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
12 #define __KERNEL_SYSCALLS__
13
14 #include <linux/config.h>
15 #include <linux/proc_fs.h>
16 #include <linux/devfs_fs_kernel.h>
17 #include <linux/unistd.h>
18 #include <linux/string.h>
19 #include <linux/ctype.h>
20 #include <linux/delay.h>
21 #include <linux/utsname.h>
22 #include <linux/ioport.h>
23 #include <linux/init.h>
24 #include <linux/raid/md.h>
25 #include <linux/smp_lock.h>
26 #include <linux/blk.h>
27 #include <linux/hdreg.h>
28 #include <linux/iobuf.h>
29 #include <linux/bootmem.h>
30
31 #include <asm/io.h>
32 #include <asm/bugs.h>
33
34 #ifdef CONFIG_PCI
35 #include <linux/pci.h>
36 #endif
37
38 #ifdef CONFIG_DIO
39 #include <linux/dio.h>
40 #endif
41
42 #ifdef CONFIG_ZORRO
43 #include <linux/zorro.h>
44 #endif
45
46 #ifdef CONFIG_MTRR
47 # include <asm/mtrr.h>
48 #endif
49
50 #ifdef CONFIG_3215_CONSOLE
51 extern int con3215_activate(void);
52 #endif
53
54 #ifdef CONFIG_NUBUS
55 #include <linux/nubus.h>
56 #endif
57
58 #ifdef CONFIG_ISAPNP
59 #include <linux/isapnp.h>
60 #endif
61
62 #ifdef CONFIG_IRDA
63 #include <net/irda/irda_device.h>
64 #endif
65
66 #ifdef CONFIG_X86_IO_APIC
67 #include <asm/smp.h>
68 #endif
69
70 /*
71 * Versions of gcc older than that listed below may actually compile
72 * and link okay, but the end product can have subtle run time bugs.
73 * To avoid associated bogus bug reports, we flatly refuse to compile
74 * with a gcc that is known to be too old from the very beginning.
75 */
76 #if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 91)
77 #error Sorry, your GCC is too old. It builds incorrect kernels.
78 #endif
79
80 extern char _stext, _etext;
81 extern char *linux_banner;
82
83 static int init(void *);
84
85 extern void init_IRQ(void);
86 extern void init_modules(void);
87 extern void sock_init(void);
88 extern void fork_init(unsigned long);
89 extern void mca_init(void);
90 extern void sbus_init(void);
91 extern void ppc_init(void);
92 extern void sysctl_init(void);
93 extern void signals_init(void);
94 extern void bdev_init(void);
95 extern int init_pcmcia_ds(void);
96 extern void net_notifier_init(void);
97
98 extern void free_initmem(void);
99 extern void filesystem_setup(void);
100
101 #ifdef CONFIG_TC
102 extern void tc_init(void);
103 #endif
104
105 extern void ecard_init(void);
106
107 #if defined(CONFIG_SYSVIPC)
108 extern void ipc_init(void);
109 #endif
110 #if defined(CONFIG_QUOTA)
111 extern void dquot_init_hash(void);
112 #endif
113
114 /*
115 * Boot command-line arguments
116 */
117 #define MAX_INIT_ARGS 8
118 #define MAX_INIT_ENVS 8
119
120 extern void time_init(void);
121 extern void softirq_init(void);
122
123 int rows, cols;
124
125 #ifdef CONFIG_BLK_DEV_INITRD
126 kdev_t real_root_dev;
127 #endif
128
129 int root_mountflags = MS_RDONLY;
130 char *execute_command;
131 char root_device_name[64];
132
133
134 static char * argv_init[MAX_INIT_ARGS+2] = { "init", NULL, };
135 static char * envp_init[MAX_INIT_ENVS+2] = { "HOME=/", "TERM=linux", NULL, };
136
137 static int __init profile_setup(char *str)
138 {
139 int par;
140 if (get_option(&str,&par)) prof_shift = par;
141 return 1;
142 }
143
144 __setup("profile=", profile_setup);
145
146
147 static struct dev_name_struct {
148 const char *name;
149 const int num;
150 } root_dev_names[] __initdata = {
151 { "nfs", 0x00ff },
152 { "hda", 0x0300 },
153 { "hdb", 0x0340 },
154 { "hdc", 0x1600 },
155 { "hdd", 0x1640 },
156 { "hde", 0x2100 },
157 { "hdf", 0x2140 },
158 { "hdg", 0x2200 },
159 { "hdh", 0x2240 },
160 { "hdi", 0x3800 },
161 { "hdj", 0x3840 },
162 { "hdk", 0x3900 },
163 { "hdl", 0x3940 },
164 { "hdm", 0x5800 },
165 { "hdn", 0x5840 },
166 { "hdo", 0x5900 },
167 { "hdp", 0x5940 },
168 { "hdq", 0x5A00 },
169 { "hdr", 0x5A40 },
170 { "hds", 0x5B00 },
171 { "hdt", 0x5B40 },
172 { "sda", 0x0800 },
173 { "sdb", 0x0810 },
174 { "sdc", 0x0820 },
175 { "sdd", 0x0830 },
176 { "sde", 0x0840 },
177 { "sdf", 0x0850 },
178 { "sdg", 0x0860 },
179 { "sdh", 0x0870 },
180 { "sdi", 0x0880 },
181 { "sdj", 0x0890 },
182 { "sdk", 0x08a0 },
183 { "sdl", 0x08b0 },
184 { "sdm", 0x08c0 },
185 { "sdn", 0x08d0 },
186 { "sdo", 0x08e0 },
187 { "sdp", 0x08f0 },
188 { "ada", 0x1c00 },
189 { "adb", 0x1c10 },
190 { "adc", 0x1c20 },
191 { "add", 0x1c30 },
192 { "ade", 0x1c40 },
193 { "fd", 0x0200 },
194 { "md", 0x0900 },
195 { "xda", 0x0d00 },
196 { "xdb", 0x0d40 },
197 { "ram", 0x0100 },
198 { "scd", 0x0b00 },
199 { "mcd", 0x1700 },
200 { "cdu535", 0x1800 },
201 { "sonycd", 0x1800 },
202 { "aztcd", 0x1d00 },
203 { "cm206cd", 0x2000 },
204 { "gscd", 0x1000 },
205 { "sbpcd", 0x1900 },
206 { "eda", 0x2400 },
207 { "edb", 0x2440 },
208 { "pda", 0x2d00 },
209 { "pdb", 0x2d10 },
210 { "pdc", 0x2d20 },
211 { "pdd", 0x2d30 },
212 { "pcd", 0x2e00 },
213 { "pf", 0x2f00 },
214 { "apblock", APBLOCK_MAJOR << 8},
215 { "ddv", DDV_MAJOR << 8},
216 { "jsfd", JSFD_MAJOR << 8},
217 #ifdef CONFIG_MDISK
218 { "mnda", (MDISK_MAJOR << MINORBITS)},
219 { "mndb", (MDISK_MAJOR << MINORBITS) + 1},
220 { "mndc", (MDISK_MAJOR << MINORBITS) + 2},
221 { "mndd", (MDISK_MAJOR << MINORBITS) + 3},
222 { "mnde", (MDISK_MAJOR << MINORBITS) + 4},
223 { "mndf", (MDISK_MAJOR << MINORBITS) + 5},
224 { "mndg", (MDISK_MAJOR << MINORBITS) + 6},
225 { "mndh", (MDISK_MAJOR << MINORBITS) + 7},
226 #endif
227 #ifdef CONFIG_DASD
228 { "dasda", (DASD_MAJOR << MINORBITS) },
229 { "dasdb", (DASD_MAJOR << MINORBITS) + (1 << 2) },
230 { "dasdc", (DASD_MAJOR << MINORBITS) + (2 << 2) },
231 { "dasdd", (DASD_MAJOR << MINORBITS) + (3 << 2) },
232 { "dasde", (DASD_MAJOR << MINORBITS) + (4 << 2) },
233 { "dasdf", (DASD_MAJOR << MINORBITS) + (5 << 2) },
234 { "dasdg", (DASD_MAJOR << MINORBITS) + (6 << 2) },
235 { "dasdh", (DASD_MAJOR << MINORBITS) + (7 << 2) },
236 #endif
237 #if defined(CONFIG_BLK_CPQ_DA) || defined(CONFIG_BLK_CPQ_DA_MODULE)
238 { "ida/c0d0p",0x4800 },
239 { "ida/c0d1p",0x4810 },
240 { "ida/c0d2p",0x4820 },
241 { "ida/c0d3p",0x4830 },
242 { "ida/c0d4p",0x4840 },
243 { "ida/c0d5p",0x4850 },
244 { "ida/c0d6p",0x4860 },
245 { "ida/c0d7p",0x4870 },
246 { "ida/c0d8p",0x4880 },
247 { "ida/c0d9p",0x4890 },
248 { "ida/c0d10p",0x48A0 },
249 { "ida/c0d11p",0x48B0 },
250 { "ida/c0d12p",0x48C0 },
251 { "ida/c0d13p",0x48D0 },
252 { "ida/c0d14p",0x48E0 },
253 { "ida/c0d15p",0x48F0 },
254 #endif
255 #if defined(CONFIG_BLK_CPQ_CISS_DA) || defined(CONFIG_BLK_CPQ_CISS_DA_MODULE)
256 { "cciss/c0d0p",0x6800 },
257 { "cciss/c0d1p",0x6810 },
258 { "cciss/c0d2p",0x6820 },
259 { "cciss/c0d3p",0x6830 },
260 { "cciss/c0d4p",0x6840 },
261 { "cciss/c0d5p",0x6850 },
262 { "cciss/c0d6p",0x6860 },
263 { "cciss/c0d7p",0x6870 },
264 { "cciss/c0d8p",0x6880 },
265 { "cciss/c0d9p",0x6890 },
266 { "cciss/c0d10p",0x68A0 },
267 { "cciss/c0d11p",0x68B0 },
268 { "cciss/c0d12p",0x68C0 },
269 { "cciss/c0d13p",0x68D0 },
270 { "cciss/c0d14p",0x68E0 },
271 { "cciss/c0d15p",0x68F0 },
272 #endif
273 #ifdef CONFIG_NFTL
274 { "nftla", 0x5d00 },
275 #endif
276 { NULL, 0 }
277 };
278
279 kdev_t __init name_to_kdev_t(char *line)
280 {
281 int base = 0;
282
283 if (strncmp(line,"/dev/",5) == 0) {
284 struct dev_name_struct *dev = root_dev_names;
285 line += 5;
286 do {
287 int len = strlen(dev->name);
288 if (strncmp(line,dev->name,len) == 0) {
289 line += len;
290 base = dev->num;
291 break;
292 }
293 dev++;
294 } while (dev->name);
295 }
296 return to_kdev_t(base + simple_strtoul(line,NULL,base?10:16));
297 }
298
299 static int __init root_dev_setup(char *line)
300 {
301 int i;
302 char ch;
303
304 ROOT_DEV = name_to_kdev_t(line);
305 memset (root_device_name, 0, sizeof root_device_name);
306 if (strncmp (line, "/dev/", 5) == 0) line += 5;
307 for (i = 0; i < sizeof root_device_name - 1; ++i)
308 {
309 ch = line[i];
310 if ( isspace (ch) || (ch == ',') || (ch == '\0') ) break;
311 root_device_name[i] = ch;
312 }
313 return 1;
314 }
315
316 __setup("root=", root_dev_setup);
317
318 static int __init checksetup(char *line)
319 {
320 struct kernel_param *p;
321
322 p = &__setup_start;
323 do {
324 int n = strlen(p->str);
325 if (!strncmp(line,p->str,n)) {
326 if (p->setup_func(line+n))
327 return 1;
328 }
329 p++;
330 } while (p < &__setup_end);
331 return 0;
332 }
333
334 /* this should be approx 2 Bo*oMips to start (note initial shift), and will
335 still work even if initially too large, it will just take slightly longer */
336 unsigned long loops_per_jiffy = (1<<12);
337
338 /* This is the number of bits of precision for the loops_per_jiffy. Each
339 bit takes on average 1.5/HZ seconds. This (like the original) is a little
340 better than 1% */
341 #define LPS_PREC 8
342
343 void __init calibrate_delay(void)
344 {
345 unsigned long ticks, loopbit;
346 int lps_precision = LPS_PREC;
347
348 loops_per_jiffy = (1<<12);
349
350 printk("Calibrating delay loop... ");
351 while (loops_per_jiffy <<= 1) {
352 /* wait for "start of" clock tick */
353 ticks = jiffies;
354 while (ticks == jiffies)
355 /* nothing */;
356 /* Go .. */
357 ticks = jiffies;
358 __delay(loops_per_jiffy);
359 ticks = jiffies - ticks;
360 if (ticks)
361 break;
362 }
363
364 /* Do a binary approximation to get loops_per_jiffy set to equal one clock
365 (up to lps_precision bits) */
366 loops_per_jiffy >>= 1;
367 loopbit = loops_per_jiffy;
368 while ( lps_precision-- && (loopbit >>= 1) ) {
369 loops_per_jiffy |= loopbit;
370 ticks = jiffies;
371 while (ticks == jiffies);
372 ticks = jiffies;
373 __delay(loops_per_jiffy);
374 if (jiffies != ticks) /* longer than 1 tick */
375 loops_per_jiffy &= ~loopbit;
376 }
377
378 /* Round the value and print it */
379 printk("%lu.%02lu BogoMIPS\n",
380 loops_per_jiffy/(500000/HZ),
381 (loops_per_jiffy/(5000/HZ)) % 100);
382 }
383
384 static int __init readonly(char *str)
385 {
386 if (*str)
387 return 0;
388 root_mountflags |= MS_RDONLY;
389 return 1;
390 }
391
392 static int __init readwrite(char *str)
393 {
394 if (*str)
395 return 0;
396 root_mountflags &= ~MS_RDONLY;
397 return 1;
398 }
399
400 static int __init debug_kernel(char *str)
401 {
402 if (*str)
403 return 0;
404 console_loglevel = 10;
405 return 1;
406 }
407
408 static int __init quiet_kernel(char *str)
409 {
410 if (*str)
411 return 0;
412 console_loglevel = 4;
413 return 1;
414 }
415
416 __setup("ro", readonly);
417 __setup("rw", readwrite);
418 __setup("debug", debug_kernel);
419 __setup("quiet", quiet_kernel);
420
421 /*
422 * This is a simple kernel command line parsing function: it parses
423 * the command line, and fills in the arguments/environment to init
424 * as appropriate. Any cmd-line option is taken to be an environment
425 * variable if it contains the character '='.
426 *
427 * This routine also checks for options meant for the kernel.
428 * These options are not given to init - they are for internal kernel use only.
429 */
430 static void __init parse_options(char *line)
431 {
432 char *next,*quote;
433 int args, envs;
434
435 if (!*line)
436 return;
437 args = 0;
438 envs = 1; /* TERM is set to 'linux' by default */
439 next = line;
440 while ((line = next) != NULL) {
441 quote = strchr(line,'"');
442 next = strchr(line, ' ');
443 while (next != NULL && quote != NULL && quote < next) {
444 /* we found a left quote before the next blank
445 * now we have to find the matching right quote
446 */
447 next = strchr(quote+1, '"');
448 if (next != NULL) {
449 quote = strchr(next+1, '"');
450 next = strchr(next+1, ' ');
451 }
452 }
453 if (next != NULL)
454 *next++ = 0;
455 if (!strncmp(line,"init=",5)) {
456 line += 5;
457 execute_command = line;
458 /* In case LILO is going to boot us with default command line,
459 * it prepends "auto" before the whole cmdline which makes
460 * the shell think it should execute a script with such name.
461 * So we ignore all arguments entered _before_ init=... [MJ]
462 */
463 args = 0;
464 continue;
465 }
466 if (checksetup(line))
467 continue;
468
469 /*
470 * Then check if it's an environment variable or
471 * an option.
472 */
473 if (strchr(line,'=')) {
474 if (envs >= MAX_INIT_ENVS)
475 break;
476 envp_init[++envs] = line;
477 } else {
478 if (args >= MAX_INIT_ARGS)
479 break;
480 if (*line)
481 argv_init[++args] = line;
482 }
483 }
484 argv_init[args+1] = NULL;
485 envp_init[envs+1] = NULL;
486 }
487
488
489 extern void setup_arch(char **);
490 extern void cpu_idle(void);
491
492 #ifndef CONFIG_SMP
493
494 #ifdef CONFIG_X86_IO_APIC
495 static void __init smp_init(void)
496 {
497 IO_APIC_init_uniprocessor();
498 }
499 #else
500 #define smp_init() do { } while (0)
501 #endif
502
503 #else
504
505 /* Called by boot processor to activate the rest. */
506 static void __init smp_init(void)
507 {
508 /* Get other processors into their bootup holding patterns. */
509 smp_boot_cpus();
510 smp_threads_ready=1;
511 smp_commence();
512 }
513
514 #endif
515
516 /*
517 * Activate the first processor.
518 */
519
520 asmlinkage void __init start_kernel(void)
521 {
522 char * command_line;
523 unsigned long mempages;
524 extern char saved_command_line[];
525 /*
526 * Interrupts are still disabled. Do necessary setups, then
527 * enable them
528 */
529 lock_kernel();
530 printk(linux_banner);
531 setup_arch(&command_line);
532 printk("Kernel command line: %s\n", saved_command_line);
533 parse_options(command_line);
534 trap_init();
535 init_IRQ();
536 sched_init();
537 time_init();
538 softirq_init();
539
540 /*
541 * HACK ALERT! This is early. We're enabling the console before
542 * we've done PCI setups etc, and console_init() must be aware of
543 * this. But we do want output early, in case something goes wrong.
544 */
545 console_init();
546 #ifdef CONFIG_MODULES
547 init_modules();
548 #endif
549 if (prof_shift) {
550 unsigned int size;
551 /* only text is profiled */
552 prof_len = (unsigned long) &_etext - (unsigned long) &_stext;
553 prof_len >>= prof_shift;
554
555 size = prof_len * sizeof(unsigned int) + PAGE_SIZE-1;
556 prof_buffer = (unsigned int *) alloc_bootmem(size);
557 }
558
559 kmem_cache_init();
560 sti();
561 calibrate_delay();
562 #ifdef CONFIG_BLK_DEV_INITRD
563 if (initrd_start && !initrd_below_start_ok &&
564 initrd_start < min_low_pfn << PAGE_SHIFT) {
565 printk(KERN_CRIT "initrd overwritten (0x%08lx < 0x%08lx) - "
566 "disabling it.\n",initrd_start,min_low_pfn << PAGE_SHIFT);
567 initrd_start = 0;
568 }
569 #endif
570 mem_init();
571 kmem_cache_sizes_init();
572 #ifdef CONFIG_3215_CONSOLE
573 con3215_activate();
574 #endif
575 #ifdef CONFIG_PROC_FS
576 proc_root_init();
577 #endif
578 mempages = num_physpages;
579
580 fork_init(mempages);
581 proc_caches_init();
582 vfs_caches_init(mempages);
583 buffer_init(mempages);
584 page_cache_init(mempages);
585 kiobuf_setup();
586 signals_init();
587 bdev_init();
588 inode_init(mempages);
589 #if defined(CONFIG_SYSVIPC)
590 ipc_init();
591 #endif
592 #if defined(CONFIG_QUOTA)
593 dquot_init_hash();
594 #endif
595 check_bugs();
596 printk("POSIX conformance testing by UNIFIX\n");
597
598 /*
599 * We count on the initial thread going ok
600 * Like idlers init is an unlocked kernel thread, which will
601 * make syscalls (and thus be locked).
602 */
603 smp_init();
604 kernel_thread(init, NULL, CLONE_FS | CLONE_FILES | CLONE_SIGNAL);
605 unlock_kernel();
606 current->need_resched = 1;
607 cpu_idle();
608 }
609
610 #ifdef CONFIG_BLK_DEV_INITRD
611 static int do_linuxrc(void * shell)
612 {
613 static char *argv[] = { "linuxrc", NULL, };
614
615 close(0);close(1);close(2);
616 setsid();
617 (void) open("/dev/console",O_RDWR,0);
618 (void) dup(0);
619 (void) dup(0);
620 return execve(shell, argv, envp_init);
621 }
622
623 #endif
624
625 struct task_struct *child_reaper = &init_task;
626
627 static void __init do_initcalls(void)
628 {
629 initcall_t *call;
630
631 call = &__initcall_start;
632 do {
633 (*call)();
634 call++;
635 } while (call < &__initcall_end);
636
637 /* Make sure there is no pending stuff from the initcall sequence */
638 flush_scheduled_tasks();
639 }
640
641 /*
642 * Ok, the machine is now initialized. None of the devices
643 * have been touched yet, but the CPU subsystem is up and
644 * running, and memory and process management works.
645 *
646 * Now we can finally start doing some real work..
647 */
648 static void __init do_basic_setup(void)
649 {
650 #ifdef CONFIG_BLK_DEV_INITRD
651 int real_root_mountflags;
652 #endif
653
654 /*
655 * Tell the world that we're going to be the grim
656 * reaper of innocent orphaned children.
657 *
658 * We don't want people to have to make incorrect
659 * assumptions about where in the task array this
660 * can be found.
661 */
662 child_reaper = current;
663
664 #if defined(CONFIG_MTRR) /* Do this after SMP initialization */
665 /*
666 * We should probably create some architecture-dependent "fixup after
667 * everything is up" style function where this would belong better
668 * than in init/main.c..
669 */
670 mtrr_init();
671 #endif
672
673 #ifdef CONFIG_SYSCTL
674 sysctl_init();
675 #endif
676
677 /*
678 * Ok, at this point all CPU's should be initialized, so
679 * we can start looking into devices..
680 */
681 #ifdef CONFIG_PCI
682 pci_init();
683 #endif
684 #ifdef CONFIG_SBUS
685 sbus_init();
686 #endif
687 #if defined(CONFIG_PPC)
688 ppc_init();
689 #endif
690 #ifdef CONFIG_MCA
691 mca_init();
692 #endif
693 #ifdef CONFIG_ARCH_ACORN
694 ecard_init();
695 #endif
696 #ifdef CONFIG_ZORRO
697 zorro_init();
698 #endif
699 #ifdef CONFIG_DIO
700 dio_init();
701 #endif
702 #ifdef CONFIG_NUBUS
703 nubus_init();
704 #endif
705 #ifdef CONFIG_ISAPNP
706 isapnp_init();
707 #endif
708 #ifdef CONFIG_TC
709 tc_init();
710 #endif
711
712 /* Networking initialization needs a process context */
713 sock_init();
714
715 #ifdef CONFIG_BLK_DEV_INITRD
716 real_root_dev = ROOT_DEV;
717 real_root_mountflags = root_mountflags;
718 if (initrd_start && mount_initrd) root_mountflags &= ~MS_RDONLY;
719 else mount_initrd =0;
720 #endif
721
722 start_context_thread();
723 do_initcalls();
724
725 /* .. filesystems .. */
726 filesystem_setup();
727
728 #ifdef CONFIG_IRDA
729 irda_device_init(); /* Must be done after protocol initialization */
730 #endif
731 #ifdef CONFIG_PCMCIA
732 init_pcmcia_ds(); /* Do this last */
733 #endif
734
735 /* Mount the root filesystem.. */
736 mount_root();
737
738 mount_devfs_fs ();
739
740 #ifdef CONFIG_BLK_DEV_INITRD
741 root_mountflags = real_root_mountflags;
742 if (mount_initrd && ROOT_DEV != real_root_dev
743 && MAJOR(ROOT_DEV) == RAMDISK_MAJOR && MINOR(ROOT_DEV) == 0) {
744 int error;
745 int i, pid;
746
747 pid = kernel_thread(do_linuxrc, "/linuxrc", SIGCHLD);
748 if (pid>0)
749 while (pid != wait(&i));
750 if (MAJOR(real_root_dev) != RAMDISK_MAJOR
751 || MINOR(real_root_dev) != 0) {
752 error = change_root(real_root_dev,"/initrd");
753 if (error)
754 printk(KERN_ERR "Change root to /initrd: "
755 "error %d\n",error);
756 }
757 }
758 #endif
759 }
760
761 static int init(void * unused)
762 {
763 lock_kernel();
764 do_basic_setup();
765
766 /*
767 * Ok, we have completed the initial bootup, and
768 * we're essentially up and running. Get rid of the
769 * initmem segments and start the user-mode stuff..
770 */
771 free_initmem();
772 unlock_kernel();
773
774 if (open("/dev/console", O_RDWR, 0) < 0)
775 printk("Warning: unable to open an initial console.\n");
776
777 (void) dup(0);
778 (void) dup(0);
779
780 /*
781 * We try each of these until one succeeds.
782 *
783 * The Bourne shell can be used instead of init if we are
784 * trying to recover a really broken machine.
785 */
786
787 if (execute_command)
788 execve(execute_command,argv_init,envp_init);
789 execve("/sbin/init",argv_init,envp_init);
790 execve("/etc/init",argv_init,envp_init);
791 execve("/bin/init",argv_init,envp_init);
792 execve("/bin/sh",argv_init,envp_init);
793 panic("No init found. Try passing init= option to kernel.");
794 }
795
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