1 #ifndef __LINUX_KCONFIG_H
2 #define __LINUX_KCONFIG_H
4 #include <generated/autoconf.h>
7 * Helper macros to use CONFIG_ options in C/CPP expressions. Note that
8 * these only work with boolean and tristate options.
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.
19 #define __ARG_PLACEHOLDER_1 0,
20 #define config_enabled(cfg, def_val) _config_enabled(cfg, def_val)
21 #define _config_enabled(value, def_val) __config_enabled(__ARG_PLACEHOLDER_##value, def_val)
22 #define __config_enabled(arg1_or_junk, def_val) ___config_enabled(arg1_or_junk 1, def_val)
23 #define ___config_enabled(__ignored, val, ...) val
26 * IS_ENABLED(CONFIG_FOO) evaluates to 1 if CONFIG_FOO is set to 'y',
29 #define IS_ENABLED(option) config_enabled(option, 0)
32 * U-Boot add-on: Helper macros to reference to different macros (prefixed by
33 * CONFIG_, CONFIG_SPL_, CONFIG_TPL_ or CONFIG_TOOLS_), depending on the build
38 #define _CONFIG_PREFIX TOOLS_
39 #elif defined(CONFIG_TPL_BUILD)
40 #define _CONFIG_PREFIX TPL_
41 #elif defined(CONFIG_VPL_BUILD)
42 #define _CONFIG_PREFIX VPL_
43 #elif defined(CONFIG_SPL_BUILD)
44 #define _CONFIG_PREFIX SPL_
46 #define _CONFIG_PREFIX
49 #define config_val(cfg) _config_val(_CONFIG_PREFIX, cfg)
50 #define _config_val(pfx, cfg) __config_val(pfx, cfg)
51 #define __config_val(pfx, cfg) CONFIG_ ## pfx ## cfg
54 * CONFIG_VAL(FOO) evaluates to the value of
55 * CONFIG_TOOLS_FOO if USE_HOSTCC is defined,
56 * CONFIG_FOO if CONFIG_SPL_BUILD is undefined,
57 * CONFIG_SPL_FOO if CONFIG_SPL_BUILD is defined.
58 * CONFIG_TPL_FOO if CONFIG_TPL_BUILD is defined.
59 * CONFIG_VPL_FOO if CONFIG_VPL_BUILD is defined.
61 #define CONFIG_VAL(option) config_val(option)
64 * This uses a similar mechanism to config_enabled() above. If cfg is enabled,
65 * it resolves to the value of opt_cfg, otherwise it resolves to def_val
67 #define config_opt_enabled(cfg, opt_cfg, def_val) _config_opt_enabled(cfg, opt_cfg, def_val)
68 #define _config_opt_enabled(cfg_val, opt_value, def_val) \
69 __config_opt_enabled(__ARG_PLACEHOLDER_##cfg_val, opt_value, def_val)
70 #define __config_opt_enabled(arg1_or_junk, arg2, def_val) \
71 ___config_opt_enabled(arg1_or_junk arg2, def_val)
72 #define ___config_opt_enabled(__ignored, val, ...) val
76 * Detect usage of a the value when the conditional is not enabled. When used
77 * in assembly context, this likely produces a assembly error, or hopefully at
78 * least something recognisable.
80 long invalid_use_of_IF_ENABLED_INT(void);
83 /* Evaluates to int_option if option is defined, otherwise a build error */
84 #define IF_ENABLED_INT(option, int_option) \
85 config_opt_enabled(option, int_option, invalid_use_of_IF_ENABLED_INT())
88 * Count number of arguments to a variadic macro. Currently only need
89 * it for 1, 2 or 3 arguments.
91 #define __arg6(a1, a2, a3, a4, a5, a6, ...) a6
92 #define __count_args(...) __arg6(dummy, ##__VA_ARGS__, 4, 3, 2, 1, 0)
94 #define __concat(a, b) ___concat(a, b)
95 #define ___concat(a, b) a ## b
97 #define __unwrap(...) __VA_ARGS__
98 #define __unwrap1(case1, case0) __unwrap case1
99 #define __unwrap0(case1, case0) __unwrap case0
101 #define __CONFIG_IS_ENABLED_1(option) __CONFIG_IS_ENABLED_3(option, (1), (0))
102 #define __CONFIG_IS_ENABLED_2(option, case1) __CONFIG_IS_ENABLED_3(option, case1, ())
103 #define __CONFIG_IS_ENABLED_3(option, case1, case0) \
104 __concat(__unwrap, config_enabled(CONFIG_VAL(option), 0)) (case1, case0)
107 * CONFIG_IS_ENABLED(FOO) expands to
108 * 1 if USE_HOSTCC is defined and CONFIG_TOOLS_FOO is set to 'y',
109 * 1 if CONFIG_SPL_BUILD is undefined and CONFIG_FOO is set to 'y',
110 * 1 if CONFIG_SPL_BUILD is defined and CONFIG_SPL_FOO is set to 'y',
111 * 1 if CONFIG_TPL_BUILD is defined and CONFIG_TPL_FOO is set to 'y',
114 * CONFIG_IS_ENABLED(FOO, (abc)) expands to
115 * abc if USE_HOSTCC is defined and CONFIG_TOOLS_FOO is set to 'y',
116 * abc if CONFIG_SPL_BUILD is undefined and CONFIG_FOO is set to 'y',
117 * abc if CONFIG_SPL_BUILD is defined and CONFIG_SPL_FOO is set to 'y',
118 * abc if CONFIG_TPL_BUILD is defined and CONFIG_TPL_FOO is set to 'y',
121 * CONFIG_IS_ENABLED(FOO, (abc), (def)) expands to
122 * abc if USE_HOSTCC is defined and CONFIG_TOOLS_FOO is set to 'y',
123 * abc if CONFIG_SPL_BUILD is undefined and CONFIG_FOO is set to 'y',
124 * abc if CONFIG_SPL_BUILD is defined and CONFIG_SPL_FOO is set to 'y',
125 * abc if CONFIG_TPL_BUILD is defined and CONFIG_TPL_FOO is set to 'y',
128 * The optional second and third arguments must be parenthesized; that
129 * allows one to include a trailing comma, e.g. for use in
131 * CONFIG_IS_ENABLED(ACME, ({.compatible = "acme,frobnozzle"},))
133 * which adds an entry to the array being defined if CONFIG_ACME (or
134 * CONFIG_SPL_ACME/CONFIG_TPL_ACME, depending on build context) is
135 * set, and nothing otherwise.
138 #define CONFIG_IS_ENABLED(option, ...) \
139 __concat(__CONFIG_IS_ENABLED_, __count_args(option, ##__VA_ARGS__)) (option, ##__VA_ARGS__)
143 * Detect usage of a the value when the conditional is not enabled. When used
144 * in assembly context, this likely produces a assembly error, or hopefully at
145 * least something recognisable.
147 long invalid_use_of_CONFIG_IF_ENABLED_INT(void);
151 * Evaluates to SPL_/TPL_int_option if SPL_/TPL_/option is not defined,
152 * otherwise build error
154 #define CONFIG_IF_ENABLED_INT(option, int_option) \
155 CONFIG_IS_ENABLED(option, (CONFIG_VAL(int_option)), \
156 (invalid_use_of_CONFIG_IF_ENABLED_INT()))
158 #endif /* __LINUX_KCONFIG_H */