2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
6 * Copyright (C) 1994 - 2001, 2003 by Ralf Baechle
7 * Copyright (C) 1999, 2000, 2001 Silicon Graphics, Inc.
10 #define _ASM_PGALLOC_H
12 #include <linux/highmem.h>
14 #include <linux/sched.h>
16 static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd,
19 set_pmd(pmd, __pmd((unsigned long)pte));
22 static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
25 set_pmd(pmd, __pmd((unsigned long)page_address(pte)));
29 * Initialize a new pmd table with invalid pointers.
31 extern void pmd_init(unsigned long page, unsigned long pagetable);
35 static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
37 set_pud(pud, __pud((unsigned long)pmd));
42 * Initialize a new pgd / pmd table with invalid pointers.
44 extern void pgd_init(unsigned long page);
46 static inline pgd_t *pgd_alloc(struct mm_struct *mm)
50 ret = (pgd_t *) __get_free_pages(GFP_KERNEL, PGD_ORDER);
52 init = pgd_offset(&init_mm, 0UL);
53 pgd_init((unsigned long)ret);
54 memcpy(ret + USER_PTRS_PER_PGD, init + USER_PTRS_PER_PGD,
55 (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
61 static inline void pgd_free(pgd_t *pgd)
63 free_pages((unsigned long)pgd, PGD_ORDER);
66 static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
67 unsigned long address)
71 pte = (pte_t *) __get_free_pages(GFP_KERNEL|__GFP_REPEAT|__GFP_ZERO, PTE_ORDER);
76 static inline struct page *pte_alloc_one(struct mm_struct *mm,
77 unsigned long address)
81 pte = alloc_pages(GFP_KERNEL | __GFP_REPEAT, PTE_ORDER);
88 static inline void pte_free_kernel(pte_t *pte)
90 free_pages((unsigned long)pte, PTE_ORDER);
93 static inline void pte_free(struct page *pte)
95 __free_pages(pte, PTE_ORDER);
98 #define __pte_free_tlb(tlb, pte) tlb_remove_page((tlb), (pte))
103 * allocating and freeing a pmd is trivial: the 1-entry pmd is
104 * inside the pgd, so has no extra memory associated with it.
106 #define pmd_free(x) do { } while (0)
107 #define __pmd_free_tlb(tlb, x) do { } while (0)
113 static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address)
117 pmd = (pmd_t *) __get_free_pages(GFP_KERNEL|__GFP_REPEAT, PMD_ORDER);
119 pmd_init((unsigned long)pmd, (unsigned long)invalid_pte_table);
123 static inline void pmd_free(pmd_t *pmd)
125 free_pages((unsigned long)pmd, PMD_ORDER);
128 #define __pmd_free_tlb(tlb, x) pmd_free(x)
132 #define check_pgt_cache() do { } while (0)
134 extern void pagetable_init(void);
136 #endif /* _ASM_PGALLOC_H */