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
31 #define PGALLOC_GFP (GFP_KERNEL | __GFP_NOTRACK | __GFP_REPEAT | __GFP_ZERO)
32
33 /*
34 * Allocate one PTE table.
35 */
36 static inline pte_t *
37 pte_alloc_one_kernel(struct mm_struct *mm, unsigned long addr)
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
49 pte_alloc_one(struct mm_struct *mm, unsigned long addr)
50 {
51 struct page *pte;
52
53 pte = alloc_pages(PGALLOC_GFP, 0);
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);
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
113
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