arch/s390/kernel/diag.c

   1 /*
   2  * Implementation of s390 diagnose codes
   3  *
   4  * Copyright IBM Corp. 2007
   5  * Author(s): Michael Holzheu <holzheu@de.ibm.com>
   6  */
   7
   8 #include <linux/module.h>
   9 #include <asm/diag.h>
  10
  11 /*
  12  * Diagnose 14: Input spool file manipulation
  13  */
  14 int diag14(unsigned long rx, unsigned long ry1, unsigned long subcode)
  15 {
  16         register unsigned long _ry1 asm("2") = ry1;
  17         register unsigned long _ry2 asm("3") = subcode;
  18         int rc = 0;
  19
  20         asm volatile(
  21 #ifdef CONFIG_64BIT
  22                 "   sam31\n"
  23                 "   diag    %2,2,0x14\n"
  24                 "   sam64\n"
  25 #else
  26                 "   diag    %2,2,0x14\n"
  27 #endif
  28                 "   ipm     %0\n"
  29                 "   srl     %0,28\n"
  30                 : "=d" (rc), "+d" (_ry2)
  31                 : "d" (rx), "d" (_ry1)
  32                 : "cc");
  33
  34         return rc;
  35 }
  36 EXPORT_SYMBOL(diag14);
  37
  38 /*
  39  * Diagnose 210: Get information about a virtual device
  40  */
  41 int diag210(struct diag210 *addr)
  42 {
  43         /*
  44          * diag 210 needs its data below the 2GB border, so we
  45          * use a static data area to be sure
  46          */
  47         static struct diag210 diag210_tmp;
  48         static DEFINE_SPINLOCK(diag210_lock);
  49         unsigned long flags;
  50         int ccode;
  51
  52         spin_lock_irqsave(&diag210_lock, flags);
  53         diag210_tmp = *addr;
  54
  55 #ifdef CONFIG_64BIT
  56         asm volatile(
  57                 "       lhi     %0,-1\n"
  58                 "       sam31\n"
  59                 "       diag    %1,0,0x210\n"
  60                 "0:     ipm     %0\n"
  61                 "       srl     %0,28\n"
  62                 "1:     sam64\n"
  63                 EX_TABLE(0b, 1b)
  64                 : "=&d" (ccode) : "a" (&diag210_tmp) : "cc", "memory");
  65 #else
  66         asm volatile(
  67                 "       lhi     %0,-1\n"
  68                 "       diag    %1,0,0x210\n"
  69                 "0:     ipm     %0\n"
  70                 "       srl     %0,28\n"
  71                 "1:\n"
  72                 EX_TABLE(0b, 1b)
  73                 : "=&d" (ccode) : "a" (&diag210_tmp) : "cc", "memory");
  74 #endif
  75
  76         *addr = diag210_tmp;
  77         spin_unlock_irqrestore(&diag210_lock, flags);
  78
  79         return ccode;
  80 }
  81 EXPORT_SYMBOL(diag210);