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1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * linux/arch/unicore32/include/asm/pgalloc.h
4 *
5 * Code specific to PKUnity SoC and UniCore ISA
6 *
7 * Copyright (C) 2001-2010 GUAN Xue-tao
8 */
9#ifndef __UNICORE_PGALLOC_H__
10#define __UNICORE_PGALLOC_H__
11
12#include <asm/pgtable-hwdef.h>
13#include <asm/processor.h>
14#include <asm/cacheflush.h>
15#include <asm/tlbflush.h>
16
17#define __HAVE_ARCH_PTE_ALLOC_ONE_KERNEL
18#define __HAVE_ARCH_PTE_ALLOC_ONE
19#include <asm-generic/pgalloc.h>
20
21#define _PAGE_USER_TABLE (PMD_TYPE_TABLE | PMD_PRESENT)
22#define _PAGE_KERNEL_TABLE (PMD_TYPE_TABLE | PMD_PRESENT)
23
24extern pgd_t *get_pgd_slow(struct mm_struct *mm);
25extern void free_pgd_slow(struct mm_struct *mm, pgd_t *pgd);
26
27#define pgd_alloc(mm) get_pgd_slow(mm)
28#define pgd_free(mm, pgd) free_pgd_slow(mm, pgd)
29
30/*
31 * Allocate one PTE table.
32 */
33static inline pte_t *
34pte_alloc_one_kernel(struct mm_struct *mm)
35{
36 pte_t *pte = __pte_alloc_one_kernel(mm);
37
38 if (pte)
39 clean_dcache_area(pte, PTRS_PER_PTE * sizeof(pte_t));
40
41 return pte;
42}
43
44static inline pgtable_t
45pte_alloc_one(struct mm_struct *mm)
46{
47 struct page *pte;
48
49 pte = __pte_alloc_one(mm, GFP_PGTABLE_USER);
50 if (!pte)
51 return NULL;
52 if (!PageHighMem(pte))
53 clean_pte_table(page_address(pte));
54 return pte;
55}
56
57static inline void __pmd_populate(pmd_t *pmdp, unsigned long pmdval)
58{
59 set_pmd(pmdp, __pmd(pmdval));
60 flush_pmd_entry(pmdp);
61}
62
63/*
64 * Populate the pmdp entry with a pointer to the pte. This pmd is part
65 * of the mm address space.
66 */
67static inline void
68pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmdp, pte_t *ptep)
69{
70 unsigned long pte_ptr = (unsigned long)ptep;
71
72 /*
73 * The pmd must be loaded with the physical
74 * address of the PTE table
75 */
76 __pmd_populate(pmdp, __pa(pte_ptr) | _PAGE_KERNEL_TABLE);
77}
78
79static inline void
80pmd_populate(struct mm_struct *mm, pmd_t *pmdp, pgtable_t ptep)
81{
82 __pmd_populate(pmdp,
83 page_to_pfn(ptep) << PAGE_SHIFT | _PAGE_USER_TABLE);
84}
85#define pmd_pgtable(pmd) pmd_page(pmd)
86
87#endif