From 2f0418c10134b4c8e5ae47ace623b5db57c0435c Mon Sep 17 00:00:00 2001
From: Fernando Sahmkow <fsahmkow27@gmail.com>
Date: Thu, 21 Dec 2023 00:04:03 +0100
Subject: Core: Initial implementation of device memory mapping

---
 src/core/device_memory_manager.h | 97 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 97 insertions(+)
 create mode 100644 src/core/device_memory_manager.h

(limited to 'src/core/device_memory_manager.h')

diff --git a/src/core/device_memory_manager.h b/src/core/device_memory_manager.h
new file mode 100644
index 000000000..0861b792d
--- /dev/null
+++ b/src/core/device_memory_manager.h
@@ -0,0 +1,97 @@
+// SPDX-FileCopyrightText: Copyright 2023 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include <deque>
+#include <memory>
+
+#include "common/common_types.h"
+#include "common/virtual_buffer.h"
+
+namespace Core {
+
+class DeviceMemory;
+
+namespace Memory {
+class Memory;
+}
+
+template <typename DTraits>
+struct DeviceMemoryManagerAllocator;
+
+template <typename Traits>
+class DeviceMemoryManager {
+    using DeviceInterface = typename Traits::DeviceInterface;
+
+public:
+    DeviceMemoryManager(const DeviceMemory& device_memory);
+    ~DeviceMemoryManager();
+
+    void BindInterface(DeviceInterface* interface);
+
+    DAddr Allocate(size_t size);
+    void AllocateFixed(DAddr start, size_t size);
+    DAddr AllocatePinned(size_t size);
+    void Free(DAddr start, size_t size);
+
+    void Map(DAddr address, VAddr virtual_address, size_t size, size_t p_id);
+    void Unmap(DAddr address, size_t size);
+
+    // Write / Read
+    template <typename T>
+    T* GetPointer(DAddr address);
+
+    template <typename T>
+    const T* GetPointer(DAddr address) const;
+
+    template <typename T>
+    void Write(DAddr address, T value);
+
+    template <typename T>
+    T Read(DAddr address) const;
+
+    void ReadBlock(DAddr address, void* dest_pointer, size_t size);
+    void WriteBlock(DAddr address, void* src_pointer, size_t size);
+
+    size_t RegisterProcess(Memory::Memory* memory);
+    void UnregisterProcess(size_t id);
+
+private:
+    static constexpr bool supports_pinning = Traits::supports_pinning;
+    static constexpr size_t device_virtual_bits = Traits::device_virtual_bits;
+    static constexpr size_t device_as_size = 1ULL << device_virtual_bits;
+    static constexpr size_t physical_max_bits = 33;
+    static constexpr size_t page_bits = 12;
+    static constexpr u32 physical_address_base = 1U << page_bits;
+
+    template <typename T>
+    T* GetPointerFromRaw(PAddr addr) {
+        return reinterpret_cast<T*>(physical_base + addr);
+    }
+
+    template <typename T>
+    const T* GetPointerFromRaw(PAddr addr) const {
+        return reinterpret_cast<T*>(physical_base + addr);
+    }
+
+    template <typename T>
+    PAddr GetRawPhysicalAddr(const T* ptr) const {
+        return static_cast<PAddr>(reinterpret_cast<uintptr_t>(ptr) - physical_base);
+    }
+
+    void WalkBlock(const DAddr addr, const std::size_t size, auto on_unmapped, auto on_memory,
+                   auto increment);
+
+    std::unique_ptr<DeviceMemoryManagerAllocator<Traits>> impl;
+
+    const uintptr_t physical_base;
+    DeviceInterface* interface;
+    Common::VirtualBuffer<u32> compressed_physical_ptr;
+    Common::VirtualBuffer<u32> compressed_device_addr;
+
+    std::deque<size_t> id_pool;
+    std::deque<Memory::Memory*> registered_processes;
+};
+
+} // namespace Core
\ No newline at end of file
-- 
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