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Kernel: Introduce a new graphics subsystem

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This new subsystem is replacing the old code that was used to
create device nodes of framebuffer devices in /dev.

This subsystem includes for now 3 roles:
1. GraphicsManagement singleton object that is used in the boot
process to enumerate and initialize display devices.
2. GraphicsDevice(s) that are used to control the display adapter.
3. FramebufferDevice(s) that are used to control the device node in
/dev.

For now, we support the Bochs display adapter and any other
generic VGA compatible adapter that was configured by the boot
loader to a known and fixed resolution.

Two improvements in the Bochs display adapter code are that
we can support native bochs-display device (this device doesn't
expose any VGA capabilities) and also that we use the MMIO region,
to configure the device, instead of setting IO ports for such tasks.
This commit is contained in:
Liav A 2021-03-05 14:23:08 +02:00 • committed by Andreas Kling
parent 8515a1c49d
commit 6a728e2d76
18 changed files with 672 additions and 428 deletions
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49
Kernel/Graphics/FramebufferDevice.h Normal file
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/*
* Copyright (c) 2021, Liav A. <liavalb@hotmail.co.il>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/String.h>
#include <AK/Types.h>
#include <Kernel/Devices/BlockDevice.h>
#include <Kernel/Graphics/GraphicsDevice.h>
#include <Kernel/PhysicalAddress.h>
namespace Kernel {
class FramebufferDevice : public BlockDevice {
AK_MAKE_ETERNAL
public:
virtual int ioctl(FileDescription&, unsigned request, FlatPtr arg) override;
virtual KResultOr<Region*> mmap(Process&, FileDescription&, const Range&, u64 offset, int prot, bool shared) override;
// ^Device
virtual mode_t required_mode() const override { return 0660; }
virtual String device_name() const override;
virtual size_t framebuffer_size_in_bytes() const { return m_framebuffer_pitch * m_framebuffer_height; }
virtual ~FramebufferDevice() {};
protected:
virtual bool set_resolution(size_t framebuffer_width, size_t framebuffer_height, size_t framebuffer_pitch);
FramebufferDevice(PhysicalAddress, size_t, size_t, size_t);
virtual bool can_read(const FileDescription&, size_t) const override final { return true; }
virtual bool can_write(const FileDescription&, size_t) const override final { return true; }
virtual void start_request(AsyncBlockDeviceRequest& request) override final { request.complete(AsyncDeviceRequest::Failure); }
virtual KResultOr<size_t> read(FileDescription&, u64, UserOrKernelBuffer&, size_t) override { return -EINVAL; }
virtual KResultOr<size_t> write(FileDescription&, u64, const UserOrKernelBuffer&, size_t) override { return -EINVAL; }
protected:
PhysicalAddress m_framebuffer_address;
size_t m_framebuffer_pitch { 0 };
size_t m_framebuffer_width { 0 };
size_t m_framebuffer_height { 0 };
};
}