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pgalloc.h
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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 
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  if (!PageHighMem(pte)) {
56  void *page = page_address(pte);
57  clean_dcache_area(page, PTRS_PER_PTE * sizeof(pte_t));
58  }
59  pgtable_page_ctor(pte);
60  }
61 
62  return pte;
63 }
64 
65 /*
66  * Free one PTE table.
67  */
68 static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
69 {
70  if (pte)
71  free_page((unsigned long)pte);
72 }
73 
74 static inline void pte_free(struct mm_struct *mm, pgtable_t pte)
75 {
76  pgtable_page_dtor(pte);
77  __free_page(pte);
78 }
79 
80 static inline void __pmd_populate(pmd_t *pmdp, unsigned long pmdval)
81 {
82  set_pmd(pmdp, __pmd(pmdval));
83  flush_pmd_entry(pmdp);
84 }
85 
86 /*
87  * Populate the pmdp entry with a pointer to the pte. This pmd is part
88  * of the mm address space.
89  */
90 static inline void
91 pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmdp, pte_t *ptep)
92 {
93  unsigned long pte_ptr = (unsigned long)ptep;
94 
95  /*
96  * The pmd must be loaded with the physical
97  * address of the PTE table
98  */
99  __pmd_populate(pmdp, __pa(pte_ptr) | _PAGE_KERNEL_TABLE);
100 }
101 
102 static inline void
103 pmd_populate(struct mm_struct *mm, pmd_t *pmdp, pgtable_t ptep)
104 {
105  __pmd_populate(pmdp,
107 }
108 #define pmd_pgtable(pmd) pmd_page(pmd)
109 
110 #endif