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