src/system/kernel/vm/VMDeviceCache.cpp

   1 /*
   2  * Copyright 2004-2007, Axel Dörfler, axeld@pinc-software.de.
   3  * Distributed under the terms of the MIT License.
   4  *
   5  * Copyright 2001-2002, Travis Geiselbrecht. All rights reserved.
   6  * Distributed under the terms of the NewOS License.
   7  */
   8
   9
  10 #include "VMDeviceCache.h"
  11
  12 #include <slab/Slab.h>
  13
  14
  15 status_t
  16 VMDeviceCache::Init(addr_t baseAddress, uint32 allocationFlags)
  17 {
  18         fBaseAddress = baseAddress;
  19         return VMCache::Init(CACHE_TYPE_DEVICE, allocationFlags);
  20 }
  21
  22
  23 status_t
  24 VMDeviceCache::Read(off_t offset, const generic_io_vec *vecs, size_t count,
  25         uint32 flags, generic_size_t *_numBytes)
  26 {
  27         panic("device_store: read called. Invalid!\n");
  28         return B_ERROR;
  29 }
  30
  31
  32 status_t
  33 VMDeviceCache::Write(off_t offset, const generic_io_vec* vecs, size_t count,
  34         uint32 flags, generic_size_t* _numBytes)
  35 {
  36         // no place to write, this will cause the page daemon to skip this store
  37         return B_OK;
  38 }
  39
  40
  41 void
  42 VMDeviceCache::DeleteObject()
  43 {
  44         object_cache_delete(gDeviceCacheObjectCache, this);
  45 }