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-rw-r--r--src/common/host_memory.h62
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diff --git a/src/common/host_memory.h b/src/common/host_memory.h
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+// Copyright 2019 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <memory>
+#include "common/common_types.h"
+
+namespace Common {
+
+/**
+ * A low level linear memory buffer, which supports multiple mappings
+ * Its purpose is to rebuild a given sparse memory layout, including mirrors.
+ */
+class HostMemory {
+public:
+ explicit HostMemory(size_t backing_size, size_t virtual_size);
+ ~HostMemory();
+
+ /**
+ * Copy constructors. They shall return a copy of the buffer without the mappings.
+ * TODO: Implement them with COW if needed.
+ */
+ HostMemory(const HostMemory& other) = delete;
+ HostMemory& operator=(const HostMemory& other) = delete;
+
+ /**
+ * Move constructors. They will move the buffer and the mappings to the new object.
+ */
+ HostMemory(HostMemory&& other) noexcept;
+ HostMemory& operator=(HostMemory&& other) noexcept;
+
+ void Map(size_t virtual_offset, size_t host_offset, size_t length);
+
+ void Unmap(size_t virtual_offset, size_t length);
+
+ void Protect(size_t virtual_offset, size_t length, bool read, bool write);
+
+ [[nodiscard]] u8* BackingBasePointer() noexcept {
+ return backing_base;
+ }
+ [[nodiscard]] const u8* BackingBasePointer() const noexcept {
+ return backing_base;
+ }
+
+ [[nodiscard]] u8* VirtualBasePointer() noexcept {
+ return virtual_base;
+ }
+ [[nodiscard]] const u8* VirtualBasePointer() const noexcept {
+ return virtual_base;
+ }
+
+private:
+ // Low level handler for the platform dependent memory routines
+ class Impl;
+ std::unique_ptr<Impl> impl;
+ u8* backing_base{};
+ u8* virtual_base{};
+};
+
+} // namespace Common