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
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
|
/*
* linux/include/asm-arm/pgtable.h
*
* Copyright (C) 2000 Russell King
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#ifndef _ASMARM_PGTABLE_H
#define _ASMARM_PGTABLE_H
#include <linux/config.h>
#include <asm/arch/memory.h>
#include <asm/proc-fns.h>
/*
* PMD_SHIFT determines the size of the area a second-level page table can map
* PGDIR_SHIFT determines what a third-level page table entry can map
*/
#define PMD_SHIFT 20
#define PGDIR_SHIFT 20
#define LIBRARY_TEXT_START 0x0c000000
#ifndef __ASSEMBLY__
extern void __pte_error(const char *file, int line, unsigned long val);
extern void __pmd_error(const char *file, int line, unsigned long val);
extern void __pgd_error(const char *file, int line, unsigned long val);
#define pte_ERROR(pte) __pte_error(__FILE__, __LINE__, pte_val(pte))
#define pmd_ERROR(pmd) __pmd_error(__FILE__, __LINE__, pmd_val(pmd))
#define pgd_ERROR(pgd) __pgd_error(__FILE__, __LINE__, pgd_val(pgd))
#endif /* !__ASSEMBLY__ */
#define PMD_SIZE (1UL << PMD_SHIFT)
#define PMD_MASK (~(PMD_SIZE-1))
#define PGDIR_SIZE (1UL << PGDIR_SHIFT)
#define PGDIR_MASK (~(PGDIR_SIZE-1))
#define FIRST_USER_PGD_NR 1
#define USER_PTRS_PER_PGD ((TASK_SIZE/PGDIR_SIZE) - FIRST_USER_PGD_NR)
/*
* The table below defines the page protection levels that we insert into our
* Linux page table version. These get translated into the best that the
* architecture can perform. Note that on most ARM hardware:
* 1) We cannot do execute protection
* 2) If we could do execute protection, then read is implied
* 3) write implies read permissions
*/
#define __P000 PAGE_NONE
#define __P001 PAGE_READONLY
#define __P010 PAGE_COPY
#define __P011 PAGE_COPY
#define __P100 PAGE_READONLY
#define __P101 PAGE_READONLY
#define __P110 PAGE_COPY
#define __P111 PAGE_COPY
#define __S000 PAGE_NONE
#define __S001 PAGE_READONLY
#define __S010 PAGE_SHARED
#define __S011 PAGE_SHARED
#define __S100 PAGE_READONLY
#define __S101 PAGE_READONLY
#define __S110 PAGE_SHARED
#define __S111 PAGE_SHARED
#ifndef __ASSEMBLY__
/*
* ZERO_PAGE is a global shared page that is always zero: used
* for zero-mapped memory areas etc..
*/
extern struct page *empty_zero_page;
#define ZERO_PAGE(vaddr) (empty_zero_page)
/*
* Handling allocation failures during page table setup.
*/
extern void __handle_bad_pmd(pmd_t *pmd);
extern void __handle_bad_pmd_kernel(pmd_t *pmd);
#define pte_none(pte) (!pte_val(pte))
#define pte_clear(ptep) set_pte((ptep), __pte(0))
#ifndef CONFIG_DISCONTIGMEM
#define pte_page(x) (mem_map + (pte_val((x)) >> PAGE_SHIFT) - \
(PHYS_OFFSET >> PAGE_SHIFT))
#else
/*
* I'm not happy with this - we needlessly convert a physical address
* to a virtual one, and then immediately back to a physical address,
* which, if __va and __pa are expensive causes twice the expense for
* zero gain. --rmk
*/
#define pte_page(x) (virt_to_page(__va(pte_val((x)))))
#endif
#define pmd_none(pmd) (!pmd_val(pmd))
#define pmd_clear(pmdp) set_pmd(pmdp, __pmd(0))
/*
* Permanent address of a page. We never have highmem, so this is trivial.
*/
#define page_address(page) ((page)->virtual)
#define pages_to_mb(x) ((x) >> (20 - PAGE_SHIFT))
/*
* Conversion functions: convert a page and protection to a page entry,
* and a page entry and page directory to the page they refer to.
*/
extern __inline__ pte_t mk_pte_phys(unsigned long physpage, pgprot_t pgprot)
{
pte_t pte;
pte_val(pte) = physpage | pgprot_val(pgprot);
return pte;
}
#define mk_pte(page,pgprot) \
({ \
pte_t __pte; \
pte_val(__pte) = __pa(page_address(page)) + \
pgprot_val(pgprot); \
__pte; \
})
/*
* The "pgd_xxx()" functions here are trivial for a folded two-level
* setup: the pgd is never bad, and a pmd always exists (as it's folded
* into the pgd entry)
*/
#define pgd_none(pgd) (0)
#define pgd_bad(pgd) (0)
#define pgd_present(pgd) (1)
#define pgd_clear(pgdp)
#define page_pte_prot(page,prot) mk_pte(page, prot)
#define page_pte(page) mk_pte(page, __pgprot(0))
/* to find an entry in a page-table-directory */
#define pgd_index(addr) ((addr) >> PGDIR_SHIFT)
#define __pgd_offset(addr) pgd_index(addr)
#define pgd_offset(mm, addr) ((mm)->pgd+pgd_index(addr))
/* to find an entry in a kernel page-table-directory */
#define pgd_offset_k(addr) pgd_offset(&init_mm, addr)
/* Find an entry in the second-level page table.. */
#define pmd_offset(dir, addr) ((pmd_t *)(dir))
/* Find an entry in the third-level page table.. */
#define __pte_offset(addr) (((addr) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
#define pte_offset(dir, addr) ((pte_t *)pmd_page(*(dir)) + __pte_offset(addr))
#include <asm/proc/pgtable.h>
extern __inline__ pte_t pte_modify(pte_t pte, pgprot_t newprot)
{
pte_val(pte) = (pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot);
return pte;
}
extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
#define update_mmu_cache(vma,address,pte) do { } while (0)
/* Encode and decode a swap entry.
*
* We support up to 32GB of swap on 4k machines
*/
#define SWP_TYPE(x) (((x).val >> 2) & 0x7f)
#define SWP_OFFSET(x) ((x).val >> 9)
#define SWP_ENTRY(type,offset) ((swp_entry_t) { ((type) << 2) | ((offset) << 9) })
#define pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
#define swp_entry_to_pte(swp) ((pte_t) { (swp).val })
#define module_map vmalloc
#define module_unmap vfree
/* Needs to be defined here and not in linux/mm.h, as it is arch dependent */
/* FIXME: this is not correct */
#define kern_addr_valid(addr) (1)
#define io_remap_page_range remap_page_range
#endif /* !__ASSEMBLY__ */
#endif /* _ASMARM_PGTABLE_H */
|
