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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> | |
1da177e4 LT |
18 | #include <linux/kernel.h> |
19 | #include <linux/syscalls.h> | |
9b5609fd | 20 | #include <linux/stackprotector.h> |
1da177e4 LT |
21 | #include <linux/string.h> |
22 | #include <linux/ctype.h> | |
23 | #include <linux/delay.h> | |
1da177e4 LT |
24 | #include <linux/ioport.h> |
25 | #include <linux/init.h> | |
1da177e4 | 26 | #include <linux/initrd.h> |
1da177e4 | 27 | #include <linux/bootmem.h> |
4a7a16dc | 28 | #include <linux/acpi.h> |
1da177e4 | 29 | #include <linux/tty.h> |
1da177e4 LT |
30 | #include <linux/percpu.h> |
31 | #include <linux/kmod.h> | |
db64fe02 | 32 | #include <linux/vmalloc.h> |
1da177e4 | 33 | #include <linux/kernel_stat.h> |
d7cd5611 | 34 | #include <linux/start_kernel.h> |
1da177e4 | 35 | #include <linux/security.h> |
3d442233 | 36 | #include <linux/smp.h> |
1da177e4 LT |
37 | #include <linux/profile.h> |
38 | #include <linux/rcupdate.h> | |
39 | #include <linux/moduleparam.h> | |
40 | #include <linux/kallsyms.h> | |
41 | #include <linux/writeback.h> | |
42 | #include <linux/cpu.h> | |
43 | #include <linux/cpuset.h> | |
ddbcc7e8 | 44 | #include <linux/cgroup.h> |
1da177e4 | 45 | #include <linux/efi.h> |
906568c9 | 46 | #include <linux/tick.h> |
6168a702 | 47 | #include <linux/interrupt.h> |
c757249a | 48 | #include <linux/taskstats_kern.h> |
ca74e92b | 49 | #include <linux/delayacct.h> |
1da177e4 LT |
50 | #include <linux/unistd.h> |
51 | #include <linux/rmap.h> | |
52 | #include <linux/mempolicy.h> | |
53 | #include <linux/key.h> | |
b6cd0b77 | 54 | #include <linux/buffer_head.h> |
eefa864b | 55 | #include <linux/page_ext.h> |
9a11b49a | 56 | #include <linux/debug_locks.h> |
3ac7fe5a | 57 | #include <linux/debugobjects.h> |
fbb9ce95 | 58 | #include <linux/lockdep.h> |
3c7b4e6b | 59 | #include <linux/kmemleak.h> |
84d73786 | 60 | #include <linux/pid_namespace.h> |
1f21782e | 61 | #include <linux/device.h> |
73c27992 | 62 | #include <linux/kthread.h> |
e6fe6649 | 63 | #include <linux/sched.h> |
a1c9eea9 | 64 | #include <linux/signal.h> |
199f0ca5 | 65 | #include <linux/idr.h> |
0b4b3827 | 66 | #include <linux/kgdb.h> |
68bf21aa | 67 | #include <linux/ftrace.h> |
22a9d645 | 68 | #include <linux/async.h> |
dfec072e | 69 | #include <linux/kmemcheck.h> |
6ae6996a | 70 | #include <linux/sfi.h> |
2b2af54a | 71 | #include <linux/shmem_fs.h> |
5a0e3ad6 | 72 | #include <linux/slab.h> |
24a24bb6 | 73 | #include <linux/perf_event.h> |
4a9d4b02 | 74 | #include <linux/file.h> |
a74fb73c | 75 | #include <linux/ptrace.h> |
bb813f4c TH |
76 | #include <linux/blkdev.h> |
77 | #include <linux/elevator.h> | |
38ff87f7 | 78 | #include <linux/sched_clock.h> |
65f382fd | 79 | #include <linux/context_tracking.h> |
47d06e53 | 80 | #include <linux/random.h> |
7b0b73d7 | 81 | #include <linux/list.h> |
c9cd2ce2 | 82 | #include <linux/integrity.h> |
e149ed2b | 83 | #include <linux/proc_ns.h> |
0ddab1d2 | 84 | #include <linux/io.h> |
39290b38 | 85 | #include <linux/cache.h> |
1da177e4 LT |
86 | |
87 | #include <asm/io.h> | |
88 | #include <asm/bugs.h> | |
89 | #include <asm/setup.h> | |
a940199f | 90 | #include <asm/sections.h> |
37b73c82 | 91 | #include <asm/cacheflush.h> |
1da177e4 | 92 | |
aae5f662 | 93 | static int kernel_init(void *); |
1da177e4 LT |
94 | |
95 | extern void init_IRQ(void); | |
ff691f6e | 96 | extern void fork_init(void); |
1da177e4 | 97 | extern void radix_tree_init(void); |
1da177e4 | 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 | 120 | |
30d7e0d4 ABL |
121 | /* Untouched command line saved by arch-specific code. */ |
122 | char __initdata boot_command_line[COMMAND_LINE_SIZE]; | |
123 | /* Untouched saved command line (eg. for /proc) */ | |
124 | char *saved_command_line; | |
125 | /* Command line for parameter parsing */ | |
126 | static char *static_command_line; | |
08746a65 KM |
127 | /* Command line for per-initcall parameter parsing */ |
128 | static char *initcall_command_line; | |
1da177e4 LT |
129 | |
130 | static char *execute_command; | |
ffdfc409 | 131 | static char *ramdisk_execute_command; |
1da177e4 | 132 | |
c4b2c0c5 HFS |
133 | /* |
134 | * Used to generate warnings if static_key manipulation functions are used | |
135 | * before jump_label_init is called. | |
136 | */ | |
dd4d9fec | 137 | bool static_key_initialized __read_mostly; |
c4b2c0c5 HFS |
138 | EXPORT_SYMBOL_GPL(static_key_initialized); |
139 | ||
8b3b2955 JB |
140 | /* |
141 | * If set, this is an indication to the drivers that reset the underlying | |
142 | * device before going ahead with the initialization otherwise driver might | |
143 | * rely on the BIOS and skip the reset operation. | |
144 | * | |
145 | * This is useful if kernel is booting in an unreliable environment. | |
fc454fdc | 146 | * For ex. kdump situation where previous kernel has crashed, BIOS has been |
8b3b2955 JB |
147 | * skipped and devices will be in unknown state. |
148 | */ | |
149 | unsigned int reset_devices; | |
150 | EXPORT_SYMBOL(reset_devices); | |
1da177e4 | 151 | |
7e96287d VG |
152 | static int __init set_reset_devices(char *str) |
153 | { | |
154 | reset_devices = 1; | |
155 | return 1; | |
156 | } | |
157 | ||
158 | __setup("reset_devices", set_reset_devices); | |
159 | ||
dd4d9fec FF |
160 | static const char *argv_init[MAX_INIT_ARGS+2] = { "init", NULL, }; |
161 | const char *envp_init[MAX_INIT_ENVS+2] = { "HOME=/", "TERM=linux", NULL, }; | |
1da177e4 LT |
162 | static const char *panic_later, *panic_param; |
163 | ||
914dcaa8 | 164 | extern const struct obs_kernel_param __setup_start[], __setup_end[]; |
1da177e4 | 165 | |
31c025b5 | 166 | static bool __init obsolete_checksetup(char *line) |
1da177e4 | 167 | { |
914dcaa8 | 168 | const struct obs_kernel_param *p; |
31c025b5 | 169 | bool had_early_param = false; |
1da177e4 LT |
170 | |
171 | p = __setup_start; | |
172 | do { | |
173 | int n = strlen(p->str); | |
b1e4d20c | 174 | if (parameqn(line, p->str, n)) { |
1da177e4 | 175 | if (p->early) { |
33df0d19 RR |
176 | /* Already done in parse_early_param? |
177 | * (Needs exact match on param part). | |
178 | * Keep iterating, as we can have early | |
179 | * params and __setups of same names 8( */ | |
1da177e4 | 180 | if (line[n] == '\0' || line[n] == '=') |
31c025b5 | 181 | had_early_param = true; |
1da177e4 | 182 | } else if (!p->setup_func) { |
ea676e84 AM |
183 | pr_warn("Parameter %s is obsolete, ignored\n", |
184 | p->str); | |
31c025b5 | 185 | return true; |
1da177e4 | 186 | } else if (p->setup_func(line + n)) |
31c025b5 | 187 | return true; |
1da177e4 LT |
188 | } |
189 | p++; | |
190 | } while (p < __setup_end); | |
33df0d19 RR |
191 | |
192 | return had_early_param; | |
1da177e4 LT |
193 | } |
194 | ||
195 | /* | |
196 | * This should be approx 2 Bo*oMips to start (note initial shift), and will | |
197 | * still work even if initially too large, it will just take slightly longer | |
198 | */ | |
199 | unsigned long loops_per_jiffy = (1<<12); | |
1da177e4 LT |
200 | EXPORT_SYMBOL(loops_per_jiffy); |
201 | ||
202 | static int __init debug_kernel(char *str) | |
203 | { | |
a8fe19eb | 204 | console_loglevel = CONSOLE_LOGLEVEL_DEBUG; |
f6f21c81 | 205 | return 0; |
1da177e4 LT |
206 | } |
207 | ||
208 | static int __init quiet_kernel(char *str) | |
209 | { | |
a8fe19eb | 210 | console_loglevel = CONSOLE_LOGLEVEL_QUIET; |
f6f21c81 | 211 | return 0; |
1da177e4 LT |
212 | } |
213 | ||
f6f21c81 YL |
214 | early_param("debug", debug_kernel); |
215 | early_param("quiet", quiet_kernel); | |
1da177e4 LT |
216 | |
217 | static int __init loglevel(char *str) | |
218 | { | |
808bf29b AS |
219 | int newlevel; |
220 | ||
221 | /* | |
222 | * Only update loglevel value when a correct setting was passed, | |
223 | * to prevent blind crashes (when loglevel being set to 0) that | |
224 | * are quite hard to debug | |
225 | */ | |
226 | if (get_option(&str, &newlevel)) { | |
227 | console_loglevel = newlevel; | |
228 | return 0; | |
229 | } | |
230 | ||
231 | return -EINVAL; | |
1da177e4 LT |
232 | } |
233 | ||
f6f21c81 | 234 | early_param("loglevel", loglevel); |
1da177e4 | 235 | |
a99cd112 | 236 | /* Change NUL term back to "=", to make "param" the whole string. */ |
ecc86170 LR |
237 | static int __init repair_env_string(char *param, char *val, |
238 | const char *unused, void *arg) | |
1da177e4 | 239 | { |
1da177e4 LT |
240 | if (val) { |
241 | /* param=val or param="val"? */ | |
242 | if (val == param+strlen(param)+1) | |
243 | val[-1] = '='; | |
244 | else if (val == param+strlen(param)+2) { | |
245 | val[-2] = '='; | |
246 | memmove(val-1, val, strlen(val)+1); | |
247 | val--; | |
248 | } else | |
249 | BUG(); | |
250 | } | |
a99cd112 CM |
251 | return 0; |
252 | } | |
253 | ||
51e158c1 | 254 | /* Anything after -- gets handed straight to init. */ |
ecc86170 LR |
255 | static int __init set_init_arg(char *param, char *val, |
256 | const char *unused, void *arg) | |
51e158c1 RR |
257 | { |
258 | unsigned int i; | |
259 | ||
260 | if (panic_later) | |
261 | return 0; | |
262 | ||
ecc86170 | 263 | repair_env_string(param, val, unused, NULL); |
51e158c1 RR |
264 | |
265 | for (i = 0; argv_init[i]; i++) { | |
266 | if (i == MAX_INIT_ARGS) { | |
267 | panic_later = "init"; | |
268 | panic_param = param; | |
269 | return 0; | |
270 | } | |
271 | } | |
272 | argv_init[i] = param; | |
273 | return 0; | |
274 | } | |
275 | ||
a99cd112 CM |
276 | /* |
277 | * Unknown boot options get handed to init, unless they look like | |
278 | * unused parameters (modprobe will find them in /proc/cmdline). | |
279 | */ | |
ecc86170 LR |
280 | static int __init unknown_bootoption(char *param, char *val, |
281 | const char *unused, void *arg) | |
a99cd112 | 282 | { |
ecc86170 | 283 | repair_env_string(param, val, unused, NULL); |
1da177e4 LT |
284 | |
285 | /* Handle obsolete-style parameters */ | |
286 | if (obsolete_checksetup(param)) | |
287 | return 0; | |
288 | ||
f066a4f6 RR |
289 | /* Unused module parameter. */ |
290 | if (strchr(param, '.') && (!val || strchr(param, '.') < val)) | |
1da177e4 | 291 | return 0; |
1da177e4 LT |
292 | |
293 | if (panic_later) | |
294 | return 0; | |
295 | ||
296 | if (val) { | |
297 | /* Environment option */ | |
298 | unsigned int i; | |
299 | for (i = 0; envp_init[i]; i++) { | |
300 | if (i == MAX_INIT_ENVS) { | |
499a4584 | 301 | panic_later = "env"; |
1da177e4 LT |
302 | panic_param = param; |
303 | } | |
304 | if (!strncmp(param, envp_init[i], val - param)) | |
305 | break; | |
306 | } | |
307 | envp_init[i] = param; | |
308 | } else { | |
309 | /* Command line option */ | |
310 | unsigned int i; | |
311 | for (i = 0; argv_init[i]; i++) { | |
312 | if (i == MAX_INIT_ARGS) { | |
499a4584 | 313 | panic_later = "init"; |
1da177e4 LT |
314 | panic_param = param; |
315 | } | |
316 | } | |
317 | argv_init[i] = param; | |
318 | } | |
319 | return 0; | |
320 | } | |
321 | ||
322 | static int __init init_setup(char *str) | |
323 | { | |
324 | unsigned int i; | |
325 | ||
326 | execute_command = str; | |
327 | /* | |
328 | * In case LILO is going to boot us with default command line, | |
329 | * it prepends "auto" before the whole cmdline which makes | |
330 | * the shell think it should execute a script with such name. | |
331 | * So we ignore all arguments entered _before_ init=... [MJ] | |
332 | */ | |
333 | for (i = 1; i < MAX_INIT_ARGS; i++) | |
334 | argv_init[i] = NULL; | |
335 | return 1; | |
336 | } | |
337 | __setup("init=", init_setup); | |
338 | ||
ffdfc409 OJ |
339 | static int __init rdinit_setup(char *str) |
340 | { | |
341 | unsigned int i; | |
342 | ||
343 | ramdisk_execute_command = str; | |
344 | /* See "auto" comment in init_setup */ | |
345 | for (i = 1; i < MAX_INIT_ARGS; i++) | |
346 | argv_init[i] = NULL; | |
347 | return 1; | |
348 | } | |
349 | __setup("rdinit=", rdinit_setup); | |
350 | ||
1da177e4 | 351 | #ifndef CONFIG_SMP |
34db18a0 | 352 | static const unsigned int setup_max_cpus = NR_CPUS; |
e0982e90 | 353 | static inline void setup_nr_cpu_ids(void) { } |
1da177e4 | 354 | static inline void smp_prepare_cpus(unsigned int maxcpus) { } |
1da177e4 LT |
355 | #endif |
356 | ||
30d7e0d4 ABL |
357 | /* |
358 | * We need to store the untouched command line for future reference. | |
359 | * We also need to store the touched command line since the parameter | |
360 | * parsing is performed in place, and we should allow a component to | |
361 | * store reference of name/value for future reference. | |
362 | */ | |
363 | static void __init setup_command_line(char *command_line) | |
364 | { | |
098b081b SS |
365 | saved_command_line = |
366 | memblock_virt_alloc(strlen(boot_command_line) + 1, 0); | |
367 | initcall_command_line = | |
368 | memblock_virt_alloc(strlen(boot_command_line) + 1, 0); | |
369 | static_command_line = memblock_virt_alloc(strlen(command_line) + 1, 0); | |
dd4d9fec FF |
370 | strcpy(saved_command_line, boot_command_line); |
371 | strcpy(static_command_line, command_line); | |
30d7e0d4 ABL |
372 | } |
373 | ||
1da177e4 LT |
374 | /* |
375 | * We need to finalize in a non-__init function or else race conditions | |
376 | * between the root thread and the init thread may cause start_kernel to | |
377 | * be reaped by free_initmem before the root thread has proceeded to | |
378 | * cpu_idle. | |
379 | * | |
380 | * gcc-3.4 accidentally inlines this function, so use noinline. | |
381 | */ | |
382 | ||
b433c3d4 PZ |
383 | static __initdata DECLARE_COMPLETION(kthreadd_done); |
384 | ||
bd721ea7 | 385 | static noinline void __ref rest_init(void) |
1da177e4 | 386 | { |
73c27992 EB |
387 | int pid; |
388 | ||
7db905e6 | 389 | rcu_scheduler_starting(); |
b433c3d4 | 390 | /* |
97158569 | 391 | * We need to spawn init first so that it obtains pid 1, however |
b433c3d4 PZ |
392 | * the init task will end up wanting to create kthreads, which, if |
393 | * we schedule it before we create kthreadd, will OOPS. | |
394 | */ | |
34a1b723 | 395 | kernel_thread(kernel_init, NULL, CLONE_FS); |
1da177e4 | 396 | numa_default_policy(); |
73c27992 | 397 | pid = kernel_thread(kthreadd, NULL, CLONE_FS | CLONE_FILES); |
d11c563d | 398 | rcu_read_lock(); |
5cd20455 | 399 | kthreadd_task = find_task_by_pid_ns(pid, &init_pid_ns); |
d11c563d | 400 | rcu_read_unlock(); |
b433c3d4 | 401 | complete(&kthreadd_done); |
f340c0d1 IM |
402 | |
403 | /* | |
404 | * The boot idle thread must execute schedule() | |
1df21055 | 405 | * at least once to get things moving: |
f340c0d1 | 406 | */ |
1df21055 | 407 | init_idle_bootup_task(current); |
bd2f5536 | 408 | schedule_preempt_disabled(); |
5bfb5d69 | 409 | /* Call into cpu_idle with preempt disabled */ |
a1a04ec3 | 410 | cpu_startup_entry(CPUHP_ONLINE); |
1df21055 | 411 | } |
1da177e4 LT |
412 | |
413 | /* Check for early params. */ | |
ecc86170 LR |
414 | static int __init do_early_param(char *param, char *val, |
415 | const char *unused, void *arg) | |
1da177e4 | 416 | { |
914dcaa8 | 417 | const struct obs_kernel_param *p; |
1da177e4 LT |
418 | |
419 | for (p = __setup_start; p < __setup_end; p++) { | |
b1e4d20c | 420 | if ((p->early && parameq(param, p->str)) || |
18a8bd94 YL |
421 | (strcmp(param, "console") == 0 && |
422 | strcmp(p->str, "earlycon") == 0) | |
423 | ) { | |
1da177e4 | 424 | if (p->setup_func(val) != 0) |
ea676e84 | 425 | pr_warn("Malformed early option '%s'\n", param); |
1da177e4 LT |
426 | } |
427 | } | |
428 | /* We accept everything at this stage. */ | |
429 | return 0; | |
430 | } | |
431 | ||
13977091 MD |
432 | void __init parse_early_options(char *cmdline) |
433 | { | |
ecc86170 LR |
434 | parse_args("early options", cmdline, NULL, 0, 0, 0, NULL, |
435 | do_early_param); | |
13977091 MD |
436 | } |
437 | ||
1da177e4 LT |
438 | /* Arch code calls this early on, or if not, just before other parsing. */ |
439 | void __init parse_early_param(void) | |
440 | { | |
dd4d9fec FF |
441 | static int done __initdata; |
442 | static char tmp_cmdline[COMMAND_LINE_SIZE] __initdata; | |
1da177e4 LT |
443 | |
444 | if (done) | |
445 | return; | |
446 | ||
447 | /* All fall through to do_early_param. */ | |
30d7e0d4 | 448 | strlcpy(tmp_cmdline, boot_command_line, COMMAND_LINE_SIZE); |
13977091 | 449 | parse_early_options(tmp_cmdline); |
1da177e4 LT |
450 | done = 1; |
451 | } | |
452 | ||
e7ff3a47 TG |
453 | void __init __weak arch_post_acpi_subsys_init(void) { } |
454 | ||
839ad62e | 455 | void __init __weak smp_setup_processor_id(void) |
033ab7f8 AM |
456 | { |
457 | } | |
458 | ||
eded09cc | 459 | # if THREAD_SIZE >= PAGE_SIZE |
b235beea | 460 | void __init __weak thread_stack_cache_init(void) |
8c9843e5 BH |
461 | { |
462 | } | |
eded09cc | 463 | #endif |
8c9843e5 | 464 | |
444f478f PE |
465 | /* |
466 | * Set up kernel memory allocators | |
467 | */ | |
468 | static void __init mm_init(void) | |
469 | { | |
eefa864b JK |
470 | /* |
471 | * page_ext requires contiguous pages, | |
472 | * bigger than MAX_ORDER unless SPARSEMEM. | |
473 | */ | |
474 | page_ext_init_flatmem(); | |
444f478f PE |
475 | mem_init(); |
476 | kmem_cache_init(); | |
099a19d9 | 477 | percpu_init_late(); |
b35f1819 | 478 | pgtable_init(); |
444f478f | 479 | vmalloc_init(); |
0ddab1d2 | 480 | ioremap_huge_init(); |
444f478f PE |
481 | } |
482 | ||
722a9f92 | 483 | asmlinkage __visible void __init start_kernel(void) |
1da177e4 | 484 | { |
dd4d9fec FF |
485 | char *command_line; |
486 | char *after_dashes; | |
033ab7f8 | 487 | |
d4311ff1 | 488 | set_task_stack_end_magic(&init_task); |
73839c5b | 489 | smp_setup_processor_id(); |
3ac7fe5a | 490 | debug_objects_early_init(); |
42059429 IM |
491 | |
492 | /* | |
493 | * Set up the the initial canary ASAP: | |
494 | */ | |
495 | boot_init_stack_canary(); | |
496 | ||
ddbcc7e8 | 497 | cgroup_init_early(); |
fbb9ce95 IM |
498 | |
499 | local_irq_disable(); | |
2ce802f6 | 500 | early_boot_irqs_disabled = true; |
fbb9ce95 | 501 | |
1da177e4 LT |
502 | /* |
503 | * Interrupts are still disabled. Do necessary setups, then | |
504 | * enable them | |
505 | */ | |
44fd2299 | 506 | boot_cpu_init(); |
1da177e4 | 507 | page_address_init(); |
ea676e84 | 508 | pr_notice("%s", linux_banner); |
1da177e4 | 509 | setup_arch(&command_line); |
6345d24d | 510 | mm_init_cpumask(&init_mm); |
30d7e0d4 | 511 | setup_command_line(command_line); |
e0982e90 | 512 | setup_nr_cpu_ids(); |
d6647bdf | 513 | setup_per_cpu_areas(); |
cff7d378 | 514 | boot_cpu_state_init(); |
44fd2299 | 515 | smp_prepare_boot_cpu(); /* arch-specific boot-cpu hooks */ |
1da177e4 | 516 | |
9adb62a5 | 517 | build_all_zonelists(NULL, NULL); |
83b519e8 PE |
518 | page_alloc_init(); |
519 | ||
ea676e84 | 520 | pr_notice("Kernel command line: %s\n", boot_command_line); |
83b519e8 | 521 | parse_early_param(); |
51e158c1 RR |
522 | after_dashes = parse_args("Booting kernel", |
523 | static_command_line, __start___param, | |
524 | __stop___param - __start___param, | |
ecc86170 | 525 | -1, -1, NULL, &unknown_bootoption); |
3438cf54 | 526 | if (!IS_ERR_OR_NULL(after_dashes)) |
51e158c1 | 527 | parse_args("Setting init args", after_dashes, NULL, 0, -1, -1, |
ecc86170 | 528 | NULL, set_init_arg); |
97ce2c88 JF |
529 | |
530 | jump_label_init(); | |
531 | ||
83b519e8 PE |
532 | /* |
533 | * These use large bootmem allocations and must precede | |
534 | * kmem_cache_init() | |
535 | */ | |
162a7e75 | 536 | setup_log_buf(0); |
83b519e8 | 537 | pidhash_init(); |
83b519e8 PE |
538 | vfs_caches_init_early(); |
539 | sort_main_extable(); | |
540 | trap_init(); | |
444f478f | 541 | mm_init(); |
de03c72c | 542 | |
1da177e4 LT |
543 | /* |
544 | * Set up the scheduler prior starting any interrupts (such as the | |
545 | * timer interrupt). Full topology setup happens at smp_init() | |
546 | * time - but meanwhile we still have a functioning scheduler. | |
547 | */ | |
548 | sched_init(); | |
549 | /* | |
550 | * Disable preemption - early bootup scheduling is extremely | |
551 | * fragile until we cpu_idle() for the first time. | |
552 | */ | |
553 | preempt_disable(); | |
dd4d9fec FF |
554 | if (WARN(!irqs_disabled(), |
555 | "Interrupts were enabled *very* early, fixing it\n")) | |
c4a68306 | 556 | local_irq_disable(); |
9f58a205 | 557 | idr_init_cache(); |
3347fa09 TH |
558 | |
559 | /* | |
560 | * Allow workqueue creation and work item queueing/cancelling | |
561 | * early. Work item execution depends on kthreads and starts after | |
562 | * workqueue_init(). | |
563 | */ | |
564 | workqueue_init_early(); | |
565 | ||
1da177e4 | 566 | rcu_init(); |
5f893b26 SRRH |
567 | |
568 | /* trace_printk() and trace points may be used after this */ | |
569 | trace_init(); | |
570 | ||
65f382fd | 571 | context_tracking_init(); |
773e3eb7 | 572 | radix_tree_init(); |
0b8f1efa YL |
573 | /* init some links before init_ISA_irqs() */ |
574 | early_irq_init(); | |
1da177e4 | 575 | init_IRQ(); |
ad2b1353 | 576 | tick_init(); |
d6dd50e0 | 577 | rcu_init_nohz(); |
1da177e4 | 578 | init_timers(); |
c0a31329 | 579 | hrtimers_init(); |
1da177e4 | 580 | softirq_init(); |
ad596171 | 581 | timekeeping_init(); |
88fecaa2 | 582 | time_init(); |
38ff87f7 | 583 | sched_clock_postinit(); |
f92bac3b | 584 | printk_safe_init(); |
9e630205 | 585 | perf_event_init(); |
93e02814 | 586 | profile_init(); |
d8ad7d11 | 587 | call_function_init(); |
f91eb62f | 588 | WARN(!irqs_disabled(), "Interrupts were enabled early\n"); |
2ce802f6 | 589 | early_boot_irqs_disabled = false; |
93e02814 | 590 | local_irq_enable(); |
dcce284a | 591 | |
7e85ee0c | 592 | kmem_cache_init_late(); |
1da177e4 LT |
593 | |
594 | /* | |
595 | * HACK ALERT! This is early. We're enabling the console before | |
596 | * we've done PCI setups etc, and console_init() must be aware of | |
597 | * this. But we do want output early, in case something goes wrong. | |
598 | */ | |
599 | console_init(); | |
600 | if (panic_later) | |
499a4584 TH |
601 | panic("Too many boot %s vars at `%s'", panic_later, |
602 | panic_param); | |
fbb9ce95 IM |
603 | |
604 | lockdep_info(); | |
605 | ||
9a11b49a IM |
606 | /* |
607 | * Need to run this when irqs are enabled, because it wants | |
608 | * to self-test [hard/soft]-irqs on/off lock inversion bugs | |
609 | * too: | |
610 | */ | |
611 | locking_selftest(); | |
612 | ||
1da177e4 LT |
613 | #ifdef CONFIG_BLK_DEV_INITRD |
614 | if (initrd_start && !initrd_below_start_ok && | |
bd673c7c | 615 | page_to_pfn(virt_to_page((void *)initrd_start)) < min_low_pfn) { |
ea676e84 | 616 | pr_crit("initrd overwritten (0x%08lx < 0x%08lx) - disabling it.\n", |
bd673c7c GU |
617 | page_to_pfn(virt_to_page((void *)initrd_start)), |
618 | min_low_pfn); | |
1da177e4 LT |
619 | initrd_start = 0; |
620 | } | |
621 | #endif | |
fe53ca54 | 622 | page_ext_init(); |
3ac7fe5a | 623 | debug_objects_mem_init(); |
9b090f2d | 624 | kmemleak_init(); |
e7c8d5c9 | 625 | setup_per_cpu_pageset(); |
1da177e4 LT |
626 | numa_policy_init(); |
627 | if (late_time_init) | |
628 | late_time_init(); | |
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(); |
62906027 | 650 | pagecache_init(); |
1da177e4 | 651 | signals_init(); |
1da177e4 | 652 | proc_root_init(); |
e149ed2b | 653 | nsfs_init(); |
1da177e4 | 654 | cpuset_init(); |
695df213 | 655 | cgroup_init(); |
c757249a | 656 | taskstats_init_early(); |
ca74e92b | 657 | delayacct_init(); |
1da177e4 LT |
658 | |
659 | check_bugs(); | |
660 | ||
b064a8fa | 661 | acpi_subsystem_init(); |
e7ff3a47 | 662 | arch_post_acpi_subsys_init(); |
6ae6996a | 663 | sfi_init_late(); |
1da177e4 | 664 | |
83e68189 | 665 | if (efi_enabled(EFI_RUNTIME_SERVICES)) { |
78510792 | 666 | efi_free_boot_services(); |
2223af38 | 667 | } |
78510792 | 668 | |
68bf21aa SR |
669 | ftrace_init(); |
670 | ||
1da177e4 LT |
671 | /* Do the rest non-__init'ed, we're now alive */ |
672 | rest_init(); | |
673 | } | |
674 | ||
b99b87f7 PO |
675 | /* Call all constructor functions linked into the kernel. */ |
676 | static void __init do_ctors(void) | |
677 | { | |
678 | #ifdef CONFIG_CONSTRUCTORS | |
196a15b4 | 679 | ctor_fn_t *fn = (ctor_fn_t *) __ctors_start; |
b99b87f7 | 680 | |
196a15b4 HS |
681 | for (; fn < (ctor_fn_t *) __ctors_end; fn++) |
682 | (*fn)(); | |
b99b87f7 PO |
683 | #endif |
684 | } | |
685 | ||
2329abfa | 686 | bool initcall_debug; |
d0ea3d7d | 687 | core_param(initcall_debug, initcall_debug, bool, 0644); |
1da177e4 | 688 | |
7b0b73d7 PB |
689 | #ifdef CONFIG_KALLSYMS |
690 | struct blacklist_entry { | |
691 | struct list_head next; | |
692 | char *buf; | |
693 | }; | |
694 | ||
695 | static __initdata_or_module LIST_HEAD(blacklisted_initcalls); | |
696 | ||
697 | static int __init initcall_blacklist(char *str) | |
698 | { | |
699 | char *str_entry; | |
700 | struct blacklist_entry *entry; | |
701 | ||
702 | /* str argument is a comma-separated list of functions */ | |
703 | do { | |
704 | str_entry = strsep(&str, ","); | |
705 | if (str_entry) { | |
706 | pr_debug("blacklisting initcall %s\n", str_entry); | |
707 | entry = alloc_bootmem(sizeof(*entry)); | |
708 | entry->buf = alloc_bootmem(strlen(str_entry) + 1); | |
709 | strcpy(entry->buf, str_entry); | |
710 | list_add(&entry->next, &blacklisted_initcalls); | |
711 | } | |
712 | } while (str_entry); | |
713 | ||
714 | return 0; | |
715 | } | |
716 | ||
717 | static bool __init_or_module initcall_blacklisted(initcall_t fn) | |
718 | { | |
7b0b73d7 | 719 | struct blacklist_entry *entry; |
c8cdd2be | 720 | char fn_name[KSYM_SYMBOL_LEN]; |
0fd5ed8d | 721 | unsigned long addr; |
7b0b73d7 | 722 | |
c8cdd2be | 723 | if (list_empty(&blacklisted_initcalls)) |
7b0b73d7 PB |
724 | return false; |
725 | ||
0fd5ed8d RV |
726 | addr = (unsigned long) dereference_function_descriptor(fn); |
727 | sprint_symbol_no_offset(fn_name, addr); | |
c8cdd2be | 728 | |
841c06d7 PB |
729 | /* |
730 | * fn will be "function_name [module_name]" where [module_name] is not | |
731 | * displayed for built-in init functions. Strip off the [module_name]. | |
732 | */ | |
733 | strreplace(fn_name, ' ', '\0'); | |
734 | ||
e6fd1fb3 | 735 | list_for_each_entry(entry, &blacklisted_initcalls, next) { |
7b0b73d7 PB |
736 | if (!strcmp(fn_name, entry->buf)) { |
737 | pr_debug("initcall %s blacklisted\n", fn_name); | |
7b0b73d7 PB |
738 | return true; |
739 | } | |
740 | } | |
741 | ||
7b0b73d7 PB |
742 | return false; |
743 | } | |
744 | #else | |
745 | static int __init initcall_blacklist(char *str) | |
746 | { | |
747 | pr_warn("initcall_blacklist requires CONFIG_KALLSYMS\n"); | |
748 | return 0; | |
749 | } | |
750 | ||
751 | static bool __init_or_module initcall_blacklisted(initcall_t fn) | |
752 | { | |
753 | return false; | |
754 | } | |
755 | #endif | |
756 | __setup("initcall_blacklist=", initcall_blacklist); | |
757 | ||
e4461271 | 758 | static int __init_or_module do_one_initcall_debug(initcall_t fn) |
1da177e4 | 759 | { |
74239072 | 760 | ktime_t calltime, delta, rettime; |
30dbb20e AW |
761 | unsigned long long duration; |
762 | int ret; | |
1da177e4 | 763 | |
d62cf815 | 764 | printk(KERN_DEBUG "calling %pF @ %i\n", fn, task_pid_nr(current)); |
22c5c03b | 765 | calltime = ktime_get(); |
30dbb20e | 766 | ret = fn(); |
22c5c03b KW |
767 | rettime = ktime_get(); |
768 | delta = ktime_sub(rettime, calltime); | |
769 | duration = (unsigned long long) ktime_to_ns(delta) >> 10; | |
d62cf815 | 770 | printk(KERN_DEBUG "initcall %pF returned %d after %lld usecs\n", |
ea676e84 | 771 | fn, ret, duration); |
1da177e4 | 772 | |
22c5c03b KW |
773 | return ret; |
774 | } | |
775 | ||
e4461271 | 776 | int __init_or_module do_one_initcall(initcall_t fn) |
22c5c03b KW |
777 | { |
778 | int count = preempt_count(); | |
779 | int ret; | |
ff1c8fac | 780 | char msgbuf[64]; |
22c5c03b | 781 | |
7b0b73d7 PB |
782 | if (initcall_blacklisted(fn)) |
783 | return -EPERM; | |
784 | ||
22c5c03b KW |
785 | if (initcall_debug) |
786 | ret = do_one_initcall_debug(fn); | |
787 | else | |
788 | ret = fn(); | |
8f0c45cd | 789 | |
e0df154f | 790 | msgbuf[0] = 0; |
e662e1cf | 791 | |
e0df154f | 792 | if (preempt_count() != count) { |
bf5d770b | 793 | sprintf(msgbuf, "preemption imbalance "); |
4a2b4b22 | 794 | preempt_count_set(count); |
1da177e4 | 795 | } |
e0df154f | 796 | if (irqs_disabled()) { |
a76bfd0d | 797 | strlcat(msgbuf, "disabled interrupts ", sizeof(msgbuf)); |
e0df154f LT |
798 | local_irq_enable(); |
799 | } | |
f91eb62f | 800 | WARN(msgbuf[0], "initcall %pF returned with %s\n", fn, msgbuf); |
59f9415f | 801 | |
38addce8 | 802 | add_latent_entropy(); |
30dbb20e | 803 | return ret; |
e0df154f LT |
804 | } |
805 | ||
806 | ||
026cee00 PM |
807 | extern initcall_t __initcall_start[]; |
808 | extern initcall_t __initcall0_start[]; | |
809 | extern initcall_t __initcall1_start[]; | |
810 | extern initcall_t __initcall2_start[]; | |
811 | extern initcall_t __initcall3_start[]; | |
812 | extern initcall_t __initcall4_start[]; | |
813 | extern initcall_t __initcall5_start[]; | |
814 | extern initcall_t __initcall6_start[]; | |
815 | extern initcall_t __initcall7_start[]; | |
816 | extern initcall_t __initcall_end[]; | |
817 | ||
818 | static initcall_t *initcall_levels[] __initdata = { | |
819 | __initcall0_start, | |
820 | __initcall1_start, | |
821 | __initcall2_start, | |
822 | __initcall3_start, | |
823 | __initcall4_start, | |
824 | __initcall5_start, | |
825 | __initcall6_start, | |
826 | __initcall7_start, | |
827 | __initcall_end, | |
828 | }; | |
829 | ||
96263d28 | 830 | /* Keep these in sync with initcalls in include/linux/init.h */ |
026cee00 | 831 | static char *initcall_level_names[] __initdata = { |
9fb48c74 JC |
832 | "early", |
833 | "core", | |
834 | "postcore", | |
835 | "arch", | |
836 | "subsys", | |
837 | "fs", | |
838 | "device", | |
839 | "late", | |
026cee00 PM |
840 | }; |
841 | ||
026cee00 | 842 | static void __init do_initcall_level(int level) |
e0df154f | 843 | { |
196a15b4 | 844 | initcall_t *fn; |
e0df154f | 845 | |
08746a65 | 846 | strcpy(initcall_command_line, saved_command_line); |
026cee00 | 847 | parse_args(initcall_level_names[level], |
08746a65 | 848 | initcall_command_line, __start___param, |
026cee00 PM |
849 | __stop___param - __start___param, |
850 | level, level, | |
ecc86170 | 851 | NULL, &repair_env_string); |
026cee00 PM |
852 | |
853 | for (fn = initcall_levels[level]; fn < initcall_levels[level+1]; fn++) | |
196a15b4 | 854 | do_one_initcall(*fn); |
1da177e4 LT |
855 | } |
856 | ||
026cee00 PM |
857 | static void __init do_initcalls(void) |
858 | { | |
859 | int level; | |
860 | ||
19efb72f | 861 | for (level = 0; level < ARRAY_SIZE(initcall_levels) - 1; level++) |
026cee00 PM |
862 | do_initcall_level(level); |
863 | } | |
864 | ||
1da177e4 LT |
865 | /* |
866 | * Ok, the machine is now initialized. None of the devices | |
867 | * have been touched yet, but the CPU subsystem is up and | |
868 | * running, and memory and process management works. | |
869 | * | |
870 | * Now we can finally start doing some real work.. | |
871 | */ | |
872 | static void __init do_basic_setup(void) | |
873 | { | |
759ee091 | 874 | cpuset_init_smp(); |
41ffe5d5 | 875 | shmem_init(); |
1da177e4 | 876 | driver_init(); |
b04c3afb | 877 | init_irq_proc(); |
b99b87f7 | 878 | do_ctors(); |
d5767c53 | 879 | usermodehelper_enable(); |
b0f84374 | 880 | do_initcalls(); |
47d06e53 | 881 | random_int_secret_init(); |
1da177e4 LT |
882 | } |
883 | ||
7babe8db | 884 | static void __init do_pre_smp_initcalls(void) |
c2147a50 | 885 | { |
196a15b4 | 886 | initcall_t *fn; |
c2147a50 | 887 | |
026cee00 | 888 | for (fn = __initcall_start; fn < __initcall0_start; fn++) |
196a15b4 | 889 | do_one_initcall(*fn); |
c2147a50 EGM |
890 | } |
891 | ||
bb813f4c TH |
892 | /* |
893 | * This function requests modules which should be loaded by default and is | |
894 | * called twice right after initrd is mounted and right before init is | |
895 | * exec'd. If such modules are on either initrd or rootfs, they will be | |
896 | * loaded before control is passed to userland. | |
897 | */ | |
898 | void __init load_default_modules(void) | |
899 | { | |
900 | load_default_elevator_module(); | |
901 | } | |
902 | ||
a74fb73c | 903 | static int run_init_process(const char *init_filename) |
1da177e4 LT |
904 | { |
905 | argv_init[0] = init_filename; | |
c4ad8f98 | 906 | return do_execve(getname_kernel(init_filename), |
ae903caa AV |
907 | (const char __user *const __user *)argv_init, |
908 | (const char __user *const __user *)envp_init); | |
1da177e4 LT |
909 | } |
910 | ||
ba24762b MO |
911 | static int try_to_run_init_process(const char *init_filename) |
912 | { | |
913 | int ret; | |
914 | ||
915 | ret = run_init_process(init_filename); | |
916 | ||
917 | if (ret && ret != -ENOENT) { | |
918 | pr_err("Starting init: %s exists but couldn't execute it (error %d)\n", | |
919 | init_filename, ret); | |
920 | } | |
921 | ||
922 | return ret; | |
923 | } | |
924 | ||
f80b0c90 | 925 | static noinline void __init kernel_init_freeable(void); |
d6b21238 | 926 | |
0f5bf6d0 | 927 | #if defined(CONFIG_STRICT_KERNEL_RWX) || defined(CONFIG_STRICT_MODULE_RWX) |
39290b38 | 928 | bool rodata_enabled __ro_after_init = true; |
d2aa1aca KC |
929 | static int __init set_debug_rodata(char *str) |
930 | { | |
931 | return strtobool(str, &rodata_enabled); | |
932 | } | |
933 | __setup("rodata=", set_debug_rodata); | |
39290b38 | 934 | #endif |
d2aa1aca | 935 | |
0f5bf6d0 | 936 | #ifdef CONFIG_STRICT_KERNEL_RWX |
d2aa1aca KC |
937 | static void mark_readonly(void) |
938 | { | |
939 | if (rodata_enabled) | |
940 | mark_rodata_ro(); | |
941 | else | |
942 | pr_info("Kernel memory protection disabled.\n"); | |
943 | } | |
944 | #else | |
945 | static inline void mark_readonly(void) | |
946 | { | |
947 | pr_warn("This architecture does not have kernel memory protection.\n"); | |
948 | } | |
949 | #endif | |
950 | ||
d6b21238 | 951 | static int __ref kernel_init(void *unused) |
ee5bfa64 | 952 | { |
ba24762b MO |
953 | int ret; |
954 | ||
d6b21238 | 955 | kernel_init_freeable(); |
22a9d645 AV |
956 | /* need to finish all async __init code before freeing the memory */ |
957 | async_synchronize_full(); | |
ee5bfa64 | 958 | free_initmem(); |
d2aa1aca | 959 | mark_readonly(); |
ee5bfa64 VG |
960 | system_state = SYSTEM_RUNNING; |
961 | numa_default_policy(); | |
962 | ||
4a9d4b02 | 963 | flush_delayed_fput(); |
fae5fa44 | 964 | |
967dcb8f PM |
965 | rcu_end_inkernel_boot(); |
966 | ||
ee5bfa64 | 967 | if (ramdisk_execute_command) { |
ba24762b MO |
968 | ret = run_init_process(ramdisk_execute_command); |
969 | if (!ret) | |
a74fb73c | 970 | return 0; |
ba24762b MO |
971 | pr_err("Failed to execute %s (error %d)\n", |
972 | ramdisk_execute_command, ret); | |
ee5bfa64 VG |
973 | } |
974 | ||
975 | /* | |
976 | * We try each of these until one succeeds. | |
977 | * | |
978 | * The Bourne shell can be used instead of init if we are | |
979 | * trying to recover a really broken machine. | |
980 | */ | |
981 | if (execute_command) { | |
ba24762b MO |
982 | ret = run_init_process(execute_command); |
983 | if (!ret) | |
a74fb73c | 984 | return 0; |
6ef4536e AL |
985 | panic("Requested init %s failed (error %d).", |
986 | execute_command, ret); | |
ee5bfa64 | 987 | } |
ba24762b MO |
988 | if (!try_to_run_init_process("/sbin/init") || |
989 | !try_to_run_init_process("/etc/init") || | |
990 | !try_to_run_init_process("/bin/init") || | |
991 | !try_to_run_init_process("/bin/sh")) | |
a74fb73c | 992 | return 0; |
ee5bfa64 | 993 | |
ba24762b | 994 | panic("No working init found. Try passing init= option to kernel. " |
8c27ceff | 995 | "See Linux Documentation/admin-guide/init.rst for guidance."); |
ee5bfa64 VG |
996 | } |
997 | ||
f80b0c90 | 998 | static noinline void __init kernel_init_freeable(void) |
1da177e4 | 999 | { |
b433c3d4 PZ |
1000 | /* |
1001 | * Wait until kthreadd is all set-up. | |
1002 | */ | |
1003 | wait_for_completion(&kthreadd_done); | |
31a67102 LT |
1004 | |
1005 | /* Now the scheduler is fully set up and can do blocking allocations */ | |
1006 | gfp_allowed_mask = __GFP_BITS_MASK; | |
1007 | ||
58568d2a MX |
1008 | /* |
1009 | * init can allocate pages on any node | |
1010 | */ | |
3c466d46 | 1011 | set_mems_allowed(node_states[N_MEMORY]); |
1da177e4 LT |
1012 | /* |
1013 | * init can run on any cpu. | |
1014 | */ | |
1a2142af | 1015 | set_cpus_allowed_ptr(current, cpu_all_mask); |
1da177e4 | 1016 | |
9ec52099 CLG |
1017 | cad_pid = task_pid(current); |
1018 | ||
ca74a6f8 | 1019 | smp_prepare_cpus(setup_max_cpus); |
1da177e4 | 1020 | |
3347fa09 TH |
1021 | workqueue_init(); |
1022 | ||
1da177e4 | 1023 | do_pre_smp_initcalls(); |
004417a6 | 1024 | lockup_detector_init(); |
1da177e4 | 1025 | |
1da177e4 LT |
1026 | smp_init(); |
1027 | sched_init_smp(); | |
1028 | ||
0e1cc95b MG |
1029 | page_alloc_init_late(); |
1030 | ||
1da177e4 LT |
1031 | do_basic_setup(); |
1032 | ||
2bd3a997 EB |
1033 | /* Open the /dev/console on the rootfs, this should never fail */ |
1034 | if (sys_open((const char __user *) "/dev/console", O_RDWR, 0) < 0) | |
ea676e84 | 1035 | pr_err("Warning: unable to open an initial console.\n"); |
2bd3a997 EB |
1036 | |
1037 | (void) sys_dup(0); | |
1038 | (void) sys_dup(0); | |
1da177e4 LT |
1039 | /* |
1040 | * check if there is an early userspace init. If yes, let it do all | |
1041 | * the work | |
1042 | */ | |
ffdfc409 OJ |
1043 | |
1044 | if (!ramdisk_execute_command) | |
1045 | ramdisk_execute_command = "/init"; | |
1046 | ||
1047 | if (sys_access((const char __user *) ramdisk_execute_command, 0) != 0) { | |
1048 | ramdisk_execute_command = NULL; | |
1da177e4 | 1049 | prepare_namespace(); |
ffdfc409 | 1050 | } |
1da177e4 LT |
1051 | |
1052 | /* | |
1053 | * Ok, we have completed the initial bootup, and | |
1054 | * we're essentially up and running. Get rid of the | |
1055 | * initmem segments and start the user-mode stuff.. | |
c9cd2ce2 DK |
1056 | * |
1057 | * rootfs is available now, try loading the public keys | |
1058 | * and default modules | |
1da177e4 | 1059 | */ |
bb813f4c | 1060 | |
c9cd2ce2 | 1061 | integrity_load_keys(); |
bb813f4c | 1062 | load_default_modules(); |
1da177e4 | 1063 | } |