Merge branch 'linus' into core/softirq
[linux-2.6] / include / asm-s390 / io.h
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  */
24 static 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
36 static 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