/*
 * arch/arm64/include/asm/hugetlb.h
 *
 * Copyright (C) 2013 Linaro Ltd.
 *
 * Based on arch/x86/include/asm/hugetlb.h
 *
 * 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.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#ifndef __ASM_HUGETLB_H
#define __ASM_HUGETLB_H

#include <asm/page.h>

static inline pte_t huge_ptep_get(pte_t *ptep)
{
	return READ_ONCE(*ptep);
}

static inline int is_hugepage_only_range(struct mm_struct *mm,
					 unsigned long addr, unsigned long len)
{
	return 0;
}

static inline int prepare_hugepage_range(struct file *file,
					 unsigned long addr, unsigned long len)
{
	struct hstate *h = hstate_file(file);
	if (len & ~huge_page_mask(h))
		return -EINVAL;
	if (addr & ~huge_page_mask(h))
		return -EINVAL;
	return 0;
}

static inline int huge_pte_none(pte_t pte)
{
	return pte_none(pte);
}

static inline pte_t huge_pte_wrprotect(pte_t pte)
{
	return pte_wrprotect(pte);
}

static inline void arch_clear_hugepage_flags(struct page *page)
{
	clear_bit(PG_dcache_clean, &page->flags);
}

extern pte_t arch_make_huge_pte(pte_t entry, struct vm_area_struct *vma,
				struct page *page, int writable);
#define arch_make_huge_pte arch_make_huge_pte
extern void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
			    pte_t *ptep, pte_t pte);
extern int huge_ptep_set_access_flags(struct vm_area_struct *vma,
				      unsigned long addr, pte_t *ptep,
				      pte_t pte, int dirty);
extern pte_t huge_ptep_get_and_clear(struct mm_struct *mm,
				     unsigned long addr, pte_t *ptep);
extern void huge_ptep_set_wrprotect(struct mm_struct *mm,
				    unsigned long addr, pte_t *ptep);
extern void huge_ptep_clear_flush(struct vm_area_struct *vma,
				  unsigned long addr, pte_t *ptep);
#define __HAVE_ARCH_HUGE_PTE_CLEAR
extern void huge_pte_clear(struct mm_struct *mm, unsigned long addr,
			   pte_t *ptep, unsigned long sz);
extern void set_huge_swap_pte_at(struct mm_struct *mm, unsigned long addr,
				 pte_t *ptep, pte_t pte, unsigned long sz);
#define set_huge_swap_pte_at set_huge_swap_pte_at

#include <asm-generic/hugetlb.h>

#ifdef CONFIG_ARCH_HAS_GIGANTIC_PAGE
static inline bool gigantic_page_supported(void) { return true; }
#endif

#endif /* __ASM_HUGETLB_H */