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      1 /*
      2  * Copyright (C) 2008 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 #ifndef ANDROID_MEMORY_HEAP_PMEM_H
     18 #define ANDROID_MEMORY_HEAP_PMEM_H
     19 
     20 #include <stdlib.h>
     21 #include <stdint.h>
     22 
     23 #include <binder/MemoryHeapBase.h>
     24 #include <binder/IMemory.h>
     25 #include <utils/SortedVector.h>
     26 #include <utils/threads.h>
     27 
     28 namespace android {
     29 
     30 class MemoryHeapBase;
     31 
     32 // ---------------------------------------------------------------------------
     33 
     34 class MemoryHeapPmem : public MemoryHeapBase
     35 {
     36 public:
     37     class MemoryPmem : public BnMemory {
     38     public:
     39         MemoryPmem(const sp<MemoryHeapPmem>& heap);
     40         ~MemoryPmem();
     41     protected:
     42         const sp<MemoryHeapPmem>&  getHeap() const { return mClientHeap; }
     43     private:
     44         friend class MemoryHeapPmem;
     45         virtual void revoke() = 0;
     46         sp<MemoryHeapPmem>  mClientHeap;
     47     };
     48 
     49     MemoryHeapPmem(const sp<MemoryHeapBase>& pmemHeap, uint32_t flags = 0);
     50     ~MemoryHeapPmem();
     51 
     52     /* HeapInterface additions */
     53     virtual sp<IMemory> mapMemory(size_t offset, size_t size);
     54 
     55     /* make the whole heap visible (you know who you are) */
     56     virtual status_t slap();
     57 
     58     /* hide (revoke) the whole heap (the client will see the garbage page) */
     59     virtual status_t unslap();
     60 
     61     /* revoke all allocations made by this heap */
     62     virtual void revoke();
     63 
     64 private:
     65     /* use this to create your own IMemory for mapMemory */
     66     virtual sp<MemoryPmem> createMemory(size_t offset, size_t size);
     67     void remove(const wp<MemoryPmem>& memory);
     68 
     69 private:
     70     sp<MemoryHeapBase>              mParentHeap;
     71     mutable Mutex                   mLock;
     72     SortedVector< wp<MemoryPmem> >  mAllocations;
     73 };
     74 
     75 
     76 // ---------------------------------------------------------------------------
     77 }; // namespace android
     78 
     79 #endif // ANDROID_MEMORY_HEAP_PMEM_H
     80