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28 * Authors: Nathan Binkert
32 * Disk Image Interfaces
35 #ifndef __DISK_IMAGE_HH__
36 #define __DISK_IMAGE_HH__
39 #include <unordered_map>
41 #include "params/CowDiskImage.hh"
42 #include "params/DiskImage.hh"
43 #include "params/RawDiskImage.hh"
44 #include "sim/sim_object.hh"
46 #define SectorSize (512)
49 * Basic interface for accessing a disk image.
51 class DiskImage : public SimObject
57 typedef DiskImageParams Params;
58 DiskImage(const Params *p) : SimObject(p), initialized(false) {}
59 virtual ~DiskImage() {}
61 virtual std::streampos size() const = 0;
63 virtual std::streampos read(uint8_t *data,
64 std::streampos offset) const = 0;
65 virtual std::streampos write(const uint8_t *data,
66 std::streampos offset) = 0;
70 * Specialization for accessing a raw disk image
72 class RawDiskImage : public DiskImage
75 mutable std::fstream stream;
78 mutable std::streampos disk_size;
81 typedef RawDiskImageParams Params;
82 RawDiskImage(const Params *p);
86 void open(const std::string &filename, bool rd_only = false);
88 virtual std::streampos size() const;
90 virtual std::streampos read(uint8_t *data, std::streampos offset) const;
91 virtual std::streampos write(const uint8_t *data, std::streampos offset);
95 * Specialization for accessing a copy-on-write disk image layer.
96 * A copy-on-write(COW) layer must be stacked on top of another disk
97 * image layer this layer can be another CowDiskImage, or a
100 * This object is designed to provide a mechanism for persistant
101 * changes to a main disk image, or to provide a place for temporary
102 * changes to the image to take place that later may be thrown away.
104 class CowDiskImage : public DiskImage
107 static const uint32_t VersionMajor;
108 static const uint32_t VersionMinor;
112 uint8_t data[SectorSize];
114 typedef std::unordered_map<uint64_t, Sector *> SectorTable;
117 std::string filename;
122 typedef CowDiskImageParams Params;
123 CowDiskImage(const Params *p);
126 void initSectorTable(int hash_size);
127 bool open(const std::string &file);
129 void save(const std::string &file) const;
132 void serialize(CheckpointOut &cp) const override;
133 void unserialize(CheckpointIn &cp) override;
135 std::streampos size() const override;
137 std::streampos read(uint8_t *data, std::streampos offset) const override;
138 std::streampos write(const uint8_t *data, std::streampos offset) override;
141 void SafeRead(std::ifstream &stream, void *data, int count);
144 void SafeRead(std::ifstream &stream, T &data);
147 void SafeReadSwap(std::ifstream &stream, T &data);
149 void SafeWrite(std::ofstream &stream, const void *data, int count);
152 void SafeWrite(std::ofstream &stream, const T &data);
155 void SafeWriteSwap(std::ofstream &stream, const T &data);
157 #endif // __DISK_IMAGE_HH__