internal unsafe override void Visit(UIntPtr *loc)
{
UIntPtr addr = *loc;
UIntPtr page = PageTable.Page(addr);
PageType pageType = PageTable.Type(page);
if (!PageTable.IsZombiePage(pageType))
{
VTable.Assert(PageTable.IsGcPage(pageType) ||
PageTable.IsNonGcPage(pageType) ||
PageTable.IsStackPage(pageType) ||
PageTable.IsSharedPage(pageType));
return;
}
UIntPtr vtableAddr = Allocator.GetObjectVTable(addr);
if ((vtableAddr & 0x1) == 0x1)
{
// Link this field to be updated
*loc = vtableAddr;
Allocator.SetObjectVTable(addr, (UIntPtr)loc + 1);
}
else
{
// Zero the reference (not marked)
*loc = UIntPtr.Zero;
}
}
internal unsafe override void Visit(UIntPtr *loc)
{
UIntPtr addr = *loc;
// Ignore pointers out of our memory area
if (PageTable.IsForeignAddr(addr))
{
return;
}
UIntPtr page = PageTable.Page(addr);
PageType pageType = PageTable.Type(page);
if (!PageTable.IsGcPage(pageType))
{
VTable.Assert((PageTable.IsNonGcPage(pageType) &&
PageTable.IsMyPage(page)) ||
PageTable.IsStackPage(pageType));
return;
}
VTable.Assert(PageTable.IsMyPage(page));
Object obj = Magic.fromAddress(addr);
VTable.Assert(IsPossiblyObject(obj), "Bad Object/VTable");
if (obj.GcMark() == UIntPtr.Zero)
{
// The object was not live
*loc = UIntPtr.Zero;
}
}
internal override unsafe void Visit(UIntPtr *loc)
{
UIntPtr objAddr = *loc;
UIntPtr page = PageTable.Page(objAddr);
if (!PageTable.IsGcPage(page))
{
PageType pageType = PageTable.Type(page);
VTable.Assert(pageType == PageType.NonGC ||
pageType == PageType.Stack,
@"pageType == PageType.NonGC ||
pageType == PageType.Stack");
return;
}
Object obj = Magic.fromAddress(objAddr);
if (obj.GcMark((UIntPtr)1))
{
this.time = this.time + 1;
setDfsDiscoveryTime(obj, this.time);
UIntPtr vtableAddr = Magic.addressOf(obj.vtable);
this.Visit(&vtableAddr);
this.VisitReferenceFields(obj);
this.time = this.time + 1;
setDfsFinishingTime(obj, this.time);
}
}
internal unsafe override void Visit(UIntPtr *loc)
{
UIntPtr addr = *loc;
UIntPtr page = PageTable.Page(addr);
PageType pageType = PageTable.Type(page);
if (!PageTable.IsZombiePage(pageType))
{
VTable.Assert(PageTable.IsGcPage(pageType) ||
PageTable.IsNonGcPage(pageType) ||
PageTable.IsStackPage(pageType) ||
PageTable.IsSharedPage(pageType));
return;
}
UIntPtr vtableAddr = Allocator.GetObjectVTable(addr);
// Mark object
if (vtableAddr == UIntPtr.Zero)
{
VTable.DebugPrint("Found null vtable in MarkReference (loc = 0x{0:x8}, addr = 0x{1:x8})\n",
__arglist(((UIntPtr)loc), addr));
VTable.NotReached();
}
*loc = vtableAddr;
Allocator.SetObjectVTable(addr, (UIntPtr)loc + 1);
// If first visit to the object, schedule visit of fields
if ((vtableAddr & 0x1) == 0)
{
MarkVisit(addr, vtableAddr & (UIntPtr) ~2U);
}
}
internal static void ReleaseStandbyPages() {
while (!pageCache.IsEmpty) {
UIntPtr pageAddr = pageCache.RemoveHead();
PageManager.ReleaseUnusedPages(PageTable.Page(pageAddr),
(UIntPtr) 1, false);
}
}
internal override int GetGeneration(Object obj)
{
UIntPtr addr = Magic.addressOf(obj);
UIntPtr page = PageTable.Page(addr);
return((int)PageTable.Type(page));
}
internal unsafe override void Visit(UIntPtr *loc)
{
UIntPtr addr = *loc;
// Ignore pointers out of our memory area
if (PageTable.IsForeignAddr(addr))
{
return;
}
UIntPtr page = PageTable.Page(addr);
if (!PageTable.IsMyGcPage(page))
{
PageType pageType = PageTable.Type(page);
#if SINGULARITY_PROCESS
// We have to allow reference pointers to the
// ThreadContext, which lives in the kernel space.
VTable.Assert((PageTable.IsNonGcPage(pageType) &&
PageTable.IsMyPage(page)) ||
PageTable.IsStackPage(pageType) ||
PageTable.IsSharedPage(pageType) ||
(PageTable.IsGcPage(pageType) &&
PageTable.IsKernelPage(page)));
#else
VTable.Assert((PageTable.IsNonGcPage(pageType) &&
PageTable.IsMyPage(page)) ||
PageTable.IsStackPage(pageType) ||
PageTable.IsSharedPage(pageType));
#endif
return;
}
UIntPtr objectAddr = SegregatedFreeList.Find(addr);
markAndProcessReferenceVisitor.Visit(&objectAddr);
}
internal static bool IsMyGcCard(UIntPtr c)
{
VTable.Assert(IsValidCardNo(c), "IsMyGcCard invalid");
UIntPtr page = PageTable.Page(CardAddr(c));
return(PageTable.IsMyGcPage(page));
}
protected static void deallocationListChecker()
{
// Check for nonzero reference counts and for
// loops in the delayed deallocation list.
for (Object block = delayedDeallocationList;
block != null; block = getNextLink(block))
{
UIntPtr objAddr = Magic.addressOf(block);
UIntPtr page = PageTable.Page(objAddr);
if (!PageTable.IsGcPage(page))
{
VTable.DebugPrint("Non-GC memory for freeing!\n");
VTable.DebugBreak();
}
uint refState = block.REF_STATE;
if ((refState & RSMasks.refCount) != 0)
{
VTable.DebugPrint("Non-zero reference count!\n");
VTable.DebugBreak();
}
block.REF_STATE = refState + 1;
}
// Make another pass to reset reference counts.
for (Object block = delayedDeallocationList;
block != null; block = getNextLink(block))
{
block.REF_STATE--;
}
}
internal unsafe override void Visit(UIntPtr *loc)
{
UIntPtr addr = *loc;
// Ignore pointers out of our memory area
if (PageTable.IsForeignAddr(addr))
{
return;
}
UIntPtr page = PageTable.Page(addr);
PageType pageType = PageTable.Type(page);
if (!PageTable.IsGcPage(pageType))
{
VTable.Assert((PageTable.IsNonGcPage(pageType) &&
PageTable.IsMyPage(page)) ||
PageTable.IsStackPage(pageType));
return;
}
VTable.Assert(PageTable.IsMyPage(page));
Object obj = Magic.fromAddress(addr);
VTable.Assert(IsPossiblyObject(obj), "Bad object/vtable");
if (obj.GcMark((UIntPtr)1))
{
// We changed the color of the object, so we
// have to mark the objects reachable from the fields
workList.Write(addr);
}
}
internal unsafe override void Visit(UIntPtr *loc)
{
UIntPtr addr = *loc;
UIntPtr page = PageTable.Page(addr);
PageType pageType = PageTable.Type(page);
if (!PageTable.IsZombiePage(pageType))
{
VTable.Assert(PageTable.IsGcPage(pageType) ||
PageTable.IsNonGcPage(pageType) ||
PageTable.IsStackPage(pageType) ||
PageTable.IsSharedPage(pageType),
"Semispace:ForwardOnlyReferenceVisitor");
return;
}
PageType gen = PageTable.ZombieToLive(pageType);
UIntPtr vtableAddr = Allocator.GetObjectVTable(addr);
UIntPtr vtablePageIndex = PageTable.Page(vtableAddr);
if (PageTable.Type(vtablePageIndex) == gen)
{
// The vtable field is really a forwarding pointer
*loc = vtableAddr;
}
else
{
// The object was not live
*loc = UIntPtr.Zero;
}
}
internal static unsafe void Verify(UnusedBlockHeader *header)
{
VTable.Assert(header->magic == (UIntPtr)magicNumber,
"Bad magic number in UnusedBlockHeader");
VTable.Assert(header->count > 0,
"Count <= 0 in UnusedBlockHeader");
VTable.Assert(header->prev->next == header,
"UnusedBlockHeader not linked properly (1)");
if (header->next != null)
{
VTable.Assert(header->next->prev == header,
"UnusedBlockHeader not linked properly (2)");
}
UIntPtr count = header->count;
UnusedBlockHeader *tailBlock = (UnusedBlockHeader *)
(((UIntPtr)header) + PageTable.RegionSize(count - 1));
VTable.Assert(tailBlock->curr == header,
"UnusedBlockHeader tail->curr is incorrect");
if (PageManager.SlowDebug)
{
UIntPtr page = PageTable.Page((UIntPtr)header);
for (UIntPtr i = UIntPtr.Zero; i < count; i++)
{
VTable.Assert(PageTable.IsUnusedPage(page + i) &&
PageTable.IsMyPage(page + i),
"Incorrect page in unused region");
}
}
}
internal override unsafe void Visit(UIntPtr *loc)
{
UIntPtr addr = *loc;
UIntPtr page = PageTable.Page(addr);
if (!PageTable.IsGcPage(page))
{
PageType pageType = PageTable.Type(page);
VTable.Assert(pageType == PageType.NonGC ||
pageType == PageType.Stack,
@"pageType == PageType.NonGC ||
pageType == PageType.Stack");
return;
}
UIntPtr objAddr = SegregatedFreeList.Find(addr);
Object obj = Magic.fromAddress(objAddr);
UIntPtr count = getBackupRefcount(obj);
setBackupRefcount(obj, count + 1);
if (obj.GcMark((UIntPtr)1))
{
this.workList.Write(objAddr);
}
}
internal override unsafe void Visit(UIntPtr *loc)
{
UIntPtr pageLoc = PageTable.Page((UIntPtr)loc);
PageType pageType = PageTable.Type(pageLoc);
if (pageType != PageType.NonGC &&
pageType != PageType.Stack)
{
VTable.Assert(PageTable.IsGcPage(pageLoc),
@"PageTable.IsGcPage(pageLoc)");
return;
}
uint addr = (uint)*loc;
if (pageType == PageType.NonGC || (addr & 0x03) == 0)
{
this.visitor.Visit(loc);
}
if (pageType == PageType.Stack)
{
*loc = (UIntPtr)(addr | 0x01);
}
}
internal static unsafe void SetStaticDataPages(UIntPtr startAddr,
UIntPtr size)
{
#if SINGULARITY
// It's perfectly fine to be given memory outside the page table region, so
// long as we intend to treat that memory as NonGC anyway.
if (startAddr < PageTable.baseAddr)
{
if (startAddr + size < PageTable.baseAddr)
{
// nothing to do. All pages are below the base covered by the page table
return;
}
// The range overlaps with the region covered by the page table
size -= (PageTable.baseAddr - startAddr);
startAddr = PageTable.baseAddr;
}
UIntPtr endAddr = startAddr + size;
if (endAddr > PageTable.limitAddr)
{
if (startAddr > PageTable.limitAddr)
{
// nothing to do. All pages are above the limit covered by the page table
return;
}
// The range overlaps with the region covered by the page table
size -= (PageTable.limitAddr - endAddr);
}
#endif
UIntPtr startIndex = PageTable.Page(startAddr);
UIntPtr pageCount = PageTable.PageCount(size);
PageTable.SetType(startIndex, pageCount, PageType.NonGC);
}
private unsafe void CompactHeapObjects(UIntPtr previousEnd)
{
while (!this.relocationQueue.IsEmpty)
{
UIntPtr sourceAddress = this.relocationQueue.Read();
UIntPtr destinationAddress = this.relocationQueue.Read();
UIntPtr runLength = this.relocationQueue.Read();
if (previousEnd != destinationAddress)
{
VTable.Assert(previousEnd < destinationAddress);
if (PageTable.Page(destinationAddress) !=
PageTable.Page(previousEnd + PreHeader.Size))
{
if (!PageTable.PageAligned(previousEnd))
{
UIntPtr pageLimit = PageTable.PagePad(previousEnd);
BumpAllocator.WriteUnusedMarker(previousEnd);
previousEnd += UIntPtr.Size;
Util.MemClear(previousEnd,
pageLimit - previousEnd);
}
if (!PageTable.PageAligned(destinationAddress))
{
// This only happens before pinned objects and
// large objects
UIntPtr start =
PageTable.PageAlign(destinationAddress);
VTable.Assert(previousEnd <= start);
while (start < destinationAddress)
{
Allocator.WriteAlignment(start);
start += UIntPtr.Size;
}
}
UIntPtr objAddr = destinationAddress + PreHeader.Size;
InteriorPtrTable.SetFirst(objAddr);
}
else
{
VTable.Assert(previousEnd < destinationAddress);
UIntPtr start = previousEnd;
while (start < destinationAddress)
{
Allocator.WriteAlignment(start);
start += UIntPtr.Size;
}
}
}
Util.MemCopy(destinationAddress, sourceAddress, runLength);
previousEnd = destinationAddress + runLength;
}
// Zero out the end of the allocation page
if (!PageTable.PageAligned(previousEnd))
{
UIntPtr pageLimit = PageTable.PagePad(previousEnd);
Util.MemClear(previousEnd, pageLimit - previousEnd);
}
this.relocationQueue.Cleanup(true);
}
internal static unsafe void VerifyFirst(UIntPtr previousObjectAddr,
UIntPtr objectAddr)
{
UIntPtr page = PageTable.Page(objectAddr);
if (previousObjectAddr != UIntPtr.Zero)
{
UIntPtr previousPage = PageTable.Page(previousObjectAddr);
UIntPtr pageCursor = previousPage + 1;
while (pageCursor < page)
{
uint cursorOffset = PageTable.Extra(pageCursor);
UIntPtr objAddr = (PageTable.PageAddr(pageCursor) +
cursorOffset - OFFSET_SKEW);
if (!(cursorOffset <= OFFSET_NO_DATA ||
BumpAllocator.IsUnusedSpace(objAddr) ||
Allocator.IsAlignment(objAddr) ||
BumpAllocator.IsRestOfPageZero(objAddr)))
{
VTable.DebugPrint
("cursorOffset={0:x} OFFSET_NO_DATA={1:x} objAddr={2:x} unused={3} isalign={4} iszero={5}\n",
__arglist((cursorOffset),
(OFFSET_NO_DATA),
((long)objAddr),
(BumpAllocator.IsUnusedSpace(objAddr)),
(Allocator.IsAlignment(objAddr)),
(BumpAllocator.IsRestOfPageZero(objAddr))));
}
VTable.Assert(cursorOffset <= OFFSET_NO_DATA ||
BumpAllocator.IsUnusedSpace(objAddr) ||
Allocator.IsAlignment(objAddr) ||
BumpAllocator.IsRestOfPageZero(objAddr),
"VerifyFirst 1");
pageCursor++;
}
}
uint offset = PageTable.Extra(page);
if (offset > OFFSET_NO_DATA)
{
UIntPtr firstAddr =
PageTable.PageAddr(page) + offset - OFFSET_SKEW;
if (!(firstAddr == objectAddr ||
(firstAddr + UIntPtr.Size == objectAddr &&
Allocator.IsAlignment(firstAddr))))
{
VTable.DebugPrint
("firstAddr={0:x} objectAddr={1:x} isalign={2}\n",
__arglist(((long)firstAddr),
((long)objectAddr),
(Allocator.IsAlignment(firstAddr))));
}
VTable.Assert(firstAddr == objectAddr ||
(firstAddr + 4 == objectAddr &&
Allocator.IsAlignment(firstAddr)),
"VerifyFirst 2");
}
}
internal static unsafe void SetFirst(UIntPtr newAddr)
{
VTable.Assert(PageTable.IsGcPage(PageTable.Page(newAddr)),
"SetFirst on a non-GC page");
UIntPtr page = PageTable.Page(newAddr);
UIntPtr offset = newAddr - PageTable.PageAddr(page);
PageTable.SetExtra(page, unchecked ((uint)(offset + OFFSET_SKEW)));
}
void VisitObjects(ObjectLayout.ObjectVisitor objectVisitor,
UIntPtr lowAddr, UIntPtr highAddr)
{
VTable.Assert(PageTable.PageAligned(lowAddr));
VTable.Assert(PageTable.PageAligned(highAddr));
UIntPtr lowPage = PageTable.Page(lowAddr);
UIntPtr highPage = PageTable.Page(highAddr);
SegregatedFreeList.VisitObjects(lowPage, highPage, objectVisitor);
}
private static void Clear(UIntPtr startAddr,
UIntPtr regionSize)
{
VTable.Assert(PageTable.PageAligned(startAddr));
VTable.Assert(PageTable.PageAligned(regionSize));
MemoryManager.IgnoreMemoryContents(startAddr, regionSize);
MarkUnusedPages(Thread.CurrentThread,
PageTable.Page(startAddr),
PageTable.PageCount(regionSize),
false);
}
internal override void VisitObjects
(ObjectLayout.ObjectVisitor objVisitor,
UIntPtr lowAddr,
UIntPtr highAddr)
{
UIntPtr lowPage = PageTable.Page(lowAddr);
UIntPtr highPage = PageTable.Page(highAddr);
SegregatedFreeList.VisitObjects(lowPage,
highPage,
objVisitor);
}
internal override unsafe void Visit(UIntPtr *loc)
{
// <loc> is an address of a reference location
// in the static data area.
UIntPtr page = PageTable.Page((UIntPtr)loc);
PageType pageType = PageTable.Type(page);
VTable.Assert(pageType == PageType.NonGC,
@"pageType == PageType.NonGC");
PtrCount++;
}
// Finds the object base for an interior pointer. In the case of a
// pointer to the tail of an object and the head of another, it will
// return the former object (the one whose tail we point at). To
// get the base pointer for a pointer into the pre-header, you should
// add PreHeader.Size before calling this.
internal static UIntPtr Find(UIntPtr addr)
{
UIntPtr page = PageTable.Page(addr);
UIntPtr currAddr = InteriorPtrTable.First(page);
// Look out for the unused space token: this page may not
// have been completely allocated: its "first" object might not
// be valid.
if (BumpAllocator.IsUnusedSpace(currAddr) || currAddr > addr)
{
// Back up to the previous object. Should be fast
// since First updated the InteriorPtrTable entries.
currAddr = Before(PageTable.PageAddr(page));
}
VTable.Assert(!BumpAllocator.IsUnusedSpace(currAddr),
"InteriorPtrTable.Find 0");
VTable.Assert(currAddr <= addr, "InteriorPtrTable.Find 1");
while (true)
{
// Watch out for alignment padding; advance the pointer if
// it points to a syncblock index rather than a vtable
// pointer. Note that we must do this before scrolling,
// since the page table value was set before we knew the
// required alignment.
if (Allocator.IsAlignment(currAddr))
{
currAddr += UIntPtr.Size;
}
else if (BumpAllocator.IsUnusedSpace(currAddr))
{
UIntPtr postAddr =
PageTable.PagePad(currAddr) + PreHeader.Size;
VTable.Assert(postAddr <= addr, "InteriorPtrTable.Find 2");
currAddr = postAddr;
}
else
{
VTable.Assert(currAddr <= addr, "InteriorPtrTable.Find 3");
UIntPtr size = ObjectSize(currAddr);
VTable.Assert(size >= UIntPtr.Zero,
"InteriorPtrTable.Find 4");
UIntPtr postAddr = currAddr + size;
if (postAddr > addr)
{
return(currAddr);
}
else
{
currAddr = postAddr;
}
}
}
}
internal static void Initialize(UIntPtr systemMemorySize)
{
allocPtr = MemoryManager.AllocateMemory(systemMemorySize);
limitPtr = allocPtr + systemMemorySize;
if (GC.gcType != GCType.NullCollector)
{
PageManager.SetStaticDataPages(allocPtr, systemMemorySize);
#if !SINGULARITY
PageTable.SetProcess(PageTable.Page(allocPtr),
PageTable.PageCount(systemMemorySize));
#endif
}
}
internal static void Truncate()
{
UIntPtr allocLimit = PageTable.PagePad(allocPtr);
UIntPtr unusedSize = limitPtr - allocLimit;
if (GC.gcType != GCType.NullCollector)
{
PageManager.ReleaseUnusedPages(PageTable.Page(allocLimit),
PageTable.PageCount(unusedSize),
true);
}
limitPtr = allocLimit;
}
internal static bool ShouldPin(UIntPtr objAddr)
{
UIntPtr page = PageTable.Page(objAddr);
if (PageTable.Type(page) != SegregatedFreeList.SMALL_OBJ_PAGE)
{
// in practice this won't be reached
return(true);
}
SegregatedFreeList.PageHeader *ph =
(SegregatedFreeList.PageHeader *)PageTable.PageAddr(page);
return(new CoCoPageUserValue(ph->userValue).Pinned);
}
internal static void MarkIfNecessaryInline(UIntPtr value,
Thread thread)
{
#if !SINGULARITY || CONCURRENT_MS_COLLECTOR
UIntPtr marked = markedColor;
if (ThreadHeaderQueue.GcMark(Magic.fromAddress(value)) != marked)
{
VTable.Assert(PageTable.IsMyPage(PageTable.Page(value)));
UIntPtr unmarked = unmarkedColor;
ThreadHeaderQueue.Push(thread, value, marked, unmarked);
}
#endif // CONCURRENT_MS_COLLECTOR
}
private static void MarkUnusedPages(Thread currentThread,
UIntPtr startPage,
UIntPtr pageCount,
bool fCleanPages)
{
Trace.Log(Trace.Area.Page,
"MarkUnusedPages start={0:x} count={1:x}",
__arglist(startPage, pageCount));
UIntPtr endPage = startPage + pageCount;
if (avoidDirtyPages && !fCleanPages)
{
UIntPtr dirtyStartAddr = PageTable.PageAddr(startPage);
UIntPtr dirtySize = PageTable.RegionSize(pageCount);
Util.MemClear(dirtyStartAddr, dirtySize);
fCleanPages = true;
}
bool iflag = EnterMutex(currentThread);
try {
if (endPage < PageTable.pageTableCount)
{
if (PageTable.IsUnusedPage(endPage) &&
PageTable.IsMyPage(endPage))
{
UIntPtr regionSize = UnlinkUnusedPages(endPage);
endPage += regionSize;
}
}
UIntPtr queryStartPage = startPage - 1;
UIntPtr newStartPage = startPage;
if (PageTable.IsUnusedPage(queryStartPage) &&
PageTable.IsMyPage(queryStartPage))
{
UnusedBlockHeader *tailUnused = (UnusedBlockHeader *)
PageTable.PageAddr(queryStartPage);
UIntPtr newStartAddr = (UIntPtr)tailUnused->curr;
newStartPage = PageTable.Page(newStartAddr);
UIntPtr regionSize = UnlinkUnusedPages(newStartPage);
VTable.Assert(newStartPage + regionSize == startPage);
}
PageType pageType =
fCleanPages ? PageType.UnusedClean : PageType.UnusedDirty;
PageTable.SetType(startPage, pageCount, pageType);
LinkUnusedPages(newStartPage, endPage - newStartPage, false);
} finally {
LeaveMutex(currentThread, iflag);
}
}
private unsafe void SkipDestinationAreas(ref UIntPtr destPage,
UIntPtr destCursor,
ref UIntPtr destLimit,
UIntPtr sourceCursor)
{
UIntPtr cursorPage = PageTable.Page(destCursor);
UIntPtr sourcePage = PageTable.Page(sourceCursor);
if (cursorPage != sourcePage)
{
UIntPtr destPageLimit = PageTable.PagePad(destCursor);
if (destPageLimit != destCursor)
{
cursorPage++;
}
VTable.Assert(PageTable.PageAligned(destLimit));
UIntPtr limitPage = PageTable.Page(destLimit);
while (destPage < sourcePage)
{
if (cursorPage < limitPage)
{
this.RegisterSkippedPages(cursorPage, limitPage);
}
do
{
destPage++;
} while (!IsMyZombiePage(destPage));
cursorPage = destPage;
do
{
destPage++;
} while (IsMyZombiePage(destPage));
limitPage = destPage;
}
destLimit = PageTable.PageAddr(limitPage);
VTable.Assert(destPage > sourcePage);
VTable.Assert(cursorPage <= sourcePage);
if (cursorPage < sourcePage)
{
this.RegisterSkippedPages(cursorPage, sourcePage);
cursorPage = sourcePage;
}
InteriorPtrTable.ClearFirst(cursorPage, destPage);
InteriorPtrTable.SetFirst(sourceCursor + PreHeader.Size);
if (GC.remsetType == RemSetType.Cards)
{
OffsetTable.ClearLast(PageTable.PageAddr(cursorPage),
PageTable.PageAddr(destPage) - 1);
}
}
}
// Bartok uses the extra field in the PageTable to easily
// map from a stack address to the thread that owns that stack.
// This is used to implement GetCurrentThread.
// Singularity uses a different mechanism that does not involve
// the extra data at all.
private static unsafe void SetStackPages(UIntPtr startAddr,
UIntPtr endAddr,
Thread thread)
{
UIntPtr startPage = PageTable.Page(startAddr);
UIntPtr endPage = PageTable.Page(endAddr);
UIntPtr pageCount = endPage - startPage;
PageTable.VerifyType(startPage, pageCount, PageType.Unallocated);
PageTable.VerifyExtra(startPage, pageCount, 0);
PageTable.SetType(startPage, pageCount, PageType.Stack);
PageTable.SetExtra(startPage, pageCount,
(uint)thread.threadIndex);
}
