LXR linux/arch/arm/include/asm/pgtable-nommu.h

   1/*
   2 *  arch/arm/include/asm/pgtable-nommu.h
   3 *
   4 *  Copyright (C) 1995-2002 Russell King
   5 *  Copyright (C) 2004  Hyok S. Choi
   6 *
   7 * This program is free software; you can redistribute it and/or modify
   8 * it under the terms of the GNU General Public License version 2 as
   9 * published by the Free Software Foundation.
  10 */
  11#ifndef _ASMARM_PGTABLE_NOMMU_H
  12#define _ASMARM_PGTABLE_NOMMU_H
  13
  14#ifndef __ASSEMBLY__
  15
  16#include <linux/slab.h>
  17#include <asm/processor.h>
  18#include <asm/page.h>
  19
  20/*
  21 * Trivial page table functions.
  22 */
  23#define pgd_present(pgd)        (1)
  24#define pgd_none(pgd)           (0)
  25#define pgd_bad(pgd)            (0)
  26#define pgd_clear(pgdp)
  27#define kern_addr_valid(addr)   (1)
  28#define pmd_offset(a, b)        ((void *)0)
  29/* FIXME */
  30/*
  31 * PMD_SHIFT determines the size of the area a second-level page table can map
  32 * PGDIR_SHIFT determines what a third-level page table entry can map
  33 */
  34#define PGDIR_SHIFT             21
  35
  36#define PGDIR_SIZE              (1UL << PGDIR_SHIFT)
  37#define PGDIR_MASK              (~(PGDIR_SIZE-1))
  38/* FIXME */
  39
  40#define PAGE_NONE       __pgprot(0)
  41#define PAGE_SHARED     __pgprot(0)
  42#define PAGE_COPY       __pgprot(0)
  43#define PAGE_READONLY   __pgprot(0)
  44#define PAGE_KERNEL     __pgprot(0)
  45
  46#define swapper_pg_dir ((pgd_t *) 0)
  47
  48#define __swp_type(x)           (0)
  49#define __swp_offset(x)         (0)
  50#define __swp_entry(typ,off)    ((swp_entry_t) { ((typ) | ((off) << 7)) })
  51#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
  52#define __swp_entry_to_pte(x)   ((pte_t) { (x).val })
  53
  54
  55typedef pte_t *pte_addr_t;
  56
  57/*
  58 * ZERO_PAGE is a global shared page that is always zero: used
  59 * for zero-mapped memory areas etc..
  60 */
  61#define ZERO_PAGE(vaddr)        (virt_to_page(0))
  62
  63/*
  64 * Mark the prot value as uncacheable and unbufferable.
  65 */
  66#define pgprot_noncached(prot)  __pgprot(0)
  67#define pgprot_writecombine(prot) __pgprot(0)
  68#define pgprot_dmacoherent(prot) __pgprot(0)
  69
  70
  71/*
  72 * These would be in other places but having them here reduces the diffs.
  73 */
  74extern unsigned int kobjsize(const void *objp);
  75
  76/*
  77 * No page table caches to initialise.
  78 */
  79#define pgtable_cache_init()    do { } while (0)
  80
  81/*
  82 * All 32bit addresses are effectively valid for vmalloc...
  83 * Sort of meaningless for non-VM targets.
  84 */
  85#define VMALLOC_START   0UL
  86#define VMALLOC_END     0xffffffffUL
  87
  88#define FIRST_USER_ADDRESS      0UL
  89
  90#include <asm-generic/pgtable.h>
  91
  92#else 
  93
  94/*
  95 * dummy tlb and user structures.
  96 */
  97#define v3_tlb_fns      (0)
  98#define v4_tlb_fns      (0)
  99#define v4wb_tlb_fns    (0)
 100#define v4wbi_tlb_fns   (0)
 101#define v6wbi_tlb_fns   (0)
 102#define v7wbi_tlb_fns   (0)
 103
 104#define v3_user_fns     (0)
 105#define v4_user_fns     (0)
 106#define v4_mc_user_fns  (0)
 107#define v4wb_user_fns   (0)
 108#define v4wt_user_fns   (0)
 109#define v6_user_fns     (0)
 110#define xscale_mc_user_fns (0)
 111
 112#endif /*__ASSEMBLY__*/
 113
 114#endif /* _ASMARM_PGTABLE_H */
 115