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