1 /* 2 * (C) Copyright 2012 3 * Joe Hershberger, National Instruments, joe.hershberger@ni.com 4 * 5 * SPDX-License-Identifier: GPL-2.0+ 6 */ 7 8 #ifndef __ENV_CALLBACK_H__ 9 #define __ENV_CALLBACK_H__ 10 11 #include <env_flags.h> 12 #include <linker_lists.h> 13 #include <search.h> 14 15 #define ENV_CALLBACK_VAR ".callbacks" 16 17 /* Board configs can define additional static callback bindings */ 18 #ifndef CONFIG_ENV_CALLBACK_LIST_STATIC 19 #define CONFIG_ENV_CALLBACK_LIST_STATIC 20 #endif 21 22 #ifdef CONFIG_SILENT_CONSOLE 23 #define SILENT_CALLBACK "silent:silent," 24 #else 25 #define SILENT_CALLBACK 26 #endif 27 28 #ifdef CONFIG_SPLASHIMAGE_GUARD 29 #define SPLASHIMAGE_CALLBACK "splashimage:splashimage," 30 #else 31 #define SPLASHIMAGE_CALLBACK 32 #endif 33 34 #ifdef CONFIG_REGEX 35 #define ENV_DOT_ESCAPE "\\" 36 #else 37 #define ENV_DOT_ESCAPE 38 #endif 39 40 /* 41 * This list of callback bindings is static, but may be overridden by defining 42 * a new association in the ".callbacks" environment variable. 43 */ 44 #define ENV_CALLBACK_LIST_STATIC ENV_DOT_ESCAPE ENV_CALLBACK_VAR ":callbacks," \ 45 ENV_DOT_ESCAPE ENV_FLAGS_VAR ":flags," \ 46 "baudrate:baudrate," \ 47 "bootfile:bootfile," \ 48 "loadaddr:loadaddr," \ 49 SILENT_CALLBACK \ 50 SPLASHIMAGE_CALLBACK \ 51 "stdin:console,stdout:console,stderr:console," \ 52 CONFIG_ENV_CALLBACK_LIST_STATIC 53 54 struct env_clbk_tbl { 55 const char *name; /* Callback name */ 56 int (*callback)(const char *name, const char *value, enum env_op op, 57 int flags); 58 }; 59 60 void env_callback_init(ENTRY *var_entry); 61 62 /* 63 * Define a callback that can be associated with variables. 64 * when associated through the ".callbacks" environment variable, the callback 65 * will be executed any time the variable is inserted, overwritten, or deleted. 66 */ 67 #ifdef CONFIG_SPL_BUILD 68 #define U_BOOT_ENV_CALLBACK(name, callback) \ 69 static inline __maybe_unused void _u_boot_env_noop_##name(void) \ 70 { \ 71 (void)callback; \ 72 } 73 #else 74 #define U_BOOT_ENV_CALLBACK(name, callback) \ 75 ll_entry_declare(struct env_clbk_tbl, name, env_clbk) = \ 76 {#name, callback} 77 #endif 78 79 #endif /* __ENV_CALLBACK_H__ */ 80