#ifndef __LINUX_KCONFIG_H
  #define __LINUX_KCONFIG_H
  
  #include <generated/autoconf.h>
  
  /*
   * Helper macros to use CONFIG_ options in C/CPP expressions. Note that
   * these only work with boolean and tristate options.
   */
  
  /*
   * Getting something that works in C and CPP for an arg that may or may
   * not be defined is tricky.  Here, if we have "#define CONFIG_BOOGER 1"
   * we match on the placeholder define, insert the "0," for arg1 and generate
   * the triplet (0, 1, 0).  Then the last step cherry picks the 2nd arg (a one).
   * When CONFIG_BOOGER is not defined, we generate a (... 1, 0) pair, and when
   * the last step cherry picks the 2nd arg, we get a zero.
   */
  #define __ARG_PLACEHOLDER_1 0,
  #define config_enabled(cfg) _config_enabled(cfg)
  #define _config_enabled(value) __config_enabled(__ARG_PLACEHOLDER_##value)
  #define __config_enabled(arg1_or_junk) ___config_enabled(arg1_or_junk 1, 0)
  #define ___config_enabled(__ignored, val, ...) val
  
  /*
   * IS_ENABLED(CONFIG_FOO) evaluates to 1 if CONFIG_FOO is set to 'y' or 'm',
   * 0 otherwise.
   *
   */
  #define IS_ENABLED(option) \
  	(config_enabled(option) || config_enabled(option##_MODULE))
  
  /*
   * IS_BUILTIN(CONFIG_FOO) evaluates to 1 if CONFIG_FOO is set to 'y', 0
   * otherwise. For boolean options, this is equivalent to
   * IS_ENABLED(CONFIG_FOO).
   */
  #define IS_BUILTIN(option) config_enabled(option)
  
  /*
   * IS_MODULE(CONFIG_FOO) evaluates to 1 if CONFIG_FOO is set to 'm', 0
   * otherwise.
   */
  #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
  
  #ifdef CONFIG_TPL_BUILD
  #define _IS_TPL 1
  #endif
  
  #if defined(CONFIG_TPL_BUILD)
  #define config_val(cfg) _config_val(_IS_TPL, 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_TPL_##cfg, CONFIG_##cfg)
  #define ____config_val(__ignored, val, ...) val
  #else
  #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
  #endif
  
  /*
   * 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 */