mcf_pgalloc.h

 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 */