Linux kernel mirror (for testing)
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linux
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_alloc_one_fast(mm, address) ({ BUG(); ((pmd_t *)1); })
32#define pmd_alloc_one(mm, address) ({ BUG(); ((pmd_t *)2); })
33
34#define pmd_populate(mm, pmd, page) (pmd_val(*pmd) = \
35 (unsigned long)(page_address(page)))
36
37#define pmd_populate_kernel(mm, pmd, pte) (pmd_val(*pmd) = (unsigned long)(pte))
38
39#define pmd_pgtable(pmd) pmd_page(pmd)
40
41static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t page,
42 unsigned long address)
43{
44 pgtable_pte_page_dtor(page);
45 __free_page(page);
46}
47
48#define __pmd_free_tlb(tlb, pmd, address) do { } while (0)
49
50static inline struct page *pte_alloc_one(struct mm_struct *mm)
51{
52 struct page *page = alloc_pages(GFP_DMA, 0);
53 pte_t *pte;
54
55 if (!page)
56 return NULL;
57 if (!pgtable_pte_page_ctor(page)) {
58 __free_page(page);
59 return NULL;
60 }
61
62 pte = kmap(page);
63 if (pte) {
64 clear_page(pte);
65 __flush_page_to_ram(pte);
66 flush_tlb_kernel_page(pte);
67 nocache_page(pte);
68 }
69 kunmap(page);
70
71 return page;
72}
73
74static inline void pte_free(struct mm_struct *mm, struct page *page)
75{
76 pgtable_pte_page_dtor(page);
77 __free_page(page);
78}
79
80/*
81 * In our implementation, each pgd entry contains 1 pmd that is never allocated
82 * or freed. pgd_present is always 1, so this should never be called. -NL
83 */
84#define pmd_free(mm, pmd) BUG()
85
86static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
87{
88 free_page((unsigned long) pgd);
89}
90
91static inline pgd_t *pgd_alloc(struct mm_struct *mm)
92{
93 pgd_t *new_pgd;
94
95 new_pgd = (pgd_t *)__get_free_page(GFP_DMA | __GFP_NOWARN);
96 if (!new_pgd)
97 return NULL;
98 memcpy(new_pgd, swapper_pg_dir, PAGE_SIZE);
99 memset(new_pgd, 0, PAGE_OFFSET >> PGDIR_SHIFT);
100 return new_pgd;
101}
102
103#define pgd_populate(mm, pmd, pte) BUG()
104
105#endif /* M68K_MCF_PGALLOC_H */