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using System;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;
namespace Ryujinx.Graphics.Gpu.Memory
{
/// <summary>
/// Represents physical memory, accessible from the GPU.
/// This is actually working CPU virtual addresses, of memory mapped on the application process.
/// </summary>
class PhysicalMemory
{
public const int PageSize = Cpu.MemoryManager.PageSize;
private readonly Cpu.MemoryManager _cpuMemory;
/// <summary>
/// Creates a new instance of the physical memory.
/// </summary>
/// <param name="cpuMemory">CPU memory manager of the application process</param>
public PhysicalMemory(Cpu.MemoryManager cpuMemory)
{
_cpuMemory = cpuMemory;
}
/// <summary>
/// Gets a span of data from the application process.
/// </summary>
/// <param name="address">Start address of the range</param>
/// <param name="size">Size in bytes to be range</param>
/// <returns>A read only span of the data at the specified memory location</returns>
public ReadOnlySpan<byte> GetSpan(ulong address, int size)
{
return _cpuMemory.GetSpan(address, size);
}
/// <summary>
/// Reads data from the application process.
/// </summary>
/// <typeparam name="T">Type of the structure</typeparam>
/// <param name="gpuVa">Address to read from</param>
/// <returns>The data at the specified memory location</returns>
public T Read<T>(ulong address) where T : unmanaged
{
return MemoryMarshal.Cast<byte, T>(GetSpan(address, Unsafe.SizeOf<T>()))[0];
}
/// <summary>
/// Writes data to the application process.
/// </summary>
/// <param name="address">Address to write into</param>
/// <param name="data">Data to be written</param>
public void Write(ulong address, ReadOnlySpan<byte> data)
{
_cpuMemory.Write(address, data);
}
/// <summary>
/// Checks if a specified virtual memory region has been modified by the CPU since the last call.
/// </summary>
/// <param name="address">CPU virtual address of the region</param>
/// <param name="size">Size of the region</param>
/// <param name="name">Resource name</param>
/// <param name="modifiedRanges">Optional array where the modified ranges should be written</param>
/// <returns>The number of modified ranges</returns>
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public int QueryModified(ulong address, ulong size, ResourceName name, (ulong, ulong)[] modifiedRanges = null)
{
return _cpuMemory.QueryModified(address, size, (int)name, modifiedRanges);
}
}
}
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