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1/*
2 * OpenRISC Linux
3 *
4 * Linux architectural port borrowing liberally from similar works of
5 * others. All original copyrights apply as per the original source
6 * declaration.
7 *
8 * OpenRISC implementation:
9 * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
10 * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
11 * et al.
12 *
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2 of the License, or
16 * (at your option) any later version.
17 */
18
19#ifndef __ASM_OPENRISC_PGALLOC_H
20#define __ASM_OPENRISC_PGALLOC_H
21
22#include <asm/page.h>
23#include <linux/threads.h>
24#include <linux/mm.h>
25#include <linux/memblock.h>
26#include <linux/bootmem.h>
27
28extern int mem_init_done;
29
30#define pmd_populate_kernel(mm, pmd, pte) \
31 set_pmd(pmd, __pmd(_KERNPG_TABLE + __pa(pte)))
32
33static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
34 struct page *pte)
35{
36 set_pmd(pmd, __pmd(_KERNPG_TABLE +
37 ((unsigned long)page_to_pfn(pte) <<
38 (unsigned long) PAGE_SHIFT)));
39}
40
41/*
42 * Allocate and free page tables.
43 */
44static inline pgd_t *pgd_alloc(struct mm_struct *mm)
45{
46 pgd_t *ret = (pgd_t *)__get_free_page(GFP_KERNEL);
47
48 if (ret) {
49 memset(ret, 0, USER_PTRS_PER_PGD * sizeof(pgd_t));
50 memcpy(ret + USER_PTRS_PER_PGD,
51 swapper_pg_dir + USER_PTRS_PER_PGD,
52 (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
53
54 }
55 return ret;
56}
57
58#if 0
59/* FIXME: This seems to be the preferred style, but we are using
60 * current_pgd (from mm->pgd) to load kernel pages so we need it
61 * initialized. This needs to be looked into.
62 */
63extern inline pgd_t *pgd_alloc(struct mm_struct *mm)
64{
65 return (pgd_t *)get_zeroed_page(GFP_KERNEL);
66}
67#endif
68
69static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
70{
71 free_page((unsigned long)pgd);
72}
73
74extern pte_t *pte_alloc_one_kernel(struct mm_struct *mm, unsigned long address);
75
76static inline struct page *pte_alloc_one(struct mm_struct *mm,
77 unsigned long address)
78{
79 struct page *pte;
80 pte = alloc_pages(GFP_KERNEL|__GFP_REPEAT, 0);
81 if (pte)
82 clear_page(page_address(pte));
83 return pte;
84}
85
86static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
87{
88 free_page((unsigned long)pte);
89}
90
91static inline void pte_free(struct mm_struct *mm, struct page *pte)
92{
93 __free_page(pte);
94}
95
96
97#define __pte_free_tlb(tlb, pte, addr) tlb_remove_page((tlb), (pte))
98#define pmd_pgtable(pmd) pmd_page(pmd)
99
100#define check_pgt_cache() do { } while (0)
101
102#endif
1/*
2 * OpenRISC Linux
3 *
4 * Linux architectural port borrowing liberally from similar works of
5 * others. All original copyrights apply as per the original source
6 * declaration.
7 *
8 * OpenRISC implementation:
9 * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
10 * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
11 * et al.
12 *
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2 of the License, or
16 * (at your option) any later version.
17 */
18
19#ifndef __ASM_OPENRISC_PGALLOC_H
20#define __ASM_OPENRISC_PGALLOC_H
21
22#include <asm/page.h>
23#include <linux/threads.h>
24#include <linux/mm.h>
25#include <linux/memblock.h>
26
27extern int mem_init_done;
28
29#define pmd_populate_kernel(mm, pmd, pte) \
30 set_pmd(pmd, __pmd(_KERNPG_TABLE + __pa(pte)))
31
32static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
33 struct page *pte)
34{
35 set_pmd(pmd, __pmd(_KERNPG_TABLE +
36 ((unsigned long)page_to_pfn(pte) <<
37 (unsigned long) PAGE_SHIFT)));
38}
39
40/*
41 * Allocate and free page tables.
42 */
43static inline pgd_t *pgd_alloc(struct mm_struct *mm)
44{
45 pgd_t *ret = (pgd_t *)__get_free_page(GFP_KERNEL);
46
47 if (ret) {
48 memset(ret, 0, USER_PTRS_PER_PGD * sizeof(pgd_t));
49 memcpy(ret + USER_PTRS_PER_PGD,
50 swapper_pg_dir + USER_PTRS_PER_PGD,
51 (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
52
53 }
54 return ret;
55}
56
57#if 0
58/* FIXME: This seems to be the preferred style, but we are using
59 * current_pgd (from mm->pgd) to load kernel pages so we need it
60 * initialized. This needs to be looked into.
61 */
62extern inline pgd_t *pgd_alloc(struct mm_struct *mm)
63{
64 return (pgd_t *)get_zeroed_page(GFP_KERNEL);
65}
66#endif
67
68static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
69{
70 free_page((unsigned long)pgd);
71}
72
73extern pte_t *pte_alloc_one_kernel(struct mm_struct *mm, unsigned long address);
74
75static inline struct page *pte_alloc_one(struct mm_struct *mm,
76 unsigned long address)
77{
78 struct page *pte;
79 pte = alloc_pages(GFP_KERNEL, 0);
80 if (!pte)
81 return NULL;
82 clear_page(page_address(pte));
83 if (!pgtable_page_ctor(pte)) {
84 __free_page(pte);
85 return NULL;
86 }
87 return pte;
88}
89
90static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
91{
92 free_page((unsigned long)pte);
93}
94
95static inline void pte_free(struct mm_struct *mm, struct page *pte)
96{
97 pgtable_page_dtor(pte);
98 __free_page(pte);
99}
100
101
102#define __pte_free_tlb(tlb, pte, addr) tlb_remove_page((tlb), (pte))
103#define pmd_pgtable(pmd) pmd_page(pmd)
104
105#define check_pgt_cache() do { } while (0)
106
107#endif