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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/string.h> | |
18 | #include <linux/ctype.h> | |
19 | #include <linux/delay.h> | |
20 | #include <linux/utsname.h> | |
21 | #include <linux/ioport.h> | |
22 | #include <linux/init.h> | |
23 | #include <linux/smp_lock.h> | |
24 | #include <linux/initrd.h> | |
25 | #include <linux/hdreg.h> | |
26 | #include <linux/bootmem.h> | |
27 | #include <linux/tty.h> | |
28 | #include <linux/gfp.h> | |
29 | #include <linux/percpu.h> | |
30 | #include <linux/kmod.h> | |
31 | #include <linux/kernel_stat.h> | |
32 | #include <linux/start_kernel.h> | |
33 | #include <linux/security.h> | |
34 | #include <linux/smp.h> | |
35 | #include <linux/workqueue.h> | |
36 | #include <linux/profile.h> | |
37 | #include <linux/rcupdate.h> | |
38 | #include <linux/moduleparam.h> | |
39 | #include <linux/kallsyms.h> | |
40 | #include <linux/writeback.h> | |
41 | #include <linux/cpu.h> | |
42 | #include <linux/cpuset.h> | |
43 | #include <linux/cgroup.h> | |
44 | #include <linux/efi.h> | |
45 | #include <linux/tick.h> | |
46 | #include <linux/interrupt.h> | |
47 | #include <linux/taskstats_kern.h> | |
48 | #include <linux/delayacct.h> | |
49 | #include <linux/unistd.h> | |
50 | #include <linux/rmap.h> | |
51 | #include <linux/mempolicy.h> | |
52 | #include <linux/key.h> | |
53 | #include <linux/unwind.h> | |
54 | #include <linux/buffer_head.h> | |
55 | #include <linux/debug_locks.h> | |
56 | #include <linux/debugobjects.h> | |
57 | #include <linux/lockdep.h> | |
58 | #include <linux/pid_namespace.h> | |
59 | #include <linux/device.h> | |
60 | #include <linux/kthread.h> | |
61 | #include <linux/sched.h> | |
62 | #include <linux/signal.h> | |
63 | #include <linux/idr.h> | |
64 | ||
65 | #include <asm/io.h> | |
66 | #include <asm/bugs.h> | |
67 | #include <asm/setup.h> | |
68 | #include <asm/sections.h> | |
69 | #include <asm/cacheflush.h> | |
70 | ||
71 | #ifdef CONFIG_X86_LOCAL_APIC | |
72 | #include <asm/smp.h> | |
73 | #endif | |
74 | ||
75 | /* | |
76 | * This is one of the first .c files built. Error out early if we have compiler | |
77 | * trouble. | |
78 | */ | |
79 | ||
80 | #if __GNUC__ == 4 && __GNUC_MINOR__ == 1 && __GNUC_PATCHLEVEL__ == 0 | |
81 | #warning gcc-4.1.0 is known to miscompile the kernel. A different compiler version is recommended. | |
82 | #endif | |
83 | ||
84 | static int kernel_init(void *); | |
85 | ||
86 | extern void init_IRQ(void); | |
87 | extern void fork_init(unsigned long); | |
88 | extern void mca_init(void); | |
89 | extern void sbus_init(void); | |
90 | extern void prio_tree_init(void); | |
91 | extern void radix_tree_init(void); | |
92 | extern void free_initmem(void); | |
93 | #ifdef CONFIG_ACPI | |
94 | extern void acpi_early_init(void); | |
95 | #else | |
96 | static inline void acpi_early_init(void) { } | |
97 | #endif | |
98 | #ifndef CONFIG_DEBUG_RODATA | |
99 | static inline void mark_rodata_ro(void) { } | |
100 | #endif | |
101 | ||
102 | #ifdef CONFIG_TC | |
103 | extern void tc_init(void); | |
104 | #endif | |
105 | ||
106 | enum system_states system_state; | |
107 | EXPORT_SYMBOL(system_state); | |
108 | ||
109 | /* | |
110 | * Boot command-line arguments | |
111 | */ | |
112 | #define MAX_INIT_ARGS CONFIG_INIT_ENV_ARG_LIMIT | |
113 | #define MAX_INIT_ENVS CONFIG_INIT_ENV_ARG_LIMIT | |
114 | ||
115 | extern void time_init(void); | |
116 | /* Default late time init is NULL. archs can override this later. */ | |
117 | void (*late_time_init)(void); | |
118 | extern void softirq_init(void); | |
119 | ||
120 | /* Untouched command line saved by arch-specific code. */ | |
121 | char __initdata boot_command_line[COMMAND_LINE_SIZE]; | |
122 | /* Untouched saved command line (eg. for /proc) */ | |
123 | char *saved_command_line; | |
124 | /* Command line for parameter parsing */ | |
125 | static char *static_command_line; | |
126 | ||
127 | static char *execute_command; | |
128 | static char *ramdisk_execute_command; | |
129 | ||
130 | #ifdef CONFIG_SMP | |
131 | /* Setup configured maximum number of CPUs to activate */ | |
132 | unsigned int __initdata setup_max_cpus = NR_CPUS; | |
133 | ||
134 | /* | |
135 | * Setup routine for controlling SMP activation | |
136 | * | |
137 | * Command-line option of "nosmp" or "maxcpus=0" will disable SMP | |
138 | * activation entirely (the MPS table probe still happens, though). | |
139 | * | |
140 | * Command-line option of "maxcpus=<NUM>", where <NUM> is an integer | |
141 | * greater than 0, limits the maximum number of CPUs activated in | |
142 | * SMP mode to <NUM>. | |
143 | */ | |
144 | #ifndef CONFIG_X86_IO_APIC | |
145 | static inline void disable_ioapic_setup(void) {}; | |
146 | #endif | |
147 | ||
148 | static int __init nosmp(char *str) | |
149 | { | |
150 | setup_max_cpus = 0; | |
151 | disable_ioapic_setup(); | |
152 | return 0; | |
153 | } | |
154 | ||
155 | early_param("nosmp", nosmp); | |
156 | ||
157 | static int __init maxcpus(char *str) | |
158 | { | |
159 | get_option(&str, &setup_max_cpus); | |
160 | if (setup_max_cpus == 0) | |
161 | disable_ioapic_setup(); | |
162 | ||
163 | return 0; | |
164 | } | |
165 | ||
166 | early_param("maxcpus", maxcpus); | |
167 | #else | |
168 | #define setup_max_cpus NR_CPUS | |
169 | #endif | |
170 | ||
171 | /* | |
172 | * If set, this is an indication to the drivers that reset the underlying | |
173 | * device before going ahead with the initialization otherwise driver might | |
174 | * rely on the BIOS and skip the reset operation. | |
175 | * | |
176 | * This is useful if kernel is booting in an unreliable environment. | |
177 | * For ex. kdump situaiton where previous kernel has crashed, BIOS has been | |
178 | * skipped and devices will be in unknown state. | |
179 | */ | |
180 | unsigned int reset_devices; | |
181 | EXPORT_SYMBOL(reset_devices); | |
182 | ||
183 | static int __init set_reset_devices(char *str) | |
184 | { | |
185 | reset_devices = 1; | |
186 | return 1; | |
187 | } | |
188 | ||
189 | __setup("reset_devices", set_reset_devices); | |
190 | ||
191 | static char * argv_init[MAX_INIT_ARGS+2] = { "init", NULL, }; | |
192 | char * envp_init[MAX_INIT_ENVS+2] = { "HOME=/", "TERM=linux", NULL, }; | |
193 | static const char *panic_later, *panic_param; | |
194 | ||
195 | extern struct obs_kernel_param __setup_start[], __setup_end[]; | |
196 | ||
197 | static int __init obsolete_checksetup(char *line) | |
198 | { | |
199 | struct obs_kernel_param *p; | |
200 | int had_early_param = 0; | |
201 | ||
202 | p = __setup_start; | |
203 | do { | |
204 | int n = strlen(p->str); | |
205 | if (!strncmp(line, p->str, n)) { | |
206 | if (p->early) { | |
207 | /* Already done in parse_early_param? | |
208 | * (Needs exact match on param part). | |
209 | * Keep iterating, as we can have early | |
210 | * params and __setups of same names 8( */ | |
211 | if (line[n] == '\0' || line[n] == '=') | |
212 | had_early_param = 1; | |
213 | } else if (!p->setup_func) { | |
214 | printk(KERN_WARNING "Parameter %s is obsolete," | |
215 | " ignored\n", p->str); | |
216 | return 1; | |
217 | } else if (p->setup_func(line + n)) | |
218 | return 1; | |
219 | } | |
220 | p++; | |
221 | } while (p < __setup_end); | |
222 | ||
223 | return had_early_param; | |
224 | } | |
225 | ||
226 | /* | |
227 | * This should be approx 2 Bo*oMips to start (note initial shift), and will | |
228 | * still work even if initially too large, it will just take slightly longer | |
229 | */ | |
230 | unsigned long loops_per_jiffy = (1<<12); | |
231 | ||
232 | EXPORT_SYMBOL(loops_per_jiffy); | |
233 | ||
234 | static int __init debug_kernel(char *str) | |
235 | { | |
236 | console_loglevel = 10; | |
237 | return 0; | |
238 | } | |
239 | ||
240 | static int __init quiet_kernel(char *str) | |
241 | { | |
242 | console_loglevel = 4; | |
243 | return 0; | |
244 | } | |
245 | ||
246 | early_param("debug", debug_kernel); | |
247 | early_param("quiet", quiet_kernel); | |
248 | ||
249 | static int __init loglevel(char *str) | |
250 | { | |
251 | get_option(&str, &console_loglevel); | |
252 | return 0; | |
253 | } | |
254 | ||
255 | early_param("loglevel", loglevel); | |
256 | ||
257 | /* | |
258 | * Unknown boot options get handed to init, unless they look like | |
259 | * failed parameters | |
260 | */ | |
261 | static int __init unknown_bootoption(char *param, char *val) | |
262 | { | |
263 | /* Change NUL term back to "=", to make "param" the whole string. */ | |
264 | if (val) { | |
265 | /* param=val or param="val"? */ | |
266 | if (val == param+strlen(param)+1) | |
267 | val[-1] = '='; | |
268 | else if (val == param+strlen(param)+2) { | |
269 | val[-2] = '='; | |
270 | memmove(val-1, val, strlen(val)+1); | |
271 | val--; | |
272 | } else | |
273 | BUG(); | |
274 | } | |
275 | ||
276 | /* Handle obsolete-style parameters */ | |
277 | if (obsolete_checksetup(param)) | |
278 | return 0; | |
279 | ||
280 | /* | |
281 | * Preemptive maintenance for "why didn't my misspelled command | |
282 | * line work?" | |
283 | */ | |
284 | if (strchr(param, '.') && (!val || strchr(param, '.') < val)) { | |
285 | printk(KERN_ERR "Unknown boot option `%s': ignoring\n", param); | |
286 | return 0; | |
287 | } | |
288 | ||
289 | if (panic_later) | |
290 | return 0; | |
291 | ||
292 | if (val) { | |
293 | /* Environment option */ | |
294 | unsigned int i; | |
295 | for (i = 0; envp_init[i]; i++) { | |
296 | if (i == MAX_INIT_ENVS) { | |
297 | panic_later = "Too many boot env vars at `%s'"; | |
298 | panic_param = param; | |
299 | } | |
300 | if (!strncmp(param, envp_init[i], val - param)) | |
301 | break; | |
302 | } | |
303 | envp_init[i] = param; | |
304 | } else { | |
305 | /* Command line option */ | |
306 | unsigned int i; | |
307 | for (i = 0; argv_init[i]; i++) { | |
308 | if (i == MAX_INIT_ARGS) { | |
309 | panic_later = "Too many boot init vars at `%s'"; | |
310 | panic_param = param; | |
311 | } | |
312 | } | |
313 | argv_init[i] = param; | |
314 | } | |
315 | return 0; | |
316 | } | |
317 | ||
318 | #ifdef CONFIG_DEBUG_PAGEALLOC | |
319 | int __read_mostly debug_pagealloc_enabled = 0; | |
320 | #endif | |
321 | ||
322 | static int __init init_setup(char *str) | |
323 | { | |
324 | unsigned int i; | |
325 | ||
326 | execute_command = str; | |
327 | /* | |
328 | * In case LILO is going to boot us with default command line, | |
329 | * it prepends "auto" before the whole cmdline which makes | |
330 | * the shell think it should execute a script with such name. | |
331 | * So we ignore all arguments entered _before_ init=... [MJ] | |
332 | */ | |
333 | for (i = 1; i < MAX_INIT_ARGS; i++) | |
334 | argv_init[i] = NULL; | |
335 | return 1; | |
336 | } | |
337 | __setup("init=", init_setup); | |
338 | ||
339 | static int __init rdinit_setup(char *str) | |
340 | { | |
341 | unsigned int i; | |
342 | ||
343 | ramdisk_execute_command = str; | |
344 | /* See "auto" comment in init_setup */ | |
345 | for (i = 1; i < MAX_INIT_ARGS; i++) | |
346 | argv_init[i] = NULL; | |
347 | return 1; | |
348 | } | |
349 | __setup("rdinit=", rdinit_setup); | |
350 | ||
351 | #ifndef CONFIG_SMP | |
352 | ||
353 | #ifdef CONFIG_X86_LOCAL_APIC | |
354 | static void __init smp_init(void) | |
355 | { | |
356 | APIC_init_uniprocessor(); | |
357 | } | |
358 | #else | |
359 | #define smp_init() do { } while (0) | |
360 | #endif | |
361 | ||
362 | static inline void setup_per_cpu_areas(void) { } | |
363 | static inline void setup_nr_cpu_ids(void) { } | |
364 | static inline void smp_prepare_cpus(unsigned int maxcpus) { } | |
365 | ||
366 | #else | |
367 | ||
368 | #if NR_CPUS > BITS_PER_LONG | |
369 | cpumask_t cpu_mask_all __read_mostly = CPU_MASK_ALL; | |
370 | EXPORT_SYMBOL(cpu_mask_all); | |
371 | #endif | |
372 | ||
373 | /* Setup number of possible processor ids */ | |
374 | int nr_cpu_ids __read_mostly = NR_CPUS; | |
375 | EXPORT_SYMBOL(nr_cpu_ids); | |
376 | ||
377 | /* An arch may set nr_cpu_ids earlier if needed, so this would be redundant */ | |
378 | static void __init setup_nr_cpu_ids(void) | |
379 | { | |
380 | int cpu, highest_cpu = 0; | |
381 | ||
382 | for_each_possible_cpu(cpu) | |
383 | highest_cpu = cpu; | |
384 | ||
385 | nr_cpu_ids = highest_cpu + 1; | |
386 | } | |
387 | ||
388 | #ifndef CONFIG_HAVE_SETUP_PER_CPU_AREA | |
389 | unsigned long __per_cpu_offset[NR_CPUS] __read_mostly; | |
390 | ||
391 | EXPORT_SYMBOL(__per_cpu_offset); | |
392 | ||
393 | static void __init setup_per_cpu_areas(void) | |
394 | { | |
395 | unsigned long size, i; | |
396 | char *ptr; | |
397 | unsigned long nr_possible_cpus = num_possible_cpus(); | |
398 | ||
399 | /* Copy section for each CPU (we discard the original) */ | |
400 | size = ALIGN(PERCPU_ENOUGH_ROOM, PAGE_SIZE); | |
401 | ptr = alloc_bootmem_pages(size * nr_possible_cpus); | |
402 | ||
403 | for_each_possible_cpu(i) { | |
404 | __per_cpu_offset[i] = ptr - __per_cpu_start; | |
405 | memcpy(ptr, __per_cpu_start, __per_cpu_end - __per_cpu_start); | |
406 | ptr += size; | |
407 | } | |
408 | } | |
409 | #endif /* CONFIG_HAVE_SETUP_PER_CPU_AREA */ | |
410 | ||
411 | /* Called by boot processor to activate the rest. */ | |
412 | static void __init smp_init(void) | |
413 | { | |
414 | unsigned int cpu; | |
415 | ||
416 | /* | |
417 | * Set up the current CPU as possible to migrate to. | |
418 | * The other ones will be done by cpu_up/cpu_down() | |
419 | */ | |
420 | cpu = smp_processor_id(); | |
421 | cpu_set(cpu, cpu_active_map); | |
422 | ||
423 | /* FIXME: This should be done in userspace --RR */ | |
424 | for_each_present_cpu(cpu) { | |
425 | if (num_online_cpus() >= setup_max_cpus) | |
426 | break; | |
427 | if (!cpu_online(cpu)) | |
428 | cpu_up(cpu); | |
429 | } | |
430 | ||
431 | /* Any cleanup work */ | |
432 | printk(KERN_INFO "Brought up %ld CPUs\n", (long)num_online_cpus()); | |
433 | smp_cpus_done(setup_max_cpus); | |
434 | } | |
435 | ||
436 | #endif | |
437 | ||
438 | /* | |
439 | * We need to store the untouched command line for future reference. | |
440 | * We also need to store the touched command line since the parameter | |
441 | * parsing is performed in place, and we should allow a component to | |
442 | * store reference of name/value for future reference. | |
443 | */ | |
444 | static void __init setup_command_line(char *command_line) | |
445 | { | |
446 | saved_command_line = alloc_bootmem(strlen (boot_command_line)+1); | |
447 | static_command_line = alloc_bootmem(strlen (command_line)+1); | |
448 | strcpy (saved_command_line, boot_command_line); | |
449 | strcpy (static_command_line, command_line); | |
450 | } | |
451 | ||
452 | /* | |
453 | * We need to finalize in a non-__init function or else race conditions | |
454 | * between the root thread and the init thread may cause start_kernel to | |
455 | * be reaped by free_initmem before the root thread has proceeded to | |
456 | * cpu_idle. | |
457 | * | |
458 | * gcc-3.4 accidentally inlines this function, so use noinline. | |
459 | */ | |
460 | ||
461 | static void noinline __init_refok rest_init(void) | |
462 | __releases(kernel_lock) | |
463 | { | |
464 | int pid; | |
465 | ||
466 | kernel_thread(kernel_init, NULL, CLONE_FS | CLONE_SIGHAND); | |
467 | numa_default_policy(); | |
468 | pid = kernel_thread(kthreadd, NULL, CLONE_FS | CLONE_FILES); | |
469 | kthreadd_task = find_task_by_pid_ns(pid, &init_pid_ns); | |
470 | unlock_kernel(); | |
471 | ||
472 | /* | |
473 | * The boot idle thread must execute schedule() | |
474 | * at least once to get things moving: | |
475 | */ | |
476 | init_idle_bootup_task(current); | |
477 | preempt_enable_no_resched(); | |
478 | schedule(); | |
479 | preempt_disable(); | |
480 | ||
481 | /* Call into cpu_idle with preempt disabled */ | |
482 | cpu_idle(); | |
483 | } | |
484 | ||
485 | /* Check for early params. */ | |
486 | static int __init do_early_param(char *param, char *val) | |
487 | { | |
488 | struct obs_kernel_param *p; | |
489 | ||
490 | for (p = __setup_start; p < __setup_end; p++) { | |
491 | if ((p->early && strcmp(param, p->str) == 0) || | |
492 | (strcmp(param, "console") == 0 && | |
493 | strcmp(p->str, "earlycon") == 0) | |
494 | ) { | |
495 | if (p->setup_func(val) != 0) | |
496 | printk(KERN_WARNING | |
497 | "Malformed early option '%s'\n", param); | |
498 | } | |
499 | } | |
500 | /* We accept everything at this stage. */ | |
501 | return 0; | |
502 | } | |
503 | ||
504 | /* Arch code calls this early on, or if not, just before other parsing. */ | |
505 | void __init parse_early_param(void) | |
506 | { | |
507 | static __initdata int done = 0; | |
508 | static __initdata char tmp_cmdline[COMMAND_LINE_SIZE]; | |
509 | ||
510 | if (done) | |
511 | return; | |
512 | ||
513 | /* All fall through to do_early_param. */ | |
514 | strlcpy(tmp_cmdline, boot_command_line, COMMAND_LINE_SIZE); | |
515 | parse_args("early options", tmp_cmdline, NULL, 0, do_early_param); | |
516 | done = 1; | |
517 | } | |
518 | ||
519 | /* | |
520 | * Activate the first processor. | |
521 | */ | |
522 | ||
523 | static void __init boot_cpu_init(void) | |
524 | { | |
525 | int cpu = smp_processor_id(); | |
526 | /* Mark the boot cpu "present", "online" etc for SMP and UP case */ | |
527 | cpu_set(cpu, cpu_online_map); | |
528 | cpu_set(cpu, cpu_present_map); | |
529 | cpu_set(cpu, cpu_possible_map); | |
530 | } | |
531 | ||
532 | void __init __weak smp_setup_processor_id(void) | |
533 | { | |
534 | } | |
535 | ||
536 | void __init __weak thread_info_cache_init(void) | |
537 | { | |
538 | } | |
539 | ||
540 | asmlinkage void __init start_kernel(void) | |
541 | { | |
542 | char * command_line; | |
543 | extern struct kernel_param __start___param[], __stop___param[]; | |
544 | ||
545 | smp_setup_processor_id(); | |
546 | ||
547 | /* | |
548 | * Need to run as early as possible, to initialize the | |
549 | * lockdep hash: | |
550 | */ | |
551 | unwind_init(); | |
552 | lockdep_init(); | |
553 | debug_objects_early_init(); | |
554 | cgroup_init_early(); | |
555 | ||
556 | local_irq_disable(); | |
557 | early_boot_irqs_off(); | |
558 | early_init_irq_lock_class(); | |
559 | ||
560 | /* | |
561 | * Interrupts are still disabled. Do necessary setups, then | |
562 | * enable them | |
563 | */ | |
564 | lock_kernel(); | |
565 | tick_init(); | |
566 | boot_cpu_init(); | |
567 | page_address_init(); | |
568 | printk(KERN_NOTICE); | |
569 | printk(linux_banner); | |
570 | setup_arch(&command_line); | |
571 | mm_init_owner(&init_mm, &init_task); | |
572 | setup_command_line(command_line); | |
573 | unwind_setup(); | |
574 | setup_per_cpu_areas(); | |
575 | setup_nr_cpu_ids(); | |
576 | smp_prepare_boot_cpu(); /* arch-specific boot-cpu hooks */ | |
577 | ||
578 | /* | |
579 | * Set up the scheduler prior starting any interrupts (such as the | |
580 | * timer interrupt). Full topology setup happens at smp_init() | |
581 | * time - but meanwhile we still have a functioning scheduler. | |
582 | */ | |
583 | sched_init(); | |
584 | /* | |
585 | * Disable preemption - early bootup scheduling is extremely | |
586 | * fragile until we cpu_idle() for the first time. | |
587 | */ | |
588 | preempt_disable(); | |
589 | build_all_zonelists(); | |
590 | page_alloc_init(); | |
591 | printk(KERN_NOTICE "Kernel command line: %s\n", boot_command_line); | |
592 | parse_early_param(); | |
593 | parse_args("Booting kernel", static_command_line, __start___param, | |
594 | __stop___param - __start___param, | |
595 | &unknown_bootoption); | |
596 | if (!irqs_disabled()) { | |
597 | printk(KERN_WARNING "start_kernel(): bug: interrupts were " | |
598 | "enabled *very* early, fixing it\n"); | |
599 | local_irq_disable(); | |
600 | } | |
601 | sort_main_extable(); | |
602 | trap_init(); | |
603 | rcu_init(); | |
604 | init_IRQ(); | |
605 | pidhash_init(); | |
606 | init_timers(); | |
607 | hrtimers_init(); | |
608 | softirq_init(); | |
609 | timekeeping_init(); | |
610 | time_init(); | |
611 | sched_clock_init(); | |
612 | profile_init(); | |
613 | if (!irqs_disabled()) | |
614 | printk("start_kernel(): bug: interrupts were enabled early\n"); | |
615 | early_boot_irqs_on(); | |
616 | local_irq_enable(); | |
617 | ||
618 | /* | |
619 | * HACK ALERT! This is early. We're enabling the console before | |
620 | * we've done PCI setups etc, and console_init() must be aware of | |
621 | * this. But we do want output early, in case something goes wrong. | |
622 | */ | |
623 | console_init(); | |
624 | if (panic_later) | |
625 | panic(panic_later, panic_param); | |
626 | ||
627 | lockdep_info(); | |
628 | ||
629 | /* | |
630 | * Need to run this when irqs are enabled, because it wants | |
631 | * to self-test [hard/soft]-irqs on/off lock inversion bugs | |
632 | * too: | |
633 | */ | |
634 | locking_selftest(); | |
635 | ||
636 | #ifdef CONFIG_BLK_DEV_INITRD | |
637 | if (initrd_start && !initrd_below_start_ok && | |
638 | page_to_pfn(virt_to_page(initrd_start)) < min_low_pfn) { | |
639 | printk(KERN_CRIT "initrd overwritten (0x%08lx < 0x%08lx) - " | |
640 | "disabling it.\n", | |
641 | page_to_pfn(virt_to_page(initrd_start)), min_low_pfn); | |
642 | initrd_start = 0; | |
643 | } | |
644 | #endif | |
645 | vfs_caches_init_early(); | |
646 | cpuset_init_early(); | |
647 | mem_init(); | |
648 | enable_debug_pagealloc(); | |
649 | cpu_hotplug_init(); | |
650 | kmem_cache_init(); | |
651 | debug_objects_mem_init(); | |
652 | idr_init_cache(); | |
653 | setup_per_cpu_pageset(); | |
654 | numa_policy_init(); | |
655 | if (late_time_init) | |
656 | late_time_init(); | |
657 | calibrate_delay(); | |
658 | pidmap_init(); | |
659 | pgtable_cache_init(); | |
660 | prio_tree_init(); | |
661 | anon_vma_init(); | |
662 | #ifdef CONFIG_X86 | |
663 | if (efi_enabled) | |
664 | efi_enter_virtual_mode(); | |
665 | #endif | |
666 | thread_info_cache_init(); | |
667 | fork_init(num_physpages); | |
668 | proc_caches_init(); | |
669 | buffer_init(); | |
670 | unnamed_dev_init(); | |
671 | key_init(); | |
672 | security_init(); | |
673 | vfs_caches_init(num_physpages); | |
674 | radix_tree_init(); | |
675 | signals_init(); | |
676 | /* rootfs populating might need page-writeback */ | |
677 | page_writeback_init(); | |
678 | #ifdef CONFIG_PROC_FS | |
679 | proc_root_init(); | |
680 | #endif | |
681 | cgroup_init(); | |
682 | cpuset_init(); | |
683 | taskstats_init_early(); | |
684 | delayacct_init(); | |
685 | ||
686 | check_bugs(); | |
687 | ||
688 | acpi_early_init(); /* before LAPIC and SMP init */ | |
689 | ||
690 | /* Do the rest non-__init'ed, we're now alive */ | |
691 | rest_init(); | |
692 | } | |
693 | ||
694 | static int __initdata initcall_debug; | |
695 | ||
696 | static int __init initcall_debug_setup(char *str) | |
697 | { | |
698 | initcall_debug = 1; | |
699 | return 1; | |
700 | } | |
701 | __setup("initcall_debug", initcall_debug_setup); | |
702 | ||
703 | static void __init do_one_initcall(initcall_t fn) | |
704 | { | |
705 | int count = preempt_count(); | |
706 | ktime_t t0, t1, delta; | |
707 | char msgbuf[64]; | |
708 | int result; | |
709 | ||
710 | if (initcall_debug) { | |
711 | print_fn_descriptor_symbol("calling %s\n", fn); | |
712 | t0 = ktime_get(); | |
713 | } | |
714 | ||
715 | result = fn(); | |
716 | ||
717 | if (initcall_debug) { | |
718 | t1 = ktime_get(); | |
719 | delta = ktime_sub(t1, t0); | |
720 | ||
721 | print_fn_descriptor_symbol("initcall %s", fn); | |
722 | printk(" returned %d after %Ld msecs\n", result, | |
723 | (unsigned long long) delta.tv64 >> 20); | |
724 | } | |
725 | ||
726 | msgbuf[0] = 0; | |
727 | ||
728 | if (result && result != -ENODEV && initcall_debug) | |
729 | sprintf(msgbuf, "error code %d ", result); | |
730 | ||
731 | if (preempt_count() != count) { | |
732 | strlcat(msgbuf, "preemption imbalance ", sizeof(msgbuf)); | |
733 | preempt_count() = count; | |
734 | } | |
735 | if (irqs_disabled()) { | |
736 | strlcat(msgbuf, "disabled interrupts ", sizeof(msgbuf)); | |
737 | local_irq_enable(); | |
738 | } | |
739 | if (msgbuf[0]) { | |
740 | print_fn_descriptor_symbol(KERN_WARNING "initcall %s", fn); | |
741 | printk(" returned with %s\n", msgbuf); | |
742 | } | |
743 | } | |
744 | ||
745 | ||
746 | extern initcall_t __initcall_start[], __initcall_end[], __early_initcall_end[]; | |
747 | ||
748 | static void __init do_initcalls(void) | |
749 | { | |
750 | initcall_t *call; | |
751 | ||
752 | for (call = __early_initcall_end; call < __initcall_end; call++) | |
753 | do_one_initcall(*call); | |
754 | ||
755 | /* Make sure there is no pending stuff from the initcall sequence */ | |
756 | flush_scheduled_work(); | |
757 | } | |
758 | ||
759 | /* | |
760 | * Ok, the machine is now initialized. None of the devices | |
761 | * have been touched yet, but the CPU subsystem is up and | |
762 | * running, and memory and process management works. | |
763 | * | |
764 | * Now we can finally start doing some real work.. | |
765 | */ | |
766 | static void __init do_basic_setup(void) | |
767 | { | |
768 | rcu_init_sched(); /* needed by module_init stage. */ | |
769 | /* drivers will send hotplug events */ | |
770 | init_workqueues(); | |
771 | usermodehelper_init(); | |
772 | driver_init(); | |
773 | init_irq_proc(); | |
774 | do_initcalls(); | |
775 | } | |
776 | ||
777 | static int __initdata nosoftlockup; | |
778 | ||
779 | static int __init nosoftlockup_setup(char *str) | |
780 | { | |
781 | nosoftlockup = 1; | |
782 | return 1; | |
783 | } | |
784 | __setup("nosoftlockup", nosoftlockup_setup); | |
785 | ||
786 | static void __init __do_pre_smp_initcalls(void) | |
787 | { | |
788 | initcall_t *call; | |
789 | ||
790 | for (call = __initcall_start; call < __early_initcall_end; call++) | |
791 | do_one_initcall(*call); | |
792 | } | |
793 | ||
794 | static void __init do_pre_smp_initcalls(void) | |
795 | { | |
796 | extern int spawn_ksoftirqd(void); | |
797 | ||
798 | init_call_single_data(); | |
799 | migration_init(); | |
800 | spawn_ksoftirqd(); | |
801 | if (!nosoftlockup) | |
802 | spawn_softlockup_task(); | |
803 | } | |
804 | ||
805 | static void run_init_process(char *init_filename) | |
806 | { | |
807 | argv_init[0] = init_filename; | |
808 | kernel_execve(init_filename, argv_init, envp_init); | |
809 | } | |
810 | ||
811 | /* This is a non __init function. Force it to be noinline otherwise gcc | |
812 | * makes it inline to init() and it becomes part of init.text section | |
813 | */ | |
814 | static int noinline init_post(void) | |
815 | { | |
816 | free_initmem(); | |
817 | unlock_kernel(); | |
818 | mark_rodata_ro(); | |
819 | system_state = SYSTEM_RUNNING; | |
820 | numa_default_policy(); | |
821 | ||
822 | if (sys_open((const char __user *) "/dev/console", O_RDWR, 0) < 0) | |
823 | printk(KERN_WARNING "Warning: unable to open an initial console.\n"); | |
824 | ||
825 | (void) sys_dup(0); | |
826 | (void) sys_dup(0); | |
827 | ||
828 | current->signal->flags |= SIGNAL_UNKILLABLE; | |
829 | ||
830 | if (ramdisk_execute_command) { | |
831 | run_init_process(ramdisk_execute_command); | |
832 | printk(KERN_WARNING "Failed to execute %s\n", | |
833 | ramdisk_execute_command); | |
834 | } | |
835 | ||
836 | /* | |
837 | * We try each of these until one succeeds. | |
838 | * | |
839 | * The Bourne shell can be used instead of init if we are | |
840 | * trying to recover a really broken machine. | |
841 | */ | |
842 | if (execute_command) { | |
843 | run_init_process(execute_command); | |
844 | printk(KERN_WARNING "Failed to execute %s. Attempting " | |
845 | "defaults...\n", execute_command); | |
846 | } | |
847 | run_init_process("/sbin/init"); | |
848 | run_init_process("/etc/init"); | |
849 | run_init_process("/bin/init"); | |
850 | run_init_process("/bin/sh"); | |
851 | ||
852 | panic("No init found. Try passing init= option to kernel."); | |
853 | } | |
854 | ||
855 | static int __init kernel_init(void * unused) | |
856 | { | |
857 | lock_kernel(); | |
858 | /* | |
859 | * init can run on any cpu. | |
860 | */ | |
861 | set_cpus_allowed_ptr(current, CPU_MASK_ALL_PTR); | |
862 | /* | |
863 | * Tell the world that we're going to be the grim | |
864 | * reaper of innocent orphaned children. | |
865 | * | |
866 | * We don't want people to have to make incorrect | |
867 | * assumptions about where in the task array this | |
868 | * can be found. | |
869 | */ | |
870 | init_pid_ns.child_reaper = current; | |
871 | ||
872 | cad_pid = task_pid(current); | |
873 | ||
874 | smp_prepare_cpus(setup_max_cpus); | |
875 | ||
876 | __do_pre_smp_initcalls(); | |
877 | do_pre_smp_initcalls(); | |
878 | ||
879 | smp_init(); | |
880 | sched_init_smp(); | |
881 | ||
882 | cpuset_init_smp(); | |
883 | ||
884 | do_basic_setup(); | |
885 | ||
886 | /* | |
887 | * check if there is an early userspace init. If yes, let it do all | |
888 | * the work | |
889 | */ | |
890 | ||
891 | if (!ramdisk_execute_command) | |
892 | ramdisk_execute_command = "/init"; | |
893 | ||
894 | if (sys_access((const char __user *) ramdisk_execute_command, 0) != 0) { | |
895 | ramdisk_execute_command = NULL; | |
896 | prepare_namespace(); | |
897 | } | |
898 | ||
899 | /* | |
900 | * Ok, we have completed the initial bootup, and | |
901 | * we're essentially up and running. Get rid of the | |
902 | * initmem segments and start the user-mode stuff.. | |
903 | */ | |
904 | init_post(); | |
905 | return 0; | |
906 | } |