ac7ce12123
This was a premature optimization from the early days of SerenityOS. The eternal heap was a simple bump pointer allocator over a static byte array. My original idea was to avoid heap fragmentation and improve data locality, but both ideas were rooted in cargo culting, not data. We would reserve 4 MiB at boot and only ended up using ~256 KiB, wasting the rest. This patch replaces all kmalloc_eternal() usage by regular kmalloc().
60 lines
1.7 KiB
C++
60 lines
1.7 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/NonnullOwnPtr.h>
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#include <AK/NonnullRefPtr.h>
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#include <AK/NonnullRefPtrVector.h>
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#include <AK/Types.h>
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#include <Kernel/Bus/PCI/Definitions.h>
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#include <Kernel/Graphics/Console/Console.h>
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#include <Kernel/Graphics/GenericGraphicsAdapter.h>
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#include <Kernel/Graphics/VGACompatibleAdapter.h>
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#include <Kernel/Graphics/VirtIOGPU/GraphicsAdapter.h>
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#include <Kernel/Memory/Region.h>
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namespace Kernel {
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class BochsGraphicsAdapter;
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class IntelNativeGraphicsAdapter;
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class VGACompatibleAdapter;
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class GraphicsManagement {
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friend class BochsGraphicsAdapter;
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friend class IntelNativeGraphicsAdapter;
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friend class VGACompatibleAdapter;
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friend class Graphics::VirtIOGPU::GraphicsAdapter;
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public:
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static GraphicsManagement& the();
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static bool is_initialized();
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bool initialize();
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unsigned allocate_minor_device_number() { return m_current_minor_number++; };
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GraphicsManagement();
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bool framebuffer_devices_allowed() const;
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bool framebuffer_devices_exist() const;
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Spinlock& main_vga_lock() { return m_main_vga_lock; }
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RefPtr<Graphics::Console> console() const { return m_console; }
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void deactivate_graphical_mode();
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void activate_graphical_mode();
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private:
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bool determine_and_initialize_graphics_device(PCI::DeviceIdentifier const&);
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NonnullRefPtrVector<GenericGraphicsAdapter> m_graphics_devices;
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RefPtr<Graphics::Console> m_console;
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// Note: there could be multiple VGA adapters, but only one can operate in VGA mode
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RefPtr<VGACompatibleAdapter> m_vga_adapter;
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unsigned m_current_minor_number { 0 };
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Spinlock m_main_vga_lock;
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};
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}
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