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