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sclp_rw.h
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1 /*
2  * interface to the SCLP-read/write driver
3  *
4  * Copyright IBM Corporation 1999, 2009
5  *
6  * Author(s): Martin Peschke <[email protected]>
7  * Martin Schwidefsky <[email protected]>
8  */
9 
10 #ifndef __SCLP_RW_H__
11 #define __SCLP_RW_H__
12 
13 #include <linux/list.h>
14 
15 struct mto {
16  u16 length;
17  u16 type;
18  u16 line_type_flags;
19  u8 alarm_control;
20  u8 _reserved[3];
21 } __attribute__((packed));
22 
23 struct 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 
38 struct mdb_header {
39  u16 length;
40  u16 type;
41  u32 tag;
42  u32 revision_code;
43 } __attribute__((packed));
44 
45 struct mdb {
46  struct mdb_header header;
47  struct go go;
48 } __attribute__((packed));
49 
50 struct msg_buf {
51  struct evbuf_header header;
52  struct mdb mdb;
53 } __attribute__((packed));
54 
55 struct 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  */
68 struct 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 
85 int sclp_rw_init(void);
86 struct sclp_buffer *sclp_make_buffer(void *, unsigned short, unsigned short);
87 void *sclp_unmake_buffer(struct sclp_buffer *);
88 int sclp_buffer_space(struct sclp_buffer *);
89 int sclp_write(struct sclp_buffer *buffer, const unsigned char *, int);
90 int sclp_emit_buffer(struct sclp_buffer *,void (*)(struct sclp_buffer *,int));
91 void sclp_set_columns(struct sclp_buffer *, unsigned short);
92 void sclp_set_htab(struct sclp_buffer *, unsigned short);
93 int sclp_chars_in_buffer(struct sclp_buffer *);
94 
95 #ifdef CONFIG_SCLP_CONSOLE
96 void sclp_console_pm_event(enum sclp_pm_event sclp_pm_event);
97 #else
98 static inline void sclp_console_pm_event(enum sclp_pm_event sclp_pm_event) { }
99 #endif
100 
101 #endif /* __SCLP_RW_H__ */
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