1/*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License.  See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * Copyright (C) 2008, 2009 Cavium Networks, Inc.
7 */
8
9#ifndef __ASM_HUGETLB_H
10#define __ASM_HUGETLB_H
11
12#include <asm/page.h>
13#include <asm-generic/hugetlb.h>
14
15
16static inline int is_hugepage_only_range(struct mm_struct *mm,
17					 unsigned long addr,
18					 unsigned long len)
19{
20	return 0;
21}
22
23static inline int prepare_hugepage_range(struct file *file,
24					 unsigned long addr,
25					 unsigned long len)
26{
27	unsigned long task_size = STACK_TOP;
28	struct hstate *h = hstate_file(file);
29
30	if (len & ~huge_page_mask(h))
31		return -EINVAL;
32	if (addr & ~huge_page_mask(h))
33		return -EINVAL;
34	if (len > task_size)
35		return -ENOMEM;
36	if (task_size - len < addr)
37		return -EINVAL;
38	return 0;
39}
40
41static inline void hugetlb_free_pgd_range(struct mmu_gather *tlb,
42					  unsigned long addr,
43					  unsigned long end,
44					  unsigned long floor,
45					  unsigned long ceiling)
46{
47	free_pgd_range(tlb, addr, end, floor, ceiling);
48}
49
50static inline void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
51				   pte_t *ptep, pte_t pte)
52{
53	set_pte_at(mm, addr, ptep, pte);
54}
55
56static inline pte_t huge_ptep_get_and_clear(struct mm_struct *mm,
57					    unsigned long addr, pte_t *ptep)
58{
59	pte_t clear;
60	pte_t pte = *ptep;
61
62	pte_val(clear) = (unsigned long)invalid_pte_table;
63	set_pte_at(mm, addr, ptep, clear);
64	return pte;
65}
66
67static inline void huge_ptep_clear_flush(struct vm_area_struct *vma,
68					 unsigned long addr, pte_t *ptep)
69{
70	flush_tlb_page(vma, addr & huge_page_mask(hstate_vma(vma)));
71}
72
73static inline int huge_pte_none(pte_t pte)
74{
75	unsigned long val = pte_val(pte) & ~_PAGE_GLOBAL;
76	return !val || (val == (unsigned long)invalid_pte_table);
77}
78
79static inline pte_t huge_pte_wrprotect(pte_t pte)
80{
81	return pte_wrprotect(pte);
82}
83
84static inline void huge_ptep_set_wrprotect(struct mm_struct *mm,
85					   unsigned long addr, pte_t *ptep)
86{
87	ptep_set_wrprotect(mm, addr, ptep);
88}
89
90static inline int huge_ptep_set_access_flags(struct vm_area_struct *vma,
91					     unsigned long addr,
92					     pte_t *ptep, pte_t pte,
93					     int dirty)
94{
95	int changed = !pte_same(*ptep, pte);
96
97	if (changed) {
98		set_pte_at(vma->vm_mm, addr, ptep, pte);
99		/*
100		 * There could be some standard sized pages in there,
101		 * get them all.
102		 */
103		flush_tlb_range(vma, addr, addr + HPAGE_SIZE);
104	}
105	return changed;
106}
107
108static inline pte_t huge_ptep_get(pte_t *ptep)
109{
110	return *ptep;
111}
112
113static inline void arch_clear_hugepage_flags(struct page *page)
114{
115}
116
117#endif /* __ASM_HUGETLB_H */
118