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 (prefixed by 35 * CONFIG_, CONFIG_SPL_, CONFIG_TPL_ or CONFIG_TOOLS_), depending on the build 36 * context. 37 */ 38 39 #ifdef USE_HOSTCC 40 #define _CONFIG_PREFIX TOOLS_ 41 #elif defined(CONFIG_TPL_BUILD) 42 #define _CONFIG_PREFIX TPL_ 43 #elif defined(CONFIG_SPL_BUILD) 44 #define _CONFIG_PREFIX SPL_ 45 #else 46 #define _CONFIG_PREFIX 47 #endif 48 49 #define config_val(cfg) _config_val(_CONFIG_PREFIX, cfg) 50 #define _config_val(pfx, cfg) __config_val(pfx, cfg) 51 #define __config_val(pfx, cfg) CONFIG_ ## pfx ## cfg 52 53 /* 54 * CONFIG_VAL(FOO) evaluates to the value of 55 * CONFIG_TOOLS_FOO if USE_HOSTCC is defined, 56 * CONFIG_FOO if CONFIG_SPL_BUILD is undefined, 57 * CONFIG_SPL_FOO if CONFIG_SPL_BUILD is defined. 58 * CONFIG_TPL_FOO if CONFIG_TPL_BUILD is defined. 59 */ 60 #define CONFIG_VAL(option) config_val(option) 61 62 /* 63 * Count number of arguments to a variadic macro. Currently only need 64 * it for 1, 2 or 3 arguments. 65 */ 66 #define __arg6(a1, a2, a3, a4, a5, a6, ...) a6 67 #define __count_args(...) __arg6(dummy, ##__VA_ARGS__, 4, 3, 2, 1, 0) 68 69 #define __concat(a, b) ___concat(a, b) 70 #define ___concat(a, b) a ## b 71 72 #define __unwrap(...) __VA_ARGS__ 73 #define __unwrap1(case1, case0) __unwrap case1 74 #define __unwrap0(case1, case0) __unwrap case0 75 76 #define __CONFIG_IS_ENABLED_1(option) __CONFIG_IS_ENABLED_3(option, (1), (0)) 77 #define __CONFIG_IS_ENABLED_2(option, case1) __CONFIG_IS_ENABLED_3(option, case1, ()) 78 #define __CONFIG_IS_ENABLED_3(option, case1, case0) \ 79 __concat(__unwrap, config_enabled(CONFIG_VAL(option))) (case1, case0) 80 81 /* 82 * CONFIG_IS_ENABLED(FOO) expands to 83 * 1 if USE_HOSTCC is defined and CONFIG_TOOLS_FOO is set to 'y', 84 * 1 if CONFIG_SPL_BUILD is undefined and CONFIG_FOO is set to 'y', 85 * 1 if CONFIG_SPL_BUILD is defined and CONFIG_SPL_FOO is set to 'y', 86 * 1 if CONFIG_TPL_BUILD is defined and CONFIG_TPL_FOO is set to 'y', 87 * 0 otherwise. 88 * 89 * CONFIG_IS_ENABLED(FOO, (abc)) expands to 90 * abc if USE_HOSTCC is defined and CONFIG_TOOLS_FOO is set to 'y', 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 * nothing otherwise. 95 * 96 * CONFIG_IS_ENABLED(FOO, (abc), (def)) expands to 97 * abc if USE_HOSTCC is defined and CONFIG_TOOLS_FOO is set to 'y', 98 * abc if CONFIG_SPL_BUILD is undefined and CONFIG_FOO is set to 'y', 99 * abc if CONFIG_SPL_BUILD is defined and CONFIG_SPL_FOO is set to 'y', 100 * abc if CONFIG_TPL_BUILD is defined and CONFIG_TPL_FOO is set to 'y', 101 * def otherwise. 102 * 103 * The optional second and third arguments must be parenthesized; that 104 * allows one to include a trailing comma, e.g. for use in 105 * 106 * CONFIG_IS_ENABLED(ACME, ({.compatible = "acme,frobnozzle"},)) 107 * 108 * which adds an entry to the array being defined if CONFIG_ACME (or 109 * CONFIG_SPL_ACME/CONFIG_TPL_ACME, depending on build context) is 110 * set, and nothing otherwise. 111 */ 112 113 #define CONFIG_IS_ENABLED(option, ...) \ 114 __concat(__CONFIG_IS_ENABLED_, __count_args(option, ##__VA_ARGS__)) (option, ##__VA_ARGS__) 115 116 117 #endif /* __LINUX_KCONFIG_H */ 118