da02877987
This patch modifies the pgd/pmd/pte manipulation functions to support the 3-level page table format. Since there is no need for an 'ext' argument to cpu_set_pte_ext(), this patch conditionally defines a different prototype for this function when CONFIG_ARM_LPAE. The patch also introduces the L_PGD_SWAPPER flag to mark pgd entries pointing to pmd tables pre-allocated in the swapper_pg_dir and avoid trying to free them at run-time. This flag is 0 with the classic page table format. Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
165 lines
3.6 KiB
C
165 lines
3.6 KiB
C
/*
|
|
* 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))
|
|
|
|
#ifdef CONFIG_ARM_LPAE
|
|
|
|
static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr)
|
|
{
|
|
return (pmd_t *)get_zeroed_page(GFP_KERNEL | __GFP_REPEAT);
|
|
}
|
|
|
|
static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
|
|
{
|
|
BUG_ON((unsigned long)pmd & (PAGE_SIZE-1));
|
|
free_page((unsigned long)pmd);
|
|
}
|
|
|
|
static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
|
|
{
|
|
set_pud(pud, __pud(__pa(pmd) | PMD_TYPE_TABLE));
|
|
}
|
|
|
|
#else /* !CONFIG_ARM_LPAE */
|
|
|
|
/*
|
|
* 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 pud_populate(mm,pmd,pte) BUG()
|
|
|
|
#endif /* CONFIG_ARM_LPAE */
|
|
|
|
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,
|
|
pmdval_t prot)
|
|
{
|
|
pmdval_t pmdval = (pte + PTE_HWTABLE_OFF) | prot;
|
|
pmdp[0] = __pmd(pmdval);
|
|
#ifndef CONFIG_ARM_LPAE
|
|
pmdp[1] = __pmd(pmdval + 256 * sizeof(pte_t));
|
|
#endif
|
|
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
|