96 lines
2.2 KiB
C++
96 lines
2.2 KiB
C++
/*******************************************************************************
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Copyright(C) Jonas 'Sortie' Termansen 2011, 2012.
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This file is part of Sortix.
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Sortix is free software: you can redistribute it and/or modify it under the
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terms of the GNU General Public License as published by the Free Software
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Foundation, either version 3 of the License, or (at your option) any later
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version.
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Sortix is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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details.
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You should have received a copy of the GNU General Public License along with
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Sortix. If not, see <http://www.gnu.org/licenses/>.
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ata.h
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Allowes access to block devices over ATA PIO.
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*******************************************************************************/
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#ifndef SORTIX_ATA_H
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#define SORTIX_ATA_H
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#include <sortix/kernel/kthread.h>
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#include <sortix/kernel/refcount.h>
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namespace Sortix {
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class Descriptor;
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class ATABus;
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class ATADrive;
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class ATABus
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{
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public:
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ATABus(uint16_t portoffset, uint16_t altport);
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~ATABus();
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public:
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ATADrive* Instatiate(unsigned driveid);
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bool SelectDrive(unsigned driveid);
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private:
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unsigned curdriveid;
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uint16_t iobase;
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uint16_t altport;
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};
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class ATADrive
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{
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public:
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off_t GetSectorSize();
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off_t GetNumSectors();
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off_t GetSize() { return GetSectorSize() * GetNumSectors(); }
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bool ReadSector(off_t sector, uint8_t* dest);
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bool WriteSector(off_t sector, const uint8_t* src);
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size_t Read(off_t byteoffset, uint8_t* dest, size_t numbytes);
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size_t Write(off_t byteoffset, const uint8_t* src, size_t numbytes);
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public:
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ATADrive(ATABus* bus, unsigned driveid, uint16_t portoffset, uint16_t altport);
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~ATADrive();
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private:
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void Initialize();
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bool PrepareIO(bool write, off_t sector);
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private:
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kthread_mutex_t atalock;
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unsigned driveid;
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uint16_t meta[256];
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uint16_t iobase;
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uint16_t altport;
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ATABus* bus;
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bool lba48;
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size_t sectorsize;
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off_t numsectors;
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};
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namespace ATA {
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void Init(const char* devpath, Ref<Descriptor> slashdev);
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ATABus* CreateBus(uint16_t portoffset, uint16_t altport);
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} // namespace ATA
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} // namespace Sortix
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#endif
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