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
14#define __HAVE_ARCH_PREPARE_HUGEPAGE_RANGE
15static inline int prepare_hugepage_range(struct file *file,
16					 unsigned long addr,
17					 unsigned long len)
18{
19	unsigned long task_size = STACK_TOP;
20	struct hstate *h = hstate_file(file);
21
22	if (len & ~huge_page_mask(h))
23		return -EINVAL;
24	if (addr & ~huge_page_mask(h))
25		return -EINVAL;
26	if (len > task_size)
27		return -ENOMEM;
28	if (task_size - len < addr)
29		return -EINVAL;
30	return 0;
31}
32
33#define __HAVE_ARCH_HUGE_PTEP_GET_AND_CLEAR
34static inline pte_t huge_ptep_get_and_clear(struct mm_struct *mm,
35					    unsigned long addr, pte_t *ptep)
36{
37	pte_t clear;
38	pte_t pte = *ptep;
39
40	pte_val(clear) = (unsigned long)invalid_pte_table;
41	set_pte_at(mm, addr, ptep, clear);
42	return pte;
43}
44
45#define __HAVE_ARCH_HUGE_PTEP_CLEAR_FLUSH
46static inline void huge_ptep_clear_flush(struct vm_area_struct *vma,
47					 unsigned long addr, pte_t *ptep)
48{
49	/*
50	 * clear the huge pte entry firstly, so that the other smp threads will
51	 * not get old pte entry after finishing flush_tlb_page and before
52	 * setting new huge pte entry
53	 */
54	huge_ptep_get_and_clear(vma->vm_mm, addr, ptep);
55	flush_tlb_page(vma, addr);
56}
57
58#define __HAVE_ARCH_HUGE_PTE_NONE
59static inline int huge_pte_none(pte_t pte)
60{
61	unsigned long val = pte_val(pte) & ~_PAGE_GLOBAL;
62	return !val || (val == (unsigned long)invalid_pte_table);
63}
64
65#define __HAVE_ARCH_HUGE_PTEP_SET_ACCESS_FLAGS
66static inline int huge_ptep_set_access_flags(struct vm_area_struct *vma,
67					     unsigned long addr,
68					     pte_t *ptep, pte_t pte,
69					     int dirty)
70{
71	int changed = !pte_same(*ptep, pte);
72
73	if (changed) {
74		set_pte_at(vma->vm_mm, addr, ptep, pte);
75		/*
76		 * There could be some standard sized pages in there,
77		 * get them all.
78		 */
79		flush_tlb_range(vma, addr, addr + HPAGE_SIZE);
80	}
81	return changed;
82}
83
84#include <asm-generic/hugetlb.h>
85
86#endif /* __ASM_HUGETLB_H */
87