mirror of
https://gitlab.com/sortix/sortix.git
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332 lines
6.8 KiB
C++
332 lines
6.8 KiB
C++
/******************************************************************************
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COPYRIGHT(C) JONAS 'SORTIE' TERMANSEN 2011.
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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
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with Sortix. If not, see <http://www.gnu.org/licenses/>.
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fs/devfs.cpp
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Provides access to various block, character, and other kinds of devices.
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******************************************************************************/
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#include "../platform.h"
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#include <libmaxsi/error.h>
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#include <libmaxsi/string.h>
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#include <libmaxsi/memory.h>
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#include "../filesystem.h"
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#include "../directory.h"
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#include "../stream.h"
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#include "../terminal.h"
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#include "../vga.h"
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#include "../ata.h"
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#include "devfs.h"
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using namespace Maxsi;
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namespace Sortix
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{
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class DevATA : public DevBuffer
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{
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public:
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typedef DevBuffer BaseClass;
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public:
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DevATA(ATADrive* drive);
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virtual ~DevATA();
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private:
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ATADrive* drive;
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off_t offset;
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public:
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virtual ssize_t Read(byte* dest, size_t count);
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virtual ssize_t Write(const byte* src, size_t count);
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virtual bool IsReadable();
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virtual bool IsWritable();
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virtual size_t BlockSize();
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virtual uintmax_t Size();
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virtual uintmax_t Position();
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virtual bool Seek(uintmax_t position);
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virtual bool Resize(uintmax_t size);
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};
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DevATA::DevATA(ATADrive* drive)
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{
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this->drive = drive;
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offset = 0;
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}
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DevATA::~DevATA()
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{
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}
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ssize_t DevATA::Read(byte* dest, size_t count)
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{
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if ( SIZE_MAX < count ) { count = SIZE_MAX; }
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if ( drive->GetSize() - offset < count ) { count = drive->GetSize() - offset; }
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size_t amount = drive->Read(offset, dest, count);
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if ( count && !amount ) { return -1; }
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offset += amount;
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return amount;
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}
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ssize_t DevATA::Write(const byte* src, size_t count)
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{
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if ( SIZE_MAX < count ) { count = SIZE_MAX; }
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if ( drive->GetSize() <= offset && count ) { Error::Set(ENOSPC); return -1; }
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if ( drive->GetSize() - offset < count ) { count = drive->GetSize() - offset; }
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size_t amount = drive->Write(offset, src, count);
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if ( count && !amount ) { return -1; }
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offset += amount;
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return amount;
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}
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bool DevATA::IsReadable()
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{
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return true;
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}
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bool DevATA::IsWritable()
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{
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return true;
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}
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size_t DevATA::BlockSize()
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{
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return drive->GetSectorSize();
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}
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uintmax_t DevATA::Size()
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{
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return drive->GetSize();
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}
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uintmax_t DevATA::Position()
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{
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return offset;
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}
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bool DevATA::Seek(uintmax_t position)
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{
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if ( drive->GetSize() <= position ) { Error::Set(ENOSPC); return false; }
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offset = position;
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return true;
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}
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bool DevATA::Resize(uintmax_t size)
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{
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Error::Set(EPERM);
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return false;
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}
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const size_t NUM_ATAS = 4;
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DevATA* atalist[NUM_ATAS];
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void InitATADriveList()
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{
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for ( size_t i = 0; i < NUM_ATAS; i++ )
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{
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atalist[i] = NULL;
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}
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}
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void RegisterATADrive(unsigned ataid, ATADrive* drive)
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{
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atalist[ataid] = new DevATA(drive);
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atalist[ataid]->Refer();
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}
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class DevNull : public DevStream
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{
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public:
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typedef DevStream BaseClass;
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public:
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DevNull();
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virtual ~DevNull();
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public:
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virtual ssize_t Read(byte* dest, size_t count);
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virtual ssize_t Write(const byte* src, size_t count);
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virtual bool IsReadable();
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virtual bool IsWritable();
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};
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DevNull::DevNull()
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{
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}
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DevNull::~DevNull()
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{
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}
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ssize_t DevNull::Read(byte* /*dest*/, size_t /*count*/)
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{
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return 0; // Return EOF
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}
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ssize_t DevNull::Write(const byte* /*src*/, size_t count)
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{
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if ( SSIZE_MAX < count ) { count = SSIZE_MAX; }
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// O' glorious bitbucket in the sky, I hereby sacrifice to You, my holy
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// data in trust You will keep it safe. That You will store it for all
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// eternity, until the day You will return to User-Land to rule the land
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// and preserve data-integrity for all eternity. Amen.
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return count;
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}
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bool DevNull::IsReadable()
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{
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return true;
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}
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bool DevNull::IsWritable()
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{
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return true;
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}
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class DevDevFSDir : public DevDirectory
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{
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public:
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typedef Device DevDirectory;
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public:
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DevDevFSDir();
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virtual ~DevDevFSDir();
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public:
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size_t position;
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public:
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virtual void Rewind();
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virtual int Read(sortix_dirent* dirent, size_t available);
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};
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DevDevFSDir::DevDevFSDir()
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{
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position = 0;
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}
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DevDevFSDir::~DevDevFSDir()
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{
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}
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void DevDevFSDir::Rewind()
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{
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position = 0;
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}
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int DevDevFSDir::Read(sortix_dirent* dirent, size_t available)
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{
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const char* names[] = { "null", "tty", "vga", "ata0", "ata1", "ata2", "ata3" };
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const size_t nameslength = 7;
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if ( available <= sizeof(sortix_dirent) ) { return -1; }
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if ( nameslength <= position )
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{
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dirent->d_namelen = 0;
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dirent->d_name[0] = 0;
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return 0;
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}
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const char* name = names[position];
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size_t namelen = String::Length(name);
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size_t needed = sizeof(sortix_dirent) + namelen + 1;
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if ( name[0] == 'a' && name[1] == 't' && name[2] == 'a' )
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{
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if ( !atalist[name[3]-'0'] )
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{
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position++;
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return Read(dirent, available);
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}
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}
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if ( available < needed )
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{
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dirent->d_namelen = needed;
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Error::Set(ERANGE);
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return -1;
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}
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Memory::Copy(dirent->d_name, name, namelen + 1);
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dirent->d_namelen = namelen;
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position++;
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return 0;
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}
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DevDevFS::DevDevFS()
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{
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}
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DevDevFS::~DevDevFS()
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{
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}
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extern DevTerminal* tty;
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Device* DevDevFS::Open(const char* path, int flags, mode_t mode)
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{
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if ( (flags & O_LOWERFLAGS) == O_SEARCH )
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{
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if ( path[0] == 0 || (path[0] == '/' && path[1] == 0) ) { return new DevDevFSDir(); }
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Error::Set(ENOTDIR);
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return NULL;
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}
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if ( String::Compare(path, "/null") == 0 ) { return new DevNull; }
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if ( String::Compare(path, "/tty") == 0 ) { tty->Refer(); return tty; }
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if ( String::Compare(path, "/vga") == 0 ) { return new DevVGA; }
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if ( path[0] == '/' && path[1] == 'a' && path[2] == 't' && path[3] == 'a' && path[4] && !path[5] )
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{
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if ( '0' <= path[4] && path[4] <= '9' )
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{
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size_t index = path[4] - '0';
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if ( index <= NUM_ATAS && atalist[index] )
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{
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bool write = flags & O_WRONLY; // TODO: HACK: O_RDWD != O_WRONLY | O_RDONLY
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if ( write && !ENABLE_DISKWRITE )
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{
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Error::Set(EPERM);
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return false;
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}
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return new DevFileWrapper(atalist[index], flags);
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}
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}
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}
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Error::Set(flags & O_CREAT ? EPERM : ENOENT);
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return NULL;
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}
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bool DevDevFS::Unlink(const char* path)
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{
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if ( *path == '\0' || ( *path++ == '/' && *path == '\0' ) )
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{
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Error::Set(EISDIR);
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return false;
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}
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Error::Set(EPERM);
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return false;
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}
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}
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