arch/s390/include/asm/cpcmd.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  *  S390 version
   4  *    Copyright IBM Corp. 1999
   5  *    Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
   6  *               Christian Borntraeger (cborntra@de.ibm.com),
   7  */
   8
   9 #ifndef _ASM_S390_CPCMD_H
  10 #define _ASM_S390_CPCMD_H
  11
  12 /*
  13  * the lowlevel function for cpcmd
  14  */
  15 int __cpcmd(const char *cmd, char *response, int rlen, int *response_code);
  16
  17 /*
  18  * cpcmd is the in-kernel interface for issuing CP commands
  19  *
  20  * cmd:         null-terminated command string, max 240 characters
  21  * response:    response buffer for VM's textual response
  22  * rlen:        size of the response buffer, cpcmd will not exceed this size
  23  *              but will cap the output, if its too large. Everything that
  24  *              did not fit into the buffer will be silently dropped
  25  * response_code: return pointer for VM's error code
  26  * return value: the size of the response. The caller can check if the buffer
  27  *              was large enough by comparing the return value and rlen
  28  * NOTE: If the response buffer is not in real storage, cpcmd can sleep
  29  */
  30 int cpcmd(const char *cmd, char *response, int rlen, int *response_code);
  31
  32 #endif /* _ASM_S390_CPCMD_H */