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, 240 insertions, 0 deletions

diff --git a/kernel/arch/mips/mm/cache.c b/kernel/arch/mips/mm/cache.c
new file mode 100644
index 000000000..77d96db82
--- /dev/null
+++ b/kernel/arch/mips/mm/cache.c
@@ -0,0 +1,240 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 1994 - 2003, 06, 07 by Ralf Baechle (ralf@linux-mips.org)
+ * Copyright (C) 2007 MIPS Technologies, Inc.
+ */
+#include <linux/fs.h>
+#include <linux/fcntl.h>
+#include <linux/kernel.h>
+#include <linux/linkage.h>
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/syscalls.h>
+#include <linux/mm.h>
+
+#include <asm/cacheflush.h>
+#include <asm/processor.h>
+#include <asm/cpu.h>
+#include <asm/cpu-features.h>
+
+/* Cache operations. */
+void (*flush_cache_all)(void);
+void (*__flush_cache_all)(void);
+void (*flush_cache_mm)(struct mm_struct *mm);
+void (*flush_cache_range)(struct vm_area_struct *vma, unsigned long start,
+	unsigned long end);
+void (*flush_cache_page)(struct vm_area_struct *vma, unsigned long page,
+	unsigned long pfn);
+void (*flush_icache_range)(unsigned long start, unsigned long end);
+EXPORT_SYMBOL_GPL(flush_icache_range);
+void (*local_flush_icache_range)(unsigned long start, unsigned long end);
+EXPORT_SYMBOL_GPL(local_flush_icache_range);
+
+void (*__flush_cache_vmap)(void);
+void (*__flush_cache_vunmap)(void);
+
+void (*__flush_kernel_vmap_range)(unsigned long vaddr, int size);
+EXPORT_SYMBOL_GPL(__flush_kernel_vmap_range);
+void (*__invalidate_kernel_vmap_range)(unsigned long vaddr, int size);
+
+/* MIPS specific cache operations */
+void (*flush_cache_sigtramp)(unsigned long addr);
+void (*local_flush_data_cache_page)(void * addr);
+void (*flush_data_cache_page)(unsigned long addr);
+void (*flush_icache_all)(void);
+
+EXPORT_SYMBOL_GPL(local_flush_data_cache_page);
+EXPORT_SYMBOL(flush_data_cache_page);
+EXPORT_SYMBOL(flush_icache_all);
+
+#if defined(CONFIG_DMA_NONCOHERENT) || defined(CONFIG_DMA_MAYBE_COHERENT)
+
+/* DMA cache operations. */
+void (*_dma_cache_wback_inv)(unsigned long start, unsigned long size);
+void (*_dma_cache_wback)(unsigned long start, unsigned long size);
+void (*_dma_cache_inv)(unsigned long start, unsigned long size);
+
+EXPORT_SYMBOL(_dma_cache_wback_inv);
+
+#endif /* CONFIG_DMA_NONCOHERENT || CONFIG_DMA_MAYBE_COHERENT */
+
+/*
+ * We could optimize the case where the cache argument is not BCACHE but
+ * that seems very atypical use ...
+ */
+SYSCALL_DEFINE3(cacheflush, unsigned long, addr, unsigned long, bytes,
+	unsigned int, cache)
+{
+	if (bytes == 0)
+		return 0;
+	if (!access_ok(VERIFY_WRITE, (void __user *) addr, bytes))
+		return -EFAULT;
+
+	flush_icache_range(addr, addr + bytes);
+
+	return 0;
+}
+
+void __flush_dcache_page(struct page *page)
+{
+	struct address_space *mapping = page_mapping(page);
+	unsigned long addr;
+
+	if (PageHighMem(page))
+		return;
+	if (mapping && !mapping_mapped(mapping)) {
+		SetPageDcacheDirty(page);
+		return;
+	}
+
+	/*
+	 * We could delay the flush for the !page_mapping case too.  But that
+	 * case is for exec env/arg pages and those are %99 certainly going to
+	 * get faulted into the tlb (and thus flushed) anyways.
+	 */
+	addr = (unsigned long) page_address(page);
+	flush_data_cache_page(addr);
+}
+
+EXPORT_SYMBOL(__flush_dcache_page);
+
+void __flush_anon_page(struct page *page, unsigned long vmaddr)
+{
+	unsigned long addr = (unsigned long) page_address(page);
+
+	if (pages_do_alias(addr, vmaddr)) {
+		if (page_mapped(page) && !Page_dcache_dirty(page)) {
+			void *kaddr;
+
+			kaddr = kmap_coherent(page, vmaddr);
+			flush_data_cache_page((unsigned long)kaddr);
+			kunmap_coherent();
+		} else
+			flush_data_cache_page(addr);
+	}
+}
+
+EXPORT_SYMBOL(__flush_anon_page);
+
+void __flush_icache_page(struct vm_area_struct *vma, struct page *page)
+{
+	unsigned long addr;
+
+	if (PageHighMem(page))
+		return;
+
+	addr = (unsigned long) page_address(page);
+	flush_data_cache_page(addr);
+}
+EXPORT_SYMBOL_GPL(__flush_icache_page);
+
+void __update_cache(struct vm_area_struct *vma, unsigned long address,
+	pte_t pte)
+{
+	struct page *page;
+	unsigned long pfn, addr;
+	int exec = (vma->vm_flags & VM_EXEC) && !cpu_has_ic_fills_f_dc;
+
+	pfn = pte_pfn(pte);
+	if (unlikely(!pfn_valid(pfn)))
+		return;
+	page = pfn_to_page(pfn);
+	if (page_mapping(page) && Page_dcache_dirty(page)) {
+		addr = (unsigned long) page_address(page);
+		if (exec || pages_do_alias(addr, address & PAGE_MASK))
+			flush_data_cache_page(addr);
+		ClearPageDcacheDirty(page);
+	}
+}
+
+unsigned long _page_cachable_default;
+EXPORT_SYMBOL(_page_cachable_default);
+
+static inline void setup_protection_map(void)
+{
+	if (cpu_has_rixi) {
+		protection_map[0]  = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_NO_READ);
+		protection_map[1]  = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC);
+		protection_map[2]  = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_NO_READ);
+		protection_map[3]  = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC);
+		protection_map[4]  = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_READ);
+		protection_map[5]  = __pgprot(_page_cachable_default | _PAGE_PRESENT);
+		protection_map[6]  = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_READ);
+		protection_map[7]  = __pgprot(_page_cachable_default | _PAGE_PRESENT);
+
+		protection_map[8]  = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_NO_READ);
+		protection_map[9]  = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC);
+		protection_map[10] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_WRITE | _PAGE_NO_READ);
+		protection_map[11] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_WRITE);
+		protection_map[12] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_READ);
+		protection_map[13] = __pgprot(_page_cachable_default | _PAGE_PRESENT);
+		protection_map[14] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_WRITE  | _PAGE_NO_READ);
+		protection_map[15] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_WRITE);
+
+	} else {
+		protection_map[0] = PAGE_NONE;
+		protection_map[1] = PAGE_READONLY;
+		protection_map[2] = PAGE_COPY;
+		protection_map[3] = PAGE_COPY;
+		protection_map[4] = PAGE_READONLY;
+		protection_map[5] = PAGE_READONLY;
+		protection_map[6] = PAGE_COPY;
+		protection_map[7] = PAGE_COPY;
+		protection_map[8] = PAGE_NONE;
+		protection_map[9] = PAGE_READONLY;
+		protection_map[10] = PAGE_SHARED;
+		protection_map[11] = PAGE_SHARED;
+		protection_map[12] = PAGE_READONLY;
+		protection_map[13] = PAGE_READONLY;
+		protection_map[14] = PAGE_SHARED;
+		protection_map[15] = PAGE_SHARED;
+	}
+}
+
+void cpu_cache_init(void)
+{
+	if (cpu_has_3k_cache) {
+		extern void __weak r3k_cache_init(void);
+
+		r3k_cache_init();
+	}
+	if (cpu_has_6k_cache) {
+		extern void __weak r6k_cache_init(void);
+
+		r6k_cache_init();
+	}
+	if (cpu_has_4k_cache) {
+		extern void __weak r4k_cache_init(void);
+
+		r4k_cache_init();
+	}
+	if (cpu_has_8k_cache) {
+		extern void __weak r8k_cache_init(void);
+
+		r8k_cache_init();
+	}
+	if (cpu_has_tx39_cache) {
+		extern void __weak tx39_cache_init(void);
+
+		tx39_cache_init();
+	}
+
+	if (cpu_has_octeon_cache) {
+		extern void __weak octeon_cache_init(void);
+
+		octeon_cache_init();
+	}
+
+	setup_protection_map();
+}
+
+int __weak __uncached_access(struct file *file, unsigned long addr)
+{
+	if (file->f_flags & O_DSYNC)
+		return 1;
+
+	return addr >= __pa(high_memory);
+}