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_prefault_arch_hook(struct mm_struct *mm)
 44{
 45}
 46
 47static inline void hugetlb_free_pgd_range(struct mmu_gather *tlb,
 48					  unsigned long addr, unsigned long end,
 49					  unsigned long floor,
 50					  unsigned long ceiling)
 51{
 52	free_pgd_range(tlb, addr, end, floor, ceiling);
 53}
 54
 55static inline void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
 56				   pte_t *ptep, pte_t pte)
 57{
 58	set_pte(ptep, pte);
 59}
 60
 61static inline pte_t huge_ptep_get_and_clear(struct mm_struct *mm,
 62					    unsigned long addr, pte_t *ptep)
 63{
 64	return ptep_get_and_clear(mm, addr, ptep);
 65}
 66
 67static inline void huge_ptep_clear_flush(struct vm_area_struct *vma,
 68					 unsigned long addr, pte_t *ptep)
 69{
 70	ptep_clear_flush(vma, addr, ptep);
 71}
 72
 73static inline int huge_pte_none(pte_t pte)
 74{
 75	return pte_none(pte);
 76}
 77
 78static inline pte_t huge_pte_wrprotect(pte_t pte)
 79{
 80	return pte_wrprotect(pte);
 81}
 82
 83static inline void huge_ptep_set_wrprotect(struct mm_struct *mm,
 84					   unsigned long addr, pte_t *ptep)
 85{
 86	ptep_set_wrprotect(mm, addr, ptep);
 87}
 88
 89static inline int huge_ptep_set_access_flags(struct vm_area_struct *vma,
 90					     unsigned long addr, pte_t *ptep,
 91					     pte_t pte, int dirty)
 92{
 93	return ptep_set_access_flags(vma, addr, ptep, pte, dirty);
 94}
 95
 96static inline pte_t huge_ptep_get(pte_t *ptep)
 97{
 98	return *ptep;
 99}
100
101static inline int arch_prepare_hugepage(struct page *page)
102{
103	return 0;
104}
105
106static inline void arch_release_hugepage(struct page *page)
107{
108}
109
110static inline void arch_clear_hugepage_flags(struct page *page)
111{
112}
113
114#ifdef CONFIG_HUGETLB_SUPER_PAGES
115static inline pte_t arch_make_huge_pte(pte_t entry, struct vm_area_struct *vma,
116				       struct page *page, int writable)
117{
118	size_t pagesize = huge_page_size(hstate_vma(vma));
119	if (pagesize != PUD_SIZE && pagesize != PMD_SIZE)
120		entry = pte_mksuper(entry);
121	return entry;
122}
123#define arch_make_huge_pte arch_make_huge_pte
124
125/* Sizes to scale up page size for PTEs with HV_PTE_SUPER bit. */
126enum {
127	HUGE_SHIFT_PGDIR = 0,
128	HUGE_SHIFT_PMD = 1,
129	HUGE_SHIFT_PAGE = 2,
130	HUGE_SHIFT_ENTRIES
131};
132extern int huge_shift[HUGE_SHIFT_ENTRIES];
133#endif
134
135#endif /* _ASM_TILE_HUGETLB_H */