Restructured and rewritten entire codebase

include/memory/stack.hpp

@@ -0,0 +1,114 @@
+/*
+	This file is part of Fennix Kernel.
+
+	Fennix Kernel is free software: you can redistribute it and/or
+	modify it under the terms of the GNU General Public License as
+	published by the Free Software Foundation, either version 3 of
+	the License, or (at your option) any later version.
+
+	Fennix Kernel is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+	GNU General Public License for more details.
+
+	You should have received a copy of the GNU General Public License
+	along with Fennix Kernel. If not, see <https://www.gnu.org/licenses/>.
+*/
+
+#ifndef __FENNIX_KERNEL_MEMORY_STACK_GUARD_H__
+#define __FENNIX_KERNEL_MEMORY_STACK_GUARD_H__
+
+#include <types.h>
+#include <vector>
+
+#include <memory/table.hpp>
+
+namespace Memory
+{
+	class StackGuard
+	{
+	private:
+		struct AllocatedPages
+		{
+			void *PhysicalAddress;
+			void *VirtualAddress;
+		};
+
+		void *StackBottom = nullptr;
+		void *StackTop = nullptr;
+		void *StackPhysicalBottom = nullptr;
+		void *StackPhysicalTop = nullptr;
+		uint64_t Size = 0;
+		bool UserMode = false;
+		bool Expanded = false;
+		VirtualMemoryArea *vma = nullptr;
+		std::vector<AllocatedPages> AllocatedPagesList;
+
+	public:
+		std::vector<AllocatedPages> GetAllocatedPages()
+		{
+			return AllocatedPagesList;
+		}
+
+		/** Fork stack guard */
+		void Fork(StackGuard *Parent);
+
+		/** For general info */
+		uint64_t GetSize() { return Size; }
+
+		/** For general info */
+		bool GetUserMode() { return UserMode; }
+
+		/** For general info */
+		bool IsExpanded() { return Expanded; }
+
+		/** For general info */
+		void *GetStackBottom() { return StackBottom; }
+
+		/** For RSP */
+		void *GetStackTop() { return StackTop; }
+
+		/**
+		 * For general info (avoid if possible)
+		 *
+		 * @note This can be used only if the
+		 * stack was NOT expanded.
+		 */
+		void *GetStackPhysicalBottom()
+		{
+			if (Expanded)
+				return nullptr;
+			return StackPhysicalBottom;
+		}
+
+		/**
+		 * For general info (avoid if possible)
+		 *
+		 * @note This can be used only if the
+		 * stack was NOT expanded.
+		 */
+		void *GetStackPhysicalTop()
+		{
+			if (Expanded)
+				return nullptr;
+			return StackPhysicalTop;
+		}
+
+		/**
+		 * Called by exception handler */
+		bool Expand(uintptr_t FaultAddress);
+
+		/**
+		 * Construct a new Stack Guard object
+		 * @param User Stack for user mode?
+		 */
+		StackGuard(bool User, VirtualMemoryArea *vma);
+
+		/**
+		 * Destroy the Stack Guard object
+		 */
+		~StackGuard();
+	};
+}
+
+#endif // !__FENNIX_KERNEL_MEMORY_STACK_GUARD_H__