1 /*-
2  * Copyright (c) 2006 Marcel Moolenaar
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  *
9  * 1. Redistributions of source code must retain the above copyright
10  *    notice, this list of conditions and the following disclaimer.
11  * 2. Redistributions in binary form must reproduce the above copyright
12  *    notice, this list of conditions and the following disclaimer in the
13  *    documentation and/or other materials provided with the distribution.
14  *
15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25  */
26 
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
29 
30 #include <efi.h>
31 #include <efilib.h>
32 
33 struct entry {
34 	EFI_HANDLE handle;
35 	EFI_HANDLE alias;
36 	struct devsw *dev;
37 	int unit;
38 	uint64_t extra;
39 };
40 
41 struct entry *entry;
42 int nentries;
43 
44 int
efi_register_handles(struct devsw * sw,EFI_HANDLE * handles,EFI_HANDLE * aliases,int count)45 efi_register_handles(struct devsw *sw, EFI_HANDLE *handles,
46     EFI_HANDLE *aliases, int count)
47 {
48 	size_t sz;
49 	int idx, unit;
50 
51 	idx = nentries;
52 	nentries += count;
53 	sz = nentries * sizeof(struct entry);
54 	entry = (entry == NULL) ? malloc(sz) : realloc(entry, sz);
55 	for (unit = 0; idx < nentries; idx++, unit++) {
56 		entry[idx].handle = handles[unit];
57 		if (aliases != NULL)
58 			entry[idx].alias = aliases[unit];
59 		else
60 			entry[idx].alias = NULL;
61 		entry[idx].dev = sw;
62 		entry[idx].unit = unit;
63 	}
64 	return (0);
65 }
66 
67 EFI_HANDLE
efi_find_handle(struct devsw * dev,int unit)68 efi_find_handle(struct devsw *dev, int unit)
69 {
70 	int idx;
71 
72 	for (idx = 0; idx < nentries; idx++) {
73 		if (entry[idx].dev != dev)
74 			continue;
75 		if (entry[idx].unit != unit)
76 			continue;
77 		return (entry[idx].handle);
78 	}
79 	return (NULL);
80 }
81 
82 int
efi_handle_lookup(EFI_HANDLE h,struct devsw ** dev,int * unit,uint64_t * extra)83 efi_handle_lookup(EFI_HANDLE h, struct devsw **dev, int *unit, uint64_t *extra)
84 {
85 	int idx;
86 
87 	for (idx = 0; idx < nentries; idx++) {
88 		if (entry[idx].handle != h && entry[idx].alias != h)
89 			continue;
90 		if (dev != NULL)
91 			*dev = entry[idx].dev;
92 		if (unit != NULL)
93 			*unit = entry[idx].unit;
94 		if (extra != NULL)
95 			*extra = entry[idx].extra;
96 		return (0);
97 	}
98 	return (ENOENT);
99 }
100 
101 int
efi_handle_update_dev(EFI_HANDLE h,struct devsw * dev,int unit,uint64_t guid)102 efi_handle_update_dev(EFI_HANDLE h, struct devsw *dev, int unit,
103     uint64_t guid)
104 {
105 	int idx;
106 
107 	for (idx = 0; idx < nentries; idx++) {
108 		if (entry[idx].handle != h)
109 			continue;
110 		entry[idx].dev = dev;
111 		entry[idx].unit = unit;
112 		entry[idx].alias = NULL;
113 		entry[idx].extra = guid;
114 		return (0);
115 	}
116 
117 	return (ENOENT);
118 }
119