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
 20
 21static inline int is_hugepage_only_range(struct mm_struct *mm,
 22					 unsigned long addr,
 23					 unsigned long len) {
 24	return 0;
 25}
 26
 27/*
 28 * If the arch doesn't supply something else, assume that hugepage
 29 * size aligned regions are ok without further preparation.
 30 */
 31static inline int prepare_hugepage_range(struct file *file,
 32					 unsigned long addr, unsigned long len)
 33{
 34	struct hstate *h = hstate_file(file);
 35	if (len & ~huge_page_mask(h))
 36		return -EINVAL;
 37	if (addr & ~huge_page_mask(h))
 38		return -EINVAL;
 39	return 0;
 40}
 41
 42static inline void hugetlb_prefault_arch_hook(struct mm_struct *mm)
 43{
 44}
 45
 46static inline void hugetlb_free_pgd_range(struct mmu_gather *tlb,
 47					  unsigned long addr, unsigned long end,
 48					  unsigned long floor,
 49					  unsigned long ceiling)
 50{
 51	free_pgd_range(tlb, addr, end, floor, ceiling);
 52}
 53
 54static inline void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
 55				   pte_t *ptep, pte_t pte)
 56{
 57	set_pte(ptep, pte);
 58}
 59
 60static inline pte_t huge_ptep_get_and_clear(struct mm_struct *mm,
 61					    unsigned long addr, pte_t *ptep)
 62{
 63	return ptep_get_and_clear(mm, addr, ptep);
 64}
 65
 66static inline void huge_ptep_clear_flush(struct vm_area_struct *vma,
 67					 unsigned long addr, pte_t *ptep)
 68{
 69	ptep_clear_flush(vma, addr, ptep);
 70}
 71
 72static inline int huge_pte_none(pte_t pte)
 73{
 74	return pte_none(pte);
 75}
 76
 77static inline pte_t huge_pte_wrprotect(pte_t pte)
 78{
 79	return pte_wrprotect(pte);
 80}
 81
 82static inline void huge_ptep_set_wrprotect(struct mm_struct *mm,
 83					   unsigned long addr, pte_t *ptep)
 84{
 85	ptep_set_wrprotect(mm, addr, ptep);
 86}
 87
 88static inline int huge_ptep_set_access_flags(struct vm_area_struct *vma,
 89					     unsigned long addr, pte_t *ptep,
 90					     pte_t pte, int dirty)
 91{
 92	return ptep_set_access_flags(vma, addr, ptep, pte, dirty);
 93}
 94
 95static inline pte_t huge_ptep_get(pte_t *ptep)
 96{
 97	return *ptep;
 98}
 99
100static inline int arch_prepare_hugepage(struct page *page)
101{
102	return 0;
103}
104
105static inline void arch_release_hugepage(struct page *page)
106{
107}
108
109#ifdef CONFIG_HUGETLB_SUPER_PAGES
110static inline pte_t arch_make_huge_pte(pte_t entry, struct vm_area_struct *vma,
111				       struct page *page, int writable)
112{
113	size_t pagesize = huge_page_size(hstate_vma(vma));
114	if (pagesize != PUD_SIZE && pagesize != PMD_SIZE)
115		entry = pte_mksuper(entry);
116	return entry;
117}
118#define arch_make_huge_pte arch_make_huge_pte
119
120/* Sizes to scale up page size for PTEs with HV_PTE_SUPER bit. */
121enum {
122	HUGE_SHIFT_PGDIR = 0,
123	HUGE_SHIFT_PMD = 1,
124	HUGE_SHIFT_PAGE = 2,
125	HUGE_SHIFT_ENTRIES
126};
127extern int huge_shift[HUGE_SHIFT_ENTRIES];
128#endif
129
130#endif /* _ASM_TILE_HUGETLB_H */