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/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_SINGLE_MEMORY_CHUNK
  30 #define page_to_phys(page) \
  31         __pa(PAGE_OFFSET + (((page) - pg_data_map[0].node_mem_map) << PAGE_SHIFT))
  32 #else
  33 #define page_to_phys(_page) ({                                          \
  34         struct page *__page = _page;                                    \
  35         struct pglist_data *pgdat;                                      \
  36         pgdat = pg_data_table[page_to_nid(__page)];                     \
  37         page_to_pfn(__page) << PAGE_SHIFT;                              \
  38 })
  39 #endif
  40
  41 /*
  42  * IO bus memory addresses are 1:1 with the physical address,
  43  * except on the PCI bus of the Hades.
  44  */
  45 #ifdef CONFIG_HADES
  46 #define virt_to_bus(a) (virt_to_phys(a) + (MACH_IS_HADES ? 0x80000000 : 0))
  47 #define bus_to_virt(a) (phys_to_virt((a) - (MACH_IS_HADES ? 0x80000000 : 0)))
  48 #else
  49 #define virt_to_bus virt_to_phys
  50 #define bus_to_virt phys_to_virt
  51 #endif
  52
  53 #endif
  54 #endif