54 lines
1 KiB
C
54 lines
1 KiB
C
/*
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* include/asm-s390/io.h
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*
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* S390 version
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* Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
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* Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com)
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*
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* Derived from "include/asm-i386/io.h"
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*/
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#ifndef _S390_IO_H
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#define _S390_IO_H
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#ifdef __KERNEL__
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#include <asm/page.h>
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#define IO_SPACE_LIMIT 0xffffffff
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/*
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* Change virtual addresses to physical addresses and vv.
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* These are pretty trivial
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*/
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static inline unsigned long virt_to_phys(volatile void * address)
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{
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unsigned long real_address;
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asm volatile(
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" lra %0,0(%1)\n"
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" jz 0f\n"
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" la %0,0\n"
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"0:"
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: "=a" (real_address) : "a" (address) : "cc");
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return real_address;
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}
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static inline void * phys_to_virt(unsigned long address)
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{
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return (void *) address;
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}
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/*
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* Convert a physical pointer to a virtual kernel pointer for /dev/mem
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* access
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*/
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#define xlate_dev_mem_ptr(p) __va(p)
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/*
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* Convert a virtual cached pointer to an uncached pointer
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*/
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#define xlate_dev_kmem_ptr(p) p
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#endif /* __KERNEL__ */
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#endif
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