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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:
1.1.1.2 root 37: #ifdef lint
1.1 root 38: char copyright[] =
39: "@(#) Copyright (c) 1990 The Regents of the University of California.\n\
40: All rights reserved.\n";
41: #endif /* not lint */
42:
1.1.1.2 root 43: #ifdef lint
44: static char sccsid[] = "from:@(#)boot.c 7.3 (Berkeley) 5/4/91";
1.1 root 45: #endif /* not lint */
46:
47: #include "param.h"
48: #include "reboot.h"
49: #include <a.out.h>
50: #include "saio.h"
1.1.1.2 root 51: #include "disklabel.h"
52: #include "dinode.h"
1.1 root 53:
54: /*
1.1.1.2 root 55: * Boot program, loaded by boot block from remaing 7.5K of boot area.
56: * Sifts through disklabel and attempts to load an program image of
57: * a standalone program off the disk. If keyboard is hit during load,
58: * or if an error is encounter, try alternate files.
1.1 root 59: */
60:
1.1.1.2 root 61: char *files[] = { "386bsd", "386bsd.alt", "386bsd.old", "boot" , "vmunix", 0};
1.1 root 62: int retry = 0;
1.1.1.2 root 63: extern struct disklabel disklabel;
64: extern int bootdev, cyloffset;
1.1.1.3 ! root 65: static unsigned char *biosparams = (char *) 0x9ff00; /* XXX */
1.1 root 66:
1.1.1.2 root 67: /*
68: * Boot program... loads /boot out of filesystem indicated by arguements.
69: * We assume an autoboot unless we detect a misconfiguration.
70: */
1.1 root 71:
1.1.1.2 root 72: main(dev, unit, off)
73: {
74: register struct disklabel *lp;
75: register int io;
76: register char **bootfile = files;
77: int howto = 0;
1.1.1.3 ! root 78: extern int scsisn; /* XXX */
1.1.1.2 root 79:
80:
81: /* are we a disk, if so look at disklabel and do things */
82: lp = &disklabel;
1.1.1.3 ! root 83: if (lp->d_type == DTYPE_SCSI) /* XXX */
! 84: off = htonl(scsisn); /* XXX */
! 85:
! 86: /*printf("cyl %x %x hd %x sect %x ", biosparams[0], biosparams[1], biosparams[2], biosparams[0xe]);
! 87: printf("dev %x unit %x off %d\n", dev, unit, off);*/
! 88:
1.1.1.2 root 89: if (lp->d_magic == DISKMAGIC) {
90: /*
91: * Synthesize bootdev from dev, unit, type and partition
92: * information from the block 0 bootstrap.
93: * It's dirty work, but someone's got to do it.
94: * This will be used by the filesystem primatives, and
95: * drivers. Ultimately, opendev will be created corresponding
96: * to which drive to pass to top level bootstrap.
97: */
98: for (io = 0; io < lp->d_npartitions; io++) {
1.1.1.3 ! root 99: int sn;
! 100:
1.1.1.2 root 101: if (lp->d_partitions[io].p_size == 0)
102: continue;
1.1.1.3 ! root 103: if (lp->d_type == DTYPE_SCSI)
! 104: sn = off;
! 105: else
! 106: sn = off * lp->d_secpercyl;
! 107: if (lp->d_partitions[io].p_offset == sn)
1.1.1.2 root 108: break;
109: }
110:
1.1.1.3 ! root 111: if (io == lp->d_npartitions) goto screwed;
1.1.1.2 root 112: cyloffset = off;
113: } else {
114: screwed:
115: /* probably a bad or non-existant disklabel */
116: io = 0 ;
117: howto |= RB_SINGLE|RB_ASKNAME ;
1.1 root 118: }
119:
1.1.1.2 root 120: /* construct bootdev */
121: /* currently, PC has no way of booting off alternate controllers */
122: bootdev = MAKEBOOTDEV(/*i_dev*/ dev, /*i_adapt*/0, /*i_ctlr*/0,
123: unit, /*i_part*/io);
124:
125: for (;;) {
1.1 root 126:
1.1.1.2 root 127: /*printf("namei %s", *bootfile);*/
128: io = namei(*bootfile);
129: if (io > 2) {
1.1.1.3 ! root 130: copyunix(io, howto, off);
1.1 root 131: } else
1.1.1.2 root 132: printf("File not found");
1.1 root 133:
1.1.1.2 root 134: printf(" - didn't load %s, ",*bootfile);
135: if(*++bootfile == 0) bootfile = files;
136: printf("will try %s\n", *bootfile);
1.1 root 137:
1.1.1.2 root 138: wait(1<<((retry++) + 10));
1.1 root 139: }
140: }
141:
142: /*ARGSUSED*/
1.1.1.3 ! root 143: copyunix(io, howto, cyloff)
1.1 root 144: register io;
145: {
146: struct exec x;
147: int i;
148: char *addr,c;
1.1.1.2 root 149: struct dinode fil;
150: int off;
1.1 root 151:
1.1.1.2 root 152: fetchi(io, &fil);
153: /*printf("mode %o ", fil.di_mode);*/
154: i = iread(&fil, 0, (char *)&x, sizeof x);
155: off = sizeof x;
156: if (i != sizeof x || x.a_magic != 0413) {
157: printf("Not an executable format");
1.1 root 158: return;
159: }
160:
1.1.1.3 ! root 161: if (roundup(x.a_text, 4096) + x.a_data + x.a_bss > (unsigned)&fil) {
! 162: printf("File too big to load");
! 163: return;
! 164: }
! 165:
1.1.1.2 root 166: off = 4096;
167: if (iread(&fil, off, (char *)0, x.a_text) != x.a_text)
1.1 root 168: goto shread;
1.1.1.2 root 169: off += x.a_text;
1.1 root 170:
171: addr = (char *)x.a_text;
1.1.1.2 root 172: while ((int)addr & CLOFSET)
173: *addr++ = 0;
174:
175: if (iread(&fil, off, addr, x.a_data) != x.a_data)
1.1 root 176: goto shread;
177:
178: addr += x.a_data;
1.1.1.3 ! root 179:
! 180: if (addr + x.a_bss > (unsigned) &fil) {
! 181: printf("Warning: bss overlaps bootstrap");
! 182: x.a_bss = (unsigned)addr - (unsigned)&fil;
! 183: }
1.1.1.2 root 184: bzero(addr, x.a_bss);
1.1 root 185:
186: /* mask high order bits corresponding to relocated system base */
1.1.1.2 root 187: x.a_entry &= ~0xfff00000;
1.1 root 188:
1.1.1.2 root 189: /*if (scankbd()) {
190: printf("Operator abort");
191: kbdreset();
192: return;
193: }*/
1.1 root 194:
1.1.1.2 root 195: /* howto, bootdev, cyl */
1.1.1.3 ! root 196: /*printf("entry %x [%x] ", x.a_entry, *(int *) x.a_entry);*/
! 197: bcopy(0x9ff00, 0x300, 0x20); /* XXX */
! 198: i = (*((int (*)()) x.a_entry))(howto, bootdev, off);
1.1 root 199:
1.1.1.2 root 200: if (i) printf("Program exits with %d", i) ;
1.1 root 201: return;
202: shread:
1.1.1.2 root 203: printf("Read of file is incomplete");
1.1 root 204: return;
205: }
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