1 files changed, 51 insertions, 0 deletions

diff --git a/arch/powerpc/include/asm/pgalloc.h b/arch/powerpc/include/asm/pgalloc.h
index e11f03007b57..2b2c60a1a66d 100644
--- a/arch/powerpc/include/asm/pgalloc.h
+++ b/arch/powerpc/include/asm/pgalloc.h
@@ -20,10 +20,61 @@ static inline gfp_t pgtable_gfp_flags(struct mm_struct *mm, gfp_t gfp)
 
 #define PGALLOC_GFP (GFP_KERNEL | __GFP_ZERO)
 
+pte_t *pte_fragment_alloc(struct mm_struct *mm, int kernel);
+
+static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm)
+{
+        return (pte_t *)pte_fragment_alloc(mm, 1);
+}
+
+static inline pgtable_t pte_alloc_one(struct mm_struct *mm)
+{
+        return (pgtable_t)pte_fragment_alloc(mm, 0);
+}
+
+void pte_frag_destroy(void *pte_frag);
+void pte_fragment_free(unsigned long *table, int kernel);
+
+static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
+{
+        pte_fragment_free((unsigned long *)pte, 1);
+}
+
+static inline void pte_free(struct mm_struct *mm, pgtable_t ptepage)
+{
+        pte_fragment_free((unsigned long *)ptepage, 0);
+}
+
+/*
+ * Functions that deal with pagetables that could be at any level of
+ * the table need to be passed an "index_size" so they know how to
+ * handle allocation.  For PTE pages, the allocation size will be
+ * (2^index_size * sizeof(pointer)) and allocations are drawn from
+ * the kmem_cache in PGT_CACHE(index_size).
+ *
+ * The maximum index size needs to be big enough to allow any
+ * pagetable sizes we need, but small enough to fit in the low bits of
+ * any page table pointer.  In other words all pagetables, even tiny
+ * ones, must be aligned to allow at least enough low 0 bits to
+ * contain this value.  This value is also used as a mask, so it must
+ * be one less than a power of two.
+ */
+#define MAX_PGTABLE_INDEX_SIZE  0xf
+
+extern struct kmem_cache *pgtable_cache[];
+#define PGT_CACHE(shift) pgtable_cache[shift]
+
+static inline void check_pgt_cache(void) { }
+
 #ifdef CONFIG_PPC_BOOK3S
 #include <asm/book3s/pgalloc.h>
 #else
 #include <asm/nohash/pgalloc.h>
 #endif
 
+static inline pgtable_t pmd_pgtable(pmd_t pmd)
+{
+        return (pgtable_t)pmd_page_vaddr(pmd);
+}
+
 #endif /* _ASM_POWERPC_PGALLOC_H */