Remove PageTable.opIndex and .opIndexAssign, use .entry

src/hulk/pagetable.d

@@ -126,25 +126,9 @@ struct PageTable
      * @param level
      *   Page table level (0-4).
      */
-    public PageTableEntry opIndex(T)(T address, ulong level)
+    public PageTableEntry * entry(T)(T address, ulong level)
     {
-        return entries[pt_index(cast(ulong)address, level)];
-    }
-
-    /**
-     * Assign the PageTableEntry for the given address and page table level.
-     *
-     * @param pte
-     *   PageTableEntry value to assign.
-     * @param address
-     *   Address to look up the page table entry (ulong or pointer).
-     * @param level
-     *   Page table level (0-4).
-     */
-    public PageTableEntry opIndexAssign(T)(PageTableEntry pte, T address, ulong level)
-    {
-        entries[pt_index(cast(ulong)address, level)] = pte;
-        return pte;
+        return &entries[index(cast(ulong)address, level)];
     }
 
     /**
@@ -156,7 +140,7 @@ struct PageTable
      * @param level
      *   Page table level (0-4).
      */
-    public ulong pt_index(T)(T address, ulong level)
+    public ulong index(T)(T address, ulong level)
     {
         return (cast(ulong)address >> (39u - (9u * level))) & 0x1FFu;
     }