105 lines
2.6 KiB
C#
105 lines
2.6 KiB
C#
namespace BizHawk.Emulation.Common
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{
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/// <summary>
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/// A memory region and the functionality to read/write from it
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/// as required by the IMemoryDomains service.
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/// </summary>
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/// <seealso cref="IMemoryDomains" />
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public abstract class MemoryDomain
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{
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public enum Endian
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{
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Big, Little, Unknown
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}
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public string Name { get; protected set; }
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public long Size { get; protected set; }
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public int WordSize { get; protected set; }
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public Endian EndianType { get; protected set; }
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public bool Writable { get; protected set; }
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public abstract byte PeekByte(long addr);
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public abstract void PokeByte(long addr, byte val);
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public override string ToString()
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{
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return Name;
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}
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public virtual ushort PeekUshort(long addr, bool bigEndian)
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{
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Endian endian = bigEndian ? Endian.Big : Endian.Little;
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switch (endian)
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{
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default:
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case Endian.Big:
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return (ushort)((PeekByte(addr) << 8) | PeekByte(addr + 1));
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case Endian.Little:
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return (ushort)(PeekByte(addr) | (PeekByte(addr + 1) << 8));
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}
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}
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public virtual uint PeekUint(long addr, bool bigEndian)
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{
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Endian endian = bigEndian ? Endian.Big : Endian.Little;
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switch (endian)
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{
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default:
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case Endian.Big:
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return (uint)((PeekByte(addr) << 24)
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| (PeekByte(addr + 1) << 16)
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| (PeekByte(addr + 2) << 8)
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| (PeekByte(addr + 3) << 0));
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case Endian.Little:
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return (uint)((PeekByte(addr) << 0)
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| (PeekByte(addr + 1) << 8)
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| (PeekByte(addr + 2) << 16)
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| (PeekByte(addr + 3) << 24));
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}
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}
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public virtual void PokeUshort(long addr, ushort val, bool bigEndian)
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{
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Endian endian = bigEndian ? Endian.Big : Endian.Little;
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switch (endian)
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{
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default:
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case Endian.Big:
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PokeByte(addr + 0, (byte)(val >> 8));
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PokeByte(addr + 1, (byte)val);
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break;
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case Endian.Little:
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PokeByte(addr + 0, (byte)val);
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PokeByte(addr + 1, (byte)(val >> 8));
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break;
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}
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}
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public virtual void PokeUint(long addr, uint val, bool bigEndian)
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{
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Endian endian = bigEndian ? Endian.Big : Endian.Little;
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switch (endian)
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{
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default:
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case Endian.Big:
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PokeByte(addr + 0, (byte)(val >> 24));
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PokeByte(addr + 1, (byte)(val >> 16));
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PokeByte(addr + 2, (byte)(val >> 8));
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PokeByte(addr + 3, (byte)val);
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break;
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case Endian.Little:
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PokeByte(addr + 0, (byte)val);
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PokeByte(addr + 1, (byte)(val >> 8));
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PokeByte(addr + 2, (byte)(val >> 16));
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PokeByte(addr + 3, (byte)(val >> 24));
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break;
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}
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}
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}
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}
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