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#define __HAVE_ARCH_PTE_ALLOC_ONE
13#include <asm-generic/pgalloc.h> /* for pte_{alloc,free}_one */
14
15/*
16 * Since we have only two-level page tables, these are trivial
17 */
18#define pmd_alloc_one(mm, addr) ({ BUG(); ((pmd_t *)2); })
19#define pmd_free(mm, pmd) do { } while (0)
20#define pgd_populate(mm, pmd, pte) BUG()
21#define pmd_pgtable(pmd) pmd_page(pmd)
22
23extern pgd_t *pgd_alloc(struct mm_struct *mm);
24extern void pgd_free(struct mm_struct *mm, pgd_t * pgd);
25
26#define check_pgt_cache() do { } while (0)
27
28static inline pgtable_t pte_alloc_one(struct mm_struct *mm)
29{
30 pgtable_t pte;
31
32 pte = __pte_alloc_one(mm, GFP_PGTABLE_USER);
33 if (pte)
34 cpu_dcache_wb_page((unsigned long)page_address(pte));
35
36 return pte;
37}
38
39/*
40 * Populate the pmdp entry with a pointer to the pte. This pmd is part
41 * of the mm address space.
42 *
43 * Ensure that we always set both PMD entries.
44 */
45static inline void
46pmd_populate_kernel(struct mm_struct *mm, pmd_t * pmdp, pte_t * ptep)
47{
48 unsigned long pte_ptr = (unsigned long)ptep;
49 unsigned long pmdval;
50
51 BUG_ON(mm != &init_mm);
52
53 /*
54 * The pmd must be loaded with the physical
55 * address of the PTE table
56 */
57 pmdval = __pa(pte_ptr) | _PAGE_KERNEL_TABLE;
58 set_pmd(pmdp, __pmd(pmdval));
59}
60
61static inline void
62pmd_populate(struct mm_struct *mm, pmd_t * pmdp, pgtable_t ptep)
63{
64 unsigned long pmdval;
65
66 BUG_ON(mm == &init_mm);
67
68 pmdval = page_to_pfn(ptep) << PAGE_SHIFT | _PAGE_USER_TABLE;
69 set_pmd(pmdp, __pmd(pmdval));
70}
71
72#endif