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30 * Disk Image Interfaces
33 #ifndef __DISK_IMAGE_HH__
34 #define __DISK_IMAGE_HH__
38 #include "base/hashmap.hh"
39 #include "sim/sim_object.hh"
41 #define SectorSize (512)
44 * Basic interface for accessing a disk image.
46 class DiskImage : public SimObject
52 DiskImage(const std::string &name) : SimObject(name), initialized(false) {}
53 virtual ~DiskImage() {}
55 virtual off_t size() const = 0;
57 virtual off_t read(uint8_t *data, off_t offset) const = 0;
58 virtual off_t write(const uint8_t *data, off_t offset) = 0;
62 * Specialization for accessing a raw disk image
64 class RawDiskImage : public DiskImage
67 mutable std::fstream stream;
70 mutable off_t disk_size;
73 RawDiskImage(const std::string &name, const std::string &filename,
78 void open(const std::string &filename, bool rd_only = false);
80 virtual off_t size() const;
82 virtual off_t read(uint8_t *data, off_t offset) const;
83 virtual off_t write(const uint8_t *data, off_t offset);
87 * Specialization for accessing a copy-on-write disk image layer.
88 * A copy-on-write(COW) layer must be stacked on top of another disk
89 * image layer this layer can be another CowDiskImage, or a
92 * This object is designed to provide a mechanism for persistant
93 * changes to a main disk image, or to provide a place for temporary
94 * changes to the image to take place that later may be thrown away.
96 class CowDiskImage : public DiskImage
99 static const int VersionMajor;
100 static const int VersionMinor;
104 uint8_t data[SectorSize];
106 typedef m5::hash_map<uint64_t, Sector *> SectorTable;
109 std::string filename;
114 CowDiskImage(const std::string &name, DiskImage *kid, int hash_size);
115 CowDiskImage(const std::string &name, DiskImage *kid, int hash_size,
116 const std::string &filename, bool read_only);
119 void init(int hash_size);
120 bool open(const std::string &file);
122 void save(const std::string &file);
124 void serialize(std::ostream &os);
125 void unserialize(Checkpoint *cp, const std::string §ion);
127 virtual off_t size() const;
129 virtual off_t read(uint8_t *data, off_t offset) const;
130 virtual off_t write(const uint8_t *data, off_t offset);
133 #endif // __DISK_IMAGE_HH__