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diag.c

/*
 * Implementation of s390 diagnose codes
 *
 * Copyright IBM Corp. 2007
 * Author(s): Michael Holzheu <holzheu@de.ibm.com>
 */

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

/*
 * Diagnose 10: Release pages
 */
void diag10(unsigned long addr)
{
      if (addr >= 0x7ff00000)
            return;
      asm volatile(
#ifdef CONFIG_64BIT
            "     sam31\n"
            "     diag  %0,%0,0x10\n"
            "0:   sam64\n"
#else
            "     diag  %0,%0,0x10\n"
            "0:\n"
#endif
            EX_TABLE(0b, 0b)
            : : "a" (addr));
}
EXPORT_SYMBOL(diag10);

/*
 * 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);

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