5a4d529277
Use a quicklist to allocate process PGDs. This is expected to be slightly faster since we need to copy entries from swapper_pg_dir, which can stay around for pages on the PGD quick list. Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>
97 lines
2.1 KiB
C
97 lines
2.1 KiB
C
/*
|
|
* Copyright (C) 2004-2006 Atmel Corporation
|
|
*
|
|
* 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 __ASM_AVR32_PGALLOC_H
|
|
#define __ASM_AVR32_PGALLOC_H
|
|
|
|
#include <linux/quicklist.h>
|
|
#include <asm/page.h>
|
|
#include <asm/pgtable.h>
|
|
|
|
#define QUICK_PGD 0 /* Preserve kernel mappings over free */
|
|
|
|
static inline void pmd_populate_kernel(struct mm_struct *mm,
|
|
pmd_t *pmd, pte_t *pte)
|
|
{
|
|
set_pmd(pmd, __pmd((unsigned long)pte));
|
|
}
|
|
|
|
static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
|
|
pgtable_t pte)
|
|
{
|
|
set_pmd(pmd, __pmd((unsigned long)page_address(pte)));
|
|
}
|
|
#define pmd_pgtable(pmd) pmd_page(pmd)
|
|
|
|
static inline void pgd_ctor(void *x)
|
|
{
|
|
pgd_t *pgd = x;
|
|
|
|
memcpy(pgd + USER_PTRS_PER_PGD,
|
|
swapper_pg_dir + USER_PTRS_PER_PGD,
|
|
(PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
|
|
}
|
|
|
|
/*
|
|
* Allocate and free page tables
|
|
*/
|
|
static inline pgd_t *pgd_alloc(struct mm_struct *mm)
|
|
{
|
|
return quicklist_alloc(QUICK_PGD, GFP_KERNEL | __GFP_REPEAT, pgd_ctor);
|
|
}
|
|
|
|
static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
|
|
{
|
|
quicklist_free(QUICK_PGD, NULL, pgd);
|
|
}
|
|
|
|
static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
|
|
unsigned long address)
|
|
{
|
|
pte_t *pte;
|
|
|
|
pte = (pte_t *)get_zeroed_page(GFP_KERNEL | __GFP_REPEAT);
|
|
|
|
return pte;
|
|
}
|
|
|
|
static inline struct page *pte_alloc_one(struct mm_struct *mm,
|
|
unsigned long address)
|
|
{
|
|
struct page *pte;
|
|
|
|
pte = alloc_page(GFP_KERNEL | __GFP_REPEAT | __GFP_ZERO);
|
|
if (!pte)
|
|
return NULL;
|
|
pgtable_page_ctor(pte);
|
|
return pte;
|
|
}
|
|
|
|
static inline void pte_free_kernel(struct mm_struct *mm, pte_t *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);
|
|
}
|
|
|
|
#define __pte_free_tlb(tlb,pte) \
|
|
do { \
|
|
pgtable_page_dtor(pte); \
|
|
tlb_remove_page((tlb), pte); \
|
|
} while (0)
|
|
|
|
static inline void check_pgt_cache(void)
|
|
{
|
|
quicklist_trim(QUICK_PGD, NULL, 25, 16);
|
|
}
|
|
|
|
#endif /* __ASM_AVR32_PGALLOC_H */
|