Messages in this thread | | | Date | Fri, 27 Dec 2002 18:04:26 -0800 | From | "H. Peter Anvin" <> | Subject | Re: Intel P6 vs P7 system call performance |
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Ingo Molnar wrote: > On Tue, 24 Dec 2002, Linus Torvalds wrote: > > >>I realized that there is really no reason to use __KERNEL_DS for this, >>and that as far as the kernel is concerned, the only thing that matters >>is that it's a flat 32-bit segment. So we might as well make the kernel >>always load ES/DS with __USER_DS instead, which has the advantage that >>we can avoid one set of segment loads for the "sysenter/sysexit" case. > > > this basically hardcodes flat segment layout on x86. If anything (Wine?) > modifies the default segments, it can wrap syscalls by saving/restoring > the modified %ds and %es selectors explicitly. >
I don't think you can modify the GDT segments.
-hpa
P.S. Please don't use my @transmeta.com address for non-Transmeta business. I'm trying very hard to keep my mailboxes semi-organized.
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