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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/arch/s390/include/asm/io.h
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/*

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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 ([email protected])

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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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