1 #ifndef _ASM_POWERPC_BOOK3S_32_PGALLOC_H 2 #define _ASM_POWERPC_BOOK3S_32_PGALLOC_H 3 4 #include <linux/threads.h> 5 #include <linux/slab.h> 6 7 /* 8 * Functions that deal with pagetables that could be at any level of 9 * the table need to be passed an "index_size" so they know how to 10 * handle allocation. For PTE pages (which are linked to a struct 11 * page for now, and drawn from the main get_free_pages() pool), the 12 * allocation size will be (2^index_size * sizeof(pointer)) and 13 * allocations are drawn from the kmem_cache in PGT_CACHE(index_size). 14 * 15 * The maximum index size needs to be big enough to allow any 16 * pagetable sizes we need, but small enough to fit in the low bits of 17 * any page table pointer. In other words all pagetables, even tiny 18 * ones, must be aligned to allow at least enough low 0 bits to 19 * contain this value. This value is also used as a mask, so it must 20 * be one less than a power of two. 21 */ 22 #define MAX_PGTABLE_INDEX_SIZE 0xf 23 24 extern void __bad_pte(pmd_t *pmd); 25 26 extern struct kmem_cache *pgtable_cache[]; 27 #define PGT_CACHE(shift) ({ \ 28 BUG_ON(!(shift)); \ 29 pgtable_cache[(shift) - 1]; \ 30 }) 31 32 static inline pgd_t *pgd_alloc(struct mm_struct *mm) 33 { 34 return kmem_cache_alloc(PGT_CACHE(PGD_INDEX_SIZE), GFP_KERNEL); 35 } 36 37 static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd) 38 { 39 kmem_cache_free(PGT_CACHE(PGD_INDEX_SIZE), pgd); 40 } 41 42 /* 43 * We don't have any real pmd's, and this code never triggers because 44 * the pgd will always be present.. 45 */ 46 /* #define pmd_alloc_one(mm,address) ({ BUG(); ((pmd_t *)2); }) */ 47 #define pmd_free(mm, x) do { } while (0) 48 #define __pmd_free_tlb(tlb,x,a) do { } while (0) 49 /* #define pgd_populate(mm, pmd, pte) BUG() */ 50 51 #ifndef CONFIG_BOOKE 52 53 static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmdp, 54 pte_t *pte) 55 { 56 *pmdp = __pmd(__pa(pte) | _PMD_PRESENT); 57 } 58 59 static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmdp, 60 pgtable_t pte_page) 61 { 62 *pmdp = __pmd((page_to_pfn(pte_page) << PAGE_SHIFT) | _PMD_PRESENT); 63 } 64 65 #define pmd_pgtable(pmd) pmd_page(pmd) 66 #else 67 68 static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmdp, 69 pte_t *pte) 70 { 71 *pmdp = __pmd((unsigned long)pte | _PMD_PRESENT); 72 } 73 74 static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmdp, 75 pgtable_t pte_page) 76 { 77 *pmdp = __pmd((unsigned long)lowmem_page_address(pte_page) | _PMD_PRESENT); 78 } 79 80 #define pmd_pgtable(pmd) pmd_page(pmd) 81 #endif 82 83 extern pte_t *pte_alloc_one_kernel(struct mm_struct *mm, unsigned long addr); 84 extern pgtable_t pte_alloc_one(struct mm_struct *mm, unsigned long addr); 85 86 static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte) 87 { 88 free_page((unsigned long)pte); 89 } 90 91 static inline void pte_free(struct mm_struct *mm, pgtable_t ptepage) 92 { 93 pgtable_page_dtor(ptepage); 94 __free_page(ptepage); 95 } 96 97 static inline void pgtable_free(void *table, unsigned index_size) 98 { 99 if (!index_size) { 100 free_page((unsigned long)table); 101 } else { 102 BUG_ON(index_size > MAX_PGTABLE_INDEX_SIZE); 103 kmem_cache_free(PGT_CACHE(index_size), table); 104 } 105 } 106 107 #define check_pgt_cache() do { } while (0) 108 109 #ifdef CONFIG_SMP 110 static inline void pgtable_free_tlb(struct mmu_gather *tlb, 111 void *table, int shift) 112 { 113 unsigned long pgf = (unsigned long)table; 114 BUG_ON(shift > MAX_PGTABLE_INDEX_SIZE); 115 pgf |= shift; 116 tlb_remove_table(tlb, (void *)pgf); 117 } 118 119 static inline void __tlb_remove_table(void *_table) 120 { 121 void *table = (void *)((unsigned long)_table & ~MAX_PGTABLE_INDEX_SIZE); 122 unsigned shift = (unsigned long)_table & MAX_PGTABLE_INDEX_SIZE; 123 124 pgtable_free(table, shift); 125 } 126 #else 127 static inline void pgtable_free_tlb(struct mmu_gather *tlb, 128 void *table, int shift) 129 { 130 pgtable_free(table, shift); 131 } 132 #endif 133 134 static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t table, 135 unsigned long address) 136 { 137 pgtable_page_dtor(table); 138 pgtable_free_tlb(tlb, page_address(table), 0); 139 } 140 #endif /* _ASM_POWERPC_BOOK3S_32_PGALLOC_H */ 141