handles.c revision 271135 
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: stable/10/sys/boot/efi/libefi/handles.c 271135 2014-09-04 21:01:10Z emaste $");
29
30#include <efi.h>
31#include <efilib.h>
32
33struct entry {
34	EFI_HANDLE handle;
35	EFI_HANDLE alias;
36	struct devsw *dev;
37	int unit;
38};
39
40struct entry *entry;
41int nentries;
42
43int
44efi_register_handles(struct devsw *sw, EFI_HANDLE *handles,
45    EFI_HANDLE *aliases, int count)
46{
47	size_t sz;
48	int idx, unit;
49
50	idx = nentries;
51	nentries += count;
52	sz = nentries * sizeof(struct entry);
53	entry = (entry == NULL) ? malloc(sz) : realloc(entry, sz);
54	for (unit = 0; idx < nentries; idx++, unit++) {
55		entry[idx].handle = handles[unit];
56		if (aliases != NULL)
57			entry[idx].alias = aliases[unit];
58		else
59			entry[idx].alias = NULL;
60		entry[idx].dev = sw;
61		entry[idx].unit = unit;
62	}
63	return (0);
64}
65
66EFI_HANDLE
67efi_find_handle(struct devsw *dev, int unit)
68{
69	int idx;
70
71	for (idx = 0; idx < nentries; idx++) {
72		if (entry[idx].dev != dev)
73			continue;
74		if (entry[idx].unit != unit)
75			continue;
76		return (entry[idx].handle);
77	}
78	return (NULL);
79}
80
81int
82efi_handle_lookup(EFI_HANDLE h, struct devsw **dev, int *unit)
83{
84	int idx;
85
86	for (idx = 0; idx < nentries; idx++) {
87		if (entry[idx].handle != h && entry[idx].alias != h)
88			continue;
89		if (dev != NULL)
90			*dev = entry[idx].dev;
91		if (unit != NULL)
92			*unit = entry[idx].unit;
93		return (0);
94	}
95	return (ENOENT);
96}
97