Linux kernel mirror (for testing)
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linux
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#ifdef CONFIG_MMU
14#include <asm-generic/pgalloc.h>
15
16static inline void pmd_populate_kernel(struct mm_struct *mm,
17 pmd_t *pmd, pte_t *pte)
18{
19 unsigned long pfn = virt_to_pfn(pte);
20
21 set_pmd(pmd, __pmd((pfn << _PAGE_PFN_SHIFT) | _PAGE_TABLE));
22}
23
24static inline void pmd_populate(struct mm_struct *mm,
25 pmd_t *pmd, pgtable_t pte)
26{
27 unsigned long pfn = virt_to_pfn(page_address(pte));
28
29 set_pmd(pmd, __pmd((pfn << _PAGE_PFN_SHIFT) | _PAGE_TABLE));
30}
31
32#ifndef __PAGETABLE_PMD_FOLDED
33static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
34{
35 unsigned long pfn = virt_to_pfn(pmd);
36
37 set_pud(pud, __pud((pfn << _PAGE_PFN_SHIFT) | _PAGE_TABLE));
38}
39#endif /* __PAGETABLE_PMD_FOLDED */
40
41static inline pgd_t *pgd_alloc(struct mm_struct *mm)
42{
43 pgd_t *pgd;
44
45 pgd = (pgd_t *)__get_free_page(GFP_KERNEL);
46 if (likely(pgd != NULL)) {
47 memset(pgd, 0, USER_PTRS_PER_PGD * sizeof(pgd_t));
48 /* Copy kernel mappings */
49 memcpy(pgd + USER_PTRS_PER_PGD,
50 init_mm.pgd + USER_PTRS_PER_PGD,
51 (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
52 }
53 return pgd;
54}
55
56#ifndef __PAGETABLE_PMD_FOLDED
57
58#define __pmd_free_tlb(tlb, pmd, addr) pmd_free((tlb)->mm, pmd)
59
60#endif /* __PAGETABLE_PMD_FOLDED */
61
62#define __pte_free_tlb(tlb, pte, buf) \
63do { \
64 pgtable_pte_page_dtor(pte); \
65 tlb_remove_page((tlb), pte); \
66} while (0)
67#endif /* CONFIG_MMU */
68
69#endif /* _ASM_RISCV_PGALLOC_H */