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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/ftrace.h> |
66 | #include <linux/async.h> |
67 | #include <linux/kmemcheck.h> |
68 | #include <linux/kmemtrace.h> |
69 | #include <linux/sfi.h> |
70 | #include <linux/shmem_fs.h> |
71 | #include <linux/slab.h> |
72 | #include <trace/boot.h> |
73 | |
74 | #include <asm/io.h> |
75 | #include <asm/bugs.h> |
76 | #include <asm/setup.h> |
77 | #include <asm/sections.h> |
78 | #include <asm/cacheflush.h> |
79 | |
80 | #ifdef CONFIG_X86_LOCAL_APIC |
81 | #include <asm/smp.h> |
82 | #endif |
83 | |
84 | static int kernel_init(void *); |
85 | |
86 | extern void init_IRQ(void); |
87 | extern void fork_init(unsigned long); |
88 | extern void mca_init(void); |
89 | extern void sbus_init(void); |
90 | extern void prio_tree_init(void); |
91 | extern void radix_tree_init(void); |
92 | extern void free_initmem(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 | 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 | /* this is hard limit */ |
153 | static int __init nrcpus(char *str) |
154 | { |
155 | int nr_cpus; |
156 | |
157 | get_option(&str, &nr_cpus); |
158 | if (nr_cpus > 0 && nr_cpus < nr_cpu_ids) |
159 | nr_cpu_ids = nr_cpus; |
160 | |
161 | return 0; |
162 | } |
163 | |
164 | early_param("nr_cpus", nrcpus); |
165 | |
166 | static int __init maxcpus(char *str) |
167 | { |
168 | get_option(&str, &setup_max_cpus); |
169 | if (setup_max_cpus == 0) |
170 | arch_disable_smp_support(); |
171 | |
172 | return 0; |
173 | } |
174 | |
175 | early_param("maxcpus", maxcpus); |
176 | #else |
177 | static const unsigned int setup_max_cpus = NR_CPUS; |
178 | #endif |
179 | |
180 | /* |
181 | * If set, this is an indication to the drivers that reset the underlying |
182 | * device before going ahead with the initialization otherwise driver might |
183 | * rely on the BIOS and skip the reset operation. |
184 | * |
185 | * This is useful if kernel is booting in an unreliable environment. |
186 | * For ex. kdump situaiton where previous kernel has crashed, BIOS has been |
187 | * skipped and devices will be in unknown state. |
188 | */ |
189 | unsigned int reset_devices; |
190 | EXPORT_SYMBOL(reset_devices); |
191 | |
192 | static int __init set_reset_devices(char *str) |
193 | { |
194 | reset_devices = 1; |
195 | return 1; |
196 | } |
197 | |
198 | __setup("reset_devices", set_reset_devices); |
199 | |
200 | static char * argv_init[MAX_INIT_ARGS+2] = { "init", NULL, }; |
201 | char * envp_init[MAX_INIT_ENVS+2] = { "HOME=/", "TERM=linux", NULL, }; |
202 | static const char *panic_later, *panic_param; |
203 | |
204 | extern struct obs_kernel_param __setup_start[], __setup_end[]; |
205 | |
206 | static int __init obsolete_checksetup(char *line) |
207 | { |
208 | struct obs_kernel_param *p; |
209 | int had_early_param = 0; |
210 | |
211 | p = __setup_start; |
212 | do { |
213 | int n = strlen(p->str); |
214 | if (!strncmp(line, p->str, n)) { |
215 | if (p->early) { |
216 | /* Already done in parse_early_param? |
217 | * (Needs exact match on param part). |
218 | * Keep iterating, as we can have early |
219 | * params and __setups of same names 8( */ |
220 | if (line[n] == '\0' || line[n] == '=') |
221 | had_early_param = 1; |
222 | } else if (!p->setup_func) { |
223 | printk(KERN_WARNING "Parameter %s is obsolete," |
224 | " ignored\n", p->str); |
225 | return 1; |
226 | } else if (p->setup_func(line + n)) |
227 | return 1; |
228 | } |
229 | p++; |
230 | } while (p < __setup_end); |
231 | |
232 | return had_early_param; |
233 | } |
234 | |
235 | /* |
236 | * This should be approx 2 Bo*oMips to start (note initial shift), and will |
237 | * still work even if initially too large, it will just take slightly longer |
238 | */ |
239 | unsigned long loops_per_jiffy = (1<<12); |
240 | |
241 | EXPORT_SYMBOL(loops_per_jiffy); |
242 | |
243 | static int __init debug_kernel(char *str) |
244 | { |
245 | console_loglevel = 10; |
246 | return 0; |
247 | } |
248 | |
249 | static int __init quiet_kernel(char *str) |
250 | { |
251 | console_loglevel = 4; |
252 | return 0; |
253 | } |
254 | |
255 | early_param("debug", debug_kernel); |
256 | early_param("quiet", quiet_kernel); |
257 | |
258 | static int __init loglevel(char *str) |
259 | { |
260 | get_option(&str, &console_loglevel); |
261 | return 0; |
262 | } |
263 | |
264 | early_param("loglevel", loglevel); |
265 | |
266 | /* |
267 | * Unknown boot options get handed to init, unless they look like |
268 | * unused parameters (modprobe will find them in /proc/cmdline). |
269 | */ |
270 | static int __init unknown_bootoption(char *param, char *val) |
271 | { |
272 | /* Change NUL term back to "=", to make "param" the whole string. */ |
273 | if (val) { |
274 | /* param=val or param="val"? */ |
275 | if (val == param+strlen(param)+1) |
276 | val[-1] = '='; |
277 | else if (val == param+strlen(param)+2) { |
278 | val[-2] = '='; |
279 | memmove(val-1, val, strlen(val)+1); |
280 | val--; |
281 | } else |
282 | BUG(); |
283 | } |
284 | |
285 | /* Handle obsolete-style parameters */ |
286 | if (obsolete_checksetup(param)) |
287 | return 0; |
288 | |
289 | /* Unused module parameter. */ |
290 | if (strchr(param, '.') && (!val || strchr(param, '.') < val)) |
291 | return 0; |
292 | |
293 | if (panic_later) |
294 | return 0; |
295 | |
296 | if (val) { |
297 | /* Environment option */ |
298 | unsigned int i; |
299 | for (i = 0; envp_init[i]; i++) { |
300 | if (i == MAX_INIT_ENVS) { |
301 | panic_later = "Too many boot env vars at `%s'"; |
302 | panic_param = param; |
303 | } |
304 | if (!strncmp(param, envp_init[i], val - param)) |
305 | break; |
306 | } |
307 | envp_init[i] = param; |
308 | } else { |
309 | /* Command line option */ |
310 | unsigned int i; |
311 | for (i = 0; argv_init[i]; i++) { |
312 | if (i == MAX_INIT_ARGS) { |
313 | panic_later = "Too many boot init vars at `%s'"; |
314 | panic_param = param; |
315 | } |
316 | } |
317 | argv_init[i] = param; |
318 | } |
319 | return 0; |
320 | } |
321 | |
322 | #ifdef CONFIG_DEBUG_PAGEALLOC |
323 | int __read_mostly debug_pagealloc_enabled = 0; |
324 | #endif |
325 | |
326 | static int __init init_setup(char *str) |
327 | { |
328 | unsigned int i; |
329 | |
330 | execute_command = str; |
331 | /* |
332 | * In case LILO is going to boot us with default command line, |
333 | * it prepends "auto" before the whole cmdline which makes |
334 | * the shell think it should execute a script with such name. |
335 | * So we ignore all arguments entered _before_ init=... [MJ] |
336 | */ |
337 | for (i = 1; i < MAX_INIT_ARGS; i++) |
338 | argv_init[i] = NULL; |
339 | return 1; |
340 | } |
341 | __setup("init=", init_setup); |
342 | |
343 | static int __init rdinit_setup(char *str) |
344 | { |
345 | unsigned int i; |
346 | |
347 | ramdisk_execute_command = str; |
348 | /* See "auto" comment in init_setup */ |
349 | for (i = 1; i < MAX_INIT_ARGS; i++) |
350 | argv_init[i] = NULL; |
351 | return 1; |
352 | } |
353 | __setup("rdinit=", rdinit_setup); |
354 | |
355 | #ifndef CONFIG_SMP |
356 | |
357 | #ifdef CONFIG_X86_LOCAL_APIC |
358 | static void __init smp_init(void) |
359 | { |
360 | APIC_init_uniprocessor(); |
361 | } |
362 | #else |
363 | #define smp_init() do { } while (0) |
364 | #endif |
365 | |
366 | static inline void setup_nr_cpu_ids(void) { } |
367 | static inline void smp_prepare_cpus(unsigned int maxcpus) { } |
368 | |
369 | #else |
370 | |
371 | /* Setup number of possible processor ids */ |
372 | int nr_cpu_ids __read_mostly = NR_CPUS; |
373 | EXPORT_SYMBOL(nr_cpu_ids); |
374 | |
375 | /* An arch may set nr_cpu_ids earlier if needed, so this would be redundant */ |
376 | static void __init setup_nr_cpu_ids(void) |
377 | { |
378 | nr_cpu_ids = find_last_bit(cpumask_bits(cpu_possible_mask),NR_CPUS) + 1; |
379 | } |
380 | |
381 | /* Called by boot processor to activate the rest. */ |
382 | static void __init smp_init(void) |
383 | { |
384 | unsigned int cpu; |
385 | |
386 | /* FIXME: This should be done in userspace --RR */ |
387 | for_each_present_cpu(cpu) { |
388 | if (num_online_cpus() >= setup_max_cpus) |
389 | break; |
390 | if (!cpu_online(cpu)) |
391 | cpu_up(cpu); |
392 | } |
393 | |
394 | /* Any cleanup work */ |
395 | printk(KERN_INFO "Brought up %ld CPUs\n", (long)num_online_cpus()); |
396 | smp_cpus_done(setup_max_cpus); |
397 | } |
398 | |
399 | #endif |
400 | |
401 | /* |
402 | * We need to store the untouched command line for future reference. |
403 | * We also need to store the touched command line since the parameter |
404 | * parsing is performed in place, and we should allow a component to |
405 | * store reference of name/value for future reference. |
406 | */ |
407 | static void __init setup_command_line(char *command_line) |
408 | { |
409 | saved_command_line = alloc_bootmem(strlen (boot_command_line)+1); |
410 | static_command_line = alloc_bootmem(strlen (command_line)+1); |
411 | strcpy (saved_command_line, boot_command_line); |
412 | strcpy (static_command_line, command_line); |
413 | } |
414 | |
415 | /* |
416 | * We need to finalize in a non-__init function or else race conditions |
417 | * between the root thread and the init thread may cause start_kernel to |
418 | * be reaped by free_initmem before the root thread has proceeded to |
419 | * cpu_idle. |
420 | * |
421 | * gcc-3.4 accidentally inlines this function, so use noinline. |
422 | */ |
423 | |
424 | static noinline void __init_refok rest_init(void) |
425 | __releases(kernel_lock) |
426 | { |
427 | int pid; |
428 | |
429 | rcu_scheduler_starting(); |
430 | kernel_thread(kernel_init, NULL, CLONE_FS | CLONE_SIGHAND); |
431 | numa_default_policy(); |
432 | pid = kernel_thread(kthreadd, NULL, CLONE_FS | CLONE_FILES); |
433 | rcu_read_lock(); |
434 | kthreadd_task = find_task_by_pid_ns(pid, &init_pid_ns); |
435 | rcu_read_unlock(); |
436 | unlock_kernel(); |
437 | |
438 | /* |
439 | * The boot idle thread must execute schedule() |
440 | * at least once to get things moving: |
441 | */ |
442 | init_idle_bootup_task(current); |
443 | preempt_enable_no_resched(); |
444 | schedule(); |
445 | preempt_disable(); |
446 | |
447 | /* Call into cpu_idle with preempt disabled */ |
448 | cpu_idle(); |
449 | } |
450 | |
451 | /* Check for early params. */ |
452 | static int __init do_early_param(char *param, char *val) |
453 | { |
454 | struct obs_kernel_param *p; |
455 | |
456 | for (p = __setup_start; p < __setup_end; p++) { |
457 | if ((p->early && strcmp(param, p->str) == 0) || |
458 | (strcmp(param, "console") == 0 && |
459 | strcmp(p->str, "earlycon") == 0) |
460 | ) { |
461 | if (p->setup_func(val) != 0) |
462 | printk(KERN_WARNING |
463 | "Malformed early option '%s'\n", param); |
464 | } |
465 | } |
466 | /* We accept everything at this stage. */ |
467 | return 0; |
468 | } |
469 | |
470 | void __init parse_early_options(char *cmdline) |
471 | { |
472 | parse_args("early options", cmdline, NULL, 0, do_early_param); |
473 | } |
474 | |
475 | /* Arch code calls this early on, or if not, just before other parsing. */ |
476 | void __init parse_early_param(void) |
477 | { |
478 | static __initdata int done = 0; |
479 | static __initdata char tmp_cmdline[COMMAND_LINE_SIZE]; |
480 | |
481 | if (done) |
482 | return; |
483 | |
484 | /* All fall through to do_early_param. */ |
485 | strlcpy(tmp_cmdline, boot_command_line, COMMAND_LINE_SIZE); |
486 | parse_early_options(tmp_cmdline); |
487 | done = 1; |
488 | } |
489 | |
490 | /* |
491 | * Activate the first processor. |
492 | */ |
493 | |
494 | static void __init boot_cpu_init(void) |
495 | { |
496 | int cpu = smp_processor_id(); |
497 | /* Mark the boot cpu "present", "online" etc for SMP and UP case */ |
498 | set_cpu_online(cpu, true); |
499 | set_cpu_active(cpu, true); |
500 | set_cpu_present(cpu, true); |
501 | set_cpu_possible(cpu, true); |
502 | } |
503 | |
504 | void __init __weak smp_setup_processor_id(void) |
505 | { |
506 | } |
507 | |
508 | void __init __weak thread_info_cache_init(void) |
509 | { |
510 | } |
511 | |
512 | /* |
513 | * Set up kernel memory allocators |
514 | */ |
515 | static void __init mm_init(void) |
516 | { |
517 | /* |
518 | * page_cgroup requires countinous pages as memmap |
519 | * and it's bigger than MAX_ORDER unless SPARSEMEM. |
520 | */ |
521 | page_cgroup_init_flatmem(); |
522 | mem_init(); |
523 | kmem_cache_init(); |
524 | pgtable_cache_init(); |
525 | vmalloc_init(); |
526 | } |
527 | |
528 | asmlinkage void __init start_kernel(void) |
529 | { |
530 | char * command_line; |
531 | extern struct kernel_param __start___param[], __stop___param[]; |
532 | |
533 | smp_setup_processor_id(); |
534 | |
535 | /* |
536 | * Need to run as early as possible, to initialize the |
537 | * lockdep hash: |
538 | */ |
539 | lockdep_init(); |
540 | debug_objects_early_init(); |
541 | |
542 | /* |
543 | * Set up the the initial canary ASAP: |
544 | */ |
545 | boot_init_stack_canary(); |
546 | |
547 | cgroup_init_early(); |
548 | |
549 | local_irq_disable(); |
550 | early_boot_irqs_off(); |
551 | early_init_irq_lock_class(); |
552 | |
553 | /* |
554 | * Interrupts are still disabled. Do necessary setups, then |
555 | * enable them |
556 | */ |
557 | lock_kernel(); |
558 | tick_init(); |
559 | boot_cpu_init(); |
560 | page_address_init(); |
561 | printk(KERN_NOTICE "%s", linux_banner); |
562 | setup_arch(&command_line); |
563 | mm_init_owner(&init_mm, &init_task); |
564 | setup_command_line(command_line); |
565 | setup_nr_cpu_ids(); |
566 | setup_per_cpu_areas(); |
567 | smp_prepare_boot_cpu(); /* arch-specific boot-cpu hooks */ |
568 | |
569 | build_all_zonelists(); |
570 | page_alloc_init(); |
571 | |
572 | printk(KERN_NOTICE "Kernel command line: %s\n", boot_command_line); |
573 | parse_early_param(); |
574 | parse_args("Booting kernel", static_command_line, __start___param, |
575 | __stop___param - __start___param, |
576 | &unknown_bootoption); |
577 | /* |
578 | * These use large bootmem allocations and must precede |
579 | * kmem_cache_init() |
580 | */ |
581 | pidhash_init(); |
582 | vfs_caches_init_early(); |
583 | sort_main_extable(); |
584 | trap_init(); |
585 | mm_init(); |
586 | /* |
587 | * Set up the scheduler prior starting any interrupts (such as the |
588 | * timer interrupt). Full topology setup happens at smp_init() |
589 | * time - but meanwhile we still have a functioning scheduler. |
590 | */ |
591 | sched_init(); |
592 | /* |
593 | * Disable preemption - early bootup scheduling is extremely |
594 | * fragile until we cpu_idle() for the first time. |
595 | */ |
596 | preempt_disable(); |
597 | if (!irqs_disabled()) { |
598 | printk(KERN_WARNING "start_kernel(): bug: interrupts were " |
599 | "enabled *very* early, fixing it\n"); |
600 | local_irq_disable(); |
601 | } |
602 | rcu_init(); |
603 | radix_tree_init(); |
604 | /* init some links before init_ISA_irqs() */ |
605 | early_irq_init(); |
606 | init_IRQ(); |
607 | prio_tree_init(); |
608 | init_timers(); |
609 | hrtimers_init(); |
610 | softirq_init(); |
611 | timekeeping_init(); |
612 | time_init(); |
613 | profile_init(); |
614 | if (!irqs_disabled()) |
615 | printk(KERN_CRIT "start_kernel(): bug: interrupts were " |
616 | "enabled early\n"); |
617 | early_boot_irqs_on(); |
618 | local_irq_enable(); |
619 | |
620 | /* Interrupts are enabled now so all GFP allocations are safe. */ |
621 | gfp_allowed_mask = __GFP_BITS_MASK; |
622 | |
623 | kmem_cache_init_late(); |
624 | |
625 | /* |
626 | * HACK ALERT! This is early. We're enabling the console before |
627 | * we've done PCI setups etc, and console_init() must be aware of |
628 | * this. But we do want output early, in case something goes wrong. |
629 | */ |
630 | console_init(); |
631 | if (panic_later) |
632 | panic(panic_later, panic_param); |
633 | |
634 | lockdep_info(); |
635 | |
636 | /* |
637 | * Need to run this when irqs are enabled, because it wants |
638 | * to self-test [hard/soft]-irqs on/off lock inversion bugs |
639 | * too: |
640 | */ |
641 | locking_selftest(); |
642 | |
643 | #ifdef CONFIG_BLK_DEV_INITRD |
644 | if (initrd_start && !initrd_below_start_ok && |
645 | page_to_pfn(virt_to_page((void *)initrd_start)) < min_low_pfn) { |
646 | printk(KERN_CRIT "initrd overwritten (0x%08lx < 0x%08lx) - " |
647 | "disabling it.\n", |
648 | page_to_pfn(virt_to_page((void *)initrd_start)), |
649 | min_low_pfn); |
650 | initrd_start = 0; |
651 | } |
652 | #endif |
653 | page_cgroup_init(); |
654 | enable_debug_pagealloc(); |
655 | kmemtrace_init(); |
656 | kmemleak_init(); |
657 | debug_objects_mem_init(); |
658 | idr_init_cache(); |
659 | setup_per_cpu_pageset(); |
660 | numa_policy_init(); |
661 | if (late_time_init) |
662 | late_time_init(); |
663 | sched_clock_init(); |
664 | calibrate_delay(); |
665 | pidmap_init(); |
666 | anon_vma_init(); |
667 | #ifdef CONFIG_X86 |
668 | if (efi_enabled) |
669 | efi_enter_virtual_mode(); |
670 | #endif |
671 | thread_info_cache_init(); |
672 | cred_init(); |
673 | fork_init(totalram_pages); |
674 | proc_caches_init(); |
675 | buffer_init(); |
676 | key_init(); |
677 | security_init(); |
678 | vfs_caches_init(totalram_pages); |
679 | signals_init(); |
680 | /* rootfs populating might need page-writeback */ |
681 | page_writeback_init(); |
682 | #ifdef CONFIG_PROC_FS |
683 | proc_root_init(); |
684 | #endif |
685 | cgroup_init(); |
686 | cpuset_init(); |
687 | taskstats_init_early(); |
688 | delayacct_init(); |
689 | |
690 | check_bugs(); |
691 | |
692 | acpi_early_init(); /* before LAPIC and SMP init */ |
693 | sfi_init_late(); |
694 | |
695 | ftrace_init(); |
696 | |
697 | /* Do the rest non-__init'ed, we're now alive */ |
698 | rest_init(); |
699 | } |
700 | |
701 | /* Call all constructor functions linked into the kernel. */ |
702 | static void __init do_ctors(void) |
703 | { |
704 | #ifdef CONFIG_CONSTRUCTORS |
705 | ctor_fn_t *fn = (ctor_fn_t *) __ctors_start; |
706 | |
707 | for (; fn < (ctor_fn_t *) __ctors_end; fn++) |
708 | (*fn)(); |
709 | #endif |
710 | } |
711 | |
712 | int initcall_debug; |
713 | core_param(initcall_debug, initcall_debug, bool, 0644); |
714 | |
715 | static char msgbuf[64]; |
716 | static struct boot_trace_call call; |
717 | static struct boot_trace_ret ret; |
718 | |
719 | int do_one_initcall(initcall_t fn) |
720 | { |
721 | int count = preempt_count(); |
722 | ktime_t calltime, delta, rettime; |
723 | |
724 | if (initcall_debug) { |
725 | call.caller = task_pid_nr(current); |
726 | printk("calling %pF @ %i\n", fn, call.caller); |
727 | calltime = ktime_get(); |
728 | trace_boot_call(&call, fn); |
729 | enable_boot_trace(); |
730 | } |
731 | |
732 | ret.result = fn(); |
733 | |
734 | if (initcall_debug) { |
735 | disable_boot_trace(); |
736 | rettime = ktime_get(); |
737 | delta = ktime_sub(rettime, calltime); |
738 | ret.duration = (unsigned long long) ktime_to_ns(delta) >> 10; |
739 | trace_boot_ret(&ret, fn); |
740 | printk("initcall %pF returned %d after %Ld usecs\n", fn, |
741 | ret.result, ret.duration); |
742 | } |
743 | |
744 | msgbuf[0] = 0; |
745 | |
746 | if (ret.result && ret.result != -ENODEV && initcall_debug) |
747 | sprintf(msgbuf, "error code %d ", ret.result); |
748 | |
749 | if (preempt_count() != count) { |
750 | strlcat(msgbuf, "preemption imbalance ", sizeof(msgbuf)); |
751 | preempt_count() = count; |
752 | } |
753 | if (irqs_disabled()) { |
754 | strlcat(msgbuf, "disabled interrupts ", sizeof(msgbuf)); |
755 | local_irq_enable(); |
756 | } |
757 | if (msgbuf[0]) { |
758 | printk("initcall %pF returned with %s\n", fn, msgbuf); |
759 | } |
760 | |
761 | return ret.result; |
762 | } |
763 | |
764 | |
765 | extern initcall_t __initcall_start[], __initcall_end[], __early_initcall_end[]; |
766 | |
767 | static void __init do_initcalls(void) |
768 | { |
769 | initcall_t *fn; |
770 | |
771 | for (fn = __early_initcall_end; fn < __initcall_end; fn++) |
772 | do_one_initcall(*fn); |
773 | |
774 | /* Make sure there is no pending stuff from the initcall sequence */ |
775 | flush_scheduled_work(); |
776 | } |
777 | |
778 | /* |
779 | * Ok, the machine is now initialized. None of the devices |
780 | * have been touched yet, but the CPU subsystem is up and |
781 | * running, and memory and process management works. |
782 | * |
783 | * Now we can finally start doing some real work.. |
784 | */ |
785 | static void __init do_basic_setup(void) |
786 | { |
787 | init_workqueues(); |
788 | cpuset_init_smp(); |
789 | usermodehelper_init(); |
790 | init_tmpfs(); |
791 | driver_init(); |
792 | init_irq_proc(); |
793 | do_ctors(); |
794 | do_initcalls(); |
795 | } |
796 | |
797 | static void __init do_pre_smp_initcalls(void) |
798 | { |
799 | initcall_t *fn; |
800 | |
801 | for (fn = __initcall_start; fn < __early_initcall_end; fn++) |
802 | do_one_initcall(*fn); |
803 | } |
804 | |
805 | static void run_init_process(char *init_filename) |
806 | { |
807 | argv_init[0] = init_filename; |
808 | kernel_execve(init_filename, argv_init, envp_init); |
809 | } |
810 | |
811 | /* This is a non __init function. Force it to be noinline otherwise gcc |
812 | * makes it inline to init() and it becomes part of init.text section |
813 | */ |
814 | static noinline int init_post(void) |
815 | __releases(kernel_lock) |
816 | { |
817 | /* need to finish all async __init code before freeing the memory */ |
818 | async_synchronize_full(); |
819 | free_initmem(); |
820 | unlock_kernel(); |
821 | mark_rodata_ro(); |
822 | system_state = SYSTEM_RUNNING; |
823 | numa_default_policy(); |
824 | |
825 | |
826 | current->signal->flags |= SIGNAL_UNKILLABLE; |
827 | |
828 | if (ramdisk_execute_command) { |
829 | run_init_process(ramdisk_execute_command); |
830 | printk(KERN_WARNING "Failed to execute %s\n", |
831 | ramdisk_execute_command); |
832 | } |
833 | |
834 | /* |
835 | * We try each of these until one succeeds. |
836 | * |
837 | * The Bourne shell can be used instead of init if we are |
838 | * trying to recover a really broken machine. |
839 | */ |
840 | if (execute_command) { |
841 | run_init_process(execute_command); |
842 | printk(KERN_WARNING "Failed to execute %s. Attempting " |
843 | "defaults...\n", execute_command); |
844 | } |
845 | run_init_process("/sbin/init"); |
846 | run_init_process("/etc/init"); |
847 | run_init_process("/bin/init"); |
848 | run_init_process("/bin/sh"); |
849 | |
850 | panic("No init found. Try passing init= option to kernel. " |
851 | "See Linux Documentation/init.txt for guidance."); |
852 | } |
853 | |
854 | static int __init kernel_init(void * unused) |
855 | { |
856 | lock_kernel(); |
857 | |
858 | /* |
859 | * init can allocate pages on any node |
860 | */ |
861 | set_mems_allowed(node_states[N_HIGH_MEMORY]); |
862 | /* |
863 | * init can run on any cpu. |
864 | */ |
865 | set_cpus_allowed_ptr(current, cpu_all_mask); |
866 | /* |
867 | * Tell the world that we're going to be the grim |
868 | * reaper of innocent orphaned children. |
869 | * |
870 | * We don't want people to have to make incorrect |
871 | * assumptions about where in the task array this |
872 | * can be found. |
873 | */ |
874 | init_pid_ns.child_reaper = current; |
875 | |
876 | cad_pid = task_pid(current); |
877 | |
878 | smp_prepare_cpus(setup_max_cpus); |
879 | |
880 | do_pre_smp_initcalls(); |
881 | start_boot_trace(); |
882 | |
883 | smp_init(); |
884 | sched_init_smp(); |
885 | |
886 | do_basic_setup(); |
887 | |
888 | /* Open the /dev/console on the rootfs, this should never fail */ |
889 | if (sys_open((const char __user *) "/dev/console", O_RDWR, 0) < 0) |
890 | printk(KERN_WARNING "Warning: unable to open an initial console.\n"); |
891 | |
892 | (void) sys_dup(0); |
893 | (void) sys_dup(0); |
894 | /* |
895 | * check if there is an early userspace init. If yes, let it do all |
896 | * the work |
897 | */ |
898 | |
899 | if (!ramdisk_execute_command) |
900 | ramdisk_execute_command = "/init"; |
901 | |
902 | if (sys_access((const char __user *) ramdisk_execute_command, 0) != 0) { |
903 | ramdisk_execute_command = NULL; |
904 | prepare_namespace(); |
905 | } |
906 | |
907 | /* |
908 | * Ok, we have completed the initial bootup, and |
909 | * we're essentially up and running. Get rid of the |
910 | * initmem segments and start the user-mode stuff.. |
911 | */ |
912 | |
913 | init_post(); |
914 | return 0; |
915 | } |
916 |
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javiroman/ks7010
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9