2 * include/asm-xtensa/pgalloc.h
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
8 * Copyright (C) 2001-2007 Tensilica Inc.
11 #ifndef _XTENSA_PGALLOC_H
12 #define _XTENSA_PGALLOC_H
16 #include <linux/highmem.h>
17 #include <linux/slab.h>
20 * Allocating and freeing a pmd is trivial: the 1-entry pmd is
21 * inside the pgd, so has no extra memory associated with it.
24 #define pmd_populate_kernel(mm, pmdp, ptep) \
25 (pmd_val(*(pmdp)) = ((unsigned long)ptep))
26 #define pmd_populate(mm, pmdp, page) \
27 (pmd_val(*(pmdp)) = ((unsigned long)page_to_virt(page)))
28 #define pmd_pgtable(pmd) pmd_page(pmd)
31 pgd_alloc(struct mm_struct *mm)
33 return (pgd_t*) __get_free_pages(GFP_KERNEL | __GFP_ZERO, PGD_ORDER);
36 static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
38 free_page((unsigned long)pgd);
41 /* Use a slab cache for the pte pages (see also sparc64 implementation) */
43 extern struct kmem_cache *pgtable_cache;
45 static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
46 unsigned long address)
48 return kmem_cache_alloc(pgtable_cache, GFP_KERNEL|__GFP_REPEAT);
51 static inline pgtable_t pte_alloc_one(struct mm_struct *mm,
57 pte = pte_alloc_one_kernel(mm, addr);
60 page = virt_to_page(pte);
61 if (!pgtable_page_ctor(page)) {
62 kmem_cache_free(pgtable_cache, pte);
68 static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
70 kmem_cache_free(pgtable_cache, pte);
73 static inline void pte_free(struct mm_struct *mm, pgtable_t pte)
75 pgtable_page_dtor(pte);
76 kmem_cache_free(pgtable_cache, page_address(pte));
78 #define pmd_pgtable(pmd) pmd_page(pmd)
80 #endif /* __KERNEL__ */
81 #endif /* _XTENSA_PGALLOC_H */