//
// This is called to allocate memory for a stack, either an initial stack
// or a dynamically allocated stack chunk.
//
internal static UIntPtr StackAllocate(UIntPtr numPages, Process process,
uint extra, bool kernelAllocation, bool initialStack)
{
UIntPtr result = UIntPtr.Zero;
if (useAddressTranslation)
{
if (KernelRangeWrapper != null)
{
result = KernelRangeWrapper.Allocate(numPages, process, extra, PageType.Stack);
}
else
{
// Very early in the initialization sequence; ASSUME there is not
// yet any concurrent access to paging descriptors, and allocate
// memory without a paging-descriptor lock.
result = KernelRange.Allocate(numPages, process, extra, PageType.Stack, null);
}
}
else
{
result = FlatPages.StackAllocate(BytesFromPages(numPages),
UIntPtr.Zero,
MemoryManager.PageSize,
process, extra, kernelAllocation, initialStack);
}
if (kernelAllocation && result == UIntPtr.Zero)
{
DebugStub.WriteLine("******** Kernel OOM on Stack ********");
//
// Our kernel runtime can not handle this right now, so rather than
// return a null which will show up as a cryptic lab failure, always
// drop to the debugger.
//
// Note: Reservations should avoid this, so this is an indication that
// something has gone wrong in our reservation policy and estimates
// of kernel stack usage.
//
DebugStub.Break();
}
return(result);
}
internal unsafe UIntPtr Allocate(UIntPtr numPages, Process process,
uint extra, PageType type)
{
CheckAddressSpace();
if (indirect)
{
return(pRange->Allocate(numPages, process, extra, type,
parentDomain));
}
else
{
return(range.Allocate(numPages, process, extra, type,
parentDomain));
}
}
