1 /* boot.c 4.4 81/03/22 */ 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 int retry = 0; 30 31 main() 32 { 33 register howto, devtype; /* howto=r11, devtype=r10 */ 34 int io; 35 36 #ifdef lint 37 howto = 0; devtype = 0; 38 #endif 39 printf("\nBoot\n"); 40 #ifdef JUSTASK 41 howto = RB_ASKNAME|RB_SINGLE; 42 #else 43 if ((howto&RB_ASKNAME)==0) { 44 if (devtype>=0 && devtype<sizeof(devname)/2 45 && devname[devtype][0]) { 46 line[0] = devname[devtype][0]; 47 line[1] = devname[devtype][1]; 48 } else 49 howto = RB_SINGLE|RB_ASKNAME; 50 } 51 #endif 52 for (;;) { 53 if (howto & RB_ASKNAME) { 54 printf(": "); 55 gets(line); 56 } else 57 printf(": %s\n", line); 58 io = open(line, 0); 59 if (io >= 0) 60 copyunix(howto, io); 61 if (++retry > 2) 62 howto = RB_SINGLE|RB_ASKNAME; 63 } 64 } 65 66 /*ARGSUSED*/ 67 copyunix(howto, io) 68 register howto, io; 69 { 70 struct exec x; 71 register int i; 72 char *addr; 73 74 i = read(io, (char *)&x, sizeof x); 75 if (i != sizeof x || x.a_magic != 0410) 76 _stop("Bad format\n"); 77 printf("%d", x.a_text); 78 if (read(io, (char *)0, x.a_text) != x.a_text) 79 goto shread; 80 addr = (char *)x.a_text; 81 while ((int)addr & CLOFSET) 82 *addr++ = 0; 83 printf("+%d", x.a_data); 84 if (read(io, addr, x.a_data) != x.a_data) 85 goto shread; 86 addr += x.a_data; 87 printf("+%d", x.a_bss); 88 x.a_bss += 128*512; /* slop */ 89 for (i = 0; i < x.a_bss; i++) 90 *addr++ = 0; 91 x.a_entry &= 0x7fffffff; 92 printf(" start 0x%x\n", x.a_entry); 93 (*((int (*)()) x.a_entry))(); 94 _exit(); 95 shread: 96 _stop("Short read\n"); 97 } 98