LXR linux/arch/um/include/asm/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
   8static inline int inb(unsigned long i) { return(0); }
   9static 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 */
  15static inline unsigned long virt_to_phys(volatile void * address)
  16{
  17        return __pa((void *) address);
  18}
  19
  20static 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
  36static inline void writeb(unsigned char b, volatile void __iomem *addr)
  37{
  38        *(volatile unsigned char __force *) addr = b;
  39}
  40static inline void writew(unsigned short b, volatile void __iomem *addr)
  41{
  42        *(volatile unsigned short __force *) addr = b;
  43}
  44static inline void writel(unsigned int b, volatile void __iomem *addr)
  45{
  46        *(volatile unsigned int __force *) addr = b;
  47}
  48static inline void writeq(unsigned int b, volatile void __iomem *addr)
  49{
  50        *(volatile unsigned long long __force *) addr = b;
  51}
  52#define __raw_writeb writeb
  53#define __raw_writew writew
  54#define __raw_writel writel
  55#define __raw_writeq writeq
  56
  57#endif
  58