page.h

RTEMS (Real-Time Executive for Multiprocessor Systems) is a free open source real-time operating sys

/*
 * page.h
 *
 *	PowerPC memory management structures
 *
 * It is a stripped down version of linux ppc file...
 *
 * Copyright (C) 1999  Eric Valette ([e-mail])
 *                     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.rtems.com/license/LICENSE.
 *
 *  $Id: page.h,v 1.1.6.1 2003/09/04 18:45:53 joel 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 */