blob: ab4e115fb0678b280dfe3ce04bdafa4ed4c7f302
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 | /* |
35 | * This list of callback bindings is static, but may be overridden by defining |
36 | * a new association in the ".callbacks" environment variable. |
37 | */ |
38 | #define ENV_CALLBACK_LIST_STATIC ENV_CALLBACK_VAR ":callbacks," \ |
39 | ENV_FLAGS_VAR ":flags," \ |
40 | "baudrate:baudrate," \ |
41 | "bootfile:bootfile," \ |
42 | "loadaddr:loadaddr," \ |
43 | SILENT_CALLBACK \ |
44 | SPLASHIMAGE_CALLBACK \ |
45 | "stdin:console,stdout:console,stderr:console," \ |
46 | CONFIG_ENV_CALLBACK_LIST_STATIC |
47 | |
48 | struct env_clbk_tbl { |
49 | const char *name; /* Callback name */ |
50 | int (*callback)(const char *name, const char *value, enum env_op op, |
51 | int flags); |
52 | }; |
53 | |
54 | void env_callback_init(ENTRY *var_entry); |
55 | |
56 | /* |
57 | * Define a callback that can be associated with variables. |
58 | * when associated through the ".callbacks" environment variable, the callback |
59 | * will be executed any time the variable is inserted, overwritten, or deleted. |
60 | */ |
61 | #ifdef CONFIG_SPL_BUILD |
62 | #define U_BOOT_ENV_CALLBACK(name, callback) \ |
63 | static inline __maybe_unused void _u_boot_env_noop_##name(void) \ |
64 | { \ |
65 | (void)callback; \ |
66 | } |
67 | #else |
68 | #define U_BOOT_ENV_CALLBACK(name, callback) \ |
69 | ll_entry_declare(struct env_clbk_tbl, name, env_clbk) = \ |
70 | {#name, callback} |
71 | #endif |
72 | |
73 | #endif /* __ENV_CALLBACK_H__ */ |
74 |