internal static void SetRange(UIntPtr start, UIntPtr bytes, uint tag)
{
if (useAddressTranslation)
{
KernelRange.SetRange(start, bytes, tag);
}
else
{
FlatPages.SetRange(start, bytes, tag);
}
}
/////////////////////////////////////
// PUBLIC METHODS
/////////////////////////////////////
internal static void Initialize()
{
DebugStub.WriteLine("Initializing memory subsystem...");
// Only allow paging in HALs which support running in Ring 0
// but always force paging in the HIP builds for compatibility
#if !PAGING
useAddressTranslation = UseAddressTranslationInCmdLine();
#else
useAddressTranslation = true;
#endif
if (useAddressTranslation)
{
DebugStub.WriteLine("Using address translation...\n");
Platform p = Platform.ThePlatform;
// Set up the hardware-pages table and reserve a range for
// I/O memory
IOMemoryBaseAddr = PhysicalPages.Initialize(Platform.IO_MEMORY_SIZE);
// Set up the I/O memory heap
KernelIOMemoryHeap = new PhysicalHeap((UIntPtr)IOMemoryBaseAddr.Value,
(UIntPtr)(IOMemoryBaseAddr.Value + Platform.IO_MEMORY_SIZE));
// Set up virtual memory. ** This enables paging ** !
VMManager.Initialize();
// Set up the kernel's memory ranges.
//
// The kernel's general-purpose range is special because
// it *describes* low memory as well as the GC range proper
// so the kernel's GC doesn't get confused by pointers to
// static data in the kernel image.
KernelRange = new VirtualMemoryRange_struct(
VMManager.KernelHeapBase,
VMManager.KernelHeapLimit,
UIntPtr.Zero,
VMManager.KernelHeapLimit,
null); // no concurrent access to page descriptors yet
// Mark the kernel's special areas. First, record the kernel memory.
if (p.KernelDllSize != 0)
{
UIntPtr kernelDllLimit = p.KernelDllBase + p.KernelDllSize;
KernelRange.SetRange(p.KernelDllBase, kernelDllLimit,
MemoryManager.KernelPageNonGC);
}
// Record the boot allocated kernel memory.
if (p.BootAllocatedMemorySize != 0)
{
UIntPtr bootAllocatedMemoryLimit = p.BootAllocatedMemory + p.BootAllocatedMemorySize;
KernelRange.SetRange(p.BootAllocatedMemory, bootAllocatedMemoryLimit,
MemoryManager.KernelPageNonGC);
}
// Set stack page for CPU 0
KernelRange.SetRange(Platform.BootCpu.KernelStackLimit,
(Platform.BootCpu.KernelStackBegin - Platform.BootCpu.KernelStackLimit),
MemoryManager.KernelPageStack);
DebugStub.WriteLine("MemoryManager initialized with {0} physical pages still free",
__arglist(PhysicalPages.GetFreePageCount()));
KernelRange.Dump("Initialized");
isInitialized = true;
}
else
{
FlatPages.Initialize();
DebugStub.WriteLine("KernelBaseAddr: {0:x8} KernelLimitAddr {1:x8}",
__arglist(KernelBaseAddr,
KernelBaseAddr + BytesFromPages(KernelPageCount)));
}
}