This source file includes following definitions.
- _syscall0
- time_init
- 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/mktime.h>
13 #include <linux/types.h>
14 #include <linux/fcntl.h>
15 #include <linux/config.h>
16 #include <linux/sched.h>
17 #include <linux/tty.h>
18 #include <linux/head.h>
19 #include <linux/unistd.h>
20 #include <linux/string.h>
21 #include <linux/timer.h>
22 #include <linux/fs.h>
23
24 extern unsigned long * prof_buffer;
25 extern unsigned long prof_len;
26 extern char edata, end;
27 extern char *linux_banner;
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40
41 static inline _syscall0(int,idle)
42 static inline _syscall0(int,fork)
43 static inline _syscall0(int,pause)
44 static inline _syscall1(int,setup,void *,BIOS)
45 static inline _syscall0(int,sync)
46 static inline _syscall0(pid_t,setsid)
47 static inline _syscall3(int,write,int,fd,const char *,buf,off_t,count)
48 static inline _syscall1(int,dup,int,fd)
49 static inline _syscall3(int,execve,const char *,file,char **,argv,char **,envp)
50 static inline _syscall3(int,open,const char *,file,int,flag,int,mode)
51 static inline _syscall1(int,close,int,fd)
52 static inline _syscall3(pid_t,waitpid,pid_t,pid,int *,wait_stat,int,options)
53
54 static inline pid_t wait(int * wait_stat)
55 {
56 return waitpid(-1,wait_stat,0);
57 }
58
59 static char printbuf[1024];
60
61 extern char empty_zero_page[4096];
62 extern int vsprintf(char *,const char *,va_list);
63 extern void init(void);
64 extern void init_IRQ(void);
65 extern long blk_dev_init(long,long);
66 extern long chr_dev_init(long,long);
67 extern void floppy_init(void);
68 extern void sock_init(void);
69 extern long rd_init(long mem_start, int length);
70 extern long kernel_mktime(struct mktime * time);
71 extern unsigned long simple_strtoul(const char *cp,char **endp,unsigned int
72 base);
73
74 #ifdef CONFIG_SYSVIPC
75 extern void ipc_init(void);
76 #endif
77 #ifdef CONFIG_SCSI
78 extern unsigned long scsi_dev_init(unsigned long, unsigned long);
79 #endif
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83
84 #define PARAM empty_zero_page
85 #define EXT_MEM_K (*(unsigned short *) (PARAM+2))
86 #define DRIVE_INFO (*(struct drive_info *) (PARAM+0x80))
87 #define SCREEN_INFO (*(struct screen_info *) (PARAM+0))
88 #define MOUNT_ROOT_RDONLY (*(unsigned short *) (PARAM+0x1F2))
89 #define RAMDISK_SIZE (*(unsigned short *) (PARAM+0x1F8))
90 #define ORIG_ROOT_DEV (*(unsigned short *) (PARAM+0x1FC))
91 #define AUX_DEVICE_INFO (*(unsigned char *) (PARAM+0x1FF))
92
93
94
95
96 #define MAX_INIT_ARGS 8
97 #define MAX_INIT_ENVS 8
98 #define COMMAND_LINE ((char *) (PARAM+2048))
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106
107 #define CMOS_READ(addr) ({ \
108 outb_p(addr,0x70); \
109 inb_p(0x71); \
110 })
111
112 #define BCD_TO_BIN(val) ((val)=((val)&15) + ((val)>>4)*10)
113
114 static void time_init(void)
115 {
116 struct mktime time;
117 int i;
118
119 for (i = 0 ; i < 1000000 ; i++)
120 if (!(CMOS_READ(10) & 0x80))
121 break;
122 do {
123 time.sec = CMOS_READ(0);
124 time.min = CMOS_READ(2);
125 time.hour = CMOS_READ(4);
126 time.day = CMOS_READ(7);
127 time.mon = CMOS_READ(8);
128 time.year = CMOS_READ(9);
129 } while (time.sec != CMOS_READ(0));
130 BCD_TO_BIN(time.sec);
131 BCD_TO_BIN(time.min);
132 BCD_TO_BIN(time.hour);
133 BCD_TO_BIN(time.day);
134 BCD_TO_BIN(time.mon);
135 BCD_TO_BIN(time.year);
136 time.mon--;
137 startup_time = kernel_mktime(&time);
138 }
139
140 static unsigned long memory_start = 0;
141
142 static unsigned long memory_end = 0;
143 static unsigned long low_memory_start = 0;
144
145 static char * argv_init[MAX_INIT_ARGS+2] = { "init", NULL, };
146 static char * envp_init[MAX_INIT_ENVS+2] = { "HOME=/", "TERM=console", NULL, };
147
148 static char * argv_rc[] = { "/bin/sh", NULL };
149 static char * envp_rc[] = { "HOME=/", "TERM=console", NULL };
150
151 static char * argv[] = { "-/bin/sh",NULL };
152 static char * envp[] = { "HOME=/usr/root", "TERM=console", NULL };
153
154 struct drive_info { char dummy[32]; } drive_info;
155 struct screen_info screen_info;
156
157 unsigned char aux_device_present;
158 int ramdisk_size;
159 int root_mountflags = 0;
160
161 static char fpu_error = 0;
162
163 static char command_line[80] = { 0, };
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175
176 static void parse_options(char *line)
177 {
178 char *next;
179 int args, envs;
180
181 if (!*line)
182 return;
183 args = 0;
184 envs = 1;
185 next = line;
186 while ((line = next) != NULL) {
187 if ((next = strchr(line,' ')) != NULL)
188 *next++ = 0;
189
190
191
192 if (!strncmp(line,"root=",5)) {
193 ROOT_DEV = simple_strtoul(line+5,NULL,16);
194 continue;
195 }
196 if (!strcmp(line,"ro")) {
197 root_mountflags |= MS_RDONLY;
198 continue;
199 }
200 if (!strcmp(line,"rw")) {
201 root_mountflags &= ~MS_RDONLY;
202 continue;
203 }
204 if (!strcmp(line,"no387")) {
205 hard_math = 0;
206 __asm__("movl %%cr0,%%eax\n\t"
207 "andl $0xFFFFFFF9,%%eax\n\t"
208 "orl $0x4,%%eax\n\t"
209 "movl %%eax,%%cr0\n\t" ::: "ax");
210 continue;
211 }
212
213
214
215
216 if (strchr(line,'=')) {
217 if (envs >= MAX_INIT_ENVS)
218 break;
219 envp_init[++envs] = line;
220 } else {
221 if (args >= MAX_INIT_ARGS)
222 break;
223 argv_init[++args] = line;
224 }
225 }
226 argv_init[args+1] = NULL;
227 envp_init[envs+1] = NULL;
228 }
229
230 static void copro_timeout(void)
231 {
232 fpu_error = 1;
233 timer_table[COPRO_TIMER].expires = jiffies+100;
234 timer_active |= 1<<COPRO_TIMER;
235 printk("387 failed: trying to reset\n");
236 send_sig(SIGFPE, last_task_used_math, 1);
237 outb_p(0,0xf1);
238 outb_p(0,0xf0);
239 }
240
241 void start_kernel(void)
242 {
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247 ROOT_DEV = ORIG_ROOT_DEV;
248 drive_info = DRIVE_INFO;
249 screen_info = SCREEN_INFO;
250 aux_device_present = AUX_DEVICE_INFO;
251 memory_end = (1<<20) + (EXT_MEM_K<<10);
252 memory_end &= 0xfffff000;
253 ramdisk_size = RAMDISK_SIZE;
254 strcpy(command_line,COMMAND_LINE);
255 #ifdef CONFIG_MAX_16M
256 if (memory_end > 16*1024*1024)
257 memory_end = 16*1024*1024;
258 #endif
259 if (MOUNT_ROOT_RDONLY)
260 root_mountflags |= MS_RDONLY;
261 if ((unsigned long)&end >= (1024*1024)) {
262 memory_start = (unsigned long) &end;
263 low_memory_start = 4096;
264 } else {
265 memory_start = 1024*1024;
266 low_memory_start = (unsigned long) &end;
267 }
268 low_memory_start += 0xfff;
269 low_memory_start &= 0xfffff000;
270 memory_start = paging_init(memory_start,memory_end);
271 trap_init();
272 init_IRQ();
273 sched_init();
274 parse_options(command_line);
275 #ifdef CONFIG_PROFILE
276 prof_buffer = (unsigned long *) memory_start;
277 prof_len = (unsigned long) &end;
278 prof_len >>= 2;
279 memory_start += prof_len * sizeof(unsigned long);
280 #endif
281 memory_start = chr_dev_init(memory_start,memory_end);
282 memory_start = blk_dev_init(memory_start,memory_end);
283 #ifdef CONFIG_SCSI
284 memory_start = scsi_dev_init(memory_start,memory_end);
285 #endif
286 memory_start = inode_init(memory_start,memory_end);
287 memory_start = file_table_init(memory_start,memory_end);
288 mem_init(low_memory_start,memory_start,memory_end);
289 buffer_init();
290 time_init();
291 floppy_init();
292 sock_init();
293 #ifdef CONFIG_SYSVIPC
294 ipc_init();
295 #endif
296 sti();
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306 if (hard_math) {
307 unsigned short control_word;
308
309 timer_table[COPRO_TIMER].expires = jiffies+50;
310 timer_table[COPRO_TIMER].fn = copro_timeout;
311 timer_active |= 1<<COPRO_TIMER;
312 printk("You have a bad 386/387 coupling.\r");
313 __asm__("clts ; fninit ; fnstcw %0 ; fwait":"=m" (*&control_word));
314 control_word &= 0xffc0;
315 __asm__("fldcw %0 ; fwait"::"m" (*&control_word));
316 outb_p(inb_p(0x21) | (1 << 2), 0x21);
317 __asm__("fldz ; fld1 ; fdiv %st,%st(1) ; fwait");
318 timer_active &= ~(1<<COPRO_TIMER);
319 if (!fpu_error)
320 printk("Math coprocessor using %s error reporting.\n",
321 ignore_irq13?"exception 16":"irq13");
322 }
323 move_to_user_mode();
324 if (!fork())
325 init();
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334
335 for(;;)
336 idle();
337 }
338
339 static int printf(const char *fmt, ...)
340 {
341 va_list args;
342 int i;
343
344 va_start(args, fmt);
345 write(1,printbuf,i=vsprintf(printbuf, fmt, args));
346 va_end(args);
347 return i;
348 }
349
350 void init(void)
351 {
352 int pid,i;
353
354 setup((void *) &drive_info);
355 (void) open("/dev/tty1",O_RDWR,0);
356 (void) dup(0);
357 (void) dup(0);
358
359 printf(linux_banner);
360 execve("/etc/init",argv_init,envp_init);
361 execve("/bin/init",argv_init,envp_init);
362 execve("/sbin/init",argv_init,envp_init);
363
364
365 if (!(pid=fork())) {
366 close(0);
367 if (open("/etc/rc",O_RDONLY,0))
368 _exit(1);
369 execve("/bin/sh",argv_rc,envp_rc);
370 _exit(2);
371 }
372 if (pid>0)
373 while (pid != wait(&i))
374 ;
375 while (1) {
376 if ((pid = fork()) < 0) {
377 printf("Fork failed in init\n\r");
378 continue;
379 }
380 if (!pid) {
381 close(0);close(1);close(2);
382 setsid();
383 (void) open("/dev/tty1",O_RDWR,0);
384 (void) dup(0);
385 (void) dup(0);
386 _exit(execve("/bin/sh",argv,envp));
387 }
388 while (1)
389 if (pid == wait(&i))
390 break;
391 printf("\n\rchild %d died with code %04x\n\r",pid,i);
392 sync();
393 }
394 _exit(0);
395 }