From 8ec5fc66321549ebda555e7c16ddaf158b021d2b Mon Sep 17 00:00:00 2001 From: Andreas Sandberg Date: Thu, 10 Dec 2015 10:35:23 +0000 Subject: dev: Move storage devices to src/dev/storage/ Move the IDE controller and the disk implementations to src/dev/storage. --HG-- rename : src/dev/DiskImage.py => src/dev/storage/DiskImage.py rename : src/dev/Ide.py => src/dev/storage/Ide.py rename : src/dev/SimpleDisk.py => src/dev/storage/SimpleDisk.py rename : src/dev/disk_image.cc => src/dev/storage/disk_image.cc rename : src/dev/disk_image.hh => src/dev/storage/disk_image.hh rename : src/dev/ide_atareg.h => src/dev/storage/ide_atareg.h rename : src/dev/ide_ctrl.cc => src/dev/storage/ide_ctrl.cc rename : src/dev/ide_ctrl.hh => src/dev/storage/ide_ctrl.hh rename : src/dev/ide_disk.cc => src/dev/storage/ide_disk.cc rename : src/dev/ide_disk.hh => src/dev/storage/ide_disk.hh rename : src/dev/ide_wdcreg.h => src/dev/storage/ide_wdcreg.h rename : src/dev/simple_disk.cc => src/dev/storage/simple_disk.cc rename : src/dev/simple_disk.hh => src/dev/storage/simple_disk.hh --- src/dev/storage/disk_image.hh | 157 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 157 insertions(+) create mode 100644 src/dev/storage/disk_image.hh (limited to 'src/dev/storage/disk_image.hh') diff --git a/src/dev/storage/disk_image.hh b/src/dev/storage/disk_image.hh new file mode 100644 index 000000000..43e6adf5e --- /dev/null +++ b/src/dev/storage/disk_image.hh @@ -0,0 +1,157 @@ +/* + * Copyright (c) 2001-2005 The Regents of The University of Michigan + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer; + * redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution; + * neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Authors: Nathan Binkert + */ + +/** @file + * Disk Image Interfaces + */ + +#ifndef __DEV_STORAGE_DISK_IMAGE_HH__ +#define __DEV_STORAGE_DISK_IMAGE_HH__ + +#include +#include + +#include "params/CowDiskImage.hh" +#include "params/DiskImage.hh" +#include "params/RawDiskImage.hh" +#include "sim/sim_object.hh" + +#define SectorSize (512) + +/** + * Basic interface for accessing a disk image. + */ +class DiskImage : public SimObject +{ + protected: + bool initialized; + + public: + typedef DiskImageParams Params; + DiskImage(const Params *p) : SimObject(p), initialized(false) {} + virtual ~DiskImage() {} + + virtual std::streampos size() const = 0; + + virtual std::streampos read(uint8_t *data, + std::streampos offset) const = 0; + virtual std::streampos write(const uint8_t *data, + std::streampos offset) = 0; +}; + +/** + * Specialization for accessing a raw disk image + */ +class RawDiskImage : public DiskImage +{ + protected: + mutable std::fstream stream; + std::string file; + bool readonly; + mutable std::streampos disk_size; + + public: + typedef RawDiskImageParams Params; + RawDiskImage(const Params *p); + ~RawDiskImage(); + + void close(); + void open(const std::string &filename, bool rd_only = false); + + virtual std::streampos size() const; + + virtual std::streampos read(uint8_t *data, std::streampos offset) const; + virtual std::streampos write(const uint8_t *data, std::streampos offset); +}; + +/** + * Specialization for accessing a copy-on-write disk image layer. + * A copy-on-write(COW) layer must be stacked on top of another disk + * image layer this layer can be another CowDiskImage, or a + * RawDiskImage. + * + * This object is designed to provide a mechanism for persistant + * changes to a main disk image, or to provide a place for temporary + * changes to the image to take place that later may be thrown away. + */ +class CowDiskImage : public DiskImage +{ + public: + static const uint32_t VersionMajor; + static const uint32_t VersionMinor; + + protected: + struct Sector { + uint8_t data[SectorSize]; + }; + typedef std::unordered_map SectorTable; + + protected: + std::string filename; + DiskImage *child; + SectorTable *table; + + public: + typedef CowDiskImageParams Params; + CowDiskImage(const Params *p); + ~CowDiskImage(); + + void initSectorTable(int hash_size); + bool open(const std::string &file); + void save() const; + void save(const std::string &file) const; + void writeback(); + + void serialize(CheckpointOut &cp) const override; + void unserialize(CheckpointIn &cp) override; + + std::streampos size() const override; + + std::streampos read(uint8_t *data, std::streampos offset) const override; + std::streampos write(const uint8_t *data, std::streampos offset) override; +}; + +void SafeRead(std::ifstream &stream, void *data, int count); + +template +void SafeRead(std::ifstream &stream, T &data); + +template +void SafeReadSwap(std::ifstream &stream, T &data); + +void SafeWrite(std::ofstream &stream, const void *data, int count); + +template +void SafeWrite(std::ofstream &stream, const T &data); + +template +void SafeWriteSwap(std::ofstream &stream, const T &data); + +#endif // __DEV_STORAGE_DISK_IMAGE_HH__ -- cgit v1.2.3