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Joe Hershberger170ab112012-12-11 22:16:24 -06001/*
2 * (C) Copyright 2012
3 * Joe Hershberger, National Instruments, joe.hershberger@ni.com
4 *
5 * See file CREDITS for list of people who contributed to this
6 * project.
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License as
10 * published by the Free Software Foundation; either version 2 of
11 * the License, or (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
21 * MA 02111-1307 USA
22 */
23
24#ifndef __ENV_CALLBACK_H__
25#define __ENV_CALLBACK_H__
26
Joe Hershberger25980902012-12-11 22:16:31 -060027#include <env_flags.h>
Joe Hershberger170ab112012-12-11 22:16:24 -060028#include <linker_lists.h>
29#include <search.h>
30
31#define ENV_CALLBACK_VAR ".callbacks"
32
33/* Board configs can define additional static callback bindings */
34#ifndef CONFIG_ENV_CALLBACK_LIST_STATIC
35#define CONFIG_ENV_CALLBACK_LIST_STATIC
36#endif
37
Joe Hershbergere080d542012-12-11 22:16:30 -060038#ifdef CONFIG_SILENT_CONSOLE
39#define SILENT_CALLBACK "silent:silent,"
40#else
41#define SILENT_CALLBACK
42#endif
43
Nikita Kiryanovc0880482013-02-24 21:28:43 +000044#ifdef CONFIG_SPLASHIMAGE_GUARD
45#define SPLASHIMAGE_CALLBACK "splashimage:splashimage,"
46#else
47#define SPLASHIMAGE_CALLBACK
48#endif
49
Joe Hershberger170ab112012-12-11 22:16:24 -060050/*
51 * This list of callback bindings is static, but may be overridden by defining
52 * a new association in the ".callbacks" environment variable.
53 */
54#define ENV_CALLBACK_LIST_STATIC ENV_CALLBACK_VAR ":callbacks," \
Joe Hershberger25980902012-12-11 22:16:31 -060055 ENV_FLAGS_VAR ":flags," \
Joe Hershberger32057712012-12-11 22:16:27 -060056 "baudrate:baudrate," \
Joe Hershbergera9f51c92012-12-11 22:16:26 -060057 "bootfile:bootfile," \
Joe Hershberger1cf0a8b2012-12-11 22:16:28 -060058 "loadaddr:loadaddr," \
Joe Hershbergere080d542012-12-11 22:16:30 -060059 SILENT_CALLBACK \
Nikita Kiryanovc0880482013-02-24 21:28:43 +000060 SPLASHIMAGE_CALLBACK \
Joe Hershberger849d5d92012-12-11 22:16:29 -060061 "stdin:console,stdout:console,stderr:console," \
Joe Hershberger170ab112012-12-11 22:16:24 -060062 CONFIG_ENV_CALLBACK_LIST_STATIC
63
64struct env_clbk_tbl {
65 const char *name; /* Callback name */
66 int (*callback)(const char *name, const char *value, enum env_op op,
67 int flags);
68};
69
Joe Hershberger170ab112012-12-11 22:16:24 -060070void env_callback_init(ENTRY *var_entry);
71
72/*
73 * Define a callback that can be associated with variables.
74 * when associated through the ".callbacks" environment variable, the callback
75 * will be executed any time the variable is inserted, overwritten, or deleted.
76 */
Scott Woodf8cfcf12012-12-20 11:51:05 +000077#ifdef CONFIG_SPL_BUILD
78#define U_BOOT_ENV_CALLBACK(name, callback) \
79 static inline void _u_boot_env_noop_##name(void) \
80 { \
81 (void)callback; \
82 }
83#else
Joe Hershberger170ab112012-12-11 22:16:24 -060084#define U_BOOT_ENV_CALLBACK(name, callback) \
Albert ARIBAUDef123c52013-02-25 00:59:00 +000085 ll_entry_declare(struct env_clbk_tbl, name, env_clbk) = \
Joe Hershberger170ab112012-12-11 22:16:24 -060086 {#name, callback}
Scott Woodf8cfcf12012-12-20 11:51:05 +000087#endif
Joe Hershberger170ab112012-12-11 22:16:24 -060088
89#endif /* __ENV_CALLBACK_H__ */