include/asm-s390/cpcmd.h

   1 /*
   2  *  arch/s390/kernel/cpcmd.h
   3  *
   4  *  S390 version
   5  *    Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
   6  *    Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
   7  *               Christian Borntraeger (cborntra@de.ibm.com),
   8  */
   9
  10 #ifndef __CPCMD__
  11 #define __CPCMD__
  12
  13 /*
  14  * the lowlevel function for cpcmd
  15  * the caller of __cpcmd has to ensure that the response buffer is below 2 GB
  16  */
  17 extern int __cpcmd(const char *cmd, char *response, int rlen, int *response_code);
  18
  19 #ifndef __s390x__
  20 #define cpcmd __cpcmd
  21 #else
  22 /*
  23  * cpcmd is the in-kernel interface for issuing CP commands
  24  *
  25  * cmd:         null-terminated command string, max 240 characters
  26  * response:    response buffer for VM's textual response
  27  * rlen:        size of the response buffer, cpcmd will not exceed this size
  28  *              but will cap the output, if its too large. Everything that
  29  *              did not fit into the buffer will be silently dropped
  30  * response_code: return pointer for VM's error code
  31  * return value: the size of the response. The caller can check if the buffer
  32  *              was large enough by comparing the return value and rlen
  33  * NOTE: If the response buffer is not below 2 GB, cpcmd can sleep
  34  */
  35 extern int cpcmd(const char *cmd, char *response, int rlen, int *response_code);
  36 #endif /*__s390x__*/
  37
  38 #endif