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Annotation of 43BSD/sys/stand/bootra.c, revision 1.1

1.1     ! root        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: }

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