Add SMP support for Zedboard.

Submitted by:	Thomas Skibo <ThomasSkibo@sbcglobal.net>

sys/arm/conf/ZEDBOARD

@@ -56,6 +56,7 @@ options 	SYSVSEM			# SYSV-style semaphores
 options 	_KPOSIX_PRIORITY_SCHEDULING # Posix P1003_1B real-time extensions
 options 	FREEBSD_BOOT_LOADER
 options 	VFP			# vfp/neon
+options 	SMP			# Symmetric MultiProcessor Kernel
 
 # Debugging
 makeoptions	DEBUG=-g

sys/arm/xilinx/files.zynq7

@@ -21,6 +21,7 @@ arm/xilinx/zy7_l2cache.c			standard
 arm/xilinx/zy7_bus_space.c			standard
 arm/xilinx/zy7_slcr.c				standard
 arm/xilinx/zy7_devcfg.c				standard
+arm/xilinx/zy7_mp.c				optional smp
 
 dev/cadence/if_cgem.c				optional if_cgem
 dev/sdhci/sdhci_fdt.c				optional sdhci

sys/arm/xilinx/std.zynq7

@@ -20,3 +20,5 @@ makeoptions	KERNVIRTADDR=0xc0100000
 
 options		ARM_L2_PIPT
 
+options		IPI_IRQ_START=0
+options		IPI_IRQ_END=15

sys/arm/xilinx/zy7_mp.c

@@ -0,0 +1,99 @@
+/*-
+ * Copyright (c) 2013 Thomas Skibo.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/bus.h>
+#include <sys/lock.h>
+#include <sys/mutex.h>
+#include <sys/smp.h>
+
+#include <machine/smp.h>
+#include <machine/fdt.h>
+#include <machine/intr.h>
+
+#include <arm/xilinx/zy7_reg.h>
+
+#define	ZYNQ7_CPU1_ENTRY	0xfffffff0
+
+void
+platform_mp_init_secondary(void)
+{
+
+	gic_init_secondary();
+}
+
+void
+platform_mp_setmaxid(void)
+{
+
+	mp_maxid = 1;
+}
+
+int
+platform_mp_probe(void)
+{
+
+	mp_ncpus = 2;
+	return (1);
+}
+
+void    
+platform_mp_start_ap(void)
+{
+	bus_space_handle_t ocm_handle;
+
+	/* Map in magic location to give entry address to CPU1. */
+	if (bus_space_map(fdtbus_bs_tag, ZYNQ7_CPU1_ENTRY, 4,
+	    0, &ocm_handle) != 0)
+		panic("platform_mp_start_ap: Couldn't map OCM\n");
+
+	/* Write start address for CPU1. */
+	bus_space_write_4(fdtbus_bs_tag, ocm_handle, 0,
+	    pmap_kextract((vm_offset_t)mpentry));
+
+	/*
+	 * The SCU is enabled by the BOOTROM but I think the second CPU doesn't
+	 * turn on filtering until after the wake-up below. I think that's why
+	 * things don't work if I don't put these cache ops here.  Also, the
+	 * magic location, 0xfffffff0, isn't in the SCU's filtering range so it
+	 * needs a write-back too.
+	 */
+	cpu_idcache_wbinv_all();
+	cpu_l2cache_wbinv_all();
+
+	/* Wake up CPU1. */
+	armv7_sev();
+
+	bus_space_unmap(fdtbus_bs_tag, ocm_handle, 4);
+}
+
+void
+platform_ipi_send(cpuset_t cpus, u_int ipi)
+{
+
+	pic_ipi_send(cpus, ipi);
+}