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 * in this position and unchanged. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 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_parse_device_path(char *path, efidp out, size_t max); 64 65 size_t efidp_size(const_efidp); 66 67 #endif /* _EFIVAR_DP_H_ */ 68