v4.19.13 snapshot.
diff --git a/arch/mips/mm/pgtable-64.c b/arch/mips/mm/pgtable-64.c
new file mode 100644
index 0000000..6fd6e96
--- /dev/null
+++ b/arch/mips/mm/pgtable-64.c
@@ -0,0 +1,126 @@
+/*
+ * 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) 1999, 2000 by Silicon Graphics
+ * Copyright (C) 2003 by Ralf Baechle
+ */
+#include <linux/export.h>
+#include <linux/init.h>
+#include <linux/mm.h>
+#include <asm/fixmap.h>
+#include <asm/pgtable.h>
+#include <asm/pgalloc.h>
+#include <asm/tlbflush.h>
+
+void pgd_init(unsigned long page)
+{
+ unsigned long *p, *end;
+ unsigned long entry;
+
+#if !defined(__PAGETABLE_PUD_FOLDED)
+ entry = (unsigned long)invalid_pud_table;
+#elif !defined(__PAGETABLE_PMD_FOLDED)
+ entry = (unsigned long)invalid_pmd_table;
+#else
+ entry = (unsigned long)invalid_pte_table;
+#endif
+
+ p = (unsigned long *) page;
+ end = p + PTRS_PER_PGD;
+
+ do {
+ p[0] = entry;
+ p[1] = entry;
+ p[2] = entry;
+ p[3] = entry;
+ p[4] = entry;
+ p += 8;
+ p[-3] = entry;
+ p[-2] = entry;
+ p[-1] = entry;
+ } while (p != end);
+}
+
+#ifndef __PAGETABLE_PMD_FOLDED
+void pmd_init(unsigned long addr, unsigned long pagetable)
+{
+ unsigned long *p, *end;
+
+ p = (unsigned long *) addr;
+ end = p + PTRS_PER_PMD;
+
+ do {
+ p[0] = pagetable;
+ p[1] = pagetable;
+ p[2] = pagetable;
+ p[3] = pagetable;
+ p[4] = pagetable;
+ p += 8;
+ p[-3] = pagetable;
+ p[-2] = pagetable;
+ p[-1] = pagetable;
+ } while (p != end);
+}
+EXPORT_SYMBOL_GPL(pmd_init);
+#endif
+
+#ifndef __PAGETABLE_PUD_FOLDED
+void pud_init(unsigned long addr, unsigned long pagetable)
+{
+ unsigned long *p, *end;
+
+ p = (unsigned long *)addr;
+ end = p + PTRS_PER_PUD;
+
+ do {
+ p[0] = pagetable;
+ p[1] = pagetable;
+ p[2] = pagetable;
+ p[3] = pagetable;
+ p[4] = pagetable;
+ p += 8;
+ p[-3] = pagetable;
+ p[-2] = pagetable;
+ p[-1] = pagetable;
+ } while (p != end);
+}
+#endif
+
+pmd_t mk_pmd(struct page *page, pgprot_t prot)
+{
+ pmd_t pmd;
+
+ pmd_val(pmd) = (page_to_pfn(page) << _PFN_SHIFT) | pgprot_val(prot);
+
+ return pmd;
+}
+
+void set_pmd_at(struct mm_struct *mm, unsigned long addr,
+ pmd_t *pmdp, pmd_t pmd)
+{
+ *pmdp = pmd;
+ flush_tlb_all();
+}
+
+void __init pagetable_init(void)
+{
+ unsigned long vaddr;
+ pgd_t *pgd_base;
+
+ /* Initialize the entire pgd. */
+ pgd_init((unsigned long)swapper_pg_dir);
+#ifndef __PAGETABLE_PUD_FOLDED
+ pud_init((unsigned long)invalid_pud_table, (unsigned long)invalid_pmd_table);
+#endif
+#ifndef __PAGETABLE_PMD_FOLDED
+ pmd_init((unsigned long)invalid_pmd_table, (unsigned long)invalid_pte_table);
+#endif
+ pgd_base = swapper_pg_dir;
+ /*
+ * Fixed mappings:
+ */
+ vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK;
+ fixrange_init(vaddr, vaddr + FIXADDR_SIZE, pgd_base);
+}