include/asm-m68k/page.h

   1 #ifndef _M68K_PAGE_H
   2 #define _M68K_PAGE_H
   3
   4
   5 #ifdef __KERNEL__
   6
   7 #include <linux/const.h>
   8
   9 /* PAGE_SHIFT determines the page size */
  10 #ifndef CONFIG_SUN3
  11 #define PAGE_SHIFT      (12)
  12 #else
  13 #define PAGE_SHIFT      (13)
  14 #endif
  15 #define PAGE_SIZE       (_AC(1, UL) << PAGE_SHIFT)
  16 #define PAGE_MASK       (~(PAGE_SIZE-1))
  17
  18 #include <asm/setup.h>
  19
  20 #if PAGE_SHIFT < 13
  21 #define THREAD_SIZE (8192)
  22 #else
  23 #define THREAD_SIZE PAGE_SIZE
  24 #endif
  25
  26 #ifndef __ASSEMBLY__
  27
  28 #include <linux/compiler.h>
  29
  30 #include <asm/module.h>
  31
  32 #define get_user_page(vaddr)            __get_free_page(GFP_KERNEL)
  33 #define free_user_page(page, addr)      free_page(addr)
  34
  35 /*
  36  * We don't need to check for alignment etc.
  37  */
  38 #ifdef CPU_M68040_OR_M68060_ONLY
  39 static inline void copy_page(void *to, void *from)
  40 {
  41   unsigned long tmp;
  42
  43   __asm__ __volatile__("1:\t"
  44                        ".chip 68040\n\t"
  45                        "move16 %1@+,%0@+\n\t"
  46                        "move16 %1@+,%0@+\n\t"
  47                        ".chip 68k\n\t"
  48                        "dbra  %2,1b\n\t"
  49                        : "=a" (to), "=a" (from), "=d" (tmp)
  50                        : "0" (to), "1" (from) , "2" (PAGE_SIZE / 32 - 1)
  51                        );
  52 }
  53
  54 static inline void clear_page(void *page)
  55 {
  56         unsigned long tmp;
  57         unsigned long *sp = page;
  58
  59         *sp++ = 0;
  60         *sp++ = 0;
  61         *sp++ = 0;
  62         *sp++ = 0;
  63
  64         __asm__ __volatile__("1:\t"
  65                              ".chip 68040\n\t"
  66                              "move16 %2@+,%0@+\n\t"
  67                              ".chip 68k\n\t"
  68                              "subqw  #8,%2\n\t"
  69                              "subqw  #8,%2\n\t"
  70                              "dbra   %1,1b\n\t"
  71                              : "=a" (sp), "=d" (tmp)
  72                              : "a" (page), "0" (sp),
  73                                "1" ((PAGE_SIZE - 16) / 16 - 1));
  74 }
  75
  76 #else
  77 #define clear_page(page)        memset((page), 0, PAGE_SIZE)
  78 #define copy_page(to,from)      memcpy((to), (from), PAGE_SIZE)
  79 #endif
  80
  81 #define clear_user_page(addr, vaddr, page)      \
  82         do {    clear_page(addr);               \
  83                 flush_dcache_page(page);        \
  84         } while (0)
  85 #define copy_user_page(to, from, vaddr, page)   \
  86         do {    copy_page(to, from);            \
  87                 flush_dcache_page(page);        \
  88         } while (0)
  89
  90 /*
  91  * These are used to make use of C type-checking..
  92  */
  93 typedef struct { unsigned long pte; } pte_t;
  94 typedef struct { unsigned long pmd[16]; } pmd_t;
  95 typedef struct { unsigned long pgd; } pgd_t;
  96 typedef struct { unsigned long pgprot; } pgprot_t;
  97
  98 #define pte_val(x)      ((x).pte)
  99 #define pmd_val(x)      ((&x)->pmd[0])
 100 #define pgd_val(x)      ((x).pgd)
 101 #define pgprot_val(x)   ((x).pgprot)
 102
 103 #define __pte(x)        ((pte_t) { (x) } )
 104 #define __pmd(x)        ((pmd_t) { (x) } )
 105 #define __pgd(x)        ((pgd_t) { (x) } )
 106 #define __pgprot(x)     ((pgprot_t) { (x) } )
 107
 108 /* to align the pointer to the (next) page boundary */
 109 #define PAGE_ALIGN(addr)        (((addr)+PAGE_SIZE-1)&PAGE_MASK)
 110
 111 #endif /* !__ASSEMBLY__ */
 112
 113 #include <asm/page_offset.h>
 114
 115 #define PAGE_OFFSET             (PAGE_OFFSET_RAW)
 116
 117 #ifndef __ASSEMBLY__
 118
 119 extern unsigned long m68k_memoffset;
 120
 121 #ifndef CONFIG_SUN3
 122
 123 #define WANT_PAGE_VIRTUAL
 124
 125 static inline unsigned long ___pa(void *vaddr)
 126 {
 127         unsigned long paddr;
 128         asm (
 129                 "1:     addl #0,%0\n"
 130                 m68k_fixup(%c2, 1b+2)
 131                 : "=r" (paddr)
 132                 : "0" (vaddr), "i" (m68k_fixup_memoffset));
 133         return paddr;
 134 }
 135 #define __pa(vaddr)     ___pa((void *)(vaddr))
 136 static inline void *__va(unsigned long paddr)
 137 {
 138         void *vaddr;
 139         asm (
 140                 "1:     subl #0,%0\n"
 141                 m68k_fixup(%c2, 1b+2)
 142                 : "=r" (vaddr)
 143                 : "0" (paddr), "i" (m68k_fixup_memoffset));
 144         return vaddr;
 145 }
 146
 147 #else   /* !CONFIG_SUN3 */
 148 /* This #define is a horrible hack to suppress lots of warnings. --m */
 149 #define __pa(x) ___pa((unsigned long)(x))
 150 static inline unsigned long ___pa(unsigned long x)
 151 {
 152      if(x == 0)
 153           return 0;
 154      if(x >= PAGE_OFFSET)
 155         return (x-PAGE_OFFSET);
 156      else
 157         return (x+0x2000000);
 158 }
 159
 160 static inline void *__va(unsigned long x)
 161 {
 162      if(x == 0)
 163           return (void *)0;
 164
 165      if(x < 0x2000000)
 166         return (void *)(x+PAGE_OFFSET);
 167      else
 168         return (void *)(x-0x2000000);
 169 }
 170 #endif  /* CONFIG_SUN3 */
 171
 172 /*
 173  * NOTE: virtual isn't really correct, actually it should be the offset into the
 174  * memory node, but we have no highmem, so that works for now.
 175  * TODO: implement (fast) pfn<->pgdat_idx conversion functions, this makes lots
 176  * of the shifts unnecessary.
 177  */
 178 #define virt_to_pfn(kaddr)      (__pa(kaddr) >> PAGE_SHIFT)
 179 #define pfn_to_virt(pfn)        __va((pfn) << PAGE_SHIFT)
 180
 181 extern int m68k_virt_to_node_shift;
 182
 183 #ifdef CONFIG_SINGLE_MEMORY_CHUNK
 184 #define __virt_to_node(addr)    (&pg_data_map[0])
 185 #else
 186 extern struct pglist_data *pg_data_table[];
 187
 188 static inline __attribute_const__ int __virt_to_node_shift(void)
 189 {
 190         int shift;
 191
 192         asm (
 193                 "1:     moveq   #0,%0\n"
 194                 m68k_fixup(%c1, 1b)
 195                 : "=d" (shift)
 196                 : "i" (m68k_fixup_vnode_shift));
 197         return shift;
 198 }
 199
 200 #define __virt_to_node(addr)    (pg_data_table[(unsigned long)(addr) >> __virt_to_node_shift()])
 201 #endif
 202
 203 #define virt_to_page(addr) ({                                           \
 204         pfn_to_page(virt_to_pfn(addr));                                 \
 205 })
 206 #define page_to_virt(page) ({                                           \
 207         pfn_to_virt(page_to_pfn(page));                                 \
 208 })
 209
 210 #define pfn_to_page(pfn) ({                                             \
 211         unsigned long __pfn = (pfn);                                    \
 212         struct pglist_data *pgdat;                                      \
 213         pgdat = __virt_to_node((unsigned long)pfn_to_virt(__pfn));      \
 214         pgdat->node_mem_map + (__pfn - pgdat->node_start_pfn);          \
 215 })
 216 #define page_to_pfn(_page) ({                                           \
 217         struct page *__p = (_page);                                     \
 218         struct pglist_data *pgdat;                                      \
 219         pgdat = &pg_data_map[page_to_nid(__p)];                         \
 220         ((__p) - pgdat->node_mem_map) + pgdat->node_start_pfn;          \
 221 })
 222
 223 #define virt_addr_valid(kaddr)  ((void *)(kaddr) >= (void *)PAGE_OFFSET && (void *)(kaddr) < high_memory)
 224 #define pfn_valid(pfn)          virt_addr_valid(pfn_to_virt(pfn))
 225
 226 #endif /* __ASSEMBLY__ */
 227
 228 #define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | VM_EXEC | \
 229                                  VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 230
 231 #include <asm-generic/page.h>
 232
 233 #endif /* __KERNEL__ */
 234
 235 #endif /* _M68K_PAGE_H */