Contents of /alx-src/tags/kernel26-2.6.12-alx-r9/init/main.c
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Wed Mar 4 11:03:09 2009 UTC (15 years, 2 months ago) by niro
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Wed Mar 4 11:03:09 2009 UTC (15 years, 2 months ago) by niro
File MIME type: text/plain
File size: 16745 byte(s)
Tag kernel26-2.6.12-alx-r9
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 | |
14 | #include <linux/config.h> |
15 | #include <linux/types.h> |
16 | #include <linux/module.h> |
17 | #include <linux/proc_fs.h> |
18 | #include <linux/devfs_fs_kernel.h> |
19 | #include <linux/kernel.h> |
20 | #include <linux/syscalls.h> |
21 | #include <linux/string.h> |
22 | #include <linux/ctype.h> |
23 | #include <linux/delay.h> |
24 | #include <linux/utsname.h> |
25 | #include <linux/ioport.h> |
26 | #include <linux/init.h> |
27 | #include <linux/smp_lock.h> |
28 | #include <linux/initrd.h> |
29 | #include <linux/hdreg.h> |
30 | #include <linux/bootmem.h> |
31 | #include <linux/tty.h> |
32 | #include <linux/gfp.h> |
33 | #include <linux/percpu.h> |
34 | #include <linux/kmod.h> |
35 | #include <linux/kernel_stat.h> |
36 | #include <linux/security.h> |
37 | #include <linux/workqueue.h> |
38 | #include <linux/profile.h> |
39 | #include <linux/rcupdate.h> |
40 | #include <linux/moduleparam.h> |
41 | #include <linux/kallsyms.h> |
42 | #include <linux/writeback.h> |
43 | #include <linux/cpu.h> |
44 | #include <linux/cpuset.h> |
45 | #include <linux/efi.h> |
46 | #include <linux/unistd.h> |
47 | #include <linux/rmap.h> |
48 | #include <linux/mempolicy.h> |
49 | #include <linux/key.h> |
50 | |
51 | #include <asm/io.h> |
52 | #include <asm/bugs.h> |
53 | #include <asm/setup.h> |
54 | |
55 | /* |
56 | * This is one of the first .c files built. Error out early |
57 | * if we have compiler trouble.. |
58 | */ |
59 | #if __GNUC__ == 2 && __GNUC_MINOR__ == 96 |
60 | #ifdef CONFIG_FRAME_POINTER |
61 | #error This compiler cannot compile correctly with frame pointers enabled |
62 | #endif |
63 | #endif |
64 | |
65 | #ifdef CONFIG_X86_LOCAL_APIC |
66 | #include <asm/smp.h> |
67 | #endif |
68 | |
69 | /* |
70 | * Versions of gcc older than that listed below may actually compile |
71 | * and link okay, but the end product can have subtle run time bugs. |
72 | * To avoid associated bogus bug reports, we flatly refuse to compile |
73 | * with a gcc that is known to be too old from the very beginning. |
74 | */ |
75 | #if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 95) |
76 | #error Sorry, your GCC is too old. It builds incorrect kernels. |
77 | #endif |
78 | |
79 | static int init(void *); |
80 | |
81 | extern void init_IRQ(void); |
82 | extern void sock_init(void); |
83 | extern void fork_init(unsigned long); |
84 | extern void mca_init(void); |
85 | extern void sbus_init(void); |
86 | extern void sysctl_init(void); |
87 | extern void signals_init(void); |
88 | extern void buffer_init(void); |
89 | extern void pidhash_init(void); |
90 | extern void pidmap_init(void); |
91 | extern void prio_tree_init(void); |
92 | extern void radix_tree_init(void); |
93 | extern void free_initmem(void); |
94 | extern void populate_rootfs(void); |
95 | extern void driver_init(void); |
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 |
102 | |
103 | #ifdef CONFIG_TC |
104 | extern void tc_init(void); |
105 | #endif |
106 | |
107 | enum system_states system_state; |
108 | EXPORT_SYMBOL(system_state); |
109 | |
110 | /* |
111 | * Boot command-line arguments |
112 | */ |
113 | #define MAX_INIT_ARGS CONFIG_INIT_ENV_ARG_LIMIT |
114 | #define MAX_INIT_ENVS CONFIG_INIT_ENV_ARG_LIMIT |
115 | |
116 | extern void time_init(void); |
117 | /* Default late time init is NULL. archs can override this later. */ |
118 | void (*late_time_init)(void); |
119 | extern void softirq_init(void); |
120 | |
121 | /* Untouched command line (eg. for /proc) saved by arch-specific code. */ |
122 | char saved_command_line[COMMAND_LINE_SIZE]; |
123 | |
124 | static char *execute_command; |
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 | |
299 | extern void setup_arch(char **); |
300 | |
301 | #ifndef CONFIG_SMP |
302 | |
303 | #ifdef CONFIG_X86_LOCAL_APIC |
304 | static void __init smp_init(void) |
305 | { |
306 | APIC_init_uniprocessor(); |
307 | } |
308 | #else |
309 | #define smp_init() do { } while (0) |
310 | #endif |
311 | |
312 | static inline void setup_per_cpu_areas(void) { } |
313 | static inline void smp_prepare_cpus(unsigned int maxcpus) { } |
314 | |
315 | #else |
316 | |
317 | #ifdef __GENERIC_PER_CPU |
318 | unsigned long __per_cpu_offset[NR_CPUS]; |
319 | |
320 | EXPORT_SYMBOL(__per_cpu_offset); |
321 | |
322 | static void __init setup_per_cpu_areas(void) |
323 | { |
324 | unsigned long size, i; |
325 | char *ptr; |
326 | /* Created by linker magic */ |
327 | extern char __per_cpu_start[], __per_cpu_end[]; |
328 | |
329 | /* Copy section for each CPU (we discard the original) */ |
330 | size = ALIGN(__per_cpu_end - __per_cpu_start, SMP_CACHE_BYTES); |
331 | #ifdef CONFIG_MODULES |
332 | if (size < PERCPU_ENOUGH_ROOM) |
333 | size = PERCPU_ENOUGH_ROOM; |
334 | #endif |
335 | |
336 | ptr = alloc_bootmem(size * NR_CPUS); |
337 | |
338 | for (i = 0; i < NR_CPUS; i++, ptr += size) { |
339 | __per_cpu_offset[i] = ptr - __per_cpu_start; |
340 | memcpy(ptr, __per_cpu_start, __per_cpu_end - __per_cpu_start); |
341 | } |
342 | } |
343 | #endif /* !__GENERIC_PER_CPU */ |
344 | |
345 | /* Called by boot processor to activate the rest. */ |
346 | static void __init smp_init(void) |
347 | { |
348 | unsigned int i; |
349 | |
350 | /* FIXME: This should be done in userspace --RR */ |
351 | for_each_present_cpu(i) { |
352 | if (num_online_cpus() >= max_cpus) |
353 | break; |
354 | if (!cpu_online(i)) |
355 | cpu_up(i); |
356 | } |
357 | |
358 | /* Any cleanup work */ |
359 | printk(KERN_INFO "Brought up %ld CPUs\n", (long)num_online_cpus()); |
360 | smp_cpus_done(max_cpus); |
361 | #if 0 |
362 | /* Get other processors into their bootup holding patterns. */ |
363 | |
364 | smp_commence(); |
365 | #endif |
366 | } |
367 | |
368 | #endif |
369 | |
370 | /* |
371 | * We need to finalize in a non-__init function or else race conditions |
372 | * between the root thread and the init thread may cause start_kernel to |
373 | * be reaped by free_initmem before the root thread has proceeded to |
374 | * cpu_idle. |
375 | * |
376 | * gcc-3.4 accidentally inlines this function, so use noinline. |
377 | */ |
378 | |
379 | static void noinline rest_init(void) |
380 | __releases(kernel_lock) |
381 | { |
382 | kernel_thread(init, NULL, CLONE_FS | CLONE_SIGHAND); |
383 | numa_default_policy(); |
384 | unlock_kernel(); |
385 | preempt_enable_no_resched(); |
386 | cpu_idle(); |
387 | } |
388 | |
389 | /* Check for early params. */ |
390 | static int __init do_early_param(char *param, char *val) |
391 | { |
392 | struct obs_kernel_param *p; |
393 | |
394 | for (p = __setup_start; p < __setup_end; p++) { |
395 | if (p->early && strcmp(param, p->str) == 0) { |
396 | if (p->setup_func(val) != 0) |
397 | printk(KERN_WARNING |
398 | "Malformed early option '%s'\n", param); |
399 | } |
400 | } |
401 | /* We accept everything at this stage. */ |
402 | return 0; |
403 | } |
404 | |
405 | /* Arch code calls this early on, or if not, just before other parsing. */ |
406 | void __init parse_early_param(void) |
407 | { |
408 | static __initdata int done = 0; |
409 | static __initdata char tmp_cmdline[COMMAND_LINE_SIZE]; |
410 | |
411 | if (done) |
412 | return; |
413 | |
414 | /* All fall through to do_early_param. */ |
415 | strlcpy(tmp_cmdline, saved_command_line, COMMAND_LINE_SIZE); |
416 | parse_args("early options", tmp_cmdline, NULL, 0, do_early_param); |
417 | done = 1; |
418 | } |
419 | |
420 | /* |
421 | * Activate the first processor. |
422 | */ |
423 | |
424 | asmlinkage void __init start_kernel(void) |
425 | { |
426 | char * command_line; |
427 | extern struct kernel_param __start___param[], __stop___param[]; |
428 | /* |
429 | * Interrupts are still disabled. Do necessary setups, then |
430 | * enable them |
431 | */ |
432 | lock_kernel(); |
433 | page_address_init(); |
434 | printk(KERN_NOTICE); |
435 | printk(linux_banner); |
436 | setup_arch(&command_line); |
437 | setup_per_cpu_areas(); |
438 | |
439 | /* |
440 | * Mark the boot cpu "online" so that it can call console drivers in |
441 | * printk() and can access its per-cpu storage. |
442 | */ |
443 | smp_prepare_boot_cpu(); |
444 | |
445 | /* |
446 | * Set up the scheduler prior starting any interrupts (such as the |
447 | * timer interrupt). Full topology setup happens at smp_init() |
448 | * time - but meanwhile we still have a functioning scheduler. |
449 | */ |
450 | sched_init(); |
451 | /* |
452 | * Disable preemption - early bootup scheduling is extremely |
453 | * fragile until we cpu_idle() for the first time. |
454 | */ |
455 | preempt_disable(); |
456 | build_all_zonelists(); |
457 | page_alloc_init(); |
458 | printk(KERN_NOTICE "Kernel command line: %s\n", saved_command_line); |
459 | parse_early_param(); |
460 | parse_args("Booting kernel", command_line, __start___param, |
461 | __stop___param - __start___param, |
462 | &unknown_bootoption); |
463 | sort_main_extable(); |
464 | trap_init(); |
465 | rcu_init(); |
466 | init_IRQ(); |
467 | pidhash_init(); |
468 | init_timers(); |
469 | softirq_init(); |
470 | time_init(); |
471 | |
472 | /* |
473 | * HACK ALERT! This is early. We're enabling the console before |
474 | * we've done PCI setups etc, and console_init() must be aware of |
475 | * this. But we do want output early, in case something goes wrong. |
476 | */ |
477 | console_init(); |
478 | if (panic_later) |
479 | panic(panic_later, panic_param); |
480 | profile_init(); |
481 | local_irq_enable(); |
482 | #ifdef CONFIG_BLK_DEV_INITRD |
483 | if (initrd_start && !initrd_below_start_ok && |
484 | initrd_start < min_low_pfn << PAGE_SHIFT) { |
485 | printk(KERN_CRIT "initrd overwritten (0x%08lx < 0x%08lx) - " |
486 | "disabling it.\n",initrd_start,min_low_pfn << PAGE_SHIFT); |
487 | initrd_start = 0; |
488 | } |
489 | #endif |
490 | vfs_caches_init_early(); |
491 | mem_init(); |
492 | kmem_cache_init(); |
493 | numa_policy_init(); |
494 | if (late_time_init) |
495 | late_time_init(); |
496 | calibrate_delay(); |
497 | pidmap_init(); |
498 | pgtable_cache_init(); |
499 | prio_tree_init(); |
500 | anon_vma_init(); |
501 | #ifdef CONFIG_X86 |
502 | if (efi_enabled) |
503 | efi_enter_virtual_mode(); |
504 | #endif |
505 | fork_init(num_physpages); |
506 | proc_caches_init(); |
507 | buffer_init(); |
508 | unnamed_dev_init(); |
509 | key_init(); |
510 | security_init(); |
511 | vfs_caches_init(num_physpages); |
512 | radix_tree_init(); |
513 | signals_init(); |
514 | /* rootfs populating might need page-writeback */ |
515 | page_writeback_init(); |
516 | #ifdef CONFIG_PROC_FS |
517 | proc_root_init(); |
518 | #endif |
519 | cpuset_init(); |
520 | |
521 | check_bugs(); |
522 | |
523 | acpi_early_init(); /* before LAPIC and SMP init */ |
524 | |
525 | /* Do the rest non-__init'ed, we're now alive */ |
526 | rest_init(); |
527 | } |
528 | |
529 | static int __initdata initcall_debug; |
530 | |
531 | static int __init initcall_debug_setup(char *str) |
532 | { |
533 | initcall_debug = 1; |
534 | return 1; |
535 | } |
536 | __setup("initcall_debug", initcall_debug_setup); |
537 | |
538 | struct task_struct *child_reaper = &init_task; |
539 | |
540 | extern initcall_t __initcall_start[], __initcall_end[]; |
541 | |
542 | static void __init do_initcalls(void) |
543 | { |
544 | initcall_t *call; |
545 | int count = preempt_count(); |
546 | |
547 | for (call = __initcall_start; call < __initcall_end; call++) { |
548 | char *msg; |
549 | |
550 | if (initcall_debug) { |
551 | printk(KERN_DEBUG "Calling initcall 0x%p", *call); |
552 | print_fn_descriptor_symbol(": %s()", (unsigned long) *call); |
553 | printk("\n"); |
554 | } |
555 | |
556 | (*call)(); |
557 | |
558 | msg = NULL; |
559 | if (preempt_count() != count) { |
560 | msg = "preemption imbalance"; |
561 | preempt_count() = count; |
562 | } |
563 | if (irqs_disabled()) { |
564 | msg = "disabled interrupts"; |
565 | local_irq_enable(); |
566 | } |
567 | if (msg) { |
568 | printk(KERN_WARNING "error in initcall at 0x%p: " |
569 | "returned with %s\n", *call, msg); |
570 | } |
571 | } |
572 | |
573 | /* Make sure there is no pending stuff from the initcall sequence */ |
574 | flush_scheduled_work(); |
575 | } |
576 | |
577 | /* |
578 | * Ok, the machine is now initialized. None of the devices |
579 | * have been touched yet, but the CPU subsystem is up and |
580 | * running, and memory and process management works. |
581 | * |
582 | * Now we can finally start doing some real work.. |
583 | */ |
584 | static void __init do_basic_setup(void) |
585 | { |
586 | /* drivers will send hotplug events */ |
587 | init_workqueues(); |
588 | usermodehelper_init(); |
589 | driver_init(); |
590 | |
591 | #ifdef CONFIG_SYSCTL |
592 | sysctl_init(); |
593 | #endif |
594 | |
595 | /* Networking initialization needs a process context */ |
596 | sock_init(); |
597 | |
598 | do_initcalls(); |
599 | } |
600 | |
601 | static void do_pre_smp_initcalls(void) |
602 | { |
603 | extern int spawn_ksoftirqd(void); |
604 | #ifdef CONFIG_SMP |
605 | extern int migration_init(void); |
606 | |
607 | migration_init(); |
608 | #endif |
609 | spawn_ksoftirqd(); |
610 | } |
611 | |
612 | static void run_init_process(char *init_filename) |
613 | { |
614 | argv_init[0] = init_filename; |
615 | execve(init_filename, argv_init, envp_init); |
616 | } |
617 | |
618 | static inline void fixup_cpu_present_map(void) |
619 | { |
620 | #ifdef CONFIG_SMP |
621 | int i; |
622 | |
623 | /* |
624 | * If arch is not hotplug ready and did not populate |
625 | * cpu_present_map, just make cpu_present_map same as cpu_possible_map |
626 | * for other cpu bringup code to function as normal. e.g smp_init() etc. |
627 | */ |
628 | if (cpus_empty(cpu_present_map)) { |
629 | for_each_cpu(i) { |
630 | cpu_set(i, cpu_present_map); |
631 | } |
632 | } |
633 | #endif |
634 | } |
635 | |
636 | static int init(void * unused) |
637 | { |
638 | lock_kernel(); |
639 | /* |
640 | * init can run on any cpu. |
641 | */ |
642 | set_cpus_allowed(current, CPU_MASK_ALL); |
643 | /* |
644 | * Tell the world that we're going to be the grim |
645 | * reaper of innocent orphaned children. |
646 | * |
647 | * We don't want people to have to make incorrect |
648 | * assumptions about where in the task array this |
649 | * can be found. |
650 | */ |
651 | child_reaper = current; |
652 | |
653 | /* Sets up cpus_possible() */ |
654 | smp_prepare_cpus(max_cpus); |
655 | |
656 | do_pre_smp_initcalls(); |
657 | |
658 | fixup_cpu_present_map(); |
659 | smp_init(); |
660 | sched_init_smp(); |
661 | |
662 | cpuset_init_smp(); |
663 | |
664 | /* |
665 | * Do this before initcalls, because some drivers want to access |
666 | * firmware files. |
667 | */ |
668 | populate_rootfs(); |
669 | |
670 | do_basic_setup(); |
671 | |
672 | /* |
673 | * check if there is an early userspace init. If yes, let it do all |
674 | * the work |
675 | */ |
676 | if (sys_access((const char __user *) "/init", 0) == 0) |
677 | execute_command = "/init"; |
678 | else |
679 | prepare_namespace(); |
680 | |
681 | /* |
682 | * Ok, we have completed the initial bootup, and |
683 | * we're essentially up and running. Get rid of the |
684 | * initmem segments and start the user-mode stuff.. |
685 | */ |
686 | free_initmem(); |
687 | unlock_kernel(); |
688 | system_state = SYSTEM_RUNNING; |
689 | numa_default_policy(); |
690 | |
691 | if (sys_open((const char __user *) "/dev/console", O_RDWR, 0) < 0) |
692 | printk(KERN_WARNING "Warning: unable to open an initial console.\n"); |
693 | |
694 | (void) sys_dup(0); |
695 | (void) sys_dup(0); |
696 | |
697 | /* |
698 | * We try each of these until one succeeds. |
699 | * |
700 | * The Bourne shell can be used instead of init if we are |
701 | * trying to recover a really broken machine. |
702 | */ |
703 | |
704 | if (execute_command) |
705 | run_init_process(execute_command); |
706 | |
707 | run_init_process("/sbin/init"); |
708 | run_init_process("/etc/init"); |
709 | run_init_process("/bin/init"); |
710 | run_init_process("/bin/sh"); |
711 | |
712 | panic("No init found. Try passing init= option to kernel."); |
713 | } |