MGA: More Mystique busmastering fixes#3914
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* Use mutex locking when reporting SOFTRAPEN * IEN register now correctly returns values it currently holds * Restore VLINEPEN interrupt
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Summary
MGA: More Mystique busmastering fixes
Use mutex locking when reporting SOFTRAPENNT 4.0's OpenGL screensavers now can render around 20-40 frames before freezing.Edit: 3D busmastering now works, but it is slow.
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