| 1 | /* $Id: VBox-doc.c 93422 2022-01-24 20:03:33Z vboxsync $ */
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| 2 | /** @file
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| 3 | * VirtualBox Top Level Documentation File.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2006-2022 Oracle Corporation
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| 8 | *
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| 9 | * This file is part of VirtualBox Open Source Edition (OSE), as
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| 10 | * available from http://www.virtualbox.org. This file is free software;
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| 11 | * you can redistribute it and/or modify it under the terms of the GNU
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| 12 | * General Public License (GPL) as published by the Free Software
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| 13 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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| 14 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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| 15 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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| 16 | */
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| 17 |
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| 18 |
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| 19 | /** @mainpage VirtualBox
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| 20 | *
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| 21 | * (add introduction here)
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| 22 | *
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| 23 | * @section pg_main_comp Components
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| 24 | *
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| 25 | * - VM / @ref pg_vmm "VMM" / GVM / @ref pg_gvmm "GVMM" - Virtual Machine
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| 26 | * Monitor.
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| 27 | * - @ref pg_cfgm
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| 28 | * - @ref pg_cpum
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| 29 | * - @ref pg_dbgf
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| 30 | * - @ref pg_dbgf_addr_space
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| 31 | * - @ref pg_dbgf_vmcore
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| 32 | * - @ref pg_dbgf_module
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| 33 | * - @ref pg_dbgc
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| 34 | * - VBoxDbg - Debugger GUI (Qt).
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| 35 | * - @ref grp_dis
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| 36 | * - @ref pg_em
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| 37 | * - @ref pg_gim
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| 38 | * - @ref pg_hm
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| 39 | * - @ref pg_iem
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| 40 | * - @ref pg_nem
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| 41 | * - @ref pg_gmm
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| 42 | * - @ref pg_mm
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| 43 | * - @ref pg_pgm
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| 44 | * - @ref pg_pgm_phys
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| 45 | * - @ref pg_pgm_pool
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| 46 | * - @ref pg_selm
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| 47 | * - @ref pg_iom
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| 48 | * - @ref pg_pdm
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| 49 | * - Devices / USB Devices, Drivers and their public interfaces.
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| 50 | * - Async I/O Completion API.
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| 51 | * - Async Task API.
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| 52 | * - Critical Section API.
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| 53 | * - Queue API.
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| 54 | * - Thread API.
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| 55 | * - @ref pg_pdm_block_cache
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| 56 | * - @ref pg_ssm
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| 57 | * - @ref pg_stam
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| 58 | * - @ref pg_tm
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| 59 | * - @ref pg_trpm
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| 60 | * - VMM docs:
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| 61 | * - @ref pg_vmm_guideline
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| 62 | * - @ref pg_raw
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| 63 | * - Pluggable Components (via PDM).
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| 64 | * - DevPCArch - PC Architecture Device (chipset, legacy ++).
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| 65 | * - DevPCBios - Basic Input Output System.
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| 66 | * - DevDMAC - DMA Controller.
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| 67 | * - DevPIC - Programmable Interrupt Controller.
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| 68 | * - DevPIT - Programmable Interval Timer (i8254).
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| 69 | * - DevRTC - Real Time Clock.
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| 70 | * - DevVGA - Video Graphic Array.
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| 71 | * - DevPCI - Peripheral Component Interface (Bus).
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| 72 | * - VBoxDev - Special PCI Device which serves as an interface between
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| 73 | * the VMM and the guest OS for the additions.
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| 74 | * - @ref pg_pdm_audio "Audio":
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| 75 | * - DevHda - Intel High Definition Audio Device Emulation.
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| 76 | * - DevIchAc97 - ICH AC'97 Device Emulation.
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| 77 | * - DevSB16 - SoundBlaster 16 Device Emulation.
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| 78 | * - DrvAudio - Intermediate driver.
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| 79 | * - DrvHostAudioAlsa - ALSA Host Audio Driver (Linux).
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| 80 | * - DrvHostAudioCoreAudio - Core Audio Host Audio Driver (macOS).
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| 81 | * - DrvHostAudioDebug - Debug Backend Driver.
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| 82 | * - DrvHostAudioDSound - DirectSound Host Audio Driver (Windows).
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| 83 | * - DrvHostAudioNull - NULL Backend Driver.
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| 84 | * - DrvHostAudioOss - Open Sound System Host Audio Driver (Linux,
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| 85 | * Solaris, ++).
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| 86 | * - DrvHostAudioPulseAudio - PulseAudio Host Audio Driver (Linux).
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| 87 | * - DrvHostAudioValidationKit - Validation Kit Test Driver.
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| 88 | * - DrvHostAudioWasApi - Windows Audio Session API Host Audio Driver.
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| 89 | * - Networking:
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| 90 | * - DevPCNet - AMD PCNet Device Emulation.
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| 91 | * - DevE1000 - Intel E1000 Device Emulation.
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| 92 | * - DevEEPROM - Intel E1000 EPROM Device Emulation.
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| 93 | * - SrvINetNetR0 - Internal Networking Ring-0 Service.
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| 94 | * - DevINIP - IP Stack Service for the internal networking.
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| 95 | * - DrvIntNet - Internal Networking Driver.
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| 96 | * - DrvNetSniffer - Wireshark Compatible Sniffer Driver (pass thru).
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| 97 | * - DrvNAT - Network Address Translation Driver.
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| 98 | * - DrvTAP - Host Interface Networking Driver.
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| 99 | * - Storage:
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| 100 | * - DevATA - ATA ((E)IDE) Device Emulation.
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| 101 | * - @ref pg_dev_ahci
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| 102 | * - DevFDC - Floppy Controller Device Emulation.
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| 103 | * - DrvBlock - Intermediate block driver.
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| 104 | * - DrvHostBase - Common code for the host drivers.
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| 105 | * - DrvHostDVD - Host DVD drive driver.
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| 106 | * - DrvHostFloppy - Host floppy drive driver.
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| 107 | * - DrvHostRawDisk - Host raw disk drive driver.
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| 108 | * - DrvMediaISO - ISO media driver.
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| 109 | * - DrvRawImage - Raw image driver (floppy images etc).
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| 110 | * - DrvVD - Intermediate Virtual Drive (Media) driver.
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| 111 | * - DrvVDI - VirtualBox Drive Image Container Driver.
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| 112 | * - DrvVmdk - VMDK Drive Image Container Driver.
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| 113 | * - USB:
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| 114 | * - @ref pg_dev_ohci
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| 115 | * - @ref pg_dev_ehci
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| 116 | * - @ref pg_dev_vusb
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| 117 | * - @ref pg_dev_vusb_old
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| 118 | * - Host Drivers.
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| 119 | * - SUPDRV - The Support driver (aka VBoxDrv).
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| 120 | * - @ref pg_sup
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| 121 | * - @ref pg_netflt
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| 122 | * - @ref pg_netadp
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| 123 | * - VBoxUSB - The USB support driver.
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| 124 | * - @ref pg_netflt
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| 125 | * - @ref pg_rawpci
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| 126 | * - Host Services.
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| 127 | * - @ref pg_hostclip
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| 128 | * - Shared Folders.
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| 129 | * - @ref pg_svc_guest_properties
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| 130 | * - @ref pg_svc_guest_control
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| 131 | * - Guest Additions.
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| 132 | * - VBoxGuest.
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| 133 | * - @ref pg_guest_lib
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| 134 | * - @ref pg_vgsvc
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| 135 | * - @ref pg_vgsvc_timesync
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| 136 | * - @ref pg_vgsvc_vminfo
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| 137 | * - @ref pg_vgsvc_vmstats
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| 138 | * - @ref pg_vgsvc_gstctrl
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| 139 | * - @ref pg_vgsvc_pagesharing
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| 140 | * - @ref pg_vgsvc_memballoon
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| 141 | * - @ref pg_vgsvc_cpuhotplug
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| 142 | * - @ref pg_vgsvc_automount
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| 143 | * - @ref pg_vgsvc_clipboard
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| 144 | * - VBoxControl.
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| 145 | * - Linux, Solaris and FreeBSD specific guest services and drivers.
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| 146 | * - @ref pg_vboxdrmcliet (Linux only).
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| 147 | * - VBoxClient.
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| 148 | * - VBoxVideo.
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| 149 | * - Windows Guests.
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| 150 | * - VBoxTray.
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| 151 | * - crOpenGL.
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| 152 | * - pam.
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| 153 | * - ...
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| 154 | * - Network Services:
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| 155 | * - @ref pg_net_dhcp
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| 156 | * - NAT
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| 157 | * - @ref pg_main
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| 158 | * - @ref pg_main_events
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| 159 | * - @ref pg_vrdb_usb
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| 160 | * - Frontends:
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| 161 | * - VirtualBox - The default Qt-based GUI.
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| 162 | * - VBoxHeadless - The headless frontend.
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| 163 | * - VBoxManage - The CLI.
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| 164 | * - VBoxShell - An interactive shell written in python.
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| 165 | * - VBoxSDL - A very simple GUI.
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| 166 | * - VBoxBFE - A bare metal edition which does not use COM/XPCOM (barely
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| 167 | * maintained atm).
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| 168 | * - IPRT - Runtime Library for hiding host OS differences.
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| 169 | * - Validation Kit:
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| 170 | * - @ref pg_validationkit_guideline
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| 171 | * - @ref pg_bs3kit
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| 172 | * - @ref pg_vbox_guideline
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| 173 | *
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| 174 | * @todo Make links to the components.
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| 175 | *
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| 176 | *
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| 177 | *
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| 178 | * @section Execution Contexts
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| 179 | *
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| 180 | * VirtualBox defines a number of different execution context, this can be
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| 181 | * confusing at first. So, to start with take a look at this diagram:
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| 182 | *
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| 183 | * @image html VMMContexts.png
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| 184 | *
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| 185 | * Context definitions:
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| 186 | * - Host context (HC) - This is the context where the host OS runs and
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| 187 | * runs VirtualBox within it. The absense of IN_RC and IN_GUEST
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| 188 | * indicates that we're in HC. IN_RING0 indicates ring-0 (kernel) and
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| 189 | * IN_RING3 indicates ring-3.
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| 190 | * - Raw-mode Context (RC) - This is the special VMM context where we
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| 191 | * execute the guest code directly on the CPU. Kernel code is patched
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| 192 | * and execute in ring-1 instead of ring-0 (ring compression). Ring-3
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| 193 | * code execute unmodified. Only VMMs use ring-1, so we don't need to
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| 194 | * worry about that (it's guarded against in the scheduler (EM)). We can
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| 195 | * in theory run ring-2 there, but since practially only only OS/2 uses
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| 196 | * ring-2, it is of little importance. The macro IN_RC indicates that
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| 197 | * we're compiling something for RC.
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| 198 | * Note! This used to be called GC (see below) earlier, so a bunch of RC
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| 199 | * things are using GC markers.
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| 200 | * - Guest Context (GC) - This is where the guest code is executed. When
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| 201 | * compiling, IN_GUEST indicates that it's for GC. IN_RING0 and
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| 202 | * IN_RING3 are also set when applicable, these are accompanied by
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| 203 | * IN_GUEST_R0 and IN_GUEST_R3 respecitively.
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| 204 | * - Intermediate context - This is a special memory context used within
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| 205 | * the world switchers (HC -> RC and back), it features some identity
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| 206 | * mapped code pages so we can switch to real mode if necessary.
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| 207 | *
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| 208 | */
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| 209 |
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