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#define pmd_pgtable(pmd) pmd_page(pmd)
29
30static inline pgd_t*
31pgd_alloc(struct mm_struct *mm)
32{
33	return (pgd_t*) __get_free_pages(GFP_KERNEL | __GFP_ZERO, PGD_ORDER);
34}
35
36static inline void ptes_clear(pte_t *ptep)
37{
38	int i;
39
40	for (i = 0; i < PTRS_PER_PTE; i++)
41		pte_clear(NULL, 0, ptep + i);
42}
43
44static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm)
45{
46	pte_t *ptep;
47
48	ptep = (pte_t *)__pte_alloc_one_kernel(mm);
49	if (!ptep)
50		return NULL;
51	ptes_clear(ptep);
52	return ptep;
53}
54
55static inline pgtable_t pte_alloc_one(struct mm_struct *mm)
56{
57	struct page *page;
58
59	page = __pte_alloc_one(mm, GFP_PGTABLE_USER);
60	if (!page)
61		return NULL;
62	ptes_clear(page_address(page));
63	return page;
64}
65
66#define pmd_pgtable(pmd) pmd_page(pmd)
67#endif /* CONFIG_MMU */
68
69#endif /* _XTENSA_PGALLOC_H */
70