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 #ifndef CONFIG_SUN3
   8 #define PAGE_SHIFT      (12)
   9 #define PAGE_SIZE       (4096)
  10 #else
  11 #define PAGE_SHIFT      (13)
  12 #define PAGE_SIZE       (8192)
  13 #endif
  14 #define PAGE_MASK       (~(PAGE_SIZE-1))
  15
  16 #ifdef __KERNEL__
  17
  18 #include <asm/setup.h>
  19
  20 #if PAGE_SHIFT < 13
  21 #define KTHREAD_SIZE (8192)
  22 #else
  23 #define KTHREAD_SIZE PAGE_SIZE
  24 #endif
  25
  26 #ifndef __ASSEMBLY__
  27
  28 #define get_user_page(vaddr)            __get_free_page(GFP_KERNEL)
  29 #define free_user_page(page, addr)      free_page(addr)
  30
  31 /*
  32  * We don't need to check for alignment etc.
  33  */
  34 #ifdef CPU_M68040_OR_M68060_ONLY
  35 static inline void copy_page(void *to, void *from)
  36 {
  37   unsigned long tmp;
  38
  39   __asm__ __volatile__("1:\t"
  40                        ".chip 68040\n\t"
  41                        "move16 %1@+,%0@+\n\t"
  42                        "move16 %1@+,%0@+\n\t"
  43                        ".chip 68k\n\t"
  44                        "dbra  %2,1b\n\t"
  45                        : "=a" (to), "=a" (from), "=d" (tmp)
  46                        : "0" (to), "1" (from) , "2" (PAGE_SIZE / 32 - 1)
  47                        );
  48 }
  49
  50 static inline void clear_page(void *page)
  51 {
  52         unsigned long data, tmp;
  53         void *sp = page;
  54
  55         data = 0;
  56
  57         *((unsigned long *)(page))++ = 0;
  58         *((unsigned long *)(page))++ = 0;
  59         *((unsigned long *)(page))++ = 0;
  60         *((unsigned long *)(page))++ = 0;
  61
  62         __asm__ __volatile__("1:\t"
  63                              ".chip 68040\n\t"
  64                              "move16 %2@+,%0@+\n\t"
  65                              ".chip 68k\n\t"
  66                              "subqw  #8,%2\n\t"
  67                              "subqw  #8,%2\n\t"
  68                              "dbra   %1,1b\n\t"
  69                              : "=a" (page), "=d" (tmp)
  70                              : "a" (sp), "0" (page),
  71                                "1" ((PAGE_SIZE - 16) / 16 - 1));
  72 }
  73
  74 #else
  75 #define clear_page(page)        memset((page), 0, PAGE_SIZE)
  76 #define copy_page(to,from)      memcpy((to), (from), PAGE_SIZE)
  77 #endif
  78
  79 #define clear_user_page(page, vaddr)    clear_page(page)
  80 #define copy_user_page(to, from, vaddr) copy_page(to, from)
  81
  82 /*
  83  * These are used to make use of C type-checking..
  84  */
  85 typedef struct { unsigned long pte; } pte_t;
  86 typedef struct { unsigned long pmd[16]; } pmd_t;
  87 typedef struct { unsigned long pgd; } pgd_t;
  88 typedef struct { unsigned long pgprot; } pgprot_t;
  89
  90 #define pte_val(x)      ((x).pte)
  91 #define pmd_val(x)      ((&x)->pmd[0])
  92 #define pgd_val(x)      ((x).pgd)
  93 #define pgprot_val(x)   ((x).pgprot)
  94
  95 #define __pte(x)        ((pte_t) { (x) } )
  96 #define __pmd(x)        ((pmd_t) { (x) } )
  97 #define __pgd(x)        ((pgd_t) { (x) } )
  98 #define __pgprot(x)     ((pgprot_t) { (x) } )
  99
 100 /* to align the pointer to the (next) page boundary */
 101 #define PAGE_ALIGN(addr)        (((addr)+PAGE_SIZE-1)&PAGE_MASK)
 102
 103 /* Pure 2^n version of get_order */
 104 extern __inline__ int get_order(unsigned long size)
 105 {
 106         int order;
 107
 108         size = (size-1) >> (PAGE_SHIFT-1);
 109         order = -1;
 110         do {
 111                 size >>= 1;
 112                 order++;
 113         } while (size);
 114         return order;
 115 }
 116
 117 #endif /* !__ASSEMBLY__ */
 118
 119 #include <asm/page_offset.h>
 120
 121 #define PAGE_OFFSET             (PAGE_OFFSET_RAW)
 122
 123 #ifndef __ASSEMBLY__
 124
 125 #ifndef CONFIG_SUN3
 126
 127 #ifdef CONFIG_SINGLE_MEMORY_CHUNK
 128 extern unsigned long m68k_memoffset;
 129
 130 #define __pa(vaddr)             ((unsigned long)(vaddr)+m68k_memoffset)
 131 #define __va(paddr)             ((void *)((unsigned long)(paddr)-m68k_memoffset))
 132 #else
 133 #define __pa(vaddr)             virt_to_phys((void *)vaddr)
 134 #define __va(paddr)             phys_to_virt((unsigned long)paddr)
 135 #endif
 136
 137 #else   /* !CONFIG_SUN3 */
 138 /* This #define is a horrible hack to suppress lots of warnings. --m */
 139 #define __pa(x) ___pa((unsigned long)x)
 140 static inline unsigned long ___pa(unsigned long x)
 141 {
 142      if(x == 0)
 143           return 0;
 144      if(x > PAGE_OFFSET)
 145         return (x-PAGE_OFFSET);
 146      else
 147         return (x+0x2000000);
 148 }
 149
 150 static inline void *__va(unsigned long x)
 151 {
 152      if(x == 0)
 153           return (void *)0;
 154
 155      if(x < 0x2000000)
 156         return (void *)(x+PAGE_OFFSET);
 157      else
 158         return (void *)(x-0x2000000);
 159 }
 160 #endif  /* CONFIG_SUN3 */
 161
 162 #define MAP_NR(addr)            (((unsigned long)(addr)-PAGE_OFFSET) >> PAGE_SHIFT)
 163
 164 #ifndef CONFIG_SUN3
 165 #define BUG() do { \
 166         printk("kernel BUG at %s:%d!\n", __FILE__, __LINE__); \
 167         asm volatile("illegal"); \
 168 } while (0)
 169 #else
 170 #define BUG() do { \
 171         printk("kernel BUG at %s:%d!\n", __FILE__, __LINE__); \
 172         panic("BUG!"); \
 173 } while (0)
 174 #endif
 175
 176 #define PAGE_BUG(page) do { \
 177         BUG(); \
 178 } while (0)
 179
 180 #endif /* __ASSEMBLY__ */
 181
 182 #endif /* __KERNEL__ */
 183
 184 #endif /* _M68K_PAGE_H */