1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2021 Vladimir Kondratyev <wulf@FreeBSD.org>
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 #ifndef _LINUXKPI_LINUX_EFI_H_
29 #define _LINUXKPI_LINUX_EFI_H_
30
31 #include <sys/param.h>
32 #include <sys/queue.h>
33 #include <sys/linker.h>
34 #include <sys/systm.h>
35
36 #include <machine/md_var.h>
37 #include <machine/metadata.h>
38
39 #define EFI_BOOT 0
40
41 static inline bool
__efi_enabled(int feature)42 __efi_enabled(int feature)
43 {
44 bool enabled = false;
45
46 switch (feature) {
47 case EFI_BOOT:
48 #ifdef __amd64__
49 /* Use cached value on amd64 */
50 enabled = efi_boot;
51 #elif defined(MODINFOMD_EFI_MAP)
52 enabled = preload_search_info(preload_kmdp,
53 MODINFO_METADATA | MODINFOMD_EFI_MAP) != NULL;
54 #endif
55 break;
56 default:
57 break;
58 }
59
60 return (enabled);
61 }
62
63 #define efi_enabled(x) ({ \
64 _Static_assert((x) == EFI_BOOT, "unsupported feature"); \
65 __efi_enabled(x); \
66 })
67
68 #endif /* _LINUXKPI_LINUX_EFI_H_ */
69