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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 | #include <linux/types.h> |
13 | #include <linux/module.h> |
14 | #include <linux/proc_fs.h> |
15 | #include <linux/kernel.h> |
16 | #include <linux/syscalls.h> |
17 | #include <linux/stackprotector.h> |
18 | #include <linux/string.h> |
19 | #include <linux/ctype.h> |
20 | #include <linux/delay.h> |
21 | #include <linux/ioport.h> |
22 | #include <linux/init.h> |
23 | #include <linux/initrd.h> |
24 | #include <linux/bootmem.h> |
25 | #include <linux/acpi.h> |
26 | #include <linux/tty.h> |
27 | #include <linux/percpu.h> |
28 | #include <linux/kmod.h> |
29 | #include <linux/vmalloc.h> |
30 | #include <linux/kernel_stat.h> |
31 | #include <linux/start_kernel.h> |
32 | #include <linux/security.h> |
33 | #include <linux/smp.h> |
34 | #include <linux/profile.h> |
35 | #include <linux/rcupdate.h> |
36 | #include <linux/moduleparam.h> |
37 | #include <linux/kallsyms.h> |
38 | #include <linux/writeback.h> |
39 | #include <linux/cpu.h> |
40 | #include <linux/cpuset.h> |
41 | #include <linux/cgroup.h> |
42 | #include <linux/efi.h> |
43 | #include <linux/tick.h> |
44 | #include <linux/interrupt.h> |
45 | #include <linux/taskstats_kern.h> |
46 | #include <linux/delayacct.h> |
47 | #include <linux/unistd.h> |
48 | #include <linux/rmap.h> |
49 | #include <linux/mempolicy.h> |
50 | #include <linux/key.h> |
51 | #include <linux/buffer_head.h> |
52 | #include <linux/page_cgroup.h> |
53 | #include <linux/debug_locks.h> |
54 | #include <linux/debugobjects.h> |
55 | #include <linux/lockdep.h> |
56 | #include <linux/kmemleak.h> |
57 | #include <linux/pid_namespace.h> |
58 | #include <linux/device.h> |
59 | #include <linux/kthread.h> |
60 | #include <linux/sched.h> |
61 | #include <linux/signal.h> |
62 | #include <linux/idr.h> |
63 | #include <linux/kgdb.h> |
64 | #include <linux/ftrace.h> |
65 | #include <linux/async.h> |
66 | #include <linux/kmemcheck.h> |
67 | #include <linux/sfi.h> |
68 | #include <linux/shmem_fs.h> |
69 | #include <linux/slab.h> |
70 | #include <linux/perf_event.h> |
71 | #include <linux/file.h> |
72 | #include <linux/ptrace.h> |
73 | #include <linux/blkdev.h> |
74 | #include <linux/elevator.h> |
75 | |
76 | #include <asm/io.h> |
77 | #include <asm/bugs.h> |
78 | #include <asm/setup.h> |
79 | #include <asm/sections.h> |
80 | #include <asm/cacheflush.h> |
81 | |
82 | #ifdef CONFIG_X86_LOCAL_APIC |
83 | #include <asm/smp.h> |
84 | #endif |
85 | |
86 | static int kernel_init(void *); |
87 | |
88 | extern void init_IRQ(void); |
89 | extern void fork_init(unsigned long); |
90 | extern void mca_init(void); |
91 | extern void sbus_init(void); |
92 | extern void radix_tree_init(void); |
93 | #ifndef CONFIG_DEBUG_RODATA |
94 | static inline void mark_rodata_ro(void) { } |
95 | #endif |
96 | |
97 | #ifdef CONFIG_TC |
98 | extern void tc_init(void); |
99 | #endif |
100 | |
101 | /* |
102 | * Debug helper: via this flag we know that we are in 'early bootup code' |
103 | * where only the boot processor is running with IRQ disabled. This means |
104 | * two things - IRQ must not be enabled before the flag is cleared and some |
105 | * operations which are not allowed with IRQ disabled are allowed while the |
106 | * flag is set. |
107 | */ |
108 | bool early_boot_irqs_disabled __read_mostly; |
109 | |
110 | enum system_states system_state __read_mostly; |
111 | EXPORT_SYMBOL(system_state); |
112 | |
113 | /* |
114 | * Boot command-line arguments |
115 | */ |
116 | #define MAX_INIT_ARGS CONFIG_INIT_ENV_ARG_LIMIT |
117 | #define MAX_INIT_ENVS CONFIG_INIT_ENV_ARG_LIMIT |
118 | |
119 | extern void time_init(void); |
120 | /* Default late time init is NULL. archs can override this later. */ |
121 | void (*__initdata late_time_init)(void); |
122 | extern void softirq_init(void); |
123 | |
124 | /* Untouched command line saved by arch-specific code. */ |
125 | char __initdata boot_command_line[COMMAND_LINE_SIZE]; |
126 | /* Untouched saved command line (eg. for /proc) */ |
127 | char *saved_command_line; |
128 | /* Command line for parameter parsing */ |
129 | static char *static_command_line; |
130 | |
131 | static char *execute_command; |
132 | static char *ramdisk_execute_command; |
133 | |
134 | /* |
135 | * If set, this is an indication to the drivers that reset the underlying |
136 | * device before going ahead with the initialization otherwise driver might |
137 | * rely on the BIOS and skip the reset operation. |
138 | * |
139 | * This is useful if kernel is booting in an unreliable environment. |
140 | * For ex. kdump situaiton where previous kernel has crashed, BIOS has been |
141 | * skipped and devices will be in unknown state. |
142 | */ |
143 | unsigned int reset_devices; |
144 | EXPORT_SYMBOL(reset_devices); |
145 | |
146 | static int __init set_reset_devices(char *str) |
147 | { |
148 | reset_devices = 1; |
149 | return 1; |
150 | } |
151 | |
152 | __setup("reset_devices", set_reset_devices); |
153 | |
154 | static const char * argv_init[MAX_INIT_ARGS+2] = { "init", NULL, }; |
155 | const char * envp_init[MAX_INIT_ENVS+2] = { "HOME=/", "TERM=linux", NULL, }; |
156 | static const char *panic_later, *panic_param; |
157 | |
158 | extern const struct obs_kernel_param __setup_start[], __setup_end[]; |
159 | |
160 | static int __init obsolete_checksetup(char *line) |
161 | { |
162 | const struct obs_kernel_param *p; |
163 | int had_early_param = 0; |
164 | |
165 | p = __setup_start; |
166 | do { |
167 | int n = strlen(p->str); |
168 | if (parameqn(line, p->str, n)) { |
169 | if (p->early) { |
170 | /* Already done in parse_early_param? |
171 | * (Needs exact match on param part). |
172 | * Keep iterating, as we can have early |
173 | * params and __setups of same names 8( */ |
174 | if (line[n] == '\0' || line[n] == '=') |
175 | had_early_param = 1; |
176 | } else if (!p->setup_func) { |
177 | printk(KERN_WARNING "Parameter %s is obsolete," |
178 | " ignored\n", p->str); |
179 | return 1; |
180 | } else if (p->setup_func(line + n)) |
181 | return 1; |
182 | } |
183 | p++; |
184 | } while (p < __setup_end); |
185 | |
186 | return had_early_param; |
187 | } |
188 | |
189 | /* |
190 | * This should be approx 2 Bo*oMips to start (note initial shift), and will |
191 | * still work even if initially too large, it will just take slightly longer |
192 | */ |
193 | unsigned long loops_per_jiffy = (1<<12); |
194 | |
195 | EXPORT_SYMBOL(loops_per_jiffy); |
196 | |
197 | static int __init debug_kernel(char *str) |
198 | { |
199 | console_loglevel = 10; |
200 | return 0; |
201 | } |
202 | |
203 | static int __init quiet_kernel(char *str) |
204 | { |
205 | console_loglevel = 4; |
206 | return 0; |
207 | } |
208 | |
209 | early_param("debug", debug_kernel); |
210 | early_param("quiet", quiet_kernel); |
211 | |
212 | static int __init loglevel(char *str) |
213 | { |
214 | int newlevel; |
215 | |
216 | /* |
217 | * Only update loglevel value when a correct setting was passed, |
218 | * to prevent blind crashes (when loglevel being set to 0) that |
219 | * are quite hard to debug |
220 | */ |
221 | if (get_option(&str, &newlevel)) { |
222 | console_loglevel = newlevel; |
223 | return 0; |
224 | } |
225 | |
226 | return -EINVAL; |
227 | } |
228 | |
229 | early_param("loglevel", loglevel); |
230 | |
231 | /* Change NUL term back to "=", to make "param" the whole string. */ |
232 | static int __init repair_env_string(char *param, char *val, const char *unused) |
233 | { |
234 | if (val) { |
235 | /* param=val or param="val"? */ |
236 | if (val == param+strlen(param)+1) |
237 | val[-1] = '='; |
238 | else if (val == param+strlen(param)+2) { |
239 | val[-2] = '='; |
240 | memmove(val-1, val, strlen(val)+1); |
241 | val--; |
242 | } else |
243 | BUG(); |
244 | } |
245 | return 0; |
246 | } |
247 | |
248 | /* |
249 | * Unknown boot options get handed to init, unless they look like |
250 | * unused parameters (modprobe will find them in /proc/cmdline). |
251 | */ |
252 | static int __init unknown_bootoption(char *param, char *val, const char *unused) |
253 | { |
254 | repair_env_string(param, val, unused); |
255 | |
256 | /* Handle obsolete-style parameters */ |
257 | if (obsolete_checksetup(param)) |
258 | return 0; |
259 | |
260 | /* Unused module parameter. */ |
261 | if (strchr(param, '.') && (!val || strchr(param, '.') < val)) |
262 | return 0; |
263 | |
264 | if (panic_later) |
265 | return 0; |
266 | |
267 | if (val) { |
268 | /* Environment option */ |
269 | unsigned int i; |
270 | for (i = 0; envp_init[i]; i++) { |
271 | if (i == MAX_INIT_ENVS) { |
272 | panic_later = "Too many boot env vars at `%s'"; |
273 | panic_param = param; |
274 | } |
275 | if (!strncmp(param, envp_init[i], val - param)) |
276 | break; |
277 | } |
278 | envp_init[i] = param; |
279 | } else { |
280 | /* Command line option */ |
281 | unsigned int i; |
282 | for (i = 0; argv_init[i]; i++) { |
283 | if (i == MAX_INIT_ARGS) { |
284 | panic_later = "Too many boot init vars at `%s'"; |
285 | panic_param = param; |
286 | } |
287 | } |
288 | argv_init[i] = param; |
289 | } |
290 | return 0; |
291 | } |
292 | |
293 | static int __init init_setup(char *str) |
294 | { |
295 | unsigned int i; |
296 | |
297 | execute_command = str; |
298 | /* |
299 | * In case LILO is going to boot us with default command line, |
300 | * it prepends "auto" before the whole cmdline which makes |
301 | * the shell think it should execute a script with such name. |
302 | * So we ignore all arguments entered _before_ init=... [MJ] |
303 | */ |
304 | for (i = 1; i < MAX_INIT_ARGS; i++) |
305 | argv_init[i] = NULL; |
306 | return 1; |
307 | } |
308 | __setup("init=", init_setup); |
309 | |
310 | static int __init rdinit_setup(char *str) |
311 | { |
312 | unsigned int i; |
313 | |
314 | ramdisk_execute_command = str; |
315 | /* See "auto" comment in init_setup */ |
316 | for (i = 1; i < MAX_INIT_ARGS; i++) |
317 | argv_init[i] = NULL; |
318 | return 1; |
319 | } |
320 | __setup("rdinit=", rdinit_setup); |
321 | |
322 | #ifndef CONFIG_SMP |
323 | static const unsigned int setup_max_cpus = NR_CPUS; |
324 | #ifdef CONFIG_X86_LOCAL_APIC |
325 | static void __init smp_init(void) |
326 | { |
327 | APIC_init_uniprocessor(); |
328 | } |
329 | #else |
330 | #define smp_init() do { } while (0) |
331 | #endif |
332 | |
333 | static inline void setup_nr_cpu_ids(void) { } |
334 | static inline void smp_prepare_cpus(unsigned int maxcpus) { } |
335 | #endif |
336 | |
337 | /* |
338 | * We need to store the untouched command line for future reference. |
339 | * We also need to store the touched command line since the parameter |
340 | * parsing is performed in place, and we should allow a component to |
341 | * store reference of name/value for future reference. |
342 | */ |
343 | static void __init setup_command_line(char *command_line) |
344 | { |
345 | saved_command_line = alloc_bootmem(strlen (boot_command_line)+1); |
346 | static_command_line = alloc_bootmem(strlen (command_line)+1); |
347 | strcpy (saved_command_line, boot_command_line); |
348 | strcpy (static_command_line, command_line); |
349 | } |
350 | |
351 | /* |
352 | * We need to finalize in a non-__init function or else race conditions |
353 | * between the root thread and the init thread may cause start_kernel to |
354 | * be reaped by free_initmem before the root thread has proceeded to |
355 | * cpu_idle. |
356 | * |
357 | * gcc-3.4 accidentally inlines this function, so use noinline. |
358 | */ |
359 | |
360 | static __initdata DECLARE_COMPLETION(kthreadd_done); |
361 | |
362 | static noinline void __init_refok rest_init(void) |
363 | { |
364 | int pid; |
365 | |
366 | rcu_scheduler_starting(); |
367 | /* |
368 | * We need to spawn init first so that it obtains pid 1, however |
369 | * the init task will end up wanting to create kthreads, which, if |
370 | * we schedule it before we create kthreadd, will OOPS. |
371 | */ |
372 | kernel_thread(kernel_init, NULL, CLONE_FS | CLONE_SIGHAND); |
373 | numa_default_policy(); |
374 | pid = kernel_thread(kthreadd, NULL, CLONE_FS | CLONE_FILES); |
375 | rcu_read_lock(); |
376 | kthreadd_task = find_task_by_pid_ns(pid, &init_pid_ns); |
377 | rcu_read_unlock(); |
378 | complete(&kthreadd_done); |
379 | |
380 | /* |
381 | * The boot idle thread must execute schedule() |
382 | * at least once to get things moving: |
383 | */ |
384 | init_idle_bootup_task(current); |
385 | schedule_preempt_disabled(); |
386 | /* Call into cpu_idle with preempt disabled */ |
387 | cpu_idle(); |
388 | } |
389 | |
390 | /* Check for early params. */ |
391 | static int __init do_early_param(char *param, char *val, const char *unused) |
392 | { |
393 | const struct obs_kernel_param *p; |
394 | |
395 | for (p = __setup_start; p < __setup_end; p++) { |
396 | if ((p->early && parameq(param, p->str)) || |
397 | (strcmp(param, "console") == 0 && |
398 | strcmp(p->str, "earlycon") == 0) |
399 | ) { |
400 | if (p->setup_func(val) != 0) |
401 | printk(KERN_WARNING |
402 | "Malformed early option '%s'\n", param); |
403 | } |
404 | } |
405 | /* We accept everything at this stage. */ |
406 | return 0; |
407 | } |
408 | |
409 | void __init parse_early_options(char *cmdline) |
410 | { |
411 | parse_args("early options", cmdline, NULL, 0, 0, 0, do_early_param); |
412 | } |
413 | |
414 | /* Arch code calls this early on, or if not, just before other parsing. */ |
415 | void __init parse_early_param(void) |
416 | { |
417 | static __initdata int done = 0; |
418 | static __initdata char tmp_cmdline[COMMAND_LINE_SIZE]; |
419 | |
420 | if (done) |
421 | return; |
422 | |
423 | /* All fall through to do_early_param. */ |
424 | strlcpy(tmp_cmdline, boot_command_line, COMMAND_LINE_SIZE); |
425 | parse_early_options(tmp_cmdline); |
426 | done = 1; |
427 | } |
428 | |
429 | /* |
430 | * Activate the first processor. |
431 | */ |
432 | |
433 | static void __init boot_cpu_init(void) |
434 | { |
435 | int cpu = smp_processor_id(); |
436 | /* Mark the boot cpu "present", "online" etc for SMP and UP case */ |
437 | set_cpu_online(cpu, true); |
438 | set_cpu_active(cpu, true); |
439 | set_cpu_present(cpu, true); |
440 | set_cpu_possible(cpu, true); |
441 | } |
442 | |
443 | void __init __weak smp_setup_processor_id(void) |
444 | { |
445 | } |
446 | |
447 | # if THREAD_SIZE >= PAGE_SIZE |
448 | void __init __weak thread_info_cache_init(void) |
449 | { |
450 | } |
451 | #endif |
452 | |
453 | /* |
454 | * Set up kernel memory allocators |
455 | */ |
456 | static void __init mm_init(void) |
457 | { |
458 | /* |
459 | * page_cgroup requires contiguous pages, |
460 | * bigger than MAX_ORDER unless SPARSEMEM. |
461 | */ |
462 | page_cgroup_init_flatmem(); |
463 | mem_init(); |
464 | kmem_cache_init(); |
465 | percpu_init_late(); |
466 | pgtable_cache_init(); |
467 | vmalloc_init(); |
468 | } |
469 | |
470 | asmlinkage void __init start_kernel(void) |
471 | { |
472 | char * command_line; |
473 | extern const struct kernel_param __start___param[], __stop___param[]; |
474 | |
475 | /* |
476 | * Need to run as early as possible, to initialize the |
477 | * lockdep hash: |
478 | */ |
479 | lockdep_init(); |
480 | smp_setup_processor_id(); |
481 | debug_objects_early_init(); |
482 | |
483 | /* |
484 | * Set up the the initial canary ASAP: |
485 | */ |
486 | boot_init_stack_canary(); |
487 | |
488 | cgroup_init_early(); |
489 | |
490 | local_irq_disable(); |
491 | early_boot_irqs_disabled = true; |
492 | |
493 | /* |
494 | * Interrupts are still disabled. Do necessary setups, then |
495 | * enable them |
496 | */ |
497 | tick_init(); |
498 | boot_cpu_init(); |
499 | page_address_init(); |
500 | printk(KERN_NOTICE "%s", linux_banner); |
501 | setup_arch(&command_line); |
502 | mm_init_owner(&init_mm, &init_task); |
503 | mm_init_cpumask(&init_mm); |
504 | setup_command_line(command_line); |
505 | setup_nr_cpu_ids(); |
506 | setup_per_cpu_areas(); |
507 | smp_prepare_boot_cpu(); /* arch-specific boot-cpu hooks */ |
508 | |
509 | build_all_zonelists(NULL, NULL); |
510 | page_alloc_init(); |
511 | |
512 | printk(KERN_NOTICE "Kernel command line: %s\n", boot_command_line); |
513 | parse_early_param(); |
514 | parse_args("Booting kernel", static_command_line, __start___param, |
515 | __stop___param - __start___param, |
516 | -1, -1, &unknown_bootoption); |
517 | |
518 | jump_label_init(); |
519 | |
520 | /* |
521 | * These use large bootmem allocations and must precede |
522 | * kmem_cache_init() |
523 | */ |
524 | setup_log_buf(0); |
525 | pidhash_init(); |
526 | vfs_caches_init_early(); |
527 | sort_main_extable(); |
528 | trap_init(); |
529 | mm_init(); |
530 | |
531 | /* |
532 | * Set up the scheduler prior starting any interrupts (such as the |
533 | * timer interrupt). Full topology setup happens at smp_init() |
534 | * time - but meanwhile we still have a functioning scheduler. |
535 | */ |
536 | sched_init(); |
537 | /* |
538 | * Disable preemption - early bootup scheduling is extremely |
539 | * fragile until we cpu_idle() for the first time. |
540 | */ |
541 | preempt_disable(); |
542 | if (!irqs_disabled()) { |
543 | printk(KERN_WARNING "start_kernel(): bug: interrupts were " |
544 | "enabled *very* early, fixing it\n"); |
545 | local_irq_disable(); |
546 | } |
547 | idr_init_cache(); |
548 | perf_event_init(); |
549 | rcu_init(); |
550 | radix_tree_init(); |
551 | /* init some links before init_ISA_irqs() */ |
552 | early_irq_init(); |
553 | init_IRQ(); |
554 | init_timers(); |
555 | hrtimers_init(); |
556 | softirq_init(); |
557 | timekeeping_init(); |
558 | time_init(); |
559 | profile_init(); |
560 | call_function_init(); |
561 | if (!irqs_disabled()) |
562 | printk(KERN_CRIT "start_kernel(): bug: interrupts were " |
563 | "enabled early\n"); |
564 | early_boot_irqs_disabled = false; |
565 | local_irq_enable(); |
566 | |
567 | kmem_cache_init_late(); |
568 | |
569 | /* |
570 | * HACK ALERT! This is early. We're enabling the console before |
571 | * we've done PCI setups etc, and console_init() must be aware of |
572 | * this. But we do want output early, in case something goes wrong. |
573 | */ |
574 | console_init(); |
575 | if (panic_later) |
576 | panic(panic_later, panic_param); |
577 | |
578 | lockdep_info(); |
579 | |
580 | /* |
581 | * Need to run this when irqs are enabled, because it wants |
582 | * to self-test [hard/soft]-irqs on/off lock inversion bugs |
583 | * too: |
584 | */ |
585 | locking_selftest(); |
586 | |
587 | #ifdef CONFIG_BLK_DEV_INITRD |
588 | if (initrd_start && !initrd_below_start_ok && |
589 | page_to_pfn(virt_to_page((void *)initrd_start)) < min_low_pfn) { |
590 | printk(KERN_CRIT "initrd overwritten (0x%08lx < 0x%08lx) - " |
591 | "disabling it.\n", |
592 | page_to_pfn(virt_to_page((void *)initrd_start)), |
593 | min_low_pfn); |
594 | initrd_start = 0; |
595 | } |
596 | #endif |
597 | page_cgroup_init(); |
598 | debug_objects_mem_init(); |
599 | kmemleak_init(); |
600 | setup_per_cpu_pageset(); |
601 | numa_policy_init(); |
602 | if (late_time_init) |
603 | late_time_init(); |
604 | sched_clock_init(); |
605 | calibrate_delay(); |
606 | pidmap_init(); |
607 | anon_vma_init(); |
608 | #ifdef CONFIG_X86 |
609 | if (efi_enabled(EFI_RUNTIME_SERVICES)) |
610 | efi_enter_virtual_mode(); |
611 | #endif |
612 | thread_info_cache_init(); |
613 | cred_init(); |
614 | fork_init(totalram_pages); |
615 | proc_caches_init(); |
616 | buffer_init(); |
617 | key_init(); |
618 | security_init(); |
619 | dbg_late_init(); |
620 | vfs_caches_init(totalram_pages); |
621 | signals_init(); |
622 | /* rootfs populating might need page-writeback */ |
623 | page_writeback_init(); |
624 | #ifdef CONFIG_PROC_FS |
625 | proc_root_init(); |
626 | #endif |
627 | cgroup_init(); |
628 | cpuset_init(); |
629 | taskstats_init_early(); |
630 | delayacct_init(); |
631 | |
632 | check_bugs(); |
633 | |
634 | acpi_early_init(); /* before LAPIC and SMP init */ |
635 | sfi_init_late(); |
636 | |
637 | if (efi_enabled(EFI_RUNTIME_SERVICES)) { |
638 | efi_late_init(); |
639 | efi_free_boot_services(); |
640 | } |
641 | |
642 | ftrace_init(); |
643 | |
644 | /* Do the rest non-__init'ed, we're now alive */ |
645 | rest_init(); |
646 | } |
647 | |
648 | /* Call all constructor functions linked into the kernel. */ |
649 | static void __init do_ctors(void) |
650 | { |
651 | #ifdef CONFIG_CONSTRUCTORS |
652 | ctor_fn_t *fn = (ctor_fn_t *) __ctors_start; |
653 | |
654 | for (; fn < (ctor_fn_t *) __ctors_end; fn++) |
655 | (*fn)(); |
656 | #endif |
657 | } |
658 | |
659 | bool initcall_debug; |
660 | core_param(initcall_debug, initcall_debug, bool, 0644); |
661 | |
662 | static char msgbuf[64]; |
663 | |
664 | static int __init_or_module do_one_initcall_debug(initcall_t fn) |
665 | { |
666 | ktime_t calltime, delta, rettime; |
667 | unsigned long long duration; |
668 | int ret; |
669 | |
670 | printk(KERN_DEBUG "calling %pF @ %i\n", fn, task_pid_nr(current)); |
671 | calltime = ktime_get(); |
672 | ret = fn(); |
673 | rettime = ktime_get(); |
674 | delta = ktime_sub(rettime, calltime); |
675 | duration = (unsigned long long) ktime_to_ns(delta) >> 10; |
676 | printk(KERN_DEBUG "initcall %pF returned %d after %lld usecs\n", fn, |
677 | ret, duration); |
678 | |
679 | return ret; |
680 | } |
681 | |
682 | int __init_or_module do_one_initcall(initcall_t fn) |
683 | { |
684 | int count = preempt_count(); |
685 | int ret; |
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 (ret && ret != -ENODEV && initcall_debug) |
695 | sprintf(msgbuf, "error code %d ", ret); |
696 | |
697 | if (preempt_count() != count) { |
698 | strlcat(msgbuf, "preemption imbalance ", sizeof(msgbuf)); |
699 | preempt_count() = count; |
700 | } |
701 | if (irqs_disabled()) { |
702 | strlcat(msgbuf, "disabled interrupts ", sizeof(msgbuf)); |
703 | local_irq_enable(); |
704 | } |
705 | if (msgbuf[0]) { |
706 | printk("initcall %pF returned with %s\n", fn, msgbuf); |
707 | } |
708 | |
709 | return ret; |
710 | } |
711 | |
712 | |
713 | extern initcall_t __initcall_start[]; |
714 | extern initcall_t __initcall0_start[]; |
715 | extern initcall_t __initcall1_start[]; |
716 | extern initcall_t __initcall2_start[]; |
717 | extern initcall_t __initcall3_start[]; |
718 | extern initcall_t __initcall4_start[]; |
719 | extern initcall_t __initcall5_start[]; |
720 | extern initcall_t __initcall6_start[]; |
721 | extern initcall_t __initcall7_start[]; |
722 | extern initcall_t __initcall_end[]; |
723 | |
724 | static initcall_t *initcall_levels[] __initdata = { |
725 | __initcall0_start, |
726 | __initcall1_start, |
727 | __initcall2_start, |
728 | __initcall3_start, |
729 | __initcall4_start, |
730 | __initcall5_start, |
731 | __initcall6_start, |
732 | __initcall7_start, |
733 | __initcall_end, |
734 | }; |
735 | |
736 | /* Keep these in sync with initcalls in include/linux/init.h */ |
737 | static char *initcall_level_names[] __initdata = { |
738 | "early", |
739 | "core", |
740 | "postcore", |
741 | "arch", |
742 | "subsys", |
743 | "fs", |
744 | "device", |
745 | "late", |
746 | }; |
747 | |
748 | static void __init do_initcall_level(int level) |
749 | { |
750 | extern const struct kernel_param __start___param[], __stop___param[]; |
751 | initcall_t *fn; |
752 | |
753 | strcpy(static_command_line, saved_command_line); |
754 | parse_args(initcall_level_names[level], |
755 | static_command_line, __start___param, |
756 | __stop___param - __start___param, |
757 | level, level, |
758 | &repair_env_string); |
759 | |
760 | for (fn = initcall_levels[level]; fn < initcall_levels[level+1]; fn++) |
761 | do_one_initcall(*fn); |
762 | } |
763 | |
764 | static void __init do_initcalls(void) |
765 | { |
766 | int level; |
767 | |
768 | for (level = 0; level < ARRAY_SIZE(initcall_levels) - 1; level++) |
769 | do_initcall_level(level); |
770 | } |
771 | |
772 | /* |
773 | * Ok, the machine is now initialized. None of the devices |
774 | * have been touched yet, but the CPU subsystem is up and |
775 | * running, and memory and process management works. |
776 | * |
777 | * Now we can finally start doing some real work.. |
778 | */ |
779 | static void __init do_basic_setup(void) |
780 | { |
781 | cpuset_init_smp(); |
782 | usermodehelper_init(); |
783 | shmem_init(); |
784 | driver_init(); |
785 | init_irq_proc(); |
786 | do_ctors(); |
787 | usermodehelper_enable(); |
788 | do_initcalls(); |
789 | } |
790 | |
791 | static void __init do_pre_smp_initcalls(void) |
792 | { |
793 | initcall_t *fn; |
794 | |
795 | for (fn = __initcall_start; fn < __initcall0_start; fn++) |
796 | do_one_initcall(*fn); |
797 | } |
798 | |
799 | /* |
800 | * This function requests modules which should be loaded by default and is |
801 | * called twice right after initrd is mounted and right before init is |
802 | * exec'd. If such modules are on either initrd or rootfs, they will be |
803 | * loaded before control is passed to userland. |
804 | */ |
805 | void __init load_default_modules(void) |
806 | { |
807 | load_default_elevator_module(); |
808 | } |
809 | |
810 | static int run_init_process(const char *init_filename) |
811 | { |
812 | argv_init[0] = init_filename; |
813 | return do_execve(init_filename, |
814 | (const char __user *const __user *)argv_init, |
815 | (const char __user *const __user *)envp_init); |
816 | } |
817 | |
818 | static noinline void __init kernel_init_freeable(void); |
819 | |
820 | static int __ref kernel_init(void *unused) |
821 | { |
822 | kernel_init_freeable(); |
823 | /* need to finish all async __init code before freeing the memory */ |
824 | async_synchronize_full(); |
825 | free_initmem(); |
826 | mark_rodata_ro(); |
827 | system_state = SYSTEM_RUNNING; |
828 | numa_default_policy(); |
829 | |
830 | flush_delayed_fput(); |
831 | |
832 | if (ramdisk_execute_command) { |
833 | if (!run_init_process(ramdisk_execute_command)) |
834 | return 0; |
835 | printk(KERN_WARNING "Failed to execute %s\n", |
836 | ramdisk_execute_command); |
837 | } |
838 | |
839 | /* |
840 | * We try each of these until one succeeds. |
841 | * |
842 | * The Bourne shell can be used instead of init if we are |
843 | * trying to recover a really broken machine. |
844 | */ |
845 | if (execute_command) { |
846 | if (!run_init_process(execute_command)) |
847 | return 0; |
848 | printk(KERN_WARNING "Failed to execute %s. Attempting " |
849 | "defaults...\n", execute_command); |
850 | } |
851 | if (!run_init_process("/sbin/init") || |
852 | !run_init_process("/etc/init") || |
853 | !run_init_process("/bin/init") || |
854 | !run_init_process("/bin/sh")) |
855 | return 0; |
856 | |
857 | panic("No init found. Try passing init= option to kernel. " |
858 | "See Linux Documentation/init.txt for guidance."); |
859 | } |
860 | |
861 | static noinline void __init kernel_init_freeable(void) |
862 | { |
863 | /* |
864 | * Wait until kthreadd is all set-up. |
865 | */ |
866 | wait_for_completion(&kthreadd_done); |
867 | |
868 | /* Now the scheduler is fully set up and can do blocking allocations */ |
869 | gfp_allowed_mask = __GFP_BITS_MASK; |
870 | |
871 | /* |
872 | * init can allocate pages on any node |
873 | */ |
874 | set_mems_allowed(node_states[N_MEMORY]); |
875 | /* |
876 | * init can run on any cpu. |
877 | */ |
878 | set_cpus_allowed_ptr(current, cpu_all_mask); |
879 | |
880 | cad_pid = task_pid(current); |
881 | |
882 | smp_prepare_cpus(setup_max_cpus); |
883 | |
884 | do_pre_smp_initcalls(); |
885 | lockup_detector_init(); |
886 | |
887 | smp_init(); |
888 | sched_init_smp(); |
889 | |
890 | do_basic_setup(); |
891 | |
892 | /* Open the /dev/console on the rootfs, this should never fail */ |
893 | if (sys_open((const char __user *) "/dev/console", O_RDWR, 0) < 0) |
894 | printk(KERN_WARNING "Warning: unable to open an initial console.\n"); |
895 | |
896 | (void) sys_dup(0); |
897 | (void) sys_dup(0); |
898 | /* |
899 | * check if there is an early userspace init. If yes, let it do all |
900 | * the work |
901 | */ |
902 | |
903 | if (!ramdisk_execute_command) |
904 | ramdisk_execute_command = "/init"; |
905 | |
906 | if (sys_access((const char __user *) ramdisk_execute_command, 0) != 0) { |
907 | ramdisk_execute_command = NULL; |
908 | prepare_namespace(); |
909 | } |
910 | |
911 | /* |
912 | * Ok, we have completed the initial bootup, and |
913 | * we're essentially up and running. Get rid of the |
914 | * initmem segments and start the user-mode stuff.. |
915 | */ |
916 | |
917 | /* rootfs is available now, try loading default modules */ |
918 | load_default_modules(); |
919 | } |
920 |
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