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 */
136