Add io helper functions

sw/io.c

@@ -0,0 +1,6 @@
+#include <io.h>
+
+int io_remap(int region) {
+    *(unsigned char*)IO_REMAP = region;
+    return (*(unsigned char*)IO_REMAP == region);
+}

sw/io.h

@@ -1,6 +1,15 @@
 #ifndef _IO_H
 #define IO_H
 
-#define IO_REMAP *(unsigned char*)0x7f00
+
+#define IO_REMAP 0x7f00
+
+
+enum io_regions {
+    io_region_de10lite = 0,
+};
+
+
+int io_remap(int region);
 
 #endif

sw/main.c

@@ -1,5 +1,6 @@
 #include <io.h>
 
 int main() {
-   IO_REMAP = 1; 
+    io_remap(io_region_de10lite);
+    return 0;
 }