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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/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 * Debug helper: via this flag we know that we are in 'early bootup code'
101 * where only the boot processor is running with IRQ disabled. This means
102 * two things - IRQ must not be enabled before the flag is cleared and some
103 * operations which are not allowed with IRQ disabled are allowed while the
104 * flag is set.
105 */
106bool early_boot_irqs_disabled __read_mostly;
107
108enum system_states system_state __read_mostly;
109EXPORT_SYMBOL(system_state);
110
111/*
112 * Boot command-line arguments
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/* Default late time init is NULL. archs can override this later. */
119void (*__initdata late_time_init)(void);
120extern void softirq_init(void);
121
122/* Untouched command line saved by arch-specific code. */
123char __initdata boot_command_line[COMMAND_LINE_SIZE];
124/* Untouched saved command line (eg. for /proc) */
125char *saved_command_line;
126/* Command line for parameter parsing */
127static char *static_command_line;
128
129static char *execute_command;
130static char *ramdisk_execute_command;
131
132/*
133 * If set, this is an indication to the drivers that reset the underlying
134 * device before going ahead with the initialization otherwise driver might
135 * rely on the BIOS and skip the reset operation.
136 *
137 * This is useful if kernel is booting in an unreliable environment.
138 * For ex. kdump situaiton where previous kernel has crashed, BIOS has been
139 * skipped and devices will be in unknown state.
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 (!strncmp(line, p->str, n)) {
167 if (p->early) {
168 /* Already done in parse_early_param?
169 * (Needs exact match on param part).
170 * Keep iterating, as we can have early
171 * params and __setups of same names 8( */
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 * This should be approx 2 Bo*oMips to start (note initial shift), and will
189 * still work even if initially too large, it will just take slightly longer
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 * Only update loglevel value when a correct setting was passed,
216 * to prevent blind crashes (when loglevel being set to 0) that
217 * are quite hard to debug
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 * Unknown boot options get handed to init, unless they look like
231 * unused parameters (modprobe will find them in /proc/cmdline).
232 */
233static int __init unknown_bootoption(char *param, char *val)
234{
235 /* Change NUL term back to "=", to make "param" the whole string. */
236 if (val) {
237 /* param=val or param="val"? */
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 /* Handle obsolete-style parameters */
249 if (obsolete_checksetup(param))
250 return 0;
251
252 /* Unused module parameter. */
253 if (strchr(param, '.') && (!val || strchr(param, '.') < val))
254 return 0;
255
256 if (panic_later)
257 return 0;
258
259 if (val) {
260 /* Environment option */
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 /* Command line option */
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 * In case LILO is going to boot us with default command line,
296 * it prepends "auto" before the whole cmdline which makes
297 * the shell think it should execute a script with such name.
298 * So we ignore all arguments entered _before_ init=... [MJ]
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 /* See "auto" comment in init_setup */
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 * We need to store the untouched command line for future reference.
335 * We also need to store the touched command line since the parameter
336 * parsing is performed in place, and we should allow a component to
337 * store reference of name/value for future reference.
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 * We need to finalize in a non-__init function or else race conditions
349 * between the root thread and the init thread may cause start_kernel to
350 * be reaped by free_initmem before the root thread has proceeded to
351 * cpu_idle.
352 *
353 * gcc-3.4 accidentally inlines this function, so use noinline.
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 * We need to spawn init first so that it obtains pid 1, however
365 * the init task will end up wanting to create kthreads, which, if
366 * we schedule it before we create kthreadd, will OOPS.
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 * The boot idle thread must execute schedule()
378 * at least once to get things moving:
379 */
380 init_idle_bootup_task(current);
381 preempt_enable_no_resched();
382 schedule();
383
384 /* Call into cpu_idle with preempt disabled */
385 preempt_disable();
386 cpu_idle();
387}
388
389/* Check for early params. */
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 && strcmp(param, p->str) == 0) ||
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 /* We accept everything at this stage. */
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/* Arch code calls this early on, or if not, just before other parsing. */
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 /* All fall through to do_early_param. */
423 strlcpy(tmp_cmdline, boot_command_line, COMMAND_LINE_SIZE);
424 parse_early_options(tmp_cmdline);
425 done = 1;
426}
427
428/*
429 * Activate the first processor.
430 */
431
432static void __init boot_cpu_init(void)
433{
434 int cpu = smp_processor_id();
435 /* Mark the boot cpu "present", "online" etc for SMP and UP case */
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 * Set up kernel memory allocators
452 */
453static void __init mm_init(void)
454{
455 /*
456 * page_cgroup requires countinous pages as memmap
457 * and it's bigger than MAX_ORDER unless SPARSEMEM.
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 * Need to run as early as possible, to initialize the
476 * lockdep hash:
477 */
478 lockdep_init();
479 debug_objects_early_init();
480
481 /*
482 * Set up the the initial canary ASAP:
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 * Interrupts are still disabled. Do necessary setups, then
493 * enable them
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(); /* arch-specific boot-cpu hooks */
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 * These use large bootmem allocations and must precede
517 * kmem_cache_init()
518 */
519 setup_log_buf(0);
520 pidhash_init();
521 vfs_caches_init_early();
522 sort_main_extable();
523 trap_init();
524 mm_init();
525
526 /*
527 * Set up the scheduler prior starting any interrupts (such as the
528 * timer interrupt). Full topology setup happens at smp_init()
529 * time - but meanwhile we still have a functioning scheduler.
530 */
531 sched_init();
532 /*
533 * Disable preemption - early bootup scheduling is extremely
534 * fragile until we cpu_idle() for the first time.
535 */
536 preempt_disable();
537 if (!irqs_disabled()) {
538 printk(KERN_WARNING "start_kernel(): bug: interrupts were "
539 "enabled *very* early, fixing it\n");
540 local_irq_disable();
541 }
542 idr_init_cache();
543 perf_event_init();
544 rcu_init();
545 radix_tree_init();
546 /* init some links before init_ISA_irqs() */
547 early_irq_init();
548 init_IRQ();
549 prio_tree_init();
550 init_timers();
551 hrtimers_init();
552 softirq_init();
553 timekeeping_init();
554 time_init();
555 profile_init();
556 call_function_init();
557 if (!irqs_disabled())
558 printk(KERN_CRIT "start_kernel(): bug: interrupts were "
559 "enabled early\n");
560 early_boot_irqs_disabled = false;
561 local_irq_enable();
562
563 /* Interrupts are enabled now so all GFP allocations are safe. */
564 gfp_allowed_mask = __GFP_BITS_MASK;
565
566 kmem_cache_init_late();
567
568 /*
569 * HACK ALERT! This is early. We're enabling the console before
570 * we've done PCI setups etc, and console_init() must be aware of
571 * this. But we do want output early, in case something goes wrong.
572 */
573 console_init();
574 if (panic_later)
575 panic(panic_later, panic_param);
576
577 lockdep_info();
578
579 /*
580 * Need to run this when irqs are enabled, because it wants
581 * to self-test [hard/soft]-irqs on/off lock inversion bugs
582 * too:
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 printk(KERN_CRIT "initrd overwritten (0x%08lx < 0x%08lx) - "
590 "disabling it.\n",
591 page_to_pfn(virt_to_page((void *)initrd_start)),
592 min_low_pfn);
593 initrd_start = 0;
594 }
595#endif
596 page_cgroup_init();
597 enable_debug_pagealloc();
598 debug_objects_mem_init();
599 kmemleak_init();
600 setup_per_cpu_pageset();
601 numa_policy_init();
602 if (late_time_init)
603 late_time_init();
604 sched_clock_init();
605 calibrate_delay();
606 pidmap_init();
607 anon_vma_init();
608#ifdef CONFIG_X86
609 if (efi_enabled)
610 efi_enter_virtual_mode();
611#endif
612 thread_info_cache_init();
613 cred_init();
614 fork_init(totalram_pages);
615 proc_caches_init();
616 buffer_init();
617 key_init();
618 security_init();
619 dbg_late_init();
620 vfs_caches_init(totalram_pages);
621 signals_init();
622 /* rootfs populating might need page-writeback */
623 page_writeback_init();
624#ifdef CONFIG_PROC_FS
625 proc_root_init();
626#endif
627 cgroup_init();
628 cpuset_init();
629 taskstats_init_early();
630 delayacct_init();
631
632 check_bugs();
633
634 acpi_early_init(); /* before LAPIC and SMP init */
635 sfi_init_late();
636
637 ftrace_init();
638
639 /* Do the rest non-__init'ed, we're now alive */
640 rest_init();
641}
642
643/* Call all constructor functions linked into the kernel. */
644static void __init do_ctors(void)
645{
646#ifdef CONFIG_CONSTRUCTORS
647 ctor_fn_t *fn = (ctor_fn_t *) __ctors_start;
648
649 for (; fn < (ctor_fn_t *) __ctors_end; fn++)
650 (*fn)();
651#endif
652}
653
654int initcall_debug;
655core_param(initcall_debug, initcall_debug, bool, 0644);
656
657static char msgbuf[64];
658
659static int __init_or_module do_one_initcall_debug(initcall_t fn)
660{
661 ktime_t calltime, delta, rettime;
662 unsigned long long duration;
663 int ret;
664
665 printk(KERN_DEBUG "calling %pF @ %i\n", fn, task_pid_nr(current));
666 calltime = ktime_get();
667 ret = fn();
668 rettime = ktime_get();
669 delta = ktime_sub(rettime, calltime);
670 duration = (unsigned long long) ktime_to_ns(delta) >> 10;
671 printk(KERN_DEBUG "initcall %pF returned %d after %lld usecs\n", fn,
672 ret, duration);
673
674 return ret;
675}
676
677int __init_or_module do_one_initcall(initcall_t fn)
678{
679 int count = preempt_count();
680 int ret;
681
682 if (initcall_debug)
683 ret = do_one_initcall_debug(fn);
684 else
685 ret = fn();
686
687 msgbuf[0] = 0;
688
689 if (ret && ret != -ENODEV && initcall_debug)
690 sprintf(msgbuf, "error code %d ", ret);
691
692 if (preempt_count() != count) {
693 strlcat(msgbuf, "preemption imbalance ", sizeof(msgbuf));
694 preempt_count() = count;
695 }
696 if (irqs_disabled()) {
697 strlcat(msgbuf, "disabled interrupts ", sizeof(msgbuf));
698 local_irq_enable();
699 }
700 if (msgbuf[0]) {
701 printk("initcall %pF returned with %s\n", fn, msgbuf);
702 }
703
704 return ret;
705}
706
707
708extern initcall_t __initcall_start[], __initcall_end[], __early_initcall_end[];
709
710static void __init do_initcalls(void)
711{
712 initcall_t *fn;
713
714 for (fn = __early_initcall_end; fn < __initcall_end; fn++)
715 do_one_initcall(*fn);
716}
717
718/*
719 * Ok, the machine is now initialized. None of the devices
720 * have been touched yet, but the CPU subsystem is up and
721 * running, and memory and process management works.
722 *
723 * Now we can finally start doing some real work..
724 */
725static void __init do_basic_setup(void)
726{
727 cpuset_init_smp();
728 usermodehelper_init();
729 shmem_init();
730 driver_init();
731 init_irq_proc();
732 do_ctors();
733 usermodehelper_enable();
734 do_initcalls();
735}
736
737static void __init do_pre_smp_initcalls(void)
738{
739 initcall_t *fn;
740
741 for (fn = __initcall_start; fn < __early_initcall_end; fn++)
742 do_one_initcall(*fn);
743}
744
745static void run_init_process(const char *init_filename)
746{
747 argv_init[0] = init_filename;
748 kernel_execve(init_filename, argv_init, envp_init);
749}
750
751/* This is a non __init function. Force it to be noinline otherwise gcc
752 * makes it inline to init() and it becomes part of init.text section
753 */
754static noinline int init_post(void)
755{
756 /* need to finish all async __init code before freeing the memory */
757 async_synchronize_full();
758 free_initmem();
759 mark_rodata_ro();
760 system_state = SYSTEM_RUNNING;
761 numa_default_policy();
762
763
764 current->signal->flags |= SIGNAL_UNKILLABLE;
765
766 if (ramdisk_execute_command) {
767 run_init_process(ramdisk_execute_command);
768 printk(KERN_WARNING "Failed to execute %s\n",
769 ramdisk_execute_command);
770 }
771
772 /*
773 * We try each of these until one succeeds.
774 *
775 * The Bourne shell can be used instead of init if we are
776 * trying to recover a really broken machine.
777 */
778 if (execute_command) {
779 run_init_process(execute_command);
780 printk(KERN_WARNING "Failed to execute %s. Attempting "
781 "defaults...\n", execute_command);
782 }
783 run_init_process("/sbin/init");
784 run_init_process("/etc/init");
785 run_init_process("/bin/init");
786 run_init_process("/bin/sh");
787
788 panic("No init found. Try passing init= option to kernel. "
789 "See Linux Documentation/init.txt for guidance.");
790}
791
792static int __init kernel_init(void * unused)
793{
794 /*
795 * Wait until kthreadd is all set-up.
796 */
797 wait_for_completion(&kthreadd_done);
798 /*
799 * init can allocate pages on any node
800 */
801 set_mems_allowed(node_states[N_HIGH_MEMORY]);
802 /*
803 * init can run on any cpu.
804 */
805 set_cpus_allowed_ptr(current, cpu_all_mask);
806
807 cad_pid = task_pid(current);
808
809 smp_prepare_cpus(setup_max_cpus);
810
811 do_pre_smp_initcalls();
812 lockup_detector_init();
813
814 smp_init();
815 sched_init_smp();
816
817 do_basic_setup();
818
819 /* Open the /dev/console on the rootfs, this should never fail */
820 if (sys_open((const char __user *) "/dev/console", O_RDWR, 0) < 0)
821 printk(KERN_WARNING "Warning: unable to open an initial console.\n");
822
823 (void) sys_dup(0);
824 (void) sys_dup(0);
825 /*
826 * check if there is an early userspace init. If yes, let it do all
827 * the work
828 */
829
830 if (!ramdisk_execute_command)
831 ramdisk_execute_command = "/init";
832
833 if (sys_access((const char __user *) ramdisk_execute_command, 0) != 0) {
834 ramdisk_execute_command = NULL;
835 prepare_namespace();
836 }
837
838 /*
839 * Ok, we have completed the initial bootup, and
840 * we're essentially up and running. Get rid of the
841 * initmem segments and start the user-mode stuff..
842 */
843
844 init_post();
845 return 0;
846}
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/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);
90#ifndef CONFIG_DEBUG_RODATA
91static inline void mark_rodata_ro(void) { }
92#endif
93
94#ifdef CONFIG_TC
95extern void tc_init(void);
96#endif
97
98/*
99 * Debug helper: via this flag we know that we are in 'early bootup code'
100 * where only the boot processor is running with IRQ disabled. This means
101 * two things - IRQ must not be enabled before the flag is cleared and some
102 * operations which are not allowed with IRQ disabled are allowed while the
103 * flag is set.
104 */
105bool early_boot_irqs_disabled __read_mostly;
106
107enum system_states system_state __read_mostly;
108EXPORT_SYMBOL(system_state);
109
110/*
111 * Boot command-line arguments
112 */
113#define MAX_INIT_ARGS CONFIG_INIT_ENV_ARG_LIMIT
114#define MAX_INIT_ENVS CONFIG_INIT_ENV_ARG_LIMIT
115
116extern void time_init(void);
117/* Default late time init is NULL. archs can override this later. */
118void (*__initdata late_time_init)(void);
119extern void softirq_init(void);
120
121/* Untouched command line saved by arch-specific code. */
122char __initdata boot_command_line[COMMAND_LINE_SIZE];
123/* Untouched saved command line (eg. for /proc) */
124char *saved_command_line;
125/* Command line for parameter parsing */
126static char *static_command_line;
127
128static char *execute_command;
129static char *ramdisk_execute_command;
130
131/*
132 * If set, this is an indication to the drivers that reset the underlying
133 * device before going ahead with the initialization otherwise driver might
134 * rely on the BIOS and skip the reset operation.
135 *
136 * This is useful if kernel is booting in an unreliable environment.
137 * For ex. kdump situaiton where previous kernel has crashed, BIOS has been
138 * skipped and devices will be in unknown state.
139 */
140unsigned int reset_devices;
141EXPORT_SYMBOL(reset_devices);
142
143static int __init set_reset_devices(char *str)
144{
145 reset_devices = 1;
146 return 1;
147}
148
149__setup("reset_devices", set_reset_devices);
150
151static const char * argv_init[MAX_INIT_ARGS+2] = { "init", NULL, };
152const char * envp_init[MAX_INIT_ENVS+2] = { "HOME=/", "TERM=linux", NULL, };
153static const char *panic_later, *panic_param;
154
155extern const struct obs_kernel_param __setup_start[], __setup_end[];
156
157static int __init obsolete_checksetup(char *line)
158{
159 const struct obs_kernel_param *p;
160 int had_early_param = 0;
161
162 p = __setup_start;
163 do {
164 int n = strlen(p->str);
165 if (parameqn(line, p->str, n)) {
166 if (p->early) {
167 /* Already done in parse_early_param?
168 * (Needs exact match on param part).
169 * Keep iterating, as we can have early
170 * params and __setups of same names 8( */
171 if (line[n] == '\0' || line[n] == '=')
172 had_early_param = 1;
173 } else if (!p->setup_func) {
174 printk(KERN_WARNING "Parameter %s is obsolete,"
175 " ignored\n", p->str);
176 return 1;
177 } else if (p->setup_func(line + n))
178 return 1;
179 }
180 p++;
181 } while (p < __setup_end);
182
183 return had_early_param;
184}
185
186/*
187 * This should be approx 2 Bo*oMips to start (note initial shift), and will
188 * still work even if initially too large, it will just take slightly longer
189 */
190unsigned long loops_per_jiffy = (1<<12);
191
192EXPORT_SYMBOL(loops_per_jiffy);
193
194static int __init debug_kernel(char *str)
195{
196 console_loglevel = 10;
197 return 0;
198}
199
200static int __init quiet_kernel(char *str)
201{
202 console_loglevel = 4;
203 return 0;
204}
205
206early_param("debug", debug_kernel);
207early_param("quiet", quiet_kernel);
208
209static int __init loglevel(char *str)
210{
211 int newlevel;
212
213 /*
214 * Only update loglevel value when a correct setting was passed,
215 * to prevent blind crashes (when loglevel being set to 0) that
216 * are quite hard to debug
217 */
218 if (get_option(&str, &newlevel)) {
219 console_loglevel = newlevel;
220 return 0;
221 }
222
223 return -EINVAL;
224}
225
226early_param("loglevel", loglevel);
227
228/* Change NUL term back to "=", to make "param" the whole string. */
229static int __init repair_env_string(char *param, char *val, const char *unused)
230{
231 if (val) {
232 /* param=val or param="val"? */
233 if (val == param+strlen(param)+1)
234 val[-1] = '=';
235 else if (val == param+strlen(param)+2) {
236 val[-2] = '=';
237 memmove(val-1, val, strlen(val)+1);
238 val--;
239 } else
240 BUG();
241 }
242 return 0;
243}
244
245/*
246 * Unknown boot options get handed to init, unless they look like
247 * unused parameters (modprobe will find them in /proc/cmdline).
248 */
249static int __init unknown_bootoption(char *param, char *val, const char *unused)
250{
251 repair_env_string(param, val, unused);
252
253 /* Handle obsolete-style parameters */
254 if (obsolete_checksetup(param))
255 return 0;
256
257 /* Unused module parameter. */
258 if (strchr(param, '.') && (!val || strchr(param, '.') < val))
259 return 0;
260
261 if (panic_later)
262 return 0;
263
264 if (val) {
265 /* Environment option */
266 unsigned int i;
267 for (i = 0; envp_init[i]; i++) {
268 if (i == MAX_INIT_ENVS) {
269 panic_later = "Too many boot env vars at `%s'";
270 panic_param = param;
271 }
272 if (!strncmp(param, envp_init[i], val - param))
273 break;
274 }
275 envp_init[i] = param;
276 } else {
277 /* Command line option */
278 unsigned int i;
279 for (i = 0; argv_init[i]; i++) {
280 if (i == MAX_INIT_ARGS) {
281 panic_later = "Too many boot init vars at `%s'";
282 panic_param = param;
283 }
284 }
285 argv_init[i] = param;
286 }
287 return 0;
288}
289
290static int __init init_setup(char *str)
291{
292 unsigned int i;
293
294 execute_command = str;
295 /*
296 * In case LILO is going to boot us with default command line,
297 * it prepends "auto" before the whole cmdline which makes
298 * the shell think it should execute a script with such name.
299 * So we ignore all arguments entered _before_ init=... [MJ]
300 */
301 for (i = 1; i < MAX_INIT_ARGS; i++)
302 argv_init[i] = NULL;
303 return 1;
304}
305__setup("init=", init_setup);
306
307static int __init rdinit_setup(char *str)
308{
309 unsigned int i;
310
311 ramdisk_execute_command = str;
312 /* See "auto" comment in init_setup */
313 for (i = 1; i < MAX_INIT_ARGS; i++)
314 argv_init[i] = NULL;
315 return 1;
316}
317__setup("rdinit=", rdinit_setup);
318
319#ifndef CONFIG_SMP
320static const unsigned int setup_max_cpus = NR_CPUS;
321#ifdef CONFIG_X86_LOCAL_APIC
322static void __init smp_init(void)
323{
324 APIC_init_uniprocessor();
325}
326#else
327#define smp_init() do { } while (0)
328#endif
329
330static inline void setup_nr_cpu_ids(void) { }
331static inline void smp_prepare_cpus(unsigned int maxcpus) { }
332#endif
333
334/*
335 * We need to store the untouched command line for future reference.
336 * We also need to store the touched command line since the parameter
337 * parsing is performed in place, and we should allow a component to
338 * store reference of name/value for future reference.
339 */
340static void __init setup_command_line(char *command_line)
341{
342 saved_command_line = alloc_bootmem(strlen (boot_command_line)+1);
343 static_command_line = alloc_bootmem(strlen (command_line)+1);
344 strcpy (saved_command_line, boot_command_line);
345 strcpy (static_command_line, command_line);
346}
347
348/*
349 * We need to finalize in a non-__init function or else race conditions
350 * between the root thread and the init thread may cause start_kernel to
351 * be reaped by free_initmem before the root thread has proceeded to
352 * cpu_idle.
353 *
354 * gcc-3.4 accidentally inlines this function, so use noinline.
355 */
356
357static __initdata DECLARE_COMPLETION(kthreadd_done);
358
359static noinline void __init_refok rest_init(void)
360{
361 int pid;
362
363 rcu_scheduler_starting();
364 /*
365 * We need to spawn init first so that it obtains pid 1, however
366 * the init task will end up wanting to create kthreads, which, if
367 * we schedule it before we create kthreadd, will OOPS.
368 */
369 kernel_thread(kernel_init, NULL, CLONE_FS | CLONE_SIGHAND);
370 numa_default_policy();
371 pid = kernel_thread(kthreadd, NULL, CLONE_FS | CLONE_FILES);
372 rcu_read_lock();
373 kthreadd_task = find_task_by_pid_ns(pid, &init_pid_ns);
374 rcu_read_unlock();
375 complete(&kthreadd_done);
376
377 /*
378 * The boot idle thread must execute schedule()
379 * at least once to get things moving:
380 */
381 init_idle_bootup_task(current);
382 schedule_preempt_disabled();
383 /* Call into cpu_idle with preempt disabled */
384 cpu_idle();
385}
386
387/* Check for early params. */
388static int __init do_early_param(char *param, char *val, const char *unused)
389{
390 const struct obs_kernel_param *p;
391
392 for (p = __setup_start; p < __setup_end; p++) {
393 if ((p->early && parameq(param, p->str)) ||
394 (strcmp(param, "console") == 0 &&
395 strcmp(p->str, "earlycon") == 0)
396 ) {
397 if (p->setup_func(val) != 0)
398 printk(KERN_WARNING
399 "Malformed early option '%s'\n", param);
400 }
401 }
402 /* We accept everything at this stage. */
403 return 0;
404}
405
406void __init parse_early_options(char *cmdline)
407{
408 parse_args("early options", cmdline, NULL, 0, 0, 0, do_early_param);
409}
410
411/* Arch code calls this early on, or if not, just before other parsing. */
412void __init parse_early_param(void)
413{
414 static __initdata int done = 0;
415 static __initdata char tmp_cmdline[COMMAND_LINE_SIZE];
416
417 if (done)
418 return;
419
420 /* All fall through to do_early_param. */
421 strlcpy(tmp_cmdline, boot_command_line, COMMAND_LINE_SIZE);
422 parse_early_options(tmp_cmdline);
423 done = 1;
424}
425
426/*
427 * Activate the first processor.
428 */
429
430static void __init boot_cpu_init(void)
431{
432 int cpu = smp_processor_id();
433 /* Mark the boot cpu "present", "online" etc for SMP and UP case */
434 set_cpu_online(cpu, true);
435 set_cpu_active(cpu, true);
436 set_cpu_present(cpu, true);
437 set_cpu_possible(cpu, true);
438}
439
440void __init __weak smp_setup_processor_id(void)
441{
442}
443
444void __init __weak thread_info_cache_init(void)
445{
446}
447
448/*
449 * Set up kernel memory allocators
450 */
451static void __init mm_init(void)
452{
453 /*
454 * page_cgroup requires contiguous pages,
455 * bigger than MAX_ORDER unless SPARSEMEM.
456 */
457 page_cgroup_init_flatmem();
458 mem_init();
459 kmem_cache_init();
460 percpu_init_late();
461 pgtable_cache_init();
462 vmalloc_init();
463}
464
465asmlinkage void __init start_kernel(void)
466{
467 char * command_line;
468 extern const struct kernel_param __start___param[], __stop___param[];
469
470 /*
471 * Need to run as early as possible, to initialize the
472 * lockdep hash:
473 */
474 lockdep_init();
475 smp_setup_processor_id();
476 debug_objects_early_init();
477
478 /*
479 * Set up the the initial canary ASAP:
480 */
481 boot_init_stack_canary();
482
483 cgroup_init_early();
484
485 local_irq_disable();
486 early_boot_irqs_disabled = true;
487
488/*
489 * Interrupts are still disabled. Do necessary setups, then
490 * enable them
491 */
492 tick_init();
493 boot_cpu_init();
494 page_address_init();
495 printk(KERN_NOTICE "%s", linux_banner);
496 setup_arch(&command_line);
497 mm_init_owner(&init_mm, &init_task);
498 mm_init_cpumask(&init_mm);
499 setup_command_line(command_line);
500 setup_nr_cpu_ids();
501 setup_per_cpu_areas();
502 smp_prepare_boot_cpu(); /* arch-specific boot-cpu hooks */
503
504 build_all_zonelists(NULL);
505 page_alloc_init();
506
507 printk(KERN_NOTICE "Kernel command line: %s\n", boot_command_line);
508 parse_early_param();
509 parse_args("Booting kernel", static_command_line, __start___param,
510 __stop___param - __start___param,
511 -1, -1, &unknown_bootoption);
512
513 jump_label_init();
514
515 /*
516 * These use large bootmem allocations and must precede
517 * kmem_cache_init()
518 */
519 setup_log_buf(0);
520 pidhash_init();
521 vfs_caches_init_early();
522 sort_main_extable();
523 trap_init();
524 mm_init();
525
526 /*
527 * Set up the scheduler prior starting any interrupts (such as the
528 * timer interrupt). Full topology setup happens at smp_init()
529 * time - but meanwhile we still have a functioning scheduler.
530 */
531 sched_init();
532 /*
533 * Disable preemption - early bootup scheduling is extremely
534 * fragile until we cpu_idle() for the first time.
535 */
536 preempt_disable();
537 if (!irqs_disabled()) {
538 printk(KERN_WARNING "start_kernel(): bug: interrupts were "
539 "enabled *very* early, fixing it\n");
540 local_irq_disable();
541 }
542 idr_init_cache();
543 perf_event_init();
544 rcu_init();
545 radix_tree_init();
546 /* init some links before init_ISA_irqs() */
547 early_irq_init();
548 init_IRQ();
549 prio_tree_init();
550 init_timers();
551 hrtimers_init();
552 softirq_init();
553 timekeeping_init();
554 time_init();
555 profile_init();
556 call_function_init();
557 if (!irqs_disabled())
558 printk(KERN_CRIT "start_kernel(): bug: interrupts were "
559 "enabled early\n");
560 early_boot_irqs_disabled = false;
561 local_irq_enable();
562
563 kmem_cache_init_late();
564
565 /*
566 * HACK ALERT! This is early. We're enabling the console before
567 * we've done PCI setups etc, and console_init() must be aware of
568 * this. But we do want output early, in case something goes wrong.
569 */
570 console_init();
571 if (panic_later)
572 panic(panic_later, panic_param);
573
574 lockdep_info();
575
576 /*
577 * Need to run this when irqs are enabled, because it wants
578 * to self-test [hard/soft]-irqs on/off lock inversion bugs
579 * too:
580 */
581 locking_selftest();
582
583#ifdef CONFIG_BLK_DEV_INITRD
584 if (initrd_start && !initrd_below_start_ok &&
585 page_to_pfn(virt_to_page((void *)initrd_start)) < min_low_pfn) {
586 printk(KERN_CRIT "initrd overwritten (0x%08lx < 0x%08lx) - "
587 "disabling it.\n",
588 page_to_pfn(virt_to_page((void *)initrd_start)),
589 min_low_pfn);
590 initrd_start = 0;
591 }
592#endif
593 page_cgroup_init();
594 debug_objects_mem_init();
595 kmemleak_init();
596 setup_per_cpu_pageset();
597 numa_policy_init();
598 if (late_time_init)
599 late_time_init();
600 sched_clock_init();
601 calibrate_delay();
602 pidmap_init();
603 anon_vma_init();
604#ifdef CONFIG_X86
605 if (efi_enabled)
606 efi_enter_virtual_mode();
607#endif
608 thread_info_cache_init();
609 cred_init();
610 fork_init(totalram_pages);
611 proc_caches_init();
612 buffer_init();
613 key_init();
614 security_init();
615 dbg_late_init();
616 vfs_caches_init(totalram_pages);
617 signals_init();
618 /* rootfs populating might need page-writeback */
619 page_writeback_init();
620#ifdef CONFIG_PROC_FS
621 proc_root_init();
622#endif
623 cgroup_init();
624 cpuset_init();
625 taskstats_init_early();
626 delayacct_init();
627
628 check_bugs();
629
630 acpi_early_init(); /* before LAPIC and SMP init */
631 sfi_init_late();
632
633 ftrace_init();
634
635 /* Do the rest non-__init'ed, we're now alive */
636 rest_init();
637}
638
639/* Call all constructor functions linked into the kernel. */
640static void __init do_ctors(void)
641{
642#ifdef CONFIG_CONSTRUCTORS
643 ctor_fn_t *fn = (ctor_fn_t *) __ctors_start;
644
645 for (; fn < (ctor_fn_t *) __ctors_end; fn++)
646 (*fn)();
647#endif
648}
649
650bool initcall_debug;
651core_param(initcall_debug, initcall_debug, bool, 0644);
652
653static char msgbuf[64];
654
655static int __init_or_module do_one_initcall_debug(initcall_t fn)
656{
657 ktime_t calltime, delta, rettime;
658 unsigned long long duration;
659 int ret;
660
661 printk(KERN_DEBUG "calling %pF @ %i\n", fn, task_pid_nr(current));
662 calltime = ktime_get();
663 ret = fn();
664 rettime = ktime_get();
665 delta = ktime_sub(rettime, calltime);
666 duration = (unsigned long long) ktime_to_ns(delta) >> 10;
667 printk(KERN_DEBUG "initcall %pF returned %d after %lld usecs\n", fn,
668 ret, duration);
669
670 return ret;
671}
672
673int __init_or_module do_one_initcall(initcall_t fn)
674{
675 int count = preempt_count();
676 int ret;
677
678 if (initcall_debug)
679 ret = do_one_initcall_debug(fn);
680 else
681 ret = fn();
682
683 msgbuf[0] = 0;
684
685 if (ret && ret != -ENODEV && initcall_debug)
686 sprintf(msgbuf, "error code %d ", ret);
687
688 if (preempt_count() != count) {
689 strlcat(msgbuf, "preemption imbalance ", sizeof(msgbuf));
690 preempt_count() = count;
691 }
692 if (irqs_disabled()) {
693 strlcat(msgbuf, "disabled interrupts ", sizeof(msgbuf));
694 local_irq_enable();
695 }
696 if (msgbuf[0]) {
697 printk("initcall %pF returned with %s\n", fn, msgbuf);
698 }
699
700 return ret;
701}
702
703
704extern initcall_t __initcall_start[];
705extern initcall_t __initcall0_start[];
706extern initcall_t __initcall1_start[];
707extern initcall_t __initcall2_start[];
708extern initcall_t __initcall3_start[];
709extern initcall_t __initcall4_start[];
710extern initcall_t __initcall5_start[];
711extern initcall_t __initcall6_start[];
712extern initcall_t __initcall7_start[];
713extern initcall_t __initcall_end[];
714
715static initcall_t *initcall_levels[] __initdata = {
716 __initcall0_start,
717 __initcall1_start,
718 __initcall2_start,
719 __initcall3_start,
720 __initcall4_start,
721 __initcall5_start,
722 __initcall6_start,
723 __initcall7_start,
724 __initcall_end,
725};
726
727static char *initcall_level_names[] __initdata = {
728 "early",
729 "core",
730 "postcore",
731 "arch",
732 "subsys",
733 "fs",
734 "device",
735 "late",
736};
737
738static void __init do_initcall_level(int level)
739{
740 extern const struct kernel_param __start___param[], __stop___param[];
741 initcall_t *fn;
742
743 strcpy(static_command_line, saved_command_line);
744 parse_args(initcall_level_names[level],
745 static_command_line, __start___param,
746 __stop___param - __start___param,
747 level, level,
748 &repair_env_string);
749
750 for (fn = initcall_levels[level]; fn < initcall_levels[level+1]; fn++)
751 do_one_initcall(*fn);
752}
753
754static void __init do_initcalls(void)
755{
756 int level;
757
758 for (level = 0; level < ARRAY_SIZE(initcall_levels) - 1; level++)
759 do_initcall_level(level);
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 */
769static void __init do_basic_setup(void)
770{
771 cpuset_init_smp();
772 usermodehelper_init();
773 shmem_init();
774 driver_init();
775 init_irq_proc();
776 do_ctors();
777 usermodehelper_enable();
778 do_initcalls();
779}
780
781static void __init do_pre_smp_initcalls(void)
782{
783 initcall_t *fn;
784
785 for (fn = __initcall_start; fn < __initcall0_start; fn++)
786 do_one_initcall(*fn);
787}
788
789static void run_init_process(const char *init_filename)
790{
791 argv_init[0] = init_filename;
792 kernel_execve(init_filename, argv_init, envp_init);
793}
794
795/* This is a non __init function. Force it to be noinline otherwise gcc
796 * makes it inline to init() and it becomes part of init.text section
797 */
798static noinline int init_post(void)
799{
800 /* need to finish all async __init code before freeing the memory */
801 async_synchronize_full();
802 free_initmem();
803 mark_rodata_ro();
804 system_state = SYSTEM_RUNNING;
805 numa_default_policy();
806
807
808 current->signal->flags |= SIGNAL_UNKILLABLE;
809
810 if (ramdisk_execute_command) {
811 run_init_process(ramdisk_execute_command);
812 printk(KERN_WARNING "Failed to execute %s\n",
813 ramdisk_execute_command);
814 }
815
816 /*
817 * We try each of these until one succeeds.
818 *
819 * The Bourne shell can be used instead of init if we are
820 * trying to recover a really broken machine.
821 */
822 if (execute_command) {
823 run_init_process(execute_command);
824 printk(KERN_WARNING "Failed to execute %s. Attempting "
825 "defaults...\n", execute_command);
826 }
827 run_init_process("/sbin/init");
828 run_init_process("/etc/init");
829 run_init_process("/bin/init");
830 run_init_process("/bin/sh");
831
832 panic("No init found. Try passing init= option to kernel. "
833 "See Linux Documentation/init.txt for guidance.");
834}
835
836static int __init kernel_init(void * unused)
837{
838 /*
839 * Wait until kthreadd is all set-up.
840 */
841 wait_for_completion(&kthreadd_done);
842
843 /* Now the scheduler is fully set up and can do blocking allocations */
844 gfp_allowed_mask = __GFP_BITS_MASK;
845
846 /*
847 * init can allocate pages on any node
848 */
849 set_mems_allowed(node_states[N_HIGH_MEMORY]);
850 /*
851 * init can run on any cpu.
852 */
853 set_cpus_allowed_ptr(current, cpu_all_mask);
854
855 cad_pid = task_pid(current);
856
857 smp_prepare_cpus(setup_max_cpus);
858
859 do_pre_smp_initcalls();
860 lockup_detector_init();
861
862 smp_init();
863 sched_init_smp();
864
865 do_basic_setup();
866
867 /* Open the /dev/console on the rootfs, this should never fail */
868 if (sys_open((const char __user *) "/dev/console", O_RDWR, 0) < 0)
869 printk(KERN_WARNING "Warning: unable to open an initial console.\n");
870
871 (void) sys_dup(0);
872 (void) sys_dup(0);
873 /*
874 * check if there is an early userspace init. If yes, let it do all
875 * the work
876 */
877
878 if (!ramdisk_execute_command)
879 ramdisk_execute_command = "/init";
880
881 if (sys_access((const char __user *) ramdisk_execute_command, 0) != 0) {
882 ramdisk_execute_command = NULL;
883 prepare_namespace();
884 }
885
886 /*
887 * Ok, we have completed the initial bootup, and
888 * we're essentially up and running. Get rid of the
889 * initmem segments and start the user-mode stuff..
890 */
891
892 init_post();
893 return 0;
894}