partedit_x86.c revision 273831 
1/*-
2 * Copyright (c) 2011 Nathan Whitehorn
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 * $FreeBSD: stable/10/usr.sbin/bsdinstall/partedit/partedit_x86.c 273831 2014-10-29 16:48:18Z nwhitehorn $
27 */
28
29#include <sys/types.h>
30#include <sys/sysctl.h>
31#include <string.h>
32
33#include "partedit.h"
34
35static const char *
36x86_bootmethod(void)
37{
38	static char fw[255] = "";
39	size_t len = sizeof(fw);
40	int error;
41
42	if (strlen(fw) == 0) {
43		error = sysctlbyname("machdep.bootmethod", fw, &len, NULL, -1);
44		if (error != 0)
45			return ("BIOS");
46	}
47
48	return (fw);
49}
50
51const char *
52default_scheme(void)
53{
54	return ("GPT");
55}
56
57int
58is_scheme_bootable(const char *part_type)
59{
60
61	if (strcmp(part_type, "GPT") == 0)
62		return (1);
63	if (strcmp(x86_bootmethod(), "BIOS") == 0) {
64		if (strcmp(part_type, "BSD") == 0)
65			return (1);
66		if (strcmp(part_type, "MBR") == 0)
67			return (1);
68	}
69
70	return (0);
71}
72
73int
74is_fs_bootable(const char *part_type, const char *fs)
75{
76
77	if (strcmp(fs, "freebsd-ufs") == 0)
78		return (1);
79
80	if (strcmp(fs, "freebsd-zfs") == 0 &&
81	    strcmp(part_type, "GPT") == 0 &&
82	    strcmp(x86_bootmethod(), "BIOS") == 0)
83		return (1);
84
85	return (0);
86}
87
88size_t
89bootpart_size(const char *scheme)
90{
91
92	/* No partcode except for GPT */
93	if (strcmp(scheme, "GPT") != 0)
94		return (0);
95
96	if (strcmp(x86_bootmethod(), "BIOS") == 0)
97		return (512*1024);
98	else
99		return (800*1024);
100
101	return (0);
102}
103
104const char *
105bootpart_type(const char *scheme)
106{
107
108	if (strcmp(x86_bootmethod(), "UEFI") == 0)
109		return ("efi");
110
111	return ("freebsd-boot");
112}
113
114const char *
115bootcode_path(const char *part_type)
116{
117
118	if (strcmp(x86_bootmethod(), "UEFI") == 0)
119		return (NULL);
120
121	if (strcmp(part_type, "GPT") == 0)
122		return ("/boot/pmbr");
123	if (strcmp(part_type, "MBR") == 0)
124		return ("/boot/mbr");
125	if (strcmp(part_type, "BSD") == 0)
126		return ("/boot/boot");
127
128	return (NULL);
129}
130
131const char *
132partcode_path(const char *part_type, const char *fs_type)
133{
134
135	if (strcmp(part_type, "GPT") == 0) {
136		if (strcmp(x86_bootmethod(), "UEFI") == 0)
137			return ("/boot/boot1.efifat");
138		else if (strcmp(fs_type, "zfs") == 0)
139			return ("/boot/gptzfsboot");
140		else
141			return ("/boot/gptboot");
142	}
143
144	/* No partcode except for GPT */
145	return (NULL);
146}
147
148