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- #ifndef __LINUX_KCONFIG_H
- #define __LINUX_KCONFIG_H
- #include <generated/autoconf.h>
- /*
- * Helper macros to use CONFIG_ options in C/CPP expressions. Note that
- * these only work with boolean and tristate options.
- */
- /*
- * Getting something that works in C and CPP for an arg that may or may
- * not be defined is tricky. Here, if we have "#define CONFIG_BOOGER 1"
- * we match on the placeholder define, insert the "0," for arg1 and generate
- * the triplet (0, 1, 0). Then the last step cherry picks the 2nd arg (a one).
- * When CONFIG_BOOGER is not defined, we generate a (... 1, 0) pair, and when
- * the last step cherry picks the 2nd arg, we get a zero.
- */
- #define __ARG_PLACEHOLDER_1 0,
- #define config_enabled(cfg) _config_enabled(cfg)
- #define _config_enabled(value) __config_enabled(__ARG_PLACEHOLDER_##value)
- #define __config_enabled(arg1_or_junk) ___config_enabled(arg1_or_junk 1, 0)
- #define ___config_enabled(__ignored, val, ...) val
- /*
- * IS_ENABLED(CONFIG_FOO) evaluates to 1 if CONFIG_FOO is set to 'y',
- * 0 otherwise.
- *
- */
- #define IS_ENABLED(option) \
- (config_enabled(option))
- /*
- * U-Boot add-on: Helper macros to reference to different macros
- * (CONFIG_ or CONFIG_SPL_ prefixed), depending on the build context.
- */
- #if defined(CONFIG_TPL_BUILD)
- #define _CONFIG_PREFIX TPL_
- #elif defined(CONFIG_SPL_BUILD)
- #define _CONFIG_PREFIX SPL_
- #else
- #define _CONFIG_PREFIX
- #endif
- #define config_val(cfg) _config_val(_CONFIG_PREFIX, cfg)
- #define _config_val(pfx, cfg) __config_val(pfx, cfg)
- #define __config_val(pfx, cfg) CONFIG_ ## pfx ## cfg
- /*
- * CONFIG_VAL(FOO) evaluates to the value of
- * CONFIG_FOO if CONFIG_SPL_BUILD is undefined,
- * CONFIG_SPL_FOO if CONFIG_SPL_BUILD is defined.
- * CONFIG_TPL_FOO if CONFIG_TPL_BUILD is defined.
- */
- #define CONFIG_VAL(option) config_val(option)
- /*
- * Count number of arguments to a variadic macro. Currently only need
- * it for 1, 2 or 3 arguments.
- */
- #define __arg6(a1, a2, a3, a4, a5, a6, ...) a6
- #define __count_args(...) __arg6(dummy, ##__VA_ARGS__, 4, 3, 2, 1, 0)
- #define __concat(a, b) ___concat(a, b)
- #define ___concat(a, b) a ## b
- #define __unwrap(...) __VA_ARGS__
- #define __unwrap1(case1, case0) __unwrap case1
- #define __unwrap0(case1, case0) __unwrap case0
- #define __CONFIG_IS_ENABLED_1(option) __CONFIG_IS_ENABLED_3(option, (1), (0))
- #define __CONFIG_IS_ENABLED_2(option, case1) __CONFIG_IS_ENABLED_3(option, case1, ())
- #define __CONFIG_IS_ENABLED_3(option, case1, case0) \
- __concat(__unwrap, config_enabled(CONFIG_VAL(option))) (case1, case0)
- /*
- * CONFIG_IS_ENABLED(FOO) expands to
- * 1 if CONFIG_SPL_BUILD is undefined and CONFIG_FOO is set to 'y',
- * 1 if CONFIG_SPL_BUILD is defined and CONFIG_SPL_FOO is set to 'y',
- * 1 if CONFIG_TPL_BUILD is defined and CONFIG_TPL_FOO is set to 'y',
- * 0 otherwise.
- *
- * CONFIG_IS_ENABLED(FOO, (abc)) expands to
- * abc if CONFIG_SPL_BUILD is undefined and CONFIG_FOO is set to 'y',
- * abc if CONFIG_SPL_BUILD is defined and CONFIG_SPL_FOO is set to 'y',
- * abc if CONFIG_TPL_BUILD is defined and CONFIG_TPL_FOO is set to 'y',
- * nothing otherwise.
- *
- * CONFIG_IS_ENABLED(FOO, (abc), (def)) expands to
- * abc if CONFIG_SPL_BUILD is undefined and CONFIG_FOO is set to 'y',
- * abc if CONFIG_SPL_BUILD is defined and CONFIG_SPL_FOO is set to 'y',
- * abc if CONFIG_TPL_BUILD is defined and CONFIG_TPL_FOO is set to 'y',
- * def otherwise.
- *
- * The optional second and third arguments must be parenthesized; that
- * allows one to include a trailing comma, e.g. for use in
- *
- * CONFIG_IS_ENABLED(ACME, ({.compatible = "acme,frobnozzle"},))
- *
- * which adds an entry to the array being defined if CONFIG_ACME (or
- * CONFIG_SPL_ACME/CONFIG_TPL_ACME, depending on build context) is
- * set, and nothing otherwise.
- */
- #define CONFIG_IS_ENABLED(option, ...) \
- __concat(__CONFIG_IS_ENABLED_, __count_args(option, ##__VA_ARGS__)) (option, ##__VA_ARGS__)
- #endif /* __LINUX_KCONFIG_H */
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