1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
|
/* SPDX-License-Identifier: GPL-2.0+ */
/*
* Internal environment header file. This includes direct access to environment
* information such as its size and offset, direct access to the default
* environment and embedded environment (if used). It also provides environment
* drivers with various declarations.
*
* It should not be included by board files, drivers and code other than that
* related to the environment implementation.
*
* (C) Copyright 2002
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
*/
#ifndef _ENV_INTERNAL_H_
#define _ENV_INTERNAL_H_
#include <linux/kconfig.h>
/**************************************************************************
*
* The "environment" is stored as a list of '\0' terminated
* "name=value" strings. The end of the list is marked by a double
* '\0'. New entries are always added at the end. Deleting an entry
* shifts the remaining entries to the front. Replacing an entry is a
* combination of deleting the old value and adding the new one.
*
* The environment is preceded by a 32 bit CRC over the data part.
*
*************************************************************************/
#if defined(CONFIG_ENV_IS_IN_FLASH)
# if defined(CONFIG_ENV_ADDR_REDUND) && \
((CONFIG_ENV_ADDR >= CONFIG_SYS_MONITOR_BASE) && \
(CONFIG_ENV_ADDR_REDUND + CONFIG_ENV_SIZE) <= \
(CONFIG_SYS_MONITOR_BASE + CONFIG_SYS_MONITOR_LEN))
# define ENV_IS_EMBEDDED
# endif
# if (CONFIG_ENV_ADDR >= CONFIG_SYS_MONITOR_BASE) && \
(CONFIG_ENV_ADDR + CONFIG_ENV_SIZE) <= \
(CONFIG_SYS_MONITOR_BASE + CONFIG_SYS_MONITOR_LEN)
# define ENV_IS_EMBEDDED
# endif
# ifdef CONFIG_ENV_IS_EMBEDDED
# error "do not define CONFIG_ENV_IS_EMBEDDED in your board config"
# error "it is calculated automatically for you"
# endif
#endif /* CONFIG_ENV_IS_IN_FLASH */
#if defined(CONFIG_ENV_IS_IN_NAND)
# if defined(CONFIG_ENV_OFFSET_OOB)
# ifdef CONFIG_ENV_OFFSET_REDUND
# error "CONFIG_ENV_OFFSET_REDUND is not supported when CONFIG_ENV_OFFSET_OOB"
# error "is set"
# endif
extern unsigned long nand_env_oob_offset;
# endif /* CONFIG_ENV_OFFSET_OOB */
#endif /* CONFIG_ENV_IS_IN_NAND */
/*
* For the flash types where embedded env is supported, but it cannot be
* calculated automatically (i.e. NAND), take the board opt-in.
*/
#if defined(CONFIG_ENV_IS_EMBEDDED) && !defined(ENV_IS_EMBEDDED)
# define ENV_IS_EMBEDDED
#endif
/* The build system likes to know if the env is embedded */
#ifdef DO_DEPS_ONLY
# ifdef ENV_IS_EMBEDDED
# ifndef CONFIG_ENV_IS_EMBEDDED
# define CONFIG_ENV_IS_EMBEDDED
# endif
# endif
#endif
#include "compiler.h"
#ifdef CONFIG_SYS_REDUNDAND_ENVIRONMENT
# define ENV_HEADER_SIZE (sizeof(uint32_t) + 1)
#else
# define ENV_HEADER_SIZE (sizeof(uint32_t))
#endif
#define ENV_SIZE (CONFIG_ENV_SIZE - ENV_HEADER_SIZE)
/*
* If the environment is in RAM, allocate extra space for it in the malloc
* region.
*/
#if defined(CONFIG_ENV_IS_EMBEDDED)
#define TOTAL_MALLOC_LEN CONFIG_SYS_MALLOC_LEN
#elif (CONFIG_ENV_ADDR + CONFIG_ENV_SIZE < CONFIG_SYS_MONITOR_BASE) || \
(CONFIG_ENV_ADDR >= CONFIG_SYS_MONITOR_BASE + CONFIG_SYS_MONITOR_LEN) || \
defined(CONFIG_ENV_IS_IN_NVRAM)
#define TOTAL_MALLOC_LEN (CONFIG_SYS_MALLOC_LEN + CONFIG_ENV_SIZE)
#else
#define TOTAL_MALLOC_LEN CONFIG_SYS_MALLOC_LEN
#endif
typedef struct environment_s {
uint32_t crc; /* CRC32 over data bytes */
#ifdef CONFIG_SYS_REDUNDAND_ENVIRONMENT
unsigned char flags; /* active/obsolete flags ENVF_REDUND_ */
#endif
unsigned char data[ENV_SIZE]; /* Environment data */
} env_t;
#ifdef ENV_IS_EMBEDDED
extern env_t embedded_environment;
#endif /* ENV_IS_EMBEDDED */
#ifdef DEFAULT_ENV_IS_RW
extern char default_environment[];
#else
extern const char default_environment[];
#endif
#ifndef DO_DEPS_ONLY
#include <env_attr.h>
#include <env_callback.h>
#include <env_flags.h>
#include <search.h>
enum env_location {
ENVL_UNKNOWN,
ENVL_EEPROM,
ENVL_EXT4,
ENVL_FAT,
ENVL_FLASH,
ENVL_MMC,
ENVL_NAND,
ENVL_NVRAM,
ENVL_ONENAND,
ENVL_REMOTE,
ENVL_SPI_FLASH,
ENVL_UBI,
ENVL_NOWHERE,
ENVL_COUNT,
};
/* value for the various operations we want to perform on the env */
enum env_operation {
ENVOP_GET_CHAR, /* we want to call the get_char function */
ENVOP_INIT, /* we want to call the init function */
ENVOP_LOAD, /* we want to call the load function */
ENVOP_SAVE, /* we want to call the save function */
ENVOP_ERASE, /* we want to call the erase function */
};
struct env_driver {
const char *name;
enum env_location location;
/**
* load() - Load the environment from storage
*
* This method is required for loading environment
*
* @return 0 if OK, -ve on error
*/
int (*load)(void);
/**
* save() - Save the environment to storage
*
* This method is required for 'saveenv' to work.
*
* @return 0 if OK, -ve on error
*/
int (*save)(void);
/**
* erase() - Erase the environment on storage
*
* This method is optional and required for 'eraseenv' to work.
*
* @return 0 if OK, -ve on error
*/
int (*erase)(void);
/**
* init() - Set up the initial pre-relocation environment
*
* This method is optional.
*
* @return 0 if OK, -ENOENT if no initial environment could be found,
* other -ve on error
*/
int (*init)(void);
};
/* Declare a new environment location driver */
#define U_BOOT_ENV_LOCATION(__name) \
ll_entry_declare(struct env_driver, __name, env_driver)
/* Declare the name of a location */
#ifdef CONFIG_CMD_SAVEENV
#define ENV_NAME(_name) .name = _name,
#else
#define ENV_NAME(_name)
#endif
#ifdef CONFIG_CMD_SAVEENV
#define env_save_ptr(x) x
#else
#define env_save_ptr(x) NULL
#endif
#define ENV_SAVE_PTR(x) (CONFIG_IS_ENABLED(SAVEENV) ? (x) : NULL)
#define ENV_ERASE_PTR(x) (CONFIG_IS_ENABLED(CMD_ERASEENV) ? (x) : NULL)
extern struct hsearch_data env_htab;
/**
* env_ext4_get_intf() - Provide the interface for env in EXT4
*
* It is a weak function allowing board to overidde the default interface for
* U-Boot env in EXT4: CONFIG_ENV_EXT4_INTERFACE
*
* Return: string of interface, empty if not supported
*/
const char *env_ext4_get_intf(void);
/**
* env_ext4_get_dev_part() - Provide the device and partition for env in EXT4
*
* It is a weak function allowing board to overidde the default device and
* partition used for U-Boot env in EXT4: CONFIG_ENV_EXT4_DEVICE_AND_PART
*
* Return: string of device and partition
*/
const char *env_ext4_get_dev_part(void);
/**
* env_get_location()- Provide the best location for the U-Boot environment
*
* It is a weak function allowing board to overidde the environment location
*
* @op: operations performed on the environment
* @prio: priority between the multiple environments, 0 being the
* highest priority
* Return: an enum env_location value on success, or -ve error code.
*/
enum env_location env_get_location(enum env_operation op, int prio);
#endif /* DO_DEPS_ONLY */
#endif /* _ENV_INTERNAL_H_ */
|
