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
pmd_populate_kernel(struct mm_struct * mm,pmd_t * pmd,pte_t * pte)16 static 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
pmd_populate(struct mm_struct * mm,pmd_t * pmd,pgtable_t pte)24 static 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
pud_populate(struct mm_struct * mm,pud_t * pud,pmd_t * pmd)33 static 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
sync_kernel_mappings(pgd_t * pgd)41 static inline void sync_kernel_mappings(pgd_t *pgd)
42 {
43 memcpy(pgd + USER_PTRS_PER_PGD,
44 init_mm.pgd + USER_PTRS_PER_PGD,
45 (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
46 }
47
pgd_alloc(struct mm_struct * mm)48 static inline pgd_t *pgd_alloc(struct mm_struct *mm)
49 {
50 pgd_t *pgd;
51
52 pgd = (pgd_t *)__get_free_page(GFP_KERNEL);
53 if (likely(pgd != NULL)) {
54 memset(pgd, 0, USER_PTRS_PER_PGD * sizeof(pgd_t));
55 /* Copy kernel mappings */
56 sync_kernel_mappings(pgd);
57 }
58 return pgd;
59 }
60
61 #ifndef __PAGETABLE_PMD_FOLDED
62
63 #define __pmd_free_tlb(tlb, pmd, addr) pmd_free((tlb)->mm, pmd)
64
65 #endif /* __PAGETABLE_PMD_FOLDED */
66
67 #define __pte_free_tlb(tlb, pte, buf) \
68 do { \
69 pgtable_pte_page_dtor(pte); \
70 tlb_remove_page((tlb), pte); \
71 } while (0)
72 #endif /* CONFIG_MMU */
73
74 #endif /* _ASM_RISCV_PGALLOC_H */
75