From: Jeremy Fitzhardinge <jeremy@goop.org>
Date: Mon, 2 Feb 2009 21:55:42 +0000 (-0800)
Subject: xen: make direct versions of irq_enable/disable/save/restore to common code
X-Git-Tag: v2.6.30-rc1~2^2~50^2~46^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5393744b71ce797f1b1546fafaed127fc50c2b61;p=pandora-kernel.git

xen: make direct versions of irq_enable/disable/save/restore to common code

Now that x86-64 has directly accessible percpu variables, it can also
implement the direct versions of these operations, which operate on a
vcpu_info structure directly embedded in the percpu area.

In fact, the 64-bit versions are more or less identical, and so can be
shared.  The only two differences are:
 1. xen_restore_fl_direct takes its argument in eax on 32-bit, and rdi on 64-bit.
    Unfortunately it isn't possible to directly refer to the 2nd lsb of rdi directly
    (as you can with %ah), so the code isn't quite as dense.
 2. check_events needs to variants to save different registers.

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