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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
20#define check_pgt_cache() do {} while (0)
21
22extern void diag10(unsigned long addr);
23
24/*
25 * Page allocation orders.
26 */
27#ifndef __s390x__
28# define PTE_ALLOC_ORDER 0
29# define PMD_ALLOC_ORDER 0
30# define PGD_ALLOC_ORDER 1
31#else /* __s390x__ */
32# define PTE_ALLOC_ORDER 0
33# define PMD_ALLOC_ORDER 2
34# define PGD_ALLOC_ORDER 2
35#endif /* __s390x__ */
36
37/*
38 * Allocate and free page tables. The xxx_kernel() versions are
39 * used to allocate a kernel page table - this turns on ASN bits
40 * if any.
41 */
42
43static inline pgd_t *pgd_alloc(struct mm_struct *mm)
44{
45 pgd_t *pgd = (pgd_t *) __get_free_pages(GFP_KERNEL, PGD_ALLOC_ORDER);
46 int i;
47
48 if (!pgd)
49 return NULL;
50 for (i = 0; i < PTRS_PER_PGD; i++)
51#ifndef __s390x__
52 pmd_clear(pmd_offset(pgd + i, i*PGDIR_SIZE));
53#else
54 pgd_clear(pgd + i);
55#endif
56 return pgd;
57}
58
59static inline void pgd_free(pgd_t *pgd)
60{
61 free_pages((unsigned long) pgd, PGD_ALLOC_ORDER);
62}
63
64#ifndef __s390x__
65/*
66 * page middle directory allocation/free routines.
67 * We use pmd cache only on s390x, so these are dummy routines. This
68 * code never triggers because the pgd will always be present.
69 */
70#define pmd_alloc_one(mm,address) ({ BUG(); ((pmd_t *)2); })
71#define pmd_free(x) do { } while (0)
72#define __pmd_free_tlb(tlb,x) do { } while (0)
73#define pgd_populate(mm, pmd, pte) BUG()
74#else /* __s390x__ */
75static inline pmd_t * pmd_alloc_one(struct mm_struct *mm, unsigned long vmaddr)
76{
77 pmd_t *pmd = (pmd_t *) __get_free_pages(GFP_KERNEL, PMD_ALLOC_ORDER);
78 int i;
79
80 if (!pmd)
81 return NULL;
82 for (i=0; i < PTRS_PER_PMD; i++)
83 pmd_clear(pmd + i);
84 return pmd;
85}
86
87static inline void pmd_free (pmd_t *pmd)
88{
89 free_pages((unsigned long) pmd, PMD_ALLOC_ORDER);
90}
91
92#define __pmd_free_tlb(tlb,pmd) \
93 do { \
94 tlb_flush_mmu(tlb, 0, 0); \
95 pmd_free(pmd); \
96 } while (0)
97
98static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, pmd_t *pmd)
99{
100 pgd_val(*pgd) = _PGD_ENTRY | __pa(pmd);
101}
102
103#endif /* __s390x__ */
104
105static inline void
106pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd, pte_t *pte)
107{
108#ifndef __s390x__
109 pmd_val(pmd[0]) = _PAGE_TABLE + __pa(pte);
110 pmd_val(pmd[1]) = _PAGE_TABLE + __pa(pte+256);
111 pmd_val(pmd[2]) = _PAGE_TABLE + __pa(pte+512);
112 pmd_val(pmd[3]) = _PAGE_TABLE + __pa(pte+768);
113#else /* __s390x__ */
114 pmd_val(*pmd) = _PMD_ENTRY + __pa(pte);
115 pmd_val1(*pmd) = _PMD_ENTRY + __pa(pte+256);
116#endif /* __s390x__ */
117}
118
119static inline void
120pmd_populate(struct mm_struct *mm, pmd_t *pmd, struct page *page)
121{
122 pmd_populate_kernel(mm, pmd, (pte_t *)page_to_phys(page));
123}
124
125/*
126 * page table entry allocation/free routines.
127 */
128static inline pte_t *
129pte_alloc_one_kernel(struct mm_struct *mm, unsigned long vmaddr)
130{
131 pte_t *pte = (pte_t *) __get_free_page(GFP_KERNEL|__GFP_REPEAT);
132 int i;
133
134 if (!pte)
135 return NULL;
136 for (i=0; i < PTRS_PER_PTE; i++) {
137 pte_clear(mm, vmaddr, pte + i);
138 vmaddr += PAGE_SIZE;
139 }
140 return pte;
141}
142
143static inline struct page *
144pte_alloc_one(struct mm_struct *mm, unsigned long vmaddr)
145{
146 pte_t *pte = pte_alloc_one_kernel(mm, vmaddr);
147 if (pte)
148 return virt_to_page(pte);
149 return NULL;
150}
151
152static inline void pte_free_kernel(pte_t *pte)
153{
154 free_page((unsigned long) pte);
155}
156
157static inline void pte_free(struct page *pte)
158{
159 __free_page(pte);
160}
161
162#define __pte_free_tlb(tlb,pte) tlb_remove_page(tlb,pte)
163
164#endif /* _S390_PGALLOC_H */