This source file includes following definitions.
- _syscall0
- time_init
- start_kernel
- printf
- init
1
2
3
4
5
6
7 #define __LIBRARY__
8 #include <unistd.h>
9 #include <time.h>
10
11
12
13
14
15
16
17
18
19
20
21
22
23 static inline _syscall0(int,fork)
24 static inline _syscall0(int,pause)
25 static inline _syscall1(int,setup,void *,BIOS)
26 static inline _syscall0(int,sync)
27
28 #include <linux/tty.h>
29 #include <linux/sched.h>
30 #include <linux/head.h>
31 #include <asm/system.h>
32 #include <asm/io.h>
33
34 #include <stddef.h>
35 #include <stdarg.h>
36 #include <unistd.h>
37 #include <fcntl.h>
38 #include <sys/types.h>
39
40 #include <linux/fs.h>
41
42 #include <string.h>
43
44 static char printbuf[1024];
45
46 extern char *strcpy();
47 extern int vsprintf();
48 extern void init(void);
49 extern void blk_dev_init(void);
50 extern void chr_dev_init(void);
51 extern void hd_init(void);
52 extern void floppy_init(void);
53 extern void mem_init(long start, long end);
54 extern long rd_init(long mem_start, int length);
55 extern long kernel_mktime(struct tm * tm);
56
57 static int sprintf(char * str, const char *fmt, ...)
58 {
59 va_list args;
60 int i;
61
62 va_start(args, fmt);
63 i = vsprintf(str, fmt, args);
64 va_end(args);
65 return i;
66 }
67
68
69
70
71 #define EXT_MEM_K (*(unsigned short *)0x90002)
72 #define CON_ROWS ((*(unsigned short *)0x9000e) & 0xff)
73 #define CON_COLS (((*(unsigned short *)0x9000e) & 0xff00) >> 8)
74 #define DRIVE_INFO (*(struct drive_info *)0x90080)
75 #define ORIG_ROOT_DEV (*(unsigned short *)0x901FC)
76
77
78
79
80
81
82
83
84 #define CMOS_READ(addr) ({ \
85 outb_p(0x80|addr,0x70); \
86 inb_p(0x71); \
87 })
88
89 #define BCD_TO_BIN(val) ((val)=((val)&15) + ((val)>>4)*10)
90
91 static void time_init(void)
92 {
93 struct tm time;
94
95 do {
96 time.tm_sec = CMOS_READ(0);
97 time.tm_min = CMOS_READ(2);
98 time.tm_hour = CMOS_READ(4);
99 time.tm_mday = CMOS_READ(7);
100 time.tm_mon = CMOS_READ(8);
101 time.tm_year = CMOS_READ(9);
102 } while (time.tm_sec != CMOS_READ(0));
103 BCD_TO_BIN(time.tm_sec);
104 BCD_TO_BIN(time.tm_min);
105 BCD_TO_BIN(time.tm_hour);
106 BCD_TO_BIN(time.tm_mday);
107 BCD_TO_BIN(time.tm_mon);
108 BCD_TO_BIN(time.tm_year);
109 time.tm_mon--;
110 startup_time = kernel_mktime(&time);
111 }
112
113 static long memory_end = 0;
114 static long buffer_memory_end = 0;
115 static long main_memory_start = 0;
116 static char term[32];
117
118 static char * argv_init[] = { "/bin/init", NULL };
119 static char * envp_init[] = { "HOME=/", NULL, NULL };
120
121 static char * argv_rc[] = { "/bin/sh", NULL };
122 static char * envp_rc[] = { "HOME=/", NULL ,NULL };
123
124 static char * argv[] = { "-/bin/sh",NULL };
125 static char * envp[] = { "HOME=/usr/root", NULL, NULL };
126
127 struct drive_info { char dummy[32]; } drive_info;
128
129 void start_kernel(void)
130 {
131
132
133
134
135 ROOT_DEV = ORIG_ROOT_DEV;
136 sprintf(term, "TERM=con%dx%d", CON_COLS, CON_ROWS);
137 envp[1] = term;
138 envp_rc[1] = term;
139 envp_init[1] = term;
140 drive_info = DRIVE_INFO;
141 memory_end = (1<<20) + (EXT_MEM_K<<10);
142 memory_end &= 0xfffff000;
143 if (memory_end > 16*1024*1024)
144 memory_end = 16*1024*1024;
145 if (memory_end >= 12*1024*1024)
146 buffer_memory_end = 4*1024*1024;
147 else if (memory_end >= 6*1024*1024)
148 buffer_memory_end = 2*1024*1024;
149 else if (memory_end >= 4*1024*1024)
150 buffer_memory_end = 3*512*1024;
151 else
152 buffer_memory_end = 1*1024*1024;
153 main_memory_start = buffer_memory_end;
154 #ifdef RAMDISK
155 main_memory_start += rd_init(main_memory_start, RAMDISK*1024);
156 #endif
157 mem_init(main_memory_start,memory_end);
158 trap_init();
159 blk_dev_init();
160 chr_dev_init();
161 tty_init();
162 time_init();
163 sched_init();
164 buffer_init(buffer_memory_end);
165 hd_init();
166 floppy_init();
167 sti();
168 move_to_user_mode();
169 if (!fork()) {
170 init();
171 }
172
173
174
175
176
177
178
179 for(;;)
180 __asm__("int $0x80"::"a" (__NR_pause):"ax");
181 }
182
183 static int printf(const char *fmt, ...)
184 {
185 va_list args;
186 int i;
187
188 va_start(args, fmt);
189 write(1,printbuf,i=vsprintf(printbuf, fmt, args));
190 va_end(args);
191 return i;
192 }
193
194 void init(void)
195 {
196 int pid,i;
197
198 setup((void *) &drive_info);
199 (void) open("/dev/tty1",O_RDWR,0);
200 (void) dup(0);
201 (void) dup(0);
202 printf("%d buffers = %d bytes buffer space\n\r",NR_BUFFERS,
203 NR_BUFFERS*BLOCK_SIZE);
204 printf("Free mem: %d bytes\n\r",memory_end-main_memory_start);
205
206 execve("/etc/init",argv_init,envp_init);
207 execve("/bin/init",argv_init,envp_init);
208
209
210 if (!(pid=fork())) {
211 close(0);
212 if (open("/etc/rc",O_RDONLY,0))
213 _exit(1);
214 execve("/bin/sh",argv_rc,envp_rc);
215 _exit(2);
216 }
217 if (pid>0)
218 while (pid != wait(&i))
219 ;
220 while (1) {
221 if ((pid=fork())<0) {
222 printf("Fork failed in init\r\n");
223 continue;
224 }
225 if (!pid) {
226 close(0);close(1);close(2);
227 setsid();
228 (void) open("/dev/tty1",O_RDWR,0);
229 (void) dup(0);
230 (void) dup(0);
231 _exit(execve("/bin/sh",argv,envp));
232 }
233 while (1)
234 if (pid == wait(&i))
235 break;
236 printf("\n\rchild %d died with code %04x\n\r",pid,i);
237 sync();
238 }
239 _exit(0);
240 }