include/asm-sh/pgtable.h

   1 #ifndef __ASM_SH_PGTABLE_H
   2 #define __ASM_SH_PGTABLE_H
   3
   4 /*
   5  * Copyright (C) 1999 Niibe Yutaka
   6  * Copyright (C) 2002, 2003, 2004 Paul Mundt
   7  */
   8
   9 #include <linux/config.h>
  10 #include <asm/pgtable-2level.h>
  11
  12 /*
  13  * This file contains the functions and defines necessary to modify and use
  14  * the SuperH page table tree.
  15  */
  16 #ifndef __ASSEMBLY__
  17 #include <asm/processor.h>
  18 #include <asm/addrspace.h>
  19 #include <asm/fixmap.h>
  20 #include <linux/threads.h>
  21
  22 extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
  23 extern void paging_init(void);
  24
  25 /*
  26  * Basically we have the same two-level (which is the logical three level
  27  * Linux page table layout folded) page tables as the i386.
  28  */
  29
  30 /*
  31  * ZERO_PAGE is a global shared page that is always zero: used
  32  * for zero-mapped memory areas etc..
  33  */
  34 extern unsigned long empty_zero_page[1024];
  35 #define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
  36
  37 #endif /* !__ASSEMBLY__ */
  38
  39 #define PMD_SIZE        (1UL << PMD_SHIFT)
  40 #define PMD_MASK        (~(PMD_SIZE-1))
  41 #define PGDIR_SIZE      (1UL << PGDIR_SHIFT)
  42 #define PGDIR_MASK      (~(PGDIR_SIZE-1))
  43
  44 #define USER_PTRS_PER_PGD       (TASK_SIZE/PGDIR_SIZE)
  45 #define FIRST_USER_PGD_NR       0
  46
  47 #define PTE_PHYS_MASK   0x1ffff000
  48
  49 #ifndef __ASSEMBLY__
  50 /*
  51  * First 1MB map is used by fixed purpose.
  52  * Currently only 4-enty (16kB) is used (see arch/sh/mm/cache.c)
  53  */
  54 #define VMALLOC_START   (P3SEG+0x00100000)
  55 #define VMALLOC_END     (FIXADDR_START-2*PAGE_SIZE)
  56
  57 #define _PAGE_WT        0x001  /* WT-bit on SH-4, 0 on SH-3 */
  58 #define _PAGE_HW_SHARED 0x002  /* SH-bit  : page is shared among processes */
  59 #define _PAGE_DIRTY     0x004  /* D-bit   : page changed */
  60 #define _PAGE_CACHABLE  0x008  /* C-bit   : cachable */
  61 #define _PAGE_SZ0       0x010  /* SZ0-bit : Size of page */
  62 #define _PAGE_RW        0x020  /* PR0-bit : write access allowed */
  63 #define _PAGE_USER      0x040  /* PR1-bit : user space access allowed */
  64 #define _PAGE_SZ1       0x080  /* SZ1-bit : Size of page (on SH-4) */
  65 #define _PAGE_PRESENT   0x100  /* V-bit   : page is valid */
  66 #define _PAGE_PROTNONE  0x200  /* software: if not present  */
  67 #define _PAGE_ACCESSED  0x400  /* software: page referenced */
  68 #define _PAGE_U0_SHARED 0x800  /* software: page is shared in user space */
  69
  70 #define _PAGE_FILE      _PAGE_WT  /* software: pagecache or swap? */
  71
  72 /* software: moves to PTEA.TC (Timing Control) */
  73 #define _PAGE_PCC_AREA5 0x00000000      /* use BSC registers for area5 */
  74 #define _PAGE_PCC_AREA6 0x80000000      /* use BSC registers for area6 */
  75
  76 /* software: moves to PTEA.SA[2:0] (Space Attributes) */
  77 #define _PAGE_PCC_IODYN 0x00000001      /* IO space, dynamically sized bus */
  78 #define _PAGE_PCC_IO8   0x20000000      /* IO space, 8 bit bus */
  79 #define _PAGE_PCC_IO16  0x20000001      /* IO space, 16 bit bus */
  80 #define _PAGE_PCC_COM8  0x40000000      /* Common Memory space, 8 bit bus */
  81 #define _PAGE_PCC_COM16 0x40000001      /* Common Memory space, 16 bit bus */
  82 #define _PAGE_PCC_ATR8  0x60000000      /* Attribute Memory space, 8 bit bus */
  83 #define _PAGE_PCC_ATR16 0x60000001      /* Attribute Memory space, 6 bit bus */
  84
  85
  86 /* Mask which drop software flags
  87  * We also drop WT bit since it is used for _PAGE_FILE
  88  * bit in this implementation.
  89  */
  90 #define _PAGE_CLEAR_FLAGS       (_PAGE_WT | _PAGE_PROTNONE | _PAGE_ACCESSED | _PAGE_U0_SHARED)
  91
  92 #if defined(CONFIG_CPU_SH3)
  93 /*
  94  * MMU on SH-3 has bug on SH-bit: We can't use it if MMUCR.IX=1.
  95  * Work around: Just drop SH-bit.
  96  */
  97 #define _PAGE_FLAGS_HARDWARE_MASK       (0x1fffffff & ~(_PAGE_CLEAR_FLAGS | _PAGE_HW_SHARED))
  98 #else
  99 #define _PAGE_FLAGS_HARDWARE_MASK       (0x1fffffff & ~(_PAGE_CLEAR_FLAGS))
 100 #endif
 101
 102 /* Hardware flags: SZ0=1 (4k-byte) */
 103 #define _PAGE_FLAGS_HARD        _PAGE_SZ0
 104
 105 #if defined(CONFIG_HUGETLB_PAGE_SIZE_64K)
 106 #define _PAGE_SZHUGE    (_PAGE_SZ1)
 107 #elif defined(CONFIG_HUGETLB_PAGE_SIZE_1MB)
 108 #define _PAGE_SZHUGE    (_PAGE_SZ0 | _PAGE_SZ1)
 109 #endif
 110
 111 #define _PAGE_SHARED    _PAGE_U0_SHARED
 112
 113 #define _PAGE_TABLE     (_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | _PAGE_ACCESSED | _PAGE_DIRTY)
 114 #define _KERNPG_TABLE   (_PAGE_PRESENT | _PAGE_RW | _PAGE_ACCESSED | _PAGE_DIRTY)
 115 #define _PAGE_CHG_MASK  (PTE_MASK | _PAGE_ACCESSED | _PAGE_CACHABLE | _PAGE_DIRTY | _PAGE_SHARED)
 116
 117 #ifdef CONFIG_MMU
 118 #define PAGE_NONE       __pgprot(_PAGE_PROTNONE | _PAGE_CACHABLE |_PAGE_ACCESSED | _PAGE_FLAGS_HARD)
 119 #define PAGE_SHARED     __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | _PAGE_CACHABLE |_PAGE_ACCESSED | _PAGE_SHARED | _PAGE_FLAGS_HARD)
 120 #define PAGE_COPY       __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_CACHABLE | _PAGE_ACCESSED | _PAGE_FLAGS_HARD)
 121 #define PAGE_READONLY   __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_CACHABLE | _PAGE_ACCESSED | _PAGE_FLAGS_HARD)
 122 #define PAGE_KERNEL     __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_CACHABLE | _PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_HW_SHARED | _PAGE_FLAGS_HARD)
 123 #define PAGE_KERNEL_NOCACHE \
 124                         __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_HW_SHARED | _PAGE_FLAGS_HARD)
 125 #define PAGE_KERNEL_RO  __pgprot(_PAGE_PRESENT | _PAGE_CACHABLE | _PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_HW_SHARED | _PAGE_FLAGS_HARD)
 126 #define PAGE_KERNEL_PCC(slot, type) \
 127                         __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_FLAGS_HARD | (slot ? _PAGE_PCC_AREA5 : _PAGE_PCC_AREA6) | (type))
 128 #else /* no mmu */
 129 #define PAGE_NONE               __pgprot(0)
 130 #define PAGE_SHARED             __pgprot(0)
 131 #define PAGE_COPY               __pgprot(0)
 132 #define PAGE_READONLY           __pgprot(0)
 133 #define PAGE_KERNEL             __pgprot(0)
 134 #define PAGE_KERNEL_NOCACHE     __pgprot(0)
 135 #define PAGE_KERNEL_RO          __pgprot(0)
 136 #define PAGE_KERNEL_PCC         __pgprot(0)
 137 #endif
 138
 139 /*
 140  * As i386 and MIPS, SuperH can't do page protection for execute, and
 141  * considers that the same as a read.  Also, write permissions imply
 142  * read permissions. This is the closest we can get..
 143  */
 144
 145 #define __P000  PAGE_NONE
 146 #define __P001  PAGE_READONLY
 147 #define __P010  PAGE_COPY
 148 #define __P011  PAGE_COPY
 149 #define __P100  PAGE_READONLY
 150 #define __P101  PAGE_READONLY
 151 #define __P110  PAGE_COPY
 152 #define __P111  PAGE_COPY
 153
 154 #define __S000  PAGE_NONE
 155 #define __S001  PAGE_READONLY
 156 #define __S010  PAGE_SHARED
 157 #define __S011  PAGE_SHARED
 158 #define __S100  PAGE_READONLY
 159 #define __S101  PAGE_READONLY
 160 #define __S110  PAGE_SHARED
 161 #define __S111  PAGE_SHARED
 162
 163 #define pte_none(x)     (!pte_val(x))
 164 #define pte_present(x)  (pte_val(x) & (_PAGE_PRESENT | _PAGE_PROTNONE))
 165 #define pte_clear(xp)   do { set_pte(xp, __pte(0)); } while (0)
 166
 167 #define pmd_none(x)     (!pmd_val(x))
 168 #define pmd_present(x)  (pmd_val(x) & _PAGE_PRESENT)
 169 #define pmd_clear(xp)   do { set_pmd(xp, __pmd(0)); } while (0)
 170 #define pmd_bad(x)      ((pmd_val(x) & (~PAGE_MASK & ~_PAGE_USER)) != _KERNPG_TABLE)
 171
 172 #define pages_to_mb(x)  ((x) >> (20-PAGE_SHIFT))
 173 #define pte_page(x)     phys_to_page(pte_val(x)&PTE_PHYS_MASK)
 174
 175 /*
 176  * The following only work if pte_present() is true.
 177  * Undefined behaviour if not..
 178  */
 179 static inline int pte_read(pte_t pte) { return pte_val(pte) & _PAGE_USER; }
 180 static inline int pte_exec(pte_t pte) { return pte_val(pte) & _PAGE_USER; }
 181 static inline int pte_dirty(pte_t pte){ return pte_val(pte) & _PAGE_DIRTY; }
 182 static inline int pte_young(pte_t pte){ return pte_val(pte) & _PAGE_ACCESSED; }
 183 static inline int pte_file(pte_t pte) { return pte_val(pte) & _PAGE_FILE; }
 184 static inline int pte_write(pte_t pte){ return pte_val(pte) & _PAGE_RW; }
 185 static inline int pte_not_present(pte_t pte){ return !(pte_val(pte) & _PAGE_PRESENT); }
 186
 187 static inline pte_t pte_rdprotect(pte_t pte)    { set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_USER)); return pte; }
 188 static inline pte_t pte_exprotect(pte_t pte)    { set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_USER)); return pte; }
 189 static inline pte_t pte_mkclean(pte_t pte)      { set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_DIRTY)); return pte; }
 190 static inline pte_t pte_mkold(pte_t pte)        { set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_ACCESSED)); return pte; }
 191 static inline pte_t pte_wrprotect(pte_t pte)    { set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_RW)); return pte; }
 192 static inline pte_t pte_mkread(pte_t pte)       { set_pte(&pte, __pte(pte_val(pte) | _PAGE_USER)); return pte; }
 193 static inline pte_t pte_mkexec(pte_t pte)       { set_pte(&pte, __pte(pte_val(pte) | _PAGE_USER)); return pte; }
 194 static inline pte_t pte_mkdirty(pte_t pte)      { set_pte(&pte, __pte(pte_val(pte) | _PAGE_DIRTY)); return pte; }
 195 static inline pte_t pte_mkyoung(pte_t pte)      { set_pte(&pte, __pte(pte_val(pte) | _PAGE_ACCESSED)); return pte; }
 196 static inline pte_t pte_mkwrite(pte_t pte)      { set_pte(&pte, __pte(pte_val(pte) | _PAGE_RW)); return pte; }
 197
 198 /*
 199  * Macro and implementation to make a page protection as uncachable.
 200  */
 201 #define pgprot_noncached pgprot_noncached
 202
 203 static inline pgprot_t pgprot_noncached(pgprot_t _prot)
 204 {
 205         unsigned long prot = pgprot_val(_prot);
 206
 207         prot &= ~_PAGE_CACHABLE;
 208         return __pgprot(prot);
 209 }
 210
 211 #define pgprot_writecombine(prot) __pgprot(pgprot_val(prot) & ~_PAGE_CACHABLE)
 212
 213 /*
 214  * Conversion functions: convert a page and protection to a page entry,
 215  * and a page entry and page directory to the page they refer to.
 216  *
 217  * extern pte_t mk_pte(struct page *page, pgprot_t pgprot)
 218  */
 219 #define mk_pte(page, pgprot)    pfn_pte(page_to_pfn(page), (pgprot))
 220
 221 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 222 { set_pte(&pte, __pte((pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot))); return pte; }
 223
 224 #define page_pte(page) page_pte_prot(page, __pgprot(0))
 225
 226 #define pmd_page_kernel(pmd) \
 227 ((unsigned long) __va(pmd_val(pmd) & PAGE_MASK))
 228
 229 #define pmd_page(pmd) \
 230         (phys_to_page(pmd_val(pmd)))
 231
 232 /* to find an entry in a page-table-directory. */
 233 #define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD-1))
 234 #define pgd_offset(mm, address) ((mm)->pgd+pgd_index(address))
 235
 236 /* to find an entry in a kernel page-table-directory */
 237 #define pgd_offset_k(address) pgd_offset(&init_mm, address)
 238
 239 /* Find an entry in the third-level page table.. */
 240 #define pte_index(address) \
 241                 ((address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
 242 #define pte_offset_kernel(dir, address) \
 243         ((pte_t *) pmd_page_kernel(*(dir)) + pte_index(address))
 244 #define pte_offset_map(dir, address) pte_offset_kernel(dir, address)
 245 #define pte_offset_map_nested(dir, address) pte_offset_kernel(dir, address)
 246 #define pte_unmap(pte)          do { } while (0)
 247 #define pte_unmap_nested(pte)   do { } while (0)
 248
 249 struct vm_area_struct;
 250 extern void update_mmu_cache(struct vm_area_struct * vma,
 251                              unsigned long address, pte_t pte);
 252
 253 /* Encode and de-code a swap entry */
 254 /*
 255  * NOTE: We should set ZEROs at the position of _PAGE_PRESENT
 256  *       and _PAGE_PROTNONE bits
 257  */
 258 #define __swp_type(x)           ((x).val & 0xff)
 259 #define __swp_offset(x)         ((x).val >> 10)
 260 #define __swp_entry(type, offset) ((swp_entry_t) { (type) | ((offset) << 10) })
 261 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) >> 1 })
 262 #define __swp_entry_to_pte(x)   ((pte_t) { (x).val << 1 })
 263
 264 /*
 265  * Encode and decode a nonlinear file mapping entry
 266  */
 267 #define PTE_FILE_MAX_BITS       29
 268 #define pte_to_pgoff(pte)       (pte_val(pte) >> 1)
 269 #define pgoff_to_pte(off)       ((pte_t) { ((off) << 1) | _PAGE_FILE })
 270
 271 typedef pte_t *pte_addr_t;
 272
 273 #endif /* !__ASSEMBLY__ */
 274
 275 #define kern_addr_valid(addr)   (1)
 276
 277 #define io_remap_page_range remap_page_range
 278
 279 /*
 280  * No page table caches to initialise
 281  */
 282 #define pgtable_cache_init()    do { } while (0)
 283
 284 #ifndef CONFIG_MMU
 285 extern unsigned int kobjsize(const void *objp);
 286 #endif /* !CONFIG_MMU */
 287
 288 #ifdef CONFIG_CPU_SH4
 289 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR
 290 extern inline pte_t ptep_get_and_clear(pte_t *ptep);
 291 #endif
 292
 293 #include <asm-generic/pgtable.h>
 294
 295 #endif /* __ASM_SH_PAGE_H */
 296