include/asm-m68k/page.h

   1 #ifndef _M68K_PAGE_H
   2 #define _M68K_PAGE_H
   3
   4 #include <linux/config.h>
   5
   6 /* PAGE_SHIFT determines the page size */
   7 #define PAGE_SHIFT      12
   8 #define PAGE_SIZE       (1UL << PAGE_SHIFT)
   9 #define PAGE_MASK       (~(PAGE_SIZE-1))
  10
  11 #ifdef __KERNEL__
  12
  13 #include <asm/setup.h>
  14
  15 #define STRICT_MM_TYPECHECKS
  16
  17 #define get_user_page(vaddr)    __get_free_page(GFP_KERNEL)
  18 #define free_user_page(page, addr)      free_page(addr)
  19
  20 /*
  21  * We don't need to check for alignment etc.
  22  */
  23 #ifdef CPU_M68040_OR_M68060_ONLY
  24 static inline void copy_page(unsigned long to, unsigned long from)
  25 {
  26   unsigned long tmp;
  27
  28   __asm__ __volatile__("1:\t"
  29                        ".chip 68040\n\t"
  30                        "move16 %1@+,%0@+\n\t"
  31                        "move16 %1@+,%0@+\n\t"
  32                        ".chip 68k\n\t"
  33                        "dbra  %2,1b\n\t"
  34                        : "=a" (to), "=a" (from), "=d" (tmp)
  35                        : "0" (to), "1" (from) , "2" (PAGE_SIZE / 32 - 1)
  36                        );
  37 }
  38
  39 static inline void clear_page(unsigned long page)
  40 {
  41         unsigned long data, sp, tmp;
  42
  43         sp = page;
  44
  45         data = 0;
  46
  47         *((unsigned long *)(page))++ = 0;
  48         *((unsigned long *)(page))++ = 0;
  49         *((unsigned long *)(page))++ = 0;
  50         *((unsigned long *)(page))++ = 0;
  51
  52         __asm__ __volatile__("1:\t"
  53                              ".chip 68040\n\t"
  54                              "move16 %2@+,%0@+\n\t"
  55                              ".chip 68k\n\t"
  56                              "subqw  #8,%2\n\t"
  57                              "subqw  #8,%2\n\t"
  58                              "dbra   %1,1b\n\t"
  59                              : "=a" (page), "=d" (tmp)
  60                              : "a" (sp), "0" (page),
  61                                "1" ((PAGE_SIZE - 16) / 16 - 1));
  62 }
  63
  64 #else
  65 #define clear_page(page)        memset((void *)(page), 0, PAGE_SIZE)
  66 #define copy_page(to,from)      memcpy((void *)(to), (void *)(from), PAGE_SIZE)
  67 #endif
  68
  69 #ifdef STRICT_MM_TYPECHECKS
  70 /*
  71  * These are used to make use of C type-checking..
  72  */
  73 typedef struct { unsigned long pte; } pte_t;
  74 typedef struct { unsigned long pmd[16]; } pmd_t;
  75 typedef struct { unsigned long pgd; } pgd_t;
  76 typedef struct { unsigned long pgprot; } pgprot_t;
  77
  78 #define pte_val(x)      ((x).pte)
  79 #define pmd_val(x)      ((&x)->pmd[0])
  80 #define pgd_val(x)      ((x).pgd)
  81 #define pgprot_val(x)   ((x).pgprot)
  82
  83 #define __pte(x)        ((pte_t) { (x) } )
  84 #define __pmd(x)        ((pmd_t) { (x) } )
  85 #define __pgd(x)        ((pgd_t) { (x) } )
  86 #define __pgprot(x)     ((pgprot_t) { (x) } )
  87
  88 #else
  89 /*
  90  * .. while these make it easier on the compiler
  91  */
  92 typedef unsigned long pte_t;
  93 typedef struct { unsigned long pmd[16]; } pmd_t;
  94 typedef unsigned long pgd_t;
  95 typedef unsigned long pgprot_t;
  96
  97 #define pte_val(x)      (x)
  98 #define pmd_val(x)      ((&x)->pmd[0])
  99 #define pgd_val(x)      (x)
 100 #define pgprot_val(x)   (x)
 101
 102 #define __pte(x)        (x)
 103 #define __pmd(x)        ((pmd_t) { (x) } )
 104 #define __pgd(x)        (x)
 105 #define __pgprot(x)     (x)
 106
 107 #endif
 108
 109 /* to align the pointer to the (next) page boundary */
 110 #define PAGE_ALIGN(addr)        (((addr)+PAGE_SIZE-1)&PAGE_MASK)
 111
 112 /* This handles the memory map.. */
 113 #define PAGE_OFFSET             0
 114 #define __pa(x)                 ((unsigned long)(x)-PAGE_OFFSET)
 115 /*
 116  * A hacky workaround for the problems with mmap() of frame buffer
 117  * memory in the lower 16MB physical memoryspace.
 118  *
 119  * This is a short term solution, we will have to deal properly
 120  * with this in 2.3.x.
 121  */
 122 extern inline void *__va(unsigned long physaddr)
 123 {
 124 #ifdef CONFIG_AMIGA
 125         if (MACH_IS_AMIGA && (physaddr < 16*1024*1024))
 126                 return (void *)0xffffffff;
 127         else
 128 #endif
 129                 return (void *)(physaddr+PAGE_OFFSET);
 130 }
 131 #define MAP_NR(addr)            (__pa(addr) >> PAGE_SHIFT)
 132
 133 #endif /* __KERNEL__ */
 134
 135 #endif /* _M68K_PAGE_H */