/* pgtable.h: FR-V page table mangling
 *
 * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells (dhowells@redhat.com)
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version
 * 2 of the License, or (at your option) any later version.
 *
 * Derived from:
 *	include/asm-m68knommu/pgtable.h
 *	include/asm-i386/pgtable.h
 */

#ifndef _ASM_PGTABLE_H
#define _ASM_PGTABLE_H

#include <asm/mem-layout.h>
#include <asm/setup.h>
#include <asm/processor.h>

#ifndef __ASSEMBLY__
#include <linux/threads.h>
#include <linux/slab.h>
#include <linux/list.h>
#include <linux/spinlock.h>
#include <linux/sched.h>
struct vm_area_struct;
#endif

#ifndef __ASSEMBLY__
#if defined(CONFIG_HIGHPTE)
typedef unsigned long pte_addr_t;
#else
typedef pte_t *pte_addr_t;
#endif
#endif

/*****************************************************************************/
/*
 * MMU-less operation case first
 */
#ifndef CONFIG_MMU

#define pgd_present(pgd)	(1)		/* pages are always present on NO_MM */
#define pgd_none(pgd)		(0)
#define pgd_bad(pgd)		(0)
#define pgd_clear(pgdp)
#define kern_addr_valid(addr)	(1)
#define	pmd_offset(a, b)	((void *) 0)

#define PAGE_NONE		__pgprot(0)	/* these mean nothing to NO_MM */
#define PAGE_SHARED		__pgprot(0)	/* these mean nothing to NO_MM */
#define PAGE_COPY		__pgprot(0)	/* these mean nothing to NO_MM */
#define PAGE_READONLY		__pgprot(0)	/* these mean nothing to NO_MM */
#define PAGE_KERNEL		__pgprot(0)	/* these mean nothing to NO_MM */

#define __swp_type(x)		(0)
#define __swp_offset(x)		(0)
#define __swp_entry(typ,off)	((swp_entry_t) { ((typ) | ((off) << 7)) })
#define __pte_to_swp_entry(pte)	((swp_entry_t) { pte_val(pte) })
#define __swp_entry_to_pte(x)	((pte_t) { (x).val })

#ifndef __ASSEMBLY__
static inline int pte_file(pte_t pte) { return 0; }
#endif

#define ZERO_PAGE(vaddr)	({ BUG(); NULL; })

#define swapper_pg_dir		((pgd_t *) NULL)

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

#include <asm-generic/pgtable.h>

#else /* !CONFIG_MMU */
/*****************************************************************************/
/*
 * then MMU operation
 */

/*
 * ZERO_PAGE is a global shared page that is always zero: used
 * for zero-mapped memory areas etc..
 */
#ifndef __ASSEMBLY__
extern unsigned long empty_zero_page;
#define ZERO_PAGE(vaddr)	virt_to_page(empty_zero_page)
#endif

/*
 * we use 2-level page tables, folding the PMD (mid-level table) into the PGE (top-level entry)
 * [see Documentation/frv/mmu-layout.txt]
 *
 * Page Directory:
 *  - Size: 16KB
 *  - 64 PGEs per PGD