my small contribution to MemoryBlock: build it on a tempfile instead of system pagefile. Couldnt test it because old gpgx.elf and don't know how to build?
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zeromus
parent
0e9a34a074
commit
30b71d5e44
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@ -150,40 +150,65 @@ namespace BizHawk.Emulation.Cores
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}
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/// <summary>
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/// allocate size bytes starting at a particular address
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/// Allocates a memory block as a memory-mapped file with the given size (created immediately) which can be Activated and Deactivated only at the given address.
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/// </summary>
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/// <param name="start"></param>
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/// <param name="size"></param>
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public MemoryBlock(ulong start, ulong size)
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{
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if (!Aligned(start))
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throw new ArgumentOutOfRangeException();
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if (size == 0)
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throw new ArgumentOutOfRangeException();
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size = AlignUp(size);
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_handle = Kernel32.CreateFileMapping(Kernel32.INVALID_HANDLE_VALUE, IntPtr.Zero,
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Kernel32.FileMapProtection.PageExecuteReadWrite | Kernel32.FileMapProtection.SectionCommit, (uint)(size >> 32), (uint)size, null);
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if (_handle == IntPtr.Zero)
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throw new InvalidOperationException("CreateFileMapping() returned NULL");
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Start = start;
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End = start + size;
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Size = size;
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_pageData = new Protection[GetPage(End - 1) + 1];
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/// <param name="start">Location where this block can be Activated</param>
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/// <param name="size">Size of the block</param>
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public MemoryBlock(ulong start, ulong size)
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{
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size = 8 * 1024 * 1024 * 1024L;
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if (!Aligned(start))
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throw new ArgumentOutOfRangeException();
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if (size == 0)
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throw new ArgumentOutOfRangeException();
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size = AlignUp(size);
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//create a temporary file--the alternative is using the system pagefile(s)
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//some systems have disabled or too-small files and many systems have a few GBs pagefile and difficulty growing it.
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//creating a tempfile subverts the user's choice of pagefile locations, but %temp%'s location should be similarly chosen
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//Could use this as a fallback in case creation on the pagefile fails?
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var fname = BizHawk.Common.TempFileCleaner.GetTempFilename("MemoryBlock",null,false);
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IntPtr fhTemp = Kernel32.CreateFile(
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fname,
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unchecked((int)(0x80000000 | 0x40000000 | 0x20000000)), //+RWX (protections can later be added with finer granularity)
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3, //share RW
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IntPtr.Zero, //security stuff
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2, //create always
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0x04000000, //delete on close!
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IntPtr.Zero //template
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);
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//create FileMapping around the tempfile
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//(again, protections can later be added with finer granularity)
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_handle = Kernel32.CreateFileMapping(fhTemp, IntPtr.Zero,
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Kernel32.FileMapProtection.PageExecuteReadWrite | Kernel32.FileMapProtection.SectionCommit, (uint)(size >> 32), (uint)size, null);
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//releasing our tempfile handle, essentially yielding the handle to the FileMapping as sole owner
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new Microsoft.Win32.SafeHandles.SafeFileHandle(fhTemp, true).Dispose();
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if (_handle == IntPtr.Zero)
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throw new InvalidOperationException("CreateFileMapping() returned NULL");
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Start = start;
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End = start + size;
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Size = size;
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_pageData = new Protection[GetPage(End - 1) + 1];
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}
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/// <summary>
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/// activate the memory block, swapping it in at the specified address
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/// activate the memory block, swapping it in at the predefined address
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/// </summary>
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public void Activate()
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{
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if (Active)
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throw new InvalidOperationException("Already active");
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if (Kernel32.MapViewOfFileEx(_handle, Kernel32.FileMapAccessType.Read | Kernel32.FileMapAccessType.Write | Kernel32.FileMapAccessType.Execute,
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0, 0, Z.UU(Size), Z.US(Start)) != Z.US(Start))
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throw new InvalidOperationException("Already active");
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//(again, protections can later be added with finer granularity)
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IntPtr ptr = Kernel32.MapViewOfFileEx(_handle, Kernel32.FileMapAccessType.Read | Kernel32.FileMapAccessType.Write | Kernel32.FileMapAccessType.Execute,
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0, 0, Z.UU(Size), Z.US(Start));
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if (ptr != Z.US(Start))
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{
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throw new InvalidOperationException("MapViewOfFileEx() returned NULL");
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throw new InvalidOperationException("MapViewOfFileEx() returned incorrect starting address");
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}
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ProtectAll();
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Active = true;
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@ -197,7 +222,7 @@ namespace BizHawk.Emulation.Cores
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if (!Active)
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throw new InvalidOperationException("Not active");
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if (!Kernel32.UnmapViewOfFile(Z.US(Start)))
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throw new InvalidOperationException("UnmapViewOfFile() returned NULL");
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throw new InvalidOperationException("UnmapViewOfFile() returned false");
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}
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/// <summary>
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@ -438,7 +463,18 @@ namespace BizHawk.Emulation.Cores
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GUARD_Modifierflag = 0x100,
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NOCACHE_Modifierflag = 0x200,
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WRITECOMBINE_Modifierflag = 0x400
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}
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}
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[DllImport("kernel32.dll", CharSet = CharSet.Auto, SetLastError = true)]
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public static extern IntPtr CreateFile(
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string fileName,
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int desiredAccess,
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int shareMode,
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IntPtr securityAttributes,
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int creationDisposition,
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int flagsAndAttributes,
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IntPtr templateFile);
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[DllImport("kernel32.dll", SetLastError = true)]
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public static extern IntPtr CreateFileMapping(
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