Add the rt linux 4.1.3-rt3 as base

Import the rt linux 4.1.3-rt3 as OPNFV kvm base.

It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and
the base is:

commit 0917f823c59692d751951bf5ea699a2d1e2f26a2
Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date:   Sat Jul 25 12:13:34 2015 +0200

    Prepare v4.1.3-rt3

    Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>

We lose all the git history this way and it's not good. We
should apply another opnfv project repo in future.

Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423
Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>

1 files changed, 59 insertions, 0 deletions

diff --git a/kernel/arch/arm/mm/l2c-l2x0-resume.S b/kernel/arch/arm/mm/l2c-l2x0-resume.S
new file mode 100644
index 000000000..fda415e4c
--- /dev/null
+++ b/kernel/arch/arm/mm/l2c-l2x0-resume.S
@@ -0,0 +1,59 @@
+/*
+ * L2C-310 early resume code.  This can be used by platforms to restore
+ * the settings of their L2 cache controller before restoring the
+ * processor state.
+ *
+ * This code can only be used to if you are running in the secure world.
+ */
+#include <linux/linkage.h>
+#include <asm/assembler.h>
+#include <asm/hardware/cache-l2x0.h>
+
+	.text
+
+ENTRY(l2c310_early_resume)
+	adr	r0, 1f
+	ldr	r2, [r0]
+	add	r0, r2, r0
+
+	ldmia	r0, {r1, r2, r3, r4, r5, r6, r7, r8}
+	@ r1 = phys address of L2C-310 controller
+	@ r2 = aux_ctrl
+	@ r3 = tag_latency
+	@ r4 = data_latency
+	@ r5 = filter_start
+	@ r6 = filter_end
+	@ r7 = prefetch_ctrl
+	@ r8 = pwr_ctrl
+
+	@ Check that the address has been initialised
+	teq	r1, #0
+	reteq	lr
+
+	@ The prefetch and power control registers are revision dependent
+	@ and can be written whether or not the L2 cache is enabled
+	ldr	r0, [r1, #L2X0_CACHE_ID]
+	and	r0, r0, #L2X0_CACHE_ID_RTL_MASK
+	cmp	r0, #L310_CACHE_ID_RTL_R2P0
+	strcs	r7, [r1, #L310_PREFETCH_CTRL]
+	cmp	r0, #L310_CACHE_ID_RTL_R3P0
+	strcs	r8, [r1, #L310_POWER_CTRL]
+
+	@ Don't setup the L2 cache if it is already enabled
+	ldr	r0, [r1, #L2X0_CTRL]
+	tst	r0, #L2X0_CTRL_EN
+	retne	lr
+
+	str	r3, [r1, #L310_TAG_LATENCY_CTRL]
+	str	r4, [r1, #L310_DATA_LATENCY_CTRL]
+	str	r6, [r1, #L310_ADDR_FILTER_END]
+	str	r5, [r1, #L310_ADDR_FILTER_START]
+
+	str	r2, [r1, #L2X0_AUX_CTRL]
+	mov	r9, #L2X0_CTRL_EN
+	str	r9, [r1, #L2X0_CTRL]
+	ret	lr
+ENDPROC(l2c310_early_resume)
+
+	.align
+1:	.long	l2x0_saved_regs - .