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https://github.com/RGBCube/serenity
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e2ed6ef741
The mmap interface was removed when we introduced the DisplayConnector class, as it was quite unsafe to use and didn't handle switching between graphical and text modes safely. By using the SharedFramebufferVMObject, we are able to elegantly coordinate the switch by remapping the attached mmap'ed-Memory::Region(s) with different mappings, therefore, keeping WindowServer to think that the mappings it has are still valid, while they are going to a different physical range until we are back to the graphical mode (after a switch from text mode). Most drivers take advantage of the fact that we know where is the actual framebuffer in physical memory space, the SharedFramebufferVMObject is created with that information. However, the VirtIO driver is different in that aspect, because it relies on DMA transactions to show graphics on the framebuffer, so the SharedFramebufferVMObject is created with that mindset to support the arbitrary framebuffer location in physical memory space.
55 lines
1.9 KiB
C++
55 lines
1.9 KiB
C++
/*
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* Copyright (c) 2022, 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/RefPtr.h>
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#include <AK/Try.h>
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#include <Kernel/Graphics/Bochs/Definitions.h>
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#include <Kernel/Graphics/Console/GenericFramebufferConsole.h>
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#include <Kernel/Graphics/DisplayConnector.h>
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#include <Kernel/Locking/Spinlock.h>
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#include <Kernel/Memory/TypedMapping.h>
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namespace Kernel {
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class BochsDisplayConnector
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: public DisplayConnector {
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friend class BochsGraphicsAdapter;
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friend class DeviceManagement;
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public:
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TYPEDEF_DISTINCT_ORDERED_ID(u16, IndexID);
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static NonnullRefPtr<BochsDisplayConnector> must_create(PhysicalAddress framebuffer_address, size_t framebuffer_resource_size);
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virtual IndexID index_id() const;
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protected:
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ErrorOr<void> create_attached_framebuffer_console();
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BochsDisplayConnector(PhysicalAddress framebuffer_address, size_t framebuffer_resource_size);
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virtual bool mutable_mode_setting_capable() const override final { return true; }
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virtual bool double_framebuffering_capable() const override { return false; }
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virtual ErrorOr<void> set_mode_setting(ModeSetting const&) override;
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virtual ErrorOr<void> set_safe_mode_setting() override final;
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virtual ErrorOr<void> set_y_offset(size_t y) override;
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virtual ErrorOr<void> unblank() override;
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virtual bool partial_flush_support() const override final { return false; }
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virtual bool flush_support() const override final { return false; }
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// Note: Paravirtualized hardware doesn't require a defined refresh rate for modesetting.
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virtual bool refresh_rate_support() const override final { return false; }
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virtual ErrorOr<void> flush_first_surface() override final;
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virtual void enable_console() override final;
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virtual void disable_console() override final;
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RefPtr<Graphics::GenericFramebufferConsole> m_framebuffer_console;
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};
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}
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