Root/
Source at commit b13e7eb172b6f08e5fc22da162bdde5fcde201b5 created 11 years 11 months ago. By Maarten ter Huurne, fbcon: Add 6x10 font | |
---|---|
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 | /* |
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 | */ |
141 | unsigned int reset_devices; |
142 | EXPORT_SYMBOL(reset_devices); |
143 | |
144 | static 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 | |
152 | static const char * argv_init[MAX_INIT_ARGS+2] = { "init", NULL, }; |
153 | const char * envp_init[MAX_INIT_ENVS+2] = { "HOME=/", "TERM=linux", NULL, }; |
154 | static const char *panic_later, *panic_param; |
155 | |
156 | extern const struct obs_kernel_param __setup_start[], __setup_end[]; |
157 | |
158 | static int __init obsolete_checksetup(char *line) |
159 | { |
160 | const struct obs_kernel_param *p; |
161 | int had_early_param = 0; |
162 | |
163 | p = __setup_start; |
164 | do { |
165 | int n = strlen(p->str); |
166 | if (parameqn(line, p->str, n)) { |
167 | if (p->early) { |
168 | /* 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 | */ |
191 | unsigned long loops_per_jiffy = (1<<12); |
192 | |
193 | EXPORT_SYMBOL(loops_per_jiffy); |
194 | |
195 | static int __init debug_kernel(char *str) |
196 | { |
197 | console_loglevel = 10; |
198 | return 0; |
199 | } |
200 | |
201 | static int __init quiet_kernel(char *str) |
202 | { |
203 | console_loglevel = 4; |
204 | return 0; |
205 | } |
206 | |
207 | early_param("debug", debug_kernel); |
208 | early_param("quiet", quiet_kernel); |
209 | |
210 | static 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 | |
227 | early_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 | */ |
233 | static 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 | static int __init init_setup(char *str) |
286 | { |
287 | unsigned int i; |
288 | |
289 | execute_command = str; |
290 | /* |
291 | * In case LILO is going to boot us with default command line, |
292 | * it prepends "auto" before the whole cmdline which makes |
293 | * the shell think it should execute a script with such name. |
294 | * So we ignore all arguments entered _before_ init=... [MJ] |
295 | */ |
296 | for (i = 1; i < MAX_INIT_ARGS; i++) |
297 | argv_init[i] = NULL; |
298 | return 1; |
299 | } |
300 | __setup("init=", init_setup); |
301 | |
302 | static int __init rdinit_setup(char *str) |
303 | { |
304 | unsigned int i; |
305 | |
306 | ramdisk_execute_command = str; |
307 | /* See "auto" comment in init_setup */ |
308 | for (i = 1; i < MAX_INIT_ARGS; i++) |
309 | argv_init[i] = NULL; |
310 | return 1; |
311 | } |
312 | __setup("rdinit=", rdinit_setup); |
313 | |
314 | #ifndef CONFIG_SMP |
315 | static const unsigned int setup_max_cpus = NR_CPUS; |
316 | #ifdef CONFIG_X86_LOCAL_APIC |
317 | static void __init smp_init(void) |
318 | { |
319 | APIC_init_uniprocessor(); |
320 | } |
321 | #else |
322 | #define smp_init() do { } while (0) |
323 | #endif |
324 | |
325 | static inline void setup_nr_cpu_ids(void) { } |
326 | static inline void smp_prepare_cpus(unsigned int maxcpus) { } |
327 | #endif |
328 | |
329 | /* |
330 | * We need to store the untouched command line for future reference. |
331 | * We also need to store the touched command line since the parameter |
332 | * parsing is performed in place, and we should allow a component to |
333 | * store reference of name/value for future reference. |
334 | */ |
335 | static void __init setup_command_line(char *command_line) |
336 | { |
337 | saved_command_line = alloc_bootmem(strlen (boot_command_line)+1); |
338 | static_command_line = alloc_bootmem(strlen (command_line)+1); |
339 | strcpy (saved_command_line, boot_command_line); |
340 | strcpy (static_command_line, command_line); |
341 | } |
342 | |
343 | /* |
344 | * We need to finalize in a non-__init function or else race conditions |
345 | * between the root thread and the init thread may cause start_kernel to |
346 | * be reaped by free_initmem before the root thread has proceeded to |
347 | * cpu_idle. |
348 | * |
349 | * gcc-3.4 accidentally inlines this function, so use noinline. |
350 | */ |
351 | |
352 | static __initdata DECLARE_COMPLETION(kthreadd_done); |
353 | |
354 | static noinline void __init_refok rest_init(void) |
355 | { |
356 | int pid; |
357 | |
358 | rcu_scheduler_starting(); |
359 | /* |
360 | * We need to spawn init first so that it obtains pid 1, however |
361 | * the init task will end up wanting to create kthreads, which, if |
362 | * we schedule it before we create kthreadd, will OOPS. |
363 | */ |
364 | kernel_thread(kernel_init, NULL, CLONE_FS | CLONE_SIGHAND); |
365 | numa_default_policy(); |
366 | pid = kernel_thread(kthreadd, NULL, CLONE_FS | CLONE_FILES); |
367 | rcu_read_lock(); |
368 | kthreadd_task = find_task_by_pid_ns(pid, &init_pid_ns); |
369 | rcu_read_unlock(); |
370 | complete(&kthreadd_done); |
371 | |
372 | /* |
373 | * The boot idle thread must execute schedule() |
374 | * at least once to get things moving: |
375 | */ |
376 | init_idle_bootup_task(current); |
377 | preempt_enable_no_resched(); |
378 | schedule(); |
379 | |
380 | /* Call into cpu_idle with preempt disabled */ |
381 | preempt_disable(); |
382 | cpu_idle(); |
383 | } |
384 | |
385 | /* Check for early params. */ |
386 | static int __init do_early_param(char *param, char *val) |
387 | { |
388 | const struct obs_kernel_param *p; |
389 | |
390 | for (p = __setup_start; p < __setup_end; p++) { |
391 | if ((p->early && parameq(param, p->str)) || |
392 | (strcmp(param, "console") == 0 && |
393 | strcmp(p->str, "earlycon") == 0) |
394 | ) { |
395 | if (p->setup_func(val) != 0) |
396 | printk(KERN_WARNING |
397 | "Malformed early option '%s'\n", param); |
398 | } |
399 | } |
400 | /* We accept everything at this stage. */ |
401 | return 0; |
402 | } |
403 | |
404 | void __init parse_early_options(char *cmdline) |
405 | { |
406 | parse_args("early options", cmdline, NULL, 0, do_early_param); |
407 | } |
408 | |
409 | /* Arch code calls this early on, or if not, just before other parsing. */ |
410 | void __init parse_early_param(void) |
411 | { |
412 | static __initdata int done = 0; |
413 | static __initdata char tmp_cmdline[COMMAND_LINE_SIZE]; |
414 | |
415 | if (done) |
416 | return; |
417 | |
418 | /* All fall through to do_early_param. */ |
419 | strlcpy(tmp_cmdline, boot_command_line, COMMAND_LINE_SIZE); |
420 | parse_early_options(tmp_cmdline); |
421 | done = 1; |
422 | } |
423 | |
424 | /* |
425 | * Activate the first processor. |
426 | */ |
427 | |
428 | static void __init boot_cpu_init(void) |
429 | { |
430 | int cpu = smp_processor_id(); |
431 | /* Mark the boot cpu "present", "online" etc for SMP and UP case */ |
432 | set_cpu_online(cpu, true); |
433 | set_cpu_active(cpu, true); |
434 | set_cpu_present(cpu, true); |
435 | set_cpu_possible(cpu, true); |
436 | } |
437 | |
438 | void __init __weak smp_setup_processor_id(void) |
439 | { |
440 | } |
441 | |
442 | void __init __weak thread_info_cache_init(void) |
443 | { |
444 | } |
445 | |
446 | /* |
447 | * Set up kernel memory allocators |
448 | */ |
449 | static void __init mm_init(void) |
450 | { |
451 | /* |
452 | * page_cgroup requires countinous pages as memmap |
453 | * and it's bigger than MAX_ORDER unless SPARSEMEM. |
454 | */ |
455 | page_cgroup_init_flatmem(); |
456 | mem_init(); |
457 | kmem_cache_init(); |
458 | percpu_init_late(); |
459 | pgtable_cache_init(); |
460 | vmalloc_init(); |
461 | } |
462 | |
463 | asmlinkage void __init start_kernel(void) |
464 | { |
465 | char * command_line; |
466 | extern const struct kernel_param __start___param[], __stop___param[]; |
467 | |
468 | /* |
469 | * Need to run as early as possible, to initialize the |
470 | * lockdep hash: |
471 | */ |
472 | lockdep_init(); |
473 | smp_setup_processor_id(); |
474 | debug_objects_early_init(); |
475 | |
476 | /* |
477 | * Set up the the initial canary ASAP: |
478 | */ |
479 | boot_init_stack_canary(); |
480 | |
481 | cgroup_init_early(); |
482 | |
483 | local_irq_disable(); |
484 | early_boot_irqs_disabled = true; |
485 | |
486 | /* |
487 | * Interrupts are still disabled. Do necessary setups, then |
488 | * enable them |
489 | */ |
490 | tick_init(); |
491 | boot_cpu_init(); |
492 | page_address_init(); |
493 | printk(KERN_NOTICE "%s", linux_banner); |
494 | setup_arch(&command_line); |
495 | mm_init_owner(&init_mm, &init_task); |
496 | mm_init_cpumask(&init_mm); |
497 | setup_command_line(command_line); |
498 | setup_nr_cpu_ids(); |
499 | setup_per_cpu_areas(); |
500 | smp_prepare_boot_cpu(); /* arch-specific boot-cpu hooks */ |
501 | |
502 | build_all_zonelists(NULL); |
503 | page_alloc_init(); |
504 | |
505 | printk(KERN_NOTICE "Kernel command line: %s\n", boot_command_line); |
506 | parse_early_param(); |
507 | parse_args("Booting kernel", static_command_line, __start___param, |
508 | __stop___param - __start___param, |
509 | &unknown_bootoption); |
510 | |
511 | jump_label_init(); |
512 | |
513 | /* |
514 | * These use large bootmem allocations and must precede |
515 | * kmem_cache_init() |
516 | */ |
517 | setup_log_buf(0); |
518 | pidhash_init(); |
519 | vfs_caches_init_early(); |
520 | sort_main_extable(); |
521 | trap_init(); |
522 | mm_init(); |
523 | |
524 | /* |
525 | * Set up the scheduler prior starting any interrupts (such as the |
526 | * timer interrupt). Full topology setup happens at smp_init() |
527 | * time - but meanwhile we still have a functioning scheduler. |
528 | */ |
529 | sched_init(); |
530 | /* |
531 | * Disable preemption - early bootup scheduling is extremely |
532 | * fragile until we cpu_idle() for the first time. |
533 | */ |
534 | preempt_disable(); |
535 | if (!irqs_disabled()) { |
536 | printk(KERN_WARNING "start_kernel(): bug: interrupts were " |
537 | "enabled *very* early, fixing it\n"); |
538 | local_irq_disable(); |
539 | } |
540 | idr_init_cache(); |
541 | perf_event_init(); |
542 | rcu_init(); |
543 | radix_tree_init(); |
544 | /* init some links before init_ISA_irqs() */ |
545 | early_irq_init(); |
546 | init_IRQ(); |
547 | prio_tree_init(); |
548 | init_timers(); |
549 | hrtimers_init(); |
550 | softirq_init(); |
551 | timekeeping_init(); |
552 | time_init(); |
553 | profile_init(); |
554 | call_function_init(); |
555 | if (!irqs_disabled()) |
556 | printk(KERN_CRIT "start_kernel(): bug: interrupts were " |
557 | "enabled early\n"); |
558 | early_boot_irqs_disabled = false; |
559 | local_irq_enable(); |
560 | |
561 | /* Interrupts are enabled now so all GFP allocations are safe. */ |
562 | gfp_allowed_mask = __GFP_BITS_MASK; |
563 | |
564 | kmem_cache_init_late(); |
565 | |
566 | /* |
567 | * HACK ALERT! This is early. We're enabling the console before |
568 | * we've done PCI setups etc, and console_init() must be aware of |
569 | * this. But we do want output early, in case something goes wrong. |
570 | */ |
571 | console_init(); |
572 | if (panic_later) |
573 | panic(panic_later, panic_param); |
574 | |
575 | lockdep_info(); |
576 | |
577 | /* |
578 | * Need to run this when irqs are enabled, because it wants |
579 | * to self-test [hard/soft]-irqs on/off lock inversion bugs |
580 | * too: |
581 | */ |
582 | locking_selftest(); |
583 | |
584 | #ifdef CONFIG_BLK_DEV_INITRD |
585 | if (initrd_start && !initrd_below_start_ok && |
586 | page_to_pfn(virt_to_page((void *)initrd_start)) < min_low_pfn) { |
587 | printk(KERN_CRIT "initrd overwritten (0x%08lx < 0x%08lx) - " |
588 | "disabling it.\n", |
589 | page_to_pfn(virt_to_page((void *)initrd_start)), |
590 | min_low_pfn); |
591 | initrd_start = 0; |
592 | } |
593 | #endif |
594 | page_cgroup_init(); |
595 | debug_objects_mem_init(); |
596 | kmemleak_init(); |
597 | setup_per_cpu_pageset(); |
598 | numa_policy_init(); |
599 | if (late_time_init) |
600 | late_time_init(); |
601 | sched_clock_init(); |
602 | calibrate_delay(); |
603 | pidmap_init(); |
604 | anon_vma_init(); |
605 | #ifdef CONFIG_X86 |
606 | if (efi_enabled) |
607 | efi_enter_virtual_mode(); |
608 | #endif |
609 | thread_info_cache_init(); |
610 | cred_init(); |
611 | fork_init(totalram_pages); |
612 | proc_caches_init(); |
613 | buffer_init(); |
614 | key_init(); |
615 | security_init(); |
616 | dbg_late_init(); |
617 | vfs_caches_init(totalram_pages); |
618 | signals_init(); |
619 | /* rootfs populating might need page-writeback */ |
620 | page_writeback_init(); |
621 | #ifdef CONFIG_PROC_FS |
622 | proc_root_init(); |
623 | #endif |
624 | cgroup_init(); |
625 | cpuset_init(); |
626 | taskstats_init_early(); |
627 | delayacct_init(); |
628 | |
629 | check_bugs(); |
630 | |
631 | acpi_early_init(); /* before LAPIC and SMP init */ |
632 | sfi_init_late(); |
633 | |
634 | ftrace_init(); |
635 | |
636 | /* Do the rest non-__init'ed, we're now alive */ |
637 | rest_init(); |
638 | } |
639 | |
640 | /* Call all constructor functions linked into the kernel. */ |
641 | static void __init do_ctors(void) |
642 | { |
643 | #ifdef CONFIG_CONSTRUCTORS |
644 | ctor_fn_t *fn = (ctor_fn_t *) __ctors_start; |
645 | |
646 | for (; fn < (ctor_fn_t *) __ctors_end; fn++) |
647 | (*fn)(); |
648 | #endif |
649 | } |
650 | |
651 | bool initcall_debug; |
652 | core_param(initcall_debug, initcall_debug, bool, 0644); |
653 | |
654 | static char msgbuf[64]; |
655 | |
656 | static int __init_or_module do_one_initcall_debug(initcall_t fn) |
657 | { |
658 | ktime_t calltime, delta, rettime; |
659 | unsigned long long duration; |
660 | int ret; |
661 | |
662 | printk(KERN_DEBUG "calling %pF @ %i\n", fn, task_pid_nr(current)); |
663 | calltime = ktime_get(); |
664 | ret = fn(); |
665 | rettime = ktime_get(); |
666 | delta = ktime_sub(rettime, calltime); |
667 | duration = (unsigned long long) ktime_to_ns(delta) >> 10; |
668 | printk(KERN_DEBUG "initcall %pF returned %d after %lld usecs\n", fn, |
669 | ret, duration); |
670 | |
671 | return ret; |
672 | } |
673 | |
674 | int __init_or_module do_one_initcall(initcall_t fn) |
675 | { |
676 | int count = preempt_count(); |
677 | int ret; |
678 | |
679 | if (initcall_debug) |
680 | ret = do_one_initcall_debug(fn); |
681 | else |
682 | ret = fn(); |
683 | |
684 | msgbuf[0] = 0; |
685 | |
686 | if (ret && ret != -ENODEV && initcall_debug) |
687 | sprintf(msgbuf, "error code %d ", ret); |
688 | |
689 | if (preempt_count() != count) { |
690 | strlcat(msgbuf, "preemption imbalance ", sizeof(msgbuf)); |
691 | preempt_count() = count; |
692 | } |
693 | if (irqs_disabled()) { |
694 | strlcat(msgbuf, "disabled interrupts ", sizeof(msgbuf)); |
695 | local_irq_enable(); |
696 | } |
697 | if (msgbuf[0]) { |
698 | printk("initcall %pF returned with %s\n", fn, msgbuf); |
699 | } |
700 | |
701 | return ret; |
702 | } |
703 | |
704 | |
705 | extern initcall_t __initcall_start[], __initcall_end[], __early_initcall_end[]; |
706 | |
707 | static void __init do_initcalls(void) |
708 | { |
709 | initcall_t *fn; |
710 | |
711 | for (fn = __early_initcall_end; fn < __initcall_end; fn++) |
712 | do_one_initcall(*fn); |
713 | } |
714 | |
715 | /* |
716 | * Ok, the machine is now initialized. None of the devices |
717 | * have been touched yet, but the CPU subsystem is up and |
718 | * running, and memory and process management works. |
719 | * |
720 | * Now we can finally start doing some real work.. |
721 | */ |
722 | static void __init do_basic_setup(void) |
723 | { |
724 | cpuset_init_smp(); |
725 | usermodehelper_init(); |
726 | shmem_init(); |
727 | driver_init(); |
728 | init_irq_proc(); |
729 | do_ctors(); |
730 | usermodehelper_enable(); |
731 | do_initcalls(); |
732 | } |
733 | |
734 | static void __init do_pre_smp_initcalls(void) |
735 | { |
736 | initcall_t *fn; |
737 | |
738 | for (fn = __initcall_start; fn < __early_initcall_end; fn++) |
739 | do_one_initcall(*fn); |
740 | } |
741 | |
742 | static void run_init_process(const char *init_filename) |
743 | { |
744 | argv_init[0] = init_filename; |
745 | kernel_execve(init_filename, argv_init, envp_init); |
746 | } |
747 | |
748 | /* This is a non __init function. Force it to be noinline otherwise gcc |
749 | * makes it inline to init() and it becomes part of init.text section |
750 | */ |
751 | static noinline int init_post(void) |
752 | { |
753 | /* need to finish all async __init code before freeing the memory */ |
754 | async_synchronize_full(); |
755 | free_initmem(); |
756 | mark_rodata_ro(); |
757 | system_state = SYSTEM_RUNNING; |
758 | numa_default_policy(); |
759 | |
760 | |
761 | current->signal->flags |= SIGNAL_UNKILLABLE; |
762 | |
763 | if (ramdisk_execute_command) { |
764 | run_init_process(ramdisk_execute_command); |
765 | printk(KERN_WARNING "Failed to execute %s\n", |
766 | ramdisk_execute_command); |
767 | } |
768 | |
769 | /* |
770 | * We try each of these until one succeeds. |
771 | * |
772 | * The Bourne shell can be used instead of init if we are |
773 | * trying to recover a really broken machine. |
774 | */ |
775 | if (execute_command) { |
776 | run_init_process(execute_command); |
777 | printk(KERN_WARNING "Failed to execute %s. Attempting " |
778 | "defaults...\n", execute_command); |
779 | } |
780 | run_init_process("/sbin/init"); |
781 | run_init_process("/etc/init"); |
782 | run_init_process("/bin/init"); |
783 | run_init_process("/bin/sh"); |
784 | |
785 | panic("No init found. Try passing init= option to kernel. " |
786 | "See Linux Documentation/init.txt for guidance."); |
787 | } |
788 | |
789 | static int __init kernel_init(void * unused) |
790 | { |
791 | /* |
792 | * Wait until kthreadd is all set-up. |
793 | */ |
794 | wait_for_completion(&kthreadd_done); |
795 | /* |
796 | * init can allocate pages on any node |
797 | */ |
798 | set_mems_allowed(node_states[N_HIGH_MEMORY]); |
799 | /* |
800 | * init can run on any cpu. |
801 | */ |
802 | set_cpus_allowed_ptr(current, cpu_all_mask); |
803 | |
804 | cad_pid = task_pid(current); |
805 | |
806 | smp_prepare_cpus(setup_max_cpus); |
807 | |
808 | do_pre_smp_initcalls(); |
809 | lockup_detector_init(); |
810 | |
811 | smp_init(); |
812 | sched_init_smp(); |
813 | |
814 | do_basic_setup(); |
815 | |
816 | /* Open the /dev/console on the rootfs, this should never fail */ |
817 | if (sys_open((const char __user *) "/dev/console", O_RDWR, 0) < 0) |
818 | printk(KERN_WARNING "Warning: unable to open an initial console.\n"); |
819 | |
820 | (void) sys_dup(0); |
821 | (void) sys_dup(0); |
822 | /* |
823 | * check if there is an early userspace init. If yes, let it do all |
824 | * the work |
825 | */ |
826 | |
827 | if (!ramdisk_execute_command) |
828 | ramdisk_execute_command = "/init"; |
829 | |
830 | if (sys_access((const char __user *) ramdisk_execute_command, 0) != 0) { |
831 | ramdisk_execute_command = NULL; |
832 | prepare_namespace(); |
833 | } |
834 | |
835 | /* |
836 | * Ok, we have completed the initial bootup, and |
837 | * we're essentially up and running. Get rid of the |
838 | * initmem segments and start the user-mode stuff.. |
839 | */ |
840 | |
841 | init_post(); |
842 | return 0; |
843 | } |
844 |
Branches:
ben-wpan
ben-wpan-stefan
javiroman/ks7010
jz-2.6.34
jz-2.6.34-rc5
jz-2.6.34-rc6
jz-2.6.34-rc7
jz-2.6.35
jz-2.6.36
jz-2.6.37
jz-2.6.38
jz-2.6.39
jz-3.0
jz-3.1
jz-3.11
jz-3.12
jz-3.13
jz-3.15
jz-3.16
jz-3.18-dt
jz-3.2
jz-3.3
jz-3.4
jz-3.5
jz-3.6
jz-3.6-rc2-pwm
jz-3.9
jz-3.9-clk
jz-3.9-rc8
jz47xx
jz47xx-2.6.38
master
Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9