1 /* 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 27 #include <env_flags.h> 28 #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 38 #ifdef CONFIG_SILENT_CONSOLE 39 #define SILENT_CALLBACK "silent:silent," 40 #else 41 #define SILENT_CALLBACK 42 #endif 43 44 #ifdef CONFIG_SPLASHIMAGE_GUARD 45 #define SPLASHIMAGE_CALLBACK "splashimage:splashimage," 46 #else 47 #define SPLASHIMAGE_CALLBACK 48 #endif 49 50 /* 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," \ 55 ENV_FLAGS_VAR ":flags," \ 56 "baudrate:baudrate," \ 57 "bootfile:bootfile," \ 58 "loadaddr:loadaddr," \ 59 SILENT_CALLBACK \ 60 SPLASHIMAGE_CALLBACK \ 61 "stdin:console,stdout:console,stderr:console," \ 62 CONFIG_ENV_CALLBACK_LIST_STATIC 63 64 struct 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 70 struct env_clbk_tbl *find_env_callback(const char *); 71 void env_callback_init(ENTRY *var_entry); 72 73 /* 74 * Define a callback that can be associated with variables. 75 * when associated through the ".callbacks" environment variable, the callback 76 * will be executed any time the variable is inserted, overwritten, or deleted. 77 */ 78 #ifdef CONFIG_SPL_BUILD 79 #define U_BOOT_ENV_CALLBACK(name, callback) \ 80 static inline void _u_boot_env_noop_##name(void) \ 81 { \ 82 (void)callback; \ 83 } 84 #else 85 #define U_BOOT_ENV_CALLBACK(name, callback) \ 86 ll_entry_declare(struct env_clbk_tbl, name, env_clbk) = \ 87 {#name, callback} 88 #endif 89 90 #endif /* __ENV_CALLBACK_H__ */ 91