1 /*- 2 * Copyright (c) 2017 Netflix, Inc. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 * $FreeBSD$ 27 */ 28 29 #ifndef _EFIVAR_DP_H_ 30 #define _EFIVAR_DP_H_ 31 32 /* 33 * "Linux compatible" efivar-dp.h header. At the moment, it's really a 34 * very thin, minimal interface. 35 */ 36 37 /* 38 * Generic EFI_DEVICE_PATH, spelled the Linux way. We use this 39 * interface to the outside world and type-pun to the EFI EDK2 code 40 * we use to implement it. 41 */ 42 typedef struct { 43 uint8_t type; 44 uint8_t subtype; 45 uint16_t length; 46 } __packed efidp_header; 47 48 /* NB: Linux has shadow types for all dp type */ 49 50 typedef union { 51 efidp_header header; 52 } efidp_data; 53 typedef efidp_data *efidp; 54 typedef const efidp_data *const_efidp; 55 56 /** format a device path into UEFI standard conforming output. 57 * 58 * NB: FreeBSD's implementation is taken from EDK2, while Linux's 59 * was hand-rolled. There may be differences as a result. 60 */ 61 ssize_t efidp_format_device_path(char *buf, size_t len, const_efidp dp, 62 ssize_t max); 63 ssize_t efidp_format_device_path_node(char *buf, size_t len, const_efidp dp); 64 ssize_t efidp_parse_device_path(char *path, efidp out, size_t max); 65 char * efidp_extract_file_path(const_efidp dp); 66 67 size_t efidp_size(const_efidp); 68 69 int efivar_device_path_to_unix_path(const_efidp dp, char **dev, char **relpath, char **abspath); 70 int efivar_unix_path_to_device_path(const char *path, efidp *dp); 71 72 #endif /* _EFIVAR_DP_H_ */ 73