include/sm_io_mod_dispatch.h: add macros for declaring structure in linker table

include/sm_io_mod_dispatch.h

@@ -20,7 +20,26 @@ typedef struct {
     const smio_bootstrap_ops_t *bootstrap_ops;
 } smio_mod_dispatch_t;
 
-extern const smio_mod_dispatch_t smio_mod_dispatch [];
+/*
+ * WARNING! Using SMIO_MOD_DECLARE requires .smio_mod_dispatch section in linker script
+ * .smio_mod_dispatch : ALIGN(4)
+ * {
+ * 	 _smio_mod_dispatch = .;
+ * 	 KEEP(*(.smio_mod_dispatch))
+ *   _esmio_mod_dispatch = .;
+ * }
+*/
+
+extern const smio_mod_dispatch_t *_smio_mod_dispatch;
+extern const smio_mod_dispatch_t *_esmio_mod_dispatch;
+
+#define SMIO_MOD_DECLARE(mod_id, mod_name, mod_bootstrap_ops)                   \
+    const smio_mod_dispatch_t __attribute__ ((section (".smio_mod_dispatch")))  \
+        smio_mod_ ## mod_id ## _ ## mod_name = {                                \
+            .id = mod_id,                                                       \
+            .name = mod_name,                                                   \
+            .bootstrap_ops = &mod_bootstrap_ops                                 \
+        };
 
 #ifdef __cplusplus
 }