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 PGD_SIZE (PTRS_PER_PGD * sizeof(pgd_t))
19
20#if CONFIG_PGTABLE_LEVELS > 2
21
22static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr)
23{
24 gfp_t gfp = GFP_PGTABLE_USER;
25 struct page *page;
26
27 if (mm == &init_mm)
28 gfp = GFP_PGTABLE_KERNEL;
29
30 page = alloc_page(gfp);
31 if (!page)
32 return NULL;
33 if (!pgtable_pmd_page_ctor(page)) {
34 __free_page(page);
35 return NULL;
36 }
37 return page_address(page);
38}
39
40static inline void pmd_free(struct mm_struct *mm, pmd_t *pmdp)
41{
42 BUG_ON((unsigned long)pmdp & (PAGE_SIZE-1));
43 pgtable_pmd_page_dtor(virt_to_page(pmdp));
44 free_page((unsigned long)pmdp);
45}
46
47static inline void __pud_populate(pud_t *pudp, phys_addr_t pmdp, pudval_t prot)
48{
49 set_pud(pudp, __pud(__phys_to_pud_val(pmdp) | prot));
50}
51
52static inline void pud_populate(struct mm_struct *mm, pud_t *pudp, pmd_t *pmdp)
53{
54 __pud_populate(pudp, __pa(pmdp), PMD_TYPE_TABLE);
55}
56#else
57static inline void __pud_populate(pud_t *pudp, phys_addr_t pmdp, pudval_t prot)
58{
59 BUILD_BUG();
60}
61#endif /* CONFIG_PGTABLE_LEVELS > 2 */
62
63#if CONFIG_PGTABLE_LEVELS > 3
64
65static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr)
66{
67 return (pud_t *)__get_free_page(GFP_PGTABLE_USER);
68}
69
70static inline void pud_free(struct mm_struct *mm, pud_t *pudp)
71{
72 BUG_ON((unsigned long)pudp & (PAGE_SIZE-1));
73 free_page((unsigned long)pudp);
74}
75
76static inline void __pgd_populate(pgd_t *pgdp, phys_addr_t pudp, pgdval_t prot)
77{
78 set_pgd(pgdp, __pgd(__phys_to_pgd_val(pudp) | prot));
79}
80
81static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgdp, pud_t *pudp)
82{
83 __pgd_populate(pgdp, __pa(pudp), PUD_TYPE_TABLE);
84}
85#else
86static inline void __pgd_populate(pgd_t *pgdp, phys_addr_t pudp, pgdval_t prot)
87{
88 BUILD_BUG();
89}
90#endif /* CONFIG_PGTABLE_LEVELS > 3 */
91
92extern pgd_t *pgd_alloc(struct mm_struct *mm);
93extern void pgd_free(struct mm_struct *mm, pgd_t *pgdp);
94
95static inline void __pmd_populate(pmd_t *pmdp, phys_addr_t ptep,
96 pmdval_t prot)
97{
98 set_pmd(pmdp, __pmd(__phys_to_pmd_val(ptep) | prot));
99}
100
101/*
102 * Populate the pmdp entry with a pointer to the pte. This pmd is part
103 * of the mm address space.
104 */
105static inline void
106pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmdp, pte_t *ptep)
107{
108 /*
109 * The pmd must be loaded with the physical address of the PTE table
110 */
111 __pmd_populate(pmdp, __pa(ptep), PMD_TYPE_TABLE);
112}
113
114static inline void
115pmd_populate(struct mm_struct *mm, pmd_t *pmdp, pgtable_t ptep)
116{
117 __pmd_populate(pmdp, page_to_phys(ptep), PMD_TYPE_TABLE);
118}
119#define pmd_pgtable(pmd) pmd_page(pmd)
120
121#endif