dmar: fix using early fixmap mapping for DMAR table parsing
[deliverable/linux.git] / init / main.c
CommitLineData
1da177e4
LT
1/*
2 * linux/init/main.c
3 *
4 * Copyright (C) 1991, 1992 Linus Torvalds
5 *
6 * GK 2/5/95 - Changed to support mounting root fs via NFS
7 * Added initrd & change_root: Werner Almesberger & Hans Lermen, Feb '96
8 * Moan early if gcc is old, avoiding bogus kernels - Paul Gortmaker, May '96
9 * Simplified starting of init: Michael A. Griffith <grif@acm.org>
10 */
11
1da177e4
LT
12#include <linux/types.h>
13#include <linux/module.h>
14#include <linux/proc_fs.h>
1da177e4
LT
15#include <linux/kernel.h>
16#include <linux/syscalls.h>
17#include <linux/string.h>
18#include <linux/ctype.h>
19#include <linux/delay.h>
20#include <linux/utsname.h>
21#include <linux/ioport.h>
22#include <linux/init.h>
23#include <linux/smp_lock.h>
24#include <linux/initrd.h>
1da177e4
LT
25#include <linux/bootmem.h>
26#include <linux/tty.h>
27#include <linux/gfp.h>
28#include <linux/percpu.h>
29#include <linux/kmod.h>
30#include <linux/kernel_stat.h>
d7cd5611 31#include <linux/start_kernel.h>
1da177e4 32#include <linux/security.h>
3d442233 33#include <linux/smp.h>
1da177e4
LT
34#include <linux/workqueue.h>
35#include <linux/profile.h>
36#include <linux/rcupdate.h>
37#include <linux/moduleparam.h>
38#include <linux/kallsyms.h>
39#include <linux/writeback.h>
40#include <linux/cpu.h>
41#include <linux/cpuset.h>
ddbcc7e8 42#include <linux/cgroup.h>
1da177e4 43#include <linux/efi.h>
906568c9 44#include <linux/tick.h>
6168a702 45#include <linux/interrupt.h>
c757249a 46#include <linux/taskstats_kern.h>
ca74e92b 47#include <linux/delayacct.h>
1da177e4
LT
48#include <linux/unistd.h>
49#include <linux/rmap.h>
50#include <linux/mempolicy.h>
51#include <linux/key.h>
4552d5dc 52#include <linux/unwind.h>
b6cd0b77 53#include <linux/buffer_head.h>
9a11b49a 54#include <linux/debug_locks.h>
3ac7fe5a 55#include <linux/debugobjects.h>
fbb9ce95 56#include <linux/lockdep.h>
84d73786 57#include <linux/pid_namespace.h>
1f21782e 58#include <linux/device.h>
73c27992 59#include <linux/kthread.h>
e6fe6649 60#include <linux/sched.h>
a1c9eea9 61#include <linux/signal.h>
199f0ca5 62#include <linux/idr.h>
1da177e4
LT
63
64#include <asm/io.h>
65#include <asm/bugs.h>
66#include <asm/setup.h>
a940199f 67#include <asm/sections.h>
37b73c82 68#include <asm/cacheflush.h>
1da177e4 69
1da177e4
LT
70#ifdef CONFIG_X86_LOCAL_APIC
71#include <asm/smp.h>
72#endif
73
74/*
69c99ac1
CQH
75 * This is one of the first .c files built. Error out early if we have compiler
76 * trouble.
1da177e4 77 */
1da177e4 78
f1a60dbf
AM
79#if __GNUC__ == 4 && __GNUC_MINOR__ == 1 && __GNUC_PATCHLEVEL__ == 0
80#warning gcc-4.1.0 is known to miscompile the kernel. A different compiler version is recommended.
81#endif
82
aae5f662 83static int kernel_init(void *);
1da177e4
LT
84
85extern void init_IRQ(void);
1da177e4
LT
86extern void fork_init(unsigned long);
87extern void mca_init(void);
88extern void sbus_init(void);
1da177e4
LT
89extern void prio_tree_init(void);
90extern void radix_tree_init(void);
91extern void free_initmem(void);
1da177e4
LT
92#ifdef CONFIG_ACPI
93extern void acpi_early_init(void);
94#else
95static inline void acpi_early_init(void) { }
96#endif
37b73c82
AV
97#ifndef CONFIG_DEBUG_RODATA
98static inline void mark_rodata_ro(void) { }
99#endif
1da177e4
LT
100
101#ifdef CONFIG_TC
102extern void tc_init(void);
103#endif
104
105enum system_states system_state;
106EXPORT_SYMBOL(system_state);
107
108/*
109 * Boot command-line arguments
110 */
111#define MAX_INIT_ARGS CONFIG_INIT_ENV_ARG_LIMIT
112#define MAX_INIT_ENVS CONFIG_INIT_ENV_ARG_LIMIT
113
114extern void time_init(void);
115/* Default late time init is NULL. archs can override this later. */
116void (*late_time_init)(void);
117extern void softirq_init(void);
118
30d7e0d4
ABL
119/* Untouched command line saved by arch-specific code. */
120char __initdata boot_command_line[COMMAND_LINE_SIZE];
121/* Untouched saved command line (eg. for /proc) */
122char *saved_command_line;
123/* Command line for parameter parsing */
124static char *static_command_line;
1da177e4
LT
125
126static char *execute_command;
ffdfc409 127static char *ramdisk_execute_command;
1da177e4 128
8b3b2955 129#ifdef CONFIG_SMP
1da177e4 130/* Setup configured maximum number of CPUs to activate */
ca74a6f8 131unsigned int __initdata setup_max_cpus = NR_CPUS;
7e96287d 132
1da177e4
LT
133/*
134 * Setup routine for controlling SMP activation
135 *
136 * Command-line option of "nosmp" or "maxcpus=0" will disable SMP
137 * activation entirely (the MPS table probe still happens, though).
138 *
139 * Command-line option of "maxcpus=<NUM>", where <NUM> is an integer
140 * greater than 0, limits the maximum number of CPUs activated in
141 * SMP mode to <NUM>.
142 */
61ec7567
LB
143#ifndef CONFIG_X86_IO_APIC
144static inline void disable_ioapic_setup(void) {};
145#endif
146
1da177e4
LT
147static int __init nosmp(char *str)
148{
ca74a6f8 149 setup_max_cpus = 0;
61ec7567 150 disable_ioapic_setup();
8b3b2955 151 return 0;
1da177e4
LT
152}
153
8b3b2955 154early_param("nosmp", nosmp);
1da177e4
LT
155
156static int __init maxcpus(char *str)
157{
ca74a6f8
AK
158 get_option(&str, &setup_max_cpus);
159 if (setup_max_cpus == 0)
61ec7567
LB
160 disable_ioapic_setup();
161
162 return 0;
1da177e4
LT
163}
164
81340977 165early_param("maxcpus", maxcpus);
8b3b2955 166#else
ca74a6f8 167#define setup_max_cpus NR_CPUS
8b3b2955
JB
168#endif
169
170/*
171 * If set, this is an indication to the drivers that reset the underlying
172 * device before going ahead with the initialization otherwise driver might
173 * rely on the BIOS and skip the reset operation.
174 *
175 * This is useful if kernel is booting in an unreliable environment.
176 * For ex. kdump situaiton where previous kernel has crashed, BIOS has been
177 * skipped and devices will be in unknown state.
178 */
179unsigned int reset_devices;
180EXPORT_SYMBOL(reset_devices);
1da177e4 181
7e96287d
VG
182static int __init set_reset_devices(char *str)
183{
184 reset_devices = 1;
185 return 1;
186}
187
188__setup("reset_devices", set_reset_devices);
189
1da177e4
LT
190static char * argv_init[MAX_INIT_ARGS+2] = { "init", NULL, };
191char * envp_init[MAX_INIT_ENVS+2] = { "HOME=/", "TERM=linux", NULL, };
192static const char *panic_later, *panic_param;
193
194extern struct obs_kernel_param __setup_start[], __setup_end[];
195
196static int __init obsolete_checksetup(char *line)
197{
198 struct obs_kernel_param *p;
33df0d19 199 int had_early_param = 0;
1da177e4
LT
200
201 p = __setup_start;
202 do {
203 int n = strlen(p->str);
204 if (!strncmp(line, p->str, n)) {
205 if (p->early) {
33df0d19
RR
206 /* Already done in parse_early_param?
207 * (Needs exact match on param part).
208 * Keep iterating, as we can have early
209 * params and __setups of same names 8( */
1da177e4 210 if (line[n] == '\0' || line[n] == '=')
33df0d19 211 had_early_param = 1;
1da177e4
LT
212 } else if (!p->setup_func) {
213 printk(KERN_WARNING "Parameter %s is obsolete,"
214 " ignored\n", p->str);
215 return 1;
216 } else if (p->setup_func(line + n))
217 return 1;
218 }
219 p++;
220 } while (p < __setup_end);
33df0d19
RR
221
222 return had_early_param;
1da177e4
LT
223}
224
225/*
226 * This should be approx 2 Bo*oMips to start (note initial shift), and will
227 * still work even if initially too large, it will just take slightly longer
228 */
229unsigned long loops_per_jiffy = (1<<12);
230
231EXPORT_SYMBOL(loops_per_jiffy);
232
233static int __init debug_kernel(char *str)
234{
1da177e4 235 console_loglevel = 10;
f6f21c81 236 return 0;
1da177e4
LT
237}
238
239static int __init quiet_kernel(char *str)
240{
1da177e4 241 console_loglevel = 4;
f6f21c81 242 return 0;
1da177e4
LT
243}
244
f6f21c81
YL
245early_param("debug", debug_kernel);
246early_param("quiet", quiet_kernel);
1da177e4
LT
247
248static int __init loglevel(char *str)
249{
250 get_option(&str, &console_loglevel);
d9d4fcfe 251 return 0;
1da177e4
LT
252}
253
f6f21c81 254early_param("loglevel", loglevel);
1da177e4
LT
255
256/*
257 * Unknown boot options get handed to init, unless they look like
258 * failed parameters
259 */
260static int __init unknown_bootoption(char *param, char *val)
261{
262 /* Change NUL term back to "=", to make "param" the whole string. */
263 if (val) {
264 /* param=val or param="val"? */
265 if (val == param+strlen(param)+1)
266 val[-1] = '=';
267 else if (val == param+strlen(param)+2) {
268 val[-2] = '=';
269 memmove(val-1, val, strlen(val)+1);
270 val--;
271 } else
272 BUG();
273 }
274
275 /* Handle obsolete-style parameters */
276 if (obsolete_checksetup(param))
277 return 0;
278
279 /*
211fee8a 280 * Preemptive maintenance for "why didn't my misspelled command
1da177e4
LT
281 * line work?"
282 */
283 if (strchr(param, '.') && (!val || strchr(param, '.') < val)) {
284 printk(KERN_ERR "Unknown boot option `%s': ignoring\n", param);
285 return 0;
286 }
287
288 if (panic_later)
289 return 0;
290
291 if (val) {
292 /* Environment option */
293 unsigned int i;
294 for (i = 0; envp_init[i]; i++) {
295 if (i == MAX_INIT_ENVS) {
296 panic_later = "Too many boot env vars at `%s'";
297 panic_param = param;
298 }
299 if (!strncmp(param, envp_init[i], val - param))
300 break;
301 }
302 envp_init[i] = param;
303 } else {
304 /* Command line option */
305 unsigned int i;
306 for (i = 0; argv_init[i]; i++) {
307 if (i == MAX_INIT_ARGS) {
308 panic_later = "Too many boot init vars at `%s'";
309 panic_param = param;
310 }
311 }
312 argv_init[i] = param;
313 }
314 return 0;
315}
316
12d6f21e
IM
317#ifdef CONFIG_DEBUG_PAGEALLOC
318int __read_mostly debug_pagealloc_enabled = 0;
319#endif
320
1da177e4
LT
321static 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
338static 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
LT
350#ifndef CONFIG_SMP
351
352#ifdef CONFIG_X86_LOCAL_APIC
353static void __init smp_init(void)
354{
355 APIC_init_uniprocessor();
356}
357#else
358#define smp_init() do { } while (0)
359#endif
360
361static inline void setup_per_cpu_areas(void) { }
e0982e90 362static inline void setup_nr_cpu_ids(void) { }
1da177e4
LT
363static inline void smp_prepare_cpus(unsigned int maxcpus) { }
364
365#else
366
321a8e9d
MT
367#if NR_CPUS > BITS_PER_LONG
368cpumask_t cpu_mask_all __read_mostly = CPU_MASK_ALL;
369EXPORT_SYMBOL(cpu_mask_all);
370#endif
371
e0982e90
MT
372/* Setup number of possible processor ids */
373int nr_cpu_ids __read_mostly = NR_CPUS;
374EXPORT_SYMBOL(nr_cpu_ids);
375
376/* An arch may set nr_cpu_ids earlier if needed, so this would be redundant */
377static void __init setup_nr_cpu_ids(void)
378{
379 int cpu, highest_cpu = 0;
380
381 for_each_possible_cpu(cpu)
382 highest_cpu = cpu;
383
384 nr_cpu_ids = highest_cpu + 1;
385}
386
dd5af90a 387#ifndef CONFIG_HAVE_SETUP_PER_CPU_AREA
b73b459f 388unsigned long __per_cpu_offset[NR_CPUS] __read_mostly;
1da177e4
LT
389
390EXPORT_SYMBOL(__per_cpu_offset);
391
392static void __init setup_per_cpu_areas(void)
393{
1f3fcd4b 394 unsigned long size, i, old_size;
1da177e4 395 char *ptr;
63872f87 396 unsigned long nr_possible_cpus = num_possible_cpus();
1f8ff037
YL
397 unsigned long align = 1;
398 unsigned da_size;
1da177e4
LT
399
400 /* Copy section for each CPU (we discard the original) */
1f3fcd4b 401 old_size = PERCPU_ENOUGH_ROOM;
1f8ff037
YL
402 da_size = per_cpu_dyn_array_size(&align);
403 align = max_t(unsigned long, PAGE_SIZE, align);
404 size = ALIGN(old_size + da_size, align);
b6e3590f 405 ptr = alloc_bootmem_pages(size * nr_possible_cpus);
1da177e4 406
0a945022 407 for_each_possible_cpu(i) {
1da177e4
LT
408 __per_cpu_offset[i] = ptr - __per_cpu_start;
409 memcpy(ptr, __per_cpu_start, __per_cpu_end - __per_cpu_start);
1f3fcd4b 410 per_cpu_alloc_dyn_array(i, ptr + old_size);
63872f87 411 ptr += size;
1da177e4
LT
412 }
413}
dd5af90a 414#endif /* CONFIG_HAVE_SETUP_PER_CPU_AREA */
1da177e4
LT
415
416/* Called by boot processor to activate the rest. */
417static void __init smp_init(void)
418{
53b8a315 419 unsigned int cpu;
1da177e4 420
e761b772
MK
421 /*
422 * Set up the current CPU as possible to migrate to.
423 * The other ones will be done by cpu_up/cpu_down()
424 */
425 cpu = smp_processor_id();
426 cpu_set(cpu, cpu_active_map);
427
1da177e4 428 /* FIXME: This should be done in userspace --RR */
53b8a315 429 for_each_present_cpu(cpu) {
ca74a6f8 430 if (num_online_cpus() >= setup_max_cpus)
1da177e4 431 break;
53b8a315
CL
432 if (!cpu_online(cpu))
433 cpu_up(cpu);
1da177e4
LT
434 }
435
436 /* Any cleanup work */
437 printk(KERN_INFO "Brought up %ld CPUs\n", (long)num_online_cpus());
ca74a6f8 438 smp_cpus_done(setup_max_cpus);
1da177e4
LT
439}
440
441#endif
442
30d7e0d4
ABL
443/*
444 * We need to store the untouched command line for future reference.
445 * We also need to store the touched command line since the parameter
446 * parsing is performed in place, and we should allow a component to
447 * store reference of name/value for future reference.
448 */
449static void __init setup_command_line(char *command_line)
450{
451 saved_command_line = alloc_bootmem(strlen (boot_command_line)+1);
452 static_command_line = alloc_bootmem(strlen (command_line)+1);
453 strcpy (saved_command_line, boot_command_line);
454 strcpy (static_command_line, command_line);
455}
456
1da177e4
LT
457/*
458 * We need to finalize in a non-__init function or else race conditions
459 * between the root thread and the init thread may cause start_kernel to
460 * be reaped by free_initmem before the root thread has proceeded to
461 * cpu_idle.
462 *
463 * gcc-3.4 accidentally inlines this function, so use noinline.
464 */
465
92080309 466static void noinline __init_refok rest_init(void)
1da177e4
LT
467 __releases(kernel_lock)
468{
73c27992
EB
469 int pid;
470
aae5f662 471 kernel_thread(kernel_init, NULL, CLONE_FS | CLONE_SIGHAND);
1da177e4 472 numa_default_policy();
73c27992 473 pid = kernel_thread(kthreadd, NULL, CLONE_FS | CLONE_FILES);
5cd20455 474 kthreadd_task = find_task_by_pid_ns(pid, &init_pid_ns);
1da177e4 475 unlock_kernel();
f340c0d1
IM
476
477 /*
478 * The boot idle thread must execute schedule()
1df21055 479 * at least once to get things moving:
f340c0d1 480 */
1df21055 481 init_idle_bootup_task(current);
5bfb5d69 482 preempt_enable_no_resched();
f340c0d1 483 schedule();
5bfb5d69 484 preempt_disable();
f340c0d1 485
5bfb5d69 486 /* Call into cpu_idle with preempt disabled */
1da177e4 487 cpu_idle();
1df21055 488}
1da177e4
LT
489
490/* Check for early params. */
491static int __init do_early_param(char *param, char *val)
492{
493 struct obs_kernel_param *p;
494
495 for (p = __setup_start; p < __setup_end; p++) {
18a8bd94
YL
496 if ((p->early && strcmp(param, p->str) == 0) ||
497 (strcmp(param, "console") == 0 &&
498 strcmp(p->str, "earlycon") == 0)
499 ) {
1da177e4
LT
500 if (p->setup_func(val) != 0)
501 printk(KERN_WARNING
502 "Malformed early option '%s'\n", param);
503 }
504 }
505 /* We accept everything at this stage. */
506 return 0;
507}
508
509/* Arch code calls this early on, or if not, just before other parsing. */
510void __init parse_early_param(void)
511{
512 static __initdata int done = 0;
513 static __initdata char tmp_cmdline[COMMAND_LINE_SIZE];
514
515 if (done)
516 return;
517
518 /* All fall through to do_early_param. */
30d7e0d4 519 strlcpy(tmp_cmdline, boot_command_line, COMMAND_LINE_SIZE);
1da177e4
LT
520 parse_args("early options", tmp_cmdline, NULL, 0, do_early_param);
521 done = 1;
522}
523
524/*
525 * Activate the first processor.
526 */
527
44fd2299
SS
528static void __init boot_cpu_init(void)
529{
530 int cpu = smp_processor_id();
531 /* Mark the boot cpu "present", "online" etc for SMP and UP case */
532 cpu_set(cpu, cpu_online_map);
533 cpu_set(cpu, cpu_present_map);
534 cpu_set(cpu, cpu_possible_map);
535}
536
839ad62e 537void __init __weak smp_setup_processor_id(void)
033ab7f8
AM
538{
539}
540
8c9843e5
BH
541void __init __weak thread_info_cache_init(void)
542{
543}
544
1da177e4
LT
545asmlinkage void __init start_kernel(void)
546{
547 char * command_line;
548 extern struct kernel_param __start___param[], __stop___param[];
033ab7f8
AM
549
550 smp_setup_processor_id();
551
fbb9ce95
IM
552 /*
553 * Need to run as early as possible, to initialize the
554 * lockdep hash:
555 */
c9538ed4 556 unwind_init();
fbb9ce95 557 lockdep_init();
3ac7fe5a 558 debug_objects_early_init();
ddbcc7e8 559 cgroup_init_early();
fbb9ce95
IM
560
561 local_irq_disable();
562 early_boot_irqs_off();
243c7621 563 early_init_irq_lock_class();
fbb9ce95 564
1da177e4
LT
565/*
566 * Interrupts are still disabled. Do necessary setups, then
567 * enable them
568 */
569 lock_kernel();
906568c9 570 tick_init();
44fd2299 571 boot_cpu_init();
1da177e4
LT
572 page_address_init();
573 printk(KERN_NOTICE);
8993780a 574 printk(linux_banner);
1da177e4 575 setup_arch(&command_line);
3ddfda11 576 pre_alloc_dyn_array();
cf475ad2 577 mm_init_owner(&init_mm, &init_task);
30d7e0d4 578 setup_command_line(command_line);
690a973f 579 unwind_setup();
1da177e4 580 setup_per_cpu_areas();
e0982e90 581 setup_nr_cpu_ids();
44fd2299 582 smp_prepare_boot_cpu(); /* arch-specific boot-cpu hooks */
1da177e4
LT
583
584 /*
585 * Set up the scheduler prior starting any interrupts (such as the
586 * timer interrupt). Full topology setup happens at smp_init()
587 * time - but meanwhile we still have a functioning scheduler.
588 */
589 sched_init();
590 /*
591 * Disable preemption - early bootup scheduling is extremely
592 * fragile until we cpu_idle() for the first time.
593 */
594 preempt_disable();
595 build_all_zonelists();
596 page_alloc_init();
30d7e0d4 597 printk(KERN_NOTICE "Kernel command line: %s\n", boot_command_line);
1da177e4 598 parse_early_param();
30d7e0d4 599 parse_args("Booting kernel", static_command_line, __start___param,
1da177e4
LT
600 __stop___param - __start___param,
601 &unknown_bootoption);
c4a68306
AB
602 if (!irqs_disabled()) {
603 printk(KERN_WARNING "start_kernel(): bug: interrupts were "
604 "enabled *very* early, fixing it\n");
605 local_irq_disable();
606 }
1da177e4
LT
607 sort_main_extable();
608 trap_init();
609 rcu_init();
610 init_IRQ();
611 pidhash_init();
612 init_timers();
c0a31329 613 hrtimers_init();
1da177e4 614 softirq_init();
ad596171 615 timekeeping_init();
88fecaa2 616 time_init();
3e51f33f 617 sched_clock_init();
93e02814
HC
618 profile_init();
619 if (!irqs_disabled())
620 printk("start_kernel(): bug: interrupts were enabled early\n");
fbb9ce95 621 early_boot_irqs_on();
93e02814 622 local_irq_enable();
1da177e4
LT
623
624 /*
625 * HACK ALERT! This is early. We're enabling the console before
626 * we've done PCI setups etc, and console_init() must be aware of
627 * this. But we do want output early, in case something goes wrong.
628 */
629 console_init();
630 if (panic_later)
631 panic(panic_later, panic_param);
fbb9ce95
IM
632
633 lockdep_info();
634
9a11b49a
IM
635 /*
636 * Need to run this when irqs are enabled, because it wants
637 * to self-test [hard/soft]-irqs on/off lock inversion bugs
638 * too:
639 */
640 locking_selftest();
641
1da177e4
LT
642#ifdef CONFIG_BLK_DEV_INITRD
643 if (initrd_start && !initrd_below_start_ok &&
bd673c7c 644 page_to_pfn(virt_to_page((void *)initrd_start)) < min_low_pfn) {
1da177e4 645 printk(KERN_CRIT "initrd overwritten (0x%08lx < 0x%08lx) - "
fb6624eb 646 "disabling it.\n",
bd673c7c
GU
647 page_to_pfn(virt_to_page((void *)initrd_start)),
648 min_low_pfn);
1da177e4
LT
649 initrd_start = 0;
650 }
651#endif
652 vfs_caches_init_early();
c417f024 653 cpuset_init_early();
1da177e4 654 mem_init();
a03c2a48 655 enable_debug_pagealloc();
d221938c 656 cpu_hotplug_init();
1da177e4 657 kmem_cache_init();
3ac7fe5a 658 debug_objects_mem_init();
199f0ca5 659 idr_init_cache();
e7c8d5c9 660 setup_per_cpu_pageset();
1da177e4
LT
661 numa_policy_init();
662 if (late_time_init)
663 late_time_init();
664 calibrate_delay();
665 pidmap_init();
666 pgtable_cache_init();
667 prio_tree_init();
668 anon_vma_init();
669#ifdef CONFIG_X86
670 if (efi_enabled)
671 efi_enter_virtual_mode();
672#endif
8c9843e5 673 thread_info_cache_init();
1da177e4
LT
674 fork_init(num_physpages);
675 proc_caches_init();
676 buffer_init();
677 unnamed_dev_init();
678 key_init();
679 security_init();
680 vfs_caches_init(num_physpages);
681 radix_tree_init();
682 signals_init();
683 /* rootfs populating might need page-writeback */
684 page_writeback_init();
685#ifdef CONFIG_PROC_FS
686 proc_root_init();
687#endif
ddbcc7e8 688 cgroup_init();
1da177e4 689 cpuset_init();
c757249a 690 taskstats_init_early();
ca74e92b 691 delayacct_init();
1da177e4
LT
692
693 check_bugs();
694
695 acpi_early_init(); /* before LAPIC and SMP init */
696
697 /* Do the rest non-__init'ed, we're now alive */
698 rest_init();
699}
700
59f9415f 701static int initcall_debug;
1da177e4
LT
702
703static int __init initcall_debug_setup(char *str)
704{
705 initcall_debug = 1;
706 return 1;
707}
708__setup("initcall_debug", initcall_debug_setup);
709
59f9415f 710int do_one_initcall(initcall_t fn)
1da177e4 711{
1da177e4 712 int count = preempt_count();
e0df154f 713 ktime_t t0, t1, delta;
a76bfd0d 714 char msgbuf[64];
e0df154f 715 int result;
1da177e4 716
e0df154f 717 if (initcall_debug) {
f9b9796a 718 printk("calling %pF @ %i\n", fn, task_pid_nr(current));
e0df154f
LT
719 t0 = ktime_get();
720 }
1da177e4 721
e0df154f 722 result = fn();
1da177e4 723
e0df154f
LT
724 if (initcall_debug) {
725 t1 = ktime_get();
726 delta = ktime_sub(t1, t0);
8f0c45cd 727
96d746c6
LT
728 printk("initcall %pF returned %d after %Ld msecs\n",
729 fn, result,
e0df154f
LT
730 (unsigned long long) delta.tv64 >> 20);
731 }
8f0c45cd 732
e0df154f 733 msgbuf[0] = 0;
e662e1cf 734
e0df154f
LT
735 if (result && result != -ENODEV && initcall_debug)
736 sprintf(msgbuf, "error code %d ", result);
e662e1cf 737
e0df154f 738 if (preempt_count() != count) {
a76bfd0d 739 strlcat(msgbuf, "preemption imbalance ", sizeof(msgbuf));
e0df154f 740 preempt_count() = count;
1da177e4 741 }
e0df154f 742 if (irqs_disabled()) {
a76bfd0d 743 strlcat(msgbuf, "disabled interrupts ", sizeof(msgbuf));
e0df154f
LT
744 local_irq_enable();
745 }
746 if (msgbuf[0]) {
96d746c6 747 printk("initcall %pF returned with %s\n", fn, msgbuf);
e0df154f 748 }
59f9415f
AV
749
750 return result;
e0df154f
LT
751}
752
753
c2147a50 754extern initcall_t __initcall_start[], __initcall_end[], __early_initcall_end[];
e0df154f
LT
755
756static void __init do_initcalls(void)
757{
758 initcall_t *call;
759
c2147a50 760 for (call = __early_initcall_end; call < __initcall_end; call++)
e0df154f 761 do_one_initcall(*call);
1da177e4
LT
762
763 /* Make sure there is no pending stuff from the initcall sequence */
764 flush_scheduled_work();
765}
766
767/*
768 * Ok, the machine is now initialized. None of the devices
769 * have been touched yet, but the CPU subsystem is up and
770 * running, and memory and process management works.
771 *
772 * Now we can finally start doing some real work..
773 */
774static void __init do_basic_setup(void)
775{
4446a36f 776 rcu_init_sched(); /* needed by module_init stage. */
1da177e4
LT
777 /* drivers will send hotplug events */
778 init_workqueues();
779 usermodehelper_init();
780 driver_init();
b04c3afb 781 init_irq_proc();
1da177e4
LT
782 do_initcalls();
783}
784
7babe8db 785static void __init do_pre_smp_initcalls(void)
c2147a50
EGM
786{
787 initcall_t *call;
788
789 for (call = __initcall_start; call < __early_initcall_end; call++)
790 do_one_initcall(*call);
791}
792
1da177e4
LT
793static void run_init_process(char *init_filename)
794{
795 argv_init[0] = init_filename;
67608567 796 kernel_execve(init_filename, argv_init, envp_init);
1da177e4
LT
797}
798
ee5bfa64
VG
799/* This is a non __init function. Force it to be noinline otherwise gcc
800 * makes it inline to init() and it becomes part of init.text section
801 */
802static int noinline init_post(void)
803{
804 free_initmem();
805 unlock_kernel();
806 mark_rodata_ro();
807 system_state = SYSTEM_RUNNING;
808 numa_default_policy();
809
810 if (sys_open((const char __user *) "/dev/console", O_RDWR, 0) < 0)
811 printk(KERN_WARNING "Warning: unable to open an initial console.\n");
812
813 (void) sys_dup(0);
814 (void) sys_dup(0);
815
fae5fa44
ON
816 current->signal->flags |= SIGNAL_UNKILLABLE;
817
ee5bfa64
VG
818 if (ramdisk_execute_command) {
819 run_init_process(ramdisk_execute_command);
820 printk(KERN_WARNING "Failed to execute %s\n",
821 ramdisk_execute_command);
822 }
823
824 /*
825 * We try each of these until one succeeds.
826 *
827 * The Bourne shell can be used instead of init if we are
828 * trying to recover a really broken machine.
829 */
830 if (execute_command) {
831 run_init_process(execute_command);
832 printk(KERN_WARNING "Failed to execute %s. Attempting "
833 "defaults...\n", execute_command);
834 }
835 run_init_process("/sbin/init");
836 run_init_process("/etc/init");
837 run_init_process("/bin/init");
838 run_init_process("/bin/sh");
839
840 panic("No init found. Try passing init= option to kernel.");
841}
842
aae5f662 843static int __init kernel_init(void * unused)
1da177e4
LT
844{
845 lock_kernel();
846 /*
847 * init can run on any cpu.
848 */
321a8e9d 849 set_cpus_allowed_ptr(current, CPU_MASK_ALL_PTR);
1da177e4
LT
850 /*
851 * Tell the world that we're going to be the grim
852 * reaper of innocent orphaned children.
853 *
854 * We don't want people to have to make incorrect
855 * assumptions about where in the task array this
856 * can be found.
857 */
84d73786 858 init_pid_ns.child_reaper = current;
1da177e4 859
9ec52099
CLG
860 cad_pid = task_pid(current);
861
ca74a6f8 862 smp_prepare_cpus(setup_max_cpus);
1da177e4
LT
863
864 do_pre_smp_initcalls();
865
1da177e4
LT
866 smp_init();
867 sched_init_smp();
868
869 cpuset_init_smp();
870
1da177e4
LT
871 do_basic_setup();
872
873 /*
874 * check if there is an early userspace init. If yes, let it do all
875 * the work
876 */
ffdfc409
OJ
877
878 if (!ramdisk_execute_command)
879 ramdisk_execute_command = "/init";
880
881 if (sys_access((const char __user *) ramdisk_execute_command, 0) != 0) {
882 ramdisk_execute_command = NULL;
1da177e4 883 prepare_namespace();
ffdfc409 884 }
1da177e4
LT
885
886 /*
887 * Ok, we have completed the initial bootup, and
888 * we're essentially up and running. Get rid of the
889 * initmem segments and start the user-mode stuff..
890 */
ee5bfa64
VG
891 init_post();
892 return 0;
1da177e4 893}
This page took 0.408639 seconds and 5 git commands to generate.