text: /*
   *  include/asm-s390/io.h
   *
   *  S390 version
   *    Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
   *    Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com)
   *
   *  Derived from "include/asm-i386/io.h"
   */
  
  #ifndef _S390_IO_H
  #define _S390_IO_H
  
  #ifdef __KERNEL__
  
  #include <asm/page.h>
  
  #define IO_SPACE_LIMIT 0xffffffff
  
  /*
   * Change virtual addresses to physical addresses and vv.
   * These are pretty trivial
   */
  static inline unsigned long virt_to_phys(volatile void * address)
  {
  	unsigned long real_address;
  	asm volatile(
  		 "	lra	%0,0(%1)\n"
  		 "	jz	0f\n"
  		 "	la	%0,0\n"
                   "0:"
  		 : "=a" (real_address) : "a" (address) : "cc");
          return real_address;
  }
  
  static inline void * phys_to_virt(unsigned long address)
  {
  	return (void *) address;
  }
  
  /*
   * Convert a physical pointer to a virtual kernel pointer for /dev/mem
   * access
   */
  #define xlate_dev_mem_ptr(p)	__va(p)
  
  /*
   * Convert a virtual cached pointer to an uncached pointer
   */
  #define xlate_dev_kmem_ptr(p)	p
  
  #endif /* __KERNEL__ */
  
  #endif
  