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 ---
include/linux/kconfig.h | 48 ++++++++++++++++++++++++++++++++++++++++++++++++ scripts/basic/fixdep.c | 26 ++++++++++++++++++++++++++ 2 files changed, 74 insertions(+)
diff --git a/include/linux/kconfig.h b/include/linux/kconfig.h index be342b9..486fb94 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 */ diff --git a/scripts/basic/fixdep.c b/scripts/basic/fixdep.c index 46cc1b3..20fed03 100644 --- a/scripts/basic/fixdep.c +++ b/scripts/basic/fixdep.c @@ -123,6 +123,7 @@ char *target; char *depfile; char *cmdline; +int is_spl_build = 0; /* hack for U-boot */
static void usage(void) { @@ -239,6 +240,7 @@ static void parse_config_file(const char *map, size_t len) /* start at +1, so that p can never be < map */ const int *m = (const int *) map + 1; const char *p, *q; + char tmp_buf[256] = "SPL_"; /* hack for U-Boot */
for (; m < end; m++) { if (*m == INT_CONF) { p = (char *) m ; goto conf; } @@ -263,6 +265,26 @@ static void parse_config_file(const char *map, size_t len) q -= 7; if (q - p < 0) continue; + + /* U-Boot also handles CONFIG_IS_{ENABLED/BUILTIN/MODULE} */ + if ((q - p == 10 && !memcmp(p, "IS_ENABLED(", 11)) || + (q - p == 10 && !memcmp(p, "IS_BUILTIN(", 11)) || + (q - p == 9 && !memcmp(p, "IS_MODULE(", 10))) { + p = q + 1; + for (q = p; q < map + len; q++) + if (*q == ')') + goto found2; + continue; + + found2: + if (is_spl_build) { + memcpy(tmp_buf + 4, p, q - p); + q = tmp_buf + 4 + (q - p); + p = tmp_buf; + } + } + /* end U-Boot hack */ + use_config(p, q - p); } } @@ -456,6 +478,10 @@ int main(int argc, char *argv[]) target = argv[2]; cmdline = argv[3];
+ /* hack for U-boot */ + if (!strncmp(target, "spl/", 4) || !strncmp(target, "tpl/", 4)) + is_spl_build = 1; + print_cmdline(); print_deps();