1 #ifndef _ASM_POWERPC_PGALLOC_32_H 2 #define _ASM_POWERPC_PGALLOC_32_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), 35 pgtable_gfp_flags(mm, GFP_KERNEL)); 36 } 37 38 static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd) 39 { 40 kmem_cache_free(PGT_CACHE(PGD_INDEX_SIZE), pgd); 41 } 42 43 /* 44 * We don't have any real pmd's, and this code never triggers because 45 * the pgd will always be present.. 46 */ 47 /* #define pmd_alloc_one(mm,address) ({ BUG(); ((pmd_t *)2); }) */ 48 #define pmd_free(mm, x) do { } while (0) 49 #define __pmd_free_tlb(tlb,x,a) do { } while (0) 50 /* #define pgd_populate(mm, pmd, pte) BUG() */ 51 52 #ifndef CONFIG_BOOKE 53 54 static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmdp, 55 pte_t *pte) 56 { 57 *pmdp = __pmd(__pa(pte) | _PMD_PRESENT); 58 } 59 60 static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmdp, 61 pgtable_t pte_page) 62 { 63 *pmdp = __pmd((page_to_pfn(pte_page) << PAGE_SHIFT) | _PMD_PRESENT); 64 } 65 66 #define pmd_pgtable(pmd) pmd_page(pmd) 67 #else 68 69 static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmdp, 70 pte_t *pte) 71 { 72 *pmdp = __pmd((unsigned long)pte | _PMD_PRESENT); 73 } 74 75 static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmdp, 76 pgtable_t pte_page) 77 { 78 *pmdp = __pmd((unsigned long)lowmem_page_address(pte_page) | _PMD_PRESENT); 79 } 80 81 #define pmd_pgtable(pmd) pmd_page(pmd) 82 #endif 83 84 extern pte_t *pte_alloc_one_kernel(struct mm_struct *mm, unsigned long addr); 85 extern pgtable_t pte_alloc_one(struct mm_struct *mm, unsigned long addr); 86 87 static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte) 88 { 89 free_page((unsigned long)pte); 90 } 91 92 static inline void pte_free(struct mm_struct *mm, pgtable_t ptepage) 93 { 94 pgtable_page_dtor(ptepage); 95 __free_page(ptepage); 96 } 97 98 static inline void pgtable_free(void *table, unsigned index_size) 99 { 100 if (!index_size) { 101 free_page((unsigned long)table); 102 } else { 103 BUG_ON(index_size > MAX_PGTABLE_INDEX_SIZE); 104 kmem_cache_free(PGT_CACHE(index_size), table); 105 } 106 } 107 108 #define check_pgt_cache() do { } while (0) 109 110 #ifdef CONFIG_SMP 111 static inline void pgtable_free_tlb(struct mmu_gather *tlb, 112 void *table, int shift) 113 { 114 unsigned long pgf = (unsigned long)table; 115 BUG_ON(shift > MAX_PGTABLE_INDEX_SIZE); 116 pgf |= shift; 117 tlb_remove_table(tlb, (void *)pgf); 118 } 119 120 static inline void __tlb_remove_table(void *_table) 121 { 122 void *table = (void *)((unsigned long)_table & ~MAX_PGTABLE_INDEX_SIZE); 123 unsigned shift = (unsigned long)_table & MAX_PGTABLE_INDEX_SIZE; 124 125 pgtable_free(table, shift); 126 } 127 #else 128 static inline void pgtable_free_tlb(struct mmu_gather *tlb, 129 void *table, int shift) 130 { 131 pgtable_free(table, shift); 132 } 133 #endif 134 135 static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t table, 136 unsigned long address) 137 { 138 tlb_flush_pgtable(tlb, address); 139 pgtable_page_dtor(table); 140 pgtable_free_tlb(tlb, page_address(table), 0); 141 } 142 #endif /* _ASM_POWERPC_PGALLOC_32_H */ 143