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/arch/s390/include/asm/io.h

https://bitbucket.org/thekraven/iscream_thunderc-2.6.35
C++ Header | 54 lines | 24 code | 10 blank | 20 comment | 0 complexity | 97ccc3d211dd98a74bb672b98ce612d5 MD5 | raw file
Possible License(s): GPL-2.0, LGPL-2.0, AGPL-1.0
 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#ifdef __KERNEL__
15
16#include <asm/page.h>
17
18#define IO_SPACE_LIMIT 0xffffffff
19
20/*
21 * Change virtual addresses to physical addresses and vv.
22 * These are pretty trivial
23 */
24static inline unsigned long virt_to_phys(volatile void * address)
25{
26	unsigned long real_address;
27	asm volatile(
28		 "	lra	%0,0(%1)\n"
29		 "	jz	0f\n"
30		 "	la	%0,0\n"
31                 "0:"
32		 : "=a" (real_address) : "a" (address) : "cc");
33        return real_address;
34}
35
36static inline void * phys_to_virt(unsigned long address)
37{
38	return (void *) address;
39}
40
41/*
42 * Convert a physical pointer to a virtual kernel pointer for /dev/mem
43 * access
44 */
45#define xlate_dev_mem_ptr(p)	__va(p)
46
47/*
48 * Convert a virtual cached pointer to an uncached pointer
49 */
50#define xlate_dev_kmem_ptr(p)	p
51
52#endif /* __KERNEL__ */
53
54#endif