include/env_callback.h

   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 #define ETHADDR_WILDCARD "\\d?"
  37 #else
  38 #define ENV_DOT_ESCAPE
  39 #define ETHADDR_WILDCARD
  40 #endif
  41
  42 #ifdef CONFIG_CMD_DNS
  43 #define DNS_CALLBACK "dnsip:dnsip,"
  44 #else
  45 #define DNS_CALLBACK
  46 #endif
  47
  48 #ifdef CONFIG_NET
  49 #define NET_CALLBACKS \
  50         "bootfile:bootfile," \
  51         "ipaddr:ipaddr," \
  52         "gatewayip:gatewayip," \
  53         "netmask:netmask," \
  54         "serverip:serverip," \
  55         "nvlan:nvlan," \
  56         "vlan:vlan," \
  57         DNS_CALLBACK \
  58         "eth" ETHADDR_WILDCARD "addr:ethaddr,"
  59 #else
  60 #define NET_CALLBACKS
  61 #endif
  62
  63 /*
  64  * This list of callback bindings is static, but may be overridden by defining
  65  * a new association in the ".callbacks" environment variable.
  66  */
  67 #define ENV_CALLBACK_LIST_STATIC ENV_DOT_ESCAPE ENV_CALLBACK_VAR ":callbacks," \
  68         ENV_DOT_ESCAPE ENV_FLAGS_VAR ":flags," \
  69         "baudrate:baudrate," \
  70         NET_CALLBACKS \
  71         "loadaddr:loadaddr," \
  72         SILENT_CALLBACK \
  73         SPLASHIMAGE_CALLBACK \
  74         "stdin:console,stdout:console,stderr:console," \
  75         CONFIG_ENV_CALLBACK_LIST_STATIC
  76
  77 struct env_clbk_tbl {
  78         const char *name;               /* Callback name */
  79         int (*callback)(const char *name, const char *value, enum env_op op,
  80                 int flags);
  81 };
  82
  83 void env_callback_init(ENTRY *var_entry);
  84
  85 /*
  86  * Define a callback that can be associated with variables.
  87  * when associated through the ".callbacks" environment variable, the callback
  88  * will be executed any time the variable is inserted, overwritten, or deleted.
  89  */
  90 #ifdef CONFIG_SPL_BUILD
  91 #define U_BOOT_ENV_CALLBACK(name, callback) \
  92         static inline __maybe_unused void _u_boot_env_noop_##name(void) \
  93         { \
  94                 (void)callback; \
  95         }
  96 #else
  97 #define U_BOOT_ENV_CALLBACK(name, callback) \
  98         ll_entry_declare(struct env_clbk_tbl, name, env_clbk) = \
  99         {#name, callback}
 100 #endif
 101
 102 #endif /* __ENV_CALLBACK_H__ */