arch/s390/kernel/reipl_diag.c

   1 /*
   2  * This file contains the implementation of the
   3  * Linux re-IPL support
   4  *
   5  * (C) Copyright IBM Corp. 2005
   6  *
   7  * Author(s): Volker Sameske (sameske@de.ibm.com)
   8  *
   9  */
  10
  11 #include <linux/kernel.h>
  12
  13 static unsigned int reipl_diag_rc1;
  14 static unsigned int reipl_diag_rc2;
  15
  16 /*
  17  * re-IPL the system using the last used IPL parameters
  18  */
  19 void reipl_diag(void)
  20 {
  21         asm volatile (
  22                 "   la   %%r4,0\n"
  23                 "   la   %%r5,0\n"
  24                 "   diag %%r4,%2,0x308\n"
  25                 "0:\n"
  26                 "   st   %%r4,%0\n"
  27                 "   st   %%r5,%1\n"
  28                 ".section __ex_table,\"a\"\n"
  29 #ifdef CONFIG_64BIT
  30                 "   .align 8\n"
  31                 "   .quad 0b, 0b\n"
  32 #else
  33                 "   .align 4\n"
  34                 "   .long 0b, 0b\n"
  35 #endif
  36                 ".previous\n"
  37                 : "=m" (reipl_diag_rc1), "=m" (reipl_diag_rc2)
  38                 : "d" (3) : "cc", "4", "5" );
  39 }