src/system/kernel/vm/VMAnonymousNoSwapCache.h

   1 /*
   2  * Copyright 2008-2011, Ingo Weinhold, ingo_weinhold@gmx.de.
   3  * Copyright 2004-2007, 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_VM_STORE_ANONYMOUS_NO_SWAP_H
  10 #define _KERNEL_VM_STORE_ANONYMOUS_NO_SWAP_H
  11
  12
  13 #include <vm/VMCache.h>
  14
  15
  16 class VMAnonymousNoSwapCache : public VMCache {
  17 public:
  18         virtual                                         ~VMAnonymousNoSwapCache();
  19
  20                         status_t                        Init(bool canOvercommit,
  21                                                                         int32 numPrecommittedPages,
  22                                                                         int32 numGuardPages,
  23                                                                         uint32 allocationFlags);
  24
  25         virtual status_t                        Commit(off_t size, int priority);
  26         virtual bool                            HasPage(off_t offset);
  27
  28         virtual int32                           GuardSize()     { return fGuardedSize; }
  29
  30         virtual status_t                        Read(off_t offset, const generic_io_vec *vecs,
  31                                                                          size_t count,uint32 flags,
  32                                                                          generic_size_t *_numBytes);
  33         virtual status_t                        Write(off_t offset, const generic_io_vec *vecs,
  34                                                                           size_t count, uint32 flags,
  35                                                                           generic_size_t *_numBytes);
  36
  37         virtual status_t                        Fault(struct VMAddressSpace* aspace,
  38                                                                         off_t offset);
  39
  40         virtual void                            MergeStore(VMCache* source);
  41
  42 protected:
  43         virtual void                            DeleteObject();
  44
  45 private:
  46                         bool                            fCanOvercommit;
  47                         bool                            fHasPrecommitted;
  48                         uint8                           fPrecommittedPages;
  49                         int32                           fGuardedSize;
  50 };
  51
  52
  53 #endif  /* _KERNEL_VM_STORE_ANONYMOUS_NO_SWAP_H */