freebsd-nq/sys/amd64/include/efi.h
Warner Losh 9057f54d74 Fail to open efirt device when no EFI on system.
libefivar expects opening /dev/efi to indicate if the we can make efi
runtime calls. With a null routine, it was always succeeding leading
efi_variables_supported() to return the wrong value. Only succeed if
we have an efi_runtime table. Also, while I'm hear, out of an
abundance of caution, add a likely redundant check to make sure
efi_systbl is not NULL before dereferencing it. I know it can't be
NULL if efi_cfgtbl is non-NULL, but the compiler doesn't.
2017-08-08 20:44:16 +00:00

67 lines
2.6 KiB
C

/*-
* Copyright (c) 2016 The FreeBSD Foundation
* All rights reserved.
*
* This software was developed by Konstantin Belousov <kib@FreeBSD.org>
* under sponsorship from the FreeBSD Foundation.
*
* 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 AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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.
*
* $FreeBSD$
*/
#ifndef __AMD64_INCLUDE_EFI_H_
#define __AMD64_INCLUDE_EFI_H_
/*
* XXX: from gcc 6.2 manual:
* Note, the ms_abi attribute for Microsoft Windows 64-bit targets
* currently requires the -maccumulate-outgoing-args option.
*
* Avoid EFIABI_ATTR declarations for compilers that don't support it.
* GCC support began in version 4.4.
*/
#if defined(__clang__) || defined(__GNUC__) && \
(__GNUC__ > 4 || __GNUC__ == 4 && __GNUC_MINOR__ >= 4)
#define EFIABI_ATTR __attribute__((ms_abi))
#endif
#ifdef _KERNEL
struct uuid;
struct efi_tm;
int efi_rt_ok(void);
int efi_get_table(struct uuid *uuid, void **ptr);
int efi_get_time(struct efi_tm *tm);
int efi_get_time_locked(struct efi_tm *tm);
int efi_reset_system(void);
int efi_set_time(struct efi_tm *tm);
int efi_set_time_locked(struct efi_tm *tm);
int efi_var_get(uint16_t *name, struct uuid *vendor, uint32_t *attrib,
size_t *datasize, void *data);
int efi_var_nextname(size_t *namesize, uint16_t *name, struct uuid *vendor);
int efi_var_set(uint16_t *name, struct uuid *vendor, uint32_t attrib,
size_t datasize, void *data);
#endif
#endif /* __AMD64_INCLUDE_EFI_H_ */