cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

tape390.h (2830B)

      1/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
      2/*************************************************************************
      3 *
      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
     33typedef 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
     43struct 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
     83struct tape390_kekl {
     84	unsigned char type;
     85	unsigned char type_on_tape;
     86	char label[65];
     87} __attribute__ ((packed));
     88
     89struct 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