1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _ASM_PGALLOC_H 3 #define _ASM_PGALLOC_H 4 5 #include <linux/gfp.h> 6 #include <linux/mm.h> 7 #include <linux/threads.h> 8 #include <asm/processor.h> 9 #include <asm/fixmap.h> 10 11 #include <asm/cache.h> 12 13 #define __HAVE_ARCH_PMD_ALLOC_ONE 14 #define __HAVE_ARCH_PMD_FREE 15 #define __HAVE_ARCH_PGD_FREE 16 #include <asm-generic/pgalloc.h> 17 18 /* Allocate the top level pgd (page directory) */ 19 static inline pgd_t *pgd_alloc(struct mm_struct *mm) 20 { 21 pgd_t *pgd; 22 23 pgd = (pgd_t *) __get_free_pages(GFP_KERNEL, PGD_ORDER); 24 if (unlikely(pgd == NULL)) 25 return NULL; 26 27 memset(pgd, 0, PAGE_SIZE << PGD_ORDER); 28 29 return pgd; 30 } 31 32 static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd) 33 { 34 free_pages((unsigned long)pgd, PGD_ORDER); 35 } 36 37 #if CONFIG_PGTABLE_LEVELS == 3 38 39 /* Three Level Page Table Support for pmd's */ 40 41 static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd) 42 { 43 set_pud(pud, __pud((PxD_FLAG_PRESENT | PxD_FLAG_VALID) + 44 (__u32)(__pa((unsigned long)pmd) >> PxD_VALUE_SHIFT))); 45 } 46 47 static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address) 48 { 49 pmd_t *pmd; 50 51 pmd = (pmd_t *)__get_free_pages(GFP_PGTABLE_KERNEL, PMD_TABLE_ORDER); 52 if (likely(pmd)) 53 memset ((void *)pmd, 0, PAGE_SIZE << PMD_TABLE_ORDER); 54 return pmd; 55 } 56 57 static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd) 58 { 59 free_pages((unsigned long)pmd, PMD_TABLE_ORDER); 60 } 61 #endif 62 63 static inline void 64 pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd, pte_t *pte) 65 { 66 set_pmd(pmd, __pmd((PxD_FLAG_PRESENT | PxD_FLAG_VALID) 67 + (__u32)(__pa((unsigned long)pte) >> PxD_VALUE_SHIFT))); 68 } 69 70 #define pmd_populate(mm, pmd, pte_page) \ 71 pmd_populate_kernel(mm, pmd, page_address(pte_page)) 72 73 #endif 74