arch/m68k/include/asm/page_mm.h

   1 #ifndef _M68K_PAGE_MM_H
   2 #define _M68K_PAGE_MM_H
   3
   4 #ifndef __ASSEMBLY__
   5
   6 #include <linux/compiler.h>
   7 #include <asm/module.h>
   8
   9 #define get_user_page(vaddr)            __get_free_page(GFP_KERNEL)
  10 #define free_user_page(page, addr)      free_page(addr)
  11
  12 /*
  13  * We don't need to check for alignment etc.
  14  */
  15 #ifdef CPU_M68040_OR_M68060_ONLY
  16 static inline void copy_page(void *to, void *from)
  17 {
  18   unsigned long tmp;
  19
  20   __asm__ __volatile__("1:\t"
  21                        ".chip 68040\n\t"
  22                        "move16 %1@+,%0@+\n\t"
  23                        "move16 %1@+,%0@+\n\t"
  24                        ".chip 68k\n\t"
  25                        "dbra  %2,1b\n\t"
  26                        : "=a" (to), "=a" (from), "=d" (tmp)
  27                        : "0" (to), "1" (from) , "2" (PAGE_SIZE / 32 - 1)
  28                        );
  29 }
  30
  31 static inline void clear_page(void *page)
  32 {
  33         unsigned long tmp;
  34         unsigned long *sp = page;
  35
  36         *sp++ = 0;
  37         *sp++ = 0;
  38         *sp++ = 0;
  39         *sp++ = 0;
  40
  41         __asm__ __volatile__("1:\t"
  42                              ".chip 68040\n\t"
  43                              "move16 %2@+,%0@+\n\t"
  44                              ".chip 68k\n\t"
  45                              "subqw  #8,%2\n\t"
  46                              "subqw  #8,%2\n\t"
  47                              "dbra   %1,1b\n\t"
  48                              : "=a" (sp), "=d" (tmp)
  49                              : "a" (page), "0" (sp),
  50                                "1" ((PAGE_SIZE - 16) / 16 - 1));
  51 }
  52
  53 #else
  54 #define clear_page(page)        memset((page), 0, PAGE_SIZE)
  55 #define copy_page(to,from)      memcpy((to), (from), PAGE_SIZE)
  56 #endif
  57
  58 #define clear_user_page(addr, vaddr, page)      \
  59         do {    clear_page(addr);               \
  60                 flush_dcache_page(page);        \
  61         } while (0)
  62 #define copy_user_page(to, from, vaddr, page)   \
  63         do {    copy_page(to, from);            \
  64                 flush_dcache_page(page);        \
  65         } while (0)
  66
  67 extern unsigned long m68k_memoffset;
  68
  69 #ifndef CONFIG_SUN3
  70
  71 #define WANT_PAGE_VIRTUAL
  72
  73 static inline unsigned long ___pa(void *vaddr)
  74 {
  75         unsigned long paddr;
  76         asm (
  77                 "1:     addl #0,%0\n"
  78                 m68k_fixup(%c2, 1b+2)
  79                 : "=r" (paddr)
  80                 : "0" (vaddr), "i" (m68k_fixup_memoffset));
  81         return paddr;
  82 }
  83 #define __pa(vaddr)     ___pa((void *)(long)(vaddr))
  84 static inline void *__va(unsigned long paddr)
  85 {
  86         void *vaddr;
  87         asm (
  88                 "1:     subl #0,%0\n"
  89                 m68k_fixup(%c2, 1b+2)
  90                 : "=r" (vaddr)
  91                 : "0" (paddr), "i" (m68k_fixup_memoffset));
  92         return vaddr;
  93 }
  94
  95 #else   /* !CONFIG_SUN3 */
  96 /* This #define is a horrible hack to suppress lots of warnings. --m */
  97 #define __pa(x) ___pa((unsigned long)(x))
  98 static inline unsigned long ___pa(unsigned long x)
  99 {
 100      if(x == 0)
 101           return 0;
 102      if(x >= PAGE_OFFSET)
 103         return (x-PAGE_OFFSET);
 104      else
 105         return (x+0x2000000);
 106 }
 107
 108 static inline void *__va(unsigned long x)
 109 {
 110      if(x == 0)
 111           return (void *)0;
 112
 113      if(x < 0x2000000)
 114         return (void *)(x+PAGE_OFFSET);
 115      else
 116         return (void *)(x-0x2000000);
 117 }
 118 #endif  /* CONFIG_SUN3 */
 119
 120 /*
 121  * NOTE: virtual isn't really correct, actually it should be the offset into the
 122  * memory node, but we have no highmem, so that works for now.
 123  * TODO: implement (fast) pfn<->pgdat_idx conversion functions, this makes lots
 124  * of the shifts unnecessary.
 125  */
 126 #define virt_to_pfn(kaddr)      (__pa(kaddr) >> PAGE_SHIFT)
 127 #define pfn_to_virt(pfn)        __va((pfn) << PAGE_SHIFT)
 128
 129 extern int m68k_virt_to_node_shift;
 130
 131 #ifdef CONFIG_SINGLE_MEMORY_CHUNK
 132 #define __virt_to_node(addr)    (&pg_data_map[0])
 133 #else
 134 extern struct pglist_data *pg_data_table[];
 135
 136 static inline __attribute_const__ int __virt_to_node_shift(void)
 137 {
 138         int shift;
 139
 140         asm (
 141                 "1:     moveq   #0,%0\n"
 142                 m68k_fixup(%c1, 1b)
 143                 : "=d" (shift)
 144                 : "i" (m68k_fixup_vnode_shift));
 145         return shift;
 146 }
 147
 148 #define __virt_to_node(addr)    (pg_data_table[(unsigned long)(addr) >> __virt_to_node_shift()])
 149 #endif
 150
 151 #define virt_to_page(addr) ({                                           \
 152         pfn_to_page(virt_to_pfn(addr));                                 \
 153 })
 154 #define page_to_virt(page) ({                                           \
 155         pfn_to_virt(page_to_pfn(page));                                 \
 156 })
 157
 158 #define pfn_to_page(pfn) ({                                             \
 159         unsigned long __pfn = (pfn);                                    \
 160         struct pglist_data *pgdat;                                      \
 161         pgdat = __virt_to_node((unsigned long)pfn_to_virt(__pfn));      \
 162         pgdat->node_mem_map + (__pfn - pgdat->node_start_pfn);          \
 163 })
 164 #define page_to_pfn(_page) ({                                           \
 165         struct page *__p = (_page);                                     \
 166         struct pglist_data *pgdat;                                      \
 167         pgdat = &pg_data_map[page_to_nid(__p)];                         \
 168         ((__p) - pgdat->node_mem_map) + pgdat->node_start_pfn;          \
 169 })
 170
 171 #define virt_addr_valid(kaddr)  ((void *)(kaddr) >= (void *)PAGE_OFFSET && (void *)(kaddr) < high_memory)
 172 #define pfn_valid(pfn)          virt_addr_valid(pfn_to_virt(pfn))
 173
 174 #endif /* __ASSEMBLY__ */
 175
 176 #define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | VM_EXEC | \
 177                                  VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 178
 179 #endif /* _M68K_PAGE_MM_H */