2 * linux/include/asm-arm/pgalloc.h
4 * Copyright (C) 2000-2001 Russell King
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
10 #ifndef _ASMARM_PGALLOC_H
11 #define _ASMARM_PGALLOC_H
13 #include <asm/processor.h>
14 #include <asm/cacheflush.h>
15 #include <asm/tlbflush.h>
18 * Since we have only two-level page tables, these are trivial
20 #define pmd_alloc_one(mm,addr) ({ BUG(); ((pmd_t *)2); })
21 #define pmd_free(pmd) do { } while (0)
22 #define pgd_populate(mm,pmd,pte) BUG()
24 extern pgd_t *get_pgd_slow(struct mm_struct *mm);
25 extern void free_pgd_slow(pgd_t *pgd);
27 #define pgd_alloc(mm) get_pgd_slow(mm)
28 #define pgd_free(pgd) free_pgd_slow(pgd)
30 #define check_pgt_cache() do { } while (0)
33 * Allocate one PTE table.
35 * This actually allocates two hardware PTE tables, but we wrap this up
36 * into one table thus:
49 pte_alloc_one_kernel(struct mm_struct *mm, unsigned long addr)
53 pte = (pte_t *)__get_free_page(GFP_KERNEL|__GFP_REPEAT);
56 clean_dcache_area(pte, sizeof(pte_t) * PTRS_PER_PTE);
63 static inline struct page *
64 pte_alloc_one(struct mm_struct *mm, unsigned long addr)
68 pte = alloc_pages(GFP_KERNEL|__GFP_REPEAT, 0);
70 void *page = page_address(pte);
72 clean_dcache_area(page, sizeof(pte_t) * PTRS_PER_PTE);
81 static inline void pte_free_kernel(pte_t *pte)
85 free_page((unsigned long)pte);
89 static inline void pte_free(struct page *pte)
95 * Populate the pmdp entry with a pointer to the pte. This pmd is part
96 * of the mm address space.
98 * Ensure that we always set both PMD entries.
101 pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmdp, pte_t *ptep)
103 unsigned long pte_ptr = (unsigned long)ptep;
104 unsigned long pmdval;
106 BUG_ON(mm != &init_mm);
109 * The pmd must be loaded with the physical
110 * address of the PTE table
112 pte_ptr -= PTRS_PER_PTE * sizeof(void *);
113 pmdval = __pa(pte_ptr) | _PAGE_KERNEL_TABLE;
114 pmdp[0] = __pmd(pmdval);
115 pmdp[1] = __pmd(pmdval + 256 * sizeof(pte_t));
116 flush_pmd_entry(pmdp);
120 pmd_populate(struct mm_struct *mm, pmd_t *pmdp, struct page *ptep)
122 unsigned long pmdval;
124 BUG_ON(mm == &init_mm);
126 pmdval = page_to_pfn(ptep) << PAGE_SHIFT | _PAGE_USER_TABLE;
127 pmdp[0] = __pmd(pmdval);
128 pmdp[1] = __pmd(pmdval + 256 * sizeof(pte_t));
129 flush_pmd_entry(pmdp);