arch/s390/kernel/cpcmd.c

   1 /*
   2  *  arch/s390/kernel/cpcmd.c
   3  *
   4  *  S390 version
   5  *    Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
   6  *    Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
   7  */
   8
   9 #include <linux/stddef.h>
  10 #include <linux/kernel.h>
  11 #include <linux/string.h>
  12 #include <asm/ebcdic.h>
  13 #include <linux/spinlock.h>
  14 #include <asm/cpcmd.h>
  15 #include <asm/system.h>
  16
  17 static spinlock_t cpcmd_lock = SPIN_LOCK_UNLOCKED;
  18 static char cpcmd_buf[240];
  19
  20 void cpcmd(char *cmd, char *response, int rlen)
  21 {
  22         const int mask = 0x40000000L;
  23         unsigned long flags;
  24         int cmdlen;
  25
  26         spin_lock_irqsave(&cpcmd_lock, flags);
  27         cmdlen = strlen(cmd);
  28         BUG_ON(cmdlen>240);
  29         strcpy(cpcmd_buf, cmd);
  30         ASCEBC(cpcmd_buf, cmdlen);
  31
  32         if (response != NULL && rlen > 0) {
  33 #ifndef CONFIG_ARCH_S390X
  34                 asm volatile ("LRA   2,0(%0)\n\t"
  35                               "LR    4,%1\n\t"
  36                               "O     4,%4\n\t"
  37                               "LRA   3,0(%2)\n\t"
  38                               "LR    5,%3\n\t"
  39                               ".long 0x83240008 # Diagnose X'08'\n\t"
  40                               : /* no output */
  41                               : "a" (cpcmd_buf), "d" (cmdlen),
  42                                 "a" (response), "d" (rlen), "m" (mask)
  43                               : "cc", "2", "3", "4", "5" );
  44 #else /* CONFIG_ARCH_S390X */
  45                 asm volatile ("   lrag  2,0(%0)\n"
  46                               "   lgr   4,%1\n"
  47                               "   o     4,%4\n"
  48                               "   lrag  3,0(%2)\n"
  49                               "   lgr   5,%3\n"
  50                               "   sam31\n"
  51                               "   .long 0x83240008 # Diagnose X'08'\n"
  52                               "   sam64"
  53                               : /* no output */
  54                               : "a" (cpcmd_buf), "d" (cmdlen),
  55                                 "a" (response), "d" (rlen), "m" (mask)
  56                               : "cc", "2", "3", "4", "5" );
  57 #endif /* CONFIG_ARCH_S390X */
  58                 EBCASC(response, rlen);
  59         } else {
  60 #ifndef CONFIG_ARCH_S390X
  61                 asm volatile ("LRA   2,0(%0)\n\t"
  62                               "LR    3,%1\n\t"
  63                               ".long 0x83230008 # Diagnose X'08'\n\t"
  64                               : /* no output */
  65                               : "a" (cpcmd_buf), "d" (cmdlen)
  66                               : "2", "3"  );
  67 #else /* CONFIG_ARCH_S390X */
  68                 asm volatile ("   lrag  2,0(%0)\n"
  69                               "   lgr   3,%1\n"
  70                               "   sam31\n"
  71                               "   .long 0x83230008 # Diagnose X'08'\n"
  72                               "   sam64"
  73                               : /* no output */
  74                               : "a" (cpcmd_buf), "d" (cmdlen)
  75                               : "2", "3"  );
  76 #endif /* CONFIG_ARCH_S390X */
  77         }
  78         spin_unlock_irqrestore(&cpcmd_lock, flags);
  79 }
  80