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 15 static 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 23 static 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 32 static 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 42 static 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 57 static 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 64 static 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 70 static 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) \ 80 do { \ 81 pgtable_page_dtor(pte); \ 82 tlb_remove_page((tlb), pte); \ 83 } while (0) 84 85 static inline void check_pgt_cache(void) 86 { 87 } 88 89 #endif /* _ASM_RISCV_PGALLOC_H */ 90