Linux kernel mirror (for testing)
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1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef M68K_MCF_PGALLOC_H
3#define M68K_MCF_PGALLOC_H
4
5#include <asm/tlb.h>
6#include <asm/tlbflush.h>
7
8static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
9{
10 pagetable_dtor_free(virt_to_ptdesc(pte));
11}
12
13extern const char bad_pmd_string[];
14
15static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm)
16{
17 struct ptdesc *ptdesc = pagetable_alloc((GFP_DMA | __GFP_ZERO) &
18 ~__GFP_HIGHMEM, 0);
19
20 if (!ptdesc)
21 return NULL;
22 if (!pagetable_pte_ctor(mm, ptdesc)) {
23 pagetable_free(ptdesc);
24 return NULL;
25 }
26
27 return ptdesc_address(ptdesc);
28}
29
30extern inline pmd_t *pmd_alloc_kernel(pgd_t *pgd, unsigned long address)
31{
32 return (pmd_t *) pgd;
33}
34
35#define pmd_populate(mm, pmd, pte) (pmd_val(*pmd) = (unsigned long)(pte))
36
37#define pmd_populate_kernel pmd_populate
38
39static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t pgtable,
40 unsigned long address)
41{
42 struct ptdesc *ptdesc = virt_to_ptdesc(pgtable);
43
44 pagetable_dtor(ptdesc);
45 pagetable_free(ptdesc);
46}
47
48static inline pgtable_t pte_alloc_one(struct mm_struct *mm)
49{
50 struct ptdesc *ptdesc = pagetable_alloc(GFP_DMA | __GFP_ZERO, 0);
51 pte_t *pte;
52
53 if (!ptdesc)
54 return NULL;
55 if (!pagetable_pte_ctor(mm, ptdesc)) {
56 pagetable_free(ptdesc);
57 return NULL;
58 }
59
60 pte = ptdesc_address(ptdesc);
61 return pte;
62}
63
64static inline void pte_free(struct mm_struct *mm, pgtable_t pgtable)
65{
66 struct ptdesc *ptdesc = virt_to_ptdesc(pgtable);
67
68 pagetable_dtor(ptdesc);
69 pagetable_free(ptdesc);
70}
71
72/*
73 * In our implementation, each pgd entry contains 1 pmd that is never allocated
74 * or freed. pgd_present is always 1, so this should never be called. -NL
75 */
76#define pmd_free(mm, pmd) BUG()
77
78static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
79{
80 pagetable_dtor_free(virt_to_ptdesc(pgd));
81}
82
83static inline pgd_t *pgd_alloc(struct mm_struct *mm)
84{
85 pgd_t *new_pgd;
86 struct ptdesc *ptdesc = pagetable_alloc((GFP_DMA | __GFP_NOWARN) &
87 ~__GFP_HIGHMEM, 0);
88
89 if (!ptdesc)
90 return NULL;
91 pagetable_pgd_ctor(ptdesc);
92 new_pgd = ptdesc_address(ptdesc);
93
94 memcpy(new_pgd, swapper_pg_dir, PTRS_PER_PGD * sizeof(pgd_t));
95 memset(new_pgd, 0, PAGE_OFFSET >> PGDIR_SHIFT);
96 return new_pgd;
97}
98
99#endif /* M68K_MCF_PGALLOC_H */