mirror of
https://github.com/SerenityOS/serenity.git
synced 2025-01-26 19:32:06 -05:00
401c87a0cc
It is now possible to mount ext2 `DiskDevice` devices under Serenity on any folder in the root filesystem. Currently any user can do this with any permissions. There's a fair amount of assumptions made here too, that might not be too good, but can be worked on in the future. This is a good start to allow more dynamic operation under the OS itself. It is also currently impossible to unmount and such, and devices will fail to mount in Linux as the FS 'needs to be cleaned'. I'll work on getting `umount` done ASAP to rectify this (as well as working on less assumption-making in the mount syscall. We don't want to just be able to mount DiskDevices!). This could probably be fixed with some `-t` flag or something similar.
165 lines
4.2 KiB
C++
165 lines
4.2 KiB
C++
#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, int major, int minor)
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{
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return adopt(*new PATADiskDevice(channel, type, major, minor));
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}
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PATADiskDevice::PATADiskDevice(PATAChannel& channel, DriveType type, int major, int minor)
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: DiskDevice(major, minor)
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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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