1*0a9064fbSMasahiro Yamada #ifndef __LINUX_KCONFIG_H 2*0a9064fbSMasahiro Yamada #define __LINUX_KCONFIG_H 3*0a9064fbSMasahiro Yamada 4*0a9064fbSMasahiro Yamada #include <generated/autoconf.h> 5*0a9064fbSMasahiro Yamada 6*0a9064fbSMasahiro Yamada /* 7*0a9064fbSMasahiro Yamada * Helper macros to use CONFIG_ options in C/CPP expressions. Note that 8*0a9064fbSMasahiro Yamada * these only work with boolean and tristate options. 9*0a9064fbSMasahiro Yamada */ 10*0a9064fbSMasahiro Yamada 11*0a9064fbSMasahiro Yamada /* 12*0a9064fbSMasahiro Yamada * Getting something that works in C and CPP for an arg that may or may 13*0a9064fbSMasahiro Yamada * not be defined is tricky. Here, if we have "#define CONFIG_BOOGER 1" 14*0a9064fbSMasahiro Yamada * we match on the placeholder define, insert the "0," for arg1 and generate 15*0a9064fbSMasahiro Yamada * the triplet (0, 1, 0). Then the last step cherry picks the 2nd arg (a one). 16*0a9064fbSMasahiro Yamada * When CONFIG_BOOGER is not defined, we generate a (... 1, 0) pair, and when 17*0a9064fbSMasahiro Yamada * the last step cherry picks the 2nd arg, we get a zero. 18*0a9064fbSMasahiro Yamada */ 19*0a9064fbSMasahiro Yamada #define __ARG_PLACEHOLDER_1 0, 20*0a9064fbSMasahiro Yamada #define config_enabled(cfg) _config_enabled(cfg) 21*0a9064fbSMasahiro Yamada #define _config_enabled(value) __config_enabled(__ARG_PLACEHOLDER_##value) 22*0a9064fbSMasahiro Yamada #define __config_enabled(arg1_or_junk) ___config_enabled(arg1_or_junk 1, 0) 23*0a9064fbSMasahiro Yamada #define ___config_enabled(__ignored, val, ...) val 24*0a9064fbSMasahiro Yamada 25*0a9064fbSMasahiro Yamada /* 26*0a9064fbSMasahiro Yamada * IS_ENABLED(CONFIG_FOO) evaluates to 1 if CONFIG_FOO is set to 'y' or 'm', 27*0a9064fbSMasahiro Yamada * 0 otherwise. 28*0a9064fbSMasahiro Yamada * 29*0a9064fbSMasahiro Yamada */ 30*0a9064fbSMasahiro Yamada #define IS_ENABLED(option) \ 31*0a9064fbSMasahiro Yamada (config_enabled(option) || config_enabled(option##_MODULE)) 32*0a9064fbSMasahiro Yamada 33*0a9064fbSMasahiro Yamada /* 34*0a9064fbSMasahiro Yamada * IS_BUILTIN(CONFIG_FOO) evaluates to 1 if CONFIG_FOO is set to 'y', 0 35*0a9064fbSMasahiro Yamada * otherwise. For boolean options, this is equivalent to 36*0a9064fbSMasahiro Yamada * IS_ENABLED(CONFIG_FOO). 37*0a9064fbSMasahiro Yamada */ 38*0a9064fbSMasahiro Yamada #define IS_BUILTIN(option) config_enabled(option) 39*0a9064fbSMasahiro Yamada 40*0a9064fbSMasahiro Yamada /* 41*0a9064fbSMasahiro Yamada * IS_MODULE(CONFIG_FOO) evaluates to 1 if CONFIG_FOO is set to 'm', 0 42*0a9064fbSMasahiro Yamada * otherwise. 43*0a9064fbSMasahiro Yamada */ 44*0a9064fbSMasahiro Yamada #define IS_MODULE(option) config_enabled(option##_MODULE) 45*0a9064fbSMasahiro Yamada 46*0a9064fbSMasahiro Yamada #endif /* __LINUX_KCONFIG_H */ 47