Fully synchronize sys/boot from FreeBSD-5.x, but add / to the module path
[dragonfly.git] / sys / boot / i386 / kgzldr / boot.c
CommitLineData
5ee58eed 1/*-
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2 * Copyright (c) 1999 Global Technology Associates, Inc.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
17 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS
18 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
19 * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
20 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
21 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
22 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
23 * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
24 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 *
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26 * $FreeBSD: src/sys/boot/i386/kgzldr/boot.c,v 1.3 2003/08/25 23:28:31 obrien Exp $
27 * $DragonFly: src/sys/boot/i386/kgzldr/Attic/boot.c,v 1.3 2003/11/10 06:08:35 dillon Exp $
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28 */
29
30#include <sys/types.h>
31#include <sys/reboot.h>
32#include <sys/inflate.h>
33
34#include "kgzldr.h"
35
36#define KGZ_HEAD 0xa /* leading bytes to ignore */
37#define KGZ_TAIL 0x8 /* trailing bytes to ignore */
38
39#define E_FMT 1 /* Error: Invalid format */
40#define E_MEM 2 /* Error: Out of memory */
41
42struct kgz_hdr {
43 char ident[4]; /* identification */
44 uint32_t dload; /* decoded image load address */
45 uint32_t dsize; /* decoded image size */
46 uint32_t isize; /* image size in memory */
47 uint32_t entry; /* program entry point */
48 uint32_t nsize; /* encoded image size */
49};
50extern struct kgz_hdr kgz; /* header */
51extern uint8_t kgz_ndata[]; /* encoded image */
52
53static const char *const msg[] = {
54 "done",
55 "invalid format",
56 "out of memory"
57};
58
59static const u_char *ip; /* input pointer */
60static u_char *op; /* output pointer */
61
62static struct inflate infl; /* inflate() parameters */
63
64static int decode(void);
65static int input(void *);
66static int output(void *, u_char *, u_long);
67
68/*
69 * Uncompress and boot a kernel.
70 */
71int
72boot(int howto)
73{
74 int err;
75
76 kgz_con = howto & RB_SERIAL ? KGZ_SIO : KGZ_CRT;
77 putstr("Uncompressing ... ");
78 err = decode();
79 putstr(msg[err]);
80 putstr("\n");
81 if (err) {
82 putstr("System halted");
83 for (;;)
84 ;
85 }
86 return err;
87}
88
89/*
90 * Interface with inflate() to uncompress the data.
91 */
92static int
93decode(void)
94{
95 static u_char slide[GZ_WSIZE];
96 int err;
97
98 ip = kgz_ndata + KGZ_HEAD;
99 op = (u_char *)kgz.dload;
100 infl.gz_input = input;
101 infl.gz_output = output;
102 infl.gz_slide = slide;
103 err = inflate(&infl);
104 return err ? err == 3 ? E_MEM : E_FMT : 0;
105}
106
107/*
108 * Read a byte.
109 */
110static int
111input(void *dummy)
112{
113 if ((size_t)(ip - kgz_ndata) + KGZ_TAIL > kgz.nsize)
114 return GZ_EOF;
115 return *ip++;
116}
117
118/*
119 * Write some bytes.
120 */
121static int
122output(void *dummy, u_char * ptr, u_long len)
123{
124 if (op - (u_char *)kgz.dload + len > kgz.dsize)
125 return -1;
126 while (len--)
127 *op++ = *ptr++;
128 return 0;
129}