BSD 4_1_snap development

[unix-history] / sys / stand / boot.c.ancient

/*      boot.c  4.4     81/03/22        */

#include "../h/param.h"
#include "../h/ino.h"
#include "../h/inode.h"
#include "../h/filsys.h"
#include "../h/dir.h"
#include "../h/vm.h"
#include <a.out.h>
#include "saio.h"
#include <sys/reboot.h>

/*
* Boot program... arguments passed in r10 and r11 determine
* whether boot stops to ask for system name and which device
* boot comes from.
*/

/* Types in r10 specifying major device */
char    devname[][2] = {
       'h','p',        /* 0 = hp */
       0,0,            /* 1 = ht */
       'u','p',        /* 2 = up */
       'h','k',        /* 3 = hk */
};

char line[100] = "xx(0,0)vmunix";

int     retry = 0;

main()
{
       register howto, devtype;        /* howto=r11, devtype=r10 */
       int io;

#ifdef lint
       howto = 0; devtype = 0;
#endif
       printf("\nBoot\n");
#ifdef JUSTASK
       howto = RB_ASKNAME|RB_SINGLE;
#else
       if ((howto&RB_ASKNAME)==0) {
               if (devtype>=0 && devtype<sizeof(devname)/2
                   && devname[devtype][0]) {
                       line[0] = devname[devtype][0];
                       line[1] = devname[devtype][1];
               } else
                       howto = RB_SINGLE|RB_ASKNAME;
       }
#endif
       for (;;) {
               if (howto & RB_ASKNAME) {
                       printf(": ");
                       gets(line);
               } else
                       printf(": %s\n", line);
               io = open(line, 0);
               if (io >= 0)
                       copyunix(howto, io);
               if (++retry > 2)
                       howto = RB_SINGLE|RB_ASKNAME;
       }
}

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

       i = read(io, (char *)&x, sizeof x);
       if (i != sizeof x || x.a_magic != 0410)
               _stop("Bad format\n");
       printf("%d", x.a_text);
       if (read(io, (char *)0, x.a_text) != x.a_text)
               goto shread;
       addr = (char *)x.a_text;
       while ((int)addr & CLOFSET)
               *addr++ = 0;
       printf("+%d", x.a_data);
       if (read(io, addr, x.a_data) != x.a_data)
               goto shread;
       addr += x.a_data;
       printf("+%d", x.a_bss);
       x.a_bss += 128*512;     /* slop */
       for (i = 0; i < x.a_bss; i++)
               *addr++ = 0;
       x.a_entry &= 0x7fffffff;
       printf(" start 0x%x\n", x.a_entry);
       (*((int (*)()) x.a_entry))();
       _exit();
shread:
       _stop("Short read\n");
}