Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1/*
2 * include/asm-s390/pgalloc.h
3 *
4 * S390 version
5 * Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
6 * Author(s): Hartmut Penner (hp@de.ibm.com)
7 * Martin Schwidefsky (schwidefsky@de.ibm.com)
8 *
9 * Derived from "include/asm-i386/pgalloc.h"
10 * Copyright (C) 1994 Linus Torvalds
11 */
12
13#ifndef _S390_PGALLOC_H
14#define _S390_PGALLOC_H
15
16#include <linux/threads.h>
17#include <linux/gfp.h>
18#include <linux/mm.h>
19
20unsigned long *crst_table_alloc(struct mm_struct *);
21void crst_table_free(struct mm_struct *, unsigned long *);
22
23unsigned long *page_table_alloc(struct mm_struct *, unsigned long);
24void page_table_free(struct mm_struct *, unsigned long *);
25#ifdef CONFIG_HAVE_RCU_TABLE_FREE
26void page_table_free_rcu(struct mmu_gather *, unsigned long *);
27void __tlb_remove_table(void *_table);
28#endif
29
30static inline void clear_table(unsigned long *s, unsigned long val, size_t n)
31{
32 typedef struct { char _[n]; } addrtype;
33
34 *s = val;
35 n = (n / 256) - 1;
36 asm volatile(
37#ifdef CONFIG_64BIT
38 " mvc 8(248,%0),0(%0)\n"
39#else
40 " mvc 4(252,%0),0(%0)\n"
41#endif
42 "0: mvc 256(256,%0),0(%0)\n"
43 " la %0,256(%0)\n"
44 " brct %1,0b\n"
45 : "+a" (s), "+d" (n), "=m" (*(addrtype *) s)
46 : "m" (*(addrtype *) s));
47}
48
49static inline void crst_table_init(unsigned long *crst, unsigned long entry)
50{
51 clear_table(crst, entry, sizeof(unsigned long)*2048);
52}
53
54#ifndef __s390x__
55
56static inline unsigned long pgd_entry_type(struct mm_struct *mm)
57{
58 return _SEGMENT_ENTRY_EMPTY;
59}
60
61#define pud_alloc_one(mm,address) ({ BUG(); ((pud_t *)2); })
62#define pud_free(mm, x) do { } while (0)
63
64#define pmd_alloc_one(mm,address) ({ BUG(); ((pmd_t *)2); })
65#define pmd_free(mm, x) do { } while (0)
66
67#define pgd_populate(mm, pgd, pud) BUG()
68#define pud_populate(mm, pud, pmd) BUG()
69
70#else /* __s390x__ */
71
72static inline unsigned long pgd_entry_type(struct mm_struct *mm)
73{
74 if (mm->context.asce_limit <= (1UL << 31))
75 return _SEGMENT_ENTRY_EMPTY;
76 if (mm->context.asce_limit <= (1UL << 42))
77 return _REGION3_ENTRY_EMPTY;
78 return _REGION2_ENTRY_EMPTY;
79}
80
81int crst_table_upgrade(struct mm_struct *, unsigned long limit);
82void crst_table_downgrade(struct mm_struct *, unsigned long limit);
83
84static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long address)
85{
86 unsigned long *table = crst_table_alloc(mm);
87 if (table)
88 crst_table_init(table, _REGION3_ENTRY_EMPTY);
89 return (pud_t *) table;
90}
91#define pud_free(mm, pud) crst_table_free(mm, (unsigned long *) pud)
92
93static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long vmaddr)
94{
95 unsigned long *table = crst_table_alloc(mm);
96 if (table)
97 crst_table_init(table, _SEGMENT_ENTRY_EMPTY);
98 return (pmd_t *) table;
99}
100#define pmd_free(mm, pmd) crst_table_free(mm, (unsigned long *) pmd)
101
102static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, pud_t *pud)
103{
104 pgd_val(*pgd) = _REGION2_ENTRY | __pa(pud);
105}
106
107static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
108{
109 pud_val(*pud) = _REGION3_ENTRY | __pa(pmd);
110}
111
112#endif /* __s390x__ */
113
114static inline pgd_t *pgd_alloc(struct mm_struct *mm)
115{
116 spin_lock_init(&mm->context.list_lock);
117 INIT_LIST_HEAD(&mm->context.pgtable_list);
118 INIT_LIST_HEAD(&mm->context.gmap_list);
119 return (pgd_t *) crst_table_alloc(mm);
120}
121#define pgd_free(mm, pgd) crst_table_free(mm, (unsigned long *) pgd)
122
123static inline void pmd_populate(struct mm_struct *mm,
124 pmd_t *pmd, pgtable_t pte)
125{
126 pmd_val(*pmd) = _SEGMENT_ENTRY + __pa(pte);
127}
128
129#define pmd_populate_kernel(mm, pmd, pte) pmd_populate(mm, pmd, pte)
130
131#define pmd_pgtable(pmd) \
132 (pgtable_t)(pmd_val(pmd) & -sizeof(pte_t)*PTRS_PER_PTE)
133
134/*
135 * page table entry allocation/free routines.
136 */
137#define pte_alloc_one_kernel(mm, vmaddr) ((pte_t *) page_table_alloc(mm, vmaddr))
138#define pte_alloc_one(mm, vmaddr) ((pte_t *) page_table_alloc(mm, vmaddr))
139
140#define pte_free_kernel(mm, pte) page_table_free(mm, (unsigned long *) pte)
141#define pte_free(mm, pte) page_table_free(mm, (unsigned long *) pte)
142
143extern void rcu_table_freelist_finish(void);
144
145#endif /* _S390_PGALLOC_H */