[Feature]add MT2731_MP2_MR2_SVN388 baseline version
Change-Id: Ief04314834b31e27effab435d3ca8ba33b499059
diff --git a/src/kernel/linux/v4.14/arch/arm/mm/copypage-v6.c b/src/kernel/linux/v4.14/arch/arm/mm/copypage-v6.c
new file mode 100644
index 0000000..7042334
--- /dev/null
+++ b/src/kernel/linux/v4.14/arch/arm/mm/copypage-v6.c
@@ -0,0 +1,140 @@
+/*
+ * linux/arch/arm/mm/copypage-v6.c
+ *
+ * Copyright (C) 2002 Deep Blue Solutions Ltd, All Rights Reserved.
+ *
+ * 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.
+ */
+#include <linux/init.h>
+#include <linux/spinlock.h>
+#include <linux/mm.h>
+#include <linux/highmem.h>
+
+#include <asm/pgtable.h>
+#include <asm/shmparam.h>
+#include <asm/tlbflush.h>
+#include <asm/cacheflush.h>
+#include <asm/cachetype.h>
+
+#include "mm.h"
+
+#if SHMLBA > 16384
+#error FIX ME
+#endif
+
+static DEFINE_RAW_SPINLOCK(v6_lock);
+
+/*
+ * Copy the user page. No aliasing to deal with so we can just
+ * attack the kernel's existing mapping of these pages.
+ */
+static void v6_copy_user_highpage_nonaliasing(struct page *to,
+ struct page *from, unsigned long vaddr, struct vm_area_struct *vma)
+{
+ void *kto, *kfrom;
+
+ kfrom = kmap_atomic(from);
+ kto = kmap_atomic(to);
+ copy_page(kto, kfrom);
+ kunmap_atomic(kto);
+ kunmap_atomic(kfrom);
+}
+
+/*
+ * Clear the user page. No aliasing to deal with so we can just
+ * attack the kernel's existing mapping of this page.
+ */
+static void v6_clear_user_highpage_nonaliasing(struct page *page, unsigned long vaddr)
+{
+ void *kaddr = kmap_atomic(page);
+ clear_page(kaddr);
+ kunmap_atomic(kaddr);
+}
+
+/*
+ * Discard data in the kernel mapping for the new page.
+ * FIXME: needs this MCRR to be supported.
+ */
+static void discard_old_kernel_data(void *kto)
+{
+ __asm__("mcrr p15, 0, %1, %0, c6 @ 0xec401f06"
+ :
+ : "r" (kto),
+ "r" ((unsigned long)kto + PAGE_SIZE - 1)
+ : "cc");
+}
+
+/*
+ * Copy the page, taking account of the cache colour.
+ */
+static void v6_copy_user_highpage_aliasing(struct page *to,
+ struct page *from, unsigned long vaddr, struct vm_area_struct *vma)
+{
+ unsigned int offset = CACHE_COLOUR(vaddr);
+ unsigned long kfrom, kto;
+
+ if (!test_and_set_bit(PG_dcache_clean, &from->flags))
+ __flush_dcache_page(page_mapping(from), from);
+
+ /* FIXME: not highmem safe */
+ discard_old_kernel_data(page_address(to));
+
+ /*
+ * Now copy the page using the same cache colour as the
+ * pages ultimate destination.
+ */
+ raw_spin_lock(&v6_lock);
+
+ kfrom = COPYPAGE_V6_FROM + (offset << PAGE_SHIFT);
+ kto = COPYPAGE_V6_TO + (offset << PAGE_SHIFT);
+
+ set_top_pte(kfrom, mk_pte(from, PAGE_KERNEL));
+ set_top_pte(kto, mk_pte(to, PAGE_KERNEL));
+
+ copy_page((void *)kto, (void *)kfrom);
+
+ raw_spin_unlock(&v6_lock);
+}
+
+/*
+ * Clear the user page. We need to deal with the aliasing issues,
+ * so remap the kernel page into the same cache colour as the user
+ * page.
+ */
+static void v6_clear_user_highpage_aliasing(struct page *page, unsigned long vaddr)
+{
+ unsigned long to = COPYPAGE_V6_TO + (CACHE_COLOUR(vaddr) << PAGE_SHIFT);
+
+ /* FIXME: not highmem safe */
+ discard_old_kernel_data(page_address(page));
+
+ /*
+ * Now clear the page using the same cache colour as
+ * the pages ultimate destination.
+ */
+ raw_spin_lock(&v6_lock);
+
+ set_top_pte(to, mk_pte(page, PAGE_KERNEL));
+ clear_page((void *)to);
+
+ raw_spin_unlock(&v6_lock);
+}
+
+struct cpu_user_fns v6_user_fns __initdata = {
+ .cpu_clear_user_highpage = v6_clear_user_highpage_nonaliasing,
+ .cpu_copy_user_highpage = v6_copy_user_highpage_nonaliasing,
+};
+
+static int __init v6_userpage_init(void)
+{
+ if (cache_is_vipt_aliasing()) {
+ cpu_user.cpu_clear_user_highpage = v6_clear_user_highpage_aliasing;
+ cpu_user.cpu_copy_user_highpage = v6_copy_user_highpage_aliasing;
+ }
+
+ return 0;
+}
+
+core_initcall(v6_userpage_init);