Revert "get rid of MemoryHeapPmem"

This reverts commit 7a7524810a0950c1c2b18014a8f1c637275165c4 and
makes MemoryHeapPmem conditioned to BOARD_NEEDS_MEMORYHEAPPMEM

Change-Id: I2f38340984ba87d6970d17ec944e3faded4132c8

1 files changed, 79 insertions, 0 deletions

diff --git a/include/binder/MemoryHeapPmem.h b/include/binder/MemoryHeapPmem.h
new file mode 100644
index 0000000..e1660c4
--- /dev/null
+++ b/include/binder/MemoryHeapPmem.h
@@ -0,0 +1,79 @@
+/*
+ * Copyright (C) 2008 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ANDROID_MEMORY_HEAP_PMEM_H
+#define ANDROID_MEMORY_HEAP_PMEM_H
+
+#include <stdlib.h>
+#include <stdint.h>
+
+#include <binder/MemoryHeapBase.h>
+#include <binder/IMemory.h>
+#include <utils/SortedVector.h>
+#include <utils/threads.h>
+
+namespace android {
+
+class MemoryHeapBase;
+
+// ---------------------------------------------------------------------------
+
+class MemoryHeapPmem : public MemoryHeapBase
+{
+public:
+    class MemoryPmem : public BnMemory {
+    public:
+        MemoryPmem(const sp<MemoryHeapPmem>& heap);
+        ~MemoryPmem();
+    protected:
+        const sp<MemoryHeapPmem>&  getHeap() const { return mClientHeap; }
+    private:
+        friend class MemoryHeapPmem;
+        virtual void revoke() = 0;
+        sp<MemoryHeapPmem>  mClientHeap;
+    };
+    
+    MemoryHeapPmem(const sp<MemoryHeapBase>& pmemHeap, uint32_t flags = 0);
+    ~MemoryHeapPmem();
+
+    /* HeapInterface additions */
+    virtual sp<IMemory> mapMemory(size_t offset, size_t size);
+
+    /* make the whole heap visible (you know who you are) */
+    virtual status_t slap();
+    
+    /* hide (revoke) the whole heap (the client will see the garbage page) */
+    virtual status_t unslap();
+    
+    /* revoke all allocations made by this heap */
+    virtual void revoke();
+
+private:
+    /* use this to create your own IMemory for mapMemory */
+    virtual sp<MemoryPmem> createMemory(size_t offset, size_t size);
+    void remove(const wp<MemoryPmem>& memory);
+
+private:
+    sp<MemoryHeapBase>              mParentHeap;
+    mutable Mutex                   mLock;
+    SortedVector< wp<MemoryPmem> >  mAllocations;
+};
+
+
+// ---------------------------------------------------------------------------
+}; // namespace android
+
+#endif // ANDROID_MEMORY_HEAP_PMEM_H