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Masahiro Yamada0a9064f2014-07-30 14:08:13 +09001#ifndef __LINUX_KCONFIG_H
2#define __LINUX_KCONFIG_H
3
4#include <generated/autoconf.h>
5
6/*
7 * Helper macros to use CONFIG_ options in C/CPP expressions. Note that
8 * these only work with boolean and tristate options.
9 */
10
11/*
12 * Getting something that works in C and CPP for an arg that may or may
13 * not be defined is tricky. Here, if we have "#define CONFIG_BOOGER 1"
14 * we match on the placeholder define, insert the "0," for arg1 and generate
15 * the triplet (0, 1, 0). Then the last step cherry picks the 2nd arg (a one).
16 * When CONFIG_BOOGER is not defined, we generate a (... 1, 0) pair, and when
17 * the last step cherry picks the 2nd arg, we get a zero.
18 */
19#define __ARG_PLACEHOLDER_1 0,
20#define config_enabled(cfg) _config_enabled(cfg)
21#define _config_enabled(value) __config_enabled(__ARG_PLACEHOLDER_##value)
22#define __config_enabled(arg1_or_junk) ___config_enabled(arg1_or_junk 1, 0)
23#define ___config_enabled(__ignored, val, ...) val
24
25/*
26 * IS_ENABLED(CONFIG_FOO) evaluates to 1 if CONFIG_FOO is set to 'y' or 'm',
27 * 0 otherwise.
28 *
29 */
30#define IS_ENABLED(option) \
31 (config_enabled(option) || config_enabled(option##_MODULE))
32
33/*
34 * IS_BUILTIN(CONFIG_FOO) evaluates to 1 if CONFIG_FOO is set to 'y', 0
35 * otherwise. For boolean options, this is equivalent to
36 * IS_ENABLED(CONFIG_FOO).
37 */
38#define IS_BUILTIN(option) config_enabled(option)
39
40/*
41 * IS_MODULE(CONFIG_FOO) evaluates to 1 if CONFIG_FOO is set to 'm', 0
42 * otherwise.
43 */
44#define IS_MODULE(option) config_enabled(option##_MODULE)
45
Masahiro Yamada8be60f02015-08-12 07:31:43 +090046/*
47 * U-Boot add-on: Helper macros to reference to different macros
48 * (CONFIG_ or CONFIG_SPL_ prefixed), depending on the build context.
49 */
50#ifdef CONFIG_SPL_BUILD
51#define _IS_SPL 1
52#endif
53
54#define config_val(cfg) _config_val(_IS_SPL, cfg)
55#define _config_val(x, cfg) __config_val(x, cfg)
56#define __config_val(x, cfg) ___config_val(__ARG_PLACEHOLDER_##x, cfg)
57#define ___config_val(arg1_or_junk, cfg) \
58 ____config_val(arg1_or_junk CONFIG_SPL_##cfg, CONFIG_##cfg)
59#define ____config_val(__ignored, val, ...) val
60
61/*
62 * CONFIG_VAL(FOO) evaluates to the value of
63 * CONFIG_FOO if CONFIG_SPL_BUILD is undefined,
64 * CONFIG_SPL_FOO if CONFIG_SPL_BUILD is defined.
65 */
66#define CONFIG_VAL(option) config_val(option)
67
68/*
69 * CONFIG_IS_ENABLED(FOO) evaluates to
70 * 1 if CONFIG_SPL_BUILD is undefined and CONFIG_FOO is set to 'y' or 'm',
71 * 1 if CONFIG_SPL_BUILD is defined and CONFIG_SPL_FOO is set to 'y' or 'm',
72 * 0 otherwise.
73 */
74#define CONFIG_IS_ENABLED(option) \
75 (config_enabled(CONFIG_VAL(option)) || \
76 config_enabled(CONFIG_VAL(option##_MODULE)))
77
78/*
79 * CONFIG_IS_BUILTIN(FOO) evaluates to
80 * 1 if CONFIG_SPL_BUILD is undefined and CONFIG_FOO is set to 'y',
81 * 1 if CONFIG_SPL_BUILD is defined and CONFIG_SPL_FOO is set to 'y',
82 * 0 otherwise.
83 */
84#define CONFIG_IS_BUILTIN(option) config_enabled(CONFIG_VAL(option))
85
86/*
87 * CONFIG_IS_MODULE(FOO) evaluates to
88 * 1 if CONFIG_SPL_BUILD is undefined and CONFIG_FOO is set to 'm',
89 * 1 if CONFIG_SPL_BUILD is defined and CONFIG_SPL_FOO is set to 'm',
90 * 0 otherwise.
91 */
92#define CONFIG_IS_MODULE(option) config_enabled(CONFIG_VAL(option##_MODULE))
93
Masahiro Yamada0a9064f2014-07-30 14:08:13 +090094#endif /* __LINUX_KCONFIG_H */