1 /* SPDX-License-Identifier: GPL-2.0 */
4 * Copyright IBM Corp. 1999, 2000
8 * Derived from "include/asm-i386/pgalloc.h"
9 * Copyright (C) 1994 Linus Torvalds
12 #ifndef _S390_PGALLOC_H
13 #define _S390_PGALLOC_H
15 #include <linux/threads.h>
16 #include <linux/string.h>
17 #include <linux/gfp.h>
20 #define CRST_ALLOC_ORDER 2
22 unsigned long *crst_table_alloc(struct mm_struct *);
23 void crst_table_free(struct mm_struct *, unsigned long *);
25 unsigned long *page_table_alloc(struct mm_struct *);
26 struct ptdesc *page_table_alloc_pgste(struct mm_struct *mm);
27 void page_table_free(struct mm_struct *, unsigned long *);
28 void page_table_free_pgste(struct ptdesc *ptdesc);
29 extern int page_table_allocate_pgste;
31 static inline void crst_table_init(unsigned long *crst, unsigned long entry)
33 memset64((u64 *)crst, entry, _CRST_ENTRIES);
36 int crst_table_upgrade(struct mm_struct *mm, unsigned long limit);
38 static inline unsigned long check_asce_limit(struct mm_struct *mm, unsigned long addr,
43 if (addr + len > mm->context.asce_limit &&
44 addr + len <= TASK_SIZE) {
45 rc = crst_table_upgrade(mm, addr + len);
47 return (unsigned long) rc;
52 static inline p4d_t *p4d_alloc_one(struct mm_struct *mm, unsigned long address)
54 unsigned long *table = crst_table_alloc(mm);
57 crst_table_init(table, _REGION2_ENTRY_EMPTY);
58 return (p4d_t *) table;
61 static inline void p4d_free(struct mm_struct *mm, p4d_t *p4d)
63 if (!mm_p4d_folded(mm))
64 crst_table_free(mm, (unsigned long *) p4d);
67 static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long address)
69 unsigned long *table = crst_table_alloc(mm);
71 crst_table_init(table, _REGION3_ENTRY_EMPTY);
72 return (pud_t *) table;
75 static inline void pud_free(struct mm_struct *mm, pud_t *pud)
77 if (!mm_pud_folded(mm))
78 crst_table_free(mm, (unsigned long *) pud);
81 static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long vmaddr)
83 unsigned long *table = crst_table_alloc(mm);
87 crst_table_init(table, _SEGMENT_ENTRY_EMPTY);
88 if (!pagetable_pmd_ctor(virt_to_ptdesc(table))) {
89 crst_table_free(mm, table);
92 return (pmd_t *) table;
95 static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
97 if (mm_pmd_folded(mm))
99 pagetable_pmd_dtor(virt_to_ptdesc(pmd));
100 crst_table_free(mm, (unsigned long *) pmd);
103 static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, p4d_t *p4d)
105 set_pgd(pgd, __pgd(_REGION1_ENTRY | __pa(p4d)));
108 static inline void p4d_populate(struct mm_struct *mm, p4d_t *p4d, pud_t *pud)
110 set_p4d(p4d, __p4d(_REGION2_ENTRY | __pa(pud)));
113 static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
115 set_pud(pud, __pud(_REGION3_ENTRY | __pa(pmd)));
118 static inline pgd_t *pgd_alloc(struct mm_struct *mm)
120 return (pgd_t *) crst_table_alloc(mm);
123 static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
125 crst_table_free(mm, (unsigned long *) pgd);
128 static inline void pmd_populate(struct mm_struct *mm,
129 pmd_t *pmd, pgtable_t pte)
131 set_pmd(pmd, __pmd(_SEGMENT_ENTRY | __pa(pte)));
134 #define pmd_populate_kernel(mm, pmd, pte) pmd_populate(mm, pmd, pte)
137 * page table entry allocation/free routines.
139 #define pte_alloc_one_kernel(mm) ((pte_t *)page_table_alloc(mm))
140 #define pte_alloc_one(mm) ((pte_t *)page_table_alloc(mm))
142 #define pte_free_kernel(mm, pte) page_table_free(mm, (unsigned long *) pte)
143 #define pte_free(mm, pte) page_table_free(mm, (unsigned long *) pte)
145 /* arch use pte_free_defer() implementation in arch/s390/mm/pgalloc.c */
146 #define pte_free_defer pte_free_defer
147 void pte_free_defer(struct mm_struct *mm, pgtable_t pgtable);
149 void vmem_map_init(void);
150 void *vmem_crst_alloc(unsigned long val);
151 pte_t *vmem_pte_alloc(void);
153 unsigned long base_asce_alloc(unsigned long addr, unsigned long num_pages);
154 void base_asce_free(unsigned long asce);
156 #endif /* _S390_PGALLOC_H */