headers/private/graphics/intel_extreme/AreaKeeper.h

   1 /*
   2  * Copyright 2006-2008, Haiku, Inc. All Rights Reserved.
   3  * Distributed under the terms of the MIT License.
   4  *
   5  * Authors:
   6  *              Axel Dörfler, axeld@pinc-software.de
   7  */
   8 #ifndef AREA_KEEPER_H
   9 #define AREA_KEEPER_H
  10
  11
  12 #include <KernelExport.h>
  13 #include <OS.h>
  14
  15 #include <util/kernel_cpp.h>
  16
  17
  18 class AreaKeeper {
  19         public:
  20                 AreaKeeper();
  21                 ~AreaKeeper();
  22
  23                 area_id Create(const char *name, void **_virtualAddress, uint32 spec,
  24                         size_t size, uint32 lock, uint32 protection);
  25                 area_id Map(const char *name, phys_addr_t physicalAddress,
  26                         size_t numBytes, uint32 spec, uint32 protection,
  27                         void **_virtualAddress);
  28
  29                 status_t InitCheck() { return fArea < B_OK ? (status_t)fArea : B_OK; }
  30                 void Detach();
  31
  32         private:
  33                 area_id fArea;
  34 };
  35
  36
  37 AreaKeeper::AreaKeeper()
  38         :
  39         fArea(-1)
  40 {
  41 }
  42
  43
  44 AreaKeeper::~AreaKeeper()
  45 {
  46         if (fArea >= B_OK)
  47                 delete_area(fArea);
  48 }
  49
  50
  51 area_id
  52 AreaKeeper::Create(const char *name, void **_virtualAddress, uint32 spec,
  53         size_t size, uint32 lock, uint32 protection)
  54 {
  55         fArea = create_area(name, _virtualAddress, spec, size, lock, protection);
  56         return fArea;
  57 }
  58
  59
  60 area_id
  61 AreaKeeper::Map(const char *name, phys_addr_t physicalAddress, size_t numBytes,
  62         uint32 spec, uint32 protection, void **_virtualAddress)
  63 {
  64         fArea = map_physical_memory(name, physicalAddress, numBytes, spec,
  65                 protection, _virtualAddress);
  66         return fArea;
  67 }
  68
  69
  70 void
  71 AreaKeeper::Detach()
  72 {
  73         fArea = -1;
  74 }
  75
  76 #endif  // AREA_KEEPER_H