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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
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);
74
75static inline struct page *pte_alloc_one(struct mm_struct *mm)
76{
77 struct page *pte;
78 pte = alloc_pages(GFP_KERNEL, 0);
79 if (!pte)
80 return NULL;
81 clear_page(page_address(pte));
82 if (!pgtable_page_ctor(pte)) {
83 __free_page(pte);
84 return NULL;
85 }
86 return pte;
87}
88
89static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
90{
91 free_page((unsigned long)pte);
92}
93
94static inline void pte_free(struct mm_struct *mm, struct page *pte)
95{
96 pgtable_page_dtor(pte);
97 __free_page(pte);
98}
99
100#define __pte_free_tlb(tlb, pte, addr) \
101do { \
102 pgtable_page_dtor(pte); \
103 tlb_remove_page((tlb), (pte)); \
104} while (0)
105
106#define pmd_pgtable(pmd) pmd_page(pmd)
107
108#define check_pgt_cache() do { } while (0)
109
110#endif