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> /* for pte_{alloc,free}_one */ 15 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 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 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 41 #define pmd_pgtable(pmd) pmd_page(pmd) 42 43 static inline pgd_t *pgd_alloc(struct mm_struct *mm) 44 { 45 pgd_t *pgd; 46 47 pgd = (pgd_t *)__get_free_page(GFP_KERNEL); 48 if (likely(pgd != NULL)) { 49 memset(pgd, 0, USER_PTRS_PER_PGD * sizeof(pgd_t)); 50 /* Copy kernel mappings */ 51 memcpy(pgd + USER_PTRS_PER_PGD, 52 init_mm.pgd + USER_PTRS_PER_PGD, 53 (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t)); 54 } 55 return pgd; 56 } 57 58 static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd) 59 { 60 free_page((unsigned long)pgd); 61 } 62 63 #ifndef __PAGETABLE_PMD_FOLDED 64 65 static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr) 66 { 67 return (pmd_t *)__get_free_page( 68 GFP_KERNEL | __GFP_RETRY_MAYFAIL | __GFP_ZERO); 69 } 70 71 static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd) 72 { 73 free_page((unsigned long)pmd); 74 } 75 76 #define __pmd_free_tlb(tlb, pmd, addr) pmd_free((tlb)->mm, pmd) 77 78 #endif /* __PAGETABLE_PMD_FOLDED */ 79 80 #define __pte_free_tlb(tlb, pte, buf) \ 81 do { \ 82 pgtable_pte_page_dtor(pte); \ 83 tlb_remove_page((tlb), pte); \ 84 } while (0) 85 #endif /* CONFIG_MMU */ 86 87 #endif /* _ASM_RISCV_PGALLOC_H */ 88