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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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78
Kernel/Storage/PATADiskDevice.cpp 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.
*/
//#define PATA_DEVICE_DEBUG
#include <AK/Memory.h>
#include <AK/StringView.h>
#include <Kernel/FileSystem/FileDescription.h>
#include <Kernel/Storage/IDEChannel.h>
#include <Kernel/Storage/IDEController.h>
#include <Kernel/Storage/PATADiskDevice.h>
namespace Kernel {
NonnullRefPtr<PATADiskDevice> PATADiskDevice::create(const IDEController& controller, IDEChannel& channel, DriveType type, u8 cylinders, u8 heads, u8 spt, int major, int minor)
{
return adopt(*new PATADiskDevice(controller, channel, type, cylinders, heads, spt, major, minor));
}
PATADiskDevice::PATADiskDevice(const IDEController& controller, IDEChannel& channel, DriveType type, u8 cylinders, u8 heads, u8 spt, int major, int minor)
: StorageDevice(controller, major, minor, 512, 0)
, m_cylinders(cylinders)
, m_heads(heads)
, m_sectors_per_track(spt)
, m_channel(channel)
, m_drive_type(type)
{
}
PATADiskDevice::~PATADiskDevice()
{
}
const char* PATADiskDevice::class_name() const
{
return "PATADiskDevice";
}
void PATADiskDevice::start_request(AsyncBlockDeviceRequest& request)
{
bool use_dma = !m_channel.m_io_group.bus_master_base().is_null() && m_channel.m_dma_enabled.resource();
m_channel.start_request(request, use_dma, is_slave());
}
size_t PATADiskDevice::max_addressable_block() const
{
return m_cylinders * m_heads * m_sectors_per_track;
}
bool PATADiskDevice::is_slave() const
{
return m_drive_type == DriveType::Slave;
}
}