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/* $Id: page.h,v 1.9 2000/02/24 00:13:19 ralf Exp $
*
* Definitions for page handling
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Copyright (C) 1994 - 1999 by Ralf Baechle
*/
#ifndef __ASM_PAGE_H
#define __ASM_PAGE_H
/* PAGE_SHIFT determines the page size */
#define PAGE_SHIFT 12
#define PAGE_SIZE (1UL << PAGE_SHIFT)
#define PAGE_MASK (~(PAGE_SIZE-1))
#ifdef __KERNEL__
#ifndef _LANGUAGE_ASSEMBLY
#define BUG() do { printk("kernel BUG at %s:%d!\n", __FILE__, __LINE__); *(int *)0=0; } while (0)
#define PAGE_BUG(page) do { BUG(); } while (0)
extern void (*_clear_page)(void * page);
extern void (*_copy_page)(void * to, void * from);
#define clear_page(page) _clear_page(page)
#define copy_page(to, from) _copy_page(to, from)
#define clear_user_page(page, vaddr) clear_page(page)
#define copy_user_page(to, from, vaddr) copy_page(to, from)
/*
* These are used to make use of C type-checking..
*/
typedef struct { unsigned long pte; } pte_t;
typedef struct { unsigned long pmd; } pmd_t;
typedef struct { unsigned long pgd; } pgd_t;
typedef struct { unsigned long pgprot; } pgprot_t;
#define pte_val(x) ((x).pte)
#define pmd_val(x) ((x).pmd)
#define pgd_val(x) ((x).pgd)
#define pgprot_val(x) ((x).pgprot)
#define __pte(x) ((pte_t) { (x) } )
#define __pme(x) ((pme_t) { (x) } )
#define __pgd(x) ((pgd_t) { (x) } )
#define __pgprot(x) ((pgprot_t) { (x) } )
/* Pure 2^n version of get_order */
extern __inline__ int get_order(unsigned long size)
{
int order;
size = (size-1) >> (PAGE_SHIFT-1);
order = -1;
do {
size >>= 1;
order++;
} while (size);
return order;
}
#endif /* _LANGUAGE_ASSEMBLY */
/* to align the pointer to the (next) page boundary */
#define PAGE_ALIGN(addr) (((addr)+PAGE_SIZE-1)&PAGE_MASK)
/*
* This handles the memory map.
* We handle pages at KSEG0 for kernels with 32 bit address space.
*/
#define PAGE_OFFSET 0x80000000UL
#define __pa(x) ((unsigned long) (x) - PAGE_OFFSET)
#define __va(x) ((void *)((unsigned long) (x) + PAGE_OFFSET))
#define virt_to_page(kaddr) (mem_map + (__pa(kaddr) >> PAGE_SHIFT))
#define VALID_PAGE(page) ((page - mem_map) < max_mapnr)
#endif /* defined (__KERNEL__) */
#endif /* __ASM_PAGE_H */
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