[ros-diffs] [sir_richard] 47623: [NTOS]: A PFN entry is not necessarily physical only if it is higher than MmHighestPhysicalPage. It can also be physical if it lies in a memory hole within the min-max physical page range. We can detect this by using our PFN Bitmap. So replace all "Is this an I/O mapping?" checks with a check on whether or not the PFN Database entry is NULL (which will check for us both of these statements). This ought to be a macro...

Author: sir_richard
Date: Sun Jun  6 16:15:18 2010
New Revision: 47623

URL: http://svn.reactos.org/svn/reactos?rev=47623&view=rev
Log:
[NTOS]: A PFN entry is not necessarily physical only if it is higher than
MmHighestPhysicalPage. It can also be physical if it lies in a memory hole within the
min-max physical page range. We can detect this by using our PFN Bitmap. So replace all
"Is this an I/O mapping?" checks with a check on whether or not the PFN Database
entry is NULL (which will check for us both of these statements). This ought to be a
macro...

Modified:
    trunk/reactos/ntoskrnl/mm/ARM3/iosup.c
    trunk/reactos/ntoskrnl/mm/ARM3/mdlsup.c
    trunk/reactos/ntoskrnl/mm/mmdbg.c

Modified: trunk/reactos/ntoskrnl/mm/ARM3/iosup.c
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/ntoskrnl/mm/ARM3/iosup.c?r…
==============================================================================
--- trunk/reactos/ntoskrnl/mm/ARM3/iosup.c [iso-8859-1] (original)
+++ trunk/reactos/ntoskrnl/mm/ARM3/iosup.c [iso-8859-1] Sun Jun  6 16:15:18 2010
@@ -90,8 +90,8 @@
     // Also translate the cache attribute
     //
     Pfn = (PFN_NUMBER)(PhysicalAddress.QuadPart >> PAGE_SHIFT);
-    IsIoMapping = (Pfn > MmHighestPhysicalPage) ? TRUE : FALSE;
-    if (!IsIoMapping) Pfn1 = MiGetPfnEntry(Pfn);
+    Pfn1 = MiGetPfnEntry(Pfn);
+    IsIoMapping = (Pfn1 == NULL) ? TRUE : FALSE;
     CacheAttribute = MiPlatformCacheAttributes[IsIoMapping][CacheType];
     
     //
@@ -219,7 +219,7 @@
     //
     // Is this an I/O mapping?
     //
-    if (Pfn > MmHighestPhysicalPage)
+    if (!MiGetPfnEntry(Pfn))
     {
         //
         // Destroy the PTE

Modified: trunk/reactos/ntoskrnl/mm/ARM3/mdlsup.c
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/ntoskrnl/mm/ARM3/mdlsup.c?…
==============================================================================
--- trunk/reactos/ntoskrnl/mm/ARM3/mdlsup.c [iso-8859-1] (original)
+++ trunk/reactos/ntoskrnl/mm/ARM3/mdlsup.c [iso-8859-1] Sun Jun  6 16:15:18 2010
@@ -129,7 +129,7 @@
     //
     // Check if this is an I/O mapping
     //
-    if (Pfn > MmHighestPhysicalPage) Mdl->MdlFlags |= MDL_IO_SPACE;
+    if (!MiGetPfnEntry(Pfn)) Mdl->MdlFlags |= MDL_IO_SPACE;
 }
 
 /*

Modified: trunk/reactos/ntoskrnl/mm/mmdbg.c
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/ntoskrnl/mm/mmdbg.c?rev=47…
==============================================================================
--- trunk/reactos/ntoskrnl/mm/mmdbg.c [iso-8859-1] (original)
+++ trunk/reactos/ntoskrnl/mm/mmdbg.c [iso-8859-1] Sun Jun  6 16:15:18 2010
@@ -85,10 +85,8 @@
     //
     Pfn = (PFN_NUMBER)(PhysicalAddress >> PAGE_SHIFT);
 
-    //
-    // Check if this could be an I/O mapping
-    //
-    if (Pfn > MmHighestPhysicalPage)
+    /* Check if this could be an I/O mapping */
+    if (!MiGetPfnEntry(Pfn))
     {
         //
         // FIXME: We don't support this yet