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 <linux/compiler.h>
  12 #include <asm/setup.h>
  13 #include <asm/page.h>
  14
  15 #ifdef CONFIG_AMIGA
  16 #include <asm/amigahw.h>
  17 #endif
  18
  19 /*
  20  * Change virtual addresses to physical addresses and vv.
  21  */
  22 #ifndef CONFIG_SUN3
  23 extern unsigned long mm_vtop(unsigned long addr) __attribute_const__;
  24 extern unsigned long mm_ptov(unsigned long addr) __attribute_const__;
  25 #else
  26 static inline unsigned long mm_vtop(unsigned long vaddr)
  27 {
  28         return __pa(vaddr);
  29 }
  30
  31 static 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 static inline unsigned long virt_to_phys(void *vaddr)
  39 {
  40         return (unsigned long)vaddr - PAGE_OFFSET + m68k_memory[0].addr;
  41 }
  42
  43 static inline void * phys_to_virt(unsigned long paddr)
  44 {
  45         return (void *)(paddr - m68k_memory[0].addr + PAGE_OFFSET);
  46 }
  47 #else
  48 static inline unsigned long virt_to_phys(void *address)
  49 {
  50         return mm_vtop((unsigned long)address);
  51 }
  52
  53 static inline void *phys_to_virt(unsigned long address)
  54 {
  55         return (void *) mm_ptov(address);
  56 }
  57 #endif
  58
  59 /* Permanent address of a page. */
  60 #define __page_address(page)    (PAGE_OFFSET + (((page) - mem_map) << PAGE_SHIFT))
  61 #define page_to_phys(page)      virt_to_phys((void *)__page_address(page))
  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