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Commit | Line | Data |
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1da177e4 LT |
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 | ||
1da177e4 LT |
12 | #include <linux/types.h> |
13 | #include <linux/module.h> | |
14 | #include <linux/proc_fs.h> | |
1da177e4 LT |
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> | |
d7cd5611 | 32 | #include <linux/start_kernel.h> |
1da177e4 LT |
33 | #include <linux/security.h> |
34 | #include <linux/workqueue.h> | |
35 | #include <linux/profile.h> | |
36 | #include <linux/rcupdate.h> | |
37 | #include <linux/moduleparam.h> | |
38 | #include <linux/kallsyms.h> | |
39 | #include <linux/writeback.h> | |
40 | #include <linux/cpu.h> | |
41 | #include <linux/cpuset.h> | |
42 | #include <linux/efi.h> | |
c757249a | 43 | #include <linux/taskstats_kern.h> |
ca74e92b | 44 | #include <linux/delayacct.h> |
1da177e4 LT |
45 | #include <linux/unistd.h> |
46 | #include <linux/rmap.h> | |
47 | #include <linux/mempolicy.h> | |
48 | #include <linux/key.h> | |
4552d5dc | 49 | #include <linux/unwind.h> |
b6cd0b77 | 50 | #include <linux/buffer_head.h> |
9a11b49a | 51 | #include <linux/debug_locks.h> |
fbb9ce95 | 52 | #include <linux/lockdep.h> |
84d73786 | 53 | #include <linux/pid_namespace.h> |
1f21782e | 54 | #include <linux/device.h> |
1da177e4 LT |
55 | |
56 | #include <asm/io.h> | |
57 | #include <asm/bugs.h> | |
58 | #include <asm/setup.h> | |
a940199f | 59 | #include <asm/sections.h> |
37b73c82 | 60 | #include <asm/cacheflush.h> |
1da177e4 | 61 | |
1da177e4 LT |
62 | #ifdef CONFIG_X86_LOCAL_APIC |
63 | #include <asm/smp.h> | |
64 | #endif | |
65 | ||
66 | /* | |
69c99ac1 CQH |
67 | * This is one of the first .c files built. Error out early if we have compiler |
68 | * trouble. | |
69 | * | |
70 | * Versions of gcc older than that listed below may actually compile and link | |
71 | * okay, but the end product can have subtle run time bugs. To avoid associated | |
72 | * bogus bug reports, we flatly refuse to compile with a gcc that is known to be | |
73 | * too old from the very beginning. | |
1da177e4 | 74 | */ |
fd285bb5 | 75 | #if (__GNUC__ < 3) || (__GNUC__ == 3 && __GNUC_MINOR__ < 2) |
1da177e4 LT |
76 | #error Sorry, your GCC is too old. It builds incorrect kernels. |
77 | #endif | |
78 | ||
f1a60dbf AM |
79 | #if __GNUC__ == 4 && __GNUC_MINOR__ == 1 && __GNUC_PATCHLEVEL__ == 0 |
80 | #warning gcc-4.1.0 is known to miscompile the kernel. A different compiler version is recommended. | |
81 | #endif | |
82 | ||
1da177e4 LT |
83 | static int init(void *); |
84 | ||
85 | extern void init_IRQ(void); | |
1da177e4 LT |
86 | extern void fork_init(unsigned long); |
87 | extern void mca_init(void); | |
88 | extern void sbus_init(void); | |
89 | extern void sysctl_init(void); | |
90 | extern void signals_init(void); | |
1da177e4 LT |
91 | extern void pidhash_init(void); |
92 | extern void pidmap_init(void); | |
93 | extern void prio_tree_init(void); | |
94 | extern void radix_tree_init(void); | |
95 | extern void free_initmem(void); | |
1da177e4 LT |
96 | extern void prepare_namespace(void); |
97 | #ifdef CONFIG_ACPI | |
98 | extern void acpi_early_init(void); | |
99 | #else | |
100 | static inline void acpi_early_init(void) { } | |
101 | #endif | |
37b73c82 AV |
102 | #ifndef CONFIG_DEBUG_RODATA |
103 | static inline void mark_rodata_ro(void) { } | |
104 | #endif | |
1da177e4 LT |
105 | |
106 | #ifdef CONFIG_TC | |
107 | extern void tc_init(void); | |
108 | #endif | |
109 | ||
110 | enum system_states system_state; | |
111 | EXPORT_SYMBOL(system_state); | |
112 | ||
113 | /* | |
114 | * Boot command-line arguments | |
115 | */ | |
116 | #define MAX_INIT_ARGS CONFIG_INIT_ENV_ARG_LIMIT | |
117 | #define MAX_INIT_ENVS CONFIG_INIT_ENV_ARG_LIMIT | |
118 | ||
119 | extern void time_init(void); | |
120 | /* Default late time init is NULL. archs can override this later. */ | |
121 | void (*late_time_init)(void); | |
122 | extern void softirq_init(void); | |
123 | ||
124 | /* Untouched command line (eg. for /proc) saved by arch-specific code. */ | |
125 | char saved_command_line[COMMAND_LINE_SIZE]; | |
126 | ||
127 | static char *execute_command; | |
ffdfc409 | 128 | static char *ramdisk_execute_command; |
1da177e4 LT |
129 | |
130 | /* Setup configured maximum number of CPUs to activate */ | |
131 | static unsigned int max_cpus = NR_CPUS; | |
132 | ||
7e96287d VG |
133 | /* |
134 | * If set, this is an indication to the drivers that reset the underlying | |
135 | * device before going ahead with the initialization otherwise driver might | |
136 | * rely on the BIOS and skip the reset operation. | |
137 | * | |
138 | * This is useful if kernel is booting in an unreliable environment. | |
139 | * For ex. kdump situaiton where previous kernel has crashed, BIOS has been | |
140 | * skipped and devices will be in unknown state. | |
141 | */ | |
142 | unsigned int reset_devices; | |
143 | EXPORT_SYMBOL(reset_devices); | |
144 | ||
1da177e4 LT |
145 | /* |
146 | * Setup routine for controlling SMP activation | |
147 | * | |
148 | * Command-line option of "nosmp" or "maxcpus=0" will disable SMP | |
149 | * activation entirely (the MPS table probe still happens, though). | |
150 | * | |
151 | * Command-line option of "maxcpus=<NUM>", where <NUM> is an integer | |
152 | * greater than 0, limits the maximum number of CPUs activated in | |
153 | * SMP mode to <NUM>. | |
154 | */ | |
155 | static int __init nosmp(char *str) | |
156 | { | |
157 | max_cpus = 0; | |
158 | return 1; | |
159 | } | |
160 | ||
161 | __setup("nosmp", nosmp); | |
162 | ||
163 | static int __init maxcpus(char *str) | |
164 | { | |
165 | get_option(&str, &max_cpus); | |
166 | return 1; | |
167 | } | |
168 | ||
169 | __setup("maxcpus=", maxcpus); | |
170 | ||
7e96287d VG |
171 | static int __init set_reset_devices(char *str) |
172 | { | |
173 | reset_devices = 1; | |
174 | return 1; | |
175 | } | |
176 | ||
177 | __setup("reset_devices", set_reset_devices); | |
178 | ||
1da177e4 LT |
179 | static char * argv_init[MAX_INIT_ARGS+2] = { "init", NULL, }; |
180 | char * envp_init[MAX_INIT_ENVS+2] = { "HOME=/", "TERM=linux", NULL, }; | |
181 | static const char *panic_later, *panic_param; | |
182 | ||
183 | extern struct obs_kernel_param __setup_start[], __setup_end[]; | |
184 | ||
185 | static int __init obsolete_checksetup(char *line) | |
186 | { | |
187 | struct obs_kernel_param *p; | |
33df0d19 | 188 | int had_early_param = 0; |
1da177e4 LT |
189 | |
190 | p = __setup_start; | |
191 | do { | |
192 | int n = strlen(p->str); | |
193 | if (!strncmp(line, p->str, n)) { | |
194 | if (p->early) { | |
33df0d19 RR |
195 | /* Already done in parse_early_param? |
196 | * (Needs exact match on param part). | |
197 | * Keep iterating, as we can have early | |
198 | * params and __setups of same names 8( */ | |
1da177e4 | 199 | if (line[n] == '\0' || line[n] == '=') |
33df0d19 | 200 | had_early_param = 1; |
1da177e4 LT |
201 | } else if (!p->setup_func) { |
202 | printk(KERN_WARNING "Parameter %s is obsolete," | |
203 | " ignored\n", p->str); | |
204 | return 1; | |
205 | } else if (p->setup_func(line + n)) | |
206 | return 1; | |
207 | } | |
208 | p++; | |
209 | } while (p < __setup_end); | |
33df0d19 RR |
210 | |
211 | return had_early_param; | |
1da177e4 LT |
212 | } |
213 | ||
214 | /* | |
215 | * This should be approx 2 Bo*oMips to start (note initial shift), and will | |
216 | * still work even if initially too large, it will just take slightly longer | |
217 | */ | |
218 | unsigned long loops_per_jiffy = (1<<12); | |
219 | ||
220 | EXPORT_SYMBOL(loops_per_jiffy); | |
221 | ||
222 | static int __init debug_kernel(char *str) | |
223 | { | |
224 | if (*str) | |
225 | return 0; | |
226 | console_loglevel = 10; | |
227 | return 1; | |
228 | } | |
229 | ||
230 | static int __init quiet_kernel(char *str) | |
231 | { | |
232 | if (*str) | |
233 | return 0; | |
234 | console_loglevel = 4; | |
235 | return 1; | |
236 | } | |
237 | ||
238 | __setup("debug", debug_kernel); | |
239 | __setup("quiet", quiet_kernel); | |
240 | ||
241 | static int __init loglevel(char *str) | |
242 | { | |
243 | get_option(&str, &console_loglevel); | |
244 | return 1; | |
245 | } | |
246 | ||
247 | __setup("loglevel=", loglevel); | |
248 | ||
249 | /* | |
250 | * Unknown boot options get handed to init, unless they look like | |
251 | * failed parameters | |
252 | */ | |
253 | static int __init unknown_bootoption(char *param, char *val) | |
254 | { | |
255 | /* Change NUL term back to "=", to make "param" the whole string. */ | |
256 | if (val) { | |
257 | /* param=val or param="val"? */ | |
258 | if (val == param+strlen(param)+1) | |
259 | val[-1] = '='; | |
260 | else if (val == param+strlen(param)+2) { | |
261 | val[-2] = '='; | |
262 | memmove(val-1, val, strlen(val)+1); | |
263 | val--; | |
264 | } else | |
265 | BUG(); | |
266 | } | |
267 | ||
268 | /* Handle obsolete-style parameters */ | |
269 | if (obsolete_checksetup(param)) | |
270 | return 0; | |
271 | ||
272 | /* | |
273 | * Preemptive maintenance for "why didn't my mispelled command | |
274 | * line work?" | |
275 | */ | |
276 | if (strchr(param, '.') && (!val || strchr(param, '.') < val)) { | |
277 | printk(KERN_ERR "Unknown boot option `%s': ignoring\n", param); | |
278 | return 0; | |
279 | } | |
280 | ||
281 | if (panic_later) | |
282 | return 0; | |
283 | ||
284 | if (val) { | |
285 | /* Environment option */ | |
286 | unsigned int i; | |
287 | for (i = 0; envp_init[i]; i++) { | |
288 | if (i == MAX_INIT_ENVS) { | |
289 | panic_later = "Too many boot env vars at `%s'"; | |
290 | panic_param = param; | |
291 | } | |
292 | if (!strncmp(param, envp_init[i], val - param)) | |
293 | break; | |
294 | } | |
295 | envp_init[i] = param; | |
296 | } else { | |
297 | /* Command line option */ | |
298 | unsigned int i; | |
299 | for (i = 0; argv_init[i]; i++) { | |
300 | if (i == MAX_INIT_ARGS) { | |
301 | panic_later = "Too many boot init vars at `%s'"; | |
302 | panic_param = param; | |
303 | } | |
304 | } | |
305 | argv_init[i] = param; | |
306 | } | |
307 | return 0; | |
308 | } | |
309 | ||
310 | static int __init init_setup(char *str) | |
311 | { | |
312 | unsigned int i; | |
313 | ||
314 | execute_command = str; | |
315 | /* | |
316 | * In case LILO is going to boot us with default command line, | |
317 | * it prepends "auto" before the whole cmdline which makes | |
318 | * the shell think it should execute a script with such name. | |
319 | * So we ignore all arguments entered _before_ init=... [MJ] | |
320 | */ | |
321 | for (i = 1; i < MAX_INIT_ARGS; i++) | |
322 | argv_init[i] = NULL; | |
323 | return 1; | |
324 | } | |
325 | __setup("init=", init_setup); | |
326 | ||
ffdfc409 OJ |
327 | static int __init rdinit_setup(char *str) |
328 | { | |
329 | unsigned int i; | |
330 | ||
331 | ramdisk_execute_command = str; | |
332 | /* See "auto" comment in init_setup */ | |
333 | for (i = 1; i < MAX_INIT_ARGS; i++) | |
334 | argv_init[i] = NULL; | |
335 | return 1; | |
336 | } | |
337 | __setup("rdinit=", rdinit_setup); | |
338 | ||
1da177e4 LT |
339 | #ifndef CONFIG_SMP |
340 | ||
341 | #ifdef CONFIG_X86_LOCAL_APIC | |
342 | static void __init smp_init(void) | |
343 | { | |
344 | APIC_init_uniprocessor(); | |
345 | } | |
346 | #else | |
347 | #define smp_init() do { } while (0) | |
348 | #endif | |
349 | ||
350 | static inline void setup_per_cpu_areas(void) { } | |
351 | static inline void smp_prepare_cpus(unsigned int maxcpus) { } | |
352 | ||
353 | #else | |
354 | ||
355 | #ifdef __GENERIC_PER_CPU | |
b73b459f | 356 | unsigned long __per_cpu_offset[NR_CPUS] __read_mostly; |
1da177e4 LT |
357 | |
358 | EXPORT_SYMBOL(__per_cpu_offset); | |
359 | ||
360 | static void __init setup_per_cpu_areas(void) | |
361 | { | |
362 | unsigned long size, i; | |
363 | char *ptr; | |
63872f87 | 364 | unsigned long nr_possible_cpus = num_possible_cpus(); |
1da177e4 LT |
365 | |
366 | /* Copy section for each CPU (we discard the original) */ | |
367 | size = ALIGN(__per_cpu_end - __per_cpu_start, SMP_CACHE_BYTES); | |
368 | #ifdef CONFIG_MODULES | |
369 | if (size < PERCPU_ENOUGH_ROOM) | |
370 | size = PERCPU_ENOUGH_ROOM; | |
371 | #endif | |
63872f87 | 372 | ptr = alloc_bootmem(size * nr_possible_cpus); |
1da177e4 | 373 | |
0a945022 | 374 | for_each_possible_cpu(i) { |
1da177e4 LT |
375 | __per_cpu_offset[i] = ptr - __per_cpu_start; |
376 | memcpy(ptr, __per_cpu_start, __per_cpu_end - __per_cpu_start); | |
63872f87 | 377 | ptr += size; |
1da177e4 LT |
378 | } |
379 | } | |
380 | #endif /* !__GENERIC_PER_CPU */ | |
381 | ||
382 | /* Called by boot processor to activate the rest. */ | |
383 | static void __init smp_init(void) | |
384 | { | |
385 | unsigned int i; | |
386 | ||
387 | /* FIXME: This should be done in userspace --RR */ | |
388 | for_each_present_cpu(i) { | |
389 | if (num_online_cpus() >= max_cpus) | |
390 | break; | |
391 | if (!cpu_online(i)) | |
392 | cpu_up(i); | |
393 | } | |
394 | ||
395 | /* Any cleanup work */ | |
396 | printk(KERN_INFO "Brought up %ld CPUs\n", (long)num_online_cpus()); | |
397 | smp_cpus_done(max_cpus); | |
398 | #if 0 | |
399 | /* Get other processors into their bootup holding patterns. */ | |
400 | ||
401 | smp_commence(); | |
402 | #endif | |
403 | } | |
404 | ||
405 | #endif | |
406 | ||
407 | /* | |
408 | * We need to finalize in a non-__init function or else race conditions | |
409 | * between the root thread and the init thread may cause start_kernel to | |
410 | * be reaped by free_initmem before the root thread has proceeded to | |
411 | * cpu_idle. | |
412 | * | |
413 | * gcc-3.4 accidentally inlines this function, so use noinline. | |
414 | */ | |
415 | ||
416 | static void noinline rest_init(void) | |
417 | __releases(kernel_lock) | |
418 | { | |
419 | kernel_thread(init, NULL, CLONE_FS | CLONE_SIGHAND); | |
420 | numa_default_policy(); | |
421 | unlock_kernel(); | |
f340c0d1 IM |
422 | |
423 | /* | |
424 | * The boot idle thread must execute schedule() | |
425 | * at least one to get things moving: | |
426 | */ | |
5bfb5d69 | 427 | preempt_enable_no_resched(); |
f340c0d1 | 428 | schedule(); |
5bfb5d69 | 429 | preempt_disable(); |
f340c0d1 | 430 | |
5bfb5d69 | 431 | /* Call into cpu_idle with preempt disabled */ |
1da177e4 LT |
432 | cpu_idle(); |
433 | } | |
434 | ||
435 | /* Check for early params. */ | |
436 | static int __init do_early_param(char *param, char *val) | |
437 | { | |
438 | struct obs_kernel_param *p; | |
439 | ||
440 | for (p = __setup_start; p < __setup_end; p++) { | |
441 | if (p->early && strcmp(param, p->str) == 0) { | |
442 | if (p->setup_func(val) != 0) | |
443 | printk(KERN_WARNING | |
444 | "Malformed early option '%s'\n", param); | |
445 | } | |
446 | } | |
447 | /* We accept everything at this stage. */ | |
448 | return 0; | |
449 | } | |
450 | ||
451 | /* Arch code calls this early on, or if not, just before other parsing. */ | |
452 | void __init parse_early_param(void) | |
453 | { | |
454 | static __initdata int done = 0; | |
455 | static __initdata char tmp_cmdline[COMMAND_LINE_SIZE]; | |
456 | ||
457 | if (done) | |
458 | return; | |
459 | ||
460 | /* All fall through to do_early_param. */ | |
461 | strlcpy(tmp_cmdline, saved_command_line, COMMAND_LINE_SIZE); | |
462 | parse_args("early options", tmp_cmdline, NULL, 0, do_early_param); | |
463 | done = 1; | |
464 | } | |
465 | ||
466 | /* | |
467 | * Activate the first processor. | |
468 | */ | |
469 | ||
44fd2299 SS |
470 | static void __init boot_cpu_init(void) |
471 | { | |
472 | int cpu = smp_processor_id(); | |
473 | /* Mark the boot cpu "present", "online" etc for SMP and UP case */ | |
474 | cpu_set(cpu, cpu_online_map); | |
475 | cpu_set(cpu, cpu_present_map); | |
476 | cpu_set(cpu, cpu_possible_map); | |
477 | } | |
478 | ||
033ab7f8 AM |
479 | void __init __attribute__((weak)) smp_setup_processor_id(void) |
480 | { | |
481 | } | |
482 | ||
1da177e4 LT |
483 | asmlinkage void __init start_kernel(void) |
484 | { | |
485 | char * command_line; | |
486 | extern struct kernel_param __start___param[], __stop___param[]; | |
033ab7f8 AM |
487 | |
488 | smp_setup_processor_id(); | |
489 | ||
fbb9ce95 IM |
490 | /* |
491 | * Need to run as early as possible, to initialize the | |
492 | * lockdep hash: | |
493 | */ | |
c9538ed4 | 494 | unwind_init(); |
fbb9ce95 IM |
495 | lockdep_init(); |
496 | ||
497 | local_irq_disable(); | |
498 | early_boot_irqs_off(); | |
243c7621 | 499 | early_init_irq_lock_class(); |
fbb9ce95 | 500 | |
1da177e4 LT |
501 | /* |
502 | * Interrupts are still disabled. Do necessary setups, then | |
503 | * enable them | |
504 | */ | |
505 | lock_kernel(); | |
44fd2299 | 506 | boot_cpu_init(); |
1da177e4 LT |
507 | page_address_init(); |
508 | printk(KERN_NOTICE); | |
8993780a | 509 | printk(linux_banner); |
1da177e4 | 510 | setup_arch(&command_line); |
690a973f | 511 | unwind_setup(); |
1da177e4 | 512 | setup_per_cpu_areas(); |
44fd2299 | 513 | smp_prepare_boot_cpu(); /* arch-specific boot-cpu hooks */ |
1da177e4 LT |
514 | |
515 | /* | |
516 | * Set up the scheduler prior starting any interrupts (such as the | |
517 | * timer interrupt). Full topology setup happens at smp_init() | |
518 | * time - but meanwhile we still have a functioning scheduler. | |
519 | */ | |
520 | sched_init(); | |
521 | /* | |
522 | * Disable preemption - early bootup scheduling is extremely | |
523 | * fragile until we cpu_idle() for the first time. | |
524 | */ | |
525 | preempt_disable(); | |
526 | build_all_zonelists(); | |
527 | page_alloc_init(); | |
528 | printk(KERN_NOTICE "Kernel command line: %s\n", saved_command_line); | |
529 | parse_early_param(); | |
530 | parse_args("Booting kernel", command_line, __start___param, | |
531 | __stop___param - __start___param, | |
532 | &unknown_bootoption); | |
c4a68306 AB |
533 | if (!irqs_disabled()) { |
534 | printk(KERN_WARNING "start_kernel(): bug: interrupts were " | |
535 | "enabled *very* early, fixing it\n"); | |
536 | local_irq_disable(); | |
537 | } | |
1da177e4 LT |
538 | sort_main_extable(); |
539 | trap_init(); | |
540 | rcu_init(); | |
541 | init_IRQ(); | |
542 | pidhash_init(); | |
543 | init_timers(); | |
c0a31329 | 544 | hrtimers_init(); |
1da177e4 | 545 | softirq_init(); |
ad596171 | 546 | timekeeping_init(); |
88fecaa2 | 547 | time_init(); |
93e02814 HC |
548 | profile_init(); |
549 | if (!irqs_disabled()) | |
550 | printk("start_kernel(): bug: interrupts were enabled early\n"); | |
fbb9ce95 | 551 | early_boot_irqs_on(); |
93e02814 | 552 | local_irq_enable(); |
1da177e4 LT |
553 | |
554 | /* | |
555 | * HACK ALERT! This is early. We're enabling the console before | |
556 | * we've done PCI setups etc, and console_init() must be aware of | |
557 | * this. But we do want output early, in case something goes wrong. | |
558 | */ | |
559 | console_init(); | |
560 | if (panic_later) | |
561 | panic(panic_later, panic_param); | |
fbb9ce95 IM |
562 | |
563 | lockdep_info(); | |
564 | ||
9a11b49a IM |
565 | /* |
566 | * Need to run this when irqs are enabled, because it wants | |
567 | * to self-test [hard/soft]-irqs on/off lock inversion bugs | |
568 | * too: | |
569 | */ | |
570 | locking_selftest(); | |
571 | ||
1da177e4 LT |
572 | #ifdef CONFIG_BLK_DEV_INITRD |
573 | if (initrd_start && !initrd_below_start_ok && | |
574 | initrd_start < min_low_pfn << PAGE_SHIFT) { | |
575 | printk(KERN_CRIT "initrd overwritten (0x%08lx < 0x%08lx) - " | |
576 | "disabling it.\n",initrd_start,min_low_pfn << PAGE_SHIFT); | |
577 | initrd_start = 0; | |
578 | } | |
579 | #endif | |
580 | vfs_caches_init_early(); | |
c417f024 | 581 | cpuset_init_early(); |
1da177e4 LT |
582 | mem_init(); |
583 | kmem_cache_init(); | |
e7c8d5c9 | 584 | setup_per_cpu_pageset(); |
1da177e4 LT |
585 | numa_policy_init(); |
586 | if (late_time_init) | |
587 | late_time_init(); | |
588 | calibrate_delay(); | |
589 | pidmap_init(); | |
590 | pgtable_cache_init(); | |
591 | prio_tree_init(); | |
592 | anon_vma_init(); | |
593 | #ifdef CONFIG_X86 | |
594 | if (efi_enabled) | |
595 | efi_enter_virtual_mode(); | |
596 | #endif | |
597 | fork_init(num_physpages); | |
598 | proc_caches_init(); | |
599 | buffer_init(); | |
600 | unnamed_dev_init(); | |
601 | key_init(); | |
602 | security_init(); | |
603 | vfs_caches_init(num_physpages); | |
604 | radix_tree_init(); | |
605 | signals_init(); | |
606 | /* rootfs populating might need page-writeback */ | |
607 | page_writeback_init(); | |
608 | #ifdef CONFIG_PROC_FS | |
609 | proc_root_init(); | |
610 | #endif | |
611 | cpuset_init(); | |
c757249a | 612 | taskstats_init_early(); |
ca74e92b | 613 | delayacct_init(); |
1da177e4 LT |
614 | |
615 | check_bugs(); | |
616 | ||
617 | acpi_early_init(); /* before LAPIC and SMP init */ | |
618 | ||
619 | /* Do the rest non-__init'ed, we're now alive */ | |
620 | rest_init(); | |
621 | } | |
622 | ||
623 | static int __initdata initcall_debug; | |
624 | ||
625 | static int __init initcall_debug_setup(char *str) | |
626 | { | |
627 | initcall_debug = 1; | |
628 | return 1; | |
629 | } | |
630 | __setup("initcall_debug", initcall_debug_setup); | |
631 | ||
1da177e4 LT |
632 | extern initcall_t __initcall_start[], __initcall_end[]; |
633 | ||
634 | static void __init do_initcalls(void) | |
635 | { | |
636 | initcall_t *call; | |
637 | int count = preempt_count(); | |
638 | ||
639 | for (call = __initcall_start; call < __initcall_end; call++) { | |
c1cda48a AM |
640 | char *msg = NULL; |
641 | char msgbuf[40]; | |
642 | int result; | |
1da177e4 LT |
643 | |
644 | if (initcall_debug) { | |
c1cda48a AM |
645 | printk("Calling initcall 0x%p", *call); |
646 | print_fn_descriptor_symbol(": %s()", | |
647 | (unsigned long) *call); | |
1da177e4 LT |
648 | printk("\n"); |
649 | } | |
650 | ||
c1cda48a | 651 | result = (*call)(); |
1da177e4 | 652 | |
f3a19cb4 | 653 | if (result && result != -ENODEV && initcall_debug) { |
c1cda48a AM |
654 | sprintf(msgbuf, "error code %d", result); |
655 | msg = msgbuf; | |
656 | } | |
1da177e4 LT |
657 | if (preempt_count() != count) { |
658 | msg = "preemption imbalance"; | |
659 | preempt_count() = count; | |
660 | } | |
661 | if (irqs_disabled()) { | |
662 | msg = "disabled interrupts"; | |
663 | local_irq_enable(); | |
664 | } | |
665 | if (msg) { | |
c1cda48a AM |
666 | printk(KERN_WARNING "initcall at 0x%p", *call); |
667 | print_fn_descriptor_symbol(": %s()", | |
668 | (unsigned long) *call); | |
669 | printk(": returned with %s\n", msg); | |
1da177e4 LT |
670 | } |
671 | } | |
672 | ||
673 | /* Make sure there is no pending stuff from the initcall sequence */ | |
674 | flush_scheduled_work(); | |
675 | } | |
676 | ||
677 | /* | |
678 | * Ok, the machine is now initialized. None of the devices | |
679 | * have been touched yet, but the CPU subsystem is up and | |
680 | * running, and memory and process management works. | |
681 | * | |
682 | * Now we can finally start doing some real work.. | |
683 | */ | |
684 | static void __init do_basic_setup(void) | |
685 | { | |
686 | /* drivers will send hotplug events */ | |
687 | init_workqueues(); | |
688 | usermodehelper_init(); | |
689 | driver_init(); | |
690 | ||
691 | #ifdef CONFIG_SYSCTL | |
692 | sysctl_init(); | |
693 | #endif | |
694 | ||
1da177e4 LT |
695 | do_initcalls(); |
696 | } | |
697 | ||
698 | static void do_pre_smp_initcalls(void) | |
699 | { | |
700 | extern int spawn_ksoftirqd(void); | |
701 | #ifdef CONFIG_SMP | |
702 | extern int migration_init(void); | |
703 | ||
704 | migration_init(); | |
705 | #endif | |
706 | spawn_ksoftirqd(); | |
8446f1d3 | 707 | spawn_softlockup_task(); |
1da177e4 LT |
708 | } |
709 | ||
710 | static void run_init_process(char *init_filename) | |
711 | { | |
712 | argv_init[0] = init_filename; | |
67608567 | 713 | kernel_execve(init_filename, argv_init, envp_init); |
1da177e4 LT |
714 | } |
715 | ||
1da177e4 LT |
716 | static int init(void * unused) |
717 | { | |
718 | lock_kernel(); | |
719 | /* | |
720 | * init can run on any cpu. | |
721 | */ | |
722 | set_cpus_allowed(current, CPU_MASK_ALL); | |
723 | /* | |
724 | * Tell the world that we're going to be the grim | |
725 | * reaper of innocent orphaned children. | |
726 | * | |
727 | * We don't want people to have to make incorrect | |
728 | * assumptions about where in the task array this | |
729 | * can be found. | |
730 | */ | |
84d73786 | 731 | init_pid_ns.child_reaper = current; |
1da177e4 | 732 | |
9ec52099 CLG |
733 | cad_pid = task_pid(current); |
734 | ||
1da177e4 LT |
735 | smp_prepare_cpus(max_cpus); |
736 | ||
737 | do_pre_smp_initcalls(); | |
738 | ||
1da177e4 LT |
739 | smp_init(); |
740 | sched_init_smp(); | |
741 | ||
742 | cpuset_init_smp(); | |
743 | ||
1da177e4 LT |
744 | do_basic_setup(); |
745 | ||
746 | /* | |
747 | * check if there is an early userspace init. If yes, let it do all | |
748 | * the work | |
749 | */ | |
ffdfc409 OJ |
750 | |
751 | if (!ramdisk_execute_command) | |
752 | ramdisk_execute_command = "/init"; | |
753 | ||
754 | if (sys_access((const char __user *) ramdisk_execute_command, 0) != 0) { | |
755 | ramdisk_execute_command = NULL; | |
1da177e4 | 756 | prepare_namespace(); |
ffdfc409 | 757 | } |
1da177e4 LT |
758 | |
759 | /* | |
760 | * Ok, we have completed the initial bootup, and | |
761 | * we're essentially up and running. Get rid of the | |
762 | * initmem segments and start the user-mode stuff.. | |
763 | */ | |
764 | free_initmem(); | |
765 | unlock_kernel(); | |
37b73c82 | 766 | mark_rodata_ro(); |
1da177e4 LT |
767 | system_state = SYSTEM_RUNNING; |
768 | numa_default_policy(); | |
769 | ||
770 | if (sys_open((const char __user *) "/dev/console", O_RDWR, 0) < 0) | |
771 | printk(KERN_WARNING "Warning: unable to open an initial console.\n"); | |
772 | ||
773 | (void) sys_dup(0); | |
774 | (void) sys_dup(0); | |
ffdfc409 OJ |
775 | |
776 | if (ramdisk_execute_command) { | |
777 | run_init_process(ramdisk_execute_command); | |
778 | printk(KERN_WARNING "Failed to execute %s\n", | |
779 | ramdisk_execute_command); | |
780 | } | |
781 | ||
1da177e4 LT |
782 | /* |
783 | * We try each of these until one succeeds. | |
784 | * | |
785 | * The Bourne shell can be used instead of init if we are | |
786 | * trying to recover a really broken machine. | |
787 | */ | |
c1d7ef70 | 788 | if (execute_command) { |
1da177e4 | 789 | run_init_process(execute_command); |
c1d7ef70 BA |
790 | printk(KERN_WARNING "Failed to execute %s. Attempting " |
791 | "defaults...\n", execute_command); | |
792 | } | |
1da177e4 LT |
793 | run_init_process("/sbin/init"); |
794 | run_init_process("/etc/init"); | |
795 | run_init_process("/bin/init"); | |
796 | run_init_process("/bin/sh"); | |
797 | ||
798 | panic("No init found. Try passing init= option to kernel."); | |
799 | } |