x86_64: further cleanup of 32-bit compat syscall mechanisms

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AMD only supports "syscall" from 32-bit compat usermode.
Intel and Centaur(?) only support "sysenter" from 32-bit compat usermode.

Set the X86 feature bits accordingly, and set up the vdso in
accordance with those bits.  On the offchance we run on in a 64-bit
environment which supports neither syscall nor sysenter from 32-bit
mode, then fall back to the int $0x80 vdso.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>

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Jeremy Fitzhardinge 2008-07-12 02:22:00 -07:00 • committed by Ingo Molnar

parent 71415c6a08

commit 6a52e4b1cd

7 changed files with 35 additions and 22 deletions

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include/asm-x86/vdso.h

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