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 | ||
ea676e84 AM |
12 | #define DEBUG /* Enable initcall_debug */ |
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> | |
9b5609fd | 19 | #include <linux/stackprotector.h> |
1da177e4 LT |
20 | #include <linux/string.h> |
21 | #include <linux/ctype.h> | |
22 | #include <linux/delay.h> | |
1da177e4 LT |
23 | #include <linux/ioport.h> |
24 | #include <linux/init.h> | |
1da177e4 | 25 | #include <linux/initrd.h> |
1da177e4 | 26 | #include <linux/bootmem.h> |
4a7a16dc | 27 | #include <linux/acpi.h> |
1da177e4 | 28 | #include <linux/tty.h> |
1da177e4 LT |
29 | #include <linux/percpu.h> |
30 | #include <linux/kmod.h> | |
db64fe02 | 31 | #include <linux/vmalloc.h> |
1da177e4 | 32 | #include <linux/kernel_stat.h> |
d7cd5611 | 33 | #include <linux/start_kernel.h> |
1da177e4 | 34 | #include <linux/security.h> |
3d442233 | 35 | #include <linux/smp.h> |
1da177e4 LT |
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> | |
ddbcc7e8 | 43 | #include <linux/cgroup.h> |
1da177e4 | 44 | #include <linux/efi.h> |
906568c9 | 45 | #include <linux/tick.h> |
6168a702 | 46 | #include <linux/interrupt.h> |
c757249a | 47 | #include <linux/taskstats_kern.h> |
ca74e92b | 48 | #include <linux/delayacct.h> |
1da177e4 LT |
49 | #include <linux/unistd.h> |
50 | #include <linux/rmap.h> | |
51 | #include <linux/mempolicy.h> | |
52 | #include <linux/key.h> | |
b6cd0b77 | 53 | #include <linux/buffer_head.h> |
94b6da5a | 54 | #include <linux/page_cgroup.h> |
9a11b49a | 55 | #include <linux/debug_locks.h> |
3ac7fe5a | 56 | #include <linux/debugobjects.h> |
fbb9ce95 | 57 | #include <linux/lockdep.h> |
3c7b4e6b | 58 | #include <linux/kmemleak.h> |
84d73786 | 59 | #include <linux/pid_namespace.h> |
1f21782e | 60 | #include <linux/device.h> |
73c27992 | 61 | #include <linux/kthread.h> |
e6fe6649 | 62 | #include <linux/sched.h> |
a1c9eea9 | 63 | #include <linux/signal.h> |
199f0ca5 | 64 | #include <linux/idr.h> |
0b4b3827 | 65 | #include <linux/kgdb.h> |
68bf21aa | 66 | #include <linux/ftrace.h> |
22a9d645 | 67 | #include <linux/async.h> |
dfec072e | 68 | #include <linux/kmemcheck.h> |
6ae6996a | 69 | #include <linux/sfi.h> |
2b2af54a | 70 | #include <linux/shmem_fs.h> |
5a0e3ad6 | 71 | #include <linux/slab.h> |
24a24bb6 | 72 | #include <linux/perf_event.h> |
4a9d4b02 | 73 | #include <linux/file.h> |
a74fb73c | 74 | #include <linux/ptrace.h> |
bb813f4c TH |
75 | #include <linux/blkdev.h> |
76 | #include <linux/elevator.h> | |
b7a52f51 | 77 | #include <linux/random.h> |
1da177e4 LT |
78 | |
79 | #include <asm/io.h> | |
80 | #include <asm/bugs.h> | |
81 | #include <asm/setup.h> | |
a940199f | 82 | #include <asm/sections.h> |
37b73c82 | 83 | #include <asm/cacheflush.h> |
1da177e4 | 84 | |
1da177e4 LT |
85 | #ifdef CONFIG_X86_LOCAL_APIC |
86 | #include <asm/smp.h> | |
87 | #endif | |
88 | ||
aae5f662 | 89 | static int kernel_init(void *); |
1da177e4 LT |
90 | |
91 | extern void init_IRQ(void); | |
1da177e4 LT |
92 | extern void fork_init(unsigned long); |
93 | extern void mca_init(void); | |
94 | extern void sbus_init(void); | |
1da177e4 | 95 | extern void radix_tree_init(void); |
37b73c82 AV |
96 | #ifndef CONFIG_DEBUG_RODATA |
97 | static inline void mark_rodata_ro(void) { } | |
98 | #endif | |
1da177e4 LT |
99 | |
100 | #ifdef CONFIG_TC | |
101 | extern void tc_init(void); | |
102 | #endif | |
103 | ||
2ce802f6 TH |
104 | /* |
105 | * Debug helper: via this flag we know that we are in 'early bootup code' | |
106 | * where only the boot processor is running with IRQ disabled. This means | |
107 | * two things - IRQ must not be enabled before the flag is cleared and some | |
108 | * operations which are not allowed with IRQ disabled are allowed while the | |
109 | * flag is set. | |
110 | */ | |
111 | bool early_boot_irqs_disabled __read_mostly; | |
112 | ||
a6826048 | 113 | enum system_states system_state __read_mostly; |
1da177e4 LT |
114 | EXPORT_SYMBOL(system_state); |
115 | ||
116 | /* | |
117 | * Boot command-line arguments | |
118 | */ | |
119 | #define MAX_INIT_ARGS CONFIG_INIT_ENV_ARG_LIMIT | |
120 | #define MAX_INIT_ENVS CONFIG_INIT_ENV_ARG_LIMIT | |
121 | ||
122 | extern void time_init(void); | |
123 | /* Default late time init is NULL. archs can override this later. */ | |
d2e3192b | 124 | void (*__initdata late_time_init)(void); |
1da177e4 LT |
125 | extern void softirq_init(void); |
126 | ||
30d7e0d4 ABL |
127 | /* Untouched command line saved by arch-specific code. */ |
128 | char __initdata boot_command_line[COMMAND_LINE_SIZE]; | |
129 | /* Untouched saved command line (eg. for /proc) */ | |
130 | char *saved_command_line; | |
131 | /* Command line for parameter parsing */ | |
132 | static char *static_command_line; | |
1da177e4 LT |
133 | |
134 | static char *execute_command; | |
ffdfc409 | 135 | static char *ramdisk_execute_command; |
1da177e4 | 136 | |
8b3b2955 JB |
137 | /* |
138 | * If set, this is an indication to the drivers that reset the underlying | |
139 | * device before going ahead with the initialization otherwise driver might | |
140 | * rely on the BIOS and skip the reset operation. | |
141 | * | |
142 | * This is useful if kernel is booting in an unreliable environment. | |
143 | * For ex. kdump situaiton where previous kernel has crashed, BIOS has been | |
144 | * skipped and devices will be in unknown state. | |
145 | */ | |
146 | unsigned int reset_devices; | |
147 | EXPORT_SYMBOL(reset_devices); | |
1da177e4 | 148 | |
7e96287d VG |
149 | static int __init set_reset_devices(char *str) |
150 | { | |
151 | reset_devices = 1; | |
152 | return 1; | |
153 | } | |
154 | ||
155 | __setup("reset_devices", set_reset_devices); | |
156 | ||
d7627467 DH |
157 | static const char * argv_init[MAX_INIT_ARGS+2] = { "init", NULL, }; |
158 | const char * envp_init[MAX_INIT_ENVS+2] = { "HOME=/", "TERM=linux", NULL, }; | |
1da177e4 LT |
159 | static const char *panic_later, *panic_param; |
160 | ||
914dcaa8 | 161 | extern const struct obs_kernel_param __setup_start[], __setup_end[]; |
1da177e4 LT |
162 | |
163 | static int __init obsolete_checksetup(char *line) | |
164 | { | |
914dcaa8 | 165 | const struct obs_kernel_param *p; |
33df0d19 | 166 | int had_early_param = 0; |
1da177e4 LT |
167 | |
168 | p = __setup_start; | |
169 | do { | |
170 | int n = strlen(p->str); | |
b1e4d20c | 171 | if (parameqn(line, p->str, n)) { |
1da177e4 | 172 | if (p->early) { |
33df0d19 RR |
173 | /* Already done in parse_early_param? |
174 | * (Needs exact match on param part). | |
175 | * Keep iterating, as we can have early | |
176 | * params and __setups of same names 8( */ | |
1da177e4 | 177 | if (line[n] == '\0' || line[n] == '=') |
33df0d19 | 178 | had_early_param = 1; |
1da177e4 | 179 | } else if (!p->setup_func) { |
ea676e84 AM |
180 | pr_warn("Parameter %s is obsolete, ignored\n", |
181 | p->str); | |
1da177e4 LT |
182 | return 1; |
183 | } else if (p->setup_func(line + n)) | |
184 | return 1; | |
185 | } | |
186 | p++; | |
187 | } while (p < __setup_end); | |
33df0d19 RR |
188 | |
189 | return had_early_param; | |
1da177e4 LT |
190 | } |
191 | ||
192 | /* | |
193 | * This should be approx 2 Bo*oMips to start (note initial shift), and will | |
194 | * still work even if initially too large, it will just take slightly longer | |
195 | */ | |
196 | unsigned long loops_per_jiffy = (1<<12); | |
197 | ||
198 | EXPORT_SYMBOL(loops_per_jiffy); | |
199 | ||
200 | static int __init debug_kernel(char *str) | |
201 | { | |
1da177e4 | 202 | console_loglevel = 10; |
f6f21c81 | 203 | return 0; |
1da177e4 LT |
204 | } |
205 | ||
206 | static int __init quiet_kernel(char *str) | |
207 | { | |
1da177e4 | 208 | console_loglevel = 4; |
f6f21c81 | 209 | return 0; |
1da177e4 LT |
210 | } |
211 | ||
f6f21c81 YL |
212 | early_param("debug", debug_kernel); |
213 | early_param("quiet", quiet_kernel); | |
1da177e4 LT |
214 | |
215 | static int __init loglevel(char *str) | |
216 | { | |
808bf29b AS |
217 | int newlevel; |
218 | ||
219 | /* | |
220 | * Only update loglevel value when a correct setting was passed, | |
221 | * to prevent blind crashes (when loglevel being set to 0) that | |
222 | * are quite hard to debug | |
223 | */ | |
224 | if (get_option(&str, &newlevel)) { | |
225 | console_loglevel = newlevel; | |
226 | return 0; | |
227 | } | |
228 | ||
229 | return -EINVAL; | |
1da177e4 LT |
230 | } |
231 | ||
f6f21c81 | 232 | early_param("loglevel", loglevel); |
1da177e4 | 233 | |
a99cd112 | 234 | /* Change NUL term back to "=", to make "param" the whole string. */ |
eb157427 | 235 | static int __init repair_env_string(char *param, char *val, const char *unused) |
1da177e4 | 236 | { |
1da177e4 LT |
237 | if (val) { |
238 | /* param=val or param="val"? */ | |
239 | if (val == param+strlen(param)+1) | |
240 | val[-1] = '='; | |
241 | else if (val == param+strlen(param)+2) { | |
242 | val[-2] = '='; | |
243 | memmove(val-1, val, strlen(val)+1); | |
244 | val--; | |
245 | } else | |
246 | BUG(); | |
247 | } | |
a99cd112 CM |
248 | return 0; |
249 | } | |
250 | ||
251 | /* | |
252 | * Unknown boot options get handed to init, unless they look like | |
253 | * unused parameters (modprobe will find them in /proc/cmdline). | |
254 | */ | |
eb157427 | 255 | static int __init unknown_bootoption(char *param, char *val, const char *unused) |
a99cd112 | 256 | { |
eb157427 | 257 | repair_env_string(param, val, unused); |
1da177e4 LT |
258 | |
259 | /* Handle obsolete-style parameters */ | |
260 | if (obsolete_checksetup(param)) | |
261 | return 0; | |
262 | ||
f066a4f6 RR |
263 | /* Unused module parameter. */ |
264 | if (strchr(param, '.') && (!val || strchr(param, '.') < val)) | |
1da177e4 | 265 | return 0; |
1da177e4 LT |
266 | |
267 | if (panic_later) | |
268 | return 0; | |
269 | ||
270 | if (val) { | |
271 | /* Environment option */ | |
272 | unsigned int i; | |
273 | for (i = 0; envp_init[i]; i++) { | |
274 | if (i == MAX_INIT_ENVS) { | |
275 | panic_later = "Too many boot env vars at `%s'"; | |
276 | panic_param = param; | |
277 | } | |
278 | if (!strncmp(param, envp_init[i], val - param)) | |
279 | break; | |
280 | } | |
281 | envp_init[i] = param; | |
282 | } else { | |
283 | /* Command line option */ | |
284 | unsigned int i; | |
285 | for (i = 0; argv_init[i]; i++) { | |
286 | if (i == MAX_INIT_ARGS) { | |
287 | panic_later = "Too many boot init vars at `%s'"; | |
288 | panic_param = param; | |
289 | } | |
290 | } | |
291 | argv_init[i] = param; | |
292 | } | |
293 | return 0; | |
294 | } | |
295 | ||
296 | static int __init init_setup(char *str) | |
297 | { | |
298 | unsigned int i; | |
299 | ||
300 | execute_command = str; | |
301 | /* | |
302 | * In case LILO is going to boot us with default command line, | |
303 | * it prepends "auto" before the whole cmdline which makes | |
304 | * the shell think it should execute a script with such name. | |
305 | * So we ignore all arguments entered _before_ init=... [MJ] | |
306 | */ | |
307 | for (i = 1; i < MAX_INIT_ARGS; i++) | |
308 | argv_init[i] = NULL; | |
309 | return 1; | |
310 | } | |
311 | __setup("init=", init_setup); | |
312 | ||
ffdfc409 OJ |
313 | static int __init rdinit_setup(char *str) |
314 | { | |
315 | unsigned int i; | |
316 | ||
317 | ramdisk_execute_command = str; | |
318 | /* See "auto" comment in init_setup */ | |
319 | for (i = 1; i < MAX_INIT_ARGS; i++) | |
320 | argv_init[i] = NULL; | |
321 | return 1; | |
322 | } | |
323 | __setup("rdinit=", rdinit_setup); | |
324 | ||
1da177e4 | 325 | #ifndef CONFIG_SMP |
34db18a0 | 326 | static const unsigned int setup_max_cpus = NR_CPUS; |
1da177e4 LT |
327 | #ifdef CONFIG_X86_LOCAL_APIC |
328 | static void __init smp_init(void) | |
329 | { | |
330 | APIC_init_uniprocessor(); | |
331 | } | |
332 | #else | |
333 | #define smp_init() do { } while (0) | |
334 | #endif | |
335 | ||
e0982e90 | 336 | static inline void setup_nr_cpu_ids(void) { } |
1da177e4 | 337 | static inline void smp_prepare_cpus(unsigned int maxcpus) { } |
1da177e4 LT |
338 | #endif |
339 | ||
30d7e0d4 ABL |
340 | /* |
341 | * We need to store the untouched command line for future reference. | |
342 | * We also need to store the touched command line since the parameter | |
343 | * parsing is performed in place, and we should allow a component to | |
344 | * store reference of name/value for future reference. | |
345 | */ | |
346 | static void __init setup_command_line(char *command_line) | |
347 | { | |
348 | saved_command_line = alloc_bootmem(strlen (boot_command_line)+1); | |
349 | static_command_line = alloc_bootmem(strlen (command_line)+1); | |
350 | strcpy (saved_command_line, boot_command_line); | |
351 | strcpy (static_command_line, command_line); | |
352 | } | |
353 | ||
1da177e4 LT |
354 | /* |
355 | * We need to finalize in a non-__init function or else race conditions | |
356 | * between the root thread and the init thread may cause start_kernel to | |
357 | * be reaped by free_initmem before the root thread has proceeded to | |
358 | * cpu_idle. | |
359 | * | |
360 | * gcc-3.4 accidentally inlines this function, so use noinline. | |
361 | */ | |
362 | ||
b433c3d4 PZ |
363 | static __initdata DECLARE_COMPLETION(kthreadd_done); |
364 | ||
f99ebf0a | 365 | static noinline void __init_refok rest_init(void) |
1da177e4 | 366 | { |
73c27992 EB |
367 | int pid; |
368 | ||
7db905e6 | 369 | rcu_scheduler_starting(); |
b433c3d4 | 370 | /* |
97158569 | 371 | * We need to spawn init first so that it obtains pid 1, however |
b433c3d4 PZ |
372 | * the init task will end up wanting to create kthreads, which, if |
373 | * we schedule it before we create kthreadd, will OOPS. | |
374 | */ | |
aae5f662 | 375 | kernel_thread(kernel_init, NULL, CLONE_FS | CLONE_SIGHAND); |
1da177e4 | 376 | numa_default_policy(); |
73c27992 | 377 | pid = kernel_thread(kthreadd, NULL, CLONE_FS | CLONE_FILES); |
d11c563d | 378 | rcu_read_lock(); |
5cd20455 | 379 | kthreadd_task = find_task_by_pid_ns(pid, &init_pid_ns); |
d11c563d | 380 | rcu_read_unlock(); |
b433c3d4 | 381 | complete(&kthreadd_done); |
f340c0d1 IM |
382 | |
383 | /* | |
384 | * The boot idle thread must execute schedule() | |
1df21055 | 385 | * at least once to get things moving: |
f340c0d1 | 386 | */ |
1df21055 | 387 | init_idle_bootup_task(current); |
bd2f5536 | 388 | schedule_preempt_disabled(); |
5bfb5d69 | 389 | /* Call into cpu_idle with preempt disabled */ |
a1a04ec3 | 390 | cpu_startup_entry(CPUHP_ONLINE); |
1df21055 | 391 | } |
1da177e4 LT |
392 | |
393 | /* Check for early params. */ | |
9fb48c74 | 394 | static int __init do_early_param(char *param, char *val, const char *unused) |
1da177e4 | 395 | { |
914dcaa8 | 396 | const struct obs_kernel_param *p; |
1da177e4 LT |
397 | |
398 | for (p = __setup_start; p < __setup_end; p++) { | |
b1e4d20c | 399 | if ((p->early && parameq(param, p->str)) || |
18a8bd94 YL |
400 | (strcmp(param, "console") == 0 && |
401 | strcmp(p->str, "earlycon") == 0) | |
402 | ) { | |
1da177e4 | 403 | if (p->setup_func(val) != 0) |
ea676e84 | 404 | pr_warn("Malformed early option '%s'\n", param); |
1da177e4 LT |
405 | } |
406 | } | |
407 | /* We accept everything at this stage. */ | |
408 | return 0; | |
409 | } | |
410 | ||
13977091 MD |
411 | void __init parse_early_options(char *cmdline) |
412 | { | |
026cee00 | 413 | parse_args("early options", cmdline, NULL, 0, 0, 0, do_early_param); |
13977091 MD |
414 | } |
415 | ||
1da177e4 LT |
416 | /* Arch code calls this early on, or if not, just before other parsing. */ |
417 | void __init parse_early_param(void) | |
418 | { | |
419 | static __initdata int done = 0; | |
420 | static __initdata char tmp_cmdline[COMMAND_LINE_SIZE]; | |
421 | ||
422 | if (done) | |
423 | return; | |
424 | ||
425 | /* All fall through to do_early_param. */ | |
30d7e0d4 | 426 | strlcpy(tmp_cmdline, boot_command_line, COMMAND_LINE_SIZE); |
13977091 | 427 | parse_early_options(tmp_cmdline); |
1da177e4 LT |
428 | done = 1; |
429 | } | |
430 | ||
431 | /* | |
432 | * Activate the first processor. | |
433 | */ | |
434 | ||
44fd2299 SS |
435 | static void __init boot_cpu_init(void) |
436 | { | |
437 | int cpu = smp_processor_id(); | |
438 | /* Mark the boot cpu "present", "online" etc for SMP and UP case */ | |
915441b6 | 439 | set_cpu_online(cpu, true); |
933b0618 | 440 | set_cpu_active(cpu, true); |
915441b6 RR |
441 | set_cpu_present(cpu, true); |
442 | set_cpu_possible(cpu, true); | |
44fd2299 SS |
443 | } |
444 | ||
839ad62e | 445 | void __init __weak smp_setup_processor_id(void) |
033ab7f8 AM |
446 | { |
447 | } | |
448 | ||
eded09cc | 449 | # if THREAD_SIZE >= PAGE_SIZE |
8c9843e5 BH |
450 | void __init __weak thread_info_cache_init(void) |
451 | { | |
452 | } | |
eded09cc | 453 | #endif |
8c9843e5 | 454 | |
444f478f PE |
455 | /* |
456 | * Set up kernel memory allocators | |
457 | */ | |
458 | static void __init mm_init(void) | |
459 | { | |
ca371c0d | 460 | /* |
7fa87ce7 JC |
461 | * page_cgroup requires contiguous pages, |
462 | * bigger than MAX_ORDER unless SPARSEMEM. | |
ca371c0d KH |
463 | */ |
464 | page_cgroup_init_flatmem(); | |
444f478f PE |
465 | mem_init(); |
466 | kmem_cache_init(); | |
099a19d9 | 467 | percpu_init_late(); |
c868d550 | 468 | pgtable_cache_init(); |
444f478f PE |
469 | vmalloc_init(); |
470 | } | |
471 | ||
1da177e4 LT |
472 | asmlinkage void __init start_kernel(void) |
473 | { | |
474 | char * command_line; | |
914dcaa8 | 475 | extern const struct kernel_param __start___param[], __stop___param[]; |
033ab7f8 | 476 | |
fbb9ce95 IM |
477 | /* |
478 | * Need to run as early as possible, to initialize the | |
479 | * lockdep hash: | |
480 | */ | |
481 | lockdep_init(); | |
73839c5b | 482 | smp_setup_processor_id(); |
3ac7fe5a | 483 | debug_objects_early_init(); |
42059429 IM |
484 | |
485 | /* | |
486 | * Set up the the initial canary ASAP: | |
487 | */ | |
488 | boot_init_stack_canary(); | |
489 | ||
ddbcc7e8 | 490 | cgroup_init_early(); |
fbb9ce95 IM |
491 | |
492 | local_irq_disable(); | |
2ce802f6 | 493 | early_boot_irqs_disabled = true; |
fbb9ce95 | 494 | |
1da177e4 LT |
495 | /* |
496 | * Interrupts are still disabled. Do necessary setups, then | |
497 | * enable them | |
498 | */ | |
44fd2299 | 499 | boot_cpu_init(); |
1da177e4 | 500 | page_address_init(); |
ea676e84 | 501 | pr_notice("%s", linux_banner); |
1da177e4 | 502 | setup_arch(&command_line); |
cf475ad2 | 503 | mm_init_owner(&init_mm, &init_task); |
6345d24d | 504 | mm_init_cpumask(&init_mm); |
30d7e0d4 | 505 | setup_command_line(command_line); |
e0982e90 | 506 | setup_nr_cpu_ids(); |
d6647bdf | 507 | setup_per_cpu_areas(); |
44fd2299 | 508 | smp_prepare_boot_cpu(); /* arch-specific boot-cpu hooks */ |
1da177e4 | 509 | |
9adb62a5 | 510 | build_all_zonelists(NULL, NULL); |
83b519e8 PE |
511 | page_alloc_init(); |
512 | ||
ea676e84 | 513 | pr_notice("Kernel command line: %s\n", boot_command_line); |
83b519e8 PE |
514 | parse_early_param(); |
515 | parse_args("Booting kernel", static_command_line, __start___param, | |
516 | __stop___param - __start___param, | |
ae82fdb1 | 517 | -1, -1, &unknown_bootoption); |
97ce2c88 JF |
518 | |
519 | jump_label_init(); | |
520 | ||
83b519e8 PE |
521 | /* |
522 | * These use large bootmem allocations and must precede | |
523 | * kmem_cache_init() | |
524 | */ | |
162a7e75 | 525 | setup_log_buf(0); |
83b519e8 | 526 | pidhash_init(); |
83b519e8 PE |
527 | vfs_caches_init_early(); |
528 | sort_main_extable(); | |
529 | trap_init(); | |
444f478f | 530 | mm_init(); |
de03c72c | 531 | |
1da177e4 LT |
532 | /* |
533 | * Set up the scheduler prior starting any interrupts (such as the | |
534 | * timer interrupt). Full topology setup happens at smp_init() | |
535 | * time - but meanwhile we still have a functioning scheduler. | |
536 | */ | |
537 | sched_init(); | |
538 | /* | |
539 | * Disable preemption - early bootup scheduling is extremely | |
540 | * fragile until we cpu_idle() for the first time. | |
541 | */ | |
542 | preempt_disable(); | |
f91eb62f | 543 | if (WARN(!irqs_disabled(), "Interrupts were enabled *very* early, fixing it\n")) |
c4a68306 | 544 | local_irq_disable(); |
9f58a205 | 545 | idr_init_cache(); |
24a24bb6 | 546 | perf_event_init(); |
1da177e4 | 547 | rcu_init(); |
d1e43fa5 | 548 | tick_nohz_init(); |
773e3eb7 | 549 | radix_tree_init(); |
0b8f1efa YL |
550 | /* init some links before init_ISA_irqs() */ |
551 | early_irq_init(); | |
1da177e4 | 552 | init_IRQ(); |
ad2b1353 | 553 | tick_init(); |
1da177e4 | 554 | init_timers(); |
c0a31329 | 555 | hrtimers_init(); |
1da177e4 | 556 | softirq_init(); |
ad596171 | 557 | timekeeping_init(); |
88fecaa2 | 558 | time_init(); |
93e02814 | 559 | profile_init(); |
d8ad7d11 | 560 | call_function_init(); |
f91eb62f | 561 | WARN(!irqs_disabled(), "Interrupts were enabled early\n"); |
2ce802f6 | 562 | early_boot_irqs_disabled = false; |
93e02814 | 563 | local_irq_enable(); |
dcce284a | 564 | |
7e85ee0c | 565 | kmem_cache_init_late(); |
1da177e4 LT |
566 | |
567 | /* | |
568 | * HACK ALERT! This is early. We're enabling the console before | |
569 | * we've done PCI setups etc, and console_init() must be aware of | |
570 | * this. But we do want output early, in case something goes wrong. | |
571 | */ | |
572 | console_init(); | |
573 | if (panic_later) | |
574 | panic(panic_later, panic_param); | |
fbb9ce95 IM |
575 | |
576 | lockdep_info(); | |
577 | ||
9a11b49a IM |
578 | /* |
579 | * Need to run this when irqs are enabled, because it wants | |
580 | * to self-test [hard/soft]-irqs on/off lock inversion bugs | |
581 | * too: | |
582 | */ | |
583 | locking_selftest(); | |
584 | ||
1da177e4 LT |
585 | #ifdef CONFIG_BLK_DEV_INITRD |
586 | if (initrd_start && !initrd_below_start_ok && | |
bd673c7c | 587 | page_to_pfn(virt_to_page((void *)initrd_start)) < min_low_pfn) { |
ea676e84 | 588 | pr_crit("initrd overwritten (0x%08lx < 0x%08lx) - disabling it.\n", |
bd673c7c GU |
589 | page_to_pfn(virt_to_page((void *)initrd_start)), |
590 | min_low_pfn); | |
1da177e4 LT |
591 | initrd_start = 0; |
592 | } | |
593 | #endif | |
94b6da5a | 594 | page_cgroup_init(); |
3ac7fe5a | 595 | debug_objects_mem_init(); |
9b090f2d | 596 | kmemleak_init(); |
e7c8d5c9 | 597 | setup_per_cpu_pageset(); |
1da177e4 LT |
598 | numa_policy_init(); |
599 | if (late_time_init) | |
600 | late_time_init(); | |
fa84e9ee | 601 | sched_clock_init(); |
1da177e4 LT |
602 | calibrate_delay(); |
603 | pidmap_init(); | |
1da177e4 | 604 | anon_vma_init(); |
11520e5e | 605 | #ifdef CONFIG_X86 |
83e68189 | 606 | if (efi_enabled(EFI_RUNTIME_SERVICES)) |
11520e5e | 607 | efi_enter_virtual_mode(); |
a7b854c9 | 608 | #endif |
cd4033c9 | 609 | #ifdef CONFIG_X86_ESPFIX64 |
a7b854c9 PA |
610 | /* Should be run before the first non-init thread is created */ |
611 | init_espfix_bsp(); | |
11520e5e | 612 | #endif |
8c9843e5 | 613 | thread_info_cache_init(); |
d84f4f99 | 614 | cred_init(); |
4481374c | 615 | fork_init(totalram_pages); |
1da177e4 LT |
616 | proc_caches_init(); |
617 | buffer_init(); | |
1da177e4 LT |
618 | key_init(); |
619 | security_init(); | |
0b4b3827 | 620 | dbg_late_init(); |
4481374c | 621 | vfs_caches_init(totalram_pages); |
1da177e4 LT |
622 | signals_init(); |
623 | /* rootfs populating might need page-writeback */ | |
624 | page_writeback_init(); | |
625 | #ifdef CONFIG_PROC_FS | |
626 | proc_root_init(); | |
627 | #endif | |
ddbcc7e8 | 628 | cgroup_init(); |
1da177e4 | 629 | cpuset_init(); |
c757249a | 630 | taskstats_init_early(); |
ca74e92b | 631 | delayacct_init(); |
1da177e4 LT |
632 | |
633 | check_bugs(); | |
634 | ||
635 | acpi_early_init(); /* before LAPIC and SMP init */ | |
6ae6996a | 636 | sfi_init_late(); |
1da177e4 | 637 | |
83e68189 | 638 | if (efi_enabled(EFI_RUNTIME_SERVICES)) { |
2223af38 | 639 | efi_late_init(); |
78510792 | 640 | efi_free_boot_services(); |
2223af38 | 641 | } |
78510792 | 642 | |
68bf21aa SR |
643 | ftrace_init(); |
644 | ||
1da177e4 LT |
645 | /* Do the rest non-__init'ed, we're now alive */ |
646 | rest_init(); | |
647 | } | |
648 | ||
b99b87f7 PO |
649 | /* Call all constructor functions linked into the kernel. */ |
650 | static void __init do_ctors(void) | |
651 | { | |
652 | #ifdef CONFIG_CONSTRUCTORS | |
196a15b4 | 653 | ctor_fn_t *fn = (ctor_fn_t *) __ctors_start; |
b99b87f7 | 654 | |
196a15b4 HS |
655 | for (; fn < (ctor_fn_t *) __ctors_end; fn++) |
656 | (*fn)(); | |
b99b87f7 PO |
657 | #endif |
658 | } | |
659 | ||
2329abfa | 660 | bool initcall_debug; |
d0ea3d7d | 661 | core_param(initcall_debug, initcall_debug, bool, 0644); |
1da177e4 | 662 | |
4a683bf9 | 663 | static char msgbuf[64]; |
4a683bf9 | 664 | |
e4461271 | 665 | static int __init_or_module do_one_initcall_debug(initcall_t fn) |
1da177e4 | 666 | { |
74239072 | 667 | ktime_t calltime, delta, rettime; |
30dbb20e AW |
668 | unsigned long long duration; |
669 | int ret; | |
1da177e4 | 670 | |
ea676e84 | 671 | pr_debug("calling %pF @ %i\n", fn, task_pid_nr(current)); |
22c5c03b | 672 | calltime = ktime_get(); |
30dbb20e | 673 | ret = fn(); |
22c5c03b KW |
674 | rettime = ktime_get(); |
675 | delta = ktime_sub(rettime, calltime); | |
676 | duration = (unsigned long long) ktime_to_ns(delta) >> 10; | |
ea676e84 AM |
677 | pr_debug("initcall %pF returned %d after %lld usecs\n", |
678 | fn, ret, duration); | |
1da177e4 | 679 | |
22c5c03b KW |
680 | return ret; |
681 | } | |
682 | ||
e4461271 | 683 | int __init_or_module do_one_initcall(initcall_t fn) |
22c5c03b KW |
684 | { |
685 | int count = preempt_count(); | |
686 | int ret; | |
687 | ||
688 | if (initcall_debug) | |
689 | ret = do_one_initcall_debug(fn); | |
690 | else | |
691 | ret = fn(); | |
8f0c45cd | 692 | |
e0df154f | 693 | msgbuf[0] = 0; |
e662e1cf | 694 | |
e0df154f | 695 | if (preempt_count() != count) { |
bf5d770b | 696 | sprintf(msgbuf, "preemption imbalance "); |
e0df154f | 697 | preempt_count() = count; |
1da177e4 | 698 | } |
e0df154f | 699 | if (irqs_disabled()) { |
a76bfd0d | 700 | strlcat(msgbuf, "disabled interrupts ", sizeof(msgbuf)); |
e0df154f LT |
701 | local_irq_enable(); |
702 | } | |
f91eb62f | 703 | WARN(msgbuf[0], "initcall %pF returned with %s\n", fn, msgbuf); |
59f9415f | 704 | |
30dbb20e | 705 | return ret; |
e0df154f LT |
706 | } |
707 | ||
708 | ||
026cee00 PM |
709 | extern initcall_t __initcall_start[]; |
710 | extern initcall_t __initcall0_start[]; | |
711 | extern initcall_t __initcall1_start[]; | |
712 | extern initcall_t __initcall2_start[]; | |
713 | extern initcall_t __initcall3_start[]; | |
714 | extern initcall_t __initcall4_start[]; | |
715 | extern initcall_t __initcall5_start[]; | |
716 | extern initcall_t __initcall6_start[]; | |
717 | extern initcall_t __initcall7_start[]; | |
718 | extern initcall_t __initcall_end[]; | |
719 | ||
720 | static initcall_t *initcall_levels[] __initdata = { | |
721 | __initcall0_start, | |
722 | __initcall1_start, | |
723 | __initcall2_start, | |
724 | __initcall3_start, | |
725 | __initcall4_start, | |
726 | __initcall5_start, | |
727 | __initcall6_start, | |
728 | __initcall7_start, | |
729 | __initcall_end, | |
730 | }; | |
731 | ||
96263d28 | 732 | /* Keep these in sync with initcalls in include/linux/init.h */ |
026cee00 | 733 | static char *initcall_level_names[] __initdata = { |
9fb48c74 JC |
734 | "early", |
735 | "core", | |
736 | "postcore", | |
737 | "arch", | |
738 | "subsys", | |
739 | "fs", | |
740 | "device", | |
741 | "late", | |
026cee00 PM |
742 | }; |
743 | ||
026cee00 | 744 | static void __init do_initcall_level(int level) |
e0df154f | 745 | { |
026cee00 | 746 | extern const struct kernel_param __start___param[], __stop___param[]; |
196a15b4 | 747 | initcall_t *fn; |
e0df154f | 748 | |
026cee00 PM |
749 | strcpy(static_command_line, saved_command_line); |
750 | parse_args(initcall_level_names[level], | |
751 | static_command_line, __start___param, | |
752 | __stop___param - __start___param, | |
753 | level, level, | |
eb157427 | 754 | &repair_env_string); |
026cee00 PM |
755 | |
756 | for (fn = initcall_levels[level]; fn < initcall_levels[level+1]; fn++) | |
196a15b4 | 757 | do_one_initcall(*fn); |
1da177e4 LT |
758 | } |
759 | ||
026cee00 PM |
760 | static void __init do_initcalls(void) |
761 | { | |
762 | int level; | |
763 | ||
19efb72f | 764 | for (level = 0; level < ARRAY_SIZE(initcall_levels) - 1; level++) |
026cee00 PM |
765 | do_initcall_level(level); |
766 | } | |
767 | ||
1da177e4 LT |
768 | /* |
769 | * Ok, the machine is now initialized. None of the devices | |
770 | * have been touched yet, but the CPU subsystem is up and | |
771 | * running, and memory and process management works. | |
772 | * | |
773 | * Now we can finally start doing some real work.. | |
774 | */ | |
775 | static void __init do_basic_setup(void) | |
776 | { | |
759ee091 | 777 | cpuset_init_smp(); |
1da177e4 | 778 | usermodehelper_init(); |
41ffe5d5 | 779 | shmem_init(); |
1da177e4 | 780 | driver_init(); |
b04c3afb | 781 | init_irq_proc(); |
b99b87f7 | 782 | do_ctors(); |
d5767c53 | 783 | usermodehelper_enable(); |
b0f84374 | 784 | do_initcalls(); |
b7a52f51 | 785 | random_int_secret_init(); |
1da177e4 LT |
786 | } |
787 | ||
7babe8db | 788 | static void __init do_pre_smp_initcalls(void) |
c2147a50 | 789 | { |
196a15b4 | 790 | initcall_t *fn; |
c2147a50 | 791 | |
026cee00 | 792 | for (fn = __initcall_start; fn < __initcall0_start; fn++) |
196a15b4 | 793 | do_one_initcall(*fn); |
c2147a50 EGM |
794 | } |
795 | ||
bb813f4c TH |
796 | /* |
797 | * This function requests modules which should be loaded by default and is | |
798 | * called twice right after initrd is mounted and right before init is | |
799 | * exec'd. If such modules are on either initrd or rootfs, they will be | |
800 | * loaded before control is passed to userland. | |
801 | */ | |
802 | void __init load_default_modules(void) | |
803 | { | |
804 | load_default_elevator_module(); | |
805 | } | |
806 | ||
a74fb73c | 807 | static int run_init_process(const char *init_filename) |
1da177e4 LT |
808 | { |
809 | argv_init[0] = init_filename; | |
ae903caa AV |
810 | return do_execve(init_filename, |
811 | (const char __user *const __user *)argv_init, | |
812 | (const char __user *const __user *)envp_init); | |
1da177e4 LT |
813 | } |
814 | ||
f80b0c90 | 815 | static noinline void __init kernel_init_freeable(void); |
d6b21238 AV |
816 | |
817 | static int __ref kernel_init(void *unused) | |
ee5bfa64 | 818 | { |
d6b21238 | 819 | kernel_init_freeable(); |
22a9d645 AV |
820 | /* need to finish all async __init code before freeing the memory */ |
821 | async_synchronize_full(); | |
ee5bfa64 | 822 | free_initmem(); |
ee5bfa64 VG |
823 | mark_rodata_ro(); |
824 | system_state = SYSTEM_RUNNING; | |
825 | numa_default_policy(); | |
826 | ||
4a9d4b02 | 827 | flush_delayed_fput(); |
fae5fa44 | 828 | |
ee5bfa64 | 829 | if (ramdisk_execute_command) { |
a74fb73c AV |
830 | if (!run_init_process(ramdisk_execute_command)) |
831 | return 0; | |
ea676e84 | 832 | pr_err("Failed to execute %s\n", ramdisk_execute_command); |
ee5bfa64 VG |
833 | } |
834 | ||
835 | /* | |
836 | * We try each of these until one succeeds. | |
837 | * | |
838 | * The Bourne shell can be used instead of init if we are | |
839 | * trying to recover a really broken machine. | |
840 | */ | |
841 | if (execute_command) { | |
a74fb73c AV |
842 | if (!run_init_process(execute_command)) |
843 | return 0; | |
ea676e84 AM |
844 | pr_err("Failed to execute %s. Attempting defaults...\n", |
845 | execute_command); | |
ee5bfa64 | 846 | } |
a74fb73c AV |
847 | if (!run_init_process("/sbin/init") || |
848 | !run_init_process("/etc/init") || | |
849 | !run_init_process("/bin/init") || | |
850 | !run_init_process("/bin/sh")) | |
851 | return 0; | |
ee5bfa64 | 852 | |
9a85b8d6 AM |
853 | panic("No init found. Try passing init= option to kernel. " |
854 | "See Linux Documentation/init.txt for guidance."); | |
ee5bfa64 VG |
855 | } |
856 | ||
f80b0c90 | 857 | static noinline void __init kernel_init_freeable(void) |
1da177e4 | 858 | { |
b433c3d4 PZ |
859 | /* |
860 | * Wait until kthreadd is all set-up. | |
861 | */ | |
862 | wait_for_completion(&kthreadd_done); | |
31a67102 LT |
863 | |
864 | /* Now the scheduler is fully set up and can do blocking allocations */ | |
865 | gfp_allowed_mask = __GFP_BITS_MASK; | |
866 | ||
58568d2a MX |
867 | /* |
868 | * init can allocate pages on any node | |
869 | */ | |
3c466d46 | 870 | set_mems_allowed(node_states[N_MEMORY]); |
1da177e4 LT |
871 | /* |
872 | * init can run on any cpu. | |
873 | */ | |
1a2142af | 874 | set_cpus_allowed_ptr(current, cpu_all_mask); |
1da177e4 | 875 | |
9ec52099 CLG |
876 | cad_pid = task_pid(current); |
877 | ||
ca74a6f8 | 878 | smp_prepare_cpus(setup_max_cpus); |
1da177e4 LT |
879 | |
880 | do_pre_smp_initcalls(); | |
004417a6 | 881 | lockup_detector_init(); |
1da177e4 | 882 | |
1da177e4 LT |
883 | smp_init(); |
884 | sched_init_smp(); | |
885 | ||
1da177e4 LT |
886 | do_basic_setup(); |
887 | ||
2bd3a997 EB |
888 | /* Open the /dev/console on the rootfs, this should never fail */ |
889 | if (sys_open((const char __user *) "/dev/console", O_RDWR, 0) < 0) | |
ea676e84 | 890 | pr_err("Warning: unable to open an initial console.\n"); |
2bd3a997 EB |
891 | |
892 | (void) sys_dup(0); | |
893 | (void) sys_dup(0); | |
1da177e4 LT |
894 | /* |
895 | * check if there is an early userspace init. If yes, let it do all | |
896 | * the work | |
897 | */ | |
ffdfc409 OJ |
898 | |
899 | if (!ramdisk_execute_command) | |
900 | ramdisk_execute_command = "/init"; | |
901 | ||
902 | if (sys_access((const char __user *) ramdisk_execute_command, 0) != 0) { | |
903 | ramdisk_execute_command = NULL; | |
1da177e4 | 904 | prepare_namespace(); |
ffdfc409 | 905 | } |
1da177e4 LT |
906 | |
907 | /* | |
908 | * Ok, we have completed the initial bootup, and | |
909 | * we're essentially up and running. Get rid of the | |
910 | * initmem segments and start the user-mode stuff.. | |
911 | */ | |
bb813f4c TH |
912 | |
913 | /* rootfs is available now, try loading default modules */ | |
914 | load_default_modules(); | |
1da177e4 | 915 | } |