1// SPDX-License-Identifier: GPL-2.0+
2/*
3 *  EFI boot manager
4 *
5 *  Copyright (c) 2018 AKASHI Takahiro, et.al.
6 */
7
8#define LOG_CATEGORY LOGC_EFI
9
10#include <charset.h>
11#include <log.h>
12#include <malloc.h>
13#include <efi_loader.h>
14#include <asm/unaligned.h>
15
16/**
17 * efi_set_load_options() - set the load options of a loaded image
18 *
19 * @handle:		the image handle
20 * @load_options_size:	size of load options
21 * @load_options:	pointer to load options
22 * Return:		status code
23 */
24efi_status_t efi_set_load_options(efi_handle_t handle,
25				  efi_uintn_t load_options_size,
26				  void *load_options)
27{
28	struct efi_loaded_image *loaded_image_info;
29	struct efi_handler *handler;
30	efi_status_t ret;
31
32	ret = efi_search_protocol(handle, &efi_guid_loaded_image, &handler);
33	if (ret != EFI_SUCCESS)
34		return EFI_INVALID_PARAMETER;
35
36	loaded_image_info = handler->protocol_interface;
37	loaded_image_info->load_options = load_options;
38	loaded_image_info->load_options_size = load_options_size;
39
40	return EFI_SUCCESS;
41}
42
43/**
44 * efi_deserialize_load_option() - parse serialized data
45 *
46 * Parse serialized data describing a load option and transform it to the
47 * efi_load_option structure.
48 *
49 * @lo:		pointer to target
50 * @data:	serialized data
51 * @size:	size of the load option, on return size of the optional data
52 * Return:	status code
53 */
54efi_status_t efi_deserialize_load_option(struct efi_load_option *lo, u8 *data,
55					 efi_uintn_t *size)
56{
57	efi_uintn_t len;
58
59	len = sizeof(u32);
60	if (*size < len + 2 * sizeof(u16))
61		return EFI_INVALID_PARAMETER;
62	lo->attributes = get_unaligned_le32(data);
63	data += len;
64	*size -= len;
65
66	len = sizeof(u16);
67	lo->file_path_length = get_unaligned_le16(data);
68	data += len;
69	*size -= len;
70
71	lo->label = (u16 *)data;
72	len = u16_strnlen(lo->label, *size / sizeof(u16) - 1);
73	if (lo->label[len])
74		return EFI_INVALID_PARAMETER;
75	len = (len + 1) * sizeof(u16);
76	if (*size < len)
77		return EFI_INVALID_PARAMETER;
78	data += len;
79	*size -= len;
80
81	len = lo->file_path_length;
82	if (*size < len)
83		return EFI_INVALID_PARAMETER;
84	lo->file_path = (struct efi_device_path *)data;
85	if (efi_dp_check_length(lo->file_path, len) < 0)
86		return EFI_INVALID_PARAMETER;
87	data += len;
88	*size -= len;
89
90	lo->optional_data = data;
91
92	return EFI_SUCCESS;
93}
94
95/**
96 * efi_serialize_load_option() - serialize load option
97 *
98 * Serialize efi_load_option structure into byte stream for BootXXXX.
99 *
100 * @data:	buffer for serialized data
101 * @lo:		load option
102 * Return:	size of allocated buffer
103 */
104unsigned long efi_serialize_load_option(struct efi_load_option *lo, u8 **data)
105{
106	unsigned long label_len;
107	unsigned long size;
108	u8 *p;
109
110	label_len = u16_strsize(lo->label);
111
112	/* total size */
113	size = sizeof(lo->attributes);
114	size += sizeof(lo->file_path_length);
115	size += label_len;
116	size += lo->file_path_length;
117	if (lo->optional_data)
118		size += (utf8_utf16_strlen((const char *)lo->optional_data)
119					   + 1) * sizeof(u16);
120	p = malloc(size);
121	if (!p)
122		return 0;
123
124	/* copy data */
125	*data = p;
126	memcpy(p, &lo->attributes, sizeof(lo->attributes));
127	p += sizeof(lo->attributes);
128
129	memcpy(p, &lo->file_path_length, sizeof(lo->file_path_length));
130	p += sizeof(lo->file_path_length);
131
132	memcpy(p, lo->label, label_len);
133	p += label_len;
134
135	memcpy(p, lo->file_path, lo->file_path_length);
136	p += lo->file_path_length;
137
138	if (lo->optional_data) {
139		utf8_utf16_strcpy((u16 **)&p, (const char *)lo->optional_data);
140		p += sizeof(u16); /* size of trailing \0 */
141	}
142	return size;
143}
144