From: Jeremy Fitzhardinge <jeremy@goop.org>
Date: Sat, 12 Jul 2008 09:22:00 +0000 (-0700)
Subject: x86_64: further cleanup of 32-bit compat syscall mechanisms
X-Git-Tag: v2.6.27-rc1~955^2~1^20~6
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6a52e4b1cddd90fbfde8fb67021657936ee74b07;p=pandora-kernel.git

x86_64: further cleanup of 32-bit compat syscall mechanisms

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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