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
  55 typedef 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)  (prot)
  67 #define pgprot_writecombine(prot) (prot)
  68 #define pgprot_dmacoherent(prot) (prot)
  69 #define pgprot_device(prot)     (prot)
  70
  71
  72 /*
  73  * These would be in other places but having them here reduces the diffs.
  74  */
  75 extern unsigned int kobjsize(const void *objp);
  76
  77 /*
  78  * No page table caches to initialise.
  79  */
  80 #define pgtable_cache_init()    do { } while (0)
  81
  82 /*
  83  * All 32bit addresses are effectively valid for vmalloc...
  84  * Sort of meaningless for non-VM targets.
  85  */
  86 #define VMALLOC_START   0UL
  87 #define VMALLOC_END     0xffffffffUL
  88
  89 #define FIRST_USER_ADDRESS      0UL
  90
  91 #include <asm-generic/pgtable.h>
  92
  93 #else
  94
  95 /*
  96  * dummy tlb and user structures.
  97  */
  98 #define v3_tlb_fns      (0)
  99 #define v4_tlb_fns      (0)
 100 #define v4wb_tlb_fns    (0)
 101 #define v4wbi_tlb_fns   (0)
 102 #define v6wbi_tlb_fns   (0)
 103 #define v7wbi_tlb_fns   (0)
 104
 105 #define v3_user_fns     (0)
 106 #define v4_user_fns     (0)
 107 #define v4_mc_user_fns  (0)
 108 #define v4wb_user_fns   (0)
 109 #define v4wt_user_fns   (0)
 110 #define v6_user_fns     (0)
 111 #define xscale_mc_user_fns (0)
 112
 113 #endif /*__ASSEMBLY__*/
 114
 115 #endif /* _ASMARM_PGTABLE_H */