i386/linux/linux-2.3.21/include/asm-m68k/virtconvert.h

   1 #ifndef __VIRT_CONVERT__
   2 #define __VIRT_CONVERT__
   3
   4 /*
   5  * Macros used for converting between virtual and physical mappings.
   6  */
   7
   8 #ifdef __KERNEL__
   9
  10 #include <linux/config.h>
  11 #include <asm/setup.h>
  12
  13 #ifdef CONFIG_AMIGA
  14 #include <asm/amigahw.h>
  15 #endif
  16
  17 /*
  18  * Change virtual addresses to physical addresses and vv.
  19  */
  20 #ifndef CONFIG_SUN3
  21 extern unsigned long mm_vtop(unsigned long addr) __attribute__ ((const));
  22 extern unsigned long mm_vtop_fallback (unsigned long) __attribute__ ((const));
  23 extern unsigned long mm_ptov(unsigned long addr) __attribute__ ((const));
  24 #else
  25 extern inline unsigned long mm_vtop(unsigned long vaddr)
  26 {
  27         return __pa(vaddr);
  28 }
  29
  30 extern inline unsigned long mm_ptov(unsigned long paddr)
  31 {
  32         return (unsigned long)__va(paddr);
  33 }
  34 #endif
  35
  36 #ifdef CONFIG_SINGLE_MEMORY_CHUNK
  37 extern inline unsigned long virt_to_phys(volatile void * address)
  38 {
  39         unsigned long voff = (unsigned long) address;
  40
  41         if (voff < m68k_memory[0].size)
  42                 return m68k_memory[0].addr + voff;
  43         else
  44                 return mm_vtop_fallback(voff);
  45 }
  46
  47 extern inline void * phys_to_virt(unsigned long paddr)
  48 {
  49         unsigned long base = m68k_memory[0].addr;
  50
  51         if ((paddr >=  base) && (paddr < (base + m68k_memory[0].size)))
  52                 return (void *)(paddr - base);
  53 #ifdef CONFIG_AMIGA
  54         /*
  55          * if on an amiga and address is in first 16M, move it
  56          * to the ZTWO_VADDR range
  57          */
  58         if (MACH_IS_AMIGA && paddr < 16*1024*1024)
  59                 return (void *)ZTWO_VADDR(paddr);
  60 #endif
  61         return (void *)paddr;
  62 }
  63 #else
  64 extern inline unsigned long virt_to_phys(volatile void * address)
  65 {
  66         return mm_vtop((unsigned long)address);
  67 }
  68
  69 extern inline void * phys_to_virt(unsigned long address)
  70 {
  71         return (void *) mm_ptov(address);
  72 }
  73 #endif
  74
  75 /*
  76  * IO bus memory addresses are 1:1 with the physical address,
  77  * except on the PCI bus of the Hades.
  78  */
  79 #ifdef CONFIG_HADES
  80 #define virt_to_bus(a) (virt_to_phys(a) + (MACH_IS_HADES ? 0x80000000 : 0))
  81 #define bus_to_virt(a) (phys_to_virt((a) - (MACH_IS_HADES ? 0x80000000 : 0)))
  82 #else
  83 #define virt_to_bus virt_to_phys
  84 #define bus_to_virt phys_to_virt
  85 #endif
  86
  87 #endif
  88 #endif