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    From
    SubjectRe: SYSENTER based syscalls patch, 2.1.105, RFC
    Date
    Followup to:  <Pine.HPP.3.96.980617114407.27200V-100000@gra-ux1.iram.es>
    By author: Gabriel Paubert <paubert@iram.es>
    In newsgroup: linux.dev.kernel
    >
    > > Where was SYSENTER/SYSEXIT documented, by the way? Is it in
    > > Intel's PII operating system writer's guide?
    >
    > Not AFAIK, if you want to investigate, a good starting point is:
    >
    > <http://www.sandpile.org/80x86/appendix.shtml>
    >
    > (hint: follow the links to the AMD version called SYSCALL/SYSRET).
    >
    > Gabriel
    >

    There is a Celeron addendum to the Intel Architecture Software
    Development Manual -- Volume 2: Instruction Set Reference which
    documents these... you can find it as a PDF on Intel's web site. I'm
    afraid I don't have the document # handy.

    -hpa
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