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LinuxKPI: Implement efi_enabled(EFI_BOOT)

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efi_enabled(EFI_BOOT) returns true if machine was booted from EFI
Used by drm-kmod and some unported drm drivers like hyperv

MFC after:	1 week
Reviewed by:	hselasky, manu
Differential Revision:	https://reviews.freebsd.org/D33300
This commit is contained in:
Vladimir Kondratyev 2021-12-06 13:14:36 +03:00
parent 882f8d059c
commit 89bb7f9bda
1 changed files with 73 additions and 0 deletions
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73
sys/compat/linuxkpi/common/include/linux/efi.h Normal file
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/*-
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2021 Vladimir Kondratyev <wulf@FreeBSD.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef _LINUX_EFI_H_
#define _LINUX_EFI_H_
#include <sys/param.h>
#include <sys/linker.h>
#include <sys/systm.h>
#include <machine/md_var.h>
#include <machine/metadata.h>
#define EFI_BOOT 0
static inline bool
__efi_enabled(int feature)
{
#if defined(MODINFOMD_EFI_MAP) && !defined(__amd64__)
caddr_t kmdp;
#endif
bool enabled = false;
switch (feature) {
case EFI_BOOT:
#ifdef __amd64__
/* Use cached value on amd64 */
enabled = efi_boot;
#elif defined(MODINFOMD_EFI_MAP)
kmdp = preload_search_by_type("elf kernel");
if (kmdp == NULL)
kmdp = preload_search_by_type("elf64 kernel");
enabled = preload_search_info(kmdp,
MODINFO_METADATA | MODINFOMD_EFI_MAP) != NULL;
#endif
break;
default:
break;
}
return (enabled);
}
#define efi_enabled(x) ({ \
_Static_assert((x) == EFI_BOOT, "unsupported feature"); \
__efi_enabled(x); \
})
#endif /* _LINUX_EFI_H_ */