4.3BSD - /usr/src/sys/stand/bootra.c

   1: /*
   2:  * Copyright (c) 1982, 1986 Regents of the University of California.
   3:  * All rights reserved.  The Berkeley software License Agreement
   4:  * specifies the terms and conditions for redistribution.
   5:  *
   6:  *	@(#)bootra.c	7.1 (Berkeley) 6/5/86
   7:  */
   8: 
   9: #include "../h/param.h"
  10: #include "../h/inode.h"
  11: #include "../h/fs.h"
  12: #include "../h/vm.h"
  13: #include <a.out.h>
  14: #include "saio.h"
  15: #include "../h/reboot.h"
  16: 
  17: char bootprog[20] = "ra(0,0)boot";
  18: 
  19: /*
  20:  * Boot program... arguments passed in r10 and r11
  21:  * are passed through to the full boot program.
  22:  */
  23: 
  24: main()
  25: {
  26:     register unsigned howto, devtype;   /* howto=r11, devtype=r10 */
  27:     int io, unit, partition;
  28:     register char *cp;
  29: 
  30: #ifdef lint
  31:     howto = 0; devtype = 0;
  32: #endif
  33:     unit = (devtype >> B_UNITSHIFT) & B_UNITMASK;
  34:     unit += 8 * ((devtype >> B_ADAPTORSHIFT) & B_ADAPTORMASK);
  35:     partition = (devtype >> B_PARTITIONSHIFT) & B_PARTITIONMASK;
  36:     cp = bootprog + 3;
  37:     if (unit >= 10)
  38:         *cp++ = unit / 10 + '0';
  39:     *cp++ = unit % 10 + '0';
  40:     *cp++ = ',';
  41:     if (partition >= 10)
  42:         *cp++ = partition / 10 + '0';
  43:     *cp++ = partition % 10 + '0';
  44:     bcopy((caddr_t) ")boot", cp, 6);
  45:     printf("loading %s\n", bootprog);
  46:     io = open(bootprog, 0);
  47:     if (io >= 0)
  48:         copyunix(howto, devtype, io);
  49:     _stop("boot failed\n");
  50: }
  51: 
  52: /*ARGSUSED*/
  53: copyunix(howto, devtype, io)
  54:     register howto, devtype, io;    /* howto=r11, devtype=r10 */
  55: {
  56:     struct exec x;
  57:     register int i;
  58:     char *addr;
  59: 
  60:     i = read(io, (char *)&x, sizeof x);
  61:     if (i != sizeof x ||
  62:         (x.a_magic != 0407 && x.a_magic != 0413 && x.a_magic != 0410))
  63:         _stop("Bad format\n");
  64:     if ((x.a_magic == 0413 || x.a_magic == 0410) &&
  65:         lseek(io, 0x400, 0) == -1)
  66:         goto shread;
  67:     if (read(io, (char *)0, x.a_text) != x.a_text)
  68:         goto shread;
  69:     addr = (char *)x.a_text;
  70:     if (x.a_magic == 0413 || x.a_magic == 0410)
  71:         while ((int)addr & CLOFSET)
  72:             *addr++ = 0;
  73:     if (read(io, addr, x.a_data) != x.a_data)
  74:         goto shread;
  75:     addr += x.a_data;
  76:     x.a_bss += 128*512; /* slop */
  77:     for (i = 0; i < x.a_bss; i++)
  78:         *addr++ = 0;
  79:     x.a_entry &= 0x7fffffff;
  80:     (*((int (*)()) x.a_entry))();
  81:     return;
  82: shread:
  83:     _stop("Short read\n");
  84: }

Defined functions

Defined variables