drivers/s390/char/vmcp.h

   1 /*
   2  * Copyright (C) 2004, 2005 IBM Corporation
   3  * Interface implementation for communication with the z/VM control program
   4  * Version 1.0
   5  * Author(s): Christian Borntraeger <cborntra@de.ibm.com>
   6  *
   7  *
   8  * z/VMs CP offers the possibility to issue commands via the diagnose code 8
   9  * this driver implements a character device that issues these commands and
  10  * returns the answer of CP.
  11  *
  12  * The idea of this driver is based on cpint from Neale Ferguson
  13  */
  14
  15 #include <asm/semaphore.h>
  16 #include <linux/ioctl.h>
  17
  18 #define VMCP_GETCODE _IOR(0x10, 1, int)
  19 #define VMCP_SETBUF _IOW(0x10, 2, int)
  20 #define VMCP_GETSIZE _IOR(0x10, 3, int)
  21
  22 struct vmcp_session {
  23         unsigned int bufsize;
  24         char *response;
  25         int resp_size;
  26         int resp_code;
  27         /* As we use copy_from/to_user, which might     *
  28          * sleep and cannot use a spinlock              */
  29         struct semaphore mutex;
  30 };