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                 "   sam31\n"
  22                 "   diag    %2,2,0x14\n"
  23                 "   sam64\n"
  24                 "   ipm     %0\n"
  25                 "   srl     %0,28\n"
  26                 : "=d" (rc), "+d" (_ry2)
  27                 : "d" (rx), "d" (_ry1)
  28                 : "cc");
  29
  30         return rc;
  31 }
  32 EXPORT_SYMBOL(diag14);
  33
  34 /*
  35  * Diagnose 210: Get information about a virtual device
  36  */
  37 int diag210(struct diag210 *addr)
  38 {
  39         /*
  40          * diag 210 needs its data below the 2GB border, so we
  41          * use a static data area to be sure
  42          */
  43         static struct diag210 diag210_tmp;
  44         static DEFINE_SPINLOCK(diag210_lock);
  45         unsigned long flags;
  46         int ccode;
  47
  48         spin_lock_irqsave(&diag210_lock, flags);
  49         diag210_tmp = *addr;
  50
  51         asm volatile(
  52                 "       lhi     %0,-1\n"
  53                 "       sam31\n"
  54                 "       diag    %1,0,0x210\n"
  55                 "0:     ipm     %0\n"
  56                 "       srl     %0,28\n"
  57                 "1:     sam64\n"
  58                 EX_TABLE(0b, 1b)
  59                 : "=&d" (ccode) : "a" (&diag210_tmp) : "cc", "memory");
  60
  61         *addr = diag210_tmp;
  62         spin_unlock_irqrestore(&diag210_lock, flags);
  63
  64         return ccode;
  65 }
  66 EXPORT_SYMBOL(diag210);