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using Ryujinx.Memory;
using System;
namespace Ryujinx.Cpu
{
public class AddressSpace : IDisposable
{
private readonly MemoryBlock _backingMemory;
public MemoryBlock Base { get; }
public MemoryBlock Mirror { get; }
public ulong AddressSpaceSize { get; }
public AddressSpace(MemoryBlock backingMemory, MemoryBlock baseMemory, MemoryBlock mirrorMemory, ulong addressSpaceSize)
{
_backingMemory = backingMemory;
Base = baseMemory;
Mirror = mirrorMemory;
AddressSpaceSize = addressSpaceSize;
}
public static bool TryCreate(MemoryBlock backingMemory, ulong asSize, out AddressSpace addressSpace)
{
addressSpace = null;
const MemoryAllocationFlags AsFlags = MemoryAllocationFlags.Reserve | MemoryAllocationFlags.ViewCompatible;
ulong minAddressSpaceSize = Math.Min(asSize, 1UL << 36);
// Attempt to create the address space with expected size or try to reduce it until it succeed.
for (ulong addressSpaceSize = asSize; addressSpaceSize >= minAddressSpaceSize; addressSpaceSize >>= 1)
{
MemoryBlock baseMemory = null;
MemoryBlock mirrorMemory = null;
try
{
baseMemory = new MemoryBlock(addressSpaceSize, AsFlags);
mirrorMemory = new MemoryBlock(addressSpaceSize, AsFlags);
addressSpace = new AddressSpace(backingMemory, baseMemory, mirrorMemory, addressSpaceSize);
break;
}
catch (SystemException)
{
baseMemory?.Dispose();
mirrorMemory?.Dispose();
}
}
return addressSpace != null;
}
public void Map(ulong va, ulong pa, ulong size, MemoryMapFlags flags)
{
Base.MapView(_backingMemory, pa, va, size);
Mirror.MapView(_backingMemory, pa, va, size);
}
public void Unmap(ulong va, ulong size)
{
Base.UnmapView(_backingMemory, va, size);
Mirror.UnmapView(_backingMemory, va, size);
}
public void Dispose()
{
GC.SuppressFinalize(this);
Base.Dispose();
Mirror.Dispose();
}
}
}
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