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