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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#ifdef CONFIG_SMP
133
134unsigned int setup_max_cpus = NR_CPUS;
135EXPORT_SYMBOL(setup_max_cpus);
136
137
138
139
140
141
142
143
144
145
146
147
148
149void __weak arch_disable_smp_support(void) { }
150
151static int __init nosmp(char *str)
152{
153 setup_max_cpus = 0;
154 arch_disable_smp_support();
155
156 return 0;
157}
158
159early_param("nosmp", nosmp);
160
161
162static int __init nrcpus(char *str)
163{
164 int nr_cpus;
165
166 get_option(&str, &nr_cpus);
167 if (nr_cpus > 0 && nr_cpus < nr_cpu_ids)
168 nr_cpu_ids = nr_cpus;
169
170 return 0;
171}
172
173early_param("nr_cpus", nrcpus);
174
175static int __init maxcpus(char *str)
176{
177 get_option(&str, &setup_max_cpus);
178 if (setup_max_cpus == 0)
179 arch_disable_smp_support();
180
181 return 0;
182}
183
184early_param("maxcpus", maxcpus);
185#else
186static const unsigned int setup_max_cpus = NR_CPUS;
187#endif
188
189
190
191
192
193
194
195
196
197
198unsigned int reset_devices;
199EXPORT_SYMBOL(reset_devices);
200
201static int __init set_reset_devices(char *str)
202{
203 reset_devices = 1;
204 return 1;
205}
206
207__setup("reset_devices", set_reset_devices);
208
209static const char * argv_init[MAX_INIT_ARGS+2] = { "init", NULL, };
210const char * envp_init[MAX_INIT_ENVS+2] = { "HOME=/", "TERM=linux", NULL, };
211static const char *panic_later, *panic_param;
212
213extern const struct obs_kernel_param __setup_start[], __setup_end[];
214
215static int __init obsolete_checksetup(char *line)
216{
217 const struct obs_kernel_param *p;
218 int had_early_param = 0;
219
220 p = __setup_start;
221 do {
222 int n = strlen(p->str);
223 if (!strncmp(line, p->str, n)) {
224 if (p->early) {
225
226
227
228
229 if (line[n] == '\0' || line[n] == '=')
230 had_early_param = 1;
231 } else if (!p->setup_func) {
232 printk(KERN_WARNING "Parameter %s is obsolete,"
233 " ignored\n", p->str);
234 return 1;
235 } else if (p->setup_func(line + n))
236 return 1;
237 }
238 p++;
239 } while (p < __setup_end);
240
241 return had_early_param;
242}
243
244
245
246
247
248unsigned long loops_per_jiffy = (1<<12);
249
250EXPORT_SYMBOL(loops_per_jiffy);
251
252static int __init debug_kernel(char *str)
253{
254 console_loglevel = 10;
255 return 0;
256}
257
258static int __init quiet_kernel(char *str)
259{
260 console_loglevel = 4;
261 return 0;
262}
263
264early_param("debug", debug_kernel);
265early_param("quiet", quiet_kernel);
266
267static int __init loglevel(char *str)
268{
269 get_option(&str, &console_loglevel);
270 return 0;
271}
272
273early_param("loglevel", loglevel);
274
275
276
277
278
279static int __init unknown_bootoption(char *param, char *val)
280{
281
282 if (val) {
283
284 if (val == param+strlen(param)+1)
285 val[-1] = '=';
286 else if (val == param+strlen(param)+2) {
287 val[-2] = '=';
288 memmove(val-1, val, strlen(val)+1);
289 val--;
290 } else
291 BUG();
292 }
293
294
295 if (obsolete_checksetup(param))
296 return 0;
297
298
299 if (strchr(param, '.') && (!val || strchr(param, '.') < val))
300 return 0;
301
302 if (panic_later)
303 return 0;
304
305 if (val) {
306
307 unsigned int i;
308 for (i = 0; envp_init[i]; i++) {
309 if (i == MAX_INIT_ENVS) {
310 panic_later = "Too many boot env vars at `%s'";
311 panic_param = param;
312 }
313 if (!strncmp(param, envp_init[i], val - param))
314 break;
315 }
316 envp_init[i] = param;
317 } else {
318
319 unsigned int i;
320 for (i = 0; argv_init[i]; i++) {
321 if (i == MAX_INIT_ARGS) {
322 panic_later = "Too many boot init vars at `%s'";
323 panic_param = param;
324 }
325 }
326 argv_init[i] = param;
327 }
328 return 0;
329}
330
331#ifdef CONFIG_DEBUG_PAGEALLOC
332int __read_mostly debug_pagealloc_enabled = 0;
333#endif
334
335static int __init init_setup(char *str)
336{
337 unsigned int i;
338
339 execute_command = str;
340
341
342
343
344
345
346 for (i = 1; i < MAX_INIT_ARGS; i++)
347 argv_init[i] = NULL;
348 return 1;
349}
350__setup("init=", init_setup);
351
352static int __init rdinit_setup(char *str)
353{
354 unsigned int i;
355
356 ramdisk_execute_command = str;
357
358 for (i = 1; i < MAX_INIT_ARGS; i++)
359 argv_init[i] = NULL;
360 return 1;
361}
362__setup("rdinit=", rdinit_setup);
363
364#ifndef CONFIG_SMP
365
366#ifdef CONFIG_X86_LOCAL_APIC
367static void __init smp_init(void)
368{
369 APIC_init_uniprocessor();
370}
371#else
372#define smp_init() do { } while (0)
373#endif
374
375static inline void setup_nr_cpu_ids(void) { }
376static inline void smp_prepare_cpus(unsigned int maxcpus) { }
377
378#else
379
380
381int nr_cpu_ids __read_mostly = NR_CPUS;
382EXPORT_SYMBOL(nr_cpu_ids);
383
384
385static void __init setup_nr_cpu_ids(void)
386{
387 nr_cpu_ids = find_last_bit(cpumask_bits(cpu_possible_mask),NR_CPUS) + 1;
388}
389
390
391static void __init smp_init(void)
392{
393 unsigned int cpu;
394
395
396 for_each_present_cpu(cpu) {
397 if (num_online_cpus() >= setup_max_cpus)
398 break;
399 if (!cpu_online(cpu))
400 cpu_up(cpu);
401 }
402
403
404 printk(KERN_INFO "Brought up %ld CPUs\n", (long)num_online_cpus());
405 smp_cpus_done(setup_max_cpus);
406}
407
408#endif
409
410
411
412
413
414
415
416static void __init setup_command_line(char *command_line)
417{
418 saved_command_line = alloc_bootmem(strlen (boot_command_line)+1);
419 static_command_line = alloc_bootmem(strlen (command_line)+1);
420 strcpy (saved_command_line, boot_command_line);
421 strcpy (static_command_line, command_line);
422}
423
424
425
426
427
428
429
430
431
432
433static __initdata DECLARE_COMPLETION(kthreadd_done);
434
435static noinline void __init_refok rest_init(void)
436{
437 int pid;
438
439 rcu_scheduler_starting();
440
441
442
443
444
445 kernel_thread(kernel_init, NULL, CLONE_FS | CLONE_SIGHAND);
446 numa_default_policy();
447 pid = kernel_thread(kthreadd, NULL, CLONE_FS | CLONE_FILES);
448 rcu_read_lock();
449 kthreadd_task = find_task_by_pid_ns(pid, &init_pid_ns);
450 rcu_read_unlock();
451 complete(&kthreadd_done);
452
453
454
455
456
457 init_idle_bootup_task(current);
458 preempt_enable_no_resched();
459 schedule();
460 preempt_disable();
461
462
463 cpu_idle();
464}
465
466
467static int __init do_early_param(char *param, char *val)
468{
469 const struct obs_kernel_param *p;
470
471 for (p = __setup_start; p < __setup_end; p++) {
472 if ((p->early && strcmp(param, p->str) == 0) ||
473 (strcmp(param, "console") == 0 &&
474 strcmp(p->str, "earlycon") == 0)
475 ) {
476 if (p->setup_func(val) != 0)
477 printk(KERN_WARNING
478 "Malformed early option '%s'\n", param);
479 }
480 }
481
482 return 0;
483}
484
485void __init parse_early_options(char *cmdline)
486{
487 parse_args("early options", cmdline, NULL, 0, do_early_param);
488}
489
490
491void __init parse_early_param(void)
492{
493 static __initdata int done = 0;
494 static __initdata char tmp_cmdline[COMMAND_LINE_SIZE];
495
496 if (done)
497 return;
498
499
500 strlcpy(tmp_cmdline, boot_command_line, COMMAND_LINE_SIZE);
501 parse_early_options(tmp_cmdline);
502 done = 1;
503}
504
505
506
507
508
509static void __init boot_cpu_init(void)
510{
511 int cpu = smp_processor_id();
512
513 set_cpu_online(cpu, true);
514 set_cpu_active(cpu, true);
515 set_cpu_present(cpu, true);
516 set_cpu_possible(cpu, true);
517}
518
519void __init __weak smp_setup_processor_id(void)
520{
521}
522
523void __init __weak thread_info_cache_init(void)
524{
525}
526
527
528
529
530static void __init mm_init(void)
531{
532
533
534
535
536 page_cgroup_init_flatmem();
537 mem_init();
538 kmem_cache_init();
539 percpu_init_late();
540 pgtable_cache_init();
541 vmalloc_init();
542}
543
544asmlinkage void __init start_kernel(void)
545{
546 char * command_line;
547 extern const struct kernel_param __start___param[], __stop___param[];
548
549 smp_setup_processor_id();
550
551
552
553
554
555 lockdep_init();
556 debug_objects_early_init();
557
558
559
560
561 boot_init_stack_canary();
562
563 cgroup_init_early();
564
565 local_irq_disable();
566 early_boot_irqs_disabled = true;
567
568
569
570
571
572 tick_init();
573 boot_cpu_init();
574 page_address_init();
575 printk(KERN_NOTICE "%s", linux_banner);
576 setup_arch(&command_line);
577 mm_init_owner(&init_mm, &init_task);
578 setup_command_line(command_line);
579 setup_nr_cpu_ids();
580 setup_per_cpu_areas();
581 smp_prepare_boot_cpu();
582
583 build_all_zonelists(NULL);
584 page_alloc_init();
585
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
592
593
594
595 pidhash_init();
596 vfs_caches_init_early();
597 sort_main_extable();
598 trap_init();
599 mm_init();
600
601
602
603
604
605 sched_init();
606
607
608
609
610 preempt_disable();
611 if (!irqs_disabled()) {
612 printk(KERN_WARNING "start_kernel(): bug: interrupts were "
613 "enabled *very* early, fixing it\n");
614 local_irq_disable();
615 }
616 idr_init_cache();
617 perf_event_init();
618 rcu_init();
619 radix_tree_init();
620
621 early_irq_init();
622 init_IRQ();
623 prio_tree_init();
624 init_timers();
625 hrtimers_init();
626 softirq_init();
627 timekeeping_init();
628 time_init();
629 profile_init();
630 if (!irqs_disabled())
631 printk(KERN_CRIT "start_kernel(): bug: interrupts were "
632 "enabled early\n");
633 early_boot_irqs_disabled = false;
634 local_irq_enable();
635
636
637 gfp_allowed_mask = __GFP_BITS_MASK;
638
639 kmem_cache_init_late();
640
641
642
643
644
645
646 console_init();
647 if (panic_later)
648 panic(panic_later, panic_param);
649
650 lockdep_info();
651
652
653
654
655
656
657 locking_selftest();
658
659#ifdef CONFIG_BLK_DEV_INITRD
660 if (initrd_start && !initrd_below_start_ok &&
661 page_to_pfn(virt_to_page((void *)initrd_start)) < min_low_pfn) {
662 printk(KERN_CRIT "initrd overwritten (0x%08lx < 0x%08lx) - "
663 "disabling it.\n",
664 page_to_pfn(virt_to_page((void *)initrd_start)),
665 min_low_pfn);
666 initrd_start = 0;
667 }
668#endif
669 page_cgroup_init();
670 enable_debug_pagealloc();
671 kmemleak_init();
672 debug_objects_mem_init();
673 setup_per_cpu_pageset();
674 numa_policy_init();
675 if (late_time_init)
676 late_time_init();
677 sched_clock_init();
678 calibrate_delay();
679 pidmap_init();
680 anon_vma_init();
681#ifdef CONFIG_X86
682 if (efi_enabled)
683 efi_enter_virtual_mode();
684#endif
685 thread_info_cache_init();
686 cred_init();
687 fork_init(totalram_pages);
688 proc_caches_init();
689 buffer_init();
690 key_init();
691 security_init();
692 dbg_late_init();
693 vfs_caches_init(totalram_pages);
694 signals_init();
695
696 page_writeback_init();
697#ifdef CONFIG_PROC_FS
698 proc_root_init();
699#endif
700 cgroup_init();
701 cpuset_init();
702 taskstats_init_early();
703 delayacct_init();
704
705 check_bugs();
706
707 acpi_early_init();
708 sfi_init_late();
709
710 ftrace_init();
711
712
713 rest_init();
714}
715
716
717static void __init do_ctors(void)
718{
719#ifdef CONFIG_CONSTRUCTORS
720 ctor_fn_t *fn = (ctor_fn_t *) __ctors_start;
721
722 for (; fn < (ctor_fn_t *) __ctors_end; fn++)
723 (*fn)();
724#endif
725}
726
727int initcall_debug;
728core_param(initcall_debug, initcall_debug, bool, 0644);
729
730static char msgbuf[64];
731
732static int __init_or_module do_one_initcall_debug(initcall_t fn)
733{
734 ktime_t calltime, delta, rettime;
735 unsigned long long duration;
736 int ret;
737
738 printk(KERN_DEBUG "calling %pF @ %i\n", fn, task_pid_nr(current));
739 calltime = ktime_get();
740 ret = fn();
741 rettime = ktime_get();
742 delta = ktime_sub(rettime, calltime);
743 duration = (unsigned long long) ktime_to_ns(delta) >> 10;
744 printk(KERN_DEBUG "initcall %pF returned %d after %lld usecs\n", fn,
745 ret, duration);
746
747 return ret;
748}
749
750int __init_or_module do_one_initcall(initcall_t fn)
751{
752 int count = preempt_count();
753 int ret;
754
755 if (initcall_debug)
756 ret = do_one_initcall_debug(fn);
757 else
758 ret = fn();
759
760 msgbuf[0] = 0;
761
762 if (ret && ret != -ENODEV && initcall_debug)
763 sprintf(msgbuf, "error code %d ", ret);
764
765 if (preempt_count() != count) {
766 strlcat(msgbuf, "preemption imbalance ", sizeof(msgbuf));
767 preempt_count() = count;
768 }
769 if (irqs_disabled()) {
770 strlcat(msgbuf, "disabled interrupts ", sizeof(msgbuf));
771 local_irq_enable();
772 }
773 if (msgbuf[0]) {
774 printk("initcall %pF returned with %s\n", fn, msgbuf);
775 }
776
777 return ret;
778}
779
780
781extern initcall_t __initcall_start[], __initcall_end[], __early_initcall_end[];
782
783static void __init do_initcalls(void)
784{
785 initcall_t *fn;
786
787 for (fn = __early_initcall_end; fn < __initcall_end; fn++)
788 do_one_initcall(*fn);
789}
790
791
792
793
794
795
796
797
798static void __init do_basic_setup(void)
799{
800 cpuset_init_smp();
801 usermodehelper_init();
802 init_tmpfs();
803 driver_init();
804 init_irq_proc();
805 do_ctors();
806 do_initcalls();
807}
808
809static void __init do_pre_smp_initcalls(void)
810{
811 initcall_t *fn;
812
813 for (fn = __initcall_start; fn < __early_initcall_end; fn++)
814 do_one_initcall(*fn);
815}
816
817static void run_init_process(const char *init_filename)
818{
819 argv_init[0] = init_filename;
820 kernel_execve(init_filename, argv_init, envp_init);
821}
822
823
824
825
826static noinline int init_post(void)
827{
828
829 async_synchronize_full();
830 free_initmem();
831 mark_rodata_ro();
832 system_state = SYSTEM_RUNNING;
833 numa_default_policy();
834
835
836 current->signal->flags |= SIGNAL_UNKILLABLE;
837
838 if (ramdisk_execute_command) {
839 run_init_process(ramdisk_execute_command);
840 printk(KERN_WARNING "Failed to execute %s\n",
841 ramdisk_execute_command);
842 }
843
844
845
846
847
848
849
850 if (execute_command) {
851 run_init_process(execute_command);
852 printk(KERN_WARNING "Failed to execute %s. Attempting "
853 "defaults...\n", execute_command);
854 }
855 run_init_process("/sbin/init");
856 run_init_process("/etc/init");
857 run_init_process("/bin/init");
858 run_init_process("/bin/sh");
859
860 panic("No init found. Try passing init= option to kernel. "
861 "See Linux Documentation/init.txt for guidance.");
862}
863
864static int __init kernel_init(void * unused)
865{
866
867
868
869 wait_for_completion(&kthreadd_done);
870
871
872
873 set_mems_allowed(node_states[N_HIGH_MEMORY]);
874
875
876
877 set_cpus_allowed_ptr(current, cpu_all_mask);
878
879
880
881
882
883
884
885
886 init_pid_ns.child_reaper = current;
887
888 cad_pid = task_pid(current);
889
890 smp_prepare_cpus(setup_max_cpus);
891
892 do_pre_smp_initcalls();
893 lockup_detector_init();
894
895 smp_init();
896 sched_init_smp();
897
898 do_basic_setup();
899
900
901 if (sys_open((const char __user *) "/dev/console", O_RDWR, 0) < 0)
902 printk(KERN_WARNING "Warning: unable to open an initial console.\n");
903
904 (void) sys_dup(0);
905 (void) sys_dup(0);
906
907
908
909
910
911 if (!ramdisk_execute_command)
912 ramdisk_execute_command = "/init";
913
914 if (sys_access((const char __user *) ramdisk_execute_command, 0) != 0) {
915 ramdisk_execute_command = NULL;
916 prepare_namespace();
917 }
918
919
920
921
922
923
924
925 init_post();
926 return 0;
927}
928