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