[MM]

- Halfplement MmArmInitSystem, it's broken atm - Update some variable drfinitions from ULONG to ULONG_PTR - Add some amd64 specific constants svn path=/branches/ros-amd64-bringup/; revision=44035
2026-09-02 04:13:34 +00:00 · 2009-11-09 06:46:31 +00:00
parent 256a3cb5cc
commit 2e7b3fde50
2 changed files with 481 additions and 31 deletions
@@ -6,6 +6,44 @@
 * PROGRAMMERS:     ReactOS Portable Systems Group
 */

+#ifdef _M_AMD64
+
+#define MI_MIN_PAGES_FOR_NONPAGED_POOL_TUNING ((255*1024*1024) >> PAGE_SHIFT)
+#define MI_MIN_PAGES_FOR_SYSPTE_TUNING         ((19*1024*1024) >> PAGE_SHIFT)
+#define MI_MIN_PAGES_FOR_SYSPTE_BOOST          ((32*1024*1024) >> PAGE_SHIFT)
+#define MI_MAX_INIT_NONPAGED_POOL_SIZE         (128 * 1024 * 1024)
+#define MI_MAX_NONPAGED_POOL_SIZE              (128 * 1024 * 1024)
+#define MI_MAX_FREE_PAGE_LISTS                 4
+
+#define MI_MIN_INIT_PAGED_POOLSIZE             (32 * 1024 * 1024)
+
+#define MI_SESSION_VIEW_SIZE                   (20 * 1024 * 1024)
+#define MI_SESSION_POOL_SIZE                   (16 * 1024 * 1024)
+#define MI_SESSION_IMAGE_SIZE                  (8 * 1024 * 1024)
+#define MI_SESSION_WORKING_SET_SIZE            (4 * 1024 * 1024)
+#define MI_SESSION_SIZE                        (MI_SESSION_VIEW_SIZE + \
+                                                MI_SESSION_POOL_SIZE + \
+                                                MI_SESSION_IMAGE_SIZE + \
+                                                MI_SESSION_WORKING_SET_SIZE)
+
+#define MI_SYSTEM_VIEW_SIZE                    (16 * 1024 * 1024)
+
+#define MI_PAGED_POOL_START                    (PVOID)0xFFFFFA8000000000ULL
+#define MI_NONPAGED_POOL_END                   (PVOID)0xFFFFFAE000000000ULL
+
+#define MM_HIGHEST_VAD_ADDRESS \
+    (PVOID)((ULONG_PTR)MM_HIGHEST_USER_ADDRESS - (16 * PAGE_SIZE))
+
+
+//
+// FIXFIX: These should go in ex.h after the pool merge
+//
+#define POOL_LISTS_PER_PAGE (PAGE_SIZE / sizeof(LIST_ENTRY))
+#define BASE_POOL_TYPE_MASK 1
+#define POOL_MAX_ALLOC (PAGE_SIZE - (sizeof(POOL_HEADER) + sizeof(LIST_ENTRY)))
+
+#else
+
 #define MI_MIN_PAGES_FOR_NONPAGED_POOL_TUNING ((255*1024*1024) >> PAGE_SHIFT)
 #define MI_MIN_PAGES_FOR_SYSPTE_TUNING         ((19*1024*1024) >> PAGE_SHIFT)
 #define MI_MIN_PAGES_FOR_SYSPTE_BOOST          ((32*1024*1024) >> PAGE_SHIFT)
@@ -40,6 +78,8 @@
 #define BASE_POOL_TYPE_MASK 1
 #define POOL_MAX_ALLOC (PAGE_SIZE - (sizeof(POOL_HEADER) + sizeof(LIST_ENTRY)))

+#endif
+
 typedef struct _POOL_DESCRIPTOR
 {
    POOL_TYPE PoolType;
@@ -123,27 +163,27 @@ typedef struct _PHYSICAL_MEMORY_DESCRIPTOR

 extern MMPTE HyperTemplatePte;

-extern ULONG MmSizeOfNonPagedPoolInBytes;
-extern ULONG MmMaximumNonPagedPoolInBytes;
+extern ULONG_PTR MmSizeOfNonPagedPoolInBytes;
+extern ULONG_PTR MmMaximumNonPagedPoolInBytes;
 extern PVOID MmNonPagedSystemStart;
 extern PVOID MmNonPagedPoolStart;
 extern PVOID MmNonPagedPoolExpansionStart;
 extern PVOID MmNonPagedPoolEnd;
-extern ULONG MmSizeOfPagedPoolInBytes;
+extern ULONG_PTR MmSizeOfPagedPoolInBytes;
 extern PVOID MmPagedPoolStart;
 extern PVOID MmPagedPoolEnd;
 extern PVOID MmSessionBase;
-extern ULONG MmSessionSize;
+extern ULONG_PTR MmSessionSize;
 extern PMMPTE MmFirstReservedMappingPte, MmLastReservedMappingPte;
 extern PMMPTE MiFirstReservedZeroingPte;
 extern MI_PFN_CACHE_ATTRIBUTE MiPlatformCacheAttributes[2][MmMaximumCacheType];
 extern PPHYSICAL_MEMORY_DESCRIPTOR MmPhysicalMemoryBlock;
-extern ULONG MmBootImageSize;
+extern ULONG_PTR MmBootImageSize;
 extern PMMPTE MmSystemPtesStart[MaximumPtePoolTypes];
 extern PMMPTE MmSystemPtesEnd[MaximumPtePoolTypes];
 extern PMEMORY_ALLOCATION_DESCRIPTOR MxFreeDescriptor;
 extern MEMORY_ALLOCATION_DESCRIPTOR MxOldFreeDescriptor;
-extern ULONG MxPfnAllocation;
+extern ULONG_PTR MxPfnAllocation;
 extern MM_PAGED_POOL_INFO MmPagedPoolInfo;
 extern RTL_BITMAP MiPfnBitMap;
 extern KGUARDED_MUTEX MmPagedPoolMutex;
@@ -151,10 +191,10 @@ extern PVOID MmPagedPoolStart;
 extern PVOID MmPagedPoolEnd;
 extern PVOID MmNonPagedSystemStart;
 extern PVOID MiSystemViewStart;
-extern ULONG MmSystemViewSize;
+extern ULONG_PTR MmSystemViewSize;
 extern PVOID MmSessionBase;
 extern PVOID MiSessionSpaceEnd;
-extern ULONG MmSizeOfPagedPoolInBytes;
+extern ULONG_PTR MmSizeOfPagedPoolInBytes;
 extern PMMPTE MmSystemPagePtes;

 NTSTATUS
@@ -15,54 +15,464 @@

 #include "../ARM3/miarm.h"

+#define MI_SESSION_SPACE_END (PVOID)0xFFFFF98000000000ULL
+#define MI_SESSION_VIEW_END 0xFFFFF97FFF000000ULL
+#define MI_NON_PAGED_SYSTEM_START_MIN 0x0FFFFFAA000000000ULL

 /* GLOBALS *****************************************************************/

-ULONG MmMaximumNonPagedPoolPercent;
-ULONG MmSizeOfNonPagedPoolInBytes;
-ULONG MmMaximumNonPagedPoolInBytes;
+ULONG64 MmUserProbeAddress = 0x7FFFFFF0000ULL;
+PVOID MmHighestUserAddress = (PVOID)0x7FFFFFEFFFFULL;
+PVOID MmSystemRangeStart = (PVOID)KSEG0_BASE; // FFFF080000000000

-PVOID MiSessionSpaceEnd;    // 0xC0000000
+/* Size of session view, pool, and image */
+ULONG64 MmSessionSize = MI_SESSION_SIZE;
+ULONG64 MmSessionViewSize = MI_SESSION_VIEW_SIZE;
+ULONG64 MmSessionPoolSize = MI_SESSION_POOL_SIZE;
+ULONG64 MmSessionImageSize = MI_SESSION_IMAGE_SIZE;

-ULONG64 MmUserProbeAddress;
-PVOID MmHighestUserAddress;
-PVOID MmSystemRangeStart;
+/* Session space addresses */
+PVOID MiSessionSpaceEnd = MI_SESSION_SPACE_END; // FFFFF98000000000
+PVOID MiSessionImageEnd;    // FFFFF98000000000 = MiSessionSpaceEnd
+PVOID MiSessionImageStart;  // ?FFFFF97FFF000000 = MiSessionImageEnd - MmSessionImageSize
+PVOID MiSessionViewEnd;     // FFFFF97FFF000000
+PVOID MiSessionViewStart;   //  = MiSessionViewEnd - MmSessionViewSize
+PVOID MiSessionPoolEnd;     //  = MiSessionViewStart
+PVOID MiSessionPoolStart;   // FFFFF90000000000 = MiSessionPoolEnd - MmSessionPoolSize
+PVOID MmSessionBase;        // FFFFF90000000000 = MiSessionPoolStart

-ULONG MmNumberOfPhysicalPages, MmHighestPhysicalPage, MmLowestPhysicalPage = -1;
-
-ULONG MmBootImageSize;
-
-PPHYSICAL_MEMORY_DESCRIPTOR MmPhysicalMemoryBlock;
-
-RTL_BITMAP MiPfnBitMap;
+/* System view */
+ULONG64 MmSystemViewSize = MI_SYSTEM_VIEW_SIZE;
+PVOID MiSystemViewStart;

+ULONG64 MmMinimumNonPagedPoolSize = 256 * 1024;
+ULONG64 MmSizeOfNonPagedPoolInBytes;
+ULONG64 MmMaximumNonPagedPoolInBytes;
+ULONG64 MmMaximumNonPagedPoolPercent;
+ULONG64 MmMinAdditionNonPagedPoolPerMb = 32 * 1024;
+ULONG64 MmMaxAdditionNonPagedPoolPerMb = 400 * 1024;
+ULONG64 MmDefaultMaximumNonPagedPool = 1024 * 1024; 
 PVOID MmNonPagedSystemStart;
 PVOID MmNonPagedPoolStart;
 PVOID MmNonPagedPoolExpansionStart;
 PVOID MmNonPagedPoolEnd = MI_NONPAGED_POOL_END;

+ULONG64 MmSizeOfPagedPoolInBytes = MI_MIN_INIT_PAGED_POOLSIZE;
 PVOID MmPagedPoolStart = MI_PAGED_POOL_START;
 PVOID MmPagedPoolEnd;

-ULONG MmSizeOfPagedPoolInBytes = MI_MIN_INIT_PAGED_POOLSIZE;

-PVOID MmSessionBase;
-ULONG MmSessionSize;
+ULONG64 MmBootImageSize;
+PPHYSICAL_MEMORY_DESCRIPTOR MmPhysicalMemoryBlock;
+RTL_BITMAP MiPfnBitMap;
+ULONG MmNumberOfPhysicalPages, MmHighestPhysicalPage, MmLowestPhysicalPage = -1;
+ULONG64 MmNumberOfSystemPtes;
+PMMPTE MmSystemPagePtes;
+ULONG64 MxPfnAllocation;
+
+///////////////////////////////////////////////

 PMEMORY_ALLOCATION_DESCRIPTOR MxFreeDescriptor;
 MEMORY_ALLOCATION_DESCRIPTOR MxOldFreeDescriptor;

-PMMPTE MmSystemPagePtes;
-ULONG MxPfnAllocation;
-PVOID MiSystemViewStart;
-ULONG MmSystemViewSize;
+PFN_NUMBER MxFreePageBase;
+ULONG64 MxFreePageCount = 0;
+
+VOID
+NTAPI
+MxSetupFreePageList(IN PLOADER_PARAMETER_BLOCK LoaderBlock)
+{
+    PMEMORY_ALLOCATION_DESCRIPTOR MdBlock;
+    PLIST_ENTRY ListEntry;
+
+    /* Loop the memory descriptors */
+    for (ListEntry = LoaderBlock->MemoryDescriptorListHead.Flink;
+         ListEntry != &LoaderBlock->MemoryDescriptorListHead;
+         ListEntry = ListEntry->Flink)
+    {
+        /* Get the memory block */
+        MdBlock = CONTAINING_RECORD(ListEntry,
+                                    MEMORY_ALLOCATION_DESCRIPTOR,
+                                    ListEntry);
+
+        /* Check if this is free memory */
+        if ((MdBlock->MemoryType == LoaderFree) ||
+            (MdBlock->MemoryType == LoaderLoadedProgram) ||
+            (MdBlock->MemoryType == LoaderFirmwareTemporary) ||
+            (MdBlock->MemoryType == LoaderOsloaderStack))
+        {
+            /* Check if this is the largest memory descriptor */
+            if (MdBlock->PageCount > MxFreePageCount)
+            {
+                /* For now, it is */
+                MxFreeDescriptor = MdBlock;
+                MxFreePageBase = MdBlock->BasePage;
+                MxFreePageCount = MdBlock->PageCount;
+            }
+        }
+    }
+}
+
+PFN_NUMBER
+NTAPI
+MxGetNextPage(IN PFN_NUMBER PageCount)
+{
+    PFN_NUMBER Pfn;
+
+    /* Make sure we have enough pages */
+    if (PageCount > MxFreePageCount)
+    {
+        /* Crash the system */
+        KeBugCheckEx(INSTALL_MORE_MEMORY,
+                     MmNumberOfPhysicalPages,
+                     MxFreeDescriptor->PageCount,
+                     MxOldFreeDescriptor.PageCount,
+                     PageCount);
+    }
+
+    /* Use our lowest usable free pages */
+    Pfn = MxFreePageBase;
+    MxFreePageBase += PageCount;
+    MxFreePageCount -= PageCount;
+    return Pfn;
+}
+
+VOID
+MxMapPage(PVOID Address)
+{
+    PMMPTE Pte;
+    MMPTE TmpPte;
+
+    TmpPte.u.Long = 0;
+    TmpPte.u.Hard.Valid = 1;
+
+    /* Get a pointer to the PXE */
+    Pte = MiAddressToPxe(Address);
+    if (!Pte->u.Hard.Valid)
+    {
+        /* It's not valid, map it! */
+        TmpPte.u.Hard.PageFrameNumber = MxGetNextPage(1);
+        *Pte = TmpPte;
+    }
+
+    /* Get a pointer to the PPE */
+    Pte = MiAddressToPpe(Address);
+    if (!Pte->u.Hard.Valid)
+    {
+        /* It's not valid, map it! */
+        TmpPte.u.Hard.PageFrameNumber = MxGetNextPage(1);
+        *Pte = TmpPte;
+    }
+
+    /* Get a pointer to the PDE */
+    Pte = MiAddressToPde(Address);
+    if (!Pte->u.Hard.Valid)
+    {
+        /* It's not valid, map it! */
+        TmpPte.u.Hard.PageFrameNumber = MxGetNextPage(1);
+        *Pte = TmpPte;
+    }
+
+    /* Get a pointer to the PTE */
+    Pte = MiAddressToPte(Address);
+    if (!Pte->u.Hard.Valid)
+    {
+        /* It's not valid, map it! */
+        TmpPte.u.Hard.PageFrameNumber = MxGetNextPage(1);
+        *Pte = TmpPte;
+    }
+}
+
+VOID
+MxMapPageRange(PVOID Address, ULONG64 PageCount)
+{
+    ULONG64 i;
+
+    for (i = 0; i < PageCount; i++)
+    {
+        MxMapPage(Address);
+        Address = (PVOID)((ULONG64)Address + PAGE_SIZE);
+    }
+}
+
+
+VOID
+NTAPI
+MiArmIninializeMemoryLayout(IN PLOADER_PARAMETER_BLOCK LoaderBlock)
+{
+    /* Get the size of the boot loader's image allocations */
+    MmBootImageSize = KeLoaderBlock->Extension->LoaderPagesSpanned;
+    MmBootImageSize *= PAGE_SIZE;
+    MmBootImageSize = (MmBootImageSize + (4 * 1024 * 1024) - 1) & ~((4 * 1024 * 1024) - 1);
+    ASSERT((MmBootImageSize % (4 * 1024 * 1024)) == 0);
+
+    MiSessionSpaceEnd = (PVOID)MI_SESSION_SPACE_END;
+
+    /* This is where we will load Win32k.sys and the video driver */
+    MiSessionImageEnd = MiSessionSpaceEnd;
+    MiSessionImageStart = (PVOID)((ULONG_PTR)MiSessionImageEnd -
+                                  MmSessionImageSize);
+
+    /* The view starts right below the session working set (itself below
+     * the image area) */
+    MiSessionViewEnd = (PVOID)MI_SESSION_VIEW_END;
+    MiSessionViewStart = (PVOID)((ULONG_PTR)MiSessionViewStart -
+                                 MmSessionViewSize);
+
+    /* Session pool follows */
+    MiSessionPoolEnd = MiSessionViewStart;
+    MiSessionPoolStart = (PVOID)((ULONG_PTR)MiSessionPoolEnd -
+                                 MmSessionPoolSize);
+
+    /* And it all begins here */
+    MmSessionBase = MiSessionPoolStart;
+
+    // Sanity check that our math is correct
+    //ASSERT((ULONG_PTR)MmSessionBase + MmSessionSize == PTE_BASE);
+
+    /* System view space ends at session space, so now that we know where
+     * this is, we can compute the base address of system view space itself. */
+    MiSystemViewStart = (PVOID)((ULONG_PTR)MmSessionBase -
+                                MmSystemViewSize);
+
+    /* Use the default */
+    MmNumberOfSystemPtes = 22000;
+
+}
+
+VOID
+MiArmInitializePageTable()
+{
+    ULONG64 PageFrameOffset;
+    PMMPTE StartPte, EndPte;
+
+    /* Set CR3 for the system process */
+    PageFrameOffset = ((PMMPTE)PXE_BASE)->u.Hard.PageFrameNumber << PAGE_SHIFT;
+    PsGetCurrentProcess()->Pcb.DirectoryTableBase[0] = PageFrameOffset;
+
+    /* Clear user mode mappings in PML4 */
+    StartPte = MiAddressToPxe(0);
+    EndPte = MiAddressToPxe(MmSystemRangeStart);
+    RtlZeroMemory(StartPte, (EndPte - StartPte) * sizeof(MMPTE));
+}
+
+
+VOID
+NTAPI
+MiArmEvaluateMemoryDescriptors(IN PLOADER_PARAMETER_BLOCK LoaderBlock)
+{
+    PMEMORY_ALLOCATION_DESCRIPTOR MdBlock;
+    PLIST_ENTRY ListEntry;
+    PFN_NUMBER BasePage, LastPage, PageCount;
+
+    /* Loop the memory descriptors */
+    for (ListEntry = LoaderBlock->MemoryDescriptorListHead.Flink;
+         ListEntry != &LoaderBlock->MemoryDescriptorListHead;
+         ListEntry = ListEntry->Flink)
+    {
+        /* Get the descriptor */
+        MdBlock = CONTAINING_RECORD(ListEntry,
+                                    MEMORY_ALLOCATION_DESCRIPTOR,
+                                    ListEntry);
+
+        /* Skip pages that are not part of the PFN database */
+        if ((MdBlock->MemoryType == LoaderFirmwarePermanent) ||
+            (MdBlock->MemoryType == LoaderBBTMemory) ||
+            (MdBlock->MemoryType == LoaderHALCachedMemory) || // ???
+            (MdBlock->MemoryType == LoaderSpecialMemory))
+        {
+            continue;
+        }
+
+        /* Check if BURNMEM was used */
+        if (MdBlock->MemoryType != LoaderBad)
+        {
+            /* Count this in the total of pages */
+            MmNumberOfPhysicalPages += MdBlock->PageCount;
+        }
+
+        BasePage = MdBlock->BasePage;
+        LastPage = MdBlock->BasePage + MdBlock->PageCount - 1;
+
+        /* Check if this is the new lowest page */
+        if (BasePage < MmLowestPhysicalPage)
+        {
+            /* Update the lowest page */
+            MmLowestPhysicalPage = BasePage;
+        }
+
+        /* Check if this is the new highest page */
+        if (LastPage > MmHighestPhysicalPage)
+        {
+            /* Update the highest page */
+            MmHighestPhysicalPage = LastPage;
+        }
+
+        /* Map pages for the PFN database */
+        PageCount = (MdBlock->PageCount * sizeof(MMPFN)) / PAGE_SIZE;
+        MxMapPageRange(&MmPfnDatabase[BasePage], PageCount);
+
+        /* Zero out the pages */
+        RtlZeroMemory(&MmPfnDatabase[BasePage], PageCount * PAGE_SIZE);
+    }
+
+    /* Calculate the number of bytes, and then convert to pages */
+    MxPfnAllocation = (MmHighestPhysicalPage + 1) * sizeof(MMPFN);
+    MxPfnAllocation >>= PAGE_SHIFT;
+    MxPfnAllocation++;
+
+}
+
+VOID
+NTAPI
+MiArmPrepareNonPagedPool()
+{
+    PFN_NUMBER PageCount;
+
+    /* Check if this is a machine with less than 256MB of RAM, and no overide */
+    if ((MmNumberOfPhysicalPages <= MI_MIN_PAGES_FOR_NONPAGED_POOL_TUNING) &&
+        !(MmSizeOfNonPagedPoolInBytes))
+    {
+        /* Force the non paged pool to be 2MB so we can reduce RAM usage */
+        MmSizeOfNonPagedPoolInBytes = 2 * 1024 * 1024;
+    }
+
+    /* Check if the user gave a ridicuously large nonpaged pool RAM size */
+    if ((MmSizeOfNonPagedPoolInBytes >> PAGE_SHIFT) >
+        (MmNumberOfPhysicalPages * 7 / 8))
+    {
+        /* More than 7/8ths of RAM was dedicated to nonpaged pool, ignore! */
+        MmSizeOfNonPagedPoolInBytes = 0;
+    }
+
+    /* Check if no registry setting was set, or if the setting was too low */
+    if (MmSizeOfNonPagedPoolInBytes < MmMinimumNonPagedPoolSize)
+    {
+        /* Start with the minimum (256 KB) and add 32 KB for each MB above 4 */
+        MmSizeOfNonPagedPoolInBytes = MmMinimumNonPagedPoolSize;
+        MmSizeOfNonPagedPoolInBytes += (MmNumberOfPhysicalPages - 1024) /
+                                       256 * MmMinAdditionNonPagedPoolPerMb;
+    }
+
+    /* Check if the registy setting or our dynamic calculation was too high */
+    if (MmSizeOfNonPagedPoolInBytes > MI_MAX_INIT_NONPAGED_POOL_SIZE)
+    {
+        // Set it to the maximum */
+        MmSizeOfNonPagedPoolInBytes = MI_MAX_INIT_NONPAGED_POOL_SIZE;
+    }
+
+    /* Check if a percentage cap was set through the registry */
+    if (MmMaximumNonPagedPoolPercent)
+    {
+        /* Don't feel like supporting this right now */
+        UNIMPLEMENTED;
+    }
+
+    /* Page-align the nonpaged pool size */
+    MmSizeOfNonPagedPoolInBytes &= ~(PAGE_SIZE - 1);
+    
+    /* Now, check if there was a registry size for the maximum size */
+    if (!MmMaximumNonPagedPoolInBytes)
+    {
+        /* Start with the default (1MB) and add 400 KB for each MB above 4 */
+        MmMaximumNonPagedPoolInBytes = MmDefaultMaximumNonPagedPool;
+        MmMaximumNonPagedPoolInBytes += (MmNumberOfPhysicalPages - 1024) /
+                                         256 * MmMaxAdditionNonPagedPoolPerMb;
+    }
+    
+    /* Don't let the maximum go too high */
+    if (MmMaximumNonPagedPoolInBytes > MI_MAX_NONPAGED_POOL_SIZE)
+    {
+        /* Set it to the upper limit */
+        MmMaximumNonPagedPoolInBytes = MI_MAX_NONPAGED_POOL_SIZE;
+    }
+
+    /* Calculate the nonpaged pool expansion start region */
+    MmNonPagedPoolExpansionStart = (PVOID)((ULONG_PTR)MmNonPagedPoolEnd -
+                                  MmMaximumNonPagedPoolInBytes +
+                                  MmSizeOfNonPagedPoolInBytes);
+    MmNonPagedPoolExpansionStart = (PVOID)PAGE_ALIGN(MmNonPagedPoolExpansionStart);
+
+    DPRINT("NP Pool has been tuned to: %d bytes and %d bytes\n",
+           MmSizeOfNonPagedPoolInBytes, MmMaximumNonPagedPoolInBytes);
+
+    /* Now calculate the nonpaged system VA region, which includes the
+     * nonpaged pool expansion (above) and the system PTEs. Note that it is
+     * then aligned to a PDE boundary (4MB). */
+    MmNonPagedSystemStart = (PVOID)((ULONG_PTR)MmNonPagedPoolExpansionStart -
+                                    (MmNumberOfSystemPtes + 1) * PAGE_SIZE);
+    MmNonPagedSystemStart = (PVOID)((ULONG_PTR)MmNonPagedSystemStart &
+                                    ~((4 * 1024 * 1024) - 1));
+
+    /* Don't let it go below the minimum */
+    if (MmNonPagedSystemStart < (PVOID)MI_NON_PAGED_SYSTEM_START_MIN)
+    {
+        /* This is a hard-coded limit in the Windows NT address space */
+        MmNonPagedSystemStart = (PVOID)MI_NON_PAGED_SYSTEM_START_MIN;
+
+        /* Reduce the amount of system PTEs to reach this point */
+        MmNumberOfSystemPtes = ((ULONG_PTR)MmNonPagedPoolExpansionStart -
+                                (ULONG_PTR)MmNonPagedSystemStart) >>
+                                PAGE_SHIFT;
+        MmNumberOfSystemPtes--;
+        ASSERT(MmNumberOfSystemPtes > 1000);
+    }
+
+    /* Non paged pool comes after the PFN database */
+    MmNonPagedPoolStart = (PVOID)((ULONG_PTR)MmPfnDatabase +
+                                  (MxPfnAllocation << PAGE_SHIFT));
+
+    /* Map the nonpaged pool */
+    PageCount = (MmSizeOfNonPagedPoolInBytes + PAGE_SIZE - 1) / PAGE_SIZE;
+    MxMapPageRange(MmNonPagedPoolStart, PageCount);
+
+    /* Sanity check: make sure we have properly defined the system PTE space */
+    ASSERT(MiAddressToPte(MmNonPagedSystemStart) <
+           MiAddressToPte(MmNonPagedPoolExpansionStart));
+
+}

 NTSTATUS
 NTAPI
 MmArmInitSystem(IN ULONG Phase,
                IN PLOADER_PARAMETER_BLOCK LoaderBlock)
 {
-    UNIMPLEMENTED;
-    return STATUS_NOT_IMPLEMENTED;
+    if (Phase == 0)
+    {
+        /* Get a continuous range of physical pages */
+        MxSetupFreePageList(LoaderBlock);
+
+        /* Initialize the memory layout */
+        MiArmIninializeMemoryLayout(LoaderBlock);
+        DPRINT1("MmArmInitSystem 3\n");
+
+        /* Loop descriptors and prepare PFN database */
+        MiArmEvaluateMemoryDescriptors(LoaderBlock);
+        DPRINT1("MmArmInitSystem 4\n");
+
+        MiArmInitializePageTable();
+        DPRINT1("MmArmInitSystem 5\n");
+
+        /* Configure size of the non paged pool */
+        MiArmPrepareNonPagedPool();
+
+        /* Initialize the ARM3 nonpaged pool */
+        MiInitializeArmPool();
+
+        /* Update the memory descriptor, to make sure the pages we used
+           won't get inserted into the PFN database */
+        MxOldFreeDescriptor = *MxFreeDescriptor;
+        MxFreeDescriptor->BasePage = MxFreePageBase;
+        MxFreeDescriptor->PageCount = MxFreePageCount;
+    }
+    else if (Phase == 1)
+    {
+        /* The PFN database was created, restore the free descriptor */
+        *MxFreeDescriptor = MxOldFreeDescriptor;
+
+
+    }
+
+    return STATUS_SUCCESS;
 }