lib/libefivar/efivar.h

   1 /*-
   2  * Copyright (c) 2016 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  * $FreeBSD: head/lib/libefivar/efivar.h 343755 2019-02-04 21:28:25Z imp $
  26  */
  27
  28 #ifndef _EFIVAR_H_
  29 #define _EFIVAR_H_
  30
  31 #include <uuid.h>
  32 #include <sys/efi.h>
  33 #include <sys/endian.h>
  34 #include <stdint.h>
  35
  36 /* Shoud these be elsewhere ? */
  37 #define EFI_VARIABLE_NON_VOLATILE               0x00000001
  38 #define EFI_VARIABLE_BOOTSERVICE_ACCESS         0x00000002
  39 #define EFI_VARIABLE_RUNTIME_ACCESS             0x00000004
  40 #define EFI_VARIABLE_HARDWARE_ERROR_RECORD      0x00000008
  41 #define EFI_VARIABLE_AUTHENTICATED_WRITE_ACCESS 0x00000010
  42 #define EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS \
  43                                                 0x00000020
  44 #define EFI_VARIABLE_APPEND_WRITE               0x00000040
  45 #if 0 /* todo */
  46 #define EFI_VARIABLE_HAS_AUTH_HEADER
  47 #define EFI_VARIABLE_HAS_SIGNATURE
  48 #endif
  49
  50
  51 #ifndef _EFIVAR_EFI_GUID_T_DEF
  52 #define _EFIVAR_EFI_GUID_T_DEF
  53 typedef uuid_t efi_guid_t;
  54 #endif
  55
  56 #if BYTE_ORDER == LITTLE_ENDIAN
  57 #define EFI_GUID(a, b, c, d, e0, e1, e2, e3, e4, e5)                    \
  58         ((efi_guid_t) {(a), (b), (c), (d) >> 8, (d) & 0xff,             \
  59         { (e0), (e1), (e2), (e3), (e4), (e5) }})
  60 #else
  61 #define EFI_GUID(a, b, c, d, e0, e1, e2, e3, e4, e5)                    \
  62         ((efi_guid_t) {(a), (b), (c), (d) & 0xff, (d) >> 8,             \
  63         { (e0), (e1), (e2), (e3), (e4), (e5) }})
  64 #endif
  65
  66 #define EFI_GLOBAL_GUID EFI_GUID(0x8be4df61, 0x93ca, 0x11d2, 0xaa0d, \
  67     0x00, 0xe0, 0x98, 0x03, 0x2b, 0x8c)
  68
  69 int efi_append_variable(efi_guid_t guid, const char *name,
  70     uint8_t *data, size_t data_size, uint32_t attributes);
  71 int efi_del_variable(efi_guid_t guid, const char *name);
  72 int efi_get_variable(efi_guid_t guid, const char *name,
  73     uint8_t **data, size_t *data_size, uint32_t *attributes);
  74 int efi_get_variable_attributes(efi_guid_t guid, const char *name,
  75     uint32_t *attributes);
  76 int efi_get_variable_size(efi_guid_t guid, const char *name, size_t *size);
  77 int efi_get_next_variable_name(efi_guid_t **guid, char **name);
  78 int efi_guid_cmp(const efi_guid_t *guid1, const efi_guid_t *guid2);
  79 int efi_guid_is_zero(const efi_guid_t *guid1);
  80 int efi_guid_to_name(efi_guid_t *guid, char **name);
  81 int efi_guid_to_symbol(efi_guid_t *guid, char **symbol);
  82 int efi_guid_to_str(const efi_guid_t *guid, char **sp);
  83 int efi_name_to_guid(const char *name, efi_guid_t *guid);
  84 int efi_set_variable(efi_guid_t guid, const char *name,
  85     uint8_t *data, size_t data_size, uint32_t attributes);
  86 int efi_str_to_guid(const char *s, efi_guid_t *guid);
  87 int efi_variables_supported(void);
  88
  89 /* FreeBSD extensions */
  90 struct uuid_table
  91 {
  92         const char *uuid_str;
  93         const char *name;
  94         efi_guid_t guid;
  95 };
  96
  97 int efi_known_guid(struct uuid_table **);
  98
  99 extern const efi_guid_t efi_guid_empty;
 100
 101 #endif /* _EFIVAR_H_ */