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 | |
16 | struct mto { |
17 | u16 length; |
18 | u16 type; |
19 | u16 line_type_flags; |
20 | u8 alarm_control; |
21 | u8 _reserved[3]; |
22 | } __attribute__((packed)); |
23 | |
24 | struct 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 | |
39 | struct { |
40 | u16 ; |
41 | u16 ; |
42 | u32 ; |
43 | u32 ; |
44 | } __attribute__((packed)); |
45 | |
46 | struct mdb { |
47 | struct mdb_header ; |
48 | struct go go; |
49 | struct mto mto; |
50 | } __attribute__((packed)); |
51 | |
52 | struct msg_buf { |
53 | struct evbuf_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 | */ |
65 | struct 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 | |
83 | int sclp_rw_init(void); |
84 | struct sclp_buffer *sclp_make_buffer(void *, unsigned short, unsigned short); |
85 | void *sclp_unmake_buffer(struct sclp_buffer *); |
86 | int sclp_buffer_space(struct sclp_buffer *); |
87 | int sclp_write(struct sclp_buffer *buffer, const unsigned char *, int); |
88 | int sclp_emit_buffer(struct sclp_buffer *,void (*)(struct sclp_buffer *,int)); |
89 | unsigned int sclp_chars_in_buffer(struct sclp_buffer *); |
90 | |
91 | #endif /* __SCLP_RW_H__ */ |
92 | |