text: /*
   *  arch/arm/include/asm/pgtable-nommu.h
   *
   *  Copyright (C) 1995-2002 Russell King
   *  Copyright (C) 2004  Hyok S. Choi
   *
   * This program is free software; you can redistribute it and/or modify
   * it under the terms of the GNU General Public License version 2 as
   * published by the Free Software Foundation.
   */
  #ifndef _ASMARM_PGTABLE_NOMMU_H
  #define _ASMARM_PGTABLE_NOMMU_H
  
  #ifndef __ASSEMBLY__
  
  #include <linux/slab.h>
  #include <asm/processor.h>
  #include <asm/page.h>
  
  /*
   * Trivial page table functions.
   */
  #define pgd_present(pgd)	(1)
  #define pgd_none(pgd)		(0)
  #define pgd_bad(pgd)		(0)
  #define pgd_clear(pgdp)
  #define kern_addr_valid(addr)	(1)
  #define	pmd_offset(a, b)	((void *)0)
  /* FIXME */
  /*
   * PMD_SHIFT determines the size of the area a second-level page table can map
   * PGDIR_SHIFT determines what a third-level page table entry can map
   */
  #define PGDIR_SHIFT		21
  
  #define PGDIR_SIZE		(1UL << PGDIR_SHIFT)
  #define PGDIR_MASK		(~(PGDIR_SIZE-1))
  /* FIXME */
  
  #define PAGE_NONE	__pgprot(0)
  #define PAGE_SHARED	__pgprot(0)
  #define PAGE_COPY	__pgprot(0)
  #define PAGE_READONLY	__pgprot(0)
  #define PAGE_KERNEL	__pgprot(0)
  
  #define swapper_pg_dir ((pgd_t *) 0)
  
  #define __swp_type(x)		(0)
  #define __swp_offset(x)		(0)
  #define __swp_entry(typ,off)	((swp_entry_t) { ((typ) | ((off) << 7)) })
  #define __pte_to_swp_entry(pte)	((swp_entry_t) { pte_val(pte) })
  #define __swp_entry_to_pte(x)	((pte_t) { (x).val })
  
  typedef pte_t *pte_addr_t;
  
  static inline int pte_file(pte_t pte) { return 0; }
  
  /*
   * ZERO_PAGE is a global shared page that is always zero: used
   * for zero-mapped memory areas etc..
   */
  #define ZERO_PAGE(vaddr)	(virt_to_page(0))
  
  /*
   * Mark the prot value as uncacheable and unbufferable.
   */
  #define pgprot_noncached(prot)	__pgprot(0)
  #define pgprot_writecombine(prot) __pgprot(0)
  #define pgprot_dmacoherent(prot) __pgprot(0)
  
  /*
   * These would be in other places but having them here reduces the diffs.
   */
  extern unsigned int kobjsize(const void *objp);
  
  /*
   * No page table caches to initialise.
   */
  #define pgtable_cache_init()	do { } while (0)
  #define io_remap_page_range	remap_page_range
  #define io_remap_pfn_range	remap_pfn_range
  
  /*
   * All 32bit addresses are effectively valid for vmalloc...
   * Sort of meaningless for non-VM targets.
   */
  #define	VMALLOC_START	0UL
  #define	VMALLOC_END	0xffffffffUL
  
  #define FIRST_USER_ADDRESS      (0)
  
  #include <asm-generic/pgtable.h>
  
  #else
  
  /*
   * dummy tlb and user structures.
   */
  #define v3_tlb_fns	(0)
  #define v4_tlb_fns	(0)
  #define v4wb_tlb_fns	(0)
  #define v4wbi_tlb_fns	(0)
  #define v6wbi_tlb_fns	(0)
  #define v7wbi_tlb_fns	(0)
  
  #define v3_user_fns	(0)
  #define v4_user_fns	(0)
  #define v4_mc_user_fns	(0)
  #define v4wb_user_fns	(0)
  #define v4wt_user_fns	(0)
  #define v6_user_fns	(0)
  #define xscale_mc_user_fns (0)
  
  #endif /*__ASSEMBLY__*/
  
  #endif /* _ASMARM_PGTABLE_H */
  