cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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vmur.h (3104B)

      1/* SPDX-License-Identifier: GPL-2.0 */
      2/*
      3 * Linux driver for System z and s390 unit record devices
      4 * (z/VM virtual punch, reader, printer)
      5 *
      6 * Copyright IBM Corp. 2001, 2007
      7 * Authors: Malcolm Beattie <beattiem@uk.ibm.com>
      8 *	    Michael Holzheu <holzheu@de.ibm.com>
      9 *	    Frank Munzert <munzert@de.ibm.com>
     10 */
     11
     12#ifndef _VMUR_H_
     13#define _VMUR_H_
     14
     15#include <linux/refcount.h>
     16
     17#define DEV_CLASS_UR_I 0x20 /* diag210 unit record input device class */
     18#define DEV_CLASS_UR_O 0x10 /* diag210 unit record output device class */
     19/*
     20 * we only support z/VM's default unit record devices:
     21 * both in SPOOL directory control statement and in CP DEFINE statement
     22 *	RDR defaults to 2540 reader
     23 *	PUN defaults to 2540 punch
     24 *	PRT defaults to 1403 printer
     25 */
     26#define READER_PUNCH_DEVTYPE	0x2540
     27#define PRINTER_DEVTYPE		0x1403
     28
     29/* z/VM spool file control block SFBLOK */
     30struct file_control_block {
     31	char reserved_1[8];
     32	char user_owner[8];
     33	char user_orig[8];
     34	__s32 data_recs;
     35	__s16 rec_len;
     36	__s16 file_num;
     37	__u8  file_stat;
     38	__u8  dev_type;
     39	char  reserved_2[6];
     40	char  file_name[12];
     41	char  file_type[12];
     42	char  create_date[8];
     43	char  create_time[8];
     44	char  reserved_3[6];
     45	__u8  file_class;
     46	__u8  sfb_lok;
     47	__u64 distr_code;
     48	__u32 reserved_4;
     49	__u8  current_starting_copy_number;
     50	__u8  sfblock_cntrl_flags;
     51	__u8  reserved_5;
     52	__u8  more_status_flags;
     53	char  rest[200];
     54} __attribute__ ((packed));
     55
     56#define FLG_SYSTEM_HOLD	0x04
     57#define FLG_CP_DUMP	0x10
     58#define FLG_USER_HOLD	0x20
     59#define FLG_IN_USE	0x80
     60
     61/*
     62 * A struct urdev is created for each ur device that is made available
     63 * via the ccw_device driver model.
     64 */
     65struct urdev {
     66	struct ccw_device *cdev;	/* Backpointer to ccw device */
     67	struct mutex io_mutex;		/* Serialises device IO */
     68	struct completion *io_done;	/* do_ur_io waits; irq completes */
     69	struct device *device;
     70	struct cdev *char_device;
     71	struct ccw_dev_id dev_id;	/* device id */
     72	size_t reclen;			/* Record length for *write* CCWs */
     73	int class;			/* VM device class */
     74	int io_request_rc;		/* return code from I/O request */
     75	refcount_t ref_count;		/* reference counter */
     76	wait_queue_head_t wait;		/* wait queue to serialize open */
     77	int open_flag;			/* "urdev is open" flag */
     78	spinlock_t open_lock;		/* serialize critical sections */
     79};
     80
     81/*
     82 * A struct urfile is allocated at open() time for each device and
     83 * freed on release().
     84 */
     85struct urfile {
     86	struct urdev *urd;
     87	unsigned int flags;
     88	size_t dev_reclen;
     89	__u16 file_reclen;
     90};
     91
     92/*
     93 * Device major/minor definitions.
     94 */
     95
     96#define UR_MAJOR 0	/* get dynamic major */
     97/*
     98 * We map minor numbers directly to device numbers (0-FFFF) for simplicity.
     99 * This avoids having to allocate (and manage) slot numbers.
    100 */
    101#define NUM_MINORS 65536
    102
    103/* Limiting each I/O to 511 records limits chan prog to 4KB (511 r/w + 1 NOP) */
    104#define MAX_RECS_PER_IO		511
    105#define WRITE_CCW_CMD		0x01
    106
    107#define TRACE(x...) debug_sprintf_event(vmur_dbf, 1, x)
    108#define CCWDEV_CU_DI(cutype, di) \
    109		CCW_DEVICE(cutype, 0x00), .driver_info = (di)
    110
    111#define FILE_RECLEN_OFFSET	4064 /* reclen offset in spool data block */
    112
    113#endif /* _VMUR_H_ */