Add TSS deserialiser.

InstructionSets/x86/Implementation/FlowControl.hpp

@@ -10,6 +10,7 @@
 
 #include "Resolver.hpp"
 #include "Stack.hpp"
+#include "InstructionSets/x86/TaskStateSegment.hpp"
 #include "InstructionSets/x86/AccessType.hpp"
 
 #include <type_traits>

InstructionSets/x86/TaskStateSegment.hpp

@@ -0,0 +1,79 @@
+//
+//  TaskStateSegment.hpp
+//  Clock Signal
+//
+//  Created by Thomas Harte on 20/05/2025.
+//  Copyright © 2025 Thomas Harte. All rights reserved.
+//
+
+#pragma once
+
+#include "Mode.hpp"
+
+namespace InstructionSet::x86 {
+
+template <Mode mode>
+struct TaskStateSegment;
+
+template <>
+struct TaskStateSegment<Mode::Protected286> {
+	static constexpr uint32_t Size = 44;
+
+	template <typename LinearMemoryT>
+	static TaskStateSegment read(LinearMemoryT &memory, const uint32_t base, const uint32_t limit) {
+		uint32_t c = 0;
+		const auto read = [&]() {
+			const auto value = memory.template access<uint16_t, AccessType::Read>(base + c, limit);
+			c += 2;
+			return value;
+		};
+
+		TaskStateSegment result;
+		result.back_link = read();
+		result.stacks[0].offset = read();
+		result.stacks[0].segment = read();
+		result.stacks[1].offset = read();
+		result.stacks[1].segment = read();
+		result.stacks[2].offset = read();
+		result.stacks[2].segment = read();
+		result.instruction_pointer = read();
+		result.flags = read();
+
+		result.ax = read();
+		result.cx = read();
+		result.dx = read();
+		result.bx = read();
+
+		result.sp = read();
+		result.bp = read();
+		result.si = read();
+		result.di = read();
+
+		result.es_selector = read();
+		result.cs_selector = read();
+		result.ss_selector = read();
+		result.ds_selector = read();
+
+		result.ldt_selector = read();
+
+		return result;
+	}
+
+	uint16_t back_link;
+	struct StackPointer {
+		uint16_t offset;
+		uint16_t segment;
+	};
+	StackPointer stacks[3];	// Indexed by CPL.
+	uint16_t instruction_pointer;
+	uint16_t flags;
+	uint16_t ax, cx, dx, bx;
+	uint16_t sp, bp, si, di;
+	uint16_t es_selector;
+	uint16_t cs_selector;
+	uint16_t ss_selector;
+	uint16_t ds_selector;
+	uint16_t ldt_selector;
+};
+
+}

OSBindings/Mac/Clock Signal.xcodeproj/project.pbxproj

@@ -1472,6 +1472,7 @@
 		4B228CDA24DA41880077EF25 /* ScanTarget.metal */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.metal; path = ScanTarget.metal; sourceTree = "<group>"; xcLanguageSpecificationIdentifier = xcode.lang.metal; };
 		4B24095A1C45DF85004DA684 /* Stepper.hpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.h; path = Stepper.hpp; sourceTree = "<group>"; };
 		4B2530F3244E6773007980BF /* fm.json */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text.json; path = fm.json; sourceTree = "<group>"; };
+		4B25BC1E2DDD64AA002044CA /* TaskStateSegment.hpp */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.cpp.h; path = TaskStateSegment.hpp; sourceTree = "<group>"; };
 		4B262BFF29691F55002EC0F7 /* PersonalityTraits.hpp */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.cpp.h; path = PersonalityTraits.hpp; sourceTree = "<group>"; };
 		4B2A1CD92BA775C5004496CE /* I2C.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = I2C.cpp; sourceTree = "<group>"; };
 		4B2A1CDA2BA775C5004496CE /* I2C.hpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.h; path = I2C.hpp; sourceTree = "<group>"; };
@@ -5376,6 +5377,7 @@
 				4B8671EB2D8FABA0009E1610 /* Mode.hpp */,
 				4BE3C69527CBC540000EAD28 /* Model.hpp */,
 				42437B352ACF0AA2006DFED1 /* Perform.hpp */,
+				4B25BC1E2DDD64AA002044CA /* TaskStateSegment.hpp */,
 				42437B372ACF2798006DFED1 /* Implementation */,
 			);
 			path = x86;