headers/private/graphics/radeon_hd/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, addr_t physicalAddress, size_t numBytes,
  26                         uint32 spec, uint32 protection, void **_virtualAddress);
  27
  28                 status_t InitCheck() { return fArea < B_OK ? (status_t)fArea : B_OK; }
  29                 void Detach();
  30
  31         private:
  32                 area_id fArea;
  33 };
  34
  35
  36 AreaKeeper::AreaKeeper()
  37         :
  38         fArea(-1)
  39 {
  40 }
  41
  42
  43 AreaKeeper::~AreaKeeper()
  44 {
  45         if (fArea >= B_OK)
  46                 delete_area(fArea);
  47 }
  48
  49
  50 area_id
  51 AreaKeeper::Create(const char *name, void **_virtualAddress, uint32 spec,
  52         size_t size, uint32 lock, uint32 protection)
  53 {
  54         fArea = create_area(name, _virtualAddress, spec, size, lock, protection);
  55         return fArea;
  56 }
  57
  58
  59 area_id
  60 AreaKeeper::Map(const char *name, addr_t physicalAddress, size_t numBytes,
  61         uint32 spec, uint32 protection, void **_virtualAddress)
  62 {
  63         fArea = map_physical_memory(name, physicalAddress, numBytes, spec,
  64                 protection, _virtualAddress);
  65         return fArea;
  66 }
  67
  68
  69 void
  70 AreaKeeper::Detach()
  71 {
  72         fArea = -1;
  73 }
  74
  75 #endif  // AREA_KEEPER_H