efi.h

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    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
   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_ */

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FreeBSD/Linux Kernel Cross Reference sys/compat/linuxkpi/common/include/linux/efi.h

FreeBSD/Linux Kernel Cross Reference
sys/compat/linuxkpi/common/include/linux/efi.h