mirror of
https://github.com/RGBCube/serenity
synced 2025-05-25 07:25:07 +00:00
e445ff670d
This allows issuing asynchronous requests for devices and waiting on the completion of the request. The requests can cascade into multiple sub-requests. Since IRQs may complete at any time, if the current process is no longer the same that started the process, we need to swich the paging context before accessing user buffers. Change the PATA driver to use this model.
121 lines
4.1 KiB
C++
121 lines
4.1 KiB
C++
/*
|
|
* 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/Lock.h>
|
|
#include <Kernel/PCI/Access.h>
|
|
#include <Kernel/PCI/Device.h>
|
|
#include <Kernel/PhysicalAddress.h>
|
|
#include <Kernel/Random.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 PATADiskDevice;
|
|
class PATAChannel final : public PCI::Device {
|
|
friend class PATADiskDevice;
|
|
AK_MAKE_ETERNAL
|
|
public:
|
|
enum class ChannelType : u8 {
|
|
Primary,
|
|
Secondary
|
|
};
|
|
|
|
public:
|
|
static OwnPtr<PATAChannel> create(ChannelType type, bool force_pio);
|
|
PATAChannel(PCI::Address address, ChannelType type, bool force_pio);
|
|
virtual ~PATAChannel() override;
|
|
|
|
RefPtr<PATADiskDevice> master_device() { return m_master; };
|
|
RefPtr<PATADiskDevice> slave_device() { return m_slave; };
|
|
|
|
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
|
|
IOAddress m_io_base;
|
|
IOAddress m_control_base;
|
|
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;
|
|
IOAddress m_bus_master_base;
|
|
Lockable<bool> m_dma_enabled;
|
|
EntropySource m_entropy_source;
|
|
|
|
RefPtr<PATADiskDevice> m_master;
|
|
RefPtr<PATADiskDevice> 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;
|
|
};
|
|
}
|