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SWAPGS Swap GS Base Register
SYSCALL Fast System Call P6?
afaik, SYSCALL is an AMD technology and availability is detected through "STAR" MSRs. Should be checked, though.
I don't see any reference to "swapgs" in the books i own about x86 architecture ... that one is x86_64 specific right ? or maybe i'm wrongly assuming that the "complete list" provides a view of "from when any instruction has been introduced" ...
Availability is detected through CPUID or through the EFER MSR. The *STAR MSR's configure it (the STAR for realmode and the other two for lmode, one for 64-bit and one for 32-bit mode).
afaik, SYSCALL is an AMD technology and availability is detected through "STAR" MSRs. Should be checked, though.SWAPGS Swap GS Base Register