xref: /freebsd/stand/efi/boot1/ufs_module.c (revision 0957b409)
1 /*-
2  * Copyright (c) 1998 Robert Nordier
3  * All rights reserved.
4  * Copyright (c) 2001 Robert Drehmel
5  * All rights reserved.
6  * Copyright (c) 2014 Nathan Whitehorn
7  * All rights reserved.
8  * Copyright (c) 2015 Eric McCorkle
9  * All rights reverved.
10  *
11  * Redistribution and use in source and binary forms, with or without
12  * modification, are permitted provided that the following conditions
13  * are met:
14  * 1. Redistributions of source code must retain the above copyright
15  *    notice, this list of conditions and the following disclaimer.
16  * 2. Redistributions in binary form must reproduce the above copyright
17  *    notice, this list of conditions and the following disclaimer in the
18  *    documentation and/or other materials provided with the distribution.
19  *
20  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30  * SUCH DAMAGE.
31  *
32  * $FreeBSD$
33  */
34 
35 #include <stdarg.h>
36 #include <stdbool.h>
37 #include <sys/cdefs.h>
38 #include <sys/param.h>
39 #include <sys/disk/bsd.h>
40 #include <efi.h>
41 
42 #include "boot_module.h"
43 
44 #define BSD_LABEL_BUFFER	8192
45 #define BSD_LABEL_OFFSET	DEV_BSIZE
46 
47 static dev_info_t *devinfo;
48 static dev_info_t *devices;
49 
50 static int
51 dskread(void *buf, uint64_t lba, int nblk)
52 {
53 	int size;
54 	EFI_STATUS status;
55 
56 	lba += devinfo->partoff;
57 	lba = lba / (devinfo->dev->Media->BlockSize / DEV_BSIZE);
58 	size = nblk * DEV_BSIZE;
59 
60 	status = devinfo->dev->ReadBlocks(devinfo->dev,
61 	    devinfo->dev->Media->MediaId, lba, size, buf);
62 
63 	if (status != EFI_SUCCESS) {
64 		DPRINTF("dskread: failed dev: %p, id: %u, lba: %ju, size: %d, "
65 		    "status: %lu\n", devinfo->dev,
66 		    devinfo->dev->Media->MediaId, (uintmax_t)lba, size,
67 		    EFI_ERROR_CODE(status));
68 		return (-1);
69 	}
70 
71 	return (0);
72 }
73 
74 #include "ufsread.c"
75 
76 static struct dmadat __dmadat;
77 
78 static int
79 init_dev(dev_info_t* dev)
80 {
81 	char buffer[BSD_LABEL_BUFFER];
82 	struct disklabel *dl;
83 	uint64_t bs;
84 	int ok;
85 
86 	devinfo = dev;
87 	dmadat = &__dmadat;
88 
89 	/*
90 	 * First try offset 0. This is the typical GPT case where we have no
91 	 * further partitioning (as well as the degenerate MBR case where
92 	 * the bsdlabel has a 0 offset).
93 	 */
94 	devinfo->partoff = 0;
95 	ok = fsread(0, NULL, 0);
96 	if (ok >= 0)
97 		return (ok);
98 
99 	/*
100 	 * Next, we look for a bsdlabel. This is technically located in sector
101 	 * 1. For 4k sectors, this offset is 4096, for 512b sectors it's
102 	 * 512. However, we have to fall back to 512 here because we create
103 	 * images that assume 512 byte blocks, but these can be put on devices
104 	 * who have 4k (or other) block sizes. If there's a crazy block size, we
105 	 * skip the 'at one sector' and go stright to checking at 512 bytes.
106 	 * There are other offsets that are historic, but we don't probe those
107 	 * since they were never used for MBR disks on FreeBSD on systems that
108 	 * could boot UEFI. UEFI is little endian only, as are BSD labels. We
109 	 * will retry fsread(0) only if there's a label found with a non-zero
110 	 * offset.
111 	 */
112 	if (dskread(buffer, 0, BSD_LABEL_BUFFER / DEV_BSIZE) != 0)
113 		return (-1);
114 	dl = NULL;
115 	bs = devinfo->dev->Media->BlockSize;
116 	if (bs != 0 && bs <= BSD_LABEL_BUFFER / 2)
117 		dl = (struct disklabel *)&buffer[bs];
118 	if (dl == NULL || dl->d_magic != BSD_MAGIC || dl->d_magic2 != BSD_MAGIC)
119 		dl = (struct disklabel *)&buffer[BSD_LABEL_OFFSET];
120 	if (dl->d_magic != BSD_MAGIC || dl->d_magic2 != BSD_MAGIC ||
121 	    dl->d_partitions[0].p_offset == 0)
122 		return (-1);
123 	devinfo->partoff = dl->d_partitions[0].p_offset;
124 	return (fsread(0, NULL, 0));
125 }
126 
127 static EFI_STATUS
128 probe(dev_info_t* dev)
129 {
130 
131 	if (init_dev(dev) < 0)
132 		return (EFI_UNSUPPORTED);
133 
134 	add_device(&devices, dev);
135 
136 	return (EFI_SUCCESS);
137 }
138 
139 static EFI_STATUS
140 load(const char *filepath, dev_info_t *dev, void **bufp, size_t *bufsize)
141 {
142 	ufs_ino_t ino;
143 	EFI_STATUS status;
144 	size_t size;
145 	ssize_t read;
146 	void *buf;
147 
148 #ifdef EFI_DEBUG
149 	{
150 		CHAR16 *text = efi_devpath_name(dev->devpath);
151 		DPRINTF("Loading '%s' from %S\n", filepath, text);
152 		efi_free_devpath_name(text);
153 	}
154 #endif
155 	if (init_dev(dev) < 0) {
156 		DPRINTF("Failed to init device\n");
157 		return (EFI_UNSUPPORTED);
158 	}
159 
160 	if ((ino = lookup(filepath)) == 0) {
161 		DPRINTF("Failed to lookup '%s' (file not found?)\n", filepath);
162 		return (EFI_NOT_FOUND);
163 	}
164 
165 	if (fsread_size(ino, NULL, 0, &size) < 0 || size <= 0) {
166 		printf("Failed to read size of '%s' ino: %d\n", filepath, ino);
167 		return (EFI_INVALID_PARAMETER);
168 	}
169 
170 	if ((status = BS->AllocatePool(EfiLoaderData, size, &buf)) !=
171 	    EFI_SUCCESS) {
172 		printf("Failed to allocate read buffer %zu for '%s' (%lu)\n",
173 		    size, filepath, EFI_ERROR_CODE(status));
174 		return (status);
175 	}
176 
177 	read = fsread(ino, buf, size);
178 	if ((size_t)read != size) {
179 		printf("Failed to read '%s' (%zd != %zu)\n", filepath, read,
180 		    size);
181 		(void)BS->FreePool(buf);
182 		return (EFI_INVALID_PARAMETER);
183 	}
184 
185 	DPRINTF("Load complete\n");
186 
187 	*bufp = buf;
188 	*bufsize = size;
189 
190 	return (EFI_SUCCESS);
191 }
192 
193 static void
194 status(void)
195 {
196 	int i;
197 	dev_info_t *dev;
198 
199 	for (dev = devices, i = 0; dev != NULL; dev = dev->next, i++)
200 		;
201 
202 	printf("%s found ", ufs_module.name);
203 	switch (i) {
204 	case 0:
205 		printf("no partitions\n");
206 		break;
207 	case 1:
208 		printf("%d partition\n", i);
209 		break;
210 	default:
211 		printf("%d partitions\n", i);
212 	}
213 }
214 
215 static dev_info_t *
216 _devices(void)
217 {
218 
219 	return (devices);
220 }
221 
222 const boot_module_t ufs_module =
223 {
224 	.name = "UFS",
225 	.probe = probe,
226 	.load = load,
227 	.status = status,
228 	.devices = _devices
229 };
230