LXR linux/drivers/s390/char/vmcp.h

   1/*
   2 * Copyright IBM Corp. 2004, 2005
   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 <linux/ioctl.h>
  16#include <linux/mutex.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
  22struct 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 mutex mutex;
  30};
  31