1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * include/asm-xtensa/pgalloc.h 4 * 5 * Copyright (C) 2001-2007 Tensilica Inc. 6 */ 7 8 #ifndef _XTENSA_PGALLOC_H 9 #define _XTENSA_PGALLOC_H 10 11 #include <linux/highmem.h> 12 #include <linux/slab.h> 13 14 /* 15 * Allocating and freeing a pmd is trivial: the 1-entry pmd is 16 * inside the pgd, so has no extra memory associated with it. 17 */ 18 19 #define pmd_populate_kernel(mm, pmdp, ptep) \ 20 (pmd_val(*(pmdp)) = ((unsigned long)ptep)) 21 #define pmd_populate(mm, pmdp, page) \ 22 (pmd_val(*(pmdp)) = ((unsigned long)page_to_virt(page))) 23 #define pmd_pgtable(pmd) pmd_page(pmd) 24 25 static inline pgd_t* 26 pgd_alloc(struct mm_struct *mm) 27 { 28 return (pgd_t*) __get_free_pages(GFP_KERNEL | __GFP_ZERO, PGD_ORDER); 29 } 30 31 static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd) 32 { 33 free_page((unsigned long)pgd); 34 } 35 36 static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm) 37 { 38 pte_t *ptep; 39 int i; 40 41 ptep = (pte_t *)__get_free_page(GFP_KERNEL); 42 if (!ptep) 43 return NULL; 44 for (i = 0; i < 1024; i++) 45 pte_clear(NULL, 0, ptep + i); 46 return ptep; 47 } 48 49 static inline pgtable_t pte_alloc_one(struct mm_struct *mm) 50 { 51 pte_t *pte; 52 struct page *page; 53 54 pte = pte_alloc_one_kernel(mm); 55 if (!pte) 56 return NULL; 57 page = virt_to_page(pte); 58 if (!pgtable_pte_page_ctor(page)) { 59 __free_page(page); 60 return NULL; 61 } 62 return page; 63 } 64 65 static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte) 66 { 67 free_page((unsigned long)pte); 68 } 69 70 static inline void pte_free(struct mm_struct *mm, pgtable_t pte) 71 { 72 pgtable_pte_page_dtor(pte); 73 __free_page(pte); 74 } 75 #define pmd_pgtable(pmd) pmd_page(pmd) 76 77 #endif /* _XTENSA_PGALLOC_H */ 78