forked from Minki/linux
6b979de395
Add interface to issue VM control program commands. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
39 lines
1.3 KiB
C
39 lines
1.3 KiB
C
/*
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* arch/s390/kernel/cpcmd.h
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*
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* S390 version
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* Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
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* Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
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* Christian Borntraeger (cborntra@de.ibm.com),
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*/
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#ifndef __CPCMD__
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#define __CPCMD__
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/*
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* the lowlevel function for cpcmd
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* the caller of __cpcmd has to ensure that the response buffer is below 2 GB
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*/
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extern int __cpcmd(const char *cmd, char *response, int rlen, int *response_code);
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#ifndef __s390x__
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#define cpcmd __cpcmd
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#else
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/*
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* cpcmd is the in-kernel interface for issuing CP commands
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*
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* cmd: null-terminated command string, max 240 characters
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* response: response buffer for VM's textual response
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* rlen: size of the response buffer, cpcmd will not exceed this size
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* but will cap the output, if its too large. Everything that
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* did not fit into the buffer will be silently dropped
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* response_code: return pointer for VM's error code
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* return value: the size of the response. The caller can check if the buffer
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* was large enough by comparing the return value and rlen
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* NOTE: If the response buffer is not below 2 GB, cpcmd can sleep
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*/
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extern int cpcmd(const char *cmd, char *response, int rlen, int *response_code);
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#endif /*__s390x__*/
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#endif
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