1 files changed, 73 insertions, 0 deletions

diff --git a/arch/xtensa/include/asm/pgalloc.h b/arch/xtensa/include/asm/pgalloc.h
new file mode 100644
index 000000000000..4f4a7987eded
--- /dev/null
+++ b/arch/xtensa/include/asm/pgalloc.h
@@ -0,0 +1,73 @@
+/*
+ * include/asm-xtensa/pgalloc.h
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * Copyright (C) 2001-2007 Tensilica Inc.
+ */
+
+#ifndef _XTENSA_PGALLOC_H
+#define _XTENSA_PGALLOC_H
+
+#ifdef __KERNEL__
+
+#include <linux/highmem.h>
+
+/*
+ * Allocating and freeing a pmd is trivial: the 1-entry pmd is
+ * inside the pgd, so has no extra memory associated with it.
+ */
+
+#define pmd_populate_kernel(mm, pmdp, ptep)                                  \
+        (pmd_val(*(pmdp)) = ((unsigned long)ptep))
+#define pmd_populate(mm, pmdp, page)                                         \
+        (pmd_val(*(pmdp)) = ((unsigned long)page_to_virt(page)))
+#define pmd_pgtable(pmd) pmd_page(pmd)
+
+static inline pgd_t*
+pgd_alloc(struct mm_struct *mm)
+{
+        return (pgd_t*) __get_free_pages(GFP_KERNEL | __GFP_ZERO, PGD_ORDER);
+}
+
+static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
+{
+        free_page((unsigned long)pgd);
+}
+
+/* Use a slab cache for the pte pages (see also sparc64 implementation) */
+
+extern struct kmem_cache *pgtable_cache;
+
+static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm, 
+                                         unsigned long address)
+{
+        return kmem_cache_alloc(pgtable_cache, GFP_KERNEL|__GFP_REPEAT);
+}
+
+static inline pgtable_t pte_alloc_one(struct mm_struct *mm,
+                                        unsigned long addr)
+{
+        struct page *page;
+
+        page = virt_to_page(pte_alloc_one_kernel(mm, addr));
+        pgtable_page_ctor(page);
+        return page;
+}
+
+static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
+{
+        kmem_cache_free(pgtable_cache, pte);
+}
+
+static inline void pte_free(struct mm_struct *mm, pgtable_t pte)
+{
+        pgtable_page_dtor(pte);
+        kmem_cache_free(pgtable_cache, page_address(pte));
+}
+#define pmd_pgtable(pmd) pmd_page(pmd)
+
+#endif /* __KERNEL__ */
+#endif /* _XTENSA_PGALLOC_H */