include/asm-mips/page.h

/* */
This source file includes following definitions.
pte_none
pte_present
pte_clear
pgd_none
pgd_bad
pgd_present
pgd_clear
pte_read
pte_write
pte_exec
pte_dirty
pte_young
pte_cow
pte_wrprotect
pte_rdprotect
pte_exprotect
pte_mkclean
pte_mkold
pte_uncow
pte_mkwrite
pte_mkread
pte_mkexec
pte_mkdirty
pte_mkyoung
pte_mkcow
mk_pte
pte_modify
pte_page
pgd_page
pgd_set
   1 #ifndef __ASM_MIPS_PAGE_H
   2 #define __ASM_MIPS_PAGE_H
   3 
   4 #define CONFIG_STRICT_MM_TYPECHECKS
   5 
   6 #ifndef __ASSEMBLY__
   7 
   8 #include <linux/linkage.h>
   9 
  10 #define invalidate()    tlbflush();
  11 extern asmlinkage void tlbflush(void);
  12 
  13 typedef unsigned short mem_map_t;
  14 
  15 #ifdef CONFIG_STRICT_MM_TYPECHECKS
  16 /*
  17  * These are used to make use of C type-checking..
  18  */
  19 typedef struct { unsigned long pte; } pte_t;
  20 typedef struct { unsigned long pgd; } pgd_t;
  21 typedef struct { unsigned long pgprot; } pgprot_t;
  22 
  23 #define pte_val(x)      ((x).pte)
  24 #define pgd_val(x)      ((x).pgd)
  25 #define pgprot_val(x)   ((x).pgprot)
  26 
  27 #define __pte(x)        ((pte_t) { (x) } )
  28 #define __pgd(x)        ((pgd_t) { (x) } )
  29 #define __pgprot(x)     ((pgprot_t) { (x) } )
  30 
  31 #else /* !defined (CONFIG_STRICT_MM_TYPECHECKS) */
  32 /*
  33  * .. while these make it easier on the compiler
  34  */
  35 typedef unsigned long pte_t;
  36 typedef unsigned long pgd_t;
  37 typedef unsigned long pgprot_t;
  38 
  39 #define pte_val(x)      (x)
  40 #define pgd_val(x)      (x)
  41 #define pgprot_val(x)   (x)
  42 
  43 #define __pte(x)        (x)
  44 #define __pgd(x)        (x)
  45 #define __pgprot(x)     (x)
  46 
  47 #endif /* !defined (CONFIG_STRICT_MM_TYPECHECKS) */
  48 #endif /* __ASSEMBLY__ */
  49 
  50 /*
  51  * Note that we shift the lower 32bits of each EntryLo[01] entry
  52  * 6 bits to the left. That way we can convert the PFN into the
  53  * physical address by a single 'and' operation and gain 6 additional
  54  * bits for storing information which isn't present in a normal
  55  * MIPS page table.
  56  */
  57 #define _PAGE_PRESENT               (1<<0)  /* implemented in software */
  58 #define _PAGE_COW                   (1<<1)  /* implemented in software */
  59 #define _PAGE_DIRTY                 (1<<2)  /* implemented in software */
  60 #define _PAGE_USER                  (1<<3)
  61 #define _PAGE_UNUSED1               (1<<4)
  62 #define _PAGE_UNUSED2               (1<<5)
  63 #define _PAGE_GLOBAL                (1<<6)
  64 #define _PAGE_ACCESSED              (1<<7)   /* The MIPS valid bit      */
  65 #define _PAGE_RW                    (1<<8)   /* The MIPS dirty bit      */
  66 #define _CACHE_CACHABLE_NO_WA       (0<<9)
  67 #define _CACHE_CACHABLE_WA          (1<<9)
  68 #define _CACHE_UNCACHED             (2<<9)
  69 #define _CACHE_CACHABLE_NONCOHERENT (3<<9)
  70 #define _CACHE_CACHABLE_CE          (4<<9)
  71 #define _CACHE_CACHABLE_COW         (5<<9)
  72 #define _CACHE_CACHABLE_CUW         (6<<9)
  73 #define _CACHE_MASK                 (7<<9)
  74 
  75 #define _PAGE_TABLE     (_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | _PAGE_ACCESSED | _PAGE_DIRTY | \
  76                          _CACHE_CACHABLE_NO_WA)
  77 
  78 #define _PAGE_CHG_MASK  (PAGE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY | _CACHE_MASK)
  79 
  80 #define PAGE_NONE       __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED)
  81 #define PAGE_SHARED     __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | _PAGE_ACCESSED | _CACHE_CACHABLE_NO_WA)
  82 #define PAGE_COPY       __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED | _PAGE_COW | _CACHE_CACHABLE_NO_WA)
  83 #define PAGE_READONLY   __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED | _CACHE_CACHABLE_NO_WA)
  84 #define PAGE_KERNEL     __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_ACCESSED)
  85 
  86 /*
  87  * MIPS can't do page protection for execute, and considers that the same like
  88  * read. Also, write permissions imply read permissions. This is the closest
  89  * we can get by reasonable means..
  90  */
  91 #define __P000  PAGE_NONE
  92 #define __P001  PAGE_READONLY
  93 #define __P010  PAGE_COPY
  94 #define __P011  PAGE_COPY
  95 #define __P100  PAGE_READONLY
  96 #define __P101  PAGE_READONLY
  97 #define __P110  PAGE_COPY
  98 #define __P111  PAGE_COPY
  99 
 100 #define __S000  PAGE_NONE
 101 #define __S001  PAGE_READONLY
 102 #define __S010  PAGE_SHARED
 103 #define __S011  PAGE_SHARED
 104 #define __S100  PAGE_READONLY
 105 #define __S101  PAGE_READONLY
 106 #define __S110  PAGE_SHARED
 107 #define __S111  PAGE_SHARED
 108 
 109 /* PAGE_SHIFT determines the page size */
 110 #define PAGE_SHIFT                      12
 111 #define PGDIR_SHIFT                     22
 112 #define PAGE_SIZE                       (1UL << PAGE_SHIFT)
 113 #define PGDIR_SIZE                      (1UL << PGDIR_SHIFT)
 114 
 115 #ifdef __KERNEL__
 116 
 117 #define PAGE_OFFSET     KERNELBASE
 118 #define MAP_NR(addr)    (((addr) - PAGE_OFFSET) >> PAGE_SHIFT)
 119 #define MAP_PAGE_RESERVED (1<<15)
 120 
 121 #if !defined (__ASSEMBLY__)
 122 
 123 /* page table for 0-4MB for everybody */
 124 extern unsigned long pg0[1024];
 125 
 126 /*
 127  * BAD_PAGETABLE is used when we need a bogus page-table, while
 128  * BAD_PAGE is used for a bogus page.
 129  *
 130  * ZERO_PAGE is a global shared page that is always zero: used
 131  * for zero-mapped memory areas etc..
 132  */
 133 extern pte_t __bad_page(void);
 134 extern pte_t * __bad_pagetable(void);
 135 
 136 extern unsigned long __zero_page(void);
 137 
 138 #define BAD_PAGETABLE __bad_pagetable()
 139 #define BAD_PAGE __bad_page()
 140 #define ZERO_PAGE __zero_page()
 141 
 142 /* number of bits that fit into a memory pointer */
 143 #define BITS_PER_PTR                    (8*sizeof(unsigned long))
 144 
 145 /* to mask away the intra-page address bits */
 146 #define PAGE_MASK                       (~(PAGE_SIZE-1))
 147 
 148 /* to mask away the intra-page address bits */
 149 #define PGDIR_MASK                      (~(PGDIR_SIZE-1))
 150 
 151 /* to align the pointer to the (next) page boundary */
 152 #define PAGE_ALIGN(addr)                (((addr)+PAGE_SIZE-1)&PAGE_MASK)
 153 
 154 /* to align the pointer to a pointer address */
 155 #define PTR_MASK                        (~(sizeof(void*)-1))
 156 
 157 /* sizeof(void*)==1<<SIZEOF_PTR_LOG2 */
 158 /* 64-bit machines, beware!  SRB. */
 159 #define SIZEOF_PTR_LOG2                 2
 160 
 161 /* to find an entry in a page-table-directory */
 162 #define PAGE_DIR_OFFSET(tsk,address) \
 163 ((((unsigned long)(address)) >> PGDIR_SHIFT) + (pgd_t *) (tsk)->tss.pg_dir)
 164 
 165 /* to find an entry in a page-table */
 166 #define PAGE_PTR(address) \
 167 ((unsigned long)(address)>>(PAGE_SHIFT-SIZEOF_PTR_LOG2)&PTR_MASK&~PAGE_MASK)
 168 
 169 /* the no. of pointers that fit on a page */
 170 #define PTRS_PER_PAGE                   (PAGE_SIZE/sizeof(void*))
 171 
 172 /* to set the page-dir */
 173 #define SET_PAGE_DIR(tsk,pgdir) \
 174 do { \
 175         (tsk)->tss.pg_dir = (unsigned long) (pgdir); \
 176         if ((tsk) == current) \
 177                 invalidate(); \
 178 } while (0)
 179 
 180 extern unsigned long high_memory;
 181 
 182 extern inline int pte_none(pte_t pte)           { return !pte_val(pte); }
     /*  */
 183 extern inline int pte_present(pte_t pte)        { return pte_val(pte) & _PAGE_PRESENT; }
     /*  */
 184 extern inline void pte_clear(pte_t *ptep)       { pte_val(*ptep) = 0; }
     /*  */
 185 
 186 extern inline int pgd_none(pgd_t pgd)           { return !pgd_val(pgd); }
     /*  */
 187 extern inline int pgd_bad(pgd_t pgd)            { return (pgd_val(pgd) & ~PAGE_MASK) != _PAGE_TABLE || pgd_val(pgd) > high_memory; }
     /*  */
 188 extern inline int pgd_present(pgd_t pgd)        { return pgd_val(pgd) & _PAGE_PRESENT; }
     /*  */
 189 extern inline void pgd_clear(pgd_t * pgdp)      { pgd_val(*pgdp) = 0; }
     /*  */
 190 
 191 /*
 192  * The following only work if pte_present() is true.
 193  * Undefined behaviour if not..
 194  */
 195 extern inline int pte_read(pte_t pte)           { return pte_val(pte) & _PAGE_USER; }
     /*  */
 196 extern inline int pte_write(pte_t pte)          { return pte_val(pte) & _PAGE_RW; }
     /*  */
 197 extern inline int pte_exec(pte_t pte)           { return pte_val(pte) & _PAGE_USER; }
     /*  */
 198 extern inline int pte_dirty(pte_t pte)          { return pte_val(pte) & _PAGE_DIRTY; }
     /*  */
 199 extern inline int pte_young(pte_t pte)          { return pte_val(pte) & _PAGE_ACCESSED; }
     /*  */
 200 extern inline int pte_cow(pte_t pte)            { return pte_val(pte) & _PAGE_COW; }
     /*  */
 201 
 202 extern inline pte_t pte_wrprotect(pte_t pte)    { pte_val(pte) &= ~_PAGE_RW; return pte; }
     /*  */
 203 extern inline pte_t pte_rdprotect(pte_t pte)    { pte_val(pte) &= ~_PAGE_USER; return pte; }
     /*  */
 204 extern inline pte_t pte_exprotect(pte_t pte)    { pte_val(pte) &= ~_PAGE_USER; return pte; }
     /*  */
 205 extern inline pte_t pte_mkclean(pte_t pte)      { pte_val(pte) &= ~_PAGE_DIRTY; return pte; }
     /*  */
 206 extern inline pte_t pte_mkold(pte_t pte)        { pte_val(pte) &= ~_PAGE_ACCESSED; return pte; }
     /*  */
 207 extern inline pte_t pte_uncow(pte_t pte)        { pte_val(pte) &= ~_PAGE_COW; return pte; }
     /*  */
 208 extern inline pte_t pte_mkwrite(pte_t pte)      { pte_val(pte) |= _PAGE_RW; return pte; }
     /*  */
 209 extern inline pte_t pte_mkread(pte_t pte)       { pte_val(pte) |= _PAGE_USER; return pte; }
     /*  */
 210 extern inline pte_t pte_mkexec(pte_t pte)       { pte_val(pte) |= _PAGE_USER; return pte; }
     /*  */
 211 extern inline pte_t pte_mkdirty(pte_t pte)      { pte_val(pte) |= _PAGE_DIRTY; return pte; }
     /*  */
 212 extern inline pte_t pte_mkyoung(pte_t pte)      { pte_val(pte) |= _PAGE_ACCESSED; return pte; }
     /*  */
 213 extern inline pte_t pte_mkcow(pte_t pte)        { pte_val(pte) |= _PAGE_COW; return pte; }
     /*  */
 214 
 215 /*
 216  * Conversion functions: convert a page and protection to a page entry,
 217  * and a page entry and page directory to the page they refer to.
 218  */
 219 extern inline pte_t mk_pte(unsigned long page, pgprot_t pgprot)
     /*  */
 220 { pte_t pte; pte_val(pte) = page | pgprot_val(pgprot); return pte; }
 221 
 222 extern inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
     /*  */
 223 { pte_val(pte) = (pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot); return pte; }
 224 
 225 extern inline unsigned long pte_page(pte_t pte) { return pte_val(pte) & PAGE_MASK; }
     /*  */
 226 extern inline unsigned long pgd_page(pgd_t pgd) { return pgd_val(pgd) & PAGE_MASK; }
     /*  */
 227 
 228 extern inline void pgd_set(pgd_t * pgdp, pte_t * ptep)
     /*  */
 229 { pgd_val(*pgdp) = _PAGE_TABLE | (unsigned long) ptep; }
 230 
 231 #endif /* !defined (__ASSEMBLY__) */
 232 #endif /* defined (__KERNEL__) */
 233 
 234 #endif /* __ASM_MIPS_PAGE_H */
/* */
root/include/asm-mips/page.h

INCLUDED FROM

DEFINITIONS
