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In 2007 [http://lkml.iu.edu/hypermail/linux/kernel/0709.2/2726.html x86: multi-byte single instruction NOPs] was committed to Linux. This added a set of 'P6 NOPs' that used the multi-byte NOP opcodes and used them for i686 or newer x86 CPUs. Which type of NOPs to use were decided at runtime, so running an i686 kernel on an i586 machine would not cause any issues with this. Strangely on 64-bit systems the NOPs were only used if your CPU vendor was Intel. Β | In 2007 [http://lkml.iu.edu/hypermail/linux/kernel/0709.2/2726.html x86: multi-byte single instruction NOPs] was committed to Linux. This added a set of 'P6 NOPs' that used the multi-byte NOP opcodes and used them for i686 or newer x86 CPUs. Which type of NOPs to use were decided at runtime, so running an i686 kernel on an i586 machine would not cause any issues with this. Strangely on 64-bit systems the NOPs were only used if your CPU vendor was Intel. Β | ||
In 2008 the Debian bugs [https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=463606 Linux 2.6.24 fails to boot on MS Virtual PC 2007] and [https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=464962 -686 build uses long noops, that are unsupported by Transmeta Crusoe, immediate crash on boot] were reported. After a lot of discussion, the following CPUs were reported to not support multi-byte NOPs: | In 2008 the Debian bugs [https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=463606 Linux 2.6.24 fails to boot on MS Virtual PC 2007] and [https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=464962 -686 build uses long noops, that are unsupported by Transmeta Crusoe, immediate crash on boot] were reported, as well as the Linux. After a lot of discussion, the following CPUs were reported to not support multi-byte NOPs: | ||
* VIA C3 Nehemiah | * VIA C3 Nehemiah |