| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * drivers/s390/char/sclp_rw.h |
| 3 | * interface to the SCLP-read/write driver |
| 4 | * |
| 5 | * S390 version |
| 6 | * Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation |
| 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 mdb_header { |
| 40 | u16 length; |
| 41 | u16 type; |
| 42 | u32 tag; |
| 43 | u32 revision_code; |
| 44 | } __attribute__((packed)); |
| 45 | |
| 46 | struct mdb { |
| 47 | struct mdb_header header; |
| 48 | struct go go; |
| 49 | } __attribute__((packed)); |
| 50 | |
| 51 | struct msg_buf { |
| 52 | struct evbuf_header header; |
| 53 | struct mdb mdb; |
| 54 | } __attribute__((packed)); |
| 55 | |
| 56 | struct write_sccb { |
| 57 | struct sccb_header header; |
| 58 | struct msg_buf msg_buf; |
| 59 | } __attribute__((packed)); |
| 60 | |
| 61 | /* The number of empty mto buffers that can be contained in a single sccb. */ |
| 62 | #define NR_EMPTY_MTO_PER_SCCB ((PAGE_SIZE - sizeof(struct sclp_buffer) - \ |
| 63 | sizeof(struct write_sccb)) / sizeof(struct mto)) |
| 64 | |
| 65 | /* |
| 66 | * data structure for information about list of SCCBs (only for writing), |
| 67 | * will be located at the end of a SCCBs page |
| 68 | */ |
| 69 | struct sclp_buffer { |
| 70 | struct list_head list; /* list_head for sccb_info chain */ |
| 71 | struct sclp_req request; |
| 72 | struct write_sccb *sccb; |
| 73 | char *current_line; |
| 74 | int current_length; |
| 75 | int retry_count; |
| 76 | /* output format settings */ |
| 77 | unsigned short columns; |
| 78 | unsigned short htab; |
| 79 | /* statistics about this buffer */ |
| 80 | unsigned int mto_char_sum; /* # chars in sccb */ |
| 81 | unsigned int mto_number; /* # mtos in sccb */ |
| 82 | /* Callback that is called after reaching final status. */ |
| 83 | void (*callback)(struct sclp_buffer *, int); |
| 84 | }; |
| 85 | |
| 86 | int sclp_rw_init(void); |
| 87 | struct sclp_buffer *sclp_make_buffer(void *, unsigned short, unsigned short); |
| 88 | void *sclp_unmake_buffer(struct sclp_buffer *); |
| 89 | int sclp_buffer_space(struct sclp_buffer *); |
| 90 | int sclp_write(struct sclp_buffer *buffer, const unsigned char *, int); |
| 91 | int sclp_emit_buffer(struct sclp_buffer *,void (*)(struct sclp_buffer *,int)); |
| 92 | void sclp_set_columns(struct sclp_buffer *, unsigned short); |
| 93 | void sclp_set_htab(struct sclp_buffer *, unsigned short); |
| 94 | int sclp_chars_in_buffer(struct sclp_buffer *); |
| 95 | |
| 96 | #endif /* __SCLP_RW_H__ */ |