pgalloc.h

来自「linux 内核源代码」· C头文件 代码 · 共 73 行

/*
 * 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 <asm/processor.h>
#include <linux/threads.h>
#include <linux/slab.h>
#include <linux/mm.h>

#define pmd_populate_kernel(mm, pmd, pte) \
	set_pmd(pmd, __pmd(_PAGE_TABLE + __pa(pte)))

static __inline__ void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
				    struct page *pte)
{
	set_pmd(pmd, __pmd(_PAGE_TABLE + page_to_phys(pte)));
}

/*
 * Allocate and free page tables
 */
static __inline__ pgd_t *pgd_alloc(struct mm_struct *mm)
{
	return kcalloc(USER_PTRS_PER_PGD, sizeof(pgd_t), GFP_KERNEL);
}

static inline void pgd_free(pgd_t *pgd)
{
	kfree(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);

	return pte;
}

static inline void pte_free_kernel(pte_t *pte)
{
	free_page((unsigned long)pte);
}

static inline void pte_free(struct page *pte)
{
	__free_page(pte);
}

#define __pte_free_tlb(tlb,pte) tlb_remove_page((tlb),(pte))

#define check_pgt_cache() do { } while(0)

#endif /* __ASM_AVR32_PGALLOC_H */