This source file includes following definitions.
- _syscall0
- get_options
- checksetup
- calibrate_delay
- parse_options
- copy_options
- copro_timeout
- start_kernel
- printf
- init
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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 _syscall1(int,setup,void *,BIOS)
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 int vsprintf(char *,const char *,va_list);
72 extern void init(void);
73 extern void init_IRQ(void);
74 extern long kmalloc_init (long,long);
75 extern long blk_dev_init(long,long);
76 extern long chr_dev_init(long,long);
77 extern void floppy_init(void);
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 unsigned long simple_strtoul(const char *,char **,unsigned int);
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 st0x_setup(char *str, int *ints);
89 extern void tmc8xx_setup(char *str, int *ints);
90 extern void t128_setup(char *str, int *ints);
91 extern void generic_NCR5380_setup(char *str, int *intr);
92 extern void aha152x_setup(char *str, int *ints);
93 extern void sound_setup(char *str, int *ints);
94 #ifdef CONFIG_SBPCD
95 extern void sbpcd_setup(char *str, int *ints);
96 #endif CONFIG_SBPCD
97
98 #ifdef CONFIG_SYSVIPC
99 extern void ipc_init(void);
100 #endif
101 #ifdef CONFIG_SCSI
102 extern unsigned long scsi_dev_init(unsigned long, unsigned long);
103 #endif
104
105
106
107
108 #define PARAM empty_zero_page
109 #define EXT_MEM_K (*(unsigned short *) (PARAM+2))
110 #define DRIVE_INFO (*(struct drive_info_struct *) (PARAM+0x80))
111 #define SCREEN_INFO (*(struct screen_info *) (PARAM+0))
112 #define MOUNT_ROOT_RDONLY (*(unsigned short *) (PARAM+0x1F2))
113 #define RAMDISK_SIZE (*(unsigned short *) (PARAM+0x1F8))
114 #define ORIG_ROOT_DEV (*(unsigned short *) (PARAM+0x1FC))
115 #define AUX_DEVICE_INFO (*(unsigned char *) (PARAM+0x1FF))
116
117
118
119
120 #define MAX_INIT_ARGS 8
121 #define MAX_INIT_ENVS 8
122 #define COMMAND_LINE ((char *) (PARAM+2048))
123 #define COMMAND_LINE_SIZE 256
124
125 extern void time_init(void);
126
127 static unsigned long memory_start = 0;
128
129 static unsigned long memory_end = 0;
130 static unsigned long low_memory_start = 0;
131
132 static char term[21];
133 int rows, cols;
134
135 static char * argv_init[MAX_INIT_ARGS+2] = { "init", NULL, };
136 static char * envp_init[MAX_INIT_ENVS+2] = { "HOME=/", term, NULL, };
137
138 static char * argv_rc[] = { "/bin/sh", NULL };
139 static char * envp_rc[] = { "HOME=/", term, NULL };
140
141 static char * argv[] = { "-/bin/sh",NULL };
142 static char * envp[] = { "HOME=/usr/root", term, NULL };
143
144 struct drive_info_struct { char dummy[32]; } drive_info;
145 struct screen_info screen_info;
146
147 unsigned char aux_device_present;
148 int ramdisk_size;
149 int root_mountflags = 0;
150
151 static char fpu_error = 0;
152
153 static char command_line[COMMAND_LINE_SIZE] = { 0, };
154
155 char *get_options(char *str, int *ints)
156 {
157 char *cur = str;
158 int i=1;
159
160 while (cur && isdigit(*cur) && i <= 10) {
161 ints[i++] = simple_strtoul(cur,NULL,0);
162 if ((cur = strchr(cur,',')) != NULL)
163 cur++;
164 }
165 ints[0] = i-1;
166 return(cur);
167 }
168
169 struct {
170 char *str;
171 void (*setup_func)(char *, int *);
172 } bootsetups[] = {
173 { "reserve=", reserve_setup },
174 #ifdef CONFIG_INET
175 { "ether=", eth_setup },
176 #endif
177 #ifdef CONFIG_BLK_DEV_HD
178 { "hd=", hd_setup },
179 #endif
180 #ifdef CONFIG_BUSMOUSE
181 { "bmouse=", bmouse_setup },
182 #endif
183 #ifdef CONFIG_SCSI_SEAGATE
184 { "st0x=", st0x_setup },
185 { "tmc8xx=", tmc8xx_setup },
186 #endif
187 #ifdef CONFIG_SCSI_T128
188 { "t128=", t128_setup },
189 #endif
190 #ifdef CONFIG_SCSI_GENERIC_NCR5380
191 { "ncr5380=", generic_NCR5380_setup },
192 #endif
193 #ifdef CONFIG_SCSI_AHA152X
194 { "aha152x=", aha152x_setup},
195 #endif
196 #ifdef CONFIG_BLK_DEV_XD
197 { "xd=", xd_setup },
198 #endif
199 #ifdef CONFIG_MCD
200 { "mcd=", mcd_setup },
201 #endif
202 #ifdef CONFIG_SOUND
203 { "sound=", sound_setup },
204 #endif
205 #ifdef CONFIG_SBPCD
206 { "sbpcd=", sbpcd_setup },
207 #endif CONFIG_SBPCD
208 { 0, 0 }
209 };
210
211 int checksetup(char *line)
212 {
213 int i = 0;
214 int ints[11];
215
216 while (bootsetups[i].str) {
217 int n = strlen(bootsetups[i].str);
218 if (!strncmp(line,bootsetups[i].str,n)) {
219 bootsetups[i].setup_func(get_options(line+n,ints), ints);
220 return(0);
221 }
222 i++;
223 }
224 return(1);
225 }
226
227 unsigned long loops_per_sec = 1;
228
229 static void calibrate_delay(void)
230 {
231 int ticks;
232
233 printk("Calibrating delay loop.. ");
234 while (loops_per_sec <<= 1) {
235 ticks = jiffies;
236 __delay(loops_per_sec);
237 ticks = jiffies - ticks;
238 if (ticks >= HZ) {
239 __asm__("mull %1 ; divl %2"
240 :"=a" (loops_per_sec)
241 :"d" (HZ),
242 "r" (ticks),
243 "0" (loops_per_sec)
244 :"dx");
245 printk("ok - %lu.%02lu BogoMips\n",
246 loops_per_sec/500000,
247 (loops_per_sec/5000) % 100);
248 return;
249 }
250 }
251 printk("failed\n");
252 }
253
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264
265
266 static void parse_options(char *line)
267 {
268 char *next;
269 char *devnames[] = { "hda", "hdb", "sda", "sdb", "sdc", "sdd", "sde", "fd", "xda", "xdb", NULL };
270 int devnums[] = { 0x300, 0x340, 0x800, 0x810, 0x820, 0x830, 0x840, 0x200, 0xC00, 0xC40, 0};
271 int args, envs;
272
273 if (!*line)
274 return;
275 args = 0;
276 envs = 1;
277 next = line;
278 while ((line = next) != NULL) {
279 if ((next = strchr(line,' ')) != NULL)
280 *next++ = 0;
281
282
283
284 if (!strncmp(line,"root=",5)) {
285 int n;
286 line += 5;
287 if (strncmp(line,"/dev/",5)) {
288 ROOT_DEV = simple_strtoul(line,NULL,16);
289 continue;
290 }
291 line += 5;
292 for (n = 0 ; devnames[n] ; n++) {
293 int len = strlen(devnames[n]);
294 if (!strncmp(line,devnames[n],len)) {
295 ROOT_DEV = devnums[n]+simple_strtoul(line+len,NULL,16);
296 break;
297 }
298 }
299 } else if (!strcmp(line,"ro"))
300 root_mountflags |= MS_RDONLY;
301 else if (!strcmp(line,"rw"))
302 root_mountflags &= ~MS_RDONLY;
303 else if (!strcmp(line,"debug"))
304 console_loglevel = 10;
305 else if (!strcmp(line,"no387")) {
306 hard_math = 0;
307 __asm__("movl %%cr0,%%eax\n\t"
308 "orl $0xE,%%eax\n\t"
309 "movl %%eax,%%cr0\n\t" : : : "ax");
310 } else
311 checksetup(line);
312
313
314
315
316 if (strchr(line,'=')) {
317 if (envs >= MAX_INIT_ENVS)
318 break;
319 envp_init[++envs] = line;
320 } else {
321 if (args >= MAX_INIT_ARGS)
322 break;
323 argv_init[++args] = line;
324 }
325 }
326 argv_init[args+1] = NULL;
327 envp_init[envs+1] = NULL;
328 }
329
330 static void copy_options(char * to, char * from)
331 {
332 char c = ' ';
333 int len = 0;
334
335 for (;;) {
336 if (c == ' ' && *(unsigned long *)from == *(unsigned long *)"mem=")
337 memory_end = simple_strtoul(from+4, &from, 0);
338 c = *(from++);
339 if (!c)
340 break;
341 if (COMMAND_LINE_SIZE <= ++len)
342 break;
343 *(to++) = c;
344 }
345 *to = '\0';
346 }
347
348 static void copro_timeout(void)
349 {
350 fpu_error = 1;
351 timer_table[COPRO_TIMER].expires = jiffies+100;
352 timer_active |= 1<<COPRO_TIMER;
353 printk("387 failed: trying to reset\n");
354 send_sig(SIGFPE, last_task_used_math, 1);
355 outb_p(0,0xf1);
356 outb_p(0,0xf0);
357 }
358
359 asmlinkage void start_kernel(void)
360 {
361
362
363
364
365 set_call_gate(&default_ldt,lcall7);
366 ROOT_DEV = ORIG_ROOT_DEV;
367 drive_info = DRIVE_INFO;
368 screen_info = SCREEN_INFO;
369 aux_device_present = AUX_DEVICE_INFO;
370 memory_end = (1<<20) + (EXT_MEM_K<<10);
371 memory_end &= PAGE_MASK;
372 ramdisk_size = RAMDISK_SIZE;
373 copy_options(command_line,COMMAND_LINE);
374 #ifdef CONFIG_MAX_16M
375 if (memory_end > 16*1024*1024)
376 memory_end = 16*1024*1024;
377 #endif
378 if (MOUNT_ROOT_RDONLY)
379 root_mountflags |= MS_RDONLY;
380 if ((unsigned long)&end >= (1024*1024)) {
381 memory_start = (unsigned long) &end;
382 low_memory_start = PAGE_SIZE;
383 } else {
384 memory_start = 1024*1024;
385 low_memory_start = (unsigned long) &end;
386 }
387 low_memory_start = PAGE_ALIGN(low_memory_start);
388 memory_start = paging_init(memory_start,memory_end);
389 if (strncmp((char*)0x0FFFD9, "EISA", 4) == 0)
390 EISA_bus = 1;
391 trap_init();
392 init_IRQ();
393 sched_init();
394 parse_options(command_line);
395 #ifdef CONFIG_PROFILE
396 prof_buffer = (unsigned long *) memory_start;
397 prof_len = (unsigned long) &end;
398 prof_len >>= 2;
399 memory_start += prof_len * sizeof(unsigned long);
400 #endif
401 memory_start = kmalloc_init(memory_start,memory_end);
402 memory_start = chr_dev_init(memory_start,memory_end);
403 memory_start = blk_dev_init(memory_start,memory_end);
404 sti();
405 calibrate_delay();
406 #ifdef CONFIG_INET
407 memory_start = net_dev_init(memory_start,memory_end);
408 #endif
409 #ifdef CONFIG_SCSI
410 memory_start = scsi_dev_init(memory_start,memory_end);
411 #endif
412 memory_start = inode_init(memory_start,memory_end);
413 memory_start = file_table_init(memory_start,memory_end);
414 mem_init(low_memory_start,memory_start,memory_end);
415 buffer_init();
416 time_init();
417 floppy_init();
418 sock_init();
419 #ifdef CONFIG_SYSVIPC
420 ipc_init();
421 #endif
422 sti();
423
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430
431
432
433 if (hard_math) {
434 unsigned short control_word;
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 printk("Ok, fpu using %s error reporting.\n",
448 ignore_irq13?"exception 16":"irq13");
449 }
450 #ifndef CONFIG_MATH_EMULATION
451 else {
452 printk("No coprocessor found and no math emulation present.\n");
453 printk("Giving up.\n");
454 for (;;) ;
455 }
456 #endif
457
458 system_utsname.machine[1] = '0' + x86;
459 printk(linux_banner);
460
461 move_to_user_mode();
462 if (!fork())
463 init();
464
465
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467
468
469
470
471
472
473 for(;;)
474 idle();
475 }
476
477 static int printf(const char *fmt, ...)
478 {
479 va_list args;
480 int i;
481
482 va_start(args, fmt);
483 write(1,printbuf,i=vsprintf(printbuf, fmt, args));
484 va_end(args);
485 return i;
486 }
487
488 void init(void)
489 {
490 int pid,i;
491
492 setup((void *) &drive_info);
493 sprintf(term, "TERM=con%dx%d", ORIG_VIDEO_COLS, ORIG_VIDEO_LINES);
494 (void) open("/dev/tty1",O_RDWR,0);
495 (void) dup(0);
496 (void) dup(0);
497
498 execve("/etc/init",argv_init,envp_init);
499 execve("/bin/init",argv_init,envp_init);
500 execve("/sbin/init",argv_init,envp_init);
501
502
503 if (!(pid=fork())) {
504 close(0);
505 if (open("/etc/rc",O_RDONLY,0))
506 _exit(1);
507 execve("/bin/sh",argv_rc,envp_rc);
508 _exit(2);
509 }
510 if (pid>0)
511 while (pid != wait(&i))
512 ;
513 while (1) {
514 if ((pid = fork()) < 0) {
515 printf("Fork failed in init\n\r");
516 continue;
517 }
518 if (!pid) {
519 close(0);close(1);close(2);
520 setsid();
521 (void) open("/dev/tty1",O_RDWR,0);
522 (void) dup(0);
523 (void) dup(0);
524 _exit(execve("/bin/sh",argv,envp));
525 }
526 while (1)
527 if (pid == wait(&i))
528 break;
529 printf("\n\rchild %d died with code %04x\n\r",pid,i);
530 sync();
531 }
532 _exit(0);
533 }