1 /* boot.c 4.3 81/03/16 */ 2 3 #include "../h/param.h" 4 #include "../h/ino.h" 5 #include "../h/inode.h" 6 #include "../h/filsys.h" 7 #include "../h/dir.h" 8 #include "../h/vm.h" 9 #include <a.out.h> 10 #include "saio.h" 11 #include <sys/reboot.h> 12 13 /* 14 * Boot program... arguments passed in r10 and r11 determine 15 * whether boot stops to ask for system name and which device 16 * boot comes from. 17 */ 18 19 /* Types in r10 specifying major device */ 20 char devname[][2] = { 21 'h','p', /* 0 = hp */ 22 0,0, /* 1 = ht */ 23 'u','p', /* 2 = up */ 24 'h','k', /* 3 = hk */ 25 }; 26 27 char line[100] = "xx(0,0)vmunix"; 28 29 main() 30 { 31 register howto, devtype; /* howto=r11, devtype=r10 */ 32 int io, retry; 33 34 #ifdef lint 35 howto = 0; devtype = 0; 36 #endif 37 printf("\nBoot\n"); 38 #ifdef JUSTASK 39 howto = RB_ASKNAME|RB_SINGLE; 40 #else 41 if ((howto&RB_ASKNAME)==0) { 42 if (devtype>=0 && devtype<sizeof(devname)/2 43 && devname[devtype][0]) { 44 line[0] = devname[devtype][0]; 45 line[1] = devname[devtype][1]; 46 } else 47 howto = RB_SINGLE|RB_ASKNAME; 48 } 49 #endif 50 retry = 0; 51 for (;;) { 52 if (howto & RB_ASKNAME) { 53 printf(": "); 54 gets(line); 55 } else 56 printf(": %s\n", line); 57 io = open(line, 0); 58 if (io >= 0) 59 copyunix(io); 60 if (++retry > 2) 61 howto = RB_SINGLE|RB_ASKNAME; 62 } 63 } 64 65 copyunix(io) 66 register io; 67 { 68 struct exec x; 69 register int i; 70 char *addr; 71 72 i = read(io, (char *)&x, sizeof x); 73 if (i != sizeof x || x.a_magic != 0410) 74 _stop("Bad format\n"); 75 printf("%d", x.a_text); 76 if (read(io, (char *)0, x.a_text) != x.a_text) 77 goto shread; 78 addr = (char *)x.a_text; 79 while ((int)addr & CLOFSET) 80 *addr++ = 0; 81 printf("+%d", x.a_data); 82 if (read(io, addr, x.a_data) != x.a_data) 83 goto shread; 84 addr += x.a_data; 85 printf("+%d", x.a_bss); 86 x.a_bss += 128*512; /* slop */ 87 for (i = 0; i < x.a_bss; i++) 88 *addr++ = 0; 89 x.a_entry &= 0x7fffffff; 90 printf(" start 0x%x\n", x.a_entry); 91 (*((int (*)()) x.a_entry))(); 92 _exit(); 93 shread: 94 _stop("Short read\n"); 95 } 96