The previous commit introduced a useful macro used in makefiles, which references to different variables (CONFIG_ or CONFIG_SPL_ prefixed), in order to enable/disable features independently for each of images.
Per-image config option control is a PITA in C sources, too. So, introduce some macros useful in C/CPP expressions.
CONFIG_IS_ENABLED(FOO) is a shorthand for
(!defined(CONFIG_SPL_BUILD) && defined(CONFIG_FOO)) || \ (defined(CONFIG_SPL_BUILD) && defined(CONFIG_SPL_FOO))
For example, it is useful to describe C code as follows,
#if CONFIG_IS_ENABLED(OF_CONTROL) (device tree code) #else (board file code) #endif
The ifdef conditional above is switched by CONFIG_OF_CONTROL during the U-Boot proper building (CONFIG_SPL_BUILD is not defined), and by CONFIG_SPL_OF_CONTROL during SPL building (CONFIG_SPL_BUILD is defined).
The macro can be used in C context as well, so you can also write the equivalent code as follows:
if (CONFIG_IS_ENABLED(OF_CONTROL)) { (device tree code) } else { (board file code) }
Another useful macro is CONFIG_VALUE(). CONFIG_VALUE(FOO) is expanded into CONFIG_FOO during the main build, and into CONFIG_SPL_FOO during SPL build.
You can write as follows:
text_base = CONFIG_VALUE(TEXT_BASE);
instead of:
#ifdef CONFIG_SPL_BUILD text_base = CONFIG_SPL_TEXT_BASE; #else text_base = CONFIG_TEXT_BASE; #endif
Signed-off-by: Masahiro Yamada yamada.masahiro@socionext.com ---
include/linux/kconfig.h | 48 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 48 insertions(+)
diff --git a/include/linux/kconfig.h b/include/linux/kconfig.h index be342b9..73679be 100644 --- a/include/linux/kconfig.h +++ b/include/linux/kconfig.h @@ -43,4 +43,52 @@ */ #define IS_MODULE(option) config_enabled(option##_MODULE)
+/* + * U-Boot add-on: Helper macros to reference to different macros + * (CONFIG_ or CONFIG_SPL_ prefixed), depending on the build context. + */ +#ifdef CONFIG_SPL_BUILD +#define _IS_SPL 1 +#endif + +#define config_val(cfg) _config_val(_IS_SPL, cfg) +#define _config_val(x, cfg) __config_val(x, cfg) +#define __config_val(x, cfg) ___config_val(__ARG_PLACEHOLDER_##x, cfg) +#define ___config_val(arg1_or_junk, cfg) \ + ____config_val(arg1_or_junk CONFIG_SPL_##cfg, CONFIG_##cfg) +#define ____config_val(__ignored, val, ...) val + +/* + * CONFIG_VAL(FOO) evaluates to the value of + * CONFIG_FOO if CONFIG_SPL_BUILD is undefined, + * CONFIG_SPL_FOO if CONFIG_SPL_BUILD is defined. + */ +#define CONFIG_VAL(option) config_val(option) + +/* + * CONFIG_IS_ENABLED(FOO) evaluates to + * 1 if CONFIG_SPL_BUILD is undefined and CONFIG_FOO is set to 'y' or 'm', + * 1 if CONFIG_SPL_BUILD is defined and CONFIG_SPL_FOO is set to 'y' or 'm', + * 0 otherwise. + */ +#define CONFIG_IS_ENABLED(option) \ + config_enabled(CONFIG_VAL(option)) || \ + config_enabled(CONFIG_VAL(option##_MODULE)) + +/* + * CONFIG_IS_BUILTIN(FOO) evaluates to + * 1 if CONFIG_SPL_BUILD is undefined and CONFIG_FOO is set to 'y', + * 1 if CONFIG_SPL_BUILD is defined and CONFIG_SPL_FOO is set to 'y', + * 0 otherwise. + */ +#define CONFIG_IS_BUILTIN(option) config_enabled(CONFIG_VAL(option)) + +/* + * CONFIG_IS_MODULE(FOO) evaluates to + * 1 if CONFIG_SPL_BUILD is undefined and CONFIG_FOO is set to 'm', + * 1 if CONFIG_SPL_BUILD is defined and CONFIG_SPL_FOO is set to 'm', + * 0 otherwise. + */ +#define CONFIG_IS_MODULE(option) config_enabled(CONFIG_VAL(option##_MODULE)) + #endif /* __LINUX_KCONFIG_H */