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// Copyright (C) 2006 Google Inc.
//
// 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.
// memory_region.h: Access to memory regions.
//
// A MemoryRegion provides virtual access to a range of memory. It is an
// abstraction allowing the actual source of memory to be independent of
// methods which need to access a virtual memory space.
//
// Author: Mark Mentovai
#ifndef PROCESSOR_MEMORY_REGION_H__
#define PROCESSOR_MEMORY_REGION_H__
#include "google/airbag_types.h"
namespace google_airbag {
class MemoryRegion {
public:
virtual ~MemoryRegion() {}
// The base address of this memory region.
virtual u_int64_t GetBase() = 0;
// The size of this memory region.
virtual u_int32_t GetSize() = 0;
// Access to data of various sizes within the memory region. address
// is a pointer to read, and it must lie within the memory region as
// defined by its base address and size. The location pointed to by
// value is set to the value at address. Byte-swapping is performed
// if necessary so that the value is appropriate for the running
// program. Returns true on success. Fails and returns false if address
// is out of the region's bounds (after considering the width of value),
// or for other types of errors.
virtual bool GetMemoryAtAddress(u_int64_t address, u_int8_t* value) = 0;
virtual bool GetMemoryAtAddress(u_int64_t address, u_int16_t* value) = 0;
virtual bool GetMemoryAtAddress(u_int64_t address, u_int32_t* value) = 0;
virtual bool GetMemoryAtAddress(u_int64_t address, u_int64_t* value) = 0;
};
} // namespace google_airbag
#endif // PROCESSOR_MEMORY_REGION_H__
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