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