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