include/asm-nios2nommu/pgtable.h

   1 #ifndef _NIOS_PGTABLE_H
   2 #define _NIOS_PGTABLE_H
   3
   4 /*--------------------------------------------------------------------
   5  *
   6  * include/asm-nios2nommu/pgtable.h
   7  *
   8  * Derived from various works, Alpha, ix86, M68K, Sparc, ...et al
   9  *
  10  * Copyright (C) 2004   Microtronix Datacom Ltd
  11  *
  12  * This program is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License as published by
  14  * the Free Software Foundation; either version 2 of the License, or
  15  * (at your option) any later version.
  16  *
  17  * This program is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU General Public License for more details.
  21  *
  22  *
  23  * Jan/20/2004          dgt         NiosII
  24  *
  25  ---------------------------------------------------------------------*/
  26
  27 #include <asm-generic/4level-fixup.h>
  28
  29 //vic - this bit copied from m68knommu version
  30 #include <asm/setup.h>
  31 #include <asm/io.h>
  32
  33 typedef pte_t *pte_addr_t;
  34
  35 #define pgd_present(pgd)        (1)       /* pages are always present on NO_MM */
  36 #define pgd_none(pgd)           (0)
  37 #define pgd_bad(pgd)            (0)
  38 #define pgd_clear(pgdp)
  39 #define kern_addr_valid(addr)   (1)
  40 #define pmd_offset(a, b)        ((void *)0)
  41
  42 #define PAGE_NONE               __pgprot(0)    /* these mean nothing to NO_MM */
  43 #define PAGE_SHARED             __pgprot(0)    /* these mean nothing to NO_MM */
  44 #define PAGE_COPY               __pgprot(0)    /* these mean nothing to NO_MM */
  45 #define PAGE_READONLY           __pgprot(0)    /* these mean nothing to NO_MM */
  46 #define PAGE_KERNEL             __pgprot(0)    /* these mean nothing to NO_MM */
  47 //vic - this bit copied from m68knommu version
  48
  49 extern void paging_init(void);
  50 #define swapper_pg_dir ((pgd_t *) 0)
  51
  52 #define __swp_type(x)           (0)
  53 #define __swp_offset(x)         (0)
  54 #define __swp_entry(typ,off)    ((swp_entry_t) { ((typ) | ((off) << 7)) })
  55 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
  56 #define __swp_entry_to_pte(x)   ((pte_t) { (x).val })
  57
  58 static inline int pte_file(pte_t pte) { return 0; }
  59
  60 /*
  61  * ZERO_PAGE is a global shared page that is always zero: used
  62  * for zero-mapped memory areas etc..
  63  */
  64 #define ZERO_PAGE(vaddr)        (virt_to_page(0))
  65
  66 extern unsigned int kobjsize(const void *objp);
  67 extern int is_in_rom(unsigned long);
  68
  69 /*
  70  * No page table caches to initialise
  71  */
  72 #define pgtable_cache_init()   do { } while (0)
  73
  74 #define io_remap_pfn_range(vma, vaddr, pfn, size, prot)         \
  75                 remap_pfn_range(vma, vaddr, pfn, size, prot)
  76
  77 extern inline void flush_cache_mm(struct mm_struct *mm)
  78 {
  79 }
  80
  81 extern inline void flush_cache_range(struct mm_struct *mm,
  82                                      unsigned long start,
  83                                      unsigned long end)
  84 {
  85 }
  86
  87 /* Push the page at kernel virtual address and clear the icache */
  88 extern inline void flush_page_to_ram (unsigned long address)
  89 {
  90 }
  91
  92 /* Push n pages at kernel virtual address and clear the icache */
  93 extern inline void flush_pages_to_ram (unsigned long address, int n)
  94 {
  95 }
  96
  97 /*
  98  * All 32bit addresses are effectively valid for vmalloc...
  99  * Sort of meaningless for non-VM targets.
 100  */
 101 #define VMALLOC_START   0
 102 #define VMALLOC_END     0xffffffff
 103
 104 #endif /* _NIOS_PGTABLE_H */