/// <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();
}
/// <summary>
/// Sets up the GDT table and entries
/// </summary>
public static void Setup(Addr addr)
{
KernelMessage.Write("Setup GDT...");
GdtTableAddress = addr;
GdtTable = (DescriptorTable *)GdtTableAddress;
GdtTable->Clear();
GdtTable->AdressOfEntries = GdtTableAddress + DescriptorTable.StructSize;
//Null segment
var nullEntry = DescriptorTableEntry.CreateNullDescriptor();
GdtTable->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.CodeSegment_Confirming = true;
GdtTable->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;
GdtTable->AddEntry(dataEntry);
Flush();
KernelMessage.WriteLine("Done");
}
/// <summary>
/// Sets up the GDT table and entries
/// </summary>
public static void Setup()
{
table = (DescriptorTable*)Address.GDTTable;
table->Clear();
table->AdressOfEntries = Address.GDTTable + DescriptorTable.StructSize;
// Null segment
var nullEntry = DescriptorTableEntry.CreateNullDescriptor();
table->AddEntry(nullEntry);
// Code Segment
var kernelCodeEntry = DescriptorTableEntry.CreateCode(0, 0xFFFFFFFF);
kernelCodeEntry.CodeSegment_Readable = true;
kernelCodeEntry.PriviligeRing = 0;
kernelCodeEntry.Present = true;
kernelCodeEntry.AddressMode = DescriptorTableEntry.EAddressMode.Bits32;
kernelCodeEntry.Granularity = true;
table->AddEntry(kernelCodeEntry);
// Data Segment
var kernelDataEntry = DescriptorTableEntry.CreateData(0, 0xFFFFFFFF);
kernelDataEntry.DataSegment_Writable = true;
kernelDataEntry.PriviligeRing = 0;
kernelDataEntry.Present = true;
kernelDataEntry.AddressMode = DescriptorTableEntry.EAddressMode.Bits32;
kernelDataEntry.Granularity = true;
table->AddEntry(kernelDataEntry);
// User Code Segment
var userCodeEntry = DescriptorTableEntry.CreateCode(0, 0xFFFFFFFF);
userCodeEntry.CodeSegment_Readable = true;
userCodeEntry.PriviligeRing = 3;
userCodeEntry.Present = true;
userCodeEntry.AddressMode = DescriptorTableEntry.EAddressMode.Bits32;
userCodeEntry.Granularity = true;
table->AddEntry(userCodeEntry);
// User Data Segment
var userDataEntry = DescriptorTableEntry.CreateData(0, 0xFFFFFFFF);
userDataEntry.DataSegment_Writable = true;
userDataEntry.PriviligeRing = 3;
userDataEntry.Present = true;
userDataEntry.AddressMode = DescriptorTableEntry.EAddressMode.Bits32;
userDataEntry.Granularity = true;
table->AddEntry(userDataEntry);
// TSS Segment
var tssEntry = DescriptorTableEntry.CreateData(Address.TSS, Address.TSSSize);
tssEntry.DataSegment_Writable = true;
tssEntry.PriviligeRing = 0;
tssEntry.Present = true;
tssEntry.AddressMode = DescriptorTableEntry.EAddressMode.Bits32;
tssEntry.Granularity = true;
table->AddEntry(tssEntry);
Flush();
}
/// <summary>
/// Sets up the GDT table and entries
/// </summary>
public static void Setup(Addr addr)
{
KernelMessage.Write("Setup GDT...");
GdtTableAddress = addr;
GdtTable = (DescriptorTable *)GdtTableAddress;
GdtTable->Clear();
GdtTable->AdressOfEntries = GdtTableAddress + DescriptorTable.StructSize;
// 0 - Null segment
var entry = DescriptorTableEntry.CreateNullDescriptor();
GdtTable->AddEntry(entry);
// 1 - code segment
entry = DescriptorTableEntry.CreateCode(0, 0xFFFFFFFF);
entry.CodeSegment_Readable = true;
entry.PriviligeRing = 0;
entry.Present = true;
entry.AddressMode = DescriptorTableEntry.EAddressMode.Bits32;
//codeEntry.CodeSegment_Confirming = true;
GdtTable->AddEntry(entry);
// 2 - data segment
entry = DescriptorTableEntry.CreateData(0, 0xFFFFFFFF);
entry.DataSegment_Writable = true;
entry.PriviligeRing = 0;
entry.Present = true;
entry.AddressMode = DescriptorTableEntry.EAddressMode.Bits32;
GdtTable->AddEntry(entry);
// 3 - reserved
entry = DescriptorTableEntry.CreateData(0, 0xFFFFFFFF);
entry.DataSegment_Writable = true;
entry.PriviligeRing = 0;
entry.Present = true;
entry.AddressMode = DescriptorTableEntry.EAddressMode.Bits32;
GdtTable->AddEntry(entry);
// 4 - kernel thread storage
entry = DescriptorTableEntry.CreateData(0, 0xFFFFFFFF);
entry.DataSegment_Writable = true;
entry.PriviligeRing = 0;
entry.Present = true;
entry.AddressMode = DescriptorTableEntry.EAddressMode.Bits32;
GdtTable->AddEntry(entry);
// 5 - reserved
entry = DescriptorTableEntry.CreateData(0, 0xFFFFFFFF);
entry.DataSegment_Writable = true;
entry.PriviligeRing = 0;
entry.Present = true;
entry.AddressMode = DescriptorTableEntry.EAddressMode.Bits32;
GdtTable->AddEntry(entry);
// ---
// 6 - user code segment
entry = DescriptorTableEntry.CreateCode(0, 0xFFFFFFFF);
entry.CodeSegment_Readable = true;
entry.PriviligeRing = 3;
entry.Present = true;
entry.AddressMode = DescriptorTableEntry.EAddressMode.Bits32;
entry.CodeSegment_Confirming = false;
GdtTable->AddEntry(entry);
// 7 - user data segment
entry = DescriptorTableEntry.CreateData(0, 0xFFFFFFFF);
entry.DataSegment_Writable = true;
entry.PriviligeRing = 3;
entry.Present = true;
entry.AddressMode = DescriptorTableEntry.EAddressMode.Bits32;
GdtTable->AddEntry(entry);
// 8 - thread storage segment for FS register
entry = DescriptorTableEntry.CreateData(0, 0xFFFFFFFF);
entry.DataSegment_Writable = true;
entry.PriviligeRing = 3;
entry.Present = true;
entry.AddressMode = DescriptorTableEntry.EAddressMode.Bits32;
GdtTable->AddEntry(entry);
Flush();
KernelMessage.WriteLine("Done");
}
public static void KernelSetup(Addr gdtAddr)
{
GdtTableAddress = gdtAddr;
GdtTable = (DescriptorTable *)GdtTableAddress;
}
/// <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();
}
