aboutsummaryrefslogtreecommitdiff
path: root/include/asm-s390/pgalloc.h
blob: 56c8a6c80e2e18183b6bc4c11c0b53771bcee9f5 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
/*
 *  include/asm-s390/pgalloc.h
 *
 *  S390 version
 *    Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
 *    Author(s): Hartmut Penner (hp@de.ibm.com)
 *               Martin Schwidefsky (schwidefsky@de.ibm.com)
 *
 *  Derived from "include/asm-i386/pgalloc.h"
 *    Copyright (C) 1994  Linus Torvalds
 */

#ifndef _S390_PGALLOC_H
#define _S390_PGALLOC_H

#include <linux/threads.h>
#include <linux/gfp.h>
#include <linux/mm.h>

#define check_pgt_cache()	do {} while (0)

extern void diag10(unsigned long addr);

/*
 * Page allocation orders.
 */
#ifndef __s390x__
# define PTE_ALLOC_ORDER	0
# define PMD_ALLOC_ORDER	0
# define PGD_ALLOC_ORDER	1
#else /* __s390x__ */
# define PTE_ALLOC_ORDER	0
# define PMD_ALLOC_ORDER	2
# define PGD_ALLOC_ORDER	2
#endif /* __s390x__ */

/*
 * Allocate and free page tables. The xxx_kernel() versions are
 * used to allocate a kernel page table - this turns on ASN bits
 * if any.
 */

static inline pgd_t *pgd_alloc(struct mm_struct *mm)
{
	pgd_t *pgd = (pgd_t *) __get_free_pages(GFP_KERNEL, PGD_ALLOC_ORDER);
	int i;

	if (!pgd)
		return NULL;
	if (s390_noexec) {
		pgd_t *shadow_pgd = (pgd_t *)
			__get_free_pages(GFP_KERNEL, PGD_ALLOC_ORDER);
		struct page *page = virt_to_page(pgd);

		if (!shadow_pgd) {
			free_pages((unsigned long) pgd, PGD_ALLOC_ORDER);
			return NULL;
		}
		page->lru.next = (void *) shadow_pgd;
	}
	for (i = 0; i < PTRS_PER_PGD; i++)
#ifndef __s390x__
		pmd_clear(pmd_offset(pgd + i, i*PGDIR_SIZE));
#else
		pgd_clear(pgd + i);
#endif
	return pgd;
}

static inline void pgd_free(pgd_t *pgd)
{
	pgd_t *shadow_pgd = get_shadow_pgd(pgd);

	if (shadow_pgd)
		free_pages((unsigned long) shadow_pgd, PGD_ALLOC_ORDER);
	free_pages((unsigned long) pgd, PGD_ALLOC_ORDER);
}

#ifndef __s390x__
/*
 * page middle directory allocation/free routines.
 * We use pmd cache only on s390x, so these are dummy routines. This
 * code never triggers because the pgd will always be present.
 */
#define pmd_alloc_one(mm,address)       ({ BUG(); ((pmd_t *)2); })
#define pmd_free(x)                     do { } while (0)
#define __pmd_free_tlb(tlb,x)		do { } while (0)
#define pgd_populate(mm, pmd, pte)      BUG()
#define pgd_populate_kernel(mm, pmd, pte)	BUG()
#else /* __s390x__ */
static inline pmd_t * pmd_alloc_one(struct mm_struct *mm, unsigned long vmaddr)
{
	pmd_t *pmd = (pmd_t *) __get_free_pages(GFP_KERNEL, PMD_ALLOC_ORDER);
	int i;

	if (!pmd)
		return NULL;
	if (s390_noexec) {
		pmd_t *shadow_pmd = (pmd_t *)
			__get_free_pages(GFP_KERNEL, PMD_ALLOC_ORDER);
		struct page *page = virt_to_page(pmd);

		if (!shadow_pmd) {
			free_pages((unsigned long) pmd, PMD_ALLOC_ORDER);
			return NULL;
		}
		page->lru.next = (void *) shadow_pmd;
	}
	for (i=0; i < PTRS_PER_PMD; i++)
		pmd_clear(pmd + i);
	return pmd;
}

static inline void pmd_free (pmd_t *pmd)
{
	pmd_t *shadow_pmd = get_shadow_pmd(pmd);

	if (shadow_pmd)
		free_pages((unsigned long) shadow_pmd, PMD_ALLOC_ORDER);
	free_pages((unsigned long) pmd, PMD_ALLOC_ORDER);
}

#define __pmd_free_tlb(tlb,pmd)			\
	do {					\
		tlb_flush_mmu(tlb, 0, 0);	\
		pmd_free(pmd);			\
	 } while (0)

static inline void
pgd_populate_kernel(struct mm_struct *mm, pgd_t *pgd, pmd_t *pmd)
{
	pgd_val(*pgd) = _PGD_ENTRY | __pa(pmd);
}

static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, pmd_t *pmd)
{
	pgd_t *shadow_pgd = get_shadow_pgd(pgd);
	pmd_t *shadow_pmd = get_shadow_pmd(pmd);

	if (shadow_pgd && shadow_pmd)
		pgd_populate_kernel(mm, shadow_pgd, shadow_pmd);
	pgd_populate_kernel(mm, pgd, pmd);
}

#endif /* __s390x__ */

static inline void 
pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd, pte_t *pte)
{
#ifndef __s390x__
	pmd_val(pmd[0]) = _PAGE_TABLE + __pa(pte);
	pmd_val(pmd[1]) = _PAGE_TABLE + __pa(pte+256);
	pmd_val(pmd[2]) = _PAGE_TABLE + __pa(pte+512);
	pmd_val(pmd[3]) = _PAGE_TABLE + __pa(pte+768);
#else /* __s390x__ */
	pmd_val(*pmd) = _PMD_ENTRY + __pa(pte);
	pmd_val1(*pmd) = _PMD_ENTRY + __pa(pte+256);
#endif /* __s390x__ */
}

static inline void
pmd_populate(struct mm_struct *mm, pmd_t *pmd, struct page *page)
{
	pte_t *pte = (pte_t *)page_to_phys(page);
	pmd_t *shadow_pmd = get_shadow_pmd(pmd);
	pte_t *shadow_pte = get_shadow_pte(pte);

	pmd_populate_kernel(mm, pmd, pte);
	if (shadow_pmd && shadow_pte)
		pmd_populate_kernel(mm, shadow_pmd, shadow_pte);
}

/*
 * page table entry allocation/free routines.
 */
static inline pte_t *
pte_alloc_one_kernel(struct mm_struct *mm, unsigned long vmaddr)
{
	pte_t *pte = (pte_t *) __get_free_page(GFP_KERNEL|__GFP_REPEAT);
	int i;

	if (!pte)
		return NULL;
	if (s390_noexec) {
		pte_t *shadow_pte = (pte_t *)
			__get_free_page(GFP_KERNEL|__GFP_REPEAT);
		struct page *page = virt_to_page(pte);

		if (!shadow_pte) {
			free_page((unsigned long) pte);
			return NULL;
		}
		page->lru.next = (void *) shadow_pte;
	}
	for (i=0; i < PTRS_PER_PTE; i++) {
		pte_clear(mm, vmaddr, pte + i);
		vmaddr += PAGE_SIZE;
	}
	return pte;
}

static inline struct page *
pte_alloc_one(struct mm_struct *mm, unsigned long vmaddr)
{
	pte_t *pte = pte_alloc_one_kernel(mm, vmaddr);
	if (pte)
		return virt_to_page(pte);
	return NULL;
}

static inline void pte_free_kernel(pte_t *pte)
{
	pte_t *shadow_pte = get_shadow_pte(pte);

	if (shadow_pte)
		free_page((unsigned long) shadow_pte);
	free_page((unsigned long) pte);
}

static inline void pte_free(struct page *pte)
{
	struct page *shadow_page = get_shadow_page(pte);

	if (shadow_page)
		__free_page(shadow_page);
	__free_page(pte);
}

#define __pte_free_tlb(tlb, pte)					\
({									\
	struct mmu_gather *__tlb = (tlb);				\
	struct page *__pte = (pte);					\
	struct page *shadow_page = get_shadow_page(__pte);		\
	if (shadow_page)						\
		tlb_remove_page(__tlb, shadow_page);			\
	tlb_remove_page(__tlb, __pte);					\
})

#endif /* _S390_PGALLOC_H */