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_ */ 75