OSx86

The OSx86 Project logo

OSx86 (from Mac OS X and x86) is a collaborative hacking project to run the Mac OS X computer operating system on non-Apple personal computers with x86 architecture and x86-64 compatible processors. The effort started soon after the June 2005 Worldwide Developers Conference announcement that Apple would be transitioning its personal computers from PowerPC to Intel microprocessors.

A computer built to run this type of Mac OS X is also known as a Hackintosh,^[1] a portmanteau of the word "hack" and the name of Apple's main brand of computers, Macintosh. Hackintoshed notebook computers are also referred to as "Hackbooks".

The Apple software license does not allow Mac OS X to be used on a computer that is not "Apple-branded".^[2] The legality of this form of tying is disputed by companies such as Psystar, Bizon computer, PearC and MacPC who have attempted to release products using Mac OS on non Apple-machines. However, Apple claims the methods it uses to prevent Mac OS X from being installed on non-Apple hardware are protected by the DMCA, and in November 2009 won a summary judgement against Psystar on these grounds.^[3]

Legal issues and Apple objections

Apple's transition to Intel processors
Architecture Universal binary Boot Camp Rosetta This box: view · talk · edit

Apple does not authorize the use of the Mac OS on any x86 PC other than the ones it has developed itself. The company used a Trusted Platform Module, or TPM, to tie Mac OS to the systems it distributed to developers after announcing its switch to Intel's chips.^[4]

The Mac OS X EULA forbids installations of Mac OS X on a "non-Apple-branded computer".^[2] On July 3, 2008, Apple filed a lawsuit against Psystar Corporation^[5] for violating this restriction, among other claims.^[6] Apple claimed Psystar "violated the Digital Millennium Copyright Act (DMCA) by dodging copy-protection technologies Apple uses to protect Mac OS X. "Apple employs technological protection measures that effectively control access to Apple's copyrighted works [...] Defendant has illegally circumvented Apple's technological copyright-protection measures." Specifically, Apple charged Psystar with acquiring or creating code that "avoids, bypasses, removes, descrambles, decrypts, deactivates or impairs a technological protection measure without Apple's authority for the purpose of gaining unauthorized access to Apple's copyrighted works."^[7] This brief revealed that Apple considers the methods that it uses to prevent Mac OS X from being installed on non-Apple hardware to be protected by the DMCA.

On November 13, 2009, the court granted Apple's motion for summary judgment and found Apple's copyrights were violated as well as the Digital Millennium Copyright Act (DMCA) when Psystar installed Apple's operating system on non-Apple computers. A hearing on remedies was set for December 14.^[3][8]

On January 14, 2009, the Gadget Lab site of Wired Magazine posted a video tutorial for installing Mac OS X on an MSI Wind netbook, but removed it following a complaint from Apple.^[9] Textual instructions remain, but include an EULA violation disclaimer.^[10]

Developer Transition Kit

Efforts to run Mac OS X on non-Apple hardware utilized leaked copies of pre-release software. On June 6, 2005 Apple announced the availability of a Developer Transition Kit. This kit was made available to registered developers at a cost of $999.^[11] The first patches circumvented the Trusted Platform Module (TPM) that was included on the motherboard of the Developer Transition Kits. The TPM was required by the Rosetta technology that allowed software compiled for the PowerPC architecture to run on Intel-based architecture. Removing this requirement allowed Mac OS X to be installed on non-Apple computers. Rosetta also required microprocessors that included SSE3 instructions. Patches were released to the community which emulated these instructions with SSE2 equivalents and allowed the installation on machines without SSE3 support, although this produced a performance penalty. Being beta software, many updates followed its release.

In October 2005, Apple released update 10.4.3 to developers that required NX bit microprocessor support;^[12] however, patches were released to circumvent this.^[13]

Hacking approaches

Kernel hacks

Mac OS X 10.4.4 "Tiger"

MSI Wind running Mac OS X

On January 10, 2006, Apple released Mac OS X 10.4.4 with the first generation of Intel-based Macs, the iMac and the MacBook Pro. These machines used Extensible Firmware Interface (EFI) platform firmware instead of the legacy BIOS found on most x86 motherboards. On February 14, 2006, an initial "hack" of Mac OS X v10.4.4 was released on the Internet by a programmer with the pseudonym crg92.^[14] Within hours Apple released the 10.4.5 update,^[15] which was patched again by the same author within two weeks.^[16] On April 3, 2006 Apple released their 10.4.6 update^[17] and again patches were released within two weeks that allowed users to install most of this update on non-Apple computers, although this did not include the updated kernel in 10.4.6. In June, the hackers released the 10.4.7 Mac OS X update for non-Apple computers using the 10.4.4 kernel.

Up to the release of the 10.4.8 update, all OSx86 patches used the 10.4.4 kernel with the rest of the operating system at version 10.4.8. However, the newer frameworks relied on the newer kernels and this led to users of 10.4.8 encountering many problems. Apple also started making more use of SSE3 instructions on their hardware making it even more difficult for users with CPUs supporting only SSE2 (such as older Pentium 4's) to get a fully compatible system running.

XNU kernel patch

Two programmers, working under the pseudonyms Mifki or Vitaliy and Semthex, released new kernels by starting with the open source XNU tree and applying patches necessary to run the kernel on non-Apple hardware. Mifki's goal was to release the kernel with as few patches as possible, able to run on close-to-Apple hardware. Semthex's goal was to make his kernel more compatible with legacy hardware with the omission of some crucial features.

Both kernels allowed most of the updated kernel extensions/frameworks to work, making properly configured PCs operate more like genuine Apple computers. While Mifki has only updated his kernel once, Semthex updates it regularly and added AMD, VMware and SSE2-support in later versions. Semthex released his hacked kernel source code on his webpage. On December 24, 2006 he also released the latest patches for the SSE3 kernel as a diff file for his original source tree as a Christmas present to the community. The SSE2 emulation that Semthex developed with Rufus was the first fully complete emulation of all SSE3 instructions to be presented to the OSx86 community. The previous SSE2 emulation was incomplete, only emulating 3 of the available SSE3 instructions, and very inefficient compared to the new emulator. The new emulator enabled even SSE2 OSx86 users to run SSE3 based applications such as iTunes 7 and most 3D programs.

In the early days of 10.4.8, an Intel-SSE3 only install DVD was released by JaS, which included Vitaliy's and Semthex's kernel. A few weeks later, a hacker calling himself tubgirl released an AMD-SSE3 install DVD. With Semthex's successful completion of the SSE2 Kernel, JaS released an SSE2-SSE3 universal DVD and announced his retirement from hacking Mac OS X after seven successful DVD releases. However, on August 9, 2008, JaS released yet another distribution featuring both a client and server version of Mac OS 10.5.4.

Mac OS X v10.5 "Leopard"

Mac OS X v10.5 installing on a Lenovo laptop computer.

As early as Mac OS X v10.5 build 9A466 the community has maintained a version of Leopard that can run on non-Apple hardware. A hacker by the handle of BrazilMac created one of the earliest patching processes which made it convenient for users to install Mac OS X onto 3rd party hardware by using a legally obtained, retail version of Apple Mac OS X. It was utilizing the BrazilMac patch that many effortless distros of Mac OSx86 came to fruition. Five of the most popular builds go by the name JaS, Kalyway, iATKOS, iPC and iDeneb - although more recently these builds are on the way out as the Boot-132 method (described below) gains popularity. However, all of these compilations rely on the work of kernel hackers made by Lorem (build 9A466), SynthetiX (builds 9A499, 9A527 and 9A559), ToH (builds 9A581, 9B13 and 9B18) and more recently a group calling themselves StageXNU (now called Voodoo) (Darwin 9.4.0). Their contributions trickled down into the various Mac OSx86 installers, readily available on the internet. There continue to be refined and updated builds released, not just to maintain compatibility with Apple releases but an ever increasing number of third party components. The OSx86 community has been quick to make the necessary modifications to enable Apple's latest releases to run on non-Apple hardware. Within hours of Leopard's release, an AMD/Intel SSE2/3 Kernel Patcher was created which removed the HPET requirement from an original untouched mach_kernel file, a core component of the Mac OS.

Mac OS X v10.6 "Snow Leopard"

When "Snow Leopard" was released, Russian hacker netkas created a version of Chameleon which can boot Mac OS X v10.6. The main problem was that many people were forced to modify DSDT or use kexts due to some specific issues. As soon as possible modbin and dmitrik have released test versions of kernel that allow to boot Snow Leopard on AMD machines. Stable XNU kernels for v10.6 were released by Qoopz and Pcj. There are some popular builds based on Retail by the name Universal (Intel only), Hazard, and iAtkos. Since v10.6.2 Nawcom, Qoopz, and Andy Vandijck have been working on Legacy kernel for unsupported CPUs.

Mac OS X v10.7 "Lion"

When Apple had released the Developer Preview 1, Russian Hackintosh developer usr-sse2 was the first who created a method to install Lion. The method consists in deploying Mac OS X v10.7 image on a flash drive, and booting from it through XPC UEFI Bootloader (See DUET below). After some changes were made to the Chameleon source code, booting of Lion was possible with an updated version of Chameleon. First distribution based on a new version of OS is iAtkos L1 (Intel only). Lion still doesn't work on AMD PC's yet as there is not yet a kernel yet .

Boot loaders and emulators

EFI emulation

Extensible Firmware Interface (EFI) is a specification that defines a software interface between an operating system and platform firmware. Since this method generally does not require copying or modification of Mac OS X, it is the considered to be the most legal way of installing Mac OS X on non-Apple computers.

In early November 2007, a group of hackers (fronted by a Russian hacker known as Netkas), using an already modified boot-132 source root from David Elliot (also known as dfe),^[18] developed a method^[19] of emulating an EFI environment using a specially modified Darwin boot loader.^[20] In practical terms, this meant that regular PCs meeting a minimum set of hardware requirements could now be "seen" as real Macintosh computers by the OS, allowing the use of unmodified, "stock" Apple kernels (as long as the CPU supports it) and thus giving a more transparent and reliable operation. Several methods for real world deployment of this innovative solution have arisen all around the Internet. An explanation of this achievement along with a usage guide was provided by the website DigitMemo.com.^[21]

True EFI emulation was a highly sought after asset for the OSx86 community. Previous efforts based upon Apple’s open source Darwin Project and Hackintosh gurus allowed users to use Mac OS X on normal PCs, with patched kernels/kernel modules which simply bypassed EFI. Using the EFI patch, a Hackintosh could boot off "vanilla" (unmodified) Mac OS X kernels and use vanilla kernel extensions. This not only allowed the system to be compatible with future system updates, but also offered increased stability. This method also circumvents one aspect of Apple's End User License Agreement, which states that the modification of non-open Source components of the OS is forbidden.^[2]

In mid-2008, a new commercial product, EFi-X, was released that claims to allow full, simple booting off official Leopard install disks, and a subsequent install, without any patching required, but this is possibly a repackaging of Boot-132 technology.^[22] Rebel EFI is another commercial product that also seems to use open source software.^[23]

It was thought that Windows 7 support of EFI would result in PC motherboards replacing BIOS with EFI. MSI announced the Efinity mainboard in early 2008, but it (and similar products) have not been sold.

Boot-132

Boot-132 is a boot loader provided by Apple for loading the XNU kernel.^[24] In mid-2008, a new modified BOOT-132 came on to the scene.^[25] This method allows users to conduct the Leopard-based OSx86 installation using a stock, retail purchased copy of Mac OS X Leopard and eradicates the necessity of a hacked installation like JaS or Kalyway (mentioned previously). The Boot-132 boot loader essentially preloads an environment on the system from which Leopard can boot and operate. The boot loader stores the necessary files (kext files) in a .img collection or simply a folder. The luxury of this new installation method includes the ability to boot and install from a retail Leopard DVD and update straight from Apple without breaking the DMCA. The only possible problem here is that it breaks the Mac OS X EULA.^[26]

The boot loader behaves like the linux kernel: one can use an mboot-compatible (a patched syslinux was used for the hack) boot loader which tells boot-dfe about the .img file (the ramdisk or initrd, as it's known by linux users), and boot-dfe will then use the kexts (or mkext) from it. This new boot-dfe has been tested with the retail Leopard DVD, and it can boot, install, and run Leopard without having to build a modified DVD.

This however only works with compatible machines. One notable exception, that since the release of the Voodoo kernel in December 2008,^[27] AMD users have been able to run Retail. Non-Core users can run Retail by using any compatible kernel. Both methods require the placing of the hacked kernel on the boot-132 disc.

Chameleon

Since the early developer builds of Mac OS X v10.6, members of the OSx86 community had been booting the new operating system using yet another boot loader called PC EFI provided by Russian hacker Netkas or the boot loader of the Voodoo team Chameleon. Chameleon is based on David Elliot's BOOT-132. The bootloader supports ACPI, SMBIOS, graphics, ethernet, and some other injections. It allows to boot up Mac OS X on a different to Macintosh hardware. There are many branches of Chameleon by different developers.Chameleon now supports a lot of AMD as well as Nvidia Graphics Cards . Chameleon is currently in the 2.1 development state .

DUET

DUET is a boot loader developed by Tianocore that enables you to "boot" into an EFI environment in a non-EFI computer that supports legacy boot.^[28] Some OSx86 boot loaders, like iBOOT^[29] and XPC,^[30] are based on DUET's source and enable you to create a flash drive and boot Mac OS X from an EFI environment. While Boot-132 injects EFI data into the XNU kernel and then loads Mac OS X via the Darwin Boot loader,^[31] iBOOT and XPC are based on EFI directly that boots Mac OS X without any other boot loader. This enables users to load rEFIt directly on PC hardware. This can be done by either replacing the "efi" folder on the flash drive^[32] or by installing the rEFIt boot loader on any Mac OS X partition.

Live DVD

In March 2007, the OSx86 community made some significant progress with the development of a Live DVD. The Live DVD allows booting to a working system with Mac OS X v10.4.8.

On January 2, 2009, InsanelyMac's Live DVD team published a new method by which a Mac OS X v10.5.x Live DVD could be produced, allowing users to boot a fully working Mac OS X desktop from a DVD or USB flash drive.^[33] The method was more reliable than previous methods because it manipulated Apple's existing Netboot and Imageboot functionalities and behaved as if the system were running off a network disk. It was easier to produce; requiring only a single script to be added to an existing installation. Distributions of the live DVD have been made since its inception. It is notable that this method has been shown to work on normal Apple Mac hardware since.

Virtual machine

It is also possible to run the Mac OS as a virtual machine inside of other operating systems installed on standard PC hardware, by using virtualization software such as such as Oracle's VirtualBox ^[34][35] (although this usage is considered to be a violation of Apple's licensing agreements and not officially supported by Oracle ^[36]). This method typically utilizes some of the modified OS software listed above to perform the actual install.

See also

• Macintosh clone - About clones and emulators of various Macintosh models
• List of computer system emulators - a list of Macintosh and other computer system emulators

References

1. ^ David Ramsey. "Turning PC into Apple Macintosh: Hackintosh". BenchmarkReviews.com. http://benchmarkreviews.com/index.php?option=com_content&task=view&id=623&Itemid=38. Retrieved 2010-10-10. 
2. ^ ^{a b c} Apple Inc.. "Apple Inc. Software License Agreement for Mac OS X" (PDF). Apple Inc.. http://images.apple.com/legal/sla/docs/macosx106.pdf. Retrieved 2010-09-02. 
3. ^ ^{a b} Keizer, Greg (2009-11-15). "Apple Wins Court Victory Over Mac Clone Maker Psystar". PC World. http://www.pcworld.com/article/182218/Apple_Wins_Court_Victory_Over_Mac_Clone_Maker_Psystar.html?tk=rss_news. Retrieved November 15, 2009. 
4. ^ "DMCA axes sites discussing Mac OS for PCs"
5. ^ Fried, Ina (2008-07-15). "Apple sues clone maker Psystar". News.cnet.com. http://news.cnet.com/8301-13860_3-9991572-56.html. Retrieved 2009-04-28. 
6. ^ July 15th, 2008 (2008-07-15). "Apple Goes After Clone Maker Psystar". Espinosaiplaw.com. http://espinosaiplaw.com/wordpress/?p=41. Retrieved 2009-04-28. 
7. ^ Keizer, Gregg (November 30, 2008). "Apple adds DMCA charge to lawsuit against Psystar: It accuses clone maker of breaking Mac OS copy-protection scheme". computerworld.com. http://www.computerworld.com/s/article/9121798/Apple_adds_DMCA_charge_to_lawsuit_against_Psystar. Retrieved 2009-10-07. 
8. ^ Elmer-DeWitt, Philip (2009-11-14). "Apple wins clone suit". CNN Money. http://brainstormtech.blogs.fortune.cnn.com/2009/11/14/apple-wins-clone-suit/. Retrieved November 15, 2009. 
9. ^ "The Netbook Hackintosh Video Apple Made Wired Take Down". I.gizmodo.com. 2009-01-14. http://i.gizmodo.com/5131264/the-netbook-hackintosh-video-apple-is-suing-wired-for. Retrieved 2009-04-28. 
10. ^ "Gadget Lab Video: Running OS X on a Netbook". Blog.wired.com. 2008-12-01. http://blog.wired.com/gadgets/2008/12/gadget-lab-vide.html. Retrieved 2009-04-28. 
11. ^ Apple Computer, Inc. (2005-06-06). "Apple to Use Intel Microprocessors Beginning in 2006". Apple.com. http://www.apple.com/pr/library/2005/jun/06intel.html. Retrieved 2009-04-28. 
12. ^ sHARD>> (October 16, 2005). "Apple Seeds 10.4.3 Intel to Developers". OSx86 Money Project. Archived from the original on 2006-04-12. http://web.archive.org/web/20060412082244/http://www.osx86project.org/index.php?option=com_content&task=view&id=53&Itemid=2. Retrieved 2006-05-28. 
13. ^ Jonathan Black (October 30, 2005). "Hacked OSx86 Updated to 10.4.3". OSx86 $$$ Project. Archived from the original on 2006-09-06. http://web.archive.org/web/20060906225712/http://www.osx86project.org/index.php?option=com_content&task=view&id=56. Retrieved 2006-05-28. 
14. ^ Jonathan Black (February 14, 2006). "OSx86 10.4.4 Security Broken. (Guess Who Done It?)". OSx86 Project. Archived from the original on 2007-10-17. http://web.archive.org/web/20071017043518/http://osx86project.org/index.php?option=com_content&task=view&id=116. Retrieved 2006-05-28. 
15. ^ Apple Computer (February 14, 2006). "Mac OS X Update 10.4.5". Apple Computer. http://www.apple.com/support/downloads/macosxupdate1045.html. Retrieved 2006-05-28. 
16. ^ sHARD>> (February 23, 2006). "Apple Releases 10.4.5". OSx86 Project. Archived from the original on 2007-10-17. http://web.archive.org/web/20071017043522/http://osx86project.org/index.php?option=com_content&task=view&id=128. Retrieved 2006-05-28. 
17. ^ Apple Computer (April 3, 2006). "Mac OS X 10.4.6 for Intel". Apple Computer. http://www.apple.com/support/downloads/macosx1046forintel.html. Retrieved 2006-05-28. 
18. ^ "Darwin/x86 Boot Loader". Tgwbd.org. http://www.tgwbd.org/darwin/boot.html. Retrieved 2009-04-28. 
19. ^ netkas.org :: W00t - released
20. ^ "Darwin/x86 Boot Loader". Tgwbd.org. http://tgwbd.org/darwin/boot.html. Retrieved 2009-04-28. 
21. ^ "HowTo: Install EFI patch and Use Unmodified OS X Kernel in Hackintosh". Digitmemo.com. http://www.digitmemo.com/articles/734/howto-install-efi-patch-and-enable-vanilla-os-x-kernel-in-hackintosh/. Retrieved 2009-04-28. 
22. ^ "Exclusive Report: EFI-X Mac Booter, A Scam?". 2009-09-08. http://www.tomshardware.com/news/asem-efix-mac-chameleon,8617.html. Retrieved 2009-09-08. 
23. ^ netkas.org » Enjoy
24. ^ "Boot-132". http://wiki.osx86project.org/wiki/index.php/Boot-132. Retrieved 2010-09-02. 
25. ^ "New modified BOOT-132 allows you to boot retail DVDs". 2008-06-30. http://www.insanelymac.com/forum/index.php?showtopic=113288. Retrieved 2009-05-12. 
26. ^ "Building a Hackintosh Apple Can't Sue You For". http://www.osnews.com/story/21564/Building_a_Hackintosh_Apple_Can_t_Sue_You_For. Retrieved 2010-09-02. 
27. ^ "xnu-dev". http://code.google.com/p/xnu-dev/. Retrieved 2009-05-12. 
28. ^ "http://sourceforge.net/apps/mediawiki/tianocore/index.php?title=Getting_Started". http://sourceforge.net/apps/mediawiki/tianocore/index.php?title=Getting_Started. Retrieved April 17, 2011. 
29. ^ "http://osx86.co/f36/new-duet-based-efi-bootloader-t6383/". http://osx86.co/f36/new-duet-based-efi-bootloader-t6383/. Retrieved April 17, 2011. 
30. ^ "http://www.projectosx.com/forum/index.php?showtopic=96&st=20". http://www.projectosx.com/forum/index.php?showtopic=96&st=20. Retrieved April 17, 2011. 
31. ^ "http://tgwbd.org/darwin/boot.html". http://tgwbd.org/darwin/boot.html. Retrieved April 17, 2011. 
32. ^ "http://www.hackint0sh.org/f181/79787.htm". http://www.hackint0sh.org/f181/79787.htm. Retrieved April 17, 2011. 
33. ^ "2009 Live DVD, how to make a simple, working osx livedvd". Insanelymac.com. http://www.insanelymac.com/forum/index.php?showtopic=144128&st=0h. Retrieved 2009-04-28. 
34. ^ "How to Run Mac OS X in VirtualBox on Windows". http://lifehacker.com/5583650/run-mac-os-x-in-virtualbox-on-windows. 
35. ^ "How to Install Mac OS X Snow Leopard in VirtualBox on Windows 7". http://www.redmondpie.com/how-to-install-mac-os-x-snow-leopard-in-virtualbox-on-windows-7/. 
36. ^ "Important notice regarding Mac OS X as Guest". http://forums.virtualbox.org/viewtopic.php?f=22&t=31104.