/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
/*************************************************************************
*
* enables user programs to display messages and control encryption
* on s390 tape devices
*
* Copyright IBM Corp . 2001 , 2006
* Author ( s ) : Michael Holzheu < holzheu @ de . ibm . com >
*
*************************************************************************/
#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 0 x01
#define TAPE390_CRYPT_SUPPORTED(x) \
((x.capability & TAPE390_CRYPT_SUPPORTED_MASK))
/* Macros for "status" field */
#define TAPE390_CRYPT_ON_MASK 0 x01
#define TAPE390_CRYPT_ON(x) (((x.status) & TAPE390_CRYPT_ON_MASK))
/* Macros for "medium status" field */
#define TAPE390_MEDIUM_LOADED_MASK 0 x01
#define TAPE390_MEDIUM_ENCRYPTED_MASK 0 x02
#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
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(vorverarbeitet am 2026-09-27)
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