/*************************************************************************
*
* enables user programs to display messages and control encryption
* on s390 tape devices
*
* Copyright IBM Corp. 2001, 2006
* Author(s): Michael Holzheu <[email protected]>
*
*************************************************************************/

#ifndef _TAPE390_H
#define _TAPE390_H

#define TAPE390_DISPLAY _IOW('d', 1, struct display_struct)

/*
* The TAPE390_DISPLAY ioctl calls the Load Display command
* which transfers 17 bytes of data from the channel to the subsystem:
* - 1 format control byte, and
* - two 8-byte messages
*
* Format control byte:
* 0-2: New Message Overlay
* 3: Alternate Messages
* 4: Blink Message
* 5: Display Low/High Message
* 6: Reserved
* 7: Automatic Load Request
*
*/

typedef struct display_struct {
char cntrl;
char message1[8];
char message2[8];
} display_struct;

/*
* Tape encryption support
*/

struct tape390_crypt_info {
char capability;
char status;
char medium_status;
} __attribute__ ((packed));


/* Macros for "capable" field */
#define TAPE390_CRYPT_SUPPORTED_MASK 0x01
#define TAPE390_CRYPT_SUPPORTED(x) \
((x.capability & TAPE390_CRYPT_SUPPORTED_MASK))

/* Macros for "status" field */
#define TAPE390_CRYPT_ON_MASK 0x01
#define TAPE390_CRYPT_ON(x) (((x.status) & TAPE390_CRYPT_ON_MASK))

/* Macros for "medium status" field */
#define TAPE390_MEDIUM_LOADED_MASK 0x01
#define TAPE390_MEDIUM_ENCRYPTED_MASK 0x02
#define TAPE390_MEDIUM_ENCRYPTED(x) \
(((x.medium_status) & TAPE390_MEDIUM_ENCRYPTED_MASK))
#define TAPE390_MEDIUM_LOADED(x) \
(((x.medium_status) & TAPE390_MEDIUM_LOADED_MASK))

/*
* The TAPE390_CRYPT_SET ioctl is used to switch on/off encryption.
* The "encryption_capable" and "tape_status" fields are ignored for this ioctl!
*/
#define TAPE390_CRYPT_SET _IOW('d', 2, struct tape390_crypt_info)

/*
* The TAPE390_CRYPT_QUERY ioctl is used to query the encryption state.
*/
#define TAPE390_CRYPT_QUERY _IOR('d', 3, struct tape390_crypt_info)

/* Values for "kekl1/2_type" and "kekl1/2_type_on_tape" fields */
#define TAPE390_KEKL_TYPE_NONE 0
#define TAPE390_KEKL_TYPE_LABEL 1
#define TAPE390_KEKL_TYPE_HASH 2

struct tape390_kekl {
unsigned char type;
unsigned char type_on_tape;
char label[65];
} __attribute__ ((packed));

struct tape390_kekl_pair {
struct tape390_kekl kekl[2];
} __attribute__ ((packed));

/*
* The TAPE390_KEKL_SET ioctl is used to set Key Encrypting Key labels.
*/
#define TAPE390_KEKL_SET _IOW('d', 4, struct tape390_kekl_pair)

/*
* The TAPE390_KEKL_QUERY ioctl is used to query Key Encrypting Key labels.
*/
#define TAPE390_KEKL_QUERY _IOR('d', 5, struct tape390_kekl_pair)

#endif