src/system/kernel/arch/x86/paging/X86PagingStructures.h

   1 /*
   2  * Copyright 2010, Ingo Weinhold, ingo_weinhold@gmx.de.
   3  * Copyright 2005-2009, Axel Dörfler, axeld@pinc-software.de.
   4  * Distributed under the terms of the MIT License.
   5  *
   6  * Copyright 2001-2002, Travis Geiselbrecht. All rights reserved.
   7  * Distributed under the terms of the NewOS License.
   8  */
   9 #ifndef KERNEL_ARCH_X86_PAGING_X86_PAGING_STRUCTURES_H
  10 #define KERNEL_ARCH_X86_PAGING_X86_PAGING_STRUCTURES_H
  11
  12
  13 #include <SupportDefs.h>
  14
  15 #include <heap.h>
  16
  17 #include <smp.h>
  18
  19
  20 struct X86PagingStructures : DeferredDeletable {
  21         phys_addr_t                                     pgdir_phys;
  22         int32                                           ref_count;
  23         CPUSet                                          active_on_cpus;
  24                 // mask indicating on which CPUs the map is currently used
  25
  26                                                                 X86PagingStructures();
  27         virtual                                         ~X86PagingStructures();
  28
  29         inline  void                            AddReference();
  30         inline  void                            RemoveReference();
  31
  32         virtual void                            Delete() = 0;
  33 };
  34
  35
  36 inline void
  37 X86PagingStructures::AddReference()
  38 {
  39         atomic_add(&ref_count, 1);
  40 }
  41
  42
  43 inline void
  44 X86PagingStructures::RemoveReference()
  45 {
  46         if (atomic_add(&ref_count, -1) == 1)
  47                 Delete();
  48 }
  49
  50
  51 #endif  // KERNEL_ARCH_X86_PAGING_X86_PAGING_STRUCTURES_H