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 | ||
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> | |
ddbcc7e8 | 42 | #include <linux/cgroup.h> |
1da177e4 | 43 | #include <linux/efi.h> |
906568c9 | 44 | #include <linux/tick.h> |
6168a702 | 45 | #include <linux/interrupt.h> |
c757249a | 46 | #include <linux/taskstats_kern.h> |
ca74e92b | 47 | #include <linux/delayacct.h> |
1da177e4 LT |
48 | #include <linux/unistd.h> |
49 | #include <linux/rmap.h> | |
50 | #include <linux/mempolicy.h> | |
51 | #include <linux/key.h> | |
4552d5dc | 52 | #include <linux/unwind.h> |
b6cd0b77 | 53 | #include <linux/buffer_head.h> |
9a11b49a | 54 | #include <linux/debug_locks.h> |
fbb9ce95 | 55 | #include <linux/lockdep.h> |
84d73786 | 56 | #include <linux/pid_namespace.h> |
1f21782e | 57 | #include <linux/device.h> |
73c27992 | 58 | #include <linux/kthread.h> |
1da177e4 LT |
59 | |
60 | #include <asm/io.h> | |
61 | #include <asm/bugs.h> | |
62 | #include <asm/setup.h> | |
a940199f | 63 | #include <asm/sections.h> |
37b73c82 | 64 | #include <asm/cacheflush.h> |
1da177e4 | 65 | |
1da177e4 LT |
66 | #ifdef CONFIG_X86_LOCAL_APIC |
67 | #include <asm/smp.h> | |
68 | #endif | |
69 | ||
70 | /* | |
69c99ac1 CQH |
71 | * This is one of the first .c files built. Error out early if we have compiler |
72 | * trouble. | |
73 | * | |
74 | * Versions of gcc older than that listed below may actually compile and link | |
75 | * okay, but the end product can have subtle run time bugs. To avoid associated | |
76 | * bogus bug reports, we flatly refuse to compile with a gcc that is known to be | |
77 | * too old from the very beginning. | |
1da177e4 | 78 | */ |
fd285bb5 | 79 | #if (__GNUC__ < 3) || (__GNUC__ == 3 && __GNUC_MINOR__ < 2) |
1da177e4 LT |
80 | #error Sorry, your GCC is too old. It builds incorrect kernels. |
81 | #endif | |
82 | ||
f1a60dbf AM |
83 | #if __GNUC__ == 4 && __GNUC_MINOR__ == 1 && __GNUC_PATCHLEVEL__ == 0 |
84 | #warning gcc-4.1.0 is known to miscompile the kernel. A different compiler version is recommended. | |
85 | #endif | |
86 | ||
aae5f662 | 87 | static int kernel_init(void *); |
1da177e4 LT |
88 | |
89 | extern void init_IRQ(void); | |
1da177e4 LT |
90 | extern void fork_init(unsigned long); |
91 | extern void mca_init(void); | |
92 | extern void sbus_init(void); | |
1da177e4 | 93 | extern void signals_init(void); |
1da177e4 LT |
94 | extern void pidhash_init(void); |
95 | extern void pidmap_init(void); | |
96 | extern void prio_tree_init(void); | |
97 | extern void radix_tree_init(void); | |
98 | extern void free_initmem(void); | |
1da177e4 LT |
99 | #ifdef CONFIG_ACPI |
100 | extern void acpi_early_init(void); | |
101 | #else | |
102 | static inline void acpi_early_init(void) { } | |
103 | #endif | |
37b73c82 AV |
104 | #ifndef CONFIG_DEBUG_RODATA |
105 | static inline void mark_rodata_ro(void) { } | |
106 | #endif | |
1da177e4 LT |
107 | |
108 | #ifdef CONFIG_TC | |
109 | extern void tc_init(void); | |
110 | #endif | |
111 | ||
112 | enum system_states system_state; | |
113 | EXPORT_SYMBOL(system_state); | |
114 | ||
115 | /* | |
116 | * Boot command-line arguments | |
117 | */ | |
118 | #define MAX_INIT_ARGS CONFIG_INIT_ENV_ARG_LIMIT | |
119 | #define MAX_INIT_ENVS CONFIG_INIT_ENV_ARG_LIMIT | |
120 | ||
121 | extern void time_init(void); | |
122 | /* Default late time init is NULL. archs can override this later. */ | |
123 | void (*late_time_init)(void); | |
124 | extern void softirq_init(void); | |
125 | ||
30d7e0d4 ABL |
126 | /* Untouched command line saved by arch-specific code. */ |
127 | char __initdata boot_command_line[COMMAND_LINE_SIZE]; | |
128 | /* Untouched saved command line (eg. for /proc) */ | |
129 | char *saved_command_line; | |
130 | /* Command line for parameter parsing */ | |
131 | static char *static_command_line; | |
1da177e4 LT |
132 | |
133 | static char *execute_command; | |
ffdfc409 | 134 | static char *ramdisk_execute_command; |
1da177e4 | 135 | |
8b3b2955 | 136 | #ifdef CONFIG_SMP |
1da177e4 | 137 | /* Setup configured maximum number of CPUs to activate */ |
8b3b2955 | 138 | static unsigned int __initdata max_cpus = NR_CPUS; |
7e96287d | 139 | |
1da177e4 LT |
140 | /* |
141 | * Setup routine for controlling SMP activation | |
142 | * | |
143 | * Command-line option of "nosmp" or "maxcpus=0" will disable SMP | |
144 | * activation entirely (the MPS table probe still happens, though). | |
145 | * | |
146 | * Command-line option of "maxcpus=<NUM>", where <NUM> is an integer | |
147 | * greater than 0, limits the maximum number of CPUs activated in | |
148 | * SMP mode to <NUM>. | |
149 | */ | |
61ec7567 LB |
150 | #ifndef CONFIG_X86_IO_APIC |
151 | static inline void disable_ioapic_setup(void) {}; | |
152 | #endif | |
153 | ||
1da177e4 LT |
154 | static int __init nosmp(char *str) |
155 | { | |
156 | max_cpus = 0; | |
61ec7567 | 157 | disable_ioapic_setup(); |
8b3b2955 | 158 | return 0; |
1da177e4 LT |
159 | } |
160 | ||
8b3b2955 | 161 | early_param("nosmp", nosmp); |
1da177e4 LT |
162 | |
163 | static int __init maxcpus(char *str) | |
164 | { | |
165 | get_option(&str, &max_cpus); | |
61ec7567 LB |
166 | if (max_cpus == 0) |
167 | disable_ioapic_setup(); | |
168 | ||
169 | return 0; | |
1da177e4 LT |
170 | } |
171 | ||
81340977 | 172 | early_param("maxcpus", maxcpus); |
8b3b2955 JB |
173 | #else |
174 | #define max_cpus NR_CPUS | |
175 | #endif | |
176 | ||
177 | /* | |
178 | * If set, this is an indication to the drivers that reset the underlying | |
179 | * device before going ahead with the initialization otherwise driver might | |
180 | * rely on the BIOS and skip the reset operation. | |
181 | * | |
182 | * This is useful if kernel is booting in an unreliable environment. | |
183 | * For ex. kdump situaiton where previous kernel has crashed, BIOS has been | |
184 | * skipped and devices will be in unknown state. | |
185 | */ | |
186 | unsigned int reset_devices; | |
187 | EXPORT_SYMBOL(reset_devices); | |
1da177e4 | 188 | |
7e96287d VG |
189 | static int __init set_reset_devices(char *str) |
190 | { | |
191 | reset_devices = 1; | |
192 | return 1; | |
193 | } | |
194 | ||
195 | __setup("reset_devices", set_reset_devices); | |
196 | ||
1da177e4 LT |
197 | static char * argv_init[MAX_INIT_ARGS+2] = { "init", NULL, }; |
198 | char * envp_init[MAX_INIT_ENVS+2] = { "HOME=/", "TERM=linux", NULL, }; | |
199 | static const char *panic_later, *panic_param; | |
200 | ||
201 | extern struct obs_kernel_param __setup_start[], __setup_end[]; | |
202 | ||
203 | static int __init obsolete_checksetup(char *line) | |
204 | { | |
205 | struct obs_kernel_param *p; | |
33df0d19 | 206 | int had_early_param = 0; |
1da177e4 LT |
207 | |
208 | p = __setup_start; | |
209 | do { | |
210 | int n = strlen(p->str); | |
211 | if (!strncmp(line, p->str, n)) { | |
212 | if (p->early) { | |
33df0d19 RR |
213 | /* Already done in parse_early_param? |
214 | * (Needs exact match on param part). | |
215 | * Keep iterating, as we can have early | |
216 | * params and __setups of same names 8( */ | |
1da177e4 | 217 | if (line[n] == '\0' || line[n] == '=') |
33df0d19 | 218 | had_early_param = 1; |
1da177e4 LT |
219 | } else if (!p->setup_func) { |
220 | printk(KERN_WARNING "Parameter %s is obsolete," | |
221 | " ignored\n", p->str); | |
222 | return 1; | |
223 | } else if (p->setup_func(line + n)) | |
224 | return 1; | |
225 | } | |
226 | p++; | |
227 | } while (p < __setup_end); | |
33df0d19 RR |
228 | |
229 | return had_early_param; | |
1da177e4 LT |
230 | } |
231 | ||
232 | /* | |
233 | * This should be approx 2 Bo*oMips to start (note initial shift), and will | |
234 | * still work even if initially too large, it will just take slightly longer | |
235 | */ | |
236 | unsigned long loops_per_jiffy = (1<<12); | |
237 | ||
238 | EXPORT_SYMBOL(loops_per_jiffy); | |
239 | ||
240 | static int __init debug_kernel(char *str) | |
241 | { | |
242 | if (*str) | |
243 | return 0; | |
244 | console_loglevel = 10; | |
245 | return 1; | |
246 | } | |
247 | ||
248 | static int __init quiet_kernel(char *str) | |
249 | { | |
250 | if (*str) | |
251 | return 0; | |
252 | console_loglevel = 4; | |
253 | return 1; | |
254 | } | |
255 | ||
256 | __setup("debug", debug_kernel); | |
257 | __setup("quiet", quiet_kernel); | |
258 | ||
259 | static int __init loglevel(char *str) | |
260 | { | |
261 | get_option(&str, &console_loglevel); | |
262 | return 1; | |
263 | } | |
264 | ||
265 | __setup("loglevel=", loglevel); | |
266 | ||
267 | /* | |
268 | * Unknown boot options get handed to init, unless they look like | |
269 | * failed parameters | |
270 | */ | |
271 | static int __init unknown_bootoption(char *param, char *val) | |
272 | { | |
273 | /* Change NUL term back to "=", to make "param" the whole string. */ | |
274 | if (val) { | |
275 | /* param=val or param="val"? */ | |
276 | if (val == param+strlen(param)+1) | |
277 | val[-1] = '='; | |
278 | else if (val == param+strlen(param)+2) { | |
279 | val[-2] = '='; | |
280 | memmove(val-1, val, strlen(val)+1); | |
281 | val--; | |
282 | } else | |
283 | BUG(); | |
284 | } | |
285 | ||
286 | /* Handle obsolete-style parameters */ | |
287 | if (obsolete_checksetup(param)) | |
288 | return 0; | |
289 | ||
290 | /* | |
291 | * Preemptive maintenance for "why didn't my mispelled command | |
292 | * line work?" | |
293 | */ | |
294 | if (strchr(param, '.') && (!val || strchr(param, '.') < val)) { | |
295 | printk(KERN_ERR "Unknown boot option `%s': ignoring\n", param); | |
296 | return 0; | |
297 | } | |
298 | ||
299 | if (panic_later) | |
300 | return 0; | |
301 | ||
302 | if (val) { | |
303 | /* Environment option */ | |
304 | unsigned int i; | |
305 | for (i = 0; envp_init[i]; i++) { | |
306 | if (i == MAX_INIT_ENVS) { | |
307 | panic_later = "Too many boot env vars at `%s'"; | |
308 | panic_param = param; | |
309 | } | |
310 | if (!strncmp(param, envp_init[i], val - param)) | |
311 | break; | |
312 | } | |
313 | envp_init[i] = param; | |
314 | } else { | |
315 | /* Command line option */ | |
316 | unsigned int i; | |
317 | for (i = 0; argv_init[i]; i++) { | |
318 | if (i == MAX_INIT_ARGS) { | |
319 | panic_later = "Too many boot init vars at `%s'"; | |
320 | panic_param = param; | |
321 | } | |
322 | } | |
323 | argv_init[i] = param; | |
324 | } | |
325 | return 0; | |
326 | } | |
327 | ||
328 | static int __init init_setup(char *str) | |
329 | { | |
330 | unsigned int i; | |
331 | ||
332 | execute_command = str; | |
333 | /* | |
334 | * In case LILO is going to boot us with default command line, | |
335 | * it prepends "auto" before the whole cmdline which makes | |
336 | * the shell think it should execute a script with such name. | |
337 | * So we ignore all arguments entered _before_ init=... [MJ] | |
338 | */ | |
339 | for (i = 1; i < MAX_INIT_ARGS; i++) | |
340 | argv_init[i] = NULL; | |
341 | return 1; | |
342 | } | |
343 | __setup("init=", init_setup); | |
344 | ||
ffdfc409 OJ |
345 | static int __init rdinit_setup(char *str) |
346 | { | |
347 | unsigned int i; | |
348 | ||
349 | ramdisk_execute_command = str; | |
350 | /* See "auto" comment in init_setup */ | |
351 | for (i = 1; i < MAX_INIT_ARGS; i++) | |
352 | argv_init[i] = NULL; | |
353 | return 1; | |
354 | } | |
355 | __setup("rdinit=", rdinit_setup); | |
356 | ||
1da177e4 LT |
357 | #ifndef CONFIG_SMP |
358 | ||
359 | #ifdef CONFIG_X86_LOCAL_APIC | |
360 | static void __init smp_init(void) | |
361 | { | |
362 | APIC_init_uniprocessor(); | |
363 | } | |
364 | #else | |
365 | #define smp_init() do { } while (0) | |
366 | #endif | |
367 | ||
368 | static inline void setup_per_cpu_areas(void) { } | |
369 | static inline void smp_prepare_cpus(unsigned int maxcpus) { } | |
370 | ||
371 | #else | |
372 | ||
373 | #ifdef __GENERIC_PER_CPU | |
b73b459f | 374 | unsigned long __per_cpu_offset[NR_CPUS] __read_mostly; |
1da177e4 LT |
375 | |
376 | EXPORT_SYMBOL(__per_cpu_offset); | |
377 | ||
378 | static void __init setup_per_cpu_areas(void) | |
379 | { | |
380 | unsigned long size, i; | |
381 | char *ptr; | |
63872f87 | 382 | unsigned long nr_possible_cpus = num_possible_cpus(); |
1da177e4 LT |
383 | |
384 | /* Copy section for each CPU (we discard the original) */ | |
b6e3590f JF |
385 | size = ALIGN(PERCPU_ENOUGH_ROOM, PAGE_SIZE); |
386 | ptr = alloc_bootmem_pages(size * nr_possible_cpus); | |
1da177e4 | 387 | |
0a945022 | 388 | for_each_possible_cpu(i) { |
1da177e4 LT |
389 | __per_cpu_offset[i] = ptr - __per_cpu_start; |
390 | memcpy(ptr, __per_cpu_start, __per_cpu_end - __per_cpu_start); | |
63872f87 | 391 | ptr += size; |
1da177e4 LT |
392 | } |
393 | } | |
394 | #endif /* !__GENERIC_PER_CPU */ | |
395 | ||
396 | /* Called by boot processor to activate the rest. */ | |
397 | static void __init smp_init(void) | |
398 | { | |
53b8a315 | 399 | unsigned int cpu; |
1da177e4 LT |
400 | |
401 | /* FIXME: This should be done in userspace --RR */ | |
53b8a315 | 402 | for_each_present_cpu(cpu) { |
1da177e4 LT |
403 | if (num_online_cpus() >= max_cpus) |
404 | break; | |
53b8a315 CL |
405 | if (!cpu_online(cpu)) |
406 | cpu_up(cpu); | |
1da177e4 LT |
407 | } |
408 | ||
409 | /* Any cleanup work */ | |
410 | printk(KERN_INFO "Brought up %ld CPUs\n", (long)num_online_cpus()); | |
411 | smp_cpus_done(max_cpus); | |
1da177e4 LT |
412 | } |
413 | ||
414 | #endif | |
415 | ||
30d7e0d4 ABL |
416 | /* |
417 | * We need to store the untouched command line for future reference. | |
418 | * We also need to store the touched command line since the parameter | |
419 | * parsing is performed in place, and we should allow a component to | |
420 | * store reference of name/value for future reference. | |
421 | */ | |
422 | static void __init setup_command_line(char *command_line) | |
423 | { | |
424 | saved_command_line = alloc_bootmem(strlen (boot_command_line)+1); | |
425 | static_command_line = alloc_bootmem(strlen (command_line)+1); | |
426 | strcpy (saved_command_line, boot_command_line); | |
427 | strcpy (static_command_line, command_line); | |
428 | } | |
429 | ||
1da177e4 LT |
430 | /* |
431 | * We need to finalize in a non-__init function or else race conditions | |
432 | * between the root thread and the init thread may cause start_kernel to | |
433 | * be reaped by free_initmem before the root thread has proceeded to | |
434 | * cpu_idle. | |
435 | * | |
436 | * gcc-3.4 accidentally inlines this function, so use noinline. | |
437 | */ | |
438 | ||
92080309 | 439 | static void noinline __init_refok rest_init(void) |
1da177e4 LT |
440 | __releases(kernel_lock) |
441 | { | |
73c27992 EB |
442 | int pid; |
443 | ||
aae5f662 | 444 | kernel_thread(kernel_init, NULL, CLONE_FS | CLONE_SIGHAND); |
1da177e4 | 445 | numa_default_policy(); |
73c27992 EB |
446 | pid = kernel_thread(kthreadd, NULL, CLONE_FS | CLONE_FILES); |
447 | kthreadd_task = find_task_by_pid(pid); | |
1da177e4 | 448 | unlock_kernel(); |
f340c0d1 IM |
449 | |
450 | /* | |
451 | * The boot idle thread must execute schedule() | |
1df21055 | 452 | * at least once to get things moving: |
f340c0d1 | 453 | */ |
1df21055 | 454 | init_idle_bootup_task(current); |
5bfb5d69 | 455 | preempt_enable_no_resched(); |
f340c0d1 | 456 | schedule(); |
5bfb5d69 | 457 | preempt_disable(); |
f340c0d1 | 458 | |
5bfb5d69 | 459 | /* Call into cpu_idle with preempt disabled */ |
1da177e4 | 460 | cpu_idle(); |
1df21055 | 461 | } |
1da177e4 LT |
462 | |
463 | /* Check for early params. */ | |
464 | static int __init do_early_param(char *param, char *val) | |
465 | { | |
466 | struct obs_kernel_param *p; | |
467 | ||
468 | for (p = __setup_start; p < __setup_end; p++) { | |
18a8bd94 YL |
469 | if ((p->early && strcmp(param, p->str) == 0) || |
470 | (strcmp(param, "console") == 0 && | |
471 | strcmp(p->str, "earlycon") == 0) | |
472 | ) { | |
1da177e4 LT |
473 | if (p->setup_func(val) != 0) |
474 | printk(KERN_WARNING | |
475 | "Malformed early option '%s'\n", param); | |
476 | } | |
477 | } | |
478 | /* We accept everything at this stage. */ | |
479 | return 0; | |
480 | } | |
481 | ||
482 | /* Arch code calls this early on, or if not, just before other parsing. */ | |
483 | void __init parse_early_param(void) | |
484 | { | |
485 | static __initdata int done = 0; | |
486 | static __initdata char tmp_cmdline[COMMAND_LINE_SIZE]; | |
487 | ||
488 | if (done) | |
489 | return; | |
490 | ||
491 | /* All fall through to do_early_param. */ | |
30d7e0d4 | 492 | strlcpy(tmp_cmdline, boot_command_line, COMMAND_LINE_SIZE); |
1da177e4 LT |
493 | parse_args("early options", tmp_cmdline, NULL, 0, do_early_param); |
494 | done = 1; | |
495 | } | |
496 | ||
497 | /* | |
498 | * Activate the first processor. | |
499 | */ | |
500 | ||
44fd2299 SS |
501 | static void __init boot_cpu_init(void) |
502 | { | |
503 | int cpu = smp_processor_id(); | |
504 | /* Mark the boot cpu "present", "online" etc for SMP and UP case */ | |
505 | cpu_set(cpu, cpu_online_map); | |
506 | cpu_set(cpu, cpu_present_map); | |
507 | cpu_set(cpu, cpu_possible_map); | |
508 | } | |
509 | ||
033ab7f8 AM |
510 | void __init __attribute__((weak)) smp_setup_processor_id(void) |
511 | { | |
512 | } | |
513 | ||
1da177e4 LT |
514 | asmlinkage void __init start_kernel(void) |
515 | { | |
516 | char * command_line; | |
517 | extern struct kernel_param __start___param[], __stop___param[]; | |
033ab7f8 AM |
518 | |
519 | smp_setup_processor_id(); | |
520 | ||
fbb9ce95 IM |
521 | /* |
522 | * Need to run as early as possible, to initialize the | |
523 | * lockdep hash: | |
524 | */ | |
c9538ed4 | 525 | unwind_init(); |
fbb9ce95 | 526 | lockdep_init(); |
ddbcc7e8 | 527 | cgroup_init_early(); |
fbb9ce95 IM |
528 | |
529 | local_irq_disable(); | |
530 | early_boot_irqs_off(); | |
243c7621 | 531 | early_init_irq_lock_class(); |
fbb9ce95 | 532 | |
1da177e4 LT |
533 | /* |
534 | * Interrupts are still disabled. Do necessary setups, then | |
535 | * enable them | |
536 | */ | |
537 | lock_kernel(); | |
906568c9 | 538 | tick_init(); |
44fd2299 | 539 | boot_cpu_init(); |
1da177e4 LT |
540 | page_address_init(); |
541 | printk(KERN_NOTICE); | |
8993780a | 542 | printk(linux_banner); |
1da177e4 | 543 | setup_arch(&command_line); |
30d7e0d4 | 544 | setup_command_line(command_line); |
690a973f | 545 | unwind_setup(); |
1da177e4 | 546 | setup_per_cpu_areas(); |
44fd2299 | 547 | smp_prepare_boot_cpu(); /* arch-specific boot-cpu hooks */ |
1da177e4 LT |
548 | |
549 | /* | |
550 | * Set up the scheduler prior starting any interrupts (such as the | |
551 | * timer interrupt). Full topology setup happens at smp_init() | |
552 | * time - but meanwhile we still have a functioning scheduler. | |
553 | */ | |
554 | sched_init(); | |
555 | /* | |
556 | * Disable preemption - early bootup scheduling is extremely | |
557 | * fragile until we cpu_idle() for the first time. | |
558 | */ | |
559 | preempt_disable(); | |
560 | build_all_zonelists(); | |
561 | page_alloc_init(); | |
30d7e0d4 | 562 | printk(KERN_NOTICE "Kernel command line: %s\n", boot_command_line); |
1da177e4 | 563 | parse_early_param(); |
30d7e0d4 | 564 | parse_args("Booting kernel", static_command_line, __start___param, |
1da177e4 LT |
565 | __stop___param - __start___param, |
566 | &unknown_bootoption); | |
c4a68306 AB |
567 | if (!irqs_disabled()) { |
568 | printk(KERN_WARNING "start_kernel(): bug: interrupts were " | |
569 | "enabled *very* early, fixing it\n"); | |
570 | local_irq_disable(); | |
571 | } | |
1da177e4 LT |
572 | sort_main_extable(); |
573 | trap_init(); | |
574 | rcu_init(); | |
575 | init_IRQ(); | |
576 | pidhash_init(); | |
577 | init_timers(); | |
c0a31329 | 578 | hrtimers_init(); |
1da177e4 | 579 | softirq_init(); |
ad596171 | 580 | timekeeping_init(); |
88fecaa2 | 581 | time_init(); |
93e02814 HC |
582 | profile_init(); |
583 | if (!irqs_disabled()) | |
584 | printk("start_kernel(): bug: interrupts were enabled early\n"); | |
fbb9ce95 | 585 | early_boot_irqs_on(); |
93e02814 | 586 | local_irq_enable(); |
1da177e4 LT |
587 | |
588 | /* | |
589 | * HACK ALERT! This is early. We're enabling the console before | |
590 | * we've done PCI setups etc, and console_init() must be aware of | |
591 | * this. But we do want output early, in case something goes wrong. | |
592 | */ | |
593 | console_init(); | |
594 | if (panic_later) | |
595 | panic(panic_later, panic_param); | |
fbb9ce95 IM |
596 | |
597 | lockdep_info(); | |
598 | ||
9a11b49a IM |
599 | /* |
600 | * Need to run this when irqs are enabled, because it wants | |
601 | * to self-test [hard/soft]-irqs on/off lock inversion bugs | |
602 | * too: | |
603 | */ | |
604 | locking_selftest(); | |
605 | ||
1da177e4 LT |
606 | #ifdef CONFIG_BLK_DEV_INITRD |
607 | if (initrd_start && !initrd_below_start_ok && | |
608 | initrd_start < min_low_pfn << PAGE_SHIFT) { | |
609 | printk(KERN_CRIT "initrd overwritten (0x%08lx < 0x%08lx) - " | |
610 | "disabling it.\n",initrd_start,min_low_pfn << PAGE_SHIFT); | |
611 | initrd_start = 0; | |
612 | } | |
613 | #endif | |
614 | vfs_caches_init_early(); | |
c417f024 | 615 | cpuset_init_early(); |
1da177e4 LT |
616 | mem_init(); |
617 | kmem_cache_init(); | |
e7c8d5c9 | 618 | setup_per_cpu_pageset(); |
1da177e4 LT |
619 | numa_policy_init(); |
620 | if (late_time_init) | |
621 | late_time_init(); | |
622 | calibrate_delay(); | |
623 | pidmap_init(); | |
624 | pgtable_cache_init(); | |
625 | prio_tree_init(); | |
626 | anon_vma_init(); | |
627 | #ifdef CONFIG_X86 | |
628 | if (efi_enabled) | |
629 | efi_enter_virtual_mode(); | |
630 | #endif | |
631 | fork_init(num_physpages); | |
632 | proc_caches_init(); | |
633 | buffer_init(); | |
634 | unnamed_dev_init(); | |
635 | key_init(); | |
636 | security_init(); | |
637 | vfs_caches_init(num_physpages); | |
638 | radix_tree_init(); | |
639 | signals_init(); | |
640 | /* rootfs populating might need page-writeback */ | |
641 | page_writeback_init(); | |
642 | #ifdef CONFIG_PROC_FS | |
643 | proc_root_init(); | |
644 | #endif | |
ddbcc7e8 | 645 | cgroup_init(); |
1da177e4 | 646 | cpuset_init(); |
c757249a | 647 | taskstats_init_early(); |
ca74e92b | 648 | delayacct_init(); |
1da177e4 LT |
649 | |
650 | check_bugs(); | |
651 | ||
652 | acpi_early_init(); /* before LAPIC and SMP init */ | |
653 | ||
654 | /* Do the rest non-__init'ed, we're now alive */ | |
655 | rest_init(); | |
656 | } | |
657 | ||
658 | static int __initdata initcall_debug; | |
659 | ||
660 | static int __init initcall_debug_setup(char *str) | |
661 | { | |
662 | initcall_debug = 1; | |
663 | return 1; | |
664 | } | |
665 | __setup("initcall_debug", initcall_debug_setup); | |
666 | ||
1da177e4 LT |
667 | extern initcall_t __initcall_start[], __initcall_end[]; |
668 | ||
669 | static void __init do_initcalls(void) | |
670 | { | |
671 | initcall_t *call; | |
672 | int count = preempt_count(); | |
673 | ||
674 | for (call = __initcall_start; call < __initcall_end; call++) { | |
8f0c45cd | 675 | ktime_t t0, t1, delta; |
c1cda48a AM |
676 | char *msg = NULL; |
677 | char msgbuf[40]; | |
678 | int result; | |
1da177e4 LT |
679 | |
680 | if (initcall_debug) { | |
c1cda48a AM |
681 | printk("Calling initcall 0x%p", *call); |
682 | print_fn_descriptor_symbol(": %s()", | |
683 | (unsigned long) *call); | |
1da177e4 | 684 | printk("\n"); |
8f0c45cd | 685 | t0 = ktime_get(); |
1da177e4 LT |
686 | } |
687 | ||
c1cda48a | 688 | result = (*call)(); |
1da177e4 | 689 | |
8f0c45cd IM |
690 | if (initcall_debug) { |
691 | t1 = ktime_get(); | |
692 | delta = ktime_sub(t1, t0); | |
693 | ||
694 | printk("initcall 0x%p", *call); | |
695 | print_fn_descriptor_symbol(": %s()", | |
696 | (unsigned long) *call); | |
697 | printk(" returned %d.\n", result); | |
698 | ||
699 | printk("initcall 0x%p ran for %Ld msecs: ", | |
700 | *call, (unsigned long long)delta.tv64 >> 20); | |
701 | print_fn_descriptor_symbol("%s()\n", | |
702 | (unsigned long) *call); | |
703 | } | |
704 | ||
f3a19cb4 | 705 | if (result && result != -ENODEV && initcall_debug) { |
c1cda48a AM |
706 | sprintf(msgbuf, "error code %d", result); |
707 | msg = msgbuf; | |
708 | } | |
1da177e4 LT |
709 | if (preempt_count() != count) { |
710 | msg = "preemption imbalance"; | |
711 | preempt_count() = count; | |
712 | } | |
713 | if (irqs_disabled()) { | |
714 | msg = "disabled interrupts"; | |
715 | local_irq_enable(); | |
716 | } | |
717 | if (msg) { | |
c1cda48a AM |
718 | printk(KERN_WARNING "initcall at 0x%p", *call); |
719 | print_fn_descriptor_symbol(": %s()", | |
720 | (unsigned long) *call); | |
721 | printk(": returned with %s\n", msg); | |
1da177e4 LT |
722 | } |
723 | } | |
724 | ||
725 | /* Make sure there is no pending stuff from the initcall sequence */ | |
726 | flush_scheduled_work(); | |
727 | } | |
728 | ||
729 | /* | |
730 | * Ok, the machine is now initialized. None of the devices | |
731 | * have been touched yet, but the CPU subsystem is up and | |
732 | * running, and memory and process management works. | |
733 | * | |
734 | * Now we can finally start doing some real work.. | |
735 | */ | |
736 | static void __init do_basic_setup(void) | |
737 | { | |
738 | /* drivers will send hotplug events */ | |
739 | init_workqueues(); | |
740 | usermodehelper_init(); | |
741 | driver_init(); | |
b04c3afb | 742 | init_irq_proc(); |
1da177e4 LT |
743 | do_initcalls(); |
744 | } | |
745 | ||
97842216 DJ |
746 | static int __initdata nosoftlockup; |
747 | ||
748 | static int __init nosoftlockup_setup(char *str) | |
749 | { | |
750 | nosoftlockup = 1; | |
751 | return 1; | |
752 | } | |
753 | __setup("nosoftlockup", nosoftlockup_setup); | |
754 | ||
88d20328 | 755 | static void __init do_pre_smp_initcalls(void) |
1da177e4 LT |
756 | { |
757 | extern int spawn_ksoftirqd(void); | |
758 | #ifdef CONFIG_SMP | |
759 | extern int migration_init(void); | |
760 | ||
761 | migration_init(); | |
762 | #endif | |
763 | spawn_ksoftirqd(); | |
97842216 DJ |
764 | if (!nosoftlockup) |
765 | spawn_softlockup_task(); | |
1da177e4 LT |
766 | } |
767 | ||
768 | static void run_init_process(char *init_filename) | |
769 | { | |
770 | argv_init[0] = init_filename; | |
67608567 | 771 | kernel_execve(init_filename, argv_init, envp_init); |
1da177e4 LT |
772 | } |
773 | ||
ee5bfa64 VG |
774 | /* This is a non __init function. Force it to be noinline otherwise gcc |
775 | * makes it inline to init() and it becomes part of init.text section | |
776 | */ | |
777 | static int noinline init_post(void) | |
778 | { | |
779 | free_initmem(); | |
780 | unlock_kernel(); | |
781 | mark_rodata_ro(); | |
782 | system_state = SYSTEM_RUNNING; | |
783 | numa_default_policy(); | |
784 | ||
785 | if (sys_open((const char __user *) "/dev/console", O_RDWR, 0) < 0) | |
786 | printk(KERN_WARNING "Warning: unable to open an initial console.\n"); | |
787 | ||
788 | (void) sys_dup(0); | |
789 | (void) sys_dup(0); | |
790 | ||
791 | if (ramdisk_execute_command) { | |
792 | run_init_process(ramdisk_execute_command); | |
793 | printk(KERN_WARNING "Failed to execute %s\n", | |
794 | ramdisk_execute_command); | |
795 | } | |
796 | ||
797 | /* | |
798 | * We try each of these until one succeeds. | |
799 | * | |
800 | * The Bourne shell can be used instead of init if we are | |
801 | * trying to recover a really broken machine. | |
802 | */ | |
803 | if (execute_command) { | |
804 | run_init_process(execute_command); | |
805 | printk(KERN_WARNING "Failed to execute %s. Attempting " | |
806 | "defaults...\n", execute_command); | |
807 | } | |
808 | run_init_process("/sbin/init"); | |
809 | run_init_process("/etc/init"); | |
810 | run_init_process("/bin/init"); | |
811 | run_init_process("/bin/sh"); | |
812 | ||
813 | panic("No init found. Try passing init= option to kernel."); | |
814 | } | |
815 | ||
aae5f662 | 816 | static int __init kernel_init(void * unused) |
1da177e4 LT |
817 | { |
818 | lock_kernel(); | |
819 | /* | |
820 | * init can run on any cpu. | |
821 | */ | |
822 | set_cpus_allowed(current, CPU_MASK_ALL); | |
823 | /* | |
824 | * Tell the world that we're going to be the grim | |
825 | * reaper of innocent orphaned children. | |
826 | * | |
827 | * We don't want people to have to make incorrect | |
828 | * assumptions about where in the task array this | |
829 | * can be found. | |
830 | */ | |
84d73786 | 831 | init_pid_ns.child_reaper = current; |
1da177e4 | 832 | |
0e29b24a | 833 | __set_special_pids(1, 1); |
9ec52099 CLG |
834 | cad_pid = task_pid(current); |
835 | ||
1da177e4 LT |
836 | smp_prepare_cpus(max_cpus); |
837 | ||
838 | do_pre_smp_initcalls(); | |
839 | ||
1da177e4 LT |
840 | smp_init(); |
841 | sched_init_smp(); | |
842 | ||
843 | cpuset_init_smp(); | |
844 | ||
1da177e4 LT |
845 | do_basic_setup(); |
846 | ||
847 | /* | |
848 | * check if there is an early userspace init. If yes, let it do all | |
849 | * the work | |
850 | */ | |
ffdfc409 OJ |
851 | |
852 | if (!ramdisk_execute_command) | |
853 | ramdisk_execute_command = "/init"; | |
854 | ||
855 | if (sys_access((const char __user *) ramdisk_execute_command, 0) != 0) { | |
856 | ramdisk_execute_command = NULL; | |
1da177e4 | 857 | prepare_namespace(); |
ffdfc409 | 858 | } |
1da177e4 LT |
859 | |
860 | /* | |
861 | * Ok, we have completed the initial bootup, and | |
862 | * we're essentially up and running. Get rid of the | |
863 | * initmem segments and start the user-mode stuff.. | |
864 | */ | |
ee5bfa64 VG |
865 | init_post(); |
866 | return 0; | |
1da177e4 | 867 | } |