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 /* 35 * This list of callback bindings is static, but may be overridden by defining 36 * a new association in the ".callbacks" environment variable. 37 */ 38 #define ENV_CALLBACK_LIST_STATIC ENV_CALLBACK_VAR ":callbacks," \ 39 ENV_FLAGS_VAR ":flags," \ 40 "baudrate:baudrate," \ 41 "bootfile:bootfile," \ 42 "loadaddr:loadaddr," \ 43 SILENT_CALLBACK \ 44 SPLASHIMAGE_CALLBACK \ 45 "stdin:console,stdout:console,stderr:console," \ 46 CONFIG_ENV_CALLBACK_LIST_STATIC 47 48 struct env_clbk_tbl { 49 const char *name; /* Callback name */ 50 int (*callback)(const char *name, const char *value, enum env_op op, 51 int flags); 52 }; 53 54 void env_callback_init(ENTRY *var_entry); 55 56 /* 57 * Define a callback that can be associated with variables. 58 * when associated through the ".callbacks" environment variable, the callback 59 * will be executed any time the variable is inserted, overwritten, or deleted. 60 */ 61 #ifdef CONFIG_SPL_BUILD 62 #define U_BOOT_ENV_CALLBACK(name, callback) \ 63 static inline __maybe_unused void _u_boot_env_noop_##name(void) \ 64 { \ 65 (void)callback; \ 66 } 67 #else 68 #define U_BOOT_ENV_CALLBACK(name, callback) \ 69 ll_entry_declare(struct env_clbk_tbl, name, env_clbk) = \ 70 {#name, callback} 71 #endif 72 73 #endif /* __ENV_CALLBACK_H__ */ 74