target/linux/coldfire/files-2.6.31/arch/m68k/include/asm/cf_virtconvert.h

   1 /*
   2  * Copyright 2007-2009 Freescale Semiconductor, Inc. All Rights Reserved.
   3  */
   4 #ifndef __CF_VIRTCONVERT__
   5 #define __CF_VIRTCONVERT__
   6
   7 /*
   8  * Macros used for converting between virtual and physical mappings.
   9  *
  10  * Coldfire Specific
  11  */
  12
  13 #ifdef __KERNEL__
  14
  15 #include <linux/compiler.h>
  16 #include <linux/mmzone.h>
  17 #include <asm/setup.h>
  18 #include <asm/page.h>
  19
  20 /*
  21  * Change virtual addresses to physical addresses and vv.
  22  */
  23 static inline unsigned long virt_to_phys(void *address)
  24 {
  25         return __pa(address);
  26 }
  27
  28 static inline void *phys_to_virt(unsigned long address)
  29 {
  30         return __va(address);
  31 }
  32
  33 /* Permanent address of a page. */
  34 #ifdef CONFIG_SINGLE_MEMORY_CHUNK
  35 #define page_to_phys(page) \
  36         __pa(PAGE_OFFSET + (((page) - pg_data_map[0].node_mem_map) << PAGE_SHIFT))
  37 #else
  38 #define page_to_phys(_page) ({                                          \
  39         struct page *__page = _page;                                    \
  40         struct pglist_data *pgdat;                                      \
  41         pgdat = pg_data_table[page_to_nid(__page)];                     \
  42         page_to_pfn(__page) << PAGE_SHIFT;                              \
  43 })
  44 #endif
  45
  46 /*
  47  * IO bus memory addresses are 1:1 with the physical address,
  48  */
  49 #ifdef CONFIG_PCI
  50 #define virt_to_bus(a) (a + PCI_DMA_BASE)
  51 #define bus_to_virt(a) (a - PCI_DMA_BASE)
  52 #else
  53 #define virt_to_bus(a) (a)
  54 #define bus_to_virt(a) (a)
  55 #endif
  56
  57 #endif  /* __KERNEL__ */
  58 #endif  /* __CF_VIRTCONVERT__ */