Implemented a simple ATA PIO Mode driver that can read and write.
Read operations are enabled by default, but you must set DISKWRITE=1 in makeflags before write operations are permitted. This protects against accidentally corrupting the existing filesystems on the system.
This commit is contained in:
Jonas 'Sortie' Termansen
parent
4e0f57f4d7
commit
a3a2226bb5
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@ -52,6 +52,11 @@ endif
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ifeq ($(PANIC_SHORT),1)
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DEFINES:=$(DEFINES) -DPANIC_SHORT
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endif
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ifeq ($(DISKWRITE),1)
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DEFINES:=$(DEFINES) -DENABLE_DISKWRITE=1
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else
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DEFINES:=$(DEFINES) -DENABLE_DISKWRITE=0
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endif
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CPPFLAGSRELEASE=-s $(O)
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CPPFLAGSDEBUG=
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CPPFLAGS=-I.. -I. $(CPUDEFINES) $(CPUFLAGS) -std=gnu++0x -Wall -Wextra -nostdlib -fno-builtin -nostartfiles -nodefaultlibs -fno-exceptions -fno-rtti -fno-stack-protector $(DEFINES) $(CPPFLAGSRELEASE)
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@ -86,6 +91,7 @@ signal.o \
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fs/devfs.o \
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fs/initfs.o \
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fs/ramfs.o \
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ata.o \
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../libmaxsi/libmaxsi-sortix.a \
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end.o # Must be last
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@ -0,0 +1,359 @@
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/******************************************************************************
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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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ata.cpp
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Allowes access to block devices over ATA PIO.
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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/memory.h>
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#include "ata.h"
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// TODO: Use the PCI to detect ATA devices instead of relying on them being on
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// standard locations.
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using namespace Maxsi;
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namespace Sortix
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{
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const uint16_t PRIMARY_BUS_OFFSET = 0x1F0;
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const uint16_t SECONDARY_BUS_OFFSET = 0x170;
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const uint16_t DATA = 0x0;
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const uint16_t FEATURE = 0x1;
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const uint16_t ERROR = 0x1;
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const uint16_t SECTOR_COUNT = 0x2;
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const uint16_t LBA_LOW = 0x3;
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const uint16_t LBA_MID = 0x4;
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const uint16_t LBA_HIGH = 0x5;
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const uint16_t DRIVE_SELECT = 0x6;
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const uint16_t COMMAND = 0x7;
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const uint16_t STATUS = 0x7;
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const uint8_t CMD_READ = 0x20;
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const uint8_t CMD_READ_EXT = 0x24;
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const uint8_t CMD_WRITE = 0x30;
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const uint8_t CMD_WRITE_EXT = 0x34;
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const uint8_t CMD_FLUSH_CACHE = 0xE7;
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const uint8_t CMD_IDENTIFY = 0xEC;
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const uint8_t STATUS_ERROR = (1<<0);
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const uint8_t STATUS_DATAREADY = (1<<3);
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const uint8_t STATUS_DRIVEFAULT = (1<<5);
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const uint8_t STATUS_BUSY = (1<<7);
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const uint8_t CTL_NO_INTERRUPT = (1<<1);
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const uint8_t CTL_RESET = (1<<2);
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namespace ATA
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{
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void DetectDrive(unsigned busid, ATABus* bus, unsigned driveid)
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{
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unsigned ataid = busid*2 + driveid;
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ATADrive* drive = bus->Instatiate(driveid);
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if ( !drive ) { return; }
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// TODO: Actually use the drive somewhere.
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}
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void DetectBus(unsigned busid, uint16_t ioport, uint16_t altio)
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{
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ATABus* bus = ATA::CreateBus(ioport, altio);
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DetectDrive(busid, bus, 0);
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DetectDrive(busid, bus, 1);
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}
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void Init()
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{
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DetectBus(0, 0x1F0, 0x3F6);
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DetectBus(1, 0x170, 0x366);
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}
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ATABus* CreateBus(uint16_t portoffset, uint16_t altport)
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{
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unsigned status = CPU::InPortB(portoffset + STATUS);
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// Detect if there is no such bus.
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if ( status == 0xFF )
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{
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Error::Set(ENODEV);
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return NULL;
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}
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return new ATABus(portoffset, altport);
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}
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}
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void Wait400NSecs(uint16_t iobase)
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{
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// Now wait 400 ns for the drive to be ready.
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for ( unsigned i = 0; i < 4; i++ ) { CPU::InPortB(iobase + STATUS); }
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}
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ATABus::ATABus(uint16_t portoffset, uint16_t altport)
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{
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this->iobase = portoffset;
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this->altport = altport;
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this->curdriveid = 0;
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}
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ATABus::~ATABus()
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{
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}
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ATADrive* ATABus::Instatiate(unsigned driveid)
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{
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if ( 1 < driveid ) { Error::Set(EINVAL); return false; }
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curdriveid = 0;
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uint8_t drivemagic = 0xA0 | (driveid << 4);
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CPU::OutPortB(iobase + DRIVE_SELECT, drivemagic);
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CPU::OutPortB(iobase + SECTOR_COUNT, 0);
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CPU::OutPortB(iobase + LBA_LOW, 0);
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CPU::OutPortB(iobase + LBA_MID, 0);
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CPU::OutPortB(iobase + LBA_HIGH, 0);
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CPU::OutPortB(iobase + COMMAND, CMD_IDENTIFY);
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uint8_t status;
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while ( true )
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{
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status = CPU::InPortB(iobase + STATUS);
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if ( !status || status == 0xFF ) { Error::Set(ENODEV); return false; }
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if ( !(status & STATUS_BUSY) ) { break; }
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}
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if ( CPU::InPortB(iobase + LBA_MID) || CPU::InPortB(iobase + LBA_MID) )
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{
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Error::Set(ENODEV); return false; // ATAPI device not following spec.
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}
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while ( !(status & STATUS_DATAREADY) && !(status & STATUS_ERROR) )
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{
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status = CPU::InPortB(iobase + STATUS);
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}
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if ( status & STATUS_ERROR )
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{
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unsigned mid = CPU::InPortB(iobase + LBA_MID);
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unsigned high = CPU::InPortB(iobase + LBA_HIGH);
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if ( mid == 0x14 && high == 0xEB )
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{
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//Log::PrintF("Found ATAPI device instead of ATA\n");
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}
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else if ( mid == 0x3C && high == 0xC3 )
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{
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//Log::PrintF("Found SATA device instead of ATA\n");
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}
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else if ( mid || high )
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{
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//Log::PrintF("Found unknown device instead of ATA\n");
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}
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else
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{
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//Log::PrintF("Error status during identify\n");
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}
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Error::Set(EIO);
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return false;
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}
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ATADrive* drive = new ATADrive(this, driveid, iobase, altport);
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return drive;
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}
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bool ATABus::SelectDrive(unsigned driveid)
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{
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if ( driveid == curdriveid ) { return true; }
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if ( 1 < driveid ) { Error::Set(EINVAL); return false; }
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uint8_t drivemagic = 0xA0 | (driveid << 4);
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CPU::OutPortB(iobase + DRIVE_SELECT, drivemagic);
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Wait400NSecs(iobase);
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return true;
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}
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const size_t META_LBA28 = 60;
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const size_t META_FLAGS = 83;
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const size_t META_LBA48 = 100;
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const uint16_t FLAG_LBA48 = (1<<10);
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ATADrive::ATADrive(ATABus* bus, unsigned driveid, uint16_t portoffset, uint16_t altport)
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{
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this->bus = bus;
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this->driveid = driveid;
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this->iobase = portoffset;
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this->altport = altport;
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for ( size_t i = 0; i < 256; i++ )
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{
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meta[i] = CPU::InPortW(iobase + DATA);
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}
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lba48 = meta[META_FLAGS] & FLAG_LBA48;
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if ( lba48 )
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{
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numsectors = *((uint64_t*) (meta + META_LBA48));
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}
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else
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{
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numsectors = *((uint32_t*) (meta + META_LBA28));
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}
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sectorsize = 512; // TODO: Detect this!
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Initialize();
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}
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ATADrive::~ATADrive()
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{
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}
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off_t ATADrive::GetSectorSize()
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{
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return sectorsize;
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}
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off_t ATADrive::GetNumSectors()
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{
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return numsectors;
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}
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bool ATADrive::PrepareIO(bool write, off_t sector)
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{
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if ( numsectors <= sector ) { Error::Set(EINVAL); return false; }
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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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bus->SelectDrive(driveid);
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uint8_t mode = (lba48) ? 0x40 : 0xE0;
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mode |= driveid << 4;
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mode |= (lba48) ? 0 : (sector >> 24) & 0x0F;
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CPU::OutPortB(iobase + DRIVE_SELECT, mode);
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uint16_t sectorcount = 1;
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uint8_t sectorcountlow = sectorcount & 0xFF;
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uint8_t sectorcounthigh = (sectorcount >> 8) & 0xFF;
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if ( lba48 )
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{
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CPU::OutPortB(iobase + SECTOR_COUNT, sectorcounthigh);
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CPU::OutPortB(iobase + LBA_LOW, (sector >> 24) & 0xFF);
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CPU::OutPortB(iobase + LBA_MID, (sector >> 32) & 0xFF);
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CPU::OutPortB(iobase + LBA_HIGH, (sector >> 40) & 0xFF);
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}
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CPU::OutPortB(iobase + SECTOR_COUNT, sectorcountlow);
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CPU::OutPortB(iobase + LBA_LOW, sector & 0xFF);
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CPU::OutPortB(iobase + LBA_MID, (sector >> 8) & 0xFF);
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CPU::OutPortB(iobase + LBA_HIGH, (sector >> 16) & 0xFF);
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uint8_t command = (write) ? CMD_WRITE : CMD_READ;
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if ( lba48 ) { command = (write) ? CMD_WRITE_EXT : CMD_READ_EXT; }
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CPU::OutPortB(iobase + COMMAND, command);
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while ( true )
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{
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uint8_t status = CPU::InPortB(iobase + STATUS);
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if ( status & STATUS_BUSY ) { continue; }
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if ( status & STATUS_DATAREADY ) { break; }
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if ( status & STATUS_ERROR ) { Error::Set(EIO); return false; }
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if ( status & STATUS_DRIVEFAULT ) { Error::Set(EIO); return false; }
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}
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return true;
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}
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bool ATADrive::ReadSector(off_t sector, uint8_t* dest)
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{
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if ( !PrepareIO(false, sector) ) { return false; }
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uint16_t* destword = (uint16_t*) dest;
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for ( size_t i = 0; i < sectorsize/2; i++ )
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{
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destword[i] = CPU::InPortW(iobase + DATA);
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}
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Wait400NSecs(iobase);
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uint8_t status = CPU::InPortB(iobase + STATUS);
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return true;
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}
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bool ATADrive::WriteSector(off_t sector, const uint8_t* src)
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{
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if ( !PrepareIO(true, sector) ) { return false; }
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const uint16_t* srcword = (const uint16_t*) src;
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for ( size_t i = 0; i < sectorsize/2; i++ )
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{
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CPU::OutPortW(iobase + DATA, srcword[i]);
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}
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Wait400NSecs(iobase);
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CPU::OutPortB(iobase + COMMAND, CMD_FLUSH_CACHE);
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||||
while ( true )
|
||||
{
|
||||
uint8_t status = CPU::InPortB(iobase + STATUS);
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if ( status & STATUS_ERROR ) { Error::Set(EIO); return false; }
|
||||
if ( status & STATUS_DRIVEFAULT ) { Error::Set(EIO); return false; }
|
||||
if ( !(status & STATUS_BUSY) ) { break; }
|
||||
}
|
||||
return true;
|
||||
}
|
||||
|
||||
size_t ATADrive::Read(off_t byteoffset, uint8_t* dest, size_t numbytes)
|
||||
{
|
||||
size_t sofar = 0;
|
||||
size_t leadingbytes = byteoffset % sectorsize;
|
||||
if ( leadingbytes || numbytes < sectorsize )
|
||||
{
|
||||
size_t wanted = sectorsize - leadingbytes;
|
||||
if ( numbytes < wanted ) { wanted = numbytes; }
|
||||
uint8_t temp[512 /*sectorsize*/];
|
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if ( !ReadSector(byteoffset/sectorsize, temp) ) { return sofar; }
|
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Memory::Copy(dest + sofar, temp + leadingbytes, wanted);
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sofar += wanted;
|
||||
numbytes -= wanted;
|
||||
byteoffset += wanted;
|
||||
}
|
||||
|
||||
while ( sectorsize <= numbytes )
|
||||
{
|
||||
if ( !ReadSector(byteoffset/sectorsize, dest + sofar) ) { return sofar; }
|
||||
sofar += sectorsize;
|
||||
numbytes -= sectorsize;
|
||||
byteoffset += sectorsize;
|
||||
}
|
||||
|
||||
if ( numbytes ) { return sofar + Read(byteoffset, dest + sofar, numbytes); }
|
||||
return sofar;
|
||||
}
|
||||
|
||||
size_t ATADrive::Write(off_t byteoffset, const uint8_t* src, size_t numbytes)
|
||||
{
|
||||
size_t sofar = 0;
|
||||
size_t leadingbytes = byteoffset % sectorsize;
|
||||
if ( leadingbytes || numbytes < sectorsize )
|
||||
{
|
||||
size_t wanted = sectorsize - leadingbytes;
|
||||
if ( numbytes < wanted ) { wanted = numbytes; }
|
||||
uint8_t temp[512 /*sectorsize*/];
|
||||
if ( !ReadSector(byteoffset/sectorsize, temp) ) { return sofar; }
|
||||
Memory::Copy(temp + leadingbytes, src + sofar, wanted);
|
||||
if ( !WriteSector(byteoffset/sectorsize, temp) ) { return sofar; }
|
||||
sofar += wanted;
|
||||
numbytes -= wanted;
|
||||
byteoffset += wanted;
|
||||
}
|
||||
|
||||
while ( sectorsize <= numbytes )
|
||||
{
|
||||
if ( !WriteSector(byteoffset/sectorsize, src + sofar) ) { return sofar; }
|
||||
sofar += sectorsize;
|
||||
numbytes -= sectorsize;
|
||||
byteoffset += sectorsize;
|
||||
}
|
||||
|
||||
if ( numbytes ) { return sofar + Write(byteoffset, src + sofar, numbytes); }
|
||||
return sofar;
|
||||
}
|
||||
|
||||
void ATADrive::Initialize()
|
||||
{
|
||||
bus->SelectDrive(driveid);
|
||||
CPU::OutPortB(iobase + COMMAND, CTL_NO_INTERRUPT);
|
||||
}
|
||||
}
|
||||
|
||||
|
|
@ -0,0 +1,88 @@
|
|||
/******************************************************************************
|
||||
|
||||
COPYRIGHT(C) JONAS 'SORTIE' TERMANSEN 2011.
|
||||
|
||||
This file is part of Sortix.
|
||||
|
||||
Sortix is free software: you can redistribute it and/or modify it under the
|
||||
terms of the GNU General Public License as published by the Free Software
|
||||
Foundation, either version 3 of the License, or (at your option) any later
|
||||
version.
|
||||
|
||||
Sortix is distributed in the hope that it will be useful, but WITHOUT ANY
|
||||
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
|
||||
FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
|
||||
details.
|
||||
|
||||
You should have received a copy of the GNU General Public License along
|
||||
with Sortix. If not, see <http://www.gnu.org/licenses/>.
|
||||
|
||||
ata.cpp
|
||||
Allowes access to block devices over ATA PIO.
|
||||
|
||||
******************************************************************************/
|
||||
|
||||
#ifndef SORTIX_ATA_H
|
||||
#define SORTIX_ATA_H
|
||||
|
||||
namespace Sortix
|
||||
{
|
||||
class ATABus;
|
||||
class ATADrive;
|
||||
|
||||
class ATABus
|
||||
{
|
||||
public:
|
||||
ATABus(uint16_t portoffset, uint16_t altport);
|
||||
~ATABus();
|
||||
|
||||
public:
|
||||
ATADrive* Instatiate(unsigned driveid);
|
||||
bool SelectDrive(unsigned driveid);
|
||||
|
||||
private:
|
||||
unsigned curdriveid;
|
||||
uint16_t iobase;
|
||||
uint16_t altport;
|
||||
|
||||
};
|
||||
|
||||
class ATADrive
|
||||
{
|
||||
public:
|
||||
off_t GetSectorSize();
|
||||
off_t GetNumSectors();
|
||||
off_t GetSize() { return GetSectorSize() * GetNumSectors(); }
|
||||
bool ReadSector(off_t sector, uint8_t* dest);
|
||||
bool WriteSector(off_t sector, const uint8_t* src);
|
||||
size_t Read(off_t byteoffset, uint8_t* dest, size_t numbytes);
|
||||
size_t Write(off_t byteoffset, const uint8_t* src, size_t numbytes);
|
||||
|
||||
public:
|
||||
ATADrive(ATABus* bus, unsigned driveid, uint16_t portoffset, uint16_t altport);
|
||||
~ATADrive();
|
||||
|
||||
private:
|
||||
void Initialize();
|
||||
bool PrepareIO(bool write, off_t sector);
|
||||
|
||||
private:
|
||||
unsigned driveid;
|
||||
uint16_t meta[256];
|
||||
uint16_t iobase;
|
||||
uint16_t altport;
|
||||
ATABus* bus;
|
||||
bool lba48;
|
||||
size_t sectorsize;
|
||||
off_t numsectors;
|
||||
|
||||
};
|
||||
|
||||
namespace ATA
|
||||
{
|
||||
void Init();
|
||||
ATABus* CreateBus(uint16_t portoffset, uint16_t altport);
|
||||
}
|
||||
}
|
||||
|
||||
#endif
|
||||
|
|
@ -204,12 +204,7 @@ namespace Sortix
|
|||
initrdsize = 0x280000; // 2 MiB 512 KiB
|
||||
#endif
|
||||
|
||||
Memory::RegisterInitRDSize(initrdsize);
|
||||
|
||||
#ifndef JSSORTIX
|
||||
// Search for PCI devices and load their drivers.
|
||||
PCI::Init();
|
||||
#endif
|
||||
Memory::RegisterInitRDSize(initrdsize);;
|
||||
|
||||
// Initialize the paging and virtual memory.
|
||||
Memory::Init(BootInfo);
|
||||
|
|
@ -262,6 +257,11 @@ namespace Sortix
|
|||
// Set up the initial ram disk.
|
||||
InitRD::Init(initrd, initrdsize);
|
||||
|
||||
#ifndef JSSORTIX
|
||||
// Search for PCI devices and load their drivers.
|
||||
PCI::Init();
|
||||
#endif
|
||||
|
||||
// Alright, now the system's drivers are loaded and initialized. It is
|
||||
// time to load the initial user-space programs and start execution of
|
||||
// the actual operating system.
|
||||
|
|
|
|||
|
|
@ -23,8 +23,12 @@
|
|||
******************************************************************************/
|
||||
|
||||
#include "platform.h"
|
||||
#include <libmaxsi/error.h>
|
||||
#include "pci.h"
|
||||
#include "log.h"
|
||||
#include "ata.h"
|
||||
|
||||
using namespace Maxsi;
|
||||
|
||||
namespace Sortix
|
||||
{
|
||||
|
|
@ -231,6 +235,7 @@ namespace Sortix
|
|||
|
||||
void Init()
|
||||
{
|
||||
ATA::Init();
|
||||
#if 0
|
||||
Log::Print("PCI Devices: ");
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue