1/*
  2 * Copyright 2010 Tilera Corporation. All Rights Reserved.
  3 *
  4 *   This program is free software; you can redistribute it and/or
  5 *   modify it under the terms of the GNU General Public License
  6 *   as published by the Free Software Foundation, version 2.
  7 *
  8 *   This program is distributed in the hope that it will be useful, but
  9 *   WITHOUT ANY WARRANTY; without even the implied warranty of
 10 *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
 11 *   NON INFRINGEMENT.  See the GNU General Public License for
 12 *   more details.
 13 */
 14
 15#ifndef _ASM_TILE_HUGETLB_H
 16#define _ASM_TILE_HUGETLB_H
 17
 18#include <asm/page.h>
 19#include <asm-generic/hugetlb.h>
 20
 21
 22static inline int is_hugepage_only_range(struct mm_struct *mm,
 23					 unsigned long addr,
 24					 unsigned long len) {
 25	return 0;
 26}
 27
 28/*
 29 * If the arch doesn't supply something else, assume that hugepage
 30 * size aligned regions are ok without further preparation.
 31 */
 32static inline int prepare_hugepage_range(struct file *file,
 33					 unsigned long addr, unsigned long len)
 34{
 35	struct hstate *h = hstate_file(file);
 36	if (len & ~huge_page_mask(h))
 37		return -EINVAL;
 38	if (addr & ~huge_page_mask(h))
 39		return -EINVAL;
 40	return 0;
 41}
 42
 43static inline void hugetlb_free_pgd_range(struct mmu_gather *tlb,
 44					  unsigned long addr, unsigned long end,
 45					  unsigned long floor,
 46					  unsigned long ceiling)
 47{
 48	free_pgd_range(tlb, addr, end, floor, ceiling);
 49}
 50
 51static inline void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
 52				   pte_t *ptep, pte_t pte)
 53{
 54	set_pte(ptep, pte);
 55}
 56
 57static inline pte_t huge_ptep_get_and_clear(struct mm_struct *mm,
 58					    unsigned long addr, pte_t *ptep)
 59{
 60	return ptep_get_and_clear(mm, addr, ptep);
 61}
 62
 63static inline void huge_ptep_clear_flush(struct vm_area_struct *vma,
 64					 unsigned long addr, pte_t *ptep)
 65{
 66	ptep_clear_flush(vma, addr, ptep);
 67}
 68
 69static inline int huge_pte_none(pte_t pte)
 70{
 71	return pte_none(pte);
 72}
 73
 74static inline pte_t huge_pte_wrprotect(pte_t pte)
 75{
 76	return pte_wrprotect(pte);
 77}
 78
 79static inline void huge_ptep_set_wrprotect(struct mm_struct *mm,
 80					   unsigned long addr, pte_t *ptep)
 81{
 82	ptep_set_wrprotect(mm, addr, ptep);
 83}
 84
 85static inline int huge_ptep_set_access_flags(struct vm_area_struct *vma,
 86					     unsigned long addr, pte_t *ptep,
 87					     pte_t pte, int dirty)
 88{
 89	return ptep_set_access_flags(vma, addr, ptep, pte, dirty);
 90}
 91
 92static inline pte_t huge_ptep_get(pte_t *ptep)
 93{
 94	return *ptep;
 95}
 96
 97static inline void arch_clear_hugepage_flags(struct page *page)
 98{
 99}
100
101#ifdef CONFIG_HUGETLB_SUPER_PAGES
102static inline pte_t arch_make_huge_pte(pte_t entry, struct vm_area_struct *vma,
103				       struct page *page, int writable)
104{
105	size_t pagesize = huge_page_size(hstate_vma(vma));
106	if (pagesize != PUD_SIZE && pagesize != PMD_SIZE)
107		entry = pte_mksuper(entry);
108	return entry;
109}
110#define arch_make_huge_pte arch_make_huge_pte
111
112/* Sizes to scale up page size for PTEs with HV_PTE_SUPER bit. */
113enum {
114	HUGE_SHIFT_PGDIR = 0,
115	HUGE_SHIFT_PMD = 1,
116	HUGE_SHIFT_PAGE = 2,
117	HUGE_SHIFT_ENTRIES
118};
119extern int huge_shift[HUGE_SHIFT_ENTRIES];
120#endif
121
122#endif /* _ASM_TILE_HUGETLB_H */