1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3 * Copyright 2003 PathScale Inc
4 * Derived from include/asm-i386/pgtable.h
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 #ifdef CONFIG_64BIT
15 #define PGDIR_SHIFT 30
16 #else
17 #define PGDIR_SHIFT 31
18 #endif
19 #define PGDIR_SIZE (1UL << PGDIR_SHIFT)
20 #define PGDIR_MASK (~(PGDIR_SIZE-1))
21
22 /* PMD_SHIFT determines the size of the area a second-level page table can
23 * map
24 */
25
26 #define PMD_SHIFT 21
27 #define PMD_SIZE (1UL << PMD_SHIFT)
28 #define PMD_MASK (~(PMD_SIZE-1))
29
30 /*
31 * entries per page directory level
32 */
33
34 #define PTRS_PER_PTE 512
35 #ifdef CONFIG_64BIT
36 #define PTRS_PER_PMD 512
37 #define PTRS_PER_PGD 512
38 #else
39 #define PTRS_PER_PMD 1024
40 #define PTRS_PER_PGD 1024
41 #endif
42
43 #define USER_PTRS_PER_PGD ((TASK_SIZE + (PGDIR_SIZE - 1)) / PGDIR_SIZE)
44
45 #define pte_ERROR(e) \
46 printk("%s:%d: bad pte %p(%016lx).\n", __FILE__, __LINE__, &(e), \
47 pte_val(e))
48 #define pmd_ERROR(e) \
49 printk("%s:%d: bad pmd %p(%016lx).\n", __FILE__, __LINE__, &(e), \
50 pmd_val(e))
51 #define pgd_ERROR(e) \
52 printk("%s:%d: bad pgd %p(%016lx).\n", __FILE__, __LINE__, &(e), \
53 pgd_val(e))
54
55 #define pud_none(x) (!(pud_val(x) & ~_PAGE_NEWPAGE))
56 #define pud_bad(x) ((pud_val(x) & (~PAGE_MASK & ~_PAGE_USER)) != _KERNPG_TABLE)
57 #define pud_present(x) (pud_val(x) & _PAGE_PRESENT)
58 #define pud_populate(mm, pud, pmd) \
59 set_pud(pud, __pud(_PAGE_TABLE + __pa(pmd)))
60
61 #define set_pud(pudptr, pudval) (*(pudptr) = (pudval))
62
63 static inline int pgd_newpage(pgd_t pgd)
64 {
65 return(pgd_val(pgd) & _PAGE_NEWPAGE);
66 }
67
68 static inline void pgd_mkuptodate(pgd_t pgd) { pgd_val(pgd) &= ~_PAGE_NEWPAGE; }
69
70 #define set_pmd(pmdptr, pmdval) (*(pmdptr) = (pmdval))
71
72 static inline void pud_clear (pud_t *pud)
73 {
74 set_pud(pud, __pud(_PAGE_NEWPAGE));
75 }
76
77 #define pud_page(pud) phys_to_page(pud_val(pud) & PAGE_MASK)
78 #define pud_pgtable(pud) ((pmd_t *) __va(pud_val(pud) & PAGE_MASK))
79
80 static inline unsigned long pte_pfn(pte_t pte)
81 {
82 return phys_to_pfn(pte_val(pte));
83 }
84
85 static inline pte_t pfn_pte(unsigned long page_nr, pgprot_t pgprot)
86 {
87 pte_t pte;
88 phys_t phys = pfn_to_phys(page_nr);
89
90 pte_set_val(pte, phys, pgprot);
91 return pte;
92 }
93
94 static inline pmd_t pfn_pmd(unsigned long page_nr, pgprot_t pgprot)
95 {
96 return __pmd((page_nr << PAGE_SHIFT) | pgprot_val(pgprot));
97 }
98
99 #endif
100
101
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