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_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
23	return ptdesc_address(ptdesc);
24}
25
26extern inline pmd_t *pmd_alloc_kernel(pgd_t *pgd, unsigned long address)
27{
28	return (pmd_t *) pgd;
29}
30
31#define pmd_populate(mm, pmd, pte) (pmd_val(*pmd) = (unsigned long)(pte))
32
33#define pmd_populate_kernel pmd_populate
34
35static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t pgtable,
36				  unsigned long address)
37{
38	struct ptdesc *ptdesc = virt_to_ptdesc(pgtable);
39
40	pagetable_pte_dtor(ptdesc);
41	pagetable_free(ptdesc);
42}
43
44static inline pgtable_t pte_alloc_one(struct mm_struct *mm)
45{
46	struct ptdesc *ptdesc = pagetable_alloc(GFP_DMA | __GFP_ZERO, 0);
47	pte_t *pte;
48
49	if (!ptdesc)
50		return NULL;
51	if (!pagetable_pte_ctor(ptdesc)) {
52		pagetable_free(ptdesc);
53		return NULL;
54	}
55
56	pte = ptdesc_address(ptdesc);
57	return pte;
58}
59
60static inline void pte_free(struct mm_struct *mm, pgtable_t pgtable)
61{
62	struct ptdesc *ptdesc = virt_to_ptdesc(pgtable);
63
64	pagetable_pte_dtor(ptdesc);
65	pagetable_free(ptdesc);
66}
67
68/*
69 * In our implementation, each pgd entry contains 1 pmd that is never allocated
70 * or freed.  pgd_present is always 1, so this should never be called. -NL
71 */
72#define pmd_free(mm, pmd) BUG()
73
74static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
75{
76	pagetable_free(virt_to_ptdesc(pgd));
77}
78
79static inline pgd_t *pgd_alloc(struct mm_struct *mm)
80{
81	pgd_t *new_pgd;
82	struct ptdesc *ptdesc = pagetable_alloc((GFP_DMA | __GFP_NOWARN) &
83			~__GFP_HIGHMEM, 0);
84
85	if (!ptdesc)
86		return NULL;
87	new_pgd = ptdesc_address(ptdesc);
88
89	memcpy(new_pgd, swapper_pg_dir, PTRS_PER_PGD * sizeof(pgd_t));
90	memset(new_pgd, 0, PAGE_OFFSET >> PGDIR_SHIFT);
91	return new_pgd;
92}
93
94#endif /* M68K_MCF_PGALLOC_H */