1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
|
/*
* Copyright 2003 PathScale Inc
* Derived from include/asm-i386/pgtable.h
* Licensed under the GPL
*/
#ifndef __UM_PGTABLE_3LEVEL_H
#define __UM_PGTABLE_3LEVEL_H
#include <asm-generic/pgtable-nopud.h>
/* PGDIR_SHIFT determines what a third-level page table entry can map */
#ifdef CONFIG_64BIT
#define PGDIR_SHIFT 30
#else
#define PGDIR_SHIFT 31
#endif
#define PGDIR_SIZE (1UL << PGDIR_SHIFT)
#define PGDIR_MASK (~(PGDIR_SIZE-1))
/* PMD_SHIFT determines the size of the area a second-level page table can
* map
*/
#define PMD_SHIFT 21
#define PMD_SIZE (1UL << PMD_SHIFT)
#define PMD_MASK (~(PMD_SIZE-1))
/*
* entries per page directory level
*/
#define PTRS_PER_PTE 512
#ifdef CONFIG_64BIT
#define PTRS_PER_PMD 512
#define PTRS_PER_PGD 512
#else
#define PTRS_PER_PMD 1024
#define PTRS_PER_PGD 1024
#endif
#define USER_PTRS_PER_PGD ((TASK_SIZE + (PGDIR_SIZE - 1)) / PGDIR_SIZE)
#define FIRST_USER_ADDRESS 0
#define pte_ERROR(e) \
printk("%s:%d: bad pte %p(%016lx).\n", __FILE__, __LINE__, &(e), \
pte_val(e))
#define pmd_ERROR(e) \
printk("%s:%d: bad pmd %p(%016lx).\n", __FILE__, __LINE__, &(e), \
pmd_val(e))
#define pgd_ERROR(e) \
printk("%s:%d: bad pgd %p(%016lx).\n", __FILE__, __LINE__, &(e), \
pgd_val(e))
#define pud_none(x) (!(pud_val(x) & ~_PAGE_NEWPAGE))
#define pud_bad(x) ((pud_val(x) & (~PAGE_MASK & ~_PAGE_USER)) != _KERNPG_TABLE)
#define pud_present(x) (pud_val(x) & _PAGE_PRESENT)
#define pud_populate(mm, pud, pmd) \
set_pud(pud, __pud(_PAGE_TABLE + __pa(pmd)))
#ifdef CONFIG_64BIT
#define set_pud(pudptr, pudval) set_64bit((phys_t *) (pudptr), pud_val(pudval))
#else
#define set_pud(pudptr, pudval) (*(pudptr) = (pudval))
#endif
static inline int pgd_newpage(pgd_t pgd)
{
return(pgd_val(pgd) & _PAGE_NEWPAGE);
}
static inline void pgd_mkuptodate(pgd_t pgd) { pgd_val(pgd) &= ~_PAGE_NEWPAGE; }
#ifdef CONFIG_64BIT
#define set_pmd(pmdptr, pmdval) set_64bit((phys_t *) (pmdptr), pmd_val(pmdval))
#else
#define set_pmd(pmdptr, pmdval) (*(pmdptr) = (pmdval))
#endif
struct mm_struct;
extern pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address);
static inline void pud_clear (pud_t *pud)
{
set_pud(pud, __pud(_PAGE_NEWPAGE));
}
#define pud_page(pud) phys_to_page(pud_val(pud) & PAGE_MASK)
#define pud_page_vaddr(pud) ((unsigned long) __va(pud_val(pud) & PAGE_MASK))
/* Find an entry in the second-level page table.. */
#define pmd_offset(pud, address) ((pmd_t *) pud_page_vaddr(*(pud)) + \
pmd_index(address))
static inline unsigned long pte_pfn(pte_t pte)
{
return phys_to_pfn(pte_val(pte));
}
static inline pte_t pfn_pte(pfn_t page_nr, pgprot_t pgprot)
{
pte_t pte;
phys_t phys = pfn_to_phys(page_nr);
pte_set_val(pte, phys, pgprot);
return pte;
}
static inline pmd_t pfn_pmd(pfn_t page_nr, pgprot_t pgprot)
{
return __pmd((page_nr << PAGE_SHIFT) | pgprot_val(pgprot));
}
/*
* Bits 0 through 3 are taken in the low part of the pte,
* put the 32 bits of offset into the high part.
*/
#define PTE_FILE_MAX_BITS 32
#ifdef CONFIG_64BIT
#define pte_to_pgoff(p) ((p).pte >> 32)
#define pgoff_to_pte(off) ((pte_t) { ((off) << 32) | _PAGE_FILE })
#else
#define pte_to_pgoff(pte) ((pte).pte_high)
#define pgoff_to_pte(off) ((pte_t) { _PAGE_FILE, (off) })
#endif
#endif
|
