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 <asm/setup.h>
  12 #include <asm/page.h>
  13
  14 #ifdef CONFIG_AMIGA
  15 #include <asm/amigahw.h>
  16 #endif
  17
  18 /*
  19  * Change virtual addresses to physical addresses and vv.
  20  */
  21 #ifndef CONFIG_SUN3
  22 extern unsigned long mm_vtop(unsigned long addr) __attribute_const__;
  23 extern unsigned long mm_ptov(unsigned long addr) __attribute_const__;
  24 #else
  25 static inline unsigned long mm_vtop(unsigned long vaddr)
  26 {
  27         return __pa(vaddr);
  28 }
  29
  30 static inline unsigned long mm_ptov(unsigned long paddr)
  31 {
  32         return (unsigned long)__va(paddr);
  33 }
  34 #endif
  35
  36 #ifdef CONFIG_SINGLE_MEMORY_CHUNK
  37 static inline unsigned long virt_to_phys(void *vaddr)
  38 {
  39         return (unsigned long)vaddr - PAGE_OFFSET + m68k_memory[0].addr;
  40 }
  41
  42 static inline void * phys_to_virt(unsigned long paddr)
  43 {
  44         return (void *)(paddr - m68k_memory[0].addr + PAGE_OFFSET);
  45 }
  46 #else
  47 static inline unsigned long virt_to_phys(void *address)
  48 {
  49         return mm_vtop((unsigned long)address);
  50 }
  51
  52 static inline void *phys_to_virt(unsigned long address)
  53 {
  54         return (void *) mm_ptov(address);
  55 }
  56 #endif
  57
  58 /* Permanent address of a page. */
  59 #define __page_address(page)    (PAGE_OFFSET + (((page) - mem_map) << PAGE_SHIFT))
  60 #define page_to_phys(page)      virt_to_phys((void *)__page_address(page))
  61
  62 /*
  63  * IO bus memory addresses are 1:1 with the physical address,
  64  * except on the PCI bus of the Hades.
  65  */
  66 #ifdef CONFIG_HADES
  67 #define virt_to_bus(a) (virt_to_phys(a) + (MACH_IS_HADES ? 0x80000000 : 0))
  68 #define bus_to_virt(a) (phys_to_virt((a) - (MACH_IS_HADES ? 0x80000000 : 0)))
  69 #else
  70 #define virt_to_bus virt_to_phys
  71 #define bus_to_virt phys_to_virt
  72 #endif
  73
  74 #endif
  75 #endif