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
 8extern inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
 9{
10	free_page((unsigned long) pte);
11}
12
13extern const char bad_pmd_string[];
14
15extern inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm)
16{
17	unsigned long page = __get_free_page(GFP_DMA);
18
19	if (!page)
20		return NULL;
21
22	memset((void *)page, 0, PAGE_SIZE);
23	return (pte_t *) (page);
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
35#define pmd_pgtable(pmd) pfn_to_virt(pmd_val(pmd) >> PAGE_SHIFT)
36
37static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t pgtable,
38				  unsigned long address)
39{
40	struct page *page = virt_to_page(pgtable);
41
42	pgtable_pte_page_dtor(page);
43	__free_page(page);
44}
45
46static inline pgtable_t pte_alloc_one(struct mm_struct *mm)
47{
48	struct page *page = alloc_pages(GFP_DMA, 0);
49	pte_t *pte;
50
51	if (!page)
52		return NULL;
53	if (!pgtable_pte_page_ctor(page)) {
54		__free_page(page);
55		return NULL;
56	}
57
58	pte = page_address(page);
59	clear_page(pte);
60
61	return pte;
62}
63
64static inline void pte_free(struct mm_struct *mm, pgtable_t pgtable)
65{
66	struct page *page = virt_to_page(pgtable);
67
68	pgtable_pte_page_dtor(page);
69	__free_page(page);
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	free_page((unsigned long) pgd);
81}
82
83static inline pgd_t *pgd_alloc(struct mm_struct *mm)
84{
85	pgd_t *new_pgd;
86
87	new_pgd = (pgd_t *)__get_free_page(GFP_DMA | __GFP_NOWARN);
88	if (!new_pgd)
89		return NULL;
90	memcpy(new_pgd, swapper_pg_dir, PTRS_PER_PGD * sizeof(pgd_t));
91	memset(new_pgd, 0, PAGE_OFFSET >> PGDIR_SHIFT);
92	return new_pgd;
93}
94
95#endif /* M68K_MCF_PGALLOC_H */