ushort AllocHandle(ushort growSize)
{
// Do we have any free handles?
if (_freeHandles.Count == 0)
{
// No, allocate a fixed block of memory for the handles
// Each handle in the block points to the actual location of the allocation elsewhere in the heap
int handlesPerBlock = 32;
// Allocate range
var r = _allocator.Alloc(handlesPerBlock * 2, false, true);
if (r == null)
{
GrowHeap(handlesPerBlock * 2 + growSize + 1024);
r = _allocator.Alloc(handlesPerBlock * 2, false, true);
if (r == null)
{
return(0);
}
}
r.User = new LocalAllocation()
{
flags = Win16.LMEM_FIXED,
handleOrPtr = 0,
range = r,
};
// Create handles
for (int i = 0; i < handlesPerBlock; i++)
{
_freeHandles.Add((ushort)(r.Position + i * 2));
}
}
// Remove from list
ushort handle = _freeHandles[0];
_freeHandles.RemoveAt(0);
return(handle);
}
public Selector AllocSelector(string name, ushort pages = 1)
{
// Create the allocation entry
var sel = new Selector()
{
name = name,
};
// Multi segment
sel.selectorIndex = (ushort)(_selectorAllocator.Alloc(pages, false, false).Position);
// Update the high memory page map for all selectors
for (int i = 0; i < pages; i++)
{
_pageMap[(sel.selectorIndex + i)] = sel;
}
if (_machine.logGlobalAllocations)
{
Log.WriteLine("Allocated selector: 0x{0:X4} ({1} pages)", sel.selector, pages);
}
return(sel);
}
public LocalHeap(GlobalHeap globalHeap, ushort globalHandle, ushort baseOffset, ushort maxSize)
{
_globalHeap = globalHeap;
_globalHandle = globalHandle;
// Dont allocate at zero
if (baseOffset == 0)
{
baseOffset = 16;
}
// Work out top of heap
uint topOfHeap = _globalHeap.Size(globalHandle);
uint heapLimit = baseOffset + (uint)(maxSize == 0 ? 0x10000 : maxSize);
if (heapLimit > topOfHeap)
{
heapLimit = topOfHeap;
}
_allocator = new RangeAllocator <LocalAllocation>((int)heapLimit);
_freeHandles = new List <ushort>();
_handleOrPtrMap = new Dictionary <ushort, LocalAllocation>();
var reservedPage = _allocator.Alloc(baseOffset, false, false);
reservedPage.User = new LocalAllocation()
{
flags = Win16.LMEM_FIXED,
handleOrPtr = 0,
range = reservedPage,
};
_allocator.MoveListener = this;
_baseOffset = baseOffset;
}
