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+/* $Id: VBox-doc.c $ */
+/** @file
+ * VirtualBox Top Level Documentation File.
+ */
+
+/*
+ * Copyright (C) 2006-2022 Oracle and/or its affiliates.
+ *
+ * This file is part of VirtualBox base platform packages, as
+ * available from https://www.virtualbox.org.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation, in version 3 of the
+ * License.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <https://www.gnu.org/licenses>.
+ *
+ * SPDX-License-Identifier: GPL-3.0-only
+ */
+
+
+/** @mainpage VirtualBox
+ *
+ * (add introduction here)
+ *
+ * @section pg_main_comp Components
+ *
+ * - VM / @ref pg_vmm "VMM" / GVM / @ref pg_gvmm "GVMM" - Virtual Machine
+ * Monitor.
+ * - @ref pg_cfgm
+ * - @ref pg_cpum
+ * - @ref pg_dbgf
+ * - @ref pg_dbgf_addr_space
+ * - @ref pg_dbgf_vmcore
+ * - @ref pg_dbgf_module
+ * - @ref pg_dbgc
+ * - VBoxDbg - Debugger GUI (Qt).
+ * - @ref grp_dis
+ * - @ref pg_em
+ * - @ref pg_gim
+ * - @ref pg_hm
+ * - @ref pg_iem
+ * - @ref pg_nem
+ * - @ref pg_gmm
+ * - @ref pg_mm
+ * - @ref pg_pgm
+ * - @ref pg_pgm_phys
+ * - @ref pg_pgm_pool
+ * - @ref pg_selm
+ * - @ref pg_iom
+ * - @ref pg_pdm
+ * - Devices / USB Devices, Drivers and their public interfaces.
+ * - Async I/O Completion API.
+ * - Async Task API.
+ * - Critical Section API.
+ * - Queue API.
+ * - Thread API.
+ * - @ref pg_pdm_block_cache
+ * - @ref pg_ssm
+ * - @ref pg_stam
+ * - @ref pg_tm
+ * - @ref pg_trpm
+ * - VMM docs:
+ * - @ref pg_vmm_guideline
+ * - @ref pg_raw
+ * - Pluggable Components (via PDM).
+ * - DevPCArch - PC Architecture Device (chipset, legacy ++).
+ * - DevPCBios - Basic Input Output System.
+ * - DevDMAC - DMA Controller.
+ * - DevPIC - Programmable Interrupt Controller.
+ * - DevPIT - Programmable Interval Timer (i8254).
+ * - DevRTC - Real Time Clock.
+ * - DevVGA - Video Graphic Array.
+ * - DevPCI - Peripheral Component Interface (Bus).
+ * - VBoxDev - Special PCI Device which serves as an interface between
+ * the VMM and the guest OS for the additions.
+ * - @ref pg_pdm_audio "Audio":
+ * - DevHda - Intel High Definition Audio Device Emulation.
+ * - DevIchAc97 - ICH AC'97 Device Emulation.
+ * - DevSB16 - SoundBlaster 16 Device Emulation.
+ * - DrvAudio - Intermediate driver.
+ * - DrvHostAudioAlsa - ALSA Host Audio Driver (Linux).
+ * - DrvHostAudioCoreAudio - Core Audio Host Audio Driver (macOS).
+ * - DrvHostAudioDebug - Debug Backend Driver.
+ * - DrvHostAudioDSound - DirectSound Host Audio Driver (Windows).
+ * - DrvHostAudioNull - NULL Backend Driver.
+ * - DrvHostAudioOss - Open Sound System Host Audio Driver (Linux,
+ * Solaris, ++).
+ * - DrvHostAudioPulseAudio - PulseAudio Host Audio Driver (Linux).
+ * - DrvHostAudioValidationKit - Validation Kit Test Driver.
+ * - DrvHostAudioWasApi - Windows Audio Session API Host Audio Driver.
+ * - Networking:
+ * - DevPCNet - AMD PCNet Device Emulation.
+ * - DevE1000 - Intel E1000 Device Emulation.
+ * - DevEEPROM - Intel E1000 EPROM Device Emulation.
+ * - SrvINetNetR0 - Internal Networking Ring-0 Service.
+ * - DevINIP - IP Stack Service for the internal networking.
+ * - DrvIntNet - Internal Networking Driver.
+ * - DrvNetSniffer - Wireshark Compatible Sniffer Driver (pass thru).
+ * - DrvNAT - Network Address Translation Driver.
+ * - DrvTAP - Host Interface Networking Driver.
+ * - Storage:
+ * - DevATA - ATA ((E)IDE) Device Emulation.
+ * - @ref pg_dev_ahci
+ * - DevFDC - Floppy Controller Device Emulation.
+ * - DrvBlock - Intermediate block driver.
+ * - DrvHostBase - Common code for the host drivers.
+ * - DrvHostDVD - Host DVD drive driver.
+ * - DrvHostFloppy - Host floppy drive driver.
+ * - DrvHostRawDisk - Host raw disk drive driver.
+ * - DrvMediaISO - ISO media driver.
+ * - DrvRawImage - Raw image driver (floppy images etc).
+ * - DrvVD - Intermediate Virtual Drive (Media) driver.
+ * - DrvVDI - VirtualBox Drive Image Container Driver.
+ * - DrvVmdk - VMDK Drive Image Container Driver.
+ * - USB:
+ * - @ref pg_dev_ohci
+ * - @ref pg_dev_ehci
+ * - @ref pg_dev_vusb
+ * - @ref pg_dev_vusb_old
+ * - Host Drivers.
+ * - SUPDRV - The Support driver (aka VBoxDrv).
+ * - @ref pg_sup
+ * - @ref pg_netflt
+ * - @ref pg_netadp
+ * - VBoxUSB - The USB support driver.
+ * - @ref pg_netflt
+ * - @ref pg_rawpci
+ * - Host Services.
+ * - @ref pg_hostclip
+ * - Shared Folders.
+ * - @ref pg_svc_guest_properties
+ * - @ref pg_svc_guest_control
+ * - Guest Additions.
+ * - VBoxGuest.
+ * - @ref pg_guest_lib
+ * - @ref pg_vgsvc
+ * - @ref pg_vgsvc_timesync
+ * - @ref pg_vgsvc_vminfo
+ * - @ref pg_vgsvc_vmstats
+ * - @ref pg_vgsvc_gstctrl
+ * - @ref pg_vgsvc_pagesharing
+ * - @ref pg_vgsvc_memballoon
+ * - @ref pg_vgsvc_cpuhotplug
+ * - @ref pg_vgsvc_automount
+ * - @ref pg_vgsvc_clipboard
+ * - VBoxControl.
+ * - Linux, Solaris and FreeBSD specific guest services and drivers.
+ * - @ref pg_vboxdrmcliet (Linux only).
+ * - VBoxClient.
+ * - VBoxVideo.
+ * - Windows Guests.
+ * - VBoxTray.
+ * - crOpenGL.
+ * - pam.
+ * - ...
+ * - Network Services:
+ * - @ref pg_net_dhcp
+ * - NAT
+ * - @ref pg_main
+ * - @ref pg_main_events
+ * - @ref pg_vrdb_usb
+ * - Frontends:
+ * - VirtualBox - The default Qt-based GUI.
+ * - VBoxHeadless - The headless frontend.
+ * - VBoxManage - The CLI.
+ * - VBoxShell - An interactive shell written in python.
+ * - VBoxSDL - A very simple GUI.
+ * - VBoxBFE - A bare metal edition which does not use COM/XPCOM (barely
+ * maintained atm).
+ * - IPRT - Runtime Library for hiding host OS differences.
+ * - Validation Kit:
+ * - @ref pg_validationkit_guideline
+ * - @ref pg_bs3kit
+ * - @ref pg_vbox_guideline
+ *
+ * @todo Make links to the components.
+ *
+ *
+ *
+ * @section Execution Contexts
+ *
+ * VirtualBox defines a number of different execution context, this can be
+ * confusing at first. So, to start with take a look at this diagram:
+ *
+ * @image html VMMContexts.png
+ *
+ * Context definitions:
+ * - Host context (HC) - This is the context where the host OS runs and
+ * runs VirtualBox within it. The absense of IN_RC and IN_GUEST
+ * indicates that we're in HC. IN_RING0 indicates ring-0 (kernel) and
+ * IN_RING3 indicates ring-3.
+ * - Raw-mode Context (RC) - This is the special VMM context where we
+ * execute the guest code directly on the CPU. Kernel code is patched
+ * and execute in ring-1 instead of ring-0 (ring compression). Ring-3
+ * code execute unmodified. Only VMMs use ring-1, so we don't need to
+ * worry about that (it's guarded against in the scheduler (EM)). We can
+ * in theory run ring-2 there, but since practially only only OS/2 uses
+ * ring-2, it is of little importance. The macro IN_RC indicates that
+ * we're compiling something for RC.
+ * Note! This used to be called GC (see below) earlier, so a bunch of RC
+ * things are using GC markers.
+ * - Guest Context (GC) - This is where the guest code is executed. When
+ * compiling, IN_GUEST indicates that it's for GC. IN_RING0 and
+ * IN_RING3 are also set when applicable, these are accompanied by
+ * IN_GUEST_R0 and IN_GUEST_R3 respecitively.
+ * - Intermediate context - This is a special memory context used within
+ * the world switchers (HC -> RC and back), it features some identity
+ * mapped code pages so we can switch to real mode if necessary.
+ *
+ */
+