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 extern unsigned long mm_vtop(unsigned long addr) __attribute__ ((const));
  21 extern unsigned long mm_vtop_fallback (unsigned long) __attribute__ ((const));
  22 extern unsigned long mm_ptov(unsigned long addr) __attribute__ ((const));
  23
  24 #ifdef CONFIG_SINGLE_MEMORY_CHUNK
  25 extern inline unsigned long virt_to_phys(volatile void * address)
  26 {
  27         unsigned long voff = (unsigned long) address;
  28
  29         if (voff < m68k_memory[0].size)
  30                 return m68k_memory[0].addr + voff;
  31         else
  32                 return mm_vtop_fallback(voff);
  33 }
  34
  35 extern inline void * phys_to_virt(unsigned long paddr)
  36 {
  37         unsigned long base = m68k_memory[0].addr;
  38
  39         if ((paddr >=  base) && (paddr < (base + m68k_memory[0].size)))
  40                 return (void *)(paddr - base);
  41 #ifdef CONFIG_AMIGA
  42         /*
  43          * if on an amiga and address is in first 16M, move it
  44          * to the ZTWO_VADDR range
  45          */
  46         if (MACH_IS_AMIGA && paddr < 16*1024*1024)
  47                 return (void *)ZTWO_VADDR(paddr);
  48 #endif
  49         return (void *)paddr;
  50 }
  51 #else
  52 extern inline unsigned long virt_to_phys(volatile void * address)
  53 {
  54         return mm_vtop((unsigned long)address);
  55 }
  56
  57 extern inline void * phys_to_virt(unsigned long address)
  58 {
  59         return (void *) mm_ptov(address);
  60 }
  61 #endif
  62
  63 /*
  64  * IO bus memory addresses are 1:1 with the physical address,
  65  * except on the PCI bus of the Hades.
  66  */
  67 #ifdef CONFIG_HADES
  68 #define virt_to_bus(a) (virt_to_phys(a) + (MACH_IS_HADES ? 0x80000000 : 0))
  69 #define bus_to_virt(a) (phys_to_virt((a) - (MACH_IS_HADES ? 0x80000000 : 0)))
  70 #else
  71 #define virt_to_bus virt_to_phys
  72 #define bus_to_virt phys_to_virt
  73 #endif
  74
  75 #endif
  76 #endif