1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef __ASM_SH_PGALLOC_H 3 #define __ASM_SH_PGALLOC_H 4 5 #include <linux/quicklist.h> 6 #include <asm/page.h> 7 8 #define QUICK_PT 0 /* Other page table pages that are zero on free */ 9 10 extern pgd_t *pgd_alloc(struct mm_struct *); 11 extern void pgd_free(struct mm_struct *mm, pgd_t *pgd); 12 13 #if PAGETABLE_LEVELS > 2 14 extern void pud_populate(struct mm_struct *mm, pud_t *pudp, pmd_t *pmd); 15 extern pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address); 16 extern void pmd_free(struct mm_struct *mm, pmd_t *pmd); 17 #endif 18 19 static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd, 20 pte_t *pte) 21 { 22 set_pmd(pmd, __pmd((unsigned long)pte)); 23 } 24 25 static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd, 26 pgtable_t pte) 27 { 28 set_pmd(pmd, __pmd((unsigned long)page_address(pte))); 29 } 30 #define pmd_pgtable(pmd) pmd_page(pmd) 31 32 /* 33 * Allocate and free page tables. 34 */ 35 static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm, 36 unsigned long address) 37 { 38 return quicklist_alloc(QUICK_PT, GFP_KERNEL, NULL); 39 } 40 41 static inline pgtable_t pte_alloc_one(struct mm_struct *mm, 42 unsigned long address) 43 { 44 struct page *page; 45 void *pg; 46 47 pg = quicklist_alloc(QUICK_PT, GFP_KERNEL, NULL); 48 if (!pg) 49 return NULL; 50 page = virt_to_page(pg); 51 if (!pgtable_page_ctor(page)) { 52 quicklist_free(QUICK_PT, NULL, pg); 53 return NULL; 54 } 55 return page; 56 } 57 58 static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte) 59 { 60 quicklist_free(QUICK_PT, NULL, pte); 61 } 62 63 static inline void pte_free(struct mm_struct *mm, pgtable_t pte) 64 { 65 pgtable_page_dtor(pte); 66 quicklist_free_page(QUICK_PT, NULL, pte); 67 } 68 69 #define __pte_free_tlb(tlb,pte,addr) \ 70 do { \ 71 pgtable_page_dtor(pte); \ 72 tlb_remove_page((tlb), (pte)); \ 73 } while (0) 74 75 static inline void check_pgt_cache(void) 76 { 77 quicklist_trim(QUICK_PT, NULL, 25, 16); 78 } 79 80 #endif /* __ASM_SH_PGALLOC_H */ 81