1/*
2 * interface to the SCLP-read/write driver
3 *
4 * Copyright IBM Corporation 1999, 2009
5 *
6 * Author(s): Martin Peschke <mpeschke@de.ibm.com>
7 *	      Martin Schwidefsky <schwidefsky@de.ibm.com>
8 */
9
10#ifndef __SCLP_RW_H__
11#define __SCLP_RW_H__
12
13#include <linux/list.h>
14
15struct mto {
16	u16 length;
17	u16 type;
18	u16 line_type_flags;
19	u8  alarm_control;
20	u8  _reserved[3];
21} __attribute__((packed));
22
23struct go {
24	u16 length;
25	u16 type;
26	u32 domid;
27	u8  hhmmss_time[8];
28	u8  th_time[3];
29	u8  reserved_0;
30	u8  dddyyyy_date[7];
31	u8  _reserved_1;
32	u16 general_msg_flags;
33	u8  _reserved_2[10];
34	u8  originating_system_name[8];
35	u8  job_guest_name[8];
36} __attribute__((packed));
37
38struct mdb_header {
39	u16 length;
40	u16 type;
41	u32 tag;
42	u32 revision_code;
43} __attribute__((packed));
44
45struct mdb {
46	struct mdb_header header;
47	struct go go;
48} __attribute__((packed));
49
50struct msg_buf {
51	struct evbuf_header header;
52	struct mdb mdb;
53} __attribute__((packed));
54
55struct write_sccb {
56	struct sccb_header header;
57	struct msg_buf msg_buf;
58} __attribute__((packed));
59
60/* The number of empty mto buffers that can be contained in a single sccb. */
61#define NR_EMPTY_MTO_PER_SCCB ((PAGE_SIZE - sizeof(struct sclp_buffer) - \
62			sizeof(struct write_sccb)) / sizeof(struct mto))
63
64/*
65 * data structure for information about list of SCCBs (only for writing),
66 * will be located at the end of a SCCBs page
67 */
68struct sclp_buffer {
69	struct list_head list;		/* list_head for sccb_info chain */
70	struct sclp_req request;
71	struct write_sccb *sccb;
72	char *current_line;
73	int current_length;
74	int retry_count;
75	/* output format settings */
76	unsigned short columns;
77	unsigned short htab;
78	/* statistics about this buffer */
79	unsigned int mto_char_sum;	/* # chars in sccb */
80	unsigned int mto_number;	/* # mtos in sccb */
81	/* Callback that is called after reaching final status. */
82	void (*callback)(struct sclp_buffer *, int);
83};
84
85int sclp_rw_init(void);
86struct sclp_buffer *sclp_make_buffer(void *, unsigned short, unsigned short);
87void *sclp_unmake_buffer(struct sclp_buffer *);
88int sclp_buffer_space(struct sclp_buffer *);
89int sclp_write(struct sclp_buffer *buffer, const unsigned char *, int);
90int sclp_emit_buffer(struct sclp_buffer *,void (*)(struct sclp_buffer *,int));
91void sclp_set_columns(struct sclp_buffer *, unsigned short);
92void sclp_set_htab(struct sclp_buffer *, unsigned short);
93int sclp_chars_in_buffer(struct sclp_buffer *);
94
95#ifdef CONFIG_SCLP_CONSOLE
96void sclp_console_pm_event(enum sclp_pm_event sclp_pm_event);
97#else
98static inline void sclp_console_pm_event(enum sclp_pm_event sclp_pm_event) { }
99#endif
100
101#endif	/* __SCLP_RW_H__ */
102