1/*-
2 * Copyright (c) 2018 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
26#include <sys/cdefs.h>
27__FBSDID("$FreeBSD$");
28
29#include <stand.h>
30#include <efi.h>
31#include <efichar.h>
32#include <efilib.h>
33
34static EFI_GUID FreeBSDBootVarGUID = FREEBSD_BOOT_VAR_GUID;
35static EFI_GUID GlobalBootVarGUID = EFI_GLOBAL_VARIABLE;
36
37EFI_STATUS
38efi_getenv(EFI_GUID *g, const char *v, void *data, size_t *len)
39{
40	size_t ul;
41	CHAR16 *uv;
42	UINT32 attr;
43	UINTN dl;
44	EFI_STATUS rv;
45
46	uv = NULL;
47	if (utf8_to_ucs2(v, &uv, &ul) != 0)
48		return (EFI_OUT_OF_RESOURCES);
49	dl = *len;
50	rv = RS->GetVariable(uv, g, &attr, &dl, data);
51	if (rv == EFI_SUCCESS || rv == EFI_BUFFER_TOO_SMALL)
52		*len = dl;
53	free(uv);
54	return (rv);
55}
56
57EFI_STATUS
58efi_global_getenv(const char *v, void *data, size_t *len)
59{
60
61	return (efi_getenv(&GlobalBootVarGUID, v, data, len));
62}
63
64EFI_STATUS
65efi_freebsd_getenv(const char *v, void *data, size_t *len)
66{
67
68	return (efi_getenv(&FreeBSDBootVarGUID, v, data, len));
69}
70
71/*
72 * efi_setenv -- Sets an env variable.
73 */
74EFI_STATUS
75efi_setenv(EFI_GUID *guid, const char *varname, UINT32 attr, void *data, __size_t len)
76{
77	EFI_STATUS rv;
78	CHAR16 *uv;
79	size_t ul;
80
81	uv = NULL;
82	if (utf8_to_ucs2(varname, &uv, &ul) != 0)
83		return (EFI_OUT_OF_RESOURCES);
84
85	rv = RS->SetVariable(uv, guid, attr, len, data);
86	free(uv);
87	return (rv);
88}
89
90EFI_STATUS
91efi_setenv_freebsd_wcs(const char *varname, CHAR16 *valstr)
92{
93	CHAR16 *var = NULL;
94	size_t len;
95	EFI_STATUS rv;
96
97	if (utf8_to_ucs2(varname, &var, &len) != 0)
98		return (EFI_OUT_OF_RESOURCES);
99	rv = RS->SetVariable(var, &FreeBSDBootVarGUID,
100	    EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS,
101	    (ucs2len(valstr) + 1) * sizeof(efi_char), valstr);
102	free(var);
103	return (rv);
104}
105
106/*
107 * efi_delenv -- deletes the specified env variable
108 */
109EFI_STATUS
110efi_delenv(EFI_GUID *guid, const char *name)
111{
112	CHAR16 *var;
113	size_t len;
114	EFI_STATUS rv;
115
116	var = NULL;
117	if (utf8_to_ucs2(name, &var, &len) != 0)
118		return (EFI_OUT_OF_RESOURCES);
119
120	rv = RS->SetVariable(var, guid, 0, 0, NULL);
121	free(var);
122	return (rv);
123}
124
125EFI_STATUS
126efi_freebsd_delenv(const char *name)
127{
128	return (efi_delenv(&FreeBSDBootVarGUID, name));
129}
130