Linux kernel mirror (for testing)
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1/* SPDX-License-Identifier: GPL-2.0 */
2/* sun3_pgalloc.h --
3 * reorganization around 2.3.39, routines moved from sun3_pgtable.h
4 *
5 *
6 * 02/27/2002 -- Modified to support "highpte" implementation in 2.5.5 (Sam)
7 *
8 * moved 1/26/2000 Sam Creasey
9 */
10
11#ifndef _SUN3_PGALLOC_H
12#define _SUN3_PGALLOC_H
13
14#include <asm/tlb.h>
15
16extern const char bad_pmd_string[];
17
18#define pmd_alloc_one(mm,address) ({ BUG(); ((pmd_t *)2); })
19
20
21static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
22{
23 free_page((unsigned long) pte);
24}
25
26static inline void pte_free(struct mm_struct *mm, pgtable_t page)
27{
28 pgtable_page_dtor(page);
29 __free_page(page);
30}
31
32#define __pte_free_tlb(tlb,pte,addr) \
33do { \
34 pgtable_page_dtor(pte); \
35 tlb_remove_page((tlb), pte); \
36} while (0)
37
38static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm)
39{
40 unsigned long page = __get_free_page(GFP_KERNEL);
41
42 if (!page)
43 return NULL;
44
45 memset((void *)page, 0, PAGE_SIZE);
46 return (pte_t *) (page);
47}
48
49static inline pgtable_t pte_alloc_one(struct mm_struct *mm)
50{
51 struct page *page = alloc_pages(GFP_KERNEL, 0);
52
53 if (page == NULL)
54 return NULL;
55
56 clear_highpage(page);
57 if (!pgtable_page_ctor(page)) {
58 __free_page(page);
59 return NULL;
60 }
61 return page;
62
63}
64
65static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd, pte_t *pte)
66{
67 pmd_val(*pmd) = __pa((unsigned long)pte);
68}
69
70static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd, pgtable_t page)
71{
72 pmd_val(*pmd) = __pa((unsigned long)page_address(page));
73}
74#define pmd_pgtable(pmd) pmd_page(pmd)
75
76/*
77 * allocating and freeing a pmd is trivial: the 1-entry pmd is
78 * inside the pgd, so has no extra memory associated with it.
79 */
80#define pmd_free(mm, x) do { } while (0)
81#define __pmd_free_tlb(tlb, x, addr) do { } while (0)
82
83static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
84{
85 free_page((unsigned long) pgd);
86}
87
88static inline pgd_t * pgd_alloc(struct mm_struct *mm)
89{
90 pgd_t *new_pgd;
91
92 new_pgd = (pgd_t *)get_zeroed_page(GFP_KERNEL);
93 memcpy(new_pgd, swapper_pg_dir, PAGE_SIZE);
94 memset(new_pgd, 0, (PAGE_OFFSET >> PGDIR_SHIFT));
95 return new_pgd;
96}
97
98#define pgd_populate(mm, pmd, pte) BUG()
99
100#endif /* SUN3_PGALLOC_H */