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  * $FreeBSD$
27  */
28 
29 #include <sys/types.h>
30 #include <sys/sysctl.h>
31 #include <string.h>
32 
33 #include "partedit.h"
34 
35 static const char *
36 x86_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 
51 const char *
52 default_scheme(void)
53 {
54 	if (strcmp(x86_bootmethod(), "UEFI") == 0)
55 		return ("GPT");
56 	else
57 		return ("MBR");
58 }
59 
60 int
61 is_scheme_bootable(const char *part_type)
62 {
63 
64 	if (strcmp(part_type, "GPT") == 0)
65 		return (1);
66 	if (strcmp(x86_bootmethod(), "BIOS") == 0) {
67 		if (strcmp(part_type, "BSD") == 0)
68 			return (1);
69 		if (strcmp(part_type, "MBR") == 0)
70 			return (1);
71 	}
72 
73 	return (0);
74 }
75 
76 int
77 is_fs_bootable(const char *part_type, const char *fs)
78 {
79 
80 	if (strcmp(fs, "freebsd-ufs") == 0)
81 		return (1);
82 
83 	if (strcmp(fs, "freebsd-zfs") == 0 &&
84 	    strcmp(part_type, "GPT") == 0 &&
85 	    strcmp(x86_bootmethod(), "BIOS") == 0)
86 		return (1);
87 
88 	return (0);
89 }
90 
91 size_t
92 bootpart_size(const char *scheme)
93 {
94 
95 	/* No partcode except for GPT */
96 	if (strcmp(scheme, "GPT") != 0)
97 		return (0);
98 
99 	if (strcmp(x86_bootmethod(), "BIOS") == 0)
100 		return (512*1024);
101 	else
102 		return (800*1024);
103 
104 	return (0);
105 }
106 
107 const char *
108 bootpart_type(const char *scheme)
109 {
110 
111 	if (strcmp(x86_bootmethod(), "UEFI") == 0)
112 		return ("efi");
113 
114 	return ("freebsd-boot");
115 }
116 
117 const char *
118 bootcode_path(const char *part_type)
119 {
120 
121 	if (strcmp(x86_bootmethod(), "UEFI") == 0)
122 		return (NULL);
123 
124 	if (strcmp(part_type, "GPT") == 0)
125 		return ("/boot/pmbr");
126 	if (strcmp(part_type, "MBR") == 0)
127 		return ("/boot/mbr");
128 	if (strcmp(part_type, "BSD") == 0)
129 		return ("/boot/boot");
130 
131 	return (NULL);
132 }
133 
134 const char *
135 partcode_path(const char *part_type, const char *fs_type)
136 {
137 
138 	if (strcmp(part_type, "GPT") == 0) {
139 		if (strcmp(x86_bootmethod(), "UEFI") == 0)
140 			return ("/boot/boot1.efifat");
141 		else if (strcmp(fs_type, "zfs") == 0)
142 			return ("/boot/gptzfsboot");
143 		else
144 			return ("/boot/gptboot");
145 	}
146 
147 	/* No partcode except for GPT */
148 	return (NULL);
149 }
150 
151