7270962aa5
This commit implements the (mostly?) Linux compatible efidp_format_device_path and efidp_parse_device_path APIs. These are the only APIs exposed through this library. However, they are built on code from Tianocore's EDK2 MdePkg. They are brought in as new files here for reasons described in FreeBSD-update. Symbol versioning will be introduced to control what's exported from the EDK2 code. Some structural changes may be necessary when we move to sharing with sys/boot/efi. Sponsored by: Netflix
66 lines
2.3 KiB
C
66 lines
2.3 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_parse_device_path(char *path, efidp out, size_t max);
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#endif /* _EFIVAR_DP_H_ */
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