internal static bool QueryMemory(UIntPtr queryAddr,
out UIntPtr regionAddr,
out UIntPtr regionSize)
{
#if SINGULARITY_KERNEL
PageType type = Sing_MemoryManager.KernelQuery(
queryAddr, out regionAddr, out regionSize);
return(type != PageType.Unknown);
#elif SINGULARITY_PROCESS
return(PageTableService.Query(queryAddr, out regionAddr, out regionSize));
#endif
}
internal static void FreeMemory(UIntPtr startAddr, UIntPtr size)
{
#if SINGULARITY_KERNEL
DebugStub.Assert(Sing_MemoryManager.IsPageAligned(size));
Sing_MemoryManager.KernelFree(
startAddr, Sing_MemoryManager.PagesFromBytes(size),
Process.kernelProcess);
#elif SINGULARITY_PROCESS
VTable.Assert((size & PageTable.PageMask) == 0);
PageTableService.Free(startAddr, size);
#endif
}
//////////////////////////////////// Allocation and Free Routines.
//
// Allocation is optimized for the case where an allocation starts
// with a relatively small amount of memory and grows over time.
// This is exactly the behavior exhibited by stacks and GC heaps.
//
// The allocation strategy also works well for large initial
// allocations. The strategy would be very inefficient if a very
// large number of small, completely independent allocations are
// made.
//
// AllocateMemory(size) performs an initial allocation.
// AllocateMemory(startAddr, size) performs growing allocations.
//
internal static unsafe UIntPtr AllocateMemory(UIntPtr size)
{
VTable.Assert(PageTable.PageAligned(size));
#if SINGULARITY_KERNEL
UIntPtr addr = Sing_MemoryManager.KernelAllocate(
Sing_MemoryManager.PagesFromBytes(size),
Process.kernelProcess, 0, PageType.Unknown);
#elif SINGULARITY_PROCESS
UIntPtr addr = PageTableService.Allocate(size);
#endif
#if SINGULARITY_KERNEL
Kernel.Waypoint((int)size);
Kernel.Waypoint(811);
#endif // SINGULARITY_KERNEL
if (addr != UIntPtr.Zero)
{
Util.MemClear(addr, size);
}
return(addr);
}
internal static unsafe bool AllocateMemory(UIntPtr startAddr,
UIntPtr size)
{
VTable.Deny(inAllocator);
inAllocator = true;
VTable.Assert(PageTable.PageAligned(startAddr));
VTable.Assert(PageTable.PageAligned(size));
#if SINGULARITY_KERNEL
UIntPtr addr = Sing_MemoryManager.KernelExtend(
startAddr, Sing_MemoryManager.PagesFromBytes(size),
Process.kernelProcess, PageType.Unknown);
#elif SINGULARITY_PROCESS
UIntPtr addr = PageTableService.AllocateExtend(startAddr, size);
#endif
inAllocator = false;
if (addr != UIntPtr.Zero)
{
Util.MemClear(addr, size);
return(true);
}
return(false);
}