+/** enum env_op - environment callback operation */
+enum env_op {
+ env_op_create,
+ env_op_delete,
+ env_op_overwrite,
+};
+
+/** struct env_clbk_tbl - declares a new callback */
+struct env_clbk_tbl {
+ const char *name; /* Callback name */
+ int (*callback)(const char *name, const char *value, enum env_op op,
+ int flags);
+};
+
+/*
+ * Define a callback that can be associated with variables.
+ * when associated through the ".callbacks" environment variable, the callback
+ * will be executed any time the variable is inserted, overwritten, or deleted.
+ *
+ * For SPL these are silently dropped to reduce code size, since environment
+ * callbacks are not supported with SPL.
+ */
+#ifdef CONFIG_SPL_BUILD
+#define U_BOOT_ENV_CALLBACK(name, callback) \
+ static inline __maybe_unused void _u_boot_env_noop_##name(void) \
+ { \
+ (void)callback; \
+ }
+#else
+#define U_BOOT_ENV_CALLBACK(name, callback) \
+ ll_entry_declare(struct env_clbk_tbl, name, env_clbk) = \
+ {#name, callback}
+#endif
+
+/** enum env_redund_flags - Flags for the redundand_environment */
+enum env_redund_flags {
+ ENV_REDUND_OBSOLETE = 0,
+ ENV_REDUND_ACTIVE = 1,
+};
+