Linux kernel mirror (for testing)
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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 check_pgt_cache() do { } while (0)
18
19#define _PAGE_USER_TABLE (PMD_TYPE_TABLE | PMD_PRESENT)
20#define _PAGE_KERNEL_TABLE (PMD_TYPE_TABLE | PMD_PRESENT)
21
22extern pgd_t *get_pgd_slow(struct mm_struct *mm);
23extern void free_pgd_slow(struct mm_struct *mm, pgd_t *pgd);
24
25#define pgd_alloc(mm) get_pgd_slow(mm)
26#define pgd_free(mm, pgd) free_pgd_slow(mm, pgd)
27
28#define PGALLOC_GFP (GFP_KERNEL | __GFP_ZERO)
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;
37
38 pte = (pte_t *)__get_free_page(PGALLOC_GFP);
39 if (pte)
40 clean_dcache_area(pte, PTRS_PER_PTE * sizeof(pte_t));
41
42 return pte;
43}
44
45static inline pgtable_t
46pte_alloc_one(struct mm_struct *mm)
47{
48 struct page *pte;
49
50 pte = alloc_pages(PGALLOC_GFP, 0);
51 if (!pte)
52 return NULL;
53 if (!PageHighMem(pte)) {
54 void *page = page_address(pte);
55 clean_dcache_area(page, PTRS_PER_PTE * sizeof(pte_t));
56 }
57 if (!pgtable_page_ctor(pte)) {
58 __free_page(pte);
59 }
60
61 return pte;
62}
63
64/*
65 * Free one PTE table.
66 */
67static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
68{
69 if (pte)
70 free_page((unsigned long)pte);
71}
72
73static inline void pte_free(struct mm_struct *mm, pgtable_t pte)
74{
75 pgtable_page_dtor(pte);
76 __free_page(pte);
77}
78
79static inline void __pmd_populate(pmd_t *pmdp, unsigned long pmdval)
80{
81 set_pmd(pmdp, __pmd(pmdval));
82 flush_pmd_entry(pmdp);
83}
84
85/*
86 * Populate the pmdp entry with a pointer to the pte. This pmd is part
87 * of the mm address space.
88 */
89static inline void
90pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmdp, pte_t *ptep)
91{
92 unsigned long pte_ptr = (unsigned long)ptep;
93
94 /*
95 * The pmd must be loaded with the physical
96 * address of the PTE table
97 */
98 __pmd_populate(pmdp, __pa(pte_ptr) | _PAGE_KERNEL_TABLE);
99}
100
101static inline void
102pmd_populate(struct mm_struct *mm, pmd_t *pmdp, pgtable_t ptep)
103{
104 __pmd_populate(pmdp,
105 page_to_pfn(ptep) << PAGE_SHIFT | _PAGE_USER_TABLE);
106}
107#define pmd_pgtable(pmd) pmd_page(pmd)
108
109#endif