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