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 | |
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 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> |
eefa864b | 54 | #include <linux/page_ext.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> | |
38ff87f7 | 77 | #include <linux/sched_clock.h> |
65f382fd | 78 | #include <linux/context_tracking.h> |
47d06e53 | 79 | #include <linux/random.h> |
7b0b73d7 | 80 | #include <linux/list.h> |
c9cd2ce2 | 81 | #include <linux/integrity.h> |
e149ed2b | 82 | #include <linux/proc_ns.h> |
0ddab1d2 | 83 | #include <linux/io.h> |
39290b38 | 84 | #include <linux/cache.h> |
1da177e4 LT |
85 | |
86 | #include <asm/io.h> | |
87 | #include <asm/bugs.h> | |
88 | #include <asm/setup.h> | |
a940199f | 89 | #include <asm/sections.h> |
37b73c82 | 90 | #include <asm/cacheflush.h> |
1da177e4 | 91 | |
aae5f662 | 92 | static int kernel_init(void *); |
1da177e4 LT |
93 | |
94 | extern void init_IRQ(void); | |
ff691f6e | 95 | extern void fork_init(void); |
1da177e4 | 96 | extern void radix_tree_init(void); |
1da177e4 | 97 | |
2ce802f6 TH |
98 | /* |
99 | * Debug helper: via this flag we know that we are in 'early bootup code' | |
100 | * where only the boot processor is running with IRQ disabled. This means | |
101 | * two things - IRQ must not be enabled before the flag is cleared and some | |
102 | * operations which are not allowed with IRQ disabled are allowed while the | |
103 | * flag is set. | |
104 | */ | |
105 | bool early_boot_irqs_disabled __read_mostly; | |
106 | ||
a6826048 | 107 | enum system_states system_state __read_mostly; |
1da177e4 LT |
108 | EXPORT_SYMBOL(system_state); |
109 | ||
110 | /* | |
111 | * Boot command-line arguments | |
112 | */ | |
113 | #define MAX_INIT_ARGS CONFIG_INIT_ENV_ARG_LIMIT | |
114 | #define MAX_INIT_ENVS CONFIG_INIT_ENV_ARG_LIMIT | |
115 | ||
116 | extern void time_init(void); | |
117 | /* Default late time init is NULL. archs can override this later. */ | |
d2e3192b | 118 | void (*__initdata late_time_init)(void); |
1da177e4 | 119 | |
30d7e0d4 ABL |
120 | /* Untouched command line saved by arch-specific code. */ |
121 | char __initdata boot_command_line[COMMAND_LINE_SIZE]; | |
122 | /* Untouched saved command line (eg. for /proc) */ | |
123 | char *saved_command_line; | |
124 | /* Command line for parameter parsing */ | |
125 | static char *static_command_line; | |
08746a65 KM |
126 | /* Command line for per-initcall parameter parsing */ |
127 | static char *initcall_command_line; | |
1da177e4 LT |
128 | |
129 | static char *execute_command; | |
ffdfc409 | 130 | static char *ramdisk_execute_command; |
1da177e4 | 131 | |
c4b2c0c5 HFS |
132 | /* |
133 | * Used to generate warnings if static_key manipulation functions are used | |
134 | * before jump_label_init is called. | |
135 | */ | |
dd4d9fec | 136 | bool static_key_initialized __read_mostly; |
c4b2c0c5 HFS |
137 | EXPORT_SYMBOL_GPL(static_key_initialized); |
138 | ||
8b3b2955 JB |
139 | /* |
140 | * If set, this is an indication to the drivers that reset the underlying | |
141 | * device before going ahead with the initialization otherwise driver might | |
142 | * rely on the BIOS and skip the reset operation. | |
143 | * | |
144 | * This is useful if kernel is booting in an unreliable environment. | |
fc454fdc | 145 | * For ex. kdump situation where previous kernel has crashed, BIOS has been |
8b3b2955 JB |
146 | * skipped and devices will be in unknown state. |
147 | */ | |
148 | unsigned int reset_devices; | |
149 | EXPORT_SYMBOL(reset_devices); | |
1da177e4 | 150 | |
7e96287d VG |
151 | static int __init set_reset_devices(char *str) |
152 | { | |
153 | reset_devices = 1; | |
154 | return 1; | |
155 | } | |
156 | ||
157 | __setup("reset_devices", set_reset_devices); | |
158 | ||
dd4d9fec FF |
159 | static const char *argv_init[MAX_INIT_ARGS+2] = { "init", NULL, }; |
160 | const char *envp_init[MAX_INIT_ENVS+2] = { "HOME=/", "TERM=linux", NULL, }; | |
1da177e4 LT |
161 | static const char *panic_later, *panic_param; |
162 | ||
914dcaa8 | 163 | extern const struct obs_kernel_param __setup_start[], __setup_end[]; |
1da177e4 | 164 | |
31c025b5 | 165 | static bool __init obsolete_checksetup(char *line) |
1da177e4 | 166 | { |
914dcaa8 | 167 | const struct obs_kernel_param *p; |
31c025b5 | 168 | bool had_early_param = false; |
1da177e4 LT |
169 | |
170 | p = __setup_start; | |
171 | do { | |
172 | int n = strlen(p->str); | |
b1e4d20c | 173 | if (parameqn(line, p->str, n)) { |
1da177e4 | 174 | if (p->early) { |
33df0d19 RR |
175 | /* Already done in parse_early_param? |
176 | * (Needs exact match on param part). | |
177 | * Keep iterating, as we can have early | |
178 | * params and __setups of same names 8( */ | |
1da177e4 | 179 | if (line[n] == '\0' || line[n] == '=') |
31c025b5 | 180 | had_early_param = true; |
1da177e4 | 181 | } else if (!p->setup_func) { |
ea676e84 AM |
182 | pr_warn("Parameter %s is obsolete, ignored\n", |
183 | p->str); | |
31c025b5 | 184 | return true; |
1da177e4 | 185 | } else if (p->setup_func(line + n)) |
31c025b5 | 186 | return true; |
1da177e4 LT |
187 | } |
188 | p++; | |
189 | } while (p < __setup_end); | |
33df0d19 RR |
190 | |
191 | return had_early_param; | |
1da177e4 LT |
192 | } |
193 | ||
194 | /* | |
195 | * This should be approx 2 Bo*oMips to start (note initial shift), and will | |
196 | * still work even if initially too large, it will just take slightly longer | |
197 | */ | |
198 | unsigned long loops_per_jiffy = (1<<12); | |
1da177e4 LT |
199 | EXPORT_SYMBOL(loops_per_jiffy); |
200 | ||
201 | static int __init debug_kernel(char *str) | |
202 | { | |
a8fe19eb | 203 | console_loglevel = CONSOLE_LOGLEVEL_DEBUG; |
f6f21c81 | 204 | return 0; |
1da177e4 LT |
205 | } |
206 | ||
207 | static int __init quiet_kernel(char *str) | |
208 | { | |
a8fe19eb | 209 | console_loglevel = CONSOLE_LOGLEVEL_QUIET; |
f6f21c81 | 210 | return 0; |
1da177e4 LT |
211 | } |
212 | ||
f6f21c81 YL |
213 | early_param("debug", debug_kernel); |
214 | early_param("quiet", quiet_kernel); | |
1da177e4 LT |
215 | |
216 | static int __init loglevel(char *str) | |
217 | { | |
808bf29b AS |
218 | int newlevel; |
219 | ||
220 | /* | |
221 | * Only update loglevel value when a correct setting was passed, | |
222 | * to prevent blind crashes (when loglevel being set to 0) that | |
223 | * are quite hard to debug | |
224 | */ | |
225 | if (get_option(&str, &newlevel)) { | |
226 | console_loglevel = newlevel; | |
227 | return 0; | |
228 | } | |
229 | ||
230 | return -EINVAL; | |
1da177e4 LT |
231 | } |
232 | ||
f6f21c81 | 233 | early_param("loglevel", loglevel); |
1da177e4 | 234 | |
a99cd112 | 235 | /* Change NUL term back to "=", to make "param" the whole string. */ |
ecc86170 LR |
236 | static int __init repair_env_string(char *param, char *val, |
237 | const char *unused, void *arg) | |
1da177e4 | 238 | { |
1da177e4 LT |
239 | if (val) { |
240 | /* param=val or param="val"? */ | |
241 | if (val == param+strlen(param)+1) | |
242 | val[-1] = '='; | |
243 | else if (val == param+strlen(param)+2) { | |
244 | val[-2] = '='; | |
245 | memmove(val-1, val, strlen(val)+1); | |
246 | val--; | |
247 | } else | |
248 | BUG(); | |
249 | } | |
a99cd112 CM |
250 | return 0; |
251 | } | |
252 | ||
51e158c1 | 253 | /* Anything after -- gets handed straight to init. */ |
ecc86170 LR |
254 | static int __init set_init_arg(char *param, char *val, |
255 | const char *unused, void *arg) | |
51e158c1 RR |
256 | { |
257 | unsigned int i; | |
258 | ||
259 | if (panic_later) | |
260 | return 0; | |
261 | ||
ecc86170 | 262 | repair_env_string(param, val, unused, NULL); |
51e158c1 RR |
263 | |
264 | for (i = 0; argv_init[i]; i++) { | |
265 | if (i == MAX_INIT_ARGS) { | |
266 | panic_later = "init"; | |
267 | panic_param = param; | |
268 | return 0; | |
269 | } | |
270 | } | |
271 | argv_init[i] = param; | |
272 | return 0; | |
273 | } | |
274 | ||
a99cd112 CM |
275 | /* |
276 | * Unknown boot options get handed to init, unless they look like | |
277 | * unused parameters (modprobe will find them in /proc/cmdline). | |
278 | */ | |
ecc86170 LR |
279 | static int __init unknown_bootoption(char *param, char *val, |
280 | const char *unused, void *arg) | |
a99cd112 | 281 | { |
ecc86170 | 282 | repair_env_string(param, val, unused, NULL); |
1da177e4 LT |
283 | |
284 | /* Handle obsolete-style parameters */ | |
285 | if (obsolete_checksetup(param)) | |
286 | return 0; | |
287 | ||
f066a4f6 RR |
288 | /* Unused module parameter. */ |
289 | if (strchr(param, '.') && (!val || strchr(param, '.') < val)) | |
1da177e4 | 290 | return 0; |
1da177e4 LT |
291 | |
292 | if (panic_later) | |
293 | return 0; | |
294 | ||
295 | if (val) { | |
296 | /* Environment option */ | |
297 | unsigned int i; | |
298 | for (i = 0; envp_init[i]; i++) { | |
299 | if (i == MAX_INIT_ENVS) { | |
499a4584 | 300 | panic_later = "env"; |
1da177e4 LT |
301 | panic_param = param; |
302 | } | |
303 | if (!strncmp(param, envp_init[i], val - param)) | |
304 | break; | |
305 | } | |
306 | envp_init[i] = param; | |
307 | } else { | |
308 | /* Command line option */ | |
309 | unsigned int i; | |
310 | for (i = 0; argv_init[i]; i++) { | |
311 | if (i == MAX_INIT_ARGS) { | |
499a4584 | 312 | panic_later = "init"; |
1da177e4 LT |
313 | panic_param = param; |
314 | } | |
315 | } | |
316 | argv_init[i] = param; | |
317 | } | |
318 | return 0; | |
319 | } | |
320 | ||
321 | static int __init init_setup(char *str) | |
322 | { | |
323 | unsigned int i; | |
324 | ||
325 | execute_command = str; | |
326 | /* | |
327 | * In case LILO is going to boot us with default command line, | |
328 | * it prepends "auto" before the whole cmdline which makes | |
329 | * the shell think it should execute a script with such name. | |
330 | * So we ignore all arguments entered _before_ init=... [MJ] | |
331 | */ | |
332 | for (i = 1; i < MAX_INIT_ARGS; i++) | |
333 | argv_init[i] = NULL; | |
334 | return 1; | |
335 | } | |
336 | __setup("init=", init_setup); | |
337 | ||
ffdfc409 OJ |
338 | static int __init rdinit_setup(char *str) |
339 | { | |
340 | unsigned int i; | |
341 | ||
342 | ramdisk_execute_command = str; | |
343 | /* See "auto" comment in init_setup */ | |
344 | for (i = 1; i < MAX_INIT_ARGS; i++) | |
345 | argv_init[i] = NULL; | |
346 | return 1; | |
347 | } | |
348 | __setup("rdinit=", rdinit_setup); | |
349 | ||
1da177e4 | 350 | #ifndef CONFIG_SMP |
34db18a0 | 351 | static const unsigned int setup_max_cpus = NR_CPUS; |
e0982e90 | 352 | static inline void setup_nr_cpu_ids(void) { } |
1da177e4 | 353 | static inline void smp_prepare_cpus(unsigned int maxcpus) { } |
1da177e4 LT |
354 | #endif |
355 | ||
30d7e0d4 ABL |
356 | /* |
357 | * We need to store the untouched command line for future reference. | |
358 | * We also need to store the touched command line since the parameter | |
359 | * parsing is performed in place, and we should allow a component to | |
360 | * store reference of name/value for future reference. | |
361 | */ | |
362 | static void __init setup_command_line(char *command_line) | |
363 | { | |
098b081b SS |
364 | saved_command_line = |
365 | memblock_virt_alloc(strlen(boot_command_line) + 1, 0); | |
366 | initcall_command_line = | |
367 | memblock_virt_alloc(strlen(boot_command_line) + 1, 0); | |
368 | static_command_line = memblock_virt_alloc(strlen(command_line) + 1, 0); | |
dd4d9fec FF |
369 | strcpy(saved_command_line, boot_command_line); |
370 | strcpy(static_command_line, command_line); | |
30d7e0d4 ABL |
371 | } |
372 | ||
1da177e4 LT |
373 | /* |
374 | * We need to finalize in a non-__init function or else race conditions | |
375 | * between the root thread and the init thread may cause start_kernel to | |
376 | * be reaped by free_initmem before the root thread has proceeded to | |
377 | * cpu_idle. | |
378 | * | |
379 | * gcc-3.4 accidentally inlines this function, so use noinline. | |
380 | */ | |
381 | ||
b433c3d4 PZ |
382 | static __initdata DECLARE_COMPLETION(kthreadd_done); |
383 | ||
bd721ea7 | 384 | static noinline void __ref rest_init(void) |
1da177e4 | 385 | { |
73c27992 EB |
386 | int pid; |
387 | ||
7db905e6 | 388 | rcu_scheduler_starting(); |
b433c3d4 | 389 | /* |
97158569 | 390 | * We need to spawn init first so that it obtains pid 1, however |
b433c3d4 PZ |
391 | * the init task will end up wanting to create kthreads, which, if |
392 | * we schedule it before we create kthreadd, will OOPS. | |
393 | */ | |
34a1b723 | 394 | kernel_thread(kernel_init, NULL, CLONE_FS); |
1da177e4 | 395 | numa_default_policy(); |
73c27992 | 396 | pid = kernel_thread(kthreadd, NULL, CLONE_FS | CLONE_FILES); |
d11c563d | 397 | rcu_read_lock(); |
5cd20455 | 398 | kthreadd_task = find_task_by_pid_ns(pid, &init_pid_ns); |
d11c563d | 399 | rcu_read_unlock(); |
b433c3d4 | 400 | complete(&kthreadd_done); |
f340c0d1 IM |
401 | |
402 | /* | |
403 | * The boot idle thread must execute schedule() | |
1df21055 | 404 | * at least once to get things moving: |
f340c0d1 | 405 | */ |
1df21055 | 406 | init_idle_bootup_task(current); |
bd2f5536 | 407 | schedule_preempt_disabled(); |
5bfb5d69 | 408 | /* Call into cpu_idle with preempt disabled */ |
a1a04ec3 | 409 | cpu_startup_entry(CPUHP_ONLINE); |
1df21055 | 410 | } |
1da177e4 LT |
411 | |
412 | /* Check for early params. */ | |
ecc86170 LR |
413 | static int __init do_early_param(char *param, char *val, |
414 | const char *unused, void *arg) | |
1da177e4 | 415 | { |
914dcaa8 | 416 | const struct obs_kernel_param *p; |
1da177e4 LT |
417 | |
418 | for (p = __setup_start; p < __setup_end; p++) { | |
b1e4d20c | 419 | if ((p->early && parameq(param, p->str)) || |
18a8bd94 YL |
420 | (strcmp(param, "console") == 0 && |
421 | strcmp(p->str, "earlycon") == 0) | |
422 | ) { | |
1da177e4 | 423 | if (p->setup_func(val) != 0) |
ea676e84 | 424 | pr_warn("Malformed early option '%s'\n", param); |
1da177e4 LT |
425 | } |
426 | } | |
427 | /* We accept everything at this stage. */ | |
428 | return 0; | |
429 | } | |
430 | ||
13977091 MD |
431 | void __init parse_early_options(char *cmdline) |
432 | { | |
ecc86170 LR |
433 | parse_args("early options", cmdline, NULL, 0, 0, 0, NULL, |
434 | do_early_param); | |
13977091 MD |
435 | } |
436 | ||
1da177e4 LT |
437 | /* Arch code calls this early on, or if not, just before other parsing. */ |
438 | void __init parse_early_param(void) | |
439 | { | |
dd4d9fec FF |
440 | static int done __initdata; |
441 | static char tmp_cmdline[COMMAND_LINE_SIZE] __initdata; | |
1da177e4 LT |
442 | |
443 | if (done) | |
444 | return; | |
445 | ||
446 | /* All fall through to do_early_param. */ | |
30d7e0d4 | 447 | strlcpy(tmp_cmdline, boot_command_line, COMMAND_LINE_SIZE); |
13977091 | 448 | parse_early_options(tmp_cmdline); |
1da177e4 LT |
449 | done = 1; |
450 | } | |
451 | ||
e7ff3a47 TG |
452 | void __init __weak arch_post_acpi_subsys_init(void) { } |
453 | ||
839ad62e | 454 | void __init __weak smp_setup_processor_id(void) |
033ab7f8 AM |
455 | { |
456 | } | |
457 | ||
eded09cc | 458 | # if THREAD_SIZE >= PAGE_SIZE |
b235beea | 459 | void __init __weak thread_stack_cache_init(void) |
8c9843e5 BH |
460 | { |
461 | } | |
eded09cc | 462 | #endif |
8c9843e5 | 463 | |
444f478f PE |
464 | /* |
465 | * Set up kernel memory allocators | |
466 | */ | |
467 | static void __init mm_init(void) | |
468 | { | |
eefa864b JK |
469 | /* |
470 | * page_ext requires contiguous pages, | |
471 | * bigger than MAX_ORDER unless SPARSEMEM. | |
472 | */ | |
473 | page_ext_init_flatmem(); | |
444f478f PE |
474 | mem_init(); |
475 | kmem_cache_init(); | |
099a19d9 | 476 | percpu_init_late(); |
b35f1819 | 477 | pgtable_init(); |
444f478f | 478 | vmalloc_init(); |
0ddab1d2 | 479 | ioremap_huge_init(); |
444f478f PE |
480 | } |
481 | ||
722a9f92 | 482 | asmlinkage __visible void __init start_kernel(void) |
1da177e4 | 483 | { |
dd4d9fec FF |
484 | char *command_line; |
485 | char *after_dashes; | |
033ab7f8 | 486 | |
d4311ff1 | 487 | set_task_stack_end_magic(&init_task); |
73839c5b | 488 | smp_setup_processor_id(); |
3ac7fe5a | 489 | debug_objects_early_init(); |
42059429 IM |
490 | |
491 | /* | |
492 | * Set up the the initial canary ASAP: | |
493 | */ | |
494 | boot_init_stack_canary(); | |
495 | ||
ddbcc7e8 | 496 | cgroup_init_early(); |
fbb9ce95 IM |
497 | |
498 | local_irq_disable(); | |
2ce802f6 | 499 | early_boot_irqs_disabled = true; |
fbb9ce95 | 500 | |
1da177e4 LT |
501 | /* |
502 | * Interrupts are still disabled. Do necessary setups, then | |
503 | * enable them | |
504 | */ | |
44fd2299 | 505 | boot_cpu_init(); |
1da177e4 | 506 | page_address_init(); |
ea676e84 | 507 | pr_notice("%s", linux_banner); |
1da177e4 | 508 | setup_arch(&command_line); |
6345d24d | 509 | mm_init_cpumask(&init_mm); |
30d7e0d4 | 510 | setup_command_line(command_line); |
e0982e90 | 511 | setup_nr_cpu_ids(); |
d6647bdf | 512 | setup_per_cpu_areas(); |
cff7d378 | 513 | boot_cpu_state_init(); |
44fd2299 | 514 | smp_prepare_boot_cpu(); /* arch-specific boot-cpu hooks */ |
1da177e4 | 515 | |
9adb62a5 | 516 | build_all_zonelists(NULL, NULL); |
83b519e8 PE |
517 | page_alloc_init(); |
518 | ||
ea676e84 | 519 | pr_notice("Kernel command line: %s\n", boot_command_line); |
83b519e8 | 520 | parse_early_param(); |
51e158c1 RR |
521 | after_dashes = parse_args("Booting kernel", |
522 | static_command_line, __start___param, | |
523 | __stop___param - __start___param, | |
ecc86170 | 524 | -1, -1, NULL, &unknown_bootoption); |
3438cf54 | 525 | if (!IS_ERR_OR_NULL(after_dashes)) |
51e158c1 | 526 | parse_args("Setting init args", after_dashes, NULL, 0, -1, -1, |
ecc86170 | 527 | NULL, set_init_arg); |
97ce2c88 JF |
528 | |
529 | jump_label_init(); | |
530 | ||
83b519e8 PE |
531 | /* |
532 | * These use large bootmem allocations and must precede | |
533 | * kmem_cache_init() | |
534 | */ | |
162a7e75 | 535 | setup_log_buf(0); |
83b519e8 | 536 | pidhash_init(); |
83b519e8 PE |
537 | vfs_caches_init_early(); |
538 | sort_main_extable(); | |
539 | trap_init(); | |
444f478f | 540 | mm_init(); |
de03c72c | 541 | |
1da177e4 LT |
542 | /* |
543 | * Set up the scheduler prior starting any interrupts (such as the | |
544 | * timer interrupt). Full topology setup happens at smp_init() | |
545 | * time - but meanwhile we still have a functioning scheduler. | |
546 | */ | |
547 | sched_init(); | |
548 | /* | |
549 | * Disable preemption - early bootup scheduling is extremely | |
550 | * fragile until we cpu_idle() for the first time. | |
551 | */ | |
552 | preempt_disable(); | |
dd4d9fec FF |
553 | if (WARN(!irqs_disabled(), |
554 | "Interrupts were enabled *very* early, fixing it\n")) | |
c4a68306 | 555 | local_irq_disable(); |
9f58a205 | 556 | idr_init_cache(); |
3347fa09 TH |
557 | |
558 | /* | |
559 | * Allow workqueue creation and work item queueing/cancelling | |
560 | * early. Work item execution depends on kthreads and starts after | |
561 | * workqueue_init(). | |
562 | */ | |
563 | workqueue_init_early(); | |
564 | ||
1da177e4 | 565 | rcu_init(); |
5f893b26 SRRH |
566 | |
567 | /* trace_printk() and trace points may be used after this */ | |
568 | trace_init(); | |
569 | ||
65f382fd | 570 | context_tracking_init(); |
773e3eb7 | 571 | radix_tree_init(); |
0b8f1efa YL |
572 | /* init some links before init_ISA_irqs() */ |
573 | early_irq_init(); | |
1da177e4 | 574 | init_IRQ(); |
ad2b1353 | 575 | tick_init(); |
d6dd50e0 | 576 | rcu_init_nohz(); |
1da177e4 | 577 | init_timers(); |
c0a31329 | 578 | hrtimers_init(); |
1da177e4 | 579 | softirq_init(); |
ad596171 | 580 | timekeeping_init(); |
88fecaa2 | 581 | time_init(); |
38ff87f7 | 582 | sched_clock_postinit(); |
42a0bb3f | 583 | printk_nmi_init(); |
9e630205 | 584 | perf_event_init(); |
93e02814 | 585 | profile_init(); |
d8ad7d11 | 586 | call_function_init(); |
f91eb62f | 587 | WARN(!irqs_disabled(), "Interrupts were enabled early\n"); |
2ce802f6 | 588 | early_boot_irqs_disabled = false; |
93e02814 | 589 | local_irq_enable(); |
dcce284a | 590 | |
7e85ee0c | 591 | kmem_cache_init_late(); |
1da177e4 LT |
592 | |
593 | /* | |
594 | * HACK ALERT! This is early. We're enabling the console before | |
595 | * we've done PCI setups etc, and console_init() must be aware of | |
596 | * this. But we do want output early, in case something goes wrong. | |
597 | */ | |
598 | console_init(); | |
599 | if (panic_later) | |
499a4584 TH |
600 | panic("Too many boot %s vars at `%s'", panic_later, |
601 | panic_param); | |
fbb9ce95 IM |
602 | |
603 | lockdep_info(); | |
604 | ||
9a11b49a IM |
605 | /* |
606 | * Need to run this when irqs are enabled, because it wants | |
607 | * to self-test [hard/soft]-irqs on/off lock inversion bugs | |
608 | * too: | |
609 | */ | |
610 | locking_selftest(); | |
611 | ||
1da177e4 LT |
612 | #ifdef CONFIG_BLK_DEV_INITRD |
613 | if (initrd_start && !initrd_below_start_ok && | |
bd673c7c | 614 | page_to_pfn(virt_to_page((void *)initrd_start)) < min_low_pfn) { |
ea676e84 | 615 | pr_crit("initrd overwritten (0x%08lx < 0x%08lx) - disabling it.\n", |
bd673c7c GU |
616 | page_to_pfn(virt_to_page((void *)initrd_start)), |
617 | min_low_pfn); | |
1da177e4 LT |
618 | initrd_start = 0; |
619 | } | |
620 | #endif | |
fe53ca54 | 621 | page_ext_init(); |
3ac7fe5a | 622 | debug_objects_mem_init(); |
9b090f2d | 623 | kmemleak_init(); |
e7c8d5c9 | 624 | setup_per_cpu_pageset(); |
1da177e4 LT |
625 | numa_policy_init(); |
626 | if (late_time_init) | |
627 | late_time_init(); | |
fa84e9ee | 628 | sched_clock_init(); |
1da177e4 LT |
629 | calibrate_delay(); |
630 | pidmap_init(); | |
1da177e4 | 631 | anon_vma_init(); |
c4e1acbb | 632 | acpi_early_init(); |
11520e5e | 633 | #ifdef CONFIG_X86 |
83e68189 | 634 | if (efi_enabled(EFI_RUNTIME_SERVICES)) |
11520e5e | 635 | efi_enter_virtual_mode(); |
3891a04a | 636 | #endif |
197725de | 637 | #ifdef CONFIG_X86_ESPFIX64 |
3891a04a PA |
638 | /* Should be run before the first non-init thread is created */ |
639 | init_espfix_bsp(); | |
11520e5e | 640 | #endif |
b235beea | 641 | thread_stack_cache_init(); |
d84f4f99 | 642 | cred_init(); |
ff691f6e | 643 | fork_init(); |
1da177e4 LT |
644 | proc_caches_init(); |
645 | buffer_init(); | |
1da177e4 LT |
646 | key_init(); |
647 | security_init(); | |
0b4b3827 | 648 | dbg_late_init(); |
4248b0da | 649 | vfs_caches_init(); |
1da177e4 LT |
650 | signals_init(); |
651 | /* rootfs populating might need page-writeback */ | |
652 | page_writeback_init(); | |
1da177e4 | 653 | proc_root_init(); |
e149ed2b | 654 | nsfs_init(); |
1da177e4 | 655 | cpuset_init(); |
695df213 | 656 | cgroup_init(); |
c757249a | 657 | taskstats_init_early(); |
ca74e92b | 658 | delayacct_init(); |
1da177e4 LT |
659 | |
660 | check_bugs(); | |
661 | ||
b064a8fa | 662 | acpi_subsystem_init(); |
e7ff3a47 | 663 | arch_post_acpi_subsys_init(); |
6ae6996a | 664 | sfi_init_late(); |
1da177e4 | 665 | |
83e68189 | 666 | if (efi_enabled(EFI_RUNTIME_SERVICES)) { |
2223af38 | 667 | efi_late_init(); |
78510792 | 668 | efi_free_boot_services(); |
2223af38 | 669 | } |
78510792 | 670 | |
68bf21aa SR |
671 | ftrace_init(); |
672 | ||
1da177e4 LT |
673 | /* Do the rest non-__init'ed, we're now alive */ |
674 | rest_init(); | |
675 | } | |
676 | ||
b99b87f7 PO |
677 | /* Call all constructor functions linked into the kernel. */ |
678 | static void __init do_ctors(void) | |
679 | { | |
680 | #ifdef CONFIG_CONSTRUCTORS | |
196a15b4 | 681 | ctor_fn_t *fn = (ctor_fn_t *) __ctors_start; |
b99b87f7 | 682 | |
196a15b4 HS |
683 | for (; fn < (ctor_fn_t *) __ctors_end; fn++) |
684 | (*fn)(); | |
b99b87f7 PO |
685 | #endif |
686 | } | |
687 | ||
2329abfa | 688 | bool initcall_debug; |
d0ea3d7d | 689 | core_param(initcall_debug, initcall_debug, bool, 0644); |
1da177e4 | 690 | |
7b0b73d7 PB |
691 | #ifdef CONFIG_KALLSYMS |
692 | struct blacklist_entry { | |
693 | struct list_head next; | |
694 | char *buf; | |
695 | }; | |
696 | ||
697 | static __initdata_or_module LIST_HEAD(blacklisted_initcalls); | |
698 | ||
699 | static int __init initcall_blacklist(char *str) | |
700 | { | |
701 | char *str_entry; | |
702 | struct blacklist_entry *entry; | |
703 | ||
704 | /* str argument is a comma-separated list of functions */ | |
705 | do { | |
706 | str_entry = strsep(&str, ","); | |
707 | if (str_entry) { | |
708 | pr_debug("blacklisting initcall %s\n", str_entry); | |
709 | entry = alloc_bootmem(sizeof(*entry)); | |
710 | entry->buf = alloc_bootmem(strlen(str_entry) + 1); | |
711 | strcpy(entry->buf, str_entry); | |
712 | list_add(&entry->next, &blacklisted_initcalls); | |
713 | } | |
714 | } while (str_entry); | |
715 | ||
716 | return 0; | |
717 | } | |
718 | ||
719 | static bool __init_or_module initcall_blacklisted(initcall_t fn) | |
720 | { | |
7b0b73d7 | 721 | struct blacklist_entry *entry; |
c8cdd2be | 722 | char fn_name[KSYM_SYMBOL_LEN]; |
0fd5ed8d | 723 | unsigned long addr; |
7b0b73d7 | 724 | |
c8cdd2be | 725 | if (list_empty(&blacklisted_initcalls)) |
7b0b73d7 PB |
726 | return false; |
727 | ||
0fd5ed8d RV |
728 | addr = (unsigned long) dereference_function_descriptor(fn); |
729 | sprint_symbol_no_offset(fn_name, addr); | |
c8cdd2be | 730 | |
841c06d7 PB |
731 | /* |
732 | * fn will be "function_name [module_name]" where [module_name] is not | |
733 | * displayed for built-in init functions. Strip off the [module_name]. | |
734 | */ | |
735 | strreplace(fn_name, ' ', '\0'); | |
736 | ||
e6fd1fb3 | 737 | list_for_each_entry(entry, &blacklisted_initcalls, next) { |
7b0b73d7 PB |
738 | if (!strcmp(fn_name, entry->buf)) { |
739 | pr_debug("initcall %s blacklisted\n", fn_name); | |
7b0b73d7 PB |
740 | return true; |
741 | } | |
742 | } | |
743 | ||
7b0b73d7 PB |
744 | return false; |
745 | } | |
746 | #else | |
747 | static int __init initcall_blacklist(char *str) | |
748 | { | |
749 | pr_warn("initcall_blacklist requires CONFIG_KALLSYMS\n"); | |
750 | return 0; | |
751 | } | |
752 | ||
753 | static bool __init_or_module initcall_blacklisted(initcall_t fn) | |
754 | { | |
755 | return false; | |
756 | } | |
757 | #endif | |
758 | __setup("initcall_blacklist=", initcall_blacklist); | |
759 | ||
e4461271 | 760 | static int __init_or_module do_one_initcall_debug(initcall_t fn) |
1da177e4 | 761 | { |
74239072 | 762 | ktime_t calltime, delta, rettime; |
30dbb20e AW |
763 | unsigned long long duration; |
764 | int ret; | |
1da177e4 | 765 | |
d62cf815 | 766 | printk(KERN_DEBUG "calling %pF @ %i\n", fn, task_pid_nr(current)); |
22c5c03b | 767 | calltime = ktime_get(); |
30dbb20e | 768 | ret = fn(); |
22c5c03b KW |
769 | rettime = ktime_get(); |
770 | delta = ktime_sub(rettime, calltime); | |
771 | duration = (unsigned long long) ktime_to_ns(delta) >> 10; | |
d62cf815 | 772 | printk(KERN_DEBUG "initcall %pF returned %d after %lld usecs\n", |
ea676e84 | 773 | fn, ret, duration); |
1da177e4 | 774 | |
22c5c03b KW |
775 | return ret; |
776 | } | |
777 | ||
e4461271 | 778 | int __init_or_module do_one_initcall(initcall_t fn) |
22c5c03b KW |
779 | { |
780 | int count = preempt_count(); | |
781 | int ret; | |
ff1c8fac | 782 | char msgbuf[64]; |
22c5c03b | 783 | |
7b0b73d7 PB |
784 | if (initcall_blacklisted(fn)) |
785 | return -EPERM; | |
786 | ||
22c5c03b KW |
787 | if (initcall_debug) |
788 | ret = do_one_initcall_debug(fn); | |
789 | else | |
790 | ret = fn(); | |
8f0c45cd | 791 | |
e0df154f | 792 | msgbuf[0] = 0; |
e662e1cf | 793 | |
e0df154f | 794 | if (preempt_count() != count) { |
bf5d770b | 795 | sprintf(msgbuf, "preemption imbalance "); |
4a2b4b22 | 796 | preempt_count_set(count); |
1da177e4 | 797 | } |
e0df154f | 798 | if (irqs_disabled()) { |
a76bfd0d | 799 | strlcat(msgbuf, "disabled interrupts ", sizeof(msgbuf)); |
e0df154f LT |
800 | local_irq_enable(); |
801 | } | |
f91eb62f | 802 | WARN(msgbuf[0], "initcall %pF returned with %s\n", fn, msgbuf); |
59f9415f | 803 | |
38addce8 | 804 | add_latent_entropy(); |
30dbb20e | 805 | return ret; |
e0df154f LT |
806 | } |
807 | ||
808 | ||
026cee00 PM |
809 | extern initcall_t __initcall_start[]; |
810 | extern initcall_t __initcall0_start[]; | |
811 | extern initcall_t __initcall1_start[]; | |
812 | extern initcall_t __initcall2_start[]; | |
813 | extern initcall_t __initcall3_start[]; | |
814 | extern initcall_t __initcall4_start[]; | |
815 | extern initcall_t __initcall5_start[]; | |
816 | extern initcall_t __initcall6_start[]; | |
817 | extern initcall_t __initcall7_start[]; | |
818 | extern initcall_t __initcall_end[]; | |
819 | ||
820 | static initcall_t *initcall_levels[] __initdata = { | |
821 | __initcall0_start, | |
822 | __initcall1_start, | |
823 | __initcall2_start, | |
824 | __initcall3_start, | |
825 | __initcall4_start, | |
826 | __initcall5_start, | |
827 | __initcall6_start, | |
828 | __initcall7_start, | |
829 | __initcall_end, | |
830 | }; | |
831 | ||
96263d28 | 832 | /* Keep these in sync with initcalls in include/linux/init.h */ |
026cee00 | 833 | static char *initcall_level_names[] __initdata = { |
9fb48c74 JC |
834 | "early", |
835 | "core", | |
836 | "postcore", | |
837 | "arch", | |
838 | "subsys", | |
839 | "fs", | |
840 | "device", | |
841 | "late", | |
026cee00 PM |
842 | }; |
843 | ||
026cee00 | 844 | static void __init do_initcall_level(int level) |
e0df154f | 845 | { |
196a15b4 | 846 | initcall_t *fn; |
e0df154f | 847 | |
08746a65 | 848 | strcpy(initcall_command_line, saved_command_line); |
026cee00 | 849 | parse_args(initcall_level_names[level], |
08746a65 | 850 | initcall_command_line, __start___param, |
026cee00 PM |
851 | __stop___param - __start___param, |
852 | level, level, | |
ecc86170 | 853 | NULL, &repair_env_string); |
026cee00 PM |
854 | |
855 | for (fn = initcall_levels[level]; fn < initcall_levels[level+1]; fn++) | |
196a15b4 | 856 | do_one_initcall(*fn); |
1da177e4 LT |
857 | } |
858 | ||
026cee00 PM |
859 | static void __init do_initcalls(void) |
860 | { | |
861 | int level; | |
862 | ||
19efb72f | 863 | for (level = 0; level < ARRAY_SIZE(initcall_levels) - 1; level++) |
026cee00 PM |
864 | do_initcall_level(level); |
865 | } | |
866 | ||
1da177e4 LT |
867 | /* |
868 | * Ok, the machine is now initialized. None of the devices | |
869 | * have been touched yet, but the CPU subsystem is up and | |
870 | * running, and memory and process management works. | |
871 | * | |
872 | * Now we can finally start doing some real work.. | |
873 | */ | |
874 | static void __init do_basic_setup(void) | |
875 | { | |
759ee091 | 876 | cpuset_init_smp(); |
41ffe5d5 | 877 | shmem_init(); |
1da177e4 | 878 | driver_init(); |
b04c3afb | 879 | init_irq_proc(); |
b99b87f7 | 880 | do_ctors(); |
d5767c53 | 881 | usermodehelper_enable(); |
b0f84374 | 882 | do_initcalls(); |
47d06e53 | 883 | random_int_secret_init(); |
1da177e4 LT |
884 | } |
885 | ||
7babe8db | 886 | static void __init do_pre_smp_initcalls(void) |
c2147a50 | 887 | { |
196a15b4 | 888 | initcall_t *fn; |
c2147a50 | 889 | |
026cee00 | 890 | for (fn = __initcall_start; fn < __initcall0_start; fn++) |
196a15b4 | 891 | do_one_initcall(*fn); |
c2147a50 EGM |
892 | } |
893 | ||
bb813f4c TH |
894 | /* |
895 | * This function requests modules which should be loaded by default and is | |
896 | * called twice right after initrd is mounted and right before init is | |
897 | * exec'd. If such modules are on either initrd or rootfs, they will be | |
898 | * loaded before control is passed to userland. | |
899 | */ | |
900 | void __init load_default_modules(void) | |
901 | { | |
902 | load_default_elevator_module(); | |
903 | } | |
904 | ||
a74fb73c | 905 | static int run_init_process(const char *init_filename) |
1da177e4 LT |
906 | { |
907 | argv_init[0] = init_filename; | |
c4ad8f98 | 908 | return do_execve(getname_kernel(init_filename), |
ae903caa AV |
909 | (const char __user *const __user *)argv_init, |
910 | (const char __user *const __user *)envp_init); | |
1da177e4 LT |
911 | } |
912 | ||
ba24762b MO |
913 | static int try_to_run_init_process(const char *init_filename) |
914 | { | |
915 | int ret; | |
916 | ||
917 | ret = run_init_process(init_filename); | |
918 | ||
919 | if (ret && ret != -ENOENT) { | |
920 | pr_err("Starting init: %s exists but couldn't execute it (error %d)\n", | |
921 | init_filename, ret); | |
922 | } | |
923 | ||
924 | return ret; | |
925 | } | |
926 | ||
f80b0c90 | 927 | static noinline void __init kernel_init_freeable(void); |
d6b21238 | 928 | |
4d217a5a | 929 | #if defined(CONFIG_DEBUG_RODATA) || defined(CONFIG_DEBUG_SET_MODULE_RONX) |
39290b38 | 930 | bool rodata_enabled __ro_after_init = true; |
d2aa1aca KC |
931 | static int __init set_debug_rodata(char *str) |
932 | { | |
933 | return strtobool(str, &rodata_enabled); | |
934 | } | |
935 | __setup("rodata=", set_debug_rodata); | |
39290b38 | 936 | #endif |
d2aa1aca | 937 | |
39290b38 | 938 | #ifdef CONFIG_DEBUG_RODATA |
d2aa1aca KC |
939 | static void mark_readonly(void) |
940 | { | |
941 | if (rodata_enabled) | |
942 | mark_rodata_ro(); | |
943 | else | |
944 | pr_info("Kernel memory protection disabled.\n"); | |
945 | } | |
946 | #else | |
947 | static inline void mark_readonly(void) | |
948 | { | |
949 | pr_warn("This architecture does not have kernel memory protection.\n"); | |
950 | } | |
951 | #endif | |
952 | ||
d6b21238 | 953 | static int __ref kernel_init(void *unused) |
ee5bfa64 | 954 | { |
ba24762b MO |
955 | int ret; |
956 | ||
d6b21238 | 957 | kernel_init_freeable(); |
22a9d645 AV |
958 | /* need to finish all async __init code before freeing the memory */ |
959 | async_synchronize_full(); | |
ee5bfa64 | 960 | free_initmem(); |
d2aa1aca | 961 | mark_readonly(); |
ee5bfa64 VG |
962 | system_state = SYSTEM_RUNNING; |
963 | numa_default_policy(); | |
964 | ||
4a9d4b02 | 965 | flush_delayed_fput(); |
fae5fa44 | 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 | ||
1da177e4 | 1025 | do_pre_smp_initcalls(); |
004417a6 | 1026 | lockup_detector_init(); |
1da177e4 | 1027 | |
1da177e4 LT |
1028 | smp_init(); |
1029 | sched_init_smp(); | |
1030 | ||
0e1cc95b MG |
1031 | page_alloc_init_late(); |
1032 | ||
1da177e4 LT |
1033 | do_basic_setup(); |
1034 | ||
2bd3a997 EB |
1035 | /* Open the /dev/console on the rootfs, this should never fail */ |
1036 | if (sys_open((const char __user *) "/dev/console", O_RDWR, 0) < 0) | |
ea676e84 | 1037 | pr_err("Warning: unable to open an initial console.\n"); |
2bd3a997 EB |
1038 | |
1039 | (void) sys_dup(0); | |
1040 | (void) sys_dup(0); | |
1da177e4 LT |
1041 | /* |
1042 | * check if there is an early userspace init. If yes, let it do all | |
1043 | * the work | |
1044 | */ | |
ffdfc409 OJ |
1045 | |
1046 | if (!ramdisk_execute_command) | |
1047 | ramdisk_execute_command = "/init"; | |
1048 | ||
1049 | if (sys_access((const char __user *) ramdisk_execute_command, 0) != 0) { | |
1050 | ramdisk_execute_command = NULL; | |
1da177e4 | 1051 | prepare_namespace(); |
ffdfc409 | 1052 | } |
1da177e4 LT |
1053 | |
1054 | /* | |
1055 | * Ok, we have completed the initial bootup, and | |
1056 | * we're essentially up and running. Get rid of the | |
1057 | * initmem segments and start the user-mode stuff.. | |
c9cd2ce2 DK |
1058 | * |
1059 | * rootfs is available now, try loading the public keys | |
1060 | * and default modules | |
1da177e4 | 1061 | */ |
bb813f4c | 1062 | |
c9cd2ce2 | 1063 | integrity_load_keys(); |
bb813f4c | 1064 | load_default_modules(); |
1da177e4 | 1065 | } |