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79 lines
2.6 KiB
79 lines
2.6 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef __LINUX_KCONFIG_H |
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#define __LINUX_KCONFIG_H |
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#include <generated/autoconf.h> |
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#ifdef CONFIG_CPU_BIG_ENDIAN |
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#define __BIG_ENDIAN 4321 |
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#else |
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#define __LITTLE_ENDIAN 1234 |
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#endif |
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#define __ARG_PLACEHOLDER_1 0, |
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#define __take_second_arg(__ignored, val, ...) val |
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/* |
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* The use of "&&" / "||" is limited in certain expressions. |
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* The following enable to calculate "and" / "or" with macro expansion only. |
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*/ |
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#define __and(x, y) ___and(x, y) |
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#define ___and(x, y) ____and(__ARG_PLACEHOLDER_##x, y) |
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#define ____and(arg1_or_junk, y) __take_second_arg(arg1_or_junk y, 0) |
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#define __or(x, y) ___or(x, y) |
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#define ___or(x, y) ____or(__ARG_PLACEHOLDER_##x, y) |
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#define ____or(arg1_or_junk, y) __take_second_arg(arg1_or_junk 1, y) |
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/* |
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* Helper macros to use CONFIG_ options in C/CPP expressions. Note that |
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* these only work with boolean and tristate options. |
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*/ |
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/* |
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* Getting something that works in C and CPP for an arg that may or may |
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* not be defined is tricky. Here, if we have "#define CONFIG_BOOGER 1" |
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* we match on the placeholder define, insert the "0," for arg1 and generate |
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* the triplet (0, 1, 0). Then the last step cherry picks the 2nd arg (a one). |
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* When CONFIG_BOOGER is not defined, we generate a (... 1, 0) pair, and when |
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* the last step cherry picks the 2nd arg, we get a zero. |
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*/ |
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#define __is_defined(x) ___is_defined(x) |
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#define ___is_defined(val) ____is_defined(__ARG_PLACEHOLDER_##val) |
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#define ____is_defined(arg1_or_junk) __take_second_arg(arg1_or_junk 1, 0) |
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/* |
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* IS_BUILTIN(CONFIG_FOO) evaluates to 1 if CONFIG_FOO is set to 'y', 0 |
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* otherwise. For boolean options, this is equivalent to |
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* IS_ENABLED(CONFIG_FOO). |
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*/ |
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#define IS_BUILTIN(option) __is_defined(option) |
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/* |
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* IS_MODULE(CONFIG_FOO) evaluates to 1 if CONFIG_FOO is set to 'm', 0 |
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* otherwise. |
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*/ |
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#define IS_MODULE(option) __is_defined(option##_MODULE) |
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/* |
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* IS_REACHABLE(CONFIG_FOO) evaluates to 1 if the currently compiled |
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* code can call a function defined in code compiled based on CONFIG_FOO. |
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* This is similar to IS_ENABLED(), but returns false when invoked from |
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* built-in code when CONFIG_FOO is set to 'm'. |
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*/ |
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#define IS_REACHABLE(option) __or(IS_BUILTIN(option), \ |
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__and(IS_MODULE(option), __is_defined(MODULE))) |
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/* |
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* IS_ENABLED(CONFIG_FOO) evaluates to 1 if CONFIG_FOO is set to 'y' or 'm', |
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* 0 otherwise. |
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*/ |
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#define IS_ENABLED(option) __or(IS_BUILTIN(option), IS_MODULE(option)) |
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/* |
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* IF_ENABLED(CONFIG_FOO, ptr) evaluates to (ptr) if CONFIG_FOO is set to 'y' |
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* or 'm', NULL otherwise. |
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*/ |
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#define IF_ENABLED(option, ptr) (IS_ENABLED(option) ? (ptr) : NULL) |
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#endif /* __LINUX_KCONFIG_H */
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