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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/arch/s390/kernel/diag.c
10817 views
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/*

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 * Implementation of s390 diagnose codes

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 *

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 * Copyright IBM Corp. 2007

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 * Author(s): Michael Holzheu <[email protected]>

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 */

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#include <linux/module.h>

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#include <asm/diag.h>

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/*

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 * Diagnose 14: Input spool file manipulation

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 */

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int diag14(unsigned long rx, unsigned long ry1, unsigned long subcode)

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{

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	register unsigned long _ry1 asm("2") = ry1;

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	register unsigned long _ry2 asm("3") = subcode;

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	int rc = 0;

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	asm volatile(

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#ifdef CONFIG_64BIT

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		"   sam31\n"

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		"   diag    %2,2,0x14\n"

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		"   sam64\n"

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#else

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		"   diag    %2,2,0x14\n"

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#endif

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		"   ipm     %0\n"

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		"   srl     %0,28\n"

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		: "=d" (rc), "+d" (_ry2)

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		: "d" (rx), "d" (_ry1)

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		: "cc");

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	return rc;

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}

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EXPORT_SYMBOL(diag14);

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/*

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 * Diagnose 210: Get information about a virtual device

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 */

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int diag210(struct diag210 *addr)

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{

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	/*

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	 * diag 210 needs its data below the 2GB border, so we

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	 * use a static data area to be sure

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	 */

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	static struct diag210 diag210_tmp;

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	static DEFINE_SPINLOCK(diag210_lock);

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	unsigned long flags;

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	int ccode;

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	spin_lock_irqsave(&diag210_lock, flags);

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	diag210_tmp = *addr;

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#ifdef CONFIG_64BIT

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	asm volatile(

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		"	lhi	%0,-1\n"

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		"	sam31\n"

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		"	diag	%1,0,0x210\n"

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		"0:	ipm	%0\n"

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		"	srl	%0,28\n"

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		"1:	sam64\n"

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		EX_TABLE(0b, 1b)

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		: "=&d" (ccode) : "a" (&diag210_tmp) : "cc", "memory");

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#else

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	asm volatile(

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		"	lhi	%0,-1\n"

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		"	diag	%1,0,0x210\n"

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		"0:	ipm	%0\n"

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		"	srl	%0,28\n"

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		"1:\n"

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		EX_TABLE(0b, 1b)

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		: "=&d" (ccode) : "a" (&diag210_tmp) : "cc", "memory");

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#endif

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	*addr = diag210_tmp;

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	spin_unlock_irqrestore(&diag210_lock, flags);

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	return ccode;

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}

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EXPORT_SYMBOL(diag210);

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