1 /* boot.c 4.2 81/03/15 */ 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 printf("\nBoot\n"); 35 #ifdef JUSTASK 36 howto = RB_ASKNAME|RB_SINGLE; 37 #else 38 if ((howto&RB_ASKNAME)==0) { 39 if (devtype>=0 && devtype<sizeof(devname)/2 40 && devname[devtype][0]) { 41 line[0] = devname[devtype][0]; 42 line[1] = devname[devtype][1]; 43 } else 44 howto = RB_SINGLE|RB_ASKNAME; 45 } 46 #endif 47 retry = 0; 48 for (;;) { 49 if (howto & RB_ASKNAME) { 50 printf(": "); 51 gets(line); 52 } else 53 printf(": %s\n", line); 54 io = open(line, 0); 55 if (io >= 0) 56 copyunix(howto, io); 57 if (++retry > 2) 58 howto = RB_SINGLE|RB_ASKNAME; 59 } 60 } 61 62 copyunix(howto, io) 63 register howto, io; 64 { 65 struct exec x; 66 register int i; 67 char *addr; 68 69 i = read(io, (char *)&x, sizeof x); 70 if (i != sizeof x || x.a_magic != 0410) 71 _stop("Bad format\n"); 72 printf("%d", x.a_text); 73 if (read(io, (char *)0, x.a_text) != x.a_text) 74 goto shread; 75 addr = (char *)x.a_text; 76 while ((int)addr & CLOFSET) 77 *addr++ = 0; 78 printf("+%d", x.a_data); 79 if (read(io, addr, x.a_data) != x.a_data) 80 goto shread; 81 addr += x.a_data; 82 printf("+%d", x.a_bss); 83 x.a_bss += 128*512; /* slop */ 84 for (i = 0; i < x.a_bss; i++) 85 *addr++ = 0; 86 x.a_entry &= 0x7fffffff; 87 printf(" start 0x%x\n", x.a_entry); 88 (*((int (*)()) x.a_entry))(); 89 _exit(); 90 shread: 91 _stop("Short read\n"); 92 } 93