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7a3ab6c517
Instead of returning a ssize_t where negative values mean error, we now return KResultOr<size_t> and use the error state to report errors exclusively.
64 lines
2.8 KiB
C++
64 lines
2.8 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 <AK/String.h>
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#include <AK/Types.h>
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#include <Kernel/Devices/BlockDevice.h>
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#include <Kernel/PhysicalAddress.h>
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namespace Kernel {
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class MBVGADevice final : public BlockDevice {
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AK_MAKE_ETERNAL
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public:
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static MBVGADevice& the();
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MBVGADevice(PhysicalAddress addr, size_t pitch, size_t width, size_t height);
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virtual int ioctl(FileDescription&, unsigned request, FlatPtr arg) override;
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virtual KResultOr<Region*> mmap(Process&, FileDescription&, VirtualAddress preferred_vaddr, size_t offset, size_t, int prot, bool shared) override;
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private:
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virtual const char* class_name() const override { return "MBVGA"; }
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virtual bool can_read(const FileDescription&, size_t) const override { return true; }
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virtual bool can_write(const FileDescription&, size_t) const override { return true; }
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virtual KResultOr<size_t> read(FileDescription&, size_t, u8*, size_t) override { return -EINVAL; }
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virtual KResultOr<size_t> write(FileDescription&, size_t, const u8*, size_t) override { return -EINVAL; }
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virtual bool read_blocks(unsigned, u16, u8*) override { return false; }
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virtual bool write_blocks(unsigned, u16, const u8*) override { return false; }
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size_t framebuffer_size_in_bytes() const { return m_framebuffer_pitch * m_framebuffer_height; }
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PhysicalAddress m_framebuffer_address;
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size_t m_framebuffer_pitch { 0 };
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size_t m_framebuffer_width { 0 };
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size_t m_framebuffer_height { 0 };
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};
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}
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