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 #else
  10 #define PAGE_SHIFT      (13)
  11 #endif
  12 #ifdef __ASSEMBLY__
  13 #define PAGE_SIZE       (1 << PAGE_SHIFT)
  14 #else
  15 #define PAGE_SIZE       (1UL << PAGE_SHIFT)
  16 #endif
  17 #define PAGE_MASK       (~(PAGE_SIZE-1))
  18
  19 #ifdef __KERNEL__
  20
  21 #include <asm/setup.h>
  22
  23 #if PAGE_SHIFT < 13
  24 #define THREAD_SIZE (8192)
  25 #else
  26 #define THREAD_SIZE PAGE_SIZE
  27 #endif
  28
  29 #ifndef __ASSEMBLY__
  30
  31 #define get_user_page(vaddr)            __get_free_page(GFP_KERNEL)
  32 #define free_user_page(page, addr)      free_page(addr)
  33
  34 /*
  35  * We don't need to check for alignment etc.
  36  */
  37 #ifdef CPU_M68040_OR_M68060_ONLY
  38 static inline void copy_page(void *to, void *from)
  39 {
  40   unsigned long tmp;
  41
  42   __asm__ __volatile__("1:\t"
  43                        ".chip 68040\n\t"
  44                        "move16 %1@+,%0@+\n\t"
  45                        "move16 %1@+,%0@+\n\t"
  46                        ".chip 68k\n\t"
  47                        "dbra  %2,1b\n\t"
  48                        : "=a" (to), "=a" (from), "=d" (tmp)
  49                        : "0" (to), "1" (from) , "2" (PAGE_SIZE / 32 - 1)
  50                        );
  51 }
  52
  53 static inline void clear_page(void *page)
  54 {
  55         unsigned long tmp;
  56         unsigned long *sp = page;
  57
  58         *sp++ = 0;
  59         *sp++ = 0;
  60         *sp++ = 0;
  61         *sp++ = 0;
  62
  63         __asm__ __volatile__("1:\t"
  64                              ".chip 68040\n\t"
  65                              "move16 %2@+,%0@+\n\t"
  66                              ".chip 68k\n\t"
  67                              "subqw  #8,%2\n\t"
  68                              "subqw  #8,%2\n\t"
  69                              "dbra   %1,1b\n\t"
  70                              : "=a" (sp), "=d" (tmp)
  71                              : "a" (page), "0" (sp),
  72                                "1" ((PAGE_SIZE - 16) / 16 - 1));
  73 }
  74
  75 #else
  76 #define clear_page(page)        memset((page), 0, PAGE_SIZE)
  77 #define copy_page(to,from)      memcpy((to), (from), PAGE_SIZE)
  78 #endif
  79
  80 #define clear_user_page(addr, vaddr, page)      \
  81         do {    clear_page(addr);               \
  82                 flush_dcache_page(page);        \
  83         } while (0)
  84 #define copy_user_page(to, from, vaddr, page)   \
  85         do {    copy_page(to, from);            \
  86                 flush_dcache_page(page);        \
  87         } while (0)
  88
  89 /*
  90  * These are used to make use of C type-checking..
  91  */
  92 typedef struct { unsigned long pte; } pte_t;
  93 typedef struct { unsigned long pmd[16]; } pmd_t;
  94 typedef struct { unsigned long pgd; } pgd_t;
  95 typedef struct { unsigned long pgprot; } pgprot_t;
  96
  97 #define pte_val(x)      ((x).pte)
  98 #define pmd_val(x)      ((&x)->pmd[0])
  99 #define pgd_val(x)      ((x).pgd)
 100 #define pgprot_val(x)   ((x).pgprot)
 101
 102 #define __pte(x)        ((pte_t) { (x) } )
 103 #define __pmd(x)        ((pmd_t) { (x) } )
 104 #define __pgd(x)        ((pgd_t) { (x) } )
 105 #define __pgprot(x)     ((pgprot_t) { (x) } )
 106
 107 /* to align the pointer to the (next) page boundary */
 108 #define PAGE_ALIGN(addr)        (((addr)+PAGE_SIZE-1)&PAGE_MASK)
 109
 110 /* Pure 2^n version of get_order */
 111 static inline int get_order(unsigned long size)
 112 {
 113         int order;
 114
 115         size = (size-1) >> (PAGE_SHIFT-1);
 116         order = -1;
 117         do {
 118                 size >>= 1;
 119                 order++;
 120         } while (size);
 121         return order;
 122 }
 123
 124 #endif /* !__ASSEMBLY__ */
 125
 126 #include <asm/page_offset.h>
 127
 128 #define PAGE_OFFSET             (PAGE_OFFSET_RAW)
 129
 130 #ifndef __ASSEMBLY__
 131
 132 #ifndef CONFIG_SUN3
 133
 134 #define WANT_PAGE_VIRTUAL
 135 #ifdef CONFIG_SINGLE_MEMORY_CHUNK
 136 extern unsigned long m68k_memoffset;
 137
 138 #define __pa(vaddr)             ((unsigned long)(vaddr)+m68k_memoffset)
 139 #define __va(paddr)             ((void *)((unsigned long)(paddr)-m68k_memoffset))
 140 #else
 141 #define __pa(vaddr)             virt_to_phys((void *)vaddr)
 142 #define __va(paddr)             phys_to_virt((unsigned long)paddr)
 143 #endif
 144
 145 #else   /* !CONFIG_SUN3 */
 146 /* This #define is a horrible hack to suppress lots of warnings. --m */
 147 #define __pa(x) ___pa((unsigned long)x)
 148 static inline unsigned long ___pa(unsigned long x)
 149 {
 150      if(x == 0)
 151           return 0;
 152      if(x >= PAGE_OFFSET)
 153         return (x-PAGE_OFFSET);
 154      else
 155         return (x+0x2000000);
 156 }
 157
 158 static inline void *__va(unsigned long x)
 159 {
 160      if(x == 0)
 161           return (void *)0;
 162
 163      if(x < 0x2000000)
 164         return (void *)(x+PAGE_OFFSET);
 165      else
 166         return (void *)(x-0x2000000);
 167 }
 168 #endif  /* CONFIG_SUN3 */
 169
 170 /*
 171  * NOTE: virtual isn't really correct, actually it should be the offset into the
 172  * memory node, but we have no highmem, so that works for now.
 173  * TODO: implement (fast) pfn<->pgdat_idx conversion functions, this makes lots
 174  * of the shifts unnecessary.
 175  */
 176 #define virt_to_pfn(kaddr)      (__pa(kaddr) >> PAGE_SHIFT)
 177 #define pfn_to_virt(pfn)        __va((pfn) << PAGE_SHIFT)
 178
 179 #define virt_to_page(kaddr)     (mem_map + (((unsigned long)(kaddr)-PAGE_OFFSET) >> PAGE_SHIFT))
 180 #define page_to_virt(page)      ((((page) - mem_map) << PAGE_SHIFT) + PAGE_OFFSET)
 181
 182 #define pfn_to_page(pfn)        virt_to_page(pfn_to_virt(pfn))
 183 #define page_to_pfn(page)       virt_to_pfn(page_to_virt(page))
 184
 185 #define virt_addr_valid(kaddr)  ((void *)(kaddr) >= (void *)PAGE_OFFSET && (void *)(kaddr) < high_memory)
 186 #define pfn_valid(pfn)          virt_addr_valid(pfn_to_virt(pfn))
 187
 188 #endif /* __ASSEMBLY__ */
 189
 190 #define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | VM_EXEC | \
 191                                  VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 192
 193 #endif /* __KERNEL__ */
 194
 195 #endif /* _M68K_PAGE_H */