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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 | |
82 | static int kernel_init(void *); |
83 | |
84 | extern void init_IRQ(void); |
85 | extern void fork_init(unsigned long); |
86 | extern void mca_init(void); |
87 | extern void sbus_init(void); |
88 | extern void prio_tree_init(void); |
89 | extern void radix_tree_init(void); |
90 | extern void free_initmem(void); |
91 | #ifndef CONFIG_DEBUG_RODATA |
92 | static inline void mark_rodata_ro(void) { } |
93 | #endif |
94 | |
95 | #ifdef CONFIG_TC |
96 | extern 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 | */ |
106 | bool early_boot_irqs_disabled __read_mostly; |
107 | |
108 | enum system_states system_state __read_mostly; |
109 | EXPORT_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 | |
117 | extern void time_init(void); |
118 | /* Default late time init is NULL. archs can override this later. */ |
119 | void (*__initdata late_time_init)(void); |
120 | extern void softirq_init(void); |
121 | |
122 | /* Untouched command line saved by arch-specific code. */ |
123 | char __initdata boot_command_line[COMMAND_LINE_SIZE]; |
124 | /* Untouched saved command line (eg. for /proc) */ |
125 | char *saved_command_line; |
126 | /* Command line for parameter parsing */ |
127 | static char *static_command_line; |
128 | |
129 | static char *execute_command; |
130 | static char *ramdisk_execute_command; |
131 | |
132 | #ifdef CONFIG_SMP |
133 | /* Setup configured maximum number of CPUs to activate */ |
134 | unsigned int setup_max_cpus = NR_CPUS; |
135 | EXPORT_SYMBOL(setup_max_cpus); |
136 | |
137 | |
138 | /* |
139 | * Setup routine for controlling SMP activation |
140 | * |
141 | * Command-line option of "nosmp" or "maxcpus=0" will disable SMP |
142 | * activation entirely (the MPS table probe still happens, though). |
143 | * |
144 | * Command-line option of "maxcpus=<NUM>", where <NUM> is an integer |
145 | * greater than 0, limits the maximum number of CPUs activated in |
146 | * SMP mode to <NUM>. |
147 | */ |
148 | |
149 | void __weak arch_disable_smp_support(void) { } |
150 | |
151 | static int __init nosmp(char *str) |
152 | { |
153 | setup_max_cpus = 0; |
154 | arch_disable_smp_support(); |
155 | |
156 | return 0; |
157 | } |
158 | |
159 | early_param("nosmp", nosmp); |
160 | |
161 | /* this is hard limit */ |
162 | static 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 | |
173 | early_param("nr_cpus", nrcpus); |
174 | |
175 | static 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 | |
184 | early_param("maxcpus", maxcpus); |
185 | #else |
186 | static const unsigned int setup_max_cpus = NR_CPUS; |
187 | #endif |
188 | |
189 | /* |
190 | * If set, this is an indication to the drivers that reset the underlying |
191 | * device before going ahead with the initialization otherwise driver might |
192 | * rely on the BIOS and skip the reset operation. |
193 | * |
194 | * This is useful if kernel is booting in an unreliable environment. |
195 | * For ex. kdump situaiton where previous kernel has crashed, BIOS has been |
196 | * skipped and devices will be in unknown state. |
197 | */ |
198 | unsigned int reset_devices; |
199 | EXPORT_SYMBOL(reset_devices); |
200 | |
201 | static 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 | |
209 | static const char * argv_init[MAX_INIT_ARGS+2] = { "init", NULL, }; |
210 | const char * envp_init[MAX_INIT_ENVS+2] = { "HOME=/", "TERM=linux", NULL, }; |
211 | static const char *panic_later, *panic_param; |
212 | |
213 | extern const struct obs_kernel_param __setup_start[], __setup_end[]; |
214 | |
215 | static 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 | /* Already done in parse_early_param? |
226 | * (Needs exact match on param part). |
227 | * Keep iterating, as we can have early |
228 | * params and __setups of same names 8( */ |
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 | * This should be approx 2 Bo*oMips to start (note initial shift), and will |
246 | * still work even if initially too large, it will just take slightly longer |
247 | */ |
248 | unsigned long loops_per_jiffy = (1<<12); |
249 | |
250 | EXPORT_SYMBOL(loops_per_jiffy); |
251 | |
252 | static int __init debug_kernel(char *str) |
253 | { |
254 | console_loglevel = 10; |
255 | return 0; |
256 | } |
257 | |
258 | static int __init quiet_kernel(char *str) |
259 | { |
260 | console_loglevel = 4; |
261 | return 0; |
262 | } |
263 | |
264 | early_param("debug", debug_kernel); |
265 | early_param("quiet", quiet_kernel); |
266 | |
267 | static int __init loglevel(char *str) |
268 | { |
269 | get_option(&str, &console_loglevel); |
270 | return 0; |
271 | } |
272 | |
273 | early_param("loglevel", loglevel); |
274 | |
275 | /* |
276 | * Unknown boot options get handed to init, unless they look like |
277 | * unused parameters (modprobe will find them in /proc/cmdline). |
278 | */ |
279 | static int __init unknown_bootoption(char *param, char *val) |
280 | { |
281 | /* Change NUL term back to "=", to make "param" the whole string. */ |
282 | if (val) { |
283 | /* param=val or param="val"? */ |
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 | /* Handle obsolete-style parameters */ |
295 | if (obsolete_checksetup(param)) |
296 | return 0; |
297 | |
298 | /* Unused module parameter. */ |
299 | if (strchr(param, '.') && (!val || strchr(param, '.') < val)) |
300 | return 0; |
301 | |
302 | if (panic_later) |
303 | return 0; |
304 | |
305 | if (val) { |
306 | /* Environment option */ |
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 | /* Command line option */ |
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 |
332 | int __read_mostly debug_pagealloc_enabled = 0; |
333 | #endif |
334 | |
335 | static int __init init_setup(char *str) |
336 | { |
337 | unsigned int i; |
338 | |
339 | execute_command = str; |
340 | /* |
341 | * In case LILO is going to boot us with default command line, |
342 | * it prepends "auto" before the whole cmdline which makes |
343 | * the shell think it should execute a script with such name. |
344 | * So we ignore all arguments entered _before_ init=... [MJ] |
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 | |
352 | static int __init rdinit_setup(char *str) |
353 | { |
354 | unsigned int i; |
355 | |
356 | ramdisk_execute_command = str; |
357 | /* See "auto" comment in init_setup */ |
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 |
367 | static void __init smp_init(void) |
368 | { |
369 | APIC_init_uniprocessor(); |
370 | } |
371 | #else |
372 | #define smp_init() do { } while (0) |
373 | #endif |
374 | |
375 | static inline void setup_nr_cpu_ids(void) { } |
376 | static inline void smp_prepare_cpus(unsigned int maxcpus) { } |
377 | |
378 | #else |
379 | |
380 | /* Setup number of possible processor ids */ |
381 | int nr_cpu_ids __read_mostly = NR_CPUS; |
382 | EXPORT_SYMBOL(nr_cpu_ids); |
383 | |
384 | /* An arch may set nr_cpu_ids earlier if needed, so this would be redundant */ |
385 | static 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 | /* Called by boot processor to activate the rest. */ |
391 | static void __init smp_init(void) |
392 | { |
393 | unsigned int cpu; |
394 | |
395 | /* FIXME: This should be done in userspace --RR */ |
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 | /* Any cleanup work */ |
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 | * We need to store the untouched command line for future reference. |
412 | * We also need to store the touched command line since the parameter |
413 | * parsing is performed in place, and we should allow a component to |
414 | * store reference of name/value for future reference. |
415 | */ |
416 | static 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 | * We need to finalize in a non-__init function or else race conditions |
426 | * between the root thread and the init thread may cause start_kernel to |
427 | * be reaped by free_initmem before the root thread has proceeded to |
428 | * cpu_idle. |
429 | * |
430 | * gcc-3.4 accidentally inlines this function, so use noinline. |
431 | */ |
432 | |
433 | static __initdata DECLARE_COMPLETION(kthreadd_done); |
434 | |
435 | static noinline void __init_refok rest_init(void) |
436 | { |
437 | int pid; |
438 | |
439 | rcu_scheduler_starting(); |
440 | /* |
441 | * We need to spawn init first so that it obtains pid 1, however |
442 | * the init task will end up wanting to create kthreads, which, if |
443 | * we schedule it before we create kthreadd, will OOPS. |
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 | * The boot idle thread must execute schedule() |
455 | * at least once to get things moving: |
456 | */ |
457 | init_idle_bootup_task(current); |
458 | preempt_enable_no_resched(); |
459 | schedule(); |
460 | preempt_disable(); |
461 | |
462 | /* Call into cpu_idle with preempt disabled */ |
463 | cpu_idle(); |
464 | } |
465 | |
466 | /* Check for early params. */ |
467 | static 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 | /* We accept everything at this stage. */ |
482 | return 0; |
483 | } |
484 | |
485 | void __init parse_early_options(char *cmdline) |
486 | { |
487 | parse_args("early options", cmdline, NULL, 0, do_early_param); |
488 | } |
489 | |
490 | /* Arch code calls this early on, or if not, just before other parsing. */ |
491 | void __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 | /* All fall through to do_early_param. */ |
500 | strlcpy(tmp_cmdline, boot_command_line, COMMAND_LINE_SIZE); |
501 | parse_early_options(tmp_cmdline); |
502 | done = 1; |
503 | } |
504 | |
505 | /* |
506 | * Activate the first processor. |
507 | */ |
508 | |
509 | static void __init boot_cpu_init(void) |
510 | { |
511 | int cpu = smp_processor_id(); |
512 | /* Mark the boot cpu "present", "online" etc for SMP and UP case */ |
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 | |
519 | void __init __weak smp_setup_processor_id(void) |
520 | { |
521 | } |
522 | |
523 | void __init __weak thread_info_cache_init(void) |
524 | { |
525 | } |
526 | |
527 | /* |
528 | * Set up kernel memory allocators |
529 | */ |
530 | static void __init mm_init(void) |
531 | { |
532 | /* |
533 | * page_cgroup requires countinous pages as memmap |
534 | * and it's bigger than MAX_ORDER unless SPARSEMEM. |
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 | |
544 | asmlinkage 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 | * Need to run as early as possible, to initialize the |
553 | * lockdep hash: |
554 | */ |
555 | lockdep_init(); |
556 | debug_objects_early_init(); |
557 | |
558 | /* |
559 | * Set up the the initial canary ASAP: |
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 | * Interrupts are still disabled. Do necessary setups, then |
570 | * enable them |
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(); /* arch-specific boot-cpu hooks */ |
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 | * These use large bootmem allocations and must precede |
593 | * kmem_cache_init() |
594 | */ |
595 | pidhash_init(); |
596 | vfs_caches_init_early(); |
597 | sort_main_extable(); |
598 | trap_init(); |
599 | mm_init(); |
600 | /* |
601 | * Set up the scheduler prior starting any interrupts (such as the |
602 | * timer interrupt). Full topology setup happens at smp_init() |
603 | * time - but meanwhile we still have a functioning scheduler. |
604 | */ |
605 | sched_init(); |
606 | /* |
607 | * Disable preemption - early bootup scheduling is extremely |
608 | * fragile until we cpu_idle() for the first time. |
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 | /* init some links before init_ISA_irqs() */ |
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 | /* Interrupts are enabled now so all GFP allocations are safe. */ |
637 | gfp_allowed_mask = __GFP_BITS_MASK; |
638 | |
639 | kmem_cache_init_late(); |
640 | |
641 | /* |
642 | * HACK ALERT! This is early. We're enabling the console before |
643 | * we've done PCI setups etc, and console_init() must be aware of |
644 | * this. But we do want output early, in case something goes wrong. |
645 | */ |
646 | console_init(); |
647 | if (panic_later) |
648 | panic(panic_later, panic_param); |
649 | |
650 | lockdep_info(); |
651 | |
652 | /* |
653 | * Need to run this when irqs are enabled, because it wants |
654 | * to self-test [hard/soft]-irqs on/off lock inversion bugs |
655 | * too: |
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 | /* rootfs populating might need page-writeback */ |
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(); /* before LAPIC and SMP init */ |
708 | sfi_init_late(); |
709 | |
710 | ftrace_init(); |
711 | |
712 | /* Do the rest non-__init'ed, we're now alive */ |
713 | rest_init(); |
714 | } |
715 | |
716 | /* Call all constructor functions linked into the kernel. */ |
717 | static 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 | |
727 | int initcall_debug; |
728 | core_param(initcall_debug, initcall_debug, bool, 0644); |
729 | |
730 | static char msgbuf[64]; |
731 | |
732 | static 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 | |
750 | int __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 | |
781 | extern initcall_t __initcall_start[], __initcall_end[], __early_initcall_end[]; |
782 | |
783 | static 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 | * Ok, the machine is now initialized. None of the devices |
793 | * have been touched yet, but the CPU subsystem is up and |
794 | * running, and memory and process management works. |
795 | * |
796 | * Now we can finally start doing some real work.. |
797 | */ |
798 | static 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 | |
809 | static 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 | |
817 | static 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 | /* This is a non __init function. Force it to be noinline otherwise gcc |
824 | * makes it inline to init() and it becomes part of init.text section |
825 | */ |
826 | static noinline int init_post(void) |
827 | { |
828 | /* need to finish all async __init code before freeing the memory */ |
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 | * We try each of these until one succeeds. |
846 | * |
847 | * The Bourne shell can be used instead of init if we are |
848 | * trying to recover a really broken machine. |
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("/etc/preinit"); |
856 | run_init_process("/sbin/init"); |
857 | run_init_process("/etc/init"); |
858 | run_init_process("/bin/init"); |
859 | run_init_process("/bin/sh"); |
860 | |
861 | panic("No init found. Try passing init= option to kernel. " |
862 | "See Linux Documentation/init.txt for guidance."); |
863 | } |
864 | |
865 | static int __init kernel_init(void * unused) |
866 | { |
867 | /* |
868 | * Wait until kthreadd is all set-up. |
869 | */ |
870 | wait_for_completion(&kthreadd_done); |
871 | /* |
872 | * init can allocate pages on any node |
873 | */ |
874 | set_mems_allowed(node_states[N_HIGH_MEMORY]); |
875 | /* |
876 | * init can run on any cpu. |
877 | */ |
878 | set_cpus_allowed_ptr(current, cpu_all_mask); |
879 | /* |
880 | * Tell the world that we're going to be the grim |
881 | * reaper of innocent orphaned children. |
882 | * |
883 | * We don't want people to have to make incorrect |
884 | * assumptions about where in the task array this |
885 | * can be found. |
886 | */ |
887 | init_pid_ns.child_reaper = current; |
888 | |
889 | cad_pid = task_pid(current); |
890 | |
891 | smp_prepare_cpus(setup_max_cpus); |
892 | |
893 | do_pre_smp_initcalls(); |
894 | lockup_detector_init(); |
895 | |
896 | smp_init(); |
897 | sched_init_smp(); |
898 | |
899 | do_basic_setup(); |
900 | |
901 | /* Open the /dev/console on the rootfs, this should never fail */ |
902 | if (sys_open((const char __user *) "/dev/console", O_RDWR, 0) < 0) |
903 | printk(KERN_WARNING "Warning: unable to open an initial console.\n"); |
904 | |
905 | (void) sys_dup(0); |
906 | (void) sys_dup(0); |
907 | /* |
908 | * check if there is an early userspace init. If yes, let it do all |
909 | * the work |
910 | */ |
911 | |
912 | if (!ramdisk_execute_command) |
913 | ramdisk_execute_command = "/init"; |
914 | |
915 | if (sys_access((const char __user *) ramdisk_execute_command, 0) != 0) { |
916 | ramdisk_execute_command = NULL; |
917 | prepare_namespace(); |
918 | } |
919 | |
920 | /* |
921 | * Ok, we have completed the initial bootup, and |
922 | * we're essentially up and running. Get rid of the |
923 | * initmem segments and start the user-mode stuff.. |
924 | */ |
925 | |
926 | init_post(); |
927 | return 0; |
928 | } |
929 |
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javiroman/ks7010
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9