LXR linux/arch/m68k/include/asm/page

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