mirror of
https://github.com/RGBCube/serenity
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94ca55cefd
As suggested by Joshua, this commit adds the 2-clause BSD license as a comment block to the top of every source file. For the first pass, I've just added myself for simplicity. I encourage everyone to add themselves as copyright holders of any file they've added or modified in some significant way. If I've added myself in error somewhere, feel free to replace it with the appropriate copyright holder instead. Going forward, all new source files should include a license header.
102 lines
3.6 KiB
C++
102 lines
3.6 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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//
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// Parallel ATA (PATA) controller driver
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//
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// This driver describes a logical PATA Channel. Each channel can connect up to 2
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// IDE Hard Disk Drives. The drives themselves can be either the master drive (hd0)
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// or the slave drive (hd1).
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//
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// More information about the ATA spec for PATA can be found here:
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// ftp://ftp.seagate.com/acrobat/reference/111-1c.pdf
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//
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#pragma once
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#include <AK/OwnPtr.h>
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#include <AK/RefPtr.h>
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#include <Kernel/IRQHandler.h>
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#include <Kernel/Lock.h>
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#include <Kernel/PCI/Access.h>
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#include <Kernel/VM/PhysicalAddress.h>
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#include <Kernel/VM/PhysicalPage.h>
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#include <Kernel/WaitQueue.h>
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struct PhysicalRegionDescriptor {
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PhysicalAddress offset;
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u16 size { 0 };
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u16 end_of_table { 0 };
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};
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class PATADiskDevice;
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class PATAChannel final : public IRQHandler {
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friend class PATADiskDevice;
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AK_MAKE_ETERNAL
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public:
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enum class ChannelType : u8 {
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Primary,
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Secondary
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};
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public:
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static OwnPtr<PATAChannel> create(ChannelType type, bool force_pio);
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PATAChannel(ChannelType type, bool force_pio);
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virtual ~PATAChannel() override;
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RefPtr<PATADiskDevice> master_device() { return m_master; };
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RefPtr<PATADiskDevice> slave_device() { return m_slave; };
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private:
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//^ IRQHandler
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virtual void handle_irq() override;
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void initialize(bool force_pio);
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void detect_disks();
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void wait_for_irq();
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bool ata_read_sectors_with_dma(u32, u16, u8*, bool);
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bool ata_write_sectors_with_dma(u32, u16, const u8*, bool);
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bool ata_read_sectors(u32, u16, u8*, bool);
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bool ata_write_sectors(u32, u16, const u8*, bool);
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// Data members
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u8 m_channel_number { 0 }; // Channel number. 0 = master, 1 = slave
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u16 m_io_base { 0x1F0 };
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u16 m_control_base { 0 };
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volatile u8 m_device_error { 0 };
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WaitQueue m_irq_queue;
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PCI::Address m_pci_address;
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PhysicalRegionDescriptor& prdt() { return *reinterpret_cast<PhysicalRegionDescriptor*>(m_prdt_page->paddr().offset(0xc0000000).as_ptr()); }
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RefPtr<PhysicalPage> m_prdt_page;
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RefPtr<PhysicalPage> m_dma_buffer_page;
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u16 m_bus_master_base { 0 };
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Lockable<bool> m_dma_enabled;
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RefPtr<PATADiskDevice> m_master;
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RefPtr<PATADiskDevice> m_slave;
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};
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