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 #ifdef CONFIG_MMU
12 #include <linux/highmem.h>
13 #include <linux/slab.h>
14
15 #define __HAVE_ARCH_PTE_ALLOC_ONE_KERNEL
16 #define __HAVE_ARCH_PTE_ALLOC_ONE
17 #include <asm-generic/pgalloc.h>
18
19 /*
20 * Allocating and freeing a pmd is trivial: the 1-entry pmd is
21 * inside the pgd, so has no extra memory associated with it.
22 */
23
24 #define pmd_populate_kernel(mm, pmdp, ptep) \
25 (pmd_val(*(pmdp)) = ((unsigned long)ptep))
26 #define pmd_populate(mm, pmdp, page) \
27 (pmd_val(*(pmdp)) = ((unsigned long)page_to_virt(page)))
28
29 static inline pgd_t*
30 pgd_alloc(struct mm_struct *mm)
31 {
32 return (pgd_t*) __get_free_page(GFP_KERNEL | __GFP_ZERO);
33 }
34
35 static inline void ptes_clear(pte_t *ptep)
36 {
37 int i;
38
39 for (i = 0; i < PTRS_PER_PTE; i++)
40 pte_clear(NULL, 0, ptep + i);
41 }
42
43 static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm)
44 {
45 pte_t *ptep;
46
47 ptep = (pte_t *)__pte_alloc_one_kernel(mm);
48 if (!ptep)
49 return NULL;
50 ptes_clear(ptep);
51 return ptep;
52 }
53
54 static inline pgtable_t pte_alloc_one(struct mm_struct *mm)
55 {
56 struct page *page;
57
58 page = __pte_alloc_one(mm, GFP_PGTABLE_USER);
59 if (!page)
60 return NULL;
61 ptes_clear(page_address(page));
62 return page;
63 }
64
65 #endif /* CONFIG_MMU */
66
67 #endif /* _XTENSA_PGALLOC_H */
68
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