Add hulk.linker_addresses module

src/hulk/hippo.d

@@ -6,8 +6,7 @@ module hulk.hippo;
 import hulk.header;
 import hulk.bootinfo;
 import hulk.klog;
-
-extern extern(C) ubyte * _hulk_bss_size;
+import hulk.linker_addresses;
 
 struct hippo
 {
@@ -50,7 +49,7 @@ struct hippo
         size_t usable_memory;
         ulong[2][5] reserved = [
             [header.bootinfo.hulk_phys, cast(ulong)header.total_size],
-            [header.bootinfo.bss_phys, cast(ulong)&_hulk_bss_size],
+            [header.bootinfo.bss_phys, LinkerAddresses.hulk_bss_size],
             [header.bootinfo.stack_phys, header.stack_size],
             [cast(ulong)header.bootinfo.fb.buffer, header.bootinfo.fb.height * header.bootinfo.fb.stride],
             [header.bootinfo.pt_phys, header.bootinfo.pt_size],