alistair23-linux/arch/nios2/include/asm/pgalloc.h

/*
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 1994 - 2001, 2003 by Ralf Baechle
 * Copyright (C) 1999, 2000, 2001 Silicon Graphics, Inc.
 */

#ifndef _ASM_NIOS2_PGALLOC_H
#define _ASM_NIOS2_PGALLOC_H

#include <linux/mm.h>

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)

/*
 * Initialize a new pmd table with invalid pointers.
 */
extern void pmd_init(unsigned long page, unsigned long pagetable);

extern pgd_t *pgd_alloc(struct mm_struct *mm);

static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
{
	free_pages((unsigned long)pgd, PGD_ORDER);
}

static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm)
{
	pte_t *pte;

	pte = (pte_t *) __get_free_pages(GFP_KERNEL|__GFP_ZERO, PTE_ORDER);

	return pte;
}

static inline pgtable_t pte_alloc_one(struct mm_struct *mm)
{
	struct page *pte;

	pte = alloc_pages(GFP_KERNEL, PTE_ORDER);
	if (pte) {
		if (!pgtable_page_ctor(pte)) {
			__free_page(pte);
			return NULL;
		}
		clear_highpage(pte);
	}
	return pte;
}

static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
{
	free_pages((unsigned long)pte, PTE_ORDER);
}

static inline void pte_free(struct mm_struct *mm, struct page *pte)
{
	pgtable_page_dtor(pte);
	__free_pages(pte, PTE_ORDER);
}

#define __pte_free_tlb(tlb, pte, addr)				\
	do {							\
		pgtable_page_dtor(pte);				\
		tlb_remove_page((tlb), (pte));			\
	} while (0)

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

#endif /* _ASM_NIOS2_PGALLOC_H */