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32-545: It has also been used as a message for unrecoverable errors in software packages such as VirtualBox and other operating systems (see Legacy section below). The term "Guru Meditation Error" originated as an in-house joke in Amiga's early days. The company had a product called the Joyboard for the Atari 2600 home video game console , a game controller much like a joystick but operated by

64-440: A dynamic recompiler , based on QEMU to recompile any real mode or protected mode code entirely (e.g. BIOS code, a DOS guest, or any operating system startup). Using these techniques, VirtualBox could achieve performance comparable to that of VMware in its later versions. The feature was dropped starting with VirtualBox 6.1. Storage support includes: The supported operating systems include: Some features require

96-541: A "Guest Additions" package of device drivers and system applications is available, which typically improves performance, especially that of graphics, and allows changing the resolution of the guest OS automatically when the window of the virtual machine on the host OS is resized. Released under the terms of the GNU General Public License and, optionally, the CDDL for most files of the source distribution, VirtualBox

128-588: A custom virtual graphics-card that is VBE or UEFI GOP compatible. The Guest Additions for Windows, Linux, Solaris, OpenSolaris, and OS/2 guests include a special video-driver that increases video performance and includes additional features, such as automatically adjusting the guest resolution when resizing the VM window and desktop composition via virtualized WDDM drivers. For an Ethernet network adapter, VirtualBox virtualizes these Network Interface Cards : The emulated network cards allow most guest OSs to run without

160-407: A host network adapter or virtual networks between guests can also be configured. Up to 36 network adapters can be attached simultaneously, but only four are configurable through the graphical interface. For a sound card, VirtualBox virtualizes Intel HD Audio, Intel ICH AC'97, and SoundBlaster 16 devices. A USB 1.1 controller is emulated, so that any USB devices attached to the host can be seen in

192-399: A number of mechanisms including a common clipboard and a virtualized network facility. Guest VMs can also directly communicate with each other if configured to do so. VirtualBox supports both Intel 's VT-x and AMD 's AMD-V hardware-assisted virtualization. Making use of these facilities, VirtualBox can run each guest VM in its own separate address-space; the guest OS ring 0 code runs on

224-400: A rare series of events, as in when a deprecated Kickstart (example: 1.1) program conditionally boots from disk on a more advanced Kickstart 3.x ROM Amiga running in compatibility mode (therefore eschewing the on-disk OS) and crashes with a red Guru Meditation but subsequently restores itself by pressing the left mouse button, the newer Kickstart recognizing an inadvised low level chipset call for

256-414: A single host operating-system (host OS). Each guest can be started, paused and stopped independently within its own virtual machine (VM). The user can independently configure each VM and run it under a choice of software-based virtualization or hardware assisted virtualization if the underlying host hardware supports this. The host OS and guest OSs and applications can communicate with each other through

288-546: A system software error. The second can be the address of a Task structure, or the address of a memory block whose allocation or deallocation failed. It is never the address of the code that caused the error. If the cause of the crash is uncertain, this number is rendered as 48454C50 , which stands for "HELP" in hexadecimal ASCII characters (48=H, 45=E, 4C=L, 50=P). There was a commercially available error handler for AmigaOS, before version 2.04, called GOMF (Get Outta My Face) made by Hypertek/Silicon Springs Development corp. It

320-570: Is free and open-source software , though the Extension Pack is proprietary software , free of charge only to personal users. The License to VirtualBox was relicensed to GPLv3 with linking exceptions to the CDDL and other GPL-incompatible licenses. VirtualBox was first offered by InnoTek Systemberatung GmbH, a German company based in Weinstadt , under a proprietary software license, making one version of

352-430: Is free software under GNU General Public License version 2 (GPLv2). A supplementary package, under a proprietary license, adds support for USB 2.0 and 3.0 devices, Remote Desktop Protocol (RDP), disk encryption, NVMe , and Preboot Execution Environment (PXE). This package is called "VirtualBox Oracle VM VirtualBox extension pack". It includes closed-source components, so it is not source-available . The license

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384-399: Is a minimalist debugger built into the operating system which is accessible by connecting a 9600 bit /s terminal to the serial port . The alert itself appears as a black rectangular box located in the upper portion of the screen. Its border and text are red for a normal Guru Meditation, or green/yellow for a Recoverable Alert, another kind of Guru Meditation. The screen may go black, but

416-593: Is called Personal Use and Evaluation License (PUEL) . It allows gratis access for personal use, educational use, and evaluation. Since VirtualBox version 5.1.30, Oracle defines personal use as installation on a single computer for non-commercial purposes. Prior to version 4, there were two different packages of the VirtualBox software. The full package was offered gratis under the PUEL, with licenses for other commercial deployment purchasable from Oracle. A second package called

448-588: The Debian Free Software Guidelines do not consider it "free". VirtualBox has experimental support for macOS guests. However, macOS's end user license agreement does not permit running on non-Apple hardware. The operating system enforces this by calling the Apple System Management Controller (SMC), to verify the hardware's authenticity. All Apple machines have an SMC. Users of VirtualBox can load multiple guest OSes under

480-720: The VirtualBox Open Source Edition (OSE) was released under GPLv2. This removed the same proprietary components not available under GPLv2. Since version 4.2 , building the BIOS for VirtualBox requires the Open Watcom compiler, which is released under the Sybase Open Watcom Public License . The Open Source Initiative has approved this as "Open Source" but the Free Software Foundation and

512-747: The "additions" code in both Windows Virtual PC and Microsoft Virtual Server , which enables various host–guest OS interactions like shared clipboards or dynamic viewport resizing. Sun Microsystems acquired InnoTek in February 2008. Following the acquisition of Sun Microsystems by Oracle Corporation in January 2010, the product was re-branded as "Oracle VM VirtualBox". In December 2019, VirtualBox removed support for software-based virtualization and exclusively performs hardware-assisted virtualization . The core package, since version 4 in December 2010,

544-459: The absence of hardware-assisted virtualization, versions 6.0.24 and earlier of VirtualBox could adopt a standard software-based virtualization approach. This mode supports 32-bit guest operating systems which run in rings 0 and 3 of the Intel ring architecture. In both cases, VirtualBox uses CSAM and PATM to inspect and patch the offending instructions whenever a fault occurs. VirtualBox also contains

576-522: The feet, similar to the Wii Balance Board . Early in the development of the Amiga computer operating system, the company's developers became so frustrated with the system's frequent crashes that, as a relaxation technique, a game was developed where a person would sit cross-legged on the Joyboard, resembling an Indian guru . The player tried to remain extremely still; the winner of the game stayed still

608-447: The guest. The proprietary extension pack adds a USB 2.0 or USB 3.0 controller and, if VirtualBox acts as an RDP server, it can also use USB devices on the remote RDP client, as if they were connected to the host, although only if the client supports this VirtualBox-specific extension (Oracle provides clients for Solaris, Linux, and Sun Ray thin clients that can do this, and has promised support for other platforms in future versions). In

640-636: The host at ring 0 in VMX non-root mode rather than in ring 1. Starting with version 6.1, VirtualBox only supports this method. Until then, VirtualBox specifically supported some guests (including 64-bit guests, SMP guests and certain proprietary OSs) only on hosts with hardware-assisted virtualization . VirtualBox emulates hard disks in three formats: the native VDI (Virtual Disk Image), VMware 's VMDK , and Microsoft 's VHD . It thus supports disks created by other hypervisor software. VirtualBox can also connect to iSCSI targets and to raw partitions on

672-524: The host, using either as virtual hard disks. VirtualBox emulates IDE (PIIX4 and ICH6 controllers), SCSI , SATA (ICH8M controller), and SAS controllers, to which hard drives can be attached. VirtualBox has supported Open Virtualization Format (OVF) since version 2.2.0 (April 2009). Both ISO images and physical devices connected to the host can be mounted as CD or DVD drives. VirtualBox supports running operating systems from live CDs and DVDs . By default, VirtualBox provides graphics support through

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704-579: The installation of the closed-source "VirtualBox Extension Pack": While VirtualBox itself is free to use and is distributed under an open source license the VirtualBox Extension Pack is licensed under the VirtualBox Personal Use and Evaluation License (PUEL). Personal use of the extension pack is free but commercial users need to purchase a license. Guest Additions are installed within each guest virtual machine which supports them;

736-518: The longest. If the player moved too much, a "guru meditation" error occurred. The alert occurred when there was a fatal problem with the system. If the system had no means of recovery, it could display the alert, even in systems with numerous critical flaws. In extreme cases, the alert could even be displayed if the system's memory was completely exhausted. The text of the alert messages was completely baffling to most users. Only highly technically adept Amiga users would know, for example, that exception 3

768-524: The need to find and install drivers for networking hardware as they are shipped as part of the guest OS. A special paravirtualized network adapter is also available, which improves network performance by eliminating the need to match a specific hardware interface, but requires special driver support in the guest. (Many distributions of Linux ship with this driver included.) By default, VirtualBox uses NAT through which Internet software for end-users such as Firefox or ssh can operate. Bridged networking via

800-480: The older ROM directly poking the hardware, and addressing it. The error is displayed as two fields , separated by a period. The format is #0000000x.yyyyyyyy in case of a CPU error, or #aabbcccc.dddddddd in case of a system software error. The first field is either the Motorola 68000 exception number that occurred (if a CPU error occurs) or an internal error identifier (such as an "Out of Memory" code), in case of

832-458: The power LEDs always alternates between full and half-brightness for a few seconds before the alert appears. In AmigaOS 1.x, programmed in ROMs known as Kickstart 1.1, 1.2 and 1.3, the errors are always red. In AmigaOS 2.x and 3.x, recoverable alerts are yellow, except for some very early versions of 2.x where they were green. Dead-end alerts are always red and terminal in all OS versions except in

864-636: The product available at no cost for personal or evaluation use, subject to the VirtualBox Personal Use and Evaluation License (PUEL). In January 2007, based on counsel by LiSoG , InnoTek released VirtualBox Open Source Edition (OSE) as free and open-source software , subject to the requirements of the GNU General Public License (GPL), version 2. InnoTek also contributed to the development of OS/2 and Linux support in virtualization and OS/2 ports of products from Connectix which were later acquired by Microsoft . Specifically, InnoTek developed

896-407: The system may be in an unpredictable state that can cause data corruption. The first byte specifies the area of the system affected. The top bit will be set if the error is a dead end alert. VirtualBox Oracle VirtualBox (formerly Sun VirtualBox , Sun xVM VirtualBox and InnoTek VirtualBox ) is a hosted hypervisor for x86 virtualization developed by Oracle Corporation . VirtualBox

928-423: The user from all errors, as one may have still seen this error occasionally. Recoverable Alerts are non-critical crashes in the computer system. In most cases, it is possible to resume work and save files after a Recoverable Alert, while a normal, red Guru Meditation always results in an immediate reboot. It is, however, still recommended to reboot as soon as possible after encountering a Recoverable Alert, because

960-485: Was able to deal with many kinds of errors and gave the user a choice to either remove the offending process and associated screen, or allow the machine to show the Guru Meditation. In many cases, removal of the offending process gave one the choice to save one's data and exit running programs before rebooting the system. When the damage was not extensive, one was able to continue using the machine. However, it did not save

992-423: Was an address error, and meant the program was accessing a word on an unaligned boundary. Users without this specialized knowledge would have no recourse but to look for a "Guru" or to simply reboot the machine and hope for the best. When a Guru Meditation is displayed, the options are to reboot by pressing the left mouse button, or to invoke ROMWack by pressing the right mouse button or to manually reboot. ROMWack

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1024-547: Was originally created by InnoTek Systemberatung GmbH, which was acquired by Sun Microsystems in 2008, which was in turn acquired by Oracle in 2010. VirtualBox may be installed on Microsoft Windows , macOS , Linux , Solaris and OpenSolaris . There are also ports to FreeBSD and Genode . It supports the creation and management of guest virtual machines running Windows, Linux, BSD , OS/2 , Solaris, Haiku , and OSx86 , as well as limited virtualization of macOS guests on Apple hardware. For some guest operating systems,

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