loader: map pfndb and cleanup

src/loader/pmap.zig

@@ -1,3 +1,6 @@
+//! Generic page map manipulation code.
+//! Part of the code is duplicated from the kernel :(
+
 const r = @import("root");
 const mem = r.mem;
 
@@ -167,11 +170,6 @@ pub const PMap = struct {
             }
         }
 
-        pub fn walk_down_resolve(self: *Cursor, target_level: usize) bool {
-            self.walk_down(target_level, false, false) catch return false;
-            return true;
-        }
-
         /// Choose the largest page size that satisfies the alignment and
         /// size constraints of the current VA, PA, and remaining byte count.
         /// Tries large pages first; falls back to 4K.