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
27 extern int mem_init_done;
28
29 #define pmd_populate_kernel(mm, pmd, pte) \
30 set_pmd(pmd, __pmd(_KERNPG_TABLE + __pa(pte)))
31
pmd_populate(struct mm_struct * mm,pmd_t * pmd,struct page * pte)32 static 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 */
pgd_alloc(struct mm_struct * mm)43 static 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 */
62 extern inline pgd_t *pgd_alloc(struct mm_struct *mm)
63 {
64 return (pgd_t *)get_zeroed_page(GFP_KERNEL);
65 }
66 #endif
67
pgd_free(struct mm_struct * mm,pgd_t * pgd)68 static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
69 {
70 free_page((unsigned long)pgd);
71 }
72
73 extern pte_t *pte_alloc_one_kernel(struct mm_struct *mm, unsigned long address);
74
pte_alloc_one(struct mm_struct * mm,unsigned long address)75 static 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
pte_free_kernel(struct mm_struct * mm,pte_t * pte)90 static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
91 {
92 free_page((unsigned long)pte);
93 }
94
pte_free(struct mm_struct * mm,struct page * pte)95 static 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
108