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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_BASE_H
     18 #define ANDROID_MEMORY_HEAP_BASE_H
     19 
     20 #include <stdlib.h>
     21 #include <stdint.h>
     22 
     23 #include <binder/IMemory.h>
     24 
     25 
     26 namespace android {
     27 
     28 // ---------------------------------------------------------------------------
     29 
     30 class MemoryHeapBase : public virtual BnMemoryHeap
     31 {
     32 public:
     33     enum {
     34         READ_ONLY = IMemoryHeap::READ_ONLY,
     35         // memory won't be mapped locally, but will be mapped in the remote
     36         // process.
     37         DONT_MAP_LOCALLY = 0x00000100,
     38         NO_CACHING = 0x00000200
     39     };
     40 
     41     /*
     42      * maps the memory referenced by fd. but DOESN'T take ownership
     43      * of the filedescriptor (it makes a copy with dup()
     44      */
     45     MemoryHeapBase(int fd, size_t size, uint32_t flags = 0, uint32_t offset = 0);
     46 
     47     /*
     48      * maps memory from the given device
     49      */
     50     MemoryHeapBase(const char* device, size_t size = 0, uint32_t flags = 0);
     51 
     52     /*
     53      * maps memory from ashmem, with the given name for debugging
     54      */
     55     MemoryHeapBase(size_t size, uint32_t flags = 0, char const* name = NULL);
     56 
     57     virtual ~MemoryHeapBase();
     58 
     59     /* implement IMemoryHeap interface */
     60     virtual int         getHeapID() const;
     61     virtual void*       getBase() const;
     62     virtual size_t      getSize() const;
     63     virtual uint32_t    getFlags() const;
     64     virtual uint32_t      getOffset() const;
     65 
     66     const char*         getDevice() const;
     67 
     68     /* this closes this heap -- use carefully */
     69     void dispose();
     70 
     71     /* this is only needed as a workaround, use only if you know
     72      * what you are doing */
     73     status_t setDevice(const char* device) {
     74         if (mDevice == 0)
     75             mDevice = device;
     76         return mDevice ? NO_ERROR : ALREADY_EXISTS;
     77     }
     78 
     79 protected:
     80             MemoryHeapBase();
     81     // init() takes ownership of fd
     82     status_t init(int fd, void *base, int size,
     83             int flags = 0, const char* device = NULL);
     84 
     85 private:
     86     status_t mapfd(int fd, size_t size, uint32_t offset = 0);
     87 
     88     int         mFD;
     89     size_t      mSize;
     90     void*       mBase;
     91     uint32_t    mFlags;
     92     const char* mDevice;
     93     bool        mNeedUnmap;
     94     uint32_t    mOffset;
     95 };
     96 
     97 // ---------------------------------------------------------------------------
     98 }; // namespace android
     99 
    100 #endif // ANDROID_MEMORY_HEAP_BASE_H
    101