| /* | |
| * 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 |