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Annotation of Net2/arch/i386/stand/bootxx.c, revision 1.1

1.1     ! root        1: /*-
        !             2:  * Copyright (c) 1990 The Regents of the University of California.
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * This code is derived from software contributed to Berkeley by
        !             6:  * William Jolitz.
        !             7:  *
        !             8:  * Redistribution and use in source and binary forms, with or without
        !             9:  * modification, are permitted provided that the following conditions
        !            10:  * are met:
        !            11:  * 1. Redistributions of source code must retain the above copyright
        !            12:  *    notice, this list of conditions and the following disclaimer.
        !            13:  * 2. Redistributions in binary form must reproduce the above copyright
        !            14:  *    notice, this list of conditions and the following disclaimer in the
        !            15:  *    documentation and/or other materials provided with the distribution.
        !            16:  * 3. All advertising materials mentioning features or use of this software
        !            17:  *    must display the following acknowledgement:
        !            18:  *     This product includes software developed by the University of
        !            19:  *     California, Berkeley and its contributors.
        !            20:  * 4. Neither the name of the University nor the names of its contributors
        !            21:  *    may be used to endorse or promote products derived from this software
        !            22:  *    without specific prior written permission.
        !            23:  *
        !            24:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            25:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            26:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            27:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            28:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            29:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            30:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            31:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            32:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            33:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            34:  * SUCH DAMAGE.
        !            35:  *
        !            36:  *     @(#)bootxx.c    5.2 (Berkeley) 4/28/91
        !            37:  */
        !            38: 
        !            39: #include "param.h"
        !            40: #include <a.out.h>
        !            41: #include "saio.h"
        !            42: #include "reboot.h"
        !            43: #include "disklabel.h"
        !            44: 
        !            45: char *bootprog = "/boot";
        !            46: extern int opendev, bootdev, cyloffset;
        !            47: extern struct disklabel disklabel;
        !            48: 
        !            49: /*
        !            50:  * Boot program... loads /boot out of filesystem indicated by arguements.
        !            51:  * We assume an autoboot unless we detect a misconfiguration.
        !            52:  */
        !            53: 
        !            54: main(dev, unit, off)
        !            55: {
        !            56:        register struct disklabel *lp;
        !            57:        register int io, partition, howto;
        !            58: 
        !            59: 
        !            60:        /* are we a disk, if so look at disklabel and do things */
        !            61:        lp = &disklabel;
        !            62:        if (lp->d_magic == DISKMAGIC) {
        !            63:            /*
        !            64:             * Synthesize bootdev from dev, unit, type and partition
        !            65:             * information from the block 0 bootstrap.
        !            66:             * It's dirty work, but someone's got to do it.
        !            67:             * This will be used by the filesystem primatives, and
        !            68:             * drivers. Ultimately, opendev will be created corresponding
        !            69:             * to which drive to pass to top level bootstrap.
        !            70:             */
        !            71:            for (io = 0; io < 8; io++)
        !            72: #ifdef notyetSCSI
        !            73:                if (lp->d_type == DTYPE_SCSI) {
        !            74:                        if (lp->d_partitions[io].p_offset == off)
        !            75:                                break;
        !            76:                } else
        !            77: #endif
        !            78:                if (lp->d_partitions[io].p_offset == off*lp->d_secpercyl)
        !            79:                        break;
        !            80: 
        !            81:            if (io == 8) goto screwed;
        !            82:             cyloffset = off;
        !            83:        } else {
        !            84: screwed:
        !            85:                /* probably a bad or non-existant disklabel */
        !            86:                io = 0 ;
        !            87:                howto |= RB_SINGLE|RB_ASKNAME ;
        !            88:        }
        !            89: 
        !            90:        /* construct bootdev */
        !            91:        /* currently, PC has no way of booting off alternate controllers */
        !            92:        bootdev = MAKEBOOTDEV(/*i_dev*/ dev, /*i_adapt*/0, /*i_ctlr*/0,
        !            93:            unit, /*i_part*/io);
        !            94: 
        !            95:        printf("loading %s\n", bootprog);
        !            96:        io = open(bootprog, 0);
        !            97:        if (io >= 0)
        !            98:                copyunix(io, howto);
        !            99:        _stop("boot failed\n");
        !           100: }
        !           101: 
        !           102: /*ARGSUSED*/
        !           103: copyunix(io, howto)
        !           104:        register io;    
        !           105: {
        !           106:        struct exec x;
        !           107:        register int i;
        !           108:        char *addr;
        !           109: 
        !           110:        i = read(io, (char *)&x, sizeof x);
        !           111:        if (i != sizeof x ||
        !           112:            (x.a_magic != 0407 && x.a_magic != 0413 && x.a_magic != 0410))
        !           113:                _stop("Bad format\n");
        !           114: 
        !           115:        if ((x.a_magic == 0413 || x.a_magic == 0410) &&
        !           116:            lseek(io, 0x400, 0) == -1)
        !           117:                goto shread;
        !           118: 
        !           119:        if (read(io, (char *)0, x.a_text) != x.a_text)
        !           120:                goto shread;
        !           121: 
        !           122:        addr = (char *)x.a_text;
        !           123:        if (x.a_magic == 0413 || x.a_magic == 0410)
        !           124:                while ((int)addr & CLOFSET)
        !           125:                        *addr++ = 0;
        !           126: 
        !           127:        if (read(io, addr, x.a_data) != x.a_data)
        !           128:                goto shread;
        !           129: 
        !           130:        addr += x.a_data;
        !           131:        for (i = 0; i < x.a_bss; i++)
        !           132:                *addr++ = 0;
        !           133: 
        !           134:        (*((int (*)()) x.a_entry))(howto, opendev, cyloffset);
        !           135:        return;
        !           136: shread:
        !           137:        _stop("Short read\n");
        !           138: }

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