]>
Commit | Line | Data |
---|---|---|
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 | ||
79 | #include <asm/io.h> | |
80 | #include <asm/bugs.h> | |
81 | #include <asm/setup.h> | |
82 | #include <asm/sections.h> | |
83 | #include <asm/cacheflush.h> | |
84 | ||
85 | #ifdef CONFIG_X86_LOCAL_APIC | |
86 | #include <asm/smp.h> | |
87 | #endif | |
88 | ||
89 | static int kernel_init(void *); | |
90 | ||
91 | extern void init_IRQ(void); | |
92 | extern void fork_init(unsigned long); | |
93 | extern void mca_init(void); | |
94 | extern void sbus_init(void); | |
95 | extern void radix_tree_init(void); | |
96 | #ifndef CONFIG_DEBUG_RODATA | |
97 | static inline void mark_rodata_ro(void) { } | |
98 | #endif | |
99 | ||
100 | #ifdef CONFIG_TC | |
101 | extern void tc_init(void); | |
102 | #endif | |
103 | ||
104 | /* | |
105 | * Debug helper: via this flag we know that we are in 'early bootup code' | |
106 | * where only the boot processor is running with IRQ disabled. This means | |
107 | * two things - IRQ must not be enabled before the flag is cleared and some | |
108 | * operations which are not allowed with IRQ disabled are allowed while the | |
109 | * flag is set. | |
110 | */ | |
111 | bool early_boot_irqs_disabled __read_mostly; | |
112 | ||
113 | enum system_states system_state __read_mostly; | |
114 | EXPORT_SYMBOL(system_state); | |
115 | ||
116 | /* | |
117 | * Boot command-line arguments | |
118 | */ | |
119 | #define MAX_INIT_ARGS CONFIG_INIT_ENV_ARG_LIMIT | |
120 | #define MAX_INIT_ENVS CONFIG_INIT_ENV_ARG_LIMIT | |
121 | ||
122 | extern void time_init(void); | |
123 | /* Default late time init is NULL. archs can override this later. */ | |
124 | void (*__initdata late_time_init)(void); | |
125 | extern void softirq_init(void); | |
126 | ||
127 | /* Untouched command line saved by arch-specific code. */ | |
128 | char __initdata boot_command_line[COMMAND_LINE_SIZE]; | |
129 | /* Untouched saved command line (eg. for /proc) */ | |
130 | char *saved_command_line; | |
131 | /* Command line for parameter parsing */ | |
132 | static char *static_command_line; | |
133 | ||
134 | static char *execute_command; | |
135 | static char *ramdisk_execute_command; | |
136 | ||
137 | /* | |
138 | * If set, this is an indication to the drivers that reset the underlying | |
139 | * device before going ahead with the initialization otherwise driver might | |
140 | * rely on the BIOS and skip the reset operation. | |
141 | * | |
142 | * This is useful if kernel is booting in an unreliable environment. | |
143 | * For ex. kdump situaiton where previous kernel has crashed, BIOS has been | |
144 | * skipped and devices will be in unknown state. | |
145 | */ | |
146 | unsigned int reset_devices; | |
147 | EXPORT_SYMBOL(reset_devices); | |
148 | ||
149 | static int __init set_reset_devices(char *str) | |
150 | { | |
151 | reset_devices = 1; | |
152 | return 1; | |
153 | } | |
154 | ||
155 | __setup("reset_devices", set_reset_devices); | |
156 | ||
157 | static const char * argv_init[MAX_INIT_ARGS+2] = { "init", NULL, }; | |
158 | const char * envp_init[MAX_INIT_ENVS+2] = { "HOME=/", "TERM=linux", NULL, }; | |
159 | static const char *panic_later, *panic_param; | |
160 | ||
161 | extern const struct obs_kernel_param __setup_start[], __setup_end[]; | |
162 | ||
163 | static int __init obsolete_checksetup(char *line) | |
164 | { | |
165 | const struct obs_kernel_param *p; | |
166 | int had_early_param = 0; | |
167 | ||
168 | p = __setup_start; | |
169 | do { | |
170 | int n = strlen(p->str); | |
171 | if (parameqn(line, p->str, n)) { | |
172 | if (p->early) { | |
173 | /* Already done in parse_early_param? | |
174 | * (Needs exact match on param part). | |
175 | * Keep iterating, as we can have early | |
176 | * params and __setups of same names 8( */ | |
177 | if (line[n] == '\0' || line[n] == '=') | |
178 | had_early_param = 1; | |
179 | } else if (!p->setup_func) { | |
180 | pr_warn("Parameter %s is obsolete, ignored\n", | |
181 | p->str); | |
182 | return 1; | |
183 | } else if (p->setup_func(line + n)) | |
184 | return 1; | |
185 | } | |
186 | p++; | |
187 | } while (p < __setup_end); | |
188 | ||
189 | return had_early_param; | |
190 | } | |
191 | ||
192 | /* | |
193 | * This should be approx 2 Bo*oMips to start (note initial shift), and will | |
194 | * still work even if initially too large, it will just take slightly longer | |
195 | */ | |
196 | unsigned long loops_per_jiffy = (1<<12); | |
197 | ||
198 | EXPORT_SYMBOL(loops_per_jiffy); | |
199 | ||
200 | static int __init debug_kernel(char *str) | |
201 | { | |
202 | console_loglevel = 10; | |
203 | return 0; | |
204 | } | |
205 | ||
206 | static int __init quiet_kernel(char *str) | |
207 | { | |
208 | console_loglevel = 4; | |
209 | return 0; | |
210 | } | |
211 | ||
212 | early_param("debug", debug_kernel); | |
213 | early_param("quiet", quiet_kernel); | |
214 | ||
215 | static int __init loglevel(char *str) | |
216 | { | |
217 | int newlevel; | |
218 | ||
219 | /* | |
220 | * Only update loglevel value when a correct setting was passed, | |
221 | * to prevent blind crashes (when loglevel being set to 0) that | |
222 | * are quite hard to debug | |
223 | */ | |
224 | if (get_option(&str, &newlevel)) { | |
225 | console_loglevel = newlevel; | |
226 | return 0; | |
227 | } | |
228 | ||
229 | return -EINVAL; | |
230 | } | |
231 | ||
232 | early_param("loglevel", loglevel); | |
233 | ||
234 | /* Change NUL term back to "=", to make "param" the whole string. */ | |
235 | static int __init repair_env_string(char *param, char *val, const char *unused) | |
236 | { | |
237 | if (val) { | |
238 | /* param=val or param="val"? */ | |
239 | if (val == param+strlen(param)+1) | |
240 | val[-1] = '='; | |
241 | else if (val == param+strlen(param)+2) { | |
242 | val[-2] = '='; | |
243 | memmove(val-1, val, strlen(val)+1); | |
244 | val--; | |
245 | } else | |
246 | BUG(); | |
247 | } | |
248 | return 0; | |
249 | } | |
250 | ||
251 | /* | |
252 | * Unknown boot options get handed to init, unless they look like | |
253 | * unused parameters (modprobe will find them in /proc/cmdline). | |
254 | */ | |
255 | static int __init unknown_bootoption(char *param, char *val, const char *unused) | |
256 | { | |
257 | repair_env_string(param, val, unused); | |
258 | ||
259 | /* Handle obsolete-style parameters */ | |
260 | if (obsolete_checksetup(param)) | |
261 | return 0; | |
262 | ||
263 | /* Unused module parameter. */ | |
264 | if (strchr(param, '.') && (!val || strchr(param, '.') < val)) | |
265 | return 0; | |
266 | ||
267 | if (panic_later) | |
268 | return 0; | |
269 | ||
270 | if (val) { | |
271 | /* Environment option */ | |
272 | unsigned int i; | |
273 | for (i = 0; envp_init[i]; i++) { | |
274 | if (i == MAX_INIT_ENVS) { | |
275 | panic_later = "Too many boot env vars at `%s'"; | |
276 | panic_param = param; | |
277 | } | |
278 | if (!strncmp(param, envp_init[i], val - param)) | |
279 | break; | |
280 | } | |
281 | envp_init[i] = param; | |
282 | } else { | |
283 | /* Command line option */ | |
284 | unsigned int i; | |
285 | for (i = 0; argv_init[i]; i++) { | |
286 | if (i == MAX_INIT_ARGS) { | |
287 | panic_later = "Too many boot init vars at `%s'"; | |
288 | panic_param = param; | |
289 | } | |
290 | } | |
291 | argv_init[i] = param; | |
292 | } | |
293 | return 0; | |
294 | } | |
295 | ||
296 | static int __init init_setup(char *str) | |
297 | { | |
298 | unsigned int i; | |
299 | ||
300 | execute_command = str; | |
301 | /* | |
302 | * In case LILO is going to boot us with default command line, | |
303 | * it prepends "auto" before the whole cmdline which makes | |
304 | * the shell think it should execute a script with such name. | |
305 | * So we ignore all arguments entered _before_ init=... [MJ] | |
306 | */ | |
307 | for (i = 1; i < MAX_INIT_ARGS; i++) | |
308 | argv_init[i] = NULL; | |
309 | return 1; | |
310 | } | |
311 | __setup("init=", init_setup); | |
312 | ||
313 | static int __init rdinit_setup(char *str) | |
314 | { | |
315 | unsigned int i; | |
316 | ||
317 | ramdisk_execute_command = str; | |
318 | /* See "auto" comment in init_setup */ | |
319 | for (i = 1; i < MAX_INIT_ARGS; i++) | |
320 | argv_init[i] = NULL; | |
321 | return 1; | |
322 | } | |
323 | __setup("rdinit=", rdinit_setup); | |
324 | ||
325 | #ifndef CONFIG_SMP | |
326 | static const unsigned int setup_max_cpus = NR_CPUS; | |
327 | #ifdef CONFIG_X86_LOCAL_APIC | |
328 | static void __init smp_init(void) | |
329 | { | |
330 | APIC_init_uniprocessor(); | |
331 | } | |
332 | #else | |
333 | #define smp_init() do { } while (0) | |
334 | #endif | |
335 | ||
336 | static inline void setup_nr_cpu_ids(void) { } | |
337 | static inline void smp_prepare_cpus(unsigned int maxcpus) { } | |
338 | #endif | |
339 | ||
340 | /* | |
341 | * We need to store the untouched command line for future reference. | |
342 | * We also need to store the touched command line since the parameter | |
343 | * parsing is performed in place, and we should allow a component to | |
344 | * store reference of name/value for future reference. | |
345 | */ | |
346 | static void __init setup_command_line(char *command_line) | |
347 | { | |
348 | saved_command_line = alloc_bootmem(strlen (boot_command_line)+1); | |
349 | static_command_line = alloc_bootmem(strlen (command_line)+1); | |
350 | strcpy (saved_command_line, boot_command_line); | |
351 | strcpy (static_command_line, command_line); | |
352 | } | |
353 | ||
354 | /* | |
355 | * We need to finalize in a non-__init function or else race conditions | |
356 | * between the root thread and the init thread may cause start_kernel to | |
357 | * be reaped by free_initmem before the root thread has proceeded to | |
358 | * cpu_idle. | |
359 | * | |
360 | * gcc-3.4 accidentally inlines this function, so use noinline. | |
361 | */ | |
362 | ||
363 | static __initdata DECLARE_COMPLETION(kthreadd_done); | |
364 | ||
365 | static noinline void __init_refok rest_init(void) | |
366 | { | |
367 | int pid; | |
368 | ||
369 | rcu_scheduler_starting(); | |
370 | /* | |
371 | * We need to spawn init first so that it obtains pid 1, however | |
372 | * the init task will end up wanting to create kthreads, which, if | |
373 | * we schedule it before we create kthreadd, will OOPS. | |
374 | */ | |
375 | kernel_thread(kernel_init, NULL, CLONE_FS | CLONE_SIGHAND); | |
376 | numa_default_policy(); | |
377 | pid = kernel_thread(kthreadd, NULL, CLONE_FS | CLONE_FILES); | |
378 | rcu_read_lock(); | |
379 | kthreadd_task = find_task_by_pid_ns(pid, &init_pid_ns); | |
380 | rcu_read_unlock(); | |
381 | complete(&kthreadd_done); | |
382 | ||
383 | /* | |
384 | * The boot idle thread must execute schedule() | |
385 | * at least once to get things moving: | |
386 | */ | |
387 | init_idle_bootup_task(current); | |
388 | schedule_preempt_disabled(); | |
389 | /* Call into cpu_idle with preempt disabled */ | |
390 | cpu_startup_entry(CPUHP_ONLINE); | |
391 | } | |
392 | ||
393 | /* Check for early params. */ | |
394 | static int __init do_early_param(char *param, char *val, const char *unused) | |
395 | { | |
396 | const struct obs_kernel_param *p; | |
397 | ||
398 | for (p = __setup_start; p < __setup_end; p++) { | |
399 | if ((p->early && parameq(param, p->str)) || | |
400 | (strcmp(param, "console") == 0 && | |
401 | strcmp(p->str, "earlycon") == 0) | |
402 | ) { | |
403 | if (p->setup_func(val) != 0) | |
404 | pr_warn("Malformed early option '%s'\n", param); | |
405 | } | |
406 | } | |
407 | /* We accept everything at this stage. */ | |
408 | return 0; | |
409 | } | |
410 | ||
411 | void __init parse_early_options(char *cmdline) | |
412 | { | |
413 | parse_args("early options", cmdline, NULL, 0, 0, 0, do_early_param); | |
414 | } | |
415 | ||
416 | /* Arch code calls this early on, or if not, just before other parsing. */ | |
417 | void __init parse_early_param(void) | |
418 | { | |
419 | static __initdata int done = 0; | |
420 | static __initdata char tmp_cmdline[COMMAND_LINE_SIZE]; | |
421 | ||
422 | if (done) | |
423 | return; | |
424 | ||
425 | /* All fall through to do_early_param. */ | |
426 | strlcpy(tmp_cmdline, boot_command_line, COMMAND_LINE_SIZE); | |
427 | parse_early_options(tmp_cmdline); | |
428 | done = 1; | |
429 | } | |
430 | ||
431 | /* | |
432 | * Activate the first processor. | |
433 | */ | |
434 | ||
435 | static void __init boot_cpu_init(void) | |
436 | { | |
437 | int cpu = smp_processor_id(); | |
438 | /* Mark the boot cpu "present", "online" etc for SMP and UP case */ | |
439 | set_cpu_online(cpu, true); | |
440 | set_cpu_active(cpu, true); | |
441 | set_cpu_present(cpu, true); | |
442 | set_cpu_possible(cpu, true); | |
443 | } | |
444 | ||
445 | void __init __weak smp_setup_processor_id(void) | |
446 | { | |
447 | } | |
448 | ||
449 | # if THREAD_SIZE >= PAGE_SIZE | |
450 | void __init __weak thread_info_cache_init(void) | |
451 | { | |
452 | } | |
453 | #endif | |
454 | ||
455 | /* | |
456 | * Set up kernel memory allocators | |
457 | */ | |
458 | static void __init mm_init(void) | |
459 | { | |
460 | /* | |
461 | * page_cgroup requires contiguous pages, | |
462 | * bigger than MAX_ORDER unless SPARSEMEM. | |
463 | */ | |
464 | page_cgroup_init_flatmem(); | |
465 | mem_init(); | |
466 | kmem_cache_init(); | |
467 | percpu_init_late(); | |
468 | pgtable_cache_init(); | |
469 | vmalloc_init(); | |
470 | } | |
471 | ||
472 | asmlinkage void __init start_kernel(void) | |
473 | { | |
474 | char * command_line; | |
475 | extern const struct kernel_param __start___param[], __stop___param[]; | |
476 | ||
477 | /* | |
478 | * Need to run as early as possible, to initialize the | |
479 | * lockdep hash: | |
480 | */ | |
481 | lockdep_init(); | |
482 | smp_setup_processor_id(); | |
483 | debug_objects_early_init(); | |
484 | ||
485 | /* | |
486 | * Set up the the initial canary ASAP: | |
487 | */ | |
488 | boot_init_stack_canary(); | |
489 | ||
490 | cgroup_init_early(); | |
491 | ||
492 | local_irq_disable(); | |
493 | early_boot_irqs_disabled = true; | |
494 | ||
495 | /* | |
496 | * Interrupts are still disabled. Do necessary setups, then | |
497 | * enable them | |
498 | */ | |
499 | boot_cpu_init(); | |
500 | page_address_init(); | |
501 | pr_notice("%s", linux_banner); | |
502 | setup_arch(&command_line); | |
503 | mm_init_owner(&init_mm, &init_task); | |
504 | mm_init_cpumask(&init_mm); | |
505 | setup_command_line(command_line); | |
506 | setup_nr_cpu_ids(); | |
507 | setup_per_cpu_areas(); | |
508 | smp_prepare_boot_cpu(); /* arch-specific boot-cpu hooks */ | |
509 | ||
510 | build_all_zonelists(NULL, NULL); | |
511 | page_alloc_init(); | |
512 | ||
513 | pr_notice("Kernel command line: %s\n", boot_command_line); | |
514 | parse_early_param(); | |
515 | parse_args("Booting kernel", static_command_line, __start___param, | |
516 | __stop___param - __start___param, | |
517 | -1, -1, &unknown_bootoption); | |
518 | ||
519 | jump_label_init(); | |
520 | ||
521 | /* | |
522 | * These use large bootmem allocations and must precede | |
523 | * kmem_cache_init() | |
524 | */ | |
525 | setup_log_buf(0); | |
526 | pidhash_init(); | |
527 | vfs_caches_init_early(); | |
528 | sort_main_extable(); | |
529 | trap_init(); | |
530 | mm_init(); | |
531 | ||
532 | /* | |
533 | * Set up the scheduler prior starting any interrupts (such as the | |
534 | * timer interrupt). Full topology setup happens at smp_init() | |
535 | * time - but meanwhile we still have a functioning scheduler. | |
536 | */ | |
537 | sched_init(); | |
538 | /* | |
539 | * Disable preemption - early bootup scheduling is extremely | |
540 | * fragile until we cpu_idle() for the first time. | |
541 | */ | |
542 | preempt_disable(); | |
543 | if (WARN(!irqs_disabled(), "Interrupts were enabled *very* early, fixing it\n")) | |
544 | local_irq_disable(); | |
545 | idr_init_cache(); | |
546 | rcu_init(); | |
547 | tick_nohz_init(); | |
548 | radix_tree_init(); | |
549 | /* init some links before init_ISA_irqs() */ | |
550 | early_irq_init(); | |
551 | init_IRQ(); | |
552 | tick_init(); | |
553 | init_timers(); | |
554 | hrtimers_init(); | |
555 | softirq_init(); | |
556 | timekeeping_init(); | |
557 | time_init(); | |
558 | sched_clock_postinit(); | |
559 | perf_event_init(); | |
560 | profile_init(); | |
561 | call_function_init(); | |
562 | WARN(!irqs_disabled(), "Interrupts were enabled early\n"); | |
563 | early_boot_irqs_disabled = false; | |
564 | local_irq_enable(); | |
565 | ||
566 | kmem_cache_init_late(); | |
567 | ||
568 | /* | |
569 | * HACK ALERT! This is early. We're enabling the console before | |
570 | * we've done PCI setups etc, and console_init() must be aware of | |
571 | * this. But we do want output early, in case something goes wrong. | |
572 | */ | |
573 | console_init(); | |
574 | if (panic_later) | |
575 | panic(panic_later, panic_param); | |
576 | ||
577 | lockdep_info(); | |
578 | ||
579 | /* | |
580 | * Need to run this when irqs are enabled, because it wants | |
581 | * to self-test [hard/soft]-irqs on/off lock inversion bugs | |
582 | * too: | |
583 | */ | |
584 | locking_selftest(); | |
585 | ||
586 | #ifdef CONFIG_BLK_DEV_INITRD | |
587 | if (initrd_start && !initrd_below_start_ok && | |
588 | page_to_pfn(virt_to_page((void *)initrd_start)) < min_low_pfn) { | |
589 | pr_crit("initrd overwritten (0x%08lx < 0x%08lx) - disabling it.\n", | |
590 | page_to_pfn(virt_to_page((void *)initrd_start)), | |
591 | min_low_pfn); | |
592 | initrd_start = 0; | |
593 | } | |
594 | #endif | |
595 | page_cgroup_init(); | |
596 | debug_objects_mem_init(); | |
597 | kmemleak_init(); | |
598 | setup_per_cpu_pageset(); | |
599 | numa_policy_init(); | |
600 | if (late_time_init) | |
601 | late_time_init(); | |
602 | sched_clock_init(); | |
603 | calibrate_delay(); | |
604 | pidmap_init(); | |
605 | anon_vma_init(); | |
606 | #ifdef CONFIG_X86 | |
607 | if (efi_enabled(EFI_RUNTIME_SERVICES)) | |
608 | efi_enter_virtual_mode(); | |
609 | #endif | |
610 | thread_info_cache_init(); | |
611 | cred_init(); | |
612 | fork_init(totalram_pages); | |
613 | proc_caches_init(); | |
614 | buffer_init(); | |
615 | key_init(); | |
616 | security_init(); | |
617 | dbg_late_init(); | |
618 | vfs_caches_init(totalram_pages); | |
619 | signals_init(); | |
620 | /* rootfs populating might need page-writeback */ | |
621 | page_writeback_init(); | |
622 | #ifdef CONFIG_PROC_FS | |
623 | proc_root_init(); | |
624 | #endif | |
625 | cgroup_init(); | |
626 | cpuset_init(); | |
627 | taskstats_init_early(); | |
628 | delayacct_init(); | |
629 | ||
630 | check_bugs(); | |
631 | ||
632 | acpi_early_init(); /* before LAPIC and SMP init */ | |
633 | sfi_init_late(); | |
634 | ||
635 | if (efi_enabled(EFI_RUNTIME_SERVICES)) { | |
636 | efi_late_init(); | |
637 | efi_free_boot_services(); | |
638 | } | |
639 | ||
640 | ftrace_init(); | |
641 | ||
642 | /* Do the rest non-__init'ed, we're now alive */ | |
643 | rest_init(); | |
644 | } | |
645 | ||
646 | /* Call all constructor functions linked into the kernel. */ | |
647 | static void __init do_ctors(void) | |
648 | { | |
649 | #ifdef CONFIG_CONSTRUCTORS | |
650 | ctor_fn_t *fn = (ctor_fn_t *) __ctors_start; | |
651 | ||
652 | for (; fn < (ctor_fn_t *) __ctors_end; fn++) | |
653 | (*fn)(); | |
654 | #endif | |
655 | } | |
656 | ||
657 | bool initcall_debug; | |
658 | core_param(initcall_debug, initcall_debug, bool, 0644); | |
659 | ||
660 | static int __init_or_module do_one_initcall_debug(initcall_t fn) | |
661 | { | |
662 | ktime_t calltime, delta, rettime; | |
663 | unsigned long long duration; | |
664 | int ret; | |
665 | ||
666 | pr_debug("calling %pF @ %i\n", fn, task_pid_nr(current)); | |
667 | calltime = ktime_get(); | |
668 | ret = fn(); | |
669 | rettime = ktime_get(); | |
670 | delta = ktime_sub(rettime, calltime); | |
671 | duration = (unsigned long long) ktime_to_ns(delta) >> 10; | |
672 | pr_debug("initcall %pF returned %d after %lld usecs\n", | |
673 | fn, ret, duration); | |
674 | ||
675 | return ret; | |
676 | } | |
677 | ||
678 | int __init_or_module do_one_initcall(initcall_t fn) | |
679 | { | |
680 | int count = preempt_count(); | |
681 | int ret; | |
682 | char msgbuf[64]; | |
683 | ||
684 | if (initcall_debug) | |
685 | ret = do_one_initcall_debug(fn); | |
686 | else | |
687 | ret = fn(); | |
688 | ||
689 | msgbuf[0] = 0; | |
690 | ||
691 | if (preempt_count() != count) { | |
692 | sprintf(msgbuf, "preemption imbalance "); | |
693 | preempt_count() = count; | |
694 | } | |
695 | if (irqs_disabled()) { | |
696 | strlcat(msgbuf, "disabled interrupts ", sizeof(msgbuf)); | |
697 | local_irq_enable(); | |
698 | } | |
699 | WARN(msgbuf[0], "initcall %pF returned with %s\n", fn, msgbuf); | |
700 | ||
701 | return ret; | |
702 | } | |
703 | ||
704 | ||
705 | extern initcall_t __initcall_start[]; | |
706 | extern initcall_t __initcall0_start[]; | |
707 | extern initcall_t __initcall1_start[]; | |
708 | extern initcall_t __initcall2_start[]; | |
709 | extern initcall_t __initcall3_start[]; | |
710 | extern initcall_t __initcall4_start[]; | |
711 | extern initcall_t __initcall5_start[]; | |
712 | extern initcall_t __initcall6_start[]; | |
713 | extern initcall_t __initcall7_start[]; | |
714 | extern initcall_t __initcall_end[]; | |
715 | ||
716 | static initcall_t *initcall_levels[] __initdata = { | |
717 | __initcall0_start, | |
718 | __initcall1_start, | |
719 | __initcall2_start, | |
720 | __initcall3_start, | |
721 | __initcall4_start, | |
722 | __initcall5_start, | |
723 | __initcall6_start, | |
724 | __initcall7_start, | |
725 | __initcall_end, | |
726 | }; | |
727 | ||
728 | /* Keep these in sync with initcalls in include/linux/init.h */ | |
729 | static char *initcall_level_names[] __initdata = { | |
730 | "early", | |
731 | "core", | |
732 | "postcore", | |
733 | "arch", | |
734 | "subsys", | |
735 | "fs", | |
736 | "device", | |
737 | "late", | |
738 | }; | |
739 | ||
740 | static void __init do_initcall_level(int level) | |
741 | { | |
742 | extern const struct kernel_param __start___param[], __stop___param[]; | |
743 | initcall_t *fn; | |
744 | ||
745 | strcpy(static_command_line, saved_command_line); | |
746 | parse_args(initcall_level_names[level], | |
747 | static_command_line, __start___param, | |
748 | __stop___param - __start___param, | |
749 | level, level, | |
750 | &repair_env_string); | |
751 | ||
752 | for (fn = initcall_levels[level]; fn < initcall_levels[level+1]; fn++) | |
753 | do_one_initcall(*fn); | |
754 | } | |
755 | ||
756 | static void __init do_initcalls(void) | |
757 | { | |
758 | int level; | |
759 | ||
760 | for (level = 0; level < ARRAY_SIZE(initcall_levels) - 1; level++) | |
761 | do_initcall_level(level); | |
762 | } | |
763 | ||
764 | /* | |
765 | * Ok, the machine is now initialized. None of the devices | |
766 | * have been touched yet, but the CPU subsystem is up and | |
767 | * running, and memory and process management works. | |
768 | * | |
769 | * Now we can finally start doing some real work.. | |
770 | */ | |
771 | static void __init do_basic_setup(void) | |
772 | { | |
773 | cpuset_init_smp(); | |
774 | usermodehelper_init(); | |
775 | shmem_init(); | |
776 | driver_init(); | |
777 | init_irq_proc(); | |
778 | do_ctors(); | |
779 | usermodehelper_enable(); | |
780 | do_initcalls(); | |
781 | } | |
782 | ||
783 | static void __init do_pre_smp_initcalls(void) | |
784 | { | |
785 | initcall_t *fn; | |
786 | ||
787 | for (fn = __initcall_start; fn < __initcall0_start; fn++) | |
788 | do_one_initcall(*fn); | |
789 | } | |
790 | ||
791 | /* | |
792 | * This function requests modules which should be loaded by default and is | |
793 | * called twice right after initrd is mounted and right before init is | |
794 | * exec'd. If such modules are on either initrd or rootfs, they will be | |
795 | * loaded before control is passed to userland. | |
796 | */ | |
797 | void __init load_default_modules(void) | |
798 | { | |
799 | load_default_elevator_module(); | |
800 | } | |
801 | ||
802 | static int run_init_process(const char *init_filename) | |
803 | { | |
804 | argv_init[0] = init_filename; | |
805 | return do_execve(init_filename, | |
806 | (const char __user *const __user *)argv_init, | |
807 | (const char __user *const __user *)envp_init); | |
808 | } | |
809 | ||
810 | static noinline void __init kernel_init_freeable(void); | |
811 | ||
812 | static int __ref kernel_init(void *unused) | |
813 | { | |
814 | kernel_init_freeable(); | |
815 | /* need to finish all async __init code before freeing the memory */ | |
816 | async_synchronize_full(); | |
817 | free_initmem(); | |
818 | mark_rodata_ro(); | |
819 | system_state = SYSTEM_RUNNING; | |
820 | numa_default_policy(); | |
821 | ||
822 | flush_delayed_fput(); | |
823 | ||
824 | if (ramdisk_execute_command) { | |
825 | if (!run_init_process(ramdisk_execute_command)) | |
826 | return 0; | |
827 | pr_err("Failed to execute %s\n", ramdisk_execute_command); | |
828 | } | |
829 | ||
830 | /* | |
831 | * We try each of these until one succeeds. | |
832 | * | |
833 | * The Bourne shell can be used instead of init if we are | |
834 | * trying to recover a really broken machine. | |
835 | */ | |
836 | if (execute_command) { | |
837 | if (!run_init_process(execute_command)) | |
838 | return 0; | |
839 | pr_err("Failed to execute %s. Attempting defaults...\n", | |
840 | execute_command); | |
841 | } | |
842 | if (!run_init_process("/sbin/init") || | |
843 | !run_init_process("/etc/init") || | |
844 | !run_init_process("/bin/init") || | |
845 | !run_init_process("/bin/sh")) | |
846 | return 0; | |
847 | ||
848 | panic("No init found. Try passing init= option to kernel. " | |
849 | "See Linux Documentation/init.txt for guidance."); | |
850 | } | |
851 | ||
852 | static noinline void __init kernel_init_freeable(void) | |
853 | { | |
854 | /* | |
855 | * Wait until kthreadd is all set-up. | |
856 | */ | |
857 | wait_for_completion(&kthreadd_done); | |
858 | ||
859 | /* Now the scheduler is fully set up and can do blocking allocations */ | |
860 | gfp_allowed_mask = __GFP_BITS_MASK; | |
861 | ||
862 | /* | |
863 | * init can allocate pages on any node | |
864 | */ | |
865 | set_mems_allowed(node_states[N_MEMORY]); | |
866 | /* | |
867 | * init can run on any cpu. | |
868 | */ | |
869 | set_cpus_allowed_ptr(current, cpu_all_mask); | |
870 | ||
871 | cad_pid = task_pid(current); | |
872 | ||
873 | smp_prepare_cpus(setup_max_cpus); | |
874 | ||
875 | do_pre_smp_initcalls(); | |
876 | lockup_detector_init(); | |
877 | ||
878 | smp_init(); | |
879 | sched_init_smp(); | |
880 | ||
881 | do_basic_setup(); | |
882 | ||
883 | /* Open the /dev/console on the rootfs, this should never fail */ | |
884 | if (sys_open((const char __user *) "/dev/console", O_RDWR, 0) < 0) | |
885 | pr_err("Warning: unable to open an initial console.\n"); | |
886 | ||
887 | (void) sys_dup(0); | |
888 | (void) sys_dup(0); | |
889 | /* | |
890 | * check if there is an early userspace init. If yes, let it do all | |
891 | * the work | |
892 | */ | |
893 | ||
894 | if (!ramdisk_execute_command) | |
895 | ramdisk_execute_command = "/init"; | |
896 | ||
897 | if (sys_access((const char __user *) ramdisk_execute_command, 0) != 0) { | |
898 | ramdisk_execute_command = NULL; | |
899 | prepare_namespace(); | |
900 | } | |
901 | ||
902 | /* | |
903 | * Ok, we have completed the initial bootup, and | |
904 | * we're essentially up and running. Get rid of the | |
905 | * initmem segments and start the user-mode stuff.. | |
906 | */ | |
907 | ||
908 | /* rootfs is available now, try loading default modules */ | |
909 | load_default_modules(); | |
910 | } |