1
2
3
4
5
6
7
8
9
10
11
12#define DEBUG
13
14#include <linux/types.h>
15#include <linux/module.h>
16#include <linux/proc_fs.h>
17#include <linux/kernel.h>
18#include <linux/syscalls.h>
19#include <linux/stackprotector.h>
20#include <linux/string.h>
21#include <linux/ctype.h>
22#include <linux/delay.h>
23#include <linux/ioport.h>
24#include <linux/init.h>
25#include <linux/initrd.h>
26#include <linux/bootmem.h>
27#include <linux/acpi.h>
28#include <linux/tty.h>
29#include <linux/percpu.h>
30#include <linux/kmod.h>
31#include <linux/vmalloc.h>
32#include <linux/kernel_stat.h>
33#include <linux/start_kernel.h>
34#include <linux/security.h>
35#include <linux/smp.h>
36#include <linux/profile.h>
37#include <linux/rcupdate.h>
38#include <linux/moduleparam.h>
39#include <linux/kallsyms.h>
40#include <linux/writeback.h>
41#include <linux/cpu.h>
42#include <linux/cpuset.h>
43#include <linux/cgroup.h>
44#include <linux/efi.h>
45#include <linux/tick.h>
46#include <linux/interrupt.h>
47#include <linux/taskstats_kern.h>
48#include <linux/delayacct.h>
49#include <linux/unistd.h>
50#include <linux/rmap.h>
51#include <linux/mempolicy.h>
52#include <linux/key.h>
53#include <linux/buffer_head.h>
54#include <linux/page_cgroup.h>
55#include <linux/debug_locks.h>
56#include <linux/debugobjects.h>
57#include <linux/lockdep.h>
58#include <linux/kmemleak.h>
59#include <linux/pid_namespace.h>
60#include <linux/device.h>
61#include <linux/kthread.h>
62#include <linux/sched.h>
63#include <linux/signal.h>
64#include <linux/idr.h>
65#include <linux/kgdb.h>
66#include <linux/ftrace.h>
67#include <linux/async.h>
68#include <linux/kmemcheck.h>
69#include <linux/sfi.h>
70#include <linux/shmem_fs.h>
71#include <linux/slab.h>
72#include <linux/perf_event.h>
73#include <linux/file.h>
74#include <linux/ptrace.h>
75#include <linux/blkdev.h>
76#include <linux/elevator.h>
77#include <linux/sched_clock.h>
78
79#include <asm/io.h>
80#include <asm/bugs.h>
81#include <asm/setup.h>
82#include <asm/sections.h>
83#include <asm/cacheflush.h>
84
85#ifdef CONFIG_X86_LOCAL_APIC
86#include <asm/smp.h>
87#endif
88
89static int kernel_init(void *);
90
91extern void init_IRQ(void);
92extern void fork_init(unsigned long);
93extern void mca_init(void);
94extern void sbus_init(void);
95extern void radix_tree_init(void);
96#ifndef CONFIG_DEBUG_RODATA
97static inline void mark_rodata_ro(void) { }
98#endif
99
100#ifdef CONFIG_TC
101extern void tc_init(void);
102#endif
103
104
105
106
107
108
109
110
111bool early_boot_irqs_disabled __read_mostly;
112
113enum system_states system_state __read_mostly;
114EXPORT_SYMBOL(system_state);
115
116
117
118
119#define MAX_INIT_ARGS CONFIG_INIT_ENV_ARG_LIMIT
120#define MAX_INIT_ENVS CONFIG_INIT_ENV_ARG_LIMIT
121
122extern void time_init(void);
123
124void (*__initdata late_time_init)(void);
125extern void softirq_init(void);
126
127
128char __initdata boot_command_line[COMMAND_LINE_SIZE];
129
130char *saved_command_line;
131
132static char *static_command_line;
133
134static char *execute_command;
135static char *ramdisk_execute_command;
136
137
138
139
140
141
142
143
144
145
146unsigned int reset_devices;
147EXPORT_SYMBOL(reset_devices);
148
149static int __init set_reset_devices(char *str)
150{
151 reset_devices = 1;
152 return 1;
153}
154
155__setup("reset_devices", set_reset_devices);
156
157static const char * argv_init[MAX_INIT_ARGS+2] = { "init", NULL, };
158const char * envp_init[MAX_INIT_ENVS+2] = { "HOME=/", "TERM=linux", NULL, };
159static const char *panic_later, *panic_param;
160
161extern const struct obs_kernel_param __setup_start[], __setup_end[];
162
163static int __init obsolete_checksetup(char *line)
164{
165 const struct obs_kernel_param *p;
166 int had_early_param = 0;
167
168 p = __setup_start;
169 do {
170 int n = strlen(p->str);
171 if (parameqn(line, p->str, n)) {
172 if (p->early) {
173
174
175
176
177 if (line[n] == '\0' || line[n] == '=')
178 had_early_param = 1;
179 } else if (!p->setup_func) {
180 pr_warn("Parameter %s is obsolete, ignored\n",
181 p->str);
182 return 1;
183 } else if (p->setup_func(line + n))
184 return 1;
185 }
186 p++;
187 } while (p < __setup_end);
188
189 return had_early_param;
190}
191
192
193
194
195
196unsigned long loops_per_jiffy = (1<<12);
197
198EXPORT_SYMBOL(loops_per_jiffy);
199
200static int __init debug_kernel(char *str)
201{
202 console_loglevel = 10;
203 return 0;
204}
205
206static int __init quiet_kernel(char *str)
207{
208 console_loglevel = 4;
209 return 0;
210}
211
212early_param("debug", debug_kernel);
213early_param("quiet", quiet_kernel);
214
215static int __init loglevel(char *str)
216{
217 int newlevel;
218
219
220
221
222
223
224 if (get_option(&str, &newlevel)) {
225 console_loglevel = newlevel;
226 return 0;
227 }
228
229 return -EINVAL;
230}
231
232early_param("loglevel", loglevel);
233
234
235static int __init repair_env_string(char *param, char *val, const char *unused)
236{
237 if (val) {
238
239 if (val == param+strlen(param)+1)
240 val[-1] = '=';
241 else if (val == param+strlen(param)+2) {
242 val[-2] = '=';
243 memmove(val-1, val, strlen(val)+1);
244 val--;
245 } else
246 BUG();
247 }
248 return 0;
249}
250
251
252
253
254
255static int __init unknown_bootoption(char *param, char *val, const char *unused)
256{
257 repair_env_string(param, val, unused);
258
259
260 if (obsolete_checksetup(param))
261 return 0;
262
263
264 if (strchr(param, '.') && (!val || strchr(param, '.') < val))
265 return 0;
266
267 if (panic_later)
268 return 0;
269
270 if (val) {
271
272 unsigned int i;
273 for (i = 0; envp_init[i]; i++) {
274 if (i == MAX_INIT_ENVS) {
275 panic_later = "Too many boot env vars at `%s'";
276 panic_param = param;
277 }
278 if (!strncmp(param, envp_init[i], val - param))
279 break;
280 }
281 envp_init[i] = param;
282 } else {
283
284 unsigned int i;
285 for (i = 0; argv_init[i]; i++) {
286 if (i == MAX_INIT_ARGS) {
287 panic_later = "Too many boot init vars at `%s'";
288 panic_param = param;
289 }
290 }
291 argv_init[i] = param;
292 }
293 return 0;
294}
295
296static int __init init_setup(char *str)
297{
298 unsigned int i;
299
300 execute_command = str;
301
302
303
304
305
306
307 for (i = 1; i < MAX_INIT_ARGS; i++)
308 argv_init[i] = NULL;
309 return 1;
310}
311__setup("init=", init_setup);
312
313static int __init rdinit_setup(char *str)
314{
315 unsigned int i;
316
317 ramdisk_execute_command = str;
318
319 for (i = 1; i < MAX_INIT_ARGS; i++)
320 argv_init[i] = NULL;
321 return 1;
322}
323__setup("rdinit=", rdinit_setup);
324
325#ifndef CONFIG_SMP
326static const unsigned int setup_max_cpus = NR_CPUS;
327#ifdef CONFIG_X86_LOCAL_APIC
328static void __init smp_init(void)
329{
330 APIC_init_uniprocessor();
331}
332#else
333#define smp_init() do { } while (0)
334#endif
335
336static inline void setup_nr_cpu_ids(void) { }
337static inline void smp_prepare_cpus(unsigned int maxcpus) { }
338#endif
339
340
341
342
343
344
345
346static void __init setup_command_line(char *command_line)
347{
348 saved_command_line = alloc_bootmem(strlen (boot_command_line)+1);
349 static_command_line = alloc_bootmem(strlen (command_line)+1);
350 strcpy (saved_command_line, boot_command_line);
351 strcpy (static_command_line, command_line);
352}
353
354
355
356
357
358
359
360
361
362
363static __initdata DECLARE_COMPLETION(kthreadd_done);
364
365static noinline void __init_refok rest_init(void)
366{
367 int pid;
368
369 rcu_scheduler_starting();
370
371
372
373
374
375 kernel_thread(kernel_init, NULL, CLONE_FS | CLONE_SIGHAND);
376 numa_default_policy();
377 pid = kernel_thread(kthreadd, NULL, CLONE_FS | CLONE_FILES);
378 rcu_read_lock();
379 kthreadd_task = find_task_by_pid_ns(pid, &init_pid_ns);
380 rcu_read_unlock();
381 complete(&kthreadd_done);
382
383
384
385
386
387 init_idle_bootup_task(current);
388 schedule_preempt_disabled();
389
390 cpu_startup_entry(CPUHP_ONLINE);
391}
392
393
394static int __init do_early_param(char *param, char *val, const char *unused)
395{
396 const struct obs_kernel_param *p;
397
398 for (p = __setup_start; p < __setup_end; p++) {
399 if ((p->early && parameq(param, p->str)) ||
400 (strcmp(param, "console") == 0 &&
401 strcmp(p->str, "earlycon") == 0)
402 ) {
403 if (p->setup_func(val) != 0)
404 pr_warn("Malformed early option '%s'\n", param);
405 }
406 }
407
408 return 0;
409}
410
411void __init parse_early_options(char *cmdline)
412{
413 parse_args("early options", cmdline, NULL, 0, 0, 0, do_early_param);
414}
415
416
417void __init parse_early_param(void)
418{
419 static __initdata int done = 0;
420 static __initdata char tmp_cmdline[COMMAND_LINE_SIZE];
421
422 if (done)
423 return;
424
425
426 strlcpy(tmp_cmdline, boot_command_line, COMMAND_LINE_SIZE);
427 parse_early_options(tmp_cmdline);
428 done = 1;
429}
430
431
432
433
434
435static void __init boot_cpu_init(void)
436{
437 int cpu = smp_processor_id();
438
439 set_cpu_online(cpu, true);
440 set_cpu_active(cpu, true);
441 set_cpu_present(cpu, true);
442 set_cpu_possible(cpu, true);
443}
444
445void __init __weak smp_setup_processor_id(void)
446{
447}
448
449# if THREAD_SIZE >= PAGE_SIZE
450void __init __weak thread_info_cache_init(void)
451{
452}
453#endif
454
455
456
457
458static void __init mm_init(void)
459{
460
461
462
463
464 page_cgroup_init_flatmem();
465 mem_init();
466 kmem_cache_init();
467 percpu_init_late();
468 pgtable_cache_init();
469 vmalloc_init();
470}
471
472asmlinkage void __init start_kernel(void)
473{
474 char * command_line;
475 extern const struct kernel_param __start___param[], __stop___param[];
476
477
478
479
480
481 lockdep_init();
482 smp_setup_processor_id();
483 debug_objects_early_init();
484
485
486
487
488 boot_init_stack_canary();
489
490 cgroup_init_early();
491
492 local_irq_disable();
493 early_boot_irqs_disabled = true;
494
495
496
497
498
499 boot_cpu_init();
500 page_address_init();
501 pr_notice("%s", linux_banner);
502 setup_arch(&command_line);
503 mm_init_owner(&init_mm, &init_task);
504 mm_init_cpumask(&init_mm);
505 setup_command_line(command_line);
506 setup_nr_cpu_ids();
507 setup_per_cpu_areas();
508 smp_prepare_boot_cpu();
509
510 build_all_zonelists(NULL, NULL);
511 page_alloc_init();
512
513 pr_notice("Kernel command line: %s\n", boot_command_line);
514 parse_early_param();
515 parse_args("Booting kernel", static_command_line, __start___param,
516 __stop___param - __start___param,
517 -1, -1, &unknown_bootoption);
518
519 jump_label_init();
520
521
522
523
524
525 setup_log_buf(0);
526 pidhash_init();
527 vfs_caches_init_early();
528 sort_main_extable();
529 trap_init();
530 mm_init();
531
532
533
534
535
536
537 sched_init();
538
539
540
541
542 preempt_disable();
543 if (WARN(!irqs_disabled(), "Interrupts were enabled *very* early, fixing it\n"))
544 local_irq_disable();
545 idr_init_cache();
546 rcu_init();
547 tick_nohz_init();
548 radix_tree_init();
549
550 early_irq_init();
551 init_IRQ();
552 tick_init();
553 init_timers();
554 hrtimers_init();
555 softirq_init();
556 timekeeping_init();
557 time_init();
558 sched_clock_postinit();
559 perf_event_init();
560 profile_init();
561 call_function_init();
562 WARN(!irqs_disabled(), "Interrupts were enabled early\n");
563 early_boot_irqs_disabled = false;
564 local_irq_enable();
565
566 kmem_cache_init_late();
567
568
569
570
571
572
573 console_init();
574 if (panic_later)
575 panic(panic_later, panic_param);
576
577 lockdep_info();
578
579
580
581
582
583
584 locking_selftest();
585
586#ifdef CONFIG_BLK_DEV_INITRD
587 if (initrd_start && !initrd_below_start_ok &&
588 page_to_pfn(virt_to_page((void *)initrd_start)) < min_low_pfn) {
589 pr_crit("initrd overwritten (0x%08lx < 0x%08lx) - disabling it.\n",
590 page_to_pfn(virt_to_page((void *)initrd_start)),
591 min_low_pfn);
592 initrd_start = 0;
593 }
594#endif
595 page_cgroup_init();
596 debug_objects_mem_init();
597 kmemleak_init();
598 setup_per_cpu_pageset();
599 numa_policy_init();
600 if (late_time_init)
601 late_time_init();
602 sched_clock_init();
603 calibrate_delay();
604 pidmap_init();
605 anon_vma_init();
606#ifdef CONFIG_X86
607 if (efi_enabled(EFI_RUNTIME_SERVICES))
608 efi_enter_virtual_mode();
609#endif
610 thread_info_cache_init();
611 cred_init();
612 fork_init(totalram_pages);
613 proc_caches_init();
614 buffer_init();
615 key_init();
616 security_init();
617 dbg_late_init();
618 vfs_caches_init(totalram_pages);
619 signals_init();
620
621 page_writeback_init();
622#ifdef CONFIG_PROC_FS
623 proc_root_init();
624#endif
625 cgroup_init();
626 cpuset_init();
627 taskstats_init_early();
628 delayacct_init();
629
630 check_bugs();
631
632 acpi_early_init();
633 sfi_init_late();
634
635 if (efi_enabled(EFI_RUNTIME_SERVICES)) {
636 efi_late_init();
637 efi_free_boot_services();
638 }
639
640 ftrace_init();
641
642
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
657bool initcall_debug;
658core_param(initcall_debug, initcall_debug, bool, 0644);
659
660static int __init_or_module do_one_initcall_debug(initcall_t fn)
661{
662 ktime_t calltime, delta, rettime;
663 unsigned long long duration;
664 int ret;
665
666 pr_debug("calling %pF @ %i\n", fn, task_pid_nr(current));
667 calltime = ktime_get();
668 ret = fn();
669 rettime = ktime_get();
670 delta = ktime_sub(rettime, calltime);
671 duration = (unsigned long long) ktime_to_ns(delta) >> 10;
672 pr_debug("initcall %pF returned %d after %lld usecs\n",
673 fn, ret, duration);
674
675 return ret;
676}
677
678int __init_or_module do_one_initcall(initcall_t fn)
679{
680 int count = preempt_count();
681 int ret;
682 char msgbuf[64];
683
684 if (initcall_debug)
685 ret = do_one_initcall_debug(fn);
686 else
687 ret = fn();
688
689 msgbuf[0] = 0;
690
691 if (preempt_count() != count) {
692 sprintf(msgbuf, "preemption imbalance ");
693 preempt_count() = count;
694 }
695 if (irqs_disabled()) {
696 strlcat(msgbuf, "disabled interrupts ", sizeof(msgbuf));
697 local_irq_enable();
698 }
699 WARN(msgbuf[0], "initcall %pF returned with %s\n", fn, msgbuf);
700
701 return ret;
702}
703
704
705extern initcall_t __initcall_start[];
706extern initcall_t __initcall0_start[];
707extern initcall_t __initcall1_start[];
708extern initcall_t __initcall2_start[];
709extern initcall_t __initcall3_start[];
710extern initcall_t __initcall4_start[];
711extern initcall_t __initcall5_start[];
712extern initcall_t __initcall6_start[];
713extern initcall_t __initcall7_start[];
714extern initcall_t __initcall_end[];
715
716static initcall_t *initcall_levels[] __initdata = {
717 __initcall0_start,
718 __initcall1_start,
719 __initcall2_start,
720 __initcall3_start,
721 __initcall4_start,
722 __initcall5_start,
723 __initcall6_start,
724 __initcall7_start,
725 __initcall_end,
726};
727
728
729static char *initcall_level_names[] __initdata = {
730 "early",
731 "core",
732 "postcore",
733 "arch",
734 "subsys",
735 "fs",
736 "device",
737 "late",
738};
739
740static void __init do_initcall_level(int level)
741{
742 extern const struct kernel_param __start___param[], __stop___param[];
743 initcall_t *fn;
744
745 strcpy(static_command_line, saved_command_line);
746 parse_args(initcall_level_names[level],
747 static_command_line, __start___param,
748 __stop___param - __start___param,
749 level, level,
750 &repair_env_string);
751
752 for (fn = initcall_levels[level]; fn < initcall_levels[level+1]; fn++)
753 do_one_initcall(*fn);
754}
755
756static void __init do_initcalls(void)
757{
758 int level;
759
760 for (level = 0; level < ARRAY_SIZE(initcall_levels) - 1; level++)
761 do_initcall_level(level);
762}
763
764
765
766
767
768
769
770
771static void __init do_basic_setup(void)
772{
773 cpuset_init_smp();
774 usermodehelper_init();
775 shmem_init();
776 driver_init();
777 init_irq_proc();
778 do_ctors();
779 usermodehelper_enable();
780 do_initcalls();
781}
782
783static void __init do_pre_smp_initcalls(void)
784{
785 initcall_t *fn;
786
787 for (fn = __initcall_start; fn < __initcall0_start; fn++)
788 do_one_initcall(*fn);
789}
790
791
792
793
794
795
796
797void __init load_default_modules(void)
798{
799 load_default_elevator_module();
800}
801
802static int run_init_process(const char *init_filename)
803{
804 argv_init[0] = init_filename;
805 return do_execve(init_filename,
806 (const char __user *const __user *)argv_init,
807 (const char __user *const __user *)envp_init);
808}
809
810static noinline void __init kernel_init_freeable(void);
811
812static int __ref kernel_init(void *unused)
813{
814 kernel_init_freeable();
815
816 async_synchronize_full();
817 free_initmem();
818 mark_rodata_ro();
819 system_state = SYSTEM_RUNNING;
820 numa_default_policy();
821
822 flush_delayed_fput();
823
824 if (ramdisk_execute_command) {
825 if (!run_init_process(ramdisk_execute_command))
826 return 0;
827 pr_err("Failed to execute %s\n", ramdisk_execute_command);
828 }
829
830
831
832
833
834
835
836 if (execute_command) {
837 if (!run_init_process(execute_command))
838 return 0;
839 pr_err("Failed to execute %s. Attempting defaults...\n",
840 execute_command);
841 }
842 if (!run_init_process("/sbin/init") ||
843 !run_init_process("/etc/init") ||
844 !run_init_process("/bin/init") ||
845 !run_init_process("/bin/sh"))
846 return 0;
847
848 panic("No init found. Try passing init= option to kernel. "
849 "See Linux Documentation/init.txt for guidance.");
850}
851
852static noinline void __init kernel_init_freeable(void)
853{
854
855
856
857 wait_for_completion(&kthreadd_done);
858
859
860 gfp_allowed_mask = __GFP_BITS_MASK;
861
862
863
864
865 set_mems_allowed(node_states[N_MEMORY]);
866
867
868
869 set_cpus_allowed_ptr(current, cpu_all_mask);
870
871 cad_pid = task_pid(current);
872
873 smp_prepare_cpus(setup_max_cpus);
874
875 do_pre_smp_initcalls();
876 lockup_detector_init();
877
878 smp_init();
879 sched_init_smp();
880
881 do_basic_setup();
882
883
884 if (sys_open((const char __user *) "/dev/console", O_RDWR, 0) < 0)
885 pr_err("Warning: unable to open an initial console.\n");
886
887 (void) sys_dup(0);
888 (void) sys_dup(0);
889
890
891
892
893
894 if (!ramdisk_execute_command)
895 ramdisk_execute_command = "/init";
896
897 if (sys_access((const char __user *) ramdisk_execute_command, 0) != 0) {
898 ramdisk_execute_command = NULL;
899 prepare_namespace();
900 }
901
902
903
904
905
906
907
908
909 load_default_modules();
910}
911