arch/m68k/include/asm/page_mm.h

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