LXR linux/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 */
  18static inline unsigned long virt_to_phys(void *address)
  19{
  20        return __pa(address);
  21}
  22
  23static 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
  48