pgalloc.h revision f4815ac6c935b8e441fe12504d62e0e8ff7f7ce5 
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 *);
25void page_table_free_rcu(struct mmu_gather *, unsigned long *);
26
27static inline void clear_table(unsigned long *s, unsigned long val, size_t n)
28{
29	typedef struct { char _[n]; } addrtype;
30
31	*s = val;
32	n = (n / 256) - 1;
33	asm volatile(
34#ifdef CONFIG_64BIT
35		"	mvc	8(248,%0),0(%0)\n"
36#else
37		"	mvc	4(252,%0),0(%0)\n"
38#endif
39		"0:	mvc	256(256,%0),0(%0)\n"
40		"	la	%0,256(%0)\n"
41		"	brct	%1,0b\n"
42		: "+a" (s), "+d" (n), "=m" (*(addrtype *) s)
43		: "m" (*(addrtype *) s));
44}
45
46static inline void crst_table_init(unsigned long *crst, unsigned long entry)
47{
48	clear_table(crst, entry, sizeof(unsigned long)*2048);
49}
50
51#ifndef CONFIG_64BIT
52
53static inline unsigned long pgd_entry_type(struct mm_struct *mm)
54{
55	return _SEGMENT_ENTRY_EMPTY;
56}
57
58#define pud_alloc_one(mm,address)		({ BUG(); ((pud_t *)2); })
59#define pud_free(mm, x)				do { } while (0)
60
61#define pmd_alloc_one(mm,address)		({ BUG(); ((pmd_t *)2); })
62#define pmd_free(mm, x)				do { } while (0)
63
64#define pgd_populate(mm, pgd, pud)		BUG()
65#define pud_populate(mm, pud, pmd)		BUG()
66
67#else /* CONFIG_64BIT */
68
69static inline unsigned long pgd_entry_type(struct mm_struct *mm)
70{
71	if (mm->context.asce_limit <= (1UL << 31))
72		return _SEGMENT_ENTRY_EMPTY;
73	if (mm->context.asce_limit <= (1UL << 42))
74		return _REGION3_ENTRY_EMPTY;
75	return _REGION2_ENTRY_EMPTY;
76}
77
78int crst_table_upgrade(struct mm_struct *, unsigned long limit);
79void crst_table_downgrade(struct mm_struct *, unsigned long limit);
80
81static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long address)
82{
83	unsigned long *table = crst_table_alloc(mm);
84	if (table)
85		crst_table_init(table, _REGION3_ENTRY_EMPTY);
86	return (pud_t *) table;
87}
88#define pud_free(mm, pud) crst_table_free(mm, (unsigned long *) pud)
89
90static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long vmaddr)
91{
92	unsigned long *table = crst_table_alloc(mm);
93	if (table)
94		crst_table_init(table, _SEGMENT_ENTRY_EMPTY);
95	return (pmd_t *) table;
96}
97#define pmd_free(mm, pmd) crst_table_free(mm, (unsigned long *) pmd)
98
99static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, pud_t *pud)
100{
101	pgd_val(*pgd) = _REGION2_ENTRY | __pa(pud);
102}
103
104static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
105{
106	pud_val(*pud) = _REGION3_ENTRY | __pa(pmd);
107}
108
109#endif /* CONFIG_64BIT */
110
111static inline pgd_t *pgd_alloc(struct mm_struct *mm)
112{
113	spin_lock_init(&mm->context.list_lock);
114	INIT_LIST_HEAD(&mm->context.pgtable_list);
115	INIT_LIST_HEAD(&mm->context.gmap_list);
116	return (pgd_t *) crst_table_alloc(mm);
117}
118#define pgd_free(mm, pgd) crst_table_free(mm, (unsigned long *) pgd)
119
120static inline void pmd_populate(struct mm_struct *mm,
121				pmd_t *pmd, pgtable_t pte)
122{
123	pmd_val(*pmd) = _SEGMENT_ENTRY + __pa(pte);
124}
125
126#define pmd_populate_kernel(mm, pmd, pte) pmd_populate(mm, pmd, pte)
127
128#define pmd_pgtable(pmd) \
129	(pgtable_t)(pmd_val(pmd) & -sizeof(pte_t)*PTRS_PER_PTE)
130
131/*
132 * page table entry allocation/free routines.
133 */
134#define pte_alloc_one_kernel(mm, vmaddr) ((pte_t *) page_table_alloc(mm, vmaddr))
135#define pte_alloc_one(mm, vmaddr) ((pte_t *) page_table_alloc(mm, vmaddr))
136
137#define pte_free_kernel(mm, pte) page_table_free(mm, (unsigned long *) pte)
138#define pte_free(mm, pte) page_table_free(mm, (unsigned long *) pte)
139
140extern void rcu_table_freelist_finish(void);
141
142#endif /* _S390_PGALLOC_H */
143