include/asm-m68k/page.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 /* 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 extern unsigned long m68k_memoffset;
 118
 119 #ifndef CONFIG_SUN3
 120
 121 #define WANT_PAGE_VIRTUAL
 122
 123 static inline unsigned long ___pa(void *vaddr)
 124 {
 125         unsigned long paddr;
 126         asm (
 127                 "1:     addl #0,%0\n"
 128                 m68k_fixup(%c2, 1b+2)
 129                 : "=r" (paddr)
 130                 : "0" (vaddr), "i" (m68k_fixup_memoffset));
 131         return paddr;
 132 }
 133 #define __pa(vaddr)     ___pa((void *)(vaddr))
 134 static inline void *__va(unsigned long paddr)
 135 {
 136         void *vaddr;
 137         asm (
 138                 "1:     subl #0,%0\n"
 139                 m68k_fixup(%c2, 1b+2)
 140                 : "=r" (vaddr)
 141                 : "0" (paddr), "i" (m68k_fixup_memoffset));
 142         return vaddr;
 143 }
 144
 145 #else   /* !CONFIG_SUN3 */
 146 /* This #define is a horrible hack to suppress lots of warnings. --m */
 147 #define __pa(x) ___pa((unsigned long)(x))
 148 static inline unsigned long ___pa(unsigned long x)
 149 {
 150      if(x == 0)
 151           return 0;
 152      if(x >= PAGE_OFFSET)
 153         return (x-PAGE_OFFSET);
 154      else
 155         return (x+0x2000000);
 156 }
 157
 158 static inline void *__va(unsigned long x)
 159 {
 160      if(x == 0)
 161           return (void *)0;
 162
 163      if(x < 0x2000000)
 164         return (void *)(x+PAGE_OFFSET);
 165      else
 166         return (void *)(x-0x2000000);
 167 }
 168 #endif  /* CONFIG_SUN3 */
 169
 170 /*
 171  * NOTE: virtual isn't really correct, actually it should be the offset into the
 172  * memory node, but we have no highmem, so that works for now.
 173  * TODO: implement (fast) pfn<->pgdat_idx conversion functions, this makes lots
 174  * of the shifts unnecessary.
 175  */
 176 #define virt_to_pfn(kaddr)      (__pa(kaddr) >> PAGE_SHIFT)
 177 #define pfn_to_virt(pfn)        __va((pfn) << PAGE_SHIFT)
 178
 179 extern int m68k_virt_to_node_shift;
 180
 181 #ifdef CONFIG_SINGLE_MEMORY_CHUNK
 182 #define __virt_to_node(addr)    (&pg_data_map[0])
 183 #else
 184 extern struct pglist_data *pg_data_table[];
 185
 186 static inline __attribute_const__ int __virt_to_node_shift(void)
 187 {
 188         int shift;
 189
 190         asm (
 191                 "1:     moveq   #0,%0\n"
 192                 m68k_fixup(%c1, 1b)
 193                 : "=d" (shift)
 194                 : "i" (m68k_fixup_vnode_shift));
 195         return shift;
 196 }
 197
 198 #define __virt_to_node(addr)    (pg_data_table[(unsigned long)(addr) >> __virt_to_node_shift()])
 199 #endif
 200
 201 #define virt_to_page(addr) ({                                           \
 202         pfn_to_page(virt_to_pfn(addr));                                 \
 203 })
 204 #define page_to_virt(page) ({                                           \
 205         pfn_to_virt(page_to_pfn(page));                                 \
 206 })
 207
 208 #define pfn_to_page(pfn) ({                                             \
 209         unsigned long __pfn = (pfn);                                    \
 210         struct pglist_data *pgdat;                                      \
 211         pgdat = __virt_to_node((unsigned long)pfn_to_virt(__pfn));      \
 212         pgdat->node_mem_map + (__pfn - pgdat->node_start_pfn);          \
 213 })
 214 #define page_to_pfn(_page) ({                                           \
 215         struct page *__p = (_page);                                     \
 216         struct pglist_data *pgdat;                                      \
 217         pgdat = &pg_data_map[page_to_nid(__p)];                         \
 218         ((__p) - pgdat->node_mem_map) + pgdat->node_start_pfn;          \
 219 })
 220
 221 #define virt_addr_valid(kaddr)  ((void *)(kaddr) >= (void *)PAGE_OFFSET && (void *)(kaddr) < high_memory)
 222 #define pfn_valid(pfn)          virt_addr_valid(pfn_to_virt(pfn))
 223
 224 #endif /* __ASSEMBLY__ */
 225
 226 #define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | VM_EXEC | \
 227                                  VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 228
 229 #include <asm-generic/page.h>
 230
 231 #endif /* _M68K_PAGE_H */