2 * arch/arm/include/asm/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/domain.h>
14 #include <asm/pgtable-hwdef.h>
15 #include <asm/processor.h>
16 #include <asm/cacheflush.h>
17 #include <asm/tlbflush.h>
19 #define check_pgt_cache() do { } while (0)
23 #define _PAGE_USER_TABLE (PMD_TYPE_TABLE | PMD_BIT4 | PMD_DOMAIN(DOMAIN_USER))
24 #define _PAGE_KERNEL_TABLE (PMD_TYPE_TABLE | PMD_BIT4 | PMD_DOMAIN(DOMAIN_KERNEL))
27 * Since we have only two-level page tables, these are trivial
29 #define pmd_alloc_one(mm,addr) ({ BUG(); ((pmd_t *)2); })
30 #define pmd_free(mm, pmd) do { } while (0)
31 #define pgd_populate(mm,pmd,pte) BUG()
33 extern pgd_t *pgd_alloc(struct mm_struct *mm);
34 extern void pgd_free(struct mm_struct *mm, pgd_t *pgd);
36 #define PGALLOC_GFP (GFP_KERNEL | __GFP_NOTRACK | __GFP_REPEAT | __GFP_ZERO)
38 static inline void clean_pte_table(pte_t *pte)
40 clean_dcache_area(pte + PTE_HWTABLE_PTRS, PTE_HWTABLE_SIZE);
44 * Allocate one PTE table.
46 * This actually allocates two hardware PTE tables, but we wrap this up
47 * into one table thus:
60 pte_alloc_one_kernel(struct mm_struct *mm, unsigned long addr)
64 pte = (pte_t *)__get_free_page(PGALLOC_GFP);
71 static inline pgtable_t
72 pte_alloc_one(struct mm_struct *mm, unsigned long addr)
77 pte = alloc_pages(PGALLOC_GFP | __GFP_HIGHMEM, 0);
79 pte = alloc_pages(PGALLOC_GFP, 0);
82 if (!PageHighMem(pte))
83 clean_pte_table(page_address(pte));
84 pgtable_page_ctor(pte);
93 static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
96 free_page((unsigned long)pte);
99 static inline void pte_free(struct mm_struct *mm, pgtable_t pte)
101 pgtable_page_dtor(pte);
105 static inline void __pmd_populate(pmd_t *pmdp, phys_addr_t pte,
108 unsigned long pmdval = (pte + PTE_HWTABLE_OFF) | prot;
109 pmdp[0] = __pmd(pmdval);
110 pmdp[1] = __pmd(pmdval + 256 * sizeof(pte_t));
111 flush_pmd_entry(pmdp);
115 * Populate the pmdp entry with a pointer to the pte. This pmd is part
116 * of the mm address space.
118 * Ensure that we always set both PMD entries.
121 pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmdp, pte_t *ptep)
124 * The pmd must be loaded with the physical address of the PTE table
126 __pmd_populate(pmdp, __pa(ptep), _PAGE_KERNEL_TABLE);
130 pmd_populate(struct mm_struct *mm, pmd_t *pmdp, pgtable_t ptep)
132 __pmd_populate(pmdp, page_to_phys(ptep), _PAGE_USER_TABLE);
134 #define pmd_pgtable(pmd) pmd_page(pmd)
136 #endif /* CONFIG_MMU */