include/asm-m68k/page.h

   1 #ifndef _M68K_PAGE_H
   2 #define _M68K_PAGE_H
   3
   4 /* PAGE_SHIFT determines the page size */
   5 #define PAGE_SHIFT      12
   6 #define PAGE_SIZE       (1UL << PAGE_SHIFT)
   7 #define PAGE_MASK       (~(PAGE_SIZE-1))
   8
   9 #ifdef __KERNEL__
  10
  11 #include <asm/setup.h>
  12
  13 #define STRICT_MM_TYPECHECKS
  14
  15 #define get_user_page(vaddr)    __get_free_page(GFP_KERNEL)
  16 #define free_user_page(page, addr)      free_page(addr)
  17
  18 /*
  19  * We don't need to check for alignment etc.
  20  */
  21 #ifdef CPU_M68040_OR_M68060_ONLY
  22 static inline void copy_page(unsigned long to, unsigned long from)
  23 {
  24   unsigned long tmp;
  25
  26   __asm__ __volatile__("1:\t"
  27                        ".chip 68040\n\t"
  28                        "move16 %1@+,%0@+\n\t"
  29                        "move16 %1@+,%0@+\n\t"
  30                        ".chip 68k\n\t"
  31                        "dbra  %2,1b\n\t"
  32                        : "=a" (to), "=a" (from), "=d" (tmp)
  33                        : "0" (to), "1" (from) , "2" (PAGE_SIZE / 32 - 1)
  34                        );
  35 }
  36
  37 static inline void clear_page(unsigned long page)
  38 {
  39         unsigned long data, sp, tmp;
  40
  41         sp = page;
  42
  43         data = 0;
  44
  45         *((unsigned long *)(page))++ = 0;
  46         *((unsigned long *)(page))++ = 0;
  47         *((unsigned long *)(page))++ = 0;
  48         *((unsigned long *)(page))++ = 0;
  49
  50         __asm__ __volatile__("1:\t"
  51                              ".chip 68040\n\t"
  52                              "move16 %2@+,%0@+\n\t"
  53                              ".chip 68k\n\t"
  54                              "subqw  #8,%2\n\t"
  55                              "subqw  #8,%2\n\t"
  56                              "dbra   %1,1b\n\t"
  57                              : "=a" (page), "=d" (tmp)
  58                              : "a" (sp), "0" (page),
  59                                "1" ((PAGE_SIZE - 16) / 16 - 1));
  60 }
  61
  62 #else
  63 #define clear_page(page)        memset((void *)(page), 0, PAGE_SIZE)
  64 #define copy_page(to,from)      memcpy((void *)(to), (void *)(from), PAGE_SIZE)
  65 #endif
  66
  67 #ifdef STRICT_MM_TYPECHECKS
  68 /*
  69  * These are used to make use of C type-checking..
  70  */
  71 typedef struct { unsigned long pte; } pte_t;
  72 typedef struct { unsigned long pmd[16]; } pmd_t;
  73 typedef struct { unsigned long pgd; } pgd_t;
  74 typedef struct { unsigned long pgprot; } pgprot_t;
  75
  76 #define pte_val(x)      ((x).pte)
  77 #define pmd_val(x)      ((&x)->pmd[0])
  78 #define pgd_val(x)      ((x).pgd)
  79 #define pgprot_val(x)   ((x).pgprot)
  80
  81 #define __pte(x)        ((pte_t) { (x) } )
  82 #define __pmd(x)        ((pmd_t) { (x) } )
  83 #define __pgd(x)        ((pgd_t) { (x) } )
  84 #define __pgprot(x)     ((pgprot_t) { (x) } )
  85
  86 #else
  87 /*
  88  * .. while these make it easier on the compiler
  89  */
  90 typedef unsigned long pte_t;
  91 typedef struct { unsigned long pmd[16]; } pmd_t;
  92 typedef unsigned long pgd_t;
  93 typedef unsigned long pgprot_t;
  94
  95 #define pte_val(x)      (x)
  96 #define pmd_val(x)      ((&x)->pmd[0])
  97 #define pgd_val(x)      (x)
  98 #define pgprot_val(x)   (x)
  99
 100 #define __pte(x)        (x)
 101 #define __pmd(x)        ((pmd_t) { (x) } )
 102 #define __pgd(x)        (x)
 103 #define __pgprot(x)     (x)
 104
 105 #endif
 106
 107 /* to align the pointer to the (next) page boundary */
 108 #define PAGE_ALIGN(addr)        (((addr)+PAGE_SIZE-1)&PAGE_MASK)
 109
 110 /* This handles the memory map.. */
 111 #define PAGE_OFFSET             0
 112 #define __pa(x)                 ((unsigned long)(x)-PAGE_OFFSET)
 113 #define __va(x)                 ((void *)((unsigned long)(x)+PAGE_OFFSET))
 114 #define MAP_NR(addr)            (__pa(addr) >> PAGE_SHIFT)
 115
 116 #endif /* __KERNEL__ */
 117
 118 #endif /* _M68K_PAGE_H */