arm: zynq: Add smp support

Zynq is dual core Cortex A9 which starts always
at zero. Using simple trampoline ensure long jump
to secondary_startup code.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: Steffen Trumtrar <s.trumtrar@pengutronix.de>

arch/arm/mach-zynq/headsmp.S

@@ -0,0 +1,24 @@
+/*
+ * Copyright (c) 2013 Steffen Trumtrar <s.trumtrar@pengutronix.de>
+ * Copyright (c) 2012-2013 Xilinx
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/linkage.h>
+#include <linux/init.h>
+
+	__CPUINIT
+
+ENTRY(zynq_secondary_trampoline)
+	ldr	r0, [pc]
+	bx	r0
+.globl zynq_secondary_trampoline_jump
+zynq_secondary_trampoline_jump:
+	/* Space for jumping address */
+	.word	/* cpu 1 */
+.globl zynq_secondary_trampoline_end
+zynq_secondary_trampoline_end:
+
+ENDPROC(zynq_secondary_trampoline)