bootinfo.c revision 138249 
1/*-
2 * Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
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 PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27#include <sys/cdefs.h>
28__FBSDID("$FreeBSD: head/sys/boot/i386/libi386/bootinfo.c 138249 2004-12-01 04:59:33Z scottl $");
29
30#include <stand.h>
31#include <sys/param.h>
32#include <sys/reboot.h>
33#include <sys/linker.h>
34#include "bootstrap.h"
35#include "libi386.h"
36#include "btxv86.h"
37
38/*
39 * Return a 'boothowto' value corresponding to the kernel arguments in
40 * (kargs) and any relevant environment variables.
41 */
42static struct
43{
44    const char	*ev;
45    int		mask;
46} howto_names[] = {
47    {"boot_askname",	RB_ASKNAME},
48    {"boot_cdrom",	RB_CDROM},
49    {"boot_ddb",	RB_KDB},
50    {"boot_gdb",	RB_GDB},
51    {"boot_single",	RB_SINGLE},
52    {"boot_verbose",	RB_VERBOSE},
53    {"boot_multicons",	RB_MULTIPLE},
54    {"boot_serial",	RB_SERIAL},
55    {NULL,	0}
56};
57
58int
59bi_getboothowto(char *kargs)
60{
61    char	*cp;
62    int		howto;
63    int		active;
64    int		i;
65
66    /* Parse kargs */
67    howto = 0;
68    if (kargs  != NULL) {
69	cp = kargs;
70	active = 0;
71	while (*cp != 0) {
72	    if (!active && (*cp == '-')) {
73		active = 1;
74	    } else if (active)
75		switch (*cp) {
76		case 'a':
77		    howto |= RB_ASKNAME;
78		    break;
79		case 'C':
80		    howto |= RB_CDROM;
81		    break;
82		case 'd':
83		    howto |= RB_KDB;
84		    break;
85		case 'D':
86		    howto |= RB_MULTIPLE;
87		    break;
88		case 'm':
89		    howto |= RB_MUTE;
90		    break;
91		case 'g':
92		    howto |= RB_GDB;
93		    break;
94		case 'h':
95		    howto |= RB_SERIAL;
96		    break;
97		case 'p':
98		    howto |= RB_PAUSE;
99		    break;
100		case 'r':
101		    howto |= RB_DFLTROOT;
102		    break;
103		case 's':
104		    howto |= RB_SINGLE;
105		    break;
106		case 'v':
107		    howto |= RB_VERBOSE;
108		    break;
109		default:
110		    active = 0;
111		    break;
112		}
113	    cp++;
114	}
115    }
116    /* get equivalents from the environment */
117    for (i = 0; howto_names[i].ev != NULL; i++)
118	if (getenv(howto_names[i].ev) != NULL)
119	    howto |= howto_names[i].mask;
120    if (!strcmp(getenv("console"), "comconsole"))
121	howto |= RB_SERIAL;
122    if (!strcmp(getenv("console"), "nullconsole"))
123	howto |= RB_MUTE;
124    return(howto);
125}
126
127/*
128 * Copy the environment into the load area starting at (addr).
129 * Each variable is formatted as <name>=<value>, with a single nul
130 * separating each variable, and a double nul terminating the environment.
131 */
132vm_offset_t
133bi_copyenv(vm_offset_t addr)
134{
135    struct env_var	*ep;
136
137    /* traverse the environment */
138    for (ep = environ; ep != NULL; ep = ep->ev_next) {
139	i386_copyin(ep->ev_name, addr, strlen(ep->ev_name));
140	addr += strlen(ep->ev_name);
141	i386_copyin("=", addr, 1);
142	addr++;
143	if (ep->ev_value != NULL) {
144	    i386_copyin(ep->ev_value, addr, strlen(ep->ev_value));
145	    addr += strlen(ep->ev_value);
146	}
147	i386_copyin("", addr, 1);
148	addr++;
149    }
150    i386_copyin("", addr, 1);
151    addr++;
152    return(addr);
153}
154