5e5419734c
(with Martin Schwidefsky <schwidefsky@de.ibm.com>) The pgd/pud/pmd/pte page table allocation functions get a mm_struct pointer as first argument. The free functions do not get the mm_struct argument. This is 1) asymmetrical and 2) to do mm related page table allocations the mm argument is needed on the free function as well. [kamalesh@linux.vnet.ibm.com: i386 fix] [akpm@linux-foundation.org: coding-syle fixes] Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: <linux-arch@vger.kernel.org> Signed-off-by: Kamalesh Babulal <kamalesh@linux.vnet.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
134 lines
3 KiB
C
134 lines
3 KiB
C
/*
|
|
* linux/include/asm-arm/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 struct page *
|
|
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);
|
|
}
|
|
|
|
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, struct page *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, struct page *ptep)
|
|
{
|
|
__pmd_populate(pmdp, page_to_pfn(ptep) << PAGE_SHIFT | _PAGE_USER_TABLE);
|
|
}
|
|
|
|
#endif /* CONFIG_MMU */
|
|
|
|
#endif
|