Root/
Source at commit ec7cab4cbb721bff91ec924ec691efd8daf36579 created 12 years 8 months ago. By Maarten ter Huurne, MIPS: JZ4740: A320: Updated quickstart documentation. | |
---|---|
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 (!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 | */ |
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 | get_option(&str, &console_loglevel); |
213 | return 0; |
214 | } |
215 | |
216 | early_param("loglevel", loglevel); |
217 | |
218 | /* |
219 | * Unknown boot options get handed to init, unless they look like |
220 | * unused parameters (modprobe will find them in /proc/cmdline). |
221 | */ |
222 | static int __init unknown_bootoption(char *param, char *val) |
223 | { |
224 | /* Change NUL term back to "=", to make "param" the whole string. */ |
225 | if (val) { |
226 | /* param=val or param="val"? */ |
227 | if (val == param+strlen(param)+1) |
228 | val[-1] = '='; |
229 | else if (val == param+strlen(param)+2) { |
230 | val[-2] = '='; |
231 | memmove(val-1, val, strlen(val)+1); |
232 | val--; |
233 | } else |
234 | BUG(); |
235 | } |
236 | |
237 | /* Handle obsolete-style parameters */ |
238 | if (obsolete_checksetup(param)) |
239 | return 0; |
240 | |
241 | /* Unused module parameter. */ |
242 | if (strchr(param, '.') && (!val || strchr(param, '.') < val)) |
243 | return 0; |
244 | |
245 | if (panic_later) |
246 | return 0; |
247 | |
248 | if (val) { |
249 | /* Environment option */ |
250 | unsigned int i; |
251 | for (i = 0; envp_init[i]; i++) { |
252 | if (i == MAX_INIT_ENVS) { |
253 | panic_later = "Too many boot env vars at `%s'"; |
254 | panic_param = param; |
255 | } |
256 | if (!strncmp(param, envp_init[i], val - param)) |
257 | break; |
258 | } |
259 | envp_init[i] = param; |
260 | } else { |
261 | /* Command line option */ |
262 | unsigned int i; |
263 | for (i = 0; argv_init[i]; i++) { |
264 | if (i == MAX_INIT_ARGS) { |
265 | panic_later = "Too many boot init vars at `%s'"; |
266 | panic_param = param; |
267 | } |
268 | } |
269 | argv_init[i] = param; |
270 | } |
271 | return 0; |
272 | } |
273 | |
274 | #ifdef CONFIG_DEBUG_PAGEALLOC |
275 | int __read_mostly debug_pagealloc_enabled = 0; |
276 | #endif |
277 | |
278 | static int __init init_setup(char *str) |
279 | { |
280 | unsigned int i; |
281 | |
282 | execute_command = str; |
283 | /* |
284 | * In case LILO is going to boot us with default command line, |
285 | * it prepends "auto" before the whole cmdline which makes |
286 | * the shell think it should execute a script with such name. |
287 | * So we ignore all arguments entered _before_ init=... [MJ] |
288 | */ |
289 | for (i = 1; i < MAX_INIT_ARGS; i++) |
290 | argv_init[i] = NULL; |
291 | return 1; |
292 | } |
293 | __setup("init=", init_setup); |
294 | |
295 | static int __init rdinit_setup(char *str) |
296 | { |
297 | unsigned int i; |
298 | |
299 | ramdisk_execute_command = str; |
300 | /* See "auto" comment in init_setup */ |
301 | for (i = 1; i < MAX_INIT_ARGS; i++) |
302 | argv_init[i] = NULL; |
303 | return 1; |
304 | } |
305 | __setup("rdinit=", rdinit_setup); |
306 | |
307 | #ifndef CONFIG_SMP |
308 | static const unsigned int setup_max_cpus = NR_CPUS; |
309 | #ifdef CONFIG_X86_LOCAL_APIC |
310 | static void __init smp_init(void) |
311 | { |
312 | APIC_init_uniprocessor(); |
313 | } |
314 | #else |
315 | #define smp_init() do { } while (0) |
316 | #endif |
317 | |
318 | static inline void setup_nr_cpu_ids(void) { } |
319 | static inline void smp_prepare_cpus(unsigned int maxcpus) { } |
320 | #endif |
321 | |
322 | /* |
323 | * We need to store the untouched command line for future reference. |
324 | * We also need to store the touched command line since the parameter |
325 | * parsing is performed in place, and we should allow a component to |
326 | * store reference of name/value for future reference. |
327 | */ |
328 | static void __init setup_command_line(char *command_line) |
329 | { |
330 | saved_command_line = alloc_bootmem(strlen (boot_command_line)+1); |
331 | static_command_line = alloc_bootmem(strlen (command_line)+1); |
332 | strcpy (saved_command_line, boot_command_line); |
333 | strcpy (static_command_line, command_line); |
334 | } |
335 | |
336 | /* |
337 | * We need to finalize in a non-__init function or else race conditions |
338 | * between the root thread and the init thread may cause start_kernel to |
339 | * be reaped by free_initmem before the root thread has proceeded to |
340 | * cpu_idle. |
341 | * |
342 | * gcc-3.4 accidentally inlines this function, so use noinline. |
343 | */ |
344 | |
345 | static __initdata DECLARE_COMPLETION(kthreadd_done); |
346 | |
347 | static noinline void __init_refok rest_init(void) |
348 | { |
349 | int pid; |
350 | |
351 | rcu_scheduler_starting(); |
352 | /* |
353 | * We need to spawn init first so that it obtains pid 1, however |
354 | * the init task will end up wanting to create kthreads, which, if |
355 | * we schedule it before we create kthreadd, will OOPS. |
356 | */ |
357 | kernel_thread(kernel_init, NULL, CLONE_FS | CLONE_SIGHAND); |
358 | numa_default_policy(); |
359 | pid = kernel_thread(kthreadd, NULL, CLONE_FS | CLONE_FILES); |
360 | rcu_read_lock(); |
361 | kthreadd_task = find_task_by_pid_ns(pid, &init_pid_ns); |
362 | rcu_read_unlock(); |
363 | complete(&kthreadd_done); |
364 | |
365 | /* |
366 | * The boot idle thread must execute schedule() |
367 | * at least once to get things moving: |
368 | */ |
369 | init_idle_bootup_task(current); |
370 | preempt_enable_no_resched(); |
371 | schedule(); |
372 | preempt_disable(); |
373 | |
374 | /* Call into cpu_idle with preempt disabled */ |
375 | cpu_idle(); |
376 | } |
377 | |
378 | /* Check for early params. */ |
379 | static int __init do_early_param(char *param, char *val) |
380 | { |
381 | const struct obs_kernel_param *p; |
382 | |
383 | for (p = __setup_start; p < __setup_end; p++) { |
384 | if ((p->early && strcmp(param, p->str) == 0) || |
385 | (strcmp(param, "console") == 0 && |
386 | strcmp(p->str, "earlycon") == 0) |
387 | ) { |
388 | if (p->setup_func(val) != 0) |
389 | printk(KERN_WARNING |
390 | "Malformed early option '%s'\n", param); |
391 | } |
392 | } |
393 | /* We accept everything at this stage. */ |
394 | return 0; |
395 | } |
396 | |
397 | void __init parse_early_options(char *cmdline) |
398 | { |
399 | parse_args("early options", cmdline, NULL, 0, do_early_param); |
400 | } |
401 | |
402 | /* Arch code calls this early on, or if not, just before other parsing. */ |
403 | void __init parse_early_param(void) |
404 | { |
405 | static __initdata int done = 0; |
406 | static __initdata char tmp_cmdline[COMMAND_LINE_SIZE]; |
407 | |
408 | if (done) |
409 | return; |
410 | |
411 | /* All fall through to do_early_param. */ |
412 | strlcpy(tmp_cmdline, boot_command_line, COMMAND_LINE_SIZE); |
413 | parse_early_options(tmp_cmdline); |
414 | done = 1; |
415 | } |
416 | |
417 | /* |
418 | * Activate the first processor. |
419 | */ |
420 | |
421 | static void __init boot_cpu_init(void) |
422 | { |
423 | int cpu = smp_processor_id(); |
424 | /* Mark the boot cpu "present", "online" etc for SMP and UP case */ |
425 | set_cpu_online(cpu, true); |
426 | set_cpu_active(cpu, true); |
427 | set_cpu_present(cpu, true); |
428 | set_cpu_possible(cpu, true); |
429 | } |
430 | |
431 | void __init __weak smp_setup_processor_id(void) |
432 | { |
433 | } |
434 | |
435 | void __init __weak thread_info_cache_init(void) |
436 | { |
437 | } |
438 | |
439 | /* |
440 | * Set up kernel memory allocators |
441 | */ |
442 | static void __init mm_init(void) |
443 | { |
444 | /* |
445 | * page_cgroup requires countinous pages as memmap |
446 | * and it's bigger than MAX_ORDER unless SPARSEMEM. |
447 | */ |
448 | page_cgroup_init_flatmem(); |
449 | mem_init(); |
450 | kmem_cache_init(); |
451 | percpu_init_late(); |
452 | pgtable_cache_init(); |
453 | vmalloc_init(); |
454 | } |
455 | |
456 | asmlinkage void __init start_kernel(void) |
457 | { |
458 | char * command_line; |
459 | extern const struct kernel_param __start___param[], __stop___param[]; |
460 | |
461 | smp_setup_processor_id(); |
462 | |
463 | /* |
464 | * Need to run as early as possible, to initialize the |
465 | * lockdep hash: |
466 | */ |
467 | lockdep_init(); |
468 | debug_objects_early_init(); |
469 | |
470 | /* |
471 | * Set up the the initial canary ASAP: |
472 | */ |
473 | boot_init_stack_canary(); |
474 | |
475 | cgroup_init_early(); |
476 | |
477 | local_irq_disable(); |
478 | early_boot_irqs_disabled = true; |
479 | |
480 | /* |
481 | * Interrupts are still disabled. Do necessary setups, then |
482 | * enable them |
483 | */ |
484 | tick_init(); |
485 | boot_cpu_init(); |
486 | page_address_init(); |
487 | printk(KERN_NOTICE "%s", linux_banner); |
488 | setup_arch(&command_line); |
489 | mm_init_owner(&init_mm, &init_task); |
490 | setup_command_line(command_line); |
491 | setup_nr_cpu_ids(); |
492 | setup_per_cpu_areas(); |
493 | smp_prepare_boot_cpu(); /* arch-specific boot-cpu hooks */ |
494 | |
495 | build_all_zonelists(NULL); |
496 | page_alloc_init(); |
497 | |
498 | printk(KERN_NOTICE "Kernel command line: %s\n", boot_command_line); |
499 | parse_early_param(); |
500 | parse_args("Booting kernel", static_command_line, __start___param, |
501 | __stop___param - __start___param, |
502 | &unknown_bootoption); |
503 | /* |
504 | * These use large bootmem allocations and must precede |
505 | * kmem_cache_init() |
506 | */ |
507 | pidhash_init(); |
508 | vfs_caches_init_early(); |
509 | sort_main_extable(); |
510 | trap_init(); |
511 | mm_init(); |
512 | /* |
513 | * Set up the scheduler prior starting any interrupts (such as the |
514 | * timer interrupt). Full topology setup happens at smp_init() |
515 | * time - but meanwhile we still have a functioning scheduler. |
516 | */ |
517 | sched_init(); |
518 | /* |
519 | * Disable preemption - early bootup scheduling is extremely |
520 | * fragile until we cpu_idle() for the first time. |
521 | */ |
522 | preempt_disable(); |
523 | if (!irqs_disabled()) { |
524 | printk(KERN_WARNING "start_kernel(): bug: interrupts were " |
525 | "enabled *very* early, fixing it\n"); |
526 | local_irq_disable(); |
527 | } |
528 | idr_init_cache(); |
529 | perf_event_init(); |
530 | rcu_init(); |
531 | radix_tree_init(); |
532 | /* init some links before init_ISA_irqs() */ |
533 | early_irq_init(); |
534 | init_IRQ(); |
535 | prio_tree_init(); |
536 | init_timers(); |
537 | hrtimers_init(); |
538 | softirq_init(); |
539 | timekeeping_init(); |
540 | time_init(); |
541 | profile_init(); |
542 | if (!irqs_disabled()) |
543 | printk(KERN_CRIT "start_kernel(): bug: interrupts were " |
544 | "enabled early\n"); |
545 | early_boot_irqs_disabled = false; |
546 | local_irq_enable(); |
547 | |
548 | /* Interrupts are enabled now so all GFP allocations are safe. */ |
549 | gfp_allowed_mask = __GFP_BITS_MASK; |
550 | |
551 | kmem_cache_init_late(); |
552 | |
553 | /* |
554 | * HACK ALERT! This is early. We're enabling the console before |
555 | * we've done PCI setups etc, and console_init() must be aware of |
556 | * this. But we do want output early, in case something goes wrong. |
557 | */ |
558 | console_init(); |
559 | if (panic_later) |
560 | panic(panic_later, panic_param); |
561 | |
562 | lockdep_info(); |
563 | |
564 | /* |
565 | * Need to run this when irqs are enabled, because it wants |
566 | * to self-test [hard/soft]-irqs on/off lock inversion bugs |
567 | * too: |
568 | */ |
569 | locking_selftest(); |
570 | |
571 | #ifdef CONFIG_BLK_DEV_INITRD |
572 | if (initrd_start && !initrd_below_start_ok && |
573 | page_to_pfn(virt_to_page((void *)initrd_start)) < min_low_pfn) { |
574 | printk(KERN_CRIT "initrd overwritten (0x%08lx < 0x%08lx) - " |
575 | "disabling it.\n", |
576 | page_to_pfn(virt_to_page((void *)initrd_start)), |
577 | min_low_pfn); |
578 | initrd_start = 0; |
579 | } |
580 | #endif |
581 | page_cgroup_init(); |
582 | enable_debug_pagealloc(); |
583 | kmemleak_init(); |
584 | debug_objects_mem_init(); |
585 | setup_per_cpu_pageset(); |
586 | numa_policy_init(); |
587 | if (late_time_init) |
588 | late_time_init(); |
589 | sched_clock_init(); |
590 | calibrate_delay(); |
591 | pidmap_init(); |
592 | anon_vma_init(); |
593 | #ifdef CONFIG_X86 |
594 | if (efi_enabled) |
595 | efi_enter_virtual_mode(); |
596 | #endif |
597 | thread_info_cache_init(); |
598 | cred_init(); |
599 | fork_init(totalram_pages); |
600 | proc_caches_init(); |
601 | buffer_init(); |
602 | key_init(); |
603 | security_init(); |
604 | dbg_late_init(); |
605 | vfs_caches_init(totalram_pages); |
606 | signals_init(); |
607 | /* rootfs populating might need page-writeback */ |
608 | page_writeback_init(); |
609 | #ifdef CONFIG_PROC_FS |
610 | proc_root_init(); |
611 | #endif |
612 | cgroup_init(); |
613 | cpuset_init(); |
614 | taskstats_init_early(); |
615 | delayacct_init(); |
616 | |
617 | check_bugs(); |
618 | |
619 | acpi_early_init(); /* before LAPIC and SMP init */ |
620 | sfi_init_late(); |
621 | |
622 | ftrace_init(); |
623 | |
624 | /* Do the rest non-__init'ed, we're now alive */ |
625 | rest_init(); |
626 | } |
627 | |
628 | /* Call all constructor functions linked into the kernel. */ |
629 | static void __init do_ctors(void) |
630 | { |
631 | #ifdef CONFIG_CONSTRUCTORS |
632 | ctor_fn_t *fn = (ctor_fn_t *) __ctors_start; |
633 | |
634 | for (; fn < (ctor_fn_t *) __ctors_end; fn++) |
635 | (*fn)(); |
636 | #endif |
637 | } |
638 | |
639 | int initcall_debug; |
640 | core_param(initcall_debug, initcall_debug, bool, 0644); |
641 | |
642 | static char msgbuf[64]; |
643 | |
644 | static int __init_or_module do_one_initcall_debug(initcall_t fn) |
645 | { |
646 | ktime_t calltime, delta, rettime; |
647 | unsigned long long duration; |
648 | int ret; |
649 | |
650 | printk(KERN_DEBUG "calling %pF @ %i\n", fn, task_pid_nr(current)); |
651 | calltime = ktime_get(); |
652 | ret = fn(); |
653 | rettime = ktime_get(); |
654 | delta = ktime_sub(rettime, calltime); |
655 | duration = (unsigned long long) ktime_to_ns(delta) >> 10; |
656 | printk(KERN_DEBUG "initcall %pF returned %d after %lld usecs\n", fn, |
657 | ret, duration); |
658 | |
659 | return ret; |
660 | } |
661 | |
662 | int __init_or_module do_one_initcall(initcall_t fn) |
663 | { |
664 | int count = preempt_count(); |
665 | int ret; |
666 | |
667 | if (initcall_debug) |
668 | ret = do_one_initcall_debug(fn); |
669 | else |
670 | ret = fn(); |
671 | |
672 | msgbuf[0] = 0; |
673 | |
674 | if (ret && ret != -ENODEV && initcall_debug) |
675 | sprintf(msgbuf, "error code %d ", ret); |
676 | |
677 | if (preempt_count() != count) { |
678 | strlcat(msgbuf, "preemption imbalance ", sizeof(msgbuf)); |
679 | preempt_count() = count; |
680 | } |
681 | if (irqs_disabled()) { |
682 | strlcat(msgbuf, "disabled interrupts ", sizeof(msgbuf)); |
683 | local_irq_enable(); |
684 | } |
685 | if (msgbuf[0]) { |
686 | printk("initcall %pF returned with %s\n", fn, msgbuf); |
687 | } |
688 | |
689 | return ret; |
690 | } |
691 | |
692 | |
693 | extern initcall_t __initcall_start[], __initcall_end[], __early_initcall_end[]; |
694 | |
695 | static void __init do_initcalls(void) |
696 | { |
697 | initcall_t *fn; |
698 | |
699 | for (fn = __early_initcall_end; fn < __initcall_end; fn++) |
700 | do_one_initcall(*fn); |
701 | } |
702 | |
703 | /* |
704 | * Ok, the machine is now initialized. None of the devices |
705 | * have been touched yet, but the CPU subsystem is up and |
706 | * running, and memory and process management works. |
707 | * |
708 | * Now we can finally start doing some real work.. |
709 | */ |
710 | static void __init do_basic_setup(void) |
711 | { |
712 | cpuset_init_smp(); |
713 | usermodehelper_init(); |
714 | init_tmpfs(); |
715 | driver_init(); |
716 | init_irq_proc(); |
717 | do_ctors(); |
718 | do_initcalls(); |
719 | } |
720 | |
721 | static void __init do_pre_smp_initcalls(void) |
722 | { |
723 | initcall_t *fn; |
724 | |
725 | for (fn = __initcall_start; fn < __early_initcall_end; fn++) |
726 | do_one_initcall(*fn); |
727 | } |
728 | |
729 | static void run_init_process(const char *init_filename) |
730 | { |
731 | argv_init[0] = init_filename; |
732 | kernel_execve(init_filename, argv_init, envp_init); |
733 | } |
734 | |
735 | /* This is a non __init function. Force it to be noinline otherwise gcc |
736 | * makes it inline to init() and it becomes part of init.text section |
737 | */ |
738 | static noinline int init_post(void) |
739 | { |
740 | /* need to finish all async __init code before freeing the memory */ |
741 | async_synchronize_full(); |
742 | free_initmem(); |
743 | mark_rodata_ro(); |
744 | system_state = SYSTEM_RUNNING; |
745 | numa_default_policy(); |
746 | |
747 | |
748 | current->signal->flags |= SIGNAL_UNKILLABLE; |
749 | |
750 | if (ramdisk_execute_command) { |
751 | run_init_process(ramdisk_execute_command); |
752 | printk(KERN_WARNING "Failed to execute %s\n", |
753 | ramdisk_execute_command); |
754 | } |
755 | |
756 | /* |
757 | * We try each of these until one succeeds. |
758 | * |
759 | * The Bourne shell can be used instead of init if we are |
760 | * trying to recover a really broken machine. |
761 | */ |
762 | if (execute_command) { |
763 | run_init_process(execute_command); |
764 | printk(KERN_WARNING "Failed to execute %s. Attempting " |
765 | "defaults...\n", execute_command); |
766 | } |
767 | run_init_process("/sbin/init"); |
768 | run_init_process("/etc/init"); |
769 | run_init_process("/bin/init"); |
770 | run_init_process("/bin/sh"); |
771 | |
772 | panic("No init found. Try passing init= option to kernel. " |
773 | "See Linux Documentation/init.txt for guidance."); |
774 | } |
775 | |
776 | static int __init kernel_init(void * unused) |
777 | { |
778 | /* |
779 | * Wait until kthreadd is all set-up. |
780 | */ |
781 | wait_for_completion(&kthreadd_done); |
782 | /* |
783 | * init can allocate pages on any node |
784 | */ |
785 | set_mems_allowed(node_states[N_HIGH_MEMORY]); |
786 | /* |
787 | * init can run on any cpu. |
788 | */ |
789 | set_cpus_allowed_ptr(current, cpu_all_mask); |
790 | |
791 | cad_pid = task_pid(current); |
792 | |
793 | smp_prepare_cpus(setup_max_cpus); |
794 | |
795 | do_pre_smp_initcalls(); |
796 | lockup_detector_init(); |
797 | |
798 | smp_init(); |
799 | sched_init_smp(); |
800 | |
801 | do_basic_setup(); |
802 | |
803 | /* Open the /dev/console on the rootfs, this should never fail */ |
804 | if (sys_open((const char __user *) "/dev/console", O_RDWR, 0) < 0) |
805 | printk(KERN_WARNING "Warning: unable to open an initial console.\n"); |
806 | |
807 | (void) sys_dup(0); |
808 | (void) sys_dup(0); |
809 | /* |
810 | * check if there is an early userspace init. If yes, let it do all |
811 | * the work |
812 | */ |
813 | |
814 | if (!ramdisk_execute_command) |
815 | ramdisk_execute_command = "/init"; |
816 | |
817 | if (sys_access((const char __user *) ramdisk_execute_command, 0) != 0) { |
818 | ramdisk_execute_command = NULL; |
819 | prepare_namespace(); |
820 | } |
821 | |
822 | /* |
823 | * Ok, we have completed the initial bootup, and |
824 | * we're essentially up and running. Get rid of the |
825 | * initmem segments and start the user-mode stuff.. |
826 | */ |
827 | |
828 | init_post(); |
829 | return 0; |
830 | } |
831 |
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