#ifndef __LINUX_KCONFIG_H #define __LINUX_KCONFIG_H #include /* * 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, def_val) _config_enabled(cfg, def_val) #define _config_enabled(value, def_val) __config_enabled(__ARG_PLACEHOLDER_##value, def_val) #define __config_enabled(arg1_or_junk, def_val) ___config_enabled(arg1_or_junk 1, def_val) #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, 0) /* * U-Boot add-on: Helper macros to reference to different macros (prefixed by * CONFIG_, CONFIG_SPL_, CONFIG_TPL_ or CONFIG_TOOLS_), depending on the build * context. */ #ifdef USE_HOSTCC #define _CONFIG_PREFIX TOOLS_ #elif defined(CONFIG_TPL_BUILD) #define _CONFIG_PREFIX TPL_ #elif defined(CONFIG_VPL_BUILD) #define _CONFIG_PREFIX VPL_ #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_TOOLS_FOO if USE_HOSTCC is defined, * 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. * CONFIG_VPL_FOO if CONFIG_VPL_BUILD is defined. */ #define CONFIG_VAL(option) config_val(option) /* * This uses a similar mechanism to config_enabled() above. If cfg is enabled, * it resolves to the value of opt_cfg, otherwise it resolves to def_val */ #define config_opt_enabled(cfg, opt_cfg, def_val) _config_opt_enabled(cfg, opt_cfg, def_val) #define _config_opt_enabled(cfg_val, opt_value, def_val) \ __config_opt_enabled(__ARG_PLACEHOLDER_##cfg_val, opt_value, def_val) #define __config_opt_enabled(arg1_or_junk, arg2, def_val) \ ___config_opt_enabled(arg1_or_junk arg2, def_val) #define ___config_opt_enabled(__ignored, val, ...) val #ifndef __ASSEMBLY__ /* * Detect usage of a the value when the conditional is not enabled. When used * in assembly context, this likely produces a assembly error, or hopefully at * least something recognisable. */ long invalid_use_of_IF_ENABLED_INT(void); #endif /* Evaluates to int_option if option is defined, otherwise a build error */ #define IF_ENABLED_INT(option, int_option) \ config_opt_enabled(option, int_option, invalid_use_of_IF_ENABLED_INT()) /* * 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), 0)) (case1, case0) /* * CONFIG_IS_ENABLED(FOO) expands to * 1 if USE_HOSTCC is defined and CONFIG_TOOLS_FOO is set to 'y', * 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 USE_HOSTCC is defined and CONFIG_TOOLS_FOO is set to 'y', * 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 USE_HOSTCC is defined and CONFIG_TOOLS_FOO is set to 'y', * 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__) #ifndef __ASSEMBLY__ /* * Detect usage of a the value when the conditional is not enabled. When used * in assembly context, this likely produces a assembly error, or hopefully at * least something recognisable. */ long invalid_use_of_CONFIG_IF_ENABLED_INT(void); #endif /* * Evaluates to SPL_/TPL_int_option if SPL_/TPL_/option is not defined, * otherwise build error */ #define CONFIG_IF_ENABLED_INT(option, int_option) \ CONFIG_IS_ENABLED(option, (CONFIG_VAL(int_option)), \ (invalid_use_of_CONFIG_IF_ENABLED_INT())) #endif /* __LINUX_KCONFIG_H */