Move memory layout initialization to architecture-specific code

xtoskrnl/mm/i686/mmgr.cc

@@ -0,0 +1,55 @@
+/**
+ * PROJECT:         ExectOS
+ * COPYRIGHT:       See COPYING.md in the top level directory
+ * FILE:            xtoskrnl/mm/i686/mmgr.cc
+ * DESCRIPTION:     Memory Manager
+ * DEVELOPERS:      Aiken Harris <harraiken91@gmail.com>
+ */
+
+#include <xtos.hh>
+
+
+/**
+ * Initializes the kernel's virtual memory layout.
+ *
+ * @return This routine does not return any value.
+ *
+ * @since XT 1.0
+ */
+XTAPI
+VOID
+MM::Manager::InitializeMemoryLayout(VOID)
+{
+    ULONG PhysicalPages;
+
+    /* Not finished yet */
+    UNIMPLEMENTED;
+
+    /* Define the number of system PTEs */
+    NumberOfSystemPtes = MM_DEFAULT_NUMBER_SYSTEM_PTES;
+
+    /* Retrieve the number of physical pages */
+    PhysicalPages = MM::Pfn::GetNumberOfPhysicalPages();
+
+    /* Verify the number of physical pages */
+    if(PhysicalPages < 8192)
+    {
+        /* Less than 32MiB of physical memory (8192 pages), use the minimum number of system PTEs */
+        NumberOfSystemPtes = MM_MINIMUM_NUMBER_SYSTEM_PTES;
+    }
+    else if(PhysicalPages > 32768)
+    {
+        /* More than 128MiB of physical memory (32768 pages), use the maximum number of system PTEs */
+        NumberOfSystemPtes = MM_MAXIMUM_NUMBER_SYSTEM_PTES;
+    }
+
+    /* Check if 3-level paging (PAE) is enabled */
+    if(MM::Paging::GetXpaStatus())
+    {
+        /* Configure memory layout for 3-level paging, using 36bit address space and providing a 64 GB address space */
+    }
+    else
+    {
+        /* Configure memory layout for 2-level paging, using 32bit address space and providing a 4 GB address space */
+    }
+}