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
14 #include <linux/highmem.h>
15 #include <linux/slab.h>
18 * Allocating and freeing a pmd is trivial: the 1-entry pmd is
19 * inside the pgd, so has no extra memory associated with it.
22 #define pmd_populate_kernel(mm, pmdp, ptep) \
23 (pmd_val(*(pmdp)) = ((unsigned long)ptep))
24 #define pmd_populate(mm, pmdp, page) \
25 (pmd_val(*(pmdp)) = ((unsigned long)page_to_virt(page)))
26 #define pmd_pgtable(pmd) pmd_page(pmd)
29 pgd_alloc(struct mm_struct *mm)
31 return (pgd_t*) __get_free_pages(GFP_KERNEL | __GFP_ZERO, PGD_ORDER);
34 static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
36 free_page((unsigned long)pgd);
39 static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm)
44 ptep = (pte_t *)__get_free_page(GFP_KERNEL);
47 for (i = 0; i < 1024; i++)
48 pte_clear(NULL, 0, ptep + i);
52 static inline pgtable_t pte_alloc_one(struct mm_struct *mm)
57 pte = pte_alloc_one_kernel(mm);
60 page = virt_to_page(pte);
61 if (!pgtable_page_ctor(page)) {
68 static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
70 free_page((unsigned long)pte);
73 static inline void pte_free(struct mm_struct *mm, pgtable_t pte)
75 pgtable_page_dtor(pte);
78 #define pmd_pgtable(pmd) pmd_page(pmd)
80 #endif /* _XTENSA_PGALLOC_H */