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Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * IBM System z Huge TLB Page Support for Kernel.
3 *
4 * Copyright IBM Corp. 2008
5 * Author(s): Gerald Schaefer <gerald.schaefer@de.ibm.com>
6 */
7
8#ifndef _ASM_S390_HUGETLB_H
9#define _ASM_S390_HUGETLB_H
10
11#include <asm/page.h>
12#include <asm/pgtable.h>
13
14
15#define is_hugepage_only_range(mm, addr, len) 0
16#define hugetlb_free_pgd_range free_pgd_range
17
18void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
19 pte_t *ptep, pte_t pte);
20pte_t huge_ptep_get(pte_t *ptep);
21pte_t huge_ptep_get_and_clear(struct mm_struct *mm,
22 unsigned long addr, pte_t *ptep);
23
24/*
25 * If the arch doesn't supply something else, assume that hugepage
26 * size aligned regions are ok without further preparation.
27 */
28static inline int prepare_hugepage_range(struct file *file,
29 unsigned long addr, unsigned long len)
30{
31 if (len & ~HPAGE_MASK)
32 return -EINVAL;
33 if (addr & ~HPAGE_MASK)
34 return -EINVAL;
35 return 0;
36}
37
38#define hugetlb_prefault_arch_hook(mm) do { } while (0)
39#define arch_clear_hugepage_flags(page) do { } while (0)
40
41int arch_prepare_hugepage(struct page *page);
42void arch_release_hugepage(struct page *page);
43
44static inline void huge_pte_clear(struct mm_struct *mm, unsigned long addr,
45 pte_t *ptep)
46{
47 pte_val(*ptep) = _SEGMENT_ENTRY_EMPTY;
48}
49
50static inline void huge_ptep_clear_flush(struct vm_area_struct *vma,
51 unsigned long address, pte_t *ptep)
52{
53 huge_ptep_get_and_clear(vma->vm_mm, address, ptep);
54}
55
56static inline int huge_ptep_set_access_flags(struct vm_area_struct *vma,
57 unsigned long addr, pte_t *ptep,
58 pte_t pte, int dirty)
59{
60 int changed = !pte_same(huge_ptep_get(ptep), pte);
61 if (changed) {
62 huge_ptep_get_and_clear(vma->vm_mm, addr, ptep);
63 set_huge_pte_at(vma->vm_mm, addr, ptep, pte);
64 }
65 return changed;
66}
67
68static inline void huge_ptep_set_wrprotect(struct mm_struct *mm,
69 unsigned long addr, pte_t *ptep)
70{
71 pte_t pte = huge_ptep_get_and_clear(mm, addr, ptep);
72 set_huge_pte_at(mm, addr, ptep, pte_wrprotect(pte));
73}
74
75static inline pte_t mk_huge_pte(struct page *page, pgprot_t pgprot)
76{
77 return mk_pte(page, pgprot);
78}
79
80static inline int huge_pte_none(pte_t pte)
81{
82 return pte_none(pte);
83}
84
85static inline int huge_pte_write(pte_t pte)
86{
87 return pte_write(pte);
88}
89
90static inline int huge_pte_dirty(pte_t pte)
91{
92 return pte_dirty(pte);
93}
94
95static inline pte_t huge_pte_mkwrite(pte_t pte)
96{
97 return pte_mkwrite(pte);
98}
99
100static inline pte_t huge_pte_mkdirty(pte_t pte)
101{
102 return pte_mkdirty(pte);
103}
104
105static inline pte_t huge_pte_wrprotect(pte_t pte)
106{
107 return pte_wrprotect(pte);
108}
109
110static inline pte_t huge_pte_modify(pte_t pte, pgprot_t newprot)
111{
112 return pte_modify(pte, newprot);
113}
114
115#endif /* _ASM_S390_HUGETLB_H */