core: device_manager: Add a simple class to manage device RAM.

src/core/device_memory.h

@@ -0,0 +1,48 @@
+// Copyright 2020 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include "common/assert.h"
+#include "common/common_funcs.h"
+#include "core/hle/kernel/physical_memory.h"
+
+namespace Core {
+
+class System;
+
+namespace DramMemoryMap {
+constexpr u64 Base = 0x80000000ULL;
+constexpr u64 Size = 0x100000000ULL;
+constexpr u64 End = Base + Size;
+constexpr u64 KernelReserveBase = Base + 0x60000;
+constexpr u64 SlabHeapBase = KernelReserveBase + 0x85000;
+constexpr u64 SlapHeapSize = 0xa21000;
+constexpr u64 SlabHeapEnd = SlabHeapBase + SlapHeapSize;
+}; // namespace DramMemoryMap
+
+class DeviceMemory : NonCopyable {
+public:
+    DeviceMemory(Core::System& system);
+    ~DeviceMemory();
+
+    template <typename T>
+    PAddr GetPhysicalAddr(T* ptr) {
+        const auto ptr_addr{reinterpret_cast<uintptr_t>(ptr)};
+        const auto base_addr{reinterpret_cast<uintptr_t>(base)};
+        ASSERT(ptr_addr >= base_addr);
+        return ptr_addr - base_addr + DramMemoryMap::Base;
+    }
+
+    PAddr GetPhysicalAddr(VAddr addr);
+
+    u8* GetPointer(PAddr addr);
+
+private:
+    u8* base{};
+    Kernel::PhysicalMemory physical_memory;
+    Core::System& system;
+};
+
+} // namespace Core