Linux kernel mirror (for testing)
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1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * Based on arch/arm/include/asm/pgalloc.h
4 *
5 * Copyright (C) 2000-2001 Russell King
6 * Copyright (C) 2012 ARM Ltd.
7 */
8#ifndef __ASM_PGALLOC_H
9#define __ASM_PGALLOC_H
10
11#include <asm/pgtable-hwdef.h>
12#include <asm/processor.h>
13#include <asm/cacheflush.h>
14#include <asm/tlbflush.h>
15
16#include <asm-generic/pgalloc.h> /* for pte_{alloc,free}_one */
17
18#define check_pgt_cache() do { } while (0)
19
20#define PGD_SIZE (PTRS_PER_PGD * sizeof(pgd_t))
21
22#if CONFIG_PGTABLE_LEVELS > 2
23
24static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr)
25{
26 gfp_t gfp = GFP_PGTABLE_USER;
27 struct page *page;
28
29 if (mm == &init_mm)
30 gfp = GFP_PGTABLE_KERNEL;
31
32 page = alloc_page(gfp);
33 if (!page)
34 return NULL;
35 if (!pgtable_pmd_page_ctor(page)) {
36 __free_page(page);
37 return NULL;
38 }
39 return page_address(page);
40}
41
42static inline void pmd_free(struct mm_struct *mm, pmd_t *pmdp)
43{
44 BUG_ON((unsigned long)pmdp & (PAGE_SIZE-1));
45 pgtable_pmd_page_dtor(virt_to_page(pmdp));
46 free_page((unsigned long)pmdp);
47}
48
49static inline void __pud_populate(pud_t *pudp, phys_addr_t pmdp, pudval_t prot)
50{
51 set_pud(pudp, __pud(__phys_to_pud_val(pmdp) | prot));
52}
53
54static inline void pud_populate(struct mm_struct *mm, pud_t *pudp, pmd_t *pmdp)
55{
56 __pud_populate(pudp, __pa(pmdp), PMD_TYPE_TABLE);
57}
58#else
59static inline void __pud_populate(pud_t *pudp, phys_addr_t pmdp, pudval_t prot)
60{
61 BUILD_BUG();
62}
63#endif /* CONFIG_PGTABLE_LEVELS > 2 */
64
65#if CONFIG_PGTABLE_LEVELS > 3
66
67static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr)
68{
69 return (pud_t *)__get_free_page(GFP_PGTABLE_USER);
70}
71
72static inline void pud_free(struct mm_struct *mm, pud_t *pudp)
73{
74 BUG_ON((unsigned long)pudp & (PAGE_SIZE-1));
75 free_page((unsigned long)pudp);
76}
77
78static inline void __pgd_populate(pgd_t *pgdp, phys_addr_t pudp, pgdval_t prot)
79{
80 set_pgd(pgdp, __pgd(__phys_to_pgd_val(pudp) | prot));
81}
82
83static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgdp, pud_t *pudp)
84{
85 __pgd_populate(pgdp, __pa(pudp), PUD_TYPE_TABLE);
86}
87#else
88static inline void __pgd_populate(pgd_t *pgdp, phys_addr_t pudp, pgdval_t prot)
89{
90 BUILD_BUG();
91}
92#endif /* CONFIG_PGTABLE_LEVELS > 3 */
93
94extern pgd_t *pgd_alloc(struct mm_struct *mm);
95extern void pgd_free(struct mm_struct *mm, pgd_t *pgdp);
96
97static inline void __pmd_populate(pmd_t *pmdp, phys_addr_t ptep,
98 pmdval_t prot)
99{
100 set_pmd(pmdp, __pmd(__phys_to_pmd_val(ptep) | prot));
101}
102
103/*
104 * Populate the pmdp entry with a pointer to the pte. This pmd is part
105 * of the mm address space.
106 */
107static inline void
108pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmdp, pte_t *ptep)
109{
110 /*
111 * The pmd must be loaded with the physical address of the PTE table
112 */
113 __pmd_populate(pmdp, __pa(ptep), PMD_TYPE_TABLE);
114}
115
116static inline void
117pmd_populate(struct mm_struct *mm, pmd_t *pmdp, pgtable_t ptep)
118{
119 __pmd_populate(pmdp, page_to_phys(ptep), PMD_TYPE_TABLE);
120}
121#define pmd_pgtable(pmd) pmd_page(pmd)
122
123#endif