1 #ifndef __ASM_SH_PGALLOC_H 2 #define __ASM_SH_PGALLOC_H 3 4 #include <linux/quicklist.h> 5 #include <asm/page.h> 6 7 #define QUICK_PGD 0 /* We preserve special mappings over free */ 8 #define QUICK_PT 1 /* Other page table pages that are zero on free */ 9 10 static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd, 11 pte_t *pte) 12 { 13 set_pmd(pmd, __pmd((unsigned long)pte)); 14 } 15 16 static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd, 17 pgtable_t pte) 18 { 19 set_pmd(pmd, __pmd((unsigned long)page_address(pte))); 20 } 21 #define pmd_pgtable(pmd) pmd_page(pmd) 22 23 static inline void pgd_ctor(void *x) 24 { 25 pgd_t *pgd = x; 26 27 memcpy(pgd + USER_PTRS_PER_PGD, 28 swapper_pg_dir + USER_PTRS_PER_PGD, 29 (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t)); 30 } 31 32 /* 33 * Allocate and free page tables. 34 */ 35 static inline pgd_t *pgd_alloc(struct mm_struct *mm) 36 { 37 return quicklist_alloc(QUICK_PGD, GFP_KERNEL | __GFP_REPEAT, pgd_ctor); 38 } 39 40 static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd) 41 { 42 quicklist_free(QUICK_PGD, NULL, pgd); 43 } 44 45 static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm, 46 unsigned long address) 47 { 48 return quicklist_alloc(QUICK_PT, GFP_KERNEL | __GFP_REPEAT, NULL); 49 } 50 51 static inline pgtable_t pte_alloc_one(struct mm_struct *mm, 52 unsigned long address) 53 { 54 struct page *page; 55 void *pg; 56 57 pg = quicklist_alloc(QUICK_PT, GFP_KERNEL | __GFP_REPEAT, NULL); 58 if (!pg) 59 return NULL; 60 page = virt_to_page(pg); 61 pgtable_page_ctor(page); 62 return page; 63 } 64 65 static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte) 66 { 67 quicklist_free(QUICK_PT, NULL, pte); 68 } 69 70 static inline void pte_free(struct mm_struct *mm, pgtable_t pte) 71 { 72 pgtable_page_dtor(pte); 73 quicklist_free_page(QUICK_PT, NULL, pte); 74 } 75 76 #define __pte_free_tlb(tlb,pte) \ 77 do { \ 78 pgtable_page_dtor(pte); \ 79 tlb_remove_page((tlb), (pte)); \ 80 } while (0) 81 82 /* 83 * allocating and freeing a pmd is trivial: the 1-entry pmd is 84 * inside the pgd, so has no extra memory associated with it. 85 */ 86 87 #define pmd_free(mm, x) do { } while (0) 88 #define __pmd_free_tlb(tlb,x) do { } while (0) 89 90 static inline void check_pgt_cache(void) 91 { 92 quicklist_trim(QUICK_PGD, NULL, 25, 16); 93 quicklist_trim(QUICK_PT, NULL, 25, 16); 94 } 95 96 #endif /* __ASM_SH_PGALLOC_H */ 97