BSD 4_3 release

[unix-history] / usr / src / sys / stand / bootra.c

/*
* Copyright (c) 1982, 1986 Regents of the University of California.
* All rights reserved.  The Berkeley software License Agreement
* specifies the terms and conditions for redistribution.
*
*      @(#)bootra.c    7.1 (Berkeley) 6/5/86
*/

#include "../h/param.h"
#include "../h/inode.h"
#include "../h/fs.h"
#include "../h/vm.h"
#include <a.out.h>
#include "saio.h"
#include "../h/reboot.h"

char bootprog[20] = "ra(0,0)boot";

/*
* Boot program... arguments passed in r10 and r11
* are passed through to the full boot program.
*/

main()
{
       register unsigned howto, devtype;       /* howto=r11, devtype=r10 */
       int io, unit, partition;
       register char *cp;

#ifdef lint
       howto = 0; devtype = 0;
#endif
       unit = (devtype >> B_UNITSHIFT) & B_UNITMASK;
       unit += 8 * ((devtype >> B_ADAPTORSHIFT) & B_ADAPTORMASK);
       partition = (devtype >> B_PARTITIONSHIFT) & B_PARTITIONMASK;
       cp = bootprog + 3;
       if (unit >= 10)
               *cp++ = unit / 10 + '0';
       *cp++ = unit % 10 + '0';
       *cp++ = ',';
       if (partition >= 10)
               *cp++ = partition / 10 + '0';
       *cp++ = partition % 10 + '0';
       bcopy((caddr_t) ")boot", cp, 6);
       printf("loading %s\n", bootprog);
       io = open(bootprog, 0);
       if (io >= 0)
               copyunix(howto, devtype, io);
       _stop("boot failed\n");
}

/*ARGSUSED*/
copyunix(howto, devtype, io)
       register howto, devtype, io;    /* howto=r11, devtype=r10 */
{
       struct exec x;
       register int i;
       char *addr;

       i = read(io, (char *)&x, sizeof x);
       if (i != sizeof x ||
           (x.a_magic != 0407 && x.a_magic != 0413 && x.a_magic != 0410))
               _stop("Bad format\n");
       if ((x.a_magic == 0413 || x.a_magic == 0410) &&
           lseek(io, 0x400, 0) == -1)
               goto shread;
       if (read(io, (char *)0, x.a_text) != x.a_text)
               goto shread;
       addr = (char *)x.a_text;
       if (x.a_magic == 0413 || x.a_magic == 0410)
               while ((int)addr & CLOFSET)
                       *addr++ = 0;
       if (read(io, addr, x.a_data) != x.a_data)
               goto shread;
       addr += x.a_data;
       x.a_bss += 128*512;     /* slop */
       for (i = 0; i < x.a_bss; i++)
               *addr++ = 0;
       x.a_entry &= 0x7fffffff;
       (*((int (*)()) x.a_entry))();
       return;
shread:
       _stop("Short read\n");
}