env_callback.h 2.37 KB
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/*
 * (C) Copyright 2012
 * Joe Hershberger, National Instruments, joe.hershberger@ni.com
 *
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 * SPDX-License-Identifier:	GPL-2.0+
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 */

#ifndef __ENV_CALLBACK_H__
#define __ENV_CALLBACK_H__

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#include <env_flags.h>
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#include <linker_lists.h>
#include <search.h>

#define ENV_CALLBACK_VAR ".callbacks"

/* Board configs can define additional static callback bindings */
#ifndef CONFIG_ENV_CALLBACK_LIST_STATIC
#define CONFIG_ENV_CALLBACK_LIST_STATIC
#endif

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#ifdef CONFIG_SILENT_CONSOLE
#define SILENT_CALLBACK "silent:silent,"
#else
#define SILENT_CALLBACK
#endif

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#ifdef CONFIG_SPLASHIMAGE_GUARD
#define SPLASHIMAGE_CALLBACK "splashimage:splashimage,"
#else
#define SPLASHIMAGE_CALLBACK
#endif

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#ifdef CONFIG_REGEX
#define ENV_DOT_ESCAPE "\\"
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#define ETHADDR_WILDCARD "\\d?"
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#else
#define ENV_DOT_ESCAPE
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#define ETHADDR_WILDCARD
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#endif

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#ifdef CONFIG_CMD_DNS
#define DNS_CALLBACK "dnsip:dnsip,"
#else
#define DNS_CALLBACK
#endif

#ifdef CONFIG_NET
#define NET_CALLBACKS \
	"bootfile:bootfile," \
	"ipaddr:ipaddr," \
	"gatewayip:gatewayip," \
	"netmask:netmask," \
	"serverip:serverip," \
	"nvlan:nvlan," \
	"vlan:vlan," \
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	DNS_CALLBACK \
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	"eth" ETHADDR_WILDCARD "addr:ethaddr,"
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#else
#define NET_CALLBACKS
#endif

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/*
 * This list of callback bindings is static, but may be overridden by defining
 * a new association in the ".callbacks" environment variable.
 */
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#define ENV_CALLBACK_LIST_STATIC ENV_DOT_ESCAPE ENV_CALLBACK_VAR ":callbacks," \
	ENV_DOT_ESCAPE ENV_FLAGS_VAR ":flags," \
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	"baudrate:baudrate," \
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	NET_CALLBACKS \
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	"loadaddr:loadaddr," \
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	SILENT_CALLBACK \
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	SPLASHIMAGE_CALLBACK \
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	"stdin:console,stdout:console,stderr:console," \
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	CONFIG_ENV_CALLBACK_LIST_STATIC

struct env_clbk_tbl {
	const char *name;		/* Callback name */
	int (*callback)(const char *name, const char *value, enum env_op op,
		int flags);
};

void env_callback_init(ENTRY *var_entry);

/*
 * 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.
 */
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#ifdef CONFIG_SPL_BUILD
#define U_BOOT_ENV_CALLBACK(name, callback) \
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	static inline __maybe_unused void _u_boot_env_noop_##name(void) \
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	{ \
		(void)callback; \
	}
#else
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#define U_BOOT_ENV_CALLBACK(name, callback) \
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	ll_entry_declare(struct env_clbk_tbl, name, env_clbk) = \
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	{#name, callback}
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#endif
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#endif /* __ENV_CALLBACK_H__ */