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[PATCH] s390: add vmcp interface

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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>
This commit is contained in:
Christian Borntraeger
2005-06-25 14:55:32 -07:00
committed by Linus Torvalds
parent 77fa22450d
commit 6b979de395
15 changed files with 359 additions and 66 deletions
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18
include/asm-s390/cpcmd.h
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@@ -11,14 +11,28 @@
#define __CPCMD__
/*
* the lowlevel function for cpcmd
* the caller of __cpcmd has to ensure that the response buffer is below 2 GB
*/
extern void __cpcmd(char *cmd, char *response, int rlen);
extern int __cpcmd(const char *cmd, char *response, int rlen, int *response_code);
#ifndef __s390x__
#define cpcmd __cpcmd
#else
extern void cpcmd(char *cmd, char *response, int rlen);
/*
* cpcmd is the in-kernel interface for issuing CP commands
*
* cmd: null-terminated command string, max 240 characters
* response: response buffer for VM's textual response
* rlen: size of the response buffer, cpcmd will not exceed this size
* but will cap the output, if its too large. Everything that
* did not fit into the buffer will be silently dropped
* response_code: return pointer for VM's error code
* return value: the size of the response. The caller can check if the buffer
* was large enough by comparing the return value and rlen
* NOTE: If the response buffer is not below 2 GB, cpcmd can sleep
*/
extern int cpcmd(const char *cmd, char *response, int rlen, int *response_code);
#endif /*__s390x__*/
#endif