1*93281c4aSBorislav Petkov /* SPDX-License-Identifier: GPL-2.0 */ 2*93281c4aSBorislav Petkov #ifndef _TOOLS_LINUX_KCONFIG_H 3*93281c4aSBorislav Petkov #define _TOOLS_LINUX_KCONFIG_H 4*93281c4aSBorislav Petkov 5*93281c4aSBorislav Petkov /* CONFIG_CC_VERSION_TEXT (Do not delete this comment. See help in Kconfig) */ 6*93281c4aSBorislav Petkov 7*93281c4aSBorislav Petkov #define __ARG_PLACEHOLDER_1 0, 8*93281c4aSBorislav Petkov #define __take_second_arg(__ignored, val, ...) val 9*93281c4aSBorislav Petkov 10*93281c4aSBorislav Petkov /* 11*93281c4aSBorislav Petkov * The use of "&&" / "||" is limited in certain expressions. 12*93281c4aSBorislav Petkov * The following enable to calculate "and" / "or" with macro expansion only. 13*93281c4aSBorislav Petkov */ 14*93281c4aSBorislav Petkov #define __and(x, y) ___and(x, y) 15*93281c4aSBorislav Petkov #define ___and(x, y) ____and(__ARG_PLACEHOLDER_##x, y) 16*93281c4aSBorislav Petkov #define ____and(arg1_or_junk, y) __take_second_arg(arg1_or_junk y, 0) 17*93281c4aSBorislav Petkov 18*93281c4aSBorislav Petkov #define __or(x, y) ___or(x, y) 19*93281c4aSBorislav Petkov #define ___or(x, y) ____or(__ARG_PLACEHOLDER_##x, y) 20*93281c4aSBorislav Petkov #define ____or(arg1_or_junk, y) __take_second_arg(arg1_or_junk 1, y) 21*93281c4aSBorislav Petkov 22*93281c4aSBorislav Petkov /* 23*93281c4aSBorislav Petkov * Helper macros to use CONFIG_ options in C/CPP expressions. Note that 24*93281c4aSBorislav Petkov * these only work with boolean and tristate options. 25*93281c4aSBorislav Petkov */ 26*93281c4aSBorislav Petkov 27*93281c4aSBorislav Petkov /* 28*93281c4aSBorislav Petkov * Getting something that works in C and CPP for an arg that may or may 29*93281c4aSBorislav Petkov * not be defined is tricky. Here, if we have "#define CONFIG_BOOGER 1" 30*93281c4aSBorislav Petkov * we match on the placeholder define, insert the "0," for arg1 and generate 31*93281c4aSBorislav Petkov * the triplet (0, 1, 0). Then the last step cherry picks the 2nd arg (a one). 32*93281c4aSBorislav Petkov * When CONFIG_BOOGER is not defined, we generate a (... 1, 0) pair, and when 33*93281c4aSBorislav Petkov * the last step cherry picks the 2nd arg, we get a zero. 34*93281c4aSBorislav Petkov */ 35*93281c4aSBorislav Petkov #define __is_defined(x) ___is_defined(x) 36*93281c4aSBorislav Petkov #define ___is_defined(val) ____is_defined(__ARG_PLACEHOLDER_##val) 37*93281c4aSBorislav Petkov #define ____is_defined(arg1_or_junk) __take_second_arg(arg1_or_junk 1, 0) 38*93281c4aSBorislav Petkov 39*93281c4aSBorislav Petkov /* 40*93281c4aSBorislav Petkov * IS_BUILTIN(CONFIG_FOO) evaluates to 1 if CONFIG_FOO is set to 'y', 0 41*93281c4aSBorislav Petkov * otherwise. For boolean options, this is equivalent to 42*93281c4aSBorislav Petkov * IS_ENABLED(CONFIG_FOO). 43*93281c4aSBorislav Petkov */ 44*93281c4aSBorislav Petkov #define IS_BUILTIN(option) __is_defined(option) 45*93281c4aSBorislav Petkov 46*93281c4aSBorislav Petkov /* 47*93281c4aSBorislav Petkov * IS_MODULE(CONFIG_FOO) evaluates to 1 if CONFIG_FOO is set to 'm', 0 48*93281c4aSBorislav Petkov * otherwise. 49*93281c4aSBorislav Petkov */ 50*93281c4aSBorislav Petkov #define IS_MODULE(option) __is_defined(option##_MODULE) 51*93281c4aSBorislav Petkov 52*93281c4aSBorislav Petkov /* 53*93281c4aSBorislav Petkov * IS_REACHABLE(CONFIG_FOO) evaluates to 1 if the currently compiled 54*93281c4aSBorislav Petkov * code can call a function defined in code compiled based on CONFIG_FOO. 55*93281c4aSBorislav Petkov * This is similar to IS_ENABLED(), but returns false when invoked from 56*93281c4aSBorislav Petkov * built-in code when CONFIG_FOO is set to 'm'. 57*93281c4aSBorislav Petkov */ 58*93281c4aSBorislav Petkov #define IS_REACHABLE(option) __or(IS_BUILTIN(option), \ 59*93281c4aSBorislav Petkov __and(IS_MODULE(option), __is_defined(MODULE))) 60*93281c4aSBorislav Petkov 61*93281c4aSBorislav Petkov /* 62*93281c4aSBorislav Petkov * IS_ENABLED(CONFIG_FOO) evaluates to 1 if CONFIG_FOO is set to 'y' or 'm', 63*93281c4aSBorislav Petkov * 0 otherwise. 64*93281c4aSBorislav Petkov */ 65*93281c4aSBorislav Petkov #define IS_ENABLED(option) __or(IS_BUILTIN(option), IS_MODULE(option)) 66*93281c4aSBorislav Petkov 67*93281c4aSBorislav Petkov #endif /* _TOOLS_LINUX_KCONFIG_H */ 68