1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * interface to the SCLP-read/write driver
4 *
5 * Copyright IBM Corporation 1999, 2009
6 *
7 * Author(s): Martin Peschke <mpeschke@de.ibm.com>
8 *	      Martin Schwidefsky <schwidefsky@de.ibm.com>
9 */
10
11#ifndef __SCLP_RW_H__
12#define __SCLP_RW_H__
13
14#include <linux/list.h>
15
16struct mto {
17	u16 length;
18	u16 type;
19	u16 line_type_flags;
20	u8  alarm_control;
21	u8  _reserved[3];
22} __attribute__((packed));
23
24struct go {
25	u16 length;
26	u16 type;
27	u32 domid;
28	u8  hhmmss_time[8];
29	u8  th_time[3];
30	u8  reserved_0;
31	u8  dddyyyy_date[7];
32	u8  _reserved_1;
33	u16 general_msg_flags;
34	u8  _reserved_2[10];
35	u8  originating_system_name[8];
36	u8  job_guest_name[8];
37} __attribute__((packed));
38
39struct mdb_header {
40	u16 length;
41	u16 type;
42	u32 tag;
43	u32 revision_code;
44} __attribute__((packed));
45
46struct mdb {
47	struct mdb_header header;
48	struct go go;
49	struct mto mto;
50} __attribute__((packed));
51
52struct msg_buf {
53	struct evbuf_header header;
54	struct mdb mdb;
55} __attribute__((packed));
56
57/* The number of empty mto buffers that can be contained in a single sccb. */
58#define NR_EMPTY_MSG_PER_SCCB ((PAGE_SIZE - sizeof(struct sclp_buffer) - \
59			sizeof(struct sccb_header)) / sizeof(struct msg_buf))
60
61/*
62 * data structure for information about list of SCCBs (only for writing),
63 * will be located at the end of a SCCBs page
64 */
65struct sclp_buffer {
66	struct list_head list;		/* list_head for sccb_info chain */
67	struct sclp_req request;
68	void *sccb;
69	struct msg_buf *current_msg;
70	char *current_line;
71	int current_length;
72	int retry_count;
73	/* output format settings */
74	unsigned short columns;
75	unsigned short htab;
76	/* statistics about this buffer */
77	unsigned int char_sum;		/* # chars in sccb */
78	unsigned int messages;		/* # messages in sccb */
79	/* Callback that is called after reaching final status. */
80	void (*callback)(struct sclp_buffer *, int);
81};
82
83int sclp_rw_init(void);
84struct sclp_buffer *sclp_make_buffer(void *, unsigned short, unsigned short);
85void *sclp_unmake_buffer(struct sclp_buffer *);
86int sclp_buffer_space(struct sclp_buffer *);
87int sclp_write(struct sclp_buffer *buffer, const unsigned char *, int);
88int sclp_emit_buffer(struct sclp_buffer *,void (*)(struct sclp_buffer *,int));
89unsigned int sclp_chars_in_buffer(struct sclp_buffer *);
90
91#endif	/* __SCLP_RW_H__ */
92