/// <summary>
/// Sets up the GDT table and entries
/// </summary>
public static void Setup(Addr addr)
{
KernelMessage.Write("Setup GDT...");
gdtTableAddress = addr;
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();
KernelMessage.WriteLine("Done");
}
public void SetEntry(ushort index, DescriptorTableEntry source)
{
Assert.InRange(index, Length);
//DescriptorTableEntry.CopyTo(&source, entries + index);
entries[index] = source;
}
public void AddEntry(DescriptorTableEntry source)
{
Length++;
SetEntry((ushort)(Length - 1), source);
}