496 | |
497 | /* |
498 | * Interrupts are still disabled. Do necessary setups, then |
499 | * enable them |
500 | */ |
501 | boot_cpu_init(); |
502 | page_address_init(); |
503 | pr_notice("%s", linux_banner); |
504 | setup_arch(&command_line); |
505 | mm_init_owner(&init_mm, &init_task); |
506 | mm_init_cpumask(&init_mm); |
507 | setup_command_line(command_line); |
508 | setup_nr_cpu_ids(); |
509 | setup_per_cpu_areas(); |
510 | smp_prepare_boot_cpu(); /* arch-specific boot-cpu hooks */ |
511 | |
512 | build_all_zonelists(NULL, NULL); |
513 | page_alloc_init(); |
514 | |
515 | pr_notice("Kernel command line: %s\n", boot_command_line); |
516 | parse_early_param(); |
517 | parse_args("Booting kernel", static_command_line, __start___param, |
518 | __stop___param - __start___param, |
519 | -1, -1, &unknown_bootoption); |
520 | |
521 | jump_label_init(); |
522 | |
523 | /* |
524 | * These use large bootmem allocations and must precede |
525 | * kmem_cache_init() |
526 | */ |
527 | setup_log_buf(0); |
528 | pidhash_init(); |
529 | vfs_caches_init_early(); |
530 | sort_main_extable(); |
531 | trap_init(); |
532 | mm_init(); |
533 | |
534 | /* |
535 | * Set up the scheduler prior starting any interrupts (such as the |
536 | * timer interrupt). Full topology setup happens at smp_init() |
537 | * time - but meanwhile we still have a functioning scheduler. |
538 | */ |
539 | sched_init(); |
540 | /* |
541 | * Disable preemption - early bootup scheduling is extremely |
542 | * fragile until we cpu_idle() for the first time. |
543 | */ |
544 | preempt_disable(); |
545 | if (WARN(!irqs_disabled(), "Interrupts were enabled *very* early, fixing it\n")) |
546 | local_irq_disable(); |
547 | idr_init_cache(); |
548 | rcu_init(); |
549 | tick_nohz_init(); |
550 | context_tracking_init(); |
551 | radix_tree_init(); |
552 | /* init some links before init_ISA_irqs() */ |
553 | early_irq_init(); |
554 | init_IRQ(); |
555 | tick_init(); |
556 | init_timers(); |
557 | hrtimers_init(); |
558 | softirq_init(); |
559 | timekeeping_init(); |
560 | time_init(); |
561 | sched_clock_postinit(); |
562 | perf_event_init(); |
563 | profile_init(); |
564 | call_function_init(); |
565 | WARN(!irqs_disabled(), "Interrupts were enabled early\n"); |
566 | early_boot_irqs_disabled = false; |
567 | local_irq_enable(); |
568 | |
569 | kmem_cache_init_late(); |
570 | |
571 | /* |
572 | * HACK ALERT! This is early. We're enabling the console before |
573 | * we've done PCI setups etc, and console_init() must be aware of |
574 | * this. But we do want output early, in case something goes wrong. |
575 | */ |
576 | console_init(); |
577 | if (panic_later) |
578 | panic(panic_later, panic_param); |
579 | |
580 | lockdep_info(); |
581 | |
582 | /* |
583 | * Need to run this when irqs are enabled, because it wants |
584 | * to self-test [hard/soft]-irqs on/off lock inversion bugs |
585 | * too: |
586 | */ |
587 | locking_selftest(); |
588 | |
589 | #ifdef CONFIG_BLK_DEV_INITRD |
590 | if (initrd_start && !initrd_below_start_ok && |
591 | page_to_pfn(virt_to_page((void *)initrd_start)) < min_low_pfn) { |
592 | pr_crit("initrd overwritten (0x%08lx < 0x%08lx) - disabling it.\n", |
593 | page_to_pfn(virt_to_page((void *)initrd_start)), |
594 | min_low_pfn); |
595 | initrd_start = 0; |
596 | } |
597 | #endif |
598 | page_cgroup_init(); |
599 | debug_objects_mem_init(); |
600 | kmemleak_init(); |
601 | setup_per_cpu_pageset(); |
602 | numa_policy_init(); |
603 | if (late_time_init) |
604 | late_time_init(); |
605 | sched_clock_init(); |
606 | calibrate_delay(); |
607 | pidmap_init(); |
608 | anon_vma_init(); |
609 | #ifdef CONFIG_X86 |
610 | if (efi_enabled(EFI_RUNTIME_SERVICES)) |
611 | efi_enter_virtual_mode(); |
612 | #endif |
613 | thread_info_cache_init(); |
614 | cred_init(); |
615 | fork_init(totalram_pages); |
616 | proc_caches_init(); |
617 | buffer_init(); |
618 | key_init(); |
619 | security_init(); |
620 | dbg_late_init(); |
621 | vfs_caches_init(totalram_pages); |
622 | signals_init(); |
623 | /* rootfs populating might need page-writeback */ |
624 | page_writeback_init(); |
625 | #ifdef CONFIG_PROC_FS |
626 | proc_root_init(); |
627 | #endif |
628 | cgroup_init(); |
629 | cpuset_init(); |
630 | taskstats_init_early(); |
631 | delayacct_init(); |
632 | |
633 | check_bugs(); |
634 | |
635 | acpi_early_init(); /* before LAPIC and SMP init */ |
636 | sfi_init_late(); |
637 | |
638 | if (efi_enabled(EFI_RUNTIME_SERVICES)) { |
639 | efi_late_init(); |
640 | efi_free_boot_services(); |
641 | } |
642 | |
643 | ftrace_init(); |
644 | |
645 | /* Do the rest non-__init'ed, we're now alive */ |
646 | rest_init(); |
647 | } |
648 | |
649 | /* Call all constructor functions linked into the kernel. */ |
650 | static void __init do_ctors(void) |
651 | { |
652 | #ifdef CONFIG_CONSTRUCTORS |
653 | ctor_fn_t *fn = (ctor_fn_t *) __ctors_start; |
654 | |
655 | for (; fn < (ctor_fn_t *) __ctors_end; fn++) |
656 | (*fn)(); |
657 | #endif |
658 | } |
659 | |
660 | bool initcall_debug; |
661 | core_param(initcall_debug, initcall_debug, bool, 0644); |
662 | |
663 | static int __init_or_module do_one_initcall_debug(initcall_t fn) |
664 | { |
665 | ktime_t calltime, delta, rettime; |
666 | unsigned long long duration; |
667 | int ret; |
668 | |
669 | pr_debug("calling %pF @ %i\n", fn, task_pid_nr(current)); |
670 | calltime = ktime_get(); |
671 | ret = fn(); |
672 | rettime = ktime_get(); |
673 | delta = ktime_sub(rettime, calltime); |
674 | duration = (unsigned long long) ktime_to_ns(delta) >> 10; |
675 | pr_debug("initcall %pF returned %d after %lld usecs\n", |
676 | fn, ret, duration); |
677 | |
678 | return ret; |
679 | } |
680 | |
681 | int __init_or_module do_one_initcall(initcall_t fn) |
682 | { |
683 | int count = preempt_count(); |
684 | int ret; |
685 | char msgbuf[64]; |
686 | |
687 | if (initcall_debug) |
688 | ret = do_one_initcall_debug(fn); |
689 | else |
690 | ret = fn(); |
691 | |
692 | msgbuf[0] = 0; |
693 | |
694 | if (preempt_count() != count) { |
695 | sprintf(msgbuf, "preemption imbalance "); |
696 | preempt_count() = count; |
697 | } |
698 | if (irqs_disabled()) { |
699 | strlcat(msgbuf, "disabled interrupts ", sizeof(msgbuf)); |
700 | local_irq_enable(); |
701 | } |
702 | WARN(msgbuf[0], "initcall %pF returned with %s\n", fn, msgbuf); |
703 | |
704 | return ret; |
705 | } |
706 | |
707 | |
708 | extern initcall_t __initcall_start[]; |
709 | extern initcall_t __initcall0_start[]; |
710 | extern initcall_t __initcall1_start[]; |
711 | extern initcall_t __initcall2_start[]; |
712 | extern initcall_t __initcall3_start[]; |
713 | extern initcall_t __initcall4_start[]; |
714 | extern initcall_t __initcall5_start[]; |
715 | extern initcall_t __initcall6_start[]; |
716 | extern initcall_t __initcall7_start[]; |
717 | extern initcall_t __initcall_end[]; |
718 | |
719 | static initcall_t *initcall_levels[] __initdata = { |
720 | __initcall0_start, |
721 | __initcall1_start, |
722 | __initcall2_start, |
723 | __initcall3_start, |
724 | __initcall4_start, |
725 | __initcall5_start, |
726 | __initcall6_start, |
727 | __initcall7_start, |
728 | __initcall_end, |
729 | }; |
730 | |
731 | /* Keep these in sync with initcalls in include/linux/init.h */ |
732 | static char *initcall_level_names[] __initdata = { |
733 | "early", |
734 | "core", |
735 | "postcore", |
736 | "arch", |
737 | "subsys", |
738 | "fs", |
739 | "device", |
740 | "late", |
741 | }; |
742 | |
743 | static void __init do_initcall_level(int level) |
744 | { |
745 | extern const struct kernel_param __start___param[], __stop___param[]; |
746 | initcall_t *fn; |
747 | |
748 | strcpy(static_command_line, saved_command_line); |
749 | parse_args(initcall_level_names[level], |
750 | static_command_line, __start___param, |
751 | __stop___param - __start___param, |
752 | level, level, |
753 | &repair_env_string); |
754 | |
755 | for (fn = initcall_levels[level]; fn < initcall_levels[level+1]; fn++) |
756 | do_one_initcall(*fn); |
757 | } |
758 | |
759 | static void __init do_initcalls(void) |
760 | { |
761 | int level; |
762 | |
763 | for (level = 0; level < ARRAY_SIZE(initcall_levels) - 1; level++) |
764 | do_initcall_level(level); |
765 | } |
766 | |
767 | /* |
768 | * Ok, the machine is now initialized. None of the devices |
769 | * have been touched yet, but the CPU subsystem is up and |
770 | * running, and memory and process management works. |
771 | * |
772 | * Now we can finally start doing some real work.. |
773 | */ |
774 | static void __init do_basic_setup(void) |
775 | { |
776 | cpuset_init_smp(); |
777 | usermodehelper_init(); |
778 | shmem_init(); |
779 | driver_init(); |
780 | init_irq_proc(); |
781 | do_ctors(); |
782 | usermodehelper_enable(); |
783 | do_initcalls(); |
784 | random_int_secret_init(); |
785 | } |
786 | |
787 | static void __init do_pre_smp_initcalls(void) |
788 | { |
789 | initcall_t *fn; |
790 | |
791 | for (fn = __initcall_start; fn < __initcall0_start; fn++) |
792 | do_one_initcall(*fn); |
793 | } |
794 | |
795 | /* |
796 | * This function requests modules which should be loaded by default and is |
797 | * called twice right after initrd is mounted and right before init is |
798 | * exec'd. If such modules are on either initrd or rootfs, they will be |
799 | * loaded before control is passed to userland. |
800 | */ |
801 | void __init load_default_modules(void) |
802 | { |
803 | load_default_elevator_module(); |
804 | } |
805 | |
806 | static int run_init_process(const char *init_filename) |
807 | { |
808 | argv_init[0] = init_filename; |
809 | return do_execve(init_filename, |
810 | (const char __user *const __user *)argv_init, |
811 | (const char __user *const __user *)envp_init); |
812 | } |
813 | |
814 | static noinline void __init kernel_init_freeable(void); |
815 | |
816 | static int __ref kernel_init(void *unused) |
817 | { |
818 | kernel_init_freeable(); |
819 | /* need to finish all async __init code before freeing the memory */ |
820 | async_synchronize_full(); |
821 | free_initmem(); |
822 | mark_rodata_ro(); |
823 | system_state = SYSTEM_RUNNING; |
824 | numa_default_policy(); |
825 | |
826 | flush_delayed_fput(); |
827 | |
828 | if (ramdisk_execute_command) { |
829 | if (!run_init_process(ramdisk_execute_command)) |
830 | return 0; |
831 | pr_err("Failed to execute %s\n", ramdisk_execute_command); |
832 | } |
833 | |
834 | /* |
835 | * We try each of these until one succeeds. |
836 | * |
837 | * The Bourne shell can be used instead of init if we are |
838 | * trying to recover a really broken machine. |
839 | */ |
840 | if (execute_command) { |
841 | if (!run_init_process(execute_command)) |
842 | return 0; |
843 | pr_err("Failed to execute %s. Attempting defaults...\n", |
844 | execute_command); |
845 | } |
846 | if (!run_init_process("/sbin/init") || |
847 | !run_init_process("/etc/init") || |
848 | !run_init_process("/bin/init") || |
849 | !run_init_process("/bin/sh")) |
850 | return 0; |
851 | |
852 | panic("No init found. Try passing init= option to kernel. " |
853 | "See Linux Documentation/init.txt for guidance."); |
854 | } |
855 | |
856 | static noinline void __init kernel_init_freeable(void) |
857 | { |
858 | /* |
859 | * Wait until kthreadd is all set-up. |
860 | */ |
861 | wait_for_completion(&kthreadd_done); |
862 | |
863 | /* Now the scheduler is fully set up and can do blocking allocations */ |
864 | gfp_allowed_mask = __GFP_BITS_MASK; |
865 | |
866 | /* |
867 | * init can allocate pages on any node |
868 | */ |
869 | set_mems_allowed(node_states[N_MEMORY]); |
870 | /* |
871 | * init can run on any cpu. |
872 | */ |
873 | set_cpus_allowed_ptr(current, cpu_all_mask); |
874 | |
875 | cad_pid = task_pid(current); |
876 | |
877 | smp_prepare_cpus(setup_max_cpus); |
878 | |
879 | do_pre_smp_initcalls(); |
880 | lockup_detector_init(); |
881 | |
882 | smp_init(); |
883 | sched_init_smp(); |
884 | |
885 | do_basic_setup(); |
886 | |
887 | /* Open the /dev/console on the rootfs, this should never fail */ |
888 | if (sys_open((const char __user *) "/dev/console", O_RDWR, 0) < 0) |
889 | pr_err("Warning: unable to open an initial console.\n"); |
890 | |
891 | (void) sys_dup(0); |
892 | (void) sys_dup(0); |
893 | /* |
894 | * check if there is an early userspace init. If yes, let it do all |
895 | * the work |
896 | */ |
897 | |
898 | if (!ramdisk_execute_command) |
899 | ramdisk_execute_command = "/init"; |
900 | |
901 | if (sys_access((const char __user *) ramdisk_execute_command, 0) != 0) { |
902 | ramdisk_execute_command = NULL; |
903 | prepare_namespace(); |
904 | } |
905 | |
906 | /* |
907 | * Ok, we have completed the initial bootup, and |
908 | * we're essentially up and running. Get rid of the |
909 | * initmem segments and start the user-mode stuff.. |
910 | */ |
911 | |
912 | /* rootfs is available now, try loading default modules */ |
913 | load_default_modules(); |
914 | } |
915 |
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