efi/libefi/efizfs.c

1 /*-
2 * Copyright (c) 2008-2010 Rui Paulo
3 * Copyright (c) 2006 Marcel Moolenaar
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 *
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28#include <sys/cdefs.h>
29 __FBSDID("$FreeBSD$");
30
31#include <sys/param.h>
32#include <stand.h>
33
34#ifdef EFI_ZFS_BOOT
35#include <libzfs.h>
36#endif
37
38#include <efi.h>
39#include <efilib.h>
40
41#include "efizfs.h"
42
43#ifdef EFI_ZFS_BOOT
44 static zfsinfo_list_t zfsinfo;
45
46 uint64_t pool_guid;
47
48 zfsinfo_list_t *
49 efizfs_get_zfsinfo_list(void)
50{
51 return (&zfsinfo);
52}
53
54 EFI_HANDLE
55 efizfs_get_handle_by_guid(uint64_t guid)
56{
57 zfsinfo_t *zi;
58
59 STAILQ_FOREACH(zi, &zfsinfo, zi_link) {
60 if (zi->zi_pool_guid == guid) {
61 return (zi->zi_handle);
62 }
63 }
64 return (NULL);
65}
66
67 bool
68 efizfs_get_guid_by_handle(EFI_HANDLE handle, uint64_t *guid)
69{
70 zfsinfo_t *zi;
71
72 if (guid == NULL)
73 return (false);
74 STAILQ_FOREACH(zi, &zfsinfo, zi_link) {
75 if (zi->zi_handle == handle) {
76 *guid = zi->zi_pool_guid;
77 return (true);
78 }
79 }
80 return (false);
81}
82
83 static void
84 insert_zfs(EFI_HANDLE handle, uint64_t guid)
85{
86 zfsinfo_t *zi;
87
88 zi = malloc(sizeof(zfsinfo_t));
89 if (zi != NULL) {
90 zi->zi_handle = handle;
91 zi->zi_pool_guid = guid;
92 STAILQ_INSERT_TAIL(&zfsinfo, zi, zi_link);
93 }
94}
95
96 void
97 efi_zfs_probe(void)
98{
99 pdinfo_list_t *hdi;
100 pdinfo_t *hd, *pd = NULL;
101 char devname[SPECNAMELEN + 1];
102 uint64_t guid;
103
104 hdi = efiblk_get_pdinfo_list(&efipart_hddev);
105 STAILQ_INIT(&zfsinfo);
106
107 /*
108 * Find the handle for the boot device. The boot1 did find the
109 * device with loader binary, now we need to search for the
110 * same device and if it is part of the zfs pool, we record the
111 * pool GUID for currdev setup.
112 */
113 STAILQ_FOREACH(hd, hdi, pd_link) {
114 STAILQ_FOREACH(pd, &hd->pd_part, pd_link) {
115 snprintf(devname, sizeof(devname), "%s%dp%d:",
116 efipart_hddev.dv_name, hd->pd_unit, pd->pd_unit);
117 guid = 0;
118 if (zfs_probe_dev(devname, &guid) == 0) {
119 insert_zfs(pd->pd_handle, guid);
120 if (pd->pd_handle == boot_img->DeviceHandle)
121 pool_guid = guid;
122 }
123
124 }
125 }
126}
127#endif
128