This source file includes following definitions.
- _syscall0
- get_options
- ramdisk_setup
- checksetup
- calibrate_delay
- parse_options
- copy_options
- copro_timeout
- check_fpu
- check_hlt
- check_bugs
- start_kernel
- printf
- init
1
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6
7 #include <stdarg.h>
8
9 #include <asm/system.h>
10 #include <asm/io.h>
11
12 #include <linux/types.h>
13 #include <linux/fcntl.h>
14 #include <linux/config.h>
15 #include <linux/sched.h>
16 #include <linux/tty.h>
17 #include <linux/head.h>
18 #include <linux/unistd.h>
19 #include <linux/string.h>
20 #include <linux/timer.h>
21 #include <linux/fs.h>
22 #include <linux/ctype.h>
23 #include <linux/delay.h>
24 #include <linux/utsname.h>
25 #include <linux/ioport.h>
26
27 extern unsigned long * prof_buffer;
28 extern unsigned long prof_len;
29 extern char edata, end;
30 extern char *linux_banner;
31 asmlinkage void lcall7(void);
32 struct desc_struct default_ldt;
33
34
35
36
37
38
39
40
41
42
43
44
45
46 #define __NR__exit __NR_exit
47 static inline _syscall0(int,idle)
48 static inline _syscall0(int,fork)
49 static inline _syscall0(int,pause)
50 static inline _syscall0(int,setup)
51 static inline _syscall0(int,sync)
52 static inline _syscall0(pid_t,setsid)
53 static inline _syscall3(int,write,int,fd,const char *,buf,off_t,count)
54 static inline _syscall1(int,dup,int,fd)
55 static inline _syscall3(int,execve,const char *,file,char **,argv,char **,envp)
56 static inline _syscall3(int,open,const char *,file,int,flag,int,mode)
57 static inline _syscall1(int,close,int,fd)
58 static inline _syscall1(int,_exit,int,exitcode)
59 static inline _syscall3(pid_t,waitpid,pid_t,pid,int *,wait_stat,int,options)
60
61 static inline pid_t wait(int * wait_stat)
62 {
63 return waitpid(-1,wait_stat,0);
64 }
65
66 static char printbuf[1024];
67
68 extern int console_loglevel;
69
70 extern char empty_zero_page[PAGE_SIZE];
71 extern void init(void);
72 extern void init_IRQ(void);
73 extern void init_modules(void);
74 extern long console_init(long, long);
75 extern long kmalloc_init(long,long);
76 extern long blk_dev_init(long,long);
77 extern long chr_dev_init(long,long);
78 extern void sock_init(void);
79 extern long rd_init(long mem_start, int length);
80 unsigned long net_dev_init(unsigned long, unsigned long);
81 extern long bios32_init(long, long);
82
83 extern void hd_setup(char *str, int *ints);
84 extern void bmouse_setup(char *str, int *ints);
85 extern void eth_setup(char *str, int *ints);
86 extern void xd_setup(char *str, int *ints);
87 extern void mcd_setup(char *str, int *ints);
88 extern void st_setup(char *str, int *ints);
89 extern void st0x_setup(char *str, int *ints);
90 extern void tmc8xx_setup(char *str, int *ints);
91 extern void t128_setup(char *str, int *ints);
92 extern void pas16_setup(char *str, int *ints);
93 extern void generic_NCR5380_setup(char *str, int *intr);
94 extern void aha152x_setup(char *str, int *ints);
95 extern void aha1542_setup(char *str, int *ints);
96 extern void aha274x_setup(char *str, int *ints);
97 extern void scsi_luns_setup(char *str, int *ints);
98 extern void sound_setup(char *str, int *ints);
99 #ifdef CONFIG_SBPCD
100 extern void sbpcd_setup(char *str, int *ints);
101 #endif CONFIG_SBPCD
102 #ifdef CONFIG_CDU31A
103 extern void cdu31a_setup(char *str, int *ints);
104 #endif CONFIG_CDU31A
105 void ramdisk_setup(char *str, int *ints);
106
107 #ifdef CONFIG_SYSVIPC
108 extern void ipc_init(void);
109 #endif
110 #ifdef CONFIG_SCSI
111 extern unsigned long scsi_dev_init(unsigned long, unsigned long);
112 #endif
113
114
115
116
117 #define PARAM empty_zero_page
118 #define EXT_MEM_K (*(unsigned short *) (PARAM+2))
119 #define DRIVE_INFO (*(struct drive_info_struct *) (PARAM+0x80))
120 #define SCREEN_INFO (*(struct screen_info *) (PARAM+0))
121 #define MOUNT_ROOT_RDONLY (*(unsigned short *) (PARAM+0x1F2))
122 #define RAMDISK_SIZE (*(unsigned short *) (PARAM+0x1F8))
123 #define ORIG_ROOT_DEV (*(unsigned short *) (PARAM+0x1FC))
124 #define AUX_DEVICE_INFO (*(unsigned char *) (PARAM+0x1FF))
125
126
127
128
129 #define MAX_INIT_ARGS 8
130 #define MAX_INIT_ENVS 8
131 #define COMMAND_LINE ((char *) (PARAM+2048))
132 #define COMMAND_LINE_SIZE 256
133
134 extern void time_init(void);
135
136 static unsigned long memory_start = 0;
137
138 static unsigned long memory_end = 0;
139 static unsigned long low_memory_start = 0;
140
141 static char term[21];
142 int rows, cols;
143
144 static char * argv_init[MAX_INIT_ARGS+2] = { "init", NULL, };
145 static char * envp_init[MAX_INIT_ENVS+2] = { "HOME=/", term, NULL, };
146
147 static char * argv_rc[] = { "/bin/sh", NULL };
148 static char * envp_rc[] = { "HOME=/", term, NULL };
149
150 static char * argv[] = { "-/bin/sh",NULL };
151 static char * envp[] = { "HOME=/usr/root", term, NULL };
152
153 struct drive_info_struct { char dummy[32]; } drive_info;
154 struct screen_info screen_info;
155
156 unsigned char aux_device_present;
157 int ramdisk_size;
158 int root_mountflags = 0;
159
160 static char fpu_error = 0;
161
162 static char command_line[COMMAND_LINE_SIZE] = { 0, };
163
164 char *get_options(char *str, int *ints)
165 {
166 char *cur = str;
167 int i=1;
168
169 while (cur && isdigit(*cur) && i <= 10) {
170 ints[i++] = simple_strtoul(cur,NULL,0);
171 if ((cur = strchr(cur,',')) != NULL)
172 cur++;
173 }
174 ints[0] = i-1;
175 return(cur);
176 }
177
178 struct {
179 char *str;
180 void (*setup_func)(char *, int *);
181 } bootsetups[] = {
182 { "reserve=", reserve_setup },
183 { "ramdisk=", ramdisk_setup },
184 #ifdef CONFIG_INET
185 { "ether=", eth_setup },
186 #endif
187 #ifdef CONFIG_SCSI
188 { "max_scsi_luns=", scsi_luns_setup },
189 #endif
190 #ifdef CONFIG_BLK_DEV_HD
191 { "hd=", hd_setup },
192 #endif
193 #ifdef CONFIG_CHR_DEV_ST
194 { "st=", st_setup },
195 #endif
196 #ifdef CONFIG_BUSMOUSE
197 { "bmouse=", bmouse_setup },
198 #endif
199 #ifdef CONFIG_SCSI_SEAGATE
200 { "st0x=", st0x_setup },
201 { "tmc8xx=", tmc8xx_setup },
202 #endif
203 #ifdef CONFIG_SCSI_T128
204 { "t128=", t128_setup },
205 #endif
206 #ifdef CONFIG_SCSI_PAS16
207 { "pas16=", pas16_setup },
208 #endif
209 #ifdef CONFIG_SCSI_GENERIC_NCR5380
210 { "ncr5380=", generic_NCR5380_setup },
211 #endif
212 #ifdef CONFIG_SCSI_AHA152X
213 { "aha152x=", aha152x_setup},
214 #endif
215 #ifdef CONFIG_SCSI_AHA1542
216 { "aha1542=", aha1542_setup},
217 #endif
218 #ifdef CONFIG_SCSI_AHA274X
219 { "aha274x=", aha274x_setup},
220 #endif
221 #ifdef CONFIG_BLK_DEV_XD
222 { "xd=", xd_setup },
223 #endif
224 #ifdef CONFIG_MCD
225 { "mcd=", mcd_setup },
226 #endif
227 #ifdef CONFIG_SOUND
228 { "sound=", sound_setup },
229 #endif
230 #ifdef CONFIG_SBPCD
231 { "sbpcd=", sbpcd_setup },
232 #endif CONFIG_SBPCD
233 #ifdef CONFIG_CDU31A
234 { "cdu31a=", cdu31a_setup },
235 #endif CONFIG_CDU31A
236 { 0, 0 }
237 };
238
239 void ramdisk_setup(char *str, int *ints)
240 {
241 if (ints[0] > 0 && ints[1] >= 0)
242 ramdisk_size = ints[1];
243 }
244
245 static int checksetup(char *line)
246 {
247 int i = 0;
248 int ints[11];
249
250 while (bootsetups[i].str) {
251 int n = strlen(bootsetups[i].str);
252 if (!strncmp(line,bootsetups[i].str,n)) {
253 bootsetups[i].setup_func(get_options(line+n,ints), ints);
254 return 1;
255 }
256 i++;
257 }
258 return 0;
259 }
260
261 unsigned long loops_per_sec = 1;
262
263 static void calibrate_delay(void)
264 {
265 int ticks;
266
267 printk("Calibrating delay loop.. ");
268 while (loops_per_sec <<= 1) {
269
270 ticks = jiffies;
271 while (ticks == jiffies)
272 ;
273
274 ticks = jiffies;
275 __delay(loops_per_sec);
276 ticks = jiffies - ticks;
277 if (ticks >= HZ) {
278 __asm__("mull %1 ; divl %2"
279 :"=a" (loops_per_sec)
280 :"d" (HZ),
281 "r" (ticks),
282 "0" (loops_per_sec)
283 :"dx");
284 printk("ok - %lu.%02lu BogoMips\n",
285 loops_per_sec/500000,
286 (loops_per_sec/5000) % 100);
287 return;
288 }
289 }
290 printk("failed\n");
291 }
292
293
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297
298
299
300
301
302
303
304
305 static void parse_options(char *line)
306 {
307 char *next;
308 char *devnames[] = { "hda", "hdb", "sda", "sdb", "sdc", "sdd", "sde", "fd", "xda", "xdb", NULL };
309 int devnums[] = { 0x300, 0x340, 0x800, 0x810, 0x820, 0x830, 0x840, 0x200, 0xD00, 0xD40, 0};
310 int args, envs;
311
312 if (!*line)
313 return;
314 args = 0;
315 envs = 1;
316 next = line;
317 while ((line = next) != NULL) {
318 if ((next = strchr(line,' ')) != NULL)
319 *next++ = 0;
320
321
322
323 if (!strncmp(line,"root=",5)) {
324 int n;
325 line += 5;
326 if (strncmp(line,"/dev/",5)) {
327 ROOT_DEV = simple_strtoul(line,NULL,16);
328 continue;
329 }
330 line += 5;
331 for (n = 0 ; devnames[n] ; n++) {
332 int len = strlen(devnames[n]);
333 if (!strncmp(line,devnames[n],len)) {
334 ROOT_DEV = devnums[n]+simple_strtoul(line+len,NULL,0);
335 break;
336 }
337 }
338 continue;
339 }
340 if (!strcmp(line,"ro")) {
341 root_mountflags |= MS_RDONLY;
342 continue;
343 }
344 if (!strcmp(line,"rw")) {
345 root_mountflags &= ~MS_RDONLY;
346 continue;
347 }
348 if (!strcmp(line,"debug")) {
349 console_loglevel = 10;
350 continue;
351 }
352 if (!strcmp(line,"no-hlt")) {
353 hlt_works_ok = 0;
354 continue;
355 }
356 if (!strcmp(line,"no387")) {
357 hard_math = 0;
358 __asm__("movl %%cr0,%%eax\n\t"
359 "orl $0xE,%%eax\n\t"
360 "movl %%eax,%%cr0\n\t" : : : "ax");
361 continue;
362 }
363 if (checksetup(line))
364 continue;
365
366
367
368
369 if (strchr(line,'=')) {
370 if (envs >= MAX_INIT_ENVS)
371 break;
372 envp_init[++envs] = line;
373 } else {
374 if (args >= MAX_INIT_ARGS)
375 break;
376 argv_init[++args] = line;
377 }
378 }
379 argv_init[args+1] = NULL;
380 envp_init[envs+1] = NULL;
381 }
382
383 static void copy_options(char * to, char * from)
384 {
385 char c = ' ';
386 int len = 0;
387
388 for (;;) {
389 if (c == ' ' && *(unsigned long *)from == *(unsigned long *)"mem=")
390 memory_end = simple_strtoul(from+4, &from, 0);
391 c = *(from++);
392 if (!c)
393 break;
394 if (COMMAND_LINE_SIZE <= ++len)
395 break;
396 *(to++) = c;
397 }
398 *to = '\0';
399 }
400
401 static void copro_timeout(void)
402 {
403 fpu_error = 1;
404 timer_table[COPRO_TIMER].expires = jiffies+100;
405 timer_active |= 1<<COPRO_TIMER;
406 printk("387 failed: trying to reset\n");
407 send_sig(SIGFPE, last_task_used_math, 1);
408 outb_p(0,0xf1);
409 outb_p(0,0xf0);
410 }
411
412 static void check_fpu(void)
413 {
414 static double x = 4195835.0;
415 static double y = 3145727.0;
416 unsigned short control_word;
417 extern int fdiv_bug;
418
419 if (!hard_math) {
420 #ifndef CONFIG_MATH_EMULATION
421 printk("No coprocessor found and no math emulation present.\n");
422 printk("Giving up.\n");
423 for (;;) ;
424 #endif
425 return;
426 }
427
428
429
430
431
432
433
434
435
436 printk("Checking 386/387 coupling... ");
437 timer_table[COPRO_TIMER].expires = jiffies+50;
438 timer_table[COPRO_TIMER].fn = copro_timeout;
439 timer_active |= 1<<COPRO_TIMER;
440 __asm__("clts ; fninit ; fnstcw %0 ; fwait":"=m" (*&control_word));
441 control_word &= 0xffc0;
442 __asm__("fldcw %0 ; fwait": :"m" (*&control_word));
443 outb_p(inb_p(0x21) | (1 << 2), 0x21);
444 __asm__("fldz ; fld1 ; fdiv %st,%st(1) ; fwait");
445 timer_active &= ~(1<<COPRO_TIMER);
446 if (fpu_error)
447 return;
448 if (!ignore_irq13) {
449 printk("Ok, fpu using old IRQ13 error reporting\n");
450 return;
451 }
452 __asm__("fninit\n\t"
453 "fldl %1\n\t"
454 "fdivl %2\n\t"
455 "fmull %2\n\t"
456 "fldl %1\n\t"
457 "fsubp %%st,%%st(1)\n\t"
458 "fistpl %0\n\t"
459 "fwait\n\t"
460 "fninit"
461 : "=m" (*&fdiv_bug)
462 : "m" (*&x), "m" (*&y));
463 if (!fdiv_bug) {
464 printk("Ok, fpu using exception 16 error reporting.\n");
465 return;
466
467 }
468 printk("Ok, FDIV bug i%c86 system\n", '0'+x86);
469 }
470
471 static void check_hlt(void)
472 {
473 printk("Checking 'hlt' instruction... ");
474 if (!hlt_works_ok) {
475 printk("disabled\n");
476 return;
477 }
478 __asm__ __volatile__("hlt ; hlt ; hlt ; hlt");
479 printk("Ok.\n");
480 }
481
482 static void check_bugs(void)
483 {
484 check_fpu();
485 check_hlt();
486 }
487
488 asmlinkage void start_kernel(void)
489 {
490
491
492
493
494 set_call_gate(&default_ldt,lcall7);
495 ROOT_DEV = ORIG_ROOT_DEV;
496 drive_info = DRIVE_INFO;
497 screen_info = SCREEN_INFO;
498 aux_device_present = AUX_DEVICE_INFO;
499 memory_end = (1<<20) + (EXT_MEM_K<<10);
500 memory_end &= PAGE_MASK;
501 ramdisk_size = RAMDISK_SIZE;
502 copy_options(command_line,COMMAND_LINE);
503 #ifdef CONFIG_MAX_16M
504 if (memory_end > 16*1024*1024)
505 memory_end = 16*1024*1024;
506 #endif
507 if (MOUNT_ROOT_RDONLY)
508 root_mountflags |= MS_RDONLY;
509 if ((unsigned long)&end >= (1024*1024)) {
510 memory_start = (unsigned long) &end;
511 low_memory_start = PAGE_SIZE;
512 } else {
513 memory_start = 1024*1024;
514 low_memory_start = (unsigned long) &end;
515 }
516 low_memory_start = PAGE_ALIGN(low_memory_start);
517 memory_start = paging_init(memory_start,memory_end);
518 if (strncmp((char*)0x0FFFD9, "EISA", 4) == 0)
519 EISA_bus = 1;
520 trap_init();
521 init_IRQ();
522 sched_init();
523 parse_options(command_line);
524 init_modules();
525 #ifdef CONFIG_PROFILE
526 prof_buffer = (unsigned long *) memory_start;
527 prof_len = (unsigned long) &end;
528 prof_len >>= 2;
529 memory_start += prof_len * sizeof(unsigned long);
530 #endif
531 memory_start = console_init(memory_start,memory_end);
532 memory_start = bios32_init(memory_start,memory_end);
533 memory_start = kmalloc_init(memory_start,memory_end);
534 memory_start = chr_dev_init(memory_start,memory_end);
535 memory_start = blk_dev_init(memory_start,memory_end);
536 sti();
537 calibrate_delay();
538 #ifdef CONFIG_SCSI
539 memory_start = scsi_dev_init(memory_start,memory_end);
540 #endif
541 #ifdef CONFIG_INET
542 memory_start = net_dev_init(memory_start,memory_end);
543 #endif
544 memory_start = inode_init(memory_start,memory_end);
545 memory_start = file_table_init(memory_start,memory_end);
546 memory_start = name_cache_init(memory_start,memory_end);
547 mem_init(low_memory_start,memory_start,memory_end);
548 buffer_init();
549 time_init();
550 sock_init();
551 #ifdef CONFIG_SYSVIPC
552 ipc_init();
553 #endif
554 sti();
555 check_bugs();
556
557 system_utsname.machine[1] = '0' + x86;
558 printk(linux_banner);
559
560 move_to_user_mode();
561 if (!fork())
562 init();
563
564
565
566
567
568
569
570
571
572 for(;;)
573 idle();
574 }
575
576 static int printf(const char *fmt, ...)
577 {
578 va_list args;
579 int i;
580
581 va_start(args, fmt);
582 write(1,printbuf,i=vsprintf(printbuf, fmt, args));
583 va_end(args);
584 return i;
585 }
586
587 void init(void)
588 {
589 int pid,i;
590
591 setup();
592 sprintf(term, "TERM=con%dx%d", ORIG_VIDEO_COLS, ORIG_VIDEO_LINES);
593
594 #ifdef CONFIG_UMSDOS_FS
595 {
596
597
598
599
600
601 extern struct inode *pseudo_root;
602 if (pseudo_root != NULL){
603 current->fs->root = pseudo_root;
604 current->fs->pwd = pseudo_root;
605 }
606 }
607 #endif
608
609 (void) open("/dev/tty1",O_RDWR,0);
610 (void) dup(0);
611 (void) dup(0);
612
613 execve("/etc/init",argv_init,envp_init);
614 execve("/bin/init",argv_init,envp_init);
615 execve("/sbin/init",argv_init,envp_init);
616
617
618 if (!(pid=fork())) {
619 close(0);
620 if (open("/etc/rc",O_RDONLY,0))
621 _exit(1);
622 execve("/bin/sh",argv_rc,envp_rc);
623 _exit(2);
624 }
625 if (pid>0)
626 while (pid != wait(&i))
627 ;
628 while (1) {
629 if ((pid = fork()) < 0) {
630 printf("Fork failed in init\n\r");
631 continue;
632 }
633 if (!pid) {
634 close(0);close(1);close(2);
635 setsid();
636 (void) open("/dev/tty1",O_RDWR,0);
637 (void) dup(0);
638 (void) dup(0);
639 _exit(execve("/bin/sh",argv,envp));
640 }
641 while (1)
642 if (pid == wait(&i))
643 break;
644 printf("\n\rchild %d died with code %04x\n\r",pid,i);
645 sync();
646 }
647 _exit(0);
648 }