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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);
20
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22
23
24
25static inline int prepare_hugepage_range(struct file *file,
26 unsigned long addr, unsigned long len)
27{
28 if (len & ~HPAGE_MASK)
29 return -EINVAL;
30 if (addr & ~HPAGE_MASK)
31 return -EINVAL;
32 return 0;
33}
34
35#define hugetlb_prefault_arch_hook(mm) do { } while (0)
36#define arch_clear_hugepage_flags(page) do { } while (0)
37
38int arch_prepare_hugepage(struct page *page);
39void arch_release_hugepage(struct page *page);
40
41static inline pte_t huge_pte_wrprotect(pte_t pte)
42{
43 pte_val(pte) |= _PAGE_RO;
44 return pte;
45}
46
47static inline int huge_pte_none(pte_t pte)
48{
49 return (pte_val(pte) & _SEGMENT_ENTRY_INV) &&
50 !(pte_val(pte) & _SEGMENT_ENTRY_RO);
51}
52
53static inline pte_t huge_ptep_get(pte_t *ptep)
54{
55 pte_t pte = *ptep;
56 unsigned long mask;
57
58 if (!MACHINE_HAS_HPAGE) {
59 ptep = (pte_t *) (pte_val(pte) & _SEGMENT_ENTRY_ORIGIN);
60 if (ptep) {
61 mask = pte_val(pte) &
62 (_SEGMENT_ENTRY_INV | _SEGMENT_ENTRY_RO);
63 pte = pte_mkhuge(*ptep);
64 pte_val(pte) |= mask;
65 }
66 }
67 return pte;
68}
69
70static inline void __pmd_csp(pmd_t *pmdp)
71{
72 register unsigned long reg2 asm("2") = pmd_val(*pmdp);
73 register unsigned long reg3 asm("3") = pmd_val(*pmdp) |
74 _SEGMENT_ENTRY_INV;
75 register unsigned long reg4 asm("4") = ((unsigned long) pmdp) + 5;
76
77 asm volatile(
78 " csp %1,%3"
79 : "=m" (*pmdp)
80 : "d" (reg2), "d" (reg3), "d" (reg4), "m" (*pmdp) : "cc");
81}
82
83static inline void huge_ptep_invalidate(struct mm_struct *mm,
84 unsigned long address, pte_t *ptep)
85{
86 pmd_t *pmdp = (pmd_t *) ptep;
87
88 if (MACHINE_HAS_IDTE)
89 __pmd_idte(address, pmdp);
90 else
91 __pmd_csp(pmdp);
92 pmd_val(*pmdp) = _SEGMENT_ENTRY_INV | _SEGMENT_ENTRY;
93}
94
95static inline pte_t huge_ptep_get_and_clear(struct mm_struct *mm,
96 unsigned long addr, pte_t *ptep)
97{
98 pte_t pte = huge_ptep_get(ptep);
99
100 huge_ptep_invalidate(mm, addr, ptep);
101 return pte;
102}
103
104#define huge_ptep_set_access_flags(__vma, __addr, __ptep, __entry, __dirty) \
105({ \
106 int __changed = !pte_same(huge_ptep_get(__ptep), __entry); \
107 if (__changed) { \
108 huge_ptep_invalidate((__vma)->vm_mm, __addr, __ptep); \
109 set_huge_pte_at((__vma)->vm_mm, __addr, __ptep, __entry); \
110 } \
111 __changed; \
112})
113
114#define huge_ptep_set_wrprotect(__mm, __addr, __ptep) \
115({ \
116 pte_t __pte = huge_ptep_get(__ptep); \
117 if (huge_pte_write(__pte)) { \
118 huge_ptep_invalidate(__mm, __addr, __ptep); \
119 set_huge_pte_at(__mm, __addr, __ptep, \
120 huge_pte_wrprotect(__pte)); \
121 } \
122})
123
124static inline void huge_ptep_clear_flush(struct vm_area_struct *vma,
125 unsigned long address, pte_t *ptep)
126{
127 huge_ptep_invalidate(vma->vm_mm, address, ptep);
128}
129
130static inline pte_t mk_huge_pte(struct page *page, pgprot_t pgprot)
131{
132 pte_t pte;
133 pmd_t pmd;
134
135 pmd = mk_pmd_phys(page_to_phys(page), pgprot);
136 pte_val(pte) = pmd_val(pmd);
137 return pte;
138}
139
140static inline int huge_pte_write(pte_t pte)
141{
142 pmd_t pmd;
143
144 pmd_val(pmd) = pte_val(pte);
145 return pmd_write(pmd);
146}
147
148static inline int huge_pte_dirty(pte_t pte)
149{
150
151 return 0;
152}
153
154static inline pte_t huge_pte_mkwrite(pte_t pte)
155{
156 pmd_t pmd;
157
158 pmd_val(pmd) = pte_val(pte);
159 pte_val(pte) = pmd_val(pmd_mkwrite(pmd));
160 return pte;
161}
162
163static inline pte_t huge_pte_mkdirty(pte_t pte)
164{
165
166 return pte;
167}
168
169static inline pte_t huge_pte_modify(pte_t pte, pgprot_t newprot)
170{
171 pmd_t pmd;
172
173 pmd_val(pmd) = pte_val(pte);
174 pte_val(pte) = pmd_val(pmd_modify(pmd, newprot));
175 return pte;
176}
177
178static inline void huge_pte_clear(struct mm_struct *mm, unsigned long addr,
179 pte_t *ptep)
180{
181 pmd_clear((pmd_t *) ptep);
182}
183
184#endif
185
