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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 */