text: /*
   * include/asm-v850/page.h -- VM ops
   *
   *  Copyright (C) 2001,02,03  NEC Electronics Corporation
   *  Copyright (C) 2001,02,03  Miles Bader <miles@gnu.org>
   *
   * 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.
   *
   * Written by Miles Bader <miles@gnu.org>
   */
  
  #ifndef __V850_PAGE_H__
  #define __V850_PAGE_H__
  
  #include <asm/machdep.h>
  
  
  #define PAGE_SHIFT	12
  #define PAGE_SIZE       (1UL << PAGE_SHIFT)
  #define PAGE_MASK       (~(PAGE_SIZE-1))
  
  
  /*
   * PAGE_OFFSET -- the first address of the first page of memory. For archs with
   * no MMU this corresponds to the first free page in physical memory (aligned
   * on a page boundary).
   */
  #ifndef PAGE_OFFSET
  #define PAGE_OFFSET  0x0000000
  #endif
  
  
  #ifdef __KERNEL__
  #ifndef __ASSEMBLY__
  
  #define STRICT_MM_TYPECHECKS
  
  #define clear_page(page)	memset ((void *)(page), 0, PAGE_SIZE)
  #define copy_page(to, from)	memcpy ((void *)(to), (void *)from, PAGE_SIZE)
  
  #define clear_user_page(addr, vaddr, page)	\
  	do { 	clear_page(addr);		\
  		flush_dcache_page(page);	\
  	} while (0)
  #define copy_user_page(to, from, vaddr, page)	\
  	do {	copy_page(to, from);		\
  		flush_dcache_page(page);	\
  	} while (0)
  
  #ifdef STRICT_MM_TYPECHECKS
  /*
   * 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 __pmd(x)        ((pmd_t) { (x) } )
  #define __pgd(x)        ((pgd_t) { (x) } )
  #define __pgprot(x)     ((pgprot_t) { (x) } )
  
  #else /* !STRICT_MM_TYPECHECKS */
  /*
   * .. 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)
  
  #endif /* STRICT_MM_TYPECHECKS */
  
  #endif /* !__ASSEMBLY__ */
  
  
  /* to align the pointer to the (next) page boundary */
  #define PAGE_ALIGN(addr)	(((addr) + PAGE_SIZE - 1) & PAGE_MASK)
  
  
  #ifndef __ASSEMBLY__
  
  /* 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 /* !__ASSEMBLY__ */
  
  
  /* No current v850 processor has virtual memory.  */
  #define __virt_to_phys(addr)	(addr)
  #define __phys_to_virt(addr)	(addr)
  
  #define virt_to_pfn(kaddr)	(__virt_to_phys (kaddr) >> PAGE_SHIFT)
  #define pfn_to_virt(pfn)	__phys_to_virt ((pfn) << PAGE_SHIFT)
  
  #define MAP_NR(kaddr) \
    (((unsigned long)(kaddr) - PAGE_OFFSET) >> PAGE_SHIFT)
  #define virt_to_page(kaddr)	(mem_map + MAP_NR (kaddr))
  #define page_to_virt(page) \
    ((((page) - mem_map) << PAGE_SHIFT) + PAGE_OFFSET)
  
  #define pfn_to_page(pfn)	virt_to_page (pfn_to_virt (pfn))
  #define page_to_pfn(page)	virt_to_pfn (page_to_virt (page))
  
  #define	virt_addr_valid(kaddr)						\
    (((void *)(kaddr) >= (void *)PAGE_OFFSET) && MAP_NR (kaddr) < max_mapnr)
  
  
  #define __pa(x)		     __virt_to_phys ((unsigned long)(x))
  #define __va(x)		     ((void *)__phys_to_virt ((unsigned long)(x)))
  
  
  #endif /* KERNEL */
  
  #endif /* __V850_PAGE_H__ */
  