io.h 1.15 KB
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/*
 *  include/asm-s390/io.h
 *
 *  S390 version
 *    Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
 *    Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com)
 *
 *  Derived from "include/asm-i386/io.h"
 */

#ifndef _S390_IO_H
#define _S390_IO_H

#ifdef __KERNEL__

#include <asm/page.h>

#define IO_SPACE_LIMIT 0xffffffff

#define __io_virt(x)            ((void *)(PAGE_OFFSET | (unsigned long)(x)))

/*
 * Change virtual addresses to physical addresses and vv.
 * These are pretty trivial
 */
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static inline unsigned long virt_to_phys(volatile void * address)
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{
	unsigned long real_address;
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	asm volatile(
		 "	lra	%0,0(%1)\n"
		 "	jz	0f\n"
		 "	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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static inline void * phys_to_virt(unsigned long address)
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{
        return __io_virt(address);
}

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#define mmiowb()	do { } while (0)
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/*
 * Convert a physical pointer to a virtual kernel pointer for /dev/mem
 * access
 */
#define xlate_dev_mem_ptr(p)	__va(p)

/*
 * Convert a virtual cached pointer to an uncached pointer
 */
#define xlate_dev_kmem_ptr(p)	p

#endif /* __KERNEL__ */

#endif