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 __HAVE_ARCH_PTE_ALLOC_ONE_KERNEL
18#define __HAVE_ARCH_PTE_ALLOC_ONE
19#include <asm-generic/pgalloc.h>
20
21#define check_pgt_cache() do { } while (0)
22
23#define _PAGE_USER_TABLE (PMD_TYPE_TABLE | PMD_PRESENT)
24#define _PAGE_KERNEL_TABLE (PMD_TYPE_TABLE | PMD_PRESENT)
25
26extern pgd_t *get_pgd_slow(struct mm_struct *mm);
27extern void free_pgd_slow(struct mm_struct *mm, pgd_t *pgd);
28
29#define pgd_alloc(mm) get_pgd_slow(mm)
30#define pgd_free(mm, pgd) free_pgd_slow(mm, pgd)
31
32/*
33 * Allocate one PTE table.
34 */
35static inline pte_t *
36pte_alloc_one_kernel(struct mm_struct *mm)
37{
38 pte_t *pte = __pte_alloc_one_kernel(mm);
39
40 if (pte)
41 clean_dcache_area(pte, PTRS_PER_PTE * sizeof(pte_t));
42
43 return pte;
44}
45
46static inline pgtable_t
47pte_alloc_one(struct mm_struct *mm)
48{
49 struct page *pte;
50
51 pte = __pte_alloc_one(mm, GFP_PGTABLE_USER);
52 if (!pte)
53 return NULL;
54 if (!PageHighMem(pte))
55 clean_pte_table(page_address(pte));
56 return pte;
57}
58
59static inline void __pmd_populate(pmd_t *pmdp, unsigned long pmdval)
60{
61 set_pmd(pmdp, __pmd(pmdval));
62 flush_pmd_entry(pmdp);
63}
64
65/*
66 * Populate the pmdp entry with a pointer to the pte. This pmd is part
67 * of the mm address space.
68 */
69static inline void
70pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmdp, pte_t *ptep)
71{
72 unsigned long pte_ptr = (unsigned long)ptep;
73
74 /*
75 * The pmd must be loaded with the physical
76 * address of the PTE table
77 */
78 __pmd_populate(pmdp, __pa(pte_ptr) | _PAGE_KERNEL_TABLE);
79}
80
81static inline void
82pmd_populate(struct mm_struct *mm, pmd_t *pmdp, pgtable_t ptep)
83{
84 __pmd_populate(pmdp,
85 page_to_pfn(ptep) << PAGE_SHIFT | _PAGE_USER_TABLE);
86}
87#define pmd_pgtable(pmd) pmd_page(pmd)
88
89#endif