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Kernel: Introduce the new Storage subsystem

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This new subsystem is somewhat replacing the IDE disk code we had with a
new flexible design.

StorageDevice is a generic class that represent a generic storage
device. It is meant that specific storage hardware will override the
interface. StorageController is a generic class that represent
a storage controller that can be found in a machine.

The IDEController class governs two IDEChannels. An IDEChannel is
responsible to manage the master & slave devices of the channel,
therefore an IDEChannel is an IRQHandler.
This commit is contained in:
Liav A 2020-12-19 12:50:57 +02:00 • committed by Andreas Kling
parent 39c1783387
commit 0a2b00a1bf
12 changed files with 604 additions and 213 deletions
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156
Kernel/Storage/IDEChannel.h Normal file
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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
//
// Parallel ATA (PATA) controller driver
//
// This driver describes a logical PATA Channel. Each channel can connect up to 2
// IDE Hard Disk Drives. The drives themselves can be either the master drive (hd0)
// or the slave drive (hd1).
//
// More information about the ATA spec for PATA can be found here:
// ftp://ftp.seagate.com/acrobat/reference/111-1c.pdf
//
#pragma once
#include <AK/OwnPtr.h>
#include <AK/RefPtr.h>
#include <Kernel/Devices/Device.h>
#include <Kernel/IO.h>
#include <Kernel/Interrupts/IRQHandler.h>
#include <Kernel/Lock.h>
#include <Kernel/PhysicalAddress.h>
#include <Kernel/Random.h>
#include <Kernel/Storage/StorageDevice.h>
#include <Kernel/VM/PhysicalPage.h>
#include <Kernel/WaitQueue.h>
namespace Kernel {
class AsyncBlockDeviceRequest;
struct PhysicalRegionDescriptor {
PhysicalAddress offset;
u16 size { 0 };
u16 end_of_table { 0 };
};
class IDEController;
class IDEChannel final : public IRQHandler {
friend class IDEController;
friend class PATADiskDevice;
AK_MAKE_ETERNAL
public:
enum class ChannelType : u8 {
Primary,
Secondary
};
struct IOAddressGroup {
IOAddressGroup(IOAddress io_base, IOAddress control_base, IOAddress bus_master_base)
: m_io_base(io_base)
, m_control_base(control_base)
, m_bus_master_base(bus_master_base)
{
}
// Disable default implementations that would use surprising integer promotion.
bool operator==(const IOAddressGroup&) const = delete;
bool operator<=(const IOAddressGroup&) const = delete;
bool operator>=(const IOAddressGroup&) const = delete;
bool operator<(const IOAddressGroup&) const = delete;
bool operator>(const IOAddressGroup&) const = delete;
IOAddress io_base() const { return m_io_base; };
IOAddress control_base() const { return m_control_base; }
IOAddress bus_master_base() const { return m_bus_master_base; }
const IOAddressGroup& operator=(const IOAddressGroup& group)
{
m_io_base = group.io_base();
m_control_base = group.control_base();
m_bus_master_base = group.bus_master_base();
return *this;
}
private:
IOAddress m_io_base;
IOAddress m_control_base;
IOAddress m_bus_master_base;
};
public:
static NonnullOwnPtr<IDEChannel> create(const IDEController&, IOAddressGroup, ChannelType type, bool force_pio);
IDEChannel(const IDEController&, IOAddressGroup, ChannelType type, bool force_pio);
virtual ~IDEChannel() override;
RefPtr<StorageDevice> master_device();
RefPtr<StorageDevice> slave_device();
virtual const char* purpose() const override { return "PATA Channel"; }
private:
//^ IRQHandler
virtual void handle_irq(const RegisterState&) override;
void initialize(bool force_pio);
void detect_disks();
void start_request(AsyncBlockDeviceRequest&, bool, bool);
void complete_current_request(AsyncDeviceRequest::RequestResult);
void ata_read_sectors_with_dma(bool);
void ata_read_sectors(bool);
bool ata_do_read_sector();
void ata_write_sectors_with_dma(bool);
void ata_write_sectors(bool);
void ata_do_write_sector();
// Data members
u8 m_channel_number { 0 }; // Channel number. 0 = master, 1 = slave
volatile u8 m_device_error { 0 };
PhysicalRegionDescriptor& prdt() { return *reinterpret_cast<PhysicalRegionDescriptor*>(m_prdt_page->paddr().offset(0xc0000000).as_ptr()); }
RefPtr<PhysicalPage> m_prdt_page;
RefPtr<PhysicalPage> m_dma_buffer_page;
Lockable<bool> m_dma_enabled;
EntropySource m_entropy_source;
RefPtr<StorageDevice> m_master;
RefPtr<StorageDevice> m_slave;
AsyncBlockDeviceRequest* m_current_request { nullptr };
u32 m_current_request_block_index { 0 };
bool m_current_request_uses_dma { false };
bool m_current_request_flushing_cache { false };
SpinLock<u8> m_request_lock;
IOAddressGroup m_io_group;
NonnullRefPtr<IDEController> m_parent_controller;
};
}