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