Kernel/x86 - Implemented VFS node in PMM, debugging some other parts

[tpg/acess2.git] / Kernel / arch / x86 / mm_phys.c

diff --git a/Kernel/arch/x86/mm_phys.c b/Kernel/arch/x86/mm_phys.c
index 78755d9..fc71bd9 100644 (file)
--- a/Kernel/arch/x86/mm_phys.c
+++ b/Kernel/arch/x86/mm_phys.c
@@ -31,6 +31,7 @@ Uint64        giLastPossibleFree = 0; // Last possible free page (before all pages are
 Uint32 gaSuperBitmap[1024];    // Blocks of 1024 Pages
 Uint32 gaPageBitmap[1024*1024/32];     // Individual pages
  int   *gaPageReferences;
+void   **gaPageNodes = (void*)MM_PAGENODE_BASE;
 #define REFENT_PER_PAGE        (0x1000/sizeof(gaPageReferences[0]))
 
 // === CODE ===
@@ -471,6 +472,12 @@ void MM_DerefPhys(tPAddr PAddr)
                if(gaPageBitmap[ PAddr / 32 ] == 0)
                        gaSuperBitmap[ PAddr >> 10 ] &= ~(1 << ((PAddr >> 5)&31));
        }
+
+       if( MM_GetPhysAddr( (tVAddr) &gaPageNodes[PAddr] ) )
+       {
+               gaPageNodes[PAddr] = NULL;
+               // TODO: Free Node Page when fully unused
+       }
        
        // Release spinlock
        Mutex_Release( &glPhysAlloc );
@@ -494,3 +501,40 @@ int MM_GetRefCount(tPAddr PAddr)
        return gaPageReferences[ PAddr ];
 }
 
+int MM_SetPageNode(tPAddr PAddr, void *Node)
+{
+       tVAddr  block_addr;
+       
+       if( MM_GetRefCount(PAddr) == 0 )        return 1;
+        
+       PAddr /= PAGE_SIZE;
+
+       block_addr = (tVAddr) &gaPageNodes[PAddr];
+       block_addr &= ~(PAGE_SIZE-1);
+       
+       if( !MM_GetPhysAddr( block_addr ) )
+       {
+               if( !MM_Allocate( block_addr ) ) {
+                       Log_Warning("PMem", "Unable to allocate Node page");
+                       return -1;
+               }
+               memset( (void*)block_addr, 0, PAGE_SIZE );
+       }
+
+       gaPageNodes[PAddr] = Node;
+       return 0;
+}
+
+int MM_GetPageNode(tPAddr PAddr, void **Node)
+{
+       if( MM_GetRefCount(PAddr) == 0 ) {
+               return 1;
+       }
+       if( !MM_GetPhysAddr( (tVAddr) &gaPageNodes[PAddr] ) ) {
+               *Node = NULL;
+               return 0;
+       }
+       *Node = gaPageNodes[PAddr];
+       return 0;
+}
+