Linux kernel mirror (for testing)
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1/* SPDX-License-Identifier: GPL-2.0 */
2// Copyright (C) 2005-2017 Andes Technology Corporation
3
4#ifndef _ASMNDS32_PGALLOC_H
5#define _ASMNDS32_PGALLOC_H
6
7#include <asm/processor.h>
8#include <asm/cacheflush.h>
9#include <asm/tlbflush.h>
10#include <asm/proc-fns.h>
11
12/*
13 * Since we have only two-level page tables, these are trivial
14 */
15#define pmd_alloc_one(mm, addr) ({ BUG(); ((pmd_t *)2); })
16#define pmd_free(mm, pmd) do { } while (0)
17#define pgd_populate(mm, pmd, pte) BUG()
18#define pmd_pgtable(pmd) pmd_page(pmd)
19
20extern pgd_t *pgd_alloc(struct mm_struct *mm);
21extern void pgd_free(struct mm_struct *mm, pgd_t * pgd);
22
23#define check_pgt_cache() do { } while (0)
24
25static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm)
26{
27 pte_t *pte;
28
29 pte =
30 (pte_t *) __get_free_page(GFP_KERNEL | __GFP_RETRY_MAYFAIL |
31 __GFP_ZERO);
32
33 return pte;
34}
35
36static inline pgtable_t pte_alloc_one(struct mm_struct *mm)
37{
38 pgtable_t pte;
39
40 pte = alloc_pages(GFP_KERNEL | __GFP_RETRY_MAYFAIL | __GFP_ZERO, 0);
41 if (pte)
42 cpu_dcache_wb_page((unsigned long)page_address(pte));
43
44 return pte;
45}
46
47/*
48 * Free one PTE table.
49 */
50static inline void pte_free_kernel(struct mm_struct *mm, pte_t * pte)
51{
52 if (pte) {
53 free_page((unsigned long)pte);
54 }
55}
56
57static inline void pte_free(struct mm_struct *mm, pgtable_t pte)
58{
59 __free_page(pte);
60}
61
62/*
63 * Populate the pmdp entry with a pointer to the pte. This pmd is part
64 * of the mm address space.
65 *
66 * Ensure that we always set both PMD entries.
67 */
68static inline void
69pmd_populate_kernel(struct mm_struct *mm, pmd_t * pmdp, pte_t * ptep)
70{
71 unsigned long pte_ptr = (unsigned long)ptep;
72 unsigned long pmdval;
73
74 BUG_ON(mm != &init_mm);
75
76 /*
77 * The pmd must be loaded with the physical
78 * address of the PTE table
79 */
80 pmdval = __pa(pte_ptr) | _PAGE_KERNEL_TABLE;
81 set_pmd(pmdp, __pmd(pmdval));
82}
83
84static inline void
85pmd_populate(struct mm_struct *mm, pmd_t * pmdp, pgtable_t ptep)
86{
87 unsigned long pmdval;
88
89 BUG_ON(mm == &init_mm);
90
91 pmdval = page_to_pfn(ptep) << PAGE_SHIFT | _PAGE_USER_TABLE;
92 set_pmd(pmdp, __pmd(pmdval));
93}
94
95#endif