1 /* SPDX-License-Identifier: GPL-2.0 */
3 * IBM System z Huge TLB Page Support for Kernel.
5 * Copyright IBM Corp. 2008
6 * Author(s): Gerald Schaefer <gerald.schaefer@de.ibm.com>
9 #ifndef _ASM_S390_HUGETLB_H
10 #define _ASM_S390_HUGETLB_H
13 #include <asm/pgtable.h>
15 #define hugetlb_free_pgd_range free_pgd_range
16 #define hugepages_supported() (MACHINE_HAS_EDAT1)
18 void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
19 pte_t *ptep, pte_t pte);
20 pte_t huge_ptep_get(pte_t *ptep);
21 pte_t huge_ptep_get_and_clear(struct mm_struct *mm,
22 unsigned long addr, pte_t *ptep);
25 * If the arch doesn't supply something else, assume that hugepage
26 * size aligned regions are ok without further preparation.
28 static inline int prepare_hugepage_range(struct file *file,
29 unsigned long addr, unsigned long len)
31 if (len & ~HPAGE_MASK)
33 if (addr & ~HPAGE_MASK)
38 static inline void arch_clear_hugepage_flags(struct page *page)
40 clear_bit(PG_arch_1, &page->flags);
43 static inline void huge_pte_clear(struct mm_struct *mm, unsigned long addr,
44 pte_t *ptep, unsigned long sz)
46 if ((pte_val(*ptep) & _REGION_ENTRY_TYPE_MASK) == _REGION_ENTRY_TYPE_R3)
47 pte_val(*ptep) = _REGION3_ENTRY_EMPTY;
49 pte_val(*ptep) = _SEGMENT_ENTRY_EMPTY;
52 static inline void huge_ptep_clear_flush(struct vm_area_struct *vma,
53 unsigned long address, pte_t *ptep)
55 huge_ptep_get_and_clear(vma->vm_mm, address, ptep);
58 static inline int huge_ptep_set_access_flags(struct vm_area_struct *vma,
59 unsigned long addr, pte_t *ptep,
62 int changed = !pte_same(huge_ptep_get(ptep), pte);
64 huge_ptep_get_and_clear(vma->vm_mm, addr, ptep);
65 set_huge_pte_at(vma->vm_mm, addr, ptep, pte);
70 static inline void huge_ptep_set_wrprotect(struct mm_struct *mm,
71 unsigned long addr, pte_t *ptep)
73 pte_t pte = huge_ptep_get_and_clear(mm, addr, ptep);
74 set_huge_pte_at(mm, addr, ptep, pte_wrprotect(pte));
77 static inline pte_t mk_huge_pte(struct page *page, pgprot_t pgprot)
79 return mk_pte(page, pgprot);
82 static inline int huge_pte_none(pte_t pte)
87 static inline int huge_pte_write(pte_t pte)
89 return pte_write(pte);
92 static inline int huge_pte_dirty(pte_t pte)
94 return pte_dirty(pte);
97 static inline pte_t huge_pte_mkwrite(pte_t pte)
99 return pte_mkwrite(pte);
102 static inline pte_t huge_pte_mkdirty(pte_t pte)
104 return pte_mkdirty(pte);
107 static inline pte_t huge_pte_wrprotect(pte_t pte)
109 return pte_wrprotect(pte);
112 static inline pte_t huge_pte_modify(pte_t pte, pgprot_t newprot)
114 return pte_modify(pte, newprot);
117 static inline bool gigantic_page_runtime_supported(void)
122 #endif /* _ASM_S390_HUGETLB_H */