efienv.c revision 332154 
1/*-
2 * Copyright (c) 2018 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 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27#include <sys/cdefs.h>
28__FBSDID("$FreeBSD: stable/11/stand/efi/libefi/efienv.c 332154 2018-04-06 21:37:25Z kevans $");
29
30#include <stand.h>
31#include <efi.h>
32#include <efichar.h>
33#include <efilib.h>
34
35static EFI_GUID FreeBSDBootVarGUID = FREEBSD_BOOT_VAR_GUID;
36static EFI_GUID GlobalBootVarGUID = UEFI_BOOT_VAR_GUID;
37
38EFI_STATUS
39efi_getenv(EFI_GUID *g, const char *v, void *data, size_t *len)
40{
41	size_t ul;
42	CHAR16 *uv;
43	UINT32 attr;
44	UINTN dl;
45	EFI_STATUS rv;
46
47	uv = NULL;
48	if (utf8_to_ucs2(v, &uv, &ul) != 0)
49		return (EFI_OUT_OF_RESOURCES);
50	dl = *len;
51	rv = RS->GetVariable(uv, g, &attr, &dl, data);
52	if (rv == EFI_SUCCESS)
53		*len = dl;
54	free(uv);
55	return (rv);
56}
57
58EFI_STATUS
59efi_global_getenv(const char *v, void *data, size_t *len)
60{
61
62	return (efi_getenv(&GlobalBootVarGUID, v, data, len));
63}
64
65EFI_STATUS
66efi_freebsd_getenv(const char *v, void *data, size_t *len)
67{
68
69	return (efi_getenv(&FreeBSDBootVarGUID, v, data, len));
70}
71
72EFI_STATUS
73efi_setenv_freebsd_wcs(const char *varname, CHAR16 *valstr)
74{
75	CHAR16 *var = NULL;
76	size_t len;
77	EFI_STATUS rv;
78
79	if (utf8_to_ucs2(varname, &var, &len) != 0)
80		return (EFI_OUT_OF_RESOURCES);
81	rv = RS->SetVariable(var, &FreeBSDBootVarGUID,
82	    EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS,
83	    (ucs2len(valstr) + 1) * sizeof(efi_char), valstr);
84	free(var);
85	return (rv);
86}
87
88