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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/utsname.h> | |
22 | #include <linux/ioport.h> | |
23 | #include <linux/init.h> | |
24 | #include <linux/smp_lock.h> | |
25 | #include <linux/initrd.h> | |
26 | #include <linux/bootmem.h> | |
27 | #include <linux/tty.h> | |
28 | #include <linux/gfp.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/workqueue.h> | |
37 | #include <linux/profile.h> | |
38 | #include <linux/rcupdate.h> | |
39 | #include <linux/moduleparam.h> | |
40 | #include <linux/kallsyms.h> | |
41 | #include <linux/writeback.h> | |
42 | #include <linux/cpu.h> | |
43 | #include <linux/cpuset.h> | |
44 | #include <linux/cgroup.h> | |
45 | #include <linux/efi.h> | |
46 | #include <linux/tick.h> | |
47 | #include <linux/interrupt.h> | |
48 | #include <linux/taskstats_kern.h> | |
49 | #include <linux/delayacct.h> | |
50 | #include <linux/unistd.h> | |
51 | #include <linux/rmap.h> | |
52 | #include <linux/mempolicy.h> | |
53 | #include <linux/key.h> | |
54 | #include <linux/buffer_head.h> | |
55 | #include <linux/page_cgroup.h> | |
56 | #include <linux/debug_locks.h> | |
57 | #include <linux/debugobjects.h> | |
58 | #include <linux/lockdep.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/ftrace.h> | |
66 | #include <linux/async.h> | |
67 | #include <trace/boot.h> | |
68 | ||
69 | #include <asm/io.h> | |
70 | #include <asm/bugs.h> | |
71 | #include <asm/setup.h> | |
72 | #include <asm/sections.h> | |
73 | #include <asm/cacheflush.h> | |
74 | ||
75 | #ifdef CONFIG_X86_LOCAL_APIC | |
76 | #include <asm/smp.h> | |
77 | #endif | |
78 | ||
79 | static int kernel_init(void *); | |
80 | ||
81 | extern void init_IRQ(void); | |
82 | extern void fork_init(unsigned long); | |
83 | extern void mca_init(void); | |
84 | extern void sbus_init(void); | |
85 | extern void prio_tree_init(void); | |
86 | extern void radix_tree_init(void); | |
87 | extern void free_initmem(void); | |
88 | #ifdef CONFIG_ACPI | |
89 | extern void acpi_early_init(void); | |
90 | #else | |
91 | static inline void acpi_early_init(void) { } | |
92 | #endif | |
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 | enum system_states system_state __read_mostly; | |
102 | EXPORT_SYMBOL(system_state); | |
103 | ||
104 | /* | |
105 | * Boot command-line arguments | |
106 | */ | |
107 | #define MAX_INIT_ARGS CONFIG_INIT_ENV_ARG_LIMIT | |
108 | #define MAX_INIT_ENVS CONFIG_INIT_ENV_ARG_LIMIT | |
109 | ||
110 | extern void time_init(void); | |
111 | /* Default late time init is NULL. archs can override this later. */ | |
112 | void (*__initdata late_time_init)(void); | |
113 | extern void softirq_init(void); | |
114 | ||
115 | /* Untouched command line saved by arch-specific code. */ | |
116 | char __initdata boot_command_line[COMMAND_LINE_SIZE]; | |
117 | /* Untouched saved command line (eg. for /proc) */ | |
118 | char *saved_command_line; | |
119 | /* Command line for parameter parsing */ | |
120 | static char *static_command_line; | |
121 | ||
122 | static char *execute_command; | |
123 | static char *ramdisk_execute_command; | |
124 | ||
125 | #ifdef CONFIG_SMP | |
126 | /* Setup configured maximum number of CPUs to activate */ | |
127 | unsigned int __initdata setup_max_cpus = NR_CPUS; | |
128 | ||
129 | /* | |
130 | * Setup routine for controlling SMP activation | |
131 | * | |
132 | * Command-line option of "nosmp" or "maxcpus=0" will disable SMP | |
133 | * activation entirely (the MPS table probe still happens, though). | |
134 | * | |
135 | * Command-line option of "maxcpus=<NUM>", where <NUM> is an integer | |
136 | * greater than 0, limits the maximum number of CPUs activated in | |
137 | * SMP mode to <NUM>. | |
138 | */ | |
139 | ||
140 | void __weak arch_disable_smp_support(void) { } | |
141 | ||
142 | static int __init nosmp(char *str) | |
143 | { | |
144 | setup_max_cpus = 0; | |
145 | arch_disable_smp_support(); | |
146 | ||
147 | return 0; | |
148 | } | |
149 | ||
150 | early_param("nosmp", nosmp); | |
151 | ||
152 | static int __init maxcpus(char *str) | |
153 | { | |
154 | get_option(&str, &setup_max_cpus); | |
155 | if (setup_max_cpus == 0) | |
156 | arch_disable_smp_support(); | |
157 | ||
158 | return 0; | |
159 | } | |
160 | ||
161 | early_param("maxcpus", maxcpus); | |
162 | #else | |
163 | const unsigned int setup_max_cpus = NR_CPUS; | |
164 | #endif | |
165 | ||
166 | /* | |
167 | * If set, this is an indication to the drivers that reset the underlying | |
168 | * device before going ahead with the initialization otherwise driver might | |
169 | * rely on the BIOS and skip the reset operation. | |
170 | * | |
171 | * This is useful if kernel is booting in an unreliable environment. | |
172 | * For ex. kdump situaiton where previous kernel has crashed, BIOS has been | |
173 | * skipped and devices will be in unknown state. | |
174 | */ | |
175 | unsigned int reset_devices; | |
176 | EXPORT_SYMBOL(reset_devices); | |
177 | ||
178 | static int __init set_reset_devices(char *str) | |
179 | { | |
180 | reset_devices = 1; | |
181 | return 1; | |
182 | } | |
183 | ||
184 | __setup("reset_devices", set_reset_devices); | |
185 | ||
186 | static char * argv_init[MAX_INIT_ARGS+2] = { "init", NULL, }; | |
187 | char * envp_init[MAX_INIT_ENVS+2] = { "HOME=/", "TERM=linux", NULL, }; | |
188 | static const char *panic_later, *panic_param; | |
189 | ||
190 | extern struct obs_kernel_param __setup_start[], __setup_end[]; | |
191 | ||
192 | static int __init obsolete_checksetup(char *line) | |
193 | { | |
194 | struct obs_kernel_param *p; | |
195 | int had_early_param = 0; | |
196 | ||
197 | p = __setup_start; | |
198 | do { | |
199 | int n = strlen(p->str); | |
200 | if (!strncmp(line, p->str, n)) { | |
201 | if (p->early) { | |
202 | /* Already done in parse_early_param? | |
203 | * (Needs exact match on param part). | |
204 | * Keep iterating, as we can have early | |
205 | * params and __setups of same names 8( */ | |
206 | if (line[n] == '\0' || line[n] == '=') | |
207 | had_early_param = 1; | |
208 | } else if (!p->setup_func) { | |
209 | printk(KERN_WARNING "Parameter %s is obsolete," | |
210 | " ignored\n", p->str); | |
211 | return 1; | |
212 | } else if (p->setup_func(line + n)) | |
213 | return 1; | |
214 | } | |
215 | p++; | |
216 | } while (p < __setup_end); | |
217 | ||
218 | return had_early_param; | |
219 | } | |
220 | ||
221 | /* | |
222 | * This should be approx 2 Bo*oMips to start (note initial shift), and will | |
223 | * still work even if initially too large, it will just take slightly longer | |
224 | */ | |
225 | unsigned long loops_per_jiffy = (1<<12); | |
226 | ||
227 | EXPORT_SYMBOL(loops_per_jiffy); | |
228 | ||
229 | static int __init debug_kernel(char *str) | |
230 | { | |
231 | console_loglevel = 10; | |
232 | return 0; | |
233 | } | |
234 | ||
235 | static int __init quiet_kernel(char *str) | |
236 | { | |
237 | console_loglevel = 4; | |
238 | return 0; | |
239 | } | |
240 | ||
241 | early_param("debug", debug_kernel); | |
242 | early_param("quiet", quiet_kernel); | |
243 | ||
244 | static int __init loglevel(char *str) | |
245 | { | |
246 | get_option(&str, &console_loglevel); | |
247 | return 0; | |
248 | } | |
249 | ||
250 | early_param("loglevel", loglevel); | |
251 | ||
252 | /* | |
253 | * Unknown boot options get handed to init, unless they look like | |
254 | * failed parameters | |
255 | */ | |
256 | static int __init unknown_bootoption(char *param, char *val) | |
257 | { | |
258 | /* Change NUL term back to "=", to make "param" the whole string. */ | |
259 | if (val) { | |
260 | /* param=val or param="val"? */ | |
261 | if (val == param+strlen(param)+1) | |
262 | val[-1] = '='; | |
263 | else if (val == param+strlen(param)+2) { | |
264 | val[-2] = '='; | |
265 | memmove(val-1, val, strlen(val)+1); | |
266 | val--; | |
267 | } else | |
268 | BUG(); | |
269 | } | |
270 | ||
271 | /* Handle obsolete-style parameters */ | |
272 | if (obsolete_checksetup(param)) | |
273 | return 0; | |
274 | ||
275 | /* | |
276 | * Preemptive maintenance for "why didn't my misspelled command | |
277 | * line work?" | |
278 | */ | |
279 | if (strchr(param, '.') && (!val || strchr(param, '.') < val)) { | |
280 | printk(KERN_ERR "Unknown boot option `%s': ignoring\n", param); | |
281 | return 0; | |
282 | } | |
283 | ||
284 | if (panic_later) | |
285 | return 0; | |
286 | ||
287 | if (val) { | |
288 | /* Environment option */ | |
289 | unsigned int i; | |
290 | for (i = 0; envp_init[i]; i++) { | |
291 | if (i == MAX_INIT_ENVS) { | |
292 | panic_later = "Too many boot env vars at `%s'"; | |
293 | panic_param = param; | |
294 | } | |
295 | if (!strncmp(param, envp_init[i], val - param)) | |
296 | break; | |
297 | } | |
298 | envp_init[i] = param; | |
299 | } else { | |
300 | /* Command line option */ | |
301 | unsigned int i; | |
302 | for (i = 0; argv_init[i]; i++) { | |
303 | if (i == MAX_INIT_ARGS) { | |
304 | panic_later = "Too many boot init vars at `%s'"; | |
305 | panic_param = param; | |
306 | } | |
307 | } | |
308 | argv_init[i] = param; | |
309 | } | |
310 | return 0; | |
311 | } | |
312 | ||
313 | #ifdef CONFIG_DEBUG_PAGEALLOC | |
314 | int __read_mostly debug_pagealloc_enabled = 0; | |
315 | #endif | |
316 | ||
317 | static int __init init_setup(char *str) | |
318 | { | |
319 | unsigned int i; | |
320 | ||
321 | execute_command = str; | |
322 | /* | |
323 | * In case LILO is going to boot us with default command line, | |
324 | * it prepends "auto" before the whole cmdline which makes | |
325 | * the shell think it should execute a script with such name. | |
326 | * So we ignore all arguments entered _before_ init=... [MJ] | |
327 | */ | |
328 | for (i = 1; i < MAX_INIT_ARGS; i++) | |
329 | argv_init[i] = NULL; | |
330 | return 1; | |
331 | } | |
332 | __setup("init=", init_setup); | |
333 | ||
334 | static int __init rdinit_setup(char *str) | |
335 | { | |
336 | unsigned int i; | |
337 | ||
338 | ramdisk_execute_command = str; | |
339 | /* See "auto" comment in init_setup */ | |
340 | for (i = 1; i < MAX_INIT_ARGS; i++) | |
341 | argv_init[i] = NULL; | |
342 | return 1; | |
343 | } | |
344 | __setup("rdinit=", rdinit_setup); | |
345 | ||
346 | #ifndef CONFIG_SMP | |
347 | ||
348 | #ifdef CONFIG_X86_LOCAL_APIC | |
349 | static void __init smp_init(void) | |
350 | { | |
351 | APIC_init_uniprocessor(); | |
352 | } | |
353 | #else | |
354 | #define smp_init() do { } while (0) | |
355 | #endif | |
356 | ||
357 | static inline void setup_per_cpu_areas(void) { } | |
358 | static inline void setup_nr_cpu_ids(void) { } | |
359 | static inline void smp_prepare_cpus(unsigned int maxcpus) { } | |
360 | ||
361 | #else | |
362 | ||
363 | #if NR_CPUS > BITS_PER_LONG | |
364 | cpumask_t cpu_mask_all __read_mostly = CPU_MASK_ALL; | |
365 | EXPORT_SYMBOL(cpu_mask_all); | |
366 | #endif | |
367 | ||
368 | /* Setup number of possible processor ids */ | |
369 | int nr_cpu_ids __read_mostly = NR_CPUS; | |
370 | EXPORT_SYMBOL(nr_cpu_ids); | |
371 | ||
372 | /* An arch may set nr_cpu_ids earlier if needed, so this would be redundant */ | |
373 | static void __init setup_nr_cpu_ids(void) | |
374 | { | |
375 | nr_cpu_ids = find_last_bit(cpumask_bits(cpu_possible_mask),NR_CPUS) + 1; | |
376 | } | |
377 | ||
378 | #ifndef CONFIG_HAVE_SETUP_PER_CPU_AREA | |
379 | unsigned long __per_cpu_offset[NR_CPUS] __read_mostly; | |
380 | ||
381 | EXPORT_SYMBOL(__per_cpu_offset); | |
382 | ||
383 | static void __init setup_per_cpu_areas(void) | |
384 | { | |
385 | unsigned long size, i; | |
386 | char *ptr; | |
387 | unsigned long nr_possible_cpus = num_possible_cpus(); | |
388 | ||
389 | /* Copy section for each CPU (we discard the original) */ | |
390 | size = ALIGN(PERCPU_ENOUGH_ROOM, PAGE_SIZE); | |
391 | ptr = alloc_bootmem_pages(size * nr_possible_cpus); | |
392 | ||
393 | for_each_possible_cpu(i) { | |
394 | __per_cpu_offset[i] = ptr - __per_cpu_start; | |
395 | memcpy(ptr, __per_cpu_start, __per_cpu_end - __per_cpu_start); | |
396 | ptr += size; | |
397 | } | |
398 | } | |
399 | #endif /* CONFIG_HAVE_SETUP_PER_CPU_AREA */ | |
400 | ||
401 | /* Called by boot processor to activate the rest. */ | |
402 | static void __init smp_init(void) | |
403 | { | |
404 | unsigned int cpu; | |
405 | ||
406 | /* | |
407 | * Set up the current CPU as possible to migrate to. | |
408 | * The other ones will be done by cpu_up/cpu_down() | |
409 | */ | |
410 | cpu = smp_processor_id(); | |
411 | cpu_set(cpu, cpu_active_map); | |
412 | ||
413 | /* FIXME: This should be done in userspace --RR */ | |
414 | for_each_present_cpu(cpu) { | |
415 | if (num_online_cpus() >= setup_max_cpus) | |
416 | break; | |
417 | if (!cpu_online(cpu)) | |
418 | cpu_up(cpu); | |
419 | } | |
420 | ||
421 | /* Any cleanup work */ | |
422 | printk(KERN_INFO "Brought up %ld CPUs\n", (long)num_online_cpus()); | |
423 | smp_cpus_done(setup_max_cpus); | |
424 | } | |
425 | ||
426 | #endif | |
427 | ||
428 | /* | |
429 | * We need to store the untouched command line for future reference. | |
430 | * We also need to store the touched command line since the parameter | |
431 | * parsing is performed in place, and we should allow a component to | |
432 | * store reference of name/value for future reference. | |
433 | */ | |
434 | static void __init setup_command_line(char *command_line) | |
435 | { | |
436 | saved_command_line = alloc_bootmem(strlen (boot_command_line)+1); | |
437 | static_command_line = alloc_bootmem(strlen (command_line)+1); | |
438 | strcpy (saved_command_line, boot_command_line); | |
439 | strcpy (static_command_line, command_line); | |
440 | } | |
441 | ||
442 | /* | |
443 | * We need to finalize in a non-__init function or else race conditions | |
444 | * between the root thread and the init thread may cause start_kernel to | |
445 | * be reaped by free_initmem before the root thread has proceeded to | |
446 | * cpu_idle. | |
447 | * | |
448 | * gcc-3.4 accidentally inlines this function, so use noinline. | |
449 | */ | |
450 | ||
451 | static noinline void __init_refok rest_init(void) | |
452 | __releases(kernel_lock) | |
453 | { | |
454 | int pid; | |
455 | ||
456 | kernel_thread(kernel_init, NULL, CLONE_FS | CLONE_SIGHAND); | |
457 | numa_default_policy(); | |
458 | pid = kernel_thread(kthreadd, NULL, CLONE_FS | CLONE_FILES); | |
459 | kthreadd_task = find_task_by_pid_ns(pid, &init_pid_ns); | |
460 | unlock_kernel(); | |
461 | ||
462 | /* | |
463 | * The boot idle thread must execute schedule() | |
464 | * at least once to get things moving: | |
465 | */ | |
466 | init_idle_bootup_task(current); | |
467 | rcu_scheduler_starting(); | |
468 | preempt_enable_no_resched(); | |
469 | schedule(); | |
470 | preempt_disable(); | |
471 | ||
472 | /* Call into cpu_idle with preempt disabled */ | |
473 | cpu_idle(); | |
474 | } | |
475 | ||
476 | /* Check for early params. */ | |
477 | static int __init do_early_param(char *param, char *val) | |
478 | { | |
479 | struct obs_kernel_param *p; | |
480 | ||
481 | for (p = __setup_start; p < __setup_end; p++) { | |
482 | if ((p->early && strcmp(param, p->str) == 0) || | |
483 | (strcmp(param, "console") == 0 && | |
484 | strcmp(p->str, "earlycon") == 0) | |
485 | ) { | |
486 | if (p->setup_func(val) != 0) | |
487 | printk(KERN_WARNING | |
488 | "Malformed early option '%s'\n", param); | |
489 | } | |
490 | } | |
491 | /* We accept everything at this stage. */ | |
492 | return 0; | |
493 | } | |
494 | ||
495 | /* Arch code calls this early on, or if not, just before other parsing. */ | |
496 | void __init parse_early_param(void) | |
497 | { | |
498 | static __initdata int done = 0; | |
499 | static __initdata char tmp_cmdline[COMMAND_LINE_SIZE]; | |
500 | ||
501 | if (done) | |
502 | return; | |
503 | ||
504 | /* All fall through to do_early_param. */ | |
505 | strlcpy(tmp_cmdline, boot_command_line, COMMAND_LINE_SIZE); | |
506 | parse_args("early options", tmp_cmdline, NULL, 0, do_early_param); | |
507 | done = 1; | |
508 | } | |
509 | ||
510 | /* | |
511 | * Activate the first processor. | |
512 | */ | |
513 | ||
514 | static void __init boot_cpu_init(void) | |
515 | { | |
516 | int cpu = smp_processor_id(); | |
517 | /* Mark the boot cpu "present", "online" etc for SMP and UP case */ | |
518 | set_cpu_online(cpu, true); | |
519 | set_cpu_present(cpu, true); | |
520 | set_cpu_possible(cpu, true); | |
521 | } | |
522 | ||
523 | void __init __weak smp_setup_processor_id(void) | |
524 | { | |
525 | } | |
526 | ||
527 | void __init __weak thread_info_cache_init(void) | |
528 | { | |
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); | |
565 | printk(linux_banner); | |
566 | setup_arch(&command_line); | |
567 | mm_init_owner(&init_mm, &init_task); | |
568 | setup_command_line(command_line); | |
569 | setup_per_cpu_areas(); | |
570 | setup_nr_cpu_ids(); | |
571 | smp_prepare_boot_cpu(); /* arch-specific boot-cpu hooks */ | |
572 | ||
573 | /* | |
574 | * Set up the scheduler prior starting any interrupts (such as the | |
575 | * timer interrupt). Full topology setup happens at smp_init() | |
576 | * time - but meanwhile we still have a functioning scheduler. | |
577 | */ | |
578 | sched_init(); | |
579 | /* | |
580 | * Disable preemption - early bootup scheduling is extremely | |
581 | * fragile until we cpu_idle() for the first time. | |
582 | */ | |
583 | preempt_disable(); | |
584 | build_all_zonelists(); | |
585 | page_alloc_init(); | |
586 | printk(KERN_NOTICE "Kernel command line: %s\n", boot_command_line); | |
587 | parse_early_param(); | |
588 | parse_args("Booting kernel", static_command_line, __start___param, | |
589 | __stop___param - __start___param, | |
590 | &unknown_bootoption); | |
591 | if (!irqs_disabled()) { | |
592 | printk(KERN_WARNING "start_kernel(): bug: interrupts were " | |
593 | "enabled *very* early, fixing it\n"); | |
594 | local_irq_disable(); | |
595 | } | |
596 | sort_main_extable(); | |
597 | trap_init(); | |
598 | rcu_init(); | |
599 | /* init some links before init_ISA_irqs() */ | |
600 | early_irq_init(); | |
601 | init_IRQ(); | |
602 | pidhash_init(); | |
603 | init_timers(); | |
604 | hrtimers_init(); | |
605 | softirq_init(); | |
606 | timekeeping_init(); | |
607 | time_init(); | |
608 | sched_clock_init(); | |
609 | profile_init(); | |
610 | if (!irqs_disabled()) | |
611 | printk(KERN_CRIT "start_kernel(): bug: interrupts were " | |
612 | "enabled early\n"); | |
613 | early_boot_irqs_on(); | |
614 | local_irq_enable(); | |
615 | ||
616 | /* | |
617 | * HACK ALERT! This is early. We're enabling the console before | |
618 | * we've done PCI setups etc, and console_init() must be aware of | |
619 | * this. But we do want output early, in case something goes wrong. | |
620 | */ | |
621 | console_init(); | |
622 | if (panic_later) | |
623 | panic(panic_later, panic_param); | |
624 | ||
625 | lockdep_info(); | |
626 | ||
627 | /* | |
628 | * Need to run this when irqs are enabled, because it wants | |
629 | * to self-test [hard/soft]-irqs on/off lock inversion bugs | |
630 | * too: | |
631 | */ | |
632 | locking_selftest(); | |
633 | ||
634 | #ifdef CONFIG_BLK_DEV_INITRD | |
635 | if (initrd_start && !initrd_below_start_ok && | |
636 | page_to_pfn(virt_to_page((void *)initrd_start)) < min_low_pfn) { | |
637 | printk(KERN_CRIT "initrd overwritten (0x%08lx < 0x%08lx) - " | |
638 | "disabling it.\n", | |
639 | page_to_pfn(virt_to_page((void *)initrd_start)), | |
640 | min_low_pfn); | |
641 | initrd_start = 0; | |
642 | } | |
643 | #endif | |
644 | vmalloc_init(); | |
645 | vfs_caches_init_early(); | |
646 | cpuset_init_early(); | |
647 | page_cgroup_init(); | |
648 | mem_init(); | |
649 | enable_debug_pagealloc(); | |
650 | cpu_hotplug_init(); | |
651 | kmem_cache_init(); | |
652 | debug_objects_mem_init(); | |
653 | idr_init_cache(); | |
654 | setup_per_cpu_pageset(); | |
655 | numa_policy_init(); | |
656 | if (late_time_init) | |
657 | late_time_init(); | |
658 | calibrate_delay(); | |
659 | pidmap_init(); | |
660 | pgtable_cache_init(); | |
661 | prio_tree_init(); | |
662 | anon_vma_init(); | |
663 | #ifdef CONFIG_X86 | |
664 | if (efi_enabled) | |
665 | efi_enter_virtual_mode(); | |
666 | #endif | |
667 | thread_info_cache_init(); | |
668 | cred_init(); | |
669 | fork_init(num_physpages); | |
670 | proc_caches_init(); | |
671 | buffer_init(); | |
672 | key_init(); | |
673 | security_init(); | |
674 | vfs_caches_init(num_physpages); | |
675 | radix_tree_init(); | |
676 | signals_init(); | |
677 | /* rootfs populating might need page-writeback */ | |
678 | page_writeback_init(); | |
679 | #ifdef CONFIG_PROC_FS | |
680 | proc_root_init(); | |
681 | #endif | |
682 | cgroup_init(); | |
683 | cpuset_init(); | |
684 | taskstats_init_early(); | |
685 | delayacct_init(); | |
686 | ||
687 | check_bugs(); | |
688 | ||
689 | acpi_early_init(); /* before LAPIC and SMP init */ | |
690 | ||
691 | ftrace_init(); | |
692 | ||
693 | /* Do the rest non-__init'ed, we're now alive */ | |
694 | rest_init(); | |
695 | } | |
696 | ||
697 | int initcall_debug; | |
698 | core_param(initcall_debug, initcall_debug, bool, 0644); | |
699 | ||
700 | int do_one_initcall(initcall_t fn) | |
701 | { | |
702 | int count = preempt_count(); | |
703 | ktime_t calltime, delta, rettime; | |
704 | char msgbuf[64]; | |
705 | struct boot_trace_call call; | |
706 | struct boot_trace_ret ret; | |
707 | ||
708 | if (initcall_debug) { | |
709 | call.caller = task_pid_nr(current); | |
710 | printk("calling %pF @ %i\n", fn, call.caller); | |
711 | calltime = ktime_get(); | |
712 | trace_boot_call(&call, fn); | |
713 | enable_boot_trace(); | |
714 | } | |
715 | ||
716 | ret.result = fn(); | |
717 | ||
718 | if (initcall_debug) { | |
719 | disable_boot_trace(); | |
720 | rettime = ktime_get(); | |
721 | delta = ktime_sub(rettime, calltime); | |
722 | ret.duration = (unsigned long long) ktime_to_ns(delta) >> 10; | |
723 | trace_boot_ret(&ret, fn); | |
724 | printk("initcall %pF returned %d after %Ld usecs\n", fn, | |
725 | ret.result, ret.duration); | |
726 | } | |
727 | ||
728 | msgbuf[0] = 0; | |
729 | ||
730 | if (ret.result && ret.result != -ENODEV && initcall_debug) | |
731 | sprintf(msgbuf, "error code %d ", ret.result); | |
732 | ||
733 | if (preempt_count() != count) { | |
734 | strlcat(msgbuf, "preemption imbalance ", sizeof(msgbuf)); | |
735 | preempt_count() = count; | |
736 | } | |
737 | if (irqs_disabled()) { | |
738 | strlcat(msgbuf, "disabled interrupts ", sizeof(msgbuf)); | |
739 | local_irq_enable(); | |
740 | } | |
741 | if (msgbuf[0]) { | |
742 | printk("initcall %pF returned with %s\n", fn, msgbuf); | |
743 | } | |
744 | ||
745 | return ret.result; | |
746 | } | |
747 | ||
748 | ||
749 | extern initcall_t __initcall_start[], __initcall_end[], __early_initcall_end[]; | |
750 | ||
751 | static void __init do_initcalls(void) | |
752 | { | |
753 | initcall_t *call; | |
754 | ||
755 | for (call = __early_initcall_end; call < __initcall_end; call++) | |
756 | do_one_initcall(*call); | |
757 | ||
758 | /* Make sure there is no pending stuff from the initcall sequence */ | |
759 | flush_scheduled_work(); | |
760 | } | |
761 | ||
762 | /* | |
763 | * Ok, the machine is now initialized. None of the devices | |
764 | * have been touched yet, but the CPU subsystem is up and | |
765 | * running, and memory and process management works. | |
766 | * | |
767 | * Now we can finally start doing some real work.. | |
768 | */ | |
769 | static void __init do_basic_setup(void) | |
770 | { | |
771 | rcu_init_sched(); /* needed by module_init stage. */ | |
772 | init_workqueues(); | |
773 | usermodehelper_init(); | |
774 | driver_init(); | |
775 | init_irq_proc(); | |
776 | do_initcalls(); | |
777 | } | |
778 | ||
779 | static void __init do_pre_smp_initcalls(void) | |
780 | { | |
781 | initcall_t *call; | |
782 | ||
783 | for (call = __initcall_start; call < __early_initcall_end; call++) | |
784 | do_one_initcall(*call); | |
785 | } | |
786 | ||
787 | static void run_init_process(char *init_filename) | |
788 | { | |
789 | argv_init[0] = init_filename; | |
790 | kernel_execve(init_filename, argv_init, envp_init); | |
791 | } | |
792 | ||
793 | /* This is a non __init function. Force it to be noinline otherwise gcc | |
794 | * makes it inline to init() and it becomes part of init.text section | |
795 | */ | |
796 | static noinline int init_post(void) | |
797 | { | |
798 | /* need to finish all async __init code before freeing the memory */ | |
799 | async_synchronize_full(); | |
800 | free_initmem(); | |
801 | unlock_kernel(); | |
802 | mark_rodata_ro(); | |
803 | system_state = SYSTEM_RUNNING; | |
804 | numa_default_policy(); | |
805 | ||
806 | if (sys_open((const char __user *) "/dev/console", O_RDWR, 0) < 0) | |
807 | printk(KERN_WARNING "Warning: unable to open an initial console.\n"); | |
808 | ||
809 | (void) sys_dup(0); | |
810 | (void) sys_dup(0); | |
811 | ||
812 | current->signal->flags |= SIGNAL_UNKILLABLE; | |
813 | ||
814 | if (ramdisk_execute_command) { | |
815 | run_init_process(ramdisk_execute_command); | |
816 | printk(KERN_WARNING "Failed to execute %s\n", | |
817 | ramdisk_execute_command); | |
818 | } | |
819 | ||
820 | /* | |
821 | * We try each of these until one succeeds. | |
822 | * | |
823 | * The Bourne shell can be used instead of init if we are | |
824 | * trying to recover a really broken machine. | |
825 | */ | |
826 | if (execute_command) { | |
827 | run_init_process(execute_command); | |
828 | printk(KERN_WARNING "Failed to execute %s. Attempting " | |
829 | "defaults...\n", execute_command); | |
830 | } | |
831 | run_init_process("/sbin/init"); | |
832 | run_init_process("/etc/init"); | |
833 | run_init_process("/bin/init"); | |
834 | run_init_process("/bin/sh"); | |
835 | ||
836 | panic("No init found. Try passing init= option to kernel."); | |
837 | } | |
838 | ||
839 | static int __init kernel_init(void * unused) | |
840 | { | |
841 | lock_kernel(); | |
842 | /* | |
843 | * init can run on any cpu. | |
844 | */ | |
845 | set_cpus_allowed_ptr(current, CPU_MASK_ALL_PTR); | |
846 | /* | |
847 | * Tell the world that we're going to be the grim | |
848 | * reaper of innocent orphaned children. | |
849 | * | |
850 | * We don't want people to have to make incorrect | |
851 | * assumptions about where in the task array this | |
852 | * can be found. | |
853 | */ | |
854 | init_pid_ns.child_reaper = current; | |
855 | ||
856 | cad_pid = task_pid(current); | |
857 | ||
858 | smp_prepare_cpus(setup_max_cpus); | |
859 | ||
860 | do_pre_smp_initcalls(); | |
861 | start_boot_trace(); | |
862 | ||
863 | smp_init(); | |
864 | sched_init_smp(); | |
865 | ||
866 | cpuset_init_smp(); | |
867 | ||
868 | do_basic_setup(); | |
869 | ||
870 | /* | |
871 | * check if there is an early userspace init. If yes, let it do all | |
872 | * the work | |
873 | */ | |
874 | ||
875 | if (!ramdisk_execute_command) | |
876 | ramdisk_execute_command = "/init"; | |
877 | ||
878 | if (sys_access((const char __user *) ramdisk_execute_command, 0) != 0) { | |
879 | ramdisk_execute_command = NULL; | |
880 | prepare_namespace(); | |
881 | } | |
882 | ||
883 | /* | |
884 | * Ok, we have completed the initial bootup, and | |
885 | * we're essentially up and running. Get rid of the | |
886 | * initmem segments and start the user-mode stuff.. | |
887 | */ | |
888 | ||
889 | init_post(); | |
890 | return 0; | |
891 | } |