[ros-diffs] [sir_richard] 47621: [NTOS]: Implement MiRemoveZeroPage and MiZeroPhysicalPage. Not yet used.

Author: sir_richard
Date: Sun Jun  6 16:12:28 2010
New Revision: 47621

URL: http://svn.reactos.org/svn/reactos?rev=47621&view=rev
Log:
[NTOS]: Implement MiRemoveZeroPage and MiZeroPhysicalPage.
Not yet used.

Modified:
    trunk/reactos/ntoskrnl/mm/ARM3/pfnlist.c

Modified: trunk/reactos/ntoskrnl/mm/ARM3/pfnlist.c
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/ntoskrnl/mm/ARM3/pfnlist.c…
==============================================================================
--- trunk/reactos/ntoskrnl/mm/ARM3/pfnlist.c [iso-8859-1] (original)
+++ trunk/reactos/ntoskrnl/mm/ARM3/pfnlist.c [iso-8859-1] Sun Jun  6 16:12:28 2010
@@ -55,6 +55,20 @@
     NULL
 };
 /* FUNCTIONS ******************************************************************/
+
+VOID
+NTAPI
+MiZeroPhysicalPage(IN PFN_NUMBER PageFrameIndex)
+{
+    KIRQL OldIrql;
+    PVOID VirtualAddress;
+    PEPROCESS Process = PsGetCurrentProcess();
+
+    /* Map in hyperspace, then wipe it using XMMI or MEMSET */
+    VirtualAddress = MiMapPageInHyperSpace(Process, PageFrameIndex, &OldIrql);
+    KeZeroPages(VirtualAddress, PAGE_SIZE);
+    MiUnmapPageInHyperSpace(Process, VirtualAddress, OldIrql);
+}
 
 VOID
 NTAPI
@@ -441,6 +455,79 @@
     return PageIndex;
 }
 
+PFN_NUMBER
+NTAPI
+MiRemoveZeroPage(IN ULONG Color)
+{
+    PFN_NUMBER PageIndex;
+    PMMPFN Pfn1;
+    BOOLEAN Zero;
+
+    /* Make sure PFN lock is held and we have pages */
+    ASSERT(KeGetCurrentIrql() == DISPATCH_LEVEL);
+    ASSERT(MmAvailablePages != 0);
+    ASSERT(Color < MmSecondaryColors);
+
+    /* Check the colored zero list */
+#if 0 // Enable when using ARM3 database */
+    PageIndex = MmFreePagesByColor[ZeroedPageList][Color].Flink;
+    if (PageIndex == LIST_HEAD)
+    {
+#endif
+        /* Check the zero list */
+        ASSERT_LIST_INVARIANT(&MmZeroedPageListHead);
+        PageIndex = MmZeroedPageListHead.Flink;
+        Color = PageIndex & MmSecondaryColorMask;
+        if (PageIndex == LIST_HEAD)
+        {
+            ASSERT(MmZeroedPageListHead.Total == 0);
+            Zero = TRUE;
+#if 0 // Enable when using ARM3 database */
+            /* Check the colored free list */
+            PageIndex = MmFreePagesByColor[ZeroedPageList][Color].Flink;
+            if (PageIndex == LIST_HEAD)
+            {
+#endif
+                /* Check the free list */
+                ASSERT_LIST_INVARIANT(&MmFreePageListHead);
+                PageIndex = MmFreePageListHead.Flink;
+                Color = PageIndex & MmSecondaryColorMask;
+                ASSERT(PageIndex != LIST_HEAD);
+                if (PageIndex == LIST_HEAD)
+                {
+                    /* FIXME: Should check the standby list */
+                    ASSERT(MmZeroedPageListHead.Total == 0);
+                }
+#if 0 // Enable when using ARM3 database */
+            }
+#endif
+        }
+#if 0 // Enable when using ARM3 database */
+    }
+#endif
+    /* Sanity checks */
+    Pfn1 = MiGetPfnEntry(PageIndex);
+    ASSERT((Pfn1->u3.e1.PageLocation == FreePageList) ||
+           (Pfn1->u3.e1.PageLocation == ZeroedPageList));
+
+    /* Remove the page from its list */
+    PageIndex = MiRemovePageByColor(PageIndex, Color);
+    ASSERT(Pfn1 == MiGetPfnEntry(PageIndex));
+    
+    /* Zero it, if needed */
+    if (Zero) MiZeroPhysicalPage(PageIndex);
+    
+    /* Sanity checks */
+    ASSERT(Pfn1->u3.e2.ReferenceCount == 0);
+    ASSERT(Pfn1->u2.ShareCount == 0);
+    ASSERT_LIST_INVARIANT(&MmFreePageListHead);
+    ASSERT_LIST_INVARIANT(&MmZeroedPageListHead);
+
+    /* Return the page */
+    return PageIndex;
+}
+
+
 PMMPFN
 NTAPI
 MiRemoveHeadList(IN PMMPFNLIST ListHead)