Kernel/Graphics: Use DisplayConnector design with generic framebuffers

Kernel/Graphics/VGA/DisplayConnector.h

@@ -0,0 +1,53 @@
+/*
+ * Copyright (c) 2022, Liav A. <liavalb@hotmail.co.il>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <AK/RefPtr.h>
+#include <AK/Try.h>
+#include <Kernel/Graphics/Console/GenericFramebufferConsole.h>
+#include <Kernel/Graphics/DisplayConnector.h>
+#include <Kernel/Locking/Spinlock.h>
+#include <Kernel/Memory/TypedMapping.h>
+
+namespace Kernel {
+
+class GenericDisplayConnector
+    : public DisplayConnector {
+    friend class DeviceManagement;
+
+public:
+    static NonnullRefPtr<GenericDisplayConnector> must_create_with_preset_resolution(PhysicalAddress framebuffer_address, size_t width, size_t height, size_t pitch);
+
+protected:
+    ErrorOr<void> create_attached_framebuffer_console();
+
+    GenericDisplayConnector(PhysicalAddress framebuffer_address, size_t width, size_t height, size_t pitch);
+
+    virtual bool mutable_mode_setting_capable() const override final { return false; }
+    virtual bool double_framebuffering_capable() const override { return false; }
+    virtual ErrorOr<void> set_mode_setting(ModeSetting const&) override { return Error::from_errno(ENOTSUP); }
+    virtual ErrorOr<void> set_safe_mode_setting() override { return {}; }
+    virtual ErrorOr<void> set_y_offset(size_t) override { return Error::from_errno(ENOTSUP); }
+    virtual ErrorOr<void> unblank() override { return Error::from_errno(ENOTSUP); }
+
+    virtual bool partial_flush_support() const override final { return false; }
+    virtual bool flush_support() const override final { return false; }
+    // Note: This is possibly a paravirtualized hardware, but since we don't know, we assume there's no refresh rate...
+    virtual bool refresh_rate_support() const override final { return false; }
+
+    virtual ErrorOr<size_t> write_to_first_surface(u64 offset, UserOrKernelBuffer const&, size_t length) override final;
+    virtual ErrorOr<void> flush_first_surface() override final;
+
+    virtual void enable_console() override final;
+    virtual void disable_console() override final;
+
+    const PhysicalAddress m_framebuffer_address;
+    RefPtr<Graphics::GenericFramebufferConsole> m_framebuffer_console;
+    OwnPtr<Memory::Region> m_framebuffer_region;
+    u8* m_framebuffer_data {};
+};
+}