From: Eduardo Habkost <ehabkost@redhat.com>
Date: Wed, 25 Jun 2008 04:19:16 +0000 (-0400)
Subject: paravirt/x86, 64-bit: move __PAGE_OFFSET to leave a space for hypervisor
X-Git-Tag: v2.6.27-rc1~1106^2~136
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a6523748bddd38bcec11431f57502090b6014a96;p=pandora-kernel.git

paravirt/x86, 64-bit: move __PAGE_OFFSET to leave a space for hypervisor

Set __PAGE_OFFSET to the most negative possible address +
16*PGDIR_SIZE.  The gap is to allow a space for a hypervisor to fit.
The gap is more or less arbitrary, but it's what Xen needs.

When booting native, kernel/head_64.S has a set of compile-time
generated pagetables used at boot time.  This patch removes their
absolutely hard-coded layout, and makes it parameterised on
__PAGE_OFFSET (and __START_KERNEL_map).

Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Cc: xen-devel <xen-devel@lists.xensource.com>
Cc: Stephen Tweedie <sct@redhat.com>
Cc: Eduardo Habkost <ehabkost@redhat.com>
Cc: Mark McLoughlin <markmc@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---

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