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

   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 /*
  25  * PMD_SHIFT determines the size of the area a second-level page table can map
  26  * PGDIR_SHIFT determines what a third-level page table entry can map
  27  */
  28 #define PGDIR_SHIFT             21
  29
  30 #define PGDIR_SIZE              (1UL << PGDIR_SHIFT)
  31 #define PGDIR_MASK              (~(PGDIR_SIZE-1))
  32 /* FIXME */
  33
  34 #define PAGE_NONE       __pgprot(0)
  35 #define PAGE_SHARED     __pgprot(0)
  36 #define PAGE_COPY       __pgprot(0)
  37 #define PAGE_READONLY   __pgprot(0)
  38 #define PAGE_KERNEL     __pgprot(0)
  39
  40 #define swapper_pg_dir ((pgd_t *) 0)
  41
  42
  43 typedef pte_t *pte_addr_t;
  44
  45 /*
  46  * Mark the prot value as uncacheable and unbufferable.
  47  */
  48 #define pgprot_noncached(prot)  (prot)
  49 #define pgprot_writecombine(prot) (prot)
  50 #define pgprot_device(prot)     (prot)
  51
  52
  53 /*
  54  * These would be in other places but having them here reduces the diffs.
  55  */
  56 extern unsigned int kobjsize(const void *objp);
  57
  58 /*
  59  * All 32bit addresses are effectively valid for vmalloc...
  60  * Sort of meaningless for non-VM targets.
  61  */
  62 #define VMALLOC_START   0UL
  63 #define VMALLOC_END     0xffffffffUL
  64
  65 #define FIRST_USER_ADDRESS      0UL
  66
  67 #else
  68
  69 /*
  70  * dummy tlb and user structures.
  71  */
  72 #define v3_tlb_fns      (0)
  73 #define v4_tlb_fns      (0)
  74 #define v4wb_tlb_fns    (0)
  75 #define v4wbi_tlb_fns   (0)
  76 #define v6wbi_tlb_fns   (0)
  77 #define v7wbi_tlb_fns   (0)
  78
  79 #define v3_user_fns     (0)
  80 #define v4_user_fns     (0)
  81 #define v4_mc_user_fns  (0)
  82 #define v4wb_user_fns   (0)
  83 #define v4wt_user_fns   (0)
  84 #define v6_user_fns     (0)
  85 #define xscale_mc_user_fns (0)
  86
  87 #endif /*__ASSEMBLY__*/
  88
  89 #endif /* _ASMARM_PGTABLE_H */