diff options
author | Ben Dooks <ben-linux@fluff.org> | 2008-08-08 21:10:12 +0100 |
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committer | Ben Dooks <ben-linux@fluff.org> | 2008-08-08 21:10:12 +0100 |
commit | af7a535688a758d15f06a98833e6a143b29af9de (patch) | |
tree | bac5ab210bbbbe276f0e44ed84194d7c8bb16aae /arch/arm/include/asm/pgalloc.h | |
parent | 0c17e4ceedd35c78b1c7413dbd16279a350be6bc (diff) | |
parent | c41107c2d4fd31924533f4dbc4c3428acc2b5894 (diff) |
Merge http://ftp.arm.linux.org.uk/pub/linux/arm/kernel/git-cur/linux-2.6-arm into for-rmk
Diffstat (limited to 'arch/arm/include/asm/pgalloc.h')
-rw-r--r-- | arch/arm/include/asm/pgalloc.h | 136 |
1 files changed, 136 insertions, 0 deletions
diff --git a/arch/arm/include/asm/pgalloc.h b/arch/arm/include/asm/pgalloc.h new file mode 100644 index 00000000000..3dcd64bf182 --- /dev/null +++ b/arch/arm/include/asm/pgalloc.h @@ -0,0 +1,136 @@ +/* + * arch/arm/include/asm/pgalloc.h + * + * Copyright (C) 2000-2001 Russell King + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ +#ifndef _ASMARM_PGALLOC_H +#define _ASMARM_PGALLOC_H + +#include <asm/domain.h> +#include <asm/pgtable-hwdef.h> +#include <asm/processor.h> +#include <asm/cacheflush.h> +#include <asm/tlbflush.h> + +#define check_pgt_cache() do { } while (0) + +#ifdef CONFIG_MMU + +#define _PAGE_USER_TABLE (PMD_TYPE_TABLE | PMD_BIT4 | PMD_DOMAIN(DOMAIN_USER)) +#define _PAGE_KERNEL_TABLE (PMD_TYPE_TABLE | PMD_BIT4 | PMD_DOMAIN(DOMAIN_KERNEL)) + +/* + * Since we have only two-level page tables, these are trivial + */ +#define pmd_alloc_one(mm,addr) ({ BUG(); ((pmd_t *)2); }) +#define pmd_free(mm, pmd) do { } while (0) +#define pgd_populate(mm,pmd,pte) BUG() + +extern pgd_t *get_pgd_slow(struct mm_struct *mm); +extern void free_pgd_slow(struct mm_struct *mm, pgd_t *pgd); + +#define pgd_alloc(mm) get_pgd_slow(mm) +#define pgd_free(mm, pgd) free_pgd_slow(mm, pgd) + +/* + * Allocate one PTE table. + * + * This actually allocates two hardware PTE tables, but we wrap this up + * into one table thus: + * + * +------------+ + * | h/w pt 0 | + * +------------+ + * | h/w pt 1 | + * +------------+ + * | Linux pt 0 | + * +------------+ + * | Linux pt 1 | + * +------------+ + */ +static inline pte_t * +pte_alloc_one_kernel(struct mm_struct *mm, unsigned long addr) +{ + pte_t *pte; + + pte = (pte_t *)__get_free_page(GFP_KERNEL|__GFP_REPEAT|__GFP_ZERO); + if (pte) { + clean_dcache_area(pte, sizeof(pte_t) * PTRS_PER_PTE); + pte += PTRS_PER_PTE; + } + + return pte; +} + +static inline pgtable_t +pte_alloc_one(struct mm_struct *mm, unsigned long addr) +{ + struct page *pte; + + pte = alloc_pages(GFP_KERNEL|__GFP_REPEAT|__GFP_ZERO, 0); + if (pte) { + void *page = page_address(pte); + clean_dcache_area(page, sizeof(pte_t) * PTRS_PER_PTE); + pgtable_page_ctor(pte); + } + + return pte; +} + +/* + * Free one PTE table. + */ +static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte) +{ + if (pte) { + pte -= PTRS_PER_PTE; + free_page((unsigned long)pte); + } +} + +static inline void pte_free(struct mm_struct *mm, pgtable_t pte) +{ + pgtable_page_dtor(pte); + __free_page(pte); +} + +static inline void __pmd_populate(pmd_t *pmdp, unsigned long pmdval) +{ + pmdp[0] = __pmd(pmdval); + pmdp[1] = __pmd(pmdval + 256 * sizeof(pte_t)); + flush_pmd_entry(pmdp); +} + +/* + * Populate the pmdp entry with a pointer to the pte. This pmd is part + * of the mm address space. + * + * Ensure that we always set both PMD entries. + */ +static inline void +pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmdp, pte_t *ptep) +{ + unsigned long pte_ptr = (unsigned long)ptep; + + /* + * The pmd must be loaded with the physical + * address of the PTE table + */ + pte_ptr -= PTRS_PER_PTE * sizeof(void *); + __pmd_populate(pmdp, __pa(pte_ptr) | _PAGE_KERNEL_TABLE); +} + +static inline void +pmd_populate(struct mm_struct *mm, pmd_t *pmdp, pgtable_t ptep) +{ + __pmd_populate(pmdp, page_to_pfn(ptep) << PAGE_SHIFT | _PAGE_USER_TABLE); +} +#define pmd_pgtable(pmd) pmd_page(pmd) + +#endif /* CONFIG_MMU */ + +#endif |