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> |
4a9d4b02 | 71 | #include <linux/file.h> |
a74fb73c | 72 | #include <linux/ptrace.h> |
1da177e4 LT |
73 | |
74 | #include <asm/io.h> | |
75 | #include <asm/bugs.h> | |
76 | #include <asm/setup.h> | |
a940199f | 77 | #include <asm/sections.h> |
37b73c82 | 78 | #include <asm/cacheflush.h> |
1da177e4 | 79 | |
1da177e4 LT |
80 | #ifdef CONFIG_X86_LOCAL_APIC |
81 | #include <asm/smp.h> | |
82 | #endif | |
83 | ||
aae5f662 | 84 | static int kernel_init(void *); |
1da177e4 LT |
85 | |
86 | extern void init_IRQ(void); | |
1da177e4 LT |
87 | extern void fork_init(unsigned long); |
88 | extern void mca_init(void); | |
89 | extern void sbus_init(void); | |
1da177e4 | 90 | extern void radix_tree_init(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 JB |
132 | /* |
133 | * If set, this is an indication to the drivers that reset the underlying | |
134 | * device before going ahead with the initialization otherwise driver might | |
135 | * rely on the BIOS and skip the reset operation. | |
136 | * | |
137 | * This is useful if kernel is booting in an unreliable environment. | |
138 | * For ex. kdump situaiton where previous kernel has crashed, BIOS has been | |
139 | * skipped and devices will be in unknown state. | |
140 | */ | |
141 | unsigned int reset_devices; | |
142 | EXPORT_SYMBOL(reset_devices); | |
1da177e4 | 143 | |
7e96287d VG |
144 | static int __init set_reset_devices(char *str) |
145 | { | |
146 | reset_devices = 1; | |
147 | return 1; | |
148 | } | |
149 | ||
150 | __setup("reset_devices", set_reset_devices); | |
151 | ||
d7627467 DH |
152 | static const char * argv_init[MAX_INIT_ARGS+2] = { "init", NULL, }; |
153 | const char * envp_init[MAX_INIT_ENVS+2] = { "HOME=/", "TERM=linux", NULL, }; | |
1da177e4 LT |
154 | static const char *panic_later, *panic_param; |
155 | ||
914dcaa8 | 156 | extern const struct obs_kernel_param __setup_start[], __setup_end[]; |
1da177e4 LT |
157 | |
158 | static int __init obsolete_checksetup(char *line) | |
159 | { | |
914dcaa8 | 160 | const struct obs_kernel_param *p; |
33df0d19 | 161 | int had_early_param = 0; |
1da177e4 LT |
162 | |
163 | p = __setup_start; | |
164 | do { | |
165 | int n = strlen(p->str); | |
b1e4d20c | 166 | if (parameqn(line, p->str, n)) { |
1da177e4 | 167 | if (p->early) { |
33df0d19 RR |
168 | /* Already done in parse_early_param? |
169 | * (Needs exact match on param part). | |
170 | * Keep iterating, as we can have early | |
171 | * params and __setups of same names 8( */ | |
1da177e4 | 172 | if (line[n] == '\0' || line[n] == '=') |
33df0d19 | 173 | had_early_param = 1; |
1da177e4 LT |
174 | } else if (!p->setup_func) { |
175 | printk(KERN_WARNING "Parameter %s is obsolete," | |
176 | " ignored\n", p->str); | |
177 | return 1; | |
178 | } else if (p->setup_func(line + n)) | |
179 | return 1; | |
180 | } | |
181 | p++; | |
182 | } while (p < __setup_end); | |
33df0d19 RR |
183 | |
184 | return had_early_param; | |
1da177e4 LT |
185 | } |
186 | ||
187 | /* | |
188 | * This should be approx 2 Bo*oMips to start (note initial shift), and will | |
189 | * still work even if initially too large, it will just take slightly longer | |
190 | */ | |
191 | unsigned long loops_per_jiffy = (1<<12); | |
192 | ||
193 | EXPORT_SYMBOL(loops_per_jiffy); | |
194 | ||
195 | static int __init debug_kernel(char *str) | |
196 | { | |
1da177e4 | 197 | console_loglevel = 10; |
f6f21c81 | 198 | return 0; |
1da177e4 LT |
199 | } |
200 | ||
201 | static int __init quiet_kernel(char *str) | |
202 | { | |
1da177e4 | 203 | console_loglevel = 4; |
f6f21c81 | 204 | return 0; |
1da177e4 LT |
205 | } |
206 | ||
f6f21c81 YL |
207 | early_param("debug", debug_kernel); |
208 | early_param("quiet", quiet_kernel); | |
1da177e4 LT |
209 | |
210 | static int __init loglevel(char *str) | |
211 | { | |
808bf29b AS |
212 | int newlevel; |
213 | ||
214 | /* | |
215 | * Only update loglevel value when a correct setting was passed, | |
216 | * to prevent blind crashes (when loglevel being set to 0) that | |
217 | * are quite hard to debug | |
218 | */ | |
219 | if (get_option(&str, &newlevel)) { | |
220 | console_loglevel = newlevel; | |
221 | return 0; | |
222 | } | |
223 | ||
224 | return -EINVAL; | |
1da177e4 LT |
225 | } |
226 | ||
f6f21c81 | 227 | early_param("loglevel", loglevel); |
1da177e4 | 228 | |
a99cd112 | 229 | /* Change NUL term back to "=", to make "param" the whole string. */ |
eb157427 | 230 | static int __init repair_env_string(char *param, char *val, const char *unused) |
1da177e4 | 231 | { |
1da177e4 LT |
232 | if (val) { |
233 | /* param=val or param="val"? */ | |
234 | if (val == param+strlen(param)+1) | |
235 | val[-1] = '='; | |
236 | else if (val == param+strlen(param)+2) { | |
237 | val[-2] = '='; | |
238 | memmove(val-1, val, strlen(val)+1); | |
239 | val--; | |
240 | } else | |
241 | BUG(); | |
242 | } | |
a99cd112 CM |
243 | return 0; |
244 | } | |
245 | ||
246 | /* | |
247 | * Unknown boot options get handed to init, unless they look like | |
248 | * unused parameters (modprobe will find them in /proc/cmdline). | |
249 | */ | |
eb157427 | 250 | static int __init unknown_bootoption(char *param, char *val, const char *unused) |
a99cd112 | 251 | { |
eb157427 | 252 | repair_env_string(param, val, unused); |
1da177e4 LT |
253 | |
254 | /* Handle obsolete-style parameters */ | |
255 | if (obsolete_checksetup(param)) | |
256 | return 0; | |
257 | ||
f066a4f6 RR |
258 | /* Unused module parameter. */ |
259 | if (strchr(param, '.') && (!val || strchr(param, '.') < val)) | |
1da177e4 | 260 | return 0; |
1da177e4 LT |
261 | |
262 | if (panic_later) | |
263 | return 0; | |
264 | ||
265 | if (val) { | |
266 | /* Environment option */ | |
267 | unsigned int i; | |
268 | for (i = 0; envp_init[i]; i++) { | |
269 | if (i == MAX_INIT_ENVS) { | |
270 | panic_later = "Too many boot env vars at `%s'"; | |
271 | panic_param = param; | |
272 | } | |
273 | if (!strncmp(param, envp_init[i], val - param)) | |
274 | break; | |
275 | } | |
276 | envp_init[i] = param; | |
277 | } else { | |
278 | /* Command line option */ | |
279 | unsigned int i; | |
280 | for (i = 0; argv_init[i]; i++) { | |
281 | if (i == MAX_INIT_ARGS) { | |
282 | panic_later = "Too many boot init vars at `%s'"; | |
283 | panic_param = param; | |
284 | } | |
285 | } | |
286 | argv_init[i] = param; | |
287 | } | |
288 | return 0; | |
289 | } | |
290 | ||
291 | static int __init init_setup(char *str) | |
292 | { | |
293 | unsigned int i; | |
294 | ||
295 | execute_command = str; | |
296 | /* | |
297 | * In case LILO is going to boot us with default command line, | |
298 | * it prepends "auto" before the whole cmdline which makes | |
299 | * the shell think it should execute a script with such name. | |
300 | * So we ignore all arguments entered _before_ init=... [MJ] | |
301 | */ | |
302 | for (i = 1; i < MAX_INIT_ARGS; i++) | |
303 | argv_init[i] = NULL; | |
304 | return 1; | |
305 | } | |
306 | __setup("init=", init_setup); | |
307 | ||
ffdfc409 OJ |
308 | static int __init rdinit_setup(char *str) |
309 | { | |
310 | unsigned int i; | |
311 | ||
312 | ramdisk_execute_command = str; | |
313 | /* See "auto" comment in init_setup */ | |
314 | for (i = 1; i < MAX_INIT_ARGS; i++) | |
315 | argv_init[i] = NULL; | |
316 | return 1; | |
317 | } | |
318 | __setup("rdinit=", rdinit_setup); | |
319 | ||
1da177e4 | 320 | #ifndef CONFIG_SMP |
34db18a0 | 321 | static const unsigned int setup_max_cpus = NR_CPUS; |
1da177e4 LT |
322 | #ifdef CONFIG_X86_LOCAL_APIC |
323 | static void __init smp_init(void) | |
324 | { | |
325 | APIC_init_uniprocessor(); | |
326 | } | |
327 | #else | |
328 | #define smp_init() do { } while (0) | |
329 | #endif | |
330 | ||
e0982e90 | 331 | static inline void setup_nr_cpu_ids(void) { } |
1da177e4 | 332 | static inline void smp_prepare_cpus(unsigned int maxcpus) { } |
1da177e4 LT |
333 | #endif |
334 | ||
30d7e0d4 ABL |
335 | /* |
336 | * We need to store the untouched command line for future reference. | |
337 | * We also need to store the touched command line since the parameter | |
338 | * parsing is performed in place, and we should allow a component to | |
339 | * store reference of name/value for future reference. | |
340 | */ | |
341 | static void __init setup_command_line(char *command_line) | |
342 | { | |
343 | saved_command_line = alloc_bootmem(strlen (boot_command_line)+1); | |
344 | static_command_line = alloc_bootmem(strlen (command_line)+1); | |
345 | strcpy (saved_command_line, boot_command_line); | |
346 | strcpy (static_command_line, command_line); | |
347 | } | |
348 | ||
1da177e4 LT |
349 | /* |
350 | * We need to finalize in a non-__init function or else race conditions | |
351 | * between the root thread and the init thread may cause start_kernel to | |
352 | * be reaped by free_initmem before the root thread has proceeded to | |
353 | * cpu_idle. | |
354 | * | |
355 | * gcc-3.4 accidentally inlines this function, so use noinline. | |
356 | */ | |
357 | ||
b433c3d4 PZ |
358 | static __initdata DECLARE_COMPLETION(kthreadd_done); |
359 | ||
f99ebf0a | 360 | static noinline void __init_refok rest_init(void) |
1da177e4 | 361 | { |
73c27992 EB |
362 | int pid; |
363 | ||
7db905e6 | 364 | rcu_scheduler_starting(); |
b433c3d4 | 365 | /* |
97158569 | 366 | * We need to spawn init first so that it obtains pid 1, however |
b433c3d4 PZ |
367 | * the init task will end up wanting to create kthreads, which, if |
368 | * we schedule it before we create kthreadd, will OOPS. | |
369 | */ | |
aae5f662 | 370 | kernel_thread(kernel_init, NULL, CLONE_FS | CLONE_SIGHAND); |
1da177e4 | 371 | numa_default_policy(); |
73c27992 | 372 | pid = kernel_thread(kthreadd, NULL, CLONE_FS | CLONE_FILES); |
d11c563d | 373 | rcu_read_lock(); |
5cd20455 | 374 | kthreadd_task = find_task_by_pid_ns(pid, &init_pid_ns); |
d11c563d | 375 | rcu_read_unlock(); |
b433c3d4 | 376 | complete(&kthreadd_done); |
f340c0d1 IM |
377 | |
378 | /* | |
379 | * The boot idle thread must execute schedule() | |
1df21055 | 380 | * at least once to get things moving: |
f340c0d1 | 381 | */ |
1df21055 | 382 | init_idle_bootup_task(current); |
bd2f5536 | 383 | schedule_preempt_disabled(); |
5bfb5d69 | 384 | /* Call into cpu_idle with preempt disabled */ |
1da177e4 | 385 | cpu_idle(); |
1df21055 | 386 | } |
1da177e4 LT |
387 | |
388 | /* Check for early params. */ | |
9fb48c74 | 389 | static int __init do_early_param(char *param, char *val, const char *unused) |
1da177e4 | 390 | { |
914dcaa8 | 391 | const struct obs_kernel_param *p; |
1da177e4 LT |
392 | |
393 | for (p = __setup_start; p < __setup_end; p++) { | |
b1e4d20c | 394 | if ((p->early && parameq(param, p->str)) || |
18a8bd94 YL |
395 | (strcmp(param, "console") == 0 && |
396 | strcmp(p->str, "earlycon") == 0) | |
397 | ) { | |
1da177e4 LT |
398 | if (p->setup_func(val) != 0) |
399 | printk(KERN_WARNING | |
400 | "Malformed early option '%s'\n", param); | |
401 | } | |
402 | } | |
403 | /* We accept everything at this stage. */ | |
404 | return 0; | |
405 | } | |
406 | ||
13977091 MD |
407 | void __init parse_early_options(char *cmdline) |
408 | { | |
026cee00 | 409 | parse_args("early options", cmdline, NULL, 0, 0, 0, do_early_param); |
13977091 MD |
410 | } |
411 | ||
1da177e4 LT |
412 | /* Arch code calls this early on, or if not, just before other parsing. */ |
413 | void __init parse_early_param(void) | |
414 | { | |
415 | static __initdata int done = 0; | |
416 | static __initdata char tmp_cmdline[COMMAND_LINE_SIZE]; | |
417 | ||
418 | if (done) | |
419 | return; | |
420 | ||
421 | /* All fall through to do_early_param. */ | |
30d7e0d4 | 422 | strlcpy(tmp_cmdline, boot_command_line, COMMAND_LINE_SIZE); |
13977091 | 423 | parse_early_options(tmp_cmdline); |
1da177e4 LT |
424 | done = 1; |
425 | } | |
426 | ||
427 | /* | |
428 | * Activate the first processor. | |
429 | */ | |
430 | ||
44fd2299 SS |
431 | static void __init boot_cpu_init(void) |
432 | { | |
433 | int cpu = smp_processor_id(); | |
434 | /* Mark the boot cpu "present", "online" etc for SMP and UP case */ | |
915441b6 | 435 | set_cpu_online(cpu, true); |
933b0618 | 436 | set_cpu_active(cpu, true); |
915441b6 RR |
437 | set_cpu_present(cpu, true); |
438 | set_cpu_possible(cpu, true); | |
44fd2299 SS |
439 | } |
440 | ||
839ad62e | 441 | void __init __weak smp_setup_processor_id(void) |
033ab7f8 AM |
442 | { |
443 | } | |
444 | ||
eded09cc | 445 | # if THREAD_SIZE >= PAGE_SIZE |
8c9843e5 BH |
446 | void __init __weak thread_info_cache_init(void) |
447 | { | |
448 | } | |
eded09cc | 449 | #endif |
8c9843e5 | 450 | |
444f478f PE |
451 | /* |
452 | * Set up kernel memory allocators | |
453 | */ | |
454 | static void __init mm_init(void) | |
455 | { | |
ca371c0d | 456 | /* |
7fa87ce7 JC |
457 | * page_cgroup requires contiguous pages, |
458 | * bigger than MAX_ORDER unless SPARSEMEM. | |
ca371c0d KH |
459 | */ |
460 | page_cgroup_init_flatmem(); | |
444f478f PE |
461 | mem_init(); |
462 | kmem_cache_init(); | |
099a19d9 | 463 | percpu_init_late(); |
c868d550 | 464 | pgtable_cache_init(); |
444f478f PE |
465 | vmalloc_init(); |
466 | } | |
467 | ||
1da177e4 LT |
468 | asmlinkage void __init start_kernel(void) |
469 | { | |
470 | char * command_line; | |
914dcaa8 | 471 | extern const struct kernel_param __start___param[], __stop___param[]; |
033ab7f8 | 472 | |
fbb9ce95 IM |
473 | /* |
474 | * Need to run as early as possible, to initialize the | |
475 | * lockdep hash: | |
476 | */ | |
477 | lockdep_init(); | |
73839c5b | 478 | smp_setup_processor_id(); |
3ac7fe5a | 479 | debug_objects_early_init(); |
42059429 IM |
480 | |
481 | /* | |
482 | * Set up the the initial canary ASAP: | |
483 | */ | |
484 | boot_init_stack_canary(); | |
485 | ||
ddbcc7e8 | 486 | cgroup_init_early(); |
fbb9ce95 IM |
487 | |
488 | local_irq_disable(); | |
2ce802f6 | 489 | early_boot_irqs_disabled = true; |
fbb9ce95 | 490 | |
1da177e4 LT |
491 | /* |
492 | * Interrupts are still disabled. Do necessary setups, then | |
493 | * enable them | |
494 | */ | |
906568c9 | 495 | tick_init(); |
44fd2299 | 496 | boot_cpu_init(); |
1da177e4 | 497 | page_address_init(); |
657cafa6 | 498 | printk(KERN_NOTICE "%s", linux_banner); |
1da177e4 | 499 | setup_arch(&command_line); |
cf475ad2 | 500 | mm_init_owner(&init_mm, &init_task); |
6345d24d | 501 | mm_init_cpumask(&init_mm); |
30d7e0d4 | 502 | setup_command_line(command_line); |
e0982e90 | 503 | setup_nr_cpu_ids(); |
d6647bdf | 504 | setup_per_cpu_areas(); |
44fd2299 | 505 | smp_prepare_boot_cpu(); /* arch-specific boot-cpu hooks */ |
1da177e4 | 506 | |
9adb62a5 | 507 | build_all_zonelists(NULL, NULL); |
83b519e8 PE |
508 | page_alloc_init(); |
509 | ||
510 | printk(KERN_NOTICE "Kernel command line: %s\n", boot_command_line); | |
511 | parse_early_param(); | |
512 | parse_args("Booting kernel", static_command_line, __start___param, | |
513 | __stop___param - __start___param, | |
ae82fdb1 | 514 | -1, -1, &unknown_bootoption); |
97ce2c88 JF |
515 | |
516 | jump_label_init(); | |
517 | ||
83b519e8 PE |
518 | /* |
519 | * These use large bootmem allocations and must precede | |
520 | * kmem_cache_init() | |
521 | */ | |
162a7e75 | 522 | setup_log_buf(0); |
83b519e8 | 523 | pidhash_init(); |
83b519e8 PE |
524 | vfs_caches_init_early(); |
525 | sort_main_extable(); | |
526 | trap_init(); | |
444f478f | 527 | mm_init(); |
de03c72c | 528 | |
1da177e4 LT |
529 | /* |
530 | * Set up the scheduler prior starting any interrupts (such as the | |
531 | * timer interrupt). Full topology setup happens at smp_init() | |
532 | * time - but meanwhile we still have a functioning scheduler. | |
533 | */ | |
534 | sched_init(); | |
535 | /* | |
536 | * Disable preemption - early bootup scheduling is extremely | |
537 | * fragile until we cpu_idle() for the first time. | |
538 | */ | |
539 | preempt_disable(); | |
c4a68306 AB |
540 | if (!irqs_disabled()) { |
541 | printk(KERN_WARNING "start_kernel(): bug: interrupts were " | |
542 | "enabled *very* early, fixing it\n"); | |
543 | local_irq_disable(); | |
544 | } | |
9f58a205 | 545 | idr_init_cache(); |
24a24bb6 | 546 | perf_event_init(); |
1da177e4 | 547 | rcu_init(); |
773e3eb7 | 548 | radix_tree_init(); |
0b8f1efa YL |
549 | /* init some links before init_ISA_irqs() */ |
550 | early_irq_init(); | |
1da177e4 | 551 | init_IRQ(); |
1da177e4 | 552 | init_timers(); |
c0a31329 | 553 | hrtimers_init(); |
1da177e4 | 554 | softirq_init(); |
ad596171 | 555 | timekeeping_init(); |
88fecaa2 | 556 | time_init(); |
93e02814 | 557 | profile_init(); |
d8ad7d11 | 558 | call_function_init(); |
93e02814 | 559 | if (!irqs_disabled()) |
24d431d0 RL |
560 | printk(KERN_CRIT "start_kernel(): bug: interrupts were " |
561 | "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) { |
1da177e4 | 588 | printk(KERN_CRIT "initrd overwritten (0x%08lx < 0x%08lx) - " |
fb6624eb | 589 | "disabling it.\n", |
bd673c7c GU |
590 | page_to_pfn(virt_to_page((void *)initrd_start)), |
591 | min_low_pfn); | |
1da177e4 LT |
592 | initrd_start = 0; |
593 | } | |
594 | #endif | |
94b6da5a | 595 | page_cgroup_init(); |
3ac7fe5a | 596 | debug_objects_mem_init(); |
9b090f2d | 597 | kmemleak_init(); |
e7c8d5c9 | 598 | setup_per_cpu_pageset(); |
1da177e4 LT |
599 | numa_policy_init(); |
600 | if (late_time_init) | |
601 | late_time_init(); | |
fa84e9ee | 602 | sched_clock_init(); |
1da177e4 LT |
603 | calibrate_delay(); |
604 | pidmap_init(); | |
1da177e4 | 605 | anon_vma_init(); |
11520e5e LT |
606 | #ifdef CONFIG_X86 |
607 | if (efi_enabled) | |
608 | efi_enter_virtual_mode(); | |
609 | #endif | |
8c9843e5 | 610 | thread_info_cache_init(); |
d84f4f99 | 611 | cred_init(); |
4481374c | 612 | fork_init(totalram_pages); |
1da177e4 LT |
613 | proc_caches_init(); |
614 | buffer_init(); | |
1da177e4 LT |
615 | key_init(); |
616 | security_init(); | |
0b4b3827 | 617 | dbg_late_init(); |
4481374c | 618 | vfs_caches_init(totalram_pages); |
1da177e4 LT |
619 | signals_init(); |
620 | /* rootfs populating might need page-writeback */ | |
621 | page_writeback_init(); | |
622 | #ifdef CONFIG_PROC_FS | |
623 | proc_root_init(); | |
624 | #endif | |
ddbcc7e8 | 625 | cgroup_init(); |
1da177e4 | 626 | cpuset_init(); |
c757249a | 627 | taskstats_init_early(); |
ca74e92b | 628 | delayacct_init(); |
1da177e4 LT |
629 | |
630 | check_bugs(); | |
631 | ||
632 | acpi_early_init(); /* before LAPIC and SMP init */ | |
6ae6996a | 633 | sfi_init_late(); |
1da177e4 | 634 | |
2223af38 JT |
635 | if (efi_enabled) { |
636 | efi_late_init(); | |
78510792 | 637 | efi_free_boot_services(); |
2223af38 | 638 | } |
78510792 | 639 | |
68bf21aa SR |
640 | ftrace_init(); |
641 | ||
1da177e4 LT |
642 | /* Do the rest non-__init'ed, we're now alive */ |
643 | rest_init(); | |
644 | } | |
645 | ||
b99b87f7 PO |
646 | /* Call all constructor functions linked into the kernel. */ |
647 | static void __init do_ctors(void) | |
648 | { | |
649 | #ifdef CONFIG_CONSTRUCTORS | |
196a15b4 | 650 | ctor_fn_t *fn = (ctor_fn_t *) __ctors_start; |
b99b87f7 | 651 | |
196a15b4 HS |
652 | for (; fn < (ctor_fn_t *) __ctors_end; fn++) |
653 | (*fn)(); | |
b99b87f7 PO |
654 | #endif |
655 | } | |
656 | ||
2329abfa | 657 | bool initcall_debug; |
d0ea3d7d | 658 | core_param(initcall_debug, initcall_debug, bool, 0644); |
1da177e4 | 659 | |
4a683bf9 | 660 | static char msgbuf[64]; |
4a683bf9 | 661 | |
e4461271 | 662 | static int __init_or_module do_one_initcall_debug(initcall_t fn) |
1da177e4 | 663 | { |
74239072 | 664 | ktime_t calltime, delta, rettime; |
30dbb20e AW |
665 | unsigned long long duration; |
666 | int ret; | |
1da177e4 | 667 | |
22c5c03b KW |
668 | printk(KERN_DEBUG "calling %pF @ %i\n", fn, task_pid_nr(current)); |
669 | calltime = ktime_get(); | |
30dbb20e | 670 | ret = fn(); |
22c5c03b KW |
671 | rettime = ktime_get(); |
672 | delta = ktime_sub(rettime, calltime); | |
673 | duration = (unsigned long long) ktime_to_ns(delta) >> 10; | |
674 | printk(KERN_DEBUG "initcall %pF returned %d after %lld usecs\n", fn, | |
675 | ret, duration); | |
1da177e4 | 676 | |
22c5c03b KW |
677 | return ret; |
678 | } | |
679 | ||
e4461271 | 680 | int __init_or_module do_one_initcall(initcall_t fn) |
22c5c03b KW |
681 | { |
682 | int count = preempt_count(); | |
683 | int ret; | |
684 | ||
685 | if (initcall_debug) | |
686 | ret = do_one_initcall_debug(fn); | |
687 | else | |
688 | ret = fn(); | |
8f0c45cd | 689 | |
e0df154f | 690 | msgbuf[0] = 0; |
e662e1cf | 691 | |
30dbb20e AW |
692 | if (ret && ret != -ENODEV && initcall_debug) |
693 | sprintf(msgbuf, "error code %d ", ret); | |
e662e1cf | 694 | |
e0df154f | 695 | if (preempt_count() != count) { |
a76bfd0d | 696 | strlcat(msgbuf, "preemption imbalance ", sizeof(msgbuf)); |
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 | } | |
703 | if (msgbuf[0]) { | |
96d746c6 | 704 | printk("initcall %pF returned with %s\n", fn, msgbuf); |
e0df154f | 705 | } |
59f9415f | 706 | |
30dbb20e | 707 | return ret; |
e0df154f LT |
708 | } |
709 | ||
710 | ||
026cee00 PM |
711 | extern initcall_t __initcall_start[]; |
712 | extern initcall_t __initcall0_start[]; | |
713 | extern initcall_t __initcall1_start[]; | |
714 | extern initcall_t __initcall2_start[]; | |
715 | extern initcall_t __initcall3_start[]; | |
716 | extern initcall_t __initcall4_start[]; | |
717 | extern initcall_t __initcall5_start[]; | |
718 | extern initcall_t __initcall6_start[]; | |
719 | extern initcall_t __initcall7_start[]; | |
720 | extern initcall_t __initcall_end[]; | |
721 | ||
722 | static initcall_t *initcall_levels[] __initdata = { | |
723 | __initcall0_start, | |
724 | __initcall1_start, | |
725 | __initcall2_start, | |
726 | __initcall3_start, | |
727 | __initcall4_start, | |
728 | __initcall5_start, | |
729 | __initcall6_start, | |
730 | __initcall7_start, | |
731 | __initcall_end, | |
732 | }; | |
733 | ||
96263d28 | 734 | /* Keep these in sync with initcalls in include/linux/init.h */ |
026cee00 | 735 | static char *initcall_level_names[] __initdata = { |
9fb48c74 JC |
736 | "early", |
737 | "core", | |
738 | "postcore", | |
739 | "arch", | |
740 | "subsys", | |
741 | "fs", | |
742 | "device", | |
743 | "late", | |
026cee00 PM |
744 | }; |
745 | ||
026cee00 | 746 | static void __init do_initcall_level(int level) |
e0df154f | 747 | { |
026cee00 | 748 | extern const struct kernel_param __start___param[], __stop___param[]; |
196a15b4 | 749 | initcall_t *fn; |
e0df154f | 750 | |
026cee00 PM |
751 | strcpy(static_command_line, saved_command_line); |
752 | parse_args(initcall_level_names[level], | |
753 | static_command_line, __start___param, | |
754 | __stop___param - __start___param, | |
755 | level, level, | |
eb157427 | 756 | &repair_env_string); |
026cee00 PM |
757 | |
758 | for (fn = initcall_levels[level]; fn < initcall_levels[level+1]; fn++) | |
196a15b4 | 759 | do_one_initcall(*fn); |
1da177e4 LT |
760 | } |
761 | ||
026cee00 PM |
762 | static void __init do_initcalls(void) |
763 | { | |
764 | int level; | |
765 | ||
19efb72f | 766 | for (level = 0; level < ARRAY_SIZE(initcall_levels) - 1; level++) |
026cee00 PM |
767 | do_initcall_level(level); |
768 | } | |
769 | ||
1da177e4 LT |
770 | /* |
771 | * Ok, the machine is now initialized. None of the devices | |
772 | * have been touched yet, but the CPU subsystem is up and | |
773 | * running, and memory and process management works. | |
774 | * | |
775 | * Now we can finally start doing some real work.. | |
776 | */ | |
777 | static void __init do_basic_setup(void) | |
778 | { | |
759ee091 | 779 | cpuset_init_smp(); |
1da177e4 | 780 | usermodehelper_init(); |
41ffe5d5 | 781 | shmem_init(); |
1da177e4 | 782 | driver_init(); |
b04c3afb | 783 | init_irq_proc(); |
b99b87f7 | 784 | do_ctors(); |
d5767c53 | 785 | usermodehelper_enable(); |
b0f84374 | 786 | do_initcalls(); |
1da177e4 LT |
787 | } |
788 | ||
7babe8db | 789 | static void __init do_pre_smp_initcalls(void) |
c2147a50 | 790 | { |
196a15b4 | 791 | initcall_t *fn; |
c2147a50 | 792 | |
026cee00 | 793 | for (fn = __initcall_start; fn < __initcall0_start; fn++) |
196a15b4 | 794 | do_one_initcall(*fn); |
c2147a50 EGM |
795 | } |
796 | ||
a74fb73c | 797 | static int run_init_process(const char *init_filename) |
1da177e4 LT |
798 | { |
799 | argv_init[0] = init_filename; | |
a74fb73c | 800 | return kernel_execve(init_filename, argv_init, envp_init); |
1da177e4 LT |
801 | } |
802 | ||
d6b21238 AV |
803 | static void __init kernel_init_freeable(void); |
804 | ||
805 | static int __ref kernel_init(void *unused) | |
ee5bfa64 | 806 | { |
d6b21238 | 807 | kernel_init_freeable(); |
22a9d645 AV |
808 | /* need to finish all async __init code before freeing the memory */ |
809 | async_synchronize_full(); | |
ee5bfa64 | 810 | free_initmem(); |
ee5bfa64 VG |
811 | mark_rodata_ro(); |
812 | system_state = SYSTEM_RUNNING; | |
813 | numa_default_policy(); | |
814 | ||
fae5fa44 | 815 | current->signal->flags |= SIGNAL_UNKILLABLE; |
4a9d4b02 | 816 | flush_delayed_fput(); |
fae5fa44 | 817 | |
ee5bfa64 | 818 | if (ramdisk_execute_command) { |
a74fb73c AV |
819 | if (!run_init_process(ramdisk_execute_command)) |
820 | return 0; | |
ee5bfa64 VG |
821 | printk(KERN_WARNING "Failed to execute %s\n", |
822 | ramdisk_execute_command); | |
823 | } | |
824 | ||
825 | /* | |
826 | * We try each of these until one succeeds. | |
827 | * | |
828 | * The Bourne shell can be used instead of init if we are | |
829 | * trying to recover a really broken machine. | |
830 | */ | |
831 | if (execute_command) { | |
a74fb73c AV |
832 | if (!run_init_process(execute_command)) |
833 | return 0; | |
ee5bfa64 VG |
834 | printk(KERN_WARNING "Failed to execute %s. Attempting " |
835 | "defaults...\n", execute_command); | |
836 | } | |
a74fb73c AV |
837 | if (!run_init_process("/sbin/init") || |
838 | !run_init_process("/etc/init") || | |
839 | !run_init_process("/bin/init") || | |
840 | !run_init_process("/bin/sh")) | |
841 | return 0; | |
ee5bfa64 | 842 | |
9a85b8d6 AM |
843 | panic("No init found. Try passing init= option to kernel. " |
844 | "See Linux Documentation/init.txt for guidance."); | |
ee5bfa64 VG |
845 | } |
846 | ||
d6b21238 | 847 | static void __init kernel_init_freeable(void) |
1da177e4 | 848 | { |
b433c3d4 PZ |
849 | /* |
850 | * Wait until kthreadd is all set-up. | |
851 | */ | |
852 | wait_for_completion(&kthreadd_done); | |
31a67102 LT |
853 | |
854 | /* Now the scheduler is fully set up and can do blocking allocations */ | |
855 | gfp_allowed_mask = __GFP_BITS_MASK; | |
856 | ||
58568d2a MX |
857 | /* |
858 | * init can allocate pages on any node | |
859 | */ | |
3c466d46 | 860 | set_mems_allowed(node_states[N_MEMORY]); |
1da177e4 LT |
861 | /* |
862 | * init can run on any cpu. | |
863 | */ | |
1a2142af | 864 | set_cpus_allowed_ptr(current, cpu_all_mask); |
1da177e4 | 865 | |
9ec52099 CLG |
866 | cad_pid = task_pid(current); |
867 | ||
ca74a6f8 | 868 | smp_prepare_cpus(setup_max_cpus); |
1da177e4 LT |
869 | |
870 | do_pre_smp_initcalls(); | |
004417a6 | 871 | lockup_detector_init(); |
1da177e4 | 872 | |
1da177e4 LT |
873 | smp_init(); |
874 | sched_init_smp(); | |
875 | ||
1da177e4 LT |
876 | do_basic_setup(); |
877 | ||
2bd3a997 EB |
878 | /* Open the /dev/console on the rootfs, this should never fail */ |
879 | if (sys_open((const char __user *) "/dev/console", O_RDWR, 0) < 0) | |
880 | printk(KERN_WARNING "Warning: unable to open an initial console.\n"); | |
881 | ||
882 | (void) sys_dup(0); | |
883 | (void) sys_dup(0); | |
1da177e4 LT |
884 | /* |
885 | * check if there is an early userspace init. If yes, let it do all | |
886 | * the work | |
887 | */ | |
ffdfc409 OJ |
888 | |
889 | if (!ramdisk_execute_command) | |
890 | ramdisk_execute_command = "/init"; | |
891 | ||
892 | if (sys_access((const char __user *) ramdisk_execute_command, 0) != 0) { | |
893 | ramdisk_execute_command = NULL; | |
1da177e4 | 894 | prepare_namespace(); |
ffdfc409 | 895 | } |
1da177e4 LT |
896 | |
897 | /* | |
898 | * Ok, we have completed the initial bootup, and | |
899 | * we're essentially up and running. Get rid of the | |
900 | * initmem segments and start the user-mode stuff.. | |
901 | */ | |
1da177e4 | 902 | } |