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 #include <linux/compiler.h>
  31
  32 #include <asm/module.h>
  33
  34 #define get_user_page(vaddr)            __get_free_page(GFP_KERNEL)
  35 #define free_user_page(page, addr)      free_page(addr)
  36
  37 /*
  38  * We don't need to check for alignment etc.
  39  */
  40 #ifdef CPU_M68040_OR_M68060_ONLY
  41 static inline void copy_page(void *to, void *from)
  42 {
  43   unsigned long tmp;
  44
  45   __asm__ __volatile__("1:\t"
  46                        ".chip 68040\n\t"
  47                        "move16 %1@+,%0@+\n\t"
  48                        "move16 %1@+,%0@+\n\t"
  49                        ".chip 68k\n\t"
  50                        "dbra  %2,1b\n\t"
  51                        : "=a" (to), "=a" (from), "=d" (tmp)
  52                        : "0" (to), "1" (from) , "2" (PAGE_SIZE / 32 - 1)
  53                        );
  54 }
  55
  56 static inline void clear_page(void *page)
  57 {
  58         unsigned long tmp;
  59         unsigned long *sp = page;
  60
  61         *sp++ = 0;
  62         *sp++ = 0;
  63         *sp++ = 0;
  64         *sp++ = 0;
  65
  66         __asm__ __volatile__("1:\t"
  67                              ".chip 68040\n\t"
  68                              "move16 %2@+,%0@+\n\t"
  69                              ".chip 68k\n\t"
  70                              "subqw  #8,%2\n\t"
  71                              "subqw  #8,%2\n\t"
  72                              "dbra   %1,1b\n\t"
  73                              : "=a" (sp), "=d" (tmp)
  74                              : "a" (page), "0" (sp),
  75                                "1" ((PAGE_SIZE - 16) / 16 - 1));
  76 }
  77
  78 #else
  79 #define clear_page(page)        memset((page), 0, PAGE_SIZE)
  80 #define copy_page(to,from)      memcpy((to), (from), PAGE_SIZE)
  81 #endif
  82
  83 #define clear_user_page(addr, vaddr, page)      \
  84         do {    clear_page(addr);               \
  85                 flush_dcache_page(page);        \
  86         } while (0)
  87 #define copy_user_page(to, from, vaddr, page)   \
  88         do {    copy_page(to, from);            \
  89                 flush_dcache_page(page);        \
  90         } while (0)
  91
  92 /*
  93  * These are used to make use of C type-checking..
  94  */
  95 typedef struct { unsigned long pte; } pte_t;
  96 typedef struct { unsigned long pmd[16]; } pmd_t;
  97 typedef struct { unsigned long pgd; } pgd_t;
  98 typedef struct { unsigned long pgprot; } pgprot_t;
  99
 100 #define pte_val(x)      ((x).pte)
 101 #define pmd_val(x)      ((&x)->pmd[0])
 102 #define pgd_val(x)      ((x).pgd)
 103 #define pgprot_val(x)   ((x).pgprot)
 104
 105 #define __pte(x)        ((pte_t) { (x) } )
 106 #define __pmd(x)        ((pmd_t) { (x) } )
 107 #define __pgd(x)        ((pgd_t) { (x) } )
 108 #define __pgprot(x)     ((pgprot_t) { (x) } )
 109
 110 /* to align the pointer to the (next) page boundary */
 111 #define PAGE_ALIGN(addr)        (((addr)+PAGE_SIZE-1)&PAGE_MASK)
 112
 113 #endif /* !__ASSEMBLY__ */
 114
 115 #include <asm/page_offset.h>
 116
 117 #define PAGE_OFFSET             (PAGE_OFFSET_RAW)
 118
 119 #ifndef __ASSEMBLY__
 120
 121 extern unsigned long m68k_memoffset;
 122
 123 #ifndef CONFIG_SUN3
 124
 125 #define WANT_PAGE_VIRTUAL
 126
 127 static inline unsigned long ___pa(void *vaddr)
 128 {
 129         unsigned long paddr;
 130         asm (
 131                 "1:     addl #0,%0\n"
 132                 m68k_fixup(%c2, 1b+2)
 133                 : "=r" (paddr)
 134                 : "0" (vaddr), "i" (m68k_fixup_memoffset));
 135         return paddr;
 136 }
 137 #define __pa(vaddr)     ___pa((void *)(vaddr))
 138 static inline void *__va(unsigned long paddr)
 139 {
 140         void *vaddr;
 141         asm (
 142                 "1:     subl #0,%0\n"
 143                 m68k_fixup(%c2, 1b+2)
 144                 : "=r" (vaddr)
 145                 : "0" (paddr), "i" (m68k_fixup_memoffset));
 146         return vaddr;
 147 }
 148
 149 #else   /* !CONFIG_SUN3 */
 150 /* This #define is a horrible hack to suppress lots of warnings. --m */
 151 #define __pa(x) ___pa((unsigned long)(x))
 152 static inline unsigned long ___pa(unsigned long x)
 153 {
 154      if(x == 0)
 155           return 0;
 156      if(x >= PAGE_OFFSET)
 157         return (x-PAGE_OFFSET);
 158      else
 159         return (x+0x2000000);
 160 }
 161
 162 static inline void *__va(unsigned long x)
 163 {
 164      if(x == 0)
 165           return (void *)0;
 166
 167      if(x < 0x2000000)
 168         return (void *)(x+PAGE_OFFSET);
 169      else
 170         return (void *)(x-0x2000000);
 171 }
 172 #endif  /* CONFIG_SUN3 */
 173
 174 /*
 175  * NOTE: virtual isn't really correct, actually it should be the offset into the
 176  * memory node, but we have no highmem, so that works for now.
 177  * TODO: implement (fast) pfn<->pgdat_idx conversion functions, this makes lots
 178  * of the shifts unnecessary.
 179  */
 180 #define virt_to_pfn(kaddr)      (__pa(kaddr) >> PAGE_SHIFT)
 181 #define pfn_to_virt(pfn)        __va((pfn) << PAGE_SHIFT)
 182
 183 extern int m68k_virt_to_node_shift;
 184
 185 #ifdef CONFIG_SINGLE_MEMORY_CHUNK
 186 #define __virt_to_node(addr)    (&pg_data_map[0])
 187 #else
 188 extern struct pglist_data *pg_data_table[];
 189
 190 static inline __attribute_const__ int __virt_to_node_shift(void)
 191 {
 192         int shift;
 193
 194         asm (
 195                 "1:     moveq   #0,%0\n"
 196                 m68k_fixup(%c1, 1b)
 197                 : "=d" (shift)
 198                 : "i" (m68k_fixup_vnode_shift));
 199         return shift;
 200 }
 201
 202 #define __virt_to_node(addr)    (pg_data_table[(unsigned long)(addr) >> __virt_to_node_shift()])
 203 #endif
 204
 205 #define virt_to_page(addr) ({                                           \
 206         pfn_to_page(virt_to_pfn(addr));                                 \
 207 })
 208 #define page_to_virt(page) ({                                           \
 209         pfn_to_virt(page_to_pfn(page));                                 \
 210 })
 211
 212 #define pfn_to_page(pfn) ({                                             \
 213         unsigned long __pfn = (pfn);                                    \
 214         struct pglist_data *pgdat;                                      \
 215         pgdat = __virt_to_node((unsigned long)pfn_to_virt(__pfn));      \
 216         pgdat->node_mem_map + (__pfn - pgdat->node_start_pfn);          \
 217 })
 218 #define page_to_pfn(_page) ({                                           \
 219         struct page *__p = (_page);                                     \
 220         struct pglist_data *pgdat;                                      \
 221         pgdat = &pg_data_map[page_to_nid(__p)];                         \
 222         ((__p) - pgdat->node_mem_map) + pgdat->node_start_pfn;          \
 223 })
 224
 225 #define virt_addr_valid(kaddr)  ((void *)(kaddr) >= (void *)PAGE_OFFSET && (void *)(kaddr) < high_memory)
 226 #define pfn_valid(pfn)          virt_addr_valid(pfn_to_virt(pfn))
 227
 228 #endif /* __ASSEMBLY__ */
 229
 230 #define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | VM_EXEC | \
 231                                  VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 232
 233 #include <asm-generic/page.h>
 234
 235 #endif /* __KERNEL__ */
 236
 237 #endif /* _M68K_PAGE_H */