Loading...
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 | /*
* linux/init/main.c
*
* Copyright (C) 1991, 1992 Linus Torvalds
*/
#define __KERNEL_SYSCALLS__
#include <stdarg.h>
#include <asm/system.h>
#include <asm/io.h>
#include <linux/types.h>
#include <linux/fcntl.h>
#include <linux/config.h>
#include <linux/sched.h>
#include <linux/tty.h>
#include <linux/head.h>
#include <linux/unistd.h>
#include <linux/string.h>
#include <linux/timer.h>
#include <linux/fs.h>
#include <linux/ctype.h>
#include <linux/delay.h>
#include <linux/utsname.h>
#include <linux/ioport.h>
#include <linux/hdreg.h>
#include <linux/mm.h>
#include <asm/bugs.h>
extern unsigned long * prof_buffer;
extern unsigned long prof_len;
extern char _stext, _etext;
extern char *linux_banner;
static char printbuf[1024];
extern int console_loglevel;
extern void init(void);
extern void init_IRQ(void);
extern void init_modules(void);
extern long console_init(long, long);
extern long kmalloc_init(long,long);
extern long blk_dev_init(long,long);
extern long chr_dev_init(long,long);
extern void sock_init(void);
extern long rd_init(long mem_start, int length);
unsigned long net_dev_init(unsigned long, unsigned long);
extern long pci_init(long, long);
extern void bmouse_setup(char *str, int *ints);
extern void eth_setup(char *str, int *ints);
extern void xd_setup(char *str, int *ints);
extern void floppy_setup(char *str, int *ints);
extern void st_setup(char *str, int *ints);
extern void st0x_setup(char *str, int *ints);
extern void tmc8xx_setup(char *str, int *ints);
extern void t128_setup(char *str, int *ints);
extern void pas16_setup(char *str, int *ints);
extern void generic_NCR5380_setup(char *str, int *intr);
extern void aha152x_setup(char *str, int *ints);
extern void aha1542_setup(char *str, int *ints);
extern void aic7xxx_setup(char *str, int *ints);
extern void buslogic_setup(char *str, int *ints);
extern void scsi_luns_setup(char *str, int *ints);
extern void sound_setup(char *str, int *ints);
#ifdef CONFIG_CDU31A
extern void cdu31a_setup(char *str, int *ints);
#endif CONFIG_CDU31A
#ifdef CONFIG_MCD
extern void mcd_setup(char *str, int *ints);
#endif CONFIG_MCD
#ifdef CONFIG_MCDX
extern void mcdx_setup(char *str, int *ints);
#endif CONFIG_MCDX
#ifdef CONFIG_SBPCD
extern void sbpcd_setup(char *str, int *ints);
#endif CONFIG_SBPCD
#ifdef CONFIG_AZTCD
extern void aztcd_setup(char *str, int *ints);
#endif CONFIG_AZTCD
#ifdef CONFIG_CDU535
extern void sonycd535_setup(char *str, int *ints);
#endif CONFIG_CDU535
#ifdef CONFIG_GSCD
extern void gscd_setup(char *str, int *ints);
#endif CONFIG_GSCD
#ifdef CONFIG_CM206
extern void cm206_setup(char *str, int *ints);
#endif CONFIG_CM206
#ifdef CONFIG_OPTCD
extern void optcd_setup(char *str, int *ints);
#endif CONFIG_OPTCD
#ifdef CONFIG_SJCD
extern void sjcd_setup(char *str, int *ints);
#endif CONFIG_SJCD
void ramdisk_setup(char *str, int *ints);
#ifdef CONFIG_SYSVIPC
extern void ipc_init(void);
#endif
#ifdef CONFIG_SCSI
extern unsigned long scsi_dev_init(unsigned long, unsigned long);
#endif
/*
* Boot command-line arguments
*/
#define MAX_INIT_ARGS 8
#define MAX_INIT_ENVS 8
extern void time_init(void);
static unsigned long memory_start = 0;
static unsigned long memory_end = 0;
int rows, cols;
int ramdisk_size;
int root_mountflags = 0;
static char * argv_init[MAX_INIT_ARGS+2] = { "init", NULL, };
static char * envp_init[MAX_INIT_ENVS+2] = { "HOME=/", "TERM=linux", NULL, };
static char * argv_rc[] = { "/bin/sh", NULL };
static char * envp_rc[] = { "HOME=/", "TERM=linux", NULL };
static char * argv[] = { "-/bin/sh",NULL };
static char * envp[] = { "HOME=/usr/root", "TERM=linux", NULL };
char *get_options(char *str, int *ints)
{
char *cur = str;
int i=1;
while (cur && isdigit(*cur) && i <= 10) {
ints[i++] = simple_strtoul(cur,NULL,0);
if ((cur = strchr(cur,',')) != NULL)
cur++;
}
ints[0] = i-1;
return(cur);
}
struct {
const char *str;
void (*setup_func)(char *, int *);
} bootsetups[] = {
{ "reserve=", reserve_setup },
{ "ramdisk=", ramdisk_setup },
#ifdef CONFIG_BUGi386
{ "no-hlt", no_halt },
{ "no387", no_387 },
#endif
#ifdef CONFIG_INET
{ "ether=", eth_setup },
#endif
#ifdef CONFIG_SCSI
{ "max_scsi_luns=", scsi_luns_setup },
#endif
#if defined(CONFIG_BLK_DEV_HD)
{ "hd=", hd_setup },
#endif
#ifdef CONFIG_CHR_DEV_ST
{ "st=", st_setup },
#endif
#ifdef CONFIG_BUSMOUSE
{ "bmouse=", bmouse_setup },
#endif
#ifdef CONFIG_SCSI_SEAGATE
{ "st0x=", st0x_setup },
{ "tmc8xx=", tmc8xx_setup },
#endif
#ifdef CONFIG_SCSI_T128
{ "t128=", t128_setup },
#endif
#ifdef CONFIG_SCSI_PAS16
{ "pas16=", pas16_setup },
#endif
#ifdef CONFIG_SCSI_GENERIC_NCR5380
{ "ncr5380=", generic_NCR5380_setup },
#endif
#ifdef CONFIG_SCSI_AHA152X
{ "aha152x=", aha152x_setup},
#endif
#ifdef CONFIG_SCSI_AHA1542
{ "aha1542=", aha1542_setup},
#endif
#ifdef CONFIG_SCSI_AIC7XXX
{ "aic7xxx=", aic7xxx_setup},
#endif
#ifdef CONFIG_SCSI_BUSLOGIC
{ "buslogic=", buslogic_setup},
#endif
#ifdef CONFIG_BLK_DEV_XD
{ "xd=", xd_setup },
#endif
#ifdef CONFIG_BLK_DEV_FD
{ "floppy=", floppy_setup },
#endif
#ifdef CONFIG_CDU31A
{ "cdu31a=", cdu31a_setup },
#endif CONFIG_CDU31A
#ifdef CONFIG_MCD
{ "mcd=", mcd_setup },
#endif CONFIG_MCD
#ifdef CONFIG_MCDX
{ "mcdx=", mcdx_setup },
#endif CONFIG_MCDX
#ifdef CONFIG_SBPCD
{ "sbpcd=", sbpcd_setup },
#endif CONFIG_SBPCD
#ifdef CONFIG_AZTCD
{ "aztcd=", aztcd_setup },
#endif CONFIG_AZTCD
#ifdef CONFIG_CDU535
{ "sonycd535=", sonycd535_setup },
#endif CONFIG_CDU535
#ifdef CONFIG_GSCD
{ "gscd=", gscd_setup },
#endif CONFIG_GSCD
#ifdef CONFIG_CM206
{ "cm206=", cm206_setup },
#endif CONFIG_CM206
#ifdef CONFIG_OPTCD
{ "optcd=", optcd_setup },
#endif CONFIG_OPTCD
#ifdef CONFIG_SJCD
{ "sjcd=", sjcd_setup },
#endif CONFIG_SJCD
#ifdef CONFIG_SOUND
{ "sound=", sound_setup },
#endif
{ 0, 0 }
};
void ramdisk_setup(char *str, int *ints)
{
if (ints[0] > 0 && ints[1] >= 0)
ramdisk_size = ints[1];
}
static int checksetup(char *line)
{
int i = 0;
int ints[11];
#ifdef CONFIG_BLK_DEV_IDE
/* ide driver needs the basic string, rather than pre-processed values */
if (!strncmp(line,"ide",3) || (!strncmp(line,"hd",2) && line[2] != '=')) {
ide_setup(line);
return 1;
}
#endif
while (bootsetups[i].str) {
int n = strlen(bootsetups[i].str);
if (!strncmp(line,bootsetups[i].str,n)) {
bootsetups[i].setup_func(get_options(line+n,ints), ints);
return 1;
}
i++;
}
return 0;
}
unsigned long loops_per_sec = 1;
static void calibrate_delay(void)
{
int ticks;
printk("Calibrating delay loop.. ");
while (loops_per_sec <<= 1) {
/* wait for "start of" clock tick */
ticks = jiffies;
while (ticks == jiffies)
/* nothing */;
/* Go .. */
ticks = jiffies;
__delay(loops_per_sec);
ticks = jiffies - ticks;
if (ticks >= HZ) {
loops_per_sec = muldiv(loops_per_sec, HZ, ticks);
printk("ok - %lu.%02lu BogoMips\n",
loops_per_sec/500000,
(loops_per_sec/5000) % 100);
return;
}
}
printk("failed\n");
}
/*
* This is a simple kernel command line parsing function: it parses
* the command line, and fills in the arguments/environment to init
* as appropriate. Any cmd-line option is taken to be an environment
* variable if it contains the character '='.
*
*
* This routine also checks for options meant for the kernel.
* These options are not given to init - they are for internal kernel use only.
*/
static void parse_options(char *line)
{
char *next;
static const char *devnames[] = { "hda", "hdb", "hdc", "hdd", "sda", "sdb", "sdc", "sdd", "sde", "fd", "xda", "xdb", NULL };
static int devnums[] = { 0x300, 0x340, 0x1600, 0x1640, 0x800, 0x810, 0x820, 0x830, 0x840, 0x200, 0xD00, 0xD40, 0};
int args, envs;
if (!*line)
return;
args = 0;
envs = 1; /* TERM is set to 'linux' by default */
next = line;
while ((line = next) != NULL) {
if ((next = strchr(line,' ')) != NULL)
*next++ = 0;
/*
* check for kernel options first..
*/
if (!strncmp(line,"root=",5)) {
int n;
line += 5;
if (strncmp(line,"/dev/",5)) {
ROOT_DEV = simple_strtoul(line,NULL,16);
continue;
}
line += 5;
for (n = 0 ; devnames[n] ; n++) {
int len = strlen(devnames[n]);
if (!strncmp(line,devnames[n],len)) {
ROOT_DEV = devnums[n]+simple_strtoul(line+len,NULL,0);
break;
}
}
continue;
}
if (!strcmp(line,"ro")) {
root_mountflags |= MS_RDONLY;
continue;
}
if (!strcmp(line,"rw")) {
root_mountflags &= ~MS_RDONLY;
continue;
}
if (!strcmp(line,"debug")) {
console_loglevel = 10;
continue;
}
if (checksetup(line))
continue;
/*
* Then check if it's an environment variable or
* an option.
*/
if (strchr(line,'=')) {
if (envs >= MAX_INIT_ENVS)
break;
envp_init[++envs] = line;
} else {
if (args >= MAX_INIT_ARGS)
break;
argv_init[++args] = line;
}
}
argv_init[args+1] = NULL;
envp_init[envs+1] = NULL;
}
extern void setup_arch(char **, unsigned long *, unsigned long *);
asmlinkage void start_kernel(void)
{
char * command_line;
/*
* Interrupts are still disabled. Do necessary setups, then
* enable them
*/
setup_arch(&command_line, &memory_start, &memory_end);
memory_start = paging_init(memory_start,memory_end);
trap_init();
init_IRQ();
sched_init();
parse_options(command_line);
init_modules();
#ifdef CONFIG_PROFILE
prof_buffer = (unsigned long *) memory_start;
/* only text is profiled */
prof_len = (unsigned long) &_etext - (unsigned long) &_stext;
prof_len >>= CONFIG_PROFILE_SHIFT;
memory_start += prof_len * sizeof(unsigned long);
#endif
memory_start = console_init(memory_start,memory_end);
#ifdef CONFIG_PCI
memory_start = pci_init(memory_start,memory_end);
#endif
memory_start = kmalloc_init(memory_start,memory_end);
sti();
calibrate_delay();
memory_start = chr_dev_init(memory_start,memory_end);
memory_start = blk_dev_init(memory_start,memory_end);
sti();
#ifdef CONFIG_SCSI
memory_start = scsi_dev_init(memory_start,memory_end);
#endif
#ifdef CONFIG_INET
memory_start = net_dev_init(memory_start,memory_end);
#endif
memory_start = inode_init(memory_start,memory_end);
memory_start = file_table_init(memory_start,memory_end);
memory_start = name_cache_init(memory_start,memory_end);
mem_init(memory_start,memory_end);
buffer_init();
time_init();
sock_init();
#ifdef CONFIG_SYSVIPC
ipc_init();
#endif
sti();
check_bugs();
printk(linux_banner);
if (!fork()) /* we count on this going ok */
init();
/*
* task[0] is meant to be used as an "idle" task: it may not sleep, but
* it might do some general things like count free pages or it could be
* used to implement a reasonable LRU algorithm for the paging routines:
* anything that can be useful, but shouldn't take time from the real
* processes.
*
* Right now task[0] just does a infinite idle loop.
*/
for(;;)
idle();
}
static int printf(const char *fmt, ...)
{
va_list args;
int i;
va_start(args, fmt);
write(1,printbuf,i=vsprintf(printbuf, fmt, args));
va_end(args);
return i;
}
void init(void)
{
int pid,i;
setup();
#ifdef CONFIG_UMSDOS_FS
{
/*
When mounting a umsdos fs as root, we detect
the pseudo_root (/linux) and initialise it here.
pseudo_root is defined in fs/umsdos/inode.c
*/
extern struct inode *pseudo_root;
if (pseudo_root != NULL){
current->fs->root = pseudo_root;
current->fs->pwd = pseudo_root;
}
}
#endif
(void) open("/dev/tty1",O_RDWR,0);
(void) dup(0);
(void) dup(0);
execve("/etc/init",argv_init,envp_init);
execve("/bin/init",argv_init,envp_init);
execve("/sbin/init",argv_init,envp_init);
/* if this fails, fall through to original stuff */
if (!(pid=fork())) {
close(0);
if (open("/etc/rc",O_RDONLY,0))
_exit(1);
execve("/bin/sh",argv_rc,envp_rc);
_exit(2);
}
if (pid>0)
while (pid != wait(&i))
/* nothing */;
while (1) {
if ((pid = fork()) < 0) {
printf("Fork failed in init\n\r");
continue;
}
if (!pid) {
close(0);close(1);close(2);
setsid();
(void) open("/dev/tty1",O_RDWR,0);
(void) dup(0);
(void) dup(0);
_exit(execve("/bin/sh",argv,envp));
}
while (1)
if (pid == wait(&i))
break;
printf("\n\rchild %d died with code %04x\n\r",pid,i);
sync();
}
_exit(0);
}
|