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/*
 * page.h
 *
 *	PowerPC memory management structures
 *
 * It is a stripped down version of linux ppc file...
 *
 * Copyright (C) 1999  Eric Valette (valette@crf.canon.fr)
 *                     Canon Centre Recherche France.
 *
 *  The license and distribution terms for this file may be
 *  found in found in the file LICENSE in this distribution or at
 *  http://www.OARcorp.com/rtems/license.html.
 *
 *  $Id: page.h,v 1.2 2001-09-27 12:01:30 chris Exp $
 */
 
#ifndef _PPC_PAGE_H
#define _PPC_PAGE_H
 
/* PAGE_SHIFT determines the page size */
#define PAGE_SHIFT	12
#define PAGE_SIZE	(1UL << PAGE_SHIFT)
#define PAGE_MASK	(~(PAGE_SIZE-1))
 
#define PAGE_OFFSET	0xc0000000
 
 
#ifndef ASM
/*
 * .. while these make it easier on the compiler
 */
typedef unsigned long pte_t;
typedef unsigned long pmd_t;
typedef unsigned long pgd_t;
typedef unsigned long pgprot_t;
 
#define pte_val(x)	(x)
#define pmd_val(x)	(x)
#define pgd_val(x)	(x)
#define pgprot_val(x)	(x)
 
#define __pte(x)	(x)
#define __pmd(x)	(x)
#define __pgd(x)	(x)
#define __pgprot(x)	(x)
 
 
/* align addr on a size boundry - adjust address up if needed -- Cort */
#define _ALIGN(addr,size)	(((addr)+size-1)&(~(size-1)))
 
/* to align the pointer to the (next) page boundary */
#define PAGE_ALIGN(addr)	(((addr)+PAGE_SIZE-1)&PAGE_MASK)
 
 
#define clear_page(page)        memset((void *)(page), 0, PAGE_SIZE)
#define copy_page(to,from)	memcpy((void *)(to), (void *)(from), PAGE_SIZE)
/* map phys->virtual and virtual->phys for RAM pages */
 
#define __pa(x)			((unsigned long)(x)-PAGE_OFFSET)
#define __va(x)			((void *)((unsigned long)(x)+PAGE_OFFSET))
 
#define MAP_NR(addr)		(((unsigned long)addr-PAGE_OFFSET) >> PAGE_SHIFT)
#define MAP_PAGE_RESERVED	(1<<15)
 
extern unsigned long get_zero_page_fast(void);
#endif /* ASM */
#endif /* _PPC_PAGE_H */