diag.c

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/*
 * Implementation of s390 diagnose codes
 *
 * Copyright IBM Corp. 2007
 * Author(s): Michael Holzheu <[email protected]>
 */

#include <linux/module.h>
#include <asm/diag.h>

/*
 * Diagnose 14: Input spool file manipulation
 */
int diag14(unsigned long rx, unsigned long ry1, unsigned long subcode)
{
    register unsigned long _ry1 asm("2") = ry1;
    register unsigned long _ry2 asm("3") = subcode;
    int rc = 0;

    asm volatile(
#ifdef CONFIG_64BIT
        "   sam31\n"
        "   diag    %2,2,0x14\n"
        "   sam64\n"
#else
        "   diag    %2,2,0x14\n"
#endif
        "   ipm     %0\n"
        "   srl     %0,28\n"
        : "=d" (rc), "+d" (_ry2)
        : "d" (rx), "d" (_ry1)
        : "cc");

    return rc;
}
EXPORT_SYMBOL(diag14);

/*
 * Diagnose 210: Get information about a virtual device
 */
int diag210(struct diag210 *addr)
{
    /*
     * diag 210 needs its data below the 2GB border, so we
     * use a static data area to be sure
     */
    static struct diag210 diag210_tmp;
    static DEFINE_SPINLOCK(diag210_lock);
    unsigned long flags;
    int ccode;

    spin_lock_irqsave(&diag210_lock, flags);
    diag210_tmp = *addr;

#ifdef CONFIG_64BIT
    asm volatile(
        "   lhi %0,-1\n"
        "   sam31\n"
        "   diag    %1,0,0x210\n"
        "0: ipm %0\n"
        "   srl %0,28\n"
        "1: sam64\n"
        EX_TABLE(0b, 1b)
        : "=&d" (ccode) : "a" (&diag210_tmp) : "cc", "memory");
#else
    asm volatile(
        "   lhi %0,-1\n"
        "   diag    %1,0,0x210\n"
        "0: ipm %0\n"
        "   srl %0,28\n"
        "1:\n"
        EX_TABLE(0b, 1b)
        : "=&d" (ccode) : "a" (&diag210_tmp) : "cc", "memory");
#endif

    *addr = diag210_tmp;
    spin_unlock_irqrestore(&diag210_lock, flags);

    return ccode;
}
EXPORT_SYMBOL(diag210);