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62 lines
2.3 KiB
C++
62 lines
2.3 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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#pragma once
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#include <Kernel/Devices/Device.h>
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namespace Kernel {
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class BlockDevice : public Device {
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public:
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virtual ~BlockDevice() override;
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size_t block_size() const { return m_block_size; }
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virtual bool is_seekable() const override { return true; }
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bool read_block(unsigned index, u8*) const;
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bool write_block(unsigned index, const u8*);
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bool read_raw(u32 offset, unsigned length, u8*) const;
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bool write_raw(u32 offset, unsigned length, const u8*);
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virtual bool read_blocks(unsigned index, u16 count, u8*) = 0;
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virtual bool write_blocks(unsigned index, u16 count, const u8*) = 0;
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protected:
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BlockDevice(unsigned major, unsigned minor, size_t block_size = PAGE_SIZE)
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: Device(major, minor)
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, m_block_size(block_size)
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{
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}
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private:
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virtual bool is_block_device() const final { return true; }
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size_t m_block_size { 0 };
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};
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}
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