X-Git-Url: http://review.tizen.org/git/?a=blobdiff_plain;f=include%2Fenv.h;h=d6c2d751d62b6cc7eb3bbf9a108b36be14a8a486;hb=2493ce6258a59881b702cbe255db9e53f1e3fd13;hp=b59c3c36f20238ccd61f38cb1a3772c45e925b24;hpb=db19701039bc78b5870d74e0d7ecaf4f9e4d8d87;p=platform%2Fkernel%2Fu-boot.git

diff --git a/include/env.h b/include/env.h
index b59c3c3..d6c2d75 100644
--- a/include/env.h
+++ b/include/env.h
@@ -9,6 +9,7 @@
 #ifndef __ENV_H
 #define __ENV_H
 
+#include <compiler.h>
 #include <stdbool.h>
 #include <linux/types.h>
 
@@ -21,6 +22,46 @@ enum env_valid {
 	ENV_REDUND,	/* Redundant environment is valid */
 };
 
+/** 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,
+};
+
 /**
  * env_get_id() - Gets a sequence number for the environment
  *
@@ -72,6 +113,16 @@ int env_match(unsigned char *name, int index);
  */
 char *env_get(const char *varname);
 
+/*
+ * Like env_get, but prints an error if envvar isn't defined in the
+ * environment.  It always returns what env_get does, so it can be used in
+ * place of env_get without changing error handling otherwise.
+ *
+ * @varname:	Variable to look up
+ * @return value of variable, or NULL if not found
+ */
+char *from_env(const char *envvar);
+
 /**
  * env_get_f() - Look up the value of an environment variable (early)
  *