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[IA64] Save register stack contents on cpu start

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The SN PROM uses the register stack in the slave loop. The contents
must be preserved for the OS to return to the slave loop via offlining
a cpu or for kexec. A 'flushrs" is needed to force the stack to be written
to memory prior to changing bspstore.

Signed-off-by: Jack Steiner <steiner@sgi.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
This commit is contained in:
Jack Steiner 2006-08-31 11:34:47 -05:00 committed by Tony Luck
parent 2636255488
commit 1c7d67073e
1 changed files with 5 additions and 0 deletions
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5
arch/ia64/kernel/head.S
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@ -197,6 +197,11 @@ start_ap:
;;
srlz.i
;;
{
flushrs // must be first insn in group
srlz.i
}
;;
/*
* Save the region registers, predicate before they get clobbered
*/