Initial commit

src/graphics/host_gpu/pageManager.h

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+#ifndef EMULATOR_SRC_GRAPHICS_HOST_GPU_PAGEMANAGER_H_
+#define EMULATOR_SRC_GRAPHICS_HOST_GPU_PAGEMANAGER_H_
+
+#include "common/common.h"
+
+#include <memory>
+
+namespace Libs::Graphics {
+
+enum class PageFaultAccess { Read, Write, Execute, Unknown };
+enum class PageFaultPhase { Invalidate, Complete, Release };
+enum class PageWatchMode { Write, ReadWrite };
+enum class GpuAccess { Read, Write, ReadWrite };
+
+using PageFaultHandler = bool (*)(void* context, PageFaultAccess access, uint64_t vaddr,
+                                  uint64_t size, PageFaultPhase phase) noexcept;
+
+class PageManager final {
+public:
+	class BackingWrite final {
+	public:
+		BackingWrite(PageManager& manager, uint64_t vaddr, uint64_t size) noexcept;
+		~BackingWrite();
+		KYTY_CLASS_NO_COPY(BackingWrite);
+
+	private:
+		PageManager& m_manager;
+		uint64_t     m_vaddr = 0;
+		uint64_t     m_size  = 0;
+	};
+
+	PageManager(PageFaultHandler fault_handler, void* fault_context);
+	// The owner must stop all PageManager callers before destruction.
+	~PageManager();
+
+	KYTY_CLASS_NO_COPY(PageManager);
+
+	[[nodiscard]] uint64_t GetPageSize() const;
+	[[nodiscard]] bool     IsTracked(uint64_t vaddr) const noexcept;
+	[[nodiscard]] bool     IsMapped(uint64_t vaddr, uint64_t size) const noexcept;
+	[[nodiscard]] bool HasGpuAccess(uint64_t vaddr, uint64_t size, GpuAccess access) const noexcept;
+
+	void UpdatePageWatchers(bool track, uint64_t vaddr, uint64_t size,
+	                        PageWatchMode mode = PageWatchMode::Write);
+	void OnGpuMap(uint64_t vaddr, uint64_t size, GpuAccess access = GpuAccess::ReadWrite);
+	void OnGpuUnmap(uint64_t vaddr, uint64_t size, GpuAccess access = GpuAccess::ReadWrite);
+
+	[[nodiscard]] bool HandleFault(PageFaultAccess access, uint64_t fault_vaddr) noexcept;
+
+private:
+	void BeginBackingWrite(uint64_t vaddr, uint64_t size) noexcept;
+	void EndBackingWrite(uint64_t vaddr, uint64_t size) noexcept;
+
+	struct Impl;
+	std::unique_ptr<Impl> m_impl;
+};
+
+} // namespace Libs::Graphics
+
+#endif // EMULATOR_SRC_GRAPHICS_HOST_GPU_PAGEMANAGER_H_