include/asm-arm/proc-armo/pgtable.h

   1 /*
   2  *  linux/include/asm-arm/proc-armo/pgtable.h
   3  *
   4  *  Copyright (C) 1995-1999 Russell King
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  *
  10  *  18-Oct-1997 RMK     Now two-level (32x32)
  11  */
  12 #ifndef __ASM_PROC_PGTABLE_H
  13 #define __ASM_PROC_PGTABLE_H
  14
  15 /*
  16  * entries per page directory level: they are two-level, so
  17  * we don't really have any PMD directory.
  18  */
  19 #define PTRS_PER_PTE            32
  20 #define PTRS_PER_PMD            1
  21 #define PTRS_PER_PGD            32
  22
  23 /*
  24  * The vmalloc() routines leaves a hole of 4kB between each vmalloced
  25  * area for the same reason. ;)
  26  */
  27 #define VMALLOC_START     0x01a00000
  28 #define VMALLOC_VMADDR(x) ((unsigned long)(x))
  29 #define VMALLOC_END       0x01c00000
  30
  31 #define _PAGE_TABLE     (0x01)
  32
  33 #define pmd_bad(pmd)            ((pmd_val(pmd) & 0xfc000002))
  34 #define set_pmd(pmdp,pmd)       ((*(pmdp)) = (pmd))
  35
  36 extern __inline__ pmd_t __mk_pmd(pte_t *ptep, unsigned long prot)
  37 {
  38         unsigned long pte_ptr = (unsigned long)ptep;
  39         pmd_t pmd;
  40
  41         pmd_val(pmd) = __virt_to_phys(pte_ptr) | prot;
  42
  43         return pmd;
  44 }
  45
  46 /* these are aliases for the above function */
  47 #define mk_user_pmd(ptep)       __mk_pmd(ptep, _PAGE_TABLE)
  48 #define mk_kernel_pmd(ptep)     __mk_pmd(ptep, _PAGE_TABLE)
  49
  50 extern __inline__ unsigned long pmd_page(pmd_t pmd)
  51 {
  52         return __phys_to_virt(pmd_val(pmd) & ~_PAGE_TABLE);
  53 }
  54
  55 #define set_pte(pteptr, pteval) ((*(pteptr)) = (pteval))
  56
  57 #define _PAGE_PRESENT   0x01
  58 #define _PAGE_READONLY  0x02
  59 #define _PAGE_NOT_USER  0x04
  60 #define _PAGE_OLD       0x08
  61 #define _PAGE_CLEAN     0x10
  62
  63 /*                               -- present --   -- !dirty --  --- !write ---   ---- !user --- */
  64 #define PAGE_NONE       __pgprot(_PAGE_PRESENT | _PAGE_CLEAN | _PAGE_READONLY | _PAGE_NOT_USER)
  65 #define PAGE_SHARED     __pgprot(_PAGE_PRESENT | _PAGE_CLEAN                                  )
  66 #define PAGE_COPY       __pgprot(_PAGE_PRESENT | _PAGE_CLEAN | _PAGE_READONLY                 )
  67 #define PAGE_READONLY   __pgprot(_PAGE_PRESENT | _PAGE_CLEAN | _PAGE_READONLY                 )
  68 #define PAGE_KERNEL     __pgprot(_PAGE_PRESENT                                | _PAGE_NOT_USER)
  69
  70 #define _PAGE_CHG_MASK  (PAGE_MASK | _PAGE_OLD | _PAGE_CLEAN)
  71
  72
  73 /*
  74  * The following only work if pte_present() is true.
  75  * Undefined behaviour if not..
  76  */
  77 #define pte_present(pte)                (pte_val(pte) & _PAGE_PRESENT)
  78 #define pte_read(pte)                   (!(pte_val(pte) & _PAGE_NOT_USER))
  79 #define pte_write(pte)                  (!(pte_val(pte) & _PAGE_READONLY))
  80 #define pte_exec(pte)                   (!(pte_val(pte) & _PAGE_NOT_USER))
  81 #define pte_dirty(pte)                  (!(pte_val(pte) & _PAGE_CLEAN))
  82 #define pte_young(pte)                  (!(pte_val(pte) & _PAGE_OLD))
  83
  84 extern inline pte_t pte_nocache(pte_t pte)      { return pte; }
  85 extern inline pte_t pte_wrprotect(pte_t pte)    { pte_val(pte) |= _PAGE_READONLY;  return pte; }
  86 extern inline pte_t pte_rdprotect(pte_t pte)    { pte_val(pte) |= _PAGE_NOT_USER;  return pte; }
  87 extern inline pte_t pte_exprotect(pte_t pte)    { pte_val(pte) |= _PAGE_NOT_USER;  return pte; }
  88 extern inline pte_t pte_mkclean(pte_t pte)      { pte_val(pte) |= _PAGE_CLEAN;     return pte; }
  89 extern inline pte_t pte_mkold(pte_t pte)        { pte_val(pte) |= _PAGE_OLD;       return pte; }
  90
  91 extern inline pte_t pte_mkwrite(pte_t pte)      { pte_val(pte) &= ~_PAGE_READONLY; return pte; }
  92 extern inline pte_t pte_mkread(pte_t pte)       { pte_val(pte) &= ~_PAGE_NOT_USER; return pte; }
  93 extern inline pte_t pte_mkexec(pte_t pte)       { pte_val(pte) &= ~_PAGE_NOT_USER; return pte; }
  94 extern inline pte_t pte_mkdirty(pte_t pte)      { pte_val(pte) &= ~_PAGE_CLEAN;    return pte; }
  95 extern inline pte_t pte_mkyoung(pte_t pte)      { pte_val(pte) &= ~_PAGE_OLD;      return pte; }
  96
  97 #define pte_alloc_kernel        pte_alloc
  98
  99 #endif /* __ASM_PROC_PGTABLE_H */