Cosmos/source/Kernel-X86/10-CPU/Cosmos.CPU.x86/Memory/Old/DataLookupTable.cs

using System;
using System.Linq;
using System.Runtime.InteropServices;
using System.Threading.Tasks;

namespace Cosmos.CPU.x86.Memory.Old {
    // The DataLookupTable (DLT) basically is a double linked list.
    [StructLayout(LayoutKind.Explicit)]
    public unsafe struct DataLookupTable {
        public const int EntriesPerTable = 170;

        [FieldOffset(0)]
        public DataLookupTable* Previous;
        [FieldOffset(4)]
        public DataLookupTable* Next;

        [FieldOffset(8)]
        public DataLookupEntry FirstEntry;

        public unsafe DataLookupEntry* GetEntry(uint index) {
            fixed (DataLookupEntry* xFirstEntryPtr = &FirstEntry) {
                if (index == 0) {
                    return xFirstEntryPtr;
                } else {
                    return &xFirstEntryPtr[index];
                }
            }
        }
    }
}