1 files changed, 34 insertions, 0 deletions

diff --git a/arch/s390/include/asm/cpcmd.h b/arch/s390/include/asm/cpcmd.h
new file mode 100644
index 000000000000..48a9eab16429
--- /dev/null
+++ b/arch/s390/include/asm/cpcmd.h
@@ -0,0 +1,34 @@
+/*
+ *  arch/s390/kernel/cpcmd.h
+ *
+ *  S390 version
+ *    Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
+ *    Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
+ *               Christian Borntraeger (cborntra@de.ibm.com),
+ */
+
+#ifndef _ASM_S390_CPCMD_H
+#define _ASM_S390_CPCMD_H
+
+/*
+ * the lowlevel function for cpcmd
+ * the caller of __cpcmd has to ensure that the response buffer is below 2 GB
+ */
+extern int __cpcmd(const char *cmd, char *response, int rlen, int *response_code);
+
+/*
+ * 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 /* _ASM_S390_CPCMD_H */