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 10: Release pages
  13  */
  14 void diag10(unsigned long addr)
  15 {
  16         if (addr >= 0x7ff00000)
  17                 return;
  18         asm volatile(
  19 #ifdef CONFIG_64BIT
  20                 "       sam31\n"
  21                 "       diag    %0,%0,0x10\n"
  22                 "0:     sam64\n"
  23 #else
  24                 "       diag    %0,%0,0x10\n"
  25                 "0:\n"
  26 #endif
  27                 EX_TABLE(0b, 0b)
  28                 : : "a" (addr));
  29 }
  30 EXPORT_SYMBOL(diag10);
  31
  32 /*
  33  * Diagnose 14: Input spool file manipulation
  34  */
  35 int diag14(unsigned long rx, unsigned long ry1, unsigned long subcode)
  36 {
  37         register unsigned long _ry1 asm("2") = ry1;
  38         register unsigned long _ry2 asm("3") = subcode;
  39         int rc = 0;
  40
  41         asm volatile(
  42 #ifdef CONFIG_64BIT
  43                 "   sam31\n"
  44                 "   diag    %2,2,0x14\n"
  45                 "   sam64\n"
  46 #else
  47                 "   diag    %2,2,0x14\n"
  48 #endif
  49                 "   ipm     %0\n"
  50                 "   srl     %0,28\n"
  51                 : "=d" (rc), "+d" (_ry2)
  52                 : "d" (rx), "d" (_ry1)
  53                 : "cc");
  54
  55         return rc;
  56 }
  57 EXPORT_SYMBOL(diag14);
  58
  59 /*
  60  * Diagnose 210: Get information about a virtual device
  61  */
  62 int diag210(struct diag210 *addr)
  63 {
  64         /*
  65          * diag 210 needs its data below the 2GB border, so we
  66          * use a static data area to be sure
  67          */
  68         static struct diag210 diag210_tmp;
  69         static DEFINE_SPINLOCK(diag210_lock);
  70         unsigned long flags;
  71         int ccode;
  72
  73         spin_lock_irqsave(&diag210_lock, flags);
  74         diag210_tmp = *addr;
  75
  76 #ifdef CONFIG_64BIT
  77         asm volatile(
  78                 "       lhi     %0,-1\n"
  79                 "       sam31\n"
  80                 "       diag    %1,0,0x210\n"
  81                 "0:     ipm     %0\n"
  82                 "       srl     %0,28\n"
  83                 "1:     sam64\n"
  84                 EX_TABLE(0b, 1b)
  85                 : "=&d" (ccode) : "a" (&diag210_tmp) : "cc", "memory");
  86 #else
  87         asm volatile(
  88                 "       lhi     %0,-1\n"
  89                 "       diag    %1,0,0x210\n"
  90                 "0:     ipm     %0\n"
  91                 "       srl     %0,28\n"
  92                 "1:\n"
  93                 EX_TABLE(0b, 1b)
  94                 : "=&d" (ccode) : "a" (&diag210_tmp) : "cc", "memory");
  95 #endif
  96
  97         *addr = diag210_tmp;
  98         spin_unlock_irqrestore(&diag210_lock, flags);
  99
 100         return ccode;
 101 }
 102 EXPORT_SYMBOL(diag210);