include/asm/cpcmd.h

0001 /* SPDX-License-Identifier: GPL-2.0 */
0002 /*
0003  *  S390 version
0004  *    Copyright IBM Corp. 1999
0005  *    Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
0006  *               Christian Borntraeger (cborntra@de.ibm.com),
0007  */
0008
0009 #ifndef _ASM_S390_CPCMD_H
0010 #define _ASM_S390_CPCMD_H
0011
0012 /*
0013  * the lowlevel function for cpcmd
0014  */
0015 int __cpcmd(const char *cmd, char *response, int rlen, int *response_code);
0016
0017 /*
0018  * cpcmd is the in-kernel interface for issuing CP commands
0019  *
0020  * cmd:     null-terminated command string, max 240 characters
0021  * response:    response buffer for VM's textual response
0022  * rlen:    size of the response buffer, cpcmd will not exceed this size
0023  *      but will cap the output, if its too large. Everything that
0024  *      did not fit into the buffer will be silently dropped
0025  * response_code: return pointer for VM's error code
0026  * return value: the size of the response. The caller can check if the buffer
0027  *      was large enough by comparing the return value and rlen
0028  * NOTE: If the response buffer is not in real storage, cpcmd can sleep
0029  */
0030 int cpcmd(const char *cmd, char *response, int rlen, int *response_code);
0031
0032 #endif /* _ASM_S390_CPCMD_H */