include/asm-sh/pgtable.h

   1 #ifndef __ASM_SH_PGTABLE_H
   2 #define __ASM_SH_PGTABLE_H
   3
   4 /* Copyright (C) 1999 Niibe Yutaka */
   5
   6 /*
   7  * This file contains the functions and defines necessary to modify and use
   8  * the SuperH page table tree.
   9  */
  10 #ifndef __ASSEMBLY__
  11 #include <asm/processor.h>
  12 #include <asm/addrspace.h>
  13 #include <linux/threads.h>
  14
  15 extern pgd_t swapper_pg_dir[1024];
  16 extern void paging_init(void);
  17
  18 #if defined(__sh3__)
  19 /* Cache flushing:
  20  *
  21  *  - flush_cache_all() flushes entire cache
  22  *  - flush_cache_mm(mm) flushes the specified mm context's cache lines
  23  *  - flush_cache_page(mm, vmaddr) flushes a single page
  24  *  - flush_cache_range(mm, start, end) flushes a range of pages
  25  *
  26  *  - flush_page_to_ram(page) write back kernel page to ram
  27  *  - flush_icache_range(start, end) flushes(invalidates) a range for icache
  28  *  - flush_icache_page(vma, pg) flushes(invalidates) a page for icache
  29  *
  30  *  Caches are indexed (effectively) by physical address on SH-3, so
  31  *  we don't need them.
  32  */
  33 #define flush_cache_all()                       do { } while (0)
  34 #define flush_cache_mm(mm)                      do { } while (0)
  35 #define flush_cache_range(mm, start, end)       do { } while (0)
  36 #define flush_cache_page(vma, vmaddr)           do { } while (0)
  37 #define flush_page_to_ram(page)                 do { } while (0)
  38 #define flush_dcache_page(page)                 do { } while (0)
  39 #define flush_icache_range(start, end)          do { } while (0)
  40 #define flush_icache_page(vma,pg)               do { } while (0)
  41 #elif defined(__SH4__)
  42 /*
  43  *  Caches are broken on SH-4, so we need them.
  44  */
  45 extern void flush_cache_all(void);
  46 extern void flush_cache_mm(struct mm_struct *mm);
  47 extern void flush_cache_range(struct mm_struct *mm, unsigned long start,
  48                               unsigned long end);
  49 extern void flush_cache_page(struct vm_area_struct *vma, unsigned long addr);
  50 extern void flush_page_to_ram(struct page *page);
  51 extern void flush_icache_range(unsigned long start, unsigned long end);
  52 extern void flush_icache_page(struct vm_area_struct *vma, struct page *pg);
  53 #endif
  54
  55 /*
  56  * Basically we have the same two-level (which is the logical three level
  57  * Linux page table layout folded) page tables as the i386.
  58  */
  59
  60 /*
  61  * ZERO_PAGE is a global shared page that is always zero: used
  62  * for zero-mapped memory areas etc..
  63  */
  64 extern unsigned long empty_zero_page[1024];
  65 #define ZERO_PAGE(vaddr) (mem_map + MAP_NR(empty_zero_page))
  66
  67 #endif /* !__ASSEMBLY__ */
  68
  69 #include <asm/pgtable-2level.h>
  70
  71 #define __beep() asm("")
  72
  73 #define PMD_SIZE        (1UL << PMD_SHIFT)
  74 #define PMD_MASK        (~(PMD_SIZE-1))
  75 #define PGDIR_SIZE      (1UL << PGDIR_SHIFT)
  76 #define PGDIR_MASK      (~(PGDIR_SIZE-1))
  77
  78 #define USER_PTRS_PER_PGD       (TASK_SIZE/PGDIR_SIZE)
  79 #define FIRST_USER_PGD_NR       0
  80
  81 #define USER_PGD_PTRS (PAGE_OFFSET >> PGDIR_SHIFT)
  82 #define KERNEL_PGD_PTRS (PTRS_PER_PGD-USER_PGD_PTRS)
  83
  84 #define TWOLEVEL_PGDIR_SHIFT    22
  85 #define BOOT_USER_PGD_PTRS (PAGE_OFFSET >> TWOLEVEL_PGDIR_SHIFT)
  86 #define BOOT_KERNEL_PGD_PTRS (1024-BOOT_USER_PGD_PTRS)
  87
  88 #ifndef __ASSEMBLY__
  89 #define VMALLOC_START   P3SEG
  90 #define VMALLOC_VMADDR(x) ((unsigned long)(x))
  91 #define VMALLOC_END     P4SEG
  92
  93 #define _PAGE_PRESENT   0x001  /* software: page is present */
  94 #define _PAGE_ACCESSED  0x002  /* software: page referenced */
  95 #define _PAGE_DIRTY     0x004  /* D-bit   : page changed */
  96 #define _PAGE_CACHABLE  0x008  /* C-bit   : cachable */
  97 /*                      0x010     SZ-bit  : size of page */
  98 #define _PAGE_RW        0x020  /* PR0-bit : write access allowed */
  99 #define _PAGE_USER      0x040  /* PR1-bit : user space access allowed */
 100 #define _PAGE_PROTNONE  0x080  /* software: if not present */
 101 /*                      0x100     V-bit   : page is valid */
 102
 103 #if defined(__sh3__)
 104 /* Mask which drop software flags */
 105 #define _PAGE_FLAGS_HARDWARE_MASK       0x1ffff06c
 106 /* Flags defalult: SZ=1 (4k-byte), C=0 (non-cachable), SH=0 (not shared) */
 107 #define _PAGE_FLAGS_HARDWARE_DEFAULT    0x00000110
 108 #elif defined(__SH4__)
 109 /* Mask which drops software flags */
 110 #define _PAGE_FLAGS_HARDWARE_MASK       0x1ffff06c
 111 /* Flags defalult: SZ=01 (4k-byte), C=0 (non-cachable), SH=0 (not shared), WT=0 */
 112 #define _PAGE_FLAGS_HARDWARE_DEFAULT    0x00000110
 113 #endif
 114
 115 #define _PAGE_TABLE     (_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | _PAGE_ACCESSED | _PAGE_DIRTY)
 116 #define _KERNPG_TABLE   (_PAGE_PRESENT | _PAGE_RW | _PAGE_ACCESSED | _PAGE_DIRTY)
 117 #define _PAGE_CHG_MASK  (PTE_MASK | _PAGE_ACCESSED | _PAGE_CACHABLE | _PAGE_DIRTY)
 118
 119 #define PAGE_NONE       __pgprot(_PAGE_PROTNONE | _PAGE_CACHABLE |_PAGE_ACCESSED)
 120 #define PAGE_SHARED     __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | _PAGE_CACHABLE |_PAGE_ACCESSED)
 121 #define PAGE_COPY       __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_CACHABLE | _PAGE_ACCESSED)
 122 #define PAGE_READONLY   __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_CACHABLE | _PAGE_ACCESSED)
 123 #define PAGE_KERNEL     __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_CACHABLE | _PAGE_DIRTY | _PAGE_ACCESSED)
 124 #define PAGE_KERNEL_RO  __pgprot(_PAGE_PRESENT | _PAGE_CACHABLE | _PAGE_DIRTY | _PAGE_ACCESSED)
 125
 126 /*
 127  * As i386 and MIPS, SuperH can't do page protection for execute, and
 128  * considers that the same are read.  Also, write permissions imply
 129  * read permissions. This is the closest we can get..
 130  */
 131
 132 #define __P000  PAGE_NONE
 133 #define __P001  PAGE_READONLY
 134 #define __P010  PAGE_COPY
 135 #define __P011  PAGE_COPY
 136 #define __P100  PAGE_READONLY
 137 #define __P101  PAGE_READONLY
 138 #define __P110  PAGE_COPY
 139 #define __P111  PAGE_COPY
 140
 141 #define __S000  PAGE_NONE
 142 #define __S001  PAGE_READONLY
 143 #define __S010  PAGE_SHARED
 144 #define __S011  PAGE_SHARED
 145 #define __S100  PAGE_READONLY
 146 #define __S101  PAGE_READONLY
 147 #define __S110  PAGE_SHARED
 148 #define __S111  PAGE_SHARED
 149
 150 /*
 151  * Handling allocation failures during page table setup.
 152  */
 153 extern void __handle_bad_pmd(pmd_t * pmd);
 154 extern void __handle_bad_pmd_kernel(pmd_t * pmd);
 155
 156 #define pte_none(x)     (!pte_val(x))
 157 #define pte_present(x)  (pte_val(x) & (_PAGE_PRESENT | _PAGE_PROTNONE))
 158 #define pte_clear(xp)   do { set_pte(xp, __pte(0)); } while (0)
 159 #define pte_pagenr(x)   ((unsigned long)(((pte_val(x) -__MEMORY_START) >> PAGE_SHIFT)))
 160
 161 #define pmd_none(x)     (!pmd_val(x))
 162 #define pmd_present(x)  (pmd_val(x) & _PAGE_PRESENT)
 163 #define pmd_clear(xp)   do { set_pmd(xp, __pmd(0)); } while (0)
 164 #define pmd_bad(x)      ((pmd_val(x) & (~PAGE_MASK & ~_PAGE_USER)) != _KERNPG_TABLE)
 165
 166 /*
 167  * Permanent address of a page. Obviously must never be
 168  * called on a highmem page.
 169  */
 170 #define page_address(page)  ((page)->virtual)
 171 #define pages_to_mb(x) ((x) >> (20-PAGE_SHIFT))
 172 #define pte_page(x) (mem_map+pte_pagenr(x))
 173
 174 /*
 175  * The following only work if pte_present() is true.
 176  * Undefined behaviour if not..
 177  */
 178 extern inline int pte_read(pte_t pte) { return pte_val(pte) & _PAGE_USER; }
 179 extern inline int pte_exec(pte_t pte) { return pte_val(pte) & _PAGE_USER; }
 180 extern inline int pte_dirty(pte_t pte){ return pte_val(pte) & _PAGE_DIRTY; }
 181 extern inline int pte_young(pte_t pte){ return pte_val(pte) & _PAGE_ACCESSED; }
 182 extern inline int pte_write(pte_t pte){ return pte_val(pte) & _PAGE_RW; }
 183
 184 extern inline pte_t pte_rdprotect(pte_t pte)    { set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_USER)); return pte; }
 185 extern inline pte_t pte_exprotect(pte_t pte)    { set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_USER)); return pte; }
 186 extern inline pte_t pte_mkclean(pte_t pte)      { set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_DIRTY)); return pte; }
 187 extern inline pte_t pte_mkold(pte_t pte)        { set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_ACCESSED)); return pte; }
 188 extern inline pte_t pte_wrprotect(pte_t pte)    { set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_RW)); return pte; }
 189 extern inline pte_t pte_mkread(pte_t pte)       { set_pte(&pte, __pte(pte_val(pte) | _PAGE_USER)); return pte; }
 190 extern inline pte_t pte_mkexec(pte_t pte)       { set_pte(&pte, __pte(pte_val(pte) | _PAGE_USER)); return pte; }
 191 extern inline pte_t pte_mkdirty(pte_t pte)      { set_pte(&pte, __pte(pte_val(pte) | _PAGE_DIRTY)); return pte; }
 192 extern inline pte_t pte_mkyoung(pte_t pte)      { set_pte(&pte, __pte(pte_val(pte) | _PAGE_ACCESSED)); return pte; }
 193 extern inline pte_t pte_mkwrite(pte_t pte)      { set_pte(&pte, __pte(pte_val(pte) | _PAGE_RW)); return pte; }
 194
 195 /*
 196  * Conversion functions: convert a page and protection to a page entry,
 197  * and a page entry and page directory to the page they refer to.
 198  *
 199  * extern pte_t mk_pte(struct page *page, pgprot_t pgprot)
 200  */
 201 #define mk_pte(page,pgprot)                                             \
 202 ({      pte_t __pte;                                                    \
 203                                                                         \
 204         set_pte(&__pte, __pte(((page)-mem_map) *                        \
 205                 (unsigned long long)PAGE_SIZE + pgprot_val(pgprot) +    \
 206                 __MEMORY_START));                                       \
 207         __pte;                                                          \
 208 })
 209
 210 /* This takes a physical page address that is used by the remapping functions */
 211 #define mk_pte_phys(physpage, pgprot) \
 212 ({ pte_t __pte; set_pte(&__pte, __pte(physpage + pgprot_val(pgprot))); __pte; })
 213
 214 extern inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 215 { set_pte(&pte, __pte((pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot))); return pte; }
 216
 217 #define page_pte(page) page_pte_prot(page, __pgprot(0))
 218
 219 #define pmd_page(pmd) \
 220 ((unsigned long) __va(pmd_val(pmd) & PAGE_MASK))
 221
 222 /* to find an entry in a page-table-directory. */
 223 #define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD-1))
 224 #define __pgd_offset(address) pgd_index(address)
 225 #define pgd_offset(mm, address) ((mm)->pgd+pgd_index(address))
 226
 227 /* to find an entry in a kernel page-table-directory */
 228 #define pgd_offset_k(address) pgd_offset(&init_mm, address)
 229
 230 #define __pmd_offset(address) \
 231                 (((address) >> PMD_SHIFT) & (PTRS_PER_PMD-1))
 232
 233 /* Find an entry in the third-level page table.. */
 234 #define __pte_offset(address) \
 235                 ((address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
 236 #define pte_offset(dir, address) ((pte_t *) pmd_page(*(dir)) + \
 237                         __pte_offset(address))
 238
 239 extern void update_mmu_cache(struct vm_area_struct * vma,
 240                              unsigned long address, pte_t pte);
 241
 242 /* Encode and de-code a swap entry */
 243 #define SWP_TYPE(x)                     (((x).val >> 1) & 0x3f)
 244 #define SWP_OFFSET(x)                   ((x).val >> 8)
 245 #define SWP_ENTRY(type, offset)         ((swp_entry_t) { ((type) << 1) | ((offset) << 8) })
 246 #define pte_to_swp_entry(pte)           ((swp_entry_t) { pte_val(pte) })
 247 #define swp_entry_to_pte(x)             ((pte_t) { (x).val })
 248
 249 #define module_map      vmalloc
 250 #define module_unmap    vfree
 251
 252 #endif /* !__ASSEMBLY__ */
 253
 254 /* Needs to be defined here and not in linux/mm.h, as it is arch dependent */
 255 #define PageSkip(page)          (0)
 256 #define kern_addr_valid(addr)   (1)
 257
 258 #define io_remap_page_range remap_page_range
 259
 260 #endif /* __ASM_SH_PAGE_H */