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, 109 insertions, 0 deletions

diff --git a/kernel/arch/sh/mm/tlb-sh4.c b/kernel/arch/sh/mm/tlb-sh4.c
new file mode 100644
index 000000000..d42dd7e44
--- /dev/null
+++ b/kernel/arch/sh/mm/tlb-sh4.c
@@ -0,0 +1,109 @@
+/*
+ * arch/sh/mm/tlb-sh4.c
+ *
+ * SH-4 specific TLB operations
+ *
+ * Copyright (C) 1999  Niibe Yutaka
+ * Copyright (C) 2002 - 2007 Paul Mundt
+ *
+ * Released under the terms of the GNU GPL v2.0.
+ */
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/io.h>
+#include <asm/mmu_context.h>
+#include <asm/cacheflush.h>
+
+void __update_tlb(struct vm_area_struct *vma, unsigned long address, pte_t pte)
+{
+	unsigned long flags, pteval, vpn;
+
+	/*
+	 * Handle debugger faulting in for debugee.
+	 */
+	if (vma && current->active_mm != vma->vm_mm)
+		return;
+
+	local_irq_save(flags);
+
+	/* Set PTEH register */
+	vpn = (address & MMU_VPN_MASK) | get_asid();
+	__raw_writel(vpn, MMU_PTEH);
+
+	pteval = pte.pte_low;
+
+	/* Set PTEA register */
+#ifdef CONFIG_X2TLB
+	/*
+	 * For the extended mode TLB this is trivial, only the ESZ and
+	 * EPR bits need to be written out to PTEA, with the remainder of
+	 * the protection bits (with the exception of the compat-mode SZ
+	 * and PR bits, which are cleared) being written out in PTEL.
+	 */
+	__raw_writel(pte.pte_high, MMU_PTEA);
+#else
+	if (cpu_data->flags & CPU_HAS_PTEA) {
+		/* The last 3 bits and the first one of pteval contains
+		 * the PTEA timing control and space attribute bits
+		 */
+		__raw_writel(copy_ptea_attributes(pteval), MMU_PTEA);
+	}
+#endif
+
+	/* Set PTEL register */
+	pteval &= _PAGE_FLAGS_HARDWARE_MASK; /* drop software flags */
+#ifdef CONFIG_CACHE_WRITETHROUGH
+	pteval |= _PAGE_WT;
+#endif
+	/* conveniently, we want all the software flags to be 0 anyway */
+	__raw_writel(pteval, MMU_PTEL);
+
+	/* Load the TLB */
+	asm volatile("ldtlb": /* no output */ : /* no input */ : "memory");
+	local_irq_restore(flags);
+}
+
+void local_flush_tlb_one(unsigned long asid, unsigned long page)
+{
+	unsigned long addr, data;
+
+	/*
+	 * NOTE: PTEH.ASID should be set to this MM
+	 *       _AND_ we need to write ASID to the array.
+	 *
+	 * It would be simple if we didn't need to set PTEH.ASID...
+	 */
+	addr = MMU_UTLB_ADDRESS_ARRAY | MMU_PAGE_ASSOC_BIT;
+	data = page | asid; /* VALID bit is off */
+	jump_to_uncached();
+	__raw_writel(data, addr);
+	back_to_cached();
+}
+
+void local_flush_tlb_all(void)
+{
+	unsigned long flags, status;
+	int i;
+
+	/*
+	 * Flush all the TLB.
+	 */
+	local_irq_save(flags);
+	jump_to_uncached();
+
+	status = __raw_readl(MMUCR);
+	status = ((status & MMUCR_URB) >> MMUCR_URB_SHIFT);
+
+	if (status == 0)
+		status = MMUCR_URB_NENTRIES;
+
+	for (i = 0; i < status; i++)
+		__raw_writel(0x0, MMU_UTLB_ADDRESS_ARRAY | (i << 8));
+
+	for (i = 0; i < 4; i++)
+		__raw_writel(0x0, MMU_ITLB_ADDRESS_ARRAY | (i << 8));
+
+	back_to_cached();
+	ctrl_barrier();
+	local_irq_restore(flags);
+}