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
41static inline bool
42__efi_enabled(int feature)
43{
44#if defined(MODINFOMD_EFI_MAP) && !defined(__amd64__)
45	caddr_t kmdp;
46#endif
47	bool enabled = false;
48
49	switch (feature) {
50	case EFI_BOOT:
51#ifdef __amd64__
52		/* Use cached value on amd64 */
53		enabled = efi_boot;
54#elif defined(MODINFOMD_EFI_MAP)
55		kmdp = preload_search_by_type("elf kernel");
56		if (kmdp == NULL)
57			kmdp = preload_search_by_type("elf64 kernel");
58		enabled = preload_search_info(kmdp,
59		    MODINFO_METADATA | MODINFOMD_EFI_MAP) != NULL;
60#endif
61		break;
62	default:
63		break;
64	}
65
66	return (enabled);
67}
68
69#define	efi_enabled(x)	({					\
70	_Static_assert((x) == EFI_BOOT, "unsupported feature");	\
71	__efi_enabled(x);					\
72})
73
74#endif	/* _LINUXKPI_LINUX_EFI_H_ */
75