This source file includes following definitions.
- _syscall0
- get_options
- checksetup
- calibrate_delay
- parse_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
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37
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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
95 #ifdef CONFIG_SYSVIPC
96 extern void ipc_init(void);
97 #endif
98 #ifdef CONFIG_SCSI
99 extern unsigned long scsi_dev_init(unsigned long, unsigned long);
100 #endif
101
102
103
104
105 #define PARAM empty_zero_page
106 #define EXT_MEM_K (*(unsigned short *) (PARAM+2))
107 #define DRIVE_INFO (*(struct drive_info_struct *) (PARAM+0x80))
108 #define SCREEN_INFO (*(struct screen_info *) (PARAM+0))
109 #define MOUNT_ROOT_RDONLY (*(unsigned short *) (PARAM+0x1F2))
110 #define RAMDISK_SIZE (*(unsigned short *) (PARAM+0x1F8))
111 #define ORIG_ROOT_DEV (*(unsigned short *) (PARAM+0x1FC))
112 #define AUX_DEVICE_INFO (*(unsigned char *) (PARAM+0x1FF))
113
114
115
116
117 #define MAX_INIT_ARGS 8
118 #define MAX_INIT_ENVS 8
119 #define COMMAND_LINE ((char *) (PARAM+2048))
120
121 extern void time_init(void);
122
123 static unsigned long memory_start = 0;
124
125 static unsigned long memory_end = 0;
126 static unsigned long low_memory_start = 0;
127
128 static char term[21];
129 int rows, cols;
130
131 static char * argv_init[MAX_INIT_ARGS+2] = { "init", NULL, };
132 static char * envp_init[MAX_INIT_ENVS+2] = { "HOME=/", term, NULL, };
133
134 static char * argv_rc[] = { "/bin/sh", NULL };
135 static char * envp_rc[] = { "HOME=/", term, NULL };
136
137 static char * argv[] = { "-/bin/sh",NULL };
138 static char * envp[] = { "HOME=/usr/root", term, NULL };
139
140 struct drive_info_struct { char dummy[32]; } drive_info;
141 struct screen_info screen_info;
142
143 unsigned char aux_device_present;
144 int ramdisk_size;
145 int root_mountflags = 0;
146
147 static char fpu_error = 0;
148
149 static char command_line[80] = { 0, };
150
151 char *get_options(char *str, int *ints)
152 {
153 char *cur = str;
154 int i=1;
155
156 while (cur && isdigit(*cur) && i <= 10) {
157 ints[i++] = simple_strtoul(cur,NULL,0);
158 if ((cur = strchr(cur,',')) != NULL)
159 cur++;
160 }
161 ints[0] = i-1;
162 return(cur);
163 }
164
165 struct {
166 char *str;
167 void (*setup_func)(char *, int *);
168 } bootsetups[] = {
169 { "reserve=", reserve_setup },
170 #ifdef CONFIG_INET
171 { "ether=", eth_setup },
172 #endif
173 #ifdef CONFIG_BLK_DEV_HD
174 { "hd=", hd_setup },
175 #endif
176 #ifdef CONFIG_BUSMOUSE
177 { "bmouse=", bmouse_setup },
178 #endif
179 #ifdef CONFIG_SCSI_SEAGATE
180 { "st0x=", st0x_setup },
181 { "tmc8xx=", tmc8xx_setup },
182 #endif
183 #ifdef CONFIG_SCSI_T128
184 { "t128=", t128_setup },
185 #endif
186 #ifdef CONFIG_SCSI_GENERIC_NCR5380
187 { "ncr5380=", generic_NCR5380_setup },
188 #endif
189 #ifdef CONFIG_SCSI_AHA152X
190 { "aha152x=", aha152x_setup},
191 #endif
192 #ifdef CONFIG_BLK_DEV_XD
193 { "xd=", xd_setup },
194 #endif
195 #ifdef CONFIG_MCD
196 { "mcd=", mcd_setup },
197 #endif
198 #ifdef CONFIG_SOUND
199 { "sound=", sound_setup },
200 #endif
201 { 0, 0 }
202 };
203
204 int checksetup(char *line)
205 {
206 int i = 0;
207 int ints[11];
208
209 while (bootsetups[i].str) {
210 int n = strlen(bootsetups[i].str);
211 if (!strncmp(line,bootsetups[i].str,n)) {
212 bootsetups[i].setup_func(get_options(line+n,ints), ints);
213 return(0);
214 }
215 i++;
216 }
217 return(1);
218 }
219
220 unsigned long loops_per_sec = 1;
221
222 static void calibrate_delay(void)
223 {
224 int ticks;
225
226 printk("Calibrating delay loop.. ");
227 while (loops_per_sec <<= 1) {
228 ticks = jiffies;
229 __delay(loops_per_sec);
230 ticks = jiffies - ticks;
231 if (ticks >= HZ) {
232 __asm__("mull %1 ; divl %2"
233 :"=a" (loops_per_sec)
234 :"d" (HZ),
235 "r" (ticks),
236 "0" (loops_per_sec)
237 :"dx");
238 printk("ok - %lu.%02lu BogoMips (tm)\n",
239 loops_per_sec/500000,
240 (loops_per_sec/5000) % 100);
241 return;
242 }
243 }
244 printk("failed\n");
245 }
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257
258
259 static void parse_options(char *line)
260 {
261 char *next;
262 char *devnames[] = { "hda", "hdb", "sda", "sdb", "sdc", "sdd", "sde", "fd", "xda", "xdb", NULL };
263 int devnums[] = { 0x300, 0x340, 0x800, 0x810, 0x820, 0x830, 0x840, 0x200, 0xC00, 0xC40, 0};
264 int args, envs;
265
266 if (!*line)
267 return;
268 args = 0;
269 envs = 1;
270 next = line;
271 while ((line = next) != NULL) {
272 if ((next = strchr(line,' ')) != NULL)
273 *next++ = 0;
274
275
276
277 if (!strncmp(line,"root=",5)) {
278 int n;
279 line += 5;
280 if (strncmp(line,"/dev/",5)) {
281 ROOT_DEV = simple_strtoul(line,NULL,16);
282 continue;
283 }
284 line += 5;
285 for (n = 0 ; devnames[n] ; n++) {
286 int len = strlen(devnames[n]);
287 if (!strncmp(line,devnames[n],len)) {
288 ROOT_DEV = devnums[n]+simple_strtoul(line+len,NULL,16);
289 break;
290 }
291 }
292 } else if (!strcmp(line,"ro"))
293 root_mountflags |= MS_RDONLY;
294 else if (!strcmp(line,"rw"))
295 root_mountflags &= ~MS_RDONLY;
296 else if (!strcmp(line,"debug"))
297 console_loglevel = 10;
298 else if (!strcmp(line,"no387")) {
299 hard_math = 0;
300 __asm__("movl %%cr0,%%eax\n\t"
301 "orl $0xE,%%eax\n\t"
302 "movl %%eax,%%cr0\n\t" : : : "ax");
303 } else
304 checksetup(line);
305
306
307
308
309 if (strchr(line,'=')) {
310 if (envs >= MAX_INIT_ENVS)
311 break;
312 envp_init[++envs] = line;
313 } else {
314 if (args >= MAX_INIT_ARGS)
315 break;
316 argv_init[++args] = line;
317 }
318 }
319 argv_init[args+1] = NULL;
320 envp_init[envs+1] = NULL;
321 }
322
323 static void copro_timeout(void)
324 {
325 fpu_error = 1;
326 timer_table[COPRO_TIMER].expires = jiffies+100;
327 timer_active |= 1<<COPRO_TIMER;
328 printk("387 failed: trying to reset\n");
329 send_sig(SIGFPE, last_task_used_math, 1);
330 outb_p(0,0xf1);
331 outb_p(0,0xf0);
332 }
333
334 asmlinkage void start_kernel(void)
335 {
336
337
338
339
340 set_call_gate(&default_ldt,lcall7);
341 ROOT_DEV = ORIG_ROOT_DEV;
342 drive_info = DRIVE_INFO;
343 screen_info = SCREEN_INFO;
344 aux_device_present = AUX_DEVICE_INFO;
345 memory_end = (1<<20) + (EXT_MEM_K<<10);
346 memory_end &= PAGE_MASK;
347 ramdisk_size = RAMDISK_SIZE;
348 strcpy(command_line,COMMAND_LINE);
349 #ifdef CONFIG_MAX_16M
350 if (memory_end > 16*1024*1024)
351 memory_end = 16*1024*1024;
352 #endif
353 if (MOUNT_ROOT_RDONLY)
354 root_mountflags |= MS_RDONLY;
355 if ((unsigned long)&end >= (1024*1024)) {
356 memory_start = (unsigned long) &end;
357 low_memory_start = PAGE_SIZE;
358 } else {
359 memory_start = 1024*1024;
360 low_memory_start = (unsigned long) &end;
361 }
362 low_memory_start = PAGE_ALIGN(low_memory_start);
363 memory_start = paging_init(memory_start,memory_end);
364 trap_init();
365 init_IRQ();
366 sched_init();
367 parse_options(command_line);
368 #ifdef CONFIG_PROFILE
369 prof_buffer = (unsigned long *) memory_start;
370 prof_len = (unsigned long) &end;
371 prof_len >>= 2;
372 memory_start += prof_len * sizeof(unsigned long);
373 #endif
374 memory_start = kmalloc_init(memory_start,memory_end);
375 memory_start = chr_dev_init(memory_start,memory_end);
376 memory_start = blk_dev_init(memory_start,memory_end);
377 sti();
378 calibrate_delay();
379 #ifdef CONFIG_INET
380 memory_start = net_dev_init(memory_start,memory_end);
381 #endif
382 #ifdef CONFIG_SCSI
383 memory_start = scsi_dev_init(memory_start,memory_end);
384 #endif
385 memory_start = inode_init(memory_start,memory_end);
386 memory_start = file_table_init(memory_start,memory_end);
387 mem_init(low_memory_start,memory_start,memory_end);
388 buffer_init();
389 time_init();
390 floppy_init();
391 sock_init();
392 #ifdef CONFIG_SYSVIPC
393 ipc_init();
394 #endif
395 sti();
396
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405
406 if (hard_math) {
407 unsigned short control_word;
408
409 printk("Checking 386/387 coupling... ");
410 timer_table[COPRO_TIMER].expires = jiffies+50;
411 timer_table[COPRO_TIMER].fn = copro_timeout;
412 timer_active |= 1<<COPRO_TIMER;
413 __asm__("clts ; fninit ; fnstcw %0 ; fwait":"=m" (*&control_word));
414 control_word &= 0xffc0;
415 __asm__("fldcw %0 ; fwait": :"m" (*&control_word));
416 outb_p(inb_p(0x21) | (1 << 2), 0x21);
417 __asm__("fldz ; fld1 ; fdiv %st,%st(1) ; fwait");
418 timer_active &= ~(1<<COPRO_TIMER);
419 if (!fpu_error)
420 printk("Ok, fpu using %s error reporting.\n",
421 ignore_irq13?"exception 16":"irq13");
422 }
423 #ifndef CONFIG_MATH_EMULATION
424 else {
425 printk("No coprocessor found and no math emulation present.\n");
426 printk("Giving up.\n");
427 for (;;) ;
428 }
429 #endif
430
431 system_utsname.machine[1] = '0' + x86;
432 printk(linux_banner);
433
434 move_to_user_mode();
435 if (!fork())
436 init();
437
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443
444
445
446 for(;;)
447 idle();
448 }
449
450 static int printf(const char *fmt, ...)
451 {
452 va_list args;
453 int i;
454
455 va_start(args, fmt);
456 write(1,printbuf,i=vsprintf(printbuf, fmt, args));
457 va_end(args);
458 return i;
459 }
460
461 void init(void)
462 {
463 int pid,i;
464
465 setup((void *) &drive_info);
466 sprintf(term, "TERM=con%dx%d", ORIG_VIDEO_COLS, ORIG_VIDEO_LINES);
467 (void) open("/dev/tty1",O_RDWR,0);
468 (void) dup(0);
469 (void) dup(0);
470
471 execve("/etc/init",argv_init,envp_init);
472 execve("/bin/init",argv_init,envp_init);
473 execve("/sbin/init",argv_init,envp_init);
474
475
476 if (!(pid=fork())) {
477 close(0);
478 if (open("/etc/rc",O_RDONLY,0))
479 _exit(1);
480 execve("/bin/sh",argv_rc,envp_rc);
481 _exit(2);
482 }
483 if (pid>0)
484 while (pid != wait(&i))
485 ;
486 while (1) {
487 if ((pid = fork()) < 0) {
488 printf("Fork failed in init\n\r");
489 continue;
490 }
491 if (!pid) {
492 close(0);close(1);close(2);
493 setsid();
494 (void) open("/dev/tty1",O_RDWR,0);
495 (void) dup(0);
496 (void) dup(0);
497 _exit(execve("/bin/sh",argv,envp));
498 }
499 while (1)
500 if (pid == wait(&i))
501 break;
502 printf("\n\rchild %d died with code %04x\n\r",pid,i);
503 sync();
504 }
505 _exit(0);
506 }