[ros-arm-bringup] 41631: - Blow away the bottom 2GB of virtual address space in the ARM^3 initializer. Previously this was kind of done with MmUnmapPageTable in MmInit1, but this code (And the function, which had only been used for this purpose, are gone) - Also set the Page Directory for the system/idle process in a slightly more correct way, instead of depending on the CR3 value. Do this in ARM^3 now, and remove the older code (and the MmGetPageDirectory function, which was only used by this).

Author: ros-arm-bringup
Date: Sat Jun 27 09:32:53 2009
New Revision: 41631

URL: http://svn.reactos.org/svn/reactos?rev=41631&view=rev
Log:
- Blow away the bottom 2GB of virtual address space in the ARM^3 initializer. Previously
this was kind of done with MmUnmapPageTable in MmInit1, but this code (And the function,
which had only been used for this purpose, are gone)
- Also set the Page Directory for the system/idle process in a slightly more correct way,
instead of depending on the CR3 value. Do this in ARM^3 now, and remove the older code
(and the MmGetPageDirectory function, which was only used by this).


Modified:
    trunk/reactos/ntoskrnl/mm/ARM3/init.c
    trunk/reactos/ntoskrnl/mm/i386/page.c
    trunk/reactos/ntoskrnl/mm/mminit.c

Modified: trunk/reactos/ntoskrnl/mm/ARM3/init.c
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/ntoskrnl/mm/ARM3/init.c?re…
==============================================================================
--- trunk/reactos/ntoskrnl/mm/ARM3/init.c [iso-8859-1] (original)
+++ trunk/reactos/ntoskrnl/mm/ARM3/init.c [iso-8859-1] Sat Jun 27 09:32:53 2009
@@ -146,6 +146,20 @@
     if (Phase == 0)
     {
         //
+        // Set CR3 for the system process
+        //
+        PointerPte = MiAddressToPde(PAGETABLE_MAP);
+        PageFrameIndex = PFN_FROM_PTE(PointerPte) << PAGE_SHIFT;
+        PsGetCurrentProcess()->Pcb.DirectoryTableBase[0] = PageFrameIndex;
+        
+        //
+        // Blow away user-mode
+        //
+        StartPde = MiAddressToPde(0);
+        EndPde = MiAddressToPde(KSEG0_BASE);
+        RtlZeroMemory(StartPde, (EndPde - StartPde) * sizeof(MMPTE));
+        
+        //
         // Check if this is a machine with less than 19MB of RAM
         //
         if (MmNumberOfPhysicalPages < MI_MIN_PAGES_FOR_SYSPTE_TUNING)

Modified: trunk/reactos/ntoskrnl/mm/i386/page.c
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/ntoskrnl/mm/i386/page.c?re…
==============================================================================
--- trunk/reactos/ntoskrnl/mm/i386/page.c [iso-8859-1] (original)
+++ trunk/reactos/ntoskrnl/mm/i386/page.c [iso-8859-1] Sat Jun 27 09:32:53 2009
@@ -71,12 +71,6 @@
     }
 }
 
-PULONG
-MmGetPageDirectory(VOID)
-{
-    return (PULONG)(ULONG_PTR)__readcr3();
-}
-
 static ULONG
 ProtectToPTE(ULONG flProtect)
 {
@@ -224,32 +218,6 @@
     DirectoryTableBase[1] = 0;
     DPRINT("Finished MmCopyMmInfo(): 0x%x\n", DirectoryTableBase[0]);
     return TRUE;
-}
-
-VOID
-NTAPI
-MmDeletePageTable(PEPROCESS Process, PVOID Address)
-{
-    PEPROCESS CurrentProcess = PsGetCurrentProcess();
-    
-    if (Process != NULL && Process != CurrentProcess)
-    {
-        KeAttachProcess(&Process->Pcb);
-    }
-    
-    MiAddressToPde(Address)->u.Long = 0;
-    MiFlushTlb((PULONG)MiAddressToPde(Address),
-               MiAddressToPte(Address));
-    
-    if (Address >= MmSystemRangeStart)
-    {
-        KeBugCheck(MEMORY_MANAGEMENT);
-        //       MmGlobalKernelPageDirectory[ADDR_TO_PDE_OFFSET(Address)] = 0;
-    }
-    if (Process != NULL && Process != CurrentProcess)
-    {
-        KeDetachProcess();
-    }
 }
 
 static PULONG

Modified: trunk/reactos/ntoskrnl/mm/mminit.c
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/ntoskrnl/mm/mminit.c?rev=4…
==============================================================================
--- trunk/reactos/ntoskrnl/mm/mminit.c [iso-8859-1] (original)
+++ trunk/reactos/ntoskrnl/mm/mminit.c [iso-8859-1] Sat Jun 27 09:32:53 2009
@@ -305,9 +305,6 @@
     /* Dump memory descriptors */
     if (MiDbgEnableMdDump) MiDbgDumpMemoryDescriptors();
 
-    /* Set the page directory */
-    PsGetCurrentProcess()->Pcb.DirectoryTableBase[0] = (ULONG)MmGetPageDirectory();
-
     /* Get the size of FreeLDR's image allocations */
     MmBootImageSize = KeLoaderBlock->Extension->LoaderPagesSpanned;
     MmBootImageSize *= PAGE_SIZE;
@@ -377,9 +374,6 @@
 
     /* Initialize the page list */
     MmInitializePageList();
-
-    /* Unmap low memory */
-    MmDeletePageTable(NULL, 0);
     
     //
     // Initialize ARM³