Linux kernel mirror (for testing)
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1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * Copyright (C) 2009 Chen Liqin <liqin.chen@sunplusct.com>
4 * Copyright (C) 2012 Regents of the University of California
5 */
6
7#ifndef _ASM_RISCV_PGALLOC_H
8#define _ASM_RISCV_PGALLOC_H
9
10#include <linux/mm.h>
11#include <asm/tlb.h>
12
13#include <asm-generic/pgalloc.h> /* for pte_{alloc,free}_one */
14
15static inline void pmd_populate_kernel(struct mm_struct *mm,
16 pmd_t *pmd, pte_t *pte)
17{
18 unsigned long pfn = virt_to_pfn(pte);
19
20 set_pmd(pmd, __pmd((pfn << _PAGE_PFN_SHIFT) | _PAGE_TABLE));
21}
22
23static inline void pmd_populate(struct mm_struct *mm,
24 pmd_t *pmd, pgtable_t pte)
25{
26 unsigned long pfn = virt_to_pfn(page_address(pte));
27
28 set_pmd(pmd, __pmd((pfn << _PAGE_PFN_SHIFT) | _PAGE_TABLE));
29}
30
31#ifndef __PAGETABLE_PMD_FOLDED
32static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
33{
34 unsigned long pfn = virt_to_pfn(pmd);
35
36 set_pud(pud, __pud((pfn << _PAGE_PFN_SHIFT) | _PAGE_TABLE));
37}
38#endif /* __PAGETABLE_PMD_FOLDED */
39
40#define pmd_pgtable(pmd) pmd_page(pmd)
41
42static inline pgd_t *pgd_alloc(struct mm_struct *mm)
43{
44 pgd_t *pgd;
45
46 pgd = (pgd_t *)__get_free_page(GFP_KERNEL);
47 if (likely(pgd != NULL)) {
48 memset(pgd, 0, USER_PTRS_PER_PGD * sizeof(pgd_t));
49 /* Copy kernel mappings */
50 memcpy(pgd + USER_PTRS_PER_PGD,
51 init_mm.pgd + USER_PTRS_PER_PGD,
52 (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
53 }
54 return pgd;
55}
56
57static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
58{
59 free_page((unsigned long)pgd);
60}
61
62#ifndef __PAGETABLE_PMD_FOLDED
63
64static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr)
65{
66 return (pmd_t *)__get_free_page(
67 GFP_KERNEL | __GFP_RETRY_MAYFAIL | __GFP_ZERO);
68}
69
70static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
71{
72 free_page((unsigned long)pmd);
73}
74
75#define __pmd_free_tlb(tlb, pmd, addr) pmd_free((tlb)->mm, pmd)
76
77#endif /* __PAGETABLE_PMD_FOLDED */
78
79#define __pte_free_tlb(tlb, pte, buf) \
80do { \
81 pgtable_page_dtor(pte); \
82 tlb_remove_page((tlb), pte); \
83} while (0)
84
85static inline void check_pgt_cache(void)
86{
87}
88
89#endif /* _ASM_RISCV_PGALLOC_H */