407 lines
8.4 KiB
C++
407 lines
8.4 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 <sortix/kernel/platform.h>
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#include <libmaxsi/string.h>
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#include <assert.h>
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#include <errno.h>
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#include <string.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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#include "videofs.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(uint8_t* dest, size_t count);
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virtual ssize_t Write(const uint8_t* 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(uint8_t* 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 uint8_t* 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 ) { errno = 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 ) { errno = 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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errno = EPERM;
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return false;
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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(uint8_t* dest, size_t count);
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virtual ssize_t Write(const uint8_t* 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(uint8_t* /*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 uint8_t* /*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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// TODO: Move this namespace into something like devicefs.cpp.
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namespace DeviceFS {
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size_t entriesused;
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size_t entrieslength;
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DevEntry* deventries;
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DevVideoFS* videofs;
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void Init()
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{
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deventries = NULL;
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entriesused = 0;
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entrieslength = 0;
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videofs = new DevVideoFS;
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if ( !videofs ) { Panic("Unable to allocate videofs\n"); }
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}
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bool RegisterDevice(const char* name, Device* dev)
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{
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if ( entriesused == entrieslength )
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{
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size_t newentrieslength = entrieslength ? 2 * entrieslength : 32;
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DevEntry* newdeventries = new DevEntry[newentrieslength];
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if ( !newdeventries ) { return false; }
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size_t bytes = sizeof(DevEntry) * entriesused;
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memcpy(newdeventries, deventries, bytes);
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delete[] deventries;
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entrieslength = newentrieslength;
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deventries = newdeventries;
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}
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char* nameclone = String::Clone(name);
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if ( !nameclone ) { return false; }
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size_t index = entriesused++;
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dev->Refer();
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deventries[index].name = nameclone;
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deventries[index].dev = dev;
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return true;
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}
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Device* LookUp(const char* name)
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{
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for ( size_t i = 0; i < entriesused; i++ )
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{
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if ( strcmp(name, deventries[i].name) ) { continue; }
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deventries[i].dev->Refer();
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return deventries[i].dev;
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}
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return NULL;
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}
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size_t GetNumDevices()
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{
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return entriesused;
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}
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DevEntry* GetDevice(size_t index)
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{
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if ( entriesused <= index ) { return NULL; }
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return deventries + index;
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}
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// TODO: Hack to register ATA devices.
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// FIXME: Move class DevATA into ata.cpp.
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void RegisterATADrive(unsigned ataid, ATADrive* drive)
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{
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DevATA* ata = new DevATA(drive);
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if ( !ata ) { Panic("Cannot allocate ATA device"); }
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ata->Refer();
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assert(ataid < 10);
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char name[5] = "ataN";
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name[3] = '0' + ataid;
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if ( !RegisterDevice(name, ata) )
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{
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PanicF("Cannot register /dev/%s", name);
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}
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ata->Unref();
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}
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} // namespace DeviceFS
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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", "video", "vga" };
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const char* name = NULL;
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if ( position < DeviceFS::GetNumDevices() )
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{
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name = DeviceFS::GetDevice(position)->name;
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}
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else
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{
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const size_t nameslength = 4;
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size_t index = position - DeviceFS::GetNumDevices();
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if ( nameslength <= index )
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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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name = names[index];
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}
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if ( available <= sizeof(sortix_dirent) ) { return -1; }
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size_t namelen = strlen(name);
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size_t needed = sizeof(sortix_dirent) + namelen + 1;
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if ( available < needed )
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{
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dirent->d_namelen = needed;
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errno = ERANGE;
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return -1;
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}
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memcpy(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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int lowerflags = flags & O_LOWERFLAGS;
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if ( !path[0] || (path[0] == '/' && !path[1]) )
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{
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if ( lowerflags != O_SEARCH ) { errno = EISDIR; return NULL; }
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return new DevDevFSDir();
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}
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if ( strcmp(path, "/null") == 0 ) { return new DevNull; }
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if ( strcmp(path, "/tty") == 0 ) { tty->Refer(); return tty; }
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if ( strcmp(path, "/vga") == 0 ) { return new DevVGA; }
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if ( strcmp(path, "/video") == 0 ||
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String::StartsWith(path, "/video/") )
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{
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return DeviceFS::videofs->Open(path + strlen("/video"), flags, mode);
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}
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Device* dev = DeviceFS::LookUp(path + 1);
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if ( !dev )
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{
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errno = flags & O_CREAT ? EPERM : ENOENT;
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return NULL;
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}
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if ( dev->IsType(Device::BUFFER) )
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{
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DevBuffer* buffer = (DevBuffer*) dev;
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DevFileWrapper* wrapper = new DevFileWrapper(buffer, flags);
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buffer->Unref();
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return wrapper;
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}
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return dev;
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}
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bool DevDevFS::Unlink(const char* path)
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{
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if ( strcmp(path, "/video") == 0 ||
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String::StartsWith(path, "/video/") )
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{
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return DeviceFS::videofs->Unlink(path);
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}
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if ( *path == '\0' || ( *path++ == '/' && *path == '\0' ) )
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{
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errno = EISDIR;
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return false;
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}
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errno = EPERM;
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return false;
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}
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}
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