private static uint internalAllocation(uint size, bool allign)
{
totalAllocations++;
tryAgain :;
uint returnable = 0;
if (Settings.HeapUseBasic || entryCount == 0)
{
if (heapPointer == 0)
{
heapPointer = Utils.allign4K(Multiboot.GetEndOfKernel()) + 4096;
}
if (allign)
{
heapPointer = Utils.allign4K(heapPointer) + 4096;
}
uint tmp = heapPointer;
heapPointer += size;
returnable = tmp;
goto allocationEnd;
}
mutex.Lock();
if (currentEntry >= entryCount)
{
currentEntry = 0;
}
var entry = directory->GetEntry(currentEntry);
if (entry->used)
{
currentEntry++;
goto tryAgain;
}
if (!allign && size < 4096)
{
if (entry->size <= size && entry->location != 0)
{
entry->used = true;
returnable = entry->location;
goto allocationEnd;
}
if (size > pageSpace)
{
pageSpace = 4096;
heapPointer = PageManager.GetFreePage();
if (heapPointer == 0)
{
// need to to a GC scan and free some pages
Console.WriteLine("RAN OUT OF RAM");
ACPI.Shutdown();
while (true)
{
}
}
}
pageSpace -= size;
entry->size = size;
entry->location = heapPointer;
heapPointer += size;
entry->used = true;
returnable = entry->location;
goto allocationEnd;
}
else
{
int num = (int)(size / 4096);
int remainder = (int)(size % 4096);
if (remainder > 0)
{
num++;
}
entry->used = true;
entry->location = PageManager.GetFreePage(num);
entry->size = (uint)num * 4096;
returnable = entry->location;
goto allocationEnd;
}
allocationEnd :;
Utils.memset((byte *)returnable, 0, size);
mutex.Unlock();
return(returnable);
}