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[unix-history] / usr / src / sys / vax / stand / boot.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.
*
*      @(#)boot.c      7.11 (Berkeley) %G%
*/

#include "param.h"
#include "inode.h"
#include "fs.h"
#include "vm.h"
#include "reboot.h"

#include <a.out.h>
#include "saio.h"

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

char line[100];

extern  unsigned opendev;

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

#ifdef lint
       howto = 0; devtype = 0;
#endif
       printf("\nBoot\n");
#ifdef JUSTASK
       howto = RB_ASKNAME|RB_SINGLE;
#else
       if ((howto & RB_ASKNAME) == 0) {
               type = (devtype >> B_TYPESHIFT) & B_TYPEMASK;
               if ((unsigned)type < ndevs && devsw[type].dv_name)
                       strcpy(line, UNIX);
               else
                       howto |= RB_SINGLE|RB_ASKNAME;
       }
#endif
       for (retry = 0;;) {
               if (howto & RB_ASKNAME) {
                       printf(": ");
                       gets(line);
                       if (line[0] == 0) {
                               strcpy(line, UNIX);
                               printf(": %s\n", line);
                       }
               } else
                       printf(": %s\n", line);
               io = open(line, 0);
               if (io >= 0) {
#ifdef VAX750
                       loadpcs();
#endif
                       copyunix(howto, opendev, io);
                       close(io);
                       howto |= RB_SINGLE|RB_ASKNAME;
               }
               if (++retry > 2)
                       howto |= RB_SINGLE|RB_ASKNAME;
       }
}

/*ARGSUSED*/
copyunix(howto, devtype, aio)
       register howto, devtype;        /* howto=r11, devtype=r10 */
       int aio;
{
       register int esym;              /* must be r9 */
       struct exec x;
       register int io = aio, i;
       char *addr;

       if (read(io, (char *)&x, sizeof(x)) != sizeof(x) || N_BADMAG(x)) {
               printf("bad magic #\n");
               return;
       }
       printf("%d", x.a_text);
       if (x.a_magic == ZMAGIC && lseek(io, 0x400, L_SET) == -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 == ZMAGIC || x.a_magic == NMAGIC)
               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);
       for (i = 0; i < x.a_bss; i++)
               *addr++ = 0;
       if (howto & RB_KDB && x.a_syms) {
               *(int *)addr = x.a_syms;                /* symbol table size */
               addr += sizeof (int);
               printf("[+%d", x.a_syms);
               if (read(io, addr, x.a_syms) != x.a_syms)
                       goto shread;
               addr += x.a_syms;
               if (read(io, addr, sizeof (int)) != sizeof (int))
                       goto shread;
               i = *(int *)addr - sizeof (int);        /* string table size */
               addr += sizeof (int);
               printf("+%d]", i);
               if (read(io, addr, i) != i)
                       goto shread;
               addr += i;
               esym = roundup((int)addr, sizeof (int));
               x.a_bss = 0;
       } else
               howto &= ~RB_KDB;
       for (i = 0; i < 128*512; i++)   /* slop */
               *addr++ = 0;
       x.a_entry &= 0x7fffffff;
       printf(" start 0x%x\n", x.a_entry);
       (*((int (*)()) x.a_entry))();
       return;
shread:
       printf("Short read\n");
       return;
}

#ifdef VAX750
/* 750 Patchable Control Store magic */

#include "../vax/mtpr.h"
#include "../vax/cpu.h"
#define PCS_BITCNT      0x2000          /* number of patchbits */
#define PCS_MICRONUM    0x400           /* number of ucode locs */
#define PCS_PATCHADDR   0xf00000        /* start addr of patchbits */
#define PCS_PCSADDR     (PCS_PATCHADDR+0x8000)  /* start addr of pcs */
#define PCS_PATCHBIT    (PCS_PATCHADDR+0xc000)  /* patchbits enable reg */
#define PCS_ENABLE      0xfff00000      /* enable bits for pcs */

loadpcs()
{
       register int *ip;       /* known to be r11 below */
       register int i;         /* known to be r10 below */
       register int *jp;       /* known to be r9 below */
       register int j;
       static int pcsdone = 0;
       union cpusid sid;
       char pcs[100];
       char *cp;

       sid.cpusid = mfpr(SID);
       if (sid.cpuany.cp_type!=VAX_750 || sid.cpu750.cp_urev<95 || pcsdone)
               return;
       printf("Updating 11/750 microcode: ");
       for (cp = line; *cp; cp++)
               if (*cp == ')' || *cp == ':')
                       break;
       if (*cp) {
               strncpy(pcs, line, 99);
               pcs[99] = 0;
               i = cp - line + 1;
       } else
               i = 0;
       strcpy(pcs + i, "pcs750.bin");
       i = open(pcs, 0);
       if (i < 0)
               return;
       /*
        * We ask for more than we need to be sure we get only what we expect.
        * After read:
        *      locs 0 - 1023   packed patchbits
        *       1024 - 11264   packed microcode
        */
       if (read(i, (char *)0, 23*512) != 22*512) {
               printf("Error reading %s\n", pcs);
               close(i);
               return;
       }
       close(i);

       /*
        * Enable patchbit loading and load the bits one at a time.
        */
       *((int *)PCS_PATCHBIT) = 1;
       ip = (int *)PCS_PATCHADDR;
       jp = (int *)0;
       for (i=0; i < PCS_BITCNT; i++) {
               asm("   extzv   r10,$1,(r9),(r11)+");
       }
       *((int *)PCS_PATCHBIT) = 0;

       /*
        * Load PCS microcode 20 bits at a time.
        */
       ip = (int *)PCS_PCSADDR;
       jp = (int *)1024;
       for (i=j=0; j < PCS_MICRONUM * 4; i+=20, j++) {
               asm("   extzv   r10,$20,(r9),(r11)+");
       }

       /*
        * Enable PCS.
        */
       i = *jp;                /* get 1st 20 bits of microcode again */
       i &= 0xfffff;
       i |= PCS_ENABLE;        /* reload these bits with PCS enable set */
       *((int *)PCS_PCSADDR) = i;

       sid.cpusid = mfpr(SID);
       printf("new rev level=%d\n", sid.cpu750.cp_urev);
       pcsdone = 1;
}
#endif