Linux kernel mirror (for testing)
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1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * include/asm-xtensa/pgalloc.h
4 *
5 * Copyright (C) 2001-2007 Tensilica Inc.
6 */
7
8#ifndef _XTENSA_PGALLOC_H
9#define _XTENSA_PGALLOC_H
10
11#include <linux/highmem.h>
12#include <linux/slab.h>
13
14/*
15 * Allocating and freeing a pmd is trivial: the 1-entry pmd is
16 * inside the pgd, so has no extra memory associated with it.
17 */
18
19#define pmd_populate_kernel(mm, pmdp, ptep) \
20 (pmd_val(*(pmdp)) = ((unsigned long)ptep))
21#define pmd_populate(mm, pmdp, page) \
22 (pmd_val(*(pmdp)) = ((unsigned long)page_to_virt(page)))
23#define pmd_pgtable(pmd) pmd_page(pmd)
24
25static inline pgd_t*
26pgd_alloc(struct mm_struct *mm)
27{
28 return (pgd_t*) __get_free_pages(GFP_KERNEL | __GFP_ZERO, PGD_ORDER);
29}
30
31static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
32{
33 free_page((unsigned long)pgd);
34}
35
36static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm)
37{
38 pte_t *ptep;
39 int i;
40
41 ptep = (pte_t *)__get_free_page(GFP_KERNEL);
42 if (!ptep)
43 return NULL;
44 for (i = 0; i < 1024; i++)
45 pte_clear(NULL, 0, ptep + i);
46 return ptep;
47}
48
49static inline pgtable_t pte_alloc_one(struct mm_struct *mm)
50{
51 pte_t *pte;
52 struct page *page;
53
54 pte = pte_alloc_one_kernel(mm);
55 if (!pte)
56 return NULL;
57 page = virt_to_page(pte);
58 if (!pgtable_pte_page_ctor(page)) {
59 __free_page(page);
60 return NULL;
61 }
62 return page;
63}
64
65static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
66{
67 free_page((unsigned long)pte);
68}
69
70static inline void pte_free(struct mm_struct *mm, pgtable_t pte)
71{
72 pgtable_pte_page_dtor(pte);
73 __free_page(pte);
74}
75#define pmd_pgtable(pmd) pmd_page(pmd)
76
77#endif /* _XTENSA_PGALLOC_H */