Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1/*
2 * include/asm-xtensa/pgalloc.h
3 *
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.
7 *
8 * Copyright (C) 2001-2007 Tensilica Inc.
9 */
10
11#ifndef _XTENSA_PGALLOC_H
12#define _XTENSA_PGALLOC_H
13
14#ifdef __KERNEL__
15
16#include <linux/highmem.h>
17
18/*
19 * Allocating and freeing a pmd is trivial: the 1-entry pmd is
20 * inside the pgd, so has no extra memory associated with it.
21 */
22
23#define pmd_populate_kernel(mm, pmdp, ptep) \
24 (pmd_val(*(pmdp)) = ((unsigned long)ptep))
25#define pmd_populate(mm, pmdp, page) \
26 (pmd_val(*(pmdp)) = ((unsigned long)page_to_virt(page)))
27
28static inline pgd_t*
29pgd_alloc(struct mm_struct *mm)
30{
31 return (pgd_t*) __get_free_pages(GFP_KERNEL | __GFP_ZERO, PGD_ORDER);
32}
33
34static inline void pgd_free(pgd_t *pgd)
35{
36 free_page((unsigned long)pgd);
37}
38
39/* Use a slab cache for the pte pages (see also sparc64 implementation) */
40
41extern struct kmem_cache *pgtable_cache;
42
43static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
44 unsigned long address)
45{
46 return kmem_cache_alloc(pgtable_cache, GFP_KERNEL|__GFP_REPEAT);
47}
48
49static inline struct page *pte_alloc_one(struct mm_struct *mm,
50 unsigned long addr)
51{
52 return virt_to_page(pte_alloc_one_kernel(mm, addr));
53}
54
55static inline void pte_free_kernel(pte_t *pte)
56{
57 kmem_cache_free(pgtable_cache, pte);
58}
59
60static inline void pte_free(struct page *page)
61{
62 kmem_cache_free(pgtable_cache, page_address(page));
63}
64
65#endif /* __KERNEL__ */
66#endif /* _XTENSA_PGALLOC_H */