target/linux/ubicom32/files/arch/ubicom32/include/asm/pgtable.h

   1 /*
   2  * arch/ubicom32/include/asm/pgtable.h
   3  *   Ubicom32 pseudo page table definitions and operations.
   4  *
   5  * (C) Copyright 2009, Ubicom, Inc.
   6  * Copyright (C) 2004   Microtronix Datacom Ltd
   7  *
   8  * This file is part of the Ubicom32 Linux Kernel Port.
   9  *
  10  * The Ubicom32 Linux Kernel Port is free software: you can redistribute
  11  * it and/or modify it under the terms of the GNU General Public License
  12  * as published by the Free Software Foundation, either version 2 of the
  13  * License, or (at your option) any later version.
  14  *
  15  * The Ubicom32 Linux Kernel Port is distributed in the hope that it
  16  * will be useful, but WITHOUT ANY WARRANTY; without even the implied
  17  * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  18  * the GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with the Ubicom32 Linux Kernel Port.  If not,
  22  * see <http://www.gnu.org/licenses/>.
  23  *
  24  * Ubicom32 implementation derived from (with many thanks):
  25  *   arch/m68knommu
  26  *   arch/blackfin
  27  *   arch/parisc
  28  *   and various works, Alpha, ix86, M68K, Sparc, ...et al
  29  */
  30 #ifndef _ASM_UBICOM32_PGTABLE_H
  31 #define _ASM_UBICOM32_PGTABLE_H
  32
  33 #include <asm-generic/4level-fixup.h>
  34
  35 //vic - this bit copied from m68knommu version
  36 #include <asm/setup.h>
  37 #include <asm/io.h>
  38 #include <linux/sched.h>
  39
  40 typedef pte_t *pte_addr_t;
  41
  42 #define pgd_present(pgd)        (1)       /* pages are always present on NO_MM */
  43 #define pgd_none(pgd)           (0)
  44 #define pgd_bad(pgd)            (0)
  45 #define pgd_clear(pgdp)
  46 #define kern_addr_valid(addr)   (1)
  47 #define pmd_offset(a, b)        ((void *)0)
  48
  49 #define PAGE_NONE               __pgprot(0)    /* these mean nothing to NO_MM */
  50 #define PAGE_SHARED             __pgprot(0)    /* these mean nothing to NO_MM */
  51 #define PAGE_COPY               __pgprot(0)    /* these mean nothing to NO_MM */
  52 #define PAGE_READONLY           __pgprot(0)    /* these mean nothing to NO_MM */
  53 #define PAGE_KERNEL             __pgprot(0)    /* these mean nothing to NO_MM */
  54 //vic - this bit copied from m68knommu version
  55
  56 extern void paging_init(void);
  57 #define swapper_pg_dir ((pgd_t *) 0)
  58
  59 #define __swp_type(x)           (0)
  60 #define __swp_offset(x)         (0)
  61 #define __swp_entry(typ,off)    ((swp_entry_t) { ((typ) | ((off) << 7)) })
  62 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
  63 #define __swp_entry_to_pte(x)   ((pte_t) { (x).val })
  64
  65 /*
  66  * pgprot_noncached() is only for infiniband pci support, and a real
  67  * implementation for RAM would be more complicated.
  68  */
  69 #define pgprot_noncached(prot)  (prot)
  70
  71 static inline int pte_file(pte_t pte) { return 0; }
  72
  73 /*
  74  * ZERO_PAGE is a global shared page that is always zero: used
  75  * for zero-mapped memory areas etc..
  76  */
  77 #define ZERO_PAGE(vaddr)        (virt_to_page(0))
  78
  79 extern unsigned int kobjsize(const void *objp);
  80 extern int is_in_rom(unsigned long);
  81
  82 /*
  83  * No page table caches to initialise
  84  */
  85 #define pgtable_cache_init()   do { } while (0)
  86
  87 #define io_remap_pfn_range(vma, vaddr, pfn, size, prot)         \
  88                 remap_pfn_range(vma, vaddr, pfn, size, prot)
  89
  90 extern inline void flush_cache_mm(struct mm_struct *mm)
  91 {
  92 }
  93
  94 extern inline void flush_cache_range(struct mm_struct *mm,
  95                                      unsigned long start,
  96                                      unsigned long end)
  97 {
  98 }
  99
 100 /* Push the page at kernel virtual address and clear the icache */
 101 extern inline void flush_page_to_ram (unsigned long address)
 102 {
 103 }
 104
 105 /* Push n pages at kernel virtual address and clear the icache */
 106 extern inline void flush_pages_to_ram (unsigned long address, int n)
 107 {
 108 }
 109
 110 /*
 111  * All 32bit addresses are effectively valid for vmalloc...
 112  * Sort of meaningless for non-VM targets.
 113  */
 114 #define VMALLOC_START   0
 115 #define VMALLOC_END     0xffffffff
 116
 117 #define arch_enter_lazy_mmu_mode()      do {} while (0)
 118 #define arch_leave_lazy_mmu_mode()      do {} while (0)
 119 #define arch_flush_lazy_mmu_mode()      do {} while (0)
 120 #define arch_enter_lazy_cpu_mode()      do {} while (0)
 121 #define arch_leave_lazy_cpu_mode()      do {} while (0)
 122 #define arch_flush_lazy_cpu_mode()      do {} while (0)
 123
 124 #endif /* _ASM_UBICOM32_PGTABLE_H */