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Commit | Line | Data |
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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 | |
dd4d9fec | 9 | * Simplified starting of init: Michael A. Griffith <grif@acm.org> |
1da177e4 LT |
10 | */ |
11 | ||
ea676e84 AM |
12 | #define DEBUG /* Enable initcall_debug */ |
13 | ||
1da177e4 | 14 | #include <linux/types.h> |
8a293be0 | 15 | #include <linux/extable.h> |
1da177e4 LT |
16 | #include <linux/module.h> |
17 | #include <linux/proc_fs.h> | |
5c2c5c55 | 18 | #include <linux/binfmts.h> |
1da177e4 LT |
19 | #include <linux/kernel.h> |
20 | #include <linux/syscalls.h> | |
9b5609fd | 21 | #include <linux/stackprotector.h> |
1da177e4 LT |
22 | #include <linux/string.h> |
23 | #include <linux/ctype.h> | |
24 | #include <linux/delay.h> | |
1da177e4 LT |
25 | #include <linux/ioport.h> |
26 | #include <linux/init.h> | |
1da177e4 | 27 | #include <linux/initrd.h> |
1da177e4 | 28 | #include <linux/bootmem.h> |
4a7a16dc | 29 | #include <linux/acpi.h> |
1da177e4 | 30 | #include <linux/tty.h> |
38b8d208 | 31 | #include <linux/nmi.h> |
1da177e4 LT |
32 | #include <linux/percpu.h> |
33 | #include <linux/kmod.h> | |
db64fe02 | 34 | #include <linux/vmalloc.h> |
1da177e4 | 35 | #include <linux/kernel_stat.h> |
d7cd5611 | 36 | #include <linux/start_kernel.h> |
1da177e4 | 37 | #include <linux/security.h> |
3d442233 | 38 | #include <linux/smp.h> |
1da177e4 LT |
39 | #include <linux/profile.h> |
40 | #include <linux/rcupdate.h> | |
41 | #include <linux/moduleparam.h> | |
42 | #include <linux/kallsyms.h> | |
43 | #include <linux/writeback.h> | |
44 | #include <linux/cpu.h> | |
45 | #include <linux/cpuset.h> | |
ddbcc7e8 | 46 | #include <linux/cgroup.h> |
1da177e4 | 47 | #include <linux/efi.h> |
906568c9 | 48 | #include <linux/tick.h> |
6168a702 | 49 | #include <linux/interrupt.h> |
c757249a | 50 | #include <linux/taskstats_kern.h> |
ca74e92b | 51 | #include <linux/delayacct.h> |
1da177e4 LT |
52 | #include <linux/unistd.h> |
53 | #include <linux/rmap.h> | |
54 | #include <linux/mempolicy.h> | |
55 | #include <linux/key.h> | |
b6cd0b77 | 56 | #include <linux/buffer_head.h> |
eefa864b | 57 | #include <linux/page_ext.h> |
9a11b49a | 58 | #include <linux/debug_locks.h> |
3ac7fe5a | 59 | #include <linux/debugobjects.h> |
fbb9ce95 | 60 | #include <linux/lockdep.h> |
3c7b4e6b | 61 | #include <linux/kmemleak.h> |
84d73786 | 62 | #include <linux/pid_namespace.h> |
1f21782e | 63 | #include <linux/device.h> |
73c27992 | 64 | #include <linux/kthread.h> |
e6fe6649 | 65 | #include <linux/sched.h> |
1777e463 | 66 | #include <linux/sched/init.h> |
a1c9eea9 | 67 | #include <linux/signal.h> |
199f0ca5 | 68 | #include <linux/idr.h> |
0b4b3827 | 69 | #include <linux/kgdb.h> |
68bf21aa | 70 | #include <linux/ftrace.h> |
22a9d645 | 71 | #include <linux/async.h> |
dfec072e | 72 | #include <linux/kmemcheck.h> |
6ae6996a | 73 | #include <linux/sfi.h> |
2b2af54a | 74 | #include <linux/shmem_fs.h> |
5a0e3ad6 | 75 | #include <linux/slab.h> |
24a24bb6 | 76 | #include <linux/perf_event.h> |
a74fb73c | 77 | #include <linux/ptrace.h> |
bb813f4c TH |
78 | #include <linux/blkdev.h> |
79 | #include <linux/elevator.h> | |
38ff87f7 | 80 | #include <linux/sched_clock.h> |
29930025 | 81 | #include <linux/sched/task.h> |
68db0cf1 | 82 | #include <linux/sched/task_stack.h> |
65f382fd | 83 | #include <linux/context_tracking.h> |
47d06e53 | 84 | #include <linux/random.h> |
7b0b73d7 | 85 | #include <linux/list.h> |
c9cd2ce2 | 86 | #include <linux/integrity.h> |
e149ed2b | 87 | #include <linux/proc_ns.h> |
0ddab1d2 | 88 | #include <linux/io.h> |
39290b38 | 89 | #include <linux/cache.h> |
2959a5f7 | 90 | #include <linux/rodata_test.h> |
1da177e4 LT |
91 | |
92 | #include <asm/io.h> | |
93 | #include <asm/bugs.h> | |
94 | #include <asm/setup.h> | |
a940199f | 95 | #include <asm/sections.h> |
37b73c82 | 96 | #include <asm/cacheflush.h> |
1da177e4 | 97 | |
aae5f662 | 98 | static int kernel_init(void *); |
1da177e4 LT |
99 | |
100 | extern void init_IRQ(void); | |
ff691f6e | 101 | extern void fork_init(void); |
1da177e4 | 102 | extern void radix_tree_init(void); |
1da177e4 | 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 | 125 | |
30d7e0d4 ABL |
126 | /* Untouched command line saved by arch-specific code. */ |
127 | char __initdata boot_command_line[COMMAND_LINE_SIZE]; | |
128 | /* Untouched saved command line (eg. for /proc) */ | |
129 | char *saved_command_line; | |
130 | /* Command line for parameter parsing */ | |
131 | static char *static_command_line; | |
08746a65 KM |
132 | /* Command line for per-initcall parameter parsing */ |
133 | static char *initcall_command_line; | |
1da177e4 LT |
134 | |
135 | static char *execute_command; | |
ffdfc409 | 136 | static char *ramdisk_execute_command; |
1da177e4 | 137 | |
c4b2c0c5 HFS |
138 | /* |
139 | * Used to generate warnings if static_key manipulation functions are used | |
140 | * before jump_label_init is called. | |
141 | */ | |
dd4d9fec | 142 | bool static_key_initialized __read_mostly; |
c4b2c0c5 HFS |
143 | EXPORT_SYMBOL_GPL(static_key_initialized); |
144 | ||
8b3b2955 JB |
145 | /* |
146 | * If set, this is an indication to the drivers that reset the underlying | |
147 | * device before going ahead with the initialization otherwise driver might | |
148 | * rely on the BIOS and skip the reset operation. | |
149 | * | |
150 | * This is useful if kernel is booting in an unreliable environment. | |
fc454fdc | 151 | * For ex. kdump situation where previous kernel has crashed, BIOS has been |
8b3b2955 JB |
152 | * skipped and devices will be in unknown state. |
153 | */ | |
154 | unsigned int reset_devices; | |
155 | EXPORT_SYMBOL(reset_devices); | |
1da177e4 | 156 | |
7e96287d VG |
157 | static int __init set_reset_devices(char *str) |
158 | { | |
159 | reset_devices = 1; | |
160 | return 1; | |
161 | } | |
162 | ||
163 | __setup("reset_devices", set_reset_devices); | |
164 | ||
dd4d9fec FF |
165 | static const char *argv_init[MAX_INIT_ARGS+2] = { "init", NULL, }; |
166 | const char *envp_init[MAX_INIT_ENVS+2] = { "HOME=/", "TERM=linux", NULL, }; | |
1da177e4 LT |
167 | static const char *panic_later, *panic_param; |
168 | ||
914dcaa8 | 169 | extern const struct obs_kernel_param __setup_start[], __setup_end[]; |
1da177e4 | 170 | |
31c025b5 | 171 | static bool __init obsolete_checksetup(char *line) |
1da177e4 | 172 | { |
914dcaa8 | 173 | const struct obs_kernel_param *p; |
31c025b5 | 174 | bool had_early_param = false; |
1da177e4 LT |
175 | |
176 | p = __setup_start; | |
177 | do { | |
178 | int n = strlen(p->str); | |
b1e4d20c | 179 | if (parameqn(line, p->str, n)) { |
1da177e4 | 180 | if (p->early) { |
33df0d19 RR |
181 | /* Already done in parse_early_param? |
182 | * (Needs exact match on param part). | |
183 | * Keep iterating, as we can have early | |
184 | * params and __setups of same names 8( */ | |
1da177e4 | 185 | if (line[n] == '\0' || line[n] == '=') |
31c025b5 | 186 | had_early_param = true; |
1da177e4 | 187 | } else if (!p->setup_func) { |
ea676e84 AM |
188 | pr_warn("Parameter %s is obsolete, ignored\n", |
189 | p->str); | |
31c025b5 | 190 | return true; |
1da177e4 | 191 | } else if (p->setup_func(line + n)) |
31c025b5 | 192 | return true; |
1da177e4 LT |
193 | } |
194 | p++; | |
195 | } while (p < __setup_end); | |
33df0d19 RR |
196 | |
197 | return had_early_param; | |
1da177e4 LT |
198 | } |
199 | ||
200 | /* | |
201 | * This should be approx 2 Bo*oMips to start (note initial shift), and will | |
202 | * still work even if initially too large, it will just take slightly longer | |
203 | */ | |
204 | unsigned long loops_per_jiffy = (1<<12); | |
1da177e4 LT |
205 | EXPORT_SYMBOL(loops_per_jiffy); |
206 | ||
207 | static int __init debug_kernel(char *str) | |
208 | { | |
a8fe19eb | 209 | console_loglevel = CONSOLE_LOGLEVEL_DEBUG; |
f6f21c81 | 210 | return 0; |
1da177e4 LT |
211 | } |
212 | ||
213 | static int __init quiet_kernel(char *str) | |
214 | { | |
a8fe19eb | 215 | console_loglevel = CONSOLE_LOGLEVEL_QUIET; |
f6f21c81 | 216 | return 0; |
1da177e4 LT |
217 | } |
218 | ||
f6f21c81 YL |
219 | early_param("debug", debug_kernel); |
220 | early_param("quiet", quiet_kernel); | |
1da177e4 LT |
221 | |
222 | static int __init loglevel(char *str) | |
223 | { | |
808bf29b AS |
224 | int newlevel; |
225 | ||
226 | /* | |
227 | * Only update loglevel value when a correct setting was passed, | |
228 | * to prevent blind crashes (when loglevel being set to 0) that | |
229 | * are quite hard to debug | |
230 | */ | |
231 | if (get_option(&str, &newlevel)) { | |
232 | console_loglevel = newlevel; | |
233 | return 0; | |
234 | } | |
235 | ||
236 | return -EINVAL; | |
1da177e4 LT |
237 | } |
238 | ||
f6f21c81 | 239 | early_param("loglevel", loglevel); |
1da177e4 | 240 | |
a99cd112 | 241 | /* Change NUL term back to "=", to make "param" the whole string. */ |
ecc86170 LR |
242 | static int __init repair_env_string(char *param, char *val, |
243 | const char *unused, void *arg) | |
1da177e4 | 244 | { |
1da177e4 LT |
245 | if (val) { |
246 | /* param=val or param="val"? */ | |
247 | if (val == param+strlen(param)+1) | |
248 | val[-1] = '='; | |
249 | else if (val == param+strlen(param)+2) { | |
250 | val[-2] = '='; | |
251 | memmove(val-1, val, strlen(val)+1); | |
252 | val--; | |
253 | } else | |
254 | BUG(); | |
255 | } | |
a99cd112 CM |
256 | return 0; |
257 | } | |
258 | ||
51e158c1 | 259 | /* Anything after -- gets handed straight to init. */ |
ecc86170 LR |
260 | static int __init set_init_arg(char *param, char *val, |
261 | const char *unused, void *arg) | |
51e158c1 RR |
262 | { |
263 | unsigned int i; | |
264 | ||
265 | if (panic_later) | |
266 | return 0; | |
267 | ||
ecc86170 | 268 | repair_env_string(param, val, unused, NULL); |
51e158c1 RR |
269 | |
270 | for (i = 0; argv_init[i]; i++) { | |
271 | if (i == MAX_INIT_ARGS) { | |
272 | panic_later = "init"; | |
273 | panic_param = param; | |
274 | return 0; | |
275 | } | |
276 | } | |
277 | argv_init[i] = param; | |
278 | return 0; | |
279 | } | |
280 | ||
a99cd112 CM |
281 | /* |
282 | * Unknown boot options get handed to init, unless they look like | |
283 | * unused parameters (modprobe will find them in /proc/cmdline). | |
284 | */ | |
ecc86170 LR |
285 | static int __init unknown_bootoption(char *param, char *val, |
286 | const char *unused, void *arg) | |
a99cd112 | 287 | { |
ecc86170 | 288 | repair_env_string(param, val, unused, NULL); |
1da177e4 LT |
289 | |
290 | /* Handle obsolete-style parameters */ | |
291 | if (obsolete_checksetup(param)) | |
292 | return 0; | |
293 | ||
f066a4f6 RR |
294 | /* Unused module parameter. */ |
295 | if (strchr(param, '.') && (!val || strchr(param, '.') < val)) | |
1da177e4 | 296 | return 0; |
1da177e4 LT |
297 | |
298 | if (panic_later) | |
299 | return 0; | |
300 | ||
301 | if (val) { | |
302 | /* Environment option */ | |
303 | unsigned int i; | |
304 | for (i = 0; envp_init[i]; i++) { | |
305 | if (i == MAX_INIT_ENVS) { | |
499a4584 | 306 | panic_later = "env"; |
1da177e4 LT |
307 | panic_param = param; |
308 | } | |
309 | if (!strncmp(param, envp_init[i], val - param)) | |
310 | break; | |
311 | } | |
312 | envp_init[i] = param; | |
313 | } else { | |
314 | /* Command line option */ | |
315 | unsigned int i; | |
316 | for (i = 0; argv_init[i]; i++) { | |
317 | if (i == MAX_INIT_ARGS) { | |
499a4584 | 318 | panic_later = "init"; |
1da177e4 LT |
319 | panic_param = param; |
320 | } | |
321 | } | |
322 | argv_init[i] = param; | |
323 | } | |
324 | return 0; | |
325 | } | |
326 | ||
327 | static int __init init_setup(char *str) | |
328 | { | |
329 | unsigned int i; | |
330 | ||
331 | execute_command = str; | |
332 | /* | |
333 | * In case LILO is going to boot us with default command line, | |
334 | * it prepends "auto" before the whole cmdline which makes | |
335 | * the shell think it should execute a script with such name. | |
336 | * So we ignore all arguments entered _before_ init=... [MJ] | |
337 | */ | |
338 | for (i = 1; i < MAX_INIT_ARGS; i++) | |
339 | argv_init[i] = NULL; | |
340 | return 1; | |
341 | } | |
342 | __setup("init=", init_setup); | |
343 | ||
ffdfc409 OJ |
344 | static int __init rdinit_setup(char *str) |
345 | { | |
346 | unsigned int i; | |
347 | ||
348 | ramdisk_execute_command = str; | |
349 | /* See "auto" comment in init_setup */ | |
350 | for (i = 1; i < MAX_INIT_ARGS; i++) | |
351 | argv_init[i] = NULL; | |
352 | return 1; | |
353 | } | |
354 | __setup("rdinit=", rdinit_setup); | |
355 | ||
1da177e4 | 356 | #ifndef CONFIG_SMP |
34db18a0 | 357 | static const unsigned int setup_max_cpus = NR_CPUS; |
e0982e90 | 358 | static inline void setup_nr_cpu_ids(void) { } |
1da177e4 | 359 | static inline void smp_prepare_cpus(unsigned int maxcpus) { } |
1da177e4 LT |
360 | #endif |
361 | ||
30d7e0d4 ABL |
362 | /* |
363 | * We need to store the untouched command line for future reference. | |
364 | * We also need to store the touched command line since the parameter | |
365 | * parsing is performed in place, and we should allow a component to | |
366 | * store reference of name/value for future reference. | |
367 | */ | |
368 | static void __init setup_command_line(char *command_line) | |
369 | { | |
098b081b SS |
370 | saved_command_line = |
371 | memblock_virt_alloc(strlen(boot_command_line) + 1, 0); | |
372 | initcall_command_line = | |
373 | memblock_virt_alloc(strlen(boot_command_line) + 1, 0); | |
374 | static_command_line = memblock_virt_alloc(strlen(command_line) + 1, 0); | |
dd4d9fec FF |
375 | strcpy(saved_command_line, boot_command_line); |
376 | strcpy(static_command_line, command_line); | |
30d7e0d4 ABL |
377 | } |
378 | ||
1da177e4 LT |
379 | /* |
380 | * We need to finalize in a non-__init function or else race conditions | |
381 | * between the root thread and the init thread may cause start_kernel to | |
382 | * be reaped by free_initmem before the root thread has proceeded to | |
383 | * cpu_idle. | |
384 | * | |
385 | * gcc-3.4 accidentally inlines this function, so use noinline. | |
386 | */ | |
387 | ||
b433c3d4 PZ |
388 | static __initdata DECLARE_COMPLETION(kthreadd_done); |
389 | ||
bd721ea7 | 390 | static noinline void __ref rest_init(void) |
1da177e4 | 391 | { |
73c27992 EB |
392 | int pid; |
393 | ||
7db905e6 | 394 | rcu_scheduler_starting(); |
b433c3d4 | 395 | /* |
97158569 | 396 | * We need to spawn init first so that it obtains pid 1, however |
b433c3d4 PZ |
397 | * the init task will end up wanting to create kthreads, which, if |
398 | * we schedule it before we create kthreadd, will OOPS. | |
399 | */ | |
34a1b723 | 400 | kernel_thread(kernel_init, NULL, CLONE_FS); |
1da177e4 | 401 | numa_default_policy(); |
73c27992 | 402 | pid = kernel_thread(kthreadd, NULL, CLONE_FS | CLONE_FILES); |
d11c563d | 403 | rcu_read_lock(); |
5cd20455 | 404 | kthreadd_task = find_task_by_pid_ns(pid, &init_pid_ns); |
d11c563d | 405 | rcu_read_unlock(); |
b433c3d4 | 406 | complete(&kthreadd_done); |
f340c0d1 IM |
407 | |
408 | /* | |
409 | * The boot idle thread must execute schedule() | |
1df21055 | 410 | * at least once to get things moving: |
f340c0d1 | 411 | */ |
1df21055 | 412 | init_idle_bootup_task(current); |
bd2f5536 | 413 | schedule_preempt_disabled(); |
5bfb5d69 | 414 | /* Call into cpu_idle with preempt disabled */ |
a1a04ec3 | 415 | cpu_startup_entry(CPUHP_ONLINE); |
1df21055 | 416 | } |
1da177e4 LT |
417 | |
418 | /* Check for early params. */ | |
ecc86170 LR |
419 | static int __init do_early_param(char *param, char *val, |
420 | const char *unused, void *arg) | |
1da177e4 | 421 | { |
914dcaa8 | 422 | const struct obs_kernel_param *p; |
1da177e4 LT |
423 | |
424 | for (p = __setup_start; p < __setup_end; p++) { | |
b1e4d20c | 425 | if ((p->early && parameq(param, p->str)) || |
18a8bd94 YL |
426 | (strcmp(param, "console") == 0 && |
427 | strcmp(p->str, "earlycon") == 0) | |
428 | ) { | |
1da177e4 | 429 | if (p->setup_func(val) != 0) |
ea676e84 | 430 | pr_warn("Malformed early option '%s'\n", param); |
1da177e4 LT |
431 | } |
432 | } | |
433 | /* We accept everything at this stage. */ | |
434 | return 0; | |
435 | } | |
436 | ||
13977091 MD |
437 | void __init parse_early_options(char *cmdline) |
438 | { | |
ecc86170 LR |
439 | parse_args("early options", cmdline, NULL, 0, 0, 0, NULL, |
440 | do_early_param); | |
13977091 MD |
441 | } |
442 | ||
1da177e4 LT |
443 | /* Arch code calls this early on, or if not, just before other parsing. */ |
444 | void __init parse_early_param(void) | |
445 | { | |
dd4d9fec FF |
446 | static int done __initdata; |
447 | static char tmp_cmdline[COMMAND_LINE_SIZE] __initdata; | |
1da177e4 LT |
448 | |
449 | if (done) | |
450 | return; | |
451 | ||
452 | /* All fall through to do_early_param. */ | |
30d7e0d4 | 453 | strlcpy(tmp_cmdline, boot_command_line, COMMAND_LINE_SIZE); |
13977091 | 454 | parse_early_options(tmp_cmdline); |
1da177e4 LT |
455 | done = 1; |
456 | } | |
457 | ||
e7ff3a47 TG |
458 | void __init __weak arch_post_acpi_subsys_init(void) { } |
459 | ||
839ad62e | 460 | void __init __weak smp_setup_processor_id(void) |
033ab7f8 AM |
461 | { |
462 | } | |
463 | ||
eded09cc | 464 | # if THREAD_SIZE >= PAGE_SIZE |
b235beea | 465 | void __init __weak thread_stack_cache_init(void) |
8c9843e5 BH |
466 | { |
467 | } | |
eded09cc | 468 | #endif |
8c9843e5 | 469 | |
444f478f PE |
470 | /* |
471 | * Set up kernel memory allocators | |
472 | */ | |
473 | static void __init mm_init(void) | |
474 | { | |
eefa864b JK |
475 | /* |
476 | * page_ext requires contiguous pages, | |
477 | * bigger than MAX_ORDER unless SPARSEMEM. | |
478 | */ | |
479 | page_ext_init_flatmem(); | |
444f478f PE |
480 | mem_init(); |
481 | kmem_cache_init(); | |
099a19d9 | 482 | percpu_init_late(); |
b35f1819 | 483 | pgtable_init(); |
444f478f | 484 | vmalloc_init(); |
0ddab1d2 | 485 | ioremap_huge_init(); |
444f478f PE |
486 | } |
487 | ||
722a9f92 | 488 | asmlinkage __visible void __init start_kernel(void) |
1da177e4 | 489 | { |
dd4d9fec FF |
490 | char *command_line; |
491 | char *after_dashes; | |
033ab7f8 | 492 | |
d4311ff1 | 493 | set_task_stack_end_magic(&init_task); |
73839c5b | 494 | smp_setup_processor_id(); |
3ac7fe5a | 495 | debug_objects_early_init(); |
42059429 IM |
496 | |
497 | /* | |
6623f1c6 | 498 | * Set up the initial canary ASAP: |
42059429 IM |
499 | */ |
500 | boot_init_stack_canary(); | |
501 | ||
ddbcc7e8 | 502 | cgroup_init_early(); |
fbb9ce95 IM |
503 | |
504 | local_irq_disable(); | |
2ce802f6 | 505 | early_boot_irqs_disabled = true; |
fbb9ce95 | 506 | |
1b3b3b49 VK |
507 | /* |
508 | * Interrupts are still disabled. Do necessary setups, then | |
509 | * enable them. | |
510 | */ | |
44fd2299 | 511 | boot_cpu_init(); |
1da177e4 | 512 | page_address_init(); |
ea676e84 | 513 | pr_notice("%s", linux_banner); |
1da177e4 | 514 | setup_arch(&command_line); |
6345d24d | 515 | mm_init_cpumask(&init_mm); |
30d7e0d4 | 516 | setup_command_line(command_line); |
e0982e90 | 517 | setup_nr_cpu_ids(); |
d6647bdf | 518 | setup_per_cpu_areas(); |
cff7d378 | 519 | boot_cpu_state_init(); |
44fd2299 | 520 | smp_prepare_boot_cpu(); /* arch-specific boot-cpu hooks */ |
1da177e4 | 521 | |
9adb62a5 | 522 | build_all_zonelists(NULL, NULL); |
83b519e8 PE |
523 | page_alloc_init(); |
524 | ||
ea676e84 | 525 | pr_notice("Kernel command line: %s\n", boot_command_line); |
83b519e8 | 526 | parse_early_param(); |
51e158c1 RR |
527 | after_dashes = parse_args("Booting kernel", |
528 | static_command_line, __start___param, | |
529 | __stop___param - __start___param, | |
ecc86170 | 530 | -1, -1, NULL, &unknown_bootoption); |
3438cf54 | 531 | if (!IS_ERR_OR_NULL(after_dashes)) |
51e158c1 | 532 | parse_args("Setting init args", after_dashes, NULL, 0, -1, -1, |
ecc86170 | 533 | NULL, set_init_arg); |
97ce2c88 JF |
534 | |
535 | jump_label_init(); | |
536 | ||
83b519e8 PE |
537 | /* |
538 | * These use large bootmem allocations and must precede | |
539 | * kmem_cache_init() | |
540 | */ | |
162a7e75 | 541 | setup_log_buf(0); |
83b519e8 | 542 | pidhash_init(); |
83b519e8 PE |
543 | vfs_caches_init_early(); |
544 | sort_main_extable(); | |
545 | trap_init(); | |
444f478f | 546 | mm_init(); |
de03c72c | 547 | |
1da177e4 LT |
548 | /* |
549 | * Set up the scheduler prior starting any interrupts (such as the | |
550 | * timer interrupt). Full topology setup happens at smp_init() | |
551 | * time - but meanwhile we still have a functioning scheduler. | |
552 | */ | |
553 | sched_init(); | |
554 | /* | |
555 | * Disable preemption - early bootup scheduling is extremely | |
556 | * fragile until we cpu_idle() for the first time. | |
557 | */ | |
558 | preempt_disable(); | |
dd4d9fec FF |
559 | if (WARN(!irqs_disabled(), |
560 | "Interrupts were enabled *very* early, fixing it\n")) | |
c4a68306 | 561 | local_irq_disable(); |
0a835c4f | 562 | radix_tree_init(); |
3347fa09 TH |
563 | |
564 | /* | |
565 | * Allow workqueue creation and work item queueing/cancelling | |
566 | * early. Work item execution depends on kthreads and starts after | |
567 | * workqueue_init(). | |
568 | */ | |
569 | workqueue_init_early(); | |
570 | ||
1da177e4 | 571 | rcu_init(); |
5f893b26 SRRH |
572 | |
573 | /* trace_printk() and trace points may be used after this */ | |
574 | trace_init(); | |
575 | ||
65f382fd | 576 | context_tracking_init(); |
0b8f1efa YL |
577 | /* init some links before init_ISA_irqs() */ |
578 | early_irq_init(); | |
1da177e4 | 579 | init_IRQ(); |
ad2b1353 | 580 | tick_init(); |
d6dd50e0 | 581 | rcu_init_nohz(); |
1da177e4 | 582 | init_timers(); |
c0a31329 | 583 | hrtimers_init(); |
1da177e4 | 584 | softirq_init(); |
ad596171 | 585 | timekeeping_init(); |
88fecaa2 | 586 | time_init(); |
38ff87f7 | 587 | sched_clock_postinit(); |
f92bac3b | 588 | printk_safe_init(); |
9e630205 | 589 | perf_event_init(); |
93e02814 | 590 | profile_init(); |
d8ad7d11 | 591 | call_function_init(); |
f91eb62f | 592 | WARN(!irqs_disabled(), "Interrupts were enabled early\n"); |
2ce802f6 | 593 | early_boot_irqs_disabled = false; |
93e02814 | 594 | local_irq_enable(); |
dcce284a | 595 | |
7e85ee0c | 596 | kmem_cache_init_late(); |
1da177e4 LT |
597 | |
598 | /* | |
599 | * HACK ALERT! This is early. We're enabling the console before | |
600 | * we've done PCI setups etc, and console_init() must be aware of | |
601 | * this. But we do want output early, in case something goes wrong. | |
602 | */ | |
603 | console_init(); | |
604 | if (panic_later) | |
499a4584 TH |
605 | panic("Too many boot %s vars at `%s'", panic_later, |
606 | panic_param); | |
fbb9ce95 IM |
607 | |
608 | lockdep_info(); | |
609 | ||
9a11b49a IM |
610 | /* |
611 | * Need to run this when irqs are enabled, because it wants | |
612 | * to self-test [hard/soft]-irqs on/off lock inversion bugs | |
613 | * too: | |
614 | */ | |
615 | locking_selftest(); | |
616 | ||
1da177e4 LT |
617 | #ifdef CONFIG_BLK_DEV_INITRD |
618 | if (initrd_start && !initrd_below_start_ok && | |
bd673c7c | 619 | page_to_pfn(virt_to_page((void *)initrd_start)) < min_low_pfn) { |
ea676e84 | 620 | pr_crit("initrd overwritten (0x%08lx < 0x%08lx) - disabling it.\n", |
bd673c7c GU |
621 | page_to_pfn(virt_to_page((void *)initrd_start)), |
622 | min_low_pfn); | |
1da177e4 LT |
623 | initrd_start = 0; |
624 | } | |
625 | #endif | |
fe53ca54 | 626 | page_ext_init(); |
3ac7fe5a | 627 | debug_objects_mem_init(); |
9b090f2d | 628 | kmemleak_init(); |
e7c8d5c9 | 629 | setup_per_cpu_pageset(); |
1da177e4 LT |
630 | numa_policy_init(); |
631 | if (late_time_init) | |
632 | late_time_init(); | |
633 | calibrate_delay(); | |
634 | pidmap_init(); | |
1da177e4 | 635 | anon_vma_init(); |
c4e1acbb | 636 | acpi_early_init(); |
11520e5e | 637 | #ifdef CONFIG_X86 |
83e68189 | 638 | if (efi_enabled(EFI_RUNTIME_SERVICES)) |
11520e5e | 639 | efi_enter_virtual_mode(); |
3891a04a | 640 | #endif |
197725de | 641 | #ifdef CONFIG_X86_ESPFIX64 |
3891a04a PA |
642 | /* Should be run before the first non-init thread is created */ |
643 | init_espfix_bsp(); | |
11520e5e | 644 | #endif |
b235beea | 645 | thread_stack_cache_init(); |
d84f4f99 | 646 | cred_init(); |
ff691f6e | 647 | fork_init(); |
1da177e4 LT |
648 | proc_caches_init(); |
649 | buffer_init(); | |
1da177e4 LT |
650 | key_init(); |
651 | security_init(); | |
0b4b3827 | 652 | dbg_late_init(); |
4248b0da | 653 | vfs_caches_init(); |
62906027 | 654 | pagecache_init(); |
1da177e4 | 655 | signals_init(); |
1da177e4 | 656 | proc_root_init(); |
e149ed2b | 657 | nsfs_init(); |
1da177e4 | 658 | cpuset_init(); |
695df213 | 659 | cgroup_init(); |
c757249a | 660 | taskstats_init_early(); |
ca74e92b | 661 | delayacct_init(); |
1da177e4 LT |
662 | |
663 | check_bugs(); | |
664 | ||
b064a8fa | 665 | acpi_subsystem_init(); |
e7ff3a47 | 666 | arch_post_acpi_subsys_init(); |
6ae6996a | 667 | sfi_init_late(); |
1da177e4 | 668 | |
83e68189 | 669 | if (efi_enabled(EFI_RUNTIME_SERVICES)) { |
78510792 | 670 | efi_free_boot_services(); |
2223af38 | 671 | } |
78510792 | 672 | |
68bf21aa SR |
673 | ftrace_init(); |
674 | ||
1da177e4 LT |
675 | /* Do the rest non-__init'ed, we're now alive */ |
676 | rest_init(); | |
677 | } | |
678 | ||
b99b87f7 PO |
679 | /* Call all constructor functions linked into the kernel. */ |
680 | static void __init do_ctors(void) | |
681 | { | |
682 | #ifdef CONFIG_CONSTRUCTORS | |
196a15b4 | 683 | ctor_fn_t *fn = (ctor_fn_t *) __ctors_start; |
b99b87f7 | 684 | |
196a15b4 HS |
685 | for (; fn < (ctor_fn_t *) __ctors_end; fn++) |
686 | (*fn)(); | |
b99b87f7 PO |
687 | #endif |
688 | } | |
689 | ||
2329abfa | 690 | bool initcall_debug; |
d0ea3d7d | 691 | core_param(initcall_debug, initcall_debug, bool, 0644); |
1da177e4 | 692 | |
7b0b73d7 PB |
693 | #ifdef CONFIG_KALLSYMS |
694 | struct blacklist_entry { | |
695 | struct list_head next; | |
696 | char *buf; | |
697 | }; | |
698 | ||
699 | static __initdata_or_module LIST_HEAD(blacklisted_initcalls); | |
700 | ||
701 | static int __init initcall_blacklist(char *str) | |
702 | { | |
703 | char *str_entry; | |
704 | struct blacklist_entry *entry; | |
705 | ||
706 | /* str argument is a comma-separated list of functions */ | |
707 | do { | |
708 | str_entry = strsep(&str, ","); | |
709 | if (str_entry) { | |
710 | pr_debug("blacklisting initcall %s\n", str_entry); | |
711 | entry = alloc_bootmem(sizeof(*entry)); | |
712 | entry->buf = alloc_bootmem(strlen(str_entry) + 1); | |
713 | strcpy(entry->buf, str_entry); | |
714 | list_add(&entry->next, &blacklisted_initcalls); | |
715 | } | |
716 | } while (str_entry); | |
717 | ||
718 | return 0; | |
719 | } | |
720 | ||
721 | static bool __init_or_module initcall_blacklisted(initcall_t fn) | |
722 | { | |
7b0b73d7 | 723 | struct blacklist_entry *entry; |
c8cdd2be | 724 | char fn_name[KSYM_SYMBOL_LEN]; |
0fd5ed8d | 725 | unsigned long addr; |
7b0b73d7 | 726 | |
c8cdd2be | 727 | if (list_empty(&blacklisted_initcalls)) |
7b0b73d7 PB |
728 | return false; |
729 | ||
0fd5ed8d RV |
730 | addr = (unsigned long) dereference_function_descriptor(fn); |
731 | sprint_symbol_no_offset(fn_name, addr); | |
c8cdd2be | 732 | |
841c06d7 PB |
733 | /* |
734 | * fn will be "function_name [module_name]" where [module_name] is not | |
735 | * displayed for built-in init functions. Strip off the [module_name]. | |
736 | */ | |
737 | strreplace(fn_name, ' ', '\0'); | |
738 | ||
e6fd1fb3 | 739 | list_for_each_entry(entry, &blacklisted_initcalls, next) { |
7b0b73d7 PB |
740 | if (!strcmp(fn_name, entry->buf)) { |
741 | pr_debug("initcall %s blacklisted\n", fn_name); | |
7b0b73d7 PB |
742 | return true; |
743 | } | |
744 | } | |
745 | ||
7b0b73d7 PB |
746 | return false; |
747 | } | |
748 | #else | |
749 | static int __init initcall_blacklist(char *str) | |
750 | { | |
751 | pr_warn("initcall_blacklist requires CONFIG_KALLSYMS\n"); | |
752 | return 0; | |
753 | } | |
754 | ||
755 | static bool __init_or_module initcall_blacklisted(initcall_t fn) | |
756 | { | |
757 | return false; | |
758 | } | |
759 | #endif | |
760 | __setup("initcall_blacklist=", initcall_blacklist); | |
761 | ||
e4461271 | 762 | static int __init_or_module do_one_initcall_debug(initcall_t fn) |
1da177e4 | 763 | { |
74239072 | 764 | ktime_t calltime, delta, rettime; |
30dbb20e AW |
765 | unsigned long long duration; |
766 | int ret; | |
1da177e4 | 767 | |
d62cf815 | 768 | printk(KERN_DEBUG "calling %pF @ %i\n", fn, task_pid_nr(current)); |
22c5c03b | 769 | calltime = ktime_get(); |
30dbb20e | 770 | ret = fn(); |
22c5c03b KW |
771 | rettime = ktime_get(); |
772 | delta = ktime_sub(rettime, calltime); | |
773 | duration = (unsigned long long) ktime_to_ns(delta) >> 10; | |
d62cf815 | 774 | printk(KERN_DEBUG "initcall %pF returned %d after %lld usecs\n", |
ea676e84 | 775 | fn, ret, duration); |
1da177e4 | 776 | |
22c5c03b KW |
777 | return ret; |
778 | } | |
779 | ||
e4461271 | 780 | int __init_or_module do_one_initcall(initcall_t fn) |
22c5c03b KW |
781 | { |
782 | int count = preempt_count(); | |
783 | int ret; | |
ff1c8fac | 784 | char msgbuf[64]; |
22c5c03b | 785 | |
7b0b73d7 PB |
786 | if (initcall_blacklisted(fn)) |
787 | return -EPERM; | |
788 | ||
22c5c03b KW |
789 | if (initcall_debug) |
790 | ret = do_one_initcall_debug(fn); | |
791 | else | |
792 | ret = fn(); | |
8f0c45cd | 793 | |
e0df154f | 794 | msgbuf[0] = 0; |
e662e1cf | 795 | |
e0df154f | 796 | if (preempt_count() != count) { |
bf5d770b | 797 | sprintf(msgbuf, "preemption imbalance "); |
4a2b4b22 | 798 | preempt_count_set(count); |
1da177e4 | 799 | } |
e0df154f | 800 | if (irqs_disabled()) { |
a76bfd0d | 801 | strlcat(msgbuf, "disabled interrupts ", sizeof(msgbuf)); |
e0df154f LT |
802 | local_irq_enable(); |
803 | } | |
f91eb62f | 804 | WARN(msgbuf[0], "initcall %pF returned with %s\n", fn, msgbuf); |
59f9415f | 805 | |
38addce8 | 806 | add_latent_entropy(); |
30dbb20e | 807 | return ret; |
e0df154f LT |
808 | } |
809 | ||
810 | ||
026cee00 PM |
811 | extern initcall_t __initcall_start[]; |
812 | extern initcall_t __initcall0_start[]; | |
813 | extern initcall_t __initcall1_start[]; | |
814 | extern initcall_t __initcall2_start[]; | |
815 | extern initcall_t __initcall3_start[]; | |
816 | extern initcall_t __initcall4_start[]; | |
817 | extern initcall_t __initcall5_start[]; | |
818 | extern initcall_t __initcall6_start[]; | |
819 | extern initcall_t __initcall7_start[]; | |
820 | extern initcall_t __initcall_end[]; | |
821 | ||
822 | static initcall_t *initcall_levels[] __initdata = { | |
823 | __initcall0_start, | |
824 | __initcall1_start, | |
825 | __initcall2_start, | |
826 | __initcall3_start, | |
827 | __initcall4_start, | |
828 | __initcall5_start, | |
829 | __initcall6_start, | |
830 | __initcall7_start, | |
831 | __initcall_end, | |
832 | }; | |
833 | ||
96263d28 | 834 | /* Keep these in sync with initcalls in include/linux/init.h */ |
026cee00 | 835 | static char *initcall_level_names[] __initdata = { |
9fb48c74 JC |
836 | "early", |
837 | "core", | |
838 | "postcore", | |
839 | "arch", | |
840 | "subsys", | |
841 | "fs", | |
842 | "device", | |
843 | "late", | |
026cee00 PM |
844 | }; |
845 | ||
026cee00 | 846 | static void __init do_initcall_level(int level) |
e0df154f | 847 | { |
196a15b4 | 848 | initcall_t *fn; |
e0df154f | 849 | |
08746a65 | 850 | strcpy(initcall_command_line, saved_command_line); |
026cee00 | 851 | parse_args(initcall_level_names[level], |
08746a65 | 852 | initcall_command_line, __start___param, |
026cee00 PM |
853 | __stop___param - __start___param, |
854 | level, level, | |
ecc86170 | 855 | NULL, &repair_env_string); |
026cee00 PM |
856 | |
857 | for (fn = initcall_levels[level]; fn < initcall_levels[level+1]; fn++) | |
196a15b4 | 858 | do_one_initcall(*fn); |
1da177e4 LT |
859 | } |
860 | ||
026cee00 PM |
861 | static void __init do_initcalls(void) |
862 | { | |
863 | int level; | |
864 | ||
19efb72f | 865 | for (level = 0; level < ARRAY_SIZE(initcall_levels) - 1; level++) |
026cee00 PM |
866 | do_initcall_level(level); |
867 | } | |
868 | ||
1da177e4 LT |
869 | /* |
870 | * Ok, the machine is now initialized. None of the devices | |
871 | * have been touched yet, but the CPU subsystem is up and | |
872 | * running, and memory and process management works. | |
873 | * | |
874 | * Now we can finally start doing some real work.. | |
875 | */ | |
876 | static void __init do_basic_setup(void) | |
877 | { | |
759ee091 | 878 | cpuset_init_smp(); |
41ffe5d5 | 879 | shmem_init(); |
1da177e4 | 880 | driver_init(); |
b04c3afb | 881 | init_irq_proc(); |
b99b87f7 | 882 | do_ctors(); |
d5767c53 | 883 | usermodehelper_enable(); |
b0f84374 | 884 | do_initcalls(); |
1da177e4 LT |
885 | } |
886 | ||
7babe8db | 887 | static void __init do_pre_smp_initcalls(void) |
c2147a50 | 888 | { |
196a15b4 | 889 | initcall_t *fn; |
c2147a50 | 890 | |
026cee00 | 891 | for (fn = __initcall_start; fn < __initcall0_start; fn++) |
196a15b4 | 892 | do_one_initcall(*fn); |
c2147a50 EGM |
893 | } |
894 | ||
bb813f4c TH |
895 | /* |
896 | * This function requests modules which should be loaded by default and is | |
897 | * called twice right after initrd is mounted and right before init is | |
898 | * exec'd. If such modules are on either initrd or rootfs, they will be | |
899 | * loaded before control is passed to userland. | |
900 | */ | |
901 | void __init load_default_modules(void) | |
902 | { | |
903 | load_default_elevator_module(); | |
904 | } | |
905 | ||
a74fb73c | 906 | static int run_init_process(const char *init_filename) |
1da177e4 LT |
907 | { |
908 | argv_init[0] = init_filename; | |
c4ad8f98 | 909 | return do_execve(getname_kernel(init_filename), |
ae903caa AV |
910 | (const char __user *const __user *)argv_init, |
911 | (const char __user *const __user *)envp_init); | |
1da177e4 LT |
912 | } |
913 | ||
ba24762b MO |
914 | static int try_to_run_init_process(const char *init_filename) |
915 | { | |
916 | int ret; | |
917 | ||
918 | ret = run_init_process(init_filename); | |
919 | ||
920 | if (ret && ret != -ENOENT) { | |
921 | pr_err("Starting init: %s exists but couldn't execute it (error %d)\n", | |
922 | init_filename, ret); | |
923 | } | |
924 | ||
925 | return ret; | |
926 | } | |
927 | ||
f80b0c90 | 928 | static noinline void __init kernel_init_freeable(void); |
d6b21238 | 929 | |
0f5bf6d0 | 930 | #if defined(CONFIG_STRICT_KERNEL_RWX) || defined(CONFIG_STRICT_MODULE_RWX) |
39290b38 | 931 | bool rodata_enabled __ro_after_init = true; |
d2aa1aca KC |
932 | static int __init set_debug_rodata(char *str) |
933 | { | |
934 | return strtobool(str, &rodata_enabled); | |
935 | } | |
936 | __setup("rodata=", set_debug_rodata); | |
39290b38 | 937 | #endif |
d2aa1aca | 938 | |
0f5bf6d0 | 939 | #ifdef CONFIG_STRICT_KERNEL_RWX |
d2aa1aca KC |
940 | static void mark_readonly(void) |
941 | { | |
2959a5f7 | 942 | if (rodata_enabled) { |
d2aa1aca | 943 | mark_rodata_ro(); |
2959a5f7 JP |
944 | rodata_test(); |
945 | } else | |
d2aa1aca KC |
946 | pr_info("Kernel memory protection disabled.\n"); |
947 | } | |
948 | #else | |
949 | static inline void mark_readonly(void) | |
950 | { | |
951 | pr_warn("This architecture does not have kernel memory protection.\n"); | |
952 | } | |
953 | #endif | |
954 | ||
d6b21238 | 955 | static int __ref kernel_init(void *unused) |
ee5bfa64 | 956 | { |
ba24762b MO |
957 | int ret; |
958 | ||
d6b21238 | 959 | kernel_init_freeable(); |
22a9d645 AV |
960 | /* need to finish all async __init code before freeing the memory */ |
961 | async_synchronize_full(); | |
ee5bfa64 | 962 | free_initmem(); |
d2aa1aca | 963 | mark_readonly(); |
ee5bfa64 VG |
964 | system_state = SYSTEM_RUNNING; |
965 | numa_default_policy(); | |
966 | ||
967dcb8f PM |
967 | rcu_end_inkernel_boot(); |
968 | ||
ee5bfa64 | 969 | if (ramdisk_execute_command) { |
ba24762b MO |
970 | ret = run_init_process(ramdisk_execute_command); |
971 | if (!ret) | |
a74fb73c | 972 | return 0; |
ba24762b MO |
973 | pr_err("Failed to execute %s (error %d)\n", |
974 | ramdisk_execute_command, ret); | |
ee5bfa64 VG |
975 | } |
976 | ||
977 | /* | |
978 | * We try each of these until one succeeds. | |
979 | * | |
980 | * The Bourne shell can be used instead of init if we are | |
981 | * trying to recover a really broken machine. | |
982 | */ | |
983 | if (execute_command) { | |
ba24762b MO |
984 | ret = run_init_process(execute_command); |
985 | if (!ret) | |
a74fb73c | 986 | return 0; |
6ef4536e AL |
987 | panic("Requested init %s failed (error %d).", |
988 | execute_command, ret); | |
ee5bfa64 | 989 | } |
ba24762b MO |
990 | if (!try_to_run_init_process("/sbin/init") || |
991 | !try_to_run_init_process("/etc/init") || | |
992 | !try_to_run_init_process("/bin/init") || | |
993 | !try_to_run_init_process("/bin/sh")) | |
a74fb73c | 994 | return 0; |
ee5bfa64 | 995 | |
ba24762b | 996 | panic("No working init found. Try passing init= option to kernel. " |
8c27ceff | 997 | "See Linux Documentation/admin-guide/init.rst for guidance."); |
ee5bfa64 VG |
998 | } |
999 | ||
f80b0c90 | 1000 | static noinline void __init kernel_init_freeable(void) |
1da177e4 | 1001 | { |
b433c3d4 PZ |
1002 | /* |
1003 | * Wait until kthreadd is all set-up. | |
1004 | */ | |
1005 | wait_for_completion(&kthreadd_done); | |
31a67102 LT |
1006 | |
1007 | /* Now the scheduler is fully set up and can do blocking allocations */ | |
1008 | gfp_allowed_mask = __GFP_BITS_MASK; | |
1009 | ||
58568d2a MX |
1010 | /* |
1011 | * init can allocate pages on any node | |
1012 | */ | |
3c466d46 | 1013 | set_mems_allowed(node_states[N_MEMORY]); |
1da177e4 LT |
1014 | /* |
1015 | * init can run on any cpu. | |
1016 | */ | |
1a2142af | 1017 | set_cpus_allowed_ptr(current, cpu_all_mask); |
1da177e4 | 1018 | |
9ec52099 CLG |
1019 | cad_pid = task_pid(current); |
1020 | ||
ca74a6f8 | 1021 | smp_prepare_cpus(setup_max_cpus); |
1da177e4 | 1022 | |
3347fa09 TH |
1023 | workqueue_init(); |
1024 | ||
597b7305 MH |
1025 | init_mm_internals(); |
1026 | ||
1da177e4 | 1027 | do_pre_smp_initcalls(); |
004417a6 | 1028 | lockup_detector_init(); |
1da177e4 | 1029 | |
1da177e4 LT |
1030 | smp_init(); |
1031 | sched_init_smp(); | |
1032 | ||
0e1cc95b MG |
1033 | page_alloc_init_late(); |
1034 | ||
1da177e4 LT |
1035 | do_basic_setup(); |
1036 | ||
2bd3a997 EB |
1037 | /* Open the /dev/console on the rootfs, this should never fail */ |
1038 | if (sys_open((const char __user *) "/dev/console", O_RDWR, 0) < 0) | |
ea676e84 | 1039 | pr_err("Warning: unable to open an initial console.\n"); |
2bd3a997 EB |
1040 | |
1041 | (void) sys_dup(0); | |
1042 | (void) sys_dup(0); | |
1da177e4 LT |
1043 | /* |
1044 | * check if there is an early userspace init. If yes, let it do all | |
1045 | * the work | |
1046 | */ | |
ffdfc409 OJ |
1047 | |
1048 | if (!ramdisk_execute_command) | |
1049 | ramdisk_execute_command = "/init"; | |
1050 | ||
1051 | if (sys_access((const char __user *) ramdisk_execute_command, 0) != 0) { | |
1052 | ramdisk_execute_command = NULL; | |
1da177e4 | 1053 | prepare_namespace(); |
ffdfc409 | 1054 | } |
1da177e4 LT |
1055 | |
1056 | /* | |
1057 | * Ok, we have completed the initial bootup, and | |
1058 | * we're essentially up and running. Get rid of the | |
1059 | * initmem segments and start the user-mode stuff.. | |
c9cd2ce2 DK |
1060 | * |
1061 | * rootfs is available now, try loading the public keys | |
1062 | * and default modules | |
1da177e4 | 1063 | */ |
bb813f4c | 1064 | |
c9cd2ce2 | 1065 | integrity_load_keys(); |
bb813f4c | 1066 | load_default_modules(); |
1da177e4 | 1067 | } |