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, 184 insertions, 0 deletions

diff --git a/kernel/arch/frv/mm/tlb-flush.S b/kernel/arch/frv/mm/tlb-flush.S
new file mode 100644
index 000000000..79b3c7091
--- /dev/null
+++ b/kernel/arch/frv/mm/tlb-flush.S
@@ -0,0 +1,184 @@
+/* tlb-flush.S: TLB flushing routines
+ *
+ * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/sys.h>
+#include <linux/linkage.h>
+#include <asm/page.h>
+#include <asm/ptrace.h>
+#include <asm/spr-regs.h>
+
+.macro DEBUG ch
+#	sethi.p		%hi(0xfeff9c00),gr4
+#	setlo		%lo(0xfeff9c00),gr4
+#	setlos		#\ch,gr5
+#	stbi		gr5,@(gr4,#0)
+#	membar
+.endm
+
+	.section	.rodata
+
+	# sizes corresponding to TPXR.LMAX
+	.balign		1
+__tlb_lmax_sizes:
+	.byte		0, 64, 0, 0
+	.byte		0, 0, 0, 0
+	.byte		0, 0, 0, 0
+	.byte		0, 0, 0, 0
+
+	.section	.text
+	.balign		4
+
+###############################################################################
+#
+# flush everything
+# - void __flush_tlb_all(void)
+#
+###############################################################################
+	.globl		__flush_tlb_all
+	.type		__flush_tlb_all,@function
+__flush_tlb_all:
+	DEBUG		'A'
+
+	# kill cached PGE value
+	setlos		#0xffffffff,gr4
+	movgs		gr4,scr0
+	movgs		gr4,scr1
+
+	# kill AMPR-cached TLB values
+	movgs		gr0,iamlr1
+	movgs		gr0,iampr1
+	movgs		gr0,damlr1
+	movgs		gr0,dampr1
+
+	# find out how many lines there are
+	movsg		tpxr,gr5
+	sethi.p		%hi(__tlb_lmax_sizes),gr4
+	srli		gr5,#TPXR_LMAX_SHIFT,gr5
+	setlo.p		%lo(__tlb_lmax_sizes),gr4
+	andi		gr5,#TPXR_LMAX_SMASK,gr5
+	ldub		@(gr4,gr5),gr4
+
+	# now, we assume that the TLB line step is page size in size
+	setlos.p	#PAGE_SIZE,gr5
+	setlos		#0,gr6
+1:
+	tlbpr		gr6,gr0,#6,#0
+	subicc.p	gr4,#1,gr4,icc0
+	add		gr6,gr5,gr6
+	bne		icc0,#2,1b
+
+	DEBUG		'B'
+	bralr
+
+	.size		__flush_tlb_all, .-__flush_tlb_all
+
+###############################################################################
+#
+# flush everything to do with one context
+# - void __flush_tlb_mm(unsigned long contextid [GR8])
+#
+###############################################################################
+	.globl		__flush_tlb_mm
+	.type		__flush_tlb_mm,@function
+__flush_tlb_mm:
+	DEBUG		'M'
+
+	# kill cached PGE value
+	setlos		#0xffffffff,gr4
+	movgs		gr4,scr0
+	movgs		gr4,scr1
+
+	# specify the context we want to flush
+	movgs		gr8,tplr
+
+	# find out how many lines there are
+	movsg		tpxr,gr5
+	sethi.p		%hi(__tlb_lmax_sizes),gr4
+	srli		gr5,#TPXR_LMAX_SHIFT,gr5
+	setlo.p		%lo(__tlb_lmax_sizes),gr4
+	andi		gr5,#TPXR_LMAX_SMASK,gr5
+	ldub		@(gr4,gr5),gr4
+
+	# now, we assume that the TLB line step is page size in size
+	setlos.p	#PAGE_SIZE,gr5
+	setlos		#0,gr6
+0:
+	tlbpr		gr6,gr0,#5,#0
+	subicc.p	gr4,#1,gr4,icc0
+	add		gr6,gr5,gr6
+	bne		icc0,#2,0b
+
+	DEBUG		'N'
+	bralr
+
+	.size		__flush_tlb_mm, .-__flush_tlb_mm
+
+###############################################################################
+#
+# flush a range of addresses from the TLB
+# - void __flush_tlb_page(unsigned long contextid [GR8],
+#			  unsigned long start [GR9])
+#
+###############################################################################
+	.globl		__flush_tlb_page
+	.type		__flush_tlb_page,@function
+__flush_tlb_page:
+	# kill cached PGE value
+	setlos		#0xffffffff,gr4
+	movgs		gr4,scr0
+	movgs		gr4,scr1
+
+	# specify the context we want to flush
+	movgs		gr8,tplr
+
+	# zap the matching TLB line and AMR values
+	setlos		#~(PAGE_SIZE-1),gr5
+	and		gr9,gr5,gr9
+	tlbpr		gr9,gr0,#5,#0
+
+	bralr
+
+	.size		__flush_tlb_page, .-__flush_tlb_page
+
+###############################################################################
+#
+# flush a range of addresses from the TLB
+# - void __flush_tlb_range(unsigned long contextid [GR8],
+#			   unsigned long start [GR9],
+#			   unsigned long end [GR10])
+#
+###############################################################################
+	.globl		__flush_tlb_range
+	.type		__flush_tlb_range,@function
+__flush_tlb_range:
+	# kill cached PGE value
+	setlos		#0xffffffff,gr4
+	movgs		gr4,scr0
+	movgs		gr4,scr1
+
+	# specify the context we want to flush
+	movgs		gr8,tplr
+
+	# round the start down to beginning of TLB line and end up to beginning of next TLB line
+	setlos.p	#~(PAGE_SIZE-1),gr5
+	setlos		#PAGE_SIZE,gr6
+	subi.p		gr10,#1,gr10
+	and		gr9,gr5,gr9
+	and		gr10,gr5,gr10
+2:
+	tlbpr		gr9,gr0,#5,#0
+	subcc.p		gr9,gr10,gr0,icc0
+	add		gr9,gr6,gr9
+	bne		icc0,#0,2b		; most likely a 1-page flush
+
+	bralr
+
+	.size		__flush_tlb_range, .-__flush_tlb_range