release/src-rt-6.x.4708/linux/linux-2.6.36/arch/s390/include/asm/tape390.h

   1 /*************************************************************************
   2  *
   3  * tape390.h
   4  *         enables user programs to display messages and control encryption
   5  *         on s390 tape devices
   6  *
   7  *         Copyright IBM Corp. 2001,2006
   8  *         Author(s): Michael Holzheu <holzheu@de.ibm.com>
   9  *
  10  *************************************************************************/
  11
  12 #ifndef _TAPE390_H
  13 #define _TAPE390_H
  14
  15 #define TAPE390_DISPLAY _IOW('d', 1, struct display_struct)
  16
  17 /*
  18  * The TAPE390_DISPLAY ioctl calls the Load Display command
  19  * which transfers 17 bytes of data from the channel to the subsystem:
  20  *     - 1 format control byte, and
  21  *     - two 8-byte messages
  22  *
  23  * Format control byte:
  24  *   0-2: New Message Overlay
  25  *     3: Alternate Messages
  26  *     4: Blink Message
  27  *     5: Display Low/High Message
  28  *     6: Reserved
  29  *     7: Automatic Load Request
  30  *
  31  */
  32
  33 typedef struct display_struct {
  34         char cntrl;
  35         char message1[8];
  36         char message2[8];
  37 } display_struct;
  38
  39 /*
  40  * Tape encryption support
  41  */
  42
  43 struct tape390_crypt_info {
  44         char capability;
  45         char status;
  46         char medium_status;
  47 } __attribute__ ((packed));
  48
  49
  50 /* Macros for "capable" field */
  51 #define TAPE390_CRYPT_SUPPORTED_MASK 0x01
  52 #define TAPE390_CRYPT_SUPPORTED(x) \
  53         ((x.capability & TAPE390_CRYPT_SUPPORTED_MASK))
  54
  55 /* Macros for "status" field */
  56 #define TAPE390_CRYPT_ON_MASK 0x01
  57 #define TAPE390_CRYPT_ON(x) (((x.status) & TAPE390_CRYPT_ON_MASK))
  58
  59 /* Macros for "medium status" field */
  60 #define TAPE390_MEDIUM_LOADED_MASK 0x01
  61 #define TAPE390_MEDIUM_ENCRYPTED_MASK 0x02
  62 #define TAPE390_MEDIUM_ENCRYPTED(x) \
  63         (((x.medium_status) & TAPE390_MEDIUM_ENCRYPTED_MASK))
  64 #define TAPE390_MEDIUM_LOADED(x) \
  65         (((x.medium_status) & TAPE390_MEDIUM_LOADED_MASK))
  66
  67 /*
  68  * The TAPE390_CRYPT_SET ioctl is used to switch on/off encryption.
  69  * The "encryption_capable" and "tape_status" fields are ignored for this ioctl!
  70  */
  71 #define TAPE390_CRYPT_SET _IOW('d', 2, struct tape390_crypt_info)
  72
  73 /*
  74  * The TAPE390_CRYPT_QUERY ioctl is used to query the encryption state.
  75  */
  76 #define TAPE390_CRYPT_QUERY _IOR('d', 3, struct tape390_crypt_info)
  77
  78 /* Values for "kekl1/2_type" and "kekl1/2_type_on_tape" fields */
  79 #define TAPE390_KEKL_TYPE_NONE 0
  80 #define TAPE390_KEKL_TYPE_LABEL 1
  81 #define TAPE390_KEKL_TYPE_HASH 2
  82
  83 struct tape390_kekl {
  84         unsigned char type;
  85         unsigned char type_on_tape;
  86         char label[65];
  87 } __attribute__ ((packed));
  88
  89 struct tape390_kekl_pair {
  90         struct tape390_kekl kekl[2];
  91 } __attribute__ ((packed));
  92
  93 /*
  94  * The TAPE390_KEKL_SET ioctl is used to set Key Encrypting Key labels.
  95  */
  96 #define TAPE390_KEKL_SET _IOW('d', 4, struct tape390_kekl_pair)
  97
  98 /*
  99  * The TAPE390_KEKL_QUERY ioctl is used to query Key Encrypting Key labels.
 100  */
 101 #define TAPE390_KEKL_QUERY _IOR('d', 5, struct tape390_kekl_pair)
 102
 103 #endif