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, 273 insertions, 0 deletions

diff --git a/kernel/arch/arm/mm/proc-sa1100.S b/kernel/arch/arm/mm/proc-sa1100.S
new file mode 100644
index 000000000..222d5836f
--- /dev/null
+++ b/kernel/arch/arm/mm/proc-sa1100.S
@@ -0,0 +1,273 @@
+/*
+ *  linux/arch/arm/mm/proc-sa1100.S
+ *
+ *  Copyright (C) 1997-2002 Russell King
+ *  hacked for non-paged-MM by Hyok S. Choi, 2003.
+ *
+ * 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.
+ *
+ *  MMU functions for SA110
+ *
+ *  These are the low level assembler for performing cache and TLB
+ *  functions on the StrongARM-1100 and StrongARM-1110.
+ *
+ *  Note that SA1100 and SA1110 share everything but their name and CPU ID.
+ *
+ *  12-jun-2000, Erik Mouw (J.A.K.Mouw@its.tudelft.nl):
+ *    Flush the read buffer at context switches
+ */
+#include <linux/linkage.h>
+#include <linux/init.h>
+#include <asm/assembler.h>
+#include <asm/asm-offsets.h>
+#include <asm/hwcap.h>
+#include <mach/hardware.h>
+#include <asm/pgtable-hwdef.h>
+#include <asm/pgtable.h>
+
+#include "proc-macros.S"
+
+/*
+ * the cache line size of the I and D cache
+ */
+#define DCACHELINESIZE	32
+
+	.section .text
+
+/*
+ * cpu_sa1100_proc_init()
+ */
+ENTRY(cpu_sa1100_proc_init)
+	mov	r0, #0
+	mcr	p15, 0, r0, c15, c1, 2		@ Enable clock switching
+	mcr	p15, 0, r0, c9, c0, 5		@ Allow read-buffer operations from userland
+	ret	lr
+
+/*
+ * cpu_sa1100_proc_fin()
+ *
+ * Prepare the CPU for reset:
+ *  - Disable interrupts
+ *  - Clean and turn off caches.
+ */
+ENTRY(cpu_sa1100_proc_fin)
+	mcr	p15, 0, ip, c15, c2, 2		@ Disable clock switching
+	mrc	p15, 0, r0, c1, c0, 0		@ ctrl register
+	bic	r0, r0, #0x1000			@ ...i............
+	bic	r0, r0, #0x000e			@ ............wca.
+	mcr	p15, 0, r0, c1, c0, 0		@ disable caches
+	ret	lr
+
+/*
+ * cpu_sa1100_reset(loc)
+ *
+ * Perform a soft reset of the system.  Put the CPU into the
+ * same state as it would be if it had been reset, and branch
+ * to what would be the reset vector.
+ *
+ * loc: location to jump to for soft reset
+ */
+	.align	5
+	.pushsection	.idmap.text, "ax"
+ENTRY(cpu_sa1100_reset)
+	mov	ip, #0
+	mcr	p15, 0, ip, c7, c7, 0		@ invalidate I,D caches
+	mcr	p15, 0, ip, c7, c10, 4		@ drain WB
+#ifdef CONFIG_MMU
+	mcr	p15, 0, ip, c8, c7, 0		@ invalidate I & D TLBs
+#endif
+	mrc	p15, 0, ip, c1, c0, 0		@ ctrl register
+	bic	ip, ip, #0x000f			@ ............wcam
+	bic	ip, ip, #0x1100			@ ...i...s........
+	mcr	p15, 0, ip, c1, c0, 0		@ ctrl register
+	ret	r0
+ENDPROC(cpu_sa1100_reset)
+	.popsection
+
+/*
+ * cpu_sa1100_do_idle(type)
+ *
+ * Cause the processor to idle
+ *
+ * type: call type:
+ *   0 = slow idle
+ *   1 = fast idle
+ *   2 = switch to slow processor clock
+ *   3 = switch to fast processor clock
+ */
+	.align	5
+ENTRY(cpu_sa1100_do_idle)
+	mov	r0, r0				@ 4 nop padding
+	mov	r0, r0
+	mov	r0, r0
+	mov	r0, r0				@ 4 nop padding
+	mov	r0, r0
+	mov	r0, r0
+	mov	r0, #0
+	ldr	r1, =UNCACHEABLE_ADDR		@ ptr to uncacheable address
+	@ --- aligned to a cache line
+	mcr	p15, 0, r0, c15, c2, 2		@ disable clock switching
+	ldr	r1, [r1, #0]			@ force switch to MCLK
+	mcr	p15, 0, r0, c15, c8, 2		@ wait for interrupt
+	mov	r0, r0				@ safety
+	mcr	p15, 0, r0, c15, c1, 2		@ enable clock switching
+	ret	lr
+
+/* ================================= CACHE ================================ */
+
+/*
+ * cpu_sa1100_dcache_clean_area(addr,sz)
+ *
+ * Clean the specified entry of any caches such that the MMU
+ * translation fetches will obtain correct data.
+ *
+ * addr: cache-unaligned virtual address
+ */
+	.align	5
+ENTRY(cpu_sa1100_dcache_clean_area)
+1:	mcr	p15, 0, r0, c7, c10, 1		@ clean D entry
+	add	r0, r0, #DCACHELINESIZE
+	subs	r1, r1, #DCACHELINESIZE
+	bhi	1b
+	ret	lr
+
+/* =============================== PageTable ============================== */
+
+/*
+ * cpu_sa1100_switch_mm(pgd)
+ *
+ * Set the translation base pointer to be as described by pgd.
+ *
+ * pgd: new page tables
+ */
+	.align	5
+ENTRY(cpu_sa1100_switch_mm)
+#ifdef CONFIG_MMU
+	str	lr, [sp, #-4]!
+	bl	v4wb_flush_kern_cache_all	@ clears IP
+	mcr	p15, 0, ip, c9, c0, 0		@ invalidate RB
+	mcr	p15, 0, r0, c2, c0, 0		@ load page table pointer
+	mcr	p15, 0, ip, c8, c7, 0		@ invalidate I & D TLBs
+	ldr	pc, [sp], #4
+#else
+	ret	lr
+#endif
+
+/*
+ * cpu_sa1100_set_pte_ext(ptep, pte, ext)
+ *
+ * Set a PTE and flush it out
+ */
+	.align	5
+ENTRY(cpu_sa1100_set_pte_ext)
+#ifdef CONFIG_MMU
+	armv3_set_pte_ext wc_disable=0
+	mov	r0, r0
+	mcr	p15, 0, r0, c7, c10, 1		@ clean D entry
+	mcr	p15, 0, r0, c7, c10, 4		@ drain WB
+#endif
+	ret	lr
+
+.globl	cpu_sa1100_suspend_size
+.equ	cpu_sa1100_suspend_size, 4 * 3
+#ifdef CONFIG_ARM_CPU_SUSPEND
+ENTRY(cpu_sa1100_do_suspend)
+	stmfd	sp!, {r4 - r6, lr}
+	mrc	p15, 0, r4, c3, c0, 0		@ domain ID
+	mrc	p15, 0, r5, c13, c0, 0		@ PID
+	mrc	p15, 0, r6, c1, c0, 0		@ control reg
+	stmia	r0, {r4 - r6}			@ store cp regs
+	ldmfd	sp!, {r4 - r6, pc}
+ENDPROC(cpu_sa1100_do_suspend)
+
+ENTRY(cpu_sa1100_do_resume)
+	ldmia	r0, {r4 - r6}			@ load cp regs
+	mov	ip, #0
+	mcr	p15, 0, ip, c8, c7, 0		@ flush I+D TLBs
+	mcr	p15, 0, ip, c7, c7, 0		@ flush I&D cache
+	mcr	p15, 0, ip, c9, c0, 0		@ invalidate RB
+	mcr	p15, 0, ip, c9, c0, 5		@ allow user space to use RB
+
+	mcr	p15, 0, r4, c3, c0, 0		@ domain ID
+	mcr	p15, 0, r1, c2, c0, 0		@ translation table base addr
+	mcr	p15, 0, r5, c13, c0, 0		@ PID
+	mov	r0, r6				@ control register
+	b	cpu_resume_mmu
+ENDPROC(cpu_sa1100_do_resume)
+#endif
+
+	.type	__sa1100_setup, #function
+__sa1100_setup:
+	mov	r0, #0
+	mcr	p15, 0, r0, c7, c7		@ invalidate I,D caches on v4
+	mcr	p15, 0, r0, c7, c10, 4		@ drain write buffer on v4
+#ifdef CONFIG_MMU
+	mcr	p15, 0, r0, c8, c7		@ invalidate I,D TLBs on v4
+#endif
+	adr	r5, sa1100_crval
+	ldmia	r5, {r5, r6}
+	mrc	p15, 0, r0, c1, c0		@ get control register v4
+	bic	r0, r0, r5
+	orr	r0, r0, r6
+	ret	lr
+	.size	__sa1100_setup, . - __sa1100_setup
+
+	/*
+	 *  R
+	 * .RVI ZFRS BLDP WCAM
+	 * ..11 0001 ..11 1101
+	 * 
+	 */
+	.type	sa1100_crval, #object
+sa1100_crval:
+	crval	clear=0x00003f3f, mmuset=0x0000313d, ucset=0x00001130
+
+	__INITDATA
+
+/*
+ * SA1100 and SA1110 share the same function calls
+ */
+
+	@ define struct processor (see <asm/proc-fns.h> and proc-macros.S)
+	define_processor_functions sa1100, dabort=v4_early_abort, pabort=legacy_pabort, suspend=1
+
+	.section ".rodata"
+
+	string	cpu_arch_name, "armv4"
+	string	cpu_elf_name, "v4"
+	string	cpu_sa1100_name, "StrongARM-1100"
+	string	cpu_sa1110_name, "StrongARM-1110"
+
+	.align
+
+	.section ".proc.info.init", #alloc
+
+.macro sa1100_proc_info name:req, cpu_val:req, cpu_mask:req, cpu_name:req
+	.type	__\name\()_proc_info,#object
+__\name\()_proc_info:
+	.long	\cpu_val
+	.long	\cpu_mask
+	.long   PMD_TYPE_SECT | \
+		PMD_SECT_BUFFERABLE | \
+		PMD_SECT_CACHEABLE | \
+		PMD_SECT_AP_WRITE | \
+		PMD_SECT_AP_READ
+	.long   PMD_TYPE_SECT | \
+		PMD_SECT_AP_WRITE | \
+		PMD_SECT_AP_READ
+	initfn	__sa1100_setup, __\name\()_proc_info
+	.long	cpu_arch_name
+	.long	cpu_elf_name
+	.long	HWCAP_SWP | HWCAP_HALF | HWCAP_26BIT | HWCAP_FAST_MULT
+	.long	\cpu_name
+	.long	sa1100_processor_functions
+	.long	v4wb_tlb_fns
+	.long	v4_mc_user_fns
+	.long	v4wb_cache_fns
+	.size	__\name\()_proc_info, . - __\name\()_proc_info
+.endm
+
+	sa1100_proc_info sa1100, 0x4401a110, 0xfffffff0, cpu_sa1100_name
+	sa1100_proc_info sa1110, 0x6901b110, 0xfffffff0, cpu_sa1110_name