arch/sh/include/asm/pgtable.h

   1 /*
   2  * This file contains the functions and defines necessary to modify and
   3  * use the SuperH page table tree.
   4  *
   5  * Copyright (C) 1999 Niibe Yutaka
   6  * Copyright (C) 2002 - 2007 Paul Mundt
   7  *
   8  * This file is subject to the terms and conditions of the GNU General
   9  * Public License.  See the file "COPYING" in the main directory of this
  10  * archive for more details.
  11  */
  12 #ifndef __ASM_SH_PGTABLE_H
  13 #define __ASM_SH_PGTABLE_H
  14
  15 #ifdef CONFIG_X2TLB
  16 #include <asm/pgtable-3level.h>
  17 #else
  18 #include <asm/pgtable-2level.h>
  19 #endif
  20 #include <asm/page.h>
  21 #include <asm/mmu.h>
  22
  23 #ifndef __ASSEMBLY__
  24 #include <asm/addrspace.h>
  25 #include <asm/fixmap.h>
  26
  27 /*
  28  * ZERO_PAGE is a global shared page that is always zero: used
  29  * for zero-mapped memory areas etc..
  30  */
  31 extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)];
  32 #define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
  33
  34 #endif /* !__ASSEMBLY__ */
  35
  36 /*
  37  * Effective and physical address definitions, to aid with sign
  38  * extension.
  39  */
  40 #define NEFF            32
  41 #define NEFF_SIGN       (1LL << (NEFF - 1))
  42 #define NEFF_MASK       (-1LL << NEFF)
  43
  44 static inline unsigned long long neff_sign_extend(unsigned long val)
  45 {
  46         unsigned long long extended = val;
  47         return (extended & NEFF_SIGN) ? (extended | NEFF_MASK) : extended;
  48 }
  49
  50 #ifdef CONFIG_29BIT
  51 #define NPHYS           29
  52 #else
  53 #define NPHYS           32
  54 #endif
  55
  56 #define NPHYS_SIGN      (1LL << (NPHYS - 1))
  57 #define NPHYS_MASK      (-1LL << NPHYS)
  58
  59 #define PGDIR_SIZE      (1UL << PGDIR_SHIFT)
  60 #define PGDIR_MASK      (~(PGDIR_SIZE-1))
  61
  62 /* Entries per level */
  63 #define PTRS_PER_PTE    (PAGE_SIZE / (1 << PTE_MAGNITUDE))
  64
  65 #define FIRST_USER_ADDRESS      0UL
  66
  67 #define PHYS_ADDR_MASK29                0x1fffffff
  68 #define PHYS_ADDR_MASK32                0xffffffff
  69
  70 static inline unsigned long phys_addr_mask(void)
  71 {
  72         /* Is the MMU in 29bit mode? */
  73         if (__in_29bit_mode())
  74                 return PHYS_ADDR_MASK29;
  75
  76         return PHYS_ADDR_MASK32;
  77 }
  78
  79 #define PTE_PHYS_MASK           (phys_addr_mask() & PAGE_MASK)
  80 #define PTE_FLAGS_MASK          (~(PTE_PHYS_MASK) << PAGE_SHIFT)
  81
  82 #ifdef CONFIG_SUPERH32
  83 #define VMALLOC_START   (P3SEG)
  84 #else
  85 #define VMALLOC_START   (0xf0000000)
  86 #endif
  87 #define VMALLOC_END     (FIXADDR_START-2*PAGE_SIZE)
  88
  89 #if defined(CONFIG_SUPERH32)
  90 #include <asm/pgtable_32.h>
  91 #else
  92 #include <asm/pgtable_64.h>
  93 #endif
  94
  95 /*
  96  * SH-X and lower (legacy) SuperH parts (SH-3, SH-4, some SH-4A) can't do page
  97  * protection for execute, and considers it the same as a read. Also, write
  98  * permission implies read permission. This is the closest we can get..
  99  *
 100  * SH-X2 (SH7785) and later parts take this to the opposite end of the extreme,
 101  * not only supporting separate execute, read, and write bits, but having
 102  * completely separate permission bits for user and kernel space.
 103  */
 104          /*xwr*/
 105 #define __P000  PAGE_NONE
 106 #define __P001  PAGE_READONLY
 107 #define __P010  PAGE_COPY
 108 #define __P011  PAGE_COPY
 109 #define __P100  PAGE_EXECREAD
 110 #define __P101  PAGE_EXECREAD
 111 #define __P110  PAGE_COPY
 112 #define __P111  PAGE_COPY
 113
 114 #define __S000  PAGE_NONE
 115 #define __S001  PAGE_READONLY
 116 #define __S010  PAGE_WRITEONLY
 117 #define __S011  PAGE_SHARED
 118 #define __S100  PAGE_EXECREAD
 119 #define __S101  PAGE_EXECREAD
 120 #define __S110  PAGE_RWX
 121 #define __S111  PAGE_RWX
 122
 123 typedef pte_t *pte_addr_t;
 124
 125 #define kern_addr_valid(addr)   (1)
 126
 127 #define pte_pfn(x)              ((unsigned long)(((x).pte_low >> PAGE_SHIFT)))
 128
 129 /*
 130  * Initialise the page table caches
 131  */
 132 extern void pgtable_cache_init(void);
 133
 134 struct vm_area_struct;
 135 struct mm_struct;
 136
 137 extern void __update_cache(struct vm_area_struct *vma,
 138                            unsigned long address, pte_t pte);
 139 extern void __update_tlb(struct vm_area_struct *vma,
 140                          unsigned long address, pte_t pte);
 141
 142 static inline void
 143 update_mmu_cache(struct vm_area_struct *vma, unsigned long address, pte_t *ptep)
 144 {
 145         pte_t pte = *ptep;
 146         __update_cache(vma, address, pte);
 147         __update_tlb(vma, address, pte);
 148 }
 149
 150 extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
 151 extern void paging_init(void);
 152 extern void page_table_range_init(unsigned long start, unsigned long end,
 153                                   pgd_t *pgd);
 154
 155 /* arch/sh/mm/mmap.c */
 156 #define HAVE_ARCH_UNMAPPED_AREA
 157 #define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
 158
 159 #define __HAVE_ARCH_PTE_SPECIAL
 160
 161 #include <asm-generic/pgtable.h>
 162
 163 #endif /* __ASM_SH_PGTABLE_H */