The branch main has been updated by wulf: URL: https://cgit.FreeBSD.org/src/commit/?id=89bb7f9bda32d9d54c03a488ed136efdd366cdeb
commit 89bb7f9bda32d9d54c03a488ed136efdd366cdeb Author: Vladimir Kondratyev <[email protected]> AuthorDate: 2021-12-06 10:14:36 +0000 Commit: Vladimir Kondratyev <[email protected]> CommitDate: 2022-01-10 19:49:38 +0000 LinuxKPI: Implement efi_enabled(EFI_BOOT) 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 --- sys/compat/linuxkpi/common/include/linux/efi.h | 73 ++++++++++++++++++++++++++ 1 file changed, 73 insertions(+) diff --git a/sys/compat/linuxkpi/common/include/linux/efi.h b/sys/compat/linuxkpi/common/include/linux/efi.h new file mode 100644 index 000000000000..b7b0e681b6f2 --- /dev/null +++ b/sys/compat/linuxkpi/common/include/linux/efi.h @@ -0,0 +1,73 @@ +/*- + * SPDX-License-Identifier: BSD-2-Clause + * + * Copyright (c) 2021 Vladimir Kondratyev <[email protected]> + * + * 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_ */
