release/src-rt-6.x.4708/linux/linux-2.6.36/arch/m68k/include/asm/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/compiler.h>
  11 #include <linux/mmzone.h>
  12 #include <asm/setup.h>
  13 #include <asm/page.h>
  14
  15 /*
  16  * Change virtual addresses to physical addresses and vv.
  17  */
  18 static inline unsigned long virt_to_phys(void *address)
  19 {
  20         return __pa(address);
  21 }
  22
  23 static inline void *phys_to_virt(unsigned long address)
  24 {
  25         return __va(address);
  26 }
  27
  28 /* Permanent address of a page. */
  29 #ifdef CONFIG_MMU
  30 #ifdef CONFIG_SINGLE_MEMORY_CHUNK
  31 #define page_to_phys(page) \
  32         __pa(PAGE_OFFSET + (((page) - pg_data_map[0].node_mem_map) << PAGE_SHIFT))
  33 #else
  34 #define page_to_phys(page)      (page_to_pfn(page) << PAGE_SHIFT)
  35 #endif
  36 #else
  37 #define page_to_phys(page)      (((page) - mem_map) << PAGE_SHIFT)
  38 #endif
  39
  40 /*
  41  * IO bus memory addresses are 1:1 with the physical address,
  42  */
  43 #define virt_to_bus virt_to_phys
  44 #define bus_to_virt phys_to_virt
  45
  46 #endif
  47 #endif