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> | |
9b5609fd | 17 | #include <linux/stackprotector.h> |
1da177e4 LT |
18 | #include <linux/string.h> |
19 | #include <linux/ctype.h> | |
20 | #include <linux/delay.h> | |
1da177e4 LT |
21 | #include <linux/ioport.h> |
22 | #include <linux/init.h> | |
1da177e4 | 23 | #include <linux/initrd.h> |
1da177e4 | 24 | #include <linux/bootmem.h> |
4a7a16dc | 25 | #include <linux/acpi.h> |
1da177e4 | 26 | #include <linux/tty.h> |
1da177e4 LT |
27 | #include <linux/percpu.h> |
28 | #include <linux/kmod.h> | |
db64fe02 | 29 | #include <linux/vmalloc.h> |
1da177e4 | 30 | #include <linux/kernel_stat.h> |
d7cd5611 | 31 | #include <linux/start_kernel.h> |
1da177e4 | 32 | #include <linux/security.h> |
3d442233 | 33 | #include <linux/smp.h> |
1da177e4 LT |
34 | #include <linux/profile.h> |
35 | #include <linux/rcupdate.h> | |
36 | #include <linux/moduleparam.h> | |
37 | #include <linux/kallsyms.h> | |
38 | #include <linux/writeback.h> | |
39 | #include <linux/cpu.h> | |
40 | #include <linux/cpuset.h> | |
ddbcc7e8 | 41 | #include <linux/cgroup.h> |
1da177e4 | 42 | #include <linux/efi.h> |
906568c9 | 43 | #include <linux/tick.h> |
6168a702 | 44 | #include <linux/interrupt.h> |
c757249a | 45 | #include <linux/taskstats_kern.h> |
ca74e92b | 46 | #include <linux/delayacct.h> |
1da177e4 LT |
47 | #include <linux/unistd.h> |
48 | #include <linux/rmap.h> | |
49 | #include <linux/mempolicy.h> | |
50 | #include <linux/key.h> | |
b6cd0b77 | 51 | #include <linux/buffer_head.h> |
94b6da5a | 52 | #include <linux/page_cgroup.h> |
9a11b49a | 53 | #include <linux/debug_locks.h> |
3ac7fe5a | 54 | #include <linux/debugobjects.h> |
fbb9ce95 | 55 | #include <linux/lockdep.h> |
3c7b4e6b | 56 | #include <linux/kmemleak.h> |
84d73786 | 57 | #include <linux/pid_namespace.h> |
1f21782e | 58 | #include <linux/device.h> |
73c27992 | 59 | #include <linux/kthread.h> |
e6fe6649 | 60 | #include <linux/sched.h> |
a1c9eea9 | 61 | #include <linux/signal.h> |
199f0ca5 | 62 | #include <linux/idr.h> |
0b4b3827 | 63 | #include <linux/kgdb.h> |
68bf21aa | 64 | #include <linux/ftrace.h> |
22a9d645 | 65 | #include <linux/async.h> |
dfec072e | 66 | #include <linux/kmemcheck.h> |
6ae6996a | 67 | #include <linux/sfi.h> |
2b2af54a | 68 | #include <linux/shmem_fs.h> |
5a0e3ad6 | 69 | #include <linux/slab.h> |
24a24bb6 | 70 | #include <linux/perf_event.h> |
1da177e4 LT |
71 | |
72 | #include <asm/io.h> | |
73 | #include <asm/bugs.h> | |
74 | #include <asm/setup.h> | |
a940199f | 75 | #include <asm/sections.h> |
37b73c82 | 76 | #include <asm/cacheflush.h> |
1da177e4 | 77 | |
1da177e4 LT |
78 | #ifdef CONFIG_X86_LOCAL_APIC |
79 | #include <asm/smp.h> | |
80 | #endif | |
81 | ||
aae5f662 | 82 | static int kernel_init(void *); |
1da177e4 LT |
83 | |
84 | extern void init_IRQ(void); | |
1da177e4 LT |
85 | extern void fork_init(unsigned long); |
86 | extern void mca_init(void); | |
87 | extern void sbus_init(void); | |
1da177e4 LT |
88 | extern void prio_tree_init(void); |
89 | extern void radix_tree_init(void); | |
90 | extern void free_initmem(void); | |
37b73c82 AV |
91 | #ifndef CONFIG_DEBUG_RODATA |
92 | static inline void mark_rodata_ro(void) { } | |
93 | #endif | |
1da177e4 LT |
94 | |
95 | #ifdef CONFIG_TC | |
96 | extern void tc_init(void); | |
97 | #endif | |
98 | ||
2ce802f6 TH |
99 | /* |
100 | * Debug helper: via this flag we know that we are in 'early bootup code' | |
101 | * where only the boot processor is running with IRQ disabled. This means | |
102 | * two things - IRQ must not be enabled before the flag is cleared and some | |
103 | * operations which are not allowed with IRQ disabled are allowed while the | |
104 | * flag is set. | |
105 | */ | |
106 | bool early_boot_irqs_disabled __read_mostly; | |
107 | ||
a6826048 | 108 | enum system_states system_state __read_mostly; |
1da177e4 LT |
109 | EXPORT_SYMBOL(system_state); |
110 | ||
111 | /* | |
112 | * Boot command-line arguments | |
113 | */ | |
114 | #define MAX_INIT_ARGS CONFIG_INIT_ENV_ARG_LIMIT | |
115 | #define MAX_INIT_ENVS CONFIG_INIT_ENV_ARG_LIMIT | |
116 | ||
117 | extern void time_init(void); | |
118 | /* Default late time init is NULL. archs can override this later. */ | |
d2e3192b | 119 | void (*__initdata late_time_init)(void); |
1da177e4 LT |
120 | extern void softirq_init(void); |
121 | ||
30d7e0d4 ABL |
122 | /* Untouched command line saved by arch-specific code. */ |
123 | char __initdata boot_command_line[COMMAND_LINE_SIZE]; | |
124 | /* Untouched saved command line (eg. for /proc) */ | |
125 | char *saved_command_line; | |
126 | /* Command line for parameter parsing */ | |
127 | static char *static_command_line; | |
1da177e4 LT |
128 | |
129 | static char *execute_command; | |
ffdfc409 | 130 | static char *ramdisk_execute_command; |
1da177e4 | 131 | |
8b3b2955 | 132 | #ifdef CONFIG_SMP |
1da177e4 | 133 | /* Setup configured maximum number of CPUs to activate */ |
75cbfb97 TR |
134 | unsigned int setup_max_cpus = NR_CPUS; |
135 | EXPORT_SYMBOL(setup_max_cpus); | |
136 | ||
7e96287d | 137 | |
1da177e4 LT |
138 | /* |
139 | * Setup routine for controlling SMP activation | |
140 | * | |
141 | * Command-line option of "nosmp" or "maxcpus=0" will disable SMP | |
142 | * activation entirely (the MPS table probe still happens, though). | |
143 | * | |
144 | * Command-line option of "maxcpus=<NUM>", where <NUM> is an integer | |
145 | * greater than 0, limits the maximum number of CPUs activated in | |
146 | * SMP mode to <NUM>. | |
147 | */ | |
65a4e574 IM |
148 | |
149 | void __weak arch_disable_smp_support(void) { } | |
61ec7567 | 150 | |
1da177e4 LT |
151 | static int __init nosmp(char *str) |
152 | { | |
ca74a6f8 | 153 | setup_max_cpus = 0; |
65a4e574 IM |
154 | arch_disable_smp_support(); |
155 | ||
8b3b2955 | 156 | return 0; |
1da177e4 LT |
157 | } |
158 | ||
8b3b2955 | 159 | early_param("nosmp", nosmp); |
1da177e4 | 160 | |
2b633e3f YL |
161 | /* this is hard limit */ |
162 | static int __init nrcpus(char *str) | |
163 | { | |
164 | int nr_cpus; | |
165 | ||
166 | get_option(&str, &nr_cpus); | |
167 | if (nr_cpus > 0 && nr_cpus < nr_cpu_ids) | |
168 | nr_cpu_ids = nr_cpus; | |
169 | ||
170 | return 0; | |
171 | } | |
172 | ||
173 | early_param("nr_cpus", nrcpus); | |
174 | ||
1da177e4 LT |
175 | static int __init maxcpus(char *str) |
176 | { | |
ca74a6f8 AK |
177 | get_option(&str, &setup_max_cpus); |
178 | if (setup_max_cpus == 0) | |
65a4e574 | 179 | arch_disable_smp_support(); |
61ec7567 LB |
180 | |
181 | return 0; | |
1da177e4 LT |
182 | } |
183 | ||
81340977 | 184 | early_param("maxcpus", maxcpus); |
8b3b2955 | 185 | #else |
7463e633 | 186 | static const unsigned int setup_max_cpus = NR_CPUS; |
8b3b2955 JB |
187 | #endif |
188 | ||
189 | /* | |
190 | * If set, this is an indication to the drivers that reset the underlying | |
191 | * device before going ahead with the initialization otherwise driver might | |
192 | * rely on the BIOS and skip the reset operation. | |
193 | * | |
194 | * This is useful if kernel is booting in an unreliable environment. | |
195 | * For ex. kdump situaiton where previous kernel has crashed, BIOS has been | |
196 | * skipped and devices will be in unknown state. | |
197 | */ | |
198 | unsigned int reset_devices; | |
199 | EXPORT_SYMBOL(reset_devices); | |
1da177e4 | 200 | |
7e96287d VG |
201 | static int __init set_reset_devices(char *str) |
202 | { | |
203 | reset_devices = 1; | |
204 | return 1; | |
205 | } | |
206 | ||
207 | __setup("reset_devices", set_reset_devices); | |
208 | ||
d7627467 DH |
209 | static const char * argv_init[MAX_INIT_ARGS+2] = { "init", NULL, }; |
210 | const char * envp_init[MAX_INIT_ENVS+2] = { "HOME=/", "TERM=linux", NULL, }; | |
1da177e4 LT |
211 | static const char *panic_later, *panic_param; |
212 | ||
914dcaa8 | 213 | extern const struct obs_kernel_param __setup_start[], __setup_end[]; |
1da177e4 LT |
214 | |
215 | static int __init obsolete_checksetup(char *line) | |
216 | { | |
914dcaa8 | 217 | const struct obs_kernel_param *p; |
33df0d19 | 218 | int had_early_param = 0; |
1da177e4 LT |
219 | |
220 | p = __setup_start; | |
221 | do { | |
222 | int n = strlen(p->str); | |
223 | if (!strncmp(line, p->str, n)) { | |
224 | if (p->early) { | |
33df0d19 RR |
225 | /* Already done in parse_early_param? |
226 | * (Needs exact match on param part). | |
227 | * Keep iterating, as we can have early | |
228 | * params and __setups of same names 8( */ | |
1da177e4 | 229 | if (line[n] == '\0' || line[n] == '=') |
33df0d19 | 230 | had_early_param = 1; |
1da177e4 LT |
231 | } else if (!p->setup_func) { |
232 | printk(KERN_WARNING "Parameter %s is obsolete," | |
233 | " ignored\n", p->str); | |
234 | return 1; | |
235 | } else if (p->setup_func(line + n)) | |
236 | return 1; | |
237 | } | |
238 | p++; | |
239 | } while (p < __setup_end); | |
33df0d19 RR |
240 | |
241 | return had_early_param; | |
1da177e4 LT |
242 | } |
243 | ||
244 | /* | |
245 | * This should be approx 2 Bo*oMips to start (note initial shift), and will | |
246 | * still work even if initially too large, it will just take slightly longer | |
247 | */ | |
248 | unsigned long loops_per_jiffy = (1<<12); | |
249 | ||
250 | EXPORT_SYMBOL(loops_per_jiffy); | |
251 | ||
252 | static int __init debug_kernel(char *str) | |
253 | { | |
1da177e4 | 254 | console_loglevel = 10; |
f6f21c81 | 255 | return 0; |
1da177e4 LT |
256 | } |
257 | ||
258 | static int __init quiet_kernel(char *str) | |
259 | { | |
1da177e4 | 260 | console_loglevel = 4; |
f6f21c81 | 261 | return 0; |
1da177e4 LT |
262 | } |
263 | ||
f6f21c81 YL |
264 | early_param("debug", debug_kernel); |
265 | early_param("quiet", quiet_kernel); | |
1da177e4 LT |
266 | |
267 | static int __init loglevel(char *str) | |
268 | { | |
269 | get_option(&str, &console_loglevel); | |
d9d4fcfe | 270 | return 0; |
1da177e4 LT |
271 | } |
272 | ||
f6f21c81 | 273 | early_param("loglevel", loglevel); |
1da177e4 LT |
274 | |
275 | /* | |
276 | * Unknown boot options get handed to init, unless they look like | |
f066a4f6 | 277 | * unused parameters (modprobe will find them in /proc/cmdline). |
1da177e4 LT |
278 | */ |
279 | static int __init unknown_bootoption(char *param, char *val) | |
280 | { | |
281 | /* Change NUL term back to "=", to make "param" the whole string. */ | |
282 | if (val) { | |
283 | /* param=val or param="val"? */ | |
284 | if (val == param+strlen(param)+1) | |
285 | val[-1] = '='; | |
286 | else if (val == param+strlen(param)+2) { | |
287 | val[-2] = '='; | |
288 | memmove(val-1, val, strlen(val)+1); | |
289 | val--; | |
290 | } else | |
291 | BUG(); | |
292 | } | |
293 | ||
294 | /* Handle obsolete-style parameters */ | |
295 | if (obsolete_checksetup(param)) | |
296 | return 0; | |
297 | ||
f066a4f6 RR |
298 | /* Unused module parameter. */ |
299 | if (strchr(param, '.') && (!val || strchr(param, '.') < val)) | |
1da177e4 | 300 | return 0; |
1da177e4 LT |
301 | |
302 | if (panic_later) | |
303 | return 0; | |
304 | ||
305 | if (val) { | |
306 | /* Environment option */ | |
307 | unsigned int i; | |
308 | for (i = 0; envp_init[i]; i++) { | |
309 | if (i == MAX_INIT_ENVS) { | |
310 | panic_later = "Too many boot env vars at `%s'"; | |
311 | panic_param = param; | |
312 | } | |
313 | if (!strncmp(param, envp_init[i], val - param)) | |
314 | break; | |
315 | } | |
316 | envp_init[i] = param; | |
317 | } else { | |
318 | /* Command line option */ | |
319 | unsigned int i; | |
320 | for (i = 0; argv_init[i]; i++) { | |
321 | if (i == MAX_INIT_ARGS) { | |
322 | panic_later = "Too many boot init vars at `%s'"; | |
323 | panic_param = param; | |
324 | } | |
325 | } | |
326 | argv_init[i] = param; | |
327 | } | |
328 | return 0; | |
329 | } | |
330 | ||
12d6f21e IM |
331 | #ifdef CONFIG_DEBUG_PAGEALLOC |
332 | int __read_mostly debug_pagealloc_enabled = 0; | |
333 | #endif | |
334 | ||
1da177e4 LT |
335 | static int __init init_setup(char *str) |
336 | { | |
337 | unsigned int i; | |
338 | ||
339 | execute_command = str; | |
340 | /* | |
341 | * In case LILO is going to boot us with default command line, | |
342 | * it prepends "auto" before the whole cmdline which makes | |
343 | * the shell think it should execute a script with such name. | |
344 | * So we ignore all arguments entered _before_ init=... [MJ] | |
345 | */ | |
346 | for (i = 1; i < MAX_INIT_ARGS; i++) | |
347 | argv_init[i] = NULL; | |
348 | return 1; | |
349 | } | |
350 | __setup("init=", init_setup); | |
351 | ||
ffdfc409 OJ |
352 | static int __init rdinit_setup(char *str) |
353 | { | |
354 | unsigned int i; | |
355 | ||
356 | ramdisk_execute_command = str; | |
357 | /* See "auto" comment in init_setup */ | |
358 | for (i = 1; i < MAX_INIT_ARGS; i++) | |
359 | argv_init[i] = NULL; | |
360 | return 1; | |
361 | } | |
362 | __setup("rdinit=", rdinit_setup); | |
363 | ||
1da177e4 LT |
364 | #ifndef CONFIG_SMP |
365 | ||
366 | #ifdef CONFIG_X86_LOCAL_APIC | |
367 | static void __init smp_init(void) | |
368 | { | |
369 | APIC_init_uniprocessor(); | |
370 | } | |
371 | #else | |
372 | #define smp_init() do { } while (0) | |
373 | #endif | |
374 | ||
e0982e90 | 375 | static inline void setup_nr_cpu_ids(void) { } |
1da177e4 LT |
376 | static inline void smp_prepare_cpus(unsigned int maxcpus) { } |
377 | ||
378 | #else | |
379 | ||
e0982e90 MT |
380 | /* Setup number of possible processor ids */ |
381 | int nr_cpu_ids __read_mostly = NR_CPUS; | |
382 | EXPORT_SYMBOL(nr_cpu_ids); | |
383 | ||
384 | /* An arch may set nr_cpu_ids earlier if needed, so this would be redundant */ | |
385 | static void __init setup_nr_cpu_ids(void) | |
386 | { | |
e0c0ba73 | 387 | nr_cpu_ids = find_last_bit(cpumask_bits(cpu_possible_mask),NR_CPUS) + 1; |
e0982e90 MT |
388 | } |
389 | ||
1da177e4 LT |
390 | /* Called by boot processor to activate the rest. */ |
391 | static void __init smp_init(void) | |
392 | { | |
53b8a315 | 393 | unsigned int cpu; |
1da177e4 LT |
394 | |
395 | /* FIXME: This should be done in userspace --RR */ | |
53b8a315 | 396 | for_each_present_cpu(cpu) { |
ca74a6f8 | 397 | if (num_online_cpus() >= setup_max_cpus) |
1da177e4 | 398 | break; |
53b8a315 CL |
399 | if (!cpu_online(cpu)) |
400 | cpu_up(cpu); | |
1da177e4 LT |
401 | } |
402 | ||
403 | /* Any cleanup work */ | |
404 | printk(KERN_INFO "Brought up %ld CPUs\n", (long)num_online_cpus()); | |
ca74a6f8 | 405 | smp_cpus_done(setup_max_cpus); |
1da177e4 LT |
406 | } |
407 | ||
408 | #endif | |
409 | ||
30d7e0d4 ABL |
410 | /* |
411 | * We need to store the untouched command line for future reference. | |
412 | * We also need to store the touched command line since the parameter | |
413 | * parsing is performed in place, and we should allow a component to | |
414 | * store reference of name/value for future reference. | |
415 | */ | |
416 | static void __init setup_command_line(char *command_line) | |
417 | { | |
418 | saved_command_line = alloc_bootmem(strlen (boot_command_line)+1); | |
419 | static_command_line = alloc_bootmem(strlen (command_line)+1); | |
420 | strcpy (saved_command_line, boot_command_line); | |
421 | strcpy (static_command_line, command_line); | |
422 | } | |
423 | ||
1da177e4 LT |
424 | /* |
425 | * We need to finalize in a non-__init function or else race conditions | |
426 | * between the root thread and the init thread may cause start_kernel to | |
427 | * be reaped by free_initmem before the root thread has proceeded to | |
428 | * cpu_idle. | |
429 | * | |
430 | * gcc-3.4 accidentally inlines this function, so use noinline. | |
431 | */ | |
432 | ||
b433c3d4 PZ |
433 | static __initdata DECLARE_COMPLETION(kthreadd_done); |
434 | ||
f99ebf0a | 435 | static noinline void __init_refok rest_init(void) |
1da177e4 | 436 | { |
73c27992 EB |
437 | int pid; |
438 | ||
7db905e6 | 439 | rcu_scheduler_starting(); |
b433c3d4 | 440 | /* |
97158569 | 441 | * We need to spawn init first so that it obtains pid 1, however |
b433c3d4 PZ |
442 | * the init task will end up wanting to create kthreads, which, if |
443 | * we schedule it before we create kthreadd, will OOPS. | |
444 | */ | |
aae5f662 | 445 | kernel_thread(kernel_init, NULL, CLONE_FS | CLONE_SIGHAND); |
1da177e4 | 446 | numa_default_policy(); |
73c27992 | 447 | pid = kernel_thread(kthreadd, NULL, CLONE_FS | CLONE_FILES); |
d11c563d | 448 | rcu_read_lock(); |
5cd20455 | 449 | kthreadd_task = find_task_by_pid_ns(pid, &init_pid_ns); |
d11c563d | 450 | rcu_read_unlock(); |
b433c3d4 | 451 | complete(&kthreadd_done); |
f340c0d1 IM |
452 | |
453 | /* | |
454 | * The boot idle thread must execute schedule() | |
1df21055 | 455 | * at least once to get things moving: |
f340c0d1 | 456 | */ |
1df21055 | 457 | init_idle_bootup_task(current); |
5bfb5d69 | 458 | preempt_enable_no_resched(); |
f340c0d1 | 459 | schedule(); |
5bfb5d69 | 460 | preempt_disable(); |
f340c0d1 | 461 | |
5bfb5d69 | 462 | /* Call into cpu_idle with preempt disabled */ |
1da177e4 | 463 | cpu_idle(); |
1df21055 | 464 | } |
1da177e4 LT |
465 | |
466 | /* Check for early params. */ | |
467 | static int __init do_early_param(char *param, char *val) | |
468 | { | |
914dcaa8 | 469 | const struct obs_kernel_param *p; |
1da177e4 LT |
470 | |
471 | for (p = __setup_start; p < __setup_end; p++) { | |
18a8bd94 YL |
472 | if ((p->early && strcmp(param, p->str) == 0) || |
473 | (strcmp(param, "console") == 0 && | |
474 | strcmp(p->str, "earlycon") == 0) | |
475 | ) { | |
1da177e4 LT |
476 | if (p->setup_func(val) != 0) |
477 | printk(KERN_WARNING | |
478 | "Malformed early option '%s'\n", param); | |
479 | } | |
480 | } | |
481 | /* We accept everything at this stage. */ | |
482 | return 0; | |
483 | } | |
484 | ||
13977091 MD |
485 | void __init parse_early_options(char *cmdline) |
486 | { | |
487 | parse_args("early options", cmdline, NULL, 0, do_early_param); | |
488 | } | |
489 | ||
1da177e4 LT |
490 | /* Arch code calls this early on, or if not, just before other parsing. */ |
491 | void __init parse_early_param(void) | |
492 | { | |
493 | static __initdata int done = 0; | |
494 | static __initdata char tmp_cmdline[COMMAND_LINE_SIZE]; | |
495 | ||
496 | if (done) | |
497 | return; | |
498 | ||
499 | /* All fall through to do_early_param. */ | |
30d7e0d4 | 500 | strlcpy(tmp_cmdline, boot_command_line, COMMAND_LINE_SIZE); |
13977091 | 501 | parse_early_options(tmp_cmdline); |
1da177e4 LT |
502 | done = 1; |
503 | } | |
504 | ||
505 | /* | |
506 | * Activate the first processor. | |
507 | */ | |
508 | ||
44fd2299 SS |
509 | static void __init boot_cpu_init(void) |
510 | { | |
511 | int cpu = smp_processor_id(); | |
512 | /* Mark the boot cpu "present", "online" etc for SMP and UP case */ | |
915441b6 | 513 | set_cpu_online(cpu, true); |
933b0618 | 514 | set_cpu_active(cpu, true); |
915441b6 RR |
515 | set_cpu_present(cpu, true); |
516 | set_cpu_possible(cpu, true); | |
44fd2299 SS |
517 | } |
518 | ||
839ad62e | 519 | void __init __weak smp_setup_processor_id(void) |
033ab7f8 AM |
520 | { |
521 | } | |
522 | ||
8c9843e5 BH |
523 | void __init __weak thread_info_cache_init(void) |
524 | { | |
525 | } | |
526 | ||
444f478f PE |
527 | /* |
528 | * Set up kernel memory allocators | |
529 | */ | |
530 | static void __init mm_init(void) | |
531 | { | |
ca371c0d KH |
532 | /* |
533 | * page_cgroup requires countinous pages as memmap | |
534 | * and it's bigger than MAX_ORDER unless SPARSEMEM. | |
535 | */ | |
536 | page_cgroup_init_flatmem(); | |
444f478f PE |
537 | mem_init(); |
538 | kmem_cache_init(); | |
099a19d9 | 539 | percpu_init_late(); |
c868d550 | 540 | pgtable_cache_init(); |
444f478f PE |
541 | vmalloc_init(); |
542 | } | |
543 | ||
1da177e4 LT |
544 | asmlinkage void __init start_kernel(void) |
545 | { | |
546 | char * command_line; | |
914dcaa8 | 547 | extern const struct kernel_param __start___param[], __stop___param[]; |
033ab7f8 AM |
548 | |
549 | smp_setup_processor_id(); | |
550 | ||
fbb9ce95 IM |
551 | /* |
552 | * Need to run as early as possible, to initialize the | |
553 | * lockdep hash: | |
554 | */ | |
555 | lockdep_init(); | |
3ac7fe5a | 556 | debug_objects_early_init(); |
42059429 IM |
557 | |
558 | /* | |
559 | * Set up the the initial canary ASAP: | |
560 | */ | |
561 | boot_init_stack_canary(); | |
562 | ||
ddbcc7e8 | 563 | cgroup_init_early(); |
fbb9ce95 IM |
564 | |
565 | local_irq_disable(); | |
2ce802f6 | 566 | early_boot_irqs_disabled = true; |
fbb9ce95 | 567 | |
1da177e4 LT |
568 | /* |
569 | * Interrupts are still disabled. Do necessary setups, then | |
570 | * enable them | |
571 | */ | |
906568c9 | 572 | tick_init(); |
44fd2299 | 573 | boot_cpu_init(); |
1da177e4 | 574 | page_address_init(); |
657cafa6 | 575 | printk(KERN_NOTICE "%s", linux_banner); |
1da177e4 | 576 | setup_arch(&command_line); |
cf475ad2 | 577 | mm_init_owner(&init_mm, &init_task); |
30d7e0d4 | 578 | setup_command_line(command_line); |
e0982e90 | 579 | setup_nr_cpu_ids(); |
d6647bdf | 580 | setup_per_cpu_areas(); |
44fd2299 | 581 | smp_prepare_boot_cpu(); /* arch-specific boot-cpu hooks */ |
1da177e4 | 582 | |
1f522509 | 583 | build_all_zonelists(NULL); |
83b519e8 PE |
584 | page_alloc_init(); |
585 | ||
586 | printk(KERN_NOTICE "Kernel command line: %s\n", boot_command_line); | |
587 | parse_early_param(); | |
588 | parse_args("Booting kernel", static_command_line, __start___param, | |
589 | __stop___param - __start___param, | |
590 | &unknown_bootoption); | |
591 | /* | |
592 | * These use large bootmem allocations and must precede | |
593 | * kmem_cache_init() | |
594 | */ | |
595 | pidhash_init(); | |
83b519e8 PE |
596 | vfs_caches_init_early(); |
597 | sort_main_extable(); | |
598 | trap_init(); | |
444f478f | 599 | mm_init(); |
1da177e4 LT |
600 | /* |
601 | * Set up the scheduler prior starting any interrupts (such as the | |
602 | * timer interrupt). Full topology setup happens at smp_init() | |
603 | * time - but meanwhile we still have a functioning scheduler. | |
604 | */ | |
605 | sched_init(); | |
606 | /* | |
607 | * Disable preemption - early bootup scheduling is extremely | |
608 | * fragile until we cpu_idle() for the first time. | |
609 | */ | |
610 | preempt_disable(); | |
c4a68306 AB |
611 | if (!irqs_disabled()) { |
612 | printk(KERN_WARNING "start_kernel(): bug: interrupts were " | |
613 | "enabled *very* early, fixing it\n"); | |
614 | local_irq_disable(); | |
615 | } | |
9f58a205 | 616 | idr_init_cache(); |
24a24bb6 | 617 | perf_event_init(); |
1da177e4 | 618 | rcu_init(); |
773e3eb7 | 619 | radix_tree_init(); |
0b8f1efa YL |
620 | /* init some links before init_ISA_irqs() */ |
621 | early_irq_init(); | |
1da177e4 | 622 | init_IRQ(); |
3c7b4e6b | 623 | prio_tree_init(); |
1da177e4 | 624 | init_timers(); |
c0a31329 | 625 | hrtimers_init(); |
1da177e4 | 626 | softirq_init(); |
ad596171 | 627 | timekeeping_init(); |
88fecaa2 | 628 | time_init(); |
93e02814 HC |
629 | profile_init(); |
630 | if (!irqs_disabled()) | |
24d431d0 RL |
631 | printk(KERN_CRIT "start_kernel(): bug: interrupts were " |
632 | "enabled early\n"); | |
2ce802f6 | 633 | early_boot_irqs_disabled = false; |
93e02814 | 634 | local_irq_enable(); |
dcce284a BH |
635 | |
636 | /* Interrupts are enabled now so all GFP allocations are safe. */ | |
452aa699 | 637 | gfp_allowed_mask = __GFP_BITS_MASK; |
dcce284a | 638 | |
7e85ee0c | 639 | kmem_cache_init_late(); |
1da177e4 LT |
640 | |
641 | /* | |
642 | * HACK ALERT! This is early. We're enabling the console before | |
643 | * we've done PCI setups etc, and console_init() must be aware of | |
644 | * this. But we do want output early, in case something goes wrong. | |
645 | */ | |
646 | console_init(); | |
647 | if (panic_later) | |
648 | panic(panic_later, panic_param); | |
fbb9ce95 IM |
649 | |
650 | lockdep_info(); | |
651 | ||
9a11b49a IM |
652 | /* |
653 | * Need to run this when irqs are enabled, because it wants | |
654 | * to self-test [hard/soft]-irqs on/off lock inversion bugs | |
655 | * too: | |
656 | */ | |
657 | locking_selftest(); | |
658 | ||
1da177e4 LT |
659 | #ifdef CONFIG_BLK_DEV_INITRD |
660 | if (initrd_start && !initrd_below_start_ok && | |
bd673c7c | 661 | page_to_pfn(virt_to_page((void *)initrd_start)) < min_low_pfn) { |
1da177e4 | 662 | printk(KERN_CRIT "initrd overwritten (0x%08lx < 0x%08lx) - " |
fb6624eb | 663 | "disabling it.\n", |
bd673c7c GU |
664 | page_to_pfn(virt_to_page((void *)initrd_start)), |
665 | min_low_pfn); | |
1da177e4 LT |
666 | initrd_start = 0; |
667 | } | |
668 | #endif | |
94b6da5a | 669 | page_cgroup_init(); |
a03c2a48 | 670 | enable_debug_pagealloc(); |
3c7b4e6b | 671 | kmemleak_init(); |
3ac7fe5a | 672 | debug_objects_mem_init(); |
e7c8d5c9 | 673 | setup_per_cpu_pageset(); |
1da177e4 LT |
674 | numa_policy_init(); |
675 | if (late_time_init) | |
676 | late_time_init(); | |
fa84e9ee | 677 | sched_clock_init(); |
1da177e4 LT |
678 | calibrate_delay(); |
679 | pidmap_init(); | |
1da177e4 LT |
680 | anon_vma_init(); |
681 | #ifdef CONFIG_X86 | |
682 | if (efi_enabled) | |
683 | efi_enter_virtual_mode(); | |
684 | #endif | |
8c9843e5 | 685 | thread_info_cache_init(); |
d84f4f99 | 686 | cred_init(); |
4481374c | 687 | fork_init(totalram_pages); |
1da177e4 LT |
688 | proc_caches_init(); |
689 | buffer_init(); | |
1da177e4 LT |
690 | key_init(); |
691 | security_init(); | |
0b4b3827 | 692 | dbg_late_init(); |
4481374c | 693 | vfs_caches_init(totalram_pages); |
1da177e4 LT |
694 | signals_init(); |
695 | /* rootfs populating might need page-writeback */ | |
696 | page_writeback_init(); | |
697 | #ifdef CONFIG_PROC_FS | |
698 | proc_root_init(); | |
699 | #endif | |
ddbcc7e8 | 700 | cgroup_init(); |
1da177e4 | 701 | cpuset_init(); |
c757249a | 702 | taskstats_init_early(); |
ca74e92b | 703 | delayacct_init(); |
1da177e4 LT |
704 | |
705 | check_bugs(); | |
706 | ||
707 | acpi_early_init(); /* before LAPIC and SMP init */ | |
6ae6996a | 708 | sfi_init_late(); |
1da177e4 | 709 | |
68bf21aa SR |
710 | ftrace_init(); |
711 | ||
1da177e4 LT |
712 | /* Do the rest non-__init'ed, we're now alive */ |
713 | rest_init(); | |
714 | } | |
715 | ||
b99b87f7 PO |
716 | /* Call all constructor functions linked into the kernel. */ |
717 | static void __init do_ctors(void) | |
718 | { | |
719 | #ifdef CONFIG_CONSTRUCTORS | |
196a15b4 | 720 | ctor_fn_t *fn = (ctor_fn_t *) __ctors_start; |
b99b87f7 | 721 | |
196a15b4 HS |
722 | for (; fn < (ctor_fn_t *) __ctors_end; fn++) |
723 | (*fn)(); | |
b99b87f7 PO |
724 | #endif |
725 | } | |
726 | ||
22a9d645 | 727 | int initcall_debug; |
d0ea3d7d | 728 | core_param(initcall_debug, initcall_debug, bool, 0644); |
1da177e4 | 729 | |
4a683bf9 | 730 | static char msgbuf[64]; |
4a683bf9 | 731 | |
e4461271 | 732 | static int __init_or_module do_one_initcall_debug(initcall_t fn) |
1da177e4 | 733 | { |
74239072 | 734 | ktime_t calltime, delta, rettime; |
30dbb20e AW |
735 | unsigned long long duration; |
736 | int ret; | |
1da177e4 | 737 | |
22c5c03b KW |
738 | printk(KERN_DEBUG "calling %pF @ %i\n", fn, task_pid_nr(current)); |
739 | calltime = ktime_get(); | |
30dbb20e | 740 | ret = fn(); |
22c5c03b KW |
741 | rettime = ktime_get(); |
742 | delta = ktime_sub(rettime, calltime); | |
743 | duration = (unsigned long long) ktime_to_ns(delta) >> 10; | |
744 | printk(KERN_DEBUG "initcall %pF returned %d after %lld usecs\n", fn, | |
745 | ret, duration); | |
1da177e4 | 746 | |
22c5c03b KW |
747 | return ret; |
748 | } | |
749 | ||
e4461271 | 750 | int __init_or_module do_one_initcall(initcall_t fn) |
22c5c03b KW |
751 | { |
752 | int count = preempt_count(); | |
753 | int ret; | |
754 | ||
755 | if (initcall_debug) | |
756 | ret = do_one_initcall_debug(fn); | |
757 | else | |
758 | ret = fn(); | |
8f0c45cd | 759 | |
e0df154f | 760 | msgbuf[0] = 0; |
e662e1cf | 761 | |
30dbb20e AW |
762 | if (ret && ret != -ENODEV && initcall_debug) |
763 | sprintf(msgbuf, "error code %d ", ret); | |
e662e1cf | 764 | |
e0df154f | 765 | if (preempt_count() != count) { |
a76bfd0d | 766 | strlcat(msgbuf, "preemption imbalance ", sizeof(msgbuf)); |
e0df154f | 767 | preempt_count() = count; |
1da177e4 | 768 | } |
e0df154f | 769 | if (irqs_disabled()) { |
a76bfd0d | 770 | strlcat(msgbuf, "disabled interrupts ", sizeof(msgbuf)); |
e0df154f LT |
771 | local_irq_enable(); |
772 | } | |
773 | if (msgbuf[0]) { | |
96d746c6 | 774 | printk("initcall %pF returned with %s\n", fn, msgbuf); |
e0df154f | 775 | } |
59f9415f | 776 | |
30dbb20e | 777 | return ret; |
e0df154f LT |
778 | } |
779 | ||
780 | ||
c2147a50 | 781 | extern initcall_t __initcall_start[], __initcall_end[], __early_initcall_end[]; |
e0df154f LT |
782 | |
783 | static void __init do_initcalls(void) | |
784 | { | |
196a15b4 | 785 | initcall_t *fn; |
e0df154f | 786 | |
196a15b4 HS |
787 | for (fn = __early_initcall_end; fn < __initcall_end; fn++) |
788 | do_one_initcall(*fn); | |
1da177e4 LT |
789 | } |
790 | ||
791 | /* | |
792 | * Ok, the machine is now initialized. None of the devices | |
793 | * have been touched yet, but the CPU subsystem is up and | |
794 | * running, and memory and process management works. | |
795 | * | |
796 | * Now we can finally start doing some real work.. | |
797 | */ | |
798 | static void __init do_basic_setup(void) | |
799 | { | |
759ee091 | 800 | cpuset_init_smp(); |
1da177e4 | 801 | usermodehelper_init(); |
2b2af54a | 802 | init_tmpfs(); |
1da177e4 | 803 | driver_init(); |
b04c3afb | 804 | init_irq_proc(); |
b99b87f7 | 805 | do_ctors(); |
1da177e4 LT |
806 | do_initcalls(); |
807 | } | |
808 | ||
7babe8db | 809 | static void __init do_pre_smp_initcalls(void) |
c2147a50 | 810 | { |
196a15b4 | 811 | initcall_t *fn; |
c2147a50 | 812 | |
196a15b4 HS |
813 | for (fn = __initcall_start; fn < __early_initcall_end; fn++) |
814 | do_one_initcall(*fn); | |
c2147a50 EGM |
815 | } |
816 | ||
d7627467 | 817 | static void run_init_process(const char *init_filename) |
1da177e4 LT |
818 | { |
819 | argv_init[0] = init_filename; | |
67608567 | 820 | kernel_execve(init_filename, argv_init, envp_init); |
1da177e4 LT |
821 | } |
822 | ||
ee5bfa64 VG |
823 | /* This is a non __init function. Force it to be noinline otherwise gcc |
824 | * makes it inline to init() and it becomes part of init.text section | |
825 | */ | |
f99ebf0a | 826 | static noinline int init_post(void) |
ee5bfa64 | 827 | { |
22a9d645 AV |
828 | /* need to finish all async __init code before freeing the memory */ |
829 | async_synchronize_full(); | |
ee5bfa64 | 830 | free_initmem(); |
ee5bfa64 VG |
831 | mark_rodata_ro(); |
832 | system_state = SYSTEM_RUNNING; | |
833 | numa_default_policy(); | |
834 | ||
ee5bfa64 | 835 | |
fae5fa44 ON |
836 | current->signal->flags |= SIGNAL_UNKILLABLE; |
837 | ||
ee5bfa64 VG |
838 | if (ramdisk_execute_command) { |
839 | run_init_process(ramdisk_execute_command); | |
840 | printk(KERN_WARNING "Failed to execute %s\n", | |
841 | ramdisk_execute_command); | |
842 | } | |
843 | ||
844 | /* | |
845 | * We try each of these until one succeeds. | |
846 | * | |
847 | * The Bourne shell can be used instead of init if we are | |
848 | * trying to recover a really broken machine. | |
849 | */ | |
850 | if (execute_command) { | |
851 | run_init_process(execute_command); | |
852 | printk(KERN_WARNING "Failed to execute %s. Attempting " | |
853 | "defaults...\n", execute_command); | |
854 | } | |
855 | run_init_process("/sbin/init"); | |
856 | run_init_process("/etc/init"); | |
857 | run_init_process("/bin/init"); | |
858 | run_init_process("/bin/sh"); | |
859 | ||
9a85b8d6 AM |
860 | panic("No init found. Try passing init= option to kernel. " |
861 | "See Linux Documentation/init.txt for guidance."); | |
ee5bfa64 VG |
862 | } |
863 | ||
aae5f662 | 864 | static int __init kernel_init(void * unused) |
1da177e4 | 865 | { |
b433c3d4 PZ |
866 | /* |
867 | * Wait until kthreadd is all set-up. | |
868 | */ | |
869 | wait_for_completion(&kthreadd_done); | |
58568d2a MX |
870 | /* |
871 | * init can allocate pages on any node | |
872 | */ | |
5ab116c9 | 873 | set_mems_allowed(node_states[N_HIGH_MEMORY]); |
1da177e4 LT |
874 | /* |
875 | * init can run on any cpu. | |
876 | */ | |
1a2142af | 877 | set_cpus_allowed_ptr(current, cpu_all_mask); |
1da177e4 LT |
878 | /* |
879 | * Tell the world that we're going to be the grim | |
880 | * reaper of innocent orphaned children. | |
881 | * | |
882 | * We don't want people to have to make incorrect | |
883 | * assumptions about where in the task array this | |
884 | * can be found. | |
885 | */ | |
84d73786 | 886 | init_pid_ns.child_reaper = current; |
1da177e4 | 887 | |
9ec52099 CLG |
888 | cad_pid = task_pid(current); |
889 | ||
ca74a6f8 | 890 | smp_prepare_cpus(setup_max_cpus); |
1da177e4 LT |
891 | |
892 | do_pre_smp_initcalls(); | |
004417a6 | 893 | lockup_detector_init(); |
1da177e4 | 894 | |
1da177e4 LT |
895 | smp_init(); |
896 | sched_init_smp(); | |
897 | ||
1da177e4 LT |
898 | do_basic_setup(); |
899 | ||
2bd3a997 EB |
900 | /* Open the /dev/console on the rootfs, this should never fail */ |
901 | if (sys_open((const char __user *) "/dev/console", O_RDWR, 0) < 0) | |
902 | printk(KERN_WARNING "Warning: unable to open an initial console.\n"); | |
903 | ||
904 | (void) sys_dup(0); | |
905 | (void) sys_dup(0); | |
1da177e4 LT |
906 | /* |
907 | * check if there is an early userspace init. If yes, let it do all | |
908 | * the work | |
909 | */ | |
ffdfc409 OJ |
910 | |
911 | if (!ramdisk_execute_command) | |
912 | ramdisk_execute_command = "/init"; | |
913 | ||
914 | if (sys_access((const char __user *) ramdisk_execute_command, 0) != 0) { | |
915 | ramdisk_execute_command = NULL; | |
1da177e4 | 916 | prepare_namespace(); |
ffdfc409 | 917 | } |
1da177e4 LT |
918 | |
919 | /* | |
920 | * Ok, we have completed the initial bootup, and | |
921 | * we're essentially up and running. Get rid of the | |
922 | * initmem segments and start the user-mode stuff.. | |
923 | */ | |
71566a0d | 924 | |
ee5bfa64 VG |
925 | init_post(); |
926 | return 0; | |
1da177e4 | 927 | } |