Linux kernel mirror (for testing)
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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_4LEVEL_H
8#define __UM_PGTABLE_4LEVEL_H
9
10#include <asm-generic/pgtable-nop4d.h>
11
12/* PGDIR_SHIFT determines what a fourth-level page table entry can map */
13
14#define PGDIR_SHIFT 39
15#define PGDIR_SIZE (1UL << PGDIR_SHIFT)
16#define PGDIR_MASK (~(PGDIR_SIZE-1))
17
18/* PUD_SHIFT determines the size of the area a third-level page table can
19 * map
20 */
21
22#define PUD_SHIFT 30
23#define PUD_SIZE (1UL << PUD_SHIFT)
24#define PUD_MASK (~(PUD_SIZE-1))
25
26/* PMD_SHIFT determines the size of the area a second-level page table can
27 * map
28 */
29
30#define PMD_SHIFT 21
31#define PMD_SIZE (1UL << PMD_SHIFT)
32#define PMD_MASK (~(PMD_SIZE-1))
33
34/*
35 * entries per page directory level
36 */
37
38#define PTRS_PER_PTE 512
39#define PTRS_PER_PMD 512
40#define PTRS_PER_PUD 512
41#define PTRS_PER_PGD 512
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 pud_ERROR(e) \
52 printk("%s:%d: bad pud %p(%016lx).\n", __FILE__, __LINE__, &(e), \
53 pud_val(e))
54#define pgd_ERROR(e) \
55 printk("%s:%d: bad pgd %p(%016lx).\n", __FILE__, __LINE__, &(e), \
56 pgd_val(e))
57
58#define pud_none(x) (!(pud_val(x) & ~_PAGE_NEEDSYNC))
59#define pud_bad(x) ((pud_val(x) & (~PAGE_MASK & ~_PAGE_USER)) != _KERNPG_TABLE)
60#define pud_present(x) (pud_val(x) & _PAGE_PRESENT)
61#define pud_populate(mm, pud, pmd) \
62 set_pud(pud, __pud(_PAGE_TABLE + __pa(pmd)))
63
64#define set_pud(pudptr, pudval) (*(pudptr) = (pudval))
65
66#define p4d_none(x) (!(p4d_val(x) & ~_PAGE_NEEDSYNC))
67#define p4d_bad(x) ((p4d_val(x) & (~PAGE_MASK & ~_PAGE_USER)) != _KERNPG_TABLE)
68#define p4d_present(x) (p4d_val(x) & _PAGE_PRESENT)
69#define p4d_populate(mm, p4d, pud) \
70 set_p4d(p4d, __p4d(_PAGE_TABLE + __pa(pud)))
71
72#define set_p4d(p4dptr, p4dval) (*(p4dptr) = (p4dval))
73
74
75static inline int pgd_needsync(pgd_t pgd)
76{
77 return pgd_val(pgd) & _PAGE_NEEDSYNC;
78}
79
80static inline void pgd_mkuptodate(pgd_t pgd) { pgd_val(pgd) &= ~_PAGE_NEEDSYNC; }
81
82#define set_pmd(pmdptr, pmdval) (*(pmdptr) = (pmdval))
83
84static inline void pud_clear (pud_t *pud)
85{
86 set_pud(pud, __pud(_PAGE_NEEDSYNC));
87}
88
89static inline void p4d_clear (p4d_t *p4d)
90{
91 set_p4d(p4d, __p4d(_PAGE_NEEDSYNC));
92}
93
94#define pud_page(pud) phys_to_page(pud_val(pud) & PAGE_MASK)
95#define pud_pgtable(pud) ((pmd_t *) __va(pud_val(pud) & PAGE_MASK))
96
97#define p4d_page(p4d) phys_to_page(p4d_val(p4d) & PAGE_MASK)
98#define p4d_pgtable(p4d) ((pud_t *) __va(p4d_val(p4d) & PAGE_MASK))
99
100static inline unsigned long pte_pfn(pte_t pte)
101{
102 return phys_to_pfn(pte_val(pte));
103}
104
105static inline pmd_t pfn_pmd(unsigned long page_nr, pgprot_t pgprot)
106{
107 return __pmd((page_nr << PAGE_SHIFT) | pgprot_val(pgprot));
108}
109
110#endif