root/arch/arm/include/asm/pgtable-nommu.h

INCLUDED FROM

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  *  arch/arm/include/asm/pgtable-nommu.h
   4  *
   5  *  Copyright (C) 1995-2002 Russell King
   6  *  Copyright (C) 2004  Hyok S. Choi
   7  */
   8 #ifndef _ASMARM_PGTABLE_NOMMU_H
   9 #define _ASMARM_PGTABLE_NOMMU_H
  10 
  11 #ifndef __ASSEMBLY__
  12 
  13 #include <linux/slab.h>
  14 #include <asm/processor.h>
  15 #include <asm/page.h>
  16 
  17 /*
  18  * Trivial page table functions.
  19  */
  20 #define pgd_present(pgd)        (1)
  21 #define pgd_none(pgd)           (0)
  22 #define pgd_bad(pgd)            (0)
  23 #define pgd_clear(pgdp)
  24 #define kern_addr_valid(addr)   (1)
  25 #define pmd_offset(a, b)        ((void *)0)
  26 /* FIXME */
  27 /*
  28  * PMD_SHIFT determines the size of the area a second-level page table can map
  29  * PGDIR_SHIFT determines what a third-level page table entry can map
  30  */
  31 #define PGDIR_SHIFT             21
  32 
  33 #define PGDIR_SIZE              (1UL << PGDIR_SHIFT)
  34 #define PGDIR_MASK              (~(PGDIR_SIZE-1))
  35 /* FIXME */
  36 
  37 #define PAGE_NONE       __pgprot(0)
  38 #define PAGE_SHARED     __pgprot(0)
  39 #define PAGE_COPY       __pgprot(0)
  40 #define PAGE_READONLY   __pgprot(0)
  41 #define PAGE_KERNEL     __pgprot(0)
  42 
  43 #define swapper_pg_dir ((pgd_t *) 0)
  44 
  45 #define __swp_type(x)           (0)
  46 #define __swp_offset(x)         (0)
  47 #define __swp_entry(typ,off)    ((swp_entry_t) { ((typ) | ((off) << 7)) })
  48 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
  49 #define __swp_entry_to_pte(x)   ((pte_t) { (x).val })
  50 
  51 
  52 typedef pte_t *pte_addr_t;
  53 
  54 /*
  55  * ZERO_PAGE is a global shared page that is always zero: used
  56  * for zero-mapped memory areas etc..
  57  */
  58 #define ZERO_PAGE(vaddr)        (virt_to_page(0))
  59 
  60 /*
  61  * Mark the prot value as uncacheable and unbufferable.
  62  */
  63 #define pgprot_noncached(prot)  (prot)
  64 #define pgprot_writecombine(prot) (prot)
  65 #define pgprot_device(prot)     (prot)
  66 
  67 
  68 /*
  69  * These would be in other places but having them here reduces the diffs.
  70  */
  71 extern unsigned int kobjsize(const void *objp);
  72 
  73 /*
  74  * All 32bit addresses are effectively valid for vmalloc...
  75  * Sort of meaningless for non-VM targets.
  76  */
  77 #define VMALLOC_START   0UL
  78 #define VMALLOC_END     0xffffffffUL
  79 
  80 #define FIRST_USER_ADDRESS      0UL
  81 
  82 #include <asm-generic/pgtable.h>
  83 
  84 #else 
  85 
  86 /*
  87  * dummy tlb and user structures.
  88  */
  89 #define v3_tlb_fns      (0)
  90 #define v4_tlb_fns      (0)
  91 #define v4wb_tlb_fns    (0)
  92 #define v4wbi_tlb_fns   (0)
  93 #define v6wbi_tlb_fns   (0)
  94 #define v7wbi_tlb_fns   (0)
  95 
  96 #define v3_user_fns     (0)
  97 #define v4_user_fns     (0)
  98 #define v4_mc_user_fns  (0)
  99 #define v4wb_user_fns   (0)
 100 #define v4wt_user_fns   (0)
 101 #define v6_user_fns     (0)
 102 #define xscale_mc_user_fns (0)
 103 
 104 #endif /*__ASSEMBLY__*/
 105 
 106 #endif /* _ASMARM_PGTABLE_H */