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To be fair, the Hackintosh community is pretty persistent. They added opcode emulation into the kernel, for example, to handle running on CPUs without the expec

To be fair, the Hackintosh community is pretty persistent. They added opcode emulation into the kernel, for example, to handle running on CPUs without the expected instructions (older AMD CPUs back in 10.8 or so). I wouldn't be surprised to see the cat-and-mouse continue.

close04 7y ago
Wonder what happens when Apple starts "enforcing" a Tx chip to boot. https://en.wikipedia.org/wiki/Apple-designed_processors#Apple_T1 https://en.wikipedia.org/wiki/Apple-designed_processors#Appl...
saagarjha 7y ago
This sounds really interesting, do you have any links that I could follow to learn more? Is it setting an invalid opcode exception handler?
- reanimus 7y ago
  They released a whitepaper on it, yeah. It was a bit annoying to dig up, but Archive.org comes to the rescue: https://web.archive.org/web/20100217014904/http://xnu-dev.googlecode.com/files/SSE3%20Emulator.pdf https://web.archive.org/web/20100217014904/http://xnu-dev.go...
  - saagarjha 7y ago
    It's strange that I can't find any source code for this…
    - reanimus 7y ago
      https://github.com/sinetek/xnu-amd/tree/master/osfmk/OPEMU https://github.com/sinetek/xnu-amd/tree/master/osfmk/OPEMU
      - saagarjha 7y ago
        Thanks! I still wonder how usable programs that utilize SSE3 with this, but it's a pretty cool workaround.
JoelTheSuperior 7y ago
Indeed though keep in mind that the current method for running macOS on AMD doesn't use this and instead relies on patching through Clover. The downside being that whilst the OS itself may run any applications that use an opcode that isn't implemented will simply crash.