| /* |
| * 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 |
