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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/smp_lock.h> | |
24 | #include <linux/initrd.h> | |
25 | #include <linux/bootmem.h> | |
26 | #include <linux/acpi.h> | |
27 | #include <linux/tty.h> | |
28 | #include <linux/percpu.h> | |
29 | #include <linux/kmod.h> | |
30 | #include <linux/vmalloc.h> | |
31 | #include <linux/kernel_stat.h> | |
32 | #include <linux/start_kernel.h> | |
33 | #include <linux/security.h> | |
34 | #include <linux/smp.h> | |
35 | #include <linux/workqueue.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/kmemtrace.h> | |
70 | #include <linux/sfi.h> | |
71 | #include <linux/shmem_fs.h> | |
72 | #include <linux/slab.h> | |
73 | #include <trace/boot.h> | |
74 | ||
75 | #include <asm/io.h> | |
76 | #include <asm/bugs.h> | |
77 | #include <asm/setup.h> | |
78 | #include <asm/sections.h> | |
79 | #include <asm/cacheflush.h> | |
80 | ||
81 | #ifdef CONFIG_X86_LOCAL_APIC | |
82 | #include <asm/smp.h> | |
83 | #endif | |
84 | ||
85 | static int kernel_init(void *); | |
86 | ||
87 | extern void init_IRQ(void); | |
88 | extern void fork_init(unsigned long); | |
89 | extern void mca_init(void); | |
90 | extern void sbus_init(void); | |
91 | extern void prio_tree_init(void); | |
92 | extern void radix_tree_init(void); | |
93 | extern void free_initmem(void); | |
94 | #ifndef CONFIG_DEBUG_RODATA | |
95 | static inline void mark_rodata_ro(void) { } | |
96 | #endif | |
97 | ||
98 | #ifdef CONFIG_TC | |
99 | extern void tc_init(void); | |
100 | #endif | |
101 | ||
102 | enum system_states system_state __read_mostly; | |
103 | EXPORT_SYMBOL(system_state); | |
104 | ||
105 | /* | |
106 | * Boot command-line arguments | |
107 | */ | |
108 | #define MAX_INIT_ARGS CONFIG_INIT_ENV_ARG_LIMIT | |
109 | #define MAX_INIT_ENVS CONFIG_INIT_ENV_ARG_LIMIT | |
110 | ||
111 | extern void time_init(void); | |
112 | /* Default late time init is NULL. archs can override this later. */ | |
113 | void (*__initdata late_time_init)(void); | |
114 | extern void softirq_init(void); | |
115 | ||
116 | /* Untouched command line saved by arch-specific code. */ | |
117 | char __initdata boot_command_line[COMMAND_LINE_SIZE]; | |
118 | /* Untouched saved command line (eg. for /proc) */ | |
119 | char *saved_command_line; | |
120 | /* Command line for parameter parsing */ | |
121 | static char *static_command_line; | |
122 | ||
123 | static char *execute_command; | |
124 | static char *ramdisk_execute_command; | |
125 | ||
126 | #ifdef CONFIG_SMP | |
127 | /* Setup configured maximum number of CPUs to activate */ | |
128 | unsigned int setup_max_cpus = NR_CPUS; | |
129 | EXPORT_SYMBOL(setup_max_cpus); | |
130 | ||
131 | ||
132 | /* | |
133 | * Setup routine for controlling SMP activation | |
134 | * | |
135 | * Command-line option of "nosmp" or "maxcpus=0" will disable SMP | |
136 | * activation entirely (the MPS table probe still happens, though). | |
137 | * | |
138 | * Command-line option of "maxcpus=<NUM>", where <NUM> is an integer | |
139 | * greater than 0, limits the maximum number of CPUs activated in | |
140 | * SMP mode to <NUM>. | |
141 | */ | |
142 | ||
143 | void __weak arch_disable_smp_support(void) { } | |
144 | ||
145 | static int __init nosmp(char *str) | |
146 | { | |
147 | setup_max_cpus = 0; | |
148 | arch_disable_smp_support(); | |
149 | ||
150 | return 0; | |
151 | } | |
152 | ||
153 | early_param("nosmp", nosmp); | |
154 | ||
155 | /* this is hard limit */ | |
156 | static int __init nrcpus(char *str) | |
157 | { | |
158 | int nr_cpus; | |
159 | ||
160 | get_option(&str, &nr_cpus); | |
161 | if (nr_cpus > 0 && nr_cpus < nr_cpu_ids) | |
162 | nr_cpu_ids = nr_cpus; | |
163 | ||
164 | return 0; | |
165 | } | |
166 | ||
167 | early_param("nr_cpus", nrcpus); | |
168 | ||
169 | static int __init maxcpus(char *str) | |
170 | { | |
171 | get_option(&str, &setup_max_cpus); | |
172 | if (setup_max_cpus == 0) | |
173 | arch_disable_smp_support(); | |
174 | ||
175 | return 0; | |
176 | } | |
177 | ||
178 | early_param("maxcpus", maxcpus); | |
179 | #else | |
180 | static const unsigned int setup_max_cpus = NR_CPUS; | |
181 | #endif | |
182 | ||
183 | /* | |
184 | * If set, this is an indication to the drivers that reset the underlying | |
185 | * device before going ahead with the initialization otherwise driver might | |
186 | * rely on the BIOS and skip the reset operation. | |
187 | * | |
188 | * This is useful if kernel is booting in an unreliable environment. | |
189 | * For ex. kdump situaiton where previous kernel has crashed, BIOS has been | |
190 | * skipped and devices will be in unknown state. | |
191 | */ | |
192 | unsigned int reset_devices; | |
193 | EXPORT_SYMBOL(reset_devices); | |
194 | ||
195 | static int __init set_reset_devices(char *str) | |
196 | { | |
197 | reset_devices = 1; | |
198 | return 1; | |
199 | } | |
200 | ||
201 | __setup("reset_devices", set_reset_devices); | |
202 | ||
203 | static char * argv_init[MAX_INIT_ARGS+2] = { "init", NULL, }; | |
204 | char * envp_init[MAX_INIT_ENVS+2] = { "HOME=/", "TERM=linux", NULL, }; | |
205 | static const char *panic_later, *panic_param; | |
206 | ||
207 | extern struct obs_kernel_param __setup_start[], __setup_end[]; | |
208 | ||
209 | static int __init obsolete_checksetup(char *line) | |
210 | { | |
211 | struct obs_kernel_param *p; | |
212 | int had_early_param = 0; | |
213 | ||
214 | p = __setup_start; | |
215 | do { | |
216 | int n = strlen(p->str); | |
217 | if (!strncmp(line, p->str, n)) { | |
218 | if (p->early) { | |
219 | /* Already done in parse_early_param? | |
220 | * (Needs exact match on param part). | |
221 | * Keep iterating, as we can have early | |
222 | * params and __setups of same names 8( */ | |
223 | if (line[n] == '\0' || line[n] == '=') | |
224 | had_early_param = 1; | |
225 | } else if (!p->setup_func) { | |
226 | printk(KERN_WARNING "Parameter %s is obsolete," | |
227 | " ignored\n", p->str); | |
228 | return 1; | |
229 | } else if (p->setup_func(line + n)) | |
230 | return 1; | |
231 | } | |
232 | p++; | |
233 | } while (p < __setup_end); | |
234 | ||
235 | return had_early_param; | |
236 | } | |
237 | ||
238 | /* | |
239 | * This should be approx 2 Bo*oMips to start (note initial shift), and will | |
240 | * still work even if initially too large, it will just take slightly longer | |
241 | */ | |
242 | unsigned long loops_per_jiffy = (1<<12); | |
243 | ||
244 | EXPORT_SYMBOL(loops_per_jiffy); | |
245 | ||
246 | static int __init debug_kernel(char *str) | |
247 | { | |
248 | console_loglevel = 10; | |
249 | return 0; | |
250 | } | |
251 | ||
252 | static int __init quiet_kernel(char *str) | |
253 | { | |
254 | console_loglevel = 4; | |
255 | return 0; | |
256 | } | |
257 | ||
258 | early_param("debug", debug_kernel); | |
259 | early_param("quiet", quiet_kernel); | |
260 | ||
261 | static int __init loglevel(char *str) | |
262 | { | |
263 | get_option(&str, &console_loglevel); | |
264 | return 0; | |
265 | } | |
266 | ||
267 | early_param("loglevel", loglevel); | |
268 | ||
269 | /* | |
270 | * Unknown boot options get handed to init, unless they look like | |
271 | * unused parameters (modprobe will find them in /proc/cmdline). | |
272 | */ | |
273 | static int __init unknown_bootoption(char *param, char *val) | |
274 | { | |
275 | /* Change NUL term back to "=", to make "param" the whole string. */ | |
276 | if (val) { | |
277 | /* param=val or param="val"? */ | |
278 | if (val == param+strlen(param)+1) | |
279 | val[-1] = '='; | |
280 | else if (val == param+strlen(param)+2) { | |
281 | val[-2] = '='; | |
282 | memmove(val-1, val, strlen(val)+1); | |
283 | val--; | |
284 | } else | |
285 | BUG(); | |
286 | } | |
287 | ||
288 | /* Handle obsolete-style parameters */ | |
289 | if (obsolete_checksetup(param)) | |
290 | return 0; | |
291 | ||
292 | /* Unused module parameter. */ | |
293 | if (strchr(param, '.') && (!val || strchr(param, '.') < val)) | |
294 | return 0; | |
295 | ||
296 | if (panic_later) | |
297 | return 0; | |
298 | ||
299 | if (val) { | |
300 | /* Environment option */ | |
301 | unsigned int i; | |
302 | for (i = 0; envp_init[i]; i++) { | |
303 | if (i == MAX_INIT_ENVS) { | |
304 | panic_later = "Too many boot env vars at `%s'"; | |
305 | panic_param = param; | |
306 | } | |
307 | if (!strncmp(param, envp_init[i], val - param)) | |
308 | break; | |
309 | } | |
310 | envp_init[i] = param; | |
311 | } else { | |
312 | /* Command line option */ | |
313 | unsigned int i; | |
314 | for (i = 0; argv_init[i]; i++) { | |
315 | if (i == MAX_INIT_ARGS) { | |
316 | panic_later = "Too many boot init vars at `%s'"; | |
317 | panic_param = param; | |
318 | } | |
319 | } | |
320 | argv_init[i] = param; | |
321 | } | |
322 | return 0; | |
323 | } | |
324 | ||
325 | #ifdef CONFIG_DEBUG_PAGEALLOC | |
326 | int __read_mostly debug_pagealloc_enabled = 0; | |
327 | #endif | |
328 | ||
329 | static int __init init_setup(char *str) | |
330 | { | |
331 | unsigned int i; | |
332 | ||
333 | execute_command = str; | |
334 | /* | |
335 | * In case LILO is going to boot us with default command line, | |
336 | * it prepends "auto" before the whole cmdline which makes | |
337 | * the shell think it should execute a script with such name. | |
338 | * So we ignore all arguments entered _before_ init=... [MJ] | |
339 | */ | |
340 | for (i = 1; i < MAX_INIT_ARGS; i++) | |
341 | argv_init[i] = NULL; | |
342 | return 1; | |
343 | } | |
344 | __setup("init=", init_setup); | |
345 | ||
346 | static int __init rdinit_setup(char *str) | |
347 | { | |
348 | unsigned int i; | |
349 | ||
350 | ramdisk_execute_command = str; | |
351 | /* See "auto" comment in init_setup */ | |
352 | for (i = 1; i < MAX_INIT_ARGS; i++) | |
353 | argv_init[i] = NULL; | |
354 | return 1; | |
355 | } | |
356 | __setup("rdinit=", rdinit_setup); | |
357 | ||
358 | #ifndef CONFIG_SMP | |
359 | ||
360 | #ifdef CONFIG_X86_LOCAL_APIC | |
361 | static void __init smp_init(void) | |
362 | { | |
363 | APIC_init_uniprocessor(); | |
364 | } | |
365 | #else | |
366 | #define smp_init() do { } while (0) | |
367 | #endif | |
368 | ||
369 | static inline void setup_nr_cpu_ids(void) { } | |
370 | static inline void smp_prepare_cpus(unsigned int maxcpus) { } | |
371 | ||
372 | #else | |
373 | ||
374 | /* Setup number of possible processor ids */ | |
375 | int nr_cpu_ids __read_mostly = NR_CPUS; | |
376 | EXPORT_SYMBOL(nr_cpu_ids); | |
377 | ||
378 | /* An arch may set nr_cpu_ids earlier if needed, so this would be redundant */ | |
379 | static void __init setup_nr_cpu_ids(void) | |
380 | { | |
381 | nr_cpu_ids = find_last_bit(cpumask_bits(cpu_possible_mask),NR_CPUS) + 1; | |
382 | } | |
383 | ||
384 | /* Called by boot processor to activate the rest. */ | |
385 | static void __init smp_init(void) | |
386 | { | |
387 | unsigned int cpu; | |
388 | ||
389 | /* FIXME: This should be done in userspace --RR */ | |
390 | for_each_present_cpu(cpu) { | |
391 | if (num_online_cpus() >= setup_max_cpus) | |
392 | break; | |
393 | if (!cpu_online(cpu)) | |
394 | cpu_up(cpu); | |
395 | } | |
396 | ||
397 | /* Any cleanup work */ | |
398 | printk(KERN_INFO "Brought up %ld CPUs\n", (long)num_online_cpus()); | |
399 | smp_cpus_done(setup_max_cpus); | |
400 | } | |
401 | ||
402 | #endif | |
403 | ||
404 | /* | |
405 | * We need to store the untouched command line for future reference. | |
406 | * We also need to store the touched command line since the parameter | |
407 | * parsing is performed in place, and we should allow a component to | |
408 | * store reference of name/value for future reference. | |
409 | */ | |
410 | static void __init setup_command_line(char *command_line) | |
411 | { | |
412 | saved_command_line = alloc_bootmem(strlen (boot_command_line)+1); | |
413 | static_command_line = alloc_bootmem(strlen (command_line)+1); | |
414 | strcpy (saved_command_line, boot_command_line); | |
415 | strcpy (static_command_line, command_line); | |
416 | } | |
417 | ||
418 | /* | |
419 | * We need to finalize in a non-__init function or else race conditions | |
420 | * between the root thread and the init thread may cause start_kernel to | |
421 | * be reaped by free_initmem before the root thread has proceeded to | |
422 | * cpu_idle. | |
423 | * | |
424 | * gcc-3.4 accidentally inlines this function, so use noinline. | |
425 | */ | |
426 | ||
427 | static noinline void __init_refok rest_init(void) | |
428 | __releases(kernel_lock) | |
429 | { | |
430 | int pid; | |
431 | ||
432 | rcu_scheduler_starting(); | |
433 | kernel_thread(kernel_init, NULL, CLONE_FS | CLONE_SIGHAND); | |
434 | numa_default_policy(); | |
435 | pid = kernel_thread(kthreadd, NULL, CLONE_FS | CLONE_FILES); | |
436 | rcu_read_lock(); | |
437 | kthreadd_task = find_task_by_pid_ns(pid, &init_pid_ns); | |
438 | rcu_read_unlock(); | |
439 | unlock_kernel(); | |
440 | ||
441 | /* | |
442 | * The boot idle thread must execute schedule() | |
443 | * at least once to get things moving: | |
444 | */ | |
445 | init_idle_bootup_task(current); | |
446 | preempt_enable_no_resched(); | |
447 | schedule(); | |
448 | preempt_disable(); | |
449 | ||
450 | /* Call into cpu_idle with preempt disabled */ | |
451 | cpu_idle(); | |
452 | } | |
453 | ||
454 | /* Check for early params. */ | |
455 | static int __init do_early_param(char *param, char *val) | |
456 | { | |
457 | struct obs_kernel_param *p; | |
458 | ||
459 | for (p = __setup_start; p < __setup_end; p++) { | |
460 | if ((p->early && strcmp(param, p->str) == 0) || | |
461 | (strcmp(param, "console") == 0 && | |
462 | strcmp(p->str, "earlycon") == 0) | |
463 | ) { | |
464 | if (p->setup_func(val) != 0) | |
465 | printk(KERN_WARNING | |
466 | "Malformed early option '%s'\n", param); | |
467 | } | |
468 | } | |
469 | /* We accept everything at this stage. */ | |
470 | return 0; | |
471 | } | |
472 | ||
473 | void __init parse_early_options(char *cmdline) | |
474 | { | |
475 | parse_args("early options", cmdline, NULL, 0, do_early_param); | |
476 | } | |
477 | ||
478 | /* Arch code calls this early on, or if not, just before other parsing. */ | |
479 | void __init parse_early_param(void) | |
480 | { | |
481 | static __initdata int done = 0; | |
482 | static __initdata char tmp_cmdline[COMMAND_LINE_SIZE]; | |
483 | ||
484 | if (done) | |
485 | return; | |
486 | ||
487 | /* All fall through to do_early_param. */ | |
488 | strlcpy(tmp_cmdline, boot_command_line, COMMAND_LINE_SIZE); | |
489 | parse_early_options(tmp_cmdline); | |
490 | done = 1; | |
491 | } | |
492 | ||
493 | /* | |
494 | * Activate the first processor. | |
495 | */ | |
496 | ||
497 | static void __init boot_cpu_init(void) | |
498 | { | |
499 | int cpu = smp_processor_id(); | |
500 | /* Mark the boot cpu "present", "online" etc for SMP and UP case */ | |
501 | set_cpu_online(cpu, true); | |
502 | set_cpu_active(cpu, true); | |
503 | set_cpu_present(cpu, true); | |
504 | set_cpu_possible(cpu, true); | |
505 | } | |
506 | ||
507 | void __init __weak smp_setup_processor_id(void) | |
508 | { | |
509 | } | |
510 | ||
511 | void __init __weak thread_info_cache_init(void) | |
512 | { | |
513 | } | |
514 | ||
515 | /* | |
516 | * Set up kernel memory allocators | |
517 | */ | |
518 | static void __init mm_init(void) | |
519 | { | |
520 | /* | |
521 | * page_cgroup requires countinous pages as memmap | |
522 | * and it's bigger than MAX_ORDER unless SPARSEMEM. | |
523 | */ | |
524 | page_cgroup_init_flatmem(); | |
525 | mem_init(); | |
526 | kmem_cache_init(); | |
527 | pgtable_cache_init(); | |
528 | vmalloc_init(); | |
529 | } | |
530 | ||
531 | asmlinkage void __init start_kernel(void) | |
532 | { | |
533 | char * command_line; | |
534 | extern struct kernel_param __start___param[], __stop___param[]; | |
535 | ||
536 | smp_setup_processor_id(); | |
537 | ||
538 | /* | |
539 | * Need to run as early as possible, to initialize the | |
540 | * lockdep hash: | |
541 | */ | |
542 | lockdep_init(); | |
543 | debug_objects_early_init(); | |
544 | ||
545 | /* | |
546 | * Set up the the initial canary ASAP: | |
547 | */ | |
548 | boot_init_stack_canary(); | |
549 | ||
550 | cgroup_init_early(); | |
551 | ||
552 | local_irq_disable(); | |
553 | early_boot_irqs_off(); | |
554 | early_init_irq_lock_class(); | |
555 | ||
556 | /* | |
557 | * Interrupts are still disabled. Do necessary setups, then | |
558 | * enable them | |
559 | */ | |
560 | lock_kernel(); | |
561 | tick_init(); | |
562 | boot_cpu_init(); | |
563 | page_address_init(); | |
564 | printk(KERN_NOTICE "%s", linux_banner); | |
565 | setup_arch(&command_line); | |
566 | mm_init_owner(&init_mm, &init_task); | |
567 | setup_command_line(command_line); | |
568 | setup_nr_cpu_ids(); | |
569 | setup_per_cpu_areas(); | |
570 | smp_prepare_boot_cpu(); /* arch-specific boot-cpu hooks */ | |
571 | ||
572 | build_all_zonelists(NULL); | |
573 | page_alloc_init(); | |
574 | ||
575 | printk(KERN_NOTICE "Kernel command line: %s\n", boot_command_line); | |
576 | parse_early_param(); | |
577 | parse_args("Booting kernel", static_command_line, __start___param, | |
578 | __stop___param - __start___param, | |
579 | &unknown_bootoption); | |
580 | /* | |
581 | * These use large bootmem allocations and must precede | |
582 | * kmem_cache_init() | |
583 | */ | |
584 | pidhash_init(); | |
585 | vfs_caches_init_early(); | |
586 | sort_main_extable(); | |
587 | trap_init(); | |
588 | mm_init(); | |
589 | /* | |
590 | * Set up the scheduler prior starting any interrupts (such as the | |
591 | * timer interrupt). Full topology setup happens at smp_init() | |
592 | * time - but meanwhile we still have a functioning scheduler. | |
593 | */ | |
594 | sched_init(); | |
595 | /* | |
596 | * Disable preemption - early bootup scheduling is extremely | |
597 | * fragile until we cpu_idle() for the first time. | |
598 | */ | |
599 | preempt_disable(); | |
600 | if (!irqs_disabled()) { | |
601 | printk(KERN_WARNING "start_kernel(): bug: interrupts were " | |
602 | "enabled *very* early, fixing it\n"); | |
603 | local_irq_disable(); | |
604 | } | |
605 | rcu_init(); | |
606 | radix_tree_init(); | |
607 | /* init some links before init_ISA_irqs() */ | |
608 | early_irq_init(); | |
609 | init_IRQ(); | |
610 | prio_tree_init(); | |
611 | init_timers(); | |
612 | hrtimers_init(); | |
613 | softirq_init(); | |
614 | timekeeping_init(); | |
615 | time_init(); | |
616 | profile_init(); | |
617 | if (!irqs_disabled()) | |
618 | printk(KERN_CRIT "start_kernel(): bug: interrupts were " | |
619 | "enabled early\n"); | |
620 | early_boot_irqs_on(); | |
621 | local_irq_enable(); | |
622 | ||
623 | /* Interrupts are enabled now so all GFP allocations are safe. */ | |
624 | gfp_allowed_mask = __GFP_BITS_MASK; | |
625 | ||
626 | kmem_cache_init_late(); | |
627 | ||
628 | /* | |
629 | * HACK ALERT! This is early. We're enabling the console before | |
630 | * we've done PCI setups etc, and console_init() must be aware of | |
631 | * this. But we do want output early, in case something goes wrong. | |
632 | */ | |
633 | console_init(); | |
634 | if (panic_later) | |
635 | panic(panic_later, panic_param); | |
636 | ||
637 | lockdep_info(); | |
638 | ||
639 | /* | |
640 | * Need to run this when irqs are enabled, because it wants | |
641 | * to self-test [hard/soft]-irqs on/off lock inversion bugs | |
642 | * too: | |
643 | */ | |
644 | locking_selftest(); | |
645 | ||
646 | #ifdef CONFIG_BLK_DEV_INITRD | |
647 | if (initrd_start && !initrd_below_start_ok && | |
648 | page_to_pfn(virt_to_page((void *)initrd_start)) < min_low_pfn) { | |
649 | printk(KERN_CRIT "initrd overwritten (0x%08lx < 0x%08lx) - " | |
650 | "disabling it.\n", | |
651 | page_to_pfn(virt_to_page((void *)initrd_start)), | |
652 | min_low_pfn); | |
653 | initrd_start = 0; | |
654 | } | |
655 | #endif | |
656 | page_cgroup_init(); | |
657 | enable_debug_pagealloc(); | |
658 | kmemtrace_init(); | |
659 | kmemleak_init(); | |
660 | debug_objects_mem_init(); | |
661 | idr_init_cache(); | |
662 | setup_per_cpu_pageset(); | |
663 | numa_policy_init(); | |
664 | if (late_time_init) | |
665 | late_time_init(); | |
666 | sched_clock_init(); | |
667 | calibrate_delay(); | |
668 | pidmap_init(); | |
669 | anon_vma_init(); | |
670 | #ifdef CONFIG_X86 | |
671 | if (efi_enabled) | |
672 | efi_enter_virtual_mode(); | |
673 | #endif | |
674 | thread_info_cache_init(); | |
675 | cred_init(); | |
676 | fork_init(totalram_pages); | |
677 | proc_caches_init(); | |
678 | buffer_init(); | |
679 | key_init(); | |
680 | security_init(); | |
681 | dbg_late_init(); | |
682 | vfs_caches_init(totalram_pages); | |
683 | signals_init(); | |
684 | /* rootfs populating might need page-writeback */ | |
685 | page_writeback_init(); | |
686 | #ifdef CONFIG_PROC_FS | |
687 | proc_root_init(); | |
688 | #endif | |
689 | cgroup_init(); | |
690 | cpuset_init(); | |
691 | taskstats_init_early(); | |
692 | delayacct_init(); | |
693 | ||
694 | check_bugs(); | |
695 | ||
696 | acpi_early_init(); /* before LAPIC and SMP init */ | |
697 | sfi_init_late(); | |
698 | ||
699 | ftrace_init(); | |
700 | ||
701 | /* Do the rest non-__init'ed, we're now alive */ | |
702 | rest_init(); | |
703 | } | |
704 | ||
705 | /* Call all constructor functions linked into the kernel. */ | |
706 | static void __init do_ctors(void) | |
707 | { | |
708 | #ifdef CONFIG_CONSTRUCTORS | |
709 | ctor_fn_t *fn = (ctor_fn_t *) __ctors_start; | |
710 | ||
711 | for (; fn < (ctor_fn_t *) __ctors_end; fn++) | |
712 | (*fn)(); | |
713 | #endif | |
714 | } | |
715 | ||
716 | int initcall_debug; | |
717 | core_param(initcall_debug, initcall_debug, bool, 0644); | |
718 | ||
719 | static char msgbuf[64]; | |
720 | static struct boot_trace_call call; | |
721 | static struct boot_trace_ret ret; | |
722 | ||
723 | int do_one_initcall(initcall_t fn) | |
724 | { | |
725 | int count = preempt_count(); | |
726 | ktime_t calltime, delta, rettime; | |
727 | ||
728 | if (initcall_debug) { | |
729 | call.caller = task_pid_nr(current); | |
730 | printk("calling %pF @ %i\n", fn, call.caller); | |
731 | calltime = ktime_get(); | |
732 | trace_boot_call(&call, fn); | |
733 | enable_boot_trace(); | |
734 | } | |
735 | ||
736 | ret.result = fn(); | |
737 | ||
738 | if (initcall_debug) { | |
739 | disable_boot_trace(); | |
740 | rettime = ktime_get(); | |
741 | delta = ktime_sub(rettime, calltime); | |
742 | ret.duration = (unsigned long long) ktime_to_ns(delta) >> 10; | |
743 | trace_boot_ret(&ret, fn); | |
744 | printk("initcall %pF returned %d after %Ld usecs\n", fn, | |
745 | ret.result, ret.duration); | |
746 | } | |
747 | ||
748 | msgbuf[0] = 0; | |
749 | ||
750 | if (ret.result && ret.result != -ENODEV && initcall_debug) | |
751 | sprintf(msgbuf, "error code %d ", ret.result); | |
752 | ||
753 | if (preempt_count() != count) { | |
754 | strlcat(msgbuf, "preemption imbalance ", sizeof(msgbuf)); | |
755 | preempt_count() = count; | |
756 | } | |
757 | if (irqs_disabled()) { | |
758 | strlcat(msgbuf, "disabled interrupts ", sizeof(msgbuf)); | |
759 | local_irq_enable(); | |
760 | } | |
761 | if (msgbuf[0]) { | |
762 | printk("initcall %pF returned with %s\n", fn, msgbuf); | |
763 | } | |
764 | ||
765 | return ret.result; | |
766 | } | |
767 | ||
768 | ||
769 | extern initcall_t __initcall_start[], __initcall_end[], __early_initcall_end[]; | |
770 | ||
771 | static void __init do_initcalls(void) | |
772 | { | |
773 | initcall_t *fn; | |
774 | ||
775 | for (fn = __early_initcall_end; fn < __initcall_end; fn++) | |
776 | do_one_initcall(*fn); | |
777 | ||
778 | /* Make sure there is no pending stuff from the initcall sequence */ | |
779 | flush_scheduled_work(); | |
780 | } | |
781 | ||
782 | /* | |
783 | * Ok, the machine is now initialized. None of the devices | |
784 | * have been touched yet, but the CPU subsystem is up and | |
785 | * running, and memory and process management works. | |
786 | * | |
787 | * Now we can finally start doing some real work.. | |
788 | */ | |
789 | static void __init do_basic_setup(void) | |
790 | { | |
791 | init_workqueues(); | |
792 | cpuset_init_smp(); | |
793 | usermodehelper_init(); | |
794 | init_tmpfs(); | |
795 | driver_init(); | |
796 | init_irq_proc(); | |
797 | do_ctors(); | |
798 | do_initcalls(); | |
799 | } | |
800 | ||
801 | static void __init do_pre_smp_initcalls(void) | |
802 | { | |
803 | initcall_t *fn; | |
804 | ||
805 | for (fn = __initcall_start; fn < __early_initcall_end; fn++) | |
806 | do_one_initcall(*fn); | |
807 | } | |
808 | ||
809 | static void run_init_process(char *init_filename) | |
810 | { | |
811 | argv_init[0] = init_filename; | |
812 | kernel_execve(init_filename, argv_init, envp_init); | |
813 | } | |
814 | ||
815 | /* This is a non __init function. Force it to be noinline otherwise gcc | |
816 | * makes it inline to init() and it becomes part of init.text section | |
817 | */ | |
818 | static noinline int init_post(void) | |
819 | __releases(kernel_lock) | |
820 | { | |
821 | /* need to finish all async __init code before freeing the memory */ | |
822 | async_synchronize_full(); | |
823 | free_initmem(); | |
824 | unlock_kernel(); | |
825 | mark_rodata_ro(); | |
826 | system_state = SYSTEM_RUNNING; | |
827 | numa_default_policy(); | |
828 | ||
829 | ||
830 | current->signal->flags |= SIGNAL_UNKILLABLE; | |
831 | ||
832 | if (ramdisk_execute_command) { | |
833 | run_init_process(ramdisk_execute_command); | |
834 | printk(KERN_WARNING "Failed to execute %s\n", | |
835 | ramdisk_execute_command); | |
836 | } | |
837 | ||
838 | /* | |
839 | * We try each of these until one succeeds. | |
840 | * | |
841 | * The Bourne shell can be used instead of init if we are | |
842 | * trying to recover a really broken machine. | |
843 | */ | |
844 | if (execute_command) { | |
845 | run_init_process(execute_command); | |
846 | printk(KERN_WARNING "Failed to execute %s. Attempting " | |
847 | "defaults...\n", execute_command); | |
848 | } | |
849 | run_init_process("/sbin/init"); | |
850 | run_init_process("/etc/init"); | |
851 | run_init_process("/bin/init"); | |
852 | run_init_process("/bin/sh"); | |
853 | ||
854 | panic("No init found. Try passing init= option to kernel. " | |
855 | "See Linux Documentation/init.txt for guidance."); | |
856 | } | |
857 | ||
858 | static int __init kernel_init(void * unused) | |
859 | { | |
860 | lock_kernel(); | |
861 | ||
862 | /* | |
863 | * init can allocate pages on any node | |
864 | */ | |
865 | set_mems_allowed(node_states[N_HIGH_MEMORY]); | |
866 | /* | |
867 | * init can run on any cpu. | |
868 | */ | |
869 | set_cpus_allowed_ptr(current, cpu_all_mask); | |
870 | /* | |
871 | * Tell the world that we're going to be the grim | |
872 | * reaper of innocent orphaned children. | |
873 | * | |
874 | * We don't want people to have to make incorrect | |
875 | * assumptions about where in the task array this | |
876 | * can be found. | |
877 | */ | |
878 | init_pid_ns.child_reaper = current; | |
879 | ||
880 | cad_pid = task_pid(current); | |
881 | ||
882 | smp_prepare_cpus(setup_max_cpus); | |
883 | ||
884 | do_pre_smp_initcalls(); | |
885 | start_boot_trace(); | |
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 | init_post(); | |
918 | return 0; | |
919 | } |