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https://github.com/RGBCube/serenity
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79fa9765ca
We now use AK::Error and AK::ErrorOr<T> in both kernel and userspace! This was a slightly tedious refactoring that took a long time, so it's not unlikely that some bugs crept in. Nevertheless, it does pass basic functionality testing, and it's just real nice to finally see the same pattern in all contexts. :^)
71 lines
2.9 KiB
C++
71 lines
2.9 KiB
C++
/*
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* Copyright (c) 2021, Liav A. <liavalb@hotmail.co.il>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/Error.h>
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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/Graphics/GenericGraphicsAdapter.h>
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#include <Kernel/Locking/Mutex.h>
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#include <LibC/sys/ioctl_numbers.h>
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namespace Kernel {
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class GenericFramebufferDevice : public BlockDevice {
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AK_MAKE_ETERNAL
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friend class DeviceManagement;
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public:
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virtual ErrorOr<void> try_to_initialize() = 0;
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virtual void deactivate_writes() = 0;
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virtual void activate_writes() = 0;
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virtual ~GenericFramebufferDevice() = default;
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// ^File
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virtual ErrorOr<Memory::Region*> mmap(Process&, OpenFileDescription&, Memory::VirtualRange const&, u64 offset, int prot, bool shared) = 0;
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virtual ErrorOr<void> ioctl(OpenFileDescription&, unsigned request, Userspace<void*> arg) override final;
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virtual StringView class_name() const override final { return "FramebufferDevice"sv; }
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private:
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// ^File
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virtual bool can_read(const OpenFileDescription&, size_t) const override final { return true; }
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virtual bool can_write(const OpenFileDescription&, size_t) const override final { return true; }
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virtual void start_request(AsyncBlockDeviceRequest& request) override final { request.complete(AsyncDeviceRequest::Failure); }
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virtual ErrorOr<size_t> read(OpenFileDescription&, u64, UserOrKernelBuffer&, size_t) override { return EINVAL; }
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virtual ErrorOr<size_t> write(OpenFileDescription&, u64, const UserOrKernelBuffer&, size_t) override { return EINVAL; }
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protected:
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virtual bool multihead_support() const = 0;
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virtual bool flushing_support() const = 0;
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virtual bool partial_flushing_support() const = 0;
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virtual size_t heads_count() const = 0;
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virtual ErrorOr<size_t> buffer_length(size_t head) const = 0;
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virtual ErrorOr<size_t> pitch(size_t head) const = 0;
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virtual ErrorOr<size_t> height(size_t head) const = 0;
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virtual ErrorOr<size_t> width(size_t head) const = 0;
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virtual ErrorOr<size_t> vertical_offset(size_t head) const = 0;
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virtual ErrorOr<bool> vertical_offseted(size_t head) const = 0;
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virtual ErrorOr<void> set_head_resolution(size_t head, size_t width, size_t height, size_t pitch) = 0;
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virtual ErrorOr<void> set_head_buffer(size_t head, bool second_buffer) = 0;
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virtual ErrorOr<void> flush_head_buffer(size_t head) = 0;
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// FIXME: This method is too much specific to the VirtIO implementation (especially the buffer_index parameter)
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virtual ErrorOr<void> flush_rectangle(size_t buffer_index, FBRect const&) = 0;
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ErrorOr<void> verify_head_index(int head_index) const;
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GenericFramebufferDevice(const GenericGraphicsAdapter&);
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mutable WeakPtr<GenericGraphicsAdapter> m_graphics_adapter;
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mutable Mutex m_heads_lock;
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mutable Mutex m_flushing_lock;
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mutable Mutex m_resolution_lock;
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};
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}
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