/// <summary>
/// Sets up the GDT table and entries
/// </summary>
public static void Setup()
{
table = (DescriptorTable *)gdtTableAddress;
table->Clear();
table->AdressOfEntries = gdtTableAddress + DescriptorTable.StructSize;
//Null segment
var nullEntry = DescriptorTableEntry.CreateNullDescriptor();
table->AddEntry(nullEntry);
//code segment
var codeEntry = DescriptorTableEntry.CreateCode(0, 0xFFFFFFFF);
codeEntry.CodeSegment_Readable = true;
codeEntry.PriviligeRing = 0;
codeEntry.Present = true;
codeEntry.AddressMode = DescriptorTableEntry.EAddressMode.Bits32;
codeEntry.Granularity = true;
table->AddEntry(codeEntry);
//data segment
var dataEntry = DescriptorTableEntry.CreateData(0, 0xFFFFFFFF);
dataEntry.DataSegment_Writable = true;
dataEntry.PriviligeRing = 0;
dataEntry.Present = true;
dataEntry.AddressMode = DescriptorTableEntry.EAddressMode.Bits32;
dataEntry.Granularity = true;
table->AddEntry(dataEntry);
Flush();
}
public void SetEntry(ushort index, DescriptorTableEntry source)
{
Assert.InRange(index, Length);
DescriptorTableEntry.CopyTo(&source, entries + index);
}
public void AddEntry(DescriptorTableEntry source)
{
Length++;
SetEntry((ushort)(Length - 1), source);
}
public static void CopyTo(DescriptorTableEntry* source, DescriptorTableEntry* destination)
{
Memory.Copy((uint)source, (uint)destination, EntrySize);
}
public static void Clear(DescriptorTableEntry* entry)
{
Memory.Clear((uint)entry, EntrySize);
}
public void SetEntry(ushort index, DescriptorTableEntry source)
{
Assert.InRange(index, Length);
DescriptorTableEntry.CopyTo(&source, entries + index);
}
public void AddEntry(DescriptorTableEntry source)
{
Length++;
SetEntry((ushort)(Length - 1), source);
}