include/asm-m68k/page.h

   1 #ifndef _M68K_PAGE_H
   2 #define _M68K_PAGE_H
   3
   4
   5 #ifdef __KERNEL__
   6
   7 /* PAGE_SHIFT determines the page size */
   8 #ifndef CONFIG_SUN3
   9 #define PAGE_SHIFT      (12)
  10 #else
  11 #define PAGE_SHIFT      (13)
  12 #endif
  13 #ifdef __ASSEMBLY__
  14 #define PAGE_SIZE       (1 << PAGE_SHIFT)
  15 #else
  16 #define PAGE_SIZE       (1UL << PAGE_SHIFT)
  17 #endif
  18 #define PAGE_MASK       (~(PAGE_SIZE-1))
  19
  20 #include <asm/setup.h>
  21
  22 #if PAGE_SHIFT < 13
  23 #define THREAD_SIZE (8192)
  24 #else
  25 #define THREAD_SIZE PAGE_SIZE
  26 #endif
  27
  28 #ifndef __ASSEMBLY__
  29
  30 #define get_user_page(vaddr)            __get_free_page(GFP_KERNEL)
  31 #define free_user_page(page, addr)      free_page(addr)
  32
  33 /*
  34  * We don't need to check for alignment etc.
  35  */
  36 #ifdef CPU_M68040_OR_M68060_ONLY
  37 static inline void copy_page(void *to, void *from)
  38 {
  39   unsigned long tmp;
  40
  41   __asm__ __volatile__("1:\t"
  42                        ".chip 68040\n\t"
  43                        "move16 %1@+,%0@+\n\t"
  44                        "move16 %1@+,%0@+\n\t"
  45                        ".chip 68k\n\t"
  46                        "dbra  %2,1b\n\t"
  47                        : "=a" (to), "=a" (from), "=d" (tmp)
  48                        : "0" (to), "1" (from) , "2" (PAGE_SIZE / 32 - 1)
  49                        );
  50 }
  51
  52 static inline void clear_page(void *page)
  53 {
  54         unsigned long tmp;
  55         unsigned long *sp = page;
  56
  57         *sp++ = 0;
  58         *sp++ = 0;
  59         *sp++ = 0;
  60         *sp++ = 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" (sp), "=d" (tmp)
  70                              : "a" (page), "0" (sp),
  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(addr, vaddr, page)      \
  80         do {    clear_page(addr);               \
  81                 flush_dcache_page(page);        \
  82         } while (0)
  83 #define copy_user_page(to, from, vaddr, page)   \
  84         do {    copy_page(to, from);            \
  85                 flush_dcache_page(page);        \
  86         } while (0)
  87
  88 /*
  89  * These are used to make use of C type-checking..
  90  */
  91 typedef struct { unsigned long pte; } pte_t;
  92 typedef struct { unsigned long pmd[16]; } pmd_t;
  93 typedef struct { unsigned long pgd; } pgd_t;
  94 typedef struct { unsigned long pgprot; } pgprot_t;
  95
  96 #define pte_val(x)      ((x).pte)
  97 #define pmd_val(x)      ((&x)->pmd[0])
  98 #define pgd_val(x)      ((x).pgd)
  99 #define pgprot_val(x)   ((x).pgprot)
 100
 101 #define __pte(x)        ((pte_t) { (x) } )
 102 #define __pmd(x)        ((pmd_t) { (x) } )
 103 #define __pgd(x)        ((pgd_t) { (x) } )
 104 #define __pgprot(x)     ((pgprot_t) { (x) } )
 105
 106 /* to align the pointer to the (next) page boundary */
 107 #define PAGE_ALIGN(addr)        (((addr)+PAGE_SIZE-1)&PAGE_MASK)
 108
 109 #endif /* !__ASSEMBLY__ */
 110
 111 #include <asm/page_offset.h>
 112
 113 #define PAGE_OFFSET             (PAGE_OFFSET_RAW)
 114
 115 #ifndef __ASSEMBLY__
 116
 117 #ifndef CONFIG_SUN3
 118
 119 #define WANT_PAGE_VIRTUAL
 120 #ifdef CONFIG_SINGLE_MEMORY_CHUNK
 121 extern unsigned long m68k_memoffset;
 122
 123 #define __pa(vaddr)             ((unsigned long)(vaddr)+m68k_memoffset)
 124 #define __va(paddr)             ((void *)((unsigned long)(paddr)-m68k_memoffset))
 125 #else
 126 #define __pa(vaddr)             virt_to_phys((void *)(vaddr))
 127 #define __va(paddr)             phys_to_virt((unsigned long)(paddr))
 128 #endif
 129
 130 #else   /* !CONFIG_SUN3 */
 131 /* This #define is a horrible hack to suppress lots of warnings. --m */
 132 #define __pa(x) ___pa((unsigned long)(x))
 133 static inline unsigned long ___pa(unsigned long x)
 134 {
 135      if(x == 0)
 136           return 0;
 137      if(x >= PAGE_OFFSET)
 138         return (x-PAGE_OFFSET);
 139      else
 140         return (x+0x2000000);
 141 }
 142
 143 static inline void *__va(unsigned long x)
 144 {
 145      if(x == 0)
 146           return (void *)0;
 147
 148      if(x < 0x2000000)
 149         return (void *)(x+PAGE_OFFSET);
 150      else
 151         return (void *)(x-0x2000000);
 152 }
 153 #endif  /* CONFIG_SUN3 */
 154
 155 /*
 156  * NOTE: virtual isn't really correct, actually it should be the offset into the
 157  * memory node, but we have no highmem, so that works for now.
 158  * TODO: implement (fast) pfn<->pgdat_idx conversion functions, this makes lots
 159  * of the shifts unnecessary.
 160  */
 161 #define virt_to_pfn(kaddr)      (__pa(kaddr) >> PAGE_SHIFT)
 162 #define pfn_to_virt(pfn)        __va((pfn) << PAGE_SHIFT)
 163
 164 #define virt_to_page(kaddr)     (mem_map + (((unsigned long)(kaddr)-PAGE_OFFSET) >> PAGE_SHIFT))
 165 #define page_to_virt(page)      ((((page) - mem_map) << PAGE_SHIFT) + PAGE_OFFSET)
 166
 167 #define pfn_to_page(pfn)        virt_to_page(pfn_to_virt(pfn))
 168 #define page_to_pfn(page)       virt_to_pfn(page_to_virt(page))
 169
 170 #define virt_addr_valid(kaddr)  ((void *)(kaddr) >= (void *)PAGE_OFFSET && (void *)(kaddr) < high_memory)
 171 #define pfn_valid(pfn)          virt_addr_valid(pfn_to_virt(pfn))
 172
 173 #endif /* __ASSEMBLY__ */
 174
 175 #define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | VM_EXEC | \
 176                                  VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 177
 178 #include <asm-generic/page.h>
 179
 180 #endif /* __KERNEL__ */
 181
 182 #endif /* _M68K_PAGE_H */