include/asm-um/io.h

   1 #ifndef __UM_IO_H
   2 #define __UM_IO_H
   3
   4 #include "asm/page.h"
   5
   6 #define IO_SPACE_LIMIT 0xdeadbeef /* Sure hope nothing uses this */
   7
   8 static inline int inb(unsigned long i) { return(0); }
   9 static inline void outb(char c, unsigned long i) { }
  10
  11 /*
  12  * Change virtual addresses to physical addresses and vv.
  13  * These are pretty trivial
  14  */
  15 static inline unsigned long virt_to_phys(volatile void * address)
  16 {
  17         return __pa((void *) address);
  18 }
  19
  20 static inline void * phys_to_virt(unsigned long address)
  21 {
  22         return __va(address);
  23 }
  24
  25 /*
  26  * Convert a physical pointer to a virtual kernel pointer for /dev/mem
  27  * access
  28  */
  29 #define xlate_dev_mem_ptr(p)    __va(p)
  30
  31 /*
  32  * Convert a virtual cached pointer to an uncached pointer
  33  */
  34 #define xlate_dev_kmem_ptr(p)   p
  35
  36 static inline void writeb(unsigned char b, volatile void __iomem *addr)
  37 {
  38         *(volatile unsigned char __force *) addr = b;
  39 }
  40 static inline void writew(unsigned short b, volatile void __iomem *addr)
  41 {
  42         *(volatile unsigned short __force *) addr = b;
  43 }
  44 static inline void writel(unsigned int b, volatile void __iomem *addr)
  45 {
  46         *(volatile unsigned int __force *) addr = b;
  47 }
  48 #define __raw_writeb writeb
  49 #define __raw_writew writew
  50 #define __raw_writel writel
  51
  52 #endif