2 * Based on arch/arm/include/asm/pgalloc.h
4 * Copyright (C) 2000-2001 Russell King
5 * Copyright (C) 2012 ARM Ltd.
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program. If not, see <http://www.gnu.org/licenses/>.
19 #ifndef __ASM_PGALLOC_H
20 #define __ASM_PGALLOC_H
22 #include <asm/pgtable-hwdef.h>
23 #include <asm/processor.h>
24 #include <asm/cacheflush.h>
25 #include <asm/tlbflush.h>
27 #define check_pgt_cache() do { } while (0)
29 #define PGALLOC_GFP (GFP_KERNEL | __GFP_NOTRACK | __GFP_REPEAT | __GFP_ZERO)
30 #define PGD_SIZE (PTRS_PER_PGD * sizeof(pgd_t))
32 #if CONFIG_PGTABLE_LEVELS > 2
34 static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr)
36 return (pmd_t *)__get_free_page(PGALLOC_GFP);
39 static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
41 BUG_ON((unsigned long)pmd & (PAGE_SIZE-1));
42 free_page((unsigned long)pmd);
45 static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
47 set_pud(pud, __pud(__pa(pmd) | PMD_TYPE_TABLE));
50 #endif /* CONFIG_PGTABLE_LEVELS > 2 */
52 #if CONFIG_PGTABLE_LEVELS > 3
54 static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr)
56 return (pud_t *)__get_free_page(PGALLOC_GFP);
59 static inline void pud_free(struct mm_struct *mm, pud_t *pud)
61 BUG_ON((unsigned long)pud & (PAGE_SIZE-1));
62 free_page((unsigned long)pud);
65 static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, pud_t *pud)
67 set_pgd(pgd, __pgd(__pa(pud) | PUD_TYPE_TABLE));
70 #endif /* CONFIG_PGTABLE_LEVELS > 3 */
72 extern pgd_t *pgd_alloc(struct mm_struct *mm);
73 extern void pgd_free(struct mm_struct *mm, pgd_t *pgd);
76 pte_alloc_one_kernel(struct mm_struct *mm, unsigned long addr)
78 return (pte_t *)__get_free_page(PGALLOC_GFP);
81 static inline pgtable_t
82 pte_alloc_one(struct mm_struct *mm, unsigned long addr)
86 pte = alloc_pages(PGALLOC_GFP, 0);
89 if (!pgtable_page_ctor(pte)) {
99 static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
102 free_page((unsigned long)pte);
105 static inline void pte_free(struct mm_struct *mm, pgtable_t pte)
107 pgtable_page_dtor(pte);
111 static inline void __pmd_populate(pmd_t *pmdp, phys_addr_t pte,
114 set_pmd(pmdp, __pmd(pte | prot));
118 * Populate the pmdp entry with a pointer to the pte. This pmd is part
119 * of the mm address space.
122 pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmdp, pte_t *ptep)
125 * The pmd must be loaded with the physical address of the PTE table
127 __pmd_populate(pmdp, __pa(ptep), PMD_TYPE_TABLE);
131 pmd_populate(struct mm_struct *mm, pmd_t *pmdp, pgtable_t ptep)
133 __pmd_populate(pmdp, page_to_phys(ptep), PMD_TYPE_TABLE);
135 #define pmd_pgtable(pmd) pmd_page(pmd)