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