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 static 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
  64 extern unsigned long m68k_memoffset;
  65
  66 #ifndef CONFIG_SUN3
  67
  68 #define WANT_PAGE_VIRTUAL
  69
  70 static 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))
  81 static 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))
  95 static 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
 105 static 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 static inline unsigned long virt_to_pfn(const void *kaddr)
 124 {
 125         return __pa(kaddr) >> PAGE_SHIFT;
 126 }
 127
 128 static inline void *pfn_to_virt(unsigned long pfn)
 129 {
 130         return __va(pfn << PAGE_SHIFT);
 131 }
 132
 133 extern int m68k_virt_to_node_shift;
 134
 135 #define virt_to_page(addr) ({                                           \
 136         pfn_to_page(virt_to_pfn(addr));                                 \
 137 })
 138 #define page_to_virt(page) ({                                           \
 139         pfn_to_virt(page_to_pfn(page));                                 \
 140 })
 141
 142 #define ARCH_PFN_OFFSET (m68k_memory[0].addr >> PAGE_SHIFT)
 143
 144 #define virt_addr_valid(kaddr)  ((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory)
 145 #define pfn_valid(pfn)          virt_addr_valid(pfn_to_virt(pfn))
 146
 147 #endif /* __ASSEMBLY__ */
 148
 149 #endif /* _M68K_PAGE_MM_H */