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/
usr/
src/
linux-headers-3.0.0-14/
arch/
arm/
include/
asm/
- drwxr-xr-x
|
Viewing file:  pgalloc.h (3.12 KB) -rw-r--r--Select action/file-type:  ( +) |  ( +) |  ( +) | Code ( +) | Session ( +) |  ( +) | SDB ( +) |  ( +) |  ( +) |  ( +) |  ( +) |  ( +) |
/*
* 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 <linux/pagemap.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 *pgd_alloc(struct mm_struct *mm);
extern void pgd_free(struct mm_struct *mm, pgd_t *pgd);
#define PGALLOC_GFP (GFP_KERNEL | __GFP_NOTRACK | __GFP_REPEAT | __GFP_ZERO)
static inline void clean_pte_table(pte_t *pte)
{
clean_dcache_area(pte + PTE_HWTABLE_PTRS, PTE_HWTABLE_SIZE);
}
/*
* Allocate one PTE table.
*
* This actually allocates two hardware PTE tables, but we wrap this up
* into one table thus:
*
* +------------+
* | Linux pt 0 |
* +------------+
* | Linux pt 1 |
* +------------+
* | h/w pt 0 |
* +------------+
* | h/w 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(PGALLOC_GFP);
if (pte)
clean_pte_table(pte);
return pte;
}
static inline pgtable_t
pte_alloc_one(struct mm_struct *mm, unsigned long addr)
{
struct page *pte;
#ifdef CONFIG_HIGHPTE
pte = alloc_pages(PGALLOC_GFP | __GFP_HIGHMEM, 0);
#else
pte = alloc_pages(PGALLOC_GFP, 0);
#endif
if (pte) {
if (!PageHighMem(pte))
clean_pte_table(page_address(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)
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, phys_addr_t pte,
unsigned long prot)
{
unsigned long pmdval = (pte + PTE_HWTABLE_OFF) | prot;
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)
{
/*
* The pmd must be loaded with the physical address of the PTE table
*/
__pmd_populate(pmdp, __pa(ptep), _PAGE_KERNEL_TABLE);
}
static inline void
pmd_populate(struct mm_struct *mm, pmd_t *pmdp, pgtable_t ptep)
{
__pmd_populate(pmdp, page_to_phys(ptep), _PAGE_USER_TABLE);
}
#define pmd_pgtable(pmd) pmd_page(pmd)
#endif /* CONFIG_MMU */
#endif
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