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Kernel: Expand PATA driver to support multiple hard drives (#365)
The previous implementation of the PIIX3/4 PATA/IDE channel driver only supported a single drive, as the object model was wrong (the channel inherits the IRQ, not the disk drive itself). This fixes it by 'attaching' two `PATADiskDevices` to a `PATAChannel`, which makes more sense. The reading/writing code is presented as is, which violates the spec outlined by Seagate in the linked datasheet. That spec is rather old, so it might not be 100% up to date, though may cause issues on real hardware, so until we can actually test it, this will suffice.
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6 changed files with 442 additions and 239 deletions
164
Kernel/Devices/PATADiskDevice.cpp
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164
Kernel/Devices/PATADiskDevice.cpp
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#include "PATADiskDevice.h"
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#include <Kernel/Arch/i386/PIC.h>
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#include <Kernel/FileSystem/ProcFS.h>
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#include <Kernel/IO.h>
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#include <Kernel/Process.h>
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#include <Kernel/StdLib.h>
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#include <Kernel/VM/MemoryManager.h>
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//#define DISK_DEBUG
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#define IRQ_FIXED_DISK 14
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#define ATA_SR_BSY 0x80
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#define ATA_SR_DRDY 0x40
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#define ATA_SR_DF 0x20
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#define ATA_SR_DSC 0x10
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#define ATA_SR_DRQ 0x08
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#define ATA_SR_CORR 0x04
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#define ATA_SR_IDX 0x02
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#define ATA_SR_ERR 0x01
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#define ATA_ER_BBK 0x80
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#define ATA_ER_UNC 0x40
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#define ATA_ER_MC 0x20
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#define ATA_ER_IDNF 0x10
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#define ATA_ER_MCR 0x08
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#define ATA_ER_ABRT 0x04
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#define ATA_ER_TK0NF 0x02
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#define ATA_ER_AMNF 0x01
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#define ATA_CMD_READ_PIO 0x20
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#define ATA_CMD_READ_PIO_EXT 0x24
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#define ATA_CMD_READ_DMA 0xC8
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#define ATA_CMD_READ_DMA_EXT 0x25
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#define ATA_CMD_WRITE_PIO 0x30
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#define ATA_CMD_WRITE_PIO_EXT 0x34
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#define ATA_CMD_WRITE_DMA 0xCA
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#define ATA_CMD_WRITE_DMA_EXT 0x35
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#define ATA_CMD_CACHE_FLUSH 0xE7
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#define ATA_CMD_CACHE_FLUSH_EXT 0xEA
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#define ATA_CMD_PACKET 0xA0
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#define ATA_CMD_IDENTIFY_PACKET 0xA1
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#define ATA_CMD_IDENTIFY 0xEC
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#define ATAPI_CMD_READ 0xA8
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#define ATAPI_CMD_EJECT 0x1B
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#define ATA_IDENT_DEVICETYPE 0
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#define ATA_IDENT_CYLINDERS 2
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#define ATA_IDENT_HEADS 6
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#define ATA_IDENT_SECTORS 12
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#define ATA_IDENT_SERIAL 20
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#define ATA_IDENT_MODEL 54
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#define ATA_IDENT_CAPABILITIES 98
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#define ATA_IDENT_FIELDVALID 106
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#define ATA_IDENT_MAX_LBA 120
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#define ATA_IDENT_COMMANDSETS 164
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#define ATA_IDENT_MAX_LBA_EXT 200
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#define IDE_ATA 0x00
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#define IDE_ATAPI 0x01
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#define ATA_REG_DATA 0x00
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#define ATA_REG_ERROR 0x01
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#define ATA_REG_FEATURES 0x01
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#define ATA_REG_SECCOUNT0 0x02
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#define ATA_REG_LBA0 0x03
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#define ATA_REG_LBA1 0x04
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#define ATA_REG_LBA2 0x05
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#define ATA_REG_HDDEVSEL 0x06
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#define ATA_REG_COMMAND 0x07
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#define ATA_REG_STATUS 0x07
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#define ATA_REG_SECCOUNT1 0x08
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#define ATA_REG_LBA3 0x09
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#define ATA_REG_LBA4 0x0A
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#define ATA_REG_LBA5 0x0B
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#define ATA_REG_CONTROL 0x0C
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#define ATA_REG_ALTSTATUS 0x0C
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#define ATA_REG_DEVADDRESS 0x0D
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NonnullRefPtr<PATADiskDevice> PATADiskDevice::create(PATAChannel& channel, DriveType type)
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{
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return adopt(*new PATADiskDevice(channel, type));
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}
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PATADiskDevice::PATADiskDevice(PATAChannel& channel, DriveType type)
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: m_drive_type(type)
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, m_channel(channel)
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{
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}
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PATADiskDevice::~PATADiskDevice()
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{
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}
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const char* PATADiskDevice::class_name() const
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{
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return "PATADiskDevice";
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}
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unsigned PATADiskDevice::block_size() const
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{
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return 512;
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}
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bool PATADiskDevice::read_blocks(unsigned index, u16 count, u8* out)
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{
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if (m_channel.m_bus_master_base && m_channel.m_dma_enabled.resource())
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return read_sectors_with_dma(index, count, out);
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return read_sectors(index, count, out);
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}
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bool PATADiskDevice::read_block(unsigned index, u8* out) const
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{
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return const_cast<PATADiskDevice*>(this)->read_blocks(index, 1, out);
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}
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bool PATADiskDevice::write_blocks(unsigned index, u16 count, const u8* data)
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{
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if (m_channel.m_bus_master_base && m_channel.m_dma_enabled.resource())
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return write_sectors_with_dma(index, count, data);
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for (unsigned i = 0; i < count; ++i) {
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if (!write_sectors(index + i, 1, data + i * 512))
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return false;
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}
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return true;
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}
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bool PATADiskDevice::write_block(unsigned index, const u8* data)
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{
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return write_blocks(index, 1, data);
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}
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void PATADiskDevice::set_drive_geometry(u16 cyls, u16 heads, u16 spt)
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{
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m_cylinders = cyls;
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m_heads = heads;
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m_sectors_per_track = spt;
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}
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bool PATADiskDevice::read_sectors_with_dma(u32 lba, u16 count, u8* outbuf)
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{
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return m_channel.ata_read_sectors_with_dma(lba, count, outbuf, is_slave());
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}
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bool PATADiskDevice::read_sectors(u32 start_sector, u16 count, u8* outbuf)
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{
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return m_channel.ata_read_sectors(start_sector, count, outbuf, is_slave());
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}
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bool PATADiskDevice::write_sectors_with_dma(u32 lba, u16 count, const u8* inbuf)
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{
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return m_channel.ata_write_sectors_with_dma(lba, count, inbuf, is_slave());
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}
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bool PATADiskDevice::write_sectors(u32 start_sector, u16 count, const u8* inbuf)
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{
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return m_channel.ata_write_sectors(start_sector, count, inbuf, is_slave());
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}
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bool PATADiskDevice::is_slave() const
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{
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return m_drive_type == DriveType::Slave;
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}
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