1 /* 2 * include/asm-s390/io.h 3 * 4 * S390 version 5 * Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation 6 * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com) 7 * 8 * Derived from "include/asm-i386/io.h" 9 */ 10 11 #ifndef _S390_IO_H 12 #define _S390_IO_H 13 14 #include <asm/page.h> 15 16 #define IO_SPACE_LIMIT 0xffffffff 17 18 /* 19 * Change virtual addresses to physical addresses and vv. 20 * These are pretty trivial 21 */ 22 static inline unsigned long virt_to_phys(volatile void * address) 23 { 24 unsigned long real_address; 25 asm volatile( 26 " lra %0,0(%1)\n" 27 " jz 0f\n" 28 " la %0,0\n" 29 "0:" 30 : "=a" (real_address) : "a" (address) : "cc"); 31 return real_address; 32 } 33 34 static inline void * phys_to_virt(unsigned long address) 35 { 36 return (void *) address; 37 } 38 39 void *xlate_dev_mem_ptr(unsigned long phys); 40 void unxlate_dev_mem_ptr(unsigned long phys, void *addr); 41 42 /* 43 * Convert a virtual cached pointer to an uncached pointer 44 */ 45 #define xlate_dev_kmem_ptr(p) p 46 47 #endif 48