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56372b0b G |
1 | /* |
2 | * linux/arch/unicore32/include/asm/pgalloc.h | |
3 | * | |
4 | * Code specific to PKUnity SoC and UniCore ISA | |
5 | * | |
6 | * Copyright (C) 2001-2010 GUAN Xue-tao | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License version 2 as | |
10 | * published by the Free Software Foundation. | |
11 | */ | |
12 | #ifndef __UNICORE_PGALLOC_H__ | |
13 | #define __UNICORE_PGALLOC_H__ | |
14 | ||
15 | #include <asm/pgtable-hwdef.h> | |
16 | #include <asm/processor.h> | |
17 | #include <asm/cacheflush.h> | |
18 | #include <asm/tlbflush.h> | |
19 | ||
20 | #define check_pgt_cache() do { } while (0) | |
21 | ||
22 | #define _PAGE_USER_TABLE (PMD_TYPE_TABLE | PMD_PRESENT) | |
23 | #define _PAGE_KERNEL_TABLE (PMD_TYPE_TABLE | PMD_PRESENT) | |
24 | ||
25 | extern pgd_t *get_pgd_slow(struct mm_struct *mm); | |
26 | extern void free_pgd_slow(struct mm_struct *mm, pgd_t *pgd); | |
27 | ||
28 | #define pgd_alloc(mm) get_pgd_slow(mm) | |
29 | #define pgd_free(mm, pgd) free_pgd_slow(mm, pgd) | |
30 | ||
75f296d9 | 31 | #define PGALLOC_GFP (GFP_KERNEL | __GFP_ZERO) |
56372b0b G |
32 | |
33 | /* | |
34 | * Allocate one PTE table. | |
35 | */ | |
36 | static inline pte_t * | |
4cf58924 | 37 | pte_alloc_one_kernel(struct mm_struct *mm) |
56372b0b G |
38 | { |
39 | pte_t *pte; | |
40 | ||
41 | pte = (pte_t *)__get_free_page(PGALLOC_GFP); | |
42 | if (pte) | |
43 | clean_dcache_area(pte, PTRS_PER_PTE * sizeof(pte_t)); | |
44 | ||
45 | return pte; | |
46 | } | |
47 | ||
48 | static inline pgtable_t | |
4cf58924 | 49 | pte_alloc_one(struct mm_struct *mm) |
56372b0b G |
50 | { |
51 | struct page *pte; | |
52 | ||
53 | pte = alloc_pages(PGALLOC_GFP, 0); | |
e90bedbb KS |
54 | if (!pte) |
55 | return NULL; | |
56 | if (!PageHighMem(pte)) { | |
57 | void *page = page_address(pte); | |
58 | clean_dcache_area(page, PTRS_PER_PTE * sizeof(pte_t)); | |
59 | } | |
60 | if (!pgtable_page_ctor(pte)) { | |
61 | __free_page(pte); | |
56372b0b G |
62 | } |
63 | ||
64 | return pte; | |
65 | } | |
66 | ||
67 | /* | |
68 | * Free one PTE table. | |
69 | */ | |
70 | static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte) | |
71 | { | |
72 | if (pte) | |
73 | free_page((unsigned long)pte); | |
74 | } | |
75 | ||
76 | static inline void pte_free(struct mm_struct *mm, pgtable_t pte) | |
77 | { | |
78 | pgtable_page_dtor(pte); | |
79 | __free_page(pte); | |
80 | } | |
81 | ||
82 | static inline void __pmd_populate(pmd_t *pmdp, unsigned long pmdval) | |
83 | { | |
84 | set_pmd(pmdp, __pmd(pmdval)); | |
85 | flush_pmd_entry(pmdp); | |
86 | } | |
87 | ||
88 | /* | |
89 | * Populate the pmdp entry with a pointer to the pte. This pmd is part | |
90 | * of the mm address space. | |
91 | */ | |
92 | static inline void | |
93 | pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmdp, pte_t *ptep) | |
94 | { | |
95 | unsigned long pte_ptr = (unsigned long)ptep; | |
96 | ||
97 | /* | |
98 | * The pmd must be loaded with the physical | |
99 | * address of the PTE table | |
100 | */ | |
101 | __pmd_populate(pmdp, __pa(pte_ptr) | _PAGE_KERNEL_TABLE); | |
102 | } | |
103 | ||
104 | static inline void | |
105 | pmd_populate(struct mm_struct *mm, pmd_t *pmdp, pgtable_t ptep) | |
106 | { | |
107 | __pmd_populate(pmdp, | |
108 | page_to_pfn(ptep) << PAGE_SHIFT | _PAGE_USER_TABLE); | |
109 | } | |
110 | #define pmd_pgtable(pmd) pmd_page(pmd) | |
111 | ||
112 | #endif |