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authorStefan Reinauer <reinauer@chromium.org>2012-12-14 13:06:49 -0800
committerRonald G. Minnich <rminnich@gmail.com>2012-12-14 23:59:05 +0100
commit9f0431726353a5eaa259776ab43e57163b74605e (patch)
tree82a2003579ebb964acc36094c2b1e8d6540f5335
parent8af0d03fd49f9c88db98ef7b3c2d95bf1cd0f319 (diff)
downloadcoreboot-9f0431726353a5eaa259776ab43e57163b74605e.tar.xz
libpayload: add kconfig.h
This implements the linux kernel's macros to handle boolean CONFIG_ variables more easily. Change-Id: I595f9db652d019fe72e231111258ec609bec9d4e Signed-off-by: Stefan Reinauer <reinauer@google.com> Reviewed-on: http://review.coreboot.org/2036 Tested-by: build bot (Jenkins) Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
-rw-r--r--payloads/libpayload/include/kconfig.h21
1 files changed, 21 insertions, 0 deletions
diff --git a/payloads/libpayload/include/kconfig.h b/payloads/libpayload/include/kconfig.h
new file mode 100644
index 0000000000..3d7d768f9c
--- /dev/null
+++ b/payloads/libpayload/include/kconfig.h
@@ -0,0 +1,21 @@
+#ifndef __KCONFIG_H__
+#define __KCONFIG_H__
+
+#include <libpayload-config.h>
+
+/*
+ * 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, 0)
+#define ___config_enabled(__ignored, val, ...) val
+
+#define IS_ENABLED(option) config_enabled(option)
+#endif