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_dcache_page(pg) flushes(wback&invalidates) a page for dcache
  27  *  - flush_page_to_ram(page) write back kernel page to ram
  28  *  - flush_icache_range(start, end) flushes(invalidates) a range for icache
  29  *  - flush_icache_page(vma, pg) flushes(invalidates) a page for icache
  30  *
  31  *  Caches are indexed (effectively) by physical address on SH-3, so
  32  *  we don't need them.
  33  */
  34 #define flush_cache_all()                       do { } while (0)
  35 #define flush_cache_mm(mm)                      do { } while (0)
  36 #define flush_cache_range(mm, start, end)       do { } while (0)
  37 #define flush_cache_page(vma, vmaddr)           do { } while (0)
  38 #define flush_page_to_ram(page)                 do { } while (0)
  39 #define flush_dcache_page(page)                 do { } while (0)
  40 #define flush_icache_range(start, end)          do { } while (0)
  41 #define flush_icache_page(vma,pg)               do { } while (0)
  42 #elif defined(__SH4__)
  43 /*
  44  *  Caches are broken on SH-4, so we need them.
  45  */
  46 extern void flush_cache_all(void);
  47 extern void flush_cache_mm(struct mm_struct *mm);
  48 extern void flush_cache_range(struct mm_struct *mm, unsigned long start,
  49                               unsigned long end);
  50 extern void flush_cache_page(struct vm_area_struct *vma, unsigned long addr);
  51 extern void flush_page_to_ram(struct page *page);
  52 extern void flush_dcache_page(struct page *pg);
  53 extern void flush_icache_range(unsigned long start, unsigned long end);
  54 extern void flush_icache_page(struct vm_area_struct *vma, struct page *pg);
  55 #endif
  56
  57 /*
  58  * Basically we have the same two-level (which is the logical three level
  59  * Linux page table layout folded) page tables as the i386.
  60  */
  61
  62 /*
  63  * ZERO_PAGE is a global shared page that is always zero: used
  64  * for zero-mapped memory areas etc..
  65  */
  66 extern unsigned long empty_zero_page[1024];
  67 #define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
  68
  69 #endif /* !__ASSEMBLY__ */
  70
  71 #include <asm/pgtable-2level.h>
  72
  73 #define __beep() asm("")
  74
  75 #define PMD_SIZE        (1UL << PMD_SHIFT)
  76 #define PMD_MASK        (~(PMD_SIZE-1))
  77 #define PGDIR_SIZE      (1UL << PGDIR_SHIFT)
  78 #define PGDIR_MASK      (~(PGDIR_SIZE-1))
  79
  80 #define USER_PTRS_PER_PGD       (TASK_SIZE/PGDIR_SIZE)
  81 #define FIRST_USER_PGD_NR       0
  82
  83 #define USER_PGD_PTRS (PAGE_OFFSET >> PGDIR_SHIFT)
  84 #define KERNEL_PGD_PTRS (PTRS_PER_PGD-USER_PGD_PTRS)
  85
  86 #define TWOLEVEL_PGDIR_SHIFT    22
  87 #define BOOT_USER_PGD_PTRS (PAGE_OFFSET >> TWOLEVEL_PGDIR_SHIFT)
  88 #define BOOT_KERNEL_PGD_PTRS (1024-BOOT_USER_PGD_PTRS)
  89
  90 #ifndef __ASSEMBLY__
  91 #define VMALLOC_START   P3SEG
  92 #define VMALLOC_VMADDR(x) ((unsigned long)(x))
  93 #define VMALLOC_END     P4SEG
  94
  95 /*                      0x001     WT-bit on SH-4, 0 on SH-3 */
  96 #define _PAGE_HW_SHARED 0x002  /* SH-bit  : page is shared among processes */
  97 #define _PAGE_DIRTY     0x004  /* D-bit   : page changed */
  98 #define _PAGE_CACHABLE  0x008  /* C-bit   : cachable */
  99 /*                      0x010     SZ0-bit : Size of page */
 100 #define _PAGE_RW        0x020  /* PR0-bit : write access allowed */
 101 #define _PAGE_USER      0x040  /* PR1-bit : user space access allowed */
 102 /*                      0x080     SZ1-bit : Size of page (on SH-4) */
 103 #define _PAGE_PRESENT   0x100  /* V-bit   : page is valid */
 104 #define _PAGE_PROTNONE  0x200  /* software: if not present  */
 105 #define _PAGE_ACCESSED  0x400  /* software: page referenced */
 106 #define _PAGE_U0_SHARED 0x800  /* software: page is shared in user space */
 107
 108 /* Mask which drop software flags */
 109 #define _PAGE_FLAGS_HARDWARE_MASK       0x1ffff1ff
 110 /* Hardware flags: SZ=1 (4k-byte) */
 111 #define _PAGE_FLAGS_HARD                0x00000010
 112
 113 #if defined(__sh3__)
 114 #define _PAGE_SHARED    _PAGE_HW_SHARED
 115 #elif defined(__SH4__)
 116 #define _PAGE_SHARED    _PAGE_U0_SHARED
 117 #endif
 118
 119 #define _PAGE_TABLE     (_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | _PAGE_ACCESSED | _PAGE_DIRTY)
 120 #define _KERNPG_TABLE   (_PAGE_PRESENT | _PAGE_RW | _PAGE_ACCESSED | _PAGE_DIRTY)
 121 #define _PAGE_CHG_MASK  (PTE_MASK | _PAGE_ACCESSED | _PAGE_CACHABLE | _PAGE_DIRTY | _PAGE_SHARED)
 122
 123 #define PAGE_NONE       __pgprot(_PAGE_PROTNONE | _PAGE_CACHABLE |_PAGE_ACCESSED | _PAGE_FLAGS_HARD)
 124 #define PAGE_SHARED     __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | _PAGE_CACHABLE |_PAGE_ACCESSED | _PAGE_SHARED | _PAGE_FLAGS_HARD)
 125 #define PAGE_COPY       __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_CACHABLE | _PAGE_ACCESSED | _PAGE_FLAGS_HARD)
 126 #define PAGE_READONLY   __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_CACHABLE | _PAGE_ACCESSED | _PAGE_FLAGS_HARD)
 127 #define PAGE_KERNEL     __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_CACHABLE | _PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_HW_SHARED | _PAGE_FLAGS_HARD)
 128 #define PAGE_KERNEL_RO  __pgprot(_PAGE_PRESENT | _PAGE_CACHABLE | _PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_HW_SHARED | _PAGE_FLAGS_HARD)
 129
 130 /*
 131  * As i386 and MIPS, SuperH can't do page protection for execute, and
 132  * considers that the same as a read.  Also, write permissions imply
 133  * read permissions. This is the closest we can get..
 134  */
 135
 136 #define __P000  PAGE_NONE
 137 #define __P001  PAGE_READONLY
 138 #define __P010  PAGE_COPY
 139 #define __P011  PAGE_COPY
 140 #define __P100  PAGE_READONLY
 141 #define __P101  PAGE_READONLY
 142 #define __P110  PAGE_COPY
 143 #define __P111  PAGE_COPY
 144
 145 #define __S000  PAGE_NONE
 146 #define __S001  PAGE_READONLY
 147 #define __S010  PAGE_SHARED
 148 #define __S011  PAGE_SHARED
 149 #define __S100  PAGE_READONLY
 150 #define __S101  PAGE_READONLY
 151 #define __S110  PAGE_SHARED
 152 #define __S111  PAGE_SHARED
 153
 154 /*
 155  * Handling allocation failures during page table setup.
 156  */
 157 extern void __handle_bad_pmd(pmd_t * pmd);
 158 extern void __handle_bad_pmd_kernel(pmd_t * pmd);
 159
 160 #define pte_none(x)     (!pte_val(x))
 161 #define pte_present(x)  (pte_val(x) & (_PAGE_PRESENT | _PAGE_PROTNONE))
 162 #define pte_clear(xp)   do { set_pte(xp, __pte(0)); } while (0)
 163
 164 #define pmd_none(x)     (!pmd_val(x))
 165 #define pmd_present(x)  (pmd_val(x) & _PAGE_PRESENT)
 166 #define pmd_clear(xp)   do { set_pmd(xp, __pmd(0)); } while (0)
 167 #define pmd_bad(x)      ((pmd_val(x) & (~PAGE_MASK & ~_PAGE_USER)) != _KERNPG_TABLE)
 168
 169 /*
 170  * Permanent address of a page. Obviously must never be
 171  * called on a highmem page.
 172  */
 173 #define page_address(page)  ((page)->virtual)
 174 #define pages_to_mb(x) ((x) >> (20-PAGE_SHIFT))
 175 #define pte_page(x) (mem_map+(unsigned long)(((pte_val(x) -__MEMORY_START) >> PAGE_SHIFT)))
 176
 177 /*
 178  * The following only work if pte_present() is true.
 179  * Undefined behaviour if not..
 180  */
 181 extern inline int pte_read(pte_t pte) { return pte_val(pte) & _PAGE_USER; }
 182 extern inline int pte_exec(pte_t pte) { return pte_val(pte) & _PAGE_USER; }
 183 extern inline int pte_dirty(pte_t pte){ return pte_val(pte) & _PAGE_DIRTY; }
 184 extern inline int pte_young(pte_t pte){ return pte_val(pte) & _PAGE_ACCESSED; }
 185 extern inline int pte_write(pte_t pte){ return pte_val(pte) & _PAGE_RW; }
 186 extern inline int pte_shared(pte_t pte){ return pte_val(pte) & _PAGE_SHARED; }
 187
 188 extern inline pte_t pte_rdprotect(pte_t pte)    { set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_USER)); return pte; }
 189 extern inline pte_t pte_exprotect(pte_t pte)    { set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_USER)); return pte; }
 190 extern inline pte_t pte_mkclean(pte_t pte)      { set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_DIRTY)); return pte; }
 191 extern inline pte_t pte_mkold(pte_t pte)        { set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_ACCESSED)); return pte; }
 192 extern inline pte_t pte_wrprotect(pte_t pte)    { set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_RW)); return pte; }
 193 extern inline pte_t pte_mkread(pte_t pte)       { set_pte(&pte, __pte(pte_val(pte) | _PAGE_USER)); return pte; }
 194 extern inline pte_t pte_mkexec(pte_t pte)       { set_pte(&pte, __pte(pte_val(pte) | _PAGE_USER)); return pte; }
 195 extern inline pte_t pte_mkdirty(pte_t pte)      { set_pte(&pte, __pte(pte_val(pte) | _PAGE_DIRTY)); return pte; }
 196 extern inline pte_t pte_mkyoung(pte_t pte)      { set_pte(&pte, __pte(pte_val(pte) | _PAGE_ACCESSED)); return pte; }
 197 extern inline pte_t pte_mkwrite(pte_t pte)      { set_pte(&pte, __pte(pte_val(pte) | _PAGE_RW)); return pte; }
 198
 199 /*
 200  * Conversion functions: convert a page and protection to a page entry,
 201  * and a page entry and page directory to the page they refer to.
 202  *
 203  * extern pte_t mk_pte(struct page *page, pgprot_t pgprot)
 204  */
 205 #define mk_pte(page,pgprot)                                             \
 206 ({      pte_t __pte;                                                    \
 207                                                                         \
 208         set_pte(&__pte, __pte(((page)-mem_map) *                        \
 209                 (unsigned long long)PAGE_SIZE + pgprot_val(pgprot) +    \
 210                 __MEMORY_START));                                       \
 211         __pte;                                                          \
 212 })
 213
 214 /* This takes a physical page address that is used by the remapping functions */
 215 #define mk_pte_phys(physpage, pgprot) \
 216 ({ pte_t __pte; set_pte(&__pte, __pte(physpage + pgprot_val(pgprot))); __pte; })
 217
 218 extern inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 219 { set_pte(&pte, __pte((pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot))); return pte; }
 220
 221 #define page_pte(page) page_pte_prot(page, __pgprot(0))
 222
 223 #define pmd_page(pmd) \
 224 ((unsigned long) __va(pmd_val(pmd) & PAGE_MASK))
 225
 226 /* to find an entry in a page-table-directory. */
 227 #define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD-1))
 228 #define __pgd_offset(address) pgd_index(address)
 229 #define pgd_offset(mm, address) ((mm)->pgd+pgd_index(address))
 230
 231 /* to find an entry in a kernel page-table-directory */
 232 #define pgd_offset_k(address) pgd_offset(&init_mm, address)
 233
 234 #define __pmd_offset(address) \
 235                 (((address) >> PMD_SHIFT) & (PTRS_PER_PMD-1))
 236
 237 /* Find an entry in the third-level page table.. */
 238 #define __pte_offset(address) \
 239                 ((address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
 240 #define pte_offset(dir, address) ((pte_t *) pmd_page(*(dir)) + \
 241                         __pte_offset(address))
 242
 243 extern void update_mmu_cache(struct vm_area_struct * vma,
 244                              unsigned long address, pte_t pte);
 245
 246 /* Encode and de-code a swap entry */
 247 /*
 248  * NOTE: We should set ZEROs at the position of _PAGE_PRESENT
 249  *       and _PAGE_PROTONOE bits
 250  */
 251 #define SWP_TYPE(x)             ((x).val & 0xff)
 252 #define SWP_OFFSET(x)           ((x).val >> 10)
 253 #define SWP_ENTRY(type, offset) ((swp_entry_t) { (type) | ((offset) << 10) })
 254 #define pte_to_swp_entry(pte)   ((swp_entry_t) { pte_val(pte) })
 255 #define swp_entry_to_pte(x)     ((pte_t) { (x).val })
 256
 257 #include <asm-generic/pgtable.h>
 258
 259 #endif /* !__ASSEMBLY__ */
 260
 261 /* Needs to be defined here and not in linux/mm.h, as it is arch dependent */
 262 #define PageSkip(page)          (0)
 263 #define kern_addr_valid(addr)   (1)
 264
 265 #define io_remap_page_range remap_page_range
 266
 267 #endif /* __ASM_SH_PAGE_H */