v4.19.13 snapshot.
diff --git a/arch/mips/include/asm/page.h b/arch/mips/include/asm/page.h
new file mode 100644
index 0000000..e8cc328
--- /dev/null
+++ b/arch/mips/include/asm/page.h
@@ -0,0 +1,266 @@
+/*
+ * 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 - 1999, 2000, 03 Ralf Baechle
+ * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
+ */
+#ifndef _ASM_PAGE_H
+#define _ASM_PAGE_H
+
+#include <spaces.h>
+#include <linux/const.h>
+#include <linux/kernel.h>
+#include <asm/mipsregs.h>
+
+/*
+ * PAGE_SHIFT determines the page size
+ */
+#ifdef CONFIG_PAGE_SIZE_4KB
+#define PAGE_SHIFT 12
+#endif
+#ifdef CONFIG_PAGE_SIZE_8KB
+#define PAGE_SHIFT 13
+#endif
+#ifdef CONFIG_PAGE_SIZE_16KB
+#define PAGE_SHIFT 14
+#endif
+#ifdef CONFIG_PAGE_SIZE_32KB
+#define PAGE_SHIFT 15
+#endif
+#ifdef CONFIG_PAGE_SIZE_64KB
+#define PAGE_SHIFT 16
+#endif
+#define PAGE_SIZE (_AC(1,UL) << PAGE_SHIFT)
+#define PAGE_MASK (~((1 << PAGE_SHIFT) - 1))
+
+/*
+ * This is used for calculating the real page sizes
+ * for FTLB or VTLB + FTLB configurations.
+ */
+static inline unsigned int page_size_ftlb(unsigned int mmuextdef)
+{
+ switch (mmuextdef) {
+ case MIPS_CONF4_MMUEXTDEF_FTLBSIZEEXT:
+ if (PAGE_SIZE == (1 << 30))
+ return 5;
+ if (PAGE_SIZE == (1llu << 32))
+ return 6;
+ if (PAGE_SIZE > (256 << 10))
+ return 7; /* reserved */
+ /* fall through */
+ case MIPS_CONF4_MMUEXTDEF_VTLBSIZEEXT:
+ return (PAGE_SHIFT - 10) / 2;
+ default:
+ panic("Invalid FTLB configuration with Conf4_mmuextdef=%d value\n",
+ mmuextdef >> 14);
+ }
+}
+
+#ifdef CONFIG_MIPS_HUGE_TLB_SUPPORT
+#define HPAGE_SHIFT (PAGE_SHIFT + PAGE_SHIFT - 3)
+#define HPAGE_SIZE (_AC(1,UL) << HPAGE_SHIFT)
+#define HPAGE_MASK (~(HPAGE_SIZE - 1))
+#define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT)
+#else /* !CONFIG_MIPS_HUGE_TLB_SUPPORT */
+#define HPAGE_SHIFT ({BUILD_BUG(); 0; })
+#define HPAGE_SIZE ({BUILD_BUG(); 0; })
+#define HPAGE_MASK ({BUILD_BUG(); 0; })
+#define HUGETLB_PAGE_ORDER ({BUILD_BUG(); 0; })
+#endif /* CONFIG_MIPS_HUGE_TLB_SUPPORT */
+
+#include <linux/pfn.h>
+
+extern void build_clear_page(void);
+extern void build_copy_page(void);
+
+/*
+ * It's normally defined only for FLATMEM config but it's
+ * used in our early mem init code for all memory models.
+ * So always define it.
+ */
+#ifdef CONFIG_MIPS_AUTO_PFN_OFFSET
+extern unsigned long ARCH_PFN_OFFSET;
+# define ARCH_PFN_OFFSET ARCH_PFN_OFFSET
+#else
+# define ARCH_PFN_OFFSET PFN_UP(PHYS_OFFSET)
+#endif
+
+extern void clear_page(void * page);
+extern void copy_page(void * to, void * from);
+
+extern unsigned long shm_align_mask;
+
+static inline unsigned long pages_do_alias(unsigned long addr1,
+ unsigned long addr2)
+{
+ return (addr1 ^ addr2) & shm_align_mask;
+}
+
+struct page;
+
+static inline void clear_user_page(void *addr, unsigned long vaddr,
+ struct page *page)
+{
+ extern void (*flush_data_cache_page)(unsigned long addr);
+
+ clear_page(addr);
+ if (pages_do_alias((unsigned long) addr, vaddr & PAGE_MASK))
+ flush_data_cache_page((unsigned long)addr);
+}
+
+struct vm_area_struct;
+extern void copy_user_highpage(struct page *to, struct page *from,
+ unsigned long vaddr, struct vm_area_struct *vma);
+
+#define __HAVE_ARCH_COPY_USER_HIGHPAGE
+
+/*
+ * These are used to make use of C type-checking..
+ */
+#ifdef CONFIG_PHYS_ADDR_T_64BIT
+ #ifdef CONFIG_CPU_MIPS32
+ typedef struct { unsigned long pte_low, pte_high; } pte_t;
+ #define pte_val(x) ((x).pte_low | ((unsigned long long)(x).pte_high << 32))
+ #define __pte(x) ({ pte_t __pte = {(x), ((unsigned long long)(x)) >> 32}; __pte; })
+ #else
+ typedef struct { unsigned long long pte; } pte_t;
+ #define pte_val(x) ((x).pte)
+ #define __pte(x) ((pte_t) { (x) } )
+ #endif
+#else
+typedef struct { unsigned long pte; } pte_t;
+#define pte_val(x) ((x).pte)
+#define __pte(x) ((pte_t) { (x) } )
+#endif
+typedef struct page *pgtable_t;
+
+/*
+ * Right now we don't support 4-level pagetables, so all pud-related
+ * definitions come from <asm-generic/pgtable-nopud.h>.
+ */
+
+/*
+ * Finall the top of the hierarchy, the pgd
+ */
+typedef struct { unsigned long pgd; } pgd_t;
+#define pgd_val(x) ((x).pgd)
+#define __pgd(x) ((pgd_t) { (x) } )
+
+/*
+ * Manipulate page protection bits
+ */
+typedef struct { unsigned long pgprot; } pgprot_t;
+#define pgprot_val(x) ((x).pgprot)
+#define __pgprot(x) ((pgprot_t) { (x) } )
+
+/*
+ * On R4000-style MMUs where a TLB entry is mapping a adjacent even / odd
+ * pair of pages we only have a single global bit per pair of pages. When
+ * writing to the TLB make sure we always have the bit set for both pages
+ * or none. This macro is used to access the `buddy' of the pte we're just
+ * working on.
+ */
+#define ptep_buddy(x) ((pte_t *)((unsigned long)(x) ^ sizeof(pte_t)))
+
+/*
+ * __pa()/__va() should be used only during mem init.
+ */
+static inline unsigned long ___pa(unsigned long x)
+{
+ if (IS_ENABLED(CONFIG_64BIT)) {
+ /*
+ * For MIPS64 the virtual address may either be in one of
+ * the compatibility segements ckseg0 or ckseg1, or it may
+ * be in xkphys.
+ */
+ return x < CKSEG0 ? XPHYSADDR(x) : CPHYSADDR(x);
+ }
+
+ if (!IS_ENABLED(CONFIG_EVA)) {
+ /*
+ * We're using the standard MIPS32 legacy memory map, ie.
+ * the address x is going to be in kseg0 or kseg1. We can
+ * handle either case by masking out the desired bits using
+ * CPHYSADDR.
+ */
+ return CPHYSADDR(x);
+ }
+
+ /*
+ * EVA is in use so the memory map could be anything, making it not
+ * safe to just mask out bits.
+ */
+ return x - PAGE_OFFSET + PHYS_OFFSET;
+}
+#define __pa(x) ___pa((unsigned long)(x))
+#define __va(x) ((void *)((unsigned long)(x) + PAGE_OFFSET - PHYS_OFFSET))
+#include <asm/io.h>
+
+/*
+ * RELOC_HIDE was originally added by 6007b903dfe5f1d13e0c711ac2894bdd4a61b1ad
+ * (lmo) rsp. 8431fd094d625b94d364fe393076ccef88e6ce18 (kernel.org). The
+ * discussion can be found in lkml posting
+ * <a2ebde260608230500o3407b108hc03debb9da6e62c@mail.gmail.com> which is
+ * archived at http://lists.linuxcoding.com/kernel/2006-q3/msg17360.html
+ *
+ * It is unclear if the misscompilations mentioned in
+ * http://lkml.org/lkml/2010/8/8/138 also affect MIPS so we keep this one
+ * until GCC 3.x has been retired before we can apply
+ * https://patchwork.linux-mips.org/patch/1541/
+ */
+
+#ifndef __pa_symbol
+#define __pa_symbol(x) __pa(RELOC_HIDE((unsigned long)(x), 0))
+#endif
+
+#define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
+
+#ifdef CONFIG_FLATMEM
+
+static inline int pfn_valid(unsigned long pfn)
+{
+ /* avoid <linux/mm.h> include hell */
+ extern unsigned long max_mapnr;
+ unsigned long pfn_offset = ARCH_PFN_OFFSET;
+
+ return pfn >= pfn_offset && pfn < max_mapnr;
+}
+
+#elif defined(CONFIG_SPARSEMEM)
+
+/* pfn_valid is defined in linux/mmzone.h */
+
+#elif defined(CONFIG_NEED_MULTIPLE_NODES)
+
+#define pfn_valid(pfn) \
+({ \
+ unsigned long __pfn = (pfn); \
+ int __n = pfn_to_nid(__pfn); \
+ ((__n >= 0) ? (__pfn < NODE_DATA(__n)->node_start_pfn + \
+ NODE_DATA(__n)->node_spanned_pages) \
+ : 0); \
+})
+
+#endif
+
+#define virt_to_pfn(kaddr) PFN_DOWN(virt_to_phys((void *)(kaddr)))
+#define virt_to_page(kaddr) pfn_to_page(virt_to_pfn(kaddr))
+
+extern int __virt_addr_valid(const volatile void *kaddr);
+#define virt_addr_valid(kaddr) \
+ __virt_addr_valid((const volatile void *) (kaddr))
+
+#define VM_DATA_DEFAULT_FLAGS \
+ (VM_READ | VM_WRITE | \
+ ((current->personality & READ_IMPLIES_EXEC) ? VM_EXEC : 0) | \
+ VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
+
+#define UNCAC_ADDR(addr) (UNCAC_BASE + __pa(addr))
+#define CAC_ADDR(addr) ((unsigned long)__va((addr) - UNCAC_BASE))
+
+#include <asm-generic/memory_model.h>
+#include <asm-generic/getorder.h>
+
+#endif /* _ASM_PAGE_H */