pb-config: Move config storage modules to "platform" modules in discover code

There's no need to include the config storage code in lib/ as only the
discover server should be using it.

This change moves the config-storage code to discover/, with the
platform-specific parts moved to a 'struct platform'. Each platform has
a probe function, which is called during init. The first probe function
to return a platform is used.

At present we only have the one platform, but it's now non-intrusive to
add others.

We keep an array of platform pointers in a separate ("platforms")
section, to allow the test module to drop-in its own test "platform".

Signed-off-by: Jeremy Kerr <jk@ozlabs.org>

1 files changed, 34 insertions, 0 deletions

diff --git a/discover/platform.h b/discover/platform.h
new file mode 100644
index 0000000..44315fa
--- /dev/null
+++ b/discover/platform.h
@@ -0,0 +1,34 @@
+#ifndef PLATFORM_H
+#define PLATFORM_H
+
+#include <types/types.h>
+
+struct platform {
+	const char	*name;
+	bool		(*probe)(struct platform *, void *);
+	int		(*load_config)(struct platform *, struct config *);
+	int		(*save_config)(struct platform *, struct config *);
+	void		*platform_data;
+};
+
+int platform_init(void *ctx);
+int platform_fini(void);
+
+/* configuration interface */
+const struct config *config_get(void);
+int config_set(struct config *config);
+void config_set_autoboot(bool autoboot_enabled);
+
+/* for use by the platform-specific storage code */
+void config_set_defaults(struct config *config);
+
+#define __platform_ptrname(_n) __platform_ ## _n
+#define  _platform_ptrname(_n) __platform_ptrname(_n)
+
+#define register_platform(p) \
+	static __attribute__((section("platforms"))) \
+		__attribute__((used)) \
+		struct platform * _platform_ptrname(__COUNTER__) = &p;
+
+#endif /* PLATFORM_H */
+