LXR uboot/include/linux/kconfig.h

   1#ifndef __LINUX_KCONFIG_H
   2#define __LINUX_KCONFIG_H
   3
   4#include <generated/autoconf.h>
   5
   6/*
   7 * Helper macros to use CONFIG_ options in C/CPP expressions. Note that
   8 * these only work with boolean and tristate options.
   9 */
  10
  11/*
  12 * Getting something that works in C and CPP for an arg that may or may
  13 * not be defined is tricky.  Here, if we have "#define CONFIG_BOOGER 1"
  14 * we match on the placeholder define, insert the "0," for arg1 and generate
  15 * the triplet (0, 1, 0).  Then the last step cherry picks the 2nd arg (a one).
  16 * When CONFIG_BOOGER is not defined, we generate a (... 1, 0) pair, and when
  17 * the last step cherry picks the 2nd arg, we get a zero.
  18 */
  19#define __ARG_PLACEHOLDER_1 0,
  20#define config_enabled(cfg) _config_enabled(cfg)
  21#define _config_enabled(value) __config_enabled(__ARG_PLACEHOLDER_##value)
  22#define __config_enabled(arg1_or_junk) ___config_enabled(arg1_or_junk 1, 0)
  23#define ___config_enabled(__ignored, val, ...) val
  24
  25/*
  26 * IS_ENABLED(CONFIG_FOO) evaluates to 1 if CONFIG_FOO is set to 'y' or 'm',
  27 * 0 otherwise.
  28 *
  29 */
  30#define IS_ENABLED(option) \
  31        (config_enabled(option) || config_enabled(option##_MODULE))
  32
  33/*
  34 * IS_BUILTIN(CONFIG_FOO) evaluates to 1 if CONFIG_FOO is set to 'y', 0
  35 * otherwise. For boolean options, this is equivalent to
  36 * IS_ENABLED(CONFIG_FOO).
  37 */
  38#define IS_BUILTIN(option) config_enabled(option)
  39
  40/*
  41 * IS_MODULE(CONFIG_FOO) evaluates to 1 if CONFIG_FOO is set to 'm', 0
  42 * otherwise.
  43 */
  44#define IS_MODULE(option) config_enabled(option##_MODULE)
  45
  46/*
  47 * U-Boot add-on: Helper macros to reference to different macros
  48 * (CONFIG_ or CONFIG_SPL_ prefixed), depending on the build context.
  49 */
  50#ifdef CONFIG_SPL_BUILD
  51#define _IS_SPL 1
  52#endif
  53
  54#define config_val(cfg) _config_val(_IS_SPL, cfg)
  55#define _config_val(x, cfg) __config_val(x, cfg)
  56#define __config_val(x, cfg) ___config_val(__ARG_PLACEHOLDER_##x, cfg)
  57#define ___config_val(arg1_or_junk, cfg)  \
  58        ____config_val(arg1_or_junk CONFIG_SPL_##cfg, CONFIG_##cfg)
  59#define ____config_val(__ignored, val, ...) val
  60
  61/*
  62 * CONFIG_VAL(FOO) evaluates to the value of
  63 *  CONFIG_FOO if CONFIG_SPL_BUILD is undefined,
  64 *  CONFIG_SPL_FOO if CONFIG_SPL_BUILD is defined.
  65 */
  66#define CONFIG_VAL(option)  config_val(option)
  67
  68/*
  69 * CONFIG_IS_ENABLED(FOO) evaluates to
  70 *  1 if CONFIG_SPL_BUILD is undefined and CONFIG_FOO is set to 'y' or 'm',
  71 *  1 if CONFIG_SPL_BUILD is defined and CONFIG_SPL_FOO is set to 'y' or 'm',
  72 *  0 otherwise.
  73 */
  74#define CONFIG_IS_ENABLED(option) \
  75        (config_enabled(CONFIG_VAL(option)) ||          \
  76         config_enabled(CONFIG_VAL(option##_MODULE)))
  77
  78/*
  79 * CONFIG_IS_BUILTIN(FOO) evaluates to
  80 *  1 if CONFIG_SPL_BUILD is undefined and CONFIG_FOO is set to 'y',
  81 *  1 if CONFIG_SPL_BUILD is defined and CONFIG_SPL_FOO is set to 'y',
  82 *  0 otherwise.
  83 */
  84#define CONFIG_IS_BUILTIN(option) config_enabled(CONFIG_VAL(option))
  85
  86/*
  87 * CONFIG_IS_MODULE(FOO) evaluates to
  88 *  1 if CONFIG_SPL_BUILD is undefined and CONFIG_FOO is set to 'm',
  89 *  1 if CONFIG_SPL_BUILD is defined and CONFIG_SPL_FOO is set to 'm',
  90 *  0 otherwise.
  91 */
  92#define CONFIG_IS_MODULE(option) config_enabled(CONFIG_VAL(option##_MODULE))
  93
  94#endif /* __LINUX_KCONFIG_H */
  95