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', 27 * 0 otherwise. 28 * 29 */ 30 #define IS_ENABLED(option) \ 31 (config_enabled(option)) 32 33 /* 34 * U-Boot add-on: Helper macros to reference to different macros 35 * (CONFIG_ or CONFIG_SPL_ prefixed), depending on the build context. 36 */ 37 38 #if defined(CONFIG_TPL_BUILD) 39 #define _CONFIG_PREFIX TPL_ 40 #elif defined(CONFIG_SPL_BUILD) 41 #define _CONFIG_PREFIX SPL_ 42 #else 43 #define _CONFIG_PREFIX 44 #endif 45 46 #define config_val(cfg) _config_val(_CONFIG_PREFIX, cfg) 47 #define _config_val(pfx, cfg) __config_val(pfx, cfg) 48 #define __config_val(pfx, cfg) CONFIG_ ## pfx ## cfg 49 50 /* 51 * CONFIG_VAL(FOO) evaluates to the value of 52 * CONFIG_FOO if CONFIG_SPL_BUILD is undefined, 53 * CONFIG_SPL_FOO if CONFIG_SPL_BUILD is defined. 54 * CONFIG_TPL_FOO if CONFIG_TPL_BUILD is defined. 55 */ 56 #define CONFIG_VAL(option) config_val(option) 57 58 /* 59 * Count number of arguments to a variadic macro. Currently only need 60 * it for 1, 2 or 3 arguments. 61 */ 62 #define __arg6(a1, a2, a3, a4, a5, a6, ...) a6 63 #define __count_args(...) __arg6(dummy, ##__VA_ARGS__, 4, 3, 2, 1, 0) 64 65 #define __concat(a, b) ___concat(a, b) 66 #define ___concat(a, b) a ## b 67 68 #define __unwrap(...) __VA_ARGS__ 69 #define __unwrap1(case1, case0) __unwrap case1 70 #define __unwrap0(case1, case0) __unwrap case0 71 72 #define __CONFIG_IS_ENABLED_1(option) __CONFIG_IS_ENABLED_3(option, (1), (0)) 73 #define __CONFIG_IS_ENABLED_2(option, case1) __CONFIG_IS_ENABLED_3(option, case1, ()) 74 #define __CONFIG_IS_ENABLED_3(option, case1, case0) \ 75 __concat(__unwrap, config_enabled(CONFIG_VAL(option))) (case1, case0) 76 77 /* 78 * CONFIG_IS_ENABLED(FOO) expands to 79 * 1 if CONFIG_SPL_BUILD is undefined and CONFIG_FOO is set to 'y', 80 * 1 if CONFIG_SPL_BUILD is defined and CONFIG_SPL_FOO is set to 'y', 81 * 1 if CONFIG_TPL_BUILD is defined and CONFIG_TPL_FOO is set to 'y', 82 * 0 otherwise. 83 * 84 * CONFIG_IS_ENABLED(FOO, (abc)) expands to 85 * abc if CONFIG_SPL_BUILD is undefined and CONFIG_FOO is set to 'y', 86 * abc if CONFIG_SPL_BUILD is defined and CONFIG_SPL_FOO is set to 'y', 87 * abc if CONFIG_TPL_BUILD is defined and CONFIG_TPL_FOO is set to 'y', 88 * nothing otherwise. 89 * 90 * CONFIG_IS_ENABLED(FOO, (abc), (def)) expands to 91 * abc if CONFIG_SPL_BUILD is undefined and CONFIG_FOO is set to 'y', 92 * abc if CONFIG_SPL_BUILD is defined and CONFIG_SPL_FOO is set to 'y', 93 * abc if CONFIG_TPL_BUILD is defined and CONFIG_TPL_FOO is set to 'y', 94 * def otherwise. 95 * 96 * The optional second and third arguments must be parenthesized; that 97 * allows one to include a trailing comma, e.g. for use in 98 * 99 * CONFIG_IS_ENABLED(ACME, ({.compatible = "acme,frobnozzle"},)) 100 * 101 * which adds an entry to the array being defined if CONFIG_ACME (or 102 * CONFIG_SPL_ACME/CONFIG_TPL_ACME, depending on build context) is 103 * set, and nothing otherwise. 104 */ 105 106 #define CONFIG_IS_ENABLED(option, ...) \ 107 __concat(__CONFIG_IS_ENABLED_, __count_args(option, ##__VA_ARGS__)) (option, ##__VA_ARGS__) 108 109 110 #endif /* __LINUX_KCONFIG_H */ 111