Commit | Line | Data |
---|---|---|
61e85e36 JB |
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 | ||
28 | extern int mem_init_done; | |
29 | ||
30 | #define pmd_populate_kernel(mm, pmd, pte) \ | |
31 | set_pmd(pmd, __pmd(_KERNPG_TABLE + __pa(pte))) | |
32 | ||
33 | static 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 | */ | |
44 | static 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 | */ | |
63 | extern inline pgd_t *pgd_alloc(struct mm_struct *mm) | |
64 | { | |
65 | return (pgd_t *)get_zeroed_page(GFP_KERNEL); | |
66 | } | |
67 | #endif | |
68 | ||
69 | static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd) | |
70 | { | |
71 | free_page((unsigned long)pgd); | |
72 | } | |
73 | ||
74 | extern pte_t *pte_alloc_one_kernel(struct mm_struct *mm, unsigned long address); | |
75 | ||
76 | static inline struct page *pte_alloc_one(struct mm_struct *mm, | |
77 | unsigned long address) | |
78 | { | |
79 | struct page *pte; | |
32d6bd90 | 80 | pte = alloc_pages(GFP_KERNEL, 0); |
b3d59c6e KS |
81 | if (!pte) |
82 | return NULL; | |
83 | clear_page(page_address(pte)); | |
84 | if (!pgtable_page_ctor(pte)) { | |
85 | __free_page(pte); | |
86 | return NULL; | |
87 | } | |
61e85e36 JB |
88 | return pte; |
89 | } | |
90 | ||
91 | static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte) | |
92 | { | |
93 | free_page((unsigned long)pte); | |
94 | } | |
95 | ||
96 | static inline void pte_free(struct mm_struct *mm, struct page *pte) | |
97 | { | |
b3d59c6e | 98 | pgtable_page_dtor(pte); |
61e85e36 JB |
99 | __free_page(pte); |
100 | } | |
101 | ||
102 | ||
103 | #define __pte_free_tlb(tlb, pte, addr) tlb_remove_page((tlb), (pte)) | |
104 | #define pmd_pgtable(pmd) pmd_page(pmd) | |
105 | ||
106 | #define check_pgt_cache() do { } while (0) | |
107 | ||
108 | #endif |