09ee5d8ab6
efivar_device_path_to_unix_path translates from UEFI to Unix efivar_unix_path_to_device_path translates from Unix to UEFI At present, only HD() device types are supported (both GPT and MBR). CdRom and floppy devices aren't supported. ZFS isn't supported because there's no way in the UEFI standard to specify a ZFS datastore. Network devices aren't supported either. Three forms of Unix path are accepted: /path/to/file (for a mounted filesystem), //path/to/file (uses the EFI partition on the same disk as /), and dev:/path/to/file (for unmounted filesystem). Two forms are produced (the first and last). Sponsored by: Netflix
73 lines
2.6 KiB
C
73 lines
2.6 KiB
C
/*-
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* Copyright (c) 2017 Netflix, Inc.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer
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* in this position and unchanged.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _EFIVAR_DP_H_
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#define _EFIVAR_DP_H_
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/*
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* "Linux compatible" efivar-dp.h header. At the moment, it's really a
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* very thin, minimal interface.
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*/
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/*
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* Generic EFI_DEVICE_PATH, spelled the Linux way. We use this
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* interface to the outside world and type-pun to the EFI EDK2 code
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* we use to implement it.
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*/
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typedef struct {
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uint8_t type;
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uint8_t subtype;
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uint16_t length;
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} __packed efidp_header;
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/* NB: Linux has shadow types for all dp type */
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typedef union {
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efidp_header header;
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} efidp_data;
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typedef efidp_data *efidp;
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typedef const efidp_data *const_efidp;
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/** format a device path into UEFI standard conforming output.
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*
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* NB: FreeBSD's implementation is taken from EDK2, while Linux's
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* was hand-rolled. There may be differences as a result.
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*/
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ssize_t efidp_format_device_path(char *buf, size_t len, const_efidp dp,
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ssize_t max);
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ssize_t efidp_format_device_path_node(char *buf, size_t len, const_efidp dp);
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ssize_t efidp_parse_device_path(char *path, efidp out, size_t max);
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char * efidp_extract_file_path(const_efidp dp);
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size_t efidp_size(const_efidp);
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int efivar_device_path_to_unix_path(const_efidp dp, char **dev, char **relpath, char **abspath);
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int efivar_unix_path_to_device_path(const char *path, efidp *dp);
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#endif /* _EFIVAR_DP_H_ */
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