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8be60f06c2
The previous commit introduced a useful macro used in makefiles,
in order to reference to different variables (CONFIG_... or
CONFIG_SPL_...) depending on the build context.
Per-image config option control is a PITA in C sources, too.
Here are some macros useful in C/CPP expressions.
CONFIG_IS_ENABLED(FOO) can be used as 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 if CONFIG_SPL_BUILD is
undefined, and into CONFIG_SPL_FOO if CONFIG_SPL_BUILD is defined.
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
This commit also adds slight hacking on fixdep so that it can
output a correct list of fixed dependencies.
If the fixdep finds CONFIG_IS_ENABLED(FOO) in a source file,
we want
$(wildcard include/config/foo.h)
in the U-boot proper building context, while we want
$(wildcard include/config/spl/foo.h)
in the SPL build context.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
95 lines
3.1 KiB
C
95 lines
3.1 KiB
C
#ifndef __LINUX_KCONFIG_H
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#define __LINUX_KCONFIG_H
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#include <generated/autoconf.h>
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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 __ARG_PLACEHOLDER_1 0,
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#define config_enabled(cfg) _config_enabled(cfg)
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#define _config_enabled(value) __config_enabled(__ARG_PLACEHOLDER_##value)
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#define __config_enabled(arg1_or_junk) ___config_enabled(arg1_or_junk 1, 0)
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#define ___config_enabled(__ignored, val, ...) val
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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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*/
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#define IS_ENABLED(option) \
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(config_enabled(option) || config_enabled(option##_MODULE))
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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) config_enabled(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) config_enabled(option##_MODULE)
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/*
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* U-Boot add-on: Helper macros to reference to different macros
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* (CONFIG_ or CONFIG_SPL_ prefixed), depending on the build context.
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*/
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#ifdef CONFIG_SPL_BUILD
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#define _IS_SPL 1
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#endif
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#define config_val(cfg) _config_val(_IS_SPL, cfg)
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#define _config_val(x, cfg) __config_val(x, cfg)
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#define __config_val(x, cfg) ___config_val(__ARG_PLACEHOLDER_##x, cfg)
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#define ___config_val(arg1_or_junk, cfg) \
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____config_val(arg1_or_junk CONFIG_SPL_##cfg, CONFIG_##cfg)
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#define ____config_val(__ignored, val, ...) val
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/*
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* CONFIG_VAL(FOO) evaluates to the value of
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* CONFIG_FOO if CONFIG_SPL_BUILD is undefined,
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* CONFIG_SPL_FOO if CONFIG_SPL_BUILD is defined.
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*/
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#define CONFIG_VAL(option) config_val(option)
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/*
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* CONFIG_IS_ENABLED(FOO) evaluates to
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* 1 if CONFIG_SPL_BUILD is undefined and CONFIG_FOO is set to 'y' or 'm',
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* 1 if CONFIG_SPL_BUILD is defined and CONFIG_SPL_FOO is set to 'y' or 'm',
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* 0 otherwise.
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*/
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#define CONFIG_IS_ENABLED(option) \
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(config_enabled(CONFIG_VAL(option)) || \
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config_enabled(CONFIG_VAL(option##_MODULE)))
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/*
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* CONFIG_IS_BUILTIN(FOO) evaluates to
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* 1 if CONFIG_SPL_BUILD is undefined and CONFIG_FOO is set to 'y',
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* 1 if CONFIG_SPL_BUILD is defined and CONFIG_SPL_FOO is set to 'y',
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* 0 otherwise.
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*/
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#define CONFIG_IS_BUILTIN(option) config_enabled(CONFIG_VAL(option))
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/*
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* CONFIG_IS_MODULE(FOO) evaluates to
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* 1 if CONFIG_SPL_BUILD is undefined and CONFIG_FOO is set to 'm',
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* 1 if CONFIG_SPL_BUILD is defined and CONFIG_SPL_FOO is set to 'm',
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* 0 otherwise.
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*/
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#define CONFIG_IS_MODULE(option) config_enabled(CONFIG_VAL(option##_MODULE))
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#endif /* __LINUX_KCONFIG_H */
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