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12#include <linux/types.h>
13#include <linux/module.h>
14#include <linux/proc_fs.h>
15#include <linux/kernel.h>
16#include <linux/syscalls.h>
17#include <linux/stackprotector.h>
18#include <linux/string.h>
19#include <linux/ctype.h>
20#include <linux/delay.h>
21#include <linux/ioport.h>
22#include <linux/init.h>
23#include <linux/initrd.h>
24#include <linux/bootmem.h>
25#include <linux/acpi.h>
26#include <linux/tty.h>
27#include <linux/percpu.h>
28#include <linux/kmod.h>
29#include <linux/vmalloc.h>
30#include <linux/kernel_stat.h>
31#include <linux/start_kernel.h>
32#include <linux/security.h>
33#include <linux/smp.h>
34#include <linux/profile.h>
35#include <linux/rcupdate.h>
36#include <linux/moduleparam.h>
37#include <linux/kallsyms.h>
38#include <linux/writeback.h>
39#include <linux/cpu.h>
40#include <linux/cpuset.h>
41#include <linux/cgroup.h>
42#include <linux/efi.h>
43#include <linux/tick.h>
44#include <linux/interrupt.h>
45#include <linux/taskstats_kern.h>
46#include <linux/delayacct.h>
47#include <linux/unistd.h>
48#include <linux/rmap.h>
49#include <linux/mempolicy.h>
50#include <linux/key.h>
51#include <linux/buffer_head.h>
52#include <linux/page_cgroup.h>
53#include <linux/debug_locks.h>
54#include <linux/debugobjects.h>
55#include <linux/lockdep.h>
56#include <linux/kmemleak.h>
57#include <linux/pid_namespace.h>
58#include <linux/device.h>
59#include <linux/kthread.h>
60#include <linux/sched.h>
61#include <linux/signal.h>
62#include <linux/idr.h>
63#include <linux/kgdb.h>
64#include <linux/ftrace.h>
65#include <linux/async.h>
66#include <linux/kmemcheck.h>
67#include <linux/sfi.h>
68#include <linux/shmem_fs.h>
69#include <linux/slab.h>
70#include <linux/perf_event.h>
71
72#include <asm/io.h>
73#include <asm/bugs.h>
74#include <asm/setup.h>
75#include <asm/sections.h>
76#include <asm/cacheflush.h>
77
78#ifdef CONFIG_X86_LOCAL_APIC
79#include <asm/smp.h>
80#endif
81
82static int kernel_init(void *);
83
84extern void init_IRQ(void);
85extern void fork_init(unsigned long);
86extern void mca_init(void);
87extern void sbus_init(void);
88extern void prio_tree_init(void);
89extern void radix_tree_init(void);
90extern void free_initmem(void);
91#ifndef CONFIG_DEBUG_RODATA
92static inline void mark_rodata_ro(void) { }
93#endif
94
95#ifdef CONFIG_TC
96extern void tc_init(void);
97#endif
98
99
100
101
102
103
104
105
106bool early_boot_irqs_disabled __read_mostly;
107
108enum system_states system_state __read_mostly;
109EXPORT_SYMBOL(system_state);
110
111
112
113
114#define MAX_INIT_ARGS CONFIG_INIT_ENV_ARG_LIMIT
115#define MAX_INIT_ENVS CONFIG_INIT_ENV_ARG_LIMIT
116
117extern void time_init(void);
118
119void (*__initdata late_time_init)(void);
120extern void softirq_init(void);
121
122
123char __initdata boot_command_line[COMMAND_LINE_SIZE];
124
125char *saved_command_line;
126
127static char *static_command_line;
128
129static char *execute_command;
130static char *ramdisk_execute_command;
131
132
133
134
135
136
137
138
139
140
141unsigned int reset_devices;
142EXPORT_SYMBOL(reset_devices);
143
144static int __init set_reset_devices(char *str)
145{
146 reset_devices = 1;
147 return 1;
148}
149
150__setup("reset_devices", set_reset_devices);
151
152static const char * argv_init[MAX_INIT_ARGS+2] = { "init", NULL, };
153const char * envp_init[MAX_INIT_ENVS+2] = { "HOME=/", "TERM=linux", NULL, };
154static const char *panic_later, *panic_param;
155
156extern const struct obs_kernel_param __setup_start[], __setup_end[];
157
158static int __init obsolete_checksetup(char *line)
159{
160 const struct obs_kernel_param *p;
161 int had_early_param = 0;
162
163 p = __setup_start;
164 do {
165 int n = strlen(p->str);
166 if (parameqn(line, p->str, n)) {
167 if (p->early) {
168
169
170
171
172 if (line[n] == '\0' || line[n] == '=')
173 had_early_param = 1;
174 } else if (!p->setup_func) {
175 printk(KERN_WARNING "Parameter %s is obsolete,"
176 " ignored\n", p->str);
177 return 1;
178 } else if (p->setup_func(line + n))
179 return 1;
180 }
181 p++;
182 } while (p < __setup_end);
183
184 return had_early_param;
185}
186
187
188
189
190
191unsigned long loops_per_jiffy = (1<<12);
192
193EXPORT_SYMBOL(loops_per_jiffy);
194
195static int __init debug_kernel(char *str)
196{
197 console_loglevel = 10;
198 return 0;
199}
200
201static int __init quiet_kernel(char *str)
202{
203 console_loglevel = 4;
204 return 0;
205}
206
207early_param("debug", debug_kernel);
208early_param("quiet", quiet_kernel);
209
210static int __init loglevel(char *str)
211{
212 int newlevel;
213
214
215
216
217
218
219 if (get_option(&str, &newlevel)) {
220 console_loglevel = newlevel;
221 return 0;
222 }
223
224 return -EINVAL;
225}
226
227early_param("loglevel", loglevel);
228
229
230
231
232
233static int __init unknown_bootoption(char *param, char *val)
234{
235
236 if (val) {
237
238 if (val == param+strlen(param)+1)
239 val[-1] = '=';
240 else if (val == param+strlen(param)+2) {
241 val[-2] = '=';
242 memmove(val-1, val, strlen(val)+1);
243 val--;
244 } else
245 BUG();
246 }
247
248
249 if (obsolete_checksetup(param))
250 return 0;
251
252
253 if (strchr(param, '.') && (!val || strchr(param, '.') < val))
254 return 0;
255
256 if (panic_later)
257 return 0;
258
259 if (val) {
260
261 unsigned int i;
262 for (i = 0; envp_init[i]; i++) {
263 if (i == MAX_INIT_ENVS) {
264 panic_later = "Too many boot env vars at `%s'";
265 panic_param = param;
266 }
267 if (!strncmp(param, envp_init[i], val - param))
268 break;
269 }
270 envp_init[i] = param;
271 } else {
272
273 unsigned int i;
274 for (i = 0; argv_init[i]; i++) {
275 if (i == MAX_INIT_ARGS) {
276 panic_later = "Too many boot init vars at `%s'";
277 panic_param = param;
278 }
279 }
280 argv_init[i] = param;
281 }
282 return 0;
283}
284
285#ifdef CONFIG_DEBUG_PAGEALLOC
286int __read_mostly debug_pagealloc_enabled = 0;
287#endif
288
289static int __init init_setup(char *str)
290{
291 unsigned int i;
292
293 execute_command = str;
294
295
296
297
298
299
300 for (i = 1; i < MAX_INIT_ARGS; i++)
301 argv_init[i] = NULL;
302 return 1;
303}
304__setup("init=", init_setup);
305
306static int __init rdinit_setup(char *str)
307{
308 unsigned int i;
309
310 ramdisk_execute_command = str;
311
312 for (i = 1; i < MAX_INIT_ARGS; i++)
313 argv_init[i] = NULL;
314 return 1;
315}
316__setup("rdinit=", rdinit_setup);
317
318#ifndef CONFIG_SMP
319static const unsigned int setup_max_cpus = NR_CPUS;
320#ifdef CONFIG_X86_LOCAL_APIC
321static void __init smp_init(void)
322{
323 APIC_init_uniprocessor();
324}
325#else
326#define smp_init() do { } while (0)
327#endif
328
329static inline void setup_nr_cpu_ids(void) { }
330static inline void smp_prepare_cpus(unsigned int maxcpus) { }
331#endif
332
333
334
335
336
337
338
339static void __init setup_command_line(char *command_line)
340{
341 saved_command_line = alloc_bootmem(strlen (boot_command_line)+1);
342 static_command_line = alloc_bootmem(strlen (command_line)+1);
343 strcpy (saved_command_line, boot_command_line);
344 strcpy (static_command_line, command_line);
345}
346
347
348
349
350
351
352
353
354
355
356static __initdata DECLARE_COMPLETION(kthreadd_done);
357
358static noinline void __init_refok rest_init(void)
359{
360 int pid;
361
362 rcu_scheduler_starting();
363
364
365
366
367
368 kernel_thread(kernel_init, NULL, CLONE_FS | CLONE_SIGHAND);
369 numa_default_policy();
370 pid = kernel_thread(kthreadd, NULL, CLONE_FS | CLONE_FILES);
371 rcu_read_lock();
372 kthreadd_task = find_task_by_pid_ns(pid, &init_pid_ns);
373 rcu_read_unlock();
374 complete(&kthreadd_done);
375
376
377
378
379
380 init_idle_bootup_task(current);
381 preempt_enable_no_resched();
382 schedule();
383
384
385 preempt_disable();
386 cpu_idle();
387}
388
389
390static int __init do_early_param(char *param, char *val)
391{
392 const struct obs_kernel_param *p;
393
394 for (p = __setup_start; p < __setup_end; p++) {
395 if ((p->early && parameq(param, p->str)) ||
396 (strcmp(param, "console") == 0 &&
397 strcmp(p->str, "earlycon") == 0)
398 ) {
399 if (p->setup_func(val) != 0)
400 printk(KERN_WARNING
401 "Malformed early option '%s'\n", param);
402 }
403 }
404
405 return 0;
406}
407
408void __init parse_early_options(char *cmdline)
409{
410 parse_args("early options", cmdline, NULL, 0, do_early_param);
411}
412
413
414void __init parse_early_param(void)
415{
416 static __initdata int done = 0;
417 static __initdata char tmp_cmdline[COMMAND_LINE_SIZE];
418
419 if (done)
420 return;
421
422
423 strlcpy(tmp_cmdline, boot_command_line, COMMAND_LINE_SIZE);
424 parse_early_options(tmp_cmdline);
425 done = 1;
426}
427
428
429
430
431
432static void __init boot_cpu_init(void)
433{
434 int cpu = smp_processor_id();
435
436 set_cpu_online(cpu, true);
437 set_cpu_active(cpu, true);
438 set_cpu_present(cpu, true);
439 set_cpu_possible(cpu, true);
440}
441
442void __init __weak smp_setup_processor_id(void)
443{
444}
445
446void __init __weak thread_info_cache_init(void)
447{
448}
449
450
451
452
453static void __init mm_init(void)
454{
455
456
457
458
459 page_cgroup_init_flatmem();
460 mem_init();
461 kmem_cache_init();
462 percpu_init_late();
463 pgtable_cache_init();
464 vmalloc_init();
465}
466
467asmlinkage void __init start_kernel(void)
468{
469 char * command_line;
470 extern const struct kernel_param __start___param[], __stop___param[];
471
472 smp_setup_processor_id();
473
474
475
476
477
478 lockdep_init();
479 debug_objects_early_init();
480
481
482
483
484 boot_init_stack_canary();
485
486 cgroup_init_early();
487
488 local_irq_disable();
489 early_boot_irqs_disabled = true;
490
491
492
493
494
495 tick_init();
496 boot_cpu_init();
497 page_address_init();
498 printk(KERN_NOTICE "%s", linux_banner);
499 setup_arch(&command_line);
500 mm_init_owner(&init_mm, &init_task);
501 mm_init_cpumask(&init_mm);
502 setup_command_line(command_line);
503 setup_nr_cpu_ids();
504 setup_per_cpu_areas();
505 smp_prepare_boot_cpu();
506
507 build_all_zonelists(NULL);
508 page_alloc_init();
509
510 printk(KERN_NOTICE "Kernel command line: %s\n", boot_command_line);
511 parse_early_param();
512 parse_args("Booting kernel", static_command_line, __start___param,
513 __stop___param - __start___param,
514 &unknown_bootoption);
515
516 jump_label_init();
517
518
519
520
521
522 setup_log_buf(0);
523 pidhash_init();
524 vfs_caches_init_early();
525 sort_main_extable();
526 trap_init();
527 mm_init();
528
529
530
531
532
533
534 sched_init();
535
536
537
538
539 preempt_disable();
540 if (!irqs_disabled()) {
541 printk(KERN_WARNING "start_kernel(): bug: interrupts were "
542 "enabled *very* early, fixing it\n");
543 local_irq_disable();
544 }
545 idr_init_cache();
546 perf_event_init();
547 rcu_init();
548 radix_tree_init();
549
550 early_irq_init();
551 init_IRQ();
552 prio_tree_init();
553 init_timers();
554 hrtimers_init();
555 softirq_init();
556 timekeeping_init();
557 time_init();
558 profile_init();
559 call_function_init();
560 if (!irqs_disabled())
561 printk(KERN_CRIT "start_kernel(): bug: interrupts were "
562 "enabled early\n");
563 early_boot_irqs_disabled = false;
564 local_irq_enable();
565
566
567 gfp_allowed_mask = __GFP_BITS_MASK;
568
569 kmem_cache_init_late();
570
571
572
573
574
575
576 console_init();
577 if (panic_later)
578 panic(panic_later, panic_param);
579
580 lockdep_info();
581
582
583
584
585
586
587 locking_selftest();
588
589#ifdef CONFIG_BLK_DEV_INITRD
590 if (initrd_start && !initrd_below_start_ok &&
591 page_to_pfn(virt_to_page((void *)initrd_start)) < min_low_pfn) {
592 printk(KERN_CRIT "initrd overwritten (0x%08lx < 0x%08lx) - "
593 "disabling it.\n",
594 page_to_pfn(virt_to_page((void *)initrd_start)),
595 min_low_pfn);
596 initrd_start = 0;
597 }
598#endif
599 page_cgroup_init();
600 enable_debug_pagealloc();
601 debug_objects_mem_init();
602 kmemleak_init();
603 setup_per_cpu_pageset();
604 numa_policy_init();
605 if (late_time_init)
606 late_time_init();
607 sched_clock_init();
608 calibrate_delay();
609 pidmap_init();
610 anon_vma_init();
611#ifdef CONFIG_X86
612 if (efi_enabled)
613 efi_enter_virtual_mode();
614#endif
615 thread_info_cache_init();
616 cred_init();
617 fork_init(totalram_pages);
618 proc_caches_init();
619 buffer_init();
620 key_init();
621 security_init();
622 dbg_late_init();
623 vfs_caches_init(totalram_pages);
624 signals_init();
625
626 page_writeback_init();
627#ifdef CONFIG_PROC_FS
628 proc_root_init();
629#endif
630 cgroup_init();
631 cpuset_init();
632 taskstats_init_early();
633 delayacct_init();
634
635 check_bugs();
636
637 acpi_early_init();
638 sfi_init_late();
639
640 ftrace_init();
641
642
643 rest_init();
644}
645
646
647static 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
657int initcall_debug;
658core_param(initcall_debug, initcall_debug, bool, 0644);
659
660static char msgbuf[64];
661
662static int __init_or_module do_one_initcall_debug(initcall_t fn)
663{
664 ktime_t calltime, delta, rettime;
665 unsigned long long duration;
666 int ret;
667
668 printk(KERN_DEBUG "calling %pF @ %i\n", fn, task_pid_nr(current));
669 calltime = ktime_get();
670 ret = fn();
671 rettime = ktime_get();
672 delta = ktime_sub(rettime, calltime);
673 duration = (unsigned long long) ktime_to_ns(delta) >> 10;
674 printk(KERN_DEBUG "initcall %pF returned %d after %lld usecs\n", fn,
675 ret, duration);
676
677 return ret;
678}
679
680int __init_or_module do_one_initcall(initcall_t fn)
681{
682 int count = preempt_count();
683 int ret;
684
685 if (initcall_debug)
686 ret = do_one_initcall_debug(fn);
687 else
688 ret = fn();
689
690 msgbuf[0] = 0;
691
692 if (ret && ret != -ENODEV && initcall_debug)
693 sprintf(msgbuf, "error code %d ", ret);
694
695 if (preempt_count() != count) {
696 strlcat(msgbuf, "preemption imbalance ", sizeof(msgbuf));
697 preempt_count() = count;
698 }
699 if (irqs_disabled()) {
700 strlcat(msgbuf, "disabled interrupts ", sizeof(msgbuf));
701 local_irq_enable();
702 }
703 if (msgbuf[0]) {
704 printk("initcall %pF returned with %s\n", fn, msgbuf);
705 }
706
707 return ret;
708}
709
710
711extern initcall_t __initcall_start[], __initcall_end[], __early_initcall_end[];
712
713static void __init do_initcalls(void)
714{
715 initcall_t *fn;
716
717 for (fn = __early_initcall_end; fn < __initcall_end; fn++)
718 do_one_initcall(*fn);
719}
720
721
722
723
724
725
726
727
728static void __init do_basic_setup(void)
729{
730 cpuset_init_smp();
731 usermodehelper_init();
732 shmem_init();
733 driver_init();
734 init_irq_proc();
735 do_ctors();
736 usermodehelper_enable();
737 do_initcalls();
738}
739
740static void __init do_pre_smp_initcalls(void)
741{
742 initcall_t *fn;
743
744 for (fn = __initcall_start; fn < __early_initcall_end; fn++)
745 do_one_initcall(*fn);
746}
747
748static void run_init_process(const char *init_filename)
749{
750 argv_init[0] = init_filename;
751 kernel_execve(init_filename, argv_init, envp_init);
752}
753
754
755
756
757static noinline int init_post(void)
758{
759
760 async_synchronize_full();
761 free_initmem();
762 mark_rodata_ro();
763 system_state = SYSTEM_RUNNING;
764 numa_default_policy();
765
766
767 current->signal->flags |= SIGNAL_UNKILLABLE;
768
769 if (ramdisk_execute_command) {
770 run_init_process(ramdisk_execute_command);
771 printk(KERN_WARNING "Failed to execute %s\n",
772 ramdisk_execute_command);
773 }
774
775
776
777
778
779
780
781 if (execute_command) {
782 run_init_process(execute_command);
783 printk(KERN_WARNING "Failed to execute %s. Attempting "
784 "defaults...\n", execute_command);
785 }
786 run_init_process("/sbin/init");
787 run_init_process("/etc/init");
788 run_init_process("/bin/init");
789 run_init_process("/bin/sh");
790
791 panic("No init found. Try passing init= option to kernel. "
792 "See Linux Documentation/init.txt for guidance.");
793}
794
795static int __init kernel_init(void * unused)
796{
797
798
799
800 wait_for_completion(&kthreadd_done);
801
802
803
804 set_mems_allowed(node_states[N_HIGH_MEMORY]);
805
806
807
808 set_cpus_allowed_ptr(current, cpu_all_mask);
809
810 cad_pid = task_pid(current);
811
812 smp_prepare_cpus(setup_max_cpus);
813
814 do_pre_smp_initcalls();
815 lockup_detector_init();
816
817 smp_init();
818 sched_init_smp();
819
820 do_basic_setup();
821
822
823 if (sys_open((const char __user *) "/dev/console", O_RDWR, 0) < 0)
824 printk(KERN_WARNING "Warning: unable to open an initial console.\n");
825
826 (void) sys_dup(0);
827 (void) sys_dup(0);
828
829
830
831
832
833 if (!ramdisk_execute_command)
834 ramdisk_execute_command = "/init";
835
836 if (sys_access((const char __user *) ramdisk_execute_command, 0) != 0) {
837 ramdisk_execute_command = NULL;
838 prepare_namespace();
839 }
840
841
842
843
844
845
846
847 init_post();
848 return 0;
849}
850