]> Pileus Git - ~andy/linux/blob - arch/s390/include/asm/io.h
Merge commit 'c039c332f23e794deb6d6f37b9f07ff3b27fb2cf' into md
[~andy/linux] / arch / s390 / include / asm / io.h
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