arch/m68k/include/asm/page_mm.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _M68K_PAGE_MM_H
   3 #define _M68K_PAGE_MM_H
   4
   5 #ifndef __ASSEMBLY__
   6
   7 #include <linux/compiler.h>
   8 #include <asm/module.h>
   9
  10 /*
  11  * We don't need to check for alignment etc.
  12  */
  13 #ifdef CPU_M68040_OR_M68060_ONLY
  14 static inline void copy_page(void *to, void *from)
  15 {
  16   unsigned long tmp;
  17
  18   __asm__ __volatile__("1:\t"
  19                        ".chip 68040\n\t"
  20                        "move16 %1@+,%0@+\n\t"
  21                        "move16 %1@+,%0@+\n\t"
  22                        ".chip 68k\n\t"
  23                        "dbra  %2,1b\n\t"
  24                        : "=a" (to), "=a" (from), "=d" (tmp)
  25                        : "0" (to), "1" (from) , "2" (PAGE_SIZE / 32 - 1)
  26                        );
  27 }
  28
  29 static inline void clear_page(void *page)
  30 {
  31         unsigned long tmp;
  32         unsigned long *sp = page;
  33
  34         *sp++ = 0;
  35         *sp++ = 0;
  36         *sp++ = 0;
  37         *sp++ = 0;
  38
  39         __asm__ __volatile__("1:\t"
  40                              ".chip 68040\n\t"
  41                              "move16 %2@+,%0@+\n\t"
  42                              ".chip 68k\n\t"
  43                              "subqw  #8,%2\n\t"
  44                              "subqw  #8,%2\n\t"
  45                              "dbra   %1,1b\n\t"
  46                              : "=a" (sp), "=d" (tmp)
  47                              : "a" (page), "0" (sp),
  48                                "1" ((PAGE_SIZE - 16) / 16 - 1));
  49 }
  50
  51 #else
  52 #define clear_page(page)        memset((page), 0, PAGE_SIZE)
  53 #define copy_page(to,from)      memcpy((to), (from), PAGE_SIZE)
  54 #endif
  55
  56 #define clear_user_page(addr, vaddr, page)      \
  57         do {    clear_page(addr);               \
  58                 flush_dcache_page(page);        \
  59         } while (0)
  60 #define copy_user_page(to, from, vaddr, page)   \
  61         do {    copy_page(to, from);            \
  62                 flush_dcache_page(page);        \
  63         } while (0)
  64
  65 extern unsigned long m68k_memoffset;
  66
  67 #ifndef CONFIG_SUN3
  68
  69 #define WANT_PAGE_VIRTUAL
  70
  71 static inline unsigned long ___pa(void *vaddr)
  72 {
  73         unsigned long paddr;
  74         asm (
  75                 "1:     addl #0,%0\n"
  76                 m68k_fixup(%c2, 1b+2)
  77                 : "=r" (paddr)
  78                 : "0" (vaddr), "i" (m68k_fixup_memoffset));
  79         return paddr;
  80 }
  81 #define __pa(vaddr)     ___pa((void *)(long)(vaddr))
  82 static inline void *__va(unsigned long paddr)
  83 {
  84         void *vaddr;
  85         asm (
  86                 "1:     subl #0,%0\n"
  87                 m68k_fixup(%c2, 1b+2)
  88                 : "=r" (vaddr)
  89                 : "0" (paddr), "i" (m68k_fixup_memoffset));
  90         return vaddr;
  91 }
  92
  93 #else   /* !CONFIG_SUN3 */
  94 /* This #define is a horrible hack to suppress lots of warnings. --m */
  95 #define __pa(x) ___pa((unsigned long)(x))
  96 static inline unsigned long ___pa(unsigned long x)
  97 {
  98      if(x == 0)
  99           return 0;
 100      if(x >= PAGE_OFFSET)
 101         return (x-PAGE_OFFSET);
 102      else
 103         return (x+0x2000000);
 104 }
 105
 106 static inline void *__va(unsigned long x)
 107 {
 108      if(x == 0)
 109           return (void *)0;
 110
 111      if(x < 0x2000000)
 112         return (void *)(x+PAGE_OFFSET);
 113      else
 114         return (void *)(x-0x2000000);
 115 }
 116 #endif  /* CONFIG_SUN3 */
 117
 118 /*
 119  * NOTE: virtual isn't really correct, actually it should be the offset into the
 120  * memory node, but we have no highmem, so that works for now.
 121  * TODO: implement (fast) pfn<->pgdat_idx conversion functions, this makes lots
 122  * of the shifts unnecessary.
 123  */
 124 #define virt_to_pfn(kaddr)      (__pa(kaddr) >> PAGE_SHIFT)
 125 #define pfn_to_virt(pfn)        __va((pfn) << PAGE_SHIFT)
 126
 127 extern int m68k_virt_to_node_shift;
 128
 129 #ifndef CONFIG_DISCONTIGMEM
 130 #define __virt_to_node(addr)    (&pg_data_map[0])
 131 #else
 132 extern struct pglist_data *pg_data_table[];
 133
 134 static inline __attribute_const__ int __virt_to_node_shift(void)
 135 {
 136         int shift;
 137
 138         asm (
 139                 "1:     moveq   #0,%0\n"
 140                 m68k_fixup(%c1, 1b)
 141                 : "=d" (shift)
 142                 : "i" (m68k_fixup_vnode_shift));
 143         return shift;
 144 }
 145
 146 #define __virt_to_node(addr)    (pg_data_table[(unsigned long)(addr) >> __virt_to_node_shift()])
 147 #endif
 148
 149 #define virt_to_page(addr) ({                                           \
 150         pfn_to_page(virt_to_pfn(addr));                                 \
 151 })
 152 #define page_to_virt(page) ({                                           \
 153         pfn_to_virt(page_to_pfn(page));                                 \
 154 })
 155
 156 #ifdef CONFIG_DISCONTIGMEM
 157 #define pfn_to_page(pfn) ({                                             \
 158         unsigned long __pfn = (pfn);                                    \
 159         struct pglist_data *pgdat;                                      \
 160         pgdat = __virt_to_node((unsigned long)pfn_to_virt(__pfn));      \
 161         pgdat->node_mem_map + (__pfn - pgdat->node_start_pfn);          \
 162 })
 163 #define page_to_pfn(_page) ({                                           \
 164         const struct page *__p = (_page);                               \
 165         struct pglist_data *pgdat;                                      \
 166         pgdat = &pg_data_map[page_to_nid(__p)];                         \
 167         ((__p) - pgdat->node_mem_map) + pgdat->node_start_pfn;          \
 168 })
 169 #else
 170 #define ARCH_PFN_OFFSET (m68k_memory[0].addr)
 171 #include <asm-generic/memory_model.h>
 172 #endif
 173
 174 #define virt_addr_valid(kaddr)  ((void *)(kaddr) >= (void *)PAGE_OFFSET && (void *)(kaddr) < high_memory)
 175 #define pfn_valid(pfn)          virt_addr_valid(pfn_to_virt(pfn))
 176
 177 #endif /* __ASSEMBLY__ */
 178
 179 #endif /* _M68K_PAGE_MM_H */