linux/arch/arm/include/asm/pgtable-nommu.h
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   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/* FIXME */
  26/*
  27 * PMD_SHIFT determines the size of the area a second-level page table can map
  28 * PGDIR_SHIFT determines what a third-level page table entry can map
  29 */
  30#define PGDIR_SHIFT             21
  31
  32#define PGDIR_SIZE              (1UL << PGDIR_SHIFT)
  33#define PGDIR_MASK              (~(PGDIR_SIZE-1))
  34/* FIXME */
  35
  36#define PAGE_NONE       __pgprot(0)
  37#define PAGE_SHARED     __pgprot(0)
  38#define PAGE_COPY       __pgprot(0)
  39#define PAGE_READONLY   __pgprot(0)
  40#define PAGE_KERNEL     __pgprot(0)
  41
  42#define swapper_pg_dir ((pgd_t *) 0)
  43
  44
  45typedef pte_t *pte_addr_t;
  46
  47/*
  48 * ZERO_PAGE is a global shared page that is always zero: used
  49 * for zero-mapped memory areas etc..
  50 */
  51#define ZERO_PAGE(vaddr)        (virt_to_page(0))
  52
  53/*
  54 * Mark the prot value as uncacheable and unbufferable.
  55 */
  56#define pgprot_noncached(prot)  (prot)
  57#define pgprot_writecombine(prot) (prot)
  58#define pgprot_device(prot)     (prot)
  59
  60
  61/*
  62 * These would be in other places but having them here reduces the diffs.
  63 */
  64extern unsigned int kobjsize(const void *objp);
  65
  66/*
  67 * All 32bit addresses are effectively valid for vmalloc...
  68 * Sort of meaningless for non-VM targets.
  69 */
  70#define VMALLOC_START   0UL
  71#define VMALLOC_END     0xffffffffUL
  72
  73#define FIRST_USER_ADDRESS      0UL
  74
  75#else 
  76
  77/*
  78 * dummy tlb and user structures.
  79 */
  80#define v3_tlb_fns      (0)
  81#define v4_tlb_fns      (0)
  82#define v4wb_tlb_fns    (0)
  83#define v4wbi_tlb_fns   (0)
  84#define v6wbi_tlb_fns   (0)
  85#define v7wbi_tlb_fns   (0)
  86
  87#define v3_user_fns     (0)
  88#define v4_user_fns     (0)
  89#define v4_mc_user_fns  (0)
  90#define v4wb_user_fns   (0)
  91#define v4wt_user_fns   (0)
  92#define v6_user_fns     (0)
  93#define xscale_mc_user_fns (0)
  94
  95#endif /*__ASSEMBLY__*/
  96
  97#endif /* _ASMARM_PGTABLE_H */
  98