mirror of
https://github.com/danbulant/Cosmos
synced 2026-05-19 20:39:01 +00:00
111 lines
3.7 KiB
C#
111 lines
3.7 KiB
C#
using System;
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using System.Linq;
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using Cosmos.Assembler;
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using Cosmos.Assembler.x86;
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namespace Cosmos.Debug.DebugStub {
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public class Screen : Cosmos.Assembler.Code {
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public override void Assemble() {
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new Comment("X#: Group DebugStub");
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new Comment("X#: procedure Cls {");
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new Label("DebugStub_Cls");
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new Comment("VidBase");
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new Comment("X#: ESI = $B8000");
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new Mov{ DestinationReg = RegistersEnum.ESI, SourceValue = 0xB8000 };
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new Comment("X#: BeginLoop:");
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new Label("DebugStub_Cls_BeginLoop");
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new Comment("Text");
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new Comment("X#: AL = $00");
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new Mov{ DestinationReg = RegistersEnum.AL, SourceValue = 0x00 };
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new Comment("X#: ESI[0] = AL");
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new Mov{ DestinationReg = RegistersEnum.ESI, DestinationIsIndirect = true, DestinationDisplacement = 0, SourceReg = RegistersEnum.AL };
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new Comment("X#: ESI + 1");
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new INC { DestinationReg = RegistersEnum.ESI };
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new Comment("Colour");
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new Comment("X#: AL = $0A");
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new Mov{ DestinationReg = RegistersEnum.AL, SourceValue = 0x0A };
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new Comment("X#: ESI[0] = AL");
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new Mov{ DestinationReg = RegistersEnum.ESI, DestinationIsIndirect = true, DestinationDisplacement = 0, SourceReg = RegistersEnum.AL };
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new Comment("X#: ESI + 1");
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new INC { DestinationReg = RegistersEnum.ESI };
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new Comment("End of Video Area");
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new Comment("VidBase + 25 * 80 * 2 = B8FA0");
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new Comment("X#: If (ESI < $B8FA0) goto BeginLoop");
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new Compare { DestinationReg = RegistersEnum.ESI, SourceValue = 0xB8FA0 };
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new ConditionalJump { Condition = ConditionalTestEnum.LessThan, DestinationLabel = "DebugStub_Cls_BeginLoop" };
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new Comment("X#: }");
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new Label("DebugStub_Cls_Exit");
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new Return();
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new Comment("X#: procedure DisplayWaitMsg {");
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new Label("DebugStub_DisplayWaitMsg");
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new Comment("http://wiki.osdev.org/Text_UI");
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new Comment("Later can cycle for x changes of second register:");
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new Comment("http://wiki.osdev.org/Time_And_Date");
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new Comment("X#: ESI = @..DebugWaitMsg");
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new Mov { DestinationReg = RegistersEnum.ESI , SourceRef = Cosmos.Assembler.ElementReference.New("DebugWaitMsg") };
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new Comment("VidBase");
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new Comment("X#: EDI = $B8000");
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new Mov{ DestinationReg = RegistersEnum.EDI, SourceValue = 0xB8000 };
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new Comment("10 lines down, 20 cols in (10 * 80 + 20) * 2)");
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new Comment("X#: EDI + 1640");
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new Add { DestinationReg = RegistersEnum.EDI, SourceValue = 1640 };
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new Comment("Read and copy string till 0 terminator");
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new Comment("X#: ReadChar:");
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new Label("DebugStub_DisplayWaitMsg_ReadChar");
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new Comment("X#: AL = ESI[0]");
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new Mov{ DestinationReg = RegistersEnum.AL, SourceReg = RegistersEnum.ESI, SourceIsIndirect = true, SourceDisplacement = 0 };
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new Comment("X#: if (AL = 0) goto AfterMsg");
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new Compare { DestinationReg = RegistersEnum.AL, SourceValue = 0 };
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new ConditionalJump { Condition = ConditionalTestEnum.Zero, DestinationLabel = "DebugStub_DisplayWaitMsg_AfterMsg" };
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new Comment("X#: ESI + 1");
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new INC { DestinationReg = RegistersEnum.ESI };
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new Comment("X#: EDI[0] = AL");
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new Mov{ DestinationReg = RegistersEnum.EDI, DestinationIsIndirect = true, DestinationDisplacement = 0, SourceReg = RegistersEnum.AL };
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new Comment("X#: EDI + 2");
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new Add { DestinationReg = RegistersEnum.EDI, SourceValue = 2 };
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new Comment("X#: Goto ReadChar");
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new Jump { DestinationLabel = "DebugStub_DisplayWaitMsg_ReadChar" };
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new Comment("X#: AfterMsg:");
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new Label("DebugStub_DisplayWaitMsg_AfterMsg");
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new Comment("X#: }");
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new Label("DebugStub_DisplayWaitMsg_Exit");
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new Return();
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}
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}
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}
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