/// <summary>
/// Init heap.
/// </summary>
/// <exception cref="Exception">Thrown on fatal error, contact support.</exception>
public static unsafe void Init()
{
StackStart = (uint *)CPU.GetStackStart();
HeapSmall.Init();
HeapMedium.Init();
HeapLarge.Init();
}
/// <summary>
/// Alloc memory block, of a given size.
/// </summary>
/// <param name="aSize">A size of block to alloc, in bytes.</param>
/// <returns>Byte pointer to the start of the block.</returns>
public static byte *Alloc(Native aSize)
{
if (aSize <= HeapSmall.mMaxItemSize)
{
return(HeapSmall.Alloc(aSize));
}
else if (aSize <= HeapMedium.MaxItemSize)
{
return(HeapMedium.Alloc(aSize));
}
else
{
return(HeapLarge.Alloc(aSize));
}
}
// Keep as void* and not byte* or other. Reduces typecasting from callers
// who may have typed the pointer to their own needs.
/// <summary>
/// Free a heap item.
/// </summary>
/// <param name="aPtr">A pointer to the heap item to be freed.</param>
/// <exception cref="Exception">Thrown if:
/// <list type="bullet">
/// <item>Page type is not found.</item>
/// <item>Heap item not found in RAT.</item>
/// </list>
/// </exception>
public static void Free(void *aPtr)
{
//TODO find a better way to remove the double look up here for GetPageType and then again in the
// .Free methods which actually free the entries in the RAT.
//Debugger.DoSendNumber(0x77);
//Debugger.DoSendNumber((uint)aPtr);
var xType = RAT.GetPageType(aPtr);
switch (xType)
{
case RAT.PageType.HeapSmall:
HeapSmall.Free(aPtr);
break;
case RAT.PageType.HeapMedium:
case RAT.PageType.HeapLarge:
HeapLarge.Free(aPtr);
break;
default:
throw new Exception("Heap item not found in RAT.");
}
}
/// <summary>
/// Alloc memory block, of a given size.
/// </summary>
/// <param name="aSize">A size of block to alloc, in bytes.</param>
/// <returns>Byte pointer to the start of the block.</returns>
public static byte *Alloc(uint aSize)
{
CPU.DisableInterrupts();
if (aSize <= HeapSmall.mMaxItemSize)
{
byte *ptr = HeapSmall.Alloc((ushort)aSize);
CPU.EnableInterrupts();
return(ptr);
}
else if (aSize <= HeapMedium.MaxItemSize)
{
byte *ptr = HeapMedium.Alloc(aSize);
CPU.EnableInterrupts();
return(ptr);
}
else
{
byte *ptr = HeapLarge.Alloc(aSize);
CPU.EnableInterrupts();
return(ptr);
}
}
/// <summary>
/// Init heap.
/// </summary>
/// <exception cref="Exception">Thrown on fatal error, contact support.</exception>
public static void Init()
{
HeapSmall.Init();
HeapMedium.Init();
HeapLarge.Init();
}