arch/arm/include/asm/pgtable-2level.h

/*
 *  arch/arm/include/asm/pgtable-2level.h
 *
 *  Copyright (C) 1995-2002 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 _ASM_PGTABLE_2LEVEL_H
#define _ASM_PGTABLE_2LEVEL_H

#define PTRS_PER_PTE		512
#define PTRS_PER_PMD		1
#define PTRS_PER_PGD		2048

#define PTE_HWTABLE_PTRS	(PTRS_PER_PTE)
#define PTE_HWTABLE_OFF		(PTE_HWTABLE_PTRS * sizeof(pte_t))
#define PTE_HWTABLE_SIZE	(PTRS_PER_PTE * sizeof(u32))

#define PMD_SHIFT		21
#define PGDIR_SHIFT		21

#define PMD_SIZE		(1UL << PMD_SHIFT)
#define PMD_MASK		(~(PMD_SIZE-1))
#define PGDIR_SIZE		(1UL << PGDIR_SHIFT)
#define PGDIR_MASK		(~(PGDIR_SIZE-1))

#define SECTION_SHIFT		20
#define SECTION_SIZE		(1UL << SECTION_SHIFT)
#define SECTION_MASK		(~(SECTION_SIZE-1))

#define SUPERSECTION_SHIFT	24
#define SUPERSECTION_SIZE	(1UL << SUPERSECTION_SHIFT)
#define SUPERSECTION_MASK	(~(SUPERSECTION_SIZE-1))

#define USER_PTRS_PER_PGD	(TASK_SIZE / PGDIR_SIZE)

#define L_PTE_PRESENT		(_AT(pteval_t, 1) << 0)
#define L_PTE_YOUNG		(_AT(pteval_t, 1) << 1)
#define L_PTE_FILE		(_AT(pteval_t, 1) << 2)	
#define L_PTE_DIRTY		(_AT(pteval_t, 1) << 6)
#define L_PTE_RDONLY		(_AT(pteval_t, 1) << 7)
#define L_PTE_USER		(_AT(pteval_t, 1) << 8)
#define L_PTE_XN		(_AT(pteval_t, 1) << 9)
#define L_PTE_SHARED		(_AT(pteval_t, 1) << 10)	

#define L_PTE_MT_UNCACHED	(_AT(pteval_t, 0x00) << 2)	
#define L_PTE_MT_BUFFERABLE	(_AT(pteval_t, 0x01) << 2)	
#define L_PTE_MT_WRITETHROUGH	(_AT(pteval_t, 0x02) << 2)	
#define L_PTE_MT_WRITEBACK	(_AT(pteval_t, 0x03) << 2)	
#define L_PTE_MT_MINICACHE	(_AT(pteval_t, 0x06) << 2)	
#define L_PTE_MT_WRITEALLOC	(_AT(pteval_t, 0x07) << 2)	
#define L_PTE_MT_DEV_SHARED	(_AT(pteval_t, 0x04) << 2)	
#define L_PTE_MT_DEV_NONSHARED	(_AT(pteval_t, 0x0c) << 2)	
#define L_PTE_MT_DEV_WC		(_AT(pteval_t, 0x09) << 2)	
#define L_PTE_MT_DEV_CACHED	(_AT(pteval_t, 0x0b) << 2)	
#define L_PTE_MT_MASK		(_AT(pteval_t, 0x0f) << 2)

#ifndef __ASSEMBLY__

#define pud_none(pud)		(0)
#define pud_bad(pud)		(0)
#define pud_present(pud)	(1)
#define pud_clear(pudp)		do { } while (0)
#define set_pud(pud,pudp)	do { } while (0)

static inline pmd_t *pmd_offset(pud_t *pud, unsigned long addr)
{
	return (pmd_t *)pud;
}

#define pmd_bad(pmd)		(pmd_val(pmd) & 2)

#define copy_pmd(pmdpd,pmdps)		\
	do {				\
		pmdpd[0] = pmdps[0];	\
		pmdpd[1] = pmdps[1];	\
		flush_pmd_entry(pmdpd);	\
	} while (0)

#define pmd_clear(pmdp)			\
	do {				\
		pmdp[0] = __pmd(0);	\
		pmdp[1] = __pmd(0);	\
		clean_pmd_entry(pmdp);	\
	} while (0)

#define pmd_addr_end(addr,end) (end)

#define set_pte_ext(ptep,pte,ext) cpu_set_pte_ext(ptep,pte,ext)

#endif 

#endif