mirror of
https://github.com/danbulant/Cosmos
synced 2026-05-27 22:12:25 +00:00
2d5f637a91
Working context switching but far from stable. Changes needed to be made to the internals of cosmos to include mutex's in vital components (Heap, Thread Manager, ect). Context switching currently only switches the general registers and does not switch the MMX context, however this will be added in the future. Also when a thread currently dies it takes the whole system down, patches to the IDT handlers needed to be made to prevent system lockup in the future
558 lines
20 KiB
C#
558 lines
20 KiB
C#
using System.Runtime.InteropServices;
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using IL2CPU.API.Attribs;
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namespace Cosmos.Core {
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public class INTs {
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#region Enums
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// TODO: Protect IRQs like memory and ports are
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// TODO: Make IRQs so they are not hookable, and instead release high priority threads like FreeBSD (When we get threading)
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public enum EFlagsEnum : uint {
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Carry = 1,
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Parity = 1 << 2,
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AuxilliaryCarry = 1 << 4,
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Zero = 1 << 6,
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Sign = 1 << 7,
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Trap = 1 << 8,
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InterruptEnable = 1 << 9,
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Direction = 1 << 10,
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Overflow = 1 << 11,
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NestedTag = 1 << 14,
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Resume = 1 << 16,
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Virtual8086Mode = 1 << 17,
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AlignmentCheck = 1 << 18,
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VirtualInterrupt = 1 << 19,
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VirtualInterruptPending = 1 << 20,
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ID = 1 << 21
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}
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[StructLayout(LayoutKind.Explicit, Size = 0x68)]
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public struct TSS {
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[FieldOffset(0)]
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public ushort Link;
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[FieldOffset(4)]
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public uint ESP0;
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[FieldOffset(8)]
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public ushort SS0;
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[FieldOffset(12)]
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public uint ESP1;
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[FieldOffset(16)]
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public ushort SS1;
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[FieldOffset(20)]
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public uint ESP2;
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[FieldOffset(24)]
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public ushort SS2;
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[FieldOffset(28)]
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public uint CR3;
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[FieldOffset(32)]
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public uint EIP;
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[FieldOffset(36)]
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public EFlagsEnum EFlags;
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[FieldOffset(40)]
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public uint EAX;
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[FieldOffset(44)]
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public uint ECX;
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[FieldOffset(48)]
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public uint EDX;
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[FieldOffset(52)]
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public uint EBX;
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[FieldOffset(56)]
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public uint ESP;
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[FieldOffset(60)]
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public uint EBP;
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[FieldOffset(64)]
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public uint ESI;
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[FieldOffset(68)]
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public uint EDI;
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[FieldOffset(72)]
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public ushort ES;
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[FieldOffset(76)]
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public ushort CS;
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[FieldOffset(80)]
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public ushort SS;
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[FieldOffset(84)]
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public ushort DS;
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[FieldOffset(88)]
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public ushort FS;
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[FieldOffset(92)]
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public ushort GS;
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[FieldOffset(96)]
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public ushort LDTR;
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[FieldOffset(102)]
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public ushort IOPBOffset;
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}
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[StructLayout(LayoutKind.Explicit, Size = 512)]
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public struct MMXContext {
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}
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[StructLayout(LayoutKind.Explicit, Size = 80)]
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public struct IRQContext
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{
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[FieldOffset(0)]
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public unsafe MMXContext* MMXContext;
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[FieldOffset(4)]
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public uint EDI;
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[FieldOffset(8)]
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public uint ESI;
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[FieldOffset(12)]
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public uint EBP;
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[FieldOffset(16)]
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public uint ESP;
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[FieldOffset(20)]
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public uint EBX;
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[FieldOffset(24)]
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public uint EDX;
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[FieldOffset(28)]
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public uint ECX;
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[FieldOffset(32)]
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public uint EAX;
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[FieldOffset(36)]
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public uint Interrupt;
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[FieldOffset(40)]
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public uint Param;
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[FieldOffset(44)]
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public uint EIP;
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[FieldOffset(48)]
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public uint CS;
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[FieldOffset(52)]
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public EFlagsEnum EFlags;
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[FieldOffset(56)]
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public uint UserESP;
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}
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#endregion
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[AsmMarker(AsmMarker.Type.Int_LastKnownAddress)]
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private static uint mLastKnownAddress;
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public static uint mStackContext;
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private static IRQDelegate[] mIRQ_Handlers = new IRQDelegate[256];
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// We used to use:
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//Interrupts.IRQ01 += HandleKeyboardInterrupt;
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// But at one point we had issues with multi cast delegates, so we changed to this single cast option.
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// [1:48:37 PM] Matthijs ter Woord: the issues were: "they didn't work, would crash kernel". not sure if we still have them..
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public static void SetIntHandler(byte aIntNo, IRQDelegate aHandler) {
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mIRQ_Handlers[aIntNo] = aHandler;
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}
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public static void SetIrqHandler(byte aIrqNo, IRQDelegate aHandler) {
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SetIntHandler((byte)(0x20 + aIrqNo), aHandler);
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}
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private static void IRQ(uint irq, ref IRQContext aContext) {
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var xCallback = mIRQ_Handlers[irq];
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if (xCallback != null) {
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xCallback(ref aContext);
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}
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}
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public static void HandleInterrupt_Default(ref IRQContext aContext) {
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if (aContext.Interrupt >= 0x20 && aContext.Interrupt <= 0x2F) {
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if (aContext.Interrupt >= 0x28) {
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Global.PIC.EoiSlave();
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} else {
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Global.PIC.EoiMaster();
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}
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}
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}
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public delegate void IRQDelegate(ref IRQContext aContext);
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public delegate void ExceptionInterruptDelegate(ref IRQContext aContext, ref bool aHandled);
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#region Default Interrupt Handlers
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//IRQ 0 - System timer. Reserved for the system. Cannot be changed by a user.
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public static void HandleInterrupt_20(ref IRQContext aContext) {
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IRQ(0x20, ref aContext);
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Global.PIC.EoiMaster();
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}
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//public static IRQDelegate IRQ01;
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//IRQ 1 - Keyboard. Reserved for the system. Cannot be altered even if no keyboard is present or needed.
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public static void HandleInterrupt_21(ref IRQContext aContext) {
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IRQ(0x21, ref aContext);
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Global.PIC.EoiMaster();
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}
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public static void HandleInterrupt_22(ref IRQContext aContext) {
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IRQ(0x22, ref aContext);
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Global.PIC.EoiMaster();
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}
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public static void HandleInterrupt_23(ref IRQContext aContext) {
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IRQ(0x23, ref aContext);
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Global.PIC.EoiMaster();
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}
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public static void HandleInterrupt_24(ref IRQContext aContext) {
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IRQ(0x24, ref aContext);
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Global.PIC.EoiMaster();
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}
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public static void HandleInterrupt_25(ref IRQContext aContext) {
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IRQ(0x25, ref aContext);
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Global.PIC.EoiMaster();
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}
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public static void HandleInterrupt_26(ref IRQContext aContext) {
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IRQ(0x26, ref aContext);
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Global.PIC.EoiMaster();
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}
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public static void HandleInterrupt_27(ref IRQContext aContext) {
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IRQ(0x27, ref aContext);
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Global.PIC.EoiMaster();
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}
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public static void HandleInterrupt_28(ref IRQContext aContext) {
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IRQ(0x28, ref aContext);
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Global.PIC.EoiSlave();
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}
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//IRQ 09 - (Added for AMD PCNet network card)
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//public static IRQDelegate IRQ09;
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public static void HandleInterrupt_29(ref IRQContext aContext) {
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IRQ(0x29, ref aContext);
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Global.PIC.EoiSlave();
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}
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//IRQ 10 - (Added for VIA Rhine network card)
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//public static IRQDelegate IRQ10;
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public static void HandleInterrupt_2A(ref IRQContext aContext) {
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IRQ(0x2A, ref aContext);
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Global.PIC.EoiSlave();
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}
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//IRQ 11 - (Added for RTL8139 network card)
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//public static IRQDelegate IRQ11;
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public static void HandleInterrupt_2B(ref IRQContext aContext) {
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IRQ(0x2B, ref aContext);
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Global.PIC.EoiSlave();
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}
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public static void HandleInterrupt_2C(ref IRQContext aContext) {
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IRQ(0x2C, ref aContext);
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Global.PIC.EoiSlave();
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}
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public static void HandleInterrupt_2D(ref IRQContext aContext) {
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IRQ(0x2D, ref aContext);
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Global.PIC.EoiSlave();
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}
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//IRQ 14 - Primary IDE. If no Primary IDE this can be changed
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public static void HandleInterrupt_2E(ref IRQContext aContext) {
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IRQ(0x2E, ref aContext);
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Global.PIC.EoiSlave();
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}
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//IRQ 15 - Secondary IDE
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public static void HandleInterrupt_2F(ref IRQContext aContext) {
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IRQ(0x2F, ref aContext);
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Global.PIC.EoiSlave();
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}
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public static event IRQDelegate Interrupt30;
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// Interrupt 0x30, enter VMM
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public static void HandleInterrupt_30(ref IRQContext aContext) {
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if (Interrupt30 != null) {
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Interrupt30(ref aContext);
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}
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}
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public static void HandleInterrupt_35(ref IRQContext aContext) {
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aContext.EAX *= 2;
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aContext.EBX *= 2;
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aContext.ECX *= 2;
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aContext.EDX *= 2;
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}
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public static void HandleInterrupt_40(ref IRQContext aContext) {
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IRQ(0x40, ref aContext);
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}
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public static void HandleInterrupt_41(ref IRQContext aContext) {
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IRQ(0x41, ref aContext);
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}
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public static void HandleInterrupt_42(ref IRQContext aContext) {
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IRQ(0x42, ref aContext);
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}
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public static void HandleInterrupt_43(ref IRQContext aContext) {
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IRQ(0x43, ref aContext);
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}
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public static void HandleInterrupt_44(ref IRQContext aContext) {
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IRQ(0x44, ref aContext);
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}
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public static void HandleInterrupt_45(ref IRQContext aContext) {
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IRQ(0x45, ref aContext);
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}
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public static void HandleInterrupt_46(ref IRQContext aContext) {
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IRQ(0x46, ref aContext);
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}
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public static void HandleInterrupt_47(ref IRQContext aContext) {
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IRQ(0x47, ref aContext);
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}
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public static void HandleInterrupt_48(ref IRQContext aContext) {
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IRQ(0x48, ref aContext);
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}
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public static void HandleInterrupt_49(ref IRQContext aContext) {
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IRQ(0x49, ref aContext);
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}
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#endregion
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#region CPU Exceptions
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public static IRQDelegate GeneralProtectionFault;
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public static void HandleInterrupt_00(ref IRQContext aContext) {
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HandleException(aContext.EIP, "Divide by zero", "EDivideByZero", ref aContext, aContext.EIP);
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}
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public static void HandleInterrupt_01(ref IRQContext aContext) {
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HandleException(aContext.EIP, "Debug Exception", "Debug Exception", ref aContext);
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}
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public static void HandleInterrupt_02(ref IRQContext aContext) {
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HandleException(aContext.EIP, "Non Maskable Interrupt Exception", "Non Maskable Interrupt Exception", ref aContext);
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}
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public static void HandleInterrupt_03(ref IRQContext aContext) {
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HandleException(aContext.EIP, "Breakpoint Exception", "Breakpoint Exception", ref aContext);
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}
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public static void HandleInterrupt_04(ref IRQContext aContext) {
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HandleException(aContext.EIP, "Into Detected Overflow Exception", "Into Detected Overflow Exception", ref aContext);
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}
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public static void HandleInterrupt_05(ref IRQContext aContext) {
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HandleException(aContext.EIP, "Out of Bounds Exception", "Out of Bounds Exception", ref aContext);
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}
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public static void HandleInterrupt_06(ref IRQContext aContext) {
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// although mLastKnownAddress is a static, we need to get it here, any subsequent calls will change the value!!!
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var xLastKnownAddress = mLastKnownAddress;
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HandleException(aContext.EIP, "Invalid Opcode", "EInvalidOpcode", ref aContext, xLastKnownAddress);
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}
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public static void HandleInterrupt_07(ref IRQContext aContext) {
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HandleException(aContext.EIP, "No Coprocessor Exception", "No Coprocessor Exception", ref aContext);
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}
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public static void HandleInterrupt_08(ref IRQContext aContext) {
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HandleException(aContext.EIP, "Double Fault Exception", "Double Fault Exception", ref aContext);
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}
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public static void HandleInterrupt_09(ref IRQContext aContext) {
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HandleException(aContext.EIP, "Coprocessor Segment Overrun Exception", "Coprocessor Segment Overrun Exception", ref aContext);
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}
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public static void HandleInterrupt_0A(ref IRQContext aContext) {
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HandleException(aContext.EIP, "Bad TSS Exception", "Bad TSS Exception", ref aContext);
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}
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public static void HandleInterrupt_0B(ref IRQContext aContext) {
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HandleException(aContext.EIP, "Segment Not Present", "Segment Not Present", ref aContext);
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}
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public static void HandleInterrupt_0C(ref IRQContext aContext) {
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HandleException(aContext.EIP, "Stack Fault Exception", "Stack Fault Exception", ref aContext);
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}
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public static void HandleInterrupt_0D(ref IRQContext aContext) {
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if (GeneralProtectionFault != null) {
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GeneralProtectionFault(ref aContext);
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} else {
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HandleException(aContext.EIP, "General Protection Fault", "GPF", ref aContext);
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}
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}
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public static void HandleInterrupt_0E(ref IRQContext aContext) {
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HandleException(aContext.EIP, "Page Fault Exception", "Page Fault Exception", ref aContext);
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}
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public static void HandleInterrupt_0F(ref IRQContext aContext) {
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HandleException(aContext.EIP, "Unknown Interrupt Exception", "Unknown Interrupt Exception", ref aContext);
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}
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public static void HandleInterrupt_10(ref IRQContext aContext) {
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HandleException(aContext.EIP, "x87 Floating Point Exception", "Coprocessor Fault Exception", ref aContext);
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}
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public static void HandleInterrupt_11(ref IRQContext aContext) {
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HandleException(aContext.EIP, "Alignment Exception", "Alignment Exception", ref aContext);
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}
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public static void HandleInterrupt_12(ref IRQContext aContext) {
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HandleException(aContext.EIP, "Machine Check Exception", "Machine Check Exception", ref aContext);
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}
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public static void HandleInterrupt_13(ref IRQContext aContext) {
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HandleException(aContext.EIP, "SIMD Floating Point Exception", "SIMD Floating Point Exception", ref aContext);
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}
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#endregion
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private static void HandleException(uint aEIP, string aDescription, string aName, ref IRQContext ctx, uint lastKnownAddressValue = 0) {
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// At this point we are in a very unstable state.
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// Try not to use any Cosmos routines, just
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// report a crash dump.
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const string xHex = "0123456789ABCDEF";
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uint xPtr = ctx.EIP;
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// we're printing exception info to the screen now:
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// 0/0: x
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// 1/0: exception number in hex
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unsafe
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{
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byte* xAddress = (byte*)0xB8000;
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PutErrorChar(0, 00, ' ');
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PutErrorChar(0, 01, '*');
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PutErrorChar(0, 02, '*');
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PutErrorChar(0, 03, '*');
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PutErrorChar(0, 04, ' ');
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PutErrorChar(0, 05, 'C');
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PutErrorChar(0, 06, 'P');
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PutErrorChar(0, 07, 'U');
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PutErrorChar(0, 08, ' ');
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PutErrorChar(0, 09, 'E');
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PutErrorChar(0, 10, 'x');
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PutErrorChar(0, 11, 'c');
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PutErrorChar(0, 12, 'e');
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PutErrorChar(0, 13, 'p');
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PutErrorChar(0, 14, 't');
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PutErrorChar(0, 15, 'i');
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PutErrorChar(0, 16, 'o');
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PutErrorChar(0, 17, 'n');
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PutErrorChar(0, 18, ' ');
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PutErrorChar(0, 19, 'x');
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PutErrorChar(0, 20, xHex[(int)((ctx.Interrupt >> 4) & 0xF)]);
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PutErrorChar(0, 21, xHex[(int)(ctx.Interrupt & 0xF)]);
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PutErrorChar(0, 22, ' ');
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PutErrorChar(0, 23, '*');
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PutErrorChar(0, 24, '*');
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PutErrorChar(0, 25, '*');
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PutErrorChar(0, 26, ' ');
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if (lastKnownAddressValue != 0) {
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PutErrorString(1, 0, "Last known address: 0x");
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PutErrorChar(1, 22, xHex[(int)((lastKnownAddressValue >> 28) & 0xF)]);
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PutErrorChar(1, 23, xHex[(int)((lastKnownAddressValue >> 24) & 0xF)]);
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PutErrorChar(1, 24, xHex[(int)((lastKnownAddressValue >> 20) & 0xF)]);
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PutErrorChar(1, 25, xHex[(int)((lastKnownAddressValue >> 16) & 0xF)]);
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PutErrorChar(1, 26, xHex[(int)((lastKnownAddressValue >> 12) & 0xF)]);
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PutErrorChar(1, 27, xHex[(int)((lastKnownAddressValue >> 8) & 0xF)]);
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PutErrorChar(1, 28, xHex[(int)((lastKnownAddressValue >> 4) & 0xF)]);
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PutErrorChar(1, 29, xHex[(int)(lastKnownAddressValue & 0xF)]);
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}
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}
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// lock up
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while (true) {
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}
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}
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private static void PutErrorChar(int line, int col, char c) {
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unsafe
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{
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byte* xAddress = (byte*)0xB8000;
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xAddress += ((line * 80) + col) * 2;
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xAddress[0] = (byte)c;
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xAddress[1] = 0x0C;
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}
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}
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private static void PutErrorString(int line, int startCol, string error) {
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for (int i = 0; i < error.Length; i++) {
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PutErrorChar(line, startCol + i, error[i]);
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}
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}
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// This is to trick IL2CPU to compile it in
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//TODO: Make a new attribute that IL2CPU sees when scanning to force inclusion so we dont have to do this.
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// We dont actually need to call this method
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public static void Dummy() {
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// Compiler magic
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bool xTest = false;
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if (xTest) {
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unsafe
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{
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mStackContext = 0;
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var xCtx = new IRQContext();
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HandleInterrupt_Default(ref xCtx);
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HandleInterrupt_00(ref xCtx);
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HandleInterrupt_01(ref xCtx);
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HandleInterrupt_02(ref xCtx);
|
|
HandleInterrupt_03(ref xCtx);
|
|
HandleInterrupt_04(ref xCtx);
|
|
HandleInterrupt_05(ref xCtx);
|
|
HandleInterrupt_06(ref xCtx);
|
|
HandleInterrupt_07(ref xCtx);
|
|
HandleInterrupt_08(ref xCtx);
|
|
HandleInterrupt_09(ref xCtx);
|
|
HandleInterrupt_0A(ref xCtx);
|
|
HandleInterrupt_0B(ref xCtx);
|
|
HandleInterrupt_0C(ref xCtx);
|
|
HandleInterrupt_0D(ref xCtx);
|
|
HandleInterrupt_0E(ref xCtx);
|
|
HandleInterrupt_0F(ref xCtx);
|
|
HandleInterrupt_10(ref xCtx);
|
|
HandleInterrupt_11(ref xCtx);
|
|
HandleInterrupt_12(ref xCtx);
|
|
HandleInterrupt_13(ref xCtx);
|
|
HandleInterrupt_20(ref xCtx);
|
|
HandleInterrupt_21(ref xCtx);
|
|
HandleInterrupt_22(ref xCtx);
|
|
HandleInterrupt_23(ref xCtx);
|
|
HandleInterrupt_24(ref xCtx);
|
|
HandleInterrupt_25(ref xCtx);
|
|
HandleInterrupt_26(ref xCtx);
|
|
HandleInterrupt_27(ref xCtx);
|
|
HandleInterrupt_28(ref xCtx);
|
|
HandleInterrupt_29(ref xCtx);
|
|
HandleInterrupt_2A(ref xCtx);
|
|
HandleInterrupt_2B(ref xCtx);
|
|
HandleInterrupt_2C(ref xCtx);
|
|
HandleInterrupt_2D(ref xCtx);
|
|
HandleInterrupt_2E(ref xCtx);
|
|
HandleInterrupt_2F(ref xCtx);
|
|
HandleInterrupt_30(ref xCtx);
|
|
HandleInterrupt_35(ref xCtx);
|
|
HandleInterrupt_40(ref xCtx);
|
|
HandleInterrupt_41(ref xCtx);
|
|
HandleInterrupt_42(ref xCtx);
|
|
HandleInterrupt_43(ref xCtx);
|
|
HandleInterrupt_44(ref xCtx);
|
|
HandleInterrupt_45(ref xCtx);
|
|
HandleInterrupt_46(ref xCtx);
|
|
HandleInterrupt_47(ref xCtx);
|
|
HandleInterrupt_48(ref xCtx);
|
|
HandleInterrupt_49(ref xCtx);
|
|
Processing.ProcessorScheduler.SwitchTask();
|
|
Processing.ProcessorScheduler.EntryPoint();
|
|
}
|
|
}
|
|
}
|
|
|
|
}
|
|
}
|