Move source files to src/, add Makefile, fix all build and linkage errors, etc.

exosphere/linker.ld

@@ -0,0 +1,16 @@
+ENTRY(__start_cold)
+SECTIONS
+{
+    /* DUMMY LINKER SCRIPT, REPLACE ASAP */
+    . = 0xF0000000;
+    
+    __start__ = ABSOLUTE(.);
+
+    .text   : ALIGN(4) { *(.text*); . = ALIGN(4); }
+    .rodata : ALIGN(4) { *(.rodata*); . = ALIGN(4); }
+    .data   : ALIGN(4) { *(.data*); . = ALIGN(8); *(.bss* COMMON); . = ALIGN(8); }
+
+    . = ALIGN(4);
+
+    __end__ = ABSOLUTE(.);
+}