public static void Break() { KernelMessage.Write("<BREAK>"); while (true) { Native.Nop(); } }
/// <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(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"); }