1 #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 46 /* 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 94 #endif /* __LINUX_KCONFIG_H */ 95